fef8de66a6
Summary: This ensures that object files will continue to validate as WebAssembly modules in the presence of bulk memory operations. Engines that don't support bulk memory operations will not recognize the DataCount section and will report validation errors, but that's ok because object files aren't supposed to be run directly anyway. Reviewers: aheejin, dschuff, sbc100 Subscribers: jgravelle-google, hiraditya, sunfish, rupprecht, llvm-commits Tags: #llvm Differential Revision: https://reviews.llvm.org/D60623 llvm-svn: 358315
664 lines
22 KiB
C++
664 lines
22 KiB
C++
//===- yaml2wasm - Convert YAML to a Wasm object file --------------------===//
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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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///
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/// \file
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/// The Wasm component of yaml2obj.
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///
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//===----------------------------------------------------------------------===//
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//
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#include "llvm/Object/Wasm.h"
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#include "llvm/ObjectYAML/ObjectYAML.h"
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#include "llvm/Support/Endian.h"
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#include "llvm/Support/LEB128.h"
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using namespace llvm;
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/// This parses a yaml stream that represents a Wasm object file.
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/// See docs/yaml2obj for the yaml scheema.
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class WasmWriter {
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public:
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WasmWriter(WasmYAML::Object &Obj) : Obj(Obj) {}
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int writeWasm(raw_ostream &OS);
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private:
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int writeRelocSection(raw_ostream &OS, WasmYAML::Section &Sec,
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uint32_t SectionIndex);
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int writeSectionContent(raw_ostream &OS, WasmYAML::CustomSection &Section);
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int writeSectionContent(raw_ostream &OS, WasmYAML::TypeSection &Section);
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int writeSectionContent(raw_ostream &OS, WasmYAML::ImportSection &Section);
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int writeSectionContent(raw_ostream &OS, WasmYAML::FunctionSection &Section);
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int writeSectionContent(raw_ostream &OS, WasmYAML::TableSection &Section);
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int writeSectionContent(raw_ostream &OS, WasmYAML::MemorySection &Section);
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int writeSectionContent(raw_ostream &OS, WasmYAML::GlobalSection &Section);
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int writeSectionContent(raw_ostream &OS, WasmYAML::EventSection &Section);
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int writeSectionContent(raw_ostream &OS, WasmYAML::ExportSection &Section);
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int writeSectionContent(raw_ostream &OS, WasmYAML::StartSection &Section);
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int writeSectionContent(raw_ostream &OS, WasmYAML::ElemSection &Section);
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int writeSectionContent(raw_ostream &OS, WasmYAML::CodeSection &Section);
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int writeSectionContent(raw_ostream &OS, WasmYAML::DataSection &Section);
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int writeSectionContent(raw_ostream &OS, WasmYAML::DataCountSection &Section);
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// Custom section types
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int writeSectionContent(raw_ostream &OS, WasmYAML::DylinkSection &Section);
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int writeSectionContent(raw_ostream &OS, WasmYAML::NameSection &Section);
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int writeSectionContent(raw_ostream &OS, WasmYAML::LinkingSection &Section);
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int writeSectionContent(raw_ostream &OS, WasmYAML::ProducersSection &Section);
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int writeSectionContent(raw_ostream &OS,
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WasmYAML::TargetFeaturesSection &Section);
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WasmYAML::Object &Obj;
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uint32_t NumImportedFunctions = 0;
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uint32_t NumImportedGlobals = 0;
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uint32_t NumImportedEvents = 0;
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};
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static int writeUint64(raw_ostream &OS, uint64_t Value) {
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char Data[sizeof(Value)];
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support::endian::write64le(Data, Value);
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OS.write(Data, sizeof(Data));
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return 0;
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}
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static int writeUint32(raw_ostream &OS, uint32_t Value) {
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char Data[sizeof(Value)];
