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