0e60ca7b32fcca90d054fbf62cb9985b66ae65a0
[oota-llvm.git] / lib / IRReader / IRReader.cpp
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/ADT/OwningPtr.h"
14 #include "llvm/AsmParser/Parser.h"
15 #include "llvm/Bitcode/ReaderWriter.h"
16 #include "llvm/IR/LLVMContext.h"
17 #include "llvm/IR/Module.h"
18 #include "llvm/Support/MemoryBuffer.h"
19 #include "llvm/Support/SourceMgr.h"
20 #include "llvm/Support/Timer.h"
21 #include "llvm/Support/raw_ostream.h"
22 #include "llvm/Support/system_error.h"
23
24 using namespace llvm;
25
26 namespace llvm {
27   extern bool TimePassesIsEnabled;
28 }
29
30 static const char *const TimeIRParsingGroupName = "LLVM IR Parsing";
31 static const char *const TimeIRParsingName = "Parse IR";
32
33
34 Module *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
53 Module *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
65 Module *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
84 Module *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
100 LLVMBool 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 }