| /* |
| * Copyright (C) 2008, 2009, 2012-2015 Apple Inc. All rights reserved. |
| * Copyright (C) 2008 Cameron Zwarich <cwzwarich@uwaterloo.ca> |
| * Copyright (C) 2012 Igalia, S.L. |
| * |
| * 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 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 BytecodeGenerator_h |
| #define BytecodeGenerator_h |
| |
| #include "CodeBlock.h" |
| #include <wtf/HashTraits.h> |
| #include "Instruction.h" |
| #include "Label.h" |
| #include "LabelScope.h" |
| #include "Interpreter.h" |
| #include "ParserError.h" |
| #include "RegisterID.h" |
| #include "SymbolTable.h" |
| #include "Debugger.h" |
| #include "Nodes.h" |
| #include "StaticPropertyAnalyzer.h" |
| #include "UnlinkedCodeBlock.h" |
| |
| #include <functional> |
| |
| #include <wtf/PassRefPtr.h> |
| #include <wtf/SegmentedVector.h> |
| #include <wtf/Vector.h> |
| |
| |
| namespace JSC { |
| |
| class Identifier; |
| |
| enum ExpectedFunction { |
| NoExpectedFunction, |
| ExpectObjectConstructor, |
| ExpectArrayConstructor |
| }; |
| |
| class CallArguments { |
| public: |
| CallArguments(BytecodeGenerator&, ArgumentsNode*, unsigned additionalArguments = 0); |
| |
| RegisterID* thisRegister() { return m_argv[0].get(); } |
| RegisterID* argumentRegister(unsigned i) { return m_argv[i + 1].get(); } |
| unsigned stackOffset() { return -m_argv[0]->index() + JSStack::CallFrameHeaderSize; } |
| unsigned argumentCountIncludingThis() { return m_argv.size() - m_padding; } |
| RegisterID* profileHookRegister() { return m_profileHookRegister.get(); } |
| ArgumentsNode* argumentsNode() { return m_argumentsNode; } |
| |
| private: |
| RefPtr<RegisterID> m_profileHookRegister; |
| ArgumentsNode* m_argumentsNode; |
| Vector<RefPtr<RegisterID>, 8, UnsafeVectorOverflow> m_argv; |
| unsigned m_padding; |
| }; |
| |
| struct FinallyContext { |
| StatementNode* finallyBlock; |
| unsigned scopeContextStackSize; |
| unsigned switchContextStackSize; |
| unsigned forInContextStackSize; |
| unsigned tryContextStackSize; |
| unsigned labelScopesSize; |
| int finallyDepth; |
| int dynamicScopeDepth; |
| }; |
| |
| struct ControlFlowContext { |
| bool isFinallyBlock; |
| FinallyContext finallyContext; |
| }; |
| |
| class ForInContext { |
| public: |
| ForInContext(RegisterID* localRegister) |
| : m_localRegister(localRegister) |
| , m_isValid(true) |
| { |
| } |
| |
| virtual ~ForInContext() |
| { |
| } |
| |
| bool isValid() const { return m_isValid; } |
| void invalidate() { m_isValid = false; } |
| |
| enum ForInContextType { |
| StructureForInContextType, |
| IndexedForInContextType |
| }; |
| virtual ForInContextType type() const = 0; |
| |
| RegisterID* local() const { return m_localRegister.get(); } |
| |
| private: |
| RefPtr<RegisterID> m_localRegister; |
| bool m_isValid; |
| }; |
| |
| class StructureForInContext : public ForInContext { |
| public: |
| StructureForInContext(RegisterID* localRegister, RegisterID* indexRegister, RegisterID* propertyRegister, RegisterID* enumeratorRegister) |
| : ForInContext(localRegister) |
| , m_indexRegister(indexRegister) |
| , m_propertyRegister(propertyRegister) |
| , m_enumeratorRegister(enumeratorRegister) |
| { |
| } |
| |
| virtual ForInContextType type() const |
| { |
| return StructureForInContextType; |
| } |
| |
| RegisterID* index() const { return m_indexRegister.get(); } |
| RegisterID* property() const { return m_propertyRegister.get(); } |
| RegisterID* enumerator() const { return m_enumeratorRegister.get(); } |
| |
| private: |
| RefPtr<RegisterID> m_indexRegister; |
| RefPtr<RegisterID> m_propertyRegister; |
| RefPtr<RegisterID> m_enumeratorRegister; |
