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//===- InputFiles.h ---------------------------------------------*- C++ -*-===//
//
// 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
//
//===----------------------------------------------------------------------===//
#ifndef LLD_WASM_INPUT_FILES_H
#define LLD_WASM_INPUT_FILES_H
#include "Symbols.h"
#include "lld/Common/LLVM.h"
#include "llvm/ADT/DenseMap.h"
#include "llvm/ADT/DenseSet.h"
#include "llvm/LTO/LTO.h"
#include "llvm/Object/Archive.h"
#include "llvm/Object/Wasm.h"
#include "llvm/Support/MemoryBuffer.h"
#include <vector>
namespace llvm {
class TarWriter;
}
namespace lld {
namespace wasm {
class InputChunk;
class InputFunction;
class InputSegment;
class InputGlobal;
class InputEvent;
class InputSection;
// If --reproduce option is given, all input files are written
// to this tar archive.
extern std::unique_ptr<llvm::TarWriter> tar;
class InputFile {
public:
enum Kind {
ObjectKind,
SharedKind,
ArchiveKind,
BitcodeKind,
};
virtual ~InputFile() {}
// Returns the filename.
StringRef getName() const { return mb.getBufferIdentifier(); }
Kind kind() const { return fileKind; }
// An archive file name if this file is created from an archive.
std::string archiveName;
ArrayRef<Symbol *> getSymbols() const { return symbols; }
MutableArrayRef<Symbol *> getMutableSymbols() { return symbols; }
protected:
InputFile(Kind k, MemoryBufferRef m) : mb(m), fileKind(k) {}
MemoryBufferRef mb;
// List of all symbols referenced or defined by this file.
std::vector<Symbol *> symbols;
private:
const Kind fileKind;
};
// .a file (ar archive)
class ArchiveFile : public InputFile {
public:
explicit ArchiveFile(MemoryBufferRef m) : InputFile(ArchiveKind, m) {}
static bool classof(const InputFile *f) { return f->kind() == ArchiveKind; }
void addMember(const llvm::object::Archive::Symbol *sym);
void parse();
private:
std::unique_ptr<llvm::object::Archive> file;
llvm::DenseSet<uint64_t> seen;
};
// .o file (wasm object file)
class ObjFile : public InputFile {
public:
explicit ObjFile(MemoryBufferRef m, StringRef archiveName)
: InputFile(ObjectKind, m) {
this->archiveName = std::string(archiveName);
}
static bool classof(const InputFile *f) { return f->kind() == ObjectKind; }
void parse(bool ignoreComdats = false);
// Returns the underlying wasm file.
const WasmObjectFile *getWasmObj() const { return wasmObj.get(); }
void dumpInfo() const;
uint32_t calcNewIndex(const WasmRelocation &reloc) const;
uint64_t calcNewValue(const WasmRelocation &reloc) const;
uint64_t calcNewAddend(const WasmRelocation &reloc) const;
uint64_t calcExpectedValue(const WasmRelocation &reloc) const;
Symbol *getSymbol(const WasmRelocation &reloc) const {
return symbols[reloc.Index];
};
const WasmSection *codeSection = nullptr;
const WasmSection *dataSection = nullptr;
// Maps input type indices to output type indices
std::vector<uint32_t> typeMap;
std::vector<bool> typeIsUsed;
// Maps function indices to table indices
std::vector<uint32_t> tableEntries;
std::vector<uint32_t> tableEntriesRel;
std::vector<bool> keptComdats;
std::vector<InputSegment *> segments;
std::vector<InputFunction *> functions;
std::vector<InputGlobal *> globals;
std::vector<InputEvent *> events;
std::vector<InputSection *> customSections;
llvm::DenseMap<uint32_t, InputSection *> customSectionsByIndex;
Symbol *getSymbol(uint32_t index) const { return symbols[index]; }
FunctionSymbol *getFunctionSymbol(uint32_t index) const;
DataSymbol *getDataSymbol(uint32_t index) const;
GlobalSymbol *getGlobalSymbol(uint32_t index) const;
SectionSymbol *getSectionSymbol(uint32_t index) const;
EventSymbol *getEventSymbol(uint32_t index) const;
private:
Symbol *createDefined(const WasmSymbol &sym);
Symbol *createUndefined(const WasmSymbol &sym, bool isCalledDirectly);
bool isExcludedByComdat(InputChunk *chunk) const;
std::unique_ptr<WasmObjectFile> wasmObj;
};
// .so file.
class SharedFile : public InputFile {
public:
explicit SharedFile(MemoryBufferRef m) : InputFile(SharedKind, m) {}
static bool classof(const InputFile *f) { return f->kind() == SharedKind; }
};
// .bc file
class BitcodeFile : public InputFile {
public:
explicit BitcodeFile(MemoryBufferRef m, StringRef archiveName)
: InputFile(BitcodeKind, m) {
this->archiveName = std::string(archiveName);
}
static bool classof(const InputFile *f) { return f->kind() == BitcodeKind; }
void parse();
std::unique_ptr<llvm::lto::InputFile> obj;
// Set to true once LTO is complete in order prevent further bitcode objects
// being added.
static bool doneLTO;
};
inline bool isBitcode(MemoryBufferRef mb) {
return identify_magic(mb.getBuffer()) == llvm::file_magic::bitcode;
}
// Will report a fatal() error if the input buffer is not a valid bitcode
// or wasm object file.
InputFile *createObjectFile(MemoryBufferRef mb, StringRef archiveName = "");
// Opens a given file.
llvm::Optional<MemoryBufferRef> readFile(StringRef path);
} // namespace wasm
std::string toString(const wasm::InputFile *file);
} // namespace lld
#endif
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