xref: /freebsd/contrib/llvm-project/llvm/lib/TableGen/Parser.cpp (revision e6bfd18d21b225af6a0ed67ceeaf1293b7b9eba5)
1 //===- Parser.cpp - Top-Level TableGen Parser implementation --------------===//
2 //
3 // Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
4 // See https://llvm.org/LICENSE.txt for license information.
5 // SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
6 //
7 //===----------------------------------------------------------------------===//
8 
9 #include "llvm/TableGen/Parser.h"
10 #include "TGParser.h"
11 #include "llvm/Support/MemoryBuffer.h"
12 #include "llvm/TableGen/Record.h"
13 
14 using namespace llvm;
15 
16 bool llvm::TableGenParseFile(SourceMgr &InputSrcMgr, RecordKeeper &Records) {
17   // Initialize the global TableGen source manager by temporarily taking control
18   // of the input buffer in `SrcMgr`. This is kind of a hack, but allows for
19   // preserving TableGen's current awkward diagnostic behavior. If we can remove
20   // this reliance, we could drop all of this.
21   SrcMgr = SourceMgr();
22   SrcMgr.takeSourceBuffersFrom(InputSrcMgr);
23   SrcMgr.setIncludeDirs(InputSrcMgr.getIncludeDirs());
24   SrcMgr.setDiagHandler(InputSrcMgr.getDiagHandler(),
25                         InputSrcMgr.getDiagContext());
26 
27   // Setup the record keeper and try to parse the file.
28   auto *MainFileBuffer = SrcMgr.getMemoryBuffer(SrcMgr.getMainFileID());
29   Records.saveInputFilename(MainFileBuffer->getBufferIdentifier().str());
30 
31   TGParser Parser(SrcMgr, /*Macros=*/None, Records);
32   bool ParseResult = Parser.ParseFile();
33 
34   // After parsing, reclaim the source manager buffers from TableGen's global
35   // manager.
36   InputSrcMgr.takeSourceBuffersFrom(SrcMgr);
37   SrcMgr = SourceMgr();
38   return ParseResult;
39 }
40