1 //===- Parser.cpp - Main dispatch module for the Parser library -----------===//
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 // This library implements the functionality defined in llvm/AsmParser/Parser.h
11 //
12 //===----------------------------------------------------------------------===//
13 
14 #include "llvm/AsmParser/Parser.h"
15 #include "LLParser.h"
16 #include "llvm/IR/Module.h"
17 #include "llvm/Support/MemoryBuffer.h"
18 #include "llvm/Support/SourceMgr.h"
19 #include "llvm/Support/raw_ostream.h"
20 #include <cstring>
21 #include <system_error>
22 using namespace llvm;
23 
24 Module *llvm::ParseAssembly(std::unique_ptr<MemoryBuffer> F, Module *M,
25                             SMDiagnostic &Err, LLVMContext &Context) {
26   SourceMgr SM;
27   MemoryBuffer *Buf = F.get();
28   SM.AddNewSourceBuffer(F.release(), SMLoc());
29 
30   // If we are parsing into an existing module, do it.
31   if (M)
32     return LLParser(Buf, SM, Err, M).Run() ? nullptr : M;
33 
34   // Otherwise create a new module.
35   std::unique_ptr<Module> M2(new Module(Buf->getBufferIdentifier(), Context));
36   if (LLParser(Buf, SM, Err, M2.get()).Run())
37     return nullptr;
38   return M2.release();
39 }
40 
41 Module *llvm::ParseAssemblyFile(const std::string &Filename, SMDiagnostic &Err,
42                                 LLVMContext &Context) {
43   ErrorOr<std::unique_ptr<MemoryBuffer>> FileOrErr =
44       MemoryBuffer::getFileOrSTDIN(Filename);
45   if (std::error_code EC = FileOrErr.getError()) {
46     Err = SMDiagnostic(Filename, SourceMgr::DK_Error,
47                        "Could not open input file: " + EC.message());
48     return nullptr;
49   }
50 
51   return ParseAssembly(std::move(FileOrErr.get()), nullptr, Err, Context);
52 }
53 
54 Module *llvm::ParseAssemblyString(const char *AsmString, Module *M,
55                                   SMDiagnostic &Err, LLVMContext &Context) {
56   MemoryBuffer *F =
57       MemoryBuffer::getMemBuffer(StringRef(AsmString), "<string>");
58 
59   return ParseAssembly(std::unique_ptr<MemoryBuffer>(F), M, Err, Context);
60 }
61