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apache / nifi-minifi-cpp / 8958496bf785f37311fb383055276d5e8518b6da / . / thirdparty / civetweb-1.9.1 / src / third_party / duktape-1.5.2 / src-separate / duk_js_executor.c
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/*
* Ecmascript bytecode executor.
*/
#include "duk_internal.h"
/*
* Local declarations.
*/
DUK_LOCAL_DECL void duk__js_execute_bytecode_inner(duk_hthread *entry_thread, duk_size_t entry_callstack_top);
/*
* Arithmetic, binary, and logical helpers.
*
* Note: there is no opcode for logical AND or logical OR; this is on
* purpose, because the evalution order semantics for them make such
* opcodes pretty pointless: short circuiting means they are most
* comfortably implemented as jumps. However, a logical NOT opcode
* is useful.
*
* Note: careful with duk_tval pointers here: they are potentially
* invalidated by any DECREF and almost any API call. It's still
* preferable to work without making a copy but that's not always
* possible.
*/
DUK_LOCAL duk_double_t duk__compute_mod(duk_double_t d1, duk_double_t d2) {
/*
* Ecmascript modulus ('%') does not match IEEE 754 "remainder"
* operation (implemented by remainder() in C99) but does seem
* to match ANSI C fmod().
*
* Compare E5 Section 11.5.3 and "man fmod".
*/
return (duk_double_t) DUK_FMOD((double) d1, (double) d2);
}
DUK_LOCAL void duk__vm_arith_add(duk_hthread *thr, duk_tval *tv_x, duk_tval *tv_y, duk_small_uint_fast_t idx_z) {
/*
* Addition operator is different from other arithmetic
* operations in that it also provides string concatenation.
* Hence it is implemented separately.
*
* There is a fast path for number addition. Other cases go
* through potentially multiple coercions as described in the
* E5 specification. It may be possible to reduce the number
* of coercions, but this must be done carefully to preserve
* the exact semantics.
*
* E5 Section 11.6.1.
*
* Custom types also have special behavior implemented here.
*/
duk_context *ctx = (duk_context *) thr;
duk_double_union du;
DUK_ASSERT(thr != NULL);
DUK_ASSERT(ctx != NULL);
DUK_ASSERT(tv_x != NULL); /* may be reg or const */
DUK_ASSERT(tv_y != NULL); /* may be reg or const */
DUK_ASSERT_DISABLE(idx_z >= 0); /* unsigned */
DUK_ASSERT((duk_uint_t) idx_z < (duk_uint_t) duk_get_top(ctx));
/*
* Fast paths
*/
#if defined(DUK_USE_FASTINT)
if (DUK_TVAL_IS_FASTINT(tv_x) && DUK_TVAL_IS_FASTINT(tv_y)) {
duk_int64_t v1, v2, v3;
duk_int32_t v3_hi;
duk_tval *tv_z;
/* Input values are signed 48-bit so we can detect overflow
* reliably from high bits or just a comparison.
*/
v1 = DUK_TVAL_GET_FASTINT(tv_x);
v2 = DUK_TVAL_GET_FASTINT(tv_y);
v3 = v1 + v2;
v3_hi = (duk_int32_t) (v3 >> 32);
if (DUK_LIKELY(v3_hi >= -0x8000LL && v3_hi <= 0x7fffLL)) {
tv_z = thr->valstack_bottom + idx_z;
DUK_TVAL_SET_FASTINT_UPDREF(thr, tv_z, v3); /* side effects */
return;
} else {
/* overflow, fall through */
;
}
}
#endif /* DUK_USE_FASTINT */
if (DUK_TVAL_IS_NUMBER(tv_x) && DUK_TVAL_IS_NUMBER(tv_y)) {
duk_tval *tv_z;
du.d = DUK_TVAL_GET_NUMBER(tv_x) + DUK_TVAL_GET_NUMBER(tv_y);
DUK_DBLUNION_NORMALIZE_NAN_CHECK(&du);
DUK_ASSERT(DUK_DBLUNION_IS_NORMALIZED(&du));
tv_z = thr->valstack_bottom + idx_z;
DUK_TVAL_SET_NUMBER_UPDREF(thr, tv_z, du.d); /* side effects */
return;
}
/*
* Slow path: potentially requires function calls for coercion
*/
duk_push_tval(ctx, tv_x);
duk_push_tval(ctx, tv_y);
duk_to_primitive(ctx, -2, DUK_HINT_NONE); /* side effects -> don't use tv_x, tv_y after */
duk_to_primitive(ctx, -1, DUK_HINT_NONE);
/* As a first approximation, buffer values are coerced to strings
* for addition. This means that adding two buffers currently
* results in a string.
*/
if (duk_check_type_mask(ctx, -2, DUK_TYPE_MASK_STRING | DUK_TYPE_MASK_BUFFER) ||
duk_check_type_mask(ctx, -1, DUK_TYPE_MASK_STRING | DUK_TYPE_MASK_BUFFER)) {
duk_to_string(ctx, -2);
duk_to_string(ctx, -1);
duk_concat(ctx, 2); /* [... s1 s2] -> [... s1+s2] */
duk_replace(ctx, (duk_idx_t) idx_z); /* side effects */
} else {
duk_double_t d1, d2;
d1 = duk_to_number(ctx, -2);
d2 = duk_to_number(ctx, -1);
DUK_ASSERT(duk_is_number(ctx, -2));
DUK_ASSERT(duk_is_number(ctx, -1));
DUK_ASSERT_DOUBLE_IS_NORMALIZED(d1);
DUK_ASSERT_DOUBLE_IS_NORMALIZED(d2);
du.d = d1 + d2;
DUK_DBLUNION_NORMALIZE_NAN_CHECK(&du);
DUK_ASSERT(DUK_DBLUNION_IS_NORMALIZED(&du));
duk_pop_2(ctx);
duk_push_number(ctx, du.d);
duk_replace(ctx, (duk_idx_t) idx_z); /* side effects */
}
}
DUK_LOCAL void duk__vm_arith_binary_op(duk_hthread *thr, duk_tval *tv_x, duk_tval *tv_y, duk_idx_t idx_z, duk_small_uint_fast_t opcode) {
/*
* Arithmetic operations other than '+' have number-only semantics
* and are implemented here. The separate switch-case here means a
* "double dispatch" of the arithmetic opcode, but saves code space.
*
* E5 Sections 11.5, 11.5.1, 11.5.2, 11.5.3, 11.6, 11.6.1, 11.6.2, 11.6.3.
*/
duk_context *ctx = (duk_context *) thr;
duk_tval *tv_z;
duk_double_t d1, d2;
duk_double_union du;
DUK_ASSERT(thr != NULL);
DUK_ASSERT(ctx != NULL);
DUK_ASSERT(tv_x != NULL); /* may be reg or const */
DUK_ASSERT(tv_y != NULL); /* may be reg or const */
DUK_ASSERT_DISABLE(idx_z >= 0); /* unsigned */
DUK_ASSERT((duk_uint_t) idx_z < (duk_uint_t) duk_get_top(ctx));
#if defined(DUK_USE_FASTINT)
if (DUK_TVAL_IS_FASTINT(tv_x) && DUK_TVAL_IS_FASTINT(tv_y)) {
duk_int64_t v1, v2, v3;
duk_int32_t v3_hi;
v1 = DUK_TVAL_GET_FASTINT(tv_x);
v2 = DUK_TVAL_GET_FASTINT(tv_y);
switch (opcode) {
case DUK_OP_SUB: {
v3 = v1 - v2;
break;
}
case DUK_OP_MUL: {
/* Must ensure result is 64-bit (no overflow); a
* simple and sufficient fast path is to allow only
* 32-bit inputs. Avoid zero inputs to avoid
* negative zero issues (-1 * 0 = -0, for instance).
*/
if (v1 >= -0x80000000LL && v1 <= 0x7fffffffLL && v1 != 0 &&
v2 >= -0x80000000LL && v2 <= 0x7fffffffLL && v2 != 0) {
v3 = v1 * v2;
} else {
goto skip_fastint;
}
break;
}
case DUK_OP_DIV: {
/* Don't allow a zero divisor. Fast path check by
* "verifying" with multiplication. Also avoid zero
* dividend to avoid negative zero issues (0 / -1 = -0
* for instance).
*/
if (v1 == 0 || v2 == 0) {
goto skip_fastint;
}
v3 = v1 / v2;
if (v3 * v2 != v1) {
goto skip_fastint;
}
break;
}
case DUK_OP_MOD: {
/* Don't allow a zero divisor. Restrict both v1 and
* v2 to positive values to avoid compiler specific
* behavior.
*/
if (v1 < 1 || v2 < 1) {
goto skip_fastint;
}
v3 = v1 % v2;
DUK_ASSERT(v3 >= 0);
DUK_ASSERT(v3 < v2);
DUK_ASSERT(v1 - (v1 / v2) * v2 == v3);
break;
}
default: {
DUK_UNREACHABLE();
goto skip_fastint;
}
}
v3_hi = (duk_int32_t) (v3 >> 32);
if (DUK_LIKELY(v3_hi >= -0x8000LL && v3_hi <= 0x7fffLL)) {
tv_z = thr->valstack_bottom + idx_z;
DUK_TVAL_SET_FASTINT_UPDREF(thr, tv_z, v3); /* side effects */
return;
}
/* fall through if overflow etc */
}
skip_fastint:
#endif /* DUK_USE_FASTINT */
if (DUK_TVAL_IS_NUMBER(tv_x) && DUK_TVAL_IS_NUMBER(tv_y)) {
/* fast path */
d1 = DUK_TVAL_GET_NUMBER(tv_x);
d2 = DUK_TVAL_GET_NUMBER(tv_y);
} else {
duk_push_tval(ctx, tv_x);
duk_push_tval(ctx, tv_y);
d1 = duk_to_number(ctx, -2); /* side effects */
d2 = duk_to_number(ctx, -1);
DUK_ASSERT(duk_is_number(ctx, -2));
DUK_ASSERT(duk_is_number(ctx, -1));
DUK_ASSERT_DOUBLE_IS_NORMALIZED(d1);
DUK_ASSERT_DOUBLE_IS_NORMALIZED(d2);
duk_pop_2(ctx);
}
switch (opcode) {
case DUK_OP_SUB: {
du.d = d1 - d2;
break;
}
case DUK_OP_MUL: {
du.d = d1 * d2;
break;
}
case DUK_OP_DIV: {
du.d = d1 / d2;
break;
}
case DUK_OP_MOD: {
du.d = duk__compute_mod(d1, d2);
break;
}
default: {
DUK_UNREACHABLE();
du.d = DUK_DOUBLE_NAN; /* should not happen */
break;
}
}
/* important to use normalized NaN with 8-byte tagged types */
DUK_DBLUNION_NORMALIZE_NAN_CHECK(&du);
DUK_ASSERT(DUK_DBLUNION_IS_NORMALIZED(&du));
tv_z = thr->valstack_bottom + idx_z;
DUK_TVAL_SET_NUMBER_UPDREF(thr, tv_z, du.d); /* side effects */
}
DUK_LOCAL void duk__vm_bitwise_binary_op(duk_hthread *thr, duk_tval *tv_x, duk_tval *tv_y, duk_small_uint_fast_t idx_z, duk_small_uint_fast_t opcode) {
/*
* Binary bitwise operations use different coercions (ToInt32, ToUint32)
* depending on the operation. We coerce the arguments first using
* ToInt32(), and then cast to an 32-bit value if necessary. Note that
* such casts must be correct even if there is no native 32-bit type
* (e.g., duk_int32_t and duk_uint32_t are 64-bit).
*
* E5 Sections 11.10, 11.7.1, 11.7.2, 11.7.3
*/
duk_context *ctx = (duk_context *) thr;
duk_tval *tv_z;
duk_int32_t i1, i2, i3;
duk_uint32_t u1, u2, u3;
#if defined(DUK_USE_FASTINT)
duk_int64_t fi3;
#else
duk_double_t d3;
#endif
DUK_ASSERT(thr != NULL);
DUK_ASSERT(ctx != NULL);
DUK_ASSERT(tv_x != NULL); /* may be reg or const */
DUK_ASSERT(tv_y != NULL); /* may be reg or const */
DUK_ASSERT_DISABLE(idx_z >= 0); /* unsigned */
DUK_ASSERT((duk_uint_t) idx_z < (duk_uint_t) duk_get_top(ctx));
#if defined(DUK_USE_FASTINT)
if (DUK_TVAL_IS_FASTINT(tv_x) && DUK_TVAL_IS_FASTINT(tv_y)) {
i1 = (duk_int32_t) DUK_TVAL_GET_FASTINT_I32(tv_x);
i2 = (duk_int32_t) DUK_TVAL_GET_FASTINT_I32(tv_y);
}
else
#endif /* DUK_USE_FASTINT */
{
duk_push_tval(ctx, tv_x);
duk_push_tval(ctx, tv_y);
i1 = duk_to_int32(ctx, -2);
i2 = duk_to_int32(ctx, -1);
duk_pop_2(ctx);
}
switch (opcode) {
case DUK_OP_BAND: {
i3 = i1 & i2;
break;
}
case DUK_OP_BOR: {
i3 = i1 | i2;
break;
}
case DUK_OP_BXOR: {
i3 = i1 ^ i2;
break;
}
case DUK_OP_BASL: {
/* Signed shift, named "arithmetic" (asl) because the result
* is signed, e.g. 4294967295 << 1 -> -2. Note that result
* must be masked.
*/
u2 = ((duk_uint32_t) i2) & 0xffffffffUL;
i3 = i1 << (u2 & 0x1f); /* E5 Section 11.7.1, steps 7 and 8 */
i3 = i3 & ((duk_int32_t) 0xffffffffUL); /* Note: left shift, should mask */
break;
}
case DUK_OP_BASR: {
/* signed shift */
u2 = ((duk_uint32_t) i2) & 0xffffffffUL;
i3 = i1 >> (u2 & 0x1f); /* E5 Section 11.7.2, steps 7 and 8 */
break;
}
case DUK_OP_BLSR: {
/* unsigned shift */
u1 = ((duk_uint32_t) i1) & 0xffffffffUL;
u2 = ((duk_uint32_t) i2) & 0xffffffffUL;
/* special result value handling */
u3 = u1 >> (u2 & 0x1f); /* E5 Section 11.7.2, steps 7 and 8 */
#if defined(DUK_USE_FASTINT)
fi3 = (duk_int64_t) u3;
goto fastint_result_set;
#else
d3 = (duk_double_t) u3;
goto result_set;
#endif
}
default: {
DUK_UNREACHABLE();
i3 = 0; /* should not happen */
break;
}
}
#if defined(DUK_USE_FASTINT)
/* Result is always fastint compatible. */
/* XXX: Set 32-bit result (but must then handle signed and
* unsigned results separately).
*/
fi3 = (duk_int64_t) i3;
fastint_result_set:
tv_z = thr->valstack_bottom + idx_z;
DUK_TVAL_SET_FASTINT_UPDREF(thr, tv_z, fi3); /* side effects */
#else
d3 = (duk_double_t) i3;
result_set:
DUK_ASSERT(!DUK_ISNAN(d3)); /* 'd3' is never NaN, so no need to normalize */
DUK_ASSERT_DOUBLE_IS_NORMALIZED(d3); /* always normalized */
tv_z = thr->valstack_bottom + idx_z;
DUK_TVAL_SET_NUMBER_UPDREF(thr, tv_z, d3); /* side effects */
#endif
}
/* In-place unary operation. */
DUK_LOCAL void duk__vm_arith_unary_op(duk_hthread *thr, duk_tval *tv_x, duk_idx_t idx_x, duk_small_uint_fast_t opcode) {
/*
* Arithmetic operations other than '+' have number-only semantics
* and are implemented here. The separate switch-case here means a
* "double dispatch" of the arithmetic opcode, but saves code space.
*
* E5 Sections 11.5, 11.5.1, 11.5.2, 11.5.3, 11.6, 11.6.1, 11.6.2, 11.6.3.
*/
duk_context *ctx = (duk_context *) thr;
duk_double_t d1;
duk_double_union du;
DUK_ASSERT(thr != NULL);
DUK_ASSERT(ctx != NULL);
DUK_ASSERT(opcode == DUK_EXTRAOP_UNM || opcode == DUK_EXTRAOP_UNP);
DUK_ASSERT(tv_x != NULL);
DUK_ASSERT(idx_x >= 0);
#if defined(DUK_USE_FASTINT)
if (DUK_TVAL_IS_FASTINT(tv_x)) {
duk_int64_t v1, v2;
v1 = DUK_TVAL_GET_FASTINT(tv_x);
if (opcode == DUK_EXTRAOP_UNM) {
/* The smallest fastint is no longer 48-bit when
* negated. Positive zero becames negative zero
* (cannot be represented) when negated.
*/
if (DUK_LIKELY(v1 != DUK_FASTINT_MIN && v1 != 0)) {
v2 = -v1;
DUK_TVAL_SET_FASTINT(tv_x, v2); /* no refcount changes */
return;
}
} else {
/* ToNumber() for a fastint is a no-op. */
DUK_ASSERT(opcode == DUK_EXTRAOP_UNP);
return;
}
/* fall through if overflow etc */
}
#endif /* DUK_USE_FASTINT */
if (!DUK_TVAL_IS_NUMBER(tv_x)) {
duk_to_number(ctx, idx_x); /* side effects, perform in-place */
tv_x = DUK_GET_TVAL_POSIDX(ctx, idx_x);
DUK_ASSERT(tv_x != NULL);
DUK_ASSERT(DUK_TVAL_IS_NUMBER(tv_x));
}
d1 = DUK_TVAL_GET_NUMBER(tv_x);
if (opcode == DUK_EXTRAOP_UNM) {
du.d = -d1;
} else {
/* ToNumber() for a double is a no-op. */
DUK_ASSERT(opcode == DUK_EXTRAOP_UNP);
du.d = d1;
}
DUK_DBLUNION_NORMALIZE_NAN_CHECK(&du); /* mandatory if du.d is a NaN */
DUK_ASSERT(DUK_DBLUNION_IS_NORMALIZED(&du));
#if defined(DUK_USE_FASTINT)
/* Unary plus is used to force a fastint check, so must include
* downgrade check.
*/
DUK_TVAL_SET_NUMBER_CHKFAST(tv_x, du.d); /* no refcount changes */
#else
DUK_TVAL_SET_NUMBER(tv_x, du.d); /* no refcount changes */
#endif
}
DUK_LOCAL void duk__vm_bitwise_not(duk_hthread *thr, duk_tval *tv_x, duk_uint_fast_t idx_z) {
/*
* E5 Section 11.4.8
*/
duk_context *ctx = (duk_context *) thr;
duk_tval *tv_z;
duk_int32_t i1, i2;
#if !defined(DUK_USE_FASTINT)
duk_double_t d2;
#endif
DUK_ASSERT(thr != NULL);
DUK_ASSERT(ctx != NULL);
DUK_ASSERT(tv_x != NULL); /* may be reg or const */
DUK_ASSERT_DISABLE(idx_z >= 0);
DUK_ASSERT((duk_uint_t) idx_z < (duk_uint_t) duk_get_top(ctx));
#if defined(DUK_USE_FASTINT)
if (DUK_TVAL_IS_FASTINT(tv_x)) {
i1 = (duk_int32_t) DUK_TVAL_GET_FASTINT_I32(tv_x);
}
else
#endif /* DUK_USE_FASTINT */
{
duk_push_tval(ctx, tv_x);
i1 = duk_to_int32(ctx, -1);
duk_pop(ctx);
}
i2 = ~i1;
#if defined(DUK_USE_FASTINT)
/* Result is always fastint compatible. */
tv_z = thr->valstack_bottom + idx_z;
DUK_TVAL_SET_FASTINT_I32_UPDREF(thr, tv_z, i2); /* side effects */
#else
d2 = (duk_double_t) i2;
DUK_ASSERT(!DUK_ISNAN(d2)); /* 'val' is never NaN, so no need to normalize */
DUK_ASSERT_DOUBLE_IS_NORMALIZED(d2); /* always normalized */
tv_z = thr->valstack_bottom + idx_z;
DUK_TVAL_SET_NUMBER_UPDREF(thr, tv_z, d2); /* side effects */
#endif
}
DUK_LOCAL void duk__vm_logical_not(duk_hthread *thr, duk_tval *tv_x, duk_tval *tv_z) {
/*
* E5 Section 11.4.9
*/
duk_bool_t res;
DUK_ASSERT(thr != NULL);
DUK_ASSERT(tv_x != NULL); /* may be reg or const */
DUK_ASSERT(tv_z != NULL); /* reg */
DUK_UNREF(thr); /* w/o refcounts */
/* ToBoolean() does not require any operations with side effects so
* we can do it efficiently. For footprint it would be better to use
* duk_js_toboolean() and then push+replace to the result slot.
*/
res = duk_js_toboolean(tv_x); /* does not modify tv_x */
DUK_ASSERT(res == 0 || res == 1);
res ^= 1;
DUK_TVAL_SET_BOOLEAN_UPDREF(thr, tv_z, res); /* side effects */
}
/*
* Longjmp and other control flow transfer for the bytecode executor.
*
* The longjmp handler can handle all longjmp types: error, yield, and
* resume (pseudotypes are never actually thrown).
*
* Error policy for longjmp: should not ordinarily throw errors; if errors
* occur (e.g. due to out-of-memory) they bubble outwards rather than being
* handled recursively.
*/
#define DUK__LONGJMP_RESTART 0 /* state updated, restart bytecode execution */
#define DUK__LONGJMP_RETHROW 1 /* exit bytecode executor by rethrowing an error to caller */
#define DUK__RETHAND_RESTART 0 /* state updated, restart bytecode execution */
#define DUK__RETHAND_FINISHED 1 /* exit bytecode execution with return value */
/* XXX: optimize reconfig valstack operations so that resize, clamp, and setting
* top are combined into one pass.
*/
/* Reconfigure value stack for return to an Ecmascript function at 'act_idx'. */
DUK_LOCAL void duk__reconfig_valstack_ecma_return(duk_hthread *thr, duk_size_t act_idx) {
duk_activation *act;
duk_hcompiledfunction *h_func;
duk_idx_t clamp_top;
DUK_ASSERT(thr != NULL);
DUK_ASSERT_DISABLE(act_idx >= 0); /* unsigned */
DUK_ASSERT(DUK_ACT_GET_FUNC(thr->callstack + act_idx) != NULL);
DUK_ASSERT(DUK_HOBJECT_IS_COMPILEDFUNCTION(DUK_ACT_GET_FUNC(thr->callstack + act_idx)));
DUK_ASSERT_DISABLE(thr->callstack[act_idx].idx_retval >= 0); /* unsigned */
/* Clamp so that values at 'clamp_top' and above are wiped and won't
* retain reachable garbage. Then extend to 'nregs' because we're
* returning to an Ecmascript function.
