From 84c287e33cc3f46e7d6868de14809bd5ae4a84b1 Mon Sep 17 00:00:00 2001
From: Peter Collingbourne <peter@pcc.me.uk>
Date: Sat, 1 Oct 2011 16:41:13 +0000
Subject: Move TableGen's parser and entry point into a library

This is the first step towards splitting LLVM and Clang's tblgen executables.

llvm-svn: 140951
---
 llvm/lib/TableGen/TGParser.h | 122 +++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 122 insertions(+)
 create mode 100644 llvm/lib/TableGen/TGParser.h

(limited to 'llvm/lib/TableGen/TGParser.h')

diff --git a/llvm/lib/TableGen/TGParser.h b/llvm/lib/TableGen/TGParser.h
new file mode 100644
index 00000000000..b408c80b7a1
--- /dev/null
+++ b/llvm/lib/TableGen/TGParser.h
@@ -0,0 +1,122 @@
+//===- TGParser.h - Parser for TableGen Files -------------------*- C++ -*-===//
+//
+//                     The LLVM Compiler Infrastructure
+//
+// This file is distributed under the University of Illinois Open Source
+// License. See LICENSE.TXT for details.
+//
+//===----------------------------------------------------------------------===//
+//
+// This class represents the Parser for tablegen files.
+//
+//===----------------------------------------------------------------------===//
+
+#ifndef TGPARSER_H
+#define TGPARSER_H
+
+#include "TGLexer.h"
+#include "llvm/TableGen/Error.h"
+#include "llvm/ADT/Twine.h"
+#include "llvm/Support/SourceMgr.h"
+#include <map>
+
+namespace llvm {
+  class Record;
+  class RecordVal;
+  class RecordKeeper;
+  class RecTy;
+  class Init;
+  struct MultiClass;
+  struct SubClassReference;
+  struct SubMultiClassReference;
+  
+  struct LetRecord {
+    std::string Name;
+    std::vector<unsigned> Bits;
+    Init *Value;
+    SMLoc Loc;
+    LetRecord(const std::string &N, const std::vector<unsigned> &B, Init *V,
+              SMLoc L)
+      : Name(N), Bits(B), Value(V), Loc(L) {
+    }
+  };
+  
+class TGParser {
+  TGLexer Lex;
+  std::vector<std::vector<LetRecord> > LetStack;
+  std::map<std::string, MultiClass*> MultiClasses;
+  
+  /// CurMultiClass - If we are parsing a 'multiclass' definition, this is the 
+  /// current value.
+  MultiClass *CurMultiClass;
+
+  // Record tracker
+  RecordKeeper &Records;
+public:
+  TGParser(SourceMgr &SrcMgr, RecordKeeper &records) : 
+    Lex(SrcMgr), CurMultiClass(0), Records(records) {}
+  
+  /// ParseFile - Main entrypoint for parsing a tblgen file.  These parser
+  /// routines return true on error, or false on success.
+  bool ParseFile();
+  
+  bool Error(SMLoc L, const Twine &Msg) const {
+    PrintError(L, Msg);
+    return true;
+  }
+  bool TokError(const Twine &Msg) const {
+    return Error(Lex.getLoc(), Msg);
+  }
+  const std::vector<std::string> &getDependencies() const {
+    return Lex.getDependencies();
+  }
+private:  // Semantic analysis methods.
+  bool AddValue(Record *TheRec, SMLoc Loc, const RecordVal &RV);
+  bool SetValue(Record *TheRec, SMLoc Loc, const std::string &ValName, 
+                const std::vector<unsigned> &BitList, Init *V);
+  bool AddSubClass(Record *Rec, SubClassReference &SubClass);
+  bool AddSubMultiClass(MultiClass *CurMC,
+                        SubMultiClassReference &SubMultiClass);
+
+private:  // Parser methods.
+  bool ParseObjectList(MultiClass *MC = 0);
+  bool ParseObject(MultiClass *MC);
+  bool ParseClass();
+  bool ParseMultiClass();
+  bool ParseDefm(MultiClass *CurMultiClass);
+  bool ParseDef(MultiClass *CurMultiClass);
+  bool ParseTopLevelLet(MultiClass *CurMultiClass);
+  std::vector<LetRecord> ParseLetList();
+
+  bool ParseObjectBody(Record *CurRec);
+  bool ParseBody(Record *CurRec);
+  bool ParseBodyItem(Record *CurRec);
+
+  bool ParseTemplateArgList(Record *CurRec);
+  std::string ParseDeclaration(Record *CurRec, bool ParsingTemplateArgs);
+
+  SubClassReference ParseSubClassReference(Record *CurRec, bool isDefm);
+  SubMultiClassReference ParseSubMultiClassReference(MultiClass *CurMC);
+
+  Init *ParseIDValue(Record *CurRec);
+  Init *ParseIDValue(Record *CurRec, const std::string &Name, SMLoc NameLoc);
+  Init *ParseSimpleValue(Record *CurRec, RecTy *ItemType = 0);
+  Init *ParseValue(Record *CurRec, RecTy *ItemType = 0);
+  std::vector<Init*> ParseValueList(Record *CurRec, Record *ArgsRec = 0, RecTy *EltTy = 0);
+  std::vector<std::pair<llvm::Init*, std::string> > ParseDagArgList(Record *);
+  bool ParseOptionalRangeList(std::vector<unsigned> &Ranges);
+  bool ParseOptionalBitList(std::vector<unsigned> &Ranges);
+  std::vector<unsigned> ParseRangeList();
+  bool ParseRangePiece(std::vector<unsigned> &Ranges);
+  RecTy *ParseType();
+  Init *ParseOperation(Record *CurRec);
+  RecTy *ParseOperatorType();
+  std::string ParseObjectName();
+  Record *ParseClassID();
+  MultiClass *ParseMultiClassID();
+  Record *ParseDefmID();
+};
+  
+} // end namespace llvm
+
+#endif
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