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cppexp.c (lex): Move some code to _cpp_parse_expr, but keep most cases as function eval_token. 

* cppexp.c (lex): Move some code to _cpp_parse_expr, but
	keep most cases as function eval_token.
	(eval_token): New function.
	(_cpp_parse_expr): Read token here for improved diagnostics.
	Don't use op_as_text.  Detect bad ':' here.
	(reduce): Don't detect bad ':' here.
	(op_as_text): Remove.
	* cpphash.h (_cpp_test_assertion): Change prototype.
	* cpplib.c (_cpp_test_assertion): Change prototype.
testsuite:
	* gcc.dg/cpp/if-cexp.c: Add a test.

From-SVN: r52866
This commit is contained in:
Neil Booth 2002-04-28 23:14:56 +00:00 committed by Neil Booth
parent 349a4b40eb
commit 60284a5928
6 changed files with 74 additions and 102 deletions
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12
gcc/ChangeLog
View File

@ -1,3 +1,15 @@
2002-04-29 Neil Booth <neil@daikokuya.demon.co.uk>
* cppexp.c (lex): Move some code to _cpp_parse_expr, but
keep most cases as function eval_token.
(eval_token): New function.
(_cpp_parse_expr): Read token here for improved diagnostics.
Don't use op_as_text. Detect bad ':' here.
(reduce): Don't detect bad ':' here.
(op_as_text): Remove.
* cpphash.h (_cpp_test_assertion): Change prototype.
* cpplib.c (_cpp_test_assertion): Change prototype.
2002-04-28 Richard Henderson <rth@redhat.com>
PR c/5154