*/
act = thr->callstack + act_idx;
h_func = (duk_hcompiledfunction *) DUK_ACT_GET_FUNC(act);
thr->valstack_bottom = thr->valstack + act->idx_bottom;
DUK_ASSERT(act->idx_retval >= act->idx_bottom);
clamp_top = (duk_idx_t) (act->idx_retval - act->idx_bottom + 1); /* +1 = one retval */
duk_set_top((duk_context *) thr, clamp_top);
act = NULL;
(void) duk_valstack_resize_raw((duk_context *) thr,
(thr->valstack_bottom - thr->valstack) + /* bottom of current func */
h_func->nregs + /* reg count */
DUK_VALSTACK_INTERNAL_EXTRA, /* + spare */
DUK_VSRESIZE_FLAG_SHRINK | /* flags */
0 /* no compact */ |
DUK_VSRESIZE_FLAG_THROW);
duk_set_top((duk_context *) thr, h_func->nregs);
}
DUK_LOCAL void duk__reconfig_valstack_ecma_catcher(duk_hthread *thr, duk_size_t act_idx, duk_size_t cat_idx) {
duk_activation *act;
duk_catcher *cat;
duk_hcompiledfunction *h_func;
duk_idx_t clamp_top;
DUK_ASSERT(thr != NULL);
DUK_ASSERT_DISABLE(act_idx >= 0); /* unsigned */
DUK_ASSERT(DUK_ACT_GET_FUNC(thr->callstack + act_idx) != NULL);
DUK_ASSERT(DUK_HOBJECT_IS_COMPILEDFUNCTION(DUK_ACT_GET_FUNC(thr->callstack + act_idx)));
DUK_ASSERT_DISABLE(thr->callstack[act_idx].idx_retval >= 0); /* unsigned */
act = thr->callstack + act_idx;
cat = thr->catchstack + cat_idx;
h_func = (duk_hcompiledfunction *) DUK_ACT_GET_FUNC(act);
thr->valstack_bottom = thr->valstack + act->idx_bottom;
DUK_ASSERT(cat->idx_base >= act->idx_bottom);
clamp_top = (duk_idx_t) (cat->idx_base - act->idx_bottom + 2); /* +2 = catcher value, catcher lj_type */
duk_set_top((duk_context *) thr, clamp_top);
act = NULL;
cat = NULL;
(void) duk_valstack_resize_raw((duk_context *) thr,
(thr->valstack_bottom - thr->valstack) + /* bottom of current func */
h_func->nregs + /* reg count */
DUK_VALSTACK_INTERNAL_EXTRA, /* + spare */
DUK_VSRESIZE_FLAG_SHRINK | /* flags */
0 /* no compact */ |
DUK_VSRESIZE_FLAG_THROW);
duk_set_top((duk_context *) thr, h_func->nregs);
}
/* Set catcher regs: idx_base+0 = value, idx_base+1 = lj_type. */
DUK_LOCAL void duk__set_catcher_regs(duk_hthread *thr, duk_size_t cat_idx, duk_tval *tv_val_unstable, duk_small_uint_t lj_type) {
duk_tval *tv1;
DUK_ASSERT(thr != NULL);
DUK_ASSERT(tv_val_unstable != NULL);
tv1 = thr->valstack + thr->catchstack[cat_idx].idx_base;
DUK_ASSERT(tv1 < thr->valstack_top);
DUK_TVAL_SET_TVAL_UPDREF(thr, tv1, tv_val_unstable); /* side effects */
tv1 = thr->valstack + thr->catchstack[cat_idx].idx_base + 1;
DUK_ASSERT(tv1 < thr->valstack_top);
DUK_TVAL_SET_FASTINT_U32_UPDREF(thr, tv1, (duk_uint32_t) lj_type); /* side effects */
}
DUK_LOCAL void duk__handle_catch(duk_hthread *thr, duk_size_t cat_idx, duk_tval *tv_val_unstable, duk_small_uint_t lj_type) {
duk_context *ctx;
duk_activation *act;
DUK_ASSERT(thr != NULL);
DUK_ASSERT(tv_val_unstable != NULL);
ctx = (duk_context *) thr;
duk__set_catcher_regs(thr, cat_idx, tv_val_unstable, lj_type);
duk_hthread_catchstack_unwind(thr, cat_idx + 1);
duk_hthread_callstack_unwind(thr, thr->catchstack[cat_idx].callstack_index + 1);
DUK_ASSERT(thr->callstack_top >= 1);
DUK_ASSERT(DUK_ACT_GET_FUNC(thr->callstack + thr->callstack_top - 1) != NULL);
DUK_ASSERT(DUK_HOBJECT_IS_COMPILEDFUNCTION(DUK_ACT_GET_FUNC(thr->callstack + thr->callstack_top - 1)));
duk__reconfig_valstack_ecma_catcher(thr, thr->callstack_top - 1, cat_idx);
DUK_ASSERT(thr->callstack_top >= 1);
act = thr->callstack + thr->callstack_top - 1;
act->curr_pc = thr->catchstack[cat_idx].pc_base + 0; /* +0 = catch */
act = NULL;
/*
* If entering a 'catch' block which requires an automatic
* catch variable binding, create the lexical environment.
*
* The binding is mutable (= writable) but not deletable.
* Step 4 for the catch production in E5 Section 12.14;
* no value is given for CreateMutableBinding 'D' argument,
* which implies the binding is not deletable.
*/
if (DUK_CAT_HAS_CATCH_BINDING_ENABLED(&thr->catchstack[cat_idx])) {
duk_hobject *new_env;
duk_hobject *act_lex_env;
DUK_DDD(DUK_DDDPRINT("catcher has an automatic catch binding"));
/* Note: 'act' is dangerous here because it may get invalidate at many
* points, so we re-lookup it multiple times.
*/
DUK_ASSERT(thr->callstack_top >= 1);
act = thr->callstack + thr->callstack_top - 1;
if (act->lex_env == NULL) {
DUK_ASSERT(act->var_env == NULL);
DUK_DDD(DUK_DDDPRINT("delayed environment initialization"));
/* this may have side effects, so re-lookup act */
duk_js_init_activation_environment_records_delayed(thr, act);
act = thr->callstack + thr->callstack_top - 1;
}
DUK_ASSERT(act->lex_env != NULL);
DUK_ASSERT(act->var_env != NULL);
DUK_ASSERT(DUK_ACT_GET_FUNC(act) != NULL);
DUK_UNREF(act); /* unreferenced without assertions */
act = thr->callstack + thr->callstack_top - 1;
act_lex_env = act->lex_env;
act = NULL; /* invalidated */
(void) duk_push_object_helper_proto(ctx,
DUK_HOBJECT_FLAG_EXTENSIBLE |
DUK_HOBJECT_CLASS_AS_FLAGS(DUK_HOBJECT_CLASS_DECENV),
act_lex_env);
new_env = DUK_GET_HOBJECT_NEGIDX(ctx, -1);
DUK_ASSERT(new_env != NULL);
DUK_DDD(DUK_DDDPRINT("new_env allocated: %!iO", (duk_heaphdr *) new_env));
/* Note: currently the catch binding is handled without a register
* binding because we don't support dynamic register bindings (they
* must be fixed for an entire function). So, there is no need to
* record regbases etc.
*/
DUK_ASSERT(thr->catchstack[cat_idx].h_varname != NULL);
duk_push_hstring(ctx, thr->catchstack[cat_idx].h_varname);
duk_push_tval(ctx, thr->valstack + thr->catchstack[cat_idx].idx_base);
duk_xdef_prop(ctx, -3, DUK_PROPDESC_FLAGS_W); /* writable, not configurable */
act = thr->callstack + thr->callstack_top - 1;
act->lex_env = new_env;
DUK_HOBJECT_INCREF(thr, new_env); /* reachable through activation */
DUK_CAT_SET_LEXENV_ACTIVE(&thr->catchstack[cat_idx]);
duk_pop(ctx);
DUK_DDD(DUK_DDDPRINT("new_env finished: %!iO", (duk_heaphdr *) new_env));
}
DUK_CAT_CLEAR_CATCH_ENABLED(&thr->catchstack[cat_idx]);
}
DUK_LOCAL void duk__handle_finally(duk_hthread *thr, duk_size_t cat_idx, duk_tval *tv_val_unstable, duk_small_uint_t lj_type) {
duk_activation *act;
DUK_ASSERT(thr != NULL);
DUK_ASSERT(tv_val_unstable != NULL);
duk__set_catcher_regs(thr, cat_idx, tv_val_unstable, lj_type);
duk_hthread_catchstack_unwind(thr, cat_idx + 1); /* cat_idx catcher is kept, even for finally */
duk_hthread_callstack_unwind(thr, thr->catchstack[cat_idx].callstack_index + 1);
DUK_ASSERT(thr->callstack_top >= 1);
DUK_ASSERT(DUK_ACT_GET_FUNC(thr->callstack + thr->callstack_top - 1) != NULL);
DUK_ASSERT(DUK_HOBJECT_IS_COMPILEDFUNCTION(DUK_ACT_GET_FUNC(thr->callstack + thr->callstack_top - 1)));
duk__reconfig_valstack_ecma_catcher(thr, thr->callstack_top - 1, cat_idx);
DUK_ASSERT(thr->callstack_top >= 1);
act = thr->callstack + thr->callstack_top - 1;
act->curr_pc = thr->catchstack[cat_idx].pc_base + 1; /* +1 = finally */
act = NULL;
DUK_CAT_CLEAR_FINALLY_ENABLED(&thr->catchstack[cat_idx]);
}
DUK_LOCAL void duk__handle_label(duk_hthread *thr, duk_size_t cat_idx, duk_small_uint_t lj_type) {
duk_activation *act;
DUK_ASSERT(thr != NULL);
DUK_ASSERT(thr->callstack_top >= 1);
act = thr->callstack + thr->callstack_top - 1;
DUK_ASSERT(DUK_ACT_GET_FUNC(act) != NULL);
DUK_ASSERT(DUK_HOBJECT_HAS_COMPILEDFUNCTION(DUK_ACT_GET_FUNC(act)));
/* +0 = break, +1 = continue */
act->curr_pc = thr->catchstack[cat_idx].pc_base + (lj_type == DUK_LJ_TYPE_CONTINUE ? 1 : 0);
act = NULL; /* invalidated */
duk_hthread_catchstack_unwind(thr, cat_idx + 1); /* keep label catcher */
/* no need to unwind callstack */
/* valstack should not need changes */
#if defined(DUK_USE_ASSERTIONS)
DUK_ASSERT(thr->callstack_top >= 1);
act = thr->callstack + thr->callstack_top - 1;
DUK_ASSERT((duk_size_t) (thr->valstack_top - thr->valstack_bottom) ==
(duk_size_t) ((duk_hcompiledfunction *) DUK_ACT_GET_FUNC(act))->nregs);
#endif
}
/* Called for handling both a longjmp() with type DUK_LJ_TYPE_YIELD and
* when a RETURN opcode terminates a thread and yields to the resumer.
*/
DUK_LOCAL void duk__handle_yield(duk_hthread *thr, duk_hthread *resumer, duk_size_t act_idx, duk_tval *tv_val_unstable) {
duk_tval *tv1;
DUK_ASSERT(thr != NULL);
DUK_ASSERT(resumer != NULL);
DUK_ASSERT(tv_val_unstable != NULL);
DUK_ASSERT(DUK_ACT_GET_FUNC(resumer->callstack + act_idx) != NULL);
DUK_ASSERT(DUK_HOBJECT_IS_COMPILEDFUNCTION(DUK_ACT_GET_FUNC(resumer->callstack + act_idx))); /* resume caller must be an ecmascript func */
tv1 = resumer->valstack + resumer->callstack[act_idx].idx_retval; /* return value from Duktape.Thread.resume() */
DUK_TVAL_SET_TVAL_UPDREF(thr, tv1, tv_val_unstable); /* side effects */
duk_hthread_callstack_unwind(resumer, act_idx + 1); /* unwind to 'resume' caller */
/* no need to unwind catchstack */
duk__reconfig_valstack_ecma_return(resumer, act_idx);
/* caller must change active thread, and set thr->resumer to NULL */
}
DUK_LOCAL
duk_small_uint_t duk__handle_longjmp(duk_hthread *thr,
duk_hthread *entry_thread,
duk_size_t entry_callstack_top) {
duk_size_t entry_callstack_index;
duk_small_uint_t retval = DUK__LONGJMP_RESTART;
DUK_ASSERT(thr != NULL);
DUK_ASSERT(entry_thread != NULL);
DUK_ASSERT(entry_callstack_top > 0); /* guarantees entry_callstack_top - 1 >= 0 */
entry_callstack_index = entry_callstack_top - 1;
/* 'thr' is the current thread, as no-one resumes except us and we
* switch 'thr' in that case.
*/
DUK_ASSERT(thr == thr->heap->curr_thread);
/*
* (Re)try handling the longjmp.
*
* A longjmp handler may convert the longjmp to a different type and
* "virtually" rethrow by goto'ing to 'check_longjmp'. Before the goto,
* the following must be updated:
* - the heap 'lj' state
* - 'thr' must reflect the "throwing" thread
*/
check_longjmp:
DUK_DD(DUK_DDPRINT("handling longjmp: type=%ld, value1=%!T, value2=%!T, iserror=%ld",
(long) thr->heap->lj.type,
(duk_tval *) &thr->heap->lj.value1,
(duk_tval *) &thr->heap->lj.value2,
(long) thr->heap->lj.iserror));
switch (thr->heap->lj.type) {
case DUK_LJ_TYPE_RESUME: {
/*
* Note: lj.value1 is 'value', lj.value2 is 'resumee'.
* This differs from YIELD.
*/
duk_tval *tv;
duk_tval *tv2;
duk_size_t act_idx;
duk_hthread *resumee;
/* duk_bi_duk_object_yield() and duk_bi_duk_object_resume() ensure all of these are met */
DUK_ASSERT(thr->state == DUK_HTHREAD_STATE_RUNNING); /* unchanged by Duktape.Thread.resume() */
DUK_ASSERT(thr->callstack_top >= 2); /* Ecmascript activation + Duktape.Thread.resume() activation */
DUK_ASSERT(DUK_ACT_GET_FUNC(thr->callstack + thr->callstack_top - 1) != NULL &&
DUK_HOBJECT_IS_NATIVEFUNCTION(DUK_ACT_GET_FUNC(thr->callstack + thr->callstack_top - 1)) &&
((duk_hnativefunction *) DUK_ACT_GET_FUNC(thr->callstack + thr->callstack_top - 1))->func == duk_bi_thread_resume);
DUK_ASSERT(DUK_ACT_GET_FUNC(thr->callstack + thr->callstack_top - 2) != NULL &&
DUK_HOBJECT_IS_COMPILEDFUNCTION(DUK_ACT_GET_FUNC(thr->callstack + thr->callstack_top - 2))); /* an Ecmascript function */
DUK_ASSERT_DISABLE((thr->callstack + thr->callstack_top - 2)->idx_retval >= 0); /* unsigned */
tv = &thr->heap->lj.value2; /* resumee */
DUK_ASSERT(DUK_TVAL_IS_OBJECT(tv));
DUK_ASSERT(DUK_TVAL_GET_OBJECT(tv) != NULL);
DUK_ASSERT(DUK_HOBJECT_IS_THREAD(DUK_TVAL_GET_OBJECT(tv)));
resumee = (duk_hthread *) DUK_TVAL_GET_OBJECT(tv);
DUK_ASSERT(resumee != NULL);
DUK_ASSERT(resumee->resumer == NULL);
DUK_ASSERT(resumee->state == DUK_HTHREAD_STATE_INACTIVE ||
resumee->state == DUK_HTHREAD_STATE_YIELDED); /* checked by Duktape.Thread.resume() */
DUK_ASSERT(resumee->state != DUK_HTHREAD_STATE_YIELDED ||
resumee->callstack_top >= 2); /* YIELDED: Ecmascript activation + Duktape.Thread.yield() activation */
DUK_ASSERT(resumee->state != DUK_HTHREAD_STATE_YIELDED ||
(DUK_ACT_GET_FUNC(resumee->callstack + resumee->callstack_top - 1) != NULL &&
DUK_HOBJECT_IS_NATIVEFUNCTION(DUK_ACT_GET_FUNC(resumee->callstack + resumee->callstack_top - 1)) &&
((duk_hnativefunction *) DUK_ACT_GET_FUNC(resumee->callstack + resumee->callstack_top - 1))->func == duk_bi_thread_yield));
DUK_ASSERT(resumee->state != DUK_HTHREAD_STATE_YIELDED ||
(DUK_ACT_GET_FUNC(resumee->callstack + resumee->callstack_top - 2) != NULL &&
DUK_HOBJECT_IS_COMPILEDFUNCTION(DUK_ACT_GET_FUNC(resumee->callstack + resumee->callstack_top - 2)))); /* an Ecmascript function */
DUK_ASSERT_DISABLE(resumee->state != DUK_HTHREAD_STATE_YIELDED ||
(resumee->callstack + resumee->callstack_top - 2)->idx_retval >= 0); /* idx_retval unsigned */
DUK_ASSERT(resumee->state != DUK_HTHREAD_STATE_INACTIVE ||
resumee->callstack_top == 0); /* INACTIVE: no activation, single function value on valstack */
DUK_ASSERT(resumee->state != DUK_HTHREAD_STATE_INACTIVE ||
(resumee->valstack_top == resumee->valstack + 1 &&
DUK_TVAL_IS_OBJECT(resumee->valstack_top - 1) &&
DUK_HOBJECT_IS_COMPILEDFUNCTION(DUK_TVAL_GET_OBJECT(resumee->valstack_top - 1))));
if (thr->heap->lj.iserror) {
/*
* Throw the error in the resumed thread's context; the
* error value is pushed onto the resumee valstack.
*
* Note: the callstack of the target may empty in this case
* too (i.e. the target thread has never been resumed). The
* value stack will contain the initial function in that case,
* which we simply ignore.
*/
resumee->resumer = thr;
resumee->state = DUK_HTHREAD_STATE_RUNNING;
thr->state = DUK_HTHREAD_STATE_RESUMED;
DUK_HEAP_SWITCH_THREAD(thr->heap, resumee);
thr = resumee;
thr->heap->lj.type = DUK_LJ_TYPE_THROW;
/* thr->heap->lj.value1 is already the value to throw */
/* thr->heap->lj.value2 is 'thread', will be wiped out at the end */
DUK_ASSERT(thr->heap->lj.iserror); /* already set */
DUK_DD(DUK_DDPRINT("-> resume with an error, converted to a throw in the resumee, propagate"));
goto check_longjmp;
} else if (resumee->state == DUK_HTHREAD_STATE_YIELDED) {
act_idx = resumee->callstack_top - 2; /* Ecmascript function */
DUK_ASSERT_DISABLE(resumee->callstack[act_idx].idx_retval >= 0); /* unsigned */
tv = resumee->valstack + resumee->callstack[act_idx].idx_retval; /* return value from Duktape.Thread.yield() */
DUK_ASSERT(tv >= resumee->valstack && tv < resumee->valstack_top);
tv2 = &thr->heap->lj.value1;
DUK_TVAL_SET_TVAL_UPDREF(thr, tv, tv2); /* side effects */
duk_hthread_callstack_unwind(resumee, act_idx + 1); /* unwind to 'yield' caller */
/* no need to unwind catchstack */
duk__reconfig_valstack_ecma_return(resumee, act_idx);
resumee->resumer = thr;
resumee->state = DUK_HTHREAD_STATE_RUNNING;
thr->state = DUK_HTHREAD_STATE_RESUMED;
DUK_HEAP_SWITCH_THREAD(thr->heap, resumee);
#if 0
thr = resumee; /* not needed, as we exit right away */
#endif
DUK_DD(DUK_DDPRINT("-> resume with a value, restart execution in resumee"));
retval = DUK__LONGJMP_RESTART;
goto wipe_and_return;
} else {
duk_small_uint_t call_flags;
duk_bool_t setup_rc;
/* resumee: [... initial_func] (currently actually: [initial_func]) */
duk_push_undefined((duk_context *) resumee);
tv = &thr->heap->lj.value1;
duk_push_tval((duk_context *) resumee, tv);
/* resumee: [... initial_func undefined(= this) resume_value ] */
call_flags = DUK_CALL_FLAG_IS_RESUME; /* is resume, not a tail call */
setup_rc = duk_handle_ecma_call_setup(resumee,
1, /* num_stack_args */
call_flags); /* call_flags */
if (setup_rc == 0) {
/* Shouldn't happen but check anyway. */
DUK_ERROR_INTERNAL_DEFMSG(thr);
}
resumee->resumer = thr;
resumee->state = DUK_HTHREAD_STATE_RUNNING;
thr->state = DUK_HTHREAD_STATE_RESUMED;
DUK_HEAP_SWITCH_THREAD(thr->heap, resumee);
#if 0
thr = resumee; /* not needed, as we exit right away */
#endif
DUK_DD(DUK_DDPRINT("-> resume with a value, restart execution in resumee"));
retval = DUK__LONGJMP_RESTART;
goto wipe_and_return;
}
DUK_UNREACHABLE();
break; /* never here */
}
case DUK_LJ_TYPE_YIELD: {
/*
* Currently only allowed only if yielding thread has only
* Ecmascript activations (except for the Duktape.Thread.yield()
* call at the callstack top) and none of them constructor
* calls.
*
* This excludes the 'entry' thread which will always have
* a preventcount > 0.
*/
duk_hthread *resumer;
/* duk_bi_duk_object_yield() and duk_bi_duk_object_resume() ensure all of these are met */
DUK_ASSERT(thr != entry_thread); /* Duktape.Thread.yield() should prevent */
DUK_ASSERT(thr->state == DUK_HTHREAD_STATE_RUNNING); /* unchanged from Duktape.Thread.yield() */
DUK_ASSERT(thr->callstack_top >= 2); /* Ecmascript activation + Duktape.Thread.yield() activation */
DUK_ASSERT(DUK_ACT_GET_FUNC(thr->callstack + thr->callstack_top - 1) != NULL &&
DUK_HOBJECT_IS_NATIVEFUNCTION(DUK_ACT_GET_FUNC(thr->callstack + thr->callstack_top - 1)) &&
((duk_hnativefunction *) DUK_ACT_GET_FUNC(thr->callstack + thr->callstack_top - 1))->func == duk_bi_thread_yield);
DUK_ASSERT(DUK_ACT_GET_FUNC(thr->callstack + thr->callstack_top - 2) != NULL &&
DUK_HOBJECT_IS_COMPILEDFUNCTION(DUK_ACT_GET_FUNC(thr->callstack + thr->callstack_top - 2))); /* an Ecmascript function */
DUK_ASSERT_DISABLE((thr->callstack + thr->callstack_top - 2)->idx_retval >= 0); /* unsigned */
resumer = thr->resumer;
DUK_ASSERT(resumer != NULL);
DUK_ASSERT(resumer->state == DUK_HTHREAD_STATE_RESUMED); /* written by a previous RESUME handling */
DUK_ASSERT(resumer->callstack_top >= 2); /* Ecmascript activation + Duktape.Thread.resume() activation */
DUK_ASSERT(DUK_ACT_GET_FUNC(resumer->callstack + resumer->callstack_top - 1) != NULL &&
DUK_HOBJECT_IS_NATIVEFUNCTION(DUK_ACT_GET_FUNC(resumer->callstack + resumer->callstack_top - 1)) &&
((duk_hnativefunction *) DUK_ACT_GET_FUNC(resumer->callstack + resumer->callstack_top - 1))->func == duk_bi_thread_resume);
DUK_ASSERT(DUK_ACT_GET_FUNC(resumer->callstack + resumer->callstack_top - 2) != NULL &&
DUK_HOBJECT_IS_COMPILEDFUNCTION(DUK_ACT_GET_FUNC(resumer->callstack + resumer->callstack_top - 2))); /* an Ecmascript function */
DUK_ASSERT_DISABLE((resumer->callstack + resumer->callstack_top - 2)->idx_retval >= 0); /* unsigned */
if (thr->heap->lj.iserror) {
thr->state = DUK_HTHREAD_STATE_YIELDED;
thr->resumer = NULL;
resumer->state = DUK_HTHREAD_STATE_RUNNING;
DUK_HEAP_SWITCH_THREAD(thr->heap, resumer);
thr = resumer;
thr->heap->lj.type = DUK_LJ_TYPE_THROW;
/* lj.value1 is already set */
DUK_ASSERT(thr->heap->lj.iserror); /* already set */
DUK_DD(DUK_DDPRINT("-> yield an error, converted to a throw in the resumer, propagate"));
goto check_longjmp;
} else {
duk__handle_yield(thr, resumer, resumer->callstack_top - 2, &thr->heap->lj.value1);
thr->state = DUK_HTHREAD_STATE_YIELDED;
thr->resumer = NULL;
resumer->state = DUK_HTHREAD_STATE_RUNNING;
DUK_HEAP_SWITCH_THREAD(thr->heap, resumer);
#if 0
thr = resumer; /* not needed, as we exit right away */
#endif
DUK_DD(DUK_DDPRINT("-> yield a value, restart execution in resumer"));
retval = DUK__LONGJMP_RESTART;
goto wipe_and_return;
}
DUK_UNREACHABLE();
break; /* never here */
}
case DUK_LJ_TYPE_THROW: {
/*
* Three possible outcomes:
* * A try or finally catcher is found => resume there.
