bb6fdd66fc
Summary: This bug is caused by the incorrect handling of return-value registers. According to OpenPOWER 64-Bit ELF V2 ABI 2.2.5, up to 2 general-purpose registers are going to be used for return values, and up to 8 floating point registers or vector registers are going to be used for return values. Reviewers: dberris, echristo Subscribers: nemanjai, llvm-commits Differential Revision: https://reviews.llvm.org/D33027 llvm-svn: 302691
89 lines
2.2 KiB
C++
89 lines
2.2 KiB
C++
// Check that we can patch and unpatch specific function ids.
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//
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// RUN: %clangxx_xray -std=c++11 %s -o %t
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// RUN: XRAY_OPTIONS="patch_premain=false xray_naive_log=false" %run %t | FileCheck %s
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#include "xray/xray_interface.h"
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#include <set>
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#include <cstdio>
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std::set<int32_t> function_ids;
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[[clang::xray_never_instrument]] void coverage_handler(int32_t fid,
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XRayEntryType) {
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thread_local bool patching = false;
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if (patching) return;
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patching = true;
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function_ids.insert(fid);
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__xray_unpatch_function(fid);
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patching = false;
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}
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[[clang::xray_always_instrument]] void baz() {
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// do nothing!
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}
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[[clang::xray_always_instrument]] void bar() {
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baz();
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}
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[[clang::xray_always_instrument]] void foo() {
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bar();
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}
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[[clang::xray_always_instrument]] int main(int argc, char *argv[]) {
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__xray_set_handler(coverage_handler);
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__xray_patch();
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foo();
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__xray_unpatch();
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// print out the function_ids.
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printf("first pass.\n");
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for (const auto id : function_ids)
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printf("patched: %d\n", id);
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// CHECK-LABEL: first pass.
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// CHECK-DAG: patched: [[F1:.*]]
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// CHECK-DAG: patched: [[F2:.*]]
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// CHECK-DAG: patched: [[F3:.*]]
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// make a copy of the function_ids, then patch them later.
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auto called_fns = function_ids;
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// clear the function_ids.
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function_ids.clear();
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// patch the functions we've called before.
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for (const auto id : called_fns)
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__xray_patch_function(id);
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// then call them again.
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foo();
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__xray_unpatch();
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// confirm that we've seen the same functions again.
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printf("second pass.\n");
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for (const auto id : function_ids)
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printf("patched: %d\n", id);
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// CHECK-LABEL: second pass.
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// CHECK-DAG: patched: [[F1]]
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// CHECK-DAG: patched: [[F2]]
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// CHECK-DAG: patched: [[F3]]
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// Now we want to make sure that if we unpatch one, that we're only going to
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// see two calls of the coverage_handler.
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function_ids.clear();
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__xray_patch();
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__xray_unpatch_function(1);
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foo();
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__xray_unpatch();
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// confirm that we don't see function id one called anymore.
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printf("missing 1.\n");
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for (const auto id : function_ids)
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printf("patched: %d\n", id);
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// CHECK-LABEL: missing 1.
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// CHECK-NOT: patched: 1
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}
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