| }; |
| |
| class IndexedForInContext : public ForInContext { |
| public: |
| IndexedForInContext(RegisterID* localRegister, RegisterID* indexRegister) |
| : ForInContext(localRegister) |
| , m_indexRegister(indexRegister) |
| { |
| } |
| |
| virtual ForInContextType type() const |
| { |
| return IndexedForInContextType; |
| } |
| |
| RegisterID* index() const { return m_indexRegister.get(); } |
| |
| private: |
| RefPtr<RegisterID> m_indexRegister; |
| }; |
| |
| struct TryData { |
| RefPtr<Label> target; |
| unsigned targetScopeDepth; |
| }; |
| |
| struct TryContext { |
| RefPtr<Label> start; |
| TryData* tryData; |
| }; |
| |
| class Variable { |
| public: |
| enum VariableKind { NormalVariable, SpecialVariable }; |
| |
| Variable() |
| : m_offset() |
| , m_local(nullptr) |
| , m_attributes(0) |
| , m_kind(NormalVariable) |
| { |
| } |
| |
| Variable(const Identifier& ident) |
| : m_ident(ident) |
| , m_local(nullptr) |
| , m_attributes(0) |
| , m_kind(NormalVariable) // This is somewhat meaningless here for this kind of Variable. |
| { |
| } |
| |
| Variable(const Identifier& ident, VarOffset offset, RegisterID* local, unsigned attributes, VariableKind kind) |
| : m_ident(ident) |
| , m_offset(offset) |
| , m_local(local) |
| , m_attributes(attributes) |
| , m_kind(kind) |
| { |
| } |
| |
| // If it's unset, then it is a non-locally-scoped variable. If it is set, then it could be |
| // a stack variable, a scoped variable in the local scope, or a variable captured in the |
| // direct arguments object. |
| bool isResolved() const { return !!m_offset; } |
| |
| const Identifier& ident() const { return m_ident; } |
| |
| VarOffset offset() const { return m_offset; } |
| bool isLocal() const { return m_offset.isStack(); } |
| RegisterID* local() const { return m_local; } |
| |
| bool isReadOnly() const { return m_attributes & ReadOnly; } |
| bool isSpecial() const { return m_kind != NormalVariable; } |
| |
| private: |
| Identifier m_ident; |
| VarOffset m_offset; |
| RegisterID* m_local; |
| unsigned m_attributes; |
| VariableKind m_kind; |
| }; |
| |
| struct TryRange { |
| RefPtr<Label> start; |
| RefPtr<Label> end; |
| TryData* tryData; |
| }; |
| |
| enum ProfileTypeBytecodeFlag { |
| ProfileTypeBytecodePutToScope, |
| ProfileTypeBytecodeGetFromScope, |
| ProfileTypeBytecodePutToLocalScope, |
| ProfileTypeBytecodeGetFromLocalScope, |
| ProfileTypeBytecodeHasGlobalID, |
| ProfileTypeBytecodeDoesNotHaveGlobalID, |
| ProfileTypeBytecodeFunctionArgument, |
| ProfileTypeBytecodeFunctionReturnStatement |
| }; |
| |
| class BytecodeGenerator { |
| WTF_MAKE_FAST_ALLOCATED; |
| WTF_MAKE_NONCOPYABLE(BytecodeGenerator); |
| public: |
| typedef DeclarationStacks::VarStack VarStack; |
| typedef DeclarationStacks::FunctionStack FunctionStack; |
| |
| BytecodeGenerator(VM&, ProgramNode*, UnlinkedProgramCodeBlock*, DebuggerMode, ProfilerMode); |
| BytecodeGenerator(VM&, FunctionNode*, UnlinkedFunctionCodeBlock*, DebuggerMode, ProfilerMode); |
| BytecodeGenerator(VM&, EvalNode*, UnlinkedEvalCodeBlock*, DebuggerMode, ProfilerMode); |
| |
| ~BytecodeGenerator(); |
| |
| VM* vm() const { return m_vm; } |
| ParserArena& parserArena() const { return m_scopeNode->parserArena(); } |
| const CommonIdentifiers& propertyNames() const { return *m_vm->propertyNames; } |
| |
| bool isConstructor() const { return m_codeBlock->isConstructor(); } |
| #if ENABLE(ES6_CLASS_SYNTAX) |
| ConstructorKind constructorKind() const { return m_codeBlock->constructorKind(); } |
| #else |
| ConstructorKind constructorKind() const { return ConstructorKind::None; } |
| #endif |
| |
| ParserError generate(); |
| |