* (or)
* * The error propagates to the bytecode executor entry
* level (and we're in the entry thread) => rethrow
* with a new longjmp(), after restoring the previous
* catchpoint.
* * The error is not caught in the current thread, so
* the thread finishes with an error. This works like
* a yielded error, except that the thread is finished
* and can no longer be resumed. (There is always a
* resumer in this case.)
*
* Note: until we hit the entry level, there can only be
* Ecmascript activations.
*/
duk_catcher *cat;
duk_hthread *resumer;
cat = thr->catchstack + thr->catchstack_top - 1;
while (cat >= thr->catchstack) {
if (thr == entry_thread &&
cat->callstack_index < entry_callstack_index) {
/* entry level reached */
break;
}
if (DUK_CAT_HAS_CATCH_ENABLED(cat)) {
DUK_ASSERT(DUK_CAT_GET_TYPE(cat) == DUK_CAT_TYPE_TCF);
duk__handle_catch(thr,
cat - thr->catchstack,
&thr->heap->lj.value1,
DUK_LJ_TYPE_THROW);
DUK_DD(DUK_DDPRINT("-> throw caught by a 'catch' clause, restart execution"));
retval = DUK__LONGJMP_RESTART;
goto wipe_and_return;
}
if (DUK_CAT_HAS_FINALLY_ENABLED(cat)) {
DUK_ASSERT(DUK_CAT_GET_TYPE(cat) == DUK_CAT_TYPE_TCF);
DUK_ASSERT(!DUK_CAT_HAS_CATCH_ENABLED(cat));
duk__handle_finally(thr,
cat - thr->catchstack,
&thr->heap->lj.value1,
DUK_LJ_TYPE_THROW);
DUK_DD(DUK_DDPRINT("-> throw caught by a 'finally' clause, restart execution"));
retval = DUK__LONGJMP_RESTART;
goto wipe_and_return;
}
cat--;
}
if (thr == entry_thread) {
/* not caught by anything before entry level; rethrow and let the
* final catcher unwind everything
*/
#if 0
duk_hthread_catchstack_unwind(thr, (cat - thr->catchstack) + 1); /* leave 'cat' as top catcher (also works if catchstack exhausted) */
duk_hthread_callstack_unwind(thr, entry_callstack_index + 1);
#endif
DUK_D(DUK_DPRINT("-> throw propagated up to entry level, rethrow and exit bytecode executor"));
retval = DUK__LONGJMP_RETHROW;
goto just_return;
/* Note: MUST NOT wipe_and_return here, as heap->lj must remain intact */
}
DUK_DD(DUK_DDPRINT("-> throw not caught by current thread, yield error to resumer and recheck longjmp"));
/* not caught by current thread, thread terminates (yield error to resumer);
* note that this may cause a cascade if the resumer terminates with an uncaught
* exception etc (this is OK, but needs careful testing)
*/
DUK_ASSERT(thr->resumer != NULL);
DUK_ASSERT(thr->resumer->callstack_top >= 2); /* Ecmascript activation + Duktape.Thread.resume() activation */
DUK_ASSERT(DUK_ACT_GET_FUNC(thr->resumer->callstack + thr->resumer->callstack_top - 1) != NULL &&
DUK_HOBJECT_IS_NATIVEFUNCTION(DUK_ACT_GET_FUNC(thr->resumer->callstack + thr->resumer->callstack_top - 1)) &&
((duk_hnativefunction *) DUK_ACT_GET_FUNC(thr->resumer->callstack + thr->resumer->callstack_top - 1))->func == duk_bi_thread_resume); /* Duktape.Thread.resume() */
DUK_ASSERT(DUK_ACT_GET_FUNC(thr->resumer->callstack + thr->resumer->callstack_top - 2) != NULL &&
DUK_HOBJECT_IS_COMPILEDFUNCTION(DUK_ACT_GET_FUNC(thr->resumer->callstack + thr->resumer->callstack_top - 2))); /* an Ecmascript function */
resumer = thr->resumer;
/* reset longjmp */
DUK_ASSERT(thr->heap->lj.type == DUK_LJ_TYPE_THROW); /* already set */
/* lj.value1 already set */
duk_hthread_terminate(thr); /* updates thread state, minimizes its allocations */
DUK_ASSERT(thr->state == DUK_HTHREAD_STATE_TERMINATED);
thr->resumer = NULL;
resumer->state = DUK_HTHREAD_STATE_RUNNING;
DUK_HEAP_SWITCH_THREAD(thr->heap, resumer);
thr = resumer;
goto check_longjmp;
}
case DUK_LJ_TYPE_BREAK: /* pseudotypes, not used in actual longjmps */
case DUK_LJ_TYPE_CONTINUE:
case DUK_LJ_TYPE_RETURN:
case DUK_LJ_TYPE_NORMAL:
default: {
/* should never happen, but be robust */
DUK_D(DUK_DPRINT("caught unknown longjmp type %ld, treat as internal error", (long) thr->heap->lj.type));
goto convert_to_internal_error;
}
} /* end switch */
DUK_UNREACHABLE();
wipe_and_return:
/* this is not strictly necessary, but helps debugging */
thr->heap->lj.type = DUK_LJ_TYPE_UNKNOWN;
thr->heap->lj.iserror = 0;
DUK_TVAL_SET_UNDEFINED_UPDREF(thr, &thr->heap->lj.value1); /* side effects */
DUK_TVAL_SET_UNDEFINED_UPDREF(thr, &thr->heap->lj.value2); /* side effects */
just_return:
return retval;
convert_to_internal_error:
/* This could also be thrown internally (set the error, goto check_longjmp),
* but it's better for internal errors to bubble outwards so that we won't
* infinite loop in this catchpoint.
*/
DUK_ERROR_INTERNAL_DEFMSG(thr);
DUK_UNREACHABLE();
return retval;
}
/* Handle a BREAK/CONTINUE opcode. Avoid using longjmp() for BREAK/CONTINUE
* handling because it has a measurable performance impact in ordinary
* environments and an extreme impact in Emscripten (GH-342).
*/
DUK_LOCAL void duk__handle_break_or_continue(duk_hthread *thr,
duk_uint_t label_id,
duk_small_uint_t lj_type) {
duk_catcher *cat;
duk_size_t orig_callstack_index;
DUK_ASSERT(thr != NULL);
/*
* Find a matching label catcher or 'finally' catcher in
* the same function.
*
* A label catcher must always exist and will match unless
* a 'finally' captures the break/continue first. It is the
* compiler's responsibility to ensure that labels are used
* correctly.
*/
/* Note: thr->catchstack_top may be 0, so that cat < thr->catchstack
* initially. This is OK and intended.
*/
cat = thr->catchstack + thr->catchstack_top - 1;
DUK_ASSERT(thr->callstack_top > 0);
orig_callstack_index = thr->callstack_top - 1;
DUK_DDD(DUK_DDDPRINT("handling break/continue with label=%ld, callstack index=%ld",
(long) label_id, (long) cat->callstack_index));
while (cat >= thr->catchstack) {
if (cat->callstack_index != orig_callstack_index) {
break;
}
DUK_DDD(DUK_DDDPRINT("considering catcher %ld: type=%ld label=%ld",
(long) (cat - thr->catchstack),
(long) DUK_CAT_GET_TYPE(cat),
(long) DUK_CAT_GET_LABEL(cat)));
if (DUK_CAT_GET_TYPE(cat) == DUK_CAT_TYPE_TCF &&
DUK_CAT_HAS_FINALLY_ENABLED(cat)) {
duk_size_t cat_idx;
duk_tval tv_tmp;
cat_idx = (duk_size_t) (cat - thr->catchstack); /* get before side effects */
DUK_TVAL_SET_FASTINT_U32(&tv_tmp, (duk_uint32_t) label_id);
duk__handle_finally(thr, cat_idx, &tv_tmp, lj_type);
DUK_DD(DUK_DDPRINT("-> break/continue caught by 'finally', restart execution"));
return;
}
if (DUK_CAT_GET_TYPE(cat) == DUK_CAT_TYPE_LABEL &&
(duk_uint_t) DUK_CAT_GET_LABEL(cat) == label_id) {
duk_size_t cat_idx;
cat_idx = (duk_size_t) (cat - thr->catchstack);
duk__handle_label(thr, cat_idx, lj_type);
DUK_DD(DUK_DDPRINT("-> break/continue caught by a label catcher (in the same function), restart execution"));
return;
}
cat--;
}
/* should never happen, but be robust */
DUK_D(DUK_DPRINT("-> break/continue not caught by anything in the current function (should never happen), throw internal error"));
DUK_ERROR_INTERNAL_DEFMSG(thr);
return;
}
/* Handle a RETURN opcode. Avoid using longjmp() for return handling because
* it has a measurable performance impact in ordinary environments and an extreme
* impact in Emscripten (GH-342). Return value is on value stack top.
*/
DUK_LOCAL duk_small_uint_t duk__handle_return(duk_hthread *thr,
duk_hthread *entry_thread,
duk_size_t entry_callstack_top) {
duk_tval *tv1;
duk_tval *tv2;
duk_hthread *resumer;
duk_catcher *cat;
duk_size_t new_cat_top;
duk_size_t orig_callstack_index;
/* We can directly access value stack here. */
DUK_ASSERT(thr != NULL);
DUK_ASSERT(entry_thread != NULL);
DUK_ASSERT(thr->valstack_top - 1 >= thr->valstack_bottom);
tv1 = thr->valstack_top - 1;
DUK_TVAL_CHKFAST_INPLACE(tv1); /* fastint downgrade check for return values */
/*
* Four possible outcomes:
*
* 1. A 'finally' in the same function catches the 'return'.
* It may continue to propagate when 'finally' is finished,
* or it may be neutralized by 'finally' (both handled by
* ENDFIN).
*
* 2. The return happens at the entry level of the bytecode
* executor, so return from the executor (in C stack).
*
* 3. There is a calling (Ecmascript) activation in the call
* stack => return to it, in the same executor instance.
*
* 4. There is no calling activation, and the thread is
* terminated. There is always a resumer in this case,
* which gets the return value similarly to a 'yield'
* (except that the current thread can no longer be
* resumed).
*/
DUK_ASSERT(thr != NULL);
DUK_ASSERT(thr->callstack_top >= 1);
DUK_ASSERT(thr->catchstack != NULL);
/* XXX: does not work if thr->catchstack is NULL */
/* XXX: does not work if thr->catchstack is allocated but lowest pointer */
cat = thr->catchstack + thr->catchstack_top - 1; /* may be < thr->catchstack initially */
DUK_ASSERT(thr->callstack_top > 0); /* ensures callstack_top - 1 >= 0 */
orig_callstack_index = thr->callstack_top - 1;
while (cat >= thr->catchstack) {
if (cat->callstack_index != orig_callstack_index) {
break;
}
if (DUK_CAT_GET_TYPE(cat) == DUK_CAT_TYPE_TCF &&
DUK_CAT_HAS_FINALLY_ENABLED(cat)) {
duk_size_t cat_idx;
cat_idx = (duk_size_t) (cat - thr->catchstack); /* get before side effects */
DUK_ASSERT(thr->valstack_top - 1 >= thr->valstack_bottom);
duk__handle_finally(thr, cat_idx, thr->valstack_top - 1, DUK_LJ_TYPE_RETURN);
DUK_DD(DUK_DDPRINT("-> return caught by 'finally', restart execution"));
return DUK__RETHAND_RESTART;
}
cat--;
}
/* If out of catchstack, cat = thr->catchstack - 1;
* new_cat_top will be 0 in that case.
*/
new_cat_top = (duk_size_t) ((cat + 1) - thr->catchstack);
cat = NULL; /* avoid referencing, invalidated */
DUK_DDD(DUK_DDDPRINT("no catcher in catch stack, return to calling activation / yield"));
if (thr == entry_thread &&
thr->callstack_top == entry_callstack_top) {
/* Return to the bytecode executor caller which will unwind stacks.
* Return value is already on the stack top: [ ... retval ].
*/
/* XXX: could unwind catchstack here, so that call handling
* didn't need to do that?
*/
DUK_DDD(DUK_DDDPRINT("-> return propagated up to entry level, exit bytecode executor"));
return DUK__RETHAND_FINISHED;
}
if (thr->callstack_top >= 2) {
/* There is a caller; it MUST be an Ecmascript caller (otherwise it would
* match entry level check)
*/
DUK_DDD(DUK_DDDPRINT("return to Ecmascript caller, idx_retval=%ld, lj_value1=%!T",
(long) (thr->callstack + thr->callstack_top - 2)->idx_retval,
(duk_tval *) &thr->heap->lj.value1));
DUK_ASSERT(DUK_HOBJECT_IS_COMPILEDFUNCTION(DUK_ACT_GET_FUNC(thr->callstack + thr->callstack_top - 2))); /* must be ecmascript */
tv1 = thr->valstack + (thr->callstack + thr->callstack_top - 2)->idx_retval;
DUK_ASSERT(thr->valstack_top - 1 >= thr->valstack_bottom);
tv2 = thr->valstack_top - 1;
DUK_TVAL_SET_TVAL_UPDREF(thr, tv1, tv2); /* side effects */
DUK_DDD(DUK_DDDPRINT("return value at idx_retval=%ld is %!T",
(long) (thr->callstack + thr->callstack_top - 2)->idx_retval,
(duk_tval *) (thr->valstack + (thr->callstack + thr->callstack_top - 2)->idx_retval)));
duk_hthread_catchstack_unwind(thr, new_cat_top); /* leave 'cat' as top catcher (also works if catchstack exhausted) */
duk_hthread_callstack_unwind(thr, thr->callstack_top - 1);
duk__reconfig_valstack_ecma_return(thr, thr->callstack_top - 1);
DUK_DD(DUK_DDPRINT("-> return not intercepted, restart execution in caller"));
return DUK__RETHAND_RESTART;
}
DUK_DD(DUK_DDPRINT("no calling activation, thread finishes (similar to yield)"));
DUK_ASSERT(thr->resumer != NULL);
DUK_ASSERT(thr->resumer->callstack_top >= 2); /* Ecmascript activation + Duktape.Thread.resume() activation */
DUK_ASSERT(DUK_ACT_GET_FUNC(thr->resumer->callstack + thr->resumer->callstack_top - 1) != NULL &&
DUK_HOBJECT_IS_NATIVEFUNCTION(DUK_ACT_GET_FUNC(thr->resumer->callstack + thr->resumer->callstack_top - 1)) &&
((duk_hnativefunction *) DUK_ACT_GET_FUNC(thr->resumer->callstack + thr->resumer->callstack_top - 1))->func == duk_bi_thread_resume); /* Duktape.Thread.resume() */
DUK_ASSERT(DUK_ACT_GET_FUNC(thr->resumer->callstack + thr->resumer->callstack_top - 2) != NULL &&
DUK_HOBJECT_IS_COMPILEDFUNCTION(DUK_ACT_GET_FUNC(thr->resumer->callstack + thr->resumer->callstack_top - 2))); /* an Ecmascript function */
DUK_ASSERT_DISABLE((thr->resumer->callstack + thr->resumer->callstack_top - 2)->idx_retval >= 0); /* unsigned */
DUK_ASSERT(thr->state == DUK_HTHREAD_STATE_RUNNING);
DUK_ASSERT(thr->resumer->state == DUK_HTHREAD_STATE_RESUMED);
resumer = thr->resumer;
/* Share yield longjmp handler. */
DUK_ASSERT(thr->valstack_top - 1 >= thr->valstack_bottom);
duk__handle_yield(thr, resumer, resumer->callstack_top - 2, thr->valstack_top - 1);
duk_hthread_terminate(thr); /* updates thread state, minimizes its allocations */
DUK_ASSERT(thr->state == DUK_HTHREAD_STATE_TERMINATED);
thr->resumer = NULL;
resumer->state = DUK_HTHREAD_STATE_RUNNING;
DUK_HEAP_SWITCH_THREAD(thr->heap, resumer);
#if 0
thr = resumer; /* not needed */
#endif
DUK_DD(DUK_DDPRINT("-> return not caught, thread terminated; handle like yield, restart execution in resumer"));
return DUK__RETHAND_RESTART;
}
/*
* Executor interrupt handling
*
* The handler is called whenever the interrupt countdown reaches zero
* (or below). The handler must perform whatever checks are activated,
* e.g. check for cumulative step count to impose an execution step
* limit or check for breakpoints or other debugger interaction.
*
* When the actions are done, the handler must reinit the interrupt
* init and counter values. The 'init' value must indicate how many
* bytecode instructions are executed before the next interrupt. The
* counter must interface with the bytecode executor loop. Concretely,
* the new init value is normally one higher than the new counter value.
* For instance, to execute exactly one bytecode instruction the init
* value is set to 1 and the counter to 0. If an error is thrown by the
* interrupt handler, the counters are set to the same value (e.g. both
* to 0 to cause an interrupt when the next bytecode instruction is about
* to be executed after error handling).
*
* Maintaining the init/counter value properly is important for accurate
* behavior. For instance, executor step limit needs a cumulative step
* count which is simply computed as a sum of 'init' values. This must
* work accurately even when single stepping.
*/
#if defined(DUK_USE_INTERRUPT_COUNTER)
#define DUK__INT_NOACTION 0 /* no specific action, resume normal execution */
#define DUK__INT_RESTART 1 /* must "goto restart_execution", e.g. breakpoints changed */
#if defined(DUK_USE_DEBUGGER_SUPPORT)
DUK_LOCAL void duk__interrupt_handle_debugger(duk_hthread *thr, duk_bool_t *out_immediate, duk_small_uint_t *out_interrupt_retval) {
duk_context *ctx;
duk_activation *act;
duk_breakpoint *bp;
duk_breakpoint **bp_active;
duk_uint_fast32_t line = 0;
duk_bool_t process_messages;
duk_bool_t processed_messages = 0;
DUK_ASSERT(thr->heap->dbg_processing == 0); /* don't re-enter e.g. during Eval */
ctx = (duk_context *) thr;
act = thr->callstack + thr->callstack_top - 1;
/* It might seem that replacing 'thr->heap' with just 'heap' below
* might be a good idea, but it increases code size slightly
* (probably due to unnecessary spilling) at least on x64.
*/
/*
* Breakpoint and step state checks
*/
if (act->flags & DUK_ACT_FLAG_BREAKPOINT_ACTIVE ||
(thr->heap->dbg_step_thread == thr &&
thr->heap->dbg_step_csindex == thr->callstack_top - 1)) {
line = duk_debug_curr_line(thr);
if (act->prev_line != line) {
/* Stepped? Step out is handled by callstack unwind. */
if ((thr->heap->dbg_step_type == DUK_STEP_TYPE_INTO ||
thr->heap->dbg_step_type == DUK_STEP_TYPE_OVER) &&
(thr->heap->dbg_step_thread == thr) &&
(thr->heap->dbg_step_csindex == thr->callstack_top - 1) &&
(line != thr->heap->dbg_step_startline)) {
DUK_D(DUK_DPRINT("STEP STATE TRIGGERED PAUSE at line %ld",
(long) line));
DUK_HEAP_SET_PAUSED(thr->heap);
}
/* Check for breakpoints only on line transition.
* Breakpoint is triggered when we enter the target
* line from a different line, and the previous line
* was within the same function.
*
* This condition is tricky: the condition used to be
* that transition to -or across- the breakpoint line
* triggered the breakpoint. This seems intuitively
* better because it handles breakpoints on lines with
* no emitted opcodes; but this leads to the issue
* described in: https://github.com/svaarala/duktape/issues/263.
*/
bp_active = thr->heap->dbg_breakpoints_active;
for (;;) {
bp = *bp_active++;
if (bp == NULL) {
break;
}
DUK_ASSERT(bp->filename != NULL);
if (act->prev_line != bp->line && line == bp->line) {
DUK_D(DUK_DPRINT("BREAKPOINT TRIGGERED at %!O:%ld",
(duk_heaphdr *) bp->filename, (long) bp->line));
DUK_HEAP_SET_PAUSED(thr->heap);
}
}
} else {
;
}
act->prev_line = line;
}
/*
* Rate limit check for sending status update or peeking into
* the debug transport. Both can be expensive operations that
* we don't want to do on every opcode.
*
* Making sure the interval remains reasonable on a wide variety
* of targets and bytecode is difficult without a timestamp, so
* we use a Date-provided timestamp for the rate limit check.
* But since it's also expensive to get a timestamp, a bytecode
* counter is used to rate limit getting timestamps.
*/
process_messages = 0;
if (thr->heap->dbg_state_dirty || thr->heap->dbg_paused || thr->heap->dbg_detaching) {
/* Enter message processing loop for sending Status notifys and
* to finish a pending detach.
*/
process_messages = 1;
}
/* XXX: remove heap->dbg_exec_counter, use heap->inst_count_interrupt instead? */
thr->heap->dbg_exec_counter += thr->interrupt_init;
if (thr->heap->dbg_exec_counter - thr->heap->dbg_last_counter >= DUK_HEAP_DBG_RATELIMIT_OPCODES) {
/* Overflow of the execution counter is fine and doesn't break
* anything here.
*/
duk_double_t now, diff_last;
thr->heap->dbg_last_counter = thr->heap->dbg_exec_counter;
now = DUK_USE_DATE_GET_NOW(ctx);
diff_last = now - thr->heap->dbg_last_time;
if (diff_last < 0.0 || diff_last >= (duk_double_t) DUK_HEAP_DBG_RATELIMIT_MILLISECS) {
/* Negative value checked so that a "time jump" works
* reasonably.
*
* Same interval is now used for status sending and
* peeking.
*/
thr->heap->dbg_last_time = now;
thr->heap->dbg_state_dirty = 1;
process_messages = 1;
}
}
/*
* Process messages and send status if necessary.
*
* If we're paused, we'll block for new messages. If we're not
* paused, we'll process anything we can peek but won't block
* for more. Detach (and re-attach) handling is all localized
* to duk_debug_process_messages() too.
