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
23using namespace llvm;
24
25namespace llvm {
26  extern bool TimePassesIsEnabled;
27}
28
29static const char *const TimeIRParsingGroupName = "LLVM IR Parsing";
30static const char *const TimeIRParsingName = "Parse IR";
31
32static Module *getLazyIRModule(MemoryBuffer *Buffer, SMDiagnostic &Err,
33                               LLVMContext &Context) {
34  if (isBitcode((const unsigned char *)Buffer->getBufferStart(),
35                (const unsigned char *)Buffer->getBufferEnd())) {
36    std::string ErrMsg;
37    ErrorOr<Module *> ModuleOrErr = getLazyBitcodeModule(Buffer, Context);
38    if (std::error_code EC = ModuleOrErr.getError()) {
39      Err = SMDiagnostic(Buffer->getBufferIdentifier(), SourceMgr::DK_Error,
40                         EC.message());
41      // getLazyBitcodeModule does not take ownership of the Buffer in the
42      // case of an error.
43      delete Buffer;
44      return nullptr;
45    }
46    return ModuleOrErr.get();
47  }
48
49  return ParseAssembly(Buffer, nullptr, Err, Context);
50}
51
52Module *llvm::getLazyIRFileModule(const std::string &Filename, SMDiagnostic &Err,
53                                  LLVMContext &Context) {
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(FileOrErr.get().release(), 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    ErrorOr<Module *> ModuleOrErr = parseBitcodeFile(Buffer, Context);
72    Module *M = nullptr;
73    if (std::error_code EC = ModuleOrErr.getError())
74      Err = SMDiagnostic(Buffer->getBufferIdentifier(), SourceMgr::DK_Error,
75                         EC.message());
76    else
77      M = ModuleOrErr.get();
78    // parseBitcodeFile does not take ownership of the Buffer.
79    return M;
80  }
81
82  return ParseAssembly(MemoryBuffer::getMemBuffer(
83                           Buffer->getBuffer(), Buffer->getBufferIdentifier()),
84                       nullptr, Err, Context);
85}
86
87Module *llvm::ParseIRFile(const std::string &Filename, SMDiagnostic &Err,
88                          LLVMContext &Context) {
89  ErrorOr<std::unique_ptr<MemoryBuffer>> FileOrErr =
90      MemoryBuffer::getFileOrSTDIN(Filename);
91  if (std::error_code EC = FileOrErr.getError()) {
92    Err = SMDiagnostic(Filename, SourceMgr::DK_Error,
93                       "Could not open input file: " + EC.message());
94    return nullptr;
95  }
96
97  return ParseIR(FileOrErr.get().get(), Err, Context);
98}
99
100//===----------------------------------------------------------------------===//
101// C API.
102//===----------------------------------------------------------------------===//
103
104LLVMBool LLVMParseIRInContext(LLVMContextRef ContextRef,
105                              LLVMMemoryBufferRef MemBuf, LLVMModuleRef *OutM,
106                              char **OutMessage) {
107  SMDiagnostic Diag;
108
109  std::unique_ptr<MemoryBuffer> MB(unwrap(MemBuf));
110  *OutM = wrap(ParseIR(MB.get(), Diag, *unwrap(ContextRef)));
111
112  if(!*OutM) {
113    if (OutMessage) {
114      std::string buf;
115      raw_string_ostream os(buf);
116
117      Diag.print(nullptr, os, false);
118      os.flush();
119
120      *OutMessage = strdup(buf.c_str());
121    }
122    return 1;
123  }
124
125  return 0;
126}
127