9ac5620cb8
This patch renames the "Initial" member of WasmLimits to the name used in the spec, "Minimum". In the core WebAssembly specification, the Limits data type has one required "min" member and one optional "max" member, indicating the minimum required size of the corresponding table or memory, and the maximum size, if any. Although the WebAssembly spec does instantiate locally-defined tables and memories with the initial size being equal to the minimum size, it can't impose such a requirement for imports. It doesn't make sense to require an initial size for a memory import, for example. The compiler can only sensibly express the minimum and maximum sizes. See https://github.com/WebAssembly/js-types/blob/master/proposals/js-types/Overview.md#naming-of-size-limits for a related discussion that agrees that the right name of "initial" is "minimum" when querying the type of a table or memory from JavaScript. (Of course it still makes sense for JS to speak in terms of an initial size when it explicitly instantiates memories and tables.) Differential Revision: https://reviews.llvm.org/D99186
689 lines
23 KiB
C++
689 lines
23 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/ObjectYAML/yaml2obj.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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namespace {
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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, yaml::ErrorHandler EH)
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: Obj(Obj), ErrHandler(EH) {}
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bool writeWasm(raw_ostream &OS);
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private:
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void writeRelocSection(raw_ostream &OS, WasmYAML::Section &Sec,
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uint32_t SectionIndex);
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void writeInitExpr(raw_ostream &OS, const wasm::WasmInitExpr &InitExpr);
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void writeSectionContent(raw_ostream &OS, WasmYAML::CustomSection &Section);
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void writeSectionContent(raw_ostream &OS, WasmYAML::TypeSection &Section);
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void writeSectionContent(raw_ostream &OS, WasmYAML::ImportSection &Section);
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void writeSectionContent(raw_ostream &OS, WasmYAML::FunctionSection &Section);
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void writeSectionContent(raw_ostream &OS, WasmYAML::TableSection &Section);
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void writeSectionContent(raw_ostream &OS, WasmYAML::MemorySection &Section);
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void writeSectionContent(raw_ostream &OS, WasmYAML::EventSection &Section);
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void writeSectionContent(raw_ostream &OS, WasmYAML::GlobalSection &Section);
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void writeSectionContent(raw_ostream &OS, WasmYAML::ExportSection &Section);
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void writeSectionContent(raw_ostream &OS, WasmYAML::StartSection &Section);
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void writeSectionContent(raw_ostream &OS, WasmYAML::ElemSection &Section);
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void writeSectionContent(raw_ostream &OS, WasmYAML::CodeSection &Section);
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void writeSectionContent(raw_ostream &OS, WasmYAML::DataSection &Section);
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void writeSectionContent(raw_ostream &OS, WasmYAML::DataCountSection &Section);
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// Custom section types
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void writeSectionContent(raw_ostream &OS, WasmYAML::DylinkSection &Section);
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void writeSectionContent(raw_ostream &OS, WasmYAML::NameSection &Section);
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void writeSectionContent(raw_ostream &OS, WasmYAML::LinkingSection &Section);
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void writeSectionContent(raw_ostream &OS, WasmYAML::ProducersSection &Section);
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void 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 NumImportedTables = 0;
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uint32_t NumImportedEvents = 0;
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bool HasError = false;
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yaml::ErrorHandler ErrHandler;
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void reportError(const Twine &Msg);
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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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} // end anonymous namespace
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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.Minimum, 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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void WasmWriter::reportError(const Twine &Msg) {
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ErrHandler(Msg);
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HasError = true;
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}
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void WasmWriter::writeInitExpr(raw_ostream &OS,
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const wasm::WasmInitExpr &InitExpr) {
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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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reportError("unknown opcode in init_expr: " + Twine(InitExpr.Opcode));
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return;
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}
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writeUint8(OS, wasm::WASM_OPCODE_END);
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}
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void 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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void 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_TABLE:
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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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}
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void 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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if (Section.GlobalNames.size()) {
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writeUint8(OS, wasm::WASM_NAMES_GLOBAL);
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SubSectionWriter SubSection(OS);
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encodeULEB128(Section.GlobalNames.size(), SubSection.getStream());
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for (const WasmYAML::NameEntry &NameEntry : Section.GlobalNames) {
