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testsuite: Remove fragile stack pointer checks

Browse Source 
testsuite/libffi.call/closure_stdcall.c and
testsuite/libffi.call/closure_thiscall.c include inline assembly to save
the stack pointer before and after the call, and compare the values.
However, compilers can and do leave the stack in different states for
these two pieces of inline assembly, such as by saving a temporary value
on the stack across the call; observed with gcc -Os, and verified as
spurious through careful inspection of disassembly.
This commit is contained in:
Josh Triplett
2014-03-16 02:31:19 -07:00
parent 82f8cb24a1
commit 9c279328ee
2 changed files with 0 additions and 32 deletions
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16
testsuite/libffi.call/closure_stdcall.c
View File

@@ -32,9 +32,6 @@ int main (void)
ffi_closure *pcl = ffi_closure_alloc(sizeof(ffi_closure), &code);
ffi_type * cl_arg_types[17];
int res;
void* sp_pre;
void* sp_post;
char buf[1024];
cl_arg_types[0] = &ffi_type_uint;
cl_arg_types[1] = &ffi_type_uint;
@@ -49,24 +46,11 @@ int main (void)
CHECK(ffi_prep_closure_loc(pcl, &cif, closure_test_stdcall,
(void *) 3 /* userdata */, code) == FFI_OK);
#ifdef _MSC_VER
__asm { mov sp_pre, esp }
#else
asm volatile (" movl %%esp,%0" : "=g" (sp_pre));
#endif
res = (*(closure_test_type0)code)(0, 1, 2, 3);
#ifdef _MSC_VER
__asm { mov sp_post, esp }
#else
asm volatile (" movl %%esp,%0" : "=g" (sp_post));
#endif
/* { dg-output "0 1 2 3: 9" } */
printf("res: %d\n",res);
/* { dg-output "\nres: 9" } */
sprintf(buf, "mismatch: pre=%p vs post=%p", sp_pre, sp_post);
printf("stack pointer %s\n", (sp_pre == sp_post ? "match" : buf));
/* { dg-output "\nstack pointer match" } */
exit(0);
}

16
testsuite/libffi.call/closure_thiscall.c
View File

@@ -32,9 +32,6 @@ int main (void)
ffi_closure *pcl = ffi_closure_alloc(sizeof(ffi_closure), &code);
ffi_type * cl_arg_types[17];
int res;
void* sp_pre;
void* sp_post;
char buf[1024];
cl_arg_types[0] = &ffi_type_uint;
cl_arg_types[1] = &ffi_type_uint;
@@ -49,24 +46,11 @@ int main (void)
CHECK(ffi_prep_closure_loc(pcl, &cif, closure_test_thiscall,
(void *) 3 /* userdata */, code) == FFI_OK);
#ifdef _MSC_VER
__asm { mov sp_pre, esp }
#else
asm volatile (" movl %%esp,%0" : "=g" (sp_pre));
#endif
res = (*(closure_test_type0)code)(0, 1, 2, 3);
#ifdef _MSC_VER
__asm { mov sp_post, esp }
#else
asm volatile (" movl %%esp,%0" : "=g" (sp_post));
#endif
/* { dg-output "0 1 2 3: 9" } */
printf("res: %d\n",res);
/* { dg-output "\nres: 9" } */
sprintf(buf, "mismatch: pre=%p vs post=%p", sp_pre, sp_post);
printf("stack pointer %s\n", (sp_pre == sp_post ? "match" : buf));
/* { dg-output "\nstack pointer match" } */
exit(0);
}