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Much faster destructuring at the expense of a slight incompatibility

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with the spec when direct evals are present (v8 behaves the same way).
This commit is contained in:
Fabrice Bellard
2025-11-03 17:08:59 +01:00
parent a6816be23a
commit e015918dd8
3 changed files with 103 additions and 41 deletions
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126
quickjs.c
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@@ -25143,18 +25143,19 @@ done:
return js_parse_expect(s, ']');
}
/* XXX: remove */
/* check if scope chain contains a with statement */
static BOOL has_with_scope(JSFunctionDef *s, int scope_level)
{
/* check if scope chain contains a with statement */
while (s) {
int scope_idx = s->scopes[scope_level].first;
while (scope_idx >= 0) {
JSVarDef *vd = &s->vars[scope_idx];
if (vd->var_name == JS_ATOM__with_)
return TRUE;
scope_idx = vd->scope_next;
/* no with in strict mode */
if (!(s->js_mode & JS_MODE_STRICT)) {
int scope_idx = s->scopes[scope_level].first;
while (scope_idx >= 0) {
JSVarDef *vd = &s->vars[scope_idx];
if (vd->var_name == JS_ATOM__with_)
return TRUE;
scope_idx = vd->scope_next;
}
}
/* check parent scopes */
scope_level = s->parent_scope_level;
@@ -25187,7 +25188,11 @@ static __exception int get_lvalue(JSParseState *s, int *popcode, int *pscope,
}
if (name == JS_ATOM_this || name == JS_ATOM_new_target)
goto invalid_lvalue;
depth = 2; /* will generate OP_get_ref_value */
if (has_with_scope(fd, scope)) {
depth = 2; /* will generate OP_get_ref_value */
} else {
depth = 0;
}
break;
case OP_get_field:
name = get_u32(fd->byte_code.buf + fd->last_opcode_pos + 1);
@@ -25224,16 +25229,22 @@ static __exception int get_lvalue(JSParseState *s, int *popcode, int *pscope,
/* get the value but keep the object/fields on the stack */
switch(opcode) {
case OP_scope_get_var:
label = new_label(s);
if (label < 0)
return -1;
emit_op(s, OP_scope_make_ref);
emit_atom(s, name);
emit_u32(s, label);
emit_u16(s, scope);
update_label(fd, label, 1);
emit_op(s, OP_get_ref_value);
opcode = OP_get_ref_value;
if (depth != 0) {
label = new_label(s);
if (label < 0)
return -1;
emit_op(s, OP_scope_make_ref);
emit_atom(s, name);
emit_u32(s, label);
emit_u16(s, scope);
update_label(fd, label, 1);
emit_op(s, OP_get_ref_value);
opcode = OP_get_ref_value;
} else {
emit_op(s, OP_scope_get_var);
emit_atom(s, name);
emit_u16(s, scope);
}
break;
case OP_get_field:
emit_op(s, OP_get_field2);
@@ -25258,15 +25269,17 @@ static __exception int get_lvalue(JSParseState *s, int *popcode, int *pscope,
} else {
switch(opcode) {
case OP_scope_get_var:
label = new_label(s);
if (label < 0)
return -1;
emit_op(s, OP_scope_make_ref);
emit_atom(s, name);
emit_u32(s, label);
emit_u16(s, scope);
update_label(fd, label, 1);
opcode = OP_get_ref_value;
if (depth != 0) {
label = new_label(s);
if (label < 0)
return -1;
emit_op(s, OP_scope_make_ref);
emit_atom(s, name);
emit_u32(s, label);
emit_u16(s, scope);
update_label(fd, label, 1);
opcode = OP_get_ref_value;
}
break;
default:
break;
@@ -25300,6 +25313,21 @@ static void put_lvalue(JSParseState *s, int opcode, int scope,
BOOL is_let)
{
switch(opcode) {
case OP_scope_get_var:
/* depth = 0 */
switch(special) {
case PUT_LVALUE_NOKEEP:
case PUT_LVALUE_NOKEEP_DEPTH:
case PUT_LVALUE_KEEP_SECOND:
