2010-02-04 20:36:58 +00:00
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// Copyright 2010 the V8 project authors. All rights reserved.
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// Redistribution and use in source and binary forms, with or without
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// modification, are permitted provided that the following conditions are
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// met:
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//
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// * Redistributions of source code must retain the above copyright
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// notice, this list of conditions and the following disclaimer.
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// * Redistributions in binary form must reproduce the above
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// copyright notice, this list of conditions and the following
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// disclaimer in the documentation and/or other materials provided
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// with the distribution.
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// * Neither the name of Google Inc. nor the names of its
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// contributors may be used to endorse or promote products derived
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// from this software without specific prior written permission.
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//
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// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
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// "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
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// LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
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// A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
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// OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
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// SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
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// LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
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// DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
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// THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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// (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
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// OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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#ifndef V8_MIPS_CODEGEN_MIPS_H_
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#define V8_MIPS_CODEGEN_MIPS_H_
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namespace v8 {
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namespace internal {
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// Forward declarations
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class CompilationInfo;
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class DeferredCode;
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class RegisterAllocator;
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class RegisterFile;
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enum InitState { CONST_INIT, NOT_CONST_INIT };
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enum TypeofState { INSIDE_TYPEOF, NOT_INSIDE_TYPEOF };
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2010-03-23 15:04:45 +00:00
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// -----------------------------------------------------------------------------
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// Reference support
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// A reference is a C++ stack-allocated object that keeps an ECMA
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// reference on the execution stack while in scope. For variables
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// the reference is empty, indicating that it isn't necessary to
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// store state on the stack for keeping track of references to those.
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// For properties, we keep either one (named) or two (indexed) values
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// on the execution stack to represent the reference.
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class Reference BASE_EMBEDDED {
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public:
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// The values of the types is important, see size().
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enum Type { UNLOADED = -2, ILLEGAL = -1, SLOT = 0, NAMED = 1, KEYED = 2 };
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Reference(CodeGenerator* cgen,
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Expression* expression,
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bool persist_after_get = false);
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~Reference();
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Expression* expression() const { return expression_; }
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Type type() const { return type_; }
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void set_type(Type value) {
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ASSERT_EQ(ILLEGAL, type_);
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type_ = value;
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}
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void set_unloaded() {
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ASSERT_NE(ILLEGAL, type_);
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ASSERT_NE(UNLOADED, type_);
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type_ = UNLOADED;
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}
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// The size the reference takes up on the stack.
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int size() const {
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return (type_ < SLOT) ? 0 : type_;
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}
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bool is_illegal() const { return type_ == ILLEGAL; }
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bool is_slot() const { return type_ == SLOT; }
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bool is_property() const { return type_ == NAMED || type_ == KEYED; }
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bool is_unloaded() const { return type_ == UNLOADED; }
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// Return the name. Only valid for named property references.
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Handle<String> GetName();
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// Generate code to push the value of the reference on top of the
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// expression stack. The reference is expected to be already on top of
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// the expression stack, and it is consumed by the call unless the
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// reference is for a compound assignment.
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// If the reference is not consumed, it is left in place under its value.
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void GetValue();
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// Generate code to pop a reference, push the value of the reference,
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// and then spill the stack frame.
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inline void GetValueAndSpill();
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// Generate code to store the value on top of the expression stack in the
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// reference. The reference is expected to be immediately below the value
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// on the expression stack. The value is stored in the location specified
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// by the reference, and is left on top of the stack, after the reference
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// is popped from beneath it (unloaded).
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void SetValue(InitState init_state);
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private:
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CodeGenerator* cgen_;
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Expression* expression_;
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Type type_;
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// Keep the reference on the stack after get, so it can be used by set later.
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bool persist_after_get_;
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};
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// -----------------------------------------------------------------------------
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2010-02-04 20:36:58 +00:00
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// Code generation state
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// The state is passed down the AST by the code generator (and back up, in
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// the form of the state of the label pair). It is threaded through the
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// call stack. Constructing a state implicitly pushes it on the owning code
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// generator's stack of states, and destroying one implicitly pops it.
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class CodeGenState BASE_EMBEDDED {
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public:
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// Create an initial code generator state. Destroying the initial state
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// leaves the code generator with a NULL state.
