1 // Check that we can patch and unpatch specific function ids.
2 //
3 // RUN: %clangxx_xray -std=c++11 %s -o %t
4 // RUN: XRAY_OPTIONS="patch_premain=false" %run %t | FileCheck %s
5 // RUN: %clangxx_xray -fno-xray-function-index -std=c++11 %s -o %t
6 // RUN: XRAY_OPTIONS="patch_premain=false" %run %t | FileCheck %s
7
8 // UNSUPPORTED: target-is-mips64,target-is-mips64el
9
10 #include "xray/xray_interface.h"
11
12 #include <set>
13 #include <cstdio>
14 #include <cassert>
15
16 std::set<int32_t> function_ids;
17
coverage_handler(int32_t fid,XRayEntryType)18 [[clang::xray_never_instrument]] void coverage_handler(int32_t fid,
19 XRayEntryType) {
20 thread_local bool patching = false;
21 if (patching) return;
22 patching = true;
23 function_ids.insert(fid);
24 __xray_unpatch_function(fid);
25 patching = false;
26 }
27
baz()28 [[clang::xray_always_instrument]] void baz() {
29 // do nothing!
30 }
31
bar()32 [[clang::xray_always_instrument]] void bar() {
33 baz();
34 }
35
foo()36 [[clang::xray_always_instrument]] void foo() {
37 bar();
38 }
39
main(int argc,char * argv[])40 [[clang::xray_always_instrument]] int main(int argc, char *argv[]) {
41 __xray_set_handler(coverage_handler);
42 assert(__xray_patch() == XRayPatchingStatus::SUCCESS);
43 foo();
44 assert(__xray_unpatch() == XRayPatchingStatus::SUCCESS);
45
46 // print out the function_ids.
47 printf("first pass.\n");
48 for (const auto id : function_ids)
49 printf("patched: %d\n", id);
50
51 // CHECK-LABEL: first pass.
52 // CHECK-DAG: patched: [[F1:.*]]
53 // CHECK-DAG: patched: [[F2:.*]]
54 // CHECK-DAG: patched: [[F3:.*]]
55
56 // make a copy of the function_ids, then patch them later.
57 auto called_fns = function_ids;
58
59 // clear the function_ids.
60 function_ids.clear();
61
62 // patch the functions we've called before.
63 for (const auto id : called_fns)
64 assert(__xray_patch_function(id) == XRayPatchingStatus::SUCCESS);
65
66 // then call them again.
67 foo();
68 assert(__xray_unpatch() == XRayPatchingStatus::SUCCESS);
69
70 // confirm that we've seen the same functions again.
71 printf("second pass.\n");
72 for (const auto id : function_ids)
73 printf("patched: %d\n", id);
74 // CHECK-LABEL: second pass.
75 // CHECK-DAG: patched: [[F1]]
76 // CHECK-DAG: patched: [[F2]]
77 // CHECK-DAG: patched: [[F3]]
78
79 // Now we want to make sure that if we unpatch one, that we're only going to
80 // see two calls of the coverage_handler.
81 function_ids.clear();
82 assert(__xray_patch() == XRayPatchingStatus::SUCCESS);
83 assert(__xray_unpatch_function(1) == XRayPatchingStatus::SUCCESS);
84 foo();
85 assert(__xray_unpatch() == XRayPatchingStatus::SUCCESS);
86
87 // confirm that we don't see function id one called anymore.
88 printf("missing 1.\n");
89 for (const auto id : function_ids)
90 printf("patched: %d\n", id);
91 // CHECK-LABEL: missing 1.
92 // CHECK-NOT: patched: 1
93 }
94