Imported WebKit commit 2ea9d364d0f6efa8fa64acf19f451504c59be0e4 (http://svn.webkit.org/repository/webkit/trunk@104285)

1 files changed, 221 insertions, 0 deletions

diff --git a/Source/JavaScriptCore/interpreter/Interpreter.h b/Source/JavaScriptCore/interpreter/Interpreter.h
new file mode 100644
index 000000000..368fa27f2
--- /dev/null
+++ b/Source/JavaScriptCore/interpreter/Interpreter.h
@@ -0,0 +1,221 @@
+/*
+ * Copyright (C) 2008 Apple Inc. All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ *
+ * 1.  Redistributions of source code must retain the above copyright
+ *     notice, this list of conditions and the following disclaimer.
+ * 2.  Redistributions in binary form must reproduce the above copyright
+ *     notice, this list of conditions and the following disclaimer in the
+ *     documentation and/or other materials provided with the distribution.
+ * 3.  Neither the name of Apple Computer, Inc. ("Apple") nor the names of
+ *     its contributors may be used to endorse or promote products derived
+ *     from this software without specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY APPLE AND ITS CONTRIBUTORS "AS IS" AND ANY
+ * EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
+ * WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
+ * DISCLAIMED. IN NO EVENT SHALL APPLE OR ITS CONTRIBUTORS BE LIABLE FOR ANY
+ * DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
+ * (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
+ * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
+ * ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+ * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
+ * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+ */
+
+#ifndef Interpreter_h
+#define Interpreter_h
+
+#include "ArgList.h"
+#include "JSCell.h"
+#include "JSValue.h"
+#include "JSObject.h"
+#include "Opcode.h"
+#include "RegisterFile.h"
+
+#include <wtf/HashMap.h>
+
+namespace JSC {
+
+    class CodeBlock;
+    class EvalExecutable;
+    class FunctionExecutable;
+    class JSFunction;
+    class JSGlobalObject;
+    class ProgramExecutable;
+    class Register;
+    class ScopeChainNode;
+    class SamplingTool;
+    struct CallFrameClosure;
+    struct HandlerInfo;
+    struct Instruction;
+    
+    enum DebugHookID {
+        WillExecuteProgram,
+        DidExecuteProgram,
+        DidEnterCallFrame,
+        DidReachBreakpoint,
+        WillLeaveCallFrame,
+        WillExecuteStatement
+    };
+
+    class TopCallFrameSetter {
+    public:
+        TopCallFrameSetter(JSGlobalData& global, CallFrame* callFrame)
+            : globalData(global)
+            , oldCallFrame(global.topCallFrame) 
+        {
+            global.topCallFrame = callFrame;
+        }
+        
+        ~TopCallFrameSetter() 
+        {
+            globalData.topCallFrame = oldCallFrame;
+        }
+    private:
+        JSGlobalData& globalData;
+        CallFrame* oldCallFrame;
+    };
+
+#if PLATFORM(IOS)
+    // We use a smaller reentrancy limit on iPhone because of the high amount of
+    // stack space required on the web thread.
+    enum { MaxLargeThreadReentryDepth = 93, MaxSmallThreadReentryDepth = 16 };
+#else
+    enum { MaxLargeThreadReentryDepth = 256, MaxSmallThreadReentryDepth = 16 };
+#endif // PLATFORM(IOS)
+
+    class Interpreter {
+        WTF_MAKE_FAST_ALLOCATED;
+        friend class JIT;
+        friend class CachedCall;
+    public:
+        Interpreter();
+        
+        void initialize(bool canUseJIT);
+
+        RegisterFile& registerFile() { return m_registerFile; }
+        
+        Opcode getOpcode(OpcodeID id)
+        {
+            ASSERT(m_initialized);
+#if ENABLE(COMPUTED_GOTO_INTERPRETER)
+            return m_opcodeTable[id];
+#else
+            return id;
+#endif
+        }
+
+        OpcodeID getOpcodeID(Opcode opcode)
+        {
+            ASSERT(m_initialized);
+#if ENABLE(COMPUTED_GOTO_INTERPRETER)
+            ASSERT(isOpcode(opcode));
+            if (!m_enabled) {
+                OpcodeID result = static_cast<OpcodeID>(bitwise_cast<uintptr_t>(opcode));
+                ASSERT(result == m_opcodeIDTable.get(opcode));
+                return result;
+            }
+            return m_opcodeIDTable.get(opcode);
+#else
+            return opcode;
+#endif
+        }
+
+        bool isOpcode(Opcode);
+
+        JSValue execute(ProgramExecutable*, CallFrame*, ScopeChainNode*, JSObject* thisObj);
+        JSValue executeCall(CallFrame*, JSObject* function, CallType, const CallData&, JSValue thisValue, const ArgList&);