*
* Debugger writes outside the message loop may cause debugger
* detach1 phase to run, after which dbg_read_cb == NULL and
* dbg_detaching != 0. The message loop will finish the detach
* by running detach2 phase, so enter the message loop also when
* detaching.
*/
act = NULL; /* may be changed */
if (process_messages) {
DUK_ASSERT(thr->heap->dbg_processing == 0);
processed_messages = duk_debug_process_messages(thr, 0 /*no_block*/);
DUK_ASSERT(thr->heap->dbg_processing == 0);
}
/* Continue checked execution if there are breakpoints or we're stepping.
* Also use checked execution if paused flag is active - it shouldn't be
* because the debug message loop shouldn't terminate if it was. Step out
* is handled by callstack unwind and doesn't need checked execution.
* Note that debugger may have detached due to error or explicit request
* above, so we must recheck attach status.
*/
if (DUK_HEAP_IS_DEBUGGER_ATTACHED(thr->heap)) {
act = thr->callstack + thr->callstack_top - 1; /* relookup, may have changed */
if (act->flags & DUK_ACT_FLAG_BREAKPOINT_ACTIVE ||
((thr->heap->dbg_step_type == DUK_STEP_TYPE_INTO ||
thr->heap->dbg_step_type == DUK_STEP_TYPE_OVER) &&
thr->heap->dbg_step_thread == thr &&
thr->heap->dbg_step_csindex == thr->callstack_top - 1) ||
thr->heap->dbg_paused) {
*out_immediate = 1;
}
/* If we processed any debug messages breakpoints may have
* changed; restart execution to re-check active breakpoints.
*/
if (processed_messages) {
DUK_D(DUK_DPRINT("processed debug messages, restart execution to recheck possibly changed breakpoints"));
*out_interrupt_retval = DUK__INT_RESTART;
}
} else {
DUK_D(DUK_DPRINT("debugger became detached, resume normal execution"));
}
}
#endif /* DUK_USE_DEBUGGER_SUPPORT */
DUK_LOCAL duk_small_uint_t duk__executor_interrupt(duk_hthread *thr) {
duk_int_t ctr;
duk_activation *act;
duk_hcompiledfunction *fun;
duk_bool_t immediate = 0;
duk_small_uint_t retval;
DUK_ASSERT(thr != NULL);
DUK_ASSERT(thr->heap != NULL);
DUK_ASSERT(thr->callstack != NULL);
DUK_ASSERT(thr->callstack_top > 0);
#if defined(DUK_USE_DEBUG)
thr->heap->inst_count_interrupt += thr->interrupt_init;
DUK_DD(DUK_DDPRINT("execution interrupt, counter=%ld, init=%ld, "
"instruction counts: executor=%ld, interrupt=%ld",
(long) thr->interrupt_counter, (long) thr->interrupt_init,
(long) thr->heap->inst_count_exec, (long) thr->heap->inst_count_interrupt));
#endif
retval = DUK__INT_NOACTION;
ctr = DUK_HTHREAD_INTCTR_DEFAULT;
/*
* Avoid nested calls. Concretely this happens during debugging, e.g.
* when we eval() an expression.
*
* Also don't interrupt if we're currently doing debug processing
* (which can be initiated outside the bytecode executor) as this
* may cause the debugger to be called recursively. Check required
* for correct operation of throw intercept and other "exotic" halting
* scenarios.
*/
#if defined(DUK_USE_DEBUGGER_SUPPORT)
if (DUK_HEAP_HAS_INTERRUPT_RUNNING(thr->heap) || thr->heap->dbg_processing) {
#else
if (DUK_HEAP_HAS_INTERRUPT_RUNNING(thr->heap)) {
#endif
DUK_DD(DUK_DDPRINT("nested executor interrupt, ignoring"));
/* Set a high interrupt counter; the original executor
* interrupt invocation will rewrite before exiting.
*/
thr->interrupt_init = ctr;
thr->interrupt_counter = ctr - 1;
return DUK__INT_NOACTION;
}
DUK_HEAP_SET_INTERRUPT_RUNNING(thr->heap);
act = thr->callstack + thr->callstack_top - 1;
fun = (duk_hcompiledfunction *) DUK_ACT_GET_FUNC(act);
DUK_ASSERT(DUK_HOBJECT_HAS_COMPILEDFUNCTION((duk_hobject *) fun));
DUK_UNREF(fun);
#if defined(DUK_USE_EXEC_TIMEOUT_CHECK)
/*
* Execution timeout check
*/
if (DUK_USE_EXEC_TIMEOUT_CHECK(thr->heap->heap_udata)) {
/* Keep throwing an error whenever we get here. The unusual values
* are set this way because no instruction is ever executed, we just
* throw an error until all try/catch/finally and other catchpoints
* have been exhausted. Duktape/C code gets control at each protected
* call but whenever it enters back into Duktape the RangeError gets
* raised. User exec timeout check must consistently indicate a timeout
* until we've fully bubbled out of Duktape.
*/
DUK_D(DUK_DPRINT("execution timeout, throwing a RangeError"));
thr->interrupt_init = 0;
thr->interrupt_counter = 0;
DUK_HEAP_CLEAR_INTERRUPT_RUNNING(thr->heap);
DUK_ERROR_RANGE(thr, "execution timeout");
}
#endif /* DUK_USE_EXEC_TIMEOUT_CHECK */
#if defined(DUK_USE_DEBUGGER_SUPPORT)
if (!thr->heap->dbg_processing &&
(thr->heap->dbg_read_cb != NULL || thr->heap->dbg_detaching)) {
/* Avoid recursive re-entry; enter when we're attached or
* detaching (to finish off the pending detach).
*/
duk__interrupt_handle_debugger(thr, &immediate, &retval);
act = thr->callstack + thr->callstack_top - 1; /* relookup if changed */
DUK_UNREF(act); /* 'act' is no longer accessed, scanbuild fix */
}
#endif /* DUK_USE_DEBUGGER_SUPPORT */
/*
* Update the interrupt counter
*/
if (immediate) {
/* Cause an interrupt after executing one instruction. */
ctr = 1;
}
/* The counter value is one less than the init value: init value should
* indicate how many instructions are executed before interrupt. To
* execute 1 instruction (after interrupt handler return), counter must
* be 0.
*/
DUK_ASSERT(ctr >= 1);
thr->interrupt_init = ctr;
thr->interrupt_counter = ctr - 1;
DUK_HEAP_CLEAR_INTERRUPT_RUNNING(thr->heap);
return retval;
}
#endif /* DUK_USE_INTERRUPT_COUNTER */
/*
* Debugger handling for executor restart
*
* Check for breakpoints, stepping, etc, and figure out if we should execute
* in checked or normal mode. Note that we can't do this when an activation
* is created, because breakpoint status (and stepping status) may change
* later, so we must recheck every time we're executing an activation.
* This primitive should be side effect free to avoid changes during check.
*/
#if defined(DUK_USE_DEBUGGER_SUPPORT)
DUK_LOCAL void duk__executor_recheck_debugger(duk_hthread *thr, duk_activation *act, duk_hcompiledfunction *fun) {
duk_heap *heap;
duk_tval *tv_tmp;
duk_hstring *filename;
duk_small_uint_t bp_idx;
duk_breakpoint **bp_active;
DUK_ASSERT(thr != NULL);
DUK_ASSERT(act != NULL);
DUK_ASSERT(fun != NULL);
heap = thr->heap;
bp_active = heap->dbg_breakpoints_active;
act->flags &= ~DUK_ACT_FLAG_BREAKPOINT_ACTIVE;
tv_tmp = duk_hobject_find_existing_entry_tval_ptr(thr->heap, (duk_hobject *) fun, DUK_HTHREAD_STRING_FILE_NAME(thr));
if (tv_tmp && DUK_TVAL_IS_STRING(tv_tmp)) {
filename = DUK_TVAL_GET_STRING(tv_tmp);
/* Figure out all active breakpoints. A breakpoint is
* considered active if the current function's fileName
* matches the breakpoint's fileName, AND there is no
* inner function that has matching line numbers
* (otherwise a breakpoint would be triggered both
* inside and outside of the inner function which would
* be confusing). Example:
*
* function foo() {
* print('foo');
* function bar() { <-. breakpoints in these
* print('bar'); | lines should not affect
* } <-' foo() execution
* bar();
* }
*
* We need a few things that are only available when
* debugger support is enabled: (1) a line range for
* each function, and (2) access to the function
* template to access the inner functions (and their
* line ranges).
*
* It's important to have a narrow match for active
* breakpoints so that we don't enter checked execution
* when that's not necessary. For instance, if we're
* running inside a certain function and there's
* breakpoint outside in (after the call site), we
* don't want to slow down execution of the function.
*/
for (bp_idx = 0; bp_idx < heap->dbg_breakpoint_count; bp_idx++) {
duk_breakpoint *bp = heap->dbg_breakpoints + bp_idx;
duk_hobject **funcs, **funcs_end;
duk_hcompiledfunction *inner_fun;
duk_bool_t bp_match;
if (bp->filename == filename &&
bp->line >= fun->start_line && bp->line <= fun->end_line) {
bp_match = 1;
DUK_DD(DUK_DDPRINT("breakpoint filename and line match: "
"%s:%ld vs. %s (line %ld vs. %ld-%ld)",
DUK_HSTRING_GET_DATA(bp->filename),
(long) bp->line,
DUK_HSTRING_GET_DATA(filename),
(long) bp->line,
(long) fun->start_line,
(long) fun->end_line));
funcs = DUK_HCOMPILEDFUNCTION_GET_FUNCS_BASE(thr->heap, fun);
funcs_end = DUK_HCOMPILEDFUNCTION_GET_FUNCS_END(thr->heap, fun);
while (funcs != funcs_end) {
inner_fun = (duk_hcompiledfunction *) *funcs;
DUK_ASSERT(DUK_HOBJECT_IS_COMPILEDFUNCTION((duk_hobject *) inner_fun));
if (bp->line >= inner_fun->start_line && bp->line <= inner_fun->end_line) {
DUK_DD(DUK_DDPRINT("inner function masks ('captures') breakpoint"));
bp_match = 0;
break;
}
funcs++;
}
if (bp_match) {
/* No need to check for size of bp_active list,
* it's always larger than maximum number of
* breakpoints.
*/
act->flags |= DUK_ACT_FLAG_BREAKPOINT_ACTIVE;
*bp_active = heap->dbg_breakpoints + bp_idx;
bp_active++;
}
}
}
}
*bp_active = NULL; /* terminate */
DUK_DD(DUK_DDPRINT("ACTIVE BREAKPOINTS: %ld", (long) (bp_active - thr->heap->dbg_breakpoints_active)));
/* Force pause if we were doing "step into" in another activation. */
if (thr->heap->dbg_step_thread != NULL &&
thr->heap->dbg_step_type == DUK_STEP_TYPE_INTO &&
(thr->heap->dbg_step_thread != thr ||
thr->heap->dbg_step_csindex != thr->callstack_top - 1)) {
DUK_D(DUK_DPRINT("STEP INTO ACTIVE, FORCE PAUSED"));
DUK_HEAP_SET_PAUSED(thr->heap);
}
/* Force interrupt right away if we're paused or in "checked mode".
* Step out is handled by callstack unwind.
*/
if (act->flags & (DUK_ACT_FLAG_BREAKPOINT_ACTIVE) ||
thr->heap->dbg_paused ||
(thr->heap->dbg_step_type != DUK_STEP_TYPE_OUT &&
thr->heap->dbg_step_csindex == thr->callstack_top - 1)) {
/* We'll need to interrupt early so recompute the init
* counter to reflect the number of bytecode instructions
* executed so that step counts for e.g. debugger rate
* limiting are accurate.
*/
DUK_ASSERT(thr->interrupt_counter <= thr->interrupt_init);
thr->interrupt_init = thr->interrupt_init - thr->interrupt_counter;
thr->interrupt_counter = 0;
}
}
#endif /* DUK_USE_DEBUGGER_SUPPORT */
/*
* Ecmascript bytecode executor.
*
* Resume execution for the current thread from its current activation.
* Returns when execution would return from the entry level activation,
* leaving a single return value on top of the stack. Function calls
* and thread resumptions are handled internally. If an error occurs,
* a longjmp() with type DUK_LJ_TYPE_THROW is called on the entry level
* setjmp() jmpbuf.
*
* Ecmascript function calls and coroutine resumptions are handled
* internally (by the outer executor function) without recursive C calls.
* Other function calls are handled using duk_handle_call(), increasing
* C recursion depth.
*
* Abrupt completions (= long control tranfers) are handled either
* directly by reconfiguring relevant stacks and restarting execution,
* or via a longjmp. Longjmp-free handling is preferable for performance
* (especially Emscripten performance), and is used for: break, continue,
* and return.
*
* For more detailed notes, see doc/execution.rst.
*
* Also see doc/code-issues.rst for discussion of setjmp(), longjmp(),
* and volatile.
*/
/* Presence of 'fun' is config based, there's a marginal performance
* difference and the best option is architecture dependent.
*/
#if defined(DUK_USE_EXEC_FUN_LOCAL)
#define DUK__FUN() fun
#else
#define DUK__FUN() ((duk_hcompiledfunction *) DUK_ACT_GET_FUNC((thr)->callstack + (thr)->callstack_top - 1))
#endif
#define DUK__STRICT() (DUK_HOBJECT_HAS_STRICT((duk_hobject *) DUK__FUN()))
/* Reg/const access macros: these are very footprint and performance sensitive
* so modify with care.
*/
#define DUK__REG(x) (*(thr->valstack_bottom + (x)))
#define DUK__REGP(x) (thr->valstack_bottom + (x))
#define DUK__CONST(x) (*(consts + (x)))
#define DUK__CONSTP(x) (consts + (x))
#if 0
#define DUK__REGCONST(x) ((x) < DUK_BC_REGLIMIT ? DUK__REG((x)) : DUK__CONST((x) - DUK_BC_REGLIMIT))
#define DUK__REGCONSTP(x) ((x) < DUK_BC_REGLIMIT ? DUK__REGP((x)) : DUK__CONSTP((x) - DUK_BC_REGLIMIT))
#define DUK__REGCONST(x) *((((x) < DUK_BC_REGLIMIT ? thr->valstack_bottom : consts2) + (x)))
#define DUK__REGCONSTP(x) (((x) < DUK_BC_REGLIMIT ? thr->valstack_bottom : consts2) + (x))
#endif
/* This macro works when a regconst field is 9 bits, [0,0x1ff]. Adding
* DUK_LIKELY/DUK_UNLIKELY increases code footprint and doesn't seem to
* improve performance on x64 (and actually harms performance in some tests).
*/
#define DUK__RCISREG(x) (((x) & 0x100) == 0)
#define DUK__REGCONST(x) (*((DUK__RCISREG((x)) ? thr->valstack_bottom : consts2) + (x)))
#define DUK__REGCONSTP(x) ((DUK__RCISREG((x)) ? thr->valstack_bottom : consts2) + (x))
#ifdef DUK_USE_VERBOSE_EXECUTOR_ERRORS
#define DUK__INTERNAL_ERROR(msg) do { \
DUK_ERROR_INTERNAL(thr, (msg)); \
} while (0)
#else
#define DUK__INTERNAL_ERROR(msg) do { \
goto internal_error; \
} while (0)
#endif
#define DUK__SYNC_CURR_PC() do { \
duk_activation *act; \
act = thr->callstack + thr->callstack_top - 1; \
act->curr_pc = curr_pc; \
} while (0)
#define DUK__SYNC_AND_NULL_CURR_PC() do { \
duk_activation *act; \
act = thr->callstack + thr->callstack_top - 1; \
act->curr_pc = curr_pc; \
thr->ptr_curr_pc = NULL; \
} while (0)
DUK_LOCAL void duk__handle_executor_error(duk_heap *heap,
duk_hthread *entry_thread,
duk_size_t entry_callstack_top,
duk_int_t entry_call_recursion_depth,
duk_jmpbuf *entry_jmpbuf_ptr) {
duk_small_uint_t lj_ret;
/* Longjmp callers are required to sync-and-null thr->ptr_curr_pc
* before longjmp.
*/
DUK_ASSERT(heap->curr_thread != NULL);
DUK_ASSERT(heap->curr_thread->ptr_curr_pc == NULL);
/* XXX: signalling the need to shrink check (only if unwound) */
/* Must be restored here to handle e.g. yields properly. */
heap->call_recursion_depth = entry_call_recursion_depth;
/* Switch to caller's setjmp() catcher so that if an error occurs
* during error handling, it is always propagated outwards instead
* of causing an infinite loop in our own handler.
*/
heap->lj.jmpbuf_ptr = (duk_jmpbuf *) entry_jmpbuf_ptr;
lj_ret = duk__handle_longjmp(heap->curr_thread, entry_thread, entry_callstack_top);
if (lj_ret == DUK__LONGJMP_RESTART) {
/* Restart bytecode execution, possibly with a changed thread. */
;
} else {
/* Rethrow error to calling state. */
DUK_ASSERT(lj_ret == DUK__LONGJMP_RETHROW);
/* Longjmp handling has restored jmpbuf_ptr. */
DUK_ASSERT(heap->lj.jmpbuf_ptr == entry_jmpbuf_ptr);
/* Thread may have changed, e.g. YIELD converted to THROW. */
duk_err_longjmp(heap->curr_thread);
DUK_UNREACHABLE();
}
}
/* Outer executor with setjmp/longjmp handling. */
DUK_INTERNAL void duk_js_execute_bytecode(duk_hthread *exec_thr) {
/* Entry level info. */
duk_hthread *entry_thread;
duk_size_t entry_callstack_top;
duk_int_t entry_call_recursion_depth;
duk_jmpbuf *entry_jmpbuf_ptr;
duk_jmpbuf our_jmpbuf;
duk_heap *heap;
DUK_ASSERT(exec_thr != NULL);
DUK_ASSERT(exec_thr->heap != NULL);
DUK_ASSERT(exec_thr->heap->curr_thread != NULL);
DUK_ASSERT_REFCOUNT_NONZERO_HEAPHDR((duk_heaphdr *) exec_thr);
DUK_ASSERT(exec_thr->callstack_top >= 1); /* at least one activation, ours */
DUK_ASSERT(DUK_ACT_GET_FUNC(exec_thr->callstack + exec_thr->callstack_top - 1) != NULL);
DUK_ASSERT(DUK_HOBJECT_IS_COMPILEDFUNCTION(DUK_ACT_GET_FUNC(exec_thr->callstack + exec_thr->callstack_top - 1)));
entry_thread = exec_thr;
heap = entry_thread->heap;
entry_callstack_top = entry_thread->callstack_top;
entry_call_recursion_depth = entry_thread->heap->call_recursion_depth;
entry_jmpbuf_ptr = entry_thread->heap->lj.jmpbuf_ptr;
/*
* Note: we currently assume that the setjmp() catchpoint is
* not re-entrant (longjmp() cannot be called more than once
* for a single setjmp()).
*
* See doc/code-issues.rst for notes on variable assignment
* before and after setjmp().
*/
for (;;) {
heap->lj.jmpbuf_ptr = &our_jmpbuf;
DUK_ASSERT(heap->lj.jmpbuf_ptr != NULL);
#if defined(DUK_USE_CPP_EXCEPTIONS)
try {
#else
DUK_ASSERT(heap->lj.jmpbuf_ptr == &our_jmpbuf);
if (DUK_SETJMP(our_jmpbuf.jb) == 0) {
#endif
/* Execute bytecode until returned or longjmp(). */
duk__js_execute_bytecode_inner(entry_thread, entry_callstack_top);
/* Successful return: restore jmpbuf and return to caller. */
heap->lj.jmpbuf_ptr = entry_jmpbuf_ptr;
return;
#if defined(DUK_USE_CPP_EXCEPTIONS)
} catch (duk_internal_exception &exc) {
#else
} else {
#endif
#if defined(DUK_USE_CPP_EXCEPTIONS)
DUK_UNREF(exc);
#endif
DUK_DDD(DUK_DDDPRINT("longjmp caught by bytecode executor"));
duk__handle_executor_error(heap,
entry_thread,
entry_callstack_top,
entry_call_recursion_depth,
entry_jmpbuf_ptr);
}
#if defined(DUK_USE_CPP_EXCEPTIONS)
catch (std::exception &exc) {
const char *what = exc.what();
if (!what) {
what = "unknown";
}
DUK_D(DUK_DPRINT("unexpected c++ std::exception (perhaps thrown by user code)"));
try {
DUK_ASSERT(heap->curr_thread != NULL);
DUK_ERROR_FMT1(heap->curr_thread, DUK_ERR_API_ERROR, "caught invalid c++ std::exception '%s' (perhaps thrown by user code)", what);
} catch (duk_internal_exception exc) {
DUK_D(DUK_DPRINT("caught api error thrown from unexpected c++ std::exception"));
DUK_UNREF(exc);
duk__handle_executor_error(heap,
entry_thread,
entry_callstack_top,
entry_call_recursion_depth,
entry_jmpbuf_ptr);
}
} catch (...) {
DUK_D(DUK_DPRINT("unexpected c++ exception (perhaps thrown by user code)"));
try {
DUK_ASSERT(heap->curr_thread != NULL);
DUK_ERROR_API(heap->curr_thread, "caught invalid c++ exception (perhaps thrown by user code)");
} catch (duk_internal_exception exc) {
DUK_D(DUK_DPRINT("caught api error thrown from unexpected c++ exception"));
DUK_UNREF(exc);
duk__handle_executor_error(heap,
entry_thread,
entry_callstack_top,
entry_call_recursion_depth,
entry_jmpbuf_ptr);
}
}
#endif
}
DUK_UNREACHABLE();
}
/* Inner executor, performance critical. */
DUK_LOCAL DUK_NOINLINE void duk__js_execute_bytecode_inner(duk_hthread *entry_thread, duk_size_t entry_callstack_top) {
/* Current PC, accessed by other functions through thr->ptr_to_curr_pc.
* Critical for performance. It would be safest to make this volatile,
* but that eliminates performance benefits; aliasing guarantees
* should be enough though.
*/
duk_instr_t *curr_pc; /* bytecode has a stable pointer */
/* Hot variables for interpretation. Critical for performance,
* but must add sparingly to minimize register shuffling.
*/
duk_hthread *thr; /* stable */
duk_tval *consts; /* stable */
duk_tval *consts2; /* stable; precalculated for faster lookups */
duk_uint_fast32_t ins;
/* 'funcs' is quite rarely used, so no local for it */
#if defined(DUK_USE_EXEC_FUN_LOCAL)
duk_hcompiledfunction *fun;
#else
/* 'fun' is quite rarely used, so no local for it */
#endif
#ifdef DUK_USE_INTERRUPT_COUNTER
duk_int_t int_ctr;
#endif
#ifdef DUK_USE_ASSERTIONS
duk_size_t valstack_top_base; /* valstack top, should match before interpreting each op (no leftovers) */
#endif
/*
* Restart execution by reloading thread state.
*
* Note that 'thr' and any thread configuration may have changed,
* so all local variables are suspect and we need to reinitialize.
*
* The number of local variables should be kept to a minimum: if
* the variables are spilled, they will need to be loaded from
* memory anyway.
*
* Any 'goto restart_execution;' code path in opcode dispatch must
* ensure 'curr_pc' is synced back to act->curr_pc before the goto
* takes place.