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support::endian::write32le(Data, Value);
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OS.write(Data, sizeof(Data));
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return 0;
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}
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static int writeUint8(raw_ostream &OS, uint8_t Value) {
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char Data[sizeof(Value)];
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memcpy(Data, &Value, sizeof(Data));
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OS.write(Data, sizeof(Data));
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return 0;
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}
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static int writeStringRef(const StringRef &Str, raw_ostream &OS) {
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encodeULEB128(Str.size(), OS);
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OS << Str;
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return 0;
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}
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static int writeLimits(const WasmYAML::Limits &Lim, raw_ostream &OS) {
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writeUint8(OS, Lim.Flags);
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encodeULEB128(Lim.Initial, OS);
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if (Lim.Flags & wasm::WASM_LIMITS_FLAG_HAS_MAX)
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encodeULEB128(Lim.Maximum, OS);
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return 0;
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}
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static int writeInitExpr(const wasm::WasmInitExpr &InitExpr, raw_ostream &OS) {
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writeUint8(OS, InitExpr.Opcode);
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switch (InitExpr.Opcode) {
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case wasm::WASM_OPCODE_I32_CONST:
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encodeSLEB128(InitExpr.Value.Int32, OS);
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break;
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case wasm::WASM_OPCODE_I64_CONST:
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encodeSLEB128(InitExpr.Value.Int64, OS);
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break;
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case wasm::WASM_OPCODE_F32_CONST:
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writeUint32(OS, InitExpr.Value.Float32);
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break;
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case wasm::WASM_OPCODE_F64_CONST:
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writeUint64(OS, InitExpr.Value.Float64);
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break;
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case wasm::WASM_OPCODE_GLOBAL_GET:
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encodeULEB128(InitExpr.Value.Global, OS);
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break;
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default:
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errs() << "Unknown opcode in init_expr: " << InitExpr.Opcode << "\n";
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return 1;
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}
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writeUint8(OS, wasm::WASM_OPCODE_END);
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return 0;
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}
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class SubSectionWriter {
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raw_ostream &OS;
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std::string OutString;
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raw_string_ostream StringStream;
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public:
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SubSectionWriter(raw_ostream &OS) : OS(OS), StringStream(OutString) {}
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void done() {
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StringStream.flush();
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encodeULEB128(OutString.size(), OS);
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OS << OutString;
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OutString.clear();
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}
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raw_ostream &getStream() { return StringStream; }
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};
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int WasmWriter::writeSectionContent(raw_ostream &OS,
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WasmYAML::DylinkSection &Section) {
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writeStringRef(Section.Name, OS);
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encodeULEB128(Section.MemorySize, OS);
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encodeULEB128(Section.MemoryAlignment, OS);
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encodeULEB128(Section.TableSize, OS);
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encodeULEB128(Section.TableAlignment, OS);
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encodeULEB128(Section.Needed.size(), OS);
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for (StringRef Needed : Section.Needed) {
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writeStringRef(Needed, OS);
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}
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return 0;
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}
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int WasmWriter::writeSectionContent(raw_ostream &OS,
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WasmYAML::LinkingSection &Section) {
