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v8/src/frame-constants.h
Georgia Kouveli 57ea01af61 Add padding to builtin exit frames. 
This is part of JSSP removal for arm64. The padding is needed so
that the extra arguments, which are pushed separately from the rest
of the arguments, will take up an even number of slots, to avoid
copying the rest of the arguments one slot down.

Bug: v8:6644
Change-Id: I00a8730c375e4b4cc8fa0c8b6372751f92754466
Reviewed-on: https://chromium-review.googlesource.com/713255
Commit-Queue: Georgia Kouveli <georgia.kouveli@arm.com>
Reviewed-by: Benedikt Meurer <bmeurer@chromium.org>
Reviewed-by: Jakob Gruber <jgruber@chromium.org>
Cr-Commit-Position: refs/heads/master@{#48547}
2017-10-13 13:52:18 +00:00

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// Copyright 2017 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_FRAME_CONSTANTS_H_
#define V8_FRAME_CONSTANTS_H_
#include "src/flags.h"
#include "src/globals.h"
namespace v8 {
namespace internal {
// Every pointer in a frame has a slot id. On 32-bit platforms, doubles consume
// two slots.
//
// Stack slot indices >= 0 access the callee stack with slot 0 corresponding to
// the callee's saved return address and 1 corresponding to the saved frame
// pointer. Some frames have additional information stored in the fixed header,
// for example JSFunctions store the function context and marker in the fixed
// header, with slot index 2 corresponding to the current function context and 3
// corresponding to the frame marker/JSFunction.
//
// slot JS frame
// +-----------------+--------------------------------
// -n-1 | parameter 0 | ^
// |- - - - - - - - -| |
// -n | | Caller
// ... | ... | frame slots
// -2 | parameter n-1 | (slot < 0)
// |- - - - - - - - -| |
// -1 | parameter n | v
// -----+-----------------+--------------------------------
// 0 | return addr | ^ ^
// |- - - - - - - - -| | |
// 1 | saved frame ptr | Fixed |
// |- - - - - - - - -| Header <-- frame ptr |
// 2 | [Constant Pool] | | |
// |- - - - - - - - -| | |
// 2+cp |Context/Frm. Type| v if a constant pool |
// |-----------------+---- is used, cp = 1, |
// 3+cp | | ^ otherwise, cp = 0 |
// |- - - - - - - - -| | |
// 4+cp | | | Callee
// |- - - - - - - - -| | frame slots
// ... | | Frame slots (slot >= 0)
// |- - - - - - - - -| | |
// | | v |
// -----+-----------------+----- <-- stack ptr -------------
//
class CommonFrameConstants : public AllStatic {
public:
static const int kCallerFPOffset = 0 * kPointerSize;
static const int kCallerPCOffset = kCallerFPOffset + 1 * kFPOnStackSize;
static const int kCallerSPOffset = kCallerPCOffset + 1 * kPCOnStackSize;
// Fixed part of the frame consists of return address, caller fp,
// constant pool (if FLAG_enable_embedded_constant_pool), context, and
// function. StandardFrame::IterateExpressions assumes that kLastObjectOffset
// is the last object pointer.
static const int kFixedFrameSizeAboveFp = kPCOnStackSize + kFPOnStackSize;
static const int kFixedSlotCountAboveFp =
kFixedFrameSizeAboveFp / kPointerSize;
static const int kCPSlotSize =
FLAG_enable_embedded_constant_pool ? kPointerSize : 0;
static const int kCPSlotCount = kCPSlotSize / kPointerSize;
static const int kConstantPoolOffset = kCPSlotSize ? -1 * kPointerSize : 0;
static const int kContextOrFrameTypeSize = kPointerSize;
static const int kContextOrFrameTypeOffset =
-(kCPSlotSize + kContextOrFrameTypeSize);
};
// StandardFrames are used for interpreted, full-codegen and optimized
// JavaScript frames. They always have a context below the saved fp/constant
// pool and below that the JSFunction of the executing function.
