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// Copyright 2006-2008 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
static const int kNumRegs = 8;
// Caller-saved registers
static 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
static const int kNumJSCallerSaved = 5;
typedef Object* JSCallerSavedBuffer[kNumJSCallerSaved];
// ----------------------------------------------------
class StackHandlerConstants : public AllStatic {
public:
static const int kNextOffset = 0 * kPointerSize;
static const int kPPOffset = 1 * kPointerSize;
static const int kFPOffset = 2 * kPointerSize;
// TODO(1233780): Get rid of the code slot in stack handlers.
static const int kCodeOffset = 3 * kPointerSize;
static const int kStateOffset = 4 * kPointerSize;
static const int kPCOffset = 5 * kPointerSize;
static const int kAddressDisplacement = -1 * kPointerSize;
static const int kSize = kPCOffset + 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 kDebugMarkOffset = -2 * kPointerSize;
static const int kSPOffset = -1 * kPointerSize;
// Let the parameters pointer for exit frames point just below the
// frame structure on the stack (frame pointer and return address).
static const int kPPDisplacement = +2 * kPointerSize;
static const int kCallerFPOffset = 0 * kPointerSize;
static const int kCallerPCOffset = +1 * kPointerSize;
};
class StandardFrameConstants : public AllStatic {
public:
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 kSavedRegistersOffset = +2 * kPointerSize;
static const int kFunctionOffset = StandardFrameConstants::kMarkerOffset;
// CallerSP-relative (aka PP-relative)
static const int kParam0Offset = -2 * kPointerSize;
static const int kReceiverOffset = -1 * kPointerSize;
};
class ArgumentsAdaptorFrameConstants : public AllStatic {
public:
static const int kLengthOffset = StandardFrameConstants::kExpressionsOffset;
};
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);
}
// ----------------------------------------------------
// C Entry frames:
// lower | Stack |
// addresses | ^ |
// | | |
// | |
// +-------------+
// | entry_pc |
// +-------------+ <--+ entry_sp
// . |
// . |
// . |
// +-------------+ |
// -3 | entry_sp --+----+
// e +-------------+
// n -2 | C function |
// t +-------------+
// r -1 | caller_pp |
// y +-------------+ <--- fp (frame pointer, ebp)
// 0 | caller_fp |
// f +-------------+
// r 1 | caller_pc |
// a +-------------+ <--- caller_sp (stack pointer, esp)
// m 2 | |
// e | arguments |
// | |
// +- - - - - - -+
// | argument0 |
// +=============+
// | |
// | caller |
// higher | expressions |
// addresses | |
// Proper JS frames:
// lower | Stack |
// addresses | ^ |
// | | |
// | |
// ----------- +=============+ <--- sp (stack pointer, esp)
// | function |
// +-------------+
// | |
// | expressions |
// | |
// +-------------+
// a | |
// c | locals |
// t | |
// i +- - - - - - -+ <---
// v -4 | local0 | ^
// a +-------------+ |
// t -3 | code | |
// i +-------------+ |
// o -2 | context | | kLocal0Offset
// n +-------------+ |
// -1 | caller_pp | v
// f +-------------+ <--- fp (frame pointer, ebp)
// r 0 | caller_fp |
// a +-------------+
// m 1 | caller_pc |
// e +-------------+ <--- caller_sp (incl. parameters)
// 2 | |
// | parameters |
// | |
// +- - - - - - -+ <---
// -2 | parameter0 | ^
// +-------------+ | kParam0Offset
// -1 | receiver | v
// ----------- +=============+ <--- pp (parameter pointer, edi)
// 0 | function |
// +-------------+
// | |
// | caller |
// higher | expressions |
// addresses | |
// JS entry frames: When calling from C to JS, we construct two extra
// frames: An entry frame (C) and a trampoline frame (JS). The
// following pictures shows the two frames:
// lower | Stack |
// addresses | ^ |
// | | |
// | |
// ----------- +=============+ <--- sp (stack pointer, esp)
// | |
// | parameters |
// t | |
// r +- - - - - - -+
// a | parameter0 |
// m +-------------+
// p | receiver |
// o +-------------+ <---
// l | function | ^
// i +-------------+ |
// n -3 | code | | kLocal0Offset
// e +-------------+
// -2 | NULL | context is always NULL
// +-------------+
// f -1 | NULL | caller pp is always NULL for entry frames
// r +-------------+ <--- fp (frame pointer, ebp)
// a 0 | caller fp |
// m +-------------+
// e 1 | caller pc |
// +-------------+ <--- caller_sp (incl. parameters)
// | 0 |
// ----------- +=============+ <--- pp (parameter pointer, edi)
// | 0 |
// +-------------+ <---
// . ^
// . | try-handler (HandlerOffsets::kSize)
// . v
// +-------------+ <---
// -5 | next top pp |
// +-------------+
// e -4 | next top fp |
// n +-------------+ <---
// t -3 | ebx | ^
// r +-------------+ |
// y -2 | esi | | callee-saved registers
// +-------------+ |
// -1 | edi | v
// f +-------------+ <--- fp
// r 0 | caller fp |
// a +-------------+ pp == NULL (parameter pointer)
// m 1 | caller pc |
// e +-------------+ <--- caller sp
// 2 | code entry | ^
// +-------------+ |
// 3 | function | |
// +-------------+ | arguments passed from C code
// 4 | receiver | |
// +-------------+ |
// 5 | argc | |
// +-------------+ |
// 6 | argv | v
// +-------------+ <---
// | |
// higher | |
// addresses | |
} } // namespace v8::internal
#endif // V8_IA32_FRAMES_IA32_H_
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