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writeStringRef(Section.Name, OS);
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encodeULEB128(Section.Version, OS);
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SubSectionWriter SubSection(OS);
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// SYMBOL_TABLE subsection
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if (Section.SymbolTable.size()) {
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writeUint8(OS, wasm::WASM_SYMBOL_TABLE);
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encodeULEB128(Section.SymbolTable.size(), SubSection.getStream());
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#ifndef NDEBUG
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uint32_t SymbolIndex = 0;
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#endif
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for (const WasmYAML::SymbolInfo &Info : Section.SymbolTable) {
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assert(Info.Index == SymbolIndex++);
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writeUint8(SubSection.getStream(), Info.Kind);
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encodeULEB128(Info.Flags, SubSection.getStream());
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switch (Info.Kind) {
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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_EVENT:
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encodeULEB128(Info.ElementIndex, SubSection.getStream());
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if ((Info.Flags & wasm::WASM_SYMBOL_UNDEFINED) == 0 ||
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(Info.Flags & wasm::WASM_SYMBOL_EXPLICIT_NAME) != 0)
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writeStringRef(Info.Name, SubSection.getStream());
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break;
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case wasm::WASM_SYMBOL_TYPE_DATA:
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writeStringRef(Info.Name, SubSection.getStream());
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if ((Info.Flags & wasm::WASM_SYMBOL_UNDEFINED) == 0) {
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encodeULEB128(Info.DataRef.Segment, SubSection.getStream());
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encodeULEB128(Info.DataRef.Offset, SubSection.getStream());
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encodeULEB128(Info.DataRef.Size, SubSection.getStream());
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}
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break;
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case wasm::WASM_SYMBOL_TYPE_SECTION:
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encodeULEB128(Info.ElementIndex, SubSection.getStream());
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break;
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default:
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llvm_unreachable("unexpected kind");
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}
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}
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SubSection.done();
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}
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// SEGMENT_NAMES subsection
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if (Section.SegmentInfos.size()) {
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writeUint8(OS, wasm::WASM_SEGMENT_INFO);
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encodeULEB128(Section.SegmentInfos.size(), SubSection.getStream());
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for (const WasmYAML::SegmentInfo &SegmentInfo : Section.SegmentInfos) {
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writeStringRef(SegmentInfo.Name, SubSection.getStream());
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encodeULEB128(SegmentInfo.Alignment, SubSection.getStream());
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encodeULEB128(SegmentInfo.Flags, SubSection.getStream());
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}
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SubSection.done();
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}
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// INIT_FUNCS subsection
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if (Section.InitFunctions.size()) {
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writeUint8(OS, wasm::WASM_INIT_FUNCS);
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encodeULEB128(Section.InitFunctions.size(), SubSection.getStream());
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for (const WasmYAML::InitFunction &Func : Section.InitFunctions) {
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encodeULEB128(Func.Priority, SubSection.getStream());
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encodeULEB128(Func.Symbol, SubSection.getStream());
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}
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SubSection.done();
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}
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// COMDAT_INFO subsection
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if (Section.Comdats.size()) {
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writeUint8(OS, wasm::WASM_COMDAT_INFO);
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encodeULEB128(Section.Comdats.size(), SubSection.getStream());
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for (const auto &C : Section.Comdats) {
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writeStringRef(C.Name, SubSection.getStream());
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encodeULEB128(0, SubSection.getStream()); // flags for future use
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encodeULEB128(C.Entries.size(), SubSection.getStream());
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for (const WasmYAML::ComdatEntry &Entry : C.Entries) {
