Reland Implement .eh_frame writer and disassembler.
Original commit message: Also, CodeGenerator::MakeCodeEpilogue now accepts an optional pointer to a EhFrameWriter and will attach unwinding information to the code object when passed one. Reason for reverting: The STATIC_CONST_MEMBER_DEFINITION in eh-frame-writer-unittest.cc causes a compiler error on V8 Win64 - clang buildbot. Removing that bit. BUG=v8:4899 LOG=N Review-Url: https://codereview.chromium.org/2023503002 Cr-Commit-Position: refs/heads/master@{#37707}
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ssanfilippo
Commit bot
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35e501bf15
commit
b413f0ebe1
3
BUILD.gn
3
BUILD.gn
@ -1635,6 +1635,7 @@ v8_source_set("v8_base") {
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"src/x64/cpu-x64.cc",
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"src/x64/deoptimizer-x64.cc",
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"src/x64/disasm-x64.cc",
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"src/x64/eh-frame-x64.cc",
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"src/x64/frames-x64.cc",
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"src/x64/frames-x64.h",
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"src/x64/interface-descriptors-x64.cc",
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@ -1656,6 +1657,7 @@ v8_source_set("v8_base") {
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"src/arm/cpu-arm.cc",
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"src/arm/deoptimizer-arm.cc",
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"src/arm/disasm-arm.cc",
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"src/arm/eh-frame-arm.cc",
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"src/arm/frames-arm.cc",
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"src/arm/frames-arm.h",
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"src/arm/interface-descriptors-arm.cc",
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@ -1702,6 +1704,7 @@ v8_source_set("v8_base") {
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"src/arm64/deoptimizer-arm64.cc",
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"src/arm64/disasm-arm64.cc",
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"src/arm64/disasm-arm64.h",
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"src/arm64/eh-frame-arm64.cc",
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"src/arm64/frames-arm64.cc",
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"src/arm64/frames-arm64.h",
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"src/arm64/instructions-arm64.cc",
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67
src/arm/eh-frame-arm.cc
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67
src/arm/eh-frame-arm.cc
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@ -0,0 +1,67 @@
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// 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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STATIC_CONST_MEMBER_DEFINITION const int
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EhFrameConstants::kCodeAlignmentFactor = 4;
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STATIC_CONST_MEMBER_DEFINITION const int
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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 Register::kCode_fp:
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return kFpDwarfCode;
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case Register::kCode_sp:
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return kSpDwarfCode;
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case Register::kCode_lr:
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return kLrDwarfCode;
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case Register::kCode_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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72
src/arm64/eh-frame-arm64.cc
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72
src/arm64/eh-frame-arm64.cc
Normal file
@ -0,0 +1,72 @@
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// 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 kX0DwarfCode = 0;
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static const int kJsSpDwarfCode = 28;
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static const int kFpDwarfCode = 29;
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static const int kLrDwarfCode = 30;
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static const int kCSpDwarfCode = 31;
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STATIC_CONST_MEMBER_DEFINITION const int
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EhFrameConstants::kCodeAlignmentFactor = 4;
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STATIC_CONST_MEMBER_DEFINITION const int
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EhFrameConstants::kDataAlignmentFactor = -8;
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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(x29, 0);
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RecordRegisterNotModified(x30);
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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 Register::kCode_x28:
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return kJsSpDwarfCode;
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case Register::kCode_x29:
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return kFpDwarfCode;
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case Register::kCode_x30:
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return kLrDwarfCode;
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case Register::kCode_x31:
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return kCSpDwarfCode;
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case Register::kCode_x0:
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return kX0DwarfCode;
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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 kLrDwarfCode:
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return "lr";
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case kJsSpDwarfCode:
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return "jssp";
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case kCSpDwarfCode:
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return "csp"; // This could be zr as well
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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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@ -11,6 +11,7 @@
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#include "src/bootstrapper.h"
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#include "src/compiler.h"
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#include "src/debug/debug.h"
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#include "src/eh-frame.h"
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#include "src/parsing/parser.h"
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#include "src/runtime/runtime.h"
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@ -117,8 +118,8 @@ void CodeGenerator::MakeCodePrologue(CompilationInfo* info, const char* kind) {
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#endif // DEBUG
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}
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Handle<Code> CodeGenerator::MakeCodeEpilogue(MacroAssembler* masm,
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EhFrameWriter* eh_frame_writer,
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CompilationInfo* info) {
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Isolate* isolate = info->isolate();
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@ -129,6 +130,7 @@ Handle<Code> CodeGenerator::MakeCodeEpilogue(MacroAssembler* masm,
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Code::ExtractKindFromFlags(flags) == Code::OPTIMIZED_FUNCTION ||
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info->IsStub();
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masm->GetCode(&desc);
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if (eh_frame_writer) eh_frame_writer->GetEhFrame(&desc);
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Handle<Code> code =
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isolate->factory()->NewCode(desc, flags, masm->CodeObject(),
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false, is_crankshafted,
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@ -69,7 +69,7 @@ namespace internal {
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class CompilationInfo;
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class EhFrameWriter;
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class CodeGenerator {
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public:
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@ -78,6 +78,7 @@ class CodeGenerator {
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// Allocate and install the code.
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static Handle<Code> MakeCodeEpilogue(MacroAssembler* masm,
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EhFrameWriter* unwinding,
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CompilationInfo* info);
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// Print the code after compiling it.
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@ -204,7 +204,7 @@ Handle<Code> CodeGenerator::GenerateCode() {
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safepoints()->Emit(masm(), frame()->GetTotalFrameSlotCount());
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Handle<Code> result =
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v8::internal::CodeGenerator::MakeCodeEpilogue(masm(), info);
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v8::internal::CodeGenerator::MakeCodeEpilogue(masm(), nullptr, info);
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result->set_is_turbofanned(true);
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result->set_stack_slots(frame()->GetTotalFrameSlotCount());
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result->set_safepoint_table_offset(safepoints()->GetCodeOffset());
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@ -457,7 +457,8 @@ Handle<Code> LChunk::Codegen() {
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if (generator.GenerateCode()) {
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generator.CheckEnvironmentUsage();
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CodeGenerator::MakeCodePrologue(info(), "optimized");
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Handle<Code> code = CodeGenerator::MakeCodeEpilogue(&assembler, info());
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Handle<Code> code =
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CodeGenerator::MakeCodeEpilogue(&assembler, nullptr, info());
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generator.FinishCode(code);
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CommitDependencies(code);
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generator.source_position_table_builder()->EndJitLogging(
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696
src/eh-frame.cc
696
src/eh-frame.cc
@ -3,94 +3,632 @@
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// found in the LICENSE file.
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#include "src/eh-frame.h"
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#include "src/objects-inl.h"
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#include "src/objects.h"
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#include <iomanip>
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#include <ostream>
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#if !defined(V8_TARGET_ARCH_X64) && !defined(V8_TARGET_ARCH_ARM) && \
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!defined(V8_TARGET_ARCH_ARM64)
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// Placeholders for unsupported architectures.
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namespace v8 {
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namespace internal {
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static const int DW_EH_PE_pcrel = 0x10;
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static const int DW_EH_PE_datarel = 0x30;
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static const int DW_EH_PE_udata4 = 0x03;
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static const int DW_EH_PE_sdata4 = 0x0b;
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STATIC_CONST_MEMBER_DEFINITION const int
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EhFrameConstants::kCodeAlignmentFactor = 1;
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const int EhFrameHdr::kCIESize = 0;
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STATIC_CONST_MEMBER_DEFINITION const int
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EhFrameConstants::kDataAlignmentFactor = 1;
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static const int kVersionSize = 1;
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static const int kEncodingSpecifiersSize = 3;
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void EhFrameWriter::WriteReturnAddressRegisterCode() { UNIMPLEMENTED(); }
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//
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// In order to calculate offsets in the .eh_frame_hdr, we must know the layout
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// of the DSO generated by perf inject, which is assumed to be the following:
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//
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// | ... | |
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// +---------------+ <-- (F) --- | Larger offsets in file
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// | | ^ |
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// | Instructions | | .text v
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// | | v
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// +---------------+ <-- (E) ---
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// |///////////////|
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// |////Padding////|
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// |///////////////|
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// +---------------+ <-- (D) ---
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// | | ^
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// | CIE | |
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// | | |
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// +---------------+ <-- (C) | .eh_frame
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// | | |
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// | FDE | |
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// | | v
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// +---------------+ <-- (B) ---
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// | version | ^
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// +---------------+ |
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// | encoding | |
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// | specifiers | |
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// +---------------+ <---(A) | .eh_frame_hdr
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// | offset to | |
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// | .eh_frame | |
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// +---------------+ |
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// | ... | ...
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//
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// (F) is aligned at a 16-byte boundary.
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// (D) is aligned at a 8-byte boundary.
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// (B) is aligned at a 4-byte boundary.
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// (E), (C) and (A) have no alignment requirements.
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//
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// The distance between (A) and (B) is 4 bytes.
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//
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// The size of the .eh_frame is required to be a multiple of the pointer size,
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// which means that (B) will be naturally aligned to a 4-byte boundary on all
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// the architectures we support.
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//
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// Because (E) has no alignment requirements, there is padding between (E) and
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// (D). (F) is aligned at a 16-byte boundary, thus to a 8-byte one as well.
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//
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EhFrameHdr::EhFrameHdr(Code* code) {
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int code_size = code->is_crankshafted() ? code->safepoint_table_offset()
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: code->instruction_size();
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version_ = 1;
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eh_frame_ptr_encoding_ = DW_EH_PE_sdata4 | DW_EH_PE_pcrel;
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lut_size_encoding_ = DW_EH_PE_udata4;
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lut_entries_encoding_ = DW_EH_PE_sdata4 | DW_EH_PE_datarel;
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void EhFrameWriter::WriteInitialStateInCie() { UNIMPLEMENTED(); }
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// .eh_frame pointer and LUT
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if (code->has_unwinding_info()) {
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DCHECK_GE(code->unwinding_info_size(), EhFrameHdr::kRecordSize);
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int eh_frame_size = code->unwinding_info_size() - EhFrameHdr::kRecordSize;
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offset_to_eh_frame_ =
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-(eh_frame_size + kVersionSize + kEncodingSpecifiersSize); // A -> D
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lut_entries_number_ = 1;
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offset_to_procedure_ = -(RoundUp(code_size, 8) + eh_frame_size); // B -> F
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offset_to_fde_ = -(eh_frame_size - kCIESize); // B -> C
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} else {
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// Create a dummy table
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offset_to_eh_frame_ = 0;
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lut_entries_number_ = 0;
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offset_to_procedure_ = 0;
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offset_to_fde_ = 0;
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}
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int EhFrameWriter::RegisterToDwarfCode(Register) {
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UNIMPLEMENTED();
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return -1;
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}
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#ifdef ENABLE_DISASSEMBLER
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const char* EhFrameDisassembler::DwarfRegisterCodeToString(int) {
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UNIMPLEMENTED();
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return nullptr;
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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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#endif
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namespace v8 {
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namespace internal {
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STATIC_CONST_MEMBER_DEFINITION const int
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EhFrameConstants::kEhFrameTerminatorSize;
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STATIC_CONST_MEMBER_DEFINITION const int EhFrameConstants::kEhFrameHdrVersion;
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STATIC_CONST_MEMBER_DEFINITION const int EhFrameConstants::kEhFrameHdrSize;
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STATIC_CONST_MEMBER_DEFINITION const uint32_t EhFrameWriter::kInt32Placeholder;
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// static
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void EhFrameWriter::WriteEmptyEhFrame(std::ostream& stream) { // NOLINT
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stream.put(EhFrameConstants::kEhFrameHdrVersion);
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// .eh_frame pointer encoding specifier.
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stream.put(EhFrameConstants::kSData4 | EhFrameConstants::kPcRel);
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// Lookup table size encoding.
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stream.put(EhFrameConstants::kUData4);
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// Lookup table entries encoding.
