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     ErrorOr<Module *> ModuleOrErr = getLazyBitcodeModule(Buffer, Context);
40     if (error_code EC = ModuleOrErr.getError()) {
41       Err = SMDiagnostic(Buffer->getBufferIdentifier(), SourceMgr::DK_Error,
42                          EC.message());
43       // ParseBitcodeFile does not take ownership of the Buffer in the
44       // case of an error.
45       delete Buffer;
46       return NULL;
47     }
48     return ModuleOrErr.get();
49   }
50 
51   return ParseAssembly(Buffer, 0, Err, Context);
52 }
53 
54 Module *llvm::getLazyIRFileModule(const std::string &Filename, SMDiagnostic &Err,
55                                   LLVMContext &Context) {
56   OwningPtr<MemoryBuffer> File;
57   if (error_code ec = MemoryBuffer::getFileOrSTDIN(Filename, File)) {
58     Err = SMDiagnostic(Filename, SourceMgr::DK_Error,
59                        "Could not open input file: " + ec.message());
60     return 0;
61   }
62 
63   return getLazyIRModule(File.take(), Err, Context);
64 }
65 
66 Module *llvm::ParseIR(MemoryBuffer *Buffer, SMDiagnostic &Err,
67                       LLVMContext &Context) {
68   NamedRegionTimer T(TimeIRParsingName, TimeIRParsingGroupName,
69                      TimePassesIsEnabled);
70   if (isBitcode((const unsigned char *)Buffer->getBufferStart(),
71                 (const unsigned char *)Buffer->getBufferEnd())) {
72     ErrorOr<Module *> ModuleOrErr = parseBitcodeFile(Buffer, Context);
73     Module *M = 0;
74     if (error_code EC = ModuleOrErr.getError())
75       Err = SMDiagnostic(Buffer->getBufferIdentifier(), SourceMgr::DK_Error,
76                          EC.message());
77     else
78       M = ModuleOrErr.get();
79     // parseBitcodeFile does not take ownership of the Buffer.
80     delete Buffer;
81     return M;
82   }
83 
84   return ParseAssembly(Buffer, 0, Err, Context);
85 }
86 
87 Module *llvm::ParseIRFile(const std::string &Filename, SMDiagnostic &Err,
88                           LLVMContext &Context) {
89   OwningPtr<MemoryBuffer> File;
90   if (error_code ec = MemoryBuffer::getFileOrSTDIN(Filename, File)) {
91     Err = SMDiagnostic(Filename, SourceMgr::DK_Error,
92                        "Could not open input file: " + ec.message());
93     return 0;
94   }
95 
96   return ParseIR(File.take(), Err, Context);
97 }
98 
99 //===----------------------------------------------------------------------===//
100 // C API.
101 //===----------------------------------------------------------------------===//
102 
103 LLVMBool LLVMParseIRInContext(LLVMContextRef ContextRef,
104                               LLVMMemoryBufferRef MemBuf, LLVMModuleRef *OutM,
105                               char **OutMessage) {
106   SMDiagnostic Diag;
107 
108   *OutM = wrap(ParseIR(unwrap(MemBuf), Diag, *unwrap(ContextRef)));
109 
110   if(!*OutM) {
111     if (OutMessage) {
112       std::string buf;
113       raw_string_ostream os(buf);
114 
115       Diag.print(NULL, os, false);
116       os.flush();
117 
118       *OutMessage = strdup(buf.c_str());
119     }
120     return 1;
121   }
122 
123   return 0;
124 }
125