mirror of
https://github.com/llvm/llvm-project.git
synced 2025-04-29 10:16:05 +00:00
42af651358
Summary: We define the `__xray_customeevent` builtin that gets translated to IR calls to the correct intrinsic. The default implementation of this is a no-op function. The codegen side of this follows the following logic: - When `-fxray-instrument` is not provided in the driver, we elide all calls to `__xray_customevent`. - When `-fxray-instrument` is enabled and a function is marked as "never instrumented", we elide all calls to `__xray_customevent` in that function; if either marked as "always instrumented" or subject to threshold-based instrumentation, we emit a call to the `llvm.xray.customevent` intrinsic from LLVM for each `__xray_customevent` occurrence in the function. This change depends on D27503 (to land in LLVM first). Reviewers: echristo, rsmith Subscribers: mehdi_amini, pelikan, lrl, cfe-commits Differential Revision: https://reviews.llvm.org/D30018 llvm-svn: 302492
29 lines
1.0 KiB
C++
29 lines
1.0 KiB
C++
// RUN: %clang_cc1 -fxray-instrument -x c++ -std=c++11 -triple x86_64-unknown-unknown -emit-llvm -o - %s | FileCheck %s
|
|
|
|
// CHECK-LABEL: @_Z16alwaysInstrumentv
|
|
[[clang::xray_always_instrument]] void alwaysInstrument() {
|
|
static constexpr char kPhase[] = "instrument";
|
|
__xray_customevent(kPhase, 10);
|
|
// CHECK: call void @llvm.xray.customevent(i8*{{.*}}, i32 10)
|
|
}
|
|
|
|
// CHECK-LABEL: @_Z15neverInstrumentv
|
|
[[clang::xray_never_instrument]] void neverInstrument() {
|
|
static constexpr char kPhase[] = "never";
|
|
__xray_customevent(kPhase, 5);
|
|
// CHECK-NOT: call void @llvm.xray.customevent(i8*{{.*}}, i32 5)
|
|
}
|
|
|
|
// CHECK-LABEL: @_Z21conditionalInstrumenti
|
|
[[clang::xray_always_instrument]] void conditionalInstrument(int v) {
|
|
static constexpr char kTrue[] = "true";
|
|
static constexpr char kUntrue[] = "untrue";
|
|
if (v % 2)
|
|
__xray_customevent(kTrue, 4);
|
|
else
|
|
__xray_customevent(kUntrue, 6);
|
|
|
|
// CHECK: call void @llvm.xray.customevent(i8*{{.*}}, i32 4)
|
|
// CHECK: call void @llvm.xray.customevent(i8*{{.*}}, i32 6)
|
|
}
|