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stream.put(EhFrameConstants::kSData4 | EhFrameConstants::kDataRel);
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// Dummy pointers and 0 entries in the lookup table.
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char dummy_data[EhFrameConstants::kEhFrameHdrSize - 4] = {0};
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stream.write(&dummy_data[0], sizeof(dummy_data));
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}
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EhFrameWriter::EhFrameWriter(Zone* zone)
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: cie_size_(0),
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last_pc_offset_(0),
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writer_state_(InternalState::kUndefined),
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base_register_(no_reg),
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base_offset_(0),
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eh_frame_buffer_(zone) {}
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void EhFrameWriter::Initialize() {
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DCHECK(writer_state_ == InternalState::kUndefined);
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eh_frame_buffer_.reserve(128);
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writer_state_ = InternalState::kInitialized;
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WriteCie();
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WriteFdeHeader();
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}
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void EhFrameWriter::WriteCie() {
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static const int kCIEIdentifier = 0;
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static const int kCIEVersion = 3;
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static const int kAugmentationDataSize = 2;
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static const byte kAugmentationString[] = {'z', 'L', 'R', 0};
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// Placeholder for the size of the CIE.
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int size_offset = eh_frame_offset();
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WriteInt32(kInt32Placeholder);
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// CIE identifier and version.
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int record_start_offset = eh_frame_offset();
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WriteInt32(kCIEIdentifier);
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WriteByte(kCIEVersion);
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// Augmentation data contents descriptor: LSDA and FDE encoding.
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WriteBytes(&kAugmentationString[0], sizeof(kAugmentationString));
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// Alignment factors.
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WriteSLeb128(EhFrameConstants::kCodeAlignmentFactor);
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WriteSLeb128(EhFrameConstants::kDataAlignmentFactor);
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WriteReturnAddressRegisterCode();
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// Augmentation data.
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WriteULeb128(kAugmentationDataSize);
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// No language-specific data area (LSDA).
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WriteByte(EhFrameConstants::kOmit);
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// FDE pointers encoding.
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WriteByte(EhFrameConstants::kSData4 | EhFrameConstants::kPcRel);
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// Write directives to build the initial state of the unwinding table.
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DCHECK_EQ(eh_frame_offset() - size_offset,
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EhFrameConstants::kInitialStateOffsetInCie);
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WriteInitialStateInCie();
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// Pad with nops to the next multiple of 8 bytes.
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WritePaddingTo8ByteAlignment();
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int record_end_offset = eh_frame_offset();
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int encoded_cie_size = record_end_offset - record_start_offset;
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cie_size_ = record_end_offset - size_offset;
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// Patch the size of the CIE now that we know it.
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PatchInt32(size_offset, encoded_cie_size);
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}
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void EhFrameWriter::WriteFdeHeader() {
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DCHECK_NE(cie_size_, 0);
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// Placeholder for size of the FDE. Will be filled in Finish().
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DCHECK_EQ(eh_frame_offset(), fde_offset());
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WriteInt32(kInt32Placeholder);
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// Backwards offset to the CIE.
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WriteInt32(cie_size_ + kInt32Size);
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// Placeholder for pointer to procedure. Will be filled in Finish().
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DCHECK_EQ(eh_frame_offset(), GetProcedureAddressOffset());
|
||||
WriteInt32(kInt32Placeholder);
|
||||
|
||||
// Placeholder for size of the procedure. Will be filled in Finish().
|
||||
DCHECK_EQ(eh_frame_offset(), GetProcedureSizeOffset());
|
||||
WriteInt32(kInt32Placeholder);
|
||||
|
||||
// No augmentation data.
|
||||
WriteByte(0);
|
||||
}
|
||||
|
||||
void EhFrameWriter::WriteEhFrameHdr(int code_size) {
|
||||
DCHECK(writer_state_ == InternalState::kInitialized);
|
||||
|
||||
//
|
||||
// In order to calculate offsets in the .eh_frame_hdr, we must know the layout
|
||||
// of the DSO generated by perf inject, which is assumed to be the following:
|
||||
//
|
||||
// | ... | |
|
||||
// +---------------+ <-- (F) --- | Larger offsets in file
|
||||
// | | ^ |
|
||||
// | Instructions | | .text v
|
||||
// | | v
|
||||
// +---------------+ <-- (E) ---
|
||||
// |///////////////|
|
||||
// |////Padding////|
|
||||
// |///////////////|
|
||||
// +---------------+ <-- (D) ---
|
||||
// | | ^
|
||||
// | CIE | |
|
||||
// | | |
|
||||
// +---------------+ <-- (C) |
|
||||
// | | | .eh_frame
|
||||
// | FDE | |
|
||||
// | | |
|
||||
// +---------------+ |
|
||||
// | terminator | v
|
||||
// +---------------+ <-- (B) ---
|
||||
// | version | ^
|
||||
// +---------------+ |
|
||||
// | encoding | |
|
||||
// | specifiers | |
|
||||
// +---------------+ <---(A) | .eh_frame_hdr
|
||||
// | offset to | |
|
||||
// | .eh_frame | |
|
||||
// +---------------+ |
|
||||
// | ... | ...
|
||||
//
|
||||
// (F) is aligned to a 16-byte boundary.
|
||||
// (D) is aligned to a 8-byte boundary.
|
||||
// (B) is aligned to a 4-byte boundary.
|
||||
// (C) is aligned to an addressing unit size boundary.
|
||||
// (E) and (A) have no alignment requirements.
|
||||
//
|
||||
// The distance between (A) and (B) is 4 bytes.
|
||||
//
|
||||
// The size of the FDE is required to be a multiple of the pointer size, which
|
||||
// means that (B) will be naturally aligned to a 4-byte boundary on all the
|
||||
// architectures we support.
|
||||
//
|
||||
// Because (E) has no alignment requirements, there is padding between (E) and
|
||||
// (D). (F) is aligned at a 16-byte boundary, thus to a 8-byte one as well.
|
||||
//
|
||||
|
||||
int eh_frame_size = eh_frame_offset();
|
||||
|
||||
WriteByte(EhFrameConstants::kEhFrameHdrVersion);
|
||||
|
||||
// .eh_frame pointer encoding specifier.
|
||||
WriteByte(EhFrameConstants::kSData4 | EhFrameConstants::kPcRel);
|
||||
// Lookup table size encoding specifier.
|
||||
WriteByte(EhFrameConstants::kUData4);
|
||||
// Lookup table entries encoding specifier.
|
||||
WriteByte(EhFrameConstants::kSData4 | EhFrameConstants::kDataRel);
|
||||
|
||||
// Pointer to .eh_frame, relative to this offset (A -> D in the diagram).
|
||||
WriteInt32(-(eh_frame_size + EhFrameConstants::kFdeVersionSize +
|
||||
EhFrameConstants::kFdeEncodingSpecifiersSize));
|
||||
|
||||
// Number of entries in the LUT, one for the only routine.
|
||||
WriteInt32(1);
|
||||
|
||||
// Pointer to the start of the routine, relative to the beginning of the
|
||||
// .eh_frame_hdr (B -> F in the diagram).
|
||||
WriteInt32(-(RoundUp(code_size, 8) + eh_frame_size));
|
||||
|
||||
// Pointer to the start of the associated FDE, relative to the start of the
|
||||
// .eh_frame_hdr (B -> C in the diagram).
|
||||
WriteInt32(-(eh_frame_size - cie_size_));
|
||||
|
||||
DCHECK_EQ(eh_frame_offset() - eh_frame_size,
|
||||
EhFrameConstants::kEhFrameHdrSize);
|
||||
}
|
||||
|
||||
void EhFrameWriter::WritePaddingTo8ByteAlignment() {
|
||||
DCHECK(writer_state_ == InternalState::kInitialized);
|
||||
|
||||
int unpadded_size = eh_frame_offset();
|
||||
int padded_size = RoundUp(unpadded_size, 8);
|
||||
int padding_size = padded_size - unpadded_size;
|
||||
|
||||
byte nop = static_cast<byte>(EhFrameConstants::DwarfOpcodes::kNop);
|
||||
static const byte kPadding[] = {nop, nop, nop, nop, nop, nop, nop, nop};
|
||||
DCHECK_LE(padding_size, static_cast<int>(sizeof(kPadding)));
|
||||
WriteBytes(&kPadding[0], padding_size);
|
||||
}
|
||||
|
||||
void EhFrameWriter::AdvanceLocation(int pc_offset) {
|
||||
DCHECK(writer_state_ == InternalState::kInitialized);
|
||||
DCHECK_GE(pc_offset, last_pc_offset_);
|
||||
uint32_t delta = pc_offset - last_pc_offset_;
|
||||
|
||||
DCHECK_EQ(delta % EhFrameConstants::kCodeAlignmentFactor, 0);
|
||||
uint32_t factored_delta = delta / EhFrameConstants::kCodeAlignmentFactor;
|
||||
|
||||
if (factored_delta <= EhFrameConstants::kLocationMask) {
|
||||
WriteByte((EhFrameConstants::kLocationTag
|
||||
<< EhFrameConstants::kLocationMaskSize) |
|
||||
(factored_delta & EhFrameConstants::kLocationMask));
|
||||
} else if (factored_delta <= kMaxUInt8) {
|
||||
WriteOpcode(EhFrameConstants::DwarfOpcodes::kAdvanceLoc1);
|
||||
WriteByte(factored_delta);
|
||||
} else if (factored_delta <= kMaxUInt16) {
|
||||
WriteOpcode(EhFrameConstants::DwarfOpcodes::kAdvanceLoc2);
|
||||
WriteInt16(factored_delta);
|
||||
} else {
|
||||
WriteOpcode(EhFrameConstants::DwarfOpcodes::kAdvanceLoc4);
|
||||
WriteInt32(factored_delta);
|
||||
}
|
||||
|
||||
last_pc_offset_ = pc_offset;
|
||||
}
|
||||
|
||||
void EhFrameWriter::SetBaseAddressOffset(int base_offset) {
|
||||
DCHECK(writer_state_ == InternalState::kInitialized);
|
||||
DCHECK_GE(base_offset, 0);
|
||||
WriteOpcode(EhFrameConstants::DwarfOpcodes::kDefCfaOffset);
|
||||
WriteULeb128(base_offset);
|
||||
base_offset_ = base_offset;
|
||||
}
|
||||
|
||||
void EhFrameWriter::SetBaseAddressRegister(Register base_register) {
|
||||
DCHECK(writer_state_ == InternalState::kInitialized);
|
||||
int code = RegisterToDwarfCode(base_register);
|
||||
WriteOpcode(EhFrameConstants::DwarfOpcodes::kDefCfaRegister);
|
||||
WriteULeb128(code);
|
||||
base_register_ = base_register;
|
||||
}
|
||||
|
||||
void EhFrameWriter::SetBaseAddressRegisterAndOffset(Register base_register,
|
||||
int base_offset) {
|
||||
DCHECK(writer_state_ == InternalState::kInitialized);
|
||||
DCHECK_GE(base_offset, 0);
|
||||
int code = RegisterToDwarfCode(base_register);
|
||||
WriteOpcode(EhFrameConstants::DwarfOpcodes::kDefCfa);
|
||||
WriteULeb128(code);
|
||||
WriteULeb128(base_offset);
|
||||
base_offset_ = base_offset;
|
||||
base_register_ = base_register;
|
||||
}
|
||||
|
||||
void EhFrameWriter::RecordRegisterSavedToStack(int register_code, int offset) {
|
||||
DCHECK(writer_state_ == InternalState::kInitialized);
|
||||
DCHECK_EQ(offset % EhFrameConstants::kDataAlignmentFactor, 0);
|
||||
int factored_offset = offset / EhFrameConstants::kDataAlignmentFactor;
|
||||
if (factored_offset >= 0) {
|
||||
DCHECK_LE(register_code, EhFrameConstants::kSavedRegisterMask);
|
||||
WriteByte((EhFrameConstants::kSavedRegisterTag
|
||||
<< EhFrameConstants::kSavedRegisterMaskSize) |
|
||||
(register_code & EhFrameConstants::kSavedRegisterMask));
|
||||
WriteULeb128(factored_offset);
|
||||
} else {
|
||||
WriteOpcode(EhFrameConstants::DwarfOpcodes::kOffsetExtendedSf);
|
||||
WriteULeb128(register_code);
|
||||
WriteSLeb128(factored_offset);
|
||||
}
|
||||
}
|
||||
|
||||
void EhFrameWriter::RecordRegisterNotModified(Register name) {
|
||||
DCHECK(writer_state_ == InternalState::kInitialized);
|
||||
WriteOpcode(EhFrameConstants::DwarfOpcodes::kSameValue);
|
||||
WriteULeb128(RegisterToDwarfCode(name));
|
||||
}
|
||||
|
||||
void EhFrameWriter::RecordRegisterFollowsInitialRule(Register name) {
|
||||
DCHECK(writer_state_ == InternalState::kInitialized);
|
||||
int code = RegisterToDwarfCode(name);
|
||||
DCHECK_LE(code, EhFrameConstants::kFollowInitialRuleMask);
|
||||
WriteByte((EhFrameConstants::kFollowInitialRuleTag
|
||||
<< EhFrameConstants::kFollowInitialRuleMaskSize) |
|
||||
(code & EhFrameConstants::kFollowInitialRuleMask));
|
||||
}
|
||||
|
||||
void EhFrameWriter::Finish(int code_size) {
|
||||
DCHECK(writer_state_ == InternalState::kInitialized);
|
||||
DCHECK_GE(eh_frame_offset(), cie_size_);
|
||||
|
||||
WritePaddingTo8ByteAlignment();
|
||||
|
||||
// Write the size of the FDE now that we know it.
