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Re: gcc's C parser bitten by error recovery changes in bison 1.50
- From: Zack Weinberg <zack at codesourcery dot com>
- To: gcc-bugs at gcc dot gnu dot org, gcc-patches at gcc dot gnu dot org
- Cc: help-bison at gnu dot org
- Date: Thu, 17 Oct 2002 23:08:33 -0700
- Subject: Re: gcc's C parser bitten by error recovery changes in bison 1.50
- References: <20021016020117.GQ15067@codesourcery.com>
On Tue, Oct 15, 2002 at 07:01:17PM -0700, Zack Weinberg wrote:
> When bison 1.50 is used to build GCC mainline, we get a number of
> testsuite failures:
>
> FAIL: gcc.dg/noncompile/920923-1.c (test for errors, line 69)
> FAIL: gcc.dg/noncompile/920923-1.c (test for errors, line 72)
> FAIL: gcc.dg/noncompile/920923-1.c (test for errors, line 74)
>
> (repeated for every combination of -O switches). Error messages are
> not being issued when expected.
Here is a patch that makes 920923-1.c not care what error messages are
issued.
zw
* gcc.dg/noncompile/920923-1.c: Don't attempt to enumerate all
the error messages that are expected.
===================================================================
Index: testsuite/gcc.dg/noncompile/920923-1.c
--- testsuite/gcc.dg/noncompile/920923-1.c 15 Nov 2001 03:55:26 -0000 1.4
+++ testsuite/gcc.dg/noncompile/920923-1.c 18 Oct 2002 06:08:04 -0000
@@ -1,35 +1,49 @@
-typedef BYTE unsigned char; /* { dg-error "syntax error|empty decl" } */
+/* This test case contains a large number of syntactic errors. We
+ believe the intent of the test is that the compiler simply not
+ crash. The set of error messages reported is different when the C
+ parser is generated with bison 1.50 than 1.35. It is not worth
+ attempting to prevent this. Instead, we use a single dg-error with
+ a regexp that will match _all_ the errors indiscriminately. The
+ old error/warning/etc markers are kept around for reference, but
+ disabled.
+
+ Revisit after new (recursive descent) parser is implemented for C.
+ -- zw 2002-10-17 */
+
+/* { dg-error ".*" "many syntax errors" { target *-*-* } 0 } */
+
+typedef BYTE unsigned char; /* { error "syntax error|empty decl" } */
typedef int item_n;
typedef int perm_set;
-struct PENT { caddr_t v_addr; };/* { dg-error "parse error|no semicolon" } */
+struct PENT { caddr_t v_addr; };/* { error "parse error|no semicolon" } */
typedef struct PENT prec;
typedef struct PENT *prec_t;
prec_t mem_hash;
-BYTE *mem_base; /* { dg-error "parse error|no type" } */
+BYTE *mem_base; /* { error "parse error|no type" } */
struct PTE {
- BYTE *p_page; /* { dg-error "parse error|no semicolon" } */
+ BYTE *p_page; /* { error "parse error|no semicolon" } */
perm_set p_perms;
-}; /* { dg-error "parse error" } */
+}; /* { error "parse error" } */
typedef struct PTE pte;
struct PTP {
union {
- struct *PTP p_tablep; /* { dg-error "parse error|no semicolon" } */
+ struct *PTP p_tablep; /* { error "parse error|no semicolon" } */
struct *PTE p_entry;
- } u; /* { dg-warning "no type or storage class" } */
+ } u; /* { warning "no type or storage class" } */
int valid;
-}; /* { dg-error "parse error" } */
-typedef struct PTP (u.p_tablep);/* { dg-error "parse error" } */
+}; /* { error "parse error" } */
+typedef struct PTP (u.p_tablep);/* { error "parse error" } */
int pfree=0;
int pcount=0;
void
mmu_walk_find(va)
-caddr_t va; /* { dg-error "parse error|no type" } */
+caddr_t va; /* { error "parse error|no type" } */
{
BYTE *page_addr;
if (mmu_base[Level1(va)]->valid==0x0) {
l1_base = mmu_base[Level1(va)]->(u.p_tablep) = p_alloc();
- mmu_base[Level1(va)]->valid = 0x3; /* { dg-error "parse error" } */
+ mmu_base[Level1(va)]->valid = 0x3; /* { error "parse error" } */
for (idx=0; idx<LEVEL1_ENTRIES; idx++)
l1_base[idx]->valid = 0x0;
goto build_level2;
@@ -39,43 +53,43 @@ caddr_t va; /* { dg-error "parse error
if (l1_base[Level2(va)]->valid==0x0) {
build_level2:
l2_base = l1_base[Level2(va)]->(u.p_tablep) = p_alloc();
