--- /dev/null Thu Jan 01 00:00:00 1970 +0000
+++ b/JavaScriptCore/interpreter/CallFrame.h Fri Sep 17 09:02:29 2010 +0300
@@ -0,0 +1,169 @@
+/*
+ * Copyright (C) 1999-2001 Harri Porten (porten@kde.org)
+ * Copyright (C) 2001 Peter Kelly (pmk@post.com)
+ * Copyright (C) 2003, 2007, 2008 Apple Inc. All rights reserved.
+ *
+ * This library is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU Library General Public
+ * License as published by the Free Software Foundation; either
+ * version 2 of the License, or (at your option) any later version.
+ *
+ * This library is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
+ * Library General Public License for more details.
+ *
+ * You should have received a copy of the GNU Library General Public License
+ * along with this library; see the file COPYING.LIB. If not, write to
+ * the Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor,
+ * Boston, MA 02110-1301, USA.
+ *
+ */
+
+#ifndef CallFrame_h
+#define CallFrame_h
+
+#include "JSGlobalData.h"
+#include "MacroAssemblerCodeRef.h"
+#include "RegisterFile.h"
+#include "ScopeChain.h"
+
+namespace JSC {
+
+ class Arguments;
+ class JSActivation;
+ class Interpreter;
+
+ // Represents the current state of script execution.
+ // Passed as the first argument to most functions.
+ class ExecState : private Register {
+ public:
+ JSObject* callee() const { return this[RegisterFile::Callee].function(); }
+ CodeBlock* codeBlock() const { return this[RegisterFile::CodeBlock].Register::codeBlock(); }
+ ScopeChainNode* scopeChain() const
+ {
+ ASSERT(this[RegisterFile::ScopeChain].Register::scopeChain());
+ return this[RegisterFile::ScopeChain].Register::scopeChain();
+ }
+
+ // Global object in which execution began.
+ JSGlobalObject* dynamicGlobalObject();
+
+ // Global object in which the currently executing code was defined.
+ // Differs from dynamicGlobalObject() during function calls across web browser frames.
+ JSGlobalObject* lexicalGlobalObject() const
+ {
+ return scopeChain()->globalObject;
+ }
+
+ // Differs from lexicalGlobalObject because this will have DOM window shell rather than
+ // the actual DOM window, which can't be "this" for security reasons.
+ JSObject* globalThisValue() const
+ {
+ return scopeChain()->globalThis;
+ }
+
+ // FIXME: Elsewhere, we use JSGlobalData* rather than JSGlobalData&.
+ // We should make this more uniform and either use a reference everywhere
+ // or a pointer everywhere.
+ JSGlobalData& globalData() const
+ {
+ ASSERT(scopeChain()->globalData);
+ return *scopeChain()->globalData;
+ }
+
+ // Convenience functions for access to global data.
+ // It takes a few memory references to get from a call frame to the global data
+ // pointer, so these are inefficient, and should be used sparingly in new code.
+ // But they're used in many places in legacy code, so they're not going away any time soon.
+
+ void clearException() { globalData().exception = JSValue(); }
+ JSValue exception() const { return globalData().exception; }
+ JSValue* exceptionSlot() { return &globalData().exception; }
+ bool hadException() const { return globalData().exception; }
+
+ const CommonIdentifiers& propertyNames() const { return *globalData().propertyNames; }
+ const MarkedArgumentBuffer& emptyList() const { return *globalData().emptyList; }
+ Interpreter* interpreter() { return globalData().interpreter; }
+ Heap* heap() { return &globalData().heap; }
+#ifndef NDEBUG
+ void dumpCaller();
+#endif
+ static const HashTable* arrayTable(CallFrame* callFrame) { return callFrame->globalData().arrayTable; }
+ static const HashTable* dateTable(CallFrame* callFrame) { return callFrame->globalData().dateTable; }
+ static const HashTable* jsonTable(CallFrame* callFrame) { return callFrame->globalData().jsonTable; }
+ static const HashTable* mathTable(CallFrame* callFrame) { return callFrame->globalData().mathTable; }
