llvm/lib/MC/MCParser/MCAsmParser.cpp

   1 //===-- MCAsmParser.cpp - Abstract Asm Parser Interface -------------------===//
   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/MC/MCParser/MCAsmParser.h"
  10 #include "llvm/ADT/StringRef.h"
  11 #include "llvm/ADT/Twine.h"
  12 #include "llvm/Config/llvm-config.h"
  13 #include "llvm/MC/MCParser/MCAsmLexer.h"
  14 #include "llvm/MC/MCParser/MCParsedAsmOperand.h"
  15 #include "llvm/MC/MCParser/MCTargetAsmParser.h"
  16 #include "llvm/Support/CommandLine.h"
  17 #include "llvm/Support/Debug.h"
  18 #include "llvm/Support/SMLoc.h"
  19 #include "llvm/Support/raw_ostream.h"
  20 #include <cassert>
  21
  22 using namespace llvm;
  23
  24 namespace llvm {
  25 cl::opt<unsigned> AsmMacroMaxNestingDepth(
  26     "asm-macro-max-nesting-depth", cl::init(20), cl::Hidden,
  27     cl::desc("The maximum nesting depth allowed for assembly macros."));
  28 }
  29
  30 MCAsmParser::MCAsmParser() = default;
  31
  32 MCAsmParser::~MCAsmParser() = default;
  33
  34 void MCAsmParser::setTargetParser(MCTargetAsmParser &P) {
  35   assert(!TargetParser && "Target parser is already initialized!");
  36   TargetParser = &P;
  37   TargetParser->Initialize(*this);
  38 }
  39
  40 const AsmToken &MCAsmParser::getTok() const {
  41   return getLexer().getTok();
  42 }
  43
  44 bool MCAsmParser::parseTokenLoc(SMLoc &Loc) {
  45   Loc = getTok().getLoc();
  46   return false;
  47 }
  48
  49 bool MCAsmParser::parseEOL() {
  50   if (getTok().getKind() != AsmToken::EndOfStatement)
  51     return Error(getTok().getLoc(), "expected newline");
  52   Lex();
  53   return false;
  54 }
  55
  56 bool MCAsmParser::parseEOL(const Twine &Msg) {
  57   if (getTok().getKind() != AsmToken::EndOfStatement)
  58     return Error(getTok().getLoc(), Msg);
  59   Lex();
  60   return false;
  61 }
  62
  63 bool MCAsmParser::parseToken(AsmToken::TokenKind T, const Twine &Msg) {
  64   if (T == AsmToken::EndOfStatement)
  65     return parseEOL(Msg);
  66   if (getTok().getKind() != T)
  67     return Error(getTok().getLoc(), Msg);
  68   Lex();
  69   return false;
  70 }
  71
  72 bool MCAsmParser::parseIntToken(int64_t &V, const Twine &Msg) {
  73   if (getTok().getKind() != AsmToken::Integer)
  74     return TokError(Msg);
  75   V = getTok().getIntVal();
  76   Lex();
  77   return false;
  78 }
  79
  80 bool MCAsmParser::parseOptionalToken(AsmToken::TokenKind T) {
  81   bool Present = (getTok().getKind() == T);
  82   if (Present)
  83     parseToken(T);
  84   return Present;
  85 }
  86
  87 bool MCAsmParser::check(bool P, const Twine &Msg) {
  88   return check(P, getTok().getLoc(), Msg);
  89 }
  90
  91 bool MCAsmParser::check(bool P, SMLoc Loc, const Twine &Msg) {
  92   if (P)
  93     return Error(Loc, Msg);
  94   return false;
  95 }
  96
  97 bool MCAsmParser::TokError(const Twine &Msg, SMRange Range) {
  98   return Error(getLexer().getLoc(), Msg, Range);
  99 }
 100
 101 bool MCAsmParser::Error(SMLoc L, const Twine &Msg, SMRange Range) {
 102   MCPendingError PErr;
 103   PErr.Loc = L;
 104   Msg.toVector(PErr.Msg);
 105   PErr.Range = Range;
 106   PendingErrors.push_back(PErr);
 107
 108   // If we threw this parsing error after a lexing error, this should
 109   // supercede the lexing error and so we remove it from the Lexer
 110   // before it can propagate
 111   if (getTok().is(AsmToken::Error))
 112     getLexer().Lex();
 113   return true;
 114 }
 115
 116 bool MCAsmParser::addErrorSuffix(const Twine &Suffix) {
 117   // Make sure lexing errors have propagated to the parser.
 118   if (getTok().is(AsmToken::Error))
 119     Lex();
 120   for (auto &PErr : PendingErrors)
 121     Suffix.toVector(PErr.Msg);
 122   return true;
 123 }
 124
 125 bool MCAsmParser::parseMany(function_ref<bool()> parseOne, bool hasComma) {
 126   if (parseOptionalToken(AsmToken::EndOfStatement))
 127     return false;
 128   while (true) {
 129     if (parseOne())
 130       return true;
 131     if (parseOptionalToken(AsmToken::EndOfStatement))
 132       return false;
 133     if (hasComma && parseToken(AsmToken::Comma))
 134       return true;
 135   }
 136   return false;
 137 }
 138
 139 bool MCAsmParser::parseExpression(const MCExpr *&Res) {
 140   SMLoc L;
 141   return parseExpression(Res, L);
 142 }
 143
 144 bool MCAsmParser::parseGNUAttribute(SMLoc L, int64_t &Tag,
 145                                     int64_t &IntegerValue) {
 146   // Parse a .gnu_attribute with numerical tag and value.
 147   StringRef S(L.getPointer());
 148   SMLoc TagLoc;
 149   TagLoc = getTok().getLoc();
 150   const AsmToken &Tok = getTok();
 151   if (Tok.isNot(AsmToken::Integer))
 152     return false;
 153   Tag = Tok.getIntVal();
 154   Lex(); // Eat the Tag
 155   Lex(); // Eat the comma
 156   if (Tok.isNot(AsmToken::Integer))
 157     return false;
 158   IntegerValue = Tok.getIntVal();
 159   Lex(); // Eat the IntegerValue
 160   return true;
 161 }
 162
 163 void MCParsedAsmOperand::dump() const {
 164   // Cannot completely remove virtual function even in release mode.
 165 #if !defined(NDEBUG) || defined(LLVM_ENABLE_DUMP)
 166   dbgs() << "  " << *this;
 167 #endif
 168 }