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 31 namespace v8 { 32 namespace internal { 33 34 35 // Register lists 36 // Note that the bit values must match those used in actual instruction encoding 37 const int kNumRegs = 8; 38 39 40 // Caller-saved registers 41 const 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 48 const int kNumJSCallerSaved = 5; 49 50 typedef Object* JSCallerSavedBuffer[kNumJSCallerSaved]; 51 52 53 // Number of registers for which space is reserved in safepoints. 54 const int kNumSafepointRegisters = 8; 55 56 // ---------------------------------------------------- 57 58 59 class 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 71 class 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 82 class 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 96 class 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 }; 110 111 112 class 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 }; 123 124 125 class ArgumentsAdaptorFrameConstants : public AllStatic { 126 public: 127 static const int kLengthOffset = StandardFrameConstants::kExpressionsOffset; 128 static const int kFrameSize = 129 StandardFrameConstants::kFixedFrameSize + kPointerSize; 130 }; 131 132 133 class InternalFrameConstants : public AllStatic { 134 public: 135 static const int kCodeOffset = StandardFrameConstants::kExpressionsOffset; 136 }; 137 138 139 inline 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