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writeUint8(SubSection.getStream(), Entry.Kind);
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encodeULEB128(Entry.Index, SubSection.getStream());
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}
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}
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SubSection.done();
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}
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return 0;
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}
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int WasmWriter::writeSectionContent(raw_ostream &OS,
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WasmYAML::NameSection &Section) {
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writeStringRef(Section.Name, OS);
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if (Section.FunctionNames.size()) {
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writeUint8(OS, wasm::WASM_NAMES_FUNCTION);
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SubSectionWriter SubSection(OS);
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encodeULEB128(Section.FunctionNames.size(), SubSection.getStream());
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for (const WasmYAML::NameEntry &NameEntry : Section.FunctionNames) {
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encodeULEB128(NameEntry.Index, SubSection.getStream());
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writeStringRef(NameEntry.Name, SubSection.getStream());
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}
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SubSection.done();
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}
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return 0;
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}
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int WasmWriter::writeSectionContent(raw_ostream &OS,
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WasmYAML::ProducersSection &Section) {
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writeStringRef(Section.Name, OS);
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int Fields = int(!Section.Languages.empty()) + int(!Section.Tools.empty()) +
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int(!Section.SDKs.empty());
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if (Fields == 0)
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return 0;
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encodeULEB128(Fields, OS);
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for (auto &Field : {std::make_pair(StringRef("language"), &Section.Languages),
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std::make_pair(StringRef("processed-by"), &Section.Tools),
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std::make_pair(StringRef("sdk"), &Section.SDKs)}) {
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if (Field.second->empty())
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continue;
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writeStringRef(Field.first, OS);
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encodeULEB128(Field.second->size(), OS);
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for (auto &Entry : *Field.second) {
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writeStringRef(Entry.Name, OS);
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writeStringRef(Entry.Version, OS);
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}
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}
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return 0;
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}
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int WasmWriter::writeSectionContent(raw_ostream &OS,
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WasmYAML::TargetFeaturesSection &Section) {
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writeStringRef(Section.Name, OS);
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encodeULEB128(Section.Features.size(), OS);
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for (auto &E : Section.Features) {
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writeUint8(OS, E.Prefix);
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writeStringRef(E.Name, OS);
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}
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return 0;
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}
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int WasmWriter::writeSectionContent(raw_ostream &OS,
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WasmYAML::CustomSection &Section) {
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if (auto S = dyn_cast<WasmYAML::DylinkSection>(&Section)) {
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if (auto Err = writeSectionContent(OS, *S))
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return Err;
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} else if (auto S = dyn_cast<WasmYAML::NameSection>(&Section)) {
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if (auto Err = writeSectionContent(OS, *S))
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return Err;
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} else if (auto S = dyn_cast<WasmYAML::LinkingSection>(&Section)) {
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if (auto Err = writeSectionContent(OS, *S))
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return Err;
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} else if (auto S = dyn_cast<WasmYAML::ProducersSection>(&Section)) {
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if (auto Err = writeSectionContent(OS, *S))
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return Err;
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} else if (auto S = dyn_cast<WasmYAML::TargetFeaturesSection>(&Section)) {
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if (auto Err = writeSectionContent(OS, *S))
