1b21067cf2
Previously when objcopy generated section headers, it padded the LEB that encodes the section size out to 5 bytes, matching the behavior of clang. This is correct, but results in a binary that differs from the input. This can sometimes have undesirable consequences (e.g. breaking source maps). This change makes the object reader remember the size of the LEB encoding in the section header, so that llvm-objcopy can reproduce it exactly. For sections not read from an object file (e.g. that llvm-objcopy is adding itself), pad to 5 bytes. Reviewed By: jhenderson Differential Revision: https://reviews.llvm.org/D155535
433 lines
15 KiB
C++
433 lines
15 KiB
C++
//===------ utils/wasm2yaml.cpp - obj2yaml conversion tool ------*- C++ -*-===//
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//
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// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
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// See https://llvm.org/LICENSE.txt for license information.
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// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
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//
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//===----------------------------------------------------------------------===//
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#include "obj2yaml.h"
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#include "llvm/Object/COFF.h"
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#include "llvm/ObjectYAML/WasmYAML.h"
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#include "llvm/Support/ErrorHandling.h"
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#include "llvm/Support/LEB128.h"
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#include "llvm/Support/YAMLTraits.h"
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using namespace llvm;
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using object::WasmSection;
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namespace {
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class WasmDumper {
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const object::WasmObjectFile &Obj;
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public:
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WasmDumper(const object::WasmObjectFile &O) : Obj(O) {}
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ErrorOr<WasmYAML::Object *> dump();
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std::unique_ptr<WasmYAML::CustomSection>
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dumpCustomSection(const WasmSection &WasmSec);
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};
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} // namespace
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static WasmYAML::Limits makeLimits(const wasm::WasmLimits &Limits) {
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WasmYAML::Limits L;
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L.Flags = Limits.Flags;
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L.Minimum = Limits.Minimum;
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L.Maximum = Limits.Maximum;
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return L;
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}
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static WasmYAML::Table makeTable(uint32_t Index,
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const wasm::WasmTableType &Type) {
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WasmYAML::Table T;
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T.Index = Index;
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T.ElemType = Type.ElemType;
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T.TableLimits = makeLimits(Type.Limits);
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return T;
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}
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std::unique_ptr<WasmYAML::CustomSection>
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WasmDumper::dumpCustomSection(const WasmSection &WasmSec) {
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std::unique_ptr<WasmYAML::CustomSection> CustomSec;
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if (WasmSec.Name == "dylink" || WasmSec.Name == "dylink.0") {
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std::unique_ptr<WasmYAML::DylinkSection> DylinkSec =
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std::make_unique<WasmYAML::DylinkSection>();
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const wasm::WasmDylinkInfo& Info = Obj.dylinkInfo();
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DylinkSec->MemorySize = Info.MemorySize;
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DylinkSec->MemoryAlignment = Info.MemoryAlignment;
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DylinkSec->TableSize = Info.TableSize;
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DylinkSec->TableAlignment = Info.TableAlignment;
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DylinkSec->Needed = Info.Needed;
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for (const auto &Imp : Info.ImportInfo)
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DylinkSec->ImportInfo.push_back({Imp.Module, Imp.Field, Imp.Flags});
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for (const auto &Exp : Info.ExportInfo)
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DylinkSec->ExportInfo.push_back({Exp.Name, Exp.Flags});
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CustomSec = std::move(DylinkSec);
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} else if (WasmSec.Name == "name") {
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std::unique_ptr<WasmYAML::NameSection> NameSec =
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std::make_unique<WasmYAML::NameSection>();
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for (const llvm::wasm::WasmDebugName &Name : Obj.debugNames()) {
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WasmYAML::NameEntry NameEntry;
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NameEntry.Name = Name.Name;
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NameEntry.Index = Name.Index;
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if (Name.Type == llvm::wasm::NameType::FUNCTION) {
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NameSec->FunctionNames.push_back(NameEntry);
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} else if (Name.Type == llvm::wasm::NameType::GLOBAL) {
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NameSec->GlobalNames.push_back(NameEntry);
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} else {
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assert(Name.Type == llvm::wasm::NameType::DATA_SEGMENT);
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NameSec->DataSegmentNames.push_back(NameEntry);
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}
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}
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CustomSec = std::move(NameSec);
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} else if (WasmSec.Name == "linking") {
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std::unique_ptr<WasmYAML::LinkingSection> LinkingSec =
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std::make_unique<WasmYAML::LinkingSection>();
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LinkingSec->Version = Obj.linkingData().Version;
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ArrayRef<StringRef> Comdats = Obj.linkingData().Comdats;
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for (StringRef ComdatName : Comdats)
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LinkingSec->Comdats.emplace_back(WasmYAML::Comdat{ComdatName, {}});
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for (auto &Func : Obj.functions()) {
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if (Func.Comdat != UINT32_MAX) {
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LinkingSec->Comdats[Func.Comdat].Entries.emplace_back(
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WasmYAML::ComdatEntry{wasm::WASM_COMDAT_FUNCTION, Func.Index});
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}
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}
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uint32_t SegmentIndex = 0;
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for (const object::WasmSegment &Segment : Obj.dataSegments()) {
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if (!Segment.Data.Name.empty()) {
