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//===---- llvm/Support/IRReader.h - Reader for LLVM IR files ----*- C++ -*-===//
//
// The LLVM Compiler Infrastructure
//
// This file is distributed under the University of Illinois Open Source
// License. See LICENSE.TXT for details.
//
//===----------------------------------------------------------------------===//
//
// This file defines functions for reading LLVM IR. They support both
// Bitcode and Assembly, automatically detecting the input format.
//
// These functions must be defined in a header file in order to avoid
// library dependencies, since they reference both Bitcode and Assembly
// functions.
//
//===----------------------------------------------------------------------===//
#ifndef LLVM_SUPPORT_IRREADER_H
#define LLVM_SUPPORT_IRREADER_H
#include "llvm/Assembly/Parser.h"
#include "llvm/Bitcode/ReaderWriter.h"
#include "llvm/Support/MemoryBuffer.h"
#include "llvm/Support/SourceMgr.h"
#include "llvm/Support/system_error.h"
namespace llvm {
/// If the given MemoryBuffer holds a bitcode image, return a Module for it
/// which does lazy deserialization of function bodies. Otherwise, attempt to
/// parse it as LLVM Assembly and return a fully populated Module. This
/// function *always* takes ownership of the given MemoryBuffer.
inline Module *getLazyIRModule(MemoryBuffer *Buffer,
SMDiagnostic &Err,
LLVMContext &Context) {
if (isBitcode((const unsigned char *)Buffer->getBufferStart(),
(const unsigned char *)Buffer->getBufferEnd())) {
std::string ErrMsg;
Module *M = getLazyBitcodeModule(Buffer, Context, &ErrMsg);
if (M == 0) {
Err = SMDiagnostic(Buffer->getBufferIdentifier(), ErrMsg);
// ParseBitcodeFile does not take ownership of the Buffer in the
// case of an error.
delete Buffer;
}
return M;
}
return ParseAssembly(Buffer, 0, Err, Context);
}
/// If the given file holds a bitcode image, return a Module
/// for it which does lazy deserialization of function bodies. Otherwise,
/// attempt to parse it as LLVM Assembly and return a fully populated
/// Module.
inline Module *getLazyIRFileModule(const std::string &Filename,
SMDiagnostic &Err,
LLVMContext &Context) {
error_code ec;
MemoryBuffer *F = MemoryBuffer::getFileOrSTDIN(Filename.c_str(), ec);
if (F == 0) {
Err = SMDiagnostic(Filename,
"Could not open input file: " + ec.message());
return 0;
}
return getLazyIRModule(F, Err, Context);
}
/// If the given MemoryBuffer holds a bitcode image, return a Module
/// for it. Otherwise, attempt to parse it as LLVM Assembly and return
/// a Module for it. This function *always* takes ownership of the given
/// MemoryBuffer.
inline Module *ParseIR(MemoryBuffer *Buffer,
SMDiagnostic &Err,
LLVMContext &Context) {
if (isBitcode((const unsigned char *)Buffer->getBufferStart(),
(const unsigned char *)Buffer->getBufferEnd())) {
std::string ErrMsg;
Module *M = ParseBitcodeFile(Buffer, Context, &ErrMsg);
if (M == 0)
Err = SMDiagnostic(Buffer->getBufferIdentifier(), ErrMsg);
// ParseBitcodeFile does not take ownership of the Buffer.
delete Buffer;
return M;
}
return ParseAssembly(Buffer, 0, Err, Context);
}
/// If the given file holds a bitcode image, return a Module for it.
/// Otherwise, attempt to parse it as LLVM Assembly and return a Module
/// for it.
inline Module *ParseIRFile(const std::string &Filename,
SMDiagnostic &Err,
LLVMContext &Context) {
error_code ec;
MemoryBuffer *F = MemoryBuffer::getFileOrSTDIN(Filename.c_str(), ec);
if (F == 0) {
Err = SMDiagnostic(Filename,
"Could not open input file: " + ec.message());
return 0;
}
return ParseIR(F, Err, Context);
}
}
#endif
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