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Consider ObjC runtime calls objc_storeWeak and others which make a copy of
their argument as "escape" points for objc_retainBlock optimization. This fixes rdar://11229925. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@154682 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Dan Gohman
parent
064551e94c
commit
4423477548
@ -162,6 +162,7 @@ namespace {
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IC_MoveWeak, ///< objc_moveWeak (derived)
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IC_CopyWeak, ///< objc_copyWeak (derived)
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IC_DestroyWeak, ///< objc_destroyWeak (derived)
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IC_StoreStrong, ///< objc_storeStrong (derived)
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IC_CallOrUser, ///< could call objc_release and/or "use" pointers
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IC_Call, ///< could call objc_release
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IC_User, ///< could "use" a pointer
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@ -262,6 +263,7 @@ static InstructionClass GetFunctionClass(const Function *F) {
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return StringSwitch<InstructionClass>(F->getName())
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.Case("objc_storeWeak", IC_StoreWeak)
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.Case("objc_initWeak", IC_InitWeak)
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.Case("objc_storeStrong", IC_StoreStrong)
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.Default(IC_CallOrUser);
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// Second argument is i8**.
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if (PointerType *Pte1 = dyn_cast<PointerType>(ETy1))
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@ -618,22 +620,35 @@ static bool DoesObjCBlockEscape(const Value *BlockPtr) {
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const User *UUser = *UI;
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// Special - Use by a call (callee or argument) is not considered
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// to be an escape.
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if (isa<CallInst>(UUser) || isa<InvokeInst>(UUser))
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continue;
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// Use by an instruction which copies the value is an escape if the
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// result is an escape.
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if (isa<BitCastInst>(UUser) || isa<GetElementPtrInst>(UUser) ||
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isa<PHINode>(UUser) || isa<SelectInst>(UUser)) {
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Worklist.push_back(UUser);
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switch (GetBasicInstructionClass(UUser)) {
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case IC_StoreWeak:
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case IC_InitWeak:
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case IC_StoreStrong:
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case IC_Autorelease:
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case IC_AutoreleaseRV:
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// These special functions make copies of their pointer arguments.
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return true;
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case IC_User:
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case IC_None:
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// Use by an instruction which copies the value is an escape if the
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// result is an escape.
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if (isa<BitCastInst>(UUser) || isa<GetElementPtrInst>(UUser) ||
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isa<PHINode>(UUser) || isa<SelectInst>(UUser)) {
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Worklist.push_back(UUser);
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continue;
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}
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// Use by a load is not an escape.
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if (isa<LoadInst>(UUser))
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continue;
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// Use by a store is not an escape if the use is the address.
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if (const StoreInst *SI = dyn_cast<StoreInst>(UUser))
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if (V != SI->getValueOperand())
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continue;
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break;
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default:
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// Regular calls and other stuff are not considered escapes.
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continue;
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}
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// Use by a load is not an escape.
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if (isa<LoadInst>(UUser))
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continue;
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// Use by a store is not an escape if the use is the address.
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if (const StoreInst *SI = dyn_cast<StoreInst>(UUser))
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if (V != SI->getValueOperand())
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continue;
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// Otherwise, conservatively assume an escape.
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return true;
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}
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131
test/Transforms/ObjCARC/escape.ll
Normal file
131
test/Transforms/ObjCARC/escape.ll
Normal file
@ -0,0 +1,131 @@
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; RUN: opt -objc-arc -S < %s | FileCheck %s
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; rdar://11229925
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target datalayout = "e-p:64:64:64-i1:8:8-i8:8:8-i16:16:16-i32:32:32-i64:64:64-f32:32:32-f64:64:64-v64:64:64-v128:128:128-a0:0:64-s0:64:64-f80:128:128-n8:16:32:64-S128"
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%struct.__block_byref_weakLogNTimes = type { i8*, %struct.__block_byref_weakLogNTimes*, i32, i32, i8*, i8*, void (...)* }
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%struct.__block_descriptor = type { i64, i64 }
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; Don't optimize away the retainBlock, because the object's address "escapes"
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; with the objc_storeWeak call.
