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      1 // Copyright 2016 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/eh-frame.h"
      6 
      7 namespace v8 {
      8 namespace internal {
      9 
     10 static const int kR0DwarfCode = 0;
     11 static const int kFpDwarfCode = 11;
     12 static const int kSpDwarfCode = 13;
     13 static const int kLrDwarfCode = 14;
     14 
     15 const int EhFrameConstants::kCodeAlignmentFactor = 4;
     16 const int EhFrameConstants::kDataAlignmentFactor = -4;
     17 
     18 void EhFrameWriter::WriteReturnAddressRegisterCode() {
     19   WriteULeb128(kLrDwarfCode);
     20 }
     21 
     22 void EhFrameWriter::WriteInitialStateInCie() {
     23   SetBaseAddressRegisterAndOffset(fp, 0);
     24   RecordRegisterNotModified(lr);
     25 }
     26 
     27 // static
     28 int EhFrameWriter::RegisterToDwarfCode(Register name) {
     29   switch (name.code()) {
     30     case Register::kCode_fp:
     31       return kFpDwarfCode;
     32     case Register::kCode_sp:
     33       return kSpDwarfCode;
     34     case Register::kCode_lr:
     35       return kLrDwarfCode;
     36     case Register::kCode_r0:
     37       return kR0DwarfCode;
     38     default:
     39       UNIMPLEMENTED();
     40       return -1;
     41   }
     42 }
     43 
     44 #ifdef ENABLE_DISASSEMBLER
     45 
     46 // static
     47 const char* EhFrameDisassembler::DwarfRegisterCodeToString(int code) {
     48   switch (code) {
     49     case kFpDwarfCode:
     50       return "fp";
     51     case kSpDwarfCode:
     52       return "sp";
     53     case kLrDwarfCode:
     54       return "lr";
     55     default:
     56       UNIMPLEMENTED();
     57       return nullptr;
     58   }
     59 }
     60 
     61 #endif
     62 
     63 }  // namespace internal
     64 }  // namespace v8
     65