| bool isArgumentNumber(const Identifier&, int); |
| |
| void setIsNumericCompareFunction(bool isNumericCompareFunction); |
| |
| Variable variable(const Identifier&); |
| |
| // Ignores the possibility of intervening scopes. |
| Variable variablePerSymbolTable(const Identifier&); |
| |
| enum ExistingVariableMode { VerifyExisting, IgnoreExisting }; |
| void createVariable(const Identifier&, VarKind, ConstantMode, ExistingVariableMode = VerifyExisting); // Creates the variable, or asserts that the already-created variable is sufficiently compatible. |
| |
| // Returns the register storing "this" |
| RegisterID* thisRegister() { return &m_thisRegister; } |
| RegisterID* argumentsRegister() { return m_argumentsRegister; } |
| RegisterID* newTarget() { return m_newTargetRegister; } |
| |
| RegisterID* scopeRegister() { return m_scopeRegister; } |
| |
| // Returns the next available temporary register. Registers returned by |
| // newTemporary require a modified form of reference counting: any |
| // register with a refcount of 0 is considered "available", meaning that |
| // the next instruction may overwrite it. |
| RegisterID* newTemporary(); |
| |
| // The same as newTemporary(), but this function returns "suggestion" if |
| // "suggestion" is a temporary. This function is helpful in situations |
| // where you've put "suggestion" in a RefPtr, but you'd like to allow |
| // the next instruction to overwrite it anyway. |
| RegisterID* newTemporaryOr(RegisterID* suggestion) { return suggestion->isTemporary() ? suggestion : newTemporary(); } |
| |
| // Functions for handling of dst register |
| |
| RegisterID* ignoredResult() { return &m_ignoredResultRegister; } |
| |
| // Returns a place to write intermediate values of an operation |
| // which reuses dst if it is safe to do so. |
| RegisterID* tempDestination(RegisterID* dst) |
| { |
| return (dst && dst != ignoredResult() && dst->isTemporary()) ? dst : newTemporary(); |
| } |
| |
| // Returns the place to write the final output of an operation. |
| RegisterID* finalDestination(RegisterID* originalDst, RegisterID* tempDst = 0) |
| { |
| if (originalDst && originalDst != ignoredResult()) |
| return originalDst; |
| ASSERT(tempDst != ignoredResult()); |
| if (tempDst && tempDst->isTemporary()) |
| return tempDst; |
| return newTemporary(); |
| } |
| |
| RegisterID* destinationForAssignResult(RegisterID* dst) |
| { |
| if (dst && dst != ignoredResult() && m_codeBlock->needsFullScopeChain()) |
| return dst->isTemporary() ? dst : newTemporary(); |
| return 0; |
| } |
| |
| // Moves src to dst if dst is not null and is different from src, otherwise just returns src. |
| RegisterID* moveToDestinationIfNeeded(RegisterID* dst, RegisterID* src) |
| { |
| return dst == ignoredResult() ? 0 : (dst && dst != src) ? emitMove(dst, src) : src; |
| } |
| |
| LabelScopePtr newLabelScope(LabelScope::Type, const Identifier* = 0); |
| PassRefPtr<Label> newLabel(); |
| |
| void emitNode(RegisterID* dst, StatementNode* n) |
| { |
| // Node::emitCode assumes that dst, if provided, is either a local or a referenced temporary. |
| ASSERT(!dst || dst == ignoredResult() || !dst->isTemporary() || dst->refCount()); |
| if (!m_vm->isSafeToRecurse()) { |
| emitThrowExpressionTooDeepException(); |
| return; |
| } |
| n->emitBytecode(*this, dst); |
| } |
| |
| void emitNode(StatementNode* n) |
| { |
| emitNode(0, n); |
| } |
| |
| RegisterID* emitNode(RegisterID* dst, ExpressionNode* n) |
| { |
| // Node::emitCode assumes that dst, if provided, is either a local or a referenced temporary. |
| ASSERT(!dst || dst == ignoredResult() || !dst->isTemporary() || dst->refCount()); |
