IRReader.cpp revision 36b56886974eae4f9c5ebc96befd3e7bfe5de338 
1//===---- IRReader.cpp - Reader for LLVM IR files -------------------------===//
2//
3//                     The LLVM Compiler Infrastructure
4//
5// This file is distributed under the University of Illinois Open Source
6// License. See LICENSE.TXT for details.
7//
8//===----------------------------------------------------------------------===//
9
10#include "llvm/IRReader/IRReader.h"
11#include "llvm-c/Core.h"
12#include "llvm-c/IRReader.h"
13#include "llvm/AsmParser/Parser.h"
14#include "llvm/Bitcode/ReaderWriter.h"
15#include "llvm/IR/LLVMContext.h"
16#include "llvm/IR/Module.h"
17#include "llvm/Support/MemoryBuffer.h"
18#include "llvm/Support/SourceMgr.h"
19#include "llvm/Support/Timer.h"
20#include "llvm/Support/raw_ostream.h"
21#include "llvm/Support/system_error.h"
22
23using namespace llvm;
24
25namespace llvm {
26  extern bool TimePassesIsEnabled;
27}
28
29static const char *const TimeIRParsingGroupName = "LLVM IR Parsing";
30static const char *const TimeIRParsingName = "Parse IR";
31
32
33Module *llvm::getLazyIRModule(MemoryBuffer *Buffer, SMDiagnostic &Err,
34                              LLVMContext &Context) {
35  if (isBitcode((const unsigned char *)Buffer->getBufferStart(),
36                (const unsigned char *)Buffer->getBufferEnd())) {
37    std::string ErrMsg;
38    ErrorOr<Module *> ModuleOrErr = getLazyBitcodeModule(Buffer, Context);
39    if (error_code EC = ModuleOrErr.getError()) {
40      Err = SMDiagnostic(Buffer->getBufferIdentifier(), SourceMgr::DK_Error,
41                         EC.message());
42      // ParseBitcodeFile does not take ownership of the Buffer in the
43      // case of an error.
44      delete Buffer;
45      return NULL;
46    }
47    return ModuleOrErr.get();
48  }
49
50  return ParseAssembly(Buffer, 0, Err, Context);
51}
52
53Module *llvm::getLazyIRFileModule(const std::string &Filename, SMDiagnostic &Err,
54                                  LLVMContext &Context) {
55  std::unique_ptr<MemoryBuffer> File;
56  if (error_code ec = MemoryBuffer::getFileOrSTDIN(Filename, File)) {
57    Err = SMDiagnostic(Filename, SourceMgr::DK_Error,
58                       "Could not open input file: " + ec.message());
59    return 0;
60  }
61
62  return getLazyIRModule(File.release(), Err, Context);
63}
64
65Module *llvm::ParseIR(MemoryBuffer *Buffer, SMDiagnostic &Err,
66                      LLVMContext &Context) {
67  NamedRegionTimer T(TimeIRParsingName, TimeIRParsingGroupName,
68                     TimePassesIsEnabled);
69  if (isBitcode((const unsigned char *)Buffer->getBufferStart(),
70                (const unsigned char *)Buffer->getBufferEnd())) {
71    ErrorOr<Module *> ModuleOrErr = parseBitcodeFile(Buffer, Context);
72    Module *M = 0;
73    if (error_code EC = ModuleOrErr.getError())
74      Err = SMDiagnostic(Buffer->getBufferIdentifier(), SourceMgr::DK_Error,
75                         EC.message());
76    else
77      M = ModuleOrErr.get();
78    // parseBitcodeFile does not take ownership of the Buffer.
79    delete Buffer;
80    return M;
81  }
82
83  return ParseAssembly(Buffer, 0, Err, Context);
84}
85
86Module *llvm::ParseIRFile(const std::string &Filename, SMDiagnostic &Err,
87                          LLVMContext &Context) {
88  std::unique_ptr<MemoryBuffer> File;
89  if (error_code ec = MemoryBuffer::getFileOrSTDIN(Filename, File)) {
90    Err = SMDiagnostic(Filename, SourceMgr::DK_Error,
91                       "Could not open input file: " + ec.message());
92    return 0;
93  }
94
95  return ParseIR(File.release(), Err, Context);
96}
97
98//===----------------------------------------------------------------------===//
99// C API.
100//===----------------------------------------------------------------------===//
101
102LLVMBool LLVMParseIRInContext(LLVMContextRef ContextRef,
103                              LLVMMemoryBufferRef MemBuf, LLVMModuleRef *OutM,
104                              char **OutMessage) {
105  SMDiagnostic Diag;
106
107  *OutM = wrap(ParseIR(unwrap(MemBuf), Diag, *unwrap(ContextRef)));
108
109  if(!*OutM) {
110    if (OutMessage) {
111      std::string buf;
112      raw_string_ostream os(buf);
113
114      Diag.print(NULL, os, false);
115      os.flush();
116
117      *OutMessage = strdup(buf.c_str());
118    }
119    return 1;
120  }
121
122  return 0;
123}
124