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WasmYAML::SegmentInfo SegmentInfo;
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SegmentInfo.Name = Segment.Data.Name;
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SegmentInfo.Index = SegmentIndex;
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SegmentInfo.Alignment = Segment.Data.Alignment;
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SegmentInfo.Flags = Segment.Data.LinkingFlags;
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LinkingSec->SegmentInfos.push_back(SegmentInfo);
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}
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if (Segment.Data.Comdat != UINT32_MAX) {
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LinkingSec->Comdats[Segment.Data.Comdat].Entries.emplace_back(
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WasmYAML::ComdatEntry{wasm::WASM_COMDAT_DATA, SegmentIndex});
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}
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SegmentIndex++;
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}
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uint32_t SectionIndex = 0;
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for (const auto &Sec : Obj.sections()) {
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const WasmSection &WasmSec = Obj.getWasmSection(Sec);
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if (WasmSec.Comdat != UINT32_MAX)
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LinkingSec->Comdats[WasmSec.Comdat].Entries.emplace_back(
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WasmYAML::ComdatEntry{wasm::WASM_COMDAT_SECTION, SectionIndex});
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SectionIndex++;
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}
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uint32_t SymbolIndex = 0;
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for (const wasm::WasmSymbolInfo &Symbol : Obj.linkingData().SymbolTable) {
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WasmYAML::SymbolInfo Info;
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Info.Index = SymbolIndex++;
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Info.Kind = static_cast<uint32_t>(Symbol.Kind);
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Info.Name = Symbol.Name;
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Info.Flags = Symbol.Flags;
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switch (Symbol.Kind) {
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case wasm::WASM_SYMBOL_TYPE_DATA:
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Info.DataRef = Symbol.DataRef;
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break;
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case wasm::WASM_SYMBOL_TYPE_FUNCTION:
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case wasm::WASM_SYMBOL_TYPE_GLOBAL:
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case wasm::WASM_SYMBOL_TYPE_TABLE:
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case wasm::WASM_SYMBOL_TYPE_TAG:
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Info.ElementIndex = Symbol.ElementIndex;
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break;
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case wasm::WASM_SYMBOL_TYPE_SECTION:
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Info.ElementIndex = Symbol.ElementIndex;
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break;
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}
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LinkingSec->SymbolTable.emplace_back(Info);
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}
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for (const wasm::WasmInitFunc &Func : Obj.linkingData().InitFunctions) {
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WasmYAML::InitFunction F{Func.Priority, Func.Symbol};
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LinkingSec->InitFunctions.emplace_back(F);
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}
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CustomSec = std::move(LinkingSec);
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} else if (WasmSec.Name == "producers") {
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std::unique_ptr<WasmYAML::ProducersSection> ProducersSec =
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std::make_unique<WasmYAML::ProducersSection>();
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const llvm::wasm::WasmProducerInfo &Info = Obj.getProducerInfo();
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for (auto &E : Info.Languages) {
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WasmYAML::ProducerEntry Producer;
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Producer.Name = E.first;
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Producer.Version = E.second;
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ProducersSec->Languages.push_back(Producer);
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}
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for (auto &E : Info.Tools) {
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WasmYAML::ProducerEntry Producer;
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Producer.Name = E.first;
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Producer.Version = E.second;
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ProducersSec->Tools.push_back(Producer);
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}
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for (auto &E : Info.SDKs) {
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WasmYAML::ProducerEntry Producer;
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Producer.Name = E.first;
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Producer.Version = E.second;
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ProducersSec->SDKs.push_back(Producer);
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}
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CustomSec = std::move(ProducersSec);
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} else if (WasmSec.Name == "target_features") {
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std::unique_ptr<WasmYAML::TargetFeaturesSection> TargetFeaturesSec =
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std::make_unique<WasmYAML::TargetFeaturesSection>();
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for (auto &E : Obj.getTargetFeatures()) {
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WasmYAML::FeatureEntry Feature;
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Feature.Prefix = E.Prefix;
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Feature.Name = E.Name;
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TargetFeaturesSec->Features.push_back(Feature);
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}
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CustomSec = std::move(TargetFeaturesSec);
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} else {
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CustomSec = std::make_unique<WasmYAML::CustomSection>(WasmSec.Name);
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}
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CustomSec->Payload = yaml::BinaryRef(WasmSec.Content);
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return CustomSec;
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}
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ErrorOr<WasmYAML::Object *> WasmDumper::dump() {
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auto Y = std::make_unique<WasmYAML::Object>();
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// Dump header
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Y->Header.Version = Obj.getHeader().Version;
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// Dump sections
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for (const auto &Sec : Obj.sections()) {
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const WasmSection &WasmSec = Obj.getWasmSection(Sec);
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std::unique_ptr<WasmYAML::Section> S;
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switch (WasmSec.Type) {
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case wasm::WASM_SEC_CUSTOM: {
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if (WasmSec.Name.startswith("reloc.")) {
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// Relocations are attached the sections they apply to rather than
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// being represented as a custom section in the YAML output.
