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[asan] Make dump_registers.cc more stable
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Authored by kubamracek on Aug 2 2017, 10:35 AM.

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This revision is now accepted and ready to land.Aug 2 2017, 2:26 PM

This revision was automatically updated to reflect the committed changes.

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test/

asan/

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	// Check that ASan dumps the CPU registers on a SIGSEGV.			// Check that ASan dumps the CPU registers on a SIGSEGV.

	// RUN: %clangxx_asan %s -o %t			// RUN: %clangxx_asan %s -o %t
	// RUN: not %run %t 2>&1 \| FileCheck %s			// RUN: not %run %t 2>&1 \| FileCheck %s

	#include <assert.h>			#include <assert.h>
	#include <stdio.h>			#include <stdio.h>
				#include <sys/mman.h>

	int main() {			int main() {
	fprintf(stderr, "Hello\n");			fprintf(stderr, "Hello\n");
	char *ptr;			char *ptr;

	if (sizeof(void *) == 8)			ptr = (char *)mmap(NULL, 0x10000, PROT_NONE, MAP_ANON \| MAP_PRIVATE, -1, 0);
	ptr = (char *)0x6666666666666666;			assert(ptr && "failed to mmap");
	else if (sizeof(void *) == 4)
	ptr = (char *)0x55555555;			fprintf(stderr, sizeof(uintptr_t) == 8 ? "p = 0x%016lx\n" : "p = 0x%08lx\n", (uintptr_t)ptr);
	else			// CHECK: p = [[ADDR:0x[0-9]+]]
	assert(0 && "Your computer is weird.");

	char c = *ptr; // BOOM			char c = *ptr; // BOOM
	// CHECK: ERROR: AddressSanitizer: {{SEGV\|BUS}}			// CHECK: ERROR: AddressSanitizer: {{SEGV\|BUS}}
	// CHECK: Register values:			// CHECK: Register values:
	// CHECK: {{0x55555555\|0x6666666666666666}}			// CHECK: [[ADDR]]
	fprintf(stderr, "World\n");			fprintf(stderr, "World\n");
	return c;			return c;
	}			}