| if (!m_vm->isSafeToRecurse()) |
| return emitThrowExpressionTooDeepException(); |
| return n->emitBytecode(*this, dst); |
| } |
| |
| RegisterID* emitNode(ExpressionNode* n) |
| { |
| return emitNode(0, n); |
| } |
| |
| void emitNodeInConditionContext(ExpressionNode* n, Label* trueTarget, Label* falseTarget, FallThroughMode fallThroughMode) |
| { |
| if (!m_vm->isSafeToRecurse()) { |
| emitThrowExpressionTooDeepException(); |
| return; |
| } |
| |
| n->emitBytecodeInConditionContext(*this, trueTarget, falseTarget, fallThroughMode); |
| } |
| |
| void emitExpressionInfo(const JSTextPosition& divot, const JSTextPosition& divotStart, const JSTextPosition& divotEnd) |
| { |
| ASSERT(divot.offset >= divotStart.offset); |
| ASSERT(divotEnd.offset >= divot.offset); |
| |
| int sourceOffset = m_scopeNode->source().startOffset(); |
| unsigned firstLine = m_scopeNode->source().firstLine(); |
| |
| int divotOffset = divot.offset - sourceOffset; |
| int startOffset = divot.offset - divotStart.offset; |
| int endOffset = divotEnd.offset - divot.offset; |
| |
| unsigned line = divot.line; |
| ASSERT(line >= firstLine); |
| line -= firstLine; |
| |
| int lineStart = divot.lineStartOffset; |
| if (lineStart > sourceOffset) |
| lineStart -= sourceOffset; |
| else |
| lineStart = 0; |
| |
| if (divotOffset < lineStart) |
| return; |
| |
| unsigned column = divotOffset - lineStart; |
| |
| unsigned instructionOffset = instructions().size(); |
| if (!m_isBuiltinFunction) |
| m_codeBlock->addExpressionInfo(instructionOffset, divotOffset, startOffset, endOffset, line, column); |
| } |
| |
| |
| ALWAYS_INLINE bool leftHandSideNeedsCopy(bool rightHasAssignments, bool rightIsPure) |
| { |
| return (m_codeType != FunctionCode || m_codeBlock->needsFullScopeChain() || rightHasAssignments) && !rightIsPure; |
| } |
| |
| ALWAYS_INLINE PassRefPtr<RegisterID> emitNodeForLeftHandSide(ExpressionNode* n, bool rightHasAssignments, bool rightIsPure) |
| { |
| if (leftHandSideNeedsCopy(rightHasAssignments, rightIsPure)) { |
| PassRefPtr<RegisterID> dst = newTemporary(); |
| emitNode(dst.get(), n); |
| return dst; |
| } |
| |
| return emitNode(n); |
| } |
| |
| void emitTypeProfilerExpressionInfo(const JSTextPosition& startDivot, const JSTextPosition& endDivot); |
| void emitProfileType(RegisterID* registerToProfile, ProfileTypeBytecodeFlag, const Identifier*); |
| |
| void emitProfileControlFlow(int); |
| |
| RegisterID* emitLoad(RegisterID* dst, bool); |
| RegisterID* emitLoad(RegisterID* dst, const Identifier&); |
| RegisterID* emitLoad(RegisterID* dst, JSValue, SourceCodeRepresentation = SourceCodeRepresentation::Other); |
| RegisterID* emitLoadGlobalObject(RegisterID* dst); |
| |
| RegisterID* emitUnaryOp(OpcodeID, RegisterID* dst, RegisterID* src); |
| RegisterID* emitBinaryOp(OpcodeID, RegisterID* dst, RegisterID* src1, RegisterID* src2, OperandTypes); |
| RegisterID* emitEqualityOp(OpcodeID, RegisterID* dst, RegisterID* src1, RegisterID* src2); |
| RegisterID* emitUnaryNoDstOp(OpcodeID, RegisterID* src); |
| |
| RegisterID* emitCreateThis(RegisterID* dst); |
| void emitTDZCheck(RegisterID* target); |
| RegisterID* emitNewObject(RegisterID* dst); |
| RegisterID* emitNewArray(RegisterID* dst, ElementNode*, unsigned length); // stops at first elision |
| |
| RegisterID* emitNewFunction(RegisterID* dst, FunctionBodyNode*); |
| RegisterID* emitNewFunctionInternal(RegisterID* dst, unsigned index); |
| RegisterID* emitNewFunctionExpression(RegisterID* dst, FuncExprNode* func); |
| RegisterID* emitNewDefaultConstructor(RegisterID* dst, ConstructorKind, const Identifier& name); |
| RegisterID* emitNewRegExp(RegisterID* dst, RegExp*); |