*
* The interpreter must be very careful with memory pointers, as
* many pointers are not guaranteed to be 'stable' and may be
* reallocated and relocated on-the-fly quite easily (e.g. by a
* memory allocation or a property access).
*
* The following are assumed to have stable pointers:
* - the current thread
* - the current function
* - the bytecode, constant table, inner function table of the
* current function (as they are a part of the function allocation)
*
* The following are assumed to have semi-stable pointers:
* - the current activation entry: stable as long as callstack
* is not changed (reallocated by growing or shrinking), or
* by any garbage collection invocation (through finalizers)
* - Note in particular that ANY DECREF can invalidate the
* activation pointer, so for the most part a fresh lookup
* is required
*
* The following are not assumed to have stable pointers at all:
* - the value stack (registers) of the current thread
* - the catch stack of the current thread
*
* See execution.rst for discussion.
*/
restart_execution:
/* Lookup current thread; use the stable 'entry_thread' for this to
* avoid clobber warnings. Any valid, reachable 'thr' value would be
* fine for this, so using 'entry_thread' is just to silence warnings.
*/
thr = entry_thread->heap->curr_thread;
DUK_ASSERT(thr != NULL);
DUK_ASSERT(thr->callstack_top >= 1);
DUK_ASSERT(DUK_ACT_GET_FUNC(thr->callstack + thr->callstack_top - 1) != NULL);
DUK_ASSERT(DUK_HOBJECT_IS_COMPILEDFUNCTION(DUK_ACT_GET_FUNC(thr->callstack + thr->callstack_top - 1)));
thr->ptr_curr_pc = &curr_pc;
/* Relookup and initialize dispatch loop variables. Debugger check. */
{
duk_activation *act;
#if !defined(DUK_USE_EXEC_FUN_LOCAL)
duk_hcompiledfunction *fun;
#endif
/* Assume interrupt init/counter are properly initialized here. */
/* Assume that thr->valstack_bottom has been set-up before getting here. */
act = thr->callstack + thr->callstack_top - 1;
fun = (duk_hcompiledfunction *) DUK_ACT_GET_FUNC(act);
DUK_ASSERT(fun != NULL);
DUK_ASSERT(thr->valstack_top - thr->valstack_bottom == fun->nregs);
consts = DUK_HCOMPILEDFUNCTION_GET_CONSTS_BASE(thr->heap, fun);
DUK_ASSERT(consts != NULL);
consts2 = consts - DUK_BC_REGLIMIT;
#if defined(DUK_USE_DEBUGGER_SUPPORT)
if (DUK_HEAP_IS_DEBUGGER_ATTACHED(thr->heap) && !thr->heap->dbg_processing) {
duk__executor_recheck_debugger(thr, act, fun);
act = thr->callstack + thr->callstack_top - 1; /* relookup after side effects (no side effects currently however) */
}
#endif /* DUK_USE_DEBUGGER_SUPPORT */
#ifdef DUK_USE_ASSERTIONS
valstack_top_base = (duk_size_t) (thr->valstack_top - thr->valstack);
#endif
/* Set up curr_pc for opcode dispatch. */
curr_pc = act->curr_pc;
}
DUK_DD(DUK_DDPRINT("restarting execution, thr %p, act idx %ld, fun %p,"
"consts %p, funcs %p, lev %ld, regbot %ld, regtop %ld, catchstack_top=%ld, "
"preventcount=%ld",
(void *) thr,
(long) (thr->callstack_top - 1),
(void *) DUK__FUN(),
(void *) DUK_HCOMPILEDFUNCTION_GET_CONSTS_BASE(thr->heap, DUK__FUN()),
(void *) DUK_HCOMPILEDFUNCTION_GET_FUNCS_BASE(thr->heap, DUK__FUN()),
(long) (thr->callstack_top - 1),
(long) (thr->valstack_bottom - thr->valstack),
(long) (thr->valstack_top - thr->valstack),
(long) thr->catchstack_top,
(long) thr->callstack_preventcount));
/* Dispatch loop. */
for (;;) {
DUK_ASSERT(thr->callstack_top >= 1);
DUK_ASSERT(thr->valstack_top - thr->valstack_bottom == DUK__FUN()->nregs);
DUK_ASSERT((duk_size_t) (thr->valstack_top - thr->valstack) == valstack_top_base);
/* Executor interrupt counter check, used to implement breakpoints,
* debugging interface, execution timeouts, etc. The counter is heap
* specific but is maintained in the current thread to make the check
* as fast as possible. The counter is copied back to the heap struct
* whenever a thread switch occurs by the DUK_HEAP_SWITCH_THREAD() macro.
*/
#if defined(DUK_USE_INTERRUPT_COUNTER)
int_ctr = thr->interrupt_counter;
if (DUK_LIKELY(int_ctr > 0)) {
thr->interrupt_counter = int_ctr - 1;
} else {
/* Trigger at zero or below */
duk_small_uint_t exec_int_ret;
/* Write curr_pc back for the debugger. */
DUK_ASSERT(thr->callstack_top > 0);
{
duk_activation *act;
act = thr->callstack + thr->callstack_top - 1;
act->curr_pc = (duk_instr_t *) curr_pc;
}
/* Force restart caused by a function return; must recheck
* debugger breakpoints before checking line transitions,
* see GH-303. Restart and then handle interrupt_counter
* zero again.
*/
#if defined(DUK_USE_DEBUGGER_SUPPORT)
if (thr->heap->dbg_force_restart) {
DUK_DD(DUK_DDPRINT("dbg_force_restart flag forced restart execution")); /* GH-303 */
thr->heap->dbg_force_restart = 0;
goto restart_execution;
}
#endif
exec_int_ret = duk__executor_interrupt(thr);
if (exec_int_ret == DUK__INT_RESTART) {
/* curr_pc synced back above */
goto restart_execution;
}
}
#endif /* DUK_USE_INTERRUPT_COUNTER */
#if defined(DUK_USE_INTERRUPT_COUNTER) && defined(DUK_USE_DEBUG)
/* For cross-checking during development: ensure dispatch count
* matches cumulative interrupt counter init value sums.
*/
thr->heap->inst_count_exec++;
#endif
#if defined(DUK_USE_ASSERTIONS) || defined(DUK_USE_DEBUG)
{
duk_activation *act;
act = thr->callstack + thr->callstack_top - 1;
DUK_ASSERT(curr_pc >= DUK_HCOMPILEDFUNCTION_GET_CODE_BASE(thr->heap, DUK__FUN()));
DUK_ASSERT(curr_pc < DUK_HCOMPILEDFUNCTION_GET_CODE_END(thr->heap, DUK__FUN()));
DUK_UNREF(act); /* if debugging disabled */
DUK_DDD(DUK_DDDPRINT("executing bytecode: pc=%ld, ins=0x%08lx, op=%ld, valstack_top=%ld/%ld, nregs=%ld --> %!I",
(long) (curr_pc - DUK_HCOMPILEDFUNCTION_GET_CODE_BASE(thr->heap, DUK__FUN())),
(unsigned long) *curr_pc,
(long) DUK_DEC_OP(*curr_pc),
(long) (thr->valstack_top - thr->valstack),
(long) (thr->valstack_end - thr->valstack),
(long) (DUK__FUN() ? DUK__FUN()->nregs : -1),
(duk_instr_t) *curr_pc));
}
#endif
#if defined(DUK_USE_ASSERTIONS)
/* Quite heavy assert: check valstack policy. Improper
* shuffle instructions can write beyond valstack_top/end
* so this check catches them in the act.
*/
{
duk_tval *tv;
tv = thr->valstack_top;
while (tv != thr->valstack_end) {
DUK_ASSERT(DUK_TVAL_IS_UNDEFINED(tv));
tv++;
}
}
#endif
ins = *curr_pc++;
/* Typing: use duk_small_(u)int_fast_t when decoding small
* opcode fields (op, A, B, C) and duk_(u)int_fast_t when
* decoding larger fields (e.g. BC which is 18 bits). Use
* unsigned variant by default, signed when the value is used
* in signed arithmetic. Using variable names such as 'a', 'b',
* 'c', 'bc', etc makes it easier to spot typing mismatches.
*/
/* XXX: the best typing needs to be validated by perf measurement:
* e.g. using a small type which is the cast to a larger duk_idx_t
* may be slower than declaring the variable as a duk_idx_t in the
* first place.
*/
/* XXX: use macros for the repetitive tval/refcount handling. */
switch ((int) DUK_DEC_OP(ins)) {
/* XXX: switch cast? */
case DUK_OP_LDREG: {
duk_small_uint_fast_t a;
duk_uint_fast_t bc;
duk_tval *tv1, *tv2;
a = DUK_DEC_A(ins); tv1 = DUK__REGP(a);
bc = DUK_DEC_BC(ins); tv2 = DUK__REGP(bc);
DUK_TVAL_SET_TVAL_UPDREF_FAST(thr, tv1, tv2); /* side effects */
break;
}
case DUK_OP_STREG: {
duk_small_uint_fast_t a;
duk_uint_fast_t bc;
duk_tval *tv1, *tv2;
a = DUK_DEC_A(ins); tv1 = DUK__REGP(a);
bc = DUK_DEC_BC(ins); tv2 = DUK__REGP(bc);
DUK_TVAL_SET_TVAL_UPDREF_FAST(thr, tv2, tv1); /* side effects */
break;
}
case DUK_OP_LDCONST: {
duk_small_uint_fast_t a;
duk_uint_fast_t bc;
duk_tval *tv1, *tv2;
a = DUK_DEC_A(ins); tv1 = DUK__REGP(a);
bc = DUK_DEC_BC(ins); tv2 = DUK__CONSTP(bc);
DUK_TVAL_SET_TVAL_UPDREF_FAST(thr, tv1, tv2); /* side effects */
break;
}
case DUK_OP_LDINT: {
duk_small_uint_fast_t a;
duk_int_fast_t bc;
duk_tval *tv1;
#if defined(DUK_USE_FASTINT)
duk_int32_t val;
#else
duk_double_t val;
#endif
#if defined(DUK_USE_FASTINT)
a = DUK_DEC_A(ins); tv1 = DUK__REGP(a);
bc = DUK_DEC_BC(ins); val = (duk_int32_t) (bc - DUK_BC_LDINT_BIAS);
DUK_TVAL_SET_FASTINT_I32_UPDREF(thr, tv1, val); /* side effects */
#else
a = DUK_DEC_A(ins); tv1 = DUK__REGP(a);
bc = DUK_DEC_BC(ins); val = (duk_double_t) (bc - DUK_BC_LDINT_BIAS);
DUK_TVAL_SET_NUMBER_UPDREF(thr, tv1, val); /* side effects */
#endif
break;
}
case DUK_OP_LDINTX: {
duk_small_uint_fast_t a;
duk_tval *tv1;
duk_double_t val;
/* LDINTX is not necessarily in FASTINT range, so
* no fast path for now.
*
* XXX: perhaps restrict LDINTX to fastint range, wider
* range very rarely needed.
*/
a = DUK_DEC_A(ins); tv1 = DUK__REGP(a);
DUK_ASSERT(DUK_TVAL_IS_NUMBER(tv1));
val = DUK_TVAL_GET_NUMBER(tv1) * ((duk_double_t) (1L << DUK_BC_LDINTX_SHIFT)) +
(duk_double_t) DUK_DEC_BC(ins);
#if defined(DUK_USE_FASTINT)
DUK_TVAL_SET_NUMBER_CHKFAST(tv1, val);
#else
DUK_TVAL_SET_NUMBER(tv1, val);
#endif
break;
}
case DUK_OP_MPUTOBJ:
case DUK_OP_MPUTOBJI: {
duk_context *ctx = (duk_context *) thr;
duk_small_uint_fast_t a;
duk_tval *tv1;
duk_hobject *obj;
duk_uint_fast_t idx;
duk_small_uint_fast_t count;
/* A -> register of target object
* B -> first register of key/value pair list
* C -> number of key/value pairs
*/
a = DUK_DEC_A(ins); tv1 = DUK__REGP(a);
DUK_ASSERT(DUK_TVAL_IS_OBJECT(tv1));
obj = DUK_TVAL_GET_OBJECT(tv1);
idx = (duk_uint_fast_t) DUK_DEC_B(ins);
if (DUK_DEC_OP(ins) == DUK_OP_MPUTOBJI) {
duk_tval *tv_ind = DUK__REGP(idx);
DUK_ASSERT(DUK_TVAL_IS_NUMBER(tv_ind));
idx = (duk_uint_fast_t) DUK_TVAL_GET_NUMBER(tv_ind);
}
count = (duk_small_uint_fast_t) DUK_DEC_C(ins);
#if defined(DUK_USE_EXEC_INDIRECT_BOUND_CHECK)
if (DUK_UNLIKELY(idx + count * 2 > (duk_uint_fast_t) duk_get_top(ctx))) {
/* XXX: use duk_is_valid_index() instead? */
/* XXX: improve check; check against nregs, not against top */
DUK__INTERNAL_ERROR("MPUTOBJ out of bounds");
}
#endif
duk_push_hobject(ctx, obj);
while (count > 0) {
/* XXX: faster initialization (direct access or better primitives) */
duk_push_tval(ctx, DUK__REGP(idx));
DUK_ASSERT(duk_is_string(ctx, -1));
duk_push_tval(ctx, DUK__REGP(idx + 1)); /* -> [... obj key value] */
duk_xdef_prop_wec(ctx, -3); /* -> [... obj] */
count--;
idx += 2;
}
duk_pop(ctx); /* [... obj] -> [...] */
break;
}
case DUK_OP_MPUTARR:
case DUK_OP_MPUTARRI: {
duk_context *ctx = (duk_context *) thr;
duk_small_uint_fast_t a;
duk_tval *tv1;
duk_hobject *obj;
duk_uint_fast_t idx;
duk_small_uint_fast_t count;
duk_uint32_t arr_idx;
/* A -> register of target object
* B -> first register of value data (start_index, value1, value2, ..., valueN)
* C -> number of key/value pairs (N)
*/
a = DUK_DEC_A(ins); tv1 = DUK__REGP(a);
DUK_ASSERT(DUK_TVAL_IS_OBJECT(tv1));
obj = DUK_TVAL_GET_OBJECT(tv1);
DUK_ASSERT(obj != NULL);
idx = (duk_uint_fast_t) DUK_DEC_B(ins);
if (DUK_DEC_OP(ins) == DUK_OP_MPUTARRI) {
duk_tval *tv_ind = DUK__REGP(idx);
DUK_ASSERT(DUK_TVAL_IS_NUMBER(tv_ind));
idx = (duk_uint_fast_t) DUK_TVAL_GET_NUMBER(tv_ind);
}
count = (duk_small_uint_fast_t) DUK_DEC_C(ins);
#if defined(DUK_USE_EXEC_INDIRECT_BOUND_CHECK)
if (idx + count + 1 > (duk_uint_fast_t) duk_get_top(ctx)) {
/* XXX: use duk_is_valid_index() instead? */
/* XXX: improve check; check against nregs, not against top */
DUK__INTERNAL_ERROR("MPUTARR out of bounds");
}
#endif
tv1 = DUK__REGP(idx);
DUK_ASSERT(DUK_TVAL_IS_NUMBER(tv1));
arr_idx = (duk_uint32_t) DUK_TVAL_GET_NUMBER(tv1);
idx++;
duk_push_hobject(ctx, obj);
while (count > 0) {
/* duk_xdef_prop() will define an own property without any array
* special behaviors. We'll need to set the array length explicitly
* in the end. For arrays with elisions, the compiler will emit an
* explicit SETALEN which will update the length.
*/
/* XXX: because we're dealing with 'own' properties of a fresh array,
* the array initializer should just ensure that the array has a large
* enough array part and write the values directly into array part,
* and finally set 'length' manually in the end (as already happens now).
*/
duk_push_tval(ctx, DUK__REGP(idx)); /* -> [... obj value] */
duk_xdef_prop_index_wec(ctx, -2, arr_idx); /* -> [... obj] */
/* XXX: could use at least one fewer loop counters */
count--;
idx++;
arr_idx++;
}
/* XXX: E5.1 Section 11.1.4 coerces the final length through
* ToUint32() which is odd but happens now as a side effect of
* 'arr_idx' type.
*/
duk_hobject_set_length(thr, obj, (duk_uint32_t) arr_idx);
duk_pop(ctx); /* [... obj] -> [...] */
break;
}
case DUK_OP_NEW:
case DUK_OP_NEWI: {
duk_context *ctx = (duk_context *) thr;
duk_small_uint_fast_t c = DUK_DEC_C(ins);
duk_uint_fast_t idx;
duk_small_uint_fast_t i;
/* A -> unused (reserved for flags, for consistency with DUK_OP_CALL)
* B -> target register and start reg: constructor, arg1, ..., argN
* (for DUK_OP_NEWI, 'b' is indirect)
* C -> num args (N)
*/
/* duk_new() will call the constuctor using duk_handle_call().
* A constructor call prevents a yield from inside the constructor,
* even if the constructor is an Ecmascript function.
*/
/* Don't need to sync curr_pc here; duk_new() will do that
* when it augments the created error.
*/
/* XXX: unnecessary copying of values? Just set 'top' to
* b + c, and let the return handling fix up the stack frame?
*/
idx = (duk_uint_fast_t) DUK_DEC_B(ins);
if (DUK_DEC_OP(ins) == DUK_OP_NEWI) {
duk_tval *tv_ind = DUK__REGP(idx);
DUK_ASSERT(DUK_TVAL_IS_NUMBER(tv_ind));
idx = (duk_uint_fast_t) DUK_TVAL_GET_NUMBER(tv_ind);
}
#if defined(DUK_USE_EXEC_INDIRECT_BOUND_CHECK)
if (idx + c + 1 > (duk_uint_fast_t) duk_get_top(ctx)) {
/* XXX: use duk_is_valid_index() instead? */
/* XXX: improve check; check against nregs, not against top */
DUK__INTERNAL_ERROR("NEW out of bounds");
}
#endif
duk_require_stack(ctx, (duk_idx_t) c);
duk_push_tval(ctx, DUK__REGP(idx));
for (i = 0; i < c; i++) {
duk_push_tval(ctx, DUK__REGP(idx + i + 1));
}
duk_new(ctx, (duk_idx_t) c); /* [... constructor arg1 ... argN] -> [retval] */
DUK_DDD(DUK_DDDPRINT("NEW -> %!iT", (duk_tval *) duk_get_tval(ctx, -1)));
duk_replace(ctx, (duk_idx_t) idx);
/* When debugger is enabled, we need to recheck the activation
* status after returning. This is now handled by call handling
* and heap->dbg_force_restart.
*/
break;
}
case DUK_OP_REGEXP: {
#ifdef DUK_USE_REGEXP_SUPPORT
duk_context *ctx = (duk_context *) thr;
duk_small_uint_fast_t a = DUK_DEC_A(ins);
duk_small_uint_fast_t b = DUK_DEC_B(ins);
duk_small_uint_fast_t c = DUK_DEC_C(ins);
/* A -> target register
* B -> bytecode (also contains flags)
* C -> escaped source
*/
duk_push_tval(ctx, DUK__REGCONSTP(c));
duk_push_tval(ctx, DUK__REGCONSTP(b)); /* -> [ ... escaped_source bytecode ] */
duk_regexp_create_instance(thr); /* -> [ ... regexp_instance ] */
DUK_DDD(DUK_DDDPRINT("regexp instance: %!iT", (duk_tval *) duk_get_tval(ctx, -1)));
duk_replace(ctx, (duk_idx_t) a);
#else
/* The compiler should never emit DUK_OP_REGEXP if there is no
* regexp support.
*/
DUK__INTERNAL_ERROR("no regexp support");
#endif
break;
}
case DUK_OP_CSREG:
case DUK_OP_CSREGI: {
/*
* Assuming a register binds to a variable declared within this
* function (a declarative binding), the 'this' for the call
* setup is always 'undefined'. E5 Section 10.2.1.1.6.
*/
duk_context *ctx = (duk_context *) thr;
duk_small_uint_fast_t b = DUK_DEC_B(ins); /* restricted to regs */
duk_uint_fast_t idx;
/* A -> target register (A, A+1) for call setup
* (for DUK_OP_CSREGI, 'a' is indirect)
* B -> register containing target function (not type checked here)
*/
/* XXX: direct manipulation, or duk_replace_tval() */
/* Note: target registers a and a+1 may overlap with DUK__REGP(b).
* Careful here.
*/
idx = (duk_uint_fast_t) DUK_DEC_A(ins);
if (DUK_DEC_OP(ins) == DUK_OP_CSREGI) {
duk_tval *tv_ind = DUK__REGP(idx);
DUK_ASSERT(DUK_TVAL_IS_NUMBER(tv_ind));
idx = (duk_uint_fast_t) DUK_TVAL_GET_NUMBER(tv_ind);
}
#if defined(DUK_USE_EXEC_INDIRECT_BOUND_CHECK)
if (idx + 2 > (duk_uint_fast_t) duk_get_top(ctx)) {
/* XXX: use duk_is_valid_index() instead? */
/* XXX: improve check; check against nregs, not against top */
DUK__INTERNAL_ERROR("CSREG out of bounds");
}
#endif
duk_push_tval(ctx, DUK__REGP(b));
duk_replace(ctx, (duk_idx_t) idx);
duk_push_undefined(ctx);
duk_replace(ctx, (duk_idx_t) (idx + 1));
break;
}
case DUK_OP_GETVAR: {
duk_context *ctx = (duk_context *) thr;
duk_activation *act;
duk_small_uint_fast_t a = DUK_DEC_A(ins);
duk_uint_fast_t bc = DUK_DEC_BC(ins);
duk_tval *tv1;
duk_hstring *name;
tv1 = DUK__CONSTP(bc);
DUK_ASSERT(DUK_TVAL_IS_STRING(tv1));
name = DUK_TVAL_GET_STRING(tv1);
DUK_ASSERT(name != NULL);
DUK_DDD(DUK_DDDPRINT("GETVAR: '%!O'", (duk_heaphdr *) name));
act = thr->callstack + thr->callstack_top - 1;
(void) duk_js_getvar_activation(thr, act, name, 1 /*throw*/); /* -> [... val this] */
duk_pop(ctx); /* 'this' binding is not needed here */
duk_replace(ctx, (duk_idx_t) a);
break;
}
case DUK_OP_PUTVAR: {
duk_activation *act;
duk_small_uint_fast_t a = DUK_DEC_A(ins);
duk_uint_fast_t bc = DUK_DEC_BC(ins);
duk_tval *tv1;
duk_hstring *name;
tv1 = DUK__CONSTP(bc);
DUK_ASSERT(DUK_TVAL_IS_STRING(tv1));
name = DUK_TVAL_GET_STRING(tv1);
DUK_ASSERT(name != NULL);
/* XXX: putvar takes a duk_tval pointer, which is awkward and
* should be reworked.
