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| // Check that we can patch and unpatch specific function ids.
//
// RUN: %clangxx_xray -std=c++11 %s -o %t
// RUN: XRAY_OPTIONS="patch_premain=false xray_naive_log=false" %run %t | FileCheck %s
// UNSUPPORTED: target-is-mips64,target-is-mips64el
#include "xray/xray_interface.h"
#include <set>
#include <cstdio>
#include <cassert>
std::set<int32_t> function_ids;
[[clang::xray_never_instrument]] void coverage_handler(int32_t fid,
XRayEntryType) {
thread_local bool patching = false;
if (patching) return;
patching = true;
function_ids.insert(fid);
__xray_unpatch_function(fid);
patching = false;
}
[[clang::xray_always_instrument]] void baz() {
// do nothing!
}
[[clang::xray_always_instrument]] void bar() {
baz();
}
[[clang::xray_always_instrument]] void foo() {
bar();
}
[[clang::xray_always_instrument]] int main(int argc, char *argv[]) {
__xray_set_handler(coverage_handler);
assert(__xray_patch() == XRayPatchingStatus::SUCCESS);
foo();
assert(__xray_unpatch() == XRayPatchingStatus::SUCCESS);
// print out the function_ids.
printf("first pass.\n");
for (const auto id : function_ids)
printf("patched: %d\n", id);
// CHECK-LABEL: first pass.
// CHECK-DAG: patched: [[F1:.*]]
// CHECK-DAG: patched: [[F2:.*]]
// CHECK-DAG: patched: [[F3:.*]]
// make a copy of the function_ids, then patch them later.
auto called_fns = function_ids;
// clear the function_ids.
function_ids.clear();
// patch the functions we've called before.
for (const auto id : called_fns)
assert(__xray_patch_function(id) == XRayPatchingStatus::SUCCESS);
// then call them again.
foo();
assert(__xray_unpatch() == XRayPatchingStatus::SUCCESS);
// confirm that we've seen the same functions again.
printf("second pass.\n");
for (const auto id : function_ids)
printf("patched: %d\n", id);
// CHECK-LABEL: second pass.
// CHECK-DAG: patched: [[F1]]
// CHECK-DAG: patched: [[F2]]
// CHECK-DAG: patched: [[F3]]
// Now we want to make sure that if we unpatch one, that we're only going to
// see two calls of the coverage_handler.
function_ids.clear();
assert(__xray_patch() == XRayPatchingStatus::SUCCESS);
assert(__xray_unpatch_function(1) == XRayPatchingStatus::SUCCESS);
foo();
assert(__xray_unpatch() == XRayPatchingStatus::SUCCESS);
// confirm that we don't see function id one called anymore.
printf("missing 1.\n");
for (const auto id : function_ids)
printf("patched: %d\n", id);
// CHECK-LABEL: missing 1.
// CHECK-NOT: patched: 1
}
|