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[PR93306] Short-circuit has_include

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the preprocessor evaluator has a skip_eval counter, but we weren't
checking it after parsing has_include(foo), but before looking for
foo.  Resulting in unnecessary io for 'FALSE_COND && has_include <foo>'

	PR preprocessor/93306
	* expr.c (parse_has_include): Refactor.  Check skip_eval before
	looking.
This commit is contained in:
Nathan Sidwell 2020-01-17 05:39:47 -08:00
parent 5f0303833d
commit bf09d886a4
2 changed files with 18 additions and 22 deletions
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6
libcpp/ChangeLog
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@ -1,3 +1,9 @@
2020-01-17 Nathan Sidwell <nathan@acm.org>
PR preprocessor/93306
* expr.c (parse_has_include): Refactor. Check skip_eval before
looking.
2020-01-10 David Malcolm <dmalcolm@redhat.com>
* include/line-map.h (class diagnostic_path): New forward decl.

34
libcpp/expr.c
View File

@ -2195,11 +2195,6 @@ static cpp_num
parse_has_include (cpp_reader *pfile, enum include_type type)
{
cpp_num result;
bool paren = false;
cpp_hashnode *node = 0;
const cpp_token *token;
bool bracket = false;
char *fname = 0;
result.unsignedp = false;
result.high = 0;
@ -2208,39 +2203,34 @@ parse_has_include (cpp_reader *pfile, enum include_type type)
pfile->state.in__has_include__++;
token = cpp_get_token (pfile);
if (token->type == CPP_OPEN_PAREN)
{
paren = true;
token = cpp_get_token (pfile);
}
const cpp_token *token = cpp_get_token (pfile);
bool paren = token->type == CPP_OPEN_PAREN;
if (paren)
token = cpp_get_token (pfile);
bool bracket = token->type != CPP_STRING;
cpp_hashnode *node = NULL;
char *fname = NULL;
if (token->type == CPP_STRING || token->type == CPP_HEADER_NAME)
{
if (token->type == CPP_HEADER_NAME)
bracket = true;
fname = XNEWVEC (char, token->val.str.len - 1);
memcpy (fname, token->val.str.text + 1, token->val.str.len - 2);
fname[token->val.str.len - 2] = '\0';
node = token->val.node.node;
}
else if (token->type == CPP_LESS)
{
bracket = true;
fname = _cpp_bracket_include (pfile);
}
fname = _cpp_bracket_include (pfile);
else
cpp_error (pfile, CPP_DL_ERROR,
"operator \"__has_include__\" requires a header string");
if (fname)
{
int angle_brackets = (bracket ? 1 : 0);
if (_cpp_has_header (pfile, fname, angle_brackets, type))
/* Do not do the lookup if we're skipping, that's unnecessary
IO. */
if (!pfile->state.skip_eval
&& _cpp_has_header (pfile, fname, bracket, type))
result.low = 1;
else
result.low = 0;
XDELETEVEC (fname);
}