|
||||
// The encoded size does not include the size field itself.
|
||||
int encoded_fde_size = eh_frame_offset() - fde_offset() - kInt32Size;
|
||||
PatchInt32(fde_offset(), encoded_fde_size);
|
||||
|
||||
// Write size and offset to procedure.
|
||||
PatchInt32(GetProcedureAddressOffset(),
|
||||
-(RoundUp(code_size, 8) + GetProcedureAddressOffset()));
|
||||
PatchInt32(GetProcedureSizeOffset(), code_size);
|
||||
|
||||
// Terminate the .eh_frame.
|
||||
static const byte kTerminator[EhFrameConstants::kEhFrameTerminatorSize] = {0};
|
||||
WriteBytes(&kTerminator[0], EhFrameConstants::kEhFrameTerminatorSize);
|
||||
|
||||
WriteEhFrameHdr(code_size);
|
||||
|
||||
writer_state_ = InternalState::kFinalized;
|
||||
}
|
||||
|
||||
void EhFrameWriter::GetEhFrame(CodeDesc* desc) {
|
||||
DCHECK(writer_state_ == InternalState::kFinalized);
|
||||
desc->unwinding_info_size = static_cast<int>(eh_frame_buffer_.size());
|
||||
desc->unwinding_info = eh_frame_buffer_.data();
|
||||
}
|
||||
|
||||
void EhFrameWriter::WriteULeb128(uint32_t value) {
|
||||
do {
|
||||
byte chunk = value & 0x7f;
|
||||
value >>= 7;
|
||||
if (value != 0) chunk |= 0x80;
|
||||
WriteByte(chunk);
|
||||
} while (value != 0);
|
||||
}
|
||||
|
||||
void EhFrameWriter::WriteSLeb128(int32_t value) {
|
||||
static const int kSignBitMask = 0x40;
|
||||
bool done;
|
||||
do {
|
||||
byte chunk = value & 0x7f;
|
||||
value >>= 7;
|
||||
done = ((value == 0) && ((chunk & kSignBitMask) == 0)) ||
|
||||
((value == -1) && ((chunk & kSignBitMask) != 0));
|
||||
if (!done) chunk |= 0x80;
|
||||
WriteByte(chunk);
|
||||
} while (!done);
|
||||
}
|
||||
|
||||
uint32_t EhFrameIterator::GetNextULeb128() {
|
||||
int size = 0;
|
||||
uint32_t result = DecodeULeb128(next_, &size);
|
||||
DCHECK_LE(next_ + size, end_);
|
||||
next_ += size;
|
||||
return result;
|
||||
}
|
||||
|
||||
int32_t EhFrameIterator::GetNextSLeb128() {
|
||||
int size = 0;
|
||||
int32_t result = DecodeSLeb128(next_, &size);
|
||||
DCHECK_LE(next_ + size, end_);
|
||||
next_ += size;
|
||||
return result;
|
||||
}
|
||||
|
||||
// static
|
||||
uint32_t EhFrameIterator::DecodeULeb128(const byte* encoded,
|
||||
int* encoded_size) {
|
||||
const byte* current = encoded;
|
||||
uint32_t result = 0;
|
||||
int shift = 0;
|
||||
|
||||
do {
|
||||
DCHECK_LT(shift, 8 * static_cast<int>(sizeof(result)));
|
||||
result |= (*current & 0x7f) << shift;
|
||||
shift += 7;
|
||||
} while (*current++ >= 128);
|
||||
|
||||
DCHECK_NOT_NULL(encoded_size);
|
||||
*encoded_size = static_cast<int>(current - encoded);
|
||||
|
||||
return result;
|
||||
}
|
||||
|
||||
// static
|
||||
int32_t EhFrameIterator::DecodeSLeb128(const byte* encoded, int* encoded_size) {
|
||||
static const byte kSignBitMask = 0x40;
|
||||
|
||||
const byte* current = encoded;
|
||||
int32_t result = 0;
|
||||
int shift = 0;
|
||||
byte chunk;
|
||||
|
||||
do {
|
||||
chunk = *current++;
|
||||
DCHECK_LT(shift, 8 * static_cast<int>(sizeof(result)));
|
||||
result |= (chunk & 0x7f) << shift;
|
||||
shift += 7;
|
||||
} while (chunk >= 128);
|
||||
|
||||
// Sign extend the result if the last chunk has the sign bit set.
|
||||
if (chunk & kSignBitMask) result |= (~0ull) << shift;
|
||||
|
||||
DCHECK_NOT_NULL(encoded_size);
|
||||
*encoded_size = static_cast<int>(current - encoded);
|
||||
|
||||
return result;
|
||||
}
|
||||
|
||||
#ifdef ENABLE_DISASSEMBLER
|
||||
|
||||
namespace {
|
||||
|
||||
class StreamModifiersScope final {
|
||||
public:
|
||||
explicit StreamModifiersScope(std::ostream* stream)
|
||||
: stream_(stream), flags_(stream->flags()) {}
|
||||
~StreamModifiersScope() { stream_->flags(flags_); }
|
||||
|
||||
private:
|
||||
std::ostream* stream_;
|
||||
std::ios::fmtflags flags_;
|
||||
};
|
||||
|
||||
} // namespace
|
||||
|
||||
// static
|
||||
void EhFrameDisassembler::DumpDwarfDirectives(std::ostream& stream, // NOLINT
|
||||
const byte* start,
|
||||
const byte* end) {
|
||||
StreamModifiersScope modifiers_scope(&stream);
|
||||
|
||||
EhFrameIterator eh_frame_iterator(start, end);
|
||||
uint32_t offset_in_procedure = 0;
|
||||
|
||||
while (!eh_frame_iterator.Done()) {
|
||||
stream << eh_frame_iterator.current_address() << " ";
|
||||
|
||||
byte bytecode = eh_frame_iterator.GetNextByte();
|
||||
|
||||
if (((bytecode >> EhFrameConstants::kLocationMaskSize) & 0xff) ==
|
||||
EhFrameConstants::kLocationTag) {
|
||||
int value = (bytecode & EhFrameConstants::kLocationMask) *
|
||||
EhFrameConstants::kCodeAlignmentFactor;
|
||||
offset_in_procedure += value;
|
||||
stream << "| pc_offset=" << offset_in_procedure << " (delta=" << value
|
||||
<< ")\n";
|
||||
continue;
|
||||
}
|
||||
|
||||
if (((bytecode >> EhFrameConstants::kSavedRegisterMaskSize) & 0xff) ==
|
||||
EhFrameConstants::kSavedRegisterTag) {
|
||||
uint32_t decoded_offset = eh_frame_iterator.GetNextULeb128();
|
||||
stream << "| " << DwarfRegisterCodeToString(
|
||||
bytecode & EhFrameConstants::kLocationMask)
|
||||
<< " saved at base" << std::showpos
|
||||
<< decoded_offset * EhFrameConstants::kDataAlignmentFactor
|
||||
<< std::noshowpos << '\n';
|
||||
continue;
|
||||
}
|
||||
|
||||
if (((bytecode >> EhFrameConstants::kFollowInitialRuleMaskSize) & 0xff) ==
|
||||
EhFrameConstants::kFollowInitialRuleTag) {
|
||||
stream << "| " << DwarfRegisterCodeToString(
|
||||
bytecode & EhFrameConstants::kLocationMask)
|
||||
<< " follows rule in CIE\n";
|
||||
continue;
|
||||
}
|
||||
|
||||
switch (static_cast<EhFrameConstants::DwarfOpcodes>(bytecode)) {
|
||||
case EhFrameConstants::DwarfOpcodes::kOffsetExtendedSf: {
|
||||
stream << "| "
|
||||
<< DwarfRegisterCodeToString(eh_frame_iterator.GetNextULeb128());
|
||||
int32_t decoded_offset = eh_frame_iterator.GetNextSLeb128();
|
||||
stream << " saved at base" << std::showpos
|
||||
<< decoded_offset * EhFrameConstants::kDataAlignmentFactor
|
||||
<< std::noshowpos << '\n';
|
||||
break;
|
||||
}
|
||||
case EhFrameConstants::DwarfOpcodes::kAdvanceLoc1: {
|
||||
int value = eh_frame_iterator.GetNextByte() *
|
||||
EhFrameConstants::kCodeAlignmentFactor;
|
||||
offset_in_procedure += value;
|
||||
stream << "| pc_offset=" << offset_in_procedure << " (delta=" << value
|
||||
<< ")\n";
|
||||
break;
|
||||
}
|
||||
case EhFrameConstants::DwarfOpcodes::kAdvanceLoc2: {
|
||||
int value = eh_frame_iterator.GetNextUInt16() *
|
||||
EhFrameConstants::kCodeAlignmentFactor;
|
||||
offset_in_procedure += value;
|
||||
stream << "| pc_offset=" << offset_in_procedure << " (delta=" << value
|
||||
<< ")\n";
|
||||
break;
|
||||
}
|
||||
case EhFrameConstants::DwarfOpcodes::kAdvanceLoc4: {
|
||||
int value = eh_frame_iterator.GetNextUInt32() *
|
||||
EhFrameConstants::kCodeAlignmentFactor;
|
||||
offset_in_procedure += value;
|
||||
stream << "| pc_offset=" << offset_in_procedure << " (delta=" << value
|
||||
<< ")\n";
|
||||
break;
|
||||
}
|
||||
case EhFrameConstants::DwarfOpcodes::kDefCfa: {
|
||||
uint32_t base_register = eh_frame_iterator.GetNextULeb128();
|
||||
uint32_t base_offset = eh_frame_iterator.GetNextULeb128();
|
||||
stream << "| base_register=" << DwarfRegisterCodeToString(base_register)
|
||||
<< ", base_offset=" << base_offset << '\n';
|
||||
break;
|
||||
}
|
||||
case EhFrameConstants::DwarfOpcodes::kDefCfaOffset: {
|
||||
stream << "| base_offset=" << eh_frame_iterator.GetNextULeb128()
|
||||
<< '\n';
|
||||
break;
|
||||
}
|
||||
case EhFrameConstants::DwarfOpcodes::kDefCfaRegister: {
|
||||
stream << "| base_register="
|
||||
<< DwarfRegisterCodeToString(eh_frame_iterator.GetNextULeb128())
|
||||
<< '\n';
|
||||
break;
|
||||
}
|
||||
case EhFrameConstants::DwarfOpcodes::kSameValue: {
|
||||
stream << "| "
|
||||
<< DwarfRegisterCodeToString(eh_frame_iterator.GetNextULeb128())
|
||||
<< " not modified from previous frame\n";
|
||||
break;
|
||||
}
|
||||
case EhFrameConstants::DwarfOpcodes::kNop:
|
||||
stream << "| nop\n";
|
||||
break;
|
||||
default:
|
||||
UNREACHABLE();
|
||||
return;
|
||||
}
|
||||
}
|
||||
}
|
||||
|
||||
void EhFrameDisassembler::DisassembleToStream(std::ostream& stream) { // NOLINT
|
||||
// The encoded CIE size does not include the size field itself.
