1// Copyright 2012 the V8 project authors. All rights reserved. 2// Redistribution and use in source and binary forms, with or without 3// modification, are permitted provided that the following conditions are 4// met: 5// 6// * Redistributions of source code must retain the above copyright 7// notice, this list of conditions and the following disclaimer. 8// * Redistributions in binary form must reproduce the above 9// copyright notice, this list of conditions and the following 10// disclaimer in the documentation and/or other materials provided 11// with the distribution. 12// * Neither the name of Google Inc. nor the names of its 13// contributors may be used to endorse or promote products derived 14// from this software without specific prior written permission. 15// 16// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS 17// "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT 18// LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR 19// A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT 20// OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, 21// SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT 22// LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, 23// DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY 24// THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT 25// (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE 26// OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. 27 28#ifndef V8_IA32_FRAMES_IA32_H_ 29#define V8_IA32_FRAMES_IA32_H_ 30 31namespace v8 { 32namespace internal { 33 34 35// Register lists 36// Note that the bit values must match those used in actual instruction encoding 37const int kNumRegs = 8; 38 39 40// Caller-saved registers 41const RegList kJSCallerSaved = 42 1 << 0 | // eax 43 1 << 1 | // ecx 44 1 << 2 | // edx 45 1 << 3 | // ebx - used as a caller-saved register in JavaScript code 46 1 << 7; // edi - callee function 47 48const int kNumJSCallerSaved = 5; 49 50typedef Object* JSCallerSavedBuffer[kNumJSCallerSaved]; 51 52 53// Number of registers for which space is reserved in safepoints. 54const int kNumSafepointRegisters = 8; 55 56// ---------------------------------------------------- 57 58 59class StackHandlerConstants : public AllStatic { 60 public: 61 static const int kNextOffset = 0 * kPointerSize; 62 static const int kCodeOffset = 1 * kPointerSize; 63 static const int kStateOffset = 2 * kPointerSize; 64 static const int kContextOffset = 3 * kPointerSize; 65 static const int kFPOffset = 4 * kPointerSize; 66 67 static const int kSize = kFPOffset + kPointerSize; 68}; 69 70 71class EntryFrameConstants : public AllStatic { 72 public: 73 static const int kCallerFPOffset = -6 * kPointerSize; 74 75 static const int kFunctionArgOffset = +3 * kPointerSize; 76 static const int kReceiverArgOffset = +4 * kPointerSize; 77 static const int kArgcOffset = +5 * kPointerSize; 78 static const int kArgvOffset = +6 * kPointerSize; 79}; 80 81 82class ExitFrameConstants : public AllStatic { 83 public: 84 static const int kCodeOffset = -2 * kPointerSize; 85 static const int kSPOffset = -1 * kPointerSize; 86 87 static const int kCallerFPOffset = 0 * kPointerSize; 88 static const int kCallerPCOffset = +1 * kPointerSize; 89 90 // FP-relative displacement of the caller's SP. It points just 91 // below the saved PC. 92 static const int kCallerSPDisplacement = +2 * kPointerSize; 93}; 94 95 96class StandardFrameConstants : public AllStatic { 97 public: 98 // Fixed part of the frame consists of return address, caller fp, 99 // context and function. 100 // StandardFrame::IterateExpressions assumes that kContextOffset is the last 101 // object pointer. 102 static const int kFixedFrameSize = 4 * kPointerSize; 103 static const int kExpressionsOffset = -3 * kPointerSize; 104 static const int kMarkerOffset = -2 * kPointerSize; 105 static const int kContextOffset = -1 * kPointerSize; 106 static const int kCallerFPOffset = 0 * kPointerSize; 107 static const int kCallerPCOffset = +1 * kPointerSize; 108 static const int kCallerSPOffset = +2 * kPointerSize; 109}; 110 111 112class JavaScriptFrameConstants : public AllStatic { 113 public: 114 // FP-relative. 115 static const int kLocal0Offset = StandardFrameConstants::kExpressionsOffset; 116 static const int kLastParameterOffset = +2 * kPointerSize; 117 static const int kFunctionOffset = StandardFrameConstants::kMarkerOffset; 118 119 // Caller SP-relative. 120 static const int kParam0Offset = -2 * kPointerSize; 121 static const int kReceiverOffset = -1 * kPointerSize; 122}; 123 124 125class ArgumentsAdaptorFrameConstants : public AllStatic { 126 public: 127 static const int kLengthOffset = StandardFrameConstants::kExpressionsOffset; 128 static const int kFrameSize = 129 StandardFrameConstants::kFixedFrameSize + kPointerSize; 130}; 131 132 133class InternalFrameConstants : public AllStatic { 134 public: 135 static const int kCodeOffset = StandardFrameConstants::kExpressionsOffset; 136}; 137 138 139inline Object* JavaScriptFrame::function_slot_object() const { 140 const int offset = JavaScriptFrameConstants::kFunctionOffset; 141 return Memory::Object_at(fp() + offset); 142} 143 144 145} } // namespace v8::internal 146 147#endif // V8_IA32_FRAMES_IA32_H_ 148