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external/llvm/tools/llvm-readobj/WasmDumper.cpp
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external/llvm/tools/llvm-readobj/WasmDumper.cpp
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//===-- WasmDumper.cpp - Wasm-specific object file dumper -----------------===//
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//
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// The LLVM Compiler Infrastructure
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//
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// This file is distributed under the University of Illinois Open Source
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// License. See LICENSE.TXT for details.
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//
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//===----------------------------------------------------------------------===//
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//
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// This file implements the Wasm-specific dumper for llvm-readobj.
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//
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//===----------------------------------------------------------------------===//
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#include "Error.h"
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#include "ObjDumper.h"
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#include "llvm-readobj.h"
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#include "llvm/Object/Wasm.h"
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#include "llvm/Support/ScopedPrinter.h"
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using namespace llvm;
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using namespace object;
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namespace {
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static const EnumEntry<unsigned> WasmSymbolTypes[] = {
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#define ENUM_ENTRY(X) { #X, static_cast<unsigned>(WasmSymbol::SymbolType::X) }
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ENUM_ENTRY(FUNCTION_IMPORT),
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ENUM_ENTRY(FUNCTION_EXPORT),
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ENUM_ENTRY(GLOBAL_IMPORT),
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ENUM_ENTRY(GLOBAL_EXPORT),
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ENUM_ENTRY(DEBUG_FUNCTION_NAME),
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#undef ENUM_ENTRY
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};
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static const EnumEntry<uint32_t> WasmSectionTypes[] = {
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#define ENUM_ENTRY(X) { #X, wasm::WASM_SEC_##X }
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ENUM_ENTRY(CUSTOM),
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ENUM_ENTRY(TYPE),
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ENUM_ENTRY(IMPORT),
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ENUM_ENTRY(FUNCTION),
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ENUM_ENTRY(TABLE),
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ENUM_ENTRY(MEMORY),
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ENUM_ENTRY(GLOBAL),
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ENUM_ENTRY(EXPORT),
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ENUM_ENTRY(START),
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ENUM_ENTRY(ELEM),
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ENUM_ENTRY(CODE),
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ENUM_ENTRY(DATA),
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#undef ENUM_ENTRY
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};
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class WasmDumper : public ObjDumper {
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public:
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WasmDumper(const WasmObjectFile *Obj, ScopedPrinter &Writer)
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: ObjDumper(Writer), Obj(Obj) {}
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void printFileHeaders() override;
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void printSections() override;
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void printRelocations() override;
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void printSymbols() override;
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void printDynamicSymbols() override { llvm_unreachable("unimplemented"); }
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void printUnwindInfo() override { llvm_unreachable("unimplemented"); }
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void printStackMap() const override { llvm_unreachable("unimplemented"); }
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protected:
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void printSymbol(const SymbolRef &Sym);
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void printRelocation(const SectionRef &Section, const RelocationRef &Reloc);
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private:
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const WasmObjectFile *Obj;
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};
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void WasmDumper::printFileHeaders() {
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W.printHex("Version", Obj->getHeader().Version);
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}
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void WasmDumper::printRelocation(const SectionRef &Section,
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const RelocationRef &Reloc) {
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SmallString<64> RelocTypeName;
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uint64_t RelocType = Reloc.getType();
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Reloc.getTypeName(RelocTypeName);
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const wasm::WasmRelocation &WasmReloc = Obj->getWasmRelocation(Reloc);
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bool HasAddend = false;
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switch (RelocType) {
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case wasm::R_WEBASSEMBLY_MEMORY_ADDR_LEB:
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case wasm::R_WEBASSEMBLY_MEMORY_ADDR_SLEB:
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case wasm::R_WEBASSEMBLY_MEMORY_ADDR_I32:
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HasAddend = true;
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break;
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default:
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break;
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}
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if (opts::ExpandRelocs) {
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DictScope Group(W, "Relocation");
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W.printNumber("Type", RelocTypeName, RelocType);
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W.printHex("Offset", Reloc.getOffset());
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W.printHex("Index", WasmReloc.Index);
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if (HasAddend)
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W.printNumber("Addend", WasmReloc.Addend);
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} else {
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raw_ostream& OS = W.startLine();
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OS << W.hex(Reloc.getOffset()) << " " << RelocTypeName << "["
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<< WasmReloc.Index << "]";
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if (HasAddend)
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OS << " " << WasmReloc.Addend;
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OS << "\n";
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}
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}
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void WasmDumper::printRelocations() {