//
// slot JS frame
// +-----------------+--------------------------------
// -n-1 | parameter 0 | ^
// |- - - - - - - - -| |
// -n | | Caller
// ... | ... | frame slots
// -2 | parameter n-1 | (slot < 0)
// |- - - - - - - - -| |
// -1 | parameter n | v
// -----+-----------------+--------------------------------
// 0 | return addr | ^ ^
// |- - - - - - - - -| | |
// 1 | saved frame ptr | Fixed |
// |- - - - - - - - -| Header <-- frame ptr |
// 2 | [Constant Pool] | | |
// |- - - - - - - - -| | |
// 2+cp | Context | | if a constant pool |
// |- - - - - - - - -| | is used, cp = 1, |
// 3+cp | JSFunction | v otherwise, cp = 0 |
// +-----------------+---- |
// 4+cp | | ^ Callee
// |- - - - - - - - -| | frame slots
// ... | | Frame slots (slot >= 0)
// |- - - - - - - - -| | |
// | | v |
// -----+-----------------+----- <-- stack ptr -------------
//
class StandardFrameConstants : public CommonFrameConstants {
public:
static const int kFixedFrameSizeFromFp = 2 * kPointerSize + kCPSlotSize;
static const int kFixedFrameSize =
kFixedFrameSizeAboveFp + kFixedFrameSizeFromFp;
static const int kFixedSlotCountFromFp = kFixedFrameSizeFromFp / kPointerSize;
static const int kFixedSlotCount = kFixedFrameSize / kPointerSize;
static const int kContextOffset = kContextOrFrameTypeOffset;
static const int kFunctionOffset = -2 * kPointerSize - kCPSlotSize;
static const int kExpressionsOffset = -3 * kPointerSize - kCPSlotSize;
static const int kLastObjectOffset = kContextOffset;
};
// OptimizedBuiltinFrameConstants are used for TF-generated builtins. They
// always have a context below the saved fp/constant pool and below that the
// JSFunction of the executing function and below that an integer (not a Smi)
// containing the number of arguments passed to the builtin.
//
// slot JS frame
// +-----------------+--------------------------------
// -n-1 | parameter 0 | ^
// |- - - - - - - - -| |
// -n | | Caller
// ... | ... | frame slots
// -2 | parameter n-1 | (slot < 0)
// |- - - - - - - - -| |
// -1 | parameter n | v
// -----+-----------------+--------------------------------
// 0 | return addr | ^ ^
// |- - - - - - - - -| | |
// 1 | saved frame ptr | Fixed |
// |- - - - - - - - -| Header <-- frame ptr |
// 2 | [Constant Pool] | | |
// |- - - - - - - - -| | |
// 2+cp | Context | | if a constant pool |
// |- - - - - - - - -| | is used, cp = 1, |
// 3+cp | JSFunction | | otherwise, cp = 0 |
// |- - - - - - - - -| | |
// 4+cp | argc | v |
// +-----------------+---- |
// 5+cp | | ^ Callee
// |- - - - - - - - -| | frame slots
// ... | | Frame slots (slot >= 0)
// |- - - - - - - - -| | |
// | | v |
// -----+-----------------+----- <-- stack ptr -------------
//
class OptimizedBuiltinFrameConstants : public StandardFrameConstants {
public:
static const int kArgCSize = kPointerSize;
static const int kArgCOffset = -3 * kPointerSize - kCPSlotSize;
static const int kFixedFrameSize = kFixedFrameSizeAboveFp - kArgCOffset;
static const int kFixedSlotCount = kFixedFrameSize / kPointerSize;
};
// TypedFrames have a SMI type maker value below the saved FP/constant pool to
// distinguish them from StandardFrames, which have a context in that position
// instead.
