[clang] 4113e15 - [clang][PGO] Apply artificial DebugLoc to llvm.instrprof.increment instructions (#90717)
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Thu May 2 15:18:21 PDT 2024
Author: Michael Buch
Date: 2024-05-02T23:18:16+01:00
New Revision: 4113e15153d5af39a12c6bcf16e6b35614dc13a2
URL: https://github.com/llvm/llvm-project/commit/4113e15153d5af39a12c6bcf16e6b35614dc13a2
DIFF: https://github.com/llvm/llvm-project/commit/4113e15153d5af39a12c6bcf16e6b35614dc13a2.diff
LOG: [clang][PGO] Apply artificial DebugLoc to llvm.instrprof.increment instructions (#90717)
Prior to this change the debug-location for the
`llvm.instrprof.increment` intrinsic was set to whatever the current
DIBuilder's current debug location was set to. This meant that for
switch-statements, a counter's location was set to the previous case's
debug-location, causing confusing stepping behaviour in debuggers. This
patch makes sure we attach a dummy debug-location for the increment
instructions.
rdar://123050737
Added:
clang/test/Profile/debug-info-instr_profile_switch.cpp
Modified:
clang/lib/CodeGen/CodeGenFunction.h
Removed:
################################################################################
diff --git a/clang/lib/CodeGen/CodeGenFunction.h b/clang/lib/CodeGen/CodeGenFunction.h
index 6e7417fc7f52b6..ba24831b158662 100644
--- a/clang/lib/CodeGen/CodeGenFunction.h
+++ b/clang/lib/CodeGen/CodeGenFunction.h
@@ -1648,8 +1648,10 @@ class CodeGenFunction : public CodeGenTypeCache {
void incrementProfileCounter(const Stmt *S, llvm::Value *StepV = nullptr) {
if (CGM.getCodeGenOpts().hasProfileClangInstr() &&
!CurFn->hasFnAttribute(llvm::Attribute::NoProfile) &&
- !CurFn->hasFnAttribute(llvm::Attribute::SkipProfile))
+ !CurFn->hasFnAttribute(llvm::Attribute::SkipProfile)) {
+ auto AL = ApplyDebugLocation::CreateArtificial(*this);
PGO.emitCounterSetOrIncrement(Builder, S, StepV);
+ }
PGO.setCurrentStmt(S);
}
diff --git a/clang/test/Profile/debug-info-instr_profile_switch.cpp b/clang/test/Profile/debug-info-instr_profile_switch.cpp
new file mode 100644
index 00000000000000..205195a0e1225c
--- /dev/null
+++ b/clang/test/Profile/debug-info-instr_profile_switch.cpp
@@ -0,0 +1,40 @@
+// Tests that we don't attach misleading debug locations to llvm.instrprof.increment
+// counters.
+
+// RUN: %clang_cc1 -x c++ %s -debug-info-kind=standalone -triple %itanium_abi_triple -main-file-name debug-info-instr_profile_switch.cpp -std=c++11 -o - -emit-llvm -fprofile-instrument=clang | FileCheck %s
+
+int main(int argc, const char *argv[]) {
+ switch(argc) {
+ case 0:
+ return 0;
+ case 1:
+ return 1;
+ }
+}
+
+// CHECK: define {{.*}} @main(i32 noundef %argc, ptr noundef %argv) #0 !dbg ![[MAIN_SCOPE:[0-9]+]]
+
+// CHECK: switch i32 {{.*}}, label {{.*}} [
+// CHECK-NEXT: i32 0, label %[[CASE1_LBL:[a-z0-9.]+]]
+// CHECK-NEXT: i32 1, label %[[CASE2_LBL:[a-z0-9.]+]]
+// CHECK-NEXT: ], !dbg ![[SWITCH_LOC:[0-9]+]]
+
+// CHECK: [[CASE1_LBL]]:
+// CHECK-NEXT: %{{.*}} = load i64, ptr getelementptr inbounds ({{.*}}, ptr @__profc_main, {{.*}}), align {{.*}}, !dbg ![[CTR_LOC:[0-9]+]]
+// CHECK-NEXT: %{{.*}} = add {{.*}}, !dbg ![[CTR_LOC]]
+// CHECK-NEXT: store i64 {{.*}}, ptr getelementptr inbounds ({{.*}}, ptr @__profc_main, {{.*}}), align {{.*}}, !dbg ![[CTR_LOC]]
+// CHECK-NEXT: store i32 0, {{.*}} !dbg ![[CASE1_LOC:[0-9]+]]
+// CHECK-NEXT: br label {{.*}}, !dbg ![[CASE1_LOC]]
+
+// CHECK: [[CASE2_LBL]]:
+// CHECK-NEXT: %{{.*}} = load i64, ptr getelementptr inbounds ({{.*}}, ptr @__profc_main, {{.*}}), align {{.*}}, !dbg ![[CTR_LOC]]
+// CHECK-NEXT: %{{.*}} = add {{.*}}, !dbg ![[CTR_LOC]]
+// CHECK-NEXT: store i64 {{.*}}, ptr getelementptr inbounds ({{.*}}, ptr @__profc_main, {{.*}}), align {{.*}}, !dbg ![[CTR_LOC]]
+// CHECK-NEXT: store i32 1, {{.*}} !dbg ![[CASE2_LOC:[0-9]+]]
+// CHECK-NEXT: br label {{.*}}, !dbg ![[CASE2_LOC]]
+
+// CHECK: ![[SWITCH_LOC]] = !DILocation({{.*}}, scope: ![[MAIN_SCOPE]])
+// CHECK: ![[CTR_LOC]] = !DILocation(line: 0, scope: ![[BLOCK_SCOPE:[0-9]+]])
+// CHECK: ![[BLOCK_SCOPE]] = distinct !DILexicalBlock(scope: ![[MAIN_SCOPE]]
+// CHECK: ![[CASE1_LOC]] = !DILocation(line: {{.*}}, column: {{.*}}, scope: ![[BLOCK_SCOPE]])
+// CHECK: ![[CASE2_LOC]] = !DILocation(line: {{.*}}, column: {{.*}}, scope: ![[BLOCK_SCOPE]])
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