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jsinterpinlines.h
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jsinterpinlines.h
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/* -*- Mode: C; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 4 -*-
* vim: set ts=4 sw=4 et tw=99:
*
* ***** BEGIN LICENSE BLOCK *****
* Version: MPL 1.1/GPL 2.0/LGPL 2.1
*
* The contents of this file are subject to the Mozilla Public License Version
* 1.1 (the "License"); you may not use this file except in compliance with
* the License. You may obtain a copy of the License at
* http://www.mozilla.org/MPL/
*
* Software distributed under the License is distributed on an "AS IS" basis,
* WITHOUT WARRANTY OF ANY KIND, either express or implied. See the License
* for the specific language governing rights and limitations under the
* License.
*
* The Original Code is SpiderMonkey code.
*
* The Initial Developer of the Original Code is
* Mozilla Corporation.
* Portions created by the Initial Developer are Copyright (C) 2010
* the Initial Developer. All Rights Reserved.
*
* Contributor(s):
* Luke Wagner <lw@mozilla.com>
*
* Alternatively, the contents of this file may be used under the terms of
* either of the GNU General Public License Version 2 or later (the "GPL"),
* or the GNU Lesser General Public License Version 2.1 or later (the "LGPL"),
* in which case the provisions of the GPL or the LGPL are applicable instead
* of those above. If you wish to allow use of your version of this file only
* under the terms of either the GPL or the LGPL, and not to allow others to
* use your version of this file under the terms of the MPL, indicate your
* decision by deleting the provisions above and replace them with the notice
* and other provisions required by the GPL or the LGPL. If you do not delete
* the provisions above, a recipient may use your version of this file under
* the terms of any one of the MPL, the GPL or the LGPL.
*
* ***** END LICENSE BLOCK ***** */
#ifndef jsinterpinlines_h__
#define jsinterpinlines_h__
#include "jsapi.h"
#include "jsbool.h"
#include "jscompartment.h"
#include "jsinterp.h"
#include "jsnum.h"
#include "jsprobes.h"
#include "jsstr.h"
#include "methodjit/MethodJIT.h"
#include "jsfuninlines.h"
#include "vm/Stack-inl.h"
namespace js {
class AutoPreserveEnumerators {
JSContext *cx;
JSObject *enumerators;
public:
AutoPreserveEnumerators(JSContext *cx) : cx(cx), enumerators(cx->enumerators)
{
}
~AutoPreserveEnumerators()
{
cx->enumerators = enumerators;
}
};
class InvokeSessionGuard
{
InvokeArgsGuard args_;
InvokeFrameGuard frame_;
Value savedCallee_, savedThis_;
Value *formals_, *actuals_;
unsigned nformals_;
JSScript *script_;
Value *stackLimit_;
jsbytecode *stop_;
bool optimized() const { return frame_.pushed(); }
public:
InvokeSessionGuard() : args_(), frame_() {}
~InvokeSessionGuard() {}
bool start(JSContext *cx, const Value &callee, const Value &thisv, uintN argc);
bool invoke(JSContext *cx) const;
bool started() const {
return args_.pushed();
}
Value &operator[](unsigned i) const {
JS_ASSERT(i < argc());
Value &arg = i < nformals_ ? formals_[i] : actuals_[i];
JS_ASSERT_IF(optimized(), &arg == &frame_.fp()->canonicalActualArg(i));
JS_ASSERT_IF(!optimized(), &arg == &args_[i]);
return arg;
}
uintN argc() const {
return args_.argc();
}
const Value &rval() const {
return optimized() ? frame_.fp()->returnValue() : args_.rval();
}
};
inline bool
InvokeSessionGuard::invoke(JSContext *cx) const
{
/* N.B. Must be kept in sync with Invoke */
/* Refer to canonical (callee, this) for optimized() sessions. */
formals_[-2] = savedCallee_;
formals_[-1] = savedThis_;
/* Prevent spurious accessing-callee-after-rval assert. */
args_.calleeHasBeenReset();
#ifdef JS_METHODJIT
void *code;
if (!optimized() || !(code = script_->getJIT(false /* !constructing */)->invokeEntry))
