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 // ---------------------------------------------------- 32 33 34 class EntryFrameConstants : public AllStatic { 35 public: 36 static const int kCallerFPOffset = -6 * kPointerSize; 37 38 static const int kNewTargetArgOffset = +2 * kPointerSize; 39 static const int kFunctionArgOffset = +3 * kPointerSize; 40 static const int kReceiverArgOffset = +4 * kPointerSize; 41 static const int kArgcOffset = +5 * kPointerSize; 42 static const int kArgvOffset = +6 * kPointerSize; 43 }; 44 45 class ExitFrameConstants : public TypedFrameConstants { 46 public: 47 static const int kSPOffset = TYPED_FRAME_PUSHED_VALUE_OFFSET(0); 48 static const int kCodeOffset = TYPED_FRAME_PUSHED_VALUE_OFFSET(1); 49 DEFINE_TYPED_FRAME_SIZES(2); 50 51 static const int kCallerFPOffset = 0 * kPointerSize; 52 static const int kCallerPCOffset = +1 * kPointerSize; 53 54 // FP-relative displacement of the caller's SP. It points just 55 // below the saved PC. 56 static const int kCallerSPDisplacement = +2 * kPointerSize; 57 58 static const int kConstantPoolOffset = 0; // Not used 59 }; 60 61 62 class JavaScriptFrameConstants : public AllStatic { 63 public: 64 // FP-relative. 65 static const int kLocal0Offset = StandardFrameConstants::kExpressionsOffset; 66 static const int kLastParameterOffset = +2 * kPointerSize; 67 static const int kFunctionOffset = StandardFrameConstants::kFunctionOffset; 68 69 // Caller SP-relative. 70 static const int kParam0Offset = -2 * kPointerSize; 71 static const int kReceiverOffset = -1 * kPointerSize; 72 }; 73 74 75 } // namespace internal 76 } // namespace v8 77 78 #endif // V8_X87_FRAMES_X87_H_ 79
