// Copyright 2016 the V8 project authors. All rights reserved.
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// Use of this source code is governed by a BSD-style license that can be
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// found in the LICENSE file.
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#include "src/eh-frame.h"
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namespace v8 {
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namespace internal {
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static const int kR0DwarfCode = 0;
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static const int kFpDwarfCode = 11;
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static const int kSpDwarfCode = 13;
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static const int kLrDwarfCode = 14;
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const int EhFrameConstants::kCodeAlignmentFactor = 4;
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const int EhFrameConstants::kDataAlignmentFactor = -4;
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void EhFrameWriter::WriteReturnAddressRegisterCode() {
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WriteULeb128(kLrDwarfCode);
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}
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void EhFrameWriter::WriteInitialStateInCie() {
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SetBaseAddressRegisterAndOffset(fp, 0);
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RecordRegisterNotModified(lr);
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}
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// static
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int EhFrameWriter::RegisterToDwarfCode(Register name) {
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switch (name.code()) {
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case kRegCode_fp:
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return kFpDwarfCode;
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case kRegCode_sp:
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return kSpDwarfCode;
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case kRegCode_lr:
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return kLrDwarfCode;
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case kRegCode_r0:
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return kR0DwarfCode;
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default:
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UNIMPLEMENTED();
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return -1;
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}
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}
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#ifdef ENABLE_DISASSEMBLER
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// static
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const char* EhFrameDisassembler::DwarfRegisterCodeToString(int code) {
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switch (code) {
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case kFpDwarfCode:
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return "fp";
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case kSpDwarfCode:
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return "sp";
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case kLrDwarfCode:
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return "lr";
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default:
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UNIMPLEMENTED();
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return nullptr;
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}
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}
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#endif
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} // namespace internal
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} // namespace v8
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