| |
| RegisterID* emitMove(RegisterID* dst, RegisterID* src); |
| |
| RegisterID* emitToNumber(RegisterID* dst, RegisterID* src) { return emitUnaryOp(op_to_number, dst, src); } |
| RegisterID* emitInc(RegisterID* srcDst); |
| RegisterID* emitDec(RegisterID* srcDst); |
| |
| void emitCheckHasInstance(RegisterID* dst, RegisterID* value, RegisterID* base, Label* target); |
| RegisterID* emitInstanceOf(RegisterID* dst, RegisterID* value, RegisterID* basePrototype); |
| RegisterID* emitTypeOf(RegisterID* dst, RegisterID* src) { return emitUnaryOp(op_typeof, dst, src); } |
| RegisterID* emitIn(RegisterID* dst, RegisterID* property, RegisterID* base) { return emitBinaryOp(op_in, dst, property, base, OperandTypes()); } |
| |
| RegisterID* emitInitGlobalConst(const Identifier&, RegisterID* value); |
| |
| RegisterID* emitGetById(RegisterID* dst, RegisterID* base, const Identifier& property); |
| RegisterID* emitPutById(RegisterID* base, const Identifier& property, RegisterID* value); |
| RegisterID* emitDirectPutById(RegisterID* base, const Identifier& property, RegisterID* value, PropertyNode::PutType); |
| RegisterID* emitDeleteById(RegisterID* dst, RegisterID* base, const Identifier&); |
| RegisterID* emitGetByVal(RegisterID* dst, RegisterID* base, RegisterID* property); |
| RegisterID* emitGetArgumentByVal(RegisterID* dst, RegisterID* base, RegisterID* property); |
| RegisterID* emitPutByVal(RegisterID* base, RegisterID* property, RegisterID* value); |
| RegisterID* emitDirectPutByVal(RegisterID* base, RegisterID* property, RegisterID* value); |
| RegisterID* emitDeleteByVal(RegisterID* dst, RegisterID* base, RegisterID* property); |
| RegisterID* emitPutByIndex(RegisterID* base, unsigned index, RegisterID* value); |
| void emitPutGetterSetter(RegisterID* base, const Identifier& property, RegisterID* getter, RegisterID* setter); |
| |
| ExpectedFunction expectedFunctionForIdentifier(const Identifier&); |
| RegisterID* emitCall(RegisterID* dst, RegisterID* func, ExpectedFunction, CallArguments&, const JSTextPosition& divot, const JSTextPosition& divotStart, const JSTextPosition& divotEnd); |
| RegisterID* emitCallEval(RegisterID* dst, RegisterID* func, CallArguments&, const JSTextPosition& divot, const JSTextPosition& divotStart, const JSTextPosition& divotEnd); |
| RegisterID* emitCallVarargs(RegisterID* dst, RegisterID* func, RegisterID* thisRegister, RegisterID* arguments, RegisterID* firstFreeRegister, int32_t firstVarArgOffset, RegisterID* profileHookRegister, const JSTextPosition& divot, const JSTextPosition& divotStart, const JSTextPosition& divotEnd); |
| |
| void emitEnumeration(ThrowableExpressionData* enumerationNode, ExpressionNode* subjectNode, const std::function<void(BytecodeGenerator&, RegisterID*)>& callBack); |
| |
| RegisterID* emitReturn(RegisterID* src); |
| RegisterID* emitEnd(RegisterID* src) { return emitUnaryNoDstOp(op_end, src); } |
| |
| RegisterID* emitConstruct(RegisterID* dst, RegisterID* func, ExpectedFunction, CallArguments&, const JSTextPosition& divot, const JSTextPosition& divotStart, const JSTextPosition& divotEnd); |
| RegisterID* emitStrcat(RegisterID* dst, RegisterID* src, int count); |
| void emitToPrimitive(RegisterID* dst, RegisterID* src); |
| |
| ResolveType resolveType(); |
| RegisterID* emitResolveConstantLocal(RegisterID* dst, const Variable&); |
| RegisterID* emitResolveScope(RegisterID* dst, const Variable&); |
| RegisterID* emitGetFromScope(RegisterID* dst, RegisterID* scope, const Variable&, ResolveMode); |
| RegisterID* emitPutToScope(RegisterID* scope, const Variable&, RegisterID* value, ResolveMode); |