*/
tv1 = DUK__REGP(a); /* val */
act = thr->callstack + thr->callstack_top - 1;
duk_js_putvar_activation(thr, act, name, tv1, DUK__STRICT());
break;
}
case DUK_OP_DECLVAR: {
duk_activation *act;
duk_context *ctx = (duk_context *) thr;
duk_small_uint_fast_t a = DUK_DEC_A(ins);
duk_small_uint_fast_t b = DUK_DEC_B(ins);
duk_small_uint_fast_t c = DUK_DEC_C(ins);
duk_tval *tv1;
duk_hstring *name;
duk_small_uint_t prop_flags;
duk_bool_t is_func_decl;
duk_bool_t is_undef_value;
tv1 = DUK__REGCONSTP(b);
DUK_ASSERT(DUK_TVAL_IS_STRING(tv1));
name = DUK_TVAL_GET_STRING(tv1);
DUK_ASSERT(name != NULL);
is_undef_value = ((a & DUK_BC_DECLVAR_FLAG_UNDEF_VALUE) != 0);
is_func_decl = ((a & DUK_BC_DECLVAR_FLAG_FUNC_DECL) != 0);
/* XXX: declvar takes an duk_tval pointer, which is awkward and
* should be reworked.
*/
/* Compiler is responsible for selecting property flags (configurability,
* writability, etc).
*/
prop_flags = a & DUK_PROPDESC_FLAGS_MASK;
if (is_undef_value) {
duk_push_undefined(ctx);
} else {
duk_push_tval(ctx, DUK__REGCONSTP(c));
}
tv1 = DUK_GET_TVAL_NEGIDX(ctx, -1);
act = thr->callstack + thr->callstack_top - 1;
if (duk_js_declvar_activation(thr, act, name, tv1, prop_flags, is_func_decl)) {
/* already declared, must update binding value */
tv1 = DUK_GET_TVAL_NEGIDX(ctx, -1);
duk_js_putvar_activation(thr, act, name, tv1, DUK__STRICT());
}
duk_pop(ctx);
break;
}
case DUK_OP_DELVAR: {
duk_activation *act;
duk_context *ctx = (duk_context *) thr;
duk_small_uint_fast_t a = DUK_DEC_A(ins);
duk_small_uint_fast_t b = DUK_DEC_B(ins);
duk_tval *tv1;
duk_hstring *name;
duk_bool_t rc;
tv1 = DUK__REGCONSTP(b);
DUK_ASSERT(DUK_TVAL_IS_STRING(tv1));
name = DUK_TVAL_GET_STRING(tv1);
DUK_ASSERT(name != NULL);
DUK_DDD(DUK_DDDPRINT("DELVAR '%!O'", (duk_heaphdr *) name));
act = thr->callstack + thr->callstack_top - 1;
rc = duk_js_delvar_activation(thr, act, name);
duk_push_boolean(ctx, rc);
duk_replace(ctx, (duk_idx_t) a);
break;
}
case DUK_OP_CSVAR:
case DUK_OP_CSVARI: {
/* 'this' value:
* E5 Section 6.b.i
*
* The only (standard) case where the 'this' binding is non-null is when
* (1) the variable is found in an object environment record, and
* (2) that object environment record is a 'with' block.
*
*/
duk_context *ctx = (duk_context *) thr;
duk_activation *act;
duk_small_uint_fast_t b = DUK_DEC_B(ins);
duk_uint_fast_t idx;
duk_tval *tv1;
duk_hstring *name;
tv1 = DUK__REGCONSTP(b);
DUK_ASSERT(DUK_TVAL_IS_STRING(tv1));
name = DUK_TVAL_GET_STRING(tv1);
DUK_ASSERT(name != NULL);
act = thr->callstack + thr->callstack_top - 1;
(void) duk_js_getvar_activation(thr, act, name, 1 /*throw*/); /* -> [... val this] */
/* Note: target registers a and a+1 may overlap with DUK__REGCONSTP(b)
* and DUK__REGCONSTP(c). Careful here.
*/
idx = (duk_uint_fast_t) DUK_DEC_A(ins);
if (DUK_DEC_OP(ins) == DUK_OP_CSVARI) {
duk_tval *tv_ind = DUK__REGP(idx);
DUK_ASSERT(DUK_TVAL_IS_NUMBER(tv_ind));
idx = (duk_uint_fast_t) DUK_TVAL_GET_NUMBER(tv_ind);
}
#if defined(DUK_USE_EXEC_INDIRECT_BOUND_CHECK)
if (idx + 2 > (duk_uint_fast_t) duk_get_top(ctx)) {
/* XXX: use duk_is_valid_index() instead? */
/* XXX: improve check; check against nregs, not against top */
DUK__INTERNAL_ERROR("CSVAR out of bounds");
}
#endif
duk_replace(ctx, (duk_idx_t) (idx + 1)); /* 'this' binding */
duk_replace(ctx, (duk_idx_t) idx); /* variable value (function, we hope, not checked here) */
break;
}
case DUK_OP_CLOSURE: {
duk_context *ctx = (duk_context *) thr;
duk_activation *act;
duk_hcompiledfunction *fun;
duk_small_uint_fast_t a = DUK_DEC_A(ins);
duk_uint_fast_t bc = DUK_DEC_BC(ins);
duk_hobject *fun_temp;
/* A -> target reg
* BC -> inner function index
*/
DUK_DDD(DUK_DDDPRINT("CLOSURE to target register %ld, fnum %ld (count %ld)",
(long) a, (long) bc, (long) DUK_HCOMPILEDFUNCTION_GET_FUNCS_COUNT(thr->heap, DUK__FUN())));
DUK_ASSERT_DISABLE(bc >= 0); /* unsigned */
DUK_ASSERT((duk_uint_t) bc < (duk_uint_t) DUK_HCOMPILEDFUNCTION_GET_FUNCS_COUNT(thr->heap, DUK__FUN()));
act = thr->callstack + thr->callstack_top - 1;
fun = (duk_hcompiledfunction *) DUK_ACT_GET_FUNC(act);
fun_temp = DUK_HCOMPILEDFUNCTION_GET_FUNCS_BASE(thr->heap, fun)[bc];
DUK_ASSERT(fun_temp != NULL);
DUK_ASSERT(DUK_HOBJECT_IS_COMPILEDFUNCTION(fun_temp));
DUK_DDD(DUK_DDDPRINT("CLOSURE: function template is: %p -> %!O",
(void *) fun_temp, (duk_heaphdr *) fun_temp));
if (act->lex_env == NULL) {
DUK_ASSERT(act->var_env == NULL);
duk_js_init_activation_environment_records_delayed(thr, act);
}
DUK_ASSERT(act->lex_env != NULL);
DUK_ASSERT(act->var_env != NULL);
/* functions always have a NEWENV flag, i.e. they get a
* new variable declaration environment, so only lex_env
* matters here.
*/
duk_js_push_closure(thr,
(duk_hcompiledfunction *) fun_temp,
act->var_env,
act->lex_env,
1 /*add_auto_proto*/);
duk_replace(ctx, (duk_idx_t) a);
break;
}
case DUK_OP_GETPROP: {
duk_context *ctx = (duk_context *) thr;
duk_small_uint_fast_t a = DUK_DEC_A(ins);
duk_small_uint_fast_t b = DUK_DEC_B(ins);
duk_small_uint_fast_t c = DUK_DEC_C(ins);
duk_tval *tv_obj;
duk_tval *tv_key;
duk_bool_t rc;
/* A -> target reg
* B -> object reg/const (may be const e.g. in "'foo'[1]")
* C -> key reg/const
*/
tv_obj = DUK__REGCONSTP(b);
tv_key = DUK__REGCONSTP(c);
DUK_DDD(DUK_DDDPRINT("GETPROP: a=%ld obj=%!T, key=%!T",
(long) a,
(duk_tval *) DUK__REGCONSTP(b),
(duk_tval *) DUK__REGCONSTP(c)));
rc = duk_hobject_getprop(thr, tv_obj, tv_key); /* -> [val] */
DUK_UNREF(rc); /* ignore */
DUK_DDD(DUK_DDDPRINT("GETPROP --> %!T",
(duk_tval *) duk_get_tval(ctx, -1)));
tv_obj = NULL; /* invalidated */
tv_key = NULL; /* invalidated */
duk_replace(ctx, (duk_idx_t) a); /* val */
break;
}
case DUK_OP_PUTPROP: {
duk_small_uint_fast_t a = DUK_DEC_A(ins);
duk_small_uint_fast_t b = DUK_DEC_B(ins);
duk_small_uint_fast_t c = DUK_DEC_C(ins);
duk_tval *tv_obj;
duk_tval *tv_key;
duk_tval *tv_val;
duk_bool_t rc;
/* A -> object reg
* B -> key reg/const
* C -> value reg/const
*
* Note: intentional difference to register arrangement
* of e.g. GETPROP; 'A' must contain a register-only value.
*/
tv_obj = DUK__REGP(a);
tv_key = DUK__REGCONSTP(b);
tv_val = DUK__REGCONSTP(c);
DUK_DDD(DUK_DDDPRINT("PUTPROP: obj=%!T, key=%!T, val=%!T",
(duk_tval *) DUK__REGP(a),
(duk_tval *) DUK__REGCONSTP(b),
(duk_tval *) DUK__REGCONSTP(c)));
rc = duk_hobject_putprop(thr, tv_obj, tv_key, tv_val, DUK__STRICT());
DUK_UNREF(rc); /* ignore */
DUK_DDD(DUK_DDDPRINT("PUTPROP --> obj=%!T, key=%!T, val=%!T",
(duk_tval *) DUK__REGP(a),
(duk_tval *) DUK__REGCONSTP(b),
(duk_tval *) DUK__REGCONSTP(c)));
tv_obj = NULL; /* invalidated */
tv_key = NULL; /* invalidated */
tv_val = NULL; /* invalidated */
break;
}
case DUK_OP_DELPROP: {
duk_context *ctx = (duk_context *) thr;
duk_small_uint_fast_t a = DUK_DEC_A(ins);
duk_small_uint_fast_t b = DUK_DEC_B(ins);
duk_small_uint_fast_t c = DUK_DEC_C(ins);
duk_tval *tv_obj;
duk_tval *tv_key;
duk_bool_t rc;
/* A -> result reg
* B -> object reg
* C -> key reg/const
*/
tv_obj = DUK__REGP(b);
tv_key = DUK__REGCONSTP(c);
rc = duk_hobject_delprop(thr, tv_obj, tv_key, DUK__STRICT());
tv_obj = NULL; /* invalidated */
tv_key = NULL; /* invalidated */
duk_push_boolean(ctx, rc);
duk_replace(ctx, (duk_idx_t) a); /* result */
break;
}
case DUK_OP_CSPROP:
case DUK_OP_CSPROPI: {
duk_context *ctx = (duk_context *) thr;
duk_small_uint_fast_t b = DUK_DEC_B(ins);
duk_small_uint_fast_t c = DUK_DEC_C(ins);
duk_uint_fast_t idx;
duk_tval *tv_obj;
duk_tval *tv_key;
duk_bool_t rc;
/* E5 Section 11.2.3, step 6.a.i */
/* E5 Section 10.4.3 */
/* XXX: allow object to be a const, e.g. in 'foo'.toString()?
* On the other hand, DUK_REGCONSTP() is slower and generates
* more code.
*/
tv_obj = DUK__REGP(b);
tv_key = DUK__REGCONSTP(c);
rc = duk_hobject_getprop(thr, tv_obj, tv_key); /* -> [val] */
DUK_UNREF(rc); /* unused */
tv_obj = NULL; /* invalidated */
tv_key = NULL; /* invalidated */
/* Note: target registers a and a+1 may overlap with DUK__REGP(b)
* and DUK__REGCONSTP(c). Careful here.
*/
idx = (duk_uint_fast_t) DUK_DEC_A(ins);
if (DUK_DEC_OP(ins) == DUK_OP_CSPROPI) {
duk_tval *tv_ind = DUK__REGP(idx);
DUK_ASSERT(DUK_TVAL_IS_NUMBER(tv_ind));
idx = (duk_uint_fast_t) DUK_TVAL_GET_NUMBER(tv_ind);
}
#if defined(DUK_USE_EXEC_INDIRECT_BOUND_CHECK)
if (idx + 2 > (duk_uint_fast_t) duk_get_top(ctx)) {
/* XXX: use duk_is_valid_index() instead? */
/* XXX: improve check; check against nregs, not against top */
DUK__INTERNAL_ERROR("CSPROP out of bounds");
}
#endif
duk_push_tval(ctx, DUK__REGP(b)); /* [ ... val obj ] */
duk_replace(ctx, (duk_idx_t) (idx + 1)); /* 'this' binding */
duk_replace(ctx, (duk_idx_t) idx); /* val */
break;
}
case DUK_OP_ADD:
case DUK_OP_SUB:
case DUK_OP_MUL:
case DUK_OP_DIV:
case DUK_OP_MOD: {
duk_small_uint_fast_t a = DUK_DEC_A(ins);
duk_small_uint_fast_t b = DUK_DEC_B(ins);
duk_small_uint_fast_t c = DUK_DEC_C(ins);
duk_small_uint_fast_t op = DUK_DEC_OP(ins);
if (op == DUK_OP_ADD) {
/*
* Handling DUK_OP_ADD this way is more compact (experimentally)
* than a separate case with separate argument decoding.
*/
duk__vm_arith_add(thr, DUK__REGCONSTP(b), DUK__REGCONSTP(c), a);
} else {
duk__vm_arith_binary_op(thr, DUK__REGCONSTP(b), DUK__REGCONSTP(c), a, op);
}
break;
}
case DUK_OP_BAND:
case DUK_OP_BOR:
case DUK_OP_BXOR:
case DUK_OP_BASL:
case DUK_OP_BLSR:
case DUK_OP_BASR: {
duk_small_uint_fast_t a = DUK_DEC_A(ins);
duk_small_uint_fast_t b = DUK_DEC_B(ins);
duk_small_uint_fast_t c = DUK_DEC_C(ins);
duk_small_uint_fast_t op = DUK_DEC_OP(ins);
duk__vm_bitwise_binary_op(thr, DUK__REGCONSTP(b), DUK__REGCONSTP(c), a, op);
break;
}
case DUK_OP_EQ:
case DUK_OP_NEQ: {
duk_context *ctx = (duk_context *) thr;
duk_small_uint_fast_t a = DUK_DEC_A(ins);
duk_small_uint_fast_t b = DUK_DEC_B(ins);
duk_small_uint_fast_t c = DUK_DEC_C(ins);
duk_bool_t tmp;
/* E5 Sections 11.9.1, 11.9.3 */
tmp = duk_js_equals(thr, DUK__REGCONSTP(b), DUK__REGCONSTP(c));
if (DUK_DEC_OP(ins) == DUK_OP_NEQ) {
tmp = !tmp;
}
duk_push_boolean(ctx, tmp);
duk_replace(ctx, (duk_idx_t) a);
break;
}
case DUK_OP_SEQ:
case DUK_OP_SNEQ: {
duk_context *ctx = (duk_context *) thr;
duk_small_uint_fast_t a = DUK_DEC_A(ins);
duk_small_uint_fast_t b = DUK_DEC_B(ins);
duk_small_uint_fast_t c = DUK_DEC_C(ins);
duk_bool_t tmp;
/* E5 Sections 11.9.1, 11.9.3 */
tmp = duk_js_strict_equals(DUK__REGCONSTP(b), DUK__REGCONSTP(c));
if (DUK_DEC_OP(ins) == DUK_OP_SNEQ) {
tmp = !tmp;
}
duk_push_boolean(ctx, tmp);
duk_replace(ctx, (duk_idx_t) a);
break;
}
/* Note: combining comparison ops must be done carefully because
* of uncomparable values (NaN): it's not necessarily true that
* (x >= y) === !(x < y). Also, evaluation order matters, and
* although it would only seem to affect the compiler this is
* actually not the case, because there are also run-time coercions
* of the arguments (with potential side effects).
*
* XXX: can be combined; check code size.
*/
case DUK_OP_GT: {
duk_context *ctx = (duk_context *) thr;
duk_small_uint_fast_t a = DUK_DEC_A(ins);
duk_small_uint_fast_t b = DUK_DEC_B(ins);
duk_small_uint_fast_t c = DUK_DEC_C(ins);
duk_bool_t tmp;
/* x > y --> y < x */
tmp = duk_js_compare_helper(thr,
DUK__REGCONSTP(c), /* y */
DUK__REGCONSTP(b), /* x */
0); /* flags */
duk_push_boolean(ctx, tmp);
duk_replace(ctx, (duk_idx_t) a);
break;
}
case DUK_OP_GE: {
duk_context *ctx = (duk_context *) thr;
duk_small_uint_fast_t a = DUK_DEC_A(ins);
duk_small_uint_fast_t b = DUK_DEC_B(ins);
duk_small_uint_fast_t c = DUK_DEC_C(ins);
duk_bool_t tmp;
/* x >= y --> not (x < y) */
tmp = duk_js_compare_helper(thr,
DUK__REGCONSTP(b), /* x */
DUK__REGCONSTP(c), /* y */
DUK_COMPARE_FLAG_EVAL_LEFT_FIRST |
DUK_COMPARE_FLAG_NEGATE); /* flags */
duk_push_boolean(ctx, tmp);
duk_replace(ctx, (duk_idx_t) a);
break;
}
case DUK_OP_LT: {
duk_context *ctx = (duk_context *) thr;
duk_small_uint_fast_t a = DUK_DEC_A(ins);
duk_small_uint_fast_t b = DUK_DEC_B(ins);
duk_small_uint_fast_t c = DUK_DEC_C(ins);
duk_bool_t tmp;
/* x < y */
tmp = duk_js_compare_helper(thr,
DUK__REGCONSTP(b), /* x */
DUK__REGCONSTP(c), /* y */
DUK_COMPARE_FLAG_EVAL_LEFT_FIRST); /* flags */
duk_push_boolean(ctx, tmp);
duk_replace(ctx, (duk_idx_t) a);
break;
}
case DUK_OP_LE: {
duk_context *ctx = (duk_context *) thr;
duk_small_uint_fast_t a = DUK_DEC_A(ins);
duk_small_uint_fast_t b = DUK_DEC_B(ins);
duk_small_uint_fast_t c = DUK_DEC_C(ins);
duk_bool_t tmp;
/* x <= y --> not (x > y) --> not (y < x) */
tmp = duk_js_compare_helper(thr,
DUK__REGCONSTP(c), /* y */
DUK__REGCONSTP(b), /* x */
DUK_COMPARE_FLAG_NEGATE); /* flags */
duk_push_boolean(ctx, tmp);
duk_replace(ctx, (duk_idx_t) a);
break;
}
case DUK_OP_IF: {
duk_small_uint_fast_t a = DUK_DEC_A(ins);
duk_small_uint_fast_t b = DUK_DEC_B(ins);
duk_bool_t tmp;
tmp = duk_js_toboolean(DUK__REGCONSTP(b));
if (tmp == (duk_bool_t) a) {
/* if boolean matches A, skip next inst */
curr_pc++;
} else {
;
}
break;
}
case DUK_OP_JUMP: {
duk_int_fast_t abc = DUK_DEC_ABC(ins);
curr_pc += abc - DUK_BC_JUMP_BIAS;
break;
}
case DUK_OP_RETURN: {
duk_context *ctx = (duk_context *) thr;
duk_small_uint_fast_t a = DUK_DEC_A(ins);
duk_small_uint_fast_t b = DUK_DEC_B(ins);
/* duk_small_uint_fast_t c = DUK_DEC_C(ins); */
duk_small_uint_t ret_result;
/* A -> flags
* B -> return value reg/const
* C -> currently unused
*/
DUK__SYNC_AND_NULL_CURR_PC();
/* duk__handle_return() is guaranteed never to throw, except
* for potential out-of-memory situations which will then
* propagate out of the executor longjmp handler.
*/
if (a & DUK_BC_RETURN_FLAG_HAVE_RETVAL) {
duk_push_tval(ctx, DUK__REGCONSTP(b));
} else {
duk_push_undefined(ctx);
}
ret_result = duk__handle_return(thr,
entry_thread,
entry_callstack_top);
if (ret_result == DUK__RETHAND_RESTART) {
goto restart_execution;
}
DUK_ASSERT(ret_result == DUK__RETHAND_FINISHED);
DUK_DDD(DUK_DDDPRINT("exiting executor after RETURN handling"));
return;
}
case DUK_OP_CALL:
case DUK_OP_CALLI: {
duk_context *ctx = (duk_context *) thr;
duk_small_uint_fast_t a = DUK_DEC_A(ins);
duk_small_uint_fast_t c = DUK_DEC_C(ins);
duk_uint_fast_t idx;
duk_small_uint_t call_flags;
duk_small_uint_t flag_tailcall;
duk_small_uint_t flag_evalcall;
duk_tval *tv_func;
duk_hobject *obj_func;
duk_bool_t setup_rc;
duk_idx_t num_stack_args;
#if !defined(DUK_USE_EXEC_FUN_LOCAL)
duk_hcompiledfunction *fun;
#endif
/* A -> flags
* B -> base register for call (base -> func, base+1 -> this, base+2 -> arg1 ... base+2+N-1 -> argN)
* (for DUK_OP_CALLI, 'b' is indirect)
* C -> nargs
*/
/* these are not necessarily 0 or 1 (may be other non-zero), that's ok */
flag_tailcall = (a & DUK_BC_CALL_FLAG_TAILCALL);
flag_evalcall = (a & DUK_BC_CALL_FLAG_EVALCALL);
idx = (duk_uint_fast_t) DUK_DEC_B(ins);
if (DUK_DEC_OP(ins) == DUK_OP_CALLI) {
duk_tval *tv_ind = DUK__REGP(idx);
DUK_ASSERT(DUK_TVAL_IS_NUMBER(tv_ind));
idx = (duk_uint_fast_t) DUK_TVAL_GET_NUMBER(tv_ind);
}
#if defined(DUK_USE_EXEC_INDIRECT_BOUND_CHECK)
if (!duk_is_valid_index(ctx, (duk_idx_t) idx)) {
/* XXX: improve check; check against nregs, not against top */
DUK__INTERNAL_ERROR("CALL out of bounds");
}
#endif
/*
* To determine whether to use an optimized Ecmascript-to-Ecmascript
* call, we need to know whether the final, non-bound function is an
* Ecmascript function.
*
* This is now implemented so that we start to do an ecma-to-ecma call
* setup which will resolve the bound chain as the first thing. If the
* final function is not eligible, the return value indicates that the
* ecma-to-ecma call is not possible. The setup will overwrite the call
* target at DUK__REGP(idx) with the final, non-bound function (which
* may be a lightfunc), and fudge arguments if necessary.
*
* XXX: If an ecma-to-ecma call is not possible, this initial call
* setup will do bound function chain resolution but won't do the
* "effective this binding" resolution which is quite confusing.
* Perhaps add a helper for doing bound function and effective this
* binding resolution - and call that explicitly? Ecma-to-ecma call
* setup and normal function handling can then assume this prestep has
* been done by the caller.
*/
duk_set_top(ctx, (duk_idx_t) (idx + c + 2)); /* [ ... func this arg1 ... argN ] */
call_flags = 0;
if (flag_tailcall) {
/* We request a tail call, but in some corner cases
* call handling can decide that a tail call is
* actually not possible.
* See: test-bug-tailcall-preventyield-assert.c.
*/
call_flags |= DUK_CALL_FLAG_IS_TAILCALL;
}
/* Compared to duk_handle_call():
* - protected call: never
* - ignore recursion limit: never
*/
num_stack_args = c;
setup_rc = duk_handle_ecma_call_setup(thr,
num_stack_args,
call_flags);
if (setup_rc) {
/* Ecma-to-ecma call possible, may or may not be a tail call.