|
||||
const int cie_size = ReadUnalignedUInt32(start_) + kInt32Size;
|
||||
const int fde_offset = cie_size;
|
||||
|
||||
const byte* cie_directives_start =
|
||||
start_ + EhFrameConstants::kInitialStateOffsetInCie;
|
||||
const byte* cie_directives_end = start_ + cie_size;
|
||||
DCHECK_LE(cie_directives_start, cie_directives_end);
|
||||
|
||||
stream << reinterpret_cast<const void*>(start_) << " .eh_frame: CIE\n";
|
||||
DumpDwarfDirectives(stream, cie_directives_start, cie_directives_end);
|
||||
|
||||
const byte* procedure_offset_address =
|
||||
start_ + fde_offset + EhFrameConstants::kProcedureAddressOffsetInFde;
|
||||
int32_t procedure_offset =
|
||||
ReadUnalignedValue<int32_t>(procedure_offset_address);
|
||||
|
||||
const byte* procedure_size_address =
|
||||
start_ + fde_offset + EhFrameConstants::kProcedureSizeOffsetInFde;
|
||||
uint32_t procedure_size = ReadUnalignedUInt32(procedure_size_address);
|
||||
|
||||
const byte* fde_start = start_ + fde_offset;
|
||||
stream << reinterpret_cast<const void*>(fde_start) << " .eh_frame: FDE\n"
|
||||
<< reinterpret_cast<const void*>(procedure_offset_address)
|
||||
<< " | procedure_offset=" << procedure_offset << '\n'
|
||||
<< reinterpret_cast<const void*>(procedure_size_address)
|
||||
<< " | procedure_size=" << procedure_size << '\n';
|
||||
|
||||
const int fde_directives_offset = fde_offset + 4 * kInt32Size + 1;
|
||||
|
||||
const byte* fde_directives_start = start_ + fde_directives_offset;
|
||||
const byte* fde_directives_end = end_ - EhFrameConstants::kEhFrameHdrSize -
|
||||
EhFrameConstants::kEhFrameTerminatorSize;
|
||||
DCHECK_LE(fde_directives_start, fde_directives_end);
|
||||
|
||||
DumpDwarfDirectives(stream, fde_directives_start, fde_directives_end);
|
||||
|
||||
const byte* fde_terminator_start = fde_directives_end;
|
||||
stream << reinterpret_cast<const void*>(fde_terminator_start)
|
||||
<< " .eh_frame: terminator\n";
|
||||
|
||||
const byte* eh_frame_hdr_start =
|
||||
fde_terminator_start + EhFrameConstants::kEhFrameTerminatorSize;
|
||||
stream << reinterpret_cast<const void*>(eh_frame_hdr_start)
|
||||
<< " .eh_frame_hdr\n";
|
||||
}
|
||||
|
||||
#endif
|
||||
|
||||
} // namespace internal
|
||||
} // namespace v8
|
||||
|
||||
294
src/eh-frame.h
294
src/eh-frame.h
@ -5,36 +5,292 @@
|
||||
#ifndef V8_EH_FRAME_H_
|
||||
#define V8_EH_FRAME_H_
|
||||
|
||||
#include <cstdint>
|
||||
#include "src/macro-assembler.h"
|
||||
|
||||
namespace v8 {
|
||||
namespace internal {
|
||||
|
||||
class Code;
|
||||
|
||||
class EhFrameHdr final {
|
||||
class EhFrameConstants final {
|
||||
public:
|
||||
static const int kRecordSize = 20;
|
||||
static const int kCIESize;
|
||||
enum class DwarfOpcodes : byte {
|
||||
kNop = 0x00,
|
||||
kAdvanceLoc1 = 0x02,
|
||||
kAdvanceLoc2 = 0x03,
|
||||
kAdvanceLoc4 = 0x04,
|
||||
kSameValue = 0x08,
|
||||
kDefCfa = 0x0c,
|
||||
kDefCfaRegister = 0x0d,
|
||||
kDefCfaOffset = 0x0e,
|
||||
kOffsetExtendedSf = 0x11,
|
||||
};
|
||||
|
||||
explicit EhFrameHdr(Code* code);
|
||||
enum DwarfEncodingSpecifiers : byte {
|
||||
kUData4 = 0x03,
|
||||
kSData4 = 0x0b,
|
||||
kPcRel = 0x10,
|
||||
kDataRel = 0x30,
|
||||
kOmit = 0xff,
|
||||
};
|
||||
|
||||
int32_t offset_to_eh_frame() const { return offset_to_eh_frame_; }
|
||||
uint32_t lut_entries_number() const { return lut_entries_number_; }
|
||||
int32_t offset_to_procedure() const { return offset_to_procedure_; }
|
||||
int32_t offset_to_fde() const { return offset_to_fde_; }
|
||||
static const int kLocationTag = 1;
|
||||
static const int kLocationMask = 0x3f;
|
||||
static const int kLocationMaskSize = 6;
|
||||
|
||||
static const int kSavedRegisterTag = 2;
|
||||
static const int kSavedRegisterMask = 0x3f;
|
||||
static const int kSavedRegisterMaskSize = 6;
|
||||
|
||||
static const int kFollowInitialRuleTag = 3;
|
||||
static const int kFollowInitialRuleMask = 0x3f;
|
||||
static const int kFollowInitialRuleMaskSize = 6;
|
||||
|
||||
static const int kProcedureAddressOffsetInFde = 2 * kInt32Size;
|
||||
static const int kProcedureSizeOffsetInFde = 3 * kInt32Size;
|
||||
|
||||
static const int kInitialStateOffsetInCie = 19;
|
||||
static const int kEhFrameTerminatorSize = 4;
|
||||
|
||||
// Defined in eh-writer-<arch>.cc
|
||||
static const int kCodeAlignmentFactor;
|
||||
static const int kDataAlignmentFactor;
|
||||
|
||||
static const int kFdeVersionSize = 1;
|
||||
static const int kFdeEncodingSpecifiersSize = 3;
|
||||
|
||||
static const int kEhFrameHdrVersion = 1;
|
||||
static const int kEhFrameHdrSize = 20;
|
||||
};
|
||||
|
||||
class EhFrameWriter {
|
||||
public:
|
||||
explicit EhFrameWriter(Zone* zone);
|
||||
|
||||
// The empty frame is a hack to trigger fp-based unwinding in Linux perf
|
||||
// compiled with libunwind support when processing DWARF-based call graphs.
|
||||
//
|
||||
// It is effectively a valid eh_frame_hdr with an empty look up table.
|
||||
//
|
||||
static void WriteEmptyEhFrame(std::ostream& stream); // NOLINT
|
||||
|
||||
// Write the CIE and FDE header. Call it before any other method.
|
||||
void Initialize();
|
||||
|
||||
void AdvanceLocation(int pc_offset);
|
||||
|
||||
// The <base_address> is the one to which all <offset>s in SaveRegisterToStack
|
||||
// directives are relative. It is given by <base_register> + <base_offset>.
|
||||
//
|
||||
// The <base_offset> must be positive or 0.
|
||||
//
|
||||
void SetBaseAddressRegister(Register base_register);
|
||||
void SetBaseAddressOffset(int base_offset);
|
||||
void IncreaseBaseAddressOffset(int base_delta) {
|
||||
SetBaseAddressOffset(base_offset_ + base_delta);
|
||||
}
|
||||
void SetBaseAddressRegisterAndOffset(Register base_register, int base_offset);
|
||||
|
||||
// Register saved at location <base_address> + <offset>.
|
||||
// The <offset> must be a multiple of EhFrameConstants::kDataAlignment.
|
||||
void RecordRegisterSavedToStack(Register name, int offset) {
|
||||
RecordRegisterSavedToStack(RegisterToDwarfCode(name), offset);
|
||||
}
|
||||
|
||||
// The register has not been modified from the previous frame.
|
||||
void RecordRegisterNotModified(Register name);
|
||||
|
||||
// The register follows the rule defined in the CIE.
|
||||
void RecordRegisterFollowsInitialRule(Register name);
|
||||
|
||||
void Finish(int code_size);
|
||||
|
||||
// Remember to call Finish() before GetEhFrame().
|
||||
//
|
||||
// The EhFrameWriter instance owns the buffer pointed by
|
||||
// CodeDesc::unwinding_info, and must outlive any use of the CodeDesc.
|
||||
//
|
||||
void GetEhFrame(CodeDesc* desc);
|
||||
|
||||
int last_pc_offset() const { return last_pc_offset_; }
|
||||
Register base_register() const { return base_register_; }
|
||||
int base_offset() const { return base_offset_; }
|
||||
|
||||
private:
|
||||
uint8_t version_;
|
||||
uint8_t eh_frame_ptr_encoding_;
|
||||
uint8_t lut_size_encoding_;
|
||||
uint8_t lut_entries_encoding_;
|
||||
int32_t offset_to_eh_frame_;
|
||||
uint32_t lut_entries_number_;
|
||||
int32_t offset_to_procedure_;
|
||||
int32_t offset_to_fde_;
|
||||
enum class InternalState { kUndefined, kInitialized, kFinalized };
|
||||
|
||||
static const uint32_t kInt32Placeholder = 0xdeadc0de;
|
||||
|
||||
void WriteSLeb128(int32_t value);
|
||||
void WriteULeb128(uint32_t value);
|
||||
|
||||
void WriteByte(byte value) { eh_frame_buffer_.push_back(value); }
|
||||
void WriteOpcode(EhFrameConstants::DwarfOpcodes opcode) {
|
||||
WriteByte(static_cast<byte>(opcode));
|
||||
}
|
||||
void WriteBytes(const byte* start, int size) {
|
||||
eh_frame_buffer_.insert(eh_frame_buffer_.end(), start, start + size);
|
||||
}
|
||||
void WriteInt16(uint16_t value) {
|
||||
WriteBytes(reinterpret_cast<const byte*>(&value), sizeof(value));
|
||||
}
|
||||
void WriteInt32(uint32_t value) {
|
||||
WriteBytes(reinterpret_cast<const byte*>(&value), sizeof(value));
|
||||
}
|
||||
void PatchInt32(int base_offset, uint32_t value) {
|
||||
DCHECK_EQ(ReadUnalignedUInt32(eh_frame_buffer_.data() + base_offset),
|
||||
kInt32Placeholder);
|
||||
DCHECK_LT(base_offset + kInt32Size, eh_frame_offset());
|
||||
WriteUnalignedUInt32(eh_frame_buffer_.data() + base_offset, value);
|
||||
}
|
||||
|
||||
// Write the common information entry, which includes encoding specifiers,
|
||||
// alignment factors, the return address (pseudo) register code and the
|
||||
// directives to construct the initial state of the unwinding table.
|
||||
void WriteCie();
|
||||
|
||||
// Write the header of the function data entry, containing a pointer to the
|
||||
// correspondent CIE and the position and size of the associated routine.
|
||||
void WriteFdeHeader();
|
||||
|
||||
// Write the contents of the .eh_frame_hdr section, including encoding
|
||||
// specifiers and the routine => FDE lookup table.
