1 // Copyright 2012 the V8 project authors. All rights reserved. 2 // Use of this source code is governed by a BSD-style license that can be 3 // found in the LICENSE file. 4 5 #ifndef V8_X87_FRAMES_X87_H_ 6 #define V8_X87_FRAMES_X87_H_ 7 8 namespace v8 { 9 namespace internal { 10 11 12 // Register lists 13 // Note that the bit values must match those used in actual instruction encoding 14 const int kNumRegs = 8; 15 16 17 // Caller-saved registers 18 const RegList kJSCallerSaved = 19 1 << 0 | // eax 20 1 << 1 | // ecx 21 1 << 2 | // edx 22 1 << 3 | // ebx - used as a caller-saved register in JavaScript code 23 1 << 7; // edi - callee function 24 25 const int kNumJSCallerSaved = 5; 26 27 28 // Number of registers for which space is reserved in safepoints. 29 const int kNumSafepointRegisters = 8; 30 31 const int kNoAlignmentPadding = 0; 32 const int kAlignmentPaddingPushed = 2; 33 const int kAlignmentZapValue = 0x12345678; // Not heap object tagged. 34 35 // ---------------------------------------------------- 36 37 38 class EntryFrameConstants : public AllStatic { 39 public: 40 static const int kCallerFPOffset = -6 * kPointerSize; 41 42 static const int kNewTargetArgOffset = +2 * kPointerSize; 43 static const int kFunctionArgOffset = +3 * kPointerSize; 44 static const int kReceiverArgOffset = +4 * kPointerSize; 45 static const int kArgcOffset = +5 * kPointerSize; 46 static const int kArgvOffset = +6 * kPointerSize; 47 }; 48 49 50 class ExitFrameConstants : public AllStatic { 51 public: 52 static const int kFrameSize = 2 * kPointerSize; 53 54 static const int kCodeOffset = -2 * kPointerSize; 55 static const int kSPOffset = -1 * kPointerSize; 56 57 static const int kCallerFPOffset = 0 * kPointerSize; 58 static const int kCallerPCOffset = +1 * kPointerSize; 59 60 // FP-relative displacement of the caller's SP. It points just 61 // below the saved PC. 62 static const int kCallerSPDisplacement = +2 * kPointerSize; 63 64 static const int kConstantPoolOffset = 0; // Not used 65 }; 66 67 68 class JavaScriptFrameConstants : public AllStatic { 69 public: 70 // FP-relative. 71 static const int kLocal0Offset = StandardFrameConstants::kExpressionsOffset; 72 static const int kLastParameterOffset = +2 * kPointerSize; 73 static const int kFunctionOffset = StandardFrameConstants::kMarkerOffset; 74 75 // Caller SP-relative. 76 static const int kParam0Offset = -2 * kPointerSize; 77 static const int kReceiverOffset = -1 * kPointerSize; 78 79 static const int kDynamicAlignmentStateOffset = kLocal0Offset; 80 }; 81 82 83 } // namespace internal 84 } // namespace v8 85 86 #endif // V8_X87_FRAMES_X87_H_ 87