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Bug 819509 - Reduce possible tokenizer lookahead. r=njn

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--HG--
extra : rebase_source : 85362ff2f4703c23cb5a46cef5fa837a4d8f8240
This commit is contained in:
Benjamin Peterson 2012-12-12 01:35:26 -05:00
parent 1b37e03c8c
commit 7044ad9b09
1 changed files with 4 additions and 3 deletions
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7
js/src/frontend/TokenStream.h
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@ -460,8 +460,9 @@ class TokenStream
PARA_SEPARATOR = 0x2029
};
static const size_t ntokens = 4; /* 1 current + 3 lookahead, rounded
static const size_t ntokens = 4; /* 1 current + 2 lookahead, rounded
to power of 2 to avoid divmod by 3 */
static const unsigned maxLookahead = 2;
static const unsigned ntokensMask = ntokens - 1;
public:
@ -604,7 +605,7 @@ class TokenStream
TokenKind peekToken() {
if (lookahead != 0) {
JS_ASSERT(lookahead <= 2);
JS_ASSERT(lookahead < maxLookahead);
return tokens[(cursor + lookahead) & ntokensMask].type;
}
TokenKind tt = getTokenInternal();
@ -622,7 +623,7 @@ class TokenStream
return TOK_EOL;
if (lookahead != 0) {
JS_ASSERT(lookahead <= 2);
JS_ASSERT(lookahead < maxLookahead);
return tokens[(cursor + lookahead) & ntokensMask].type;
}