|
||||
void WriteEhFrameHdr(int code_size);
|
||||
|
||||
// Write nops to the buffer until the size reaches a multiple of 8 bytes.
|
||||
void WritePaddingTo8ByteAlignment();
|
||||
|
||||
// Internal version that directly accepts a DWARF register code, needed for
|
||||
// handling pseudo-registers on some platforms.
|
||||
void RecordRegisterSavedToStack(int register_code, int offset);
|
||||
|
||||
int GetProcedureAddressOffset() const {
|
||||
return fde_offset() + EhFrameConstants::kProcedureAddressOffsetInFde;
|
||||
}
|
||||
|
||||
int GetProcedureSizeOffset() const {
|
||||
return fde_offset() + EhFrameConstants::kProcedureSizeOffsetInFde;
|
||||
}
|
||||
|
||||
int eh_frame_offset() const {
|
||||
return static_cast<int>(eh_frame_buffer_.size());
|
||||
}
|
||||
|
||||
int fde_offset() const { return cie_size_; }
|
||||
|
||||
// Platform specific functions implemented in eh-frame-<arch>.cc
|
||||
|
||||
static int RegisterToDwarfCode(Register name);
|
||||
|
||||
// Write directives to build the initial state in the CIE.
|
||||
void WriteInitialStateInCie();
|
||||
|
||||
// Write the return address (pseudo) register code.
|
||||
void WriteReturnAddressRegisterCode();
|
||||
|
||||
int cie_size_;
|
||||
int last_pc_offset_;
|
||||
InternalState writer_state_;
|
||||
Register base_register_;
|
||||
int base_offset_;
|
||||
ZoneVector<byte> eh_frame_buffer_;
|
||||
|
||||
DISALLOW_COPY_AND_ASSIGN(EhFrameWriter);
|
||||
};
|
||||
|
||||
class EhFrameIterator {
|
||||
public:
|
||||
EhFrameIterator(const byte* start, const byte* end)
|
||||
: start_(start), next_(start), end_(end) {
|
||||
DCHECK_LE(start, end);
|
||||
}
|
||||
|
||||
void SkipCie() {
|
||||
DCHECK_EQ(next_, start_);
|
||||
next_ += ReadUnalignedUInt32(next_) + kInt32Size;
|
||||
}
|
||||
|
||||
void SkipToFdeDirectives() {
|
||||
SkipCie();
|
||||
// Skip the FDE header.
|
||||
Skip(kDirectivesOffsetInFde);
|
||||
}
|
||||
|
||||
void Skip(int how_many) {
|
||||
DCHECK_GE(how_many, 0);
|
||||
next_ += how_many;
|
||||
DCHECK_LE(next_, end_);
|
||||
}
|
||||
|
||||
uint32_t GetNextUInt32() { return GetNextValue<uint32_t>(); }
|
||||
uint16_t GetNextUInt16() { return GetNextValue<uint16_t>(); }
|
||||
byte GetNextByte() { return GetNextValue<byte>(); }
|
||||
EhFrameConstants::DwarfOpcodes GetNextOpcode() {
|
||||
return static_cast<EhFrameConstants::DwarfOpcodes>(GetNextByte());
|
||||
}
|
||||
|
||||
uint32_t GetNextULeb128();
|
||||
int32_t GetNextSLeb128();
|
||||
|
||||
bool Done() const {
|
||||
DCHECK_LE(next_, end_);
|
||||
return next_ == end_;
|
||||
}
|
||||
|
||||
int GetCurrentOffset() const {
|
||||
DCHECK_GE(next_, start_);
|
||||
return static_cast<int>(next_ - start_);
|
||||
}
|
||||
|
||||
int GetBufferSize() { return static_cast<int>(end_ - start_); }
|
||||
|
||||
const void* current_address() const {
|
||||
return reinterpret_cast<const void*>(next_);
|
||||
}
|
||||
|
||||
private:
|
||||
static const int kDirectivesOffsetInFde = 4 * kInt32Size + 1;
|
||||
|
||||
static uint32_t DecodeULeb128(const byte* encoded, int* encoded_size);
|
||||
static int32_t DecodeSLeb128(const byte* encoded, int* encoded_size);
|
||||
|
||||
template <typename T>
|
||||
T GetNextValue() {
|
||||
T result;
|
||||
DCHECK_LE(next_ + sizeof(result), end_);
|
||||
result = ReadUnalignedValue<T>(next_);
|
||||
next_ += sizeof(result);
|
||||
return result;
|
||||
}
|
||||
|
||||
const byte* start_;
|
||||
const byte* next_;
|
||||
const byte* end_;
|
||||
};
|
||||
|
||||
#ifdef ENABLE_DISASSEMBLER
|
||||
|
||||
class EhFrameDisassembler final {
|
||||
public:
|
||||
EhFrameDisassembler(const byte* start, const byte* end)
|
||||
: start_(start), end_(end) {
|
||||
DCHECK_LT(start, end);
|
||||
}
|
||||
|
||||
void DisassembleToStream(std::ostream& stream); // NOLINT
|
||||
|
||||
private:
|
||||
static void DumpDwarfDirectives(std::ostream& stream, // NOLINT
|
||||
const byte* start, const byte* end);
|
||||
|
||||
static const char* DwarfRegisterCodeToString(int code);
|
||||
|
||||
const byte* start_;
|
||||
const byte* end_;
|
||||
|
||||
DISALLOW_COPY_AND_ASSIGN(EhFrameDisassembler);
|
||||
};
|
||||
|
||||
#endif
|
||||
|
||||
} // namespace internal
|
||||
} // namespace v8
|
||||
|
||||
|
||||
@ -54,7 +54,7 @@ bool FullCodeGenerator::MakeCode(CompilationInfo* info) {
|
||||
}
|
||||
unsigned table_offset = cgen.EmitBackEdgeTable();
|
||||
|
||||
Handle<Code> code = CodeGenerator::MakeCodeEpilogue(&masm, info);
|
||||
Handle<Code> code = CodeGenerator::MakeCodeEpilogue(&masm, nullptr, info);
|
||||
cgen.PopulateDeoptimizationData(code);
|
||||
cgen.PopulateTypeFeedbackInfo(code);
|
||||
cgen.PopulateHandlerTable(code);
|
||||
|
||||
@ -61,6 +61,7 @@
|
||||
#ifdef ENABLE_DISASSEMBLER
|
||||
#include "src/disasm.h"
|
||||
#include "src/disassembler.h"
|
||||
#include "src/eh-frame.h"
|
||||
#endif
|
||||
|
||||
namespace v8 {
|
||||
@ -14372,6 +14373,14 @@ void Code::Disassemble(const char* name, std::ostream& os) { // NOLINT
|
||||
it.rinfo()->Print(GetIsolate(), os);
|
||||
}
|
||||
os << "\n";
|
||||
|
||||
if (has_unwinding_info()) {
|
||||
os << "UnwindingInfo (size = " << unwinding_info_size() << ")\n";
|
||||
EhFrameDisassembler eh_frame_disassembler(unwinding_info_start(),
|
||||
unwinding_info_end());
|
||||
eh_frame_disassembler.DisassembleToStream(os);
|
||||
os << "\n";
|
||||
}
|
||||
}
|
||||
#endif // ENABLE_DISASSEMBLER
|
||||
|
||||
|
||||
@ -324,18 +324,16 @@ void PerfJitLogger::LogWriteDebugInfo(Code* code, SharedFunctionInfo* shared) {
|
||||
}
|
||||
|
||||
void PerfJitLogger::LogWriteUnwindingInfo(Code* code) {
|
||||
EhFrameHdr eh_frame_hdr(code);
|
||||
|
||||
PerfJitCodeUnwindingInfo unwinding_info_header;
|
||||
unwinding_info_header.event_ = PerfJitCodeLoad::kUnwindingInfo;
|
||||
unwinding_info_header.time_stamp_ = GetTimestamp();
|
||||
unwinding_info_header.eh_frame_hdr_size_ = EhFrameHdr::kRecordSize;
|
||||
unwinding_info_header.eh_frame_hdr_size_ = EhFrameConstants::kEhFrameHdrSize;
|
||||
|
||||
if (code->has_unwinding_info()) {
|
||||
unwinding_info_header.unwinding_size_ = code->unwinding_info_size();
|
||||
unwinding_info_header.mapped_size_ = unwinding_info_header.unwinding_size_;
|
||||
} else {
|
||||
unwinding_info_header.unwinding_size_ = EhFrameHdr::kRecordSize;
|
||||
unwinding_info_header.unwinding_size_ = EhFrameConstants::kEhFrameHdrSize;
|
||||
unwinding_info_header.mapped_size_ = 0;
|
||||
}
|
||||
|
||||
@ -348,16 +346,13 @@ void PerfJitLogger::LogWriteUnwindingInfo(Code* code) {
|
||||
sizeof(unwinding_info_header));
|
||||
|
||||
if (code->has_unwinding_info()) {
|
||||
// The last EhFrameHdr::kRecordSize bytes were a placeholder for the header.
|
||||
// Discard them and write the actual eh_frame_hdr (below).
|
||||
DCHECK_GE(code->unwinding_info_size(), EhFrameHdr::kRecordSize);
|
||||
LogWriteBytes(reinterpret_cast<const char*>(code->unwinding_info_start()),
|
||||
code->unwinding_info_size() - EhFrameHdr::kRecordSize);
|
||||
code->unwinding_info_size());
|
||||
} else {
|
||||
OFStream perf_output_stream(perf_output_handle_);
|
||||
EhFrameWriter::WriteEmptyEhFrame(perf_output_stream);
|
||||
}
|
||||
|
||||
LogWriteBytes(reinterpret_cast<const char*>(&eh_frame_hdr),
|
||||
EhFrameHdr::kRecordSize);
|
||||
|
||||
char padding_bytes[] = "\0\0\0\0\0\0\0\0";
|
||||
DCHECK_LT(padding_size, sizeof(padding_bytes));
|
||||
LogWriteBytes(padding_bytes, padding_size);
|
||||
|
||||
@ -1231,6 +1231,7 @@
|
||||
'arm/macro-assembler-arm.h',
|
||||
'arm/simulator-arm.cc',
|
||||
'arm/simulator-arm.h',
|
||||
'arm/eh-frame-arm.cc',
|
||||
'compiler/arm/code-generator-arm.cc',
|
||||
'compiler/arm/instruction-codes-arm.h',
|
||||
'compiler/arm/instruction-scheduler-arm.cc',
|
||||
@ -1285,6 +1286,7 @@
|
||||
'arm64/simulator-arm64.h',
|
||||
'arm64/utils-arm64.cc',
|
||||
'arm64/utils-arm64.h',
|
||||
'arm64/eh-frame-arm64.cc',
|
||||
'compiler/arm64/code-generator-arm64.cc',
|
||||
'compiler/arm64/instruction-codes-arm64.h',
|
||||
'compiler/arm64/instruction-scheduler-arm64.cc',
|
||||
@ -1514,6 +1516,7 @@
|
||||
'compiler/x64/instruction-codes-x64.h',
|
||||
'compiler/x64/instruction-scheduler-x64.cc',
|
||||
'compiler/x64/instruction-selector-x64.cc',
|
||||
'x64/eh-frame-x64.cc',
|
||||
],
|
||||
}],
|
||||
['v8_target_arch=="ppc" or v8_target_arch=="ppc64"', {
|
||||
|
||||
66
src/x64/eh-frame-x64.cc
Normal file
66
src/x64/eh-frame-x64.cc
Normal file
@ -0,0 +1,66 @@
|
||||
// Copyright 2016 the V8 project authors. All rights reserved.
|
||||
// Use of this source code is governed by a BSD-style license that can be
|
||||
// found in the LICENSE file.