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return Err;
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} else {
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writeStringRef(Section.Name, OS);
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Section.Payload.writeAsBinary(OS);
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}
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return 0;
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}
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int WasmWriter::writeSectionContent(raw_ostream &OS,
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WasmYAML::TypeSection &Section) {
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encodeULEB128(Section.Signatures.size(), OS);
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uint32_t ExpectedIndex = 0;
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for (const WasmYAML::Signature &Sig : Section.Signatures) {
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if (Sig.Index != ExpectedIndex) {
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errs() << "Unexpected type index: " << Sig.Index << "\n";
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return 1;
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}
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++ExpectedIndex;
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writeUint8(OS, Sig.Form);
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encodeULEB128(Sig.ParamTypes.size(), OS);
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for (auto ParamType : Sig.ParamTypes)
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writeUint8(OS, ParamType);
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if (Sig.ReturnType == wasm::WASM_TYPE_NORESULT) {
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encodeULEB128(0, OS);
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} else {
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encodeULEB128(1, OS);
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writeUint8(OS, Sig.ReturnType);
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}
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}
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return 0;
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}
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int WasmWriter::writeSectionContent(raw_ostream &OS,
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WasmYAML::ImportSection &Section) {
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encodeULEB128(Section.Imports.size(), OS);
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for (const WasmYAML::Import &Import : Section.Imports) {
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writeStringRef(Import.Module, OS);
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writeStringRef(Import.Field, OS);
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writeUint8(OS, Import.Kind);
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switch (Import.Kind) {
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case wasm::WASM_EXTERNAL_FUNCTION:
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encodeULEB128(Import.SigIndex, OS);
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NumImportedFunctions++;
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break;
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case wasm::WASM_EXTERNAL_GLOBAL:
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writeUint8(OS, Import.GlobalImport.Type);
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writeUint8(OS, Import.GlobalImport.Mutable);
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NumImportedGlobals++;
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break;
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case wasm::WASM_EXTERNAL_EVENT:
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writeUint32(OS, Import.EventImport.Attribute);
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writeUint32(OS, Import.EventImport.SigIndex);
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NumImportedGlobals++;
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break;
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case wasm::WASM_EXTERNAL_MEMORY:
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writeLimits(Import.Memory, OS);
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break;
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case wasm::WASM_EXTERNAL_TABLE:
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writeUint8(OS, Import.TableImport.ElemType);
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writeLimits(Import.TableImport.TableLimits, OS);
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break;
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default:
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errs() << "Unknown import type: " << Import.Kind << "\n";
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return 1;
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}
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}
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return 0;
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}
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int WasmWriter::writeSectionContent(raw_ostream &OS,
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WasmYAML::FunctionSection &Section) {
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encodeULEB128(Section.FunctionTypes.size(), OS);
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for (uint32_t FuncType : Section.FunctionTypes) {
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encodeULEB128(FuncType, OS);
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}
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return 0;
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}
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int WasmWriter::writeSectionContent(raw_ostream &OS,
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WasmYAML::ExportSection &Section) {
