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llvm-project/llvm/tools/llvm-readobj/WasmDumper.cpp

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//===-- WasmDumper.cpp - Wasm-specific object file dumper -----------------===//
//
// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
// See https://llvm.org/LICENSE.txt for license information.
// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
//
//===----------------------------------------------------------------------===//
//
// This file implements the Wasm-specific dumper for llvm-readobj.
//
//===----------------------------------------------------------------------===//
#include "Error.h"
#include "ObjDumper.h"
#include "llvm-readobj.h"
#include "llvm/Object/Wasm.h"
#include "llvm/Support/ScopedPrinter.h"
using namespace llvm;
using namespace object;
namespace {
static const EnumEntry<unsigned> WasmSymbolTypes[] = {
#define ENUM_ENTRY(X) \
{ #X, wasm::WASM_SYMBOL_TYPE_##X }
ENUM_ENTRY(FUNCTION), ENUM_ENTRY(DATA), ENUM_ENTRY(GLOBAL),
ENUM_ENTRY(SECTION), ENUM_ENTRY(EVENT),
#undef ENUM_ENTRY
};
static const EnumEntry<uint32_t> WasmSectionTypes[] = {
#define ENUM_ENTRY(X) \
{ #X, wasm::WASM_SEC_##X }
ENUM_ENTRY(CUSTOM), ENUM_ENTRY(TYPE), ENUM_ENTRY(IMPORT),
ENUM_ENTRY(FUNCTION), ENUM_ENTRY(TABLE), ENUM_ENTRY(MEMORY),
ENUM_ENTRY(GLOBAL), ENUM_ENTRY(EVENT), ENUM_ENTRY(EXPORT),
ENUM_ENTRY(START), ENUM_ENTRY(ELEM), ENUM_ENTRY(CODE),
ENUM_ENTRY(DATA), ENUM_ENTRY(DATACOUNT),
#undef ENUM_ENTRY
};
static const EnumEntry<unsigned> WasmSymbolFlags[] = {
#define ENUM_ENTRY(X) \
{ #X, wasm::WASM_SYMBOL_##X }
ENUM_ENTRY(BINDING_GLOBAL),
ENUM_ENTRY(BINDING_WEAK),
ENUM_ENTRY(BINDING_LOCAL),
ENUM_ENTRY(VISIBILITY_DEFAULT),
ENUM_ENTRY(VISIBILITY_HIDDEN),
ENUM_ENTRY(UNDEFINED),
ENUM_ENTRY(EXPORTED),
ENUM_ENTRY(EXPLICIT_NAME),
ENUM_ENTRY(NO_STRIP),
#undef ENUM_ENTRY
};
class WasmDumper : public ObjDumper {
public:
WasmDumper(const WasmObjectFile *Obj, ScopedPrinter &Writer)
: ObjDumper(Writer), Obj(Obj) {}
void printFileHeaders() override;
void printSectionHeaders() override;
void printRelocations() override;
void printUnwindInfo() override { llvm_unreachable("unimplemented"); }
void printStackMap() const override { llvm_unreachable("unimplemented"); }
protected:
void printSymbol(const SymbolRef &Sym);
void printRelocation(const SectionRef &Section, const RelocationRef &Reloc);
private:
void printSymbols() override;
void printDynamicSymbols() override { llvm_unreachable("unimplemented"); }
const WasmObjectFile *Obj;
};
void WasmDumper::printFileHeaders() {
W.printHex("Version", Obj->getHeader().Version);
}
void WasmDumper::printRelocation(const SectionRef &Section,
const RelocationRef &Reloc) {
SmallString<64> RelocTypeName;
uint64_t RelocType = Reloc.getType();
Reloc.getTypeName(RelocTypeName);
const wasm::WasmRelocation &WasmReloc = Obj->getWasmRelocation(Reloc);
StringRef SymName;
symbol_iterator SI = Reloc.getSymbol();
if (SI != Obj->symbol_end())
SymName = unwrapOrError(Obj->getFileName(), SI->getName());
bool HasAddend = false;
switch (RelocType) {
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:
HasAddend = true;
break;
default:
break;
}
if (opts::ExpandRelocs) {
DictScope Group(W, "Relocation");
W.printNumber("Type", RelocTypeName, RelocType);
W.printHex("Offset", Reloc.getOffset());
if (!SymName.empty())
W.printString("Symbol", SymName);
else
W.printHex("Index", WasmReloc.Index);
if (HasAddend)
W.printNumber("Addend", WasmReloc.Addend);
} else {
raw_ostream &OS = W.startLine();
OS << W.hex(Reloc.getOffset()) << " " << RelocTypeName << " ";
if (!SymName.empty())
OS << SymName;
else
OS << WasmReloc.Index;
if (HasAddend)
OS << " " << WasmReloc.Addend;
OS << "\n";
}
}
void WasmDumper::printRelocations() {