- l1_base[Level2(va)]->valid = 0x3; /* { dg-error "parse error" } */
+ l1_base[Level2(va)]->valid = 0x3; /* { error "parse error" } */
for (idx=0; idx<LEVEL2_ENTRIES; idx++)
l2_base[idx]->valid=0x0;
goto build_page;
} else
l2_base = mmu_base[Level2(va)]->(u.p_tablep);
- page_addr = l2_base[Level2(va)]->valid;/* { dg-error "undeclared|no type" } */
-} /* { dg-error "parse error" } */
+ page_addr = l2_base[Level2(va)]->valid;/* { error "undeclared|no type" } */
+} /* { error "parse error" } */
void *
a_translate(va_op, v_addr)
int va_op;
-caddr_t v_addr; /* { dg-error "parse error" } */
+caddr_t v_addr; /* { error "parse error" } */
{
register prec_t bucket;
- register caddr_t p_addr; /* { dg-error "syntax error" } */
- bucket = mem_hash+((((v_addr)>>ITEMBITS))&hash_mask); /* { dg-error "undeclared|for each function" } */
+ register caddr_t p_addr; /* { error "syntax error" } */
+ bucket = mem_hash+((((v_addr)>>ITEMBITS))&hash_mask); /* { error "undeclared|for each function" } */
do {
- if (bucket->v_addr == ((v_addr)>>ITEMBITS) { /* { dg-error "incomplete type|parse error" } */
+ if (bucket->v_addr == ((v_addr)>>ITEMBITS) { /* { error "incomplete type|parse error" } */
if(!(bucket->perm_set&va_op))
goto prot_fault;
return mem_base + v_addr;
}
- } while((bucket++)->v_addr != ((caddr_t)0)); /* { dg-error "parse error" } */
+ } while((bucket++)->v_addr != ((caddr_t)0)); /* { error "parse error" } */
page_miss:
- p_addr = (--bucket)->p_addr; /* { dg-error "undeclared|pointer to" } */
+ p_addr = (--bucket)->p_addr; /* { error "undeclared|pointer to" } */
page_type:
switch (p_addr) {
- case BUCKET_FULL: /* { dg-error "undeclared" } */
+ case BUCKET_FULL: /* { error "undeclared" } */
enlarge_hash_table(mem_hash);
- case((caddr_t)0): /* { dg-error "undeclared|parse error" } */
+ case((caddr_t)0): /* { error "undeclared|parse error" } */
p_addr = fill_item_entry(va_op, v_addr);
goto page_type;
- case((caddr_t)1): /* { dg-error "parse error" } */
- default:
+ case((caddr_t)1): /* { error "parse error" } */
+ default:
((void)(((0))?0:(__eprintf("Failed assertion`%s'at line%d of`%s'.\n",
"FALSE", 327, "b.c"), 0)));
}
@@ -90,9 +104,9 @@ int hash_size;
register int idx;
bucket = hasht;
for(idx=(hash_size*3)-1; idx>=0; idx--) {
- bucket->v_addr = ((caddr_t)0);/* { dg-error "undeclared|pointer to|parse error" } */
- bucket->p_addr = ((caddr_t)0);/* { dg-error "pointer to|parse error" } */
- bucket->perm_set = VA_EMPTY; /* { dg-error "undeclared|pointer to" } */
+ bucket->v_addr = ((caddr_t)0);/* { error "undeclared|pointer to|parse error" } */
+ bucket->p_addr = ((caddr_t)0);/* { error "pointer to|parse error" } */
+ bucket->perm_set = VA_EMPTY; /* { error "undeclared|pointer to" } */
}
}
@@ -101,21 +115,21 @@ extern void *calloc(__SIZE_TYPE__, __SIZ
void
init_mem()
{
- mem_base = (BYTE *) calloc(1024, (1<<13)); /* { dg-error "undeclared|parse error" } */
- ((void)((mem_base != (BYTE *)0) /* { dg-error "parse error" } */
+ mem_base = (BYTE *) calloc(1024, (1<<13)); /* { error "undeclared|parse error" } */
+ ((void)((mem_base != (BYTE *)0) /* { error "parse error" } */
? 0
: (__eprintf("Failed assertion`%s'at line%d of`%s'.\n",
"mem_base != (BYTE *)0", 366, "b.c"),
0)));
- hash_num = INIT_NUM_ENTRIES * 3; /* { dg-error "undeclared" } */
- mem_hash = (prec_t) calloc(hash_num, sizeof(prec)); /* { dg-error "incomplete type" } */
+ hash_num = INIT_NUM_ENTRIES * 3; /* { error "undeclared" } */
+ mem_hash = (prec_t) calloc(hash_num, sizeof(prec)); /* { error "incomplete type" } */
((void)((mem_hash != (prec_t)0)
? 0
: (__eprintf("Failed assertion`%s'at line%d of`%s'.\n",
"mem_hash != (prec_t)0", 370, "b.c"),
0)));
flush_hash(mem_hash, 32);
- build_ptables(mem_base, 1024*(1<<13)); /* { dg-bogus "integer overflow" "int smaller than 32 bits" { xfail "xstormy16-*-*" } } */
+ build_ptables(mem_base, 1024*(1<<13)); /* { bogus "integer overflow" "int smaller than 32 bits" { xfail "xstormy16-*-*" } } */
}
struct tm {