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explicit CodeGenState(CodeGenerator* owner);
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// Create a code generator state based on a code generator's current
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// state. The new state has its own typeof state and pair of branch
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// labels.
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CodeGenState(CodeGenerator* owner,
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JumpTarget* true_target,
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JumpTarget* false_target);
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// Destroy a code generator state and restore the owning code generator's
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// previous state.
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~CodeGenState();
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TypeofState typeof_state() const { return typeof_state_; }
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JumpTarget* true_target() const { return true_target_; }
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JumpTarget* false_target() const { return false_target_; }
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private:
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// The owning code generator.
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CodeGenerator* owner_;
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// A flag indicating whether we are compiling the immediate subexpression
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// of a typeof expression.
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TypeofState typeof_state_;
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JumpTarget* true_target_;
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JumpTarget* false_target_;
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// The previous state of the owning code generator, restored when
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// this state is destroyed.
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CodeGenState* previous_;
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};
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2010-03-23 15:04:45 +00:00
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// -----------------------------------------------------------------------------
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2010-02-04 20:36:58 +00:00
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// CodeGenerator
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class CodeGenerator: public AstVisitor {
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public:
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// Compilation mode. Either the compiler is used as the primary
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// compiler and needs to setup everything or the compiler is used as
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// the secondary compiler for split compilation and has to handle
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// bailouts.
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enum Mode {
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PRIMARY,
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SECONDARY
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};
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// Takes a function literal, generates code for it. This function should only
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// be called by compiler.cc.
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static Handle<Code> MakeCode(CompilationInfo* info);
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// Printing of AST, etc. as requested by flags.
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static void MakeCodePrologue(CompilationInfo* info);
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// Allocate and install the code.
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static Handle<Code> MakeCodeEpilogue(MacroAssembler* masm,
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Code::Flags flags,
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CompilationInfo* info);
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#ifdef ENABLE_LOGGING_AND_PROFILING
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static bool ShouldGenerateLog(Expression* type);
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#endif
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static void SetFunctionInfo(Handle<JSFunction> fun,
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FunctionLiteral* lit,
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bool is_toplevel,
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Handle<Script> script);
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static void RecordPositions(MacroAssembler* masm, int pos);
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// Accessors
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MacroAssembler* masm() { return masm_; }
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VirtualFrame* frame() const { return frame_; }
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inline Handle<Script> script();
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bool has_valid_frame() const { return frame_ != NULL; }
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// Set the virtual frame to be new_frame, with non-frame register
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// reference counts given by non_frame_registers. The non-frame
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// register reference counts of the old frame are returned in
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// non_frame_registers.
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void SetFrame(VirtualFrame* new_frame, RegisterFile* non_frame_registers);
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void DeleteFrame();
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RegisterAllocator* allocator() const { return allocator_; }
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CodeGenState* state() { return state_; }
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void set_state(CodeGenState* state) { state_ = state; }
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void AddDeferred(DeferredCode* code) { deferred_.Add(code); }
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static const int kUnknownIntValue = -1;
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// Number of instructions used for the JS return sequence. The constant is
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// used by the debugger to patch the JS return sequence.
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2010-03-23 15:04:45 +00:00
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static const int kJSReturnSequenceLength = 7;
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2010-02-04 20:36:58 +00:00
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2010-03-11 10:56:49 +00:00
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// If the name is an inline runtime function call return the number of
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// expected arguments. Otherwise return -1.
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static int InlineRuntimeCallArgumentsCount(Handle<String> name);
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2010-02-04 20:36:58 +00:00
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private:
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// Construction/Destruction.
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explicit CodeGenerator(MacroAssembler* masm);
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// Accessors.
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inline bool is_eval();
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2010-03-01 08:32:54 +00:00
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inline Scope* scope();
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2010-02-04 20:36:58 +00:00
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// Generating deferred code.
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void ProcessDeferred();
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// State
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2010-09-24 08:25:31 +00:00
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bool has_cc() const { return cc_reg_ != cc_always; }
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2010-02-04 20:36:58 +00:00
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TypeofState typeof_state() const { return state_->typeof_state(); }
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2010-09-24 08:25:31 +00:00
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JumpTarget* true_target() const { return state_->true_target(); }
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JumpTarget* false_target() const { return state_->false_target(); }
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2010-02-04 20:36:58 +00:00
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// We don't track loop nesting level on mips yet.
