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re PR preprocessor/36320 (Required diagnosis of syntax error missed)

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gcc/testsuite
	PR preprocessor/36320:
	* gcc.dg/cpp/pr36320.c: New file.
libcpp
	PR preprocessor/36320:
	* internal.h (_cpp_parse_expr): Update.
	* expr.c (_cpp_parse_expr): Add 'is_if' argument.  Update error
	messages.
	* directives.c (do_if): Update.
	(do_elif): Require expression if processing group.

From-SVN: r136209
This commit is contained in:
Tom Tromey 2008-05-30 14:25:09 +00:00 committed by Tom Tromey
parent bfab40f8e5
commit d750887f5f
6 changed files with 43 additions and 12 deletions
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5
gcc/testsuite/ChangeLog
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@ -1,3 +1,8 @@
2008-05-30 Tom Tromey <tromey@redhat.com>
PR preprocessor/36320:
* gcc.dg/cpp/pr36320.c: New file.
2008-05-29 Paolo Carlini <paolo.carlini@oracle.com>
PR c++/35243

8
gcc/testsuite/gcc.dg/cpp/pr36320.c Normal file
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@ -0,0 +1,8 @@
/* PR 36320 - #elif still requires valid expression. */
/* { dg-do preprocess } */
int z;
#if 1
#elif /* { dg-error "with no expression" } */
#endif

9
libcpp/ChangeLog
View File

@ -1,3 +1,12 @@
2008-05-30 Tom Tromey <tromey@redhat.com>
PR preprocessor/36320:
* internal.h (_cpp_parse_expr): Update.
* expr.c (_cpp_parse_expr): Add 'is_if' argument. Update error
messages.
* directives.c (do_if): Update.
(do_elif): Require expression if processing group.
2008-05-30 Danny Smith <dannysmith@users.sourceforge.net>
* include/cpplib.h (struct cpp_dir): Add new field, canonical_name.

24
libcpp/directives.c
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@ -1737,7 +1737,7 @@ do_if (cpp_reader *pfile)
int skip = 1;
if (! pfile->state.skipping)
skip = _cpp_parse_expr (pfile) == false;
skip = _cpp_parse_expr (pfile, true) == false;
push_conditional (pfile, skip, T_IF, pfile->mi_ind_cmacro);
}
@ -1796,15 +1796,23 @@ do_elif (cpp_reader *pfile)
}
ifs->type = T_ELIF;
/* Only evaluate this if we aren't skipping elses. During
evaluation, set skipping to false to get lexer warnings. */
if (ifs->skip_elses)
pfile->state.skipping = 1;
else
if (! ifs->was_skipping)
{
bool value;
/* The standard mandates that the expression be parsed even
if we are skipping elses at this point -- the lexical
restrictions on #elif only apply to skipped groups, but
this group is not being skipped. Temporarily set
skipping to false to get lexer warnings. */
pfile->state.skipping = 0;
pfile->state.skipping = ! _cpp_parse_expr (pfile);
ifs->skip_elses = ! pfile->state.skipping;
value = _cpp_parse_expr (pfile, false);
if (ifs->skip_elses)
pfile->state.skipping = 1;
else
{
pfile->state.skipping = ! value;
ifs->skip_elses = value;
}
}
/* Invalidate any controlling macro. */

7
libcpp/expr.c
View File

@ -852,7 +852,7 @@ static const struct cpp_operator
stored in the 'value' field of the stack element of the operator
that precedes it. */
bool
_cpp_parse_expr (cpp_reader *pfile)
_cpp_parse_expr (cpp_reader *pfile, bool is_if)
{
struct op *top = pfile->op_stack;
unsigned int lex_count;
@ -927,7 +927,7 @@ _cpp_parse_expr (cpp_reader *pfile)
SYNTAX_ERROR ("missing expression between '(' and ')'");
if (op.op == CPP_EOF && top->op == CPP_EOF)
SYNTAX_ERROR ("#if with no expression");
SYNTAX_ERROR2 ("%s with no expression", is_if ? "#if" : "#elif");
if (top->op != CPP_EOF && top->op != CPP_OPEN_PAREN)
SYNTAX_ERROR2 ("operator '%s' has no right operand",
@ -988,7 +988,8 @@ _cpp_parse_expr (cpp_reader *pfile)
if (top != pfile->op_stack)
{
cpp_error (pfile, CPP_DL_ICE, "unbalanced stack in #if");
cpp_error (pfile, CPP_DL_ICE, "unbalanced stack in %s",
is_if ? "#if" : "#elif");
syntax_error:
return false; /* Return false on syntax error. */
}

2
libcpp/internal.h
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@ -557,7 +557,7 @@ extern bool _cpp_read_file_entries (cpp_reader *, FILE *);
extern struct stat *_cpp_get_file_stat (_cpp_file *);
/* In expr.c */
extern bool _cpp_parse_expr (cpp_reader *);
extern bool _cpp_parse_expr (cpp_reader *, bool);
extern struct op *_cpp_expand_op_stack (cpp_reader *);
/* In lex.c */