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continue;
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}
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S = dumpCustomSection(WasmSec);
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break;
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}
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case wasm::WASM_SEC_TYPE: {
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auto TypeSec = std::make_unique<WasmYAML::TypeSection>();
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uint32_t Index = 0;
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for (const auto &FunctionSig : Obj.types()) {
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WasmYAML::Signature Sig;
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Sig.Index = Index++;
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for (const auto &ParamType : FunctionSig.Params)
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Sig.ParamTypes.emplace_back(static_cast<uint32_t>(ParamType));
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for (const auto &ReturnType : FunctionSig.Returns)
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Sig.ReturnTypes.emplace_back(static_cast<uint32_t>(ReturnType));
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TypeSec->Signatures.push_back(Sig);
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}
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S = std::move(TypeSec);
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break;
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}
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case wasm::WASM_SEC_IMPORT: {
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auto ImportSec = std::make_unique<WasmYAML::ImportSection>();
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for (auto &Import : Obj.imports()) {
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WasmYAML::Import Im;
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Im.Module = Import.Module;
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Im.Field = Import.Field;
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Im.Kind = Import.Kind;
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switch (Im.Kind) {
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case wasm::WASM_EXTERNAL_FUNCTION:
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Im.SigIndex = Import.SigIndex;
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break;
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case wasm::WASM_EXTERNAL_GLOBAL:
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Im.GlobalImport.Type = Import.Global.Type;
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Im.GlobalImport.Mutable = Import.Global.Mutable;
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break;
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case wasm::WASM_EXTERNAL_TAG:
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Im.SigIndex = Import.SigIndex;
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break;
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case wasm::WASM_EXTERNAL_TABLE:
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// FIXME: Currently we always output an index of 0 for any imported
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// table.
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Im.TableImport = makeTable(0, Import.Table);
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break;
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case wasm::WASM_EXTERNAL_MEMORY:
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Im.Memory = makeLimits(Import.Memory);
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break;
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}
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ImportSec->Imports.push_back(Im);
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}
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S = std::move(ImportSec);
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break;
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}
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case wasm::WASM_SEC_FUNCTION: {
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auto FuncSec = std::make_unique<WasmYAML::FunctionSection>();
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for (const auto &Func : Obj.functions()) {
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FuncSec->FunctionTypes.push_back(Func.SigIndex);
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}
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S = std::move(FuncSec);
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break;
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}
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case wasm::WASM_SEC_TABLE: {
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auto TableSec = std::make_unique<WasmYAML::TableSection>();
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for (const wasm::WasmTable &Table : Obj.tables()) {
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TableSec->Tables.push_back(makeTable(Table.Index, Table.Type));
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}
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S = std::move(TableSec);
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break;
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}
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case wasm::WASM_SEC_MEMORY: {
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auto MemorySec = std::make_unique<WasmYAML::MemorySection>();
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for (const wasm::WasmLimits &Memory : Obj.memories()) {
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MemorySec->Memories.push_back(makeLimits(Memory));
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}
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S = std::move(MemorySec);
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break;
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}
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case wasm::WASM_SEC_TAG: {
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auto TagSec = std::make_unique<WasmYAML::TagSection>();
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for (auto &Tag : Obj.tags()) {
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TagSec->TagTypes.push_back(Tag.SigIndex);
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}
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S = std::move(TagSec);
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break;
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}
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case wasm::WASM_SEC_GLOBAL: {
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auto GlobalSec = std::make_unique<WasmYAML::GlobalSection>();
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for (auto &Global : Obj.globals()) {
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WasmYAML::Global G;
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G.Index = Global.Index;
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G.Type = Global.Type.Type;
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G.Mutable = Global.Type.Mutable;
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G.Init.Extended = Global.InitExpr.Extended;
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if (Global.InitExpr.Extended) {
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G.Init.Body = Global.InitExpr.Body;
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} else {
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G.Init.Inst = Global.InitExpr.Inst;
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}
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GlobalSec->Globals.push_back(G);
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}
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S = std::move(GlobalSec);
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break;
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}
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case wasm::WASM_SEC_START: {
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auto StartSec = std::make_unique<WasmYAML::StartSection>();
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StartSec->StartFunction = Obj.startFunction();
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S = std::move(StartSec);
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break;
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}
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case wasm::WASM_SEC_EXPORT: {
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auto ExportSec = std::make_unique<WasmYAML::ExportSection>();