//
// slot JS frame
// +-----------------+--------------------------------
// -n-1 | parameter 0 | ^
// |- - - - - - - - -| |
// -n | | Caller
// ... | ... | frame slots
// -2 | parameter n-1 | (slot < 0)
// |- - - - - - - - -| |
// -1 | parameter n | v
// -----+-----------------+--------------------------------
// 0 | return addr | ^ ^
// |- - - - - - - - -| | |
// 1 | saved frame ptr | Fixed |
// |- - - - - - - - -| Header <-- frame ptr |
// 2 | [Constant Pool] | | |
// |- - - - - - - - -| | |
// 2+cp |Frame Type Marker| v if a constant pool |
// |-----------------+---- is used, cp = 1, |
// 3+cp | | ^ otherwise, cp = 0 |
// |- - - - - - - - -| | |
// 4+cp | | | Callee
// |- - - - - - - - -| | frame slots
// ... | | Frame slots (slot >= 0)
// |- - - - - - - - -| | |
// | | v |
// -----+-----------------+----- <-- stack ptr -------------
//
class TypedFrameConstants : public CommonFrameConstants {
public:
static const int kFrameTypeSize = kContextOrFrameTypeSize;
static const int kFrameTypeOffset = kContextOrFrameTypeOffset;
static const int kFixedFrameSizeFromFp = kCPSlotSize + kFrameTypeSize;
static const int kFixedSlotCountFromFp = kFixedFrameSizeFromFp / kPointerSize;
static const int kFixedFrameSize =
StandardFrameConstants::kFixedFrameSizeAboveFp + kFixedFrameSizeFromFp;
static const int kFixedSlotCount = kFixedFrameSize / kPointerSize;
static const int kFirstPushedFrameValueOffset =
-StandardFrameConstants::kCPSlotSize - kFrameTypeSize - kPointerSize;
};
#define TYPED_FRAME_PUSHED_VALUE_OFFSET(x) \
(TypedFrameConstants::kFirstPushedFrameValueOffset - (x)*kPointerSize)
#define TYPED_FRAME_SIZE(count) \
(TypedFrameConstants::kFixedFrameSize + (count)*kPointerSize)
#define TYPED_FRAME_SIZE_FROM_SP(count) \
(TypedFrameConstants::kFixedFrameSizeFromFp + (count)*kPointerSize)
#define DEFINE_TYPED_FRAME_SIZES(count) \
static const int kFixedFrameSize = TYPED_FRAME_SIZE(count); \
static const int kFixedSlotCount = kFixedFrameSize / kPointerSize; \
static const int kFixedFrameSizeFromFp = TYPED_FRAME_SIZE_FROM_SP(count); \
static const int kFixedSlotCountFromFp = kFixedFrameSizeFromFp / kPointerSize
class ArgumentsAdaptorFrameConstants : public TypedFrameConstants {
public:
// FP-relative.
static const int kFunctionOffset = TYPED_FRAME_PUSHED_VALUE_OFFSET(0);
static const int kLengthOffset = TYPED_FRAME_PUSHED_VALUE_OFFSET(1);
DEFINE_TYPED_FRAME_SIZES(2);
};
class BuiltinFrameConstants : public TypedFrameConstants {
public:
// FP-relative.
static const int kFunctionOffset = TYPED_FRAME_PUSHED_VALUE_OFFSET(0);
static const int kLengthOffset = TYPED_FRAME_PUSHED_VALUE_OFFSET(1);
DEFINE_TYPED_FRAME_SIZES(2);
};
class InternalFrameConstants : public TypedFrameConstants {
public:
// FP-relative.
static const int kCodeOffset = TYPED_FRAME_PUSHED_VALUE_OFFSET(0);
DEFINE_TYPED_FRAME_SIZES(1);
};
class ConstructFrameConstants : public TypedFrameConstants {
public:
// FP-relative.
static const int kContextOffset = TYPED_FRAME_PUSHED_VALUE_OFFSET(0);
static const int kLengthOffset = TYPED_FRAME_PUSHED_VALUE_OFFSET(1);
static const int kConstructorOffset = TYPED_FRAME_PUSHED_VALUE_OFFSET(2);
static const int kNewTargetOrImplicitReceiverOffset =
TYPED_FRAME_PUSHED_VALUE_OFFSET(3);
DEFINE_TYPED_FRAME_SIZES(4);
};
class BuiltinContinuationFrameConstants : public TypedFrameConstants {
public:
// FP-relative.
static const int kFunctionOffset = TYPED_FRAME_PUSHED_VALUE_OFFSET(0);
static const int kBuiltinOffset = TYPED_FRAME_PUSHED_VALUE_OFFSET(1);
// The argument count is in the first allocatable register, stored below the
// fixed part of the frame and therefore is not part of the fixed frame size.
static const int kArgCOffset = TYPED_FRAME_PUSHED_VALUE_OFFSET(2);
DEFINE_TYPED_FRAME_SIZES(2);
// Returns the number of padding stack slots needed when we have
// 'register_count' register slots.