153
gcc/cppexp.c
View File

@ -36,8 +36,7 @@ static HOST_WIDEST_INT right_shift PARAMS ((cpp_reader *, HOST_WIDEST_INT,
unsigned HOST_WIDEST_INT));
static struct op parse_number PARAMS ((cpp_reader *, const cpp_token *));
static struct op parse_defined PARAMS ((cpp_reader *));
static struct op lex PARAMS ((cpp_reader *));
static const unsigned char *op_as_text PARAMS ((cpp_reader *, enum cpp_ttype));
static struct op eval_token PARAMS ((cpp_reader *, const cpp_token *));
static struct op *reduce PARAMS ((cpp_reader *, struct op *, enum cpp_ttype));
struct op
@ -275,45 +274,30 @@ parse_defined (pfile)
return op;
}
/* Read a token. The returned type is CPP_NUMBER for a valid number
(an interpreted preprocessing number or character constant, or the
result of the "defined" or "#" operators), CPP_ERROR on error,
CPP_EOF, or the type of an operator token. */
/* Convert a token into a CPP_NUMBER (an interpreted preprocessing
number or character constant, or the result of the "defined" or "#"
operators), or CPP_ERROR on error. */
static struct op
lex (pfile)
eval_token (pfile, token)
cpp_reader *pfile;
const cpp_token *token;
{
unsigned int temp;
struct op op;
const cpp_token *token = cpp_get_token (pfile);
op.op = CPP_NUMBER;
op.unsignedp = 0;
switch (token->type)
{
case CPP_NUMBER:
return parse_number (pfile, token);
case CPP_CHAR:
case CPP_WCHAR:
{
unsigned int chars_seen;
if (token->type == CPP_CHAR)
op.unsignedp = 0;
else
op.unsignedp = WCHAR_UNSIGNED;
op.op = CPP_NUMBER;
op.value = cpp_interpret_charconst (pfile, token, 1, &chars_seen);
return op;
}
case CPP_STRING:
case CPP_WSTRING:
SYNTAX_ERROR ("string constants are not valid in #if");
case CPP_OTHER:
if (ISGRAPH (token->val.c))
SYNTAX_ERROR2 ("invalid character '%c' in #if", token->val.c);
else
SYNTAX_ERROR2 ("invalid character '\\%03o' in #if", token->val.c);
op.unsignedp = WCHAR_UNSIGNED;
case CPP_CHAR: /* Always unsigned. */
op.value = cpp_interpret_charconst (pfile, token, 1, &temp);
break;
case CPP_NAME:
if (token->val.node == pfile->spec_nodes.n_defined)
@ -322,8 +306,6 @@ lex (pfile)
&& (token->val.node == pfile->spec_nodes.n_true
|| token->val.node == pfile->spec_nodes.n_false))
{
op.op = CPP_NUMBER;
op.unsignedp = 0;
op.value = (token->val.node == pfile->spec_nodes.n_true);
/* Warn about use of true or false in #if when pedantic
@ -333,46 +315,22 @@ lex (pfile)
cpp_error (pfile, DL_PEDWARN,
"ISO C++ does not permit \"%s\" in #if",
NODE_NAME (token->val.node));
return op;
}
else
{
op.op = CPP_NUMBER;
op.unsignedp = 0;
op.value = 0;
if (CPP_OPTION (pfile, warn_undef) && !pfile->state.skip_eval)
cpp_error (pfile, DL_WARNING, "\"%s\" is not defined",
NODE_NAME (token->val.node));
return op;
}
break;
case CPP_HASH:
{
int temp;
op.op = CPP_NUMBER;
if (_cpp_test_assertion (pfile, &temp))
op.op = CPP_ERROR;
op.unsignedp = 0;
op.value = temp;
return op;
}
default:
if (((int) token->type > (int) CPP_EQ
&& (int) token->type < (int) CPP_PLUS_EQ))
{
op.op = token->type;
return op;
}
SYNTAX_ERROR2 ("\"%s\" is not valid in #if expressions",
cpp_token_as_text (pfile, token));
default: /* CPP_HASH */
if (_cpp_test_assertion (pfile, &temp))
op.op = CPP_ERROR;
op.value = temp;
}
syntax_error:
op.op = CPP_ERROR;
return op;
}
@ -459,7 +417,7 @@ extra semantics need to be handled with operator-specific code. */
N entries of enum cpp_ttype. */
static const struct operator
{
uchar prio; /* Priorities are even. */
uchar prio;
uchar flags;
} optab[] =
{
@ -539,6 +497,7 @@ _cpp_parse_expr (pfile)
cpp_reader *pfile;
{
struct op *top = pfile->op_stack;
const cpp_token *token = NULL, *prev_token;
unsigned int lex_count;
bool saw_leading_not, want_value = true;
@ -556,19 +515,26 @@ _cpp_parse_expr (pfile)
{
struct op op;
/* Read a token */
op = lex (pfile);
prev_token = token;
token = cpp_get_token (pfile);
lex_count++;
op.op = token->type;
switch (op.op)
{
case CPP_ERROR:
goto syntax_error;
/* These tokens convert into values. */
case CPP_NUMBER:
/* Push a value onto the stack. */
case CPP_CHAR:
case CPP_WCHAR:
case CPP_NAME:
case CPP_HASH:
if (!want_value)
SYNTAX_ERROR ("missing binary operator");
SYNTAX_ERROR2 ("missing binary operator before token \"%s\"",
cpp_token_as_text (pfile, token));
want_value = false;
op = eval_token (pfile, token);
if (op.op == CPP_ERROR)
goto syntax_error;
top->value = op.value;
top->unsignedp = op.unsignedp;
continue;
@ -584,7 +550,16 @@ _cpp_parse_expr (pfile)
if (want_value)
op.op = CPP_UMINUS;
break;
case CPP_OTHER:
if (ISGRAPH (token->val.c))
SYNTAX_ERROR2 ("invalid character '%c' in #if", token->val.c);
else
SYNTAX_ERROR2 ("invalid character '\\%03o' in #if", token->val.c);
default:
if ((int) op.op <= (int) CPP_EQ || (int) op.op >= (int) CPP_PLUS_EQ)
SYNTAX_ERROR2 ("token \"%s\" is not valid in #if expressions",
cpp_token_as_text (pfile, token));
break;
}
@ -592,11 +567,13 @@ _cpp_parse_expr (pfile)
if (optab[op.op].flags & NO_L_OPERAND)
{
if (!want_value)
SYNTAX_ERROR2 ("missing binary operator before '%s'",
op_as_text (pfile, op.op));
SYNTAX_ERROR2 ("missing binary operator before token \"%s\"",
cpp_token_as_text (pfile, token));
}
else if (want_value)
{
/* Ordering here is subtle and intended to favour the
missing parenthesis diagnostics over alternatives. */
if (op.op == CPP_CLOSE_PAREN)
{
if (top->op == CPP_OPEN_PAREN)
@ -606,19 +583,20 @@ _cpp_parse_expr (pfile)
SYNTAX_ERROR ("#if with no expression");
if (top->op != CPP_EOF && top->op != CPP_OPEN_PAREN)
SYNTAX_ERROR2 ("operator '%s' has no right operand",
op_as_text (pfile, top->op));
cpp_token_as_text (pfile, prev_token));
}
top = reduce (pfile, top, op.op);
if (!top)
goto syntax_error;
if (op.op == CPP_EOF)
break;
switch (op.op)
{
case CPP_CLOSE_PAREN:
continue;
case CPP_EOF:
goto done;
case CPP_OR_OR:
if (top->value)
pfile->state.skip_eval++;
@ -629,6 +607,8 @@ _cpp_parse_expr (pfile)
pfile->state.skip_eval++;
break;
case CPP_COLON:
if (top->op != CPP_QUERY)
SYNTAX_ERROR (" ':' without preceding '?'");
if (top[-1].value) /* Was '?' condition true? */
pfile->state.skip_eval++;
else
@ -646,7 +626,6 @@ _cpp_parse_expr (pfile)
top->op = op.op;
}
done:
/* The controlling macro expression is only valid if we called lex 3
times: <!> <defined expression> and <EOF>. push_conditional ()
checks that we are at top-of-file. */
@ -693,8 +672,7 @@ reduce (pfile, top, op)
switch (top[1].op)
{
default:
cpp_error (pfile, DL_ICE, "impossible operator '%s'",
op_as_text (pfile, top[1].op));
cpp_error (pfile, DL_ICE, "impossible operator '%u'", top[1].op);
return 0;
case CPP_NOT: UNARY(!); break;
@ -806,11 +784,6 @@ reduce (pfile, top, op)
cpp_error (pfile, DL_ERROR, "'?' without following ':'");
return 0;
case CPP_COLON:
if (top->op != CPP_QUERY)
{
cpp_error (pfile, DL_ERROR, " ':' without preceding '?'");
return 0;
}
top--;
if (top->value) pfile->state.skip_eval--;
top->value = top->value ? v1 : v2;
@ -849,21 +822,3 @@ _cpp_expand_op_stack (pfile)
return pfile->op_stack + n;
}
/* Output OP as text for diagnostics. */
static const unsigned char *
op_as_text (pfile, op)
cpp_reader *pfile;
enum cpp_ttype op;
{
cpp_token token;
if (op == CPP_UPLUS)
op = CPP_PLUS;
else if (op == CPP_UMINUS)
op = CPP_MINUS;
token.type = op;
token.flags = 0;
return cpp_token_as_text (pfile, &token);
}

