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