// This is needed on some architectures to ensure the stack pointer is
// aligned.
static int PaddingSlotCount(int register_count);
};
// Behaves like an exit frame but with target and new target args.
class BuiltinExitFrameConstants : public CommonFrameConstants {
public:
static const int kNewTargetOffset = kCallerPCOffset + 1 * kPointerSize;
static const int kTargetOffset = kNewTargetOffset + 1 * kPointerSize;
static const int kArgcOffset = kTargetOffset + 1 * kPointerSize;
static const int kPaddingOffset = kArgcOffset + 1 * kPointerSize;
static const int kFirstArgumentOffset = kPaddingOffset + 1 * kPointerSize;
static const int kNumExtraArgsWithReceiver = 5;
};
class InterpreterFrameConstants : public AllStatic {
public:
// Fixed frame includes bytecode array and bytecode offset.
static const int kFixedFrameSize =
StandardFrameConstants::kFixedFrameSize + 2 * kPointerSize;
static const int kFixedFrameSizeFromFp =
StandardFrameConstants::kFixedFrameSizeFromFp + 2 * kPointerSize;
// FP-relative.
static const int kLastParamFromFp = StandardFrameConstants::kCallerSPOffset;
static const int kCallerPCOffsetFromFp =
StandardFrameConstants::kCallerPCOffset;
static const int kBytecodeArrayFromFp =
-StandardFrameConstants::kFixedFrameSizeFromFp - 1 * kPointerSize;
static const int kBytecodeOffsetFromFp =
-StandardFrameConstants::kFixedFrameSizeFromFp - 2 * kPointerSize;
static const int kRegisterFileFromFp =
-StandardFrameConstants::kFixedFrameSizeFromFp - 3 * kPointerSize;
static const int kExpressionsOffset = kRegisterFileFromFp;
// Number of fixed slots in addition to a {StandardFrame}.
static const int kExtraSlotCount =
InterpreterFrameConstants::kFixedFrameSize / kPointerSize -
StandardFrameConstants::kFixedFrameSize / kPointerSize;
// Expression index for {StandardFrame::GetExpressionAddress}.
static const int kBytecodeArrayExpressionIndex = -2;
static const int kBytecodeOffsetExpressionIndex = -1;
static const int kRegisterFileExpressionIndex = 0;
// Returns the number of stack slots needed for 'register_count' registers.
// This is needed because some architectures must pad the stack frame with
// additional stack slots to ensure the stack pointer is aligned.
static int RegisterStackSlotCount(int register_count);
};
inline static int FPOffsetToFrameSlot(int frame_offset) {
return StandardFrameConstants::kFixedSlotCountAboveFp - 1 -
frame_offset / kPointerSize;
}
inline static int FrameSlotToFPOffset(int slot) {
return (StandardFrameConstants::kFixedSlotCountAboveFp - 1 - slot) *
kPointerSize;
}
} // namespace internal
} // namespace v8
#if V8_TARGET_ARCH_IA32
#include "src/ia32/frame-constants-ia32.h" // NOLINT
#elif V8_TARGET_ARCH_X64
#include "src/x64/frame-constants-x64.h" // NOLINT
#elif V8_TARGET_ARCH_ARM64
#include "src/arm64/frame-constants-arm64.h" // NOLINT
#elif V8_TARGET_ARCH_ARM
#include "src/arm/frame-constants-arm.h" // NOLINT
#elif V8_TARGET_ARCH_PPC
#include "src/ppc/frame-constants-ppc.h" // NOLINT
#elif V8_TARGET_ARCH_MIPS
#include "src/mips/frame-constants-mips.h" // NOLINT
#elif V8_TARGET_ARCH_MIPS64
#include "src/mips64/frame-constants-mips64.h" // NOLINT
#elif V8_TARGET_ARCH_S390
#include "src/s390/frame-constants-s390.h" // NOLINT
#else
#error Unsupported target architecture.
#endif
#endif // V8_FRAME_CONSTANTS_H_
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