1 // RUN: %clang_dfsan -gmlt %s -o %t && %run %t >%t.out 2>&1 2 // RUN: FileCheck %s < %t.out 3 // 4 // REQUIRES: x86_64-target-arch 5 6 #include <assert.h> 7 #include <sanitizer/dfsan_interface.h> 8 #include <stdio.h> 9 #include <string.h> 10 11 #define NOINLINE __attribute__((noinline)) 12 13 NOINLINE size_t bar(int depth, char *buf, size_t len) { 14 if (!depth) { 15 return dfsan_sprint_stack_trace(buf, len); 16 } 17 18 return bar(depth - 1, buf, len); 19 } 20 21 NOINLINE size_t baz(int depth, char *buf, size_t len) { 22 return bar(depth, buf, len); 23 } 24 25 int main(int argc, char *argv[]) { 26 char buf[3000]; 27 size_t length = dfsan_sprint_stack_trace(buf, sizeof(buf)); 28 assert(length < sizeof(buf)); 29 printf("==OUTPUT==\n%s==EOS==\n", buf); 30 31 // CHECK: ==OUTPUT== 32 // CHECK: #0 {{.*}} in main [[FILEPATH:.*]]/stack_trace.c:[[# @LINE - 5 ]] 33 // CHECK: ==EOS== 34 35 length = baz(8, buf, sizeof(buf)); 36 printf("==OUTPUT==\n%s==EOS==\n", buf); 37 38 // CHECK: ==OUTPUT== 39 // CHECK: #0 {{.*}} in bar.dfsan [[FILEPATH]]/stack_trace.c:15 40 // CHECK-COUNT-8: #{{[1-9]+}} {{.*}} in bar.dfsan [[FILEPATH]]/stack_trace.c:18 41 // CHECK: #9 {{.*}} in baz.dfsan [[FILEPATH]]/stack_trace.c:22 42 // CHECK: #10 {{.*}} in main [[FILEPATH]]/stack_trace.c:[[# @LINE - 7 ]] 43 // CHECK: ==EOS== 44 45 char tinybuf[8]; 46 size_t same_length = baz(8, tinybuf, sizeof(tinybuf)); 47 48 printf("==TRUNCATED OUTPUT==\n%s==EOS==\n", tinybuf); 49 // CHECK: ==TRUNCATED OUTPUT== 50 // CHECK: #0 ==EOS== 51 52 printf("Returned length: %zu\n", length); 53 printf("Actual length: %zu\n", strlen(buf)); 54 printf("Returned length with truncation: %zu\n", same_length); 55 56 // CHECK: Returned length: [[#LEN:]] 57 // CHECK: Actual length: [[#LEN]] 58 // CHECK: Returned length with truncation: [[#LEN]] 59 60 buf[0] = '\0'; 61 length = baz(8, buf, 0); 62 printf("Output=\"%s\"\n", buf); 63 printf("Returned length: %zu\n", length); 64 // CHECK: Output="" 65 // CHECK: Returned length: [[#LEN]] 66 } 67