case PUT_LVALUE_NOKEEP_BOTTOM:
break;
case PUT_LVALUE_KEEP_TOP:
emit_op(s, OP_dup);
break;
default:
abort();
}
break;
case OP_get_field:
case OP_scope_get_private_field:
/* depth = 1 */
@@ -25371,8 +25399,6 @@ static void put_lvalue(JSParseState *s, int opcode, int scope,
switch(opcode) {
case OP_scope_get_var: /* val -- */
assert(special == PUT_LVALUE_NOKEEP ||
special == PUT_LVALUE_NOKEEP_DEPTH);
emit_op(s, is_let ? OP_scope_put_var_init : OP_scope_put_var);
emit_u32(s, name); /* has refcount */
emit_u16(s, scope);
@@ -25726,6 +25752,8 @@ static int js_parse_destructuring_element(JSParseState *s, int tok, int is_arg,
/* swap ref and lvalue object if any */
if (prop_name == JS_ATOM_NULL) {
switch(depth_lvalue) {
case 0:
break;
case 1:
/* source prop x -> x source prop */
emit_op(s, OP_rot3r);
@@ -25739,9 +25767,13 @@ static int js_parse_destructuring_element(JSParseState *s, int tok, int is_arg,
emit_op(s, OP_rot5l);
emit_op(s, OP_rot5l);
break;
default:
abort();
}
} else {
switch(depth_lvalue) {
case 0:
break;
case 1:
/* source x -> x source */
emit_op(s, OP_swap);
@@ -25754,6 +25786,8 @@ static int js_parse_destructuring_element(JSParseState *s, int tok, int is_arg,
/* source x y z -> x y z source */
emit_op(s, OP_rot4l);
break;
default:
abort();
}
}
}
@@ -27405,7 +27439,7 @@ static __exception int js_parse_assign_expr2(JSParseState *s, int parse_flags)
}
if (op == '=') {
if (opcode == OP_get_ref_value && name == name0) {
if ((opcode == OP_get_ref_value || opcode == OP_scope_get_var) && name == name0) {
set_object_name(s, name);
}
} else {
@@ -27440,11 +27474,14 @@ static __exception int js_parse_assign_expr2(JSParseState *s, int parse_flags)
return -1;
}
if (opcode == OP_get_ref_value && name == name0) {
if ((opcode == OP_get_ref_value || opcode == OP_scope_get_var) && name == name0) {
set_object_name(s, name);
}
switch(depth_lvalue) {
case 0:
emit_op(s, OP_dup);
break;
case 1:
emit_op(s, OP_insert2);
break;
@@ -32202,14 +32239,22 @@ static int resolve_scope_var(JSContext *ctx, JSFunctionDef *s,
}
}
break;
case OP_scope_put_var:
if (!(var_idx & ARGUMENT_VAR_OFFSET) &&
s->vars[var_idx].var_kind == JS_VAR_FUNCTION_NAME) {
/* in non strict mode, modifying the function name is ignored */
dbuf_putc(bc, OP_drop);
goto done;
}
goto local_scope_var;
case OP_scope_get_ref:
dbuf_putc(bc, OP_undefined);
/* fall thru */
goto local_scope_var;
case OP_scope_get_var_checkthis:
case OP_scope_get_var_undef:
case OP_scope_get_var:
case OP_scope_put_var:
case OP_scope_put_var_init:
local_scope_var:
is_put = (op == OP_scope_put_var || op == OP_scope_put_var_init);
if (var_idx & ARGUMENT_VAR_OFFSET) {
dbuf_putc(bc, OP_get_arg + is_put);
@@ -32497,15 +32542,22 @@ static int resolve_scope_var(JSContext *ctx, JSFunctionDef *s,
dbuf_put_u16(bc, idx);
}
break;
case OP_scope_put_var:
if (s->closure_var[idx].var_kind == JS_VAR_FUNCTION_NAME) {
/* in non strict mode, modifying the function name is ignored */
dbuf_putc(bc, OP_drop);
goto done;
}
goto closure_scope_var;
case OP_scope_get_ref:
/* XXX: should create a dummy object with a named slot that is
a reference to the closure variable */
dbuf_putc(bc, OP_undefined);
/* fall thru */
goto closure_scope_var;
case OP_scope_get_var_undef:
case OP_scope_get_var:
case OP_scope_put_var:
case OP_scope_put_var_init:
closure_scope_var:
is_put = (op == OP_scope_put_var ||
op == OP_scope_put_var_init);
if (is_put) {