[AutoUpgrader] Make ArcRuntime Autoupgrader more conservative

Summary:
This is a tweak to r368311 and r368646 which auto upgrades the calls to
objc runtime functions to objc runtime intrinsics, in order to make sure
that the auto upgrader does not trigger with up-to-date bitcode.

It is possible for bitcode that is up-to-date to contain direct calls to
objc runtime function and those are not inserted by compiler as part of
ARC and they should not be upgraded. Now auto upgrader only triggers as
when the old style of ARC marker is used so it is guaranteed that it
won't trigger on update-to-date bitcode.

This also means it won't do this upgrade for bitcode from llvm-8 and
llvm-9, which preserves the behavior of those releases. Ideally they
should be upgraded as well but it is more important to make sure
AutoUpgrader will not trigger on up-to-date bitcode.

Reviewers: ahatanak, rjmccall, dexonsmith, pete

Reviewed By: dexonsmith

Subscribers: hiraditya, jkorous, llvm-commits

Tags: #llvm

Differential Revision: https://reviews.llvm.org/D66153

llvm-svn: 368730

2 files changed, 36 insertions, 34 deletions

diff --git a/llvm/test/Bitcode/upgrade-arc-runtime-calls-new.bc b/llvm/test/Bitcode/upgrade-arc-runtime-calls-new.bc
new file mode 100644
index 00000000000..68e350ab443
--- /dev/null
+++ b/llvm/test/Bitcode/upgrade-arc-runtime-calls-new.bc
diff --git a/llvm/test/Bitcode/upgrade-arc-runtime-calls.ll b/llvm/test/Bitcode/upgrade-arc-runtime-calls.ll
index dbccff2a5b0..d42c776ddc5 100644
--- a/llvm/test/Bitcode/upgrade-arc-runtime-calls.ll
+++ b/llvm/test/Bitcode/upgrade-arc-runtime-calls.ll
@@ -3,10 +3,12 @@
 
 ; upgrade-arc-runtime-calls.bc and upgrade-mrr-runtime-calls.bc are identical
 ; except that the former has the arm64 retainAutoreleasedReturnValueMarker
-; metadata.
+; metadata. upgrade-arc-runtime-calls-new.bc has the new module flag format of
+; marker, it should not be upgraded.
 
 ; RUN: llvm-dis < %S/upgrade-arc-runtime-calls.bc | FileCheck -check-prefixes=ARC %s
-; RUN: llvm-dis < %S/upgrade-mrr-runtime-calls.bc | FileCheck -check-prefixes=MRR %s
+; RUN: llvm-dis < %S/upgrade-mrr-runtime-calls.bc | FileCheck -check-prefixes=NOUPGRADE %s
+; RUN: llvm-dis < %S/upgrade-arc-runtime-calls-new.bc | FileCheck -check-prefixes=NOUPGRADE %s
 
 define void @testRuntimeCalls(i8* %a, i8** %b, i8** %c, i32* %d, i32** %e) personality i32 (...)* @__gxx_personality_v0 {
 entry:
@@ -89,35 +91,35 @@ unwindBlock:
 // ARC-NEXT: tail call void @llvm.objc.arc.annotation.bottomup.bbend(i8** %[[B]], i8** %[[C]])
 // ARC-NEXT: invoke void @objc_autoreleasePoolPop(i8* %[[A]])
 
