You can not select more than 25 topics Topics must start with a letter or number, can include dashes ('-') and can be up to 35 characters long.

246 lines
6.9 KiB

// Copyright 2010 the V8 project authors. All rights reserved.
// Redistribution and use in source and binary forms, with or without
// modification, are permitted provided that the following conditions are
// met:
//
// * Redistributions of source code must retain the above copyright
// notice, this list of conditions and the following disclaimer.
// * 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.
// * Neither the name of Google Inc. 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 THE COPYRIGHT HOLDERS AND 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 THE COPYRIGHT
// OWNER OR 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 V8_CODEGEN_H_
#define V8_CODEGEN_H_
#include "code-stubs.h"
#include "runtime.h"
#include "type-info.h"
// Include the declaration of the architecture defined class CodeGenerator.
// The contract to the shared code is that the the CodeGenerator is a subclass
// of Visitor and that the following methods are available publicly:
// MakeCode
// MakeCodePrologue
// MakeCodeEpilogue
// masm
// frame
// script
// has_valid_frame
// SetFrame
// DeleteFrame
// allocator
// AddDeferred
// in_spilled_code
// set_in_spilled_code
// RecordPositions
//
// These methods are either used privately by the shared code or implemented as
// shared code:
// CodeGenerator
// ~CodeGenerator
// ProcessDeferred
// Generate
// ComputeLazyCompile
// BuildFunctionInfo
// ProcessDeclarations
// DeclareGlobals
// CheckForInlineRuntimeCall
// AnalyzeCondition
// CodeForFunctionPosition
// CodeForReturnPosition
// CodeForStatementPosition
// CodeForDoWhileConditionPosition
// CodeForSourcePosition
enum InitState { CONST_INIT, NOT_CONST_INIT };
enum TypeofState { INSIDE_TYPEOF, NOT_INSIDE_TYPEOF };
#if V8_TARGET_ARCH_IA32
#include "ia32/codegen-ia32.h"
#elif V8_TARGET_ARCH_X64
#include "x64/codegen-x64.h"
#elif V8_TARGET_ARCH_ARM
#include "arm/codegen-arm.h"
#elif V8_TARGET_ARCH_MIPS
#include "mips/codegen-mips.h"
#else
#error Unsupported target architecture.
#endif
#include "register-allocator.h"
namespace v8 {
namespace internal {
// Code generation can be nested. Code generation scopes form a stack
// of active code generators.
class CodeGeneratorScope BASE_EMBEDDED {
public:
explicit CodeGeneratorScope(CodeGenerator* cgen) {
previous_ = top_;
top_ = cgen;
}
~CodeGeneratorScope() {
top_ = previous_;
}
static CodeGenerator* Current() {
ASSERT(top_ != NULL);
return top_;
}
private:
static CodeGenerator* top_;
CodeGenerator* previous_;
};
#if V8_TARGET_ARCH_IA32 || V8_TARGET_ARCH_X64
// State of used registers in a virtual frame.
class FrameRegisterState {
public:
// Captures the current state of the given frame.
explicit FrameRegisterState(VirtualFrame* frame);
// Saves the state in the stack.
void Save(MacroAssembler* masm) const;
// Restores the state from the stack.
void Restore(MacroAssembler* masm) const;
private:
// Constants indicating special actions. They should not be multiples
// of kPointerSize so they will not collide with valid offsets from
// the frame pointer.
static const int kIgnore = -1;
static const int kPush = 1;
// This flag is ored with a valid offset from the frame pointer, so
// it should fit in the low zero bits of a valid offset.
static const int kSyncedFlag = 2;
int registers_[RegisterAllocator::kNumRegisters];
};
#elif V8_TARGET_ARCH_ARM || V8_TARGET_ARCH_MIPS
class FrameRegisterState {
public:
inline FrameRegisterState(VirtualFrame frame) : frame_(frame) { }
inline const VirtualFrame* frame() const { return &frame_; }
private:
VirtualFrame frame_;
};
#else
#error Unsupported target architecture.
#endif
// RuntimeCallHelper implementation that saves/restores state of a
// virtual frame.
class VirtualFrameRuntimeCallHelper : public RuntimeCallHelper {
public:
// Does not take ownership of |frame_state|.
explicit VirtualFrameRuntimeCallHelper(const FrameRegisterState* frame_state)
: frame_state_(frame_state) {}
virtual void BeforeCall(MacroAssembler* masm) const;
virtual void AfterCall(MacroAssembler* masm) const;
private:
const FrameRegisterState* frame_state_;
};
// Deferred code objects are small pieces of code that are compiled
// out of line. They are used to defer the compilation of uncommon
// paths thereby avoiding expensive jumps around uncommon code parts.
class DeferredCode: public ZoneObject {
public:
DeferredCode();
virtual ~DeferredCode() { }
virtual void Generate() = 0;
MacroAssembler* masm() { return masm_; }
int statement_position() const { return statement_position_; }
int position() const { return position_; }
Label* entry_label() { return &entry_label_; }
Label* exit_label() { return &exit_label_; }
#ifdef DEBUG
void set_comment(const char* comment) { comment_ = comment; }
const char* comment() const { return comment_; }
#else
void set_comment(const char* comment) { }
const char* comment() const { return ""; }
#endif
inline void Jump();
inline void Branch(Condition cc);
void BindExit() { masm_->bind(&exit_label_); }
const FrameRegisterState* frame_state() const { return &frame_state_; }
void SaveRegisters();
void RestoreRegisters();
void Exit();
// If this returns true then all registers will be saved for the duration
// of the Generate() call. Otherwise the registers are not saved and the
// Generate() call must bracket runtime any runtime calls with calls to
// SaveRegisters() and RestoreRegisters(). In this case the Generate
// method must also call Exit() in order to return to the non-deferred
// code.
virtual bool AutoSaveAndRestore() { return true; }
protected:
MacroAssembler* masm_;
private:
int statement_position_;
int position_;
Label entry_label_;
Label exit_label_;
FrameRegisterState frame_state_;
#ifdef DEBUG
const char* comment_;
#endif
DISALLOW_COPY_AND_ASSIGN(DeferredCode);
};
} } // namespace v8::internal
#endif // V8_CODEGEN_H_