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encodeULEB128(Section.Exports.size(), OS);
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for (const WasmYAML::Export &Export : Section.Exports) {
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writeStringRef(Export.Name, OS);
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writeUint8(OS, Export.Kind);
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encodeULEB128(Export.Index, OS);
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}
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return 0;
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}
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int WasmWriter::writeSectionContent(raw_ostream &OS,
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WasmYAML::StartSection &Section) {
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encodeULEB128(Section.StartFunction, OS);
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return 0;
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}
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int WasmWriter::writeSectionContent(raw_ostream &OS,
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WasmYAML::TableSection &Section) {
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encodeULEB128(Section.Tables.size(), OS);
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for (auto &Table : Section.Tables) {
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writeUint8(OS, Table.ElemType);
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writeLimits(Table.TableLimits, OS);
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}
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return 0;
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}
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int WasmWriter::writeSectionContent(raw_ostream &OS,
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WasmYAML::MemorySection &Section) {
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encodeULEB128(Section.Memories.size(), OS);
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for (const WasmYAML::Limits &Mem : Section.Memories) {
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writeLimits(Mem, OS);
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}
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return 0;
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}
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int WasmWriter::writeSectionContent(raw_ostream &OS,
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WasmYAML::GlobalSection &Section) {
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encodeULEB128(Section.Globals.size(), OS);
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uint32_t ExpectedIndex = NumImportedGlobals;
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for (auto &Global : Section.Globals) {
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if (Global.Index != ExpectedIndex) {
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errs() << "Unexpected global index: " << Global.Index << "\n";
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return 1;
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}
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++ExpectedIndex;
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writeUint8(OS, Global.Type);
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writeUint8(OS, Global.Mutable);
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writeInitExpr(Global.InitExpr, OS);
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}
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return 0;
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}
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int WasmWriter::writeSectionContent(raw_ostream &OS,
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WasmYAML::EventSection &Section) {
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encodeULEB128(Section.Events.size(), OS);
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uint32_t ExpectedIndex = NumImportedEvents;
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for (auto &Event : Section.Events) {
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if (Event.Index != ExpectedIndex) {
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errs() << "Unexpected event index: " << Event.Index << "\n";
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return 1;
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}
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++ExpectedIndex;
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encodeULEB128(Event.Attribute, OS);
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encodeULEB128(Event.SigIndex, OS);
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}
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return 0;
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}
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int WasmWriter::writeSectionContent(raw_ostream &OS,
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WasmYAML::ElemSection &Section) {
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encodeULEB128(Section.Segments.size(), OS);
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for (auto &Segment : Section.Segments) {
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encodeULEB128(Segment.TableIndex, OS);
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writeInitExpr(Segment.Offset, OS);
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encodeULEB128(Segment.Functions.size(), OS);
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for (auto &Function : Segment.Functions) {
|
|
encodeULEB128(Function, OS);
|
|
}
|
|
}
|
|
return 0;
|
|
}
|
|
|
|
int WasmWriter::writeSectionContent(raw_ostream &OS,
|
|
WasmYAML::CodeSection &Section) {
|
|
encodeULEB128(Section.Functions.size(), OS);
|
|
uint32_t ExpectedIndex = NumImportedFunctions;
|
|
for (auto &Func : Section.Functions) {
|
|
std::string OutString;
|
|
raw_string_ostream StringStream(OutString);
|
|
if (Func.Index != ExpectedIndex) {
|
|
errs() << "Unexpected function index: " << Func.Index << "\n";
