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// Copyright 2012 the V8 project authors. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
#ifndef V8_X87_FRAMES_X87_H_
#define V8_X87_FRAMES_X87_H_
namespace v8 {
namespace internal {
// Register lists
// Note that the bit values must match those used in actual instruction encoding
const int kNumRegs = 8;
// Caller-saved registers
const RegList kJSCallerSaved =
1 << 0 | // eax
1 << 1 | // ecx
1 << 2 | // edx
1 << 3 | // ebx - used as a caller-saved register in JavaScript code
1 << 7; // edi - callee function
const int kNumJSCallerSaved = 5;
// Number of registers for which space is reserved in safepoints.
const int kNumSafepointRegisters = 8;
const int kNoAlignmentPadding = 0;
const int kAlignmentPaddingPushed = 2;
const int kAlignmentZapValue = 0x12345678; // Not heap object tagged.
// ----------------------------------------------------
class EntryFrameConstants : public AllStatic {
public:
static const int kCallerFPOffset = -6 * kPointerSize;
static const int kFunctionArgOffset = +3 * kPointerSize;
static const int kReceiverArgOffset = +4 * kPointerSize;
static const int kArgcOffset = +5 * kPointerSize;
static const int kArgvOffset = +6 * kPointerSize;
};
class ExitFrameConstants : public AllStatic {
public:
static const int kFrameSize = 2 * kPointerSize;
static const int kCodeOffset = -2 * kPointerSize;
static const int kSPOffset = -1 * kPointerSize;
static const int kCallerFPOffset = 0 * kPointerSize;
static const int kCallerPCOffset = +1 * kPointerSize;
// FP-relative displacement of the caller's SP. It points just
// below the saved PC.
static const int kCallerSPDisplacement = +2 * kPointerSize;
static const int kConstantPoolOffset = 0; // Not used
};
class JavaScriptFrameConstants : public AllStatic {
public:
// FP-relative.
static const int kLocal0Offset = StandardFrameConstants::kExpressionsOffset;
static const int kLastParameterOffset = +2 * kPointerSize;
static const int kFunctionOffset = StandardFrameConstants::kMarkerOffset;
// Caller SP-relative.
static const int kParam0Offset = -2 * kPointerSize;
static const int kReceiverOffset = -1 * kPointerSize;
static const int kDynamicAlignmentStateOffset = kLocal0Offset;
};
class ArgumentsAdaptorFrameConstants : public AllStatic {
public:
// FP-relative.
static const int kLengthOffset = StandardFrameConstants::kExpressionsOffset;
static const int kFrameSize =
StandardFrameConstants::kFixedFrameSize + kPointerSize;
};
class ConstructFrameConstants : public AllStatic {
public:
// FP-relative.
static const int kImplicitReceiverOffset = -5 * kPointerSize;
static const int kConstructorOffset = kMinInt;
static const int kLengthOffset = -4 * kPointerSize;
static const int kCodeOffset = StandardFrameConstants::kExpressionsOffset;
static const int kFrameSize =
StandardFrameConstants::kFixedFrameSize + 3 * kPointerSize;
};
class InternalFrameConstants : public AllStatic {
public:
// FP-relative.
static const int kCodeOffset = StandardFrameConstants::kExpressionsOffset;
};
inline Object* JavaScriptFrame::function_slot_object() const {
const int offset = JavaScriptFrameConstants::kFunctionOffset;
return Memory::Object_at(fp() + offset);
}
} } // namespace v8::internal
#endif // V8_X87_FRAMES_X87_H_