* Avoid C recursion by being clever.
*/
DUK_DDD(DUK_DDDPRINT("ecma-to-ecma call setup possible, restart execution"));
/* curr_pc synced by duk_handle_ecma_call_setup() */
goto restart_execution;
}
DUK_ASSERT(thr->ptr_curr_pc != NULL); /* restored if ecma-to-ecma setup fails */
DUK_DDD(DUK_DDDPRINT("ecma-to-ecma call not possible, target is native (may be lightfunc)"));
/* Recompute argument count: bound function handling may have shifted. */
num_stack_args = duk_get_top(ctx) - (idx + 2);
DUK_DDD(DUK_DDDPRINT("recomputed arg count: %ld\n", (long) num_stack_args));
tv_func = DUK__REGP(idx); /* Relookup if relocated */
if (DUK_TVAL_IS_LIGHTFUNC(tv_func)) {
call_flags = 0; /* not protected, respect reclimit, not constructor */
/* There is no eval() special handling here: eval() is never
* automatically converted to a lightfunc.
*/
DUK_ASSERT(DUK_TVAL_GET_LIGHTFUNC_FUNCPTR(tv_func) != duk_bi_global_object_eval);
duk_handle_call_unprotected(thr,
num_stack_args,
call_flags);
/* duk_js_call.c is required to restore the stack reserve
* so we only need to reset the top.
*/
#if !defined(DUK_USE_EXEC_FUN_LOCAL)
fun = DUK__FUN();
#endif
duk_set_top(ctx, (duk_idx_t) fun->nregs);
/* No need to reinit setjmp() catchpoint, as call handling
* will store and restore our state.
*/
} else {
/* Call setup checks callability. */
DUK_ASSERT(DUK_TVAL_IS_OBJECT(tv_func));
obj_func = DUK_TVAL_GET_OBJECT(tv_func);
DUK_ASSERT(obj_func != NULL);
DUK_ASSERT(!DUK_HOBJECT_HAS_BOUND(obj_func));
/*
* Other cases, use C recursion.
*
* If a tail call was requested we ignore it and execute a normal call.
* Since Duktape 0.11.0 the compiler emits a RETURN opcode even after
* a tail call to avoid test-bug-tailcall-thread-yield-resume.js.
*
* Direct eval call: (1) call target (before following bound function
* chain) is the built-in eval() function, and (2) call was made with
* the identifier 'eval'.
*/
call_flags = 0; /* not protected, respect reclimit, not constructor */
if (DUK_HOBJECT_IS_NATIVEFUNCTION(obj_func) &&
((duk_hnativefunction *) obj_func)->func == duk_bi_global_object_eval) {
if (flag_evalcall) {
DUK_DDD(DUK_DDDPRINT("call target is eval, call identifier was 'eval' -> direct eval"));
call_flags |= DUK_CALL_FLAG_DIRECT_EVAL;
} else {
DUK_DDD(DUK_DDDPRINT("call target is eval, call identifier was not 'eval' -> indirect eval"));
}
}
duk_handle_call_unprotected(thr,
num_stack_args,
call_flags);
/* duk_js_call.c is required to restore the stack reserve
* so we only need to reset the top.
*/
#if !defined(DUK_USE_EXEC_FUN_LOCAL)
fun = DUK__FUN();
#endif
duk_set_top(ctx, (duk_idx_t) fun->nregs);
/* No need to reinit setjmp() catchpoint, as call handling
* will store and restore our state.
*/
}
/* When debugger is enabled, we need to recheck the activation
* status after returning. This is now handled by call handling
* and heap->dbg_force_restart.
*/
break;
}
case DUK_OP_TRYCATCH: {
duk_context *ctx = (duk_context *) thr;
duk_activation *act;
duk_catcher *cat;
duk_tval *tv1;
duk_small_uint_fast_t a;
duk_uint_fast_t bc;
/* A -> flags
* BC -> reg_catch; base register for two registers used both during
* trycatch setup and when catch is triggered
*
* If DUK_BC_TRYCATCH_FLAG_CATCH_BINDING set:
* reg_catch + 0: catch binding variable name (string).
* Automatic declarative environment is established for
* the duration of the 'catch' clause.
*
* If DUK_BC_TRYCATCH_FLAG_WITH_BINDING set:
* reg_catch + 0: with 'target value', which is coerced to
* an object and then used as a bindind object for an
* environment record. The binding is initialized here, for
* the 'try' clause.
*
* Note that a TRYCATCH generated for a 'with' statement has no
* catch or finally parts.
*/
/* XXX: TRYCATCH handling should be reworked to avoid creating
* an explicit scope unless it is actually needed (e.g. function
* instances or eval is executed inside the catch block). This
* rework is not trivial because the compiler doesn't have an
* intermediate representation. When the rework is done, the
* opcode format can also be made more straightforward.
*/
/* XXX: side effect handling is quite awkward here */
DUK_DDD(DUK_DDDPRINT("TRYCATCH: reg_catch=%ld, have_catch=%ld, "
"have_finally=%ld, catch_binding=%ld, with_binding=%ld (flags=0x%02lx)",
(long) DUK_DEC_BC(ins),
(long) (DUK_DEC_A(ins) & DUK_BC_TRYCATCH_FLAG_HAVE_CATCH ? 1 : 0),
(long) (DUK_DEC_A(ins) & DUK_BC_TRYCATCH_FLAG_HAVE_FINALLY ? 1 : 0),
(long) (DUK_DEC_A(ins) & DUK_BC_TRYCATCH_FLAG_CATCH_BINDING ? 1 : 0),
(long) (DUK_DEC_A(ins) & DUK_BC_TRYCATCH_FLAG_WITH_BINDING ? 1 : 0),
(unsigned long) DUK_DEC_A(ins)));
a = DUK_DEC_A(ins);
bc = DUK_DEC_BC(ins);
act = thr->callstack + thr->callstack_top - 1;
DUK_ASSERT(thr->callstack_top >= 1);
/* 'with' target must be created first, in case we run out of memory */
/* XXX: refactor out? */
if (a & DUK_BC_TRYCATCH_FLAG_WITH_BINDING) {
DUK_DDD(DUK_DDDPRINT("need to initialize a with binding object"));
if (act->lex_env == NULL) {
DUK_ASSERT(act->var_env == NULL);
DUK_DDD(DUK_DDDPRINT("delayed environment initialization"));
/* must relookup act in case of side effects */
duk_js_init_activation_environment_records_delayed(thr, act);
act = thr->callstack + thr->callstack_top - 1;
DUK_UNREF(act); /* 'act' is no longer accessed, scanbuild fix */
}
DUK_ASSERT(act->lex_env != NULL);
DUK_ASSERT(act->var_env != NULL);
(void) duk_push_object_helper(ctx,
DUK_HOBJECT_FLAG_EXTENSIBLE |
DUK_HOBJECT_CLASS_AS_FLAGS(DUK_HOBJECT_CLASS_OBJENV),
-1); /* no prototype, updated below */
duk_push_tval(ctx, DUK__REGP(bc));
duk_to_object(ctx, -1);
duk_dup(ctx, -1);
/* [ ... env target ] */
/* [ ... env target target ] */
duk_xdef_prop_stridx(thr, -3, DUK_STRIDX_INT_TARGET, DUK_PROPDESC_FLAGS_NONE);
duk_xdef_prop_stridx(thr, -2, DUK_STRIDX_INT_THIS, DUK_PROPDESC_FLAGS_NONE); /* always provideThis=true */
/* [ ... env ] */
DUK_DDD(DUK_DDDPRINT("environment for with binding: %!iT",
(duk_tval *) duk_get_tval(ctx, -1)));
}
/* allocate catcher and populate it (should be atomic) */
duk_hthread_catchstack_grow(thr);
cat = thr->catchstack + thr->catchstack_top;
DUK_ASSERT(thr->catchstack_top + 1 <= thr->catchstack_size);
thr->catchstack_top++;
cat->flags = DUK_CAT_TYPE_TCF;
cat->h_varname = NULL;
if (a & DUK_BC_TRYCATCH_FLAG_HAVE_CATCH) {
cat->flags |= DUK_CAT_FLAG_CATCH_ENABLED;
}
if (a & DUK_BC_TRYCATCH_FLAG_HAVE_FINALLY) {
cat->flags |= DUK_CAT_FLAG_FINALLY_ENABLED;
}
if (a & DUK_BC_TRYCATCH_FLAG_CATCH_BINDING) {
DUK_DDD(DUK_DDDPRINT("catch binding flag set to catcher"));
cat->flags |= DUK_CAT_FLAG_CATCH_BINDING_ENABLED;
tv1 = DUK__REGP(bc);
DUK_ASSERT(DUK_TVAL_IS_STRING(tv1));
/* borrowed reference; although 'tv1' comes from a register,
* its value was loaded using LDCONST so the constant will
* also exist and be reachable.
*/
cat->h_varname = DUK_TVAL_GET_STRING(tv1);
} else if (a & DUK_BC_TRYCATCH_FLAG_WITH_BINDING) {
/* env created above to stack top */
duk_hobject *new_env;
DUK_DDD(DUK_DDDPRINT("lexenv active flag set to catcher"));
cat->flags |= DUK_CAT_FLAG_LEXENV_ACTIVE;
DUK_DDD(DUK_DDDPRINT("activating object env: %!iT",
(duk_tval *) duk_get_tval(ctx, -1)));
DUK_ASSERT(act->lex_env != NULL);
new_env = DUK_GET_HOBJECT_NEGIDX(ctx, -1);
DUK_ASSERT(new_env != NULL);
act = thr->callstack + thr->callstack_top - 1; /* relookup (side effects) */
DUK_HOBJECT_SET_PROTOTYPE_UPDREF(thr, new_env, act->lex_env); /* side effects */
act = thr->callstack + thr->callstack_top - 1; /* relookup (side effects) */
act->lex_env = new_env;
DUK_HOBJECT_INCREF(thr, new_env);
duk_pop(ctx);
} else {
;
}
/* Registers 'bc' and 'bc + 1' are written in longjmp handling
* and if their previous values (which are temporaries) become
* unreachable -and- have a finalizer, there'll be a function
* call during error handling which is not supported now (GH-287).
* Ensure that both 'bc' and 'bc + 1' have primitive values to
* guarantee no finalizer calls in error handling. Scrubbing also
* ensures finalizers for the previous values run here rather than
* later. Error handling related values are also written to 'bc'
* and 'bc + 1' but those values never become unreachable during
* error handling, so there's no side effect problem even if the
* error value has a finalizer.
*/
duk_to_undefined(ctx, bc);
duk_to_undefined(ctx, bc + 1);
cat = thr->catchstack + thr->catchstack_top - 1; /* relookup (side effects) */
cat->callstack_index = thr->callstack_top - 1;
cat->pc_base = (duk_instr_t *) curr_pc; /* pre-incremented, points to first jump slot */
cat->idx_base = (duk_size_t) (thr->valstack_bottom - thr->valstack) + bc;
DUK_DDD(DUK_DDDPRINT("TRYCATCH catcher: flags=0x%08lx, callstack_index=%ld, pc_base=%ld, "
"idx_base=%ld, h_varname=%!O",
(unsigned long) cat->flags, (long) cat->callstack_index,
(long) cat->pc_base, (long) cat->idx_base, (duk_heaphdr *) cat->h_varname));
curr_pc += 2; /* skip jump slots */
break;
}
/* Pre/post inc/dec for register variables, important for loops. */
case DUK_OP_PREINCR:
case DUK_OP_PREDECR:
case DUK_OP_POSTINCR:
case DUK_OP_POSTDECR: {
duk_context *ctx = (duk_context *) thr;
duk_small_uint_fast_t a = DUK_DEC_A(ins);
duk_uint_fast_t bc = DUK_DEC_BC(ins);
duk_tval *tv1, *tv2;
duk_double_t x, y, z;
/* Two lowest bits of opcode are used to distinguish
* variants. Bit 0 = inc(0)/dec(1), bit 1 = pre(0)/post(1).
*/
DUK_ASSERT((DUK_OP_PREINCR & 0x03) == 0x00);
DUK_ASSERT((DUK_OP_PREDECR & 0x03) == 0x01);
DUK_ASSERT((DUK_OP_POSTINCR & 0x03) == 0x02);
DUK_ASSERT((DUK_OP_POSTDECR & 0x03) == 0x03);
tv1 = DUK__REGP(bc);
#if defined(DUK_USE_FASTINT)
if (DUK_TVAL_IS_FASTINT(tv1)) {
duk_int64_t x_fi, y_fi, z_fi;
x_fi = DUK_TVAL_GET_FASTINT(tv1);
if (ins & DUK_ENC_OP(0x01)) {
if (x_fi == DUK_FASTINT_MIN) {
goto skip_fastint;
}
y_fi = x_fi - 1;
} else {
if (x_fi == DUK_FASTINT_MAX) {
goto skip_fastint;
}
y_fi = x_fi + 1;
}
DUK_TVAL_SET_FASTINT(tv1, y_fi); /* no need for refcount update */
tv2 = DUK__REGP(a);
z_fi = (ins & DUK_ENC_OP(0x02)) ? x_fi : y_fi;
DUK_TVAL_SET_FASTINT_UPDREF(thr, tv2, z_fi); /* side effects */
break;
}
skip_fastint:
#endif
if (DUK_TVAL_IS_NUMBER(tv1)) {
/* Fast path for the case where the register
* is a number (e.g. loop counter).
*/
x = DUK_TVAL_GET_NUMBER(tv1);
if (ins & DUK_ENC_OP(0x01)) {
y = x - 1.0;
} else {
y = x + 1.0;
}
DUK_TVAL_SET_NUMBER(tv1, y); /* no need for refcount update */
} else {
x = duk_to_number(ctx, bc);
if (ins & DUK_ENC_OP(0x01)) {
y = x - 1.0;
} else {
y = x + 1.0;
}
duk_push_number(ctx, y);
duk_replace(ctx, bc);
}
tv2 = DUK__REGP(a);
z = (ins & DUK_ENC_OP(0x02)) ? x : y;
DUK_TVAL_SET_NUMBER_UPDREF(thr, tv2, z); /* side effects */
break;
}
/* Preinc/predec for var-by-name, slow path. */
case DUK_OP_PREINCV:
case DUK_OP_PREDECV:
case DUK_OP_POSTINCV:
case DUK_OP_POSTDECV: {
duk_context *ctx = (duk_context *) thr;
duk_activation *act;
duk_small_uint_fast_t a = DUK_DEC_A(ins);
duk_uint_fast_t bc = DUK_DEC_BC(ins);
duk_double_t x, y;
duk_tval *tv1;
duk_hstring *name;
/* Two lowest bits of opcode are used to distinguish
* variants. Bit 0 = inc(0)/dec(1), bit 1 = pre(0)/post(1).
*/
DUK_ASSERT((DUK_OP_PREINCV & 0x03) == 0x00);
DUK_ASSERT((DUK_OP_PREDECV & 0x03) == 0x01);
DUK_ASSERT((DUK_OP_POSTINCV & 0x03) == 0x02);
DUK_ASSERT((DUK_OP_POSTDECV & 0x03) == 0x03);
tv1 = DUK__CONSTP(bc);
DUK_ASSERT(DUK_TVAL_IS_STRING(tv1));
name = DUK_TVAL_GET_STRING(tv1);
DUK_ASSERT(name != NULL);
act = thr->callstack + thr->callstack_top - 1;
(void) duk_js_getvar_activation(thr, act, name, 1 /*throw*/); /* -> [... val this] */
/* XXX: fastint fast path would be very useful here */
x = duk_to_number(ctx, -2);
duk_pop_2(ctx);
if (ins & DUK_ENC_OP(0x01)) {
y = x - 1.0;
} else {
y = x + 1.0;
}
duk_push_number(ctx, y);
tv1 = DUK_GET_TVAL_NEGIDX(ctx, -1);
DUK_ASSERT(tv1 != NULL);
duk_js_putvar_activation(thr, act, name, tv1, DUK__STRICT());
duk_pop(ctx);
duk_push_number(ctx, (ins & DUK_ENC_OP(0x02)) ? x : y);
duk_replace(ctx, (duk_idx_t) a);
break;
}
/* Preinc/predec for object properties. */
case DUK_OP_PREINCP:
case DUK_OP_PREDECP:
case DUK_OP_POSTINCP:
case DUK_OP_POSTDECP: {
duk_context *ctx = (duk_context *) thr;
duk_small_uint_fast_t a = DUK_DEC_A(ins);
duk_small_uint_fast_t b = DUK_DEC_B(ins);
duk_small_uint_fast_t c = DUK_DEC_C(ins);
duk_tval *tv_obj;
duk_tval *tv_key;
duk_tval *tv_val;
duk_bool_t rc;
duk_double_t x, y;
/* A -> target reg
* B -> object reg/const (may be const e.g. in "'foo'[1]")
* C -> key reg/const
*/
/* Two lowest bits of opcode are used to distinguish
* variants. Bit 0 = inc(0)/dec(1), bit 1 = pre(0)/post(1).
*/
DUK_ASSERT((DUK_OP_PREINCP & 0x03) == 0x00);
DUK_ASSERT((DUK_OP_PREDECP & 0x03) == 0x01);
DUK_ASSERT((DUK_OP_POSTINCP & 0x03) == 0x02);
DUK_ASSERT((DUK_OP_POSTDECP & 0x03) == 0x03);
tv_obj = DUK__REGCONSTP(b);
tv_key = DUK__REGCONSTP(c);
rc = duk_hobject_getprop(thr, tv_obj, tv_key); /* -> [val] */
DUK_UNREF(rc); /* ignore */
tv_obj = NULL; /* invalidated */
tv_key = NULL; /* invalidated */
x = duk_to_number(ctx, -1);
duk_pop(ctx);
if (ins & DUK_ENC_OP(0x01)) {
y = x - 1.0;
} else {
y = x + 1.0;
}
duk_push_number(ctx, y);
tv_val = DUK_GET_TVAL_NEGIDX(ctx, -1);
DUK_ASSERT(tv_val != NULL);
tv_obj = DUK__REGCONSTP(b);
tv_key = DUK__REGCONSTP(c);
rc = duk_hobject_putprop(thr, tv_obj, tv_key, tv_val, DUK__STRICT());
DUK_UNREF(rc); /* ignore */
tv_obj = NULL; /* invalidated */
tv_key = NULL; /* invalidated */
duk_pop(ctx);
duk_push_number(ctx, (ins & DUK_ENC_OP(0x02)) ? x : y);
duk_replace(ctx, (duk_idx_t) a);
break;
}
case DUK_OP_EXTRA: {
/* XXX: shared decoding of 'b' and 'c'? */
duk_small_uint_fast_t extraop = DUK_DEC_A(ins);
switch ((int) extraop) {
/* XXX: switch cast? */
case DUK_EXTRAOP_NOP: {
/* nop */
break;
}
case DUK_EXTRAOP_INVALID: {
DUK_ERROR_FMT1(thr, DUK_ERR_INTERNAL_ERROR, "INVALID opcode (%ld)", (long) DUK_DEC_BC(ins));
break;
}
case DUK_EXTRAOP_LDTHIS: {
/* Note: 'this' may be bound to any value, not just an object */
duk_uint_fast_t bc = DUK_DEC_BC(ins);
duk_tval *tv1, *tv2;
tv1 = DUK__REGP(bc);
tv2 = thr->valstack_bottom - 1; /* 'this binding' is just under bottom */
DUK_ASSERT(tv2 >= thr->valstack);
DUK_DDD(DUK_DDDPRINT("LDTHIS: %!T to r%ld", (duk_tval *) tv2, (long) bc));
DUK_TVAL_SET_TVAL_UPDREF_FAST(thr, tv1, tv2); /* side effects */
break;
}
case DUK_EXTRAOP_LDUNDEF: {
duk_uint_fast_t bc = DUK_DEC_BC(ins);
duk_tval *tv1;
tv1 = DUK__REGP(bc);
DUK_TVAL_SET_UNDEFINED_UPDREF(thr, tv1); /* side effects */
break;
}
case DUK_EXTRAOP_LDNULL: {
duk_uint_fast_t bc = DUK_DEC_BC(ins);
duk_tval *tv1;
tv1 = DUK__REGP(bc);
DUK_TVAL_SET_NULL_UPDREF(thr, tv1); /* side effects */
break;
}
case DUK_EXTRAOP_LDTRUE:
case DUK_EXTRAOP_LDFALSE: {
duk_uint_fast_t bc = DUK_DEC_BC(ins);
duk_tval *tv1;
duk_small_uint_fast_t bval = (extraop == DUK_EXTRAOP_LDTRUE ? 1 : 0);
tv1 = DUK__REGP(bc);
DUK_TVAL_SET_BOOLEAN_UPDREF(thr, tv1, bval); /* side effects */
break;
}
case DUK_EXTRAOP_NEWOBJ: {
duk_context *ctx = (duk_context *) thr;
duk_small_uint_fast_t b = DUK_DEC_B(ins);
duk_push_object(ctx);
duk_replace(ctx, (duk_idx_t) b);
break;
}
case DUK_EXTRAOP_NEWARR: {
duk_context *ctx = (duk_context *) thr;
duk_small_uint_fast_t b = DUK_DEC_B(ins);
duk_push_array(ctx);
duk_replace(ctx, (duk_idx_t) b);
break;
}
case DUK_EXTRAOP_SETALEN: {
duk_small_uint_fast_t b;
duk_small_uint_fast_t c;
duk_tval *tv1;
duk_hobject *h;
duk_uint32_t len;
b = DUK_DEC_B(ins); tv1 = DUK__REGP(b);
DUK_ASSERT(DUK_TVAL_IS_OBJECT(tv1));
h = DUK_TVAL_GET_OBJECT(tv1);
c = DUK_DEC_C(ins); tv1 = DUK__REGP(c);
DUK_ASSERT(DUK_TVAL_IS_NUMBER(tv1));
len = (duk_uint32_t) DUK_TVAL_GET_NUMBER(tv1);
duk_hobject_set_length(thr, h, len);
break;
}
case DUK_EXTRAOP_TYPEOF: {
duk_context *ctx = (duk_context *) thr;
duk_uint_fast_t bc = DUK_DEC_BC(ins);
duk_push_hstring(ctx, duk_js_typeof(thr, DUK__REGP(bc)));
duk_replace(ctx, (duk_idx_t) bc);
break;
}
case DUK_EXTRAOP_TYPEOFID: {
duk_context *ctx = (duk_context *) thr;
duk_activation *act;
duk_small_uint_fast_t b = DUK_DEC_B(ins);
duk_small_uint_fast_t c = DUK_DEC_C(ins);
duk_hstring *name;
duk_tval *tv;
/* B -> target register
* C -> constant index of identifier name
*/
tv = DUK__REGCONSTP(c); /* XXX: this could be a DUK__CONSTP instead */
DUK_ASSERT(DUK_TVAL_IS_STRING(tv));
name = DUK_TVAL_GET_STRING(tv);
act = thr->callstack + thr->callstack_top - 1;
if (duk_js_getvar_activation(thr, act, name, 0 /*throw*/)) {
/* -> [... val this] */
tv = DUK_GET_TVAL_NEGIDX(ctx, -2);
duk_push_hstring(ctx, duk_js_typeof(thr, tv));
duk_replace(ctx, (duk_idx_t) b);
duk_pop_2(ctx);
} else {
/* unresolvable, no stack changes */
duk_push_hstring_stridx(ctx, DUK_STRIDX_LC_UNDEFINED);
duk_replace(ctx, (duk_idx_t) b);
}
break;
}
case DUK_EXTRAOP_INITENUM: {
duk_context *ctx = (duk_context *) thr;
duk_small_uint_fast_t b = DUK_DEC_B(ins);
duk_small_uint_fast_t c = DUK_DEC_C(ins);
/*
* Enumeration semantics come from for-in statement, E5 Section 12.6.4.
