diff options
Diffstat (limited to 'contrib/gcclibs/libcpp/lex.c')
| -rw-r--r-- | contrib/gcclibs/libcpp/lex.c | 30 |
1 files changed, 21 insertions, 9 deletions
diff --git a/contrib/gcclibs/libcpp/lex.c b/contrib/gcclibs/libcpp/lex.c index df09bd6..5d1a688 100644 --- a/contrib/gcclibs/libcpp/lex.c +++ b/contrib/gcclibs/libcpp/lex.c @@ -111,31 +111,39 @@ _cpp_clean_line (cpp_reader *pfile) if (!buffer->from_stage3) { + const uchar *pbackslash = NULL; + /* Short circuit for the common case of an un-escaped line with no trigraphs. The primary win here is by not writing any data back to memory until we have to. */ for (;;) { c = *++s; - if (c == '\n' || c == '\r') + if (__builtin_expect (c == '\n', false) + || __builtin_expect (c == '\r', false)) { d = (uchar *) s; - if (s == buffer->rlimit) + if (__builtin_expect (s == buffer->rlimit, false)) goto done; /* DOS line ending? */ - if (c == '\r' && s[1] == '\n') - s++; + if (__builtin_expect (c == '\r', false) + && s[1] == '\n') + { + s++; + if (s == buffer->rlimit) + goto done; + } - if (s == buffer->rlimit) + if (__builtin_expect (pbackslash == NULL, true)) goto done; - /* check for escaped newline */ + /* Check for escaped newline. */ p = d; - while (p != buffer->next_line && is_nvspace (p[-1])) + while (is_nvspace (p[-1])) p--; - if (p == buffer->next_line || p[-1] != '\\') + if (p - 1 != pbackslash) goto done; /* Have an escaped newline; process it and proceed to @@ -145,7 +153,11 @@ _cpp_clean_line (cpp_reader *pfile) buffer->next_line = p - 1; break; } - if (c == '?' && s[1] == '?' && _cpp_trigraph_map[s[2]]) + if (__builtin_expect (c == '\\', false)) + pbackslash = s; + else if (__builtin_expect (c == '?', false) + && __builtin_expect (s[1] == '?', false) + && _cpp_trigraph_map[s[2]]) { /* Have a trigraph. We may or may not have to convert it. Add a line note regardless, for -Wtrigraphs. */ |