| RegisterID* initializeVariable(const Variable&, RegisterID* value); |
| |
| PassRefPtr<Label> emitLabel(Label*); |
| void emitLoopHint(); |
| PassRefPtr<Label> emitJump(Label* target); |
| PassRefPtr<Label> emitJumpIfTrue(RegisterID* cond, Label* target); |
| PassRefPtr<Label> emitJumpIfFalse(RegisterID* cond, Label* target); |
| PassRefPtr<Label> emitJumpIfNotFunctionCall(RegisterID* cond, Label* target); |
| PassRefPtr<Label> emitJumpIfNotFunctionApply(RegisterID* cond, Label* target); |
| void emitPopScopes(RegisterID* srcDst, int targetScopeDepth); |
| |
| RegisterID* emitHasIndexedProperty(RegisterID* dst, RegisterID* base, RegisterID* propertyName); |
| RegisterID* emitHasStructureProperty(RegisterID* dst, RegisterID* base, RegisterID* propertyName, RegisterID* enumerator); |
| RegisterID* emitHasGenericProperty(RegisterID* dst, RegisterID* base, RegisterID* propertyName); |
| RegisterID* emitGetPropertyEnumerator(RegisterID* dst, RegisterID* base); |
| RegisterID* emitGetEnumerableLength(RegisterID* dst, RegisterID* base); |
| RegisterID* emitGetStructurePropertyEnumerator(RegisterID* dst, RegisterID* base, RegisterID* length); |
| RegisterID* emitGetGenericPropertyEnumerator(RegisterID* dst, RegisterID* base, RegisterID* length, RegisterID* structureEnumerator); |
| RegisterID* emitEnumeratorStructurePropertyName(RegisterID* dst, RegisterID* enumerator, RegisterID* index); |
| RegisterID* emitEnumeratorGenericPropertyName(RegisterID* dst, RegisterID* enumerator, RegisterID* index); |
| RegisterID* emitToIndexString(RegisterID* dst, RegisterID* index); |
| |
| RegisterID* emitIsObject(RegisterID* dst, RegisterID* src); |
| RegisterID* emitIsUndefined(RegisterID* dst, RegisterID* src); |
| |
| void emitReadOnlyExceptionIfNeeded(); |
| |
| // Start a try block. 'start' must have been emitted. |
| TryData* pushTry(Label* start); |
| // End a try block. 'end' must have been emitted. |
| RegisterID* popTryAndEmitCatch(TryData*, RegisterID* targetRegister, Label* end); |
| |
| void emitThrow(RegisterID* exc) |
| { |
| m_usesExceptions = true; |
| emitUnaryNoDstOp(op_throw, exc); |
| } |
| |
| void emitThrowReferenceError(const String& message); |
| void emitThrowTypeError(const String& message); |
| |
| void emitPushFunctionNameScope(RegisterID* dst, const Identifier& property, RegisterID* value, unsigned attributes); |
| void emitPushCatchScope(RegisterID* dst, const Identifier& property, RegisterID* value, unsigned attributes); |
| |
| void emitGetScope(); |
| RegisterID* emitPushWithScope(RegisterID* dst, RegisterID* scope); |
| void emitPopScope(RegisterID* srcDst); |
| |
| void emitDebugHook(DebugHookID, unsigned line, unsigned charOffset, unsigned lineStart); |
| |
| int scopeDepth() { return m_localScopeDepth + m_finallyDepth; } |
| bool hasFinaliser() { return m_finallyDepth != 0; } |
| |
| void pushFinallyContext(StatementNode* finallyBlock); |
| void popFinallyContext(); |
| |
| void pushIndexedForInScope(RegisterID* local, RegisterID* index); |
| void popIndexedForInScope(RegisterID* local); |
| void pushStructureForInScope(RegisterID* local, RegisterID* index, RegisterID* property, RegisterID* enumerator); |
| void popStructureForInScope(RegisterID* local); |
| void invalidateForInContextForLocal(RegisterID* local); |
| |
| LabelScopePtr breakTarget(const Identifier&); |
| LabelScopePtr continueTarget(const Identifier&); |
| |
| void beginSwitch(RegisterID*, SwitchInfo::SwitchType); |
| void endSwitch(uint32_t clauseCount, RefPtr<Label>*, ExpressionNode**, Label* defaultLabel, int32_t min, int32_t range); |
| |
| CodeType codeType() const { return m_codeType; } |
| |