ListScope D(W, "Relocations");
int SectionNumber = 0;
for (const SectionRef &Section : Obj->sections()) {
bool PrintedGroup = false;
StringRef Name = unwrapOrError(Obj->getFileName(), Section.getName());
++SectionNumber;
for (const RelocationRef &Reloc : Section.relocations()) {
if (!PrintedGroup) {
W.startLine() << "Section (" << SectionNumber << ") " << Name << " {\n";
W.indent();
PrintedGroup = true;
}
printRelocation(Section, Reloc);
}
if (PrintedGroup) {
W.unindent();
W.startLine() << "}\n";
}
}
}
void WasmDumper::printSymbols() {
ListScope Group(W, "Symbols");
for (const SymbolRef &Symbol : Obj->symbols())
printSymbol(Symbol);
}
void WasmDumper::printSectionHeaders() {
ListScope Group(W, "Sections");
for (const SectionRef &Section : Obj->sections()) {
const WasmSection &WasmSec = Obj->getWasmSection(Section);
DictScope SectionD(W, "Section");
W.printEnum("Type", WasmSec.Type, makeArrayRef(WasmSectionTypes));
W.printNumber("Size", static_cast<uint64_t>(WasmSec.Content.size()));
W.printNumber("Offset", WasmSec.Offset);
switch (WasmSec.Type) {
case wasm::WASM_SEC_CUSTOM:
W.printString("Name", WasmSec.Name);
if (WasmSec.Name == "linking") {
const wasm::WasmLinkingData &LinkingData = Obj->linkingData();
if (!LinkingData.InitFunctions.empty()) {
ListScope Group(W, "InitFunctions");
for (const wasm::WasmInitFunc &F : LinkingData.InitFunctions)
W.startLine() << F.Symbol << " (priority=" << F.Priority << ")\n";
}
}
break;
case wasm::WASM_SEC_DATA: {
ListScope Group(W, "Segments");
for (const WasmSegment &Segment : Obj->dataSegments()) {
const wasm::WasmDataSegment &Seg = Segment.Data;
DictScope Group(W, "Segment");
if (!Seg.Name.empty())
W.printString("Name", Seg.Name);
W.printNumber("Size", static_cast<uint64_t>(Seg.Content.size()));
if (Seg.Offset.Opcode == wasm::WASM_OPCODE_I32_CONST)
W.printNumber("Offset", Seg.Offset.Value.Int32);
}
break;
}
case wasm::WASM_SEC_MEMORY:
ListScope Group(W, "Memories");
for (const wasm::WasmLimits &Memory : Obj->memories()) {
DictScope Group(W, "Memory");
W.printNumber("InitialPages", Memory.Initial);
if (Memory.Flags & wasm::WASM_LIMITS_FLAG_HAS_MAX) {
W.printNumber("MaxPages", WasmSec.Offset);
}
}
break;
}
if (opts::SectionRelocations) {
ListScope D(W, "Relocations");
for (const RelocationRef &Reloc : Section.relocations())
printRelocation(Section, Reloc);
}
if (opts::SectionData) {
W.printBinaryBlock("SectionData", WasmSec.Content);
}
}
}
void WasmDumper::printSymbol(const SymbolRef &Sym) {
DictScope D(W, "Symbol");
WasmSymbol Symbol = Obj->getWasmSymbol(Sym.getRawDataRefImpl());
W.printString("Name", Symbol.Info.Name);
W.printEnum("Type", Symbol.Info.Kind, makeArrayRef(WasmSymbolTypes));
W.printFlags("Flags", Symbol.Info.Flags, makeArrayRef(WasmSymbolFlags));
if (Symbol.Info.Flags & wasm::WASM_SYMBOL_UNDEFINED) {
if (Symbol.Info.ImportName) {
W.printString("ImportName", *Symbol.Info.ImportName);
}
if (Symbol.Info.ImportModule) {
W.printString("ImportModule", *Symbol.Info.ImportModule);
}
}
if (Symbol.Info.Kind != wasm::WASM_SYMBOL_TYPE_DATA) {
W.printHex("ElementIndex", Symbol.Info.ElementIndex);
} else if (!(Symbol.Info.Flags & wasm::WASM_SYMBOL_UNDEFINED)) {
W.printHex("Offset", Symbol.Info.DataRef.Offset);
W.printHex("Segment", Symbol.Info.DataRef.Segment);
W.printHex("Size", Symbol.Info.DataRef.Size);
}
}
} // namespace
namespace llvm {
std::error_code createWasmDumper(const object::ObjectFile *Obj,
ScopedPrinter &Writer,
std::unique_ptr<ObjDumper> &Result) {
const auto *WasmObj = dyn_cast<WasmObjectFile>(Obj);
assert(WasmObj && "createWasmDumper called with non-wasm object");
Result.reset(new WasmDumper(WasmObj, Writer));
return readobj_error::success;
}
} // namespace llvm
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