2
gcc/cpphash.h
View File

@ -413,7 +413,7 @@ extern void _cpp_init_tokenrun PARAMS ((tokenrun *, unsigned int));
extern void _cpp_maybe_push_include_file PARAMS ((cpp_reader *));
/* In cpplib.c */
extern int _cpp_test_assertion PARAMS ((cpp_reader *, int *));
extern int _cpp_test_assertion PARAMS ((cpp_reader *, unsigned int *));
extern int _cpp_handle_directive PARAMS ((cpp_reader *, int));
extern void _cpp_define_builtin PARAMS ((cpp_reader *, const char *));
extern void _cpp_do__Pragma PARAMS ((cpp_reader *));

2
gcc/cpplib.c
View File

@ -1652,7 +1652,7 @@ find_answer (node, candidate)
int
_cpp_test_assertion (pfile, value)
cpp_reader *pfile;
int *value;
unsigned int *value;
{
struct answer *answer;
cpp_hashnode *node;

4
gcc/testsuite/ChangeLog
View File

@ -1,3 +1,7 @@
2002-04-29 Neil Booth <neil@daikokuya.demon.co.uk>
* gcc.dg/cpp/if-cexp.c: Add a test.
2002-04-28 Jakub Jelinek <jakub@redhat.com>
* gcc.dg/20020426-2.c: New test.

3
gcc/testsuite/gcc.dg/cpp/if-cexp.c
View File

@ -10,4 +10,5 @@
#error OK /* { dg-error "OK" "nested ? : with parens" } */
#endif
#if 2: /* { dg-error "':' without" "immediate :" } */
#endif