|
||||
|
||||
#include "src/eh-frame.h"
|
||||
|
||||
namespace v8 {
|
||||
namespace internal {
|
||||
|
||||
static const int kRaxDwarfCode = 0;
|
||||
static const int kRbpDwarfCode = 6;
|
||||
static const int kRspDwarfCode = 7;
|
||||
static const int kRipDwarfCode = 16;
|
||||
|
||||
STATIC_CONST_MEMBER_DEFINITION const int
|
||||
EhFrameConstants::kCodeAlignmentFactor = 1;
|
||||
|
||||
STATIC_CONST_MEMBER_DEFINITION const int
|
||||
EhFrameConstants::kDataAlignmentFactor = -8;
|
||||
|
||||
void EhFrameWriter::WriteReturnAddressRegisterCode() {
|
||||
WriteULeb128(kRipDwarfCode);
|
||||
}
|
||||
|
||||
void EhFrameWriter::WriteInitialStateInCie() {
|
||||
SetBaseAddressRegisterAndOffset(rsp, kPointerSize);
|
||||
// x64 rip (r16) has no Register instance associated.
|
||||
RecordRegisterSavedToStack(kRipDwarfCode, -kPointerSize);
|
||||
}
|
||||
|
||||
// static
|
||||
int EhFrameWriter::RegisterToDwarfCode(Register name) {
|
||||
switch (name.code()) {
|
||||
case Register::kCode_rbp:
|
||||
return kRbpDwarfCode;
|
||||
case Register::kCode_rsp:
|
||||
return kRspDwarfCode;
|
||||
case Register::kCode_rax:
|
||||
return kRaxDwarfCode;
|
||||
default:
|
||||
UNIMPLEMENTED();
|
||||
return -1;
|
||||
}
|
||||
}
|
||||
|
||||
#ifdef ENABLE_DISASSEMBLER
|
||||
|
||||
// static
|
||||
const char* EhFrameDisassembler::DwarfRegisterCodeToString(int code) {
|
||||
switch (code) {
|
||||
case kRbpDwarfCode:
|
||||
return "rbp";
|
||||
case kRspDwarfCode:
|
||||
return "rsp";
|
||||
case kRipDwarfCode:
|
||||
return "rip";
|
||||
default:
|
||||
UNIMPLEMENTED();
|
||||
return nullptr;
|
||||
}
|
||||
}
|
||||
|
||||
#endif
|
||||
|
||||
} // namespace internal
|
||||
} // namespace v8
|
||||
@ -138,7 +138,6 @@
|
||||
'test-double.cc',
|
||||
'test-dtoa.cc',
|
||||
'test-elements-kind.cc',
|
||||
'test-eh-frame-hdr.cc',
|
||||
'test-fast-dtoa.cc',
|
||||
'test-feedback-vector.cc',
|
||||
'test-field-type-tracking.cc',
|
||||
|
||||
@ -1,100 +0,0 @@
|
||||
// Copyright 2016 the V8 project authors. All rights reserved.
|
||||
// Use of this source code is governed by a BSD-style license that can be
|
||||
// found in the LICENSE file.
|
||||
|
||||
#include "src/eh-frame.h"
|
||||
#include "src/objects.h"
|
||||
#include "test/cctest/cctest.h"
|
||||
|
||||
using namespace v8::internal;
|
||||
|
||||
TEST(EhFrameHdr) {
|
||||
CcTest::InitializeVM();
|
||||
HandleScope handle_scope(CcTest::i_isolate());
|
||||
|
||||
// The content is not relevant in this test
|
||||
byte buffer[10] = {0};
|
||||
byte unwinding_info[30 + EhFrameHdr::kRecordSize] = {0};
|
||||
|
||||
CodeDesc code_desc;
|
||||
code_desc.buffer = &buffer[0];
|
||||
code_desc.buffer_size = sizeof(buffer);
|
||||
code_desc.constant_pool_size = 0;
|
||||
code_desc.instr_size = sizeof(buffer);
|
||||
code_desc.reloc_size = 0;
|
||||
code_desc.origin = nullptr;
|
||||
code_desc.unwinding_info = &unwinding_info[0];
|
||||
code_desc.unwinding_info_size = sizeof(unwinding_info);
|
||||
|
||||
Handle<Code> code = CcTest::i_isolate()->factory()->NewCode(
|
||||
code_desc, 0, Handle<Object>::null());
|
||||
|
||||
EhFrameHdr eh_frame_hdr(*code);
|
||||
CHECK_EQ(eh_frame_hdr.lut_entries_number(), 1);
|
||||
|
||||
//
|
||||
// Plugging some numbers in the DSO layout shown in eh-frame.cc:
|
||||
//
|
||||
// | ... |
|
||||
// +---------------+ <-- (E) --------
|
||||
// | | ^
|
||||
// | Instructions | 10 bytes | .text
|
||||
// | | v
|
||||
// +---------------+ <---------------
|
||||
// |///////////////|
|
||||
// |////Padding////| 6 bytes
|
||||
// |///////////////|
|
||||
// +---------------+ <---(D)---------
|
||||
// | | ^
|
||||
// | CIE | N bytes* |
|
||||
// | | |
|
||||
// +---------------+ <-- (C) | .eh_frame
|
||||
// | | |
|
||||
// | FDE | 30 - N bytes |
|
||||
// | | v
|
||||
// +---------------+ <-- (B) --------
|
||||
// | version | ^
|
||||
// +---------------+ 4 bytes |
|
||||
// | encoding | |
|
||||
// | specifiers | |
|
||||
// +---------------+ <---(A) | .eh_frame_hdr
|
||||
// | offset to | |
|
||||
// | .eh_frame | |
|
||||
// +---------------+ |
|
||||
// | ... | ...
|
||||
//
|
||||
// (*) the size of the CIE is platform dependent.
|
||||
//
|
||||
CHECK_EQ(eh_frame_hdr.offset_to_eh_frame(), -(4 + 30)); // A -> D
|
||||
CHECK_EQ(eh_frame_hdr.offset_to_procedure(), -(30 + 6 + 10)); // B -> E
|
||||
CHECK_EQ(eh_frame_hdr.offset_to_fde(),
|
||||
-(30 - EhFrameHdr::kCIESize)); // B -> C
|
||||
}
|
||||
|
||||
TEST(DummyEhFrameHdr) {
|
||||
CcTest::InitializeVM();
|
||||
HandleScope handle_scope(CcTest::i_isolate());
|
||||
|
||||
byte buffer[10] = {0}; // The content is not relevant in this test
|
||||
|
||||
CodeDesc code_desc;
|
||||
code_desc.buffer = &buffer[0];
|
||||
code_desc.buffer_size = sizeof(buffer);
|
||||
code_desc.constant_pool_size = 0;
|
||||
code_desc.instr_size = sizeof(buffer);
|
||||
code_desc.reloc_size = 0;
|
||||
code_desc.origin = nullptr;
|
||||
code_desc.unwinding_info = nullptr;
|
||||
code_desc.unwinding_info_size = 0;
|
||||
|
||||
Handle<Code> code = CcTest::i_isolate()->factory()->NewCode(
|
||||
code_desc, 0, Handle<Object>::null());
|
||||
|
||||
EhFrameHdr eh_frame_hdr(*code);
|
||||
// A dummy header has an empty LUT
|
||||
CHECK_EQ(eh_frame_hdr.lut_entries_number(), 0);
|
||||
// These values should be irrelevant, but check that they have been zeroed.
|
||||
CHECK_EQ(eh_frame_hdr.offset_to_eh_frame(), 0);
|
||||
CHECK_EQ(eh_frame_hdr.offset_to_procedure(), 0);
|
||||
CHECK_EQ(eh_frame_hdr.offset_to_fde(), 0);
|
||||
}
|
||||
61
test/unittests/eh-frame-iterator-unittest.cc
Normal file
61
test/unittests/eh-frame-iterator-unittest.cc
Normal file
@ -0,0 +1,61 @@
|
||||
// Copyright 2016 the V8 project authors. All rights reserved.
|
||||
// Use of this source code is governed by a BSD-style license that can be
|
||||
// found in the LICENSE file.
|
||||
|
||||
#include "src/eh-frame.h"
|
||||
#include "testing/gtest/include/gtest/gtest.h"
|
||||
|
||||
// Test enabled only on supported architectures.
|
||||
#if defined(V8_TARGET_ARCH_X64) || defined(V8_TARGET_ARCH_ARM) || \
|
||||
defined(V8_TARGET_ARCH_ARM64)
|
||||
|
||||
using namespace v8::internal;
|
||||
|
||||
namespace {
|
||||
|
||||
class EhFrameIteratorTest : public testing::Test {};
|
||||
|
||||
} // namespace
|
||||
|
||||
TEST_F(EhFrameIteratorTest, Values) {
|
||||
// Assuming little endian.
|
||||
static const byte kEncoded[] = {0xde, 0xc0, 0xad, 0xde, 0xef, 0xbe, 0xff};
|
||||
EhFrameIterator iterator(&kEncoded[0], &kEncoded[0] + sizeof(kEncoded));
|
||||
EXPECT_EQ(0xdeadc0de, iterator.GetNextUInt32());
|
||||
EXPECT_EQ(0xbeef, iterator.GetNextUInt16());
|
||||
EXPECT_EQ(0xff, iterator.GetNextByte());
|
||||
EXPECT_TRUE(iterator.Done());
|
||||
}
|
||||
|
||||
TEST_F(EhFrameIteratorTest, Skip) {
|
||||
static const byte kEncoded[] = {0xde, 0xad, 0xc0, 0xde};
|
||||
EhFrameIterator iterator(&kEncoded[0], &kEncoded[0] + sizeof(kEncoded));
|
||||
iterator.Skip(2);
|
||||
EXPECT_EQ(2, iterator.GetCurrentOffset());
|
||||
EXPECT_EQ(0xc0, iterator.GetNextByte());
|
||||
iterator.Skip(1);
|
||||
EXPECT_TRUE(iterator.Done());
|
||||
}
|
||||
|
||||
TEST_F(EhFrameIteratorTest, ULEB128Decoding) {
|
||||
static const byte kEncoded[] = {0xe5, 0x8e, 0x26};
|
||||
EhFrameIterator iterator(&kEncoded[0], &kEncoded[0] + sizeof(kEncoded));
|
||||
EXPECT_EQ(624485, iterator.GetNextULeb128());
|
||||
EXPECT_TRUE(iterator.Done());
|
||||
}
|
||||
|
||||
TEST_F(EhFrameIteratorTest, SLEB128DecodingPositive) {
|
||||
static const byte kEncoded[] = {0xe5, 0x8e, 0x26};
|
||||
EhFrameIterator iterator(&kEncoded[0], &kEncoded[0] + sizeof(kEncoded));
|
||||
EXPECT_EQ(624485, iterator.GetNextSLeb128());
|
||||
EXPECT_TRUE(iterator.Done());
|
||||
}
|
||||
|
||||
TEST_F(EhFrameIteratorTest, SLEB128DecodingNegative) {
|
||||
static const byte kEncoded[] = {0x9b, 0xf1, 0x59};
|
||||
EhFrameIterator iterator(&kEncoded[0], &kEncoded[0] + sizeof(kEncoded));
|
||||
EXPECT_EQ(-624485, iterator.GetNextSLeb128());
|
||||
EXPECT_TRUE(iterator.Done());
|
||||
}
|
||||
|
||||
#endif
|
||||
464
test/unittests/eh-frame-writer-unittest.cc
Normal file
464
test/unittests/eh-frame-writer-unittest.cc
Normal file
@ -0,0 +1,464 @@
|
||||
// Copyright 2016 the V8 project authors. All rights reserved.
|
||||
// Use of this source code is governed by a BSD-style license that can be
|
||||
// found in the LICENSE file.
|
||||
|
||||
#include "src/eh-frame.h"
|
||||
#include "test/unittests/test-utils.h"
|
||||
|
||||
// Test enabled only on supported architectures.
