• Home
  • Line#
  • Scopes#
  • Navigate#
  • Raw
  • Download
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 <system_error>
22 
23 using namespace llvm;
24 
25 namespace llvm {
26   extern bool TimePassesIsEnabled;
27 }
28 
29 static const char *const TimeIRParsingGroupName = "LLVM IR Parsing";
30 static const char *const TimeIRParsingName = "Parse IR";
31 
32 static std::unique_ptr<Module>
getLazyIRModule(std::unique_ptr<MemoryBuffer> Buffer,SMDiagnostic & Err,LLVMContext & Context,bool ShouldLazyLoadMetadata)33 getLazyIRModule(std::unique_ptr<MemoryBuffer> Buffer, SMDiagnostic &Err,
34                 LLVMContext &Context, bool ShouldLazyLoadMetadata) {
35   if (isBitcode((const unsigned char *)Buffer->getBufferStart(),
36                 (const unsigned char *)Buffer->getBufferEnd())) {
37     ErrorOr<std::unique_ptr<Module>> ModuleOrErr = getLazyBitcodeModule(
38         std::move(Buffer), Context, ShouldLazyLoadMetadata);
39     if (std::error_code EC = ModuleOrErr.getError()) {
40       Err = SMDiagnostic(Buffer->getBufferIdentifier(), SourceMgr::DK_Error,
41                          EC.message());
42       return nullptr;
43     }
44     return std::move(ModuleOrErr.get());
45   }
46 
47   return parseAssembly(Buffer->getMemBufferRef(), Err, Context);
48 }
49 
getLazyIRFileModule(StringRef Filename,SMDiagnostic & Err,LLVMContext & Context,bool ShouldLazyLoadMetadata)50 std::unique_ptr<Module> llvm::getLazyIRFileModule(StringRef Filename,
51                                                   SMDiagnostic &Err,
52                                                   LLVMContext &Context,
53                                                   bool ShouldLazyLoadMetadata) {
54   ErrorOr<std::unique_ptr<MemoryBuffer>> FileOrErr =
55       MemoryBuffer::getFileOrSTDIN(Filename);
56   if (std::error_code EC = FileOrErr.getError()) {
57     Err = SMDiagnostic(Filename, SourceMgr::DK_Error,
58                        "Could not open input file: " + EC.message());
59     return nullptr;
60   }
61 
62   return getLazyIRModule(std::move(FileOrErr.get()), Err, Context,
63                          ShouldLazyLoadMetadata);
64 }
65 
parseIR(MemoryBufferRef Buffer,SMDiagnostic & Err,LLVMContext & Context)66 std::unique_ptr<Module> llvm::parseIR(MemoryBufferRef 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<std::unique_ptr<Module>> ModuleOrErr =
73         parseBitcodeFile(Buffer, Context);
74     if (std::error_code EC = ModuleOrErr.getError()) {
75       Err = SMDiagnostic(Buffer.getBufferIdentifier(), SourceMgr::DK_Error,
76                          EC.message());
77       return nullptr;
78     }
79     return std::move(ModuleOrErr.get());
80   }
81 
82   return parseAssembly(Buffer, Err, Context);
83 }
84 
parseIRFile(StringRef Filename,SMDiagnostic & Err,LLVMContext & Context)85 std::unique_ptr<Module> llvm::parseIRFile(StringRef Filename, SMDiagnostic &Err,
86                                           LLVMContext &Context) {
87   ErrorOr<std::unique_ptr<MemoryBuffer>> FileOrErr =
88       MemoryBuffer::getFileOrSTDIN(Filename);
89   if (std::error_code EC = FileOrErr.getError()) {
90     Err = SMDiagnostic(Filename, SourceMgr::DK_Error,
91                        "Could not open input file: " + EC.message());
92     return nullptr;
93   }
94 
95   return parseIR(FileOrErr.get()->getMemBufferRef(), Err, Context);
96 }
97 
98 //===----------------------------------------------------------------------===//
99 // C API.
100 //===----------------------------------------------------------------------===//
101 
LLVMParseIRInContext(LLVMContextRef ContextRef,LLVMMemoryBufferRef MemBuf,LLVMModuleRef * OutM,char ** OutMessage)102 LLVMBool LLVMParseIRInContext(LLVMContextRef ContextRef,
103                               LLVMMemoryBufferRef MemBuf, LLVMModuleRef *OutM,
104                               char **OutMessage) {
105   SMDiagnostic Diag;
106 
107   std::unique_ptr<MemoryBuffer> MB(unwrap(MemBuf));
108   *OutM =
109       wrap(parseIR(MB->getMemBufferRef(), Diag, *unwrap(ContextRef)).release());
110 
111   if(!*OutM) {
112     if (OutMessage) {
113       std::string buf;
114       raw_string_ostream os(buf);
115 
116       Diag.print(nullptr, os, false);
117       os.flush();
118 
119       *OutMessage = strdup(buf.c_str());
120     }
121     return 1;
122   }
123 
124   return 0;
125 }
126