#else
if (!optimized())
#endif
return Invoke(cx, args_);
/* Clear any garbage left from the last Invoke. */
StackFrame *fp = frame_.fp();
fp->clearMissingArgs();
fp->resetInvokeCallFrame();
SetValueRangeToUndefined(fp->slots(), script_->nfixed);
JSBool ok;
{
AutoPreserveEnumerators preserve(cx);
Probes::enterJSFun(cx, fp->fun(), script_);
#ifdef JS_METHODJIT
ok = mjit::EnterMethodJIT(cx, fp, code, stackLimit_);
cx->regs().pc = stop_;
#else
cx->regs().pc = script_->code;
ok = Interpret(cx, cx->fp());
#endif
Probes::exitJSFun(cx, fp->fun(), script_);
}
/* Don't clobber callee with rval; rval gets read from fp->rval. */
return ok;
}
namespace detail {
template<typename T> class PrimitiveBehavior { };
template<>
class PrimitiveBehavior<JSString *> {
public:
static inline bool isType(const Value &v) { return v.isString(); }
static inline JSString *extract(const Value &v) { return v.toString(); }
static inline Class *getClass() { return &js_StringClass; }
};
template<>
class PrimitiveBehavior<bool> {
public:
static inline bool isType(const Value &v) { return v.isBoolean(); }
static inline bool extract(const Value &v) { return v.toBoolean(); }
static inline Class *getClass() { return &js_BooleanClass; }
};
template<>
class PrimitiveBehavior<double> {
public:
static inline bool isType(const Value &v) { return v.isNumber(); }
static inline double extract(const Value &v) { return v.toNumber(); }
static inline Class *getClass() { return &js_NumberClass; }
};
} // namespace detail
template <typename T>
inline bool
GetPrimitiveThis(JSContext *cx, Value *vp, T *v)
{
typedef detail::PrimitiveBehavior<T> Behavior;
const Value &thisv = vp[1];
if (Behavior::isType(thisv)) {
*v = Behavior::extract(thisv);
return true;
}
if (thisv.isObject() && thisv.toObject().getClass() == Behavior::getClass()) {
*v = Behavior::extract(thisv.toObject().getPrimitiveThis());
return true;
}
ReportIncompatibleMethod(cx, vp, Behavior::getClass());
return false;
}
/*
* Compute the implicit |this| parameter for a call expression where the callee
* is an unqualified name reference.
*
* We can avoid computing |this| eagerly and push the implicit callee-coerced
* |this| value, undefined, according to this decision tree:
*
* 1. If the called value, funval, is not an object, bind |this| to undefined.
*
* 2. The nominal |this|, obj, has one of Block, Call, or DeclEnv class (this
* is what IsCacheableNonGlobalScope tests). Such objects-as-scopes must be
* censored.
*
* 3. obj is a global. There are several sub-cases:
*
* a) obj is a proxy: we try unwrapping it (see jswrapper.cpp) in order to find
* a function object inside. If the proxy is not a wrapper, or else it wraps
* a non-function, then bind |this| to undefined per ES5-strict/Harmony.
*
* [Else fall through with callee pointing to an unwrapped function object.]
*
* b) If callee is a function (after unwrapping if necessary), check whether it
* is interpreted and in strict mode. If so, then bind |this| to undefined
* per ES5 strict.
*
* c) Now check that callee is scoped by the same global object as the object
* in which its unqualified name was bound as a property. ES1-3 bound |this|
* to the name's "Reference base object", which in the context of multiple
* global objects may not be the callee's global. If globals match, bind
* |this| to undefined.
*
* This is a backward compatibility measure; see bug 634590.
*
* 4. Finally, obj is neither a declarative scope object to be censored, nor a
* global where the callee requires no backward-compatible special handling
* or future-proofing based on (explicit or imputed by Harmony status in the
* proxy case) strict mode opt-in. Bind |this| to obj->thisObject().
*
* We set *vp to undefined early to reduce code size and bias this code for the
* common and future-friendly cases.
