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      1 // Copyright 2013 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 #include "src/arm64/assembler-arm64.h"
      6 #include "src/arm64/constants-arm64.h"
      7 
      8 #ifndef V8_ARM64_FRAMES_ARM64_H_
      9 #define V8_ARM64_FRAMES_ARM64_H_
     10 
     11 namespace v8 {
     12 namespace internal {
     13 
     14 const int kNumRegs = kNumberOfRegisters;
     15 // Registers x0-x17 are caller-saved.
     16 const int kNumJSCallerSaved = 18;
     17 const RegList kJSCallerSaved = 0x3ffff;
     18 
     19 // Number of registers for which space is reserved in safepoints. Must be a
     20 // multiple of eight.
     21 // TODO(all): Refine this number.
     22 const int kNumSafepointRegisters = 32;
     23 
     24 // Define the list of registers actually saved at safepoints.
     25 // Note that the number of saved registers may be smaller than the reserved
     26 // space, i.e. kNumSafepointSavedRegisters <= kNumSafepointRegisters.
     27 #define kSafepointSavedRegisters CPURegList::GetSafepointSavedRegisters().list()
     28 #define kNumSafepointSavedRegisters \
     29   CPURegList::GetSafepointSavedRegisters().Count();
     30 
     31 class EntryFrameConstants : public AllStatic {
     32  public:
     33   static const int kCallerFPOffset =
     34       -(StandardFrameConstants::kFixedFrameSizeFromFp + kPointerSize);
     35 };
     36 
     37 class ExitFrameConstants : public TypedFrameConstants {
     38  public:
     39   static const int kSPOffset = TYPED_FRAME_PUSHED_VALUE_OFFSET(0);
     40   static const int kCodeOffset = TYPED_FRAME_PUSHED_VALUE_OFFSET(1);
     41   DEFINE_TYPED_FRAME_SIZES(2);
     42   static const int kLastExitFrameField   = kCodeOffset;
     43 
     44   static const int kConstantPoolOffset   = 0;  // Not used
     45 };
     46 
     47 
     48 class JavaScriptFrameConstants : public AllStatic {
     49  public:
     50   // FP-relative.
     51   static const int kLocal0Offset = StandardFrameConstants::kExpressionsOffset;
     52 
     53   // There are two words on the stack (saved fp and saved lr) between fp and
     54   // the arguments.
     55   static const int kLastParameterOffset = 2 * kPointerSize;
     56 
     57   static const int kFunctionOffset = StandardFrameConstants::kFunctionOffset;
     58 };
     59 
     60 
     61 }  // namespace internal
     62 }  // namespace v8
     63 
     64 #endif  // V8_ARM64_FRAMES_ARM64_H_
     65