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; CHECK: define void @test0(
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; CHECK: %tmp7 = call i8* @objc_retainBlock(i8* %tmp6) nounwind, !clang.arc.copy_on_escape !0
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; CHECK: call void @objc_release(i8* %tmp7) nounwind, !clang.imprecise_release !0
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; CHECK: }
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define void @test0() nounwind {
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entry:
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%weakLogNTimes = alloca %struct.__block_byref_weakLogNTimes, align 8
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%block = alloca <{ i8*, i32, i32, i8*, %struct.__block_descriptor*, i8* }>, align 8
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%byref.isa = getelementptr inbounds %struct.__block_byref_weakLogNTimes* %weakLogNTimes, i64 0, i32 0
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store i8* null, i8** %byref.isa, align 8
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%byref.forwarding = getelementptr inbounds %struct.__block_byref_weakLogNTimes* %weakLogNTimes, i64 0, i32 1
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store %struct.__block_byref_weakLogNTimes* %weakLogNTimes, %struct.__block_byref_weakLogNTimes** %byref.forwarding, align 8
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%byref.flags = getelementptr inbounds %struct.__block_byref_weakLogNTimes* %weakLogNTimes, i64 0, i32 2
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store i32 33554432, i32* %byref.flags, align 8
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%byref.size = getelementptr inbounds %struct.__block_byref_weakLogNTimes* %weakLogNTimes, i64 0, i32 3
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store i32 48, i32* %byref.size, align 4
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%tmp1 = getelementptr inbounds %struct.__block_byref_weakLogNTimes* %weakLogNTimes, i64 0, i32 4
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store i8* bitcast (void (i8*, i8*)* @__Block_byref_object_copy_ to i8*), i8** %tmp1, align 8
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%tmp2 = getelementptr inbounds %struct.__block_byref_weakLogNTimes* %weakLogNTimes, i64 0, i32 5
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store i8* bitcast (void (i8*)* @__Block_byref_object_dispose_ to i8*), i8** %tmp2, align 8
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%weakLogNTimes1 = getelementptr inbounds %struct.__block_byref_weakLogNTimes* %weakLogNTimes, i64 0, i32 6
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%tmp3 = bitcast void (...)** %weakLogNTimes1 to i8**
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%tmp4 = call i8* @objc_initWeak(i8** %tmp3, i8* null) nounwind
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%block.isa = getelementptr inbounds <{ i8*, i32, i32, i8*, %struct.__block_descriptor*, i8* }>* %block, i64 0, i32 0
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store i8* null, i8** %block.isa, align 8
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%block.flags = getelementptr inbounds <{ i8*, i32, i32, i8*, %struct.__block_descriptor*, i8* }>* %block, i64 0, i32 1
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store i32 1107296256, i32* %block.flags, align 8
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%block.reserved = getelementptr inbounds <{ i8*, i32, i32, i8*, %struct.__block_descriptor*, i8* }>* %block, i64 0, i32 2
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store i32 0, i32* %block.reserved, align 4
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%block.invoke = getelementptr inbounds <{ i8*, i32, i32, i8*, %struct.__block_descriptor*, i8* }>* %block, i64 0, i32 3
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store i8* bitcast (void (i8*, i32)* @__main_block_invoke_0 to i8*), i8** %block.invoke, align 8
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%block.descriptor = getelementptr inbounds <{ i8*, i32, i32, i8*, %struct.__block_descriptor*, i8* }>* %block, i64 0, i32 4
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store %struct.__block_descriptor* null, %struct.__block_descriptor** %block.descriptor, align 8
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%block.captured = getelementptr inbounds <{ i8*, i32, i32, i8*, %struct.__block_descriptor*, i8* }>* %block, i64 0, i32 5
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%tmp5 = bitcast %struct.__block_byref_weakLogNTimes* %weakLogNTimes to i8*
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store i8* %tmp5, i8** %block.captured, align 8
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%tmp6 = bitcast <{ i8*, i32, i32, i8*, %struct.__block_descriptor*, i8* }>* %block to i8*
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%tmp7 = call i8* @objc_retainBlock(i8* %tmp6) nounwind, !clang.arc.copy_on_escape !0
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%tmp8 = load %struct.__block_byref_weakLogNTimes** %byref.forwarding, align 8
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%weakLogNTimes3 = getelementptr inbounds %struct.__block_byref_weakLogNTimes* %tmp8, i64 0, i32 6
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%tmp9 = bitcast void (...)** %weakLogNTimes3 to i8**
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%tmp10 = call i8* @objc_storeWeak(i8** %tmp9, i8* %tmp7) nounwind
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%tmp11 = getelementptr inbounds i8* %tmp7, i64 16
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%tmp12 = bitcast i8* %tmp11 to i8**
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%tmp13 = load i8** %tmp12, align 8
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%tmp14 = bitcast i8* %tmp13 to void (i8*, i32)*
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call void %tmp14(i8* %tmp7, i32 10) nounwind, !clang.arc.no_objc_arc_exceptions !0
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call void @objc_release(i8* %tmp7) nounwind, !clang.imprecise_release !0
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call void @_Block_object_dispose(i8* %tmp5, i32 8) nounwind
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call void @objc_destroyWeak(i8** %tmp3) nounwind
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ret void
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}
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; Like test0, but it makes a regular call instead of a storeWeak call,
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; so the optimization is valid.