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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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if (Section.DataSegmentNames.size()) {
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writeUint8(OS, wasm::WASM_NAMES_DATA_SEGMENT);
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SubSectionWriter SubSection(OS);
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encodeULEB128(Section.DataSegmentNames.size(), SubSection.getStream());
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for (const WasmYAML::NameEntry &NameEntry : Section.DataSegmentNames) {
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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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}
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void 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;
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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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}
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void 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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}
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void 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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writeSectionContent(OS, *S);
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} else if (auto S = dyn_cast<WasmYAML::NameSection>(&Section)) {
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writeSectionContent(OS, *S);
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} else if (auto S = dyn_cast<WasmYAML::LinkingSection>(&Section)) {
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writeSectionContent(OS, *S);
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} else if (auto S = dyn_cast<WasmYAML::ProducersSection>(&Section)) {
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writeSectionContent(OS, *S);
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} else if (auto S = dyn_cast<WasmYAML::TargetFeaturesSection>(&Section)) {
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writeSectionContent(OS, *S);
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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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}
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void 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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reportError("unexpected type index: " + Twine(Sig.Index));
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return;
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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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encodeULEB128(Sig.ReturnTypes.size(), OS);
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for (auto ReturnType : Sig.ReturnTypes)
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writeUint8(OS, ReturnType);
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}
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}
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void 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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NumImportedEvents++;
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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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NumImportedTables++;
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break;
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default:
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reportError("unknown import type: " +Twine(Import.Kind));
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return;
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}
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}
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}
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void 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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void 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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}
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void WasmWriter::writeSectionContent(raw_ostream &OS,
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WasmYAML::StartSection &Section) {
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encodeULEB128(Section.StartFunction, OS);
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}
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void 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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uint32_t ExpectedIndex = NumImportedTables;
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for (auto &Table : Section.Tables) {
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if (Table.Index != ExpectedIndex) {
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reportError("unexpected table index: " + Twine(Table.Index));
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return;
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}
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++ExpectedIndex;
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writeUint8(OS, Table.ElemType);
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writeLimits(Table.TableLimits, OS);
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}
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}
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void 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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void 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) {
|
|
reportError("unexpected event index: " + Twine(Event.Index));
|
|
return;
|
|
}
|
|
++ExpectedIndex;
|
|
encodeULEB128(Event.Attribute, OS);
|
|
encodeULEB128(Event.SigIndex, OS);
|
|
}
|
|
}
|
|
|
|
void WasmWriter::writeSectionContent(raw_ostream &OS,
|
|
WasmYAML::GlobalSection &Section) {
|
|
encodeULEB128(Section.Globals.size(), OS);
|
|
uint32_t ExpectedIndex = NumImportedGlobals;
|
|
for (auto &Global : Section.Globals) {
|
|
if (Global.Index != ExpectedIndex) {
|
|
reportError("unexpected global index: " + Twine(Global.Index));
|
|
return;
|
|
}
|
|
++ExpectedIndex;
|
|
writeUint8(OS, Global.Type);
|
|
writeUint8(OS, Global.Mutable);
|
|
writeInitExpr(OS, Global.InitExpr);
|
|
}
|
|
}
|
|
|
|
void WasmWriter::writeSectionContent(raw_ostream &OS,
|
|
WasmYAML::ElemSection &Section) {
|
|
encodeULEB128(Section.Segments.size(), OS);
|
|
for (auto &Segment : Section.Segments) {
|
|
encodeULEB128(Segment.Flags, OS);
|
|
if (Segment.Flags & wasm::WASM_ELEM_SEGMENT_HAS_TABLE_NUMBER)
|
|
encodeULEB128(Segment.TableNumber, OS);
|
|
|
|
writeInitExpr(OS, Segment.Offset);
|
|
|
|
if (Segment.Flags & wasm::WASM_ELEM_SEGMENT_MASK_HAS_ELEM_KIND) {
|
|
// We only support active function table initializers, for which the elem
|
|
// kind is specified to be written as 0x00 and interpreted to mean
|
|
// "funcref".
