Avoid Assertion Failure Using -fcs-profile-generate with distributed thin-lto (#129736)

When using `-fcs-generate-profile` with distributed thin-lto in the same
fashion we do for local thin-lto, we hit the following assertion:


https://github.com/llvm/llvm-project/blob/6041c745f32e8fd60ed24e29e7d919d8d1c87ca6/llvm/lib/Support/PGOOptions.cpp#L36

Using local thin-lto with LLD for MachO, we set the missing path
automatically to a default value: https://reviews.llvm.org/D151589. In
this fix we add the same behavior.

---------

Co-authored-by: Nuri Amari <[email protected]>

Author: NuriAmari

clang/lib/CodeGen/BackendUtil.cpp

@@ -1352,7 +1352,7 @@ runThinLTOBackend(CompilerInstance &CI, ModuleSummaryIndex *CombinedIndex,
   // Context sensitive profile.
   if (CGOpts.hasProfileCSIRInstr()) {
     Conf.RunCSIRInstr = true;
-    Conf.CSIRProfile = std::move(CGOpts.InstrProfileOutput);
+    Conf.CSIRProfile = getProfileGenName(CGOpts);
   } else if (CGOpts.hasProfileCSIRUse()) {
     Conf.RunCSIRInstr = false;
     Conf.CSIRProfile = std::move(CGOpts.ProfileInstrumentUsePath);

clang/test/CodeGen/thinlto-distributed-backend-skip.ll renamed to clang/test/CodeGen/distributed-thin-lto/backend-skip.ll

@@ -6,7 +6,7 @@
 ; RUN: opt -thinlto-bc -o %t.o %s
 
 ; RUN: %clang_cc1 -triple x86_64-grtev4-linux-gnu \
-; RUN:   -fthinlto-index=%S/Inputs/thinlto-distributed-backend-skip.bc \
+; RUN:   -fthinlto-index=%S/../Inputs/thinlto-distributed-backend-skip.bc \
 ; RUN:   -emit-llvm -o - -x ir %t.o | FileCheck %s
 
 target datalayout = "e-m:e-p270:32:32-p271:32:32-p272:64:64-i64:64-f80:128-n8:16:32:64-S128"

clang/test/CodeGen/thinlto-distributed.ll renamed to clang/test/CodeGen/distributed-thin-lto/basic.ll

@@ -33,7 +33,7 @@
 ; RUN: llvm-dis %t.o.thinlto.bc -o - | FileCheck %s --check-prefix=CHECK-DIS
 ; Round trip it through llvm-as
 ; RUN: llvm-dis %t.o.thinlto.bc -o - | llvm-as -o - | llvm-dis -o - | FileCheck %s --check-prefix=CHECK-DIS
-; CHECK-DIS: ^0 = module: (path: "{{.*}}thinlto-distributed-cfi-devirt.ll.tmp.o", hash: ({{.*}}, {{.*}}, {{.*}}, {{.*}}, {{.*}}))
+; CHECK-DIS: ^0 = module: (path: "{{.*}}cfi-devirt.ll.tmp.o", hash: ({{.*}}, {{.*}}, {{.*}}, {{.*}}, {{.*}}))
 ; CHECK-DIS: ^1 = gv: (guid: 8346051122425466633, summaries: (function: (module: ^0, flags: (linkage: external, visibility: default, notEligibleToImport: 0, live: 1, dsoLocal: 0, canAutoHide: 0, importType: definition), insts: 18, funcFlags: (readNone: 0, readOnly: 0, noRecurse: 0, returnDoesNotAlias: 0, noInline: 0, alwaysInline: 0, noUnwind: 0, mayThrow: 0, hasUnknownCall: 1, mustBeUnreachable: 0), typeIdInfo: (typeTests: (^2), typeCheckedLoadVCalls: (vFuncId: (^2, offset: 8), vFuncId: (^2, offset: 0))))))
 ; CHECK-DIS: ^2 = typeid: (name: "_ZTS1A", summary: (typeTestRes: (kind: allOnes, sizeM1BitWidth: 7), wpdResolutions: ((offset: 0, wpdRes: (kind: branchFunnel)), (offset: 8, wpdRes: (kind: singleImpl, singleImplName: "_ZN1A1nEi"))))) ; guid = 7004155349499253778
 

clang/test/CodeGen/thinlto-distributed-cfi-devirt.ll renamed to clang/test/CodeGen/distributed-thin-lto/cfi-devirt.ll

@@ -23,7 +23,7 @@
 ; RUN: llvm-dis %t.o.thinlto.bc -o - | FileCheck %s --check-prefix=CHECK-DIS
 ; Round trip it through llvm-as
 ; RUN: llvm-dis %t.o.thinlto.bc -o - | llvm-as -o - | llvm-dis -o - | FileCheck %s --check-prefix=CHECK-DIS
-; CHECK-DIS: ^0 = module: (path: "{{.*}}thinlto-distributed-cfi.ll.tmp.o", hash: ({{.*}}, {{.*}}, {{.*}}, {{.*}}, {{.*}}))
+; CHECK-DIS: ^0 = module: (path: "{{.*}}cfi.ll.tmp.o", hash: ({{.*}}, {{.*}}, {{.*}}, {{.*}}, {{.*}}))
 ; CHECK-DIS: ^1 = gv: (guid: 8346051122425466633, summaries: (function: (module: ^0, flags: (linkage: external, visibility: default, notEligibleToImport: 0, live: 1, dsoLocal: 0, canAutoHide: 0, importType: definition), insts: 7, funcFlags: (readNone: 0, readOnly: 0, noRecurse: 1, returnDoesNotAlias: 0, noInline: 0, alwaysInline: 0, noUnwind: 1, mayThrow: 0, hasUnknownCall: 0, mustBeUnreachable: 0), typeIdInfo: (typeTests: (^2)))))
 ; CHECK-DIS: ^2 = typeid: (name: "_ZTS1A", summary: (typeTestRes: (kind: single, sizeM1BitWidth: 0))) ; guid = 7004155349499253778
 

clang/test/CodeGen/thinlto-distributed-cfi.ll renamed to clang/test/CodeGen/distributed-thin-lto/cfi.ll

@@ -0,0 +1,8 @@
+// RUN: mkdir -p %t
+// RUN: %clang -target x86_64-apple-darwin -fcs-profile-generate -flto=thin -c -o %t/main.bc %s
+// RUN: llvm-lto2 run --thinlto-distributed-indexes %t/main.bc -o %t/index -r=%t/main.bc,_main,px
+// RUN: %clang -target x86_64-apple-darwin -fcs-profile-generate -c -o %t/main.o -fthinlto-index=%t/main.bc.thinlto.bc %t/main.bc
+
+int main() {
+    return 0;
+}