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for (auto &Export : Obj.exports()) {
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WasmYAML::Export Ex;
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Ex.Name = Export.Name;
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Ex.Kind = Export.Kind;
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Ex.Index = Export.Index;
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ExportSec->Exports.push_back(Ex);
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}
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S = std::move(ExportSec);
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break;
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}
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case wasm::WASM_SEC_ELEM: {
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auto ElemSec = std::make_unique<WasmYAML::ElemSection>();
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for (auto &Segment : Obj.elements()) {
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WasmYAML::ElemSegment Seg;
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Seg.Flags = Segment.Flags;
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Seg.TableNumber = Segment.TableNumber;
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Seg.ElemKind = Segment.ElemKind;
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Seg.Offset.Extended = Segment.Offset.Extended;
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if (Seg.Offset.Extended) {
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Seg.Offset.Body = yaml::BinaryRef(Segment.Offset.Body);
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} else {
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Seg.Offset.Inst = Segment.Offset.Inst;
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}
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append_range(Seg.Functions, Segment.Functions);
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ElemSec->Segments.push_back(Seg);
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}
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S = std::move(ElemSec);
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break;
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}
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case wasm::WASM_SEC_CODE: {
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auto CodeSec = std::make_unique<WasmYAML::CodeSection>();
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for (auto &Func : Obj.functions()) {
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WasmYAML::Function Function;
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Function.Index = Func.Index;
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for (auto &Local : Func.Locals) {
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WasmYAML::LocalDecl LocalDecl;
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LocalDecl.Type = Local.Type;
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LocalDecl.Count = Local.Count;
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Function.Locals.push_back(LocalDecl);
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}
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Function.Body = yaml::BinaryRef(Func.Body);
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CodeSec->Functions.push_back(Function);
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}
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S = std::move(CodeSec);
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break;
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}
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case wasm::WASM_SEC_DATA: {
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auto DataSec = std::make_unique<WasmYAML::DataSection>();
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for (const object::WasmSegment &Segment : Obj.dataSegments()) {
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WasmYAML::DataSegment Seg;
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Seg.SectionOffset = Segment.SectionOffset;
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Seg.InitFlags = Segment.Data.InitFlags;
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Seg.MemoryIndex = Segment.Data.MemoryIndex;
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Seg.Offset.Extended = Segment.Data.Offset.Extended;
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if (Seg.Offset.Extended) {
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Seg.Offset.Body = yaml::BinaryRef(Segment.Data.Offset.Body);
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} else {
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Seg.Offset.Inst = Segment.Data.Offset.Inst;
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}
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Seg.Content = yaml::BinaryRef(Segment.Data.Content);
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DataSec->Segments.push_back(Seg);
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}
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S = std::move(DataSec);
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break;
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}
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case wasm::WASM_SEC_DATACOUNT: {
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auto DataCountSec = std::make_unique<WasmYAML::DataCountSection>();
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DataCountSec->Count = Obj.dataSegments().size();
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S = std::move(DataCountSec);
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break;
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}
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default:
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llvm_unreachable("Unknown section type");
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break;
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}
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// Only propagate the section size encoding length if it's not the minimal
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// size or 5 (the default "padded" value). This is to avoid having every
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// YAML output polluted with this value when we usually don't care about it
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// (and avoid rewriting all the test expectations).
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if (WasmSec.HeaderSecSizeEncodingLen &&
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WasmSec.HeaderSecSizeEncodingLen !=
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getULEB128Size(WasmSec.Content.size()) &&
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WasmSec.HeaderSecSizeEncodingLen != 5)
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S->HeaderSecSizeEncodingLen = WasmSec.HeaderSecSizeEncodingLen;
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for (const wasm::WasmRelocation &Reloc : WasmSec.Relocations) {
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WasmYAML::Relocation R;
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R.Type = Reloc.Type;
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R.Index = Reloc.Index;
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R.Offset = Reloc.Offset;
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R.Addend = Reloc.Addend;
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S->Relocations.push_back(R);
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}
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Y->Sections.push_back(std::move(S));
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}
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return Y.release();
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}
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std::error_code wasm2yaml(raw_ostream &Out, const object::WasmObjectFile &Obj) {
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WasmDumper Dumper(Obj);
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ErrorOr<WasmYAML::Object *> YAMLOrErr = Dumper.dump();
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if (std::error_code EC = YAMLOrErr.getError())
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return EC;
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std::unique_ptr<WasmYAML::Object> YAML(YAMLOrErr.get());
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yaml::Output Yout(Out);
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Yout << *YAML;
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return std::error_code();
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}
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