llvm/lib/TableGen/Parser.cpp

   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=*/std::nullopt, Records,
  32                   /*NoWarnOnUnusedTemplateArgs=*/false,
  33                   /*TrackReferenceLocs=*/true);
  34   bool ParseResult = Parser.ParseFile();
  35
  36   // After parsing, reclaim the source manager buffers from TableGen's global
  37   // manager.
  38   InputSrcMgr.takeSourceBuffersFrom(SrcMgr);
  39   SrcMgr = SourceMgr();
  40   return ParseResult;
  41 }