*/
inline bool
ComputeImplicitThis(JSContext *cx, JSObject *obj, const Value &funval, Value *vp)
{
vp->setUndefined();
if (!funval.isObject())
return true;
if (!obj->isGlobal()) {
if (IsCacheableNonGlobalScope(obj))
return true;
} else {
JSObject *callee = &funval.toObject();
if (callee->isProxy()) {
callee = callee->unwrap();
if (!callee->isFunction())
return true; // treat any non-wrapped-function proxy as strict
}
if (callee->isFunction()) {
JSFunction *fun = callee->getFunctionPrivate();
if (fun->isInterpreted() && fun->inStrictMode())
return true;
}
if (callee->getGlobal() == cx->fp()->scopeChain().getGlobal())
return true;;
}
obj = obj->thisObject(cx);
if (!obj)
return false;
vp->setObject(*obj);
return true;
}
inline bool
ComputeThis(JSContext *cx, StackFrame *fp)
{
Value &thisv = fp->thisValue();
if (thisv.isObject())
return true;
if (fp->isFunctionFrame()) {
if (fp->fun()->inStrictMode())
return true;
/*
* Eval function frames have their own |this| slot, which is a copy of the function's
* |this| slot. If we lazily wrap a primitive |this| in an eval function frame, the
* eval's frame will get the wrapper, but the function's frame will not. To prevent
* this, we always wrap a function's |this| before pushing an eval frame, and should
* thus never see an unwrapped primitive in a non-strict eval function frame.
*/
JS_ASSERT(!fp->isEvalFrame());
}
return BoxNonStrictThis(cx, fp->callReceiver());
}
/*
* Return an object on which we should look for the properties of |value|.
* This helps us implement the custom [[Get]] method that ES5's GetValue
* algorithm uses for primitive values, without actually constructing the
* temporary object that the specification does.
*
* For objects, return the object itself. For string, boolean, and number
* primitive values, return the appropriate constructor's prototype. For
* undefined and null, throw an error and return NULL, attributing the
* problem to the value at |spindex| on the stack.
*/
JS_ALWAYS_INLINE JSObject *
ValuePropertyBearer(JSContext *cx, const Value &v, int spindex)
{
if (v.isObject())
return &v.toObject();
JSProtoKey protoKey;
if (v.isString()) {
protoKey = JSProto_String;
} else if (v.isNumber()) {
protoKey = JSProto_Number;
} else if (v.isBoolean()) {
protoKey = JSProto_Boolean;
} else {
JS_ASSERT(v.isNull() || v.isUndefined());
js_ReportIsNullOrUndefined(cx, spindex, v, NULL);
return NULL;
}
JSObject *pobj;
if (!js_GetClassPrototype(cx, NULL, protoKey, &pobj))
return NULL;
return pobj;
}
inline bool
ScriptPrologue(JSContext *cx, StackFrame *fp)
{
JS_ASSERT_IF(fp->isNonEvalFunctionFrame() && fp->fun()->isHeavyweight(), fp->hasCallObj());
if (fp->isConstructing()) {
JSObject *obj = js_CreateThisForFunction(cx, &fp->callee());
if (!obj)
return false;
fp->functionThis().setObject(*obj);
}
if (cx->compartment->debugMode)
ScriptDebugPrologue(cx, fp);
return true;
}
inline bool
ScriptEpilogue(JSContext *cx, StackFrame *fp, bool ok)
{
if (cx->compartment->debugMode)
ok = ScriptDebugEpilogue(cx, fp, ok);
/*
* If inline-constructing, replace primitive rval with the new object
* passed in via |this|, and instrument this constructor invocation.
*/
if (fp->isConstructing() && ok) {
if (fp->returnValue().isPrimitive())
fp->setReturnValue(ObjectValue(fp->constructorThis()));
JS_RUNTIME_METER(cx->runtime, constructs);
}
return ok;
}
inline bool
ScriptPrologueOrGeneratorResume(JSContext *cx, StackFrame *fp)
{
if (!fp->isGeneratorFrame())
return ScriptPrologue(cx, fp);
if (cx->compartment->debugMode)
ScriptDebugPrologue(cx, fp);
return true;
}
inline bool
ScriptEpilogueOrGeneratorYield(JSContext *cx, StackFrame *fp, bool ok)
{
if (!fp->isYielding())
return ScriptEpilogue(cx, fp, ok);
if (cx->compartment->debugMode)
return ScriptDebugEpilogue(cx, fp, ok);
return ok;
}
} /* namespace js */
#endif /* jsinterpinlines_h__ */