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[AsmParser] Provide target direct access to mnemonic token. Allow assignment parsing to be hooked by target. Allow target to specify if identifier is a label.

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Differential Revision:  http://reviews.llvm.org/D14255

llvm-svn: 252435
This commit is contained in:
Colin LeMahieu 2015-11-09 00:15:45 +00:00
parent 705d5922fa
commit 0bbf32d6ae
2 changed files with 14 additions and 1 deletions
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9
include/llvm/MC/MCTargetAsmParser.h
View File

@ -143,6 +143,10 @@ public:
/// \return True on failure.
virtual bool ParseInstruction(ParseInstructionInfo &Info, StringRef Name,
SMLoc NameLoc, OperandVector &Operands) = 0;
virtual bool ParseInstruction(ParseInstructionInfo &Info, StringRef Name,
AsmToken Token, OperandVector &Operands) {
return ParseInstruction(Info, Name, Token.getLoc(), Operands);
}
/// ParseDirective - Parse a target specific assembler directive
///
@ -192,6 +196,11 @@ public:
virtual void convertToMapAndConstraints(unsigned Kind,
const OperandVector &Operands) = 0;
// Return whether this parser uses assignment statements with equals tokens
virtual bool equalIsAsmAssignment() { return true; };
// Return whether this start of statement identifier is a label
virtual bool isLabel(AsmToken &Token) { return true; };
virtual const MCExpr *applyModifierToExpr(const MCExpr *E,
MCSymbolRefExpr::VariantKind,
MCContext &Ctx) {

6
lib/MC/MCParser/AsmParser.cpp
View File

@ -1396,6 +1396,8 @@ bool AsmParser::parseStatement(ParseStatementInfo &Info,
// See what kind of statement we have.
switch (Lexer.getKind()) {
case AsmToken::Colon: {
if (!getTargetParser().isLabel(ID))
break;
checkForValidSection();
// identifier ':' -> Label.
@ -1454,6 +1456,8 @@ bool AsmParser::parseStatement(ParseStatementInfo &Info,
}
case AsmToken::Equal:
if (!getTargetParser().equalIsAsmAssignment())
break;
// identifier '=' ... -> assignment statement
Lex();
@ -1701,7 +1705,7 @@ bool AsmParser::parseStatement(ParseStatementInfo &Info,
// Canonicalize the opcode to lower case.
std::string OpcodeStr = IDVal.lower();
ParseInstructionInfo IInfo(Info.AsmRewrites);
bool HadError = getTargetParser().ParseInstruction(IInfo, OpcodeStr, IDLoc,
bool HadError = getTargetParser().ParseInstruction(IInfo, OpcodeStr, ID,
Info.ParsedOperands);
Info.ParseError = HadError;