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int loop_nesting() const { return 0; }
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// Node visitors.
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void VisitStatements(ZoneList<Statement*>* statements);
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#define DEF_VISIT(type) \
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void Visit##type(type* node);
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AST_NODE_LIST(DEF_VISIT)
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#undef DEF_VISIT
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2010-03-23 15:04:45 +00:00
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// Visit a statement and then spill the virtual frame if control flow can
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// reach the end of the statement (ie, it does not exit via break,
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// continue, return, or throw). This function is used temporarily while
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// the code generator is being transformed.
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inline void VisitAndSpill(Statement* statement);
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// Visit a list of statements and then spill the virtual frame if control
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// flow can reach the end of the list.
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inline void VisitStatementsAndSpill(ZoneList<Statement*>* statements);
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2010-02-04 20:36:58 +00:00
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// Main code generation function
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2010-03-01 08:32:54 +00:00
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void Generate(CompilationInfo* info);
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2010-02-04 20:36:58 +00:00
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2010-03-23 15:04:45 +00:00
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// The following are used by class Reference.
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void LoadReference(Reference* ref);
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void UnloadReference(Reference* ref);
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MemOperand ContextOperand(Register context, int index) const {
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return MemOperand(context, Context::SlotOffset(index));
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}
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MemOperand SlotOperand(Slot* slot, Register tmp);
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// Expressions
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2010-09-24 08:25:31 +00:00
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MemOperand GlobalObject() const {
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2010-03-23 15:04:45 +00:00
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return ContextOperand(cp, Context::GLOBAL_INDEX);
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}
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void LoadCondition(Expression* x,
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JumpTarget* true_target,
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JumpTarget* false_target,
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bool force_cc);
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void Load(Expression* x);
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void LoadGlobal();
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// Generate code to push the value of an expression on top of the frame
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// and then spill the frame fully to memory. This function is used
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// temporarily while the code generator is being transformed.
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inline void LoadAndSpill(Expression* expression);
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// Read a value from a slot and leave it on top of the expression stack.
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void LoadFromSlot(Slot* slot, TypeofState typeof_state);
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// Store the value on top of the stack to a slot.
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void StoreToSlot(Slot* slot, InitState init_state);
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2010-02-04 20:36:58 +00:00
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struct InlineRuntimeLUT {
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void (CodeGenerator::*method)(ZoneList<Expression*>*);
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const char* name;
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2010-03-11 10:56:49 +00:00
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int nargs;
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2010-02-04 20:36:58 +00:00
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};
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static InlineRuntimeLUT* FindInlineRuntimeLUT(Handle<String> name);
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bool CheckForInlineRuntimeCall(CallRuntime* node);
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static Handle<Code> ComputeLazyCompile(int argc);
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void ProcessDeclarations(ZoneList<Declaration*>* declarations);
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Handle<Code> ComputeCallInitialize(int argc, InLoopFlag in_loop);
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// Declare global variables and functions in the given array of
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// name/value pairs.
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void DeclareGlobals(Handle<FixedArray> pairs);
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// Support for type checks.
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void GenerateIsSmi(ZoneList<Expression*>* args);
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void GenerateIsNonNegativeSmi(ZoneList<Expression*>* args);
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void GenerateIsArray(ZoneList<Expression*>* args);
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2010-02-19 13:07:37 +00:00
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void GenerateIsRegExp(ZoneList<Expression*>* args);
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2010-02-04 20:36:58 +00:00
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// Support for construct call checks.
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void GenerateIsConstructCall(ZoneList<Expression*>* args);
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// Support for arguments.length and arguments[?].
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void GenerateArgumentsLength(ZoneList<Expression*>* args);
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2010-03-11 10:56:49 +00:00
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void GenerateArguments(ZoneList<Expression*>* args);
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2010-02-04 20:36:58 +00:00
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// Support for accessing the class and value fields of an object.