|
||||
#if defined(V8_TARGET_ARCH_X64) || defined(V8_TARGET_ARCH_ARM) || \
|
||||
defined(V8_TARGET_ARCH_ARM64)
|
||||
|
||||
using namespace v8::internal;
|
||||
|
||||
namespace {
|
||||
|
||||
class EhFrameWriterTest : public TestWithZone {
|
||||
protected:
|
||||
// Being a 7bit positive integer, this also serves as its ULEB128 encoding.
|
||||
static const int kTestRegisterCode = 0;
|
||||
|
||||
static EhFrameIterator MakeIterator(EhFrameWriter* writer) {
|
||||
CodeDesc desc;
|
||||
writer->GetEhFrame(&desc);
|
||||
DCHECK_GT(desc.unwinding_info_size, 0);
|
||||
return EhFrameIterator(desc.unwinding_info,
|
||||
desc.unwinding_info + desc.unwinding_info_size);
|
||||
}
|
||||
};
|
||||
|
||||
const int EhFrameWriterTest::kTestRegisterCode;
|
||||
|
||||
} // namespace
|
||||
|
||||
TEST_F(EhFrameWriterTest, Alignment) {
|
||||
EhFrameWriter writer(zone());
|
||||
writer.Initialize();
|
||||
writer.AdvanceLocation(42 * EhFrameConstants::kCodeAlignmentFactor);
|
||||
writer.Finish(100);
|
||||
|
||||
EhFrameIterator iterator = MakeIterator(&writer);
|
||||
ASSERT_EQ(0, EhFrameConstants::kEhFrameHdrSize % 4);
|
||||
ASSERT_EQ(0, EhFrameConstants::kEhFrameTerminatorSize % 4);
|
||||
EXPECT_EQ(0, (iterator.GetBufferSize() - EhFrameConstants::kEhFrameHdrSize -
|
||||
EhFrameConstants::kEhFrameTerminatorSize) %
|
||||
8);
|
||||
}
|
||||
|
||||
TEST_F(EhFrameWriterTest, FDEHeader) {
|
||||
static const int kProcedureSize = 0x5678abcd;
|
||||
|
||||
EhFrameWriter writer(zone());
|
||||
writer.Initialize();
|
||||
writer.Finish(kProcedureSize);
|
||||
|
||||
EhFrameIterator iterator = MakeIterator(&writer);
|
||||
int cie_size = iterator.GetNextUInt32();
|
||||
iterator.Skip(cie_size);
|
||||
|
||||
int fde_size = iterator.GetNextUInt32();
|
||||
EXPECT_EQ(iterator.GetBufferSize(),
|
||||
fde_size + cie_size + EhFrameConstants::kEhFrameTerminatorSize +
|
||||
EhFrameConstants::kEhFrameHdrSize + 2 * kInt32Size);
|
||||
|
||||
int backwards_offset_to_cie_offset = iterator.GetCurrentOffset();
|
||||
int backwards_offset_to_cie = iterator.GetNextUInt32();
|
||||
EXPECT_EQ(backwards_offset_to_cie_offset, backwards_offset_to_cie);
|
||||
|
||||
int procedure_address_offset = iterator.GetCurrentOffset();
|
||||
int procedure_address = iterator.GetNextUInt32();
|
||||
EXPECT_EQ(-(procedure_address_offset + RoundUp(kProcedureSize, 8)),
|
||||
procedure_address);
|
||||
|
||||
int procedure_size = iterator.GetNextUInt32();
|
||||
EXPECT_EQ(kProcedureSize, procedure_size);
|
||||
}
|
||||
|
||||
TEST_F(EhFrameWriterTest, SetOffset) {
|
||||
static const int kOffset = 0x0badc0de;
|
||||
|
||||
EhFrameWriter writer(zone());
|
||||
writer.Initialize();
|
||||
writer.SetBaseAddressOffset(kOffset);
|
||||
writer.Finish(100);
|
||||
|
||||
EhFrameIterator iterator = MakeIterator(&writer);
|
||||
iterator.SkipToFdeDirectives();
|
||||
|
||||
EXPECT_EQ(EhFrameConstants::DwarfOpcodes::kDefCfaOffset,
|
||||
iterator.GetNextOpcode());
|
||||
EXPECT_EQ(kOffset, iterator.GetNextULeb128());
|
||||
}
|
||||
|
||||
TEST_F(EhFrameWriterTest, IncreaseOffset) {
|
||||
static const int kFirstOffset = 121;
|
||||
static const int kSecondOffset = 16;
|
||||
|
||||
EhFrameWriter writer(zone());
|
||||
writer.Initialize();
|
||||
writer.SetBaseAddressOffset(kFirstOffset);
|
||||
writer.IncreaseBaseAddressOffset(kSecondOffset);
|
||||
writer.Finish(100);
|
||||
|
||||
EhFrameIterator iterator = MakeIterator(&writer);
|
||||
iterator.SkipToFdeDirectives();
|
||||
|
||||
EXPECT_EQ(EhFrameConstants::DwarfOpcodes::kDefCfaOffset,
|
||||
iterator.GetNextOpcode());
|
||||
EXPECT_EQ(kFirstOffset, iterator.GetNextULeb128());
|
||||
|
||||
EXPECT_EQ(EhFrameConstants::DwarfOpcodes::kDefCfaOffset,
|
||||
iterator.GetNextOpcode());
|
||||
EXPECT_EQ(kFirstOffset + kSecondOffset, iterator.GetNextULeb128());
|
||||
}
|
||||
|
||||
TEST_F(EhFrameWriterTest, SetRegister) {
|
||||
Register test_register = Register::from_code(kTestRegisterCode);
|
||||
|
||||
EhFrameWriter writer(zone());
|
||||
writer.Initialize();
|
||||
writer.SetBaseAddressRegister(test_register);
|
||||
writer.Finish(100);
|
||||
|
||||
EhFrameIterator iterator = MakeIterator(&writer);
|
||||
iterator.SkipToFdeDirectives();
|
||||
|
||||
EXPECT_EQ(EhFrameConstants::DwarfOpcodes::kDefCfaRegister,
|
||||
iterator.GetNextOpcode());
|
||||
EXPECT_EQ(kTestRegisterCode, iterator.GetNextULeb128());
|
||||
}
|
||||
|
||||
TEST_F(EhFrameWriterTest, SetRegisterAndOffset) {
|
||||
Register test_register = Register::from_code(kTestRegisterCode);
|
||||
static const int kOffset = 0x0badc0de;
|
||||
|
||||
EhFrameWriter writer(zone());
|
||||
writer.Initialize();
|
||||
writer.SetBaseAddressRegisterAndOffset(test_register, kOffset);
|
||||
writer.Finish(100);
|
||||
|
||||
EhFrameIterator iterator = MakeIterator(&writer);
|
||||
iterator.SkipToFdeDirectives();
|
||||
|
||||
EXPECT_EQ(EhFrameConstants::DwarfOpcodes::kDefCfa, iterator.GetNextOpcode());
|
||||
EXPECT_EQ(kTestRegisterCode, iterator.GetNextULeb128());
|
||||
EXPECT_EQ(kOffset, iterator.GetNextULeb128());
|
||||
}
|
||||
|
||||
TEST_F(EhFrameWriterTest, PcOffsetEncoding6bit) {
|
||||
static const int kOffset = 42;
|
||||
|
||||
EhFrameWriter writer(zone());
|
||||
writer.Initialize();
|
||||
writer.AdvanceLocation(kOffset * EhFrameConstants::kCodeAlignmentFactor);
|
||||
writer.Finish(100);
|
||||
|
||||
EhFrameIterator iterator = MakeIterator(&writer);
|
||||
iterator.SkipToFdeDirectives();
|
||||
|
||||
EXPECT_EQ((1 << 6) | kOffset, iterator.GetNextByte());
|
||||
}
|
||||
|
||||
TEST_F(EhFrameWriterTest, PcOffsetEncoding6bitDelta) {
|
||||
static const int kFirstOffset = 42;
|
||||
static const int kSecondOffset = 62;
|
||||
|
||||
EhFrameWriter writer(zone());
|
||||
writer.Initialize();
|
||||
writer.AdvanceLocation(kFirstOffset * EhFrameConstants::kCodeAlignmentFactor);
|
||||
writer.AdvanceLocation(kSecondOffset *
|
||||
EhFrameConstants::kCodeAlignmentFactor);
|
||||
writer.Finish(100);
|
||||
|
||||
EhFrameIterator iterator = MakeIterator(&writer);
|
||||
iterator.SkipToFdeDirectives();
|
||||
|
||||
EXPECT_EQ((1 << 6) | kFirstOffset, iterator.GetNextByte());
|
||||
EXPECT_EQ((1 << 6) | (kSecondOffset - kFirstOffset), iterator.GetNextByte());
|
||||
}
|
||||
|
||||
TEST_F(EhFrameWriterTest, PcOffsetEncoding8bit) {
|
||||
static const int kOffset = 0x42;
|
||||
|
||||
EhFrameWriter writer(zone());
|
||||
writer.Initialize();
|
||||
writer.AdvanceLocation(kOffset * EhFrameConstants::kCodeAlignmentFactor);
|
||||
writer.Finish(100);
|
||||
|
||||
EhFrameIterator iterator = MakeIterator(&writer);
|
||||
iterator.SkipToFdeDirectives();
|
||||
|
||||
EXPECT_EQ(EhFrameConstants::DwarfOpcodes::kAdvanceLoc1,
|
||||
iterator.GetNextOpcode());
|
||||
EXPECT_EQ(kOffset, iterator.GetNextByte());
|
||||
}
|
||||
|
||||
TEST_F(EhFrameWriterTest, PcOffsetEncoding8bitDelta) {
|
||||
static const int kFirstOffset = 0x10;
|
||||
static const int kSecondOffset = 0x70;
|
||||
static const int kThirdOffset = 0xb5;
|
||||
|
||||
EhFrameWriter writer(zone());
|
||||
writer.Initialize();
|
||||
writer.AdvanceLocation(kFirstOffset * EhFrameConstants::kCodeAlignmentFactor);
|
||||
writer.AdvanceLocation(kSecondOffset *
|
||||
EhFrameConstants::kCodeAlignmentFactor);
|
||||
writer.AdvanceLocation(kThirdOffset * EhFrameConstants::kCodeAlignmentFactor);
|
||||
writer.Finish(100);
|
||||
|
||||
EhFrameIterator iterator = MakeIterator(&writer);
|
||||
iterator.SkipToFdeDirectives();
|
||||
|
||||
EXPECT_EQ((1 << 6) | kFirstOffset, iterator.GetNextByte());
|
||||
|
||||
EXPECT_EQ(EhFrameConstants::DwarfOpcodes::kAdvanceLoc1,
|
||||
iterator.GetNextOpcode());
|
||||
EXPECT_EQ(kSecondOffset - kFirstOffset, iterator.GetNextByte());
|
||||
|
||||
EXPECT_EQ(EhFrameConstants::DwarfOpcodes::kAdvanceLoc1,
|
||||
iterator.GetNextOpcode());
|
||||
EXPECT_EQ(kThirdOffset - kSecondOffset, iterator.GetNextByte());
|
||||
}
|
||||
|
||||
TEST_F(EhFrameWriterTest, PcOffsetEncoding16bit) {
|
||||
static const int kOffset = kMaxUInt8 + 42;
|
||||
ASSERT_LT(kOffset, kMaxUInt16);
|
||||
|
||||
EhFrameWriter writer(zone());
|
||||
writer.Initialize();
|
||||
writer.AdvanceLocation(kOffset * EhFrameConstants::kCodeAlignmentFactor);
|
||||
writer.Finish(100);
|
||||
|
||||
EhFrameIterator iterator = MakeIterator(&writer);
|
||||
iterator.SkipToFdeDirectives();
|
||||
|
||||
EXPECT_EQ(EhFrameConstants::DwarfOpcodes::kAdvanceLoc2,
|
||||
iterator.GetNextOpcode());
|
||||
EXPECT_EQ(kOffset, iterator.GetNextUInt16());
|
||||
}
|
||||
|
||||