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ListScope D(W, "Relocations");
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int SectionNumber = 0;
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for (const SectionRef &Section : Obj->sections()) {
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bool PrintedGroup = false;
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StringRef Name;
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error(Section.getName(Name));
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++SectionNumber;
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for (const RelocationRef &Reloc : Section.relocations()) {
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if (!PrintedGroup) {
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W.startLine() << "Section (" << SectionNumber << ") " << Name << " {\n";
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W.indent();
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PrintedGroup = true;
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}
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printRelocation(Section, Reloc);
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}
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if (PrintedGroup) {
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W.unindent();
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W.startLine() << "}\n";
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}
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}
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}
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void WasmDumper::printSymbols() {
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ListScope Group(W, "Symbols");
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for (const SymbolRef &Symbol : Obj->symbols())
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printSymbol(Symbol);
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}
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void WasmDumper::printSections() {
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ListScope Group(W, "Sections");
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for (const SectionRef &Section : Obj->sections()) {
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const WasmSection &WasmSec = Obj->getWasmSection(Section);
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DictScope SectionD(W, "Section");
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W.printEnum("Type", WasmSec.Type, makeArrayRef(WasmSectionTypes));
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W.printNumber("Size", static_cast<uint64_t>(WasmSec.Content.size()));
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W.printNumber("Offset", WasmSec.Offset);
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switch (WasmSec.Type) {
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case wasm::WASM_SEC_CUSTOM:
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W.printString("Name", WasmSec.Name);
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if (WasmSec.Name == "linking") {
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const wasm::WasmLinkingData &LinkingData = Obj->linkingData();
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W.printNumber("DataSize", LinkingData.DataSize);
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if (!LinkingData.InitFunctions.empty()) {
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ListScope Group(W, "InitFunctions");
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for (const wasm::WasmInitFunc &F: LinkingData.InitFunctions)
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W.startLine() << F.FunctionIndex << " (priority=" << F.Priority
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<< ")\n";
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}
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}
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break;
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case wasm::WASM_SEC_DATA: {
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ListScope Group(W, "Segments");
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for (const WasmSegment &Segment : Obj->dataSegments()) {
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const wasm::WasmDataSegment& Seg = Segment.Data;
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DictScope Group(W, "Segment");
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if (!Seg.Name.empty())
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W.printString("Name", Seg.Name);
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W.printNumber("Size", static_cast<uint64_t>(Seg.Content.size()));
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if (Seg.Offset.Opcode == wasm::WASM_OPCODE_I32_CONST)
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W.printNumber("Offset", Seg.Offset.Value.Int32);
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}
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break;
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}
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case wasm::WASM_SEC_MEMORY:
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ListScope Group(W, "Memories");
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for (const wasm::WasmLimits &Memory : Obj->memories()) {
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DictScope Group(W, "Memory");
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W.printNumber("InitialPages", Memory.Initial);
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if (Memory.Flags & wasm::WASM_LIMITS_FLAG_HAS_MAX) {
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W.printNumber("MaxPages", WasmSec.Offset);
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}
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}
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break;
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}
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if (opts::SectionRelocations) {
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ListScope D(W, "Relocations");
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for (const RelocationRef &Reloc : Section.relocations())
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printRelocation(Section, Reloc);
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}
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if (opts::SectionData) {
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W.printBinaryBlock("SectionData", WasmSec.Content);
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}
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}
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}
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void WasmDumper::printSymbol(const SymbolRef &Sym) {
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DictScope D(W, "Symbol");
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WasmSymbol Symbol = Obj->getWasmSymbol(Sym.getRawDataRefImpl());
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W.printString("Name", Symbol.Name);
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W.printEnum("Type", static_cast<unsigned>(Symbol.Type), makeArrayRef(WasmSymbolTypes));
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W.printHex("Flags", Symbol.Flags);
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}
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}
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namespace llvm {
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std::error_code createWasmDumper(const object::ObjectFile *Obj,
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ScopedPrinter &Writer,
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std::unique_ptr<ObjDumper> &Result) {
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const WasmObjectFile *WasmObj = dyn_cast<WasmObjectFile>(Obj);
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assert(WasmObj && "createWasmDumper called with non-wasm object");
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Result.reset(new WasmDumper(WasmObj, Writer));
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return readobj_error::success;
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}
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} // namespace llvm
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