[PATCH] D110422: [AIX] Change the linkage of profiling counter/data to be private

[Jinsong Ji via Phabricator via cfe-commits]

jsji updated this revision to Diff 375709.
jsji added a comment.

Split the Driver changes to another patch, also fixed the duplicate code.


Repository:
  rG LLVM Github Monorepo

CHANGES SINCE LAST ACTION
  https://reviews.llvm.org/D110422/new/

https://reviews.llvm.org/D110422

Files:
  clang/test/Profile/cxx-templates.cpp
  llvm/lib/Transforms/Instrumentation/InstrProfiling.cpp
  llvm/test/Instrumentation/InstrProfiling/profiling.ll


Index: llvm/test/Instrumentation/InstrProfiling/profiling.ll
===================================================================
--- llvm/test/Instrumentation/InstrProfiling/profiling.ll
+++ llvm/test/Instrumentation/InstrProfiling/profiling.ll
@@ -45,8 +45,8 @@
 ; MACHO: @__profd_foo_weak = weak hidden global
 ; COFF: @__profc_foo_weak = weak hidden global
 ; COFF: @__profd_foo_weak = private global
-; XCOFF: @__profc_foo_weak = weak hidden global
-; XCOFF: @__profd_foo_weak = weak hidden global
+; XCOFF: @__profc_foo_weak = private global
+; XCOFF: @__profd_foo_weak = private global
 define weak void @foo_weak() {
   call void @llvm.instrprof.increment(i8* getelementptr inbounds ([8 x i8], [8 x i8]* @__profn_foo_weak, i32 0, i32 0), i64 0, i32 1, i32 0)
   ret void
@@ -71,8 +71,8 @@
 ; MACHO: @__profd_foo_inline = linkonce_odr hidden global
 ; COFF: @__profc_foo_inline = linkonce_odr hidden global{{.*}} section ".lprfc$M", align 8
 ; COFF: @__profd_foo_inline = private global{{.*}} section ".lprfd$M", align 8
-; XCOFF: @__profc_foo_inline = linkonce_odr hidden global
-; XCOFF: @__profd_foo_inline = linkonce_odr hidden global
+; XCOFF: @__profc_foo_inline = private global
+; XCOFF: @__profd_foo_inline = private global
 define linkonce_odr void @foo_inline() {
   call void @llvm.instrprof.increment(i8* getelementptr inbounds ([10 x i8], [10 x i8]* @__profn_foo_inline, i32 0, i32 0), i64 0, i32 1, i32 0)
   ret void
@@ -84,8 +84,8 @@
 ; MACHO: @__profd_foo_extern = linkonce_odr hidden global
 ; COFF: @__profc_foo_extern = linkonce_odr hidden global {{.*}}section ".lprfc$M", comdat, align 8
 ; COFF: @__profd_foo_extern = private global {{.*}}section ".lprfd$M", comdat($__profc_foo_extern), align 8
-; XCOFF: @__profc_foo_extern = linkonce_odr hidden global
-; XCOFF: @__profd_foo_extern = linkonce_odr hidden global
+; XCOFF: @__profc_foo_extern = private global
+; XCOFF: @__profd_foo_extern = private global
 define available_externally void @foo_extern() {
   call void @llvm.instrprof.increment(i8* getelementptr inbounds ([10 x i8], [10 x i8]* @__profn_foo_extern, i32 0, i32 0), i64 0, i32 1, i32 0)
   ret void
Index: llvm/lib/Transforms/Instrumentation/InstrProfiling.cpp
===================================================================
--- llvm/lib/Transforms/Instrumentation/InstrProfiling.cpp
+++ llvm/lib/Transforms/Instrumentation/InstrProfiling.cpp
@@ -862,6 +862,15 @@
   GlobalValue::LinkageTypes Linkage = NamePtr->getLinkage();
   GlobalValue::VisibilityTypes Visibility = NamePtr->getVisibility();
 
+  // Due to the limitation of binder as of 2021/09/28, the duplicate weak
+  // symbols in the same csect won't be discarded. When there are duplicate weak
+  // symbols, we can NOT guarantee that the relocations get resolved to the
+  // intended weak symbol, so we can not ensure the correctness of the relative
+  // CounterPtr, so we have to use private linkage for counter and data symbols.
+  if (TT.isOSBinFormatXCOFF()) {
+    Linkage = GlobalValue::PrivateLinkage;
+    Visibility = GlobalValue::DefaultVisibility;
+  }
   // Move the name variable to the right section. Place them in a COMDAT group
   // if the associated function is a COMDAT. This will make sure that only one
   // copy of counters of the COMDAT function will be emitted after linking. Keep
@@ -971,6 +980,7 @@
     Linkage = GlobalValue::PrivateLinkage;
     Visibility = GlobalValue::DefaultVisibility;
   }
+
   auto *Data =
       new GlobalVariable(*M, DataTy, false, Linkage, nullptr, DataVarName);
   // Reference the counter variable with a label difference (link-time
Index: clang/test/Profile/cxx-templates.cpp
===================================================================
--- clang/test/Profile/cxx-templates.cpp
+++ clang/test/Profile/cxx-templates.cpp
@@ -10,8 +10,10 @@
 // RUN: FileCheck --input-file=%tuse -check-prefix=T0USE -check-prefix=ALL %s
 // RUN: FileCheck --input-file=%tuse -check-prefix=T100USE -check-prefix=ALL %s
 
-// T0GEN: @[[T0C:__profc__Z4loopILj0EEvv]] = linkonce_odr {{(hidden|dso_local)}} global [2 x i64] zeroinitializer
-// T100GEN: @[[T100C:__profc__Z4loopILj100EEvv]] = linkonce_odr {{(hidden|dso_local)}} global [2 x i64] zeroinitializer
+// The linkage can be target dependent, so accept all linkage here,
+// the linkage tests for different target are in llvm/test/Instrumentation/InstrProfiling/profiling.ll
+// T0GEN: @[[T0C:__profc__Z4loopILj0EEvv]] = {{.*}} global [2 x i64] zeroinitializer
+// T100GEN: @[[T100C:__profc__Z4loopILj100EEvv]] = {{.*}} global [2 x i64] zeroinitializer
 
 // T0GEN-LABEL: define linkonce_odr {{.*}}void @_Z4loopILj0EEvv()
 // T0USE-LABEL: define linkonce_odr {{.*}}void @_Z4loopILj0EEvv()


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