+        JSObject* executeConstruct(CallFrame*, JSObject* function, ConstructType, const ConstructData&, const ArgList&);
+        JSValue execute(EvalExecutable*, CallFrame*, JSValue thisValue, ScopeChainNode*);
+        JSValue execute(EvalExecutable*, CallFrame*, JSValue thisValue, ScopeChainNode*, int globalRegisterOffset);
+
+        JSValue retrieveArguments(CallFrame*, JSFunction*) const;
+        JS_EXPORT_PRIVATE JSValue retrieveCaller(CallFrame*, JSFunction*) const;
+        JS_EXPORT_PRIVATE void retrieveLastCaller(CallFrame*, int& lineNumber, intptr_t& sourceID, UString& sourceURL, JSValue& function) const;
+        
+        void getArgumentsData(CallFrame*, JSFunction*&, ptrdiff_t& firstParameterIndex, Register*& argv, int& argc);
+        
+        SamplingTool* sampler() { return m_sampler.get(); }
+
+        NEVER_INLINE HandlerInfo* throwException(CallFrame*&, JSValue&, unsigned bytecodeOffset);
+        NEVER_INLINE void debug(CallFrame*, DebugHookID, int firstLine, int lastLine);
+
+        void dumpSampleData(ExecState* exec);
+        void startSampling();
+        void stopSampling();
+    private:
+        enum ExecutionFlag { Normal, InitializeAndReturn };
+
+        CallFrameClosure prepareForRepeatCall(FunctionExecutable*, CallFrame*, JSFunction*, int argumentCountIncludingThis, ScopeChainNode*);
+        void endRepeatCall(CallFrameClosure&);
+        JSValue execute(CallFrameClosure&);
+
+#if ENABLE(INTERPRETER)
+        NEVER_INLINE bool resolve(CallFrame*, Instruction*, JSValue& exceptionValue);
+        NEVER_INLINE bool resolveSkip(CallFrame*, Instruction*, JSValue& exceptionValue);
+        NEVER_INLINE bool resolveGlobal(CallFrame*, Instruction*, JSValue& exceptionValue);
+        NEVER_INLINE bool resolveGlobalDynamic(CallFrame*, Instruction*, JSValue& exceptionValue);
+        NEVER_INLINE void resolveBase(CallFrame*, Instruction* vPC);
+        NEVER_INLINE bool resolveBaseAndProperty(CallFrame*, Instruction*, JSValue& exceptionValue);
+        NEVER_INLINE bool resolveThisAndProperty(CallFrame*, Instruction*, JSValue& exceptionValue);
+        NEVER_INLINE ScopeChainNode* createExceptionScope(CallFrame*, const Instruction* vPC);
+
+        void tryCacheGetByID(CallFrame*, CodeBlock*, Instruction*, JSValue baseValue, const Identifier& propertyName, const PropertySlot&);
+        void uncacheGetByID(CodeBlock*, Instruction* vPC);
+        void tryCachePutByID(CallFrame*, CodeBlock*, Instruction*, JSValue baseValue, const PutPropertySlot&);
+        void uncachePutByID(CodeBlock*, Instruction* vPC);        
+#endif // ENABLE(INTERPRETER)
+
+        NEVER_INLINE bool unwindCallFrame(CallFrame*&, JSValue, unsigned& bytecodeOffset, CodeBlock*&);
+
+        static ALWAYS_INLINE CallFrame* slideRegisterWindowForCall(CodeBlock*, RegisterFile*, CallFrame*, size_t registerOffset, int argc);
+
+        static CallFrame* findFunctionCallFrame(CallFrame*, JSFunction*);
+
+        JSValue privateExecute(ExecutionFlag, RegisterFile*, CallFrame*);
+
+        void dumpCallFrame(CallFrame*);
+        void dumpRegisters(CallFrame*);
+        
+        bool isCallBytecode(Opcode opcode) { return opcode == getOpcode(op_call) || opcode == getOpcode(op_construct) || opcode == getOpcode(op_call_eval); }
+
+        void enableSampler();
+        int m_sampleEntryDepth;
+        OwnPtr<SamplingTool> m_sampler;
+
+        int m_reentryDepth;
+
+        RegisterFile m_registerFile;
+        
+#if ENABLE(COMPUTED_GOTO_INTERPRETER)
+        Opcode m_opcodeTable[numOpcodeIDs]; // Maps OpcodeID => Opcode for compiling
+        HashMap<Opcode, OpcodeID> m_opcodeIDTable; // Maps Opcode => OpcodeID for decompiling
+#endif
+
+#if !ASSERT_DISABLED
+        bool m_initialized;
+#endif
+        bool m_enabled;
+    };
+
+    // This value must not be an object that would require this conversion (WebCore's global object).
+    inline bool isValidThisObject(JSValue thisValue, ExecState* exec)
+    {
+        return !thisValue.isObject() || thisValue.toThisObject(exec) == thisValue;
+    }
+
+    inline JSValue Interpreter::execute(EvalExecutable* eval, CallFrame* callFrame, JSValue thisValue, ScopeChainNode* scopeChain)
+    {
+        return execute(eval, callFrame, thisValue, scopeChain, m_registerFile.size() + 1 + RegisterFile::CallFrameHeaderSize);
+    }
+
+    JSValue eval(CallFrame*);
+    CallFrame* loadVarargs(CallFrame*, RegisterFile*, JSValue thisValue, JSValue arguments, int firstFreeRegister);
+
+} // namespace JSC
+
+#endif // Interpreter_h