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stub out parser for asm files. Change invariant on lexer to always

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print its error message when it returns an asmtok::Error token.
Compute a proper error code for llvm-mc in 'lex' mode.  Add new
-as-lex option to enable lexing mode (vs parsing mode).


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@73859 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Chris Lattner
2009-06-21 20:16:42 +00:00
parent 10a907d70f
commit 27aa7d259b
5 changed files with 102 additions and 14 deletions
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11
tools/llvm-mc/AsmLexer.cpp
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@ -84,7 +84,7 @@ asmtok::TokKind AsmLexer::LexIdentifier() {
/// LexPercent: Register: %[a-zA-Z0-9]+
asmtok::TokKind AsmLexer::LexPercent() {
if (!isalnum(*CurPtr))
return asmtok::Error; // Must have at least one character.
return ReturnError(TokStart, "invalid register name");
while (isalnum(*CurPtr))
++CurPtr;
CurStrVal.assign(TokStart, CurPtr); // Skip %
@ -103,8 +103,7 @@ asmtok::TokKind AsmLexer::LexSlash() {
int CurChar = getNextChar();
switch (CurChar) {
case EOF:
PrintError(TokStart, "Unterminated comment!");
return asmtok::Error;
return ReturnError(TokStart, "unterminated comment");
case '*':
// End of the comment?
if (CurPtr[0] != '/') break;
@ -137,9 +136,9 @@ asmtok::TokKind AsmLexer::LexHash() {
/// TODO: FP literal.
asmtok::TokKind AsmLexer::LexDigit() {
if (*CurPtr == ':')
return asmtok::Error; // FIXME LOCAL LABEL.
return ReturnError(TokStart, "FIXME: local label not implemented");
if (*CurPtr == 'f' || *CurPtr == 'b')
return asmtok::Error; // FIXME FORWARD/BACKWARD LABEL.
return ReturnError(TokStart, "FIXME: directional label not implemented");
// Decimal integer: [1-9][0-9]*
if (CurPtr[-1] != '0') {
@ -229,7 +228,7 @@ asmtok::TokKind AsmLexer::LexToken() {
return LexIdentifier();
// Unknown character, emit an error.
return asmtok::Error;
return ReturnError(TokStart, "invalid character in input");
case EOF: return asmtok::Eof;
case 0:
case ' ':