|
|
return 1;
|
|
}
|
|
++ExpectedIndex;
|
|
|
|
encodeULEB128(Func.Locals.size(), StringStream);
|
|
for (auto &LocalDecl : Func.Locals) {
|
|
encodeULEB128(LocalDecl.Count, StringStream);
|
|
writeUint8(StringStream, LocalDecl.Type);
|
|
}
|
|
|
|
Func.Body.writeAsBinary(StringStream);
|
|
|
|
// Write the section size followed by the content
|
|
StringStream.flush();
|
|
encodeULEB128(OutString.size(), OS);
|
|
OS << OutString;
|
|
}
|
|
return 0;
|
|
}
|
|
|
|
int WasmWriter::writeSectionContent(raw_ostream &OS,
|
|
WasmYAML::DataSection &Section) {
|
|
encodeULEB128(Section.Segments.size(), OS);
|
|
for (auto &Segment : Section.Segments) {
|
|
encodeULEB128(Segment.InitFlags, OS);
|
|
if (Segment.InitFlags & wasm::WASM_SEGMENT_HAS_MEMINDEX)
|
|
encodeULEB128(Segment.MemoryIndex, OS);
|
|
if ((Segment.InitFlags & wasm::WASM_SEGMENT_IS_PASSIVE) == 0)
|
|
writeInitExpr(Segment.Offset, OS);
|
|
encodeULEB128(Segment.Content.binary_size(), OS);
|
|
Segment.Content.writeAsBinary(OS);
|
|
}
|
|
return 0;
|
|
}
|
|
|
|
int WasmWriter::writeSectionContent(raw_ostream &OS,
|
|
WasmYAML::DataCountSection &Section) {
|
|
encodeULEB128(Section.Count, OS);
|
|
return 0;
|
|
}
|
|
|
|
int WasmWriter::writeRelocSection(raw_ostream &OS, WasmYAML::Section &Sec,
|
|
uint32_t SectionIndex) {
|
|
switch (Sec.Type) {
|
|
case wasm::WASM_SEC_CODE:
|
|
writeStringRef("reloc.CODE", OS);
|
|
break;
|
|
case wasm::WASM_SEC_DATA:
|
|
writeStringRef("reloc.DATA", OS);
|
|
break;
|
|
case wasm::WASM_SEC_CUSTOM: {
|
|
auto CustomSection = dyn_cast<WasmYAML::CustomSection>(&Sec);
|
|
if (!CustomSection->Name.startswith(".debug_")) {
|
|
llvm_unreachable("not yet implemented (only for debug sections)");
|
|
return 1;
|
|
}
|
|
|
|
writeStringRef(("reloc." + CustomSection->Name).str(), OS);
|
|
break;
|
|
}
|
|
default:
|
|
llvm_unreachable("not yet implemented");
|
|
return 1;
|
|
}
|
|
|
|
encodeULEB128(SectionIndex, OS);
|
|
encodeULEB128(Sec.Relocations.size(), OS);
|
|
|
|
for (auto Reloc : Sec.Relocations) {
|
|
writeUint8(OS, Reloc.Type);
|
|
encodeULEB128(Reloc.Offset, OS);
|
|
encodeULEB128(Reloc.Index, OS);
|
|
switch (Reloc.Type) {
|
|
case wasm::R_WASM_MEMORY_ADDR_LEB:
|
|
case wasm::R_WASM_MEMORY_ADDR_SLEB:
|
|
case wasm::R_WASM_MEMORY_ADDR_I32:
|
|
case wasm::R_WASM_FUNCTION_OFFSET_I32:
|
|
case wasm::R_WASM_SECTION_OFFSET_I32:
|
|
encodeULEB128(Reloc.Addend, OS);
|
|
}
|
|
}
|
|
return 0;
|
|
}
|
|
|
|
int WasmWriter::writeWasm(raw_ostream &OS) {
|
|
// Write headers
|
|
OS.write(wasm::WasmMagic, sizeof(wasm::WasmMagic));
|
|
writeUint32(OS, Obj.Header.Version);
|
|
|
|
// Write each section
|
|
llvm::object::WasmSectionOrderChecker Checker;
|
|
for (const std::unique_ptr<WasmYAML::Section> &Sec : Obj.Sections) {
|
|
StringRef SecName = "";
|
|
if (auto S = dyn_cast<WasmYAML::CustomSection>(Sec.get()))
|
|
SecName = S->Name;
|
|
if (!Checker.isValidSectionOrder(Sec->Type, SecName)) {
|
|
errs() << "Out of order section type: " << Sec->Type << "\n";
|
|
return 1;
|
|
}
|
|
encodeULEB128(Sec->Type, OS);
|
|
std::string OutString;
|
|
raw_string_ostream StringStream(OutString);
|
|
if (auto S = dyn_cast<WasmYAML::CustomSection>(Sec.get())) {
|
|
if (auto Err = writeSectionContent(StringStream, *S))
|
|
return Err;
|
|
} else if (auto S = dyn_cast<WasmYAML::TypeSection>(Sec.get())) {
|
|
if (auto Err = writeSectionContent(StringStream, *S))
|
|
return Err;
|
|
} else if (auto S = dyn_cast<WasmYAML::ImportSection>(Sec.get())) {
|
|
if (auto Err = writeSectionContent(StringStream, *S))
|
|
return Err;
|
|
} else if (auto S = dyn_cast<WasmYAML::FunctionSection>(Sec.get())) {
|
|
if (auto Err = writeSectionContent(StringStream, *S))
|
|
return Err;
|
|
} else if (auto S = dyn_cast<WasmYAML::TableSection>(Sec.get())) {
|
|
if (auto Err = writeSectionContent(StringStream, *S))
|
|
return Err;
|
|
} else if (auto S = dyn_cast<WasmYAML::MemorySection>(Sec.get())) {
|
|
if (auto Err = writeSectionContent(StringStream, *S))
|
|
return Err;
|
|
} else if (auto S = dyn_cast<WasmYAML::GlobalSection>(Sec.get())) {
|
|
if (auto Err = writeSectionContent(StringStream, *S))
|
|
return Err;
|
|
} else if (auto S = dyn_cast<WasmYAML::EventSection>(Sec.get())) {
|
|
if (auto Err = writeSectionContent(StringStream, *S))
|
|
return Err;
|
|
} else if (auto S = dyn_cast<WasmYAML::ExportSection>(Sec.get())) {
|
|
if (auto Err = writeSectionContent(StringStream, *S))
|
|
return Err;
|
|
} else if (auto S = dyn_cast<WasmYAML::StartSection>(Sec.get())) {
|
|
if (auto Err = writeSectionContent(StringStream, *S))
|
|
return Err;
|
|
} else if (auto S = dyn_cast<WasmYAML::ElemSection>(Sec.get())) {
|
|
if (auto Err = writeSectionContent(StringStream, *S))
|
|
return Err;
|
|
} else if (auto S = dyn_cast<WasmYAML::CodeSection>(Sec.get())) {
|
|
if (auto Err = writeSectionContent(StringStream, *S))
|
|
return Err;
|
|
} else if (auto S = dyn_cast<WasmYAML::DataSection>(Sec.get())) {
|
|
if (auto Err = writeSectionContent(StringStream, *S))
|
|
return Err;
|
|
} else if (auto S = dyn_cast<WasmYAML::DataCountSection>(Sec.get())) {
|
|
if (auto Err = writeSectionContent(StringStream, *S))
|
|
return Err;
|
|
} else {
|
|
errs() << "Unknown section type: " << Sec->Type << "\n";
|
|
return 1;
|
|
}
|
|
StringStream.flush();
|
|
|
|
// Write the section size followed by the content
|
|
encodeULEB128(OutString.size(), OS);
|
|
OS << OutString;
|
|
}
|
|
|
|
// write reloc sections for any section that have relocations
|
|
uint32_t SectionIndex = 0;
|
|
for (const std::unique_ptr<WasmYAML::Section> &Sec : Obj.Sections) {
|
|
if (Sec->Relocations.empty()) {
|
|
SectionIndex++;
|
|
continue;
|
|
}
|
|
|
|
writeUint8(OS, wasm::WASM_SEC_CUSTOM);
|
|
std::string OutString;
|
|
raw_string_ostream StringStream(OutString);
|
|
writeRelocSection(StringStream, *Sec, SectionIndex++);
|
|
StringStream.flush();
|
|
|
|
encodeULEB128(OutString.size(), OS);
|
|
OS << OutString;
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
int yaml2wasm(llvm::WasmYAML::Object &Doc, raw_ostream &Out) {
|
|
WasmWriter Writer(Doc);
|
|
|
|
return Writer.writeWasm(Out);
|
|
}
|