IRReader.cpp revision 263508 
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/ADT/OwningPtr.h"
12#include "llvm/Assembly/Parser.h"
13#include "llvm/Bitcode/ReaderWriter.h"
14#include "llvm/IR/LLVMContext.h"
15#include "llvm/IR/Module.h"
16#include "llvm/Support/MemoryBuffer.h"
17#include "llvm/Support/SourceMgr.h"
18#include "llvm/Support/system_error.h"
19#include "llvm/Support/Timer.h"
20#include "llvm/Support/raw_ostream.h"
21#include "llvm-c/Core.h"
22#include "llvm-c/IRReader.h"
23
24using namespace llvm;
25
26namespace llvm {
27  extern bool TimePassesIsEnabled;
28}
29
30static const char *const TimeIRParsingGroupName = "LLVM IR Parsing";
31static const char *const TimeIRParsingName = "Parse IR";
32
33
34Module *llvm::getLazyIRModule(MemoryBuffer *Buffer, SMDiagnostic &Err,
35                              LLVMContext &Context) {
36  if (isBitcode((const unsigned char *)Buffer->getBufferStart(),
37                (const unsigned char *)Buffer->getBufferEnd())) {
38    std::string ErrMsg;
39    Module *M = getLazyBitcodeModule(Buffer, Context, &ErrMsg);
40    if (M == 0) {
41      Err = SMDiagnostic(Buffer->getBufferIdentifier(), SourceMgr::DK_Error,
42                         ErrMsg);
43      // ParseBitcodeFile does not take ownership of the Buffer in the
44      // case of an error.
45      delete Buffer;
46    }
47    return M;
48  }
49
50  return ParseAssembly(Buffer, 0, Err, Context);
51}
52
53Module *llvm::getLazyIRFileModule(const std::string &Filename, SMDiagnostic &Err,
54                                  LLVMContext &Context) {
55  OwningPtr<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.take(), 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    std::string ErrMsg;
72    Module *M = ParseBitcodeFile(Buffer, Context, &ErrMsg);
73    if (M == 0)
74      Err = SMDiagnostic(Buffer->getBufferIdentifier(), SourceMgr::DK_Error,
75                         ErrMsg);
76    // ParseBitcodeFile does not take ownership of the Buffer.
77    delete Buffer;
78    return M;
79  }
80
81  return ParseAssembly(Buffer, 0, Err, Context);
82}
83
84Module *llvm::ParseIRFile(const std::string &Filename, SMDiagnostic &Err,
85                          LLVMContext &Context) {
86  OwningPtr<MemoryBuffer> File;
87  if (error_code ec = MemoryBuffer::getFileOrSTDIN(Filename, File)) {
88    Err = SMDiagnostic(Filename, SourceMgr::DK_Error,
89                       "Could not open input file: " + ec.message());
90    return 0;
91  }
92
93  return ParseIR(File.take(), Err, Context);
94}
95
96//===----------------------------------------------------------------------===//
97// C API.
98//===----------------------------------------------------------------------===//
99
100LLVMBool LLVMParseIRInContext(LLVMContextRef ContextRef,
101                              LLVMMemoryBufferRef MemBuf, LLVMModuleRef *OutM,
102                              char **OutMessage) {
103  SMDiagnostic Diag;
104
105  *OutM = wrap(ParseIR(unwrap(MemBuf), Diag, *unwrap(ContextRef)));
106
107  if(!*OutM) {
108    if (OutMessage) {
109      std::string buf;
110      raw_string_ostream os(buf);
111
112      Diag.print(NULL, os, false);
113      os.flush();
114
115      *OutMessage = strdup(buf.c_str());
116    }
117    return 1;
118  }
119
120  return 0;
121}
122