TEST_F(EhFrameWriterTest, PcOffsetEncoding16bitDelta) {
|
||||
static const int kFirstOffset = 0x41;
|
||||
static const int kSecondOffset = kMaxUInt8 + 0x42;
|
||||
|
||||
EhFrameWriter writer(zone());
|
||||
writer.Initialize();
|
||||
writer.AdvanceLocation(kFirstOffset * EhFrameConstants::kCodeAlignmentFactor);
|
||||
writer.AdvanceLocation(kSecondOffset *
|
||||
EhFrameConstants::kCodeAlignmentFactor);
|
||||
writer.Finish(100);
|
||||
|
||||
EhFrameIterator iterator = MakeIterator(&writer);
|
||||
iterator.SkipToFdeDirectives();
|
||||
|
||||
EXPECT_EQ(EhFrameConstants::DwarfOpcodes::kAdvanceLoc1,
|
||||
iterator.GetNextOpcode());
|
||||
EXPECT_EQ(kFirstOffset, iterator.GetNextByte());
|
||||
|
||||
EXPECT_EQ(EhFrameConstants::DwarfOpcodes::kAdvanceLoc2,
|
||||
iterator.GetNextOpcode());
|
||||
EXPECT_EQ(kSecondOffset - kFirstOffset, iterator.GetNextUInt16());
|
||||
}
|
||||
|
||||
TEST_F(EhFrameWriterTest, PcOffsetEncoding32bit) {
|
||||
static const int kOffset = kMaxUInt16 + 42;
|
||||
|
||||
EhFrameWriter writer(zone());
|
||||
writer.Initialize();
|
||||
writer.AdvanceLocation(kOffset * EhFrameConstants::kCodeAlignmentFactor);
|
||||
writer.Finish(100);
|
||||
|
||||
EhFrameIterator iterator = MakeIterator(&writer);
|
||||
iterator.SkipToFdeDirectives();
|
||||
|
||||
EXPECT_EQ(EhFrameConstants::DwarfOpcodes::kAdvanceLoc4,
|
||||
iterator.GetNextOpcode());
|
||||
EXPECT_EQ(kOffset, iterator.GetNextUInt32());
|
||||
}
|
||||
|
||||
TEST_F(EhFrameWriterTest, PcOffsetEncoding32bitDelta) {
|
||||
static const int kFirstOffset = kMaxUInt16 + 0x42;
|
||||
static const int kSecondOffset = kMaxUInt16 + 0x67;
|
||||
|
||||
EhFrameWriter writer(zone());
|
||||
writer.Initialize();
|
||||
writer.AdvanceLocation(kFirstOffset * EhFrameConstants::kCodeAlignmentFactor);
|
||||
writer.AdvanceLocation(kSecondOffset *
|
||||
EhFrameConstants::kCodeAlignmentFactor);
|
||||
writer.Finish(100);
|
||||
|
||||
EhFrameIterator iterator = MakeIterator(&writer);
|
||||
iterator.SkipToFdeDirectives();
|
||||
|
||||
EXPECT_EQ(EhFrameConstants::DwarfOpcodes::kAdvanceLoc4,
|
||||
iterator.GetNextOpcode());
|
||||
EXPECT_EQ(kFirstOffset, iterator.GetNextUInt32());
|
||||
|
||||
EXPECT_EQ((1 << 6) | (kSecondOffset - kFirstOffset), iterator.GetNextByte());
|
||||
}
|
||||
|
||||
TEST_F(EhFrameWriterTest, SaveRegisterUnsignedOffset) {
|
||||
Register test_register = Register::from_code(kTestRegisterCode);
|
||||
static const int kOffset =
|
||||
EhFrameConstants::kDataAlignmentFactor > 0 ? 12344 : -12344;
|
||||
|
||||
EhFrameWriter writer(zone());
|
||||
writer.Initialize();
|
||||
writer.RecordRegisterSavedToStack(test_register, kOffset);
|
||||
writer.Finish(100);
|
||||
|
||||
EhFrameIterator iterator = MakeIterator(&writer);
|
||||
iterator.SkipToFdeDirectives();
|
||||
|
||||
EXPECT_EQ((2 << 6) | kTestRegisterCode, iterator.GetNextByte());
|
||||
EXPECT_EQ(kOffset / EhFrameConstants::kDataAlignmentFactor,
|
||||
iterator.GetNextULeb128());
|
||||
}
|
||||
|
||||
TEST_F(EhFrameWriterTest, SaveRegisterSignedOffset) {
|
||||
Register test_register = Register::from_code(kTestRegisterCode);
|
||||
static const int kOffset =
|
||||
EhFrameConstants::kDataAlignmentFactor < 0 ? 12344 : -12344;
|
||||
|
||||
ASSERT_EQ(kOffset % EhFrameConstants::kDataAlignmentFactor, 0);
|
||||
|
||||
EhFrameWriter writer(zone());
|
||||
writer.Initialize();
|
||||
writer.RecordRegisterSavedToStack(test_register, kOffset);
|
||||
writer.Finish(100);
|
||||
|
||||
EhFrameIterator iterator = MakeIterator(&writer);
|
||||
iterator.SkipToFdeDirectives();
|
||||
|
||||
EXPECT_EQ(EhFrameConstants::DwarfOpcodes::kOffsetExtendedSf,
|
||||
iterator.GetNextOpcode());
|
||||
EXPECT_EQ(kTestRegisterCode, iterator.GetNextULeb128());
|
||||
EXPECT_EQ(kOffset / EhFrameConstants::kDataAlignmentFactor,
|
||||
iterator.GetNextSLeb128());
|
||||
}
|
||||
|
||||
TEST_F(EhFrameWriterTest, RegisterNotModified) {
|
||||
Register test_register = Register::from_code(kTestRegisterCode);
|
||||
|
||||
EhFrameWriter writer(zone());
|
||||
writer.Initialize();
|
||||
writer.RecordRegisterNotModified(test_register);
|
||||
writer.Finish(100);
|
||||
|
||||
EhFrameIterator iterator = MakeIterator(&writer);
|
||||
iterator.SkipToFdeDirectives();
|
||||
|
||||
EXPECT_EQ(EhFrameConstants::DwarfOpcodes::kSameValue,
|
||||
iterator.GetNextOpcode());
|
||||
EXPECT_EQ(kTestRegisterCode, iterator.GetNextULeb128());
|
||||
}
|
||||
|
||||
TEST_F(EhFrameWriterTest, RegisterFollowsInitialRule) {
|
||||
Register test_register = Register::from_code(kTestRegisterCode);
|
||||
|
||||
EhFrameWriter writer(zone());
|
||||
writer.Initialize();
|
||||
writer.RecordRegisterFollowsInitialRule(test_register);
|
||||
writer.Finish(100);
|
||||
|
||||
EhFrameIterator iterator = MakeIterator(&writer);
|
||||
iterator.SkipToFdeDirectives();
|
||||
|
||||
EXPECT_EQ((3 << 6) | kTestRegisterCode, iterator.GetNextByte());
|
||||
}
|
||||
|
||||
TEST_F(EhFrameWriterTest, EhFrameHdrLayout) {
|
||||
static const int kCodeSize = 10;
|
||||
static const int kPaddingSize = 6;
|
||||
|
||||
EhFrameWriter writer(zone());
|
||||
writer.Initialize();
|
||||
writer.Finish(kCodeSize);
|
||||
|
||||
EhFrameIterator iterator = MakeIterator(&writer);
|
||||
|
||||
// Skip the .eh_frame.
|
||||
|
||||
int encoded_cie_size = iterator.GetNextUInt32();
|
||||
iterator.Skip(encoded_cie_size);
|
||||
int cie_size = encoded_cie_size + kInt32Size;
|
||||
|
||||
int encoded_fde_size = iterator.GetNextUInt32();
|
||||
iterator.Skip(encoded_fde_size);
|
||||
int fde_size = encoded_fde_size + kInt32Size;
|
||||
|
||||
iterator.Skip(EhFrameConstants::kEhFrameTerminatorSize);
|
||||
|
||||
int eh_frame_size =
|
||||
cie_size + fde_size + EhFrameConstants::kEhFrameTerminatorSize;
|
||||
|
||||
//
|
||||
// Plugging some numbers in the DSO layout shown in eh-frame.cc:
|
||||
//
|
||||
// | ... |
|
||||
// +---------------+ <-- (E) ---------
|
||||
// | | ^
|
||||
// | Instructions | 10 bytes | .text
|
||||
// | | v
|
||||
// +---------------+ <----------------
|
||||
// |///////////////|
|
||||
// |////Padding////| 6 bytes
|
||||
// |///////////////|
|
||||
// +---------------+ <---(D)----------
|
||||
// | | ^
|
||||
// | CIE | cie_size bytes* |
|
||||
// | | |
|
||||
// +---------------+ <-- (C) |
|
||||
// | | | .eh_frame
|
||||
// | FDE | fde_size bytes |
|
||||
// | | |
|
||||
// +---------------+ |
|
||||
// | terminator | 4 bytes v
|
||||
// +---------------+ <-- (B) ---------
|
||||
// | version | ^
|
||||
// +---------------+ 4 bytes |
|
||||
// | encoding | |
|
||||
// | specifiers | |
|
||||
// +---------------+ <---(A) | .eh_frame_hdr
|
||||
// | offset to | |
|
||||
// | .eh_frame | |
|
||||
// +---------------+ |
|
||||
// | ... | ...
|
||||
//
|
||||
// (*) the size of the CIE is platform dependent.
|
||||
//
|
||||
|
||||
int eh_frame_hdr_version = iterator.GetNextByte();
|
||||
EXPECT_EQ(EhFrameConstants::kEhFrameHdrVersion, eh_frame_hdr_version);
|
||||
|
||||
// .eh_frame pointer encoding specifier.
|
||||
EXPECT_EQ(EhFrameConstants::kSData4 | EhFrameConstants::kPcRel,
|
||||
iterator.GetNextByte());
|
||||
|
||||
// Lookup table size encoding specifier.
|
||||
EXPECT_EQ(EhFrameConstants::kUData4, iterator.GetNextByte());
|
||||
|
||||
// Lookup table pointers encoding specifier.
|
||||
EXPECT_EQ(EhFrameConstants::kSData4 | EhFrameConstants::kDataRel,
|
||||
iterator.GetNextByte());
|
||||
|
||||
// A -> D
|
||||
int offset_to_eh_frame = iterator.GetNextUInt32();
|
||||
EXPECT_EQ(-(EhFrameConstants::kFdeVersionSize +
|
||||
EhFrameConstants::kFdeEncodingSpecifiersSize + eh_frame_size),
|
||||
offset_to_eh_frame);
|
||||
|
||||
int lut_entries = iterator.GetNextUInt32();
|
||||
EXPECT_EQ(1, lut_entries);
|
||||
|
||||
// B -> E
|
||||
int offset_to_procedure = iterator.GetNextUInt32();
|
||||
EXPECT_EQ(-(eh_frame_size + kPaddingSize + kCodeSize), offset_to_procedure);
|
||||
|
||||
// B -> C
|
||||
int offset_to_fde = iterator.GetNextUInt32();
|
||||
EXPECT_EQ(-(fde_size + EhFrameConstants::kEhFrameTerminatorSize),
|
||||
offset_to_fde);
|
||||
}
|
||||
|
||||
#endif
|
||||
@ -79,6 +79,8 @@
|
||||
'compiler/value-numbering-reducer-unittest.cc',
|
||||
'compiler/zone-pool-unittest.cc',
|
||||
'counters-unittest.cc',
|
||||
'eh-frame-iterator-unittest.cc',
|
||||
'eh-frame-writer-unittest.cc',
|
||||
'interpreter/bytecodes-unittest.cc',
|
||||
'interpreter/bytecode-array-builder-unittest.cc',
|
||||
'interpreter/bytecode-array-iterator-unittest.cc',
|
||||
|
||||
Loading…
Reference in New Issue
Block a user