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cppexp.c: Delete SKIP_OPERAND.

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* cppexp.c: Delete SKIP_OPERAND.  Correct priority
	PAREN_INNER_PRIO.
	(_cpp_parse_expr): Check for multiple unary +/- operators.
	Correct priorities of ':' and '?'.  Treat ')' as having a
	value.	Ensure conditional expression is not void.

From-SVN: r32848
This commit is contained in:
Neil Booth 2000-03-31 22:23:59 +00:00 committed by Neil Booth
parent db048faf78
commit eba3052613
2 changed files with 27 additions and 13 deletions
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8
gcc/ChangeLog
View File

@ -1,3 +1,11 @@
2000-03-31 Neil Booth <NeilB@earthling.net>
* cppexp.c: Delete SKIP_OPERAND. Correct priority
PAREN_INNER_PRIO.
(_cpp_parse_expr): Check for multiple unary +/- operators.
Correct priorities of ':' and '?'. Treat ')' as having a
value. Ensure conditional expression is not void.
2000-03-31 Mark Mitchell <mark@codesourcery.com>
* alias.c (canon_rtx): Make it global.

32
gcc/cppexp.c
View File

@ -103,13 +103,6 @@ static struct operation lex PARAMS ((cpp_reader *, int));
#define INT 309
#define CHAR 310
#define LEFT_OPERAND_REQUIRED 1
#define RIGHT_OPERAND_REQUIRED 2
#define HAVE_VALUE 4
/* SKIP_OPERAND is set for '&&' '||' '?' and ':' when the
following operand should be short-circuited instead of evaluated. */
#define SKIP_OPERAND 8
struct operation
{
short op;
@ -644,7 +637,7 @@ right_shift (pfile, a, unsignedp, b)
}
/* These priorities are all even, so we can handle associatively. */
#define PAREN_INNER_PRIO 0
#define PAREN_INNER_PRIO 2
#define COMMA_PRIO 4
#define COND_PRIO (COMMA_PRIO+2)
#define OROR_PRIO (COND_PRIO+2)
@ -660,6 +653,11 @@ right_shift (pfile, a, unsignedp, b)
#define UNARY_PRIO (MUL_PRIO+2)
#define PAREN_OUTER_PRIO (UNARY_PRIO+2)
#define LEFT_OPERAND_REQUIRED 1
#define RIGHT_OPERAND_REQUIRED 2
#define HAVE_VALUE 4
#define SIGN_QUALIFIED 8
#define COMPARE(OP) \
top->unsignedp = 0;\
top->value = (unsigned1 || unsigned2) \
@ -722,9 +720,15 @@ _cpp_parse_expr (pfile)
lprio = PLUS_PRIO;
goto binop;
}
if (top->flags & SIGN_QUALIFIED)
{
cpp_error (pfile, "more than one sign operator given");
goto syntax_error;
}
flags = SIGN_QUALIFIED;
/* else fall through */
case '!': case '~':
flags = RIGHT_OPERAND_REQUIRED;
flags |= RIGHT_OPERAND_REQUIRED;
rprio = UNARY_PRIO; lprio = rprio + 1; goto maybe_reduce;
case '*': case '/': case '%':
lprio = MUL_PRIO; goto binop;
@ -746,12 +750,13 @@ _cpp_parse_expr (pfile)
goto maybe_reduce;
case ')':
lprio = PAREN_INNER_PRIO; rprio = PAREN_OUTER_PRIO;
flags = HAVE_VALUE; /* At least, we will have after reduction. */
goto maybe_reduce;
case ':':
lprio = COND_PRIO; rprio = COND_PRIO;
lprio = COND_PRIO; rprio = COND_PRIO + 1;
goto maybe_reduce;
case '?':
lprio = COND_PRIO + 1; rprio = COND_PRIO;
lprio = COND_PRIO; rprio = COND_PRIO;
goto maybe_reduce;
case ERROR:
goto syntax_error;
@ -974,8 +979,7 @@ _cpp_parse_expr (pfile)
}
break;
case ')':
if ((top[1].flags & HAVE_VALUE)
|| ! (top[0].flags & HAVE_VALUE)
if (! (top[0].flags & HAVE_VALUE)
|| top[0].op != '('
|| (top[-1].flags & HAVE_VALUE))
{
@ -1002,6 +1006,8 @@ _cpp_parse_expr (pfile)
{
if (top != stack)
cpp_ice (pfile, "unbalanced stack in #if expression");
if (!(top->flags & HAVE_VALUE))
cpp_error (pfile, "#if with no expression");
result = (top->value != 0);
goto done;
}