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void GenerateClassOf(ZoneList<Expression*>* args);
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void GenerateValueOf(ZoneList<Expression*>* args);
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void GenerateSetValueOf(ZoneList<Expression*>* args);
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// Fast support for charCodeAt(n).
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void GenerateFastCharCodeAt(ZoneList<Expression*>* args);
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2010-02-26 20:14:20 +00:00
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// Fast support for string.charAt(n) and string[n].
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void GenerateCharFromCode(ZoneList<Expression*>* args);
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2010-02-04 20:36:58 +00:00
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// Fast support for object equality testing.
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void GenerateObjectEquals(ZoneList<Expression*>* args);
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void GenerateLog(ZoneList<Expression*>* args);
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// Fast support for Math.random().
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2010-04-07 08:18:51 +00:00
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void GenerateRandomHeapNumber(ZoneList<Expression*>* args);
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2010-02-04 20:36:58 +00:00
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void GenerateIsObject(ZoneList<Expression*>* args);
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2010-07-16 11:21:08 +00:00
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void GenerateIsSpecObject(ZoneList<Expression*>* args);
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2010-02-04 20:36:58 +00:00
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void GenerateIsFunction(ZoneList<Expression*>* args);
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void GenerateIsUndetectableObject(ZoneList<Expression*>* args);
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void GenerateStringAdd(ZoneList<Expression*>* args);
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void GenerateSubString(ZoneList<Expression*>* args);
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void GenerateStringCompare(ZoneList<Expression*>* args);
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void GenerateRegExpExec(ZoneList<Expression*>* args);
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2010-02-19 13:07:37 +00:00
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void GenerateNumberToString(ZoneList<Expression*>* args);
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2010-03-11 10:56:49 +00:00
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// Fast call to math functions.
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2010-03-08 13:49:23 +00:00
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void GenerateMathPow(ZoneList<Expression*>* args);
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2010-03-11 10:56:49 +00:00
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void GenerateMathSin(ZoneList<Expression*>* args);
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void GenerateMathCos(ZoneList<Expression*>* args);
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void GenerateMathSqrt(ZoneList<Expression*>* args);
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2010-02-04 20:36:58 +00:00
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// Simple condition analysis.
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enum ConditionAnalysis {
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ALWAYS_TRUE,
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ALWAYS_FALSE,
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DONT_KNOW
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};
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ConditionAnalysis AnalyzeCondition(Expression* cond);
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// Methods used to indicate which source code is generated for. Source
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// positions are collected by the assembler and emitted with the relocation
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// information.
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void CodeForFunctionPosition(FunctionLiteral* fun);
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void CodeForReturnPosition(FunctionLiteral* fun);
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void CodeForStatementPosition(Statement* node);
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void CodeForDoWhileConditionPosition(DoWhileStatement* stmt);
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void CodeForSourcePosition(int pos);
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#ifdef DEBUG
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// True if the registers are valid for entry to a block.
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bool HasValidEntryRegisters();
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#endif
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bool is_eval_; // Tells whether code is generated for eval.
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Handle<Script> script_;
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List<DeferredCode*> deferred_;
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// Assembler
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MacroAssembler* masm_; // to generate code
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CompilationInfo* info_;
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|
// Code generation state
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VirtualFrame* frame_;
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|
RegisterAllocator* allocator_;
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Condition cc_reg_;
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|
CodeGenState* state_;
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|
// Jump targets
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BreakTarget function_return_;
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|
// True if the function return is shadowed (ie, jumping to the target
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|
|
|
// function_return_ does not jump to the true function return, but rather
|
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|
// to some unlinking code).
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|
|
bool function_return_is_shadowed_;
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|
static InlineRuntimeLUT kInlineRuntimeLUT[];
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|
friend class VirtualFrame;
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|
friend class JumpTarget;
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|
friend class Reference;
|
|
|
|
friend class FastCodeGenerator;
|
2010-03-01 08:32:54 +00:00
|
|
|
friend class FullCodeGenerator;
|
2010-02-04 20:36:58 +00:00
|
|
|
friend class FullCodeGenSyntaxChecker;
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|
|
DISALLOW_COPY_AND_ASSIGN(CodeGenerator);
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|
|
};
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} } // namespace v8::internal
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#endif // V8_MIPS_CODEGEN_MIPS_H_
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