-// MRR: define void @testRuntimeCalls(i8* %[[A:.*]], i8** %[[B:.*]], i8** %[[C:.*]], i32* %[[D:.*]], i32** %[[E:.*]]) personality
-// MRR: %[[V0:.*]] = tail call i8* @objc_autorelease(i8* %[[A]])
-// MRR-NEXT: tail call void @objc_autoreleasePoolPop(i8* %[[A]])
-// MRR-NEXT: %[[V1:.*]] = tail call i8* @objc_autoreleasePoolPush()
-// MRR-NEXT: %[[V2:.*]] = tail call i8* @objc_autoreleaseReturnValue(i8* %[[A]])
-// MRR-NEXT: tail call void @objc_copyWeak(i8** %[[B]], i8** %[[C]])
-// MRR-NEXT: tail call void @objc_destroyWeak(i8** %[[B]])
-// MRR-NEXT: %[[V3:.*]] = tail call i32* @objc_initWeak(i32** %[[E]], i32* %[[D]])
-// MRR-NEXT: %[[V4:.*]] = tail call i8* @objc_loadWeak(i8** %[[B]])
-// MRR-NEXT: %[[V5:.*]] = tail call i8* @objc_loadWeakRetained(i8** %[[B]])
-// MRR-NEXT: tail call void @objc_moveWeak(i8** %[[B]], i8** %[[C]])
-// MRR-NEXT: tail call void @objc_release(i8* %[[A]])
-// MRR-NEXT: %[[V6:.*]] = tail call i8* @objc_retain(i8* %[[A]])
-// MRR-NEXT: %[[V7:.*]] = tail call i8* @objc_retainAutorelease(i8* %[[A]])
-// MRR-NEXT: %[[V8:.*]] = tail call i8* @objc_retainAutoreleaseReturnValue(i8* %[[A]])
-// MRR-NEXT: %[[V9:.*]] = tail call i8* @objc_retainAutoreleasedReturnValue(i8* %[[A]])
-// MRR-NEXT: %[[V10:.*]] = tail call i8* @objc_retainBlock(i8* %[[A]])
-// MRR-NEXT: tail call void @objc_storeStrong(i8** %[[B]], i8* %[[A]])
-// MRR-NEXT: %[[V11:.*]] = tail call i8* @objc_storeWeak(i8** %[[B]], i8* %[[A]])
-// MRR-NEXT: tail call void (...) @llvm.objc.clang.arc.use(i8* %[[A]])
-// MRR-NEXT: %[[V12:.*]] = tail call i8* @objc_unsafeClaimAutoreleasedReturnValue(i8* %[[A]])
-// MRR-NEXT: %[[V13:.*]] = tail call i8* @objc_retainedObject(i8* %[[A]])
-// MRR-NEXT: %[[V14:.*]] = tail call i8* @objc_unretainedObject(i8* %[[A]])
-// MRR-NEXT: %[[V15:.*]] = tail call i8* @objc_unretainedPointer(i8* %[[A]])
-// MRR-NEXT: %[[V16:.*]] = tail call i8* @objc_retain.autorelease(i8* %[[A]])
-// MRR-NEXT: %[[V17:.*]] = tail call i32 @objc_sync.enter(i8* %[[A]])
-// MRR-NEXT: %[[V18:.*]] = tail call i32 @objc_sync.exit(i8* %[[A]])
-// MRR-NEXT: tail call void @objc_arc_annotation_topdown_bbstart(i8** %[[B]], i8** %[[C]])
-// MRR-NEXT: tail call void @objc_arc_annotation_topdown_bbend(i8** %[[B]], i8** %[[C]])
-// MRR-NEXT: tail call void @objc_arc_annotation_bottomup_bbstart(i8** %[[B]], i8** %[[C]])
-// MRR-NEXT: tail call void @objc_arc_annotation_bottomup_bbend(i8** %[[B]], i8** %[[C]])
-// MRR-NEXT: invoke void @objc_autoreleasePoolPop(i8* %[[A]])
+// NOUPGRADE: define void @testRuntimeCalls(i8* %[[A:.*]], i8** %[[B:.*]], i8** %[[C:.*]], i32* %[[D:.*]], i32** %[[E:.*]]) personality
