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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/ADT/STLExtras.h"
17 #include "llvm/IR/Module.h"
18 #include "llvm/Support/MemoryBuffer.h"
19 #include "llvm/Support/SourceMgr.h"
20 #include "llvm/Support/raw_ostream.h"
21 #include <cstring>
22 #include <system_error>
23 using namespace llvm;
24 
parseAssemblyInto(MemoryBufferRef F,Module & M,SMDiagnostic & Err,SlotMapping * Slots)25 bool llvm::parseAssemblyInto(MemoryBufferRef F, Module &M, SMDiagnostic &Err,
26                              SlotMapping *Slots) {
27   SourceMgr SM;
28   std::unique_ptr<MemoryBuffer> Buf = MemoryBuffer::getMemBuffer(F);
29   SM.AddNewSourceBuffer(std::move(Buf), SMLoc());
30 
31   return LLParser(F.getBuffer(), SM, Err, &M, Slots).Run();
32 }
33 
parseAssembly(MemoryBufferRef F,SMDiagnostic & Err,LLVMContext & Context,SlotMapping * Slots)34 std::unique_ptr<Module> llvm::parseAssembly(MemoryBufferRef F,
35                                             SMDiagnostic &Err,
36                                             LLVMContext &Context,
37                                             SlotMapping *Slots) {
38   std::unique_ptr<Module> M =
39       make_unique<Module>(F.getBufferIdentifier(), Context);
40 
41   if (parseAssemblyInto(F, *M, Err, Slots))
42     return nullptr;
43 
44   return M;
45 }
46 
parseAssemblyFile(StringRef Filename,SMDiagnostic & Err,LLVMContext & Context,SlotMapping * Slots)47 std::unique_ptr<Module> llvm::parseAssemblyFile(StringRef Filename,
48                                                 SMDiagnostic &Err,
49                                                 LLVMContext &Context,
50                                                 SlotMapping *Slots) {
51   ErrorOr<std::unique_ptr<MemoryBuffer>> FileOrErr =
52       MemoryBuffer::getFileOrSTDIN(Filename);
53   if (std::error_code EC = FileOrErr.getError()) {
54     Err = SMDiagnostic(Filename, SourceMgr::DK_Error,
55                        "Could not open input file: " + EC.message());
56     return nullptr;
57   }
58 
59   return parseAssembly(FileOrErr.get()->getMemBufferRef(), Err, Context, Slots);
60 }
61 
parseAssemblyString(StringRef AsmString,SMDiagnostic & Err,LLVMContext & Context,SlotMapping * Slots)62 std::unique_ptr<Module> llvm::parseAssemblyString(StringRef AsmString,
63                                                   SMDiagnostic &Err,
64                                                   LLVMContext &Context,
65                                                   SlotMapping *Slots) {
66   MemoryBufferRef F(AsmString, "<string>");
67   return parseAssembly(F, Err, Context, Slots);
68 }
69 
parseConstantValue(StringRef Asm,SMDiagnostic & Err,const Module & M,const SlotMapping * Slots)70 Constant *llvm::parseConstantValue(StringRef Asm, SMDiagnostic &Err,
71                                    const Module &M, const SlotMapping *Slots) {
72   SourceMgr SM;
73   std::unique_ptr<MemoryBuffer> Buf = MemoryBuffer::getMemBuffer(Asm);
74   SM.AddNewSourceBuffer(std::move(Buf), SMLoc());
75   Constant *C;
76   if (LLParser(Asm, SM, Err, const_cast<Module *>(&M))
77           .parseStandaloneConstantValue(C, Slots))
78     return nullptr;
79   return C;
80 }
81 
parseType(StringRef Asm,SMDiagnostic & Err,const Module & M,const SlotMapping * Slots)82 Type *llvm::parseType(StringRef Asm, SMDiagnostic &Err, const Module &M,
83                       const SlotMapping *Slots) {
84   unsigned Read;
85   Type *Ty = parseTypeAtBeginning(Asm, Read, Err, M, Slots);
86   if (!Ty)
87     return nullptr;
88   if (Read != Asm.size()) {
89     SourceMgr SM;
90     std::unique_ptr<MemoryBuffer> Buf = MemoryBuffer::getMemBuffer(Asm);
91     SM.AddNewSourceBuffer(std::move(Buf), SMLoc());
92     Err = SM.GetMessage(SMLoc::getFromPointer(Asm.begin() + Read),
93                         SourceMgr::DK_Error, "expected end of string");
94     return nullptr;
95   }
96   return Ty;
97 }
parseTypeAtBeginning(StringRef Asm,unsigned & Read,SMDiagnostic & Err,const Module & M,const SlotMapping * Slots)98 Type *llvm::parseTypeAtBeginning(StringRef Asm, unsigned &Read,
99                                  SMDiagnostic &Err, const Module &M,
100                                  const SlotMapping *Slots) {
101   SourceMgr SM;
102   std::unique_ptr<MemoryBuffer> Buf = MemoryBuffer::getMemBuffer(Asm);
103   SM.AddNewSourceBuffer(std::move(Buf), SMLoc());
104   Type *Ty;
105   if (LLParser(Asm, SM, Err, const_cast<Module *>(&M))
106           .parseTypeAtBeginning(Ty, Read, Slots))
107     return nullptr;
108   return Ty;
109 }
110