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[AsmParser] Avoid recursing when lexing ';'. NFC.

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This should prevent stack overflows in non-optimized builds on
.ll files with lots of consecutive commented-out lines.

Instead of recursing into LexToken(), continue into a 'while (true)'.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@287170 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Ahmed Bougacha 2016-11-16 22:25:05 +00:00
parent 03cebfbba9
commit 10adab0d54
1 changed files with 54 additions and 52 deletions
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6
lib/AsmParser/LLLexer.cpp
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@ -180,6 +180,7 @@ int LLLexer::getNextChar() {
}
lltok::Kind LLLexer::LexToken() {
while (true) {
TokStart = CurPtr;
int CurChar = getNextChar();
@ -197,7 +198,7 @@ lltok::Kind LLLexer::LexToken() {
case '\n':
case '\r':
// Ignore whitespace.
return LexToken();
continue;
case '+': return LexPositive();
case '@': return LexAt();
case '$': return LexDollar();
@ -216,7 +217,7 @@ lltok::Kind LLLexer::LexToken() {
return lltok::Error;
case ';':
SkipLineComment();
return LexToken();
continue;
case '!': return LexExclaim();
case '#': return LexHash();
case '0': case '1': case '2': case '3': case '4':
@ -237,6 +238,7 @@ lltok::Kind LLLexer::LexToken() {
case '|': return lltok::bar;
}
}
}
void LLLexer::SkipLineComment() {
while (true) {