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// Copyright 2012 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_IA32_FRAMES_IA32_H_
#define V8_IA32_FRAMES_IA32_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;
typedef Object* JSCallerSavedBuffer[kNumJSCallerSaved];
// 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 StackHandlerConstants : public AllStatic {
public:
static const int kNextOffset = 0 * kPointerSize;
static const int kCodeOffset = 1 * kPointerSize;
static const int kStateOffset = 2 * kPointerSize;
static const int kContextOffset = 3 * kPointerSize;
static const int kFPOffset = 4 * kPointerSize;
static const int kSize = kFPOffset + kPointerSize;
};
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 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;
};
class StandardFrameConstants : public AllStatic {
public:
// Fixed part of the frame consists of return address, caller fp,
// context and function.
// StandardFrame::IterateExpressions assumes that kContextOffset is the last
// object pointer.
static const int kFixedFrameSize = 4 * kPointerSize;
static const int kExpressionsOffset = -3 * kPointerSize;
static const int kMarkerOffset = -2 * kPointerSize;
static const int kContextOffset = -1 * kPointerSize;
static const int kCallerFPOffset = 0 * kPointerSize;
static const int kCallerPCOffset = +1 * kPointerSize;
static const int kCallerSPOffset = +2 * kPointerSize;
};
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:
static const int kLengthOffset = StandardFrameConstants::kExpressionsOffset;
static const int kFrameSize =
StandardFrameConstants::kFixedFrameSize + kPointerSize;
};
class InternalFrameConstants : public AllStatic {
public:
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_IA32_FRAMES_IA32_H_
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