* If called with 'null' or 'undefined', this opcode returns 'null' as
* the enumerator, which is special cased in NEXTENUM. This simplifies
* the compiler part
*/
/* B -> register for writing enumerator object
* C -> value to be enumerated (register)
*/
if (duk_is_null_or_undefined(ctx, (duk_idx_t) c)) {
duk_push_null(ctx);
duk_replace(ctx, (duk_idx_t) b);
} else {
duk_dup(ctx, (duk_idx_t) c);
duk_to_object(ctx, -1);
duk_hobject_enumerator_create(ctx, 0 /*enum_flags*/); /* [ ... val ] --> [ ... enum ] */
duk_replace(ctx, (duk_idx_t) b);
}
break;
}
case DUK_EXTRAOP_NEXTENUM: {
duk_context *ctx = (duk_context *) thr;
duk_small_uint_fast_t b = DUK_DEC_B(ins);
duk_small_uint_fast_t c = DUK_DEC_C(ins);
/*
* NEXTENUM checks whether the enumerator still has unenumerated
* keys. If so, the next key is loaded to the target register
* and the next instruction is skipped. Otherwise the next instruction
* will be executed, jumping out of the enumeration loop.
*/
/* B -> target register for next key
* C -> enum register
*/
DUK_DDD(DUK_DDDPRINT("NEXTENUM: b->%!T, c->%!T",
(duk_tval *) duk_get_tval(ctx, (duk_idx_t) b),
(duk_tval *) duk_get_tval(ctx, (duk_idx_t) c)));
if (duk_is_object(ctx, (duk_idx_t) c)) {
/* XXX: assert 'c' is an enumerator */
duk_dup(ctx, (duk_idx_t) c);
if (duk_hobject_enumerator_next(ctx, 0 /*get_value*/)) {
/* [ ... enum ] -> [ ... next_key ] */
DUK_DDD(DUK_DDDPRINT("enum active, next key is %!T, skip jump slot ",
(duk_tval *) duk_get_tval(ctx, -1)));
curr_pc++;
} else {
/* [ ... enum ] -> [ ... ] */
DUK_DDD(DUK_DDDPRINT("enum finished, execute jump slot"));
duk_push_undefined(ctx);
}
duk_replace(ctx, (duk_idx_t) b);
} else {
/* 'null' enumerator case -> behave as with an empty enumerator */
DUK_ASSERT(duk_is_null(ctx, (duk_idx_t) c));
DUK_DDD(DUK_DDDPRINT("enum is null, execute jump slot"));
}
break;
}
case DUK_EXTRAOP_INITSET:
case DUK_EXTRAOP_INITSETI:
case DUK_EXTRAOP_INITGET:
case DUK_EXTRAOP_INITGETI: {
duk_context *ctx = (duk_context *) thr;
duk_bool_t is_set = (extraop == DUK_EXTRAOP_INITSET || extraop == DUK_EXTRAOP_INITSETI);
duk_small_uint_fast_t b = DUK_DEC_B(ins);
duk_uint_fast_t idx;
/* B -> object register
* C -> C+0 contains key, C+1 closure (value)
*/
/*
* INITSET/INITGET are only used to initialize object literal keys.
* The compiler ensures that there cannot be a previous data property
* of the same name. It also ensures that setter and getter can only
* be initialized once (or not at all).
*/
idx = (duk_uint_fast_t) DUK_DEC_C(ins);
if (extraop == DUK_EXTRAOP_INITSETI || extraop == DUK_EXTRAOP_INITGETI) {
duk_tval *tv_ind = DUK__REGP(idx);
DUK_ASSERT(DUK_TVAL_IS_NUMBER(tv_ind));
idx = (duk_uint_fast_t) DUK_TVAL_GET_NUMBER(tv_ind);
}
#if defined(DUK_USE_EXEC_INDIRECT_BOUND_CHECK)
if (idx + 2 > (duk_uint_fast_t) duk_get_top(ctx)) {
/* XXX: use duk_is_valid_index() instead? */
/* XXX: improve check; check against nregs, not against top */
DUK__INTERNAL_ERROR("INITSET/INITGET out of bounds");
}
#endif
/* XXX: this is now a very unoptimal implementation -- this can be
* made very simple by direct manipulation of the object internals,
* given the guarantees above.
*/
duk_push_hobject_bidx(ctx, DUK_BIDX_OBJECT_CONSTRUCTOR);
duk_get_prop_stridx(ctx, -1, DUK_STRIDX_DEFINE_PROPERTY);
duk_push_undefined(ctx);
duk_dup(ctx, (duk_idx_t) b);
duk_dup(ctx, (duk_idx_t) (idx + 0));
duk_push_object(ctx); /* -> [ Object defineProperty undefined obj key desc ] */
duk_push_true(ctx);
duk_put_prop_stridx(ctx, -2, DUK_STRIDX_ENUMERABLE);
duk_push_true(ctx);
duk_put_prop_stridx(ctx, -2, DUK_STRIDX_CONFIGURABLE);
duk_dup(ctx, (duk_idx_t) (idx + 1));
duk_put_prop_stridx(ctx, -2, (is_set ? DUK_STRIDX_SET : DUK_STRIDX_GET));
DUK_DDD(DUK_DDDPRINT("INITGET/INITSET: obj=%!T, key=%!T, desc=%!T",
(duk_tval *) duk_get_tval(ctx, -3),
(duk_tval *) duk_get_tval(ctx, -2),
(duk_tval *) duk_get_tval(ctx, -1)));
duk_call_method(ctx, 3); /* -> [ Object res ] */
duk_pop_2(ctx);
DUK_DDD(DUK_DDDPRINT("INITGET/INITSET AFTER: obj=%!T",
(duk_tval *) duk_get_tval(ctx, (duk_idx_t) b)));
break;
}
case DUK_EXTRAOP_ENDTRY: {
duk_catcher *cat;
duk_tval *tv1;
DUK_ASSERT(thr->catchstack_top >= 1);
DUK_ASSERT(thr->callstack_top >= 1);
DUK_ASSERT(thr->catchstack[thr->catchstack_top - 1].callstack_index == thr->callstack_top - 1);
cat = thr->catchstack + thr->catchstack_top - 1;
DUK_DDD(DUK_DDDPRINT("ENDTRY: clearing catch active flag (regardless of whether it was set or not)"));
DUK_CAT_CLEAR_CATCH_ENABLED(cat);
if (DUK_CAT_HAS_FINALLY_ENABLED(cat)) {
DUK_DDD(DUK_DDDPRINT("ENDTRY: finally part is active, jump through 2nd jump slot with 'normal continuation'"));
tv1 = thr->valstack + cat->idx_base;
DUK_ASSERT(tv1 >= thr->valstack && tv1 < thr->valstack_top);
DUK_TVAL_SET_UNDEFINED_UPDREF(thr, tv1); /* side effects */
tv1 = NULL;
tv1 = thr->valstack + cat->idx_base + 1;
DUK_ASSERT(tv1 >= thr->valstack && tv1 < thr->valstack_top);
DUK_TVAL_SET_FASTINT_U32_UPDREF(thr, tv1, (duk_uint32_t) DUK_LJ_TYPE_NORMAL); /* side effects */
tv1 = NULL;
DUK_CAT_CLEAR_FINALLY_ENABLED(cat);
} else {
DUK_DDD(DUK_DDDPRINT("ENDTRY: no finally part, dismantle catcher, jump through 2nd jump slot (to end of statement)"));
duk_hthread_catchstack_unwind(thr, thr->catchstack_top - 1);
/* no need to unwind callstack */
}
curr_pc = cat->pc_base + 1;
break;
}
case DUK_EXTRAOP_ENDCATCH: {
duk_activation *act;
duk_catcher *cat;
duk_tval *tv1;
DUK_ASSERT(thr->catchstack_top >= 1);
DUK_ASSERT(thr->callstack_top >= 1);
DUK_ASSERT(thr->catchstack[thr->catchstack_top - 1].callstack_index == thr->callstack_top - 1);
cat = thr->catchstack + thr->catchstack_top - 1;
DUK_ASSERT(!DUK_CAT_HAS_CATCH_ENABLED(cat)); /* cleared before entering catch part */
act = thr->callstack + thr->callstack_top - 1;
if (DUK_CAT_HAS_LEXENV_ACTIVE(cat)) {
duk_hobject *prev_env;
/* 'with' binding has no catch clause, so can't be here unless a normal try-catch */
DUK_ASSERT(DUK_CAT_HAS_CATCH_BINDING_ENABLED(cat));
DUK_ASSERT(act->lex_env != NULL);
DUK_DDD(DUK_DDDPRINT("ENDCATCH: popping catcher part lexical environment"));
prev_env = act->lex_env;
DUK_ASSERT(prev_env != NULL);
act->lex_env = DUK_HOBJECT_GET_PROTOTYPE(thr->heap, prev_env);
DUK_CAT_CLEAR_LEXENV_ACTIVE(cat);
DUK_HOBJECT_DECREF(thr, prev_env); /* side effects */
}
if (DUK_CAT_HAS_FINALLY_ENABLED(cat)) {
DUK_DDD(DUK_DDDPRINT("ENDCATCH: finally part is active, jump through 2nd jump slot with 'normal continuation'"));
tv1 = thr->valstack + cat->idx_base;
DUK_ASSERT(tv1 >= thr->valstack && tv1 < thr->valstack_top);
DUK_TVAL_SET_UNDEFINED_UPDREF(thr, tv1); /* side effects */
tv1 = NULL;
tv1 = thr->valstack + cat->idx_base + 1;
DUK_ASSERT(tv1 >= thr->valstack && tv1 < thr->valstack_top);
DUK_TVAL_SET_FASTINT_U32_UPDREF(thr, tv1, (duk_uint32_t) DUK_LJ_TYPE_NORMAL); /* side effects */
tv1 = NULL;
DUK_CAT_CLEAR_FINALLY_ENABLED(cat);
} else {
DUK_DDD(DUK_DDDPRINT("ENDCATCH: no finally part, dismantle catcher, jump through 2nd jump slot (to end of statement)"));
duk_hthread_catchstack_unwind(thr, thr->catchstack_top - 1);
/* no need to unwind callstack */
}
curr_pc = cat->pc_base + 1;
break;
}
case DUK_EXTRAOP_ENDFIN: {
duk_context *ctx = (duk_context *) thr;
duk_catcher *cat;
duk_tval *tv1;
duk_small_uint_t cont_type;
duk_small_uint_t ret_result;
/* Sync and NULL early. */
DUK__SYNC_AND_NULL_CURR_PC();
DUK_ASSERT(thr->catchstack_top >= 1);
DUK_ASSERT(thr->callstack_top >= 1);
DUK_ASSERT(thr->catchstack[thr->catchstack_top - 1].callstack_index == thr->callstack_top - 1);
cat = thr->catchstack + thr->catchstack_top - 1;
/* CATCH flag may be enabled or disabled here; it may be enabled if
* the statement has a catch block but the try block does not throw
* an error.
*/
DUK_ASSERT(!DUK_CAT_HAS_FINALLY_ENABLED(cat)); /* cleared before entering finally */
/* XXX: assert idx_base */
DUK_DDD(DUK_DDDPRINT("ENDFIN: completion value=%!T, type=%!T",
(duk_tval *) (thr->valstack + cat->idx_base + 0),
(duk_tval *) (thr->valstack + cat->idx_base + 1)));
tv1 = thr->valstack + cat->idx_base + 1; /* type */
DUK_ASSERT(DUK_TVAL_IS_NUMBER(tv1));
cont_type = (duk_small_uint_t) DUK_TVAL_GET_NUMBER(tv1);
switch (cont_type) {
case DUK_LJ_TYPE_NORMAL: {
DUK_DDD(DUK_DDDPRINT("ENDFIN: finally part finishing with 'normal' (non-abrupt) completion -> "
"dismantle catcher, resume execution after ENDFIN"));
duk_hthread_catchstack_unwind(thr, thr->catchstack_top - 1);
/* no need to unwind callstack */
goto restart_execution;
}
case DUK_LJ_TYPE_RETURN: {
DUK_DDD(DUK_DDDPRINT("ENDFIN: finally part finishing with 'return' complation -> dismantle "
"catcher, handle return, lj.value1=%!T", thr->valstack + cat->idx_base));
/* Not necessary to unwind catchstack: return handling will
* do it. The finally flag of 'cat' is no longer set. The
* catch flag may be set, but it's not checked by return handling.
*/
DUK_ASSERT(!DUK_CAT_HAS_FINALLY_ENABLED(cat)); /* cleared before entering finally */
#if 0
duk_hthread_catchstack_unwind(thr, thr->catchstack_top - 1);
#endif
duk_push_tval(ctx, thr->valstack + cat->idx_base);
ret_result = duk__handle_return(thr,
entry_thread,
entry_callstack_top);
if (ret_result == DUK__RETHAND_RESTART) {
goto restart_execution;
}
DUK_ASSERT(ret_result == DUK__RETHAND_FINISHED);
DUK_DDD(DUK_DDDPRINT("exiting executor after ENDFIN and RETURN (pseudo) longjmp type"));
return;
}
case DUK_LJ_TYPE_BREAK:
case DUK_LJ_TYPE_CONTINUE: {
duk_uint_t label_id;
duk_small_uint_t lj_type;
/* Not necessary to unwind catchstack: break/continue
* handling will do it. The finally flag of 'cat' is
* no longer set. The catch flag may be set, but it's
* not checked by break/continue handling.
*/
#if 0
duk_hthread_catchstack_unwind(thr, thr->catchstack_top - 1);
#endif
tv1 = thr->valstack + cat->idx_base;
DUK_ASSERT(DUK_TVAL_IS_NUMBER(tv1));
#if defined(DUK_USE_FASTINT)
DUK_ASSERT(DUK_TVAL_IS_FASTINT(tv1));
label_id = (duk_small_uint_t) DUK_TVAL_GET_FASTINT_U32(tv1);
#else
label_id = (duk_small_uint_t) DUK_TVAL_GET_NUMBER(tv1);
#endif
lj_type = cont_type;
duk__handle_break_or_continue(thr, label_id, lj_type);
goto restart_execution;
}
default: {
DUK_DDD(DUK_DDDPRINT("ENDFIN: finally part finishing with abrupt completion, lj_type=%ld -> "
"dismantle catcher, re-throw error",
(long) cont_type));
duk_push_tval(ctx, thr->valstack + cat->idx_base);
duk_err_setup_heap_ljstate(thr, (duk_small_int_t) cont_type);
DUK_ASSERT(thr->heap->lj.jmpbuf_ptr != NULL); /* always in executor */
duk_err_longjmp(thr);
DUK_UNREACHABLE();
}
}
/* Must restart in all cases because we NULLed thr->ptr_curr_pc. */
DUK_UNREACHABLE();
break;
}
case DUK_EXTRAOP_THROW: {
duk_context *ctx = (duk_context *) thr;
duk_uint_fast_t bc = DUK_DEC_BC(ins);
/* Note: errors are augmented when they are created, not
* when they are thrown. So, don't augment here, it would
* break re-throwing for instance.
*/
/* Sync so that augmentation sees up-to-date activations, NULL
* thr->ptr_curr_pc so that it's not used if side effects occur
* in augmentation or longjmp handling.
*/
DUK__SYNC_AND_NULL_CURR_PC();
duk_dup(ctx, (duk_idx_t) bc);
DUK_DDD(DUK_DDDPRINT("THROW ERROR (BYTECODE): %!dT (before throw augment)",
(duk_tval *) duk_get_tval(ctx, -1)));
#if defined(DUK_USE_AUGMENT_ERROR_THROW)
duk_err_augment_error_throw(thr);
DUK_DDD(DUK_DDDPRINT("THROW ERROR (BYTECODE): %!dT (after throw augment)",
(duk_tval *) duk_get_tval(ctx, -1)));
#endif
duk_err_setup_heap_ljstate(thr, DUK_LJ_TYPE_THROW);
DUK_ASSERT(thr->heap->lj.jmpbuf_ptr != NULL); /* always in executor */
duk_err_longjmp(thr);
DUK_UNREACHABLE();
break;
}
case DUK_EXTRAOP_INVLHS: {
DUK_ERROR(thr, DUK_ERR_REFERENCE_ERROR, "invalid lvalue");
DUK_UNREACHABLE();
break;
}
case DUK_EXTRAOP_UNM:
case DUK_EXTRAOP_UNP: {
duk_uint_fast_t bc = DUK_DEC_BC(ins);
duk__vm_arith_unary_op(thr, DUK__REGP(bc), bc, extraop);
break;
}
case DUK_EXTRAOP_DEBUGGER: {
/* Opcode only emitted by compiler when debugger
* support is enabled. Ignore it silently without
* debugger support, in case it has been loaded
* from precompiled bytecode.
*/
#if defined(DUK_USE_DEBUGGER_SUPPORT)
if (DUK_HEAP_IS_DEBUGGER_ATTACHED(thr->heap)) {
DUK_D(DUK_DPRINT("DEBUGGER statement encountered, halt execution"));
DUK__SYNC_AND_NULL_CURR_PC();
duk_debug_halt_execution(thr, 1 /*use_prev_pc*/);
DUK_D(DUK_DPRINT("DEBUGGER statement finished, resume execution"));
goto restart_execution;
} else {
DUK_D(DUK_DPRINT("DEBUGGER statement ignored, debugger not attached"));
}
#else
DUK_D(DUK_DPRINT("DEBUGGER statement ignored, no debugger support"));
#endif
break;
}
case DUK_EXTRAOP_BREAK: {
duk_uint_fast_t bc = DUK_DEC_BC(ins);
DUK_DDD(DUK_DDDPRINT("BREAK: %ld", (long) bc));
DUK__SYNC_AND_NULL_CURR_PC();
duk__handle_break_or_continue(thr, (duk_uint_t) bc, DUK_LJ_TYPE_BREAK);
goto restart_execution;
}
case DUK_EXTRAOP_CONTINUE: {
duk_uint_fast_t bc = DUK_DEC_BC(ins);
DUK_DDD(DUK_DDDPRINT("CONTINUE: %ld", (long) bc));
DUK__SYNC_AND_NULL_CURR_PC();
duk__handle_break_or_continue(thr, (duk_uint_t) bc, DUK_LJ_TYPE_CONTINUE);
goto restart_execution;
}
case DUK_EXTRAOP_BNOT: {
duk_uint_fast_t bc = DUK_DEC_BC(ins);
duk__vm_bitwise_not(thr, DUK__REGP(bc), bc);
break;
}
case DUK_EXTRAOP_LNOT: {
duk_uint_fast_t bc = DUK_DEC_BC(ins);
duk_tval *tv1;
tv1 = DUK__REGP(bc);
duk__vm_logical_not(thr, tv1, tv1);
break;
}
case DUK_EXTRAOP_INSTOF: {
duk_context *ctx = (duk_context *) thr;
duk_small_uint_fast_t b = DUK_DEC_B(ins);
duk_small_uint_fast_t c = DUK_DEC_C(ins);
duk_bool_t tmp;
tmp = duk_js_instanceof(thr, DUK__REGP(b), DUK__REGCONSTP(c));
duk_push_boolean(ctx, tmp);
duk_replace(ctx, (duk_idx_t) b);
break;
}
case DUK_EXTRAOP_IN: {
duk_context *ctx = (duk_context *) thr;
duk_small_uint_fast_t b = DUK_DEC_B(ins);
duk_small_uint_fast_t c = DUK_DEC_C(ins);
duk_bool_t tmp;
tmp = duk_js_in(thr, DUK__REGP(b), DUK__REGCONSTP(c));
duk_push_boolean(ctx, tmp);
duk_replace(ctx, (duk_idx_t) b);
break;
}
case DUK_EXTRAOP_LABEL: {
duk_catcher *cat;
duk_uint_fast_t bc = DUK_DEC_BC(ins);
/* allocate catcher and populate it (should be atomic) */
duk_hthread_catchstack_grow(thr);
cat = thr->catchstack + thr->catchstack_top;
thr->catchstack_top++;
cat->flags = DUK_CAT_TYPE_LABEL | (bc << DUK_CAT_LABEL_SHIFT);
cat->callstack_index = thr->callstack_top - 1;
cat->pc_base = (duk_instr_t *) curr_pc; /* pre-incremented, points to first jump slot */
cat->idx_base = 0; /* unused for label */
cat->h_varname = NULL;
DUK_DDD(DUK_DDDPRINT("LABEL catcher: flags=0x%08lx, callstack_index=%ld, pc_base=%ld, "
"idx_base=%ld, h_varname=%!O, label_id=%ld",
(long) cat->flags, (long) cat->callstack_index, (long) cat->pc_base,
(long) cat->idx_base, (duk_heaphdr *) cat->h_varname, (long) DUK_CAT_GET_LABEL(cat)));
curr_pc += 2; /* skip jump slots */
break;
}
case DUK_EXTRAOP_ENDLABEL: {
duk_catcher *cat;
#if defined(DUK_USE_DDDPRINT) || defined(DUK_USE_ASSERTIONS)
duk_uint_fast_t bc = DUK_DEC_BC(ins);
#endif
#if defined(DUK_USE_DDDPRINT)
DUK_DDD(DUK_DDDPRINT("ENDLABEL %ld", (long) bc));
#endif
DUK_ASSERT(thr->catchstack_top >= 1);
cat = thr->catchstack + thr->catchstack_top - 1;
DUK_UNREF(cat);
DUK_ASSERT(DUK_CAT_GET_TYPE(cat) == DUK_CAT_TYPE_LABEL);
DUK_ASSERT((duk_uint_fast_t) DUK_CAT_GET_LABEL(cat) == bc);
duk_hthread_catchstack_unwind(thr, thr->catchstack_top - 1);
/* no need to unwind callstack */
break;
}
default: {
DUK__INTERNAL_ERROR("invalid extra opcode");
}
} /* end switch */
break;
}
default: {
/* this should never be possible, because the switch-case is
* comprehensive
*/
DUK__INTERNAL_ERROR("invalid opcode");
break;
}
} /* end switch */
}
DUK_UNREACHABLE();
#ifndef DUK_USE_VERBOSE_EXECUTOR_ERRORS
internal_error:
DUK_ERROR_INTERNAL(thr, "internal error in bytecode executor");
#endif
}
#undef DUK__LONGJMP_RESTART
#undef DUK__LONGJMP_FINISHED
#undef DUK__LONGJMP_RETHROW
#undef DUK__RETHAND_RESTART
#undef DUK__RETHAND_FINISHED
#undef DUK__FUN
#undef DUK__STRICT
#undef DUK__REG
#undef DUK__REGP
#undef DUK__CONST
#undef DUK__CONSTP
#undef DUK__RCISREG
#undef DUK__REGCONST
#undef DUK__REGCONSTP
#undef DUK__INTERNAL_ERROR
#undef DUK__SYNC_CURR_PC
#undef DUK__SYNC_AND_NULL_CURR_PC