+ static const HashTable* numberTable(CallFrame* callFrame) { return callFrame->globalData().numberTable; }
+ static const HashTable* regExpTable(CallFrame* callFrame) { return callFrame->globalData().regExpTable; }
+ static const HashTable* regExpConstructorTable(CallFrame* callFrame) { return callFrame->globalData().regExpConstructorTable; }
+ static const HashTable* stringTable(CallFrame* callFrame) { return callFrame->globalData().stringTable; }
+
+ static CallFrame* create(Register* callFrameBase) { return static_cast<CallFrame*>(callFrameBase); }
+ Register* registers() { return this; }
+
+ CallFrame& operator=(const Register& r) { *static_cast<Register*>(this) = r; return *this; }
+
+ CallFrame* callerFrame() const { return this[RegisterFile::CallerFrame].callFrame(); }
+#if ENABLE(JIT)
+ ReturnAddressPtr returnPC() const { return ReturnAddressPtr(this[RegisterFile::ReturnPC].vPC()); }
+#endif
+#if ENABLE(INTERPRETER)
+ Instruction* returnVPC() const { return this[RegisterFile::ReturnPC].vPC(); }
+#endif
+
+ void setCallerFrame(CallFrame* callerFrame) { static_cast<Register*>(this)[RegisterFile::CallerFrame] = callerFrame; }
+ void setScopeChain(ScopeChainNode* scopeChain) { static_cast<Register*>(this)[RegisterFile::ScopeChain] = scopeChain; }
+
+ ALWAYS_INLINE void init(CodeBlock* codeBlock, Instruction* vPC, ScopeChainNode* scopeChain,
+ CallFrame* callerFrame, int argc, JSObject* callee)
+ {
+ ASSERT(callerFrame); // Use noCaller() rather than 0 for the outer host call frame caller.
+ ASSERT(callerFrame == noCaller() || callerFrame->removeHostCallFrameFlag()->registerFile()->end() >= this);
+
+ setCodeBlock(codeBlock);
+ setScopeChain(scopeChain);
+ setCallerFrame(callerFrame);
+ setReturnPC(vPC); // This is either an Instruction* or a pointer into JIT generated code stored as an Instruction*.
+ setArgumentCountIncludingThis(argc); // original argument count (for the sake of the "arguments" object)
+ setCallee(callee);
+ }
+
+ // Read a register from the codeframe (or constant from the CodeBlock).
+ inline Register& r(int);
+
+ // Access to arguments.
+ int hostThisRegister() { return -RegisterFile::CallFrameHeaderSize - argumentCountIncludingThis(); }
+ JSValue hostThisValue() { return this[hostThisRegister()].jsValue(); }
+ size_t argumentCount() const { return argumentCountIncludingThis() - 1; }
+ size_t argumentCountIncludingThis() const { return this[RegisterFile::ArgumentCount].i(); }
+ JSValue argument(int argumentNumber)
+ {
+ int argumentIndex = -RegisterFile::CallFrameHeaderSize - this[RegisterFile::ArgumentCount].i() + argumentNumber + 1;
+ if (argumentIndex >= -RegisterFile::CallFrameHeaderSize)
+ return jsUndefined();
+ return this[argumentIndex].jsValue();
+ }
+
+ static CallFrame* noCaller() { return reinterpret_cast<CallFrame*>(HostCallFrameFlag); }
+
+ bool hasHostCallFrameFlag() const { return reinterpret_cast<intptr_t>(this) & HostCallFrameFlag; }
+ CallFrame* addHostCallFrameFlag() const { return reinterpret_cast<CallFrame*>(reinterpret_cast<intptr_t>(this) | HostCallFrameFlag); }
+ CallFrame* removeHostCallFrameFlag() { return reinterpret_cast<CallFrame*>(reinterpret_cast<intptr_t>(this) & ~HostCallFrameFlag); }
+
+ void setArgumentCountIncludingThis(int count) { static_cast<Register*>(this)[RegisterFile::ArgumentCount] = Register::withInt(count); }
+ void setCallee(JSObject* callee) { static_cast<Register*>(this)[RegisterFile::Callee] = Register::withCallee(callee); }
+ void setCodeBlock(CodeBlock* codeBlock) { static_cast<Register*>(this)[RegisterFile::CodeBlock] = codeBlock; }
+ void setReturnPC(void* value) { static_cast<Register*>(this)[RegisterFile::ReturnPC] = (Instruction*)value; }
+
+ private:
+ static const intptr_t HostCallFrameFlag = 1;
+#ifndef NDEBUG
+ RegisterFile* registerFile();
+#endif
+ ExecState();
+ ~ExecState();
+ };
+
+} // namespace JSC
+
+#endif // CallFrame_h