| bool shouldEmitProfileHooks() { return m_shouldEmitProfileHooks; } |
| bool shouldEmitDebugHooks() { return m_shouldEmitDebugHooks; } |
| |
| bool isStrictMode() const { return m_codeBlock->isStrictMode(); } |
| |
| bool isBuiltinFunction() const { return m_isBuiltinFunction; } |
| |
| OpcodeID lastOpcodeID() const { return m_lastOpcodeID; } |
| |
| private: |
| Variable variableForLocalEntry(const Identifier&, const SymbolTableEntry&); |
| |
| void emitOpcode(OpcodeID); |
| UnlinkedArrayAllocationProfile newArrayAllocationProfile(); |
| UnlinkedObjectAllocationProfile newObjectAllocationProfile(); |
| UnlinkedArrayProfile newArrayProfile(); |
| UnlinkedValueProfile emitProfiledOpcode(OpcodeID); |
| int kill(RegisterID* dst) |
| { |
| int index = dst->index(); |
| m_staticPropertyAnalyzer.kill(index); |
| return index; |
| } |
| |
| void retrieveLastBinaryOp(int& dstIndex, int& src1Index, int& src2Index); |
| void retrieveLastUnaryOp(int& dstIndex, int& srcIndex); |
| ALWAYS_INLINE void rewindBinaryOp(); |
| ALWAYS_INLINE void rewindUnaryOp(); |
| |
| void allocateAndEmitScope(); |
| void emitComplexPopScopes(RegisterID*, ControlFlowContext* topScope, ControlFlowContext* bottomScope); |
| |
| typedef HashMap<double, JSValue> NumberMap; |
| typedef HashMap<StringImpl*, JSString*, IdentifierRepHash> IdentifierStringMap; |
| |
| // Helper for emitCall() and emitConstruct(). This works because the set of |
| // expected functions have identical behavior for both call and construct |
| // (i.e. "Object()" is identical to "new Object()"). |
| ExpectedFunction emitExpectedFunctionSnippet(RegisterID* dst, RegisterID* func, ExpectedFunction, CallArguments&, Label* done); |
| |
| RegisterID* emitCall(OpcodeID, RegisterID* dst, RegisterID* func, ExpectedFunction, CallArguments&, const JSTextPosition& divot, const JSTextPosition& divotStart, const JSTextPosition& divotEnd); |
| |
| RegisterID* newRegister(); |
| |
| // Adds an anonymous local var slot. To give this slot a name, add it to symbolTable(). |
| RegisterID* addVar() |
| { |
| ++m_codeBlock->m_numVars; |
| RegisterID* result = newRegister(); |
| ASSERT(VirtualRegister(result->index()).toLocal() == m_codeBlock->m_numVars - 1); |
| result->ref(); // We should never free this slot. |
| return result; |
| } |
| |
| // Initializes the stack form the parameter; does nothing for the symbol table. |
| RegisterID* initializeNextParameter(); |
| StringImpl* visibleNameForParameter(DeconstructionPatternNode*); |
| |
| RegisterID& registerFor(VirtualRegister reg) |
| { |
| if (reg.isLocal()) |
| return m_calleeRegisters[reg.toLocal()]; |
| |
| if (reg.offset() == JSStack::Callee) |
| return m_calleeRegister; |
| |
| ASSERT(m_parameters.size()); |
| return m_parameters[reg.toArgument()]; |
| } |
| |
| bool hasConstant(const Identifier&) const; |
| unsigned addConstant(const Identifier&); |
| RegisterID* addConstantValue(JSValue, SourceCodeRepresentation = SourceCodeRepresentation::Other); |
| RegisterID* addConstantEmptyValue(); |
| unsigned addRegExp(RegExp*); |
| |
| unsigned addConstantBuffer(unsigned length); |
| |
| UnlinkedFunctionExecutable* makeFunction(FunctionBodyNode* body) |
| { |
| return UnlinkedFunctionExecutable::create(m_vm, m_scopeNode->source(), body, isBuiltinFunction() ? UnlinkedBuiltinFunction : UnlinkedNormalFunction); |
| } |
| |
| RegisterID* emitConstructVarargs(RegisterID* dst, RegisterID* func, RegisterID* thisRegister, RegisterID* arguments, RegisterID* firstFreeRegister, int32_t firstVarArgOffset, RegisterID* profileHookRegister, const JSTextPosition& divot, const JSTextPosition& divotStart, const JSTextPosition& divotEnd); |
