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Hack around over-optimized labels-as-values extension from GCC.

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This commit is contained in:
gbeauche 2008-01-06 16:19:27 +00:00
parent e08bb16edf
commit a56e4b9be0
1 changed files with 38 additions and 20 deletions
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58
BasiliskII/src/Unix/sigsegv.cpp
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@ -2389,18 +2389,30 @@ int main(void)
if (!sigsegv_install_handler(sigsegv_test_handler))
return 4;
#ifdef __GNUC__
b_region = &&L_b_region1;
e_region = &&L_e_region1;
#endif
L_b_region1:
page[REF_INDEX] = REF_VALUE;
if (page[REF_INDEX] != REF_VALUE)
exit(20);
page[REF_INDEX] = REF_VALUE;
BARRIER();
L_e_region1:
/* This is a really awful hack but otherwise gcc is smart enough
* (or bug'ous enough?) to optimize the labels and place them
* e.g. at the "main" entry point, which is wrong.
*/
volatile int label_hack = 1;
switch (label_hack) {
case 1:
L_b_region1:
page[REF_INDEX] = REF_VALUE;
if (page[REF_INDEX] != REF_VALUE)
exit(20);
page[REF_INDEX] = REF_VALUE;
BARRIER();
// fall-through
case 2:
L_e_region1:
BARRIER();
break;
}
if (handler_called != 1)
return 5;
@ -2431,18 +2443,24 @@ int main(void)
b_region = &&L_b_region2;
e_region = &&L_e_region2;
#endif
L_b_region2:
TEST_SKIP_INSTRUCTION(unsigned char);
TEST_SKIP_INSTRUCTION(unsigned short);
TEST_SKIP_INSTRUCTION(unsigned int);
TEST_SKIP_INSTRUCTION(unsigned long);
TEST_SKIP_INSTRUCTION(signed char);
TEST_SKIP_INSTRUCTION(signed short);
TEST_SKIP_INSTRUCTION(signed int);
TEST_SKIP_INSTRUCTION(signed long);
BARRIER();
L_e_region2:
switch (label_hack) {
case 1:
L_b_region2:
TEST_SKIP_INSTRUCTION(unsigned char);
TEST_SKIP_INSTRUCTION(unsigned short);
TEST_SKIP_INSTRUCTION(unsigned int);
TEST_SKIP_INSTRUCTION(unsigned long);
TEST_SKIP_INSTRUCTION(signed char);
TEST_SKIP_INSTRUCTION(signed short);
TEST_SKIP_INSTRUCTION(signed int);
TEST_SKIP_INSTRUCTION(signed long);
BARRIER();
// fall-through
case 2:
L_e_region2:
BARRIER();
break;
}
if (!arch_insn_skipper_tests())
return 20;
#endif