+// NOUPGRADE: %[[V0:.*]] = tail call i8* @objc_autorelease(i8* %[[A]])
+// NOUPGRADE-NEXT: tail call void @objc_autoreleasePoolPop(i8* %[[A]])
+// NOUPGRADE-NEXT: %[[V1:.*]] = tail call i8* @objc_autoreleasePoolPush()
+// NOUPGRADE-NEXT: %[[V2:.*]] = tail call i8* @objc_autoreleaseReturnValue(i8* %[[A]])
+// NOUPGRADE-NEXT: tail call void @objc_copyWeak(i8** %[[B]], i8** %[[C]])
+// NOUPGRADE-NEXT: tail call void @objc_destroyWeak(i8** %[[B]])
+// NOUPGRADE-NEXT: %[[V3:.*]] = tail call i32* @objc_initWeak(i32** %[[E]], i32* %[[D]])
+// NOUPGRADE-NEXT: %[[V4:.*]] = tail call i8* @objc_loadWeak(i8** %[[B]])
+// NOUPGRADE-NEXT: %[[V5:.*]] = tail call i8* @objc_loadWeakRetained(i8** %[[B]])
+// NOUPGRADE-NEXT: tail call void @objc_moveWeak(i8** %[[B]], i8** %[[C]])
+// NOUPGRADE-NEXT: tail call void @objc_release(i8* %[[A]])
+// NOUPGRADE-NEXT: %[[V6:.*]] = tail call i8* @objc_retain(i8* %[[A]])
+// NOUPGRADE-NEXT: %[[V7:.*]] = tail call i8* @objc_retainAutorelease(i8* %[[A]])
+// NOUPGRADE-NEXT: %[[V8:.*]] = tail call i8* @objc_retainAutoreleaseReturnValue(i8* %[[A]])
+// NOUPGRADE-NEXT: %[[V9:.*]] = tail call i8* @objc_retainAutoreleasedReturnValue(i8* %[[A]])
+// NOUPGRADE-NEXT: %[[V10:.*]] = tail call i8* @objc_retainBlock(i8* %[[A]])
+// NOUPGRADE-NEXT: tail call void @objc_storeStrong(i8** %[[B]], i8* %[[A]])
+// NOUPGRADE-NEXT: %[[V11:.*]] = tail call i8* @objc_storeWeak(i8** %[[B]], i8* %[[A]])
+// NOUPGRADE-NEXT: tail call void (...) @llvm.objc.clang.arc.use(i8* %[[A]])
+// NOUPGRADE-NEXT: %[[V12:.*]] = tail call i8* @objc_unsafeClaimAutoreleasedReturnValue(i8* %[[A]])
+// NOUPGRADE-NEXT: %[[V13:.*]] = tail call i8* @objc_retainedObject(i8* %[[A]])
+// NOUPGRADE-NEXT: %[[V14:.*]] = tail call i8* @objc_unretainedObject(i8* %[[A]])
+// NOUPGRADE-NEXT: %[[V15:.*]] = tail call i8* @objc_unretainedPointer(i8* %[[A]])
+// NOUPGRADE-NEXT: %[[V16:.*]] = tail call i8* @objc_retain.autorelease(i8* %[[A]])
+// NOUPGRADE-NEXT: %[[V17:.*]] = tail call i32 @objc_sync.enter(i8* %[[A]])
+// NOUPGRADE-NEXT: %[[V18:.*]] = tail call i32 @objc_sync.exit(i8* %[[A]])
+// NOUPGRADE-NEXT: tail call void @objc_arc_annotation_topdown_bbstart(i8** %[[B]], i8** %[[C]])
+// NOUPGRADE-NEXT: tail call void @objc_arc_annotation_topdown_bbend(i8** %[[B]], i8** %[[C]])
+// NOUPGRADE-NEXT: tail call void @objc_arc_annotation_bottomup_bbstart(i8** %[[B]], i8** %[[C]])
+// NOUPGRADE-NEXT: tail call void @objc_arc_annotation_bottomup_bbend(i8** %[[B]], i8** %[[C]])
+// NOUPGRADE-NEXT: invoke void @objc_autoreleasePoolPop(i8* %[[A]])