| RegisterID* emitCallVarargs(OpcodeID, RegisterID* dst, RegisterID* func, RegisterID* thisRegister, RegisterID* arguments, RegisterID* firstFreeRegister, int32_t firstVarArgOffset, RegisterID* profileHookRegister, const JSTextPosition& divot, const JSTextPosition& divotStart, const JSTextPosition& divotEnd); |
| |
| public: |
| JSString* addStringConstant(const Identifier&); |
| |
| Vector<UnlinkedInstruction, 0, UnsafeVectorOverflow>& instructions() { return m_instructions; } |
| |
| SymbolTable& symbolTable() { return *m_symbolTable; } |
| |
| bool shouldOptimizeLocals() |
| { |
| if (m_codeType != FunctionCode) |
| return false; |
| |
| if (m_localScopeDepth) |
| return false; |
| |
| return true; |
| } |
| |
| bool canOptimizeNonLocals() |
| { |
| if (m_localScopeDepth) |
| return false; |
| |
| if (m_codeType == EvalCode) |
| return false; |
| |
| if (m_codeType == FunctionCode && m_codeBlock->usesEval()) |
| return false; |
| |
| return true; |
| } |
| |
| RegisterID* emitThrowExpressionTooDeepException(); |
| |
| private: |
| Vector<UnlinkedInstruction, 0, UnsafeVectorOverflow> m_instructions; |
| |
| bool m_shouldEmitDebugHooks; |
| bool m_shouldEmitProfileHooks; |
| |
| SymbolTable* m_symbolTable { nullptr }; |
| |
| ScopeNode* const m_scopeNode; |
| Strong<UnlinkedCodeBlock> m_codeBlock; |
| |
| // Some of these objects keep pointers to one another. They are arranged |
| // to ensure a sane destruction order that avoids references to freed memory. |
| HashSet<RefPtr<StringImpl>, IdentifierRepHash> m_functions; |
| RegisterID m_ignoredResultRegister; |
| RegisterID m_thisRegister; |
| RegisterID m_calleeRegister; |
| RegisterID* m_scopeRegister { nullptr }; |
| RegisterID* m_argumentsRegister { nullptr }; |
| RegisterID* m_lexicalEnvironmentRegister { nullptr }; |
| RegisterID* m_emptyValueRegister { nullptr }; |
| RegisterID* m_globalObjectRegister { nullptr }; |
| RegisterID* m_newTargetRegister { nullptr }; |
| |
| SegmentedVector<RegisterID, 32> m_constantPoolRegisters; |
| SegmentedVector<RegisterID, 32> m_calleeRegisters; |
| SegmentedVector<RegisterID, 32> m_parameters; |
| SegmentedVector<Label, 32> m_labels; |
| LabelScopeStore m_labelScopes; |
| int m_finallyDepth { 0 }; |
| int m_localScopeDepth { 0 }; |
| const CodeType m_codeType; |
| |
| Vector<ControlFlowContext, 0, UnsafeVectorOverflow> m_scopeContextStack; |
| Vector<SwitchInfo> m_switchContextStack; |
| Vector<std::unique_ptr<ForInContext>> m_forInContextStack; |
| Vector<TryContext> m_tryContextStack; |
| Vector<std::pair<RefPtr<RegisterID>, const DeconstructionPatternNode*>> m_deconstructedParameters; |
| Vector<FunctionBodyNode*> m_functionsToInitialize; |
| bool m_needToInitializeArguments { false }; |
| |
| Vector<TryRange> m_tryRanges; |
| SegmentedVector<TryData, 8> m_tryData; |
| |
| int m_nextConstantOffset { 0 }; |
| |
| typedef HashMap<FunctionBodyNode*, unsigned> FunctionOffsetMap; |
| FunctionOffsetMap m_functionOffsets; |
| |
| // Constant pool |
| IdentifierMap m_identifierMap; |
| |
| typedef HashMap<EncodedJSValueWithRepresentation, unsigned, EncodedJSValueWithRepresentationHash, EncodedJSValueWithRepresentationHashTraits> JSValueMap; |
| JSValueMap m_jsValueMap; |
| IdentifierStringMap m_stringMap; |
| |
| StaticPropertyAnalyzer m_staticPropertyAnalyzer { &m_instructions }; |
| |
| VM* m_vm; |
| |
| OpcodeID m_lastOpcodeID = op_end; |
| #ifndef NDEBUG |
| size_t m_lastOpcodePosition { 0 }; |
| #endif |
| |
| bool m_usesExceptions { false }; |
| bool m_expressionTooDeep { false }; |
| bool m_isBuiltinFunction { false }; |
| }; |
| |
| } |
| |
| #endif // BytecodeGenerator_h |
