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Bug 739532 - don't malloc BytecodeEmitter (r=jorendorff)

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--HG--
extra : rebase_source : e831aeba4813e6a7eea7c0dedf9b3946525518ce
This commit is contained in:
Luke Wagner 2012-03-23 11:29:30 -07:00
parent 6b6c3c6cef
commit f23d473933
1 changed files with 12 additions and 18 deletions
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30
js/src/frontend/BytecodeEmitter.cpp
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@ -4893,7 +4893,7 @@ EmitFor(JSContext *cx, BytecodeEmitter *bce, ParseNode *pn, ptrdiff_t top)
: EmitNormalFor(cx, bce, pn, top);
}
static bool
static JS_NEVER_INLINE bool
EmitFunc(JSContext *cx, BytecodeEmitter *bce, ParseNode *pn)
{
#if JS_HAS_XML_SUPPORT
@ -4918,35 +4918,29 @@ EmitFunc(JSContext *cx, BytecodeEmitter *bce, ParseNode *pn)
fun->kind() == JSFUN_INTERPRETED);
{
/*
* Generate code for the function's body. bce2 is not allocated on the
* stack because doing so significantly reduces the maximum depth of
* nested functions we can handle. See bug 696284.
*/
AutoPtr<BytecodeEmitter> bce2(cx);
bce2 = cx->new_<BytecodeEmitter>(bce->parser, pn->pn_pos.begin.lineno);
if (!bce2 || !bce2->init(cx))
BytecodeEmitter bce2(bce->parser, pn->pn_pos.begin.lineno);
if (!bce2.init(cx))
return false;
bce2->flags = pn->pn_funbox->tcflags | TCF_COMPILING | TCF_IN_FUNCTION |
bce2.flags = pn->pn_funbox->tcflags | TCF_COMPILING | TCF_IN_FUNCTION |
(bce->flags & TCF_FUN_MIGHT_ALIAS_LOCALS);
bce2->bindings.transfer(cx, &pn->pn_funbox->bindings);
bce2->setFunction(fun);
bce2->funbox = pn->pn_funbox;
bce2->parent = bce;
bce2->globalScope = bce->globalScope;
bce2.bindings.transfer(cx, &pn->pn_funbox->bindings);
bce2.setFunction(fun);
bce2.funbox = pn->pn_funbox;
bce2.parent = bce;
bce2.globalScope = bce->globalScope;
/*
* js::frontend::SetStaticLevel limited static nesting depth to fit in
* 16 bits and to reserve the all-ones value, thereby reserving the
* magic FREE_UPVAR_COOKIE value. Note the bce2->staticLevel assignment
* magic FREE_UPVAR_COOKIE value. Note the bce2.staticLevel assignment
* below.
*/
JS_ASSERT(bce->staticLevel < JS_BITMASK(16) - 1);
bce2->staticLevel = bce->staticLevel + 1;
bce2.staticLevel = bce->staticLevel + 1;
/* We measured the max scope depth when we parsed the function. */
if (!EmitFunctionScript(cx, bce2.get(), pn->pn_body))
if (!EmitFunctionScript(cx, &bce2, pn->pn_body))
return false;
}