|
|
if (Segment.ElemKind != uint32_t(wasm::ValType::FUNCREF)) {
|
|
reportError("unexpected elemkind: " + Twine(Segment.ElemKind));
|
|
return;
|
|
}
|
|
const uint8_t ElemKind = 0;
|
|
writeUint8(OS, ElemKind);
|
|
}
|
|
|
|
encodeULEB128(Segment.Functions.size(), OS);
|
|
for (auto &Function : Segment.Functions)
|
|
encodeULEB128(Function, OS);
|
|
}
|
|
}
|
|
|
|
void 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) {
|
|
reportError("unexpected function index: " + Twine(Func.Index));
|
|
return;
|
|
}
|
|
++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;
|
|
}
|
|
}
|
|
|
|
void 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_DATA_SEGMENT_HAS_MEMINDEX)
|
|
encodeULEB128(Segment.MemoryIndex, OS);
|
|
if ((Segment.InitFlags & wasm::WASM_DATA_SEGMENT_IS_PASSIVE) == 0)
|
|
writeInitExpr(OS, Segment.Offset);
|
|
encodeULEB128(Segment.Content.binary_size(), OS);
|
|
Segment.Content.writeAsBinary(OS);
|
|
}
|
|
}
|
|
|
|
void WasmWriter::writeSectionContent(raw_ostream &OS,
|
|
WasmYAML::DataCountSection &Section) {
|
|
encodeULEB128(Section.Count, OS);
|
|
}
|
|
|
|
void 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 = cast<WasmYAML::CustomSection>(&Sec);
|
|
writeStringRef(("reloc." + CustomSection->Name).str(), OS);
|
|
break;
|
|
}
|
|
default:
|
|
llvm_unreachable("not yet implemented");
|
|
}
|
|
|
|
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_LEB64:
|
|
case wasm::R_WASM_MEMORY_ADDR_SLEB:
|
|
case wasm::R_WASM_MEMORY_ADDR_SLEB64:
|
|
case wasm::R_WASM_MEMORY_ADDR_I32:
|
|
case wasm::R_WASM_MEMORY_ADDR_I64:
|
|
case wasm::R_WASM_FUNCTION_OFFSET_I32:
|
|
case wasm::R_WASM_FUNCTION_OFFSET_I64:
|
|
case wasm::R_WASM_SECTION_OFFSET_I32:
|
|
encodeSLEB128(Reloc.Addend, OS);
|
|
break;
|
|
}
|
|
}
|
|
}
|
|
|
|
bool 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)) {
|
|
reportError("out of order section type: " + Twine(Sec->Type));
|
|
return false;
|
|
}
|
|
encodeULEB128(Sec->Type, OS);
|
|
std::string OutString;
|
|
raw_string_ostream StringStream(OutString);
|
|
if (auto S = dyn_cast<WasmYAML::CustomSection>(Sec.get()))
|
|
writeSectionContent(StringStream, *S);
|
|
else if (auto S = dyn_cast<WasmYAML::TypeSection>(Sec.get()))
|
|
writeSectionContent(StringStream, *S);
|
|
else if (auto S = dyn_cast<WasmYAML::ImportSection>(Sec.get()))
|
|
writeSectionContent(StringStream, *S);
|
|
else if (auto S = dyn_cast<WasmYAML::FunctionSection>(Sec.get()))
|
|
writeSectionContent(StringStream, *S);
|
|
else if (auto S = dyn_cast<WasmYAML::TableSection>(Sec.get()))
|
|
writeSectionContent(StringStream, *S);
|
|
else if (auto S = dyn_cast<WasmYAML::MemorySection>(Sec.get()))
|
|
writeSectionContent(StringStream, *S);
|
|
else if (auto S = dyn_cast<WasmYAML::EventSection>(Sec.get()))
|
|
writeSectionContent(StringStream, *S);
|
|
else if (auto S = dyn_cast<WasmYAML::GlobalSection>(Sec.get()))
|
|
writeSectionContent(StringStream, *S);
|
|
else if (auto S = dyn_cast<WasmYAML::ExportSection>(Sec.get()))
|
|
writeSectionContent(StringStream, *S);
|
|
else if (auto S = dyn_cast<WasmYAML::StartSection>(Sec.get()))
|
|
writeSectionContent(StringStream, *S);
|
|
else if (auto S = dyn_cast<WasmYAML::ElemSection>(Sec.get()))
|
|
writeSectionContent(StringStream, *S);
|
|
else if (auto S = dyn_cast<WasmYAML::CodeSection>(Sec.get()))
|
|
writeSectionContent(StringStream, *S);
|
|
else if (auto S = dyn_cast<WasmYAML::DataSection>(Sec.get()))
|
|
writeSectionContent(StringStream, *S);
|
|
else if (auto S = dyn_cast<WasmYAML::DataCountSection>(Sec.get()))
|
|
writeSectionContent(StringStream, *S);
|
|
else
|
|
reportError("unknown section type: " + Twine(Sec->Type));
|
|
|
|
if (HasError)
|
|
return false;
|
|
|
|
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 true;
|
|
}
|
|
|
|
namespace llvm {
|
|
namespace yaml {
|
|
|
|
bool yaml2wasm(WasmYAML::Object &Doc, raw_ostream &Out, ErrorHandler EH) {
|
|
WasmWriter Writer(Doc, EH);
|
|
return Writer.writeWasm(Out);
|
|
}
|
|
|
|
} // namespace yaml
|
|
} // namespace llvm
|