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First step in supporting #line directives in assembler. This step parses the

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#line directives with the needed support in the lexer.  Next will be to build
a simple file/line# table mapping source SMLoc's for later use by diagnostics.
And the last step will be to get the diagnostics to use the mapping for file
and line numbers.


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@139669 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Kevin Enderby
2011-09-13 23:45:18 +00:00
parent 4bffb62289
commit f1c21a8da6
3 changed files with 70 additions and 5 deletions
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23
lib/MC/MCParser/AsmLexer.cpp
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@@ -334,6 +334,17 @@ StringRef AsmLexer::LexUntilEndOfStatement() {
return StringRef(TokStart, CurPtr-TokStart);
}
StringRef AsmLexer::LexUntilEndOfLine() {
TokStart = CurPtr;
while (*CurPtr != '\n' &&
*CurPtr != '\r' &&
(*CurPtr != 0 || CurPtr != CurBuf->getBufferEnd())) {
++CurPtr;
}
return StringRef(TokStart, CurPtr-TokStart);
}
bool AsmLexer::isAtStartOfComment(char Char) {
// FIXME: This won't work for multi-character comment indicators like "//".
return Char == *MAI.getCommentString();
@@ -345,17 +356,26 @@ bool AsmLexer::isAtStatementSeparator(const char *Ptr) {
}
AsmToken AsmLexer::LexToken() {
static bool isAtStartOfLine = true;
TokStart = CurPtr;
// This always consumes at least one character.
int CurChar = getNextChar();
if (isAtStartOfComment(CurChar))
if (isAtStartOfComment(CurChar)) {
// If this comment starts with a '#', then return the Hash token and let
// the assembler parser see if it can be parsed as a cpp line filename
// comment. We do this only if we are at the start of a line.
if (CurChar == '#' && isAtStartOfLine)
return AsmToken(AsmToken::Hash, StringRef(TokStart, 1));
isAtStartOfLine = true;
return LexLineComment();
}
if (isAtStatementSeparator(TokStart)) {
CurPtr += strlen(MAI.getSeparatorString()) - 1;
return AsmToken(AsmToken::EndOfStatement,
StringRef(TokStart, strlen(MAI.getSeparatorString())));
}
isAtStartOfLine = false;
switch (CurChar) {
default:
@@ -373,6 +393,7 @@ AsmToken AsmLexer::LexToken() {
return LexToken();
case '\n': // FALL THROUGH.
case '\r':
isAtStartOfLine = true;
return AsmToken(AsmToken::EndOfStatement, StringRef(TokStart, 1));
case ':': return AsmToken(AsmToken::Colon, StringRef(TokStart, 1));
case '+': return AsmToken(AsmToken::Plus, StringRef(TokStart, 1));