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