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; CHECK: define void @test1(
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; CHECK-NOT: @objc_retainBlock
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; CHECK: }
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define void @test1() nounwind {
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entry:
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%weakLogNTimes = alloca %struct.__block_byref_weakLogNTimes, align 8
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%block = alloca <{ i8*, i32, i32, i8*, %struct.__block_descriptor*, i8* }>, align 8
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%byref.isa = getelementptr inbounds %struct.__block_byref_weakLogNTimes* %weakLogNTimes, i64 0, i32 0
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store i8* null, i8** %byref.isa, align 8
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%byref.forwarding = getelementptr inbounds %struct.__block_byref_weakLogNTimes* %weakLogNTimes, i64 0, i32 1
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store %struct.__block_byref_weakLogNTimes* %weakLogNTimes, %struct.__block_byref_weakLogNTimes** %byref.forwarding, align 8
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%byref.flags = getelementptr inbounds %struct.__block_byref_weakLogNTimes* %weakLogNTimes, i64 0, i32 2
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store i32 33554432, i32* %byref.flags, align 8
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%byref.size = getelementptr inbounds %struct.__block_byref_weakLogNTimes* %weakLogNTimes, i64 0, i32 3
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store i32 48, i32* %byref.size, align 4
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%tmp1 = getelementptr inbounds %struct.__block_byref_weakLogNTimes* %weakLogNTimes, i64 0, i32 4
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store i8* bitcast (void (i8*, i8*)* @__Block_byref_object_copy_ to i8*), i8** %tmp1, align 8
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%tmp2 = getelementptr inbounds %struct.__block_byref_weakLogNTimes* %weakLogNTimes, i64 0, i32 5
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store i8* bitcast (void (i8*)* @__Block_byref_object_dispose_ to i8*), i8** %tmp2, align 8
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%weakLogNTimes1 = getelementptr inbounds %struct.__block_byref_weakLogNTimes* %weakLogNTimes, i64 0, i32 6
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%tmp3 = bitcast void (...)** %weakLogNTimes1 to i8**
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%tmp4 = call i8* @objc_initWeak(i8** %tmp3, i8* null) nounwind
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%block.isa = getelementptr inbounds <{ i8*, i32, i32, i8*, %struct.__block_descriptor*, i8* }>* %block, i64 0, i32 0
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store i8* null, i8** %block.isa, align 8
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%block.flags = getelementptr inbounds <{ i8*, i32, i32, i8*, %struct.__block_descriptor*, i8* }>* %block, i64 0, i32 1
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store i32 1107296256, i32* %block.flags, align 8
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%block.reserved = getelementptr inbounds <{ i8*, i32, i32, i8*, %struct.__block_descriptor*, i8* }>* %block, i64 0, i32 2
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store i32 0, i32* %block.reserved, align 4
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%block.invoke = getelementptr inbounds <{ i8*, i32, i32, i8*, %struct.__block_descriptor*, i8* }>* %block, i64 0, i32 3
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store i8* bitcast (void (i8*, i32)* @__main_block_invoke_0 to i8*), i8** %block.invoke, align 8
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%block.descriptor = getelementptr inbounds <{ i8*, i32, i32, i8*, %struct.__block_descriptor*, i8* }>* %block, i64 0, i32 4
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store %struct.__block_descriptor* null, %struct.__block_descriptor** %block.descriptor, align 8
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%block.captured = getelementptr inbounds <{ i8*, i32, i32, i8*, %struct.__block_descriptor*, i8* }>* %block, i64 0, i32 5
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%tmp5 = bitcast %struct.__block_byref_weakLogNTimes* %weakLogNTimes to i8*
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store i8* %tmp5, i8** %block.captured, align 8
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%tmp6 = bitcast <{ i8*, i32, i32, i8*, %struct.__block_descriptor*, i8* }>* %block to i8*
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%tmp7 = call i8* @objc_retainBlock(i8* %tmp6) nounwind, !clang.arc.copy_on_escape !0
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%tmp8 = load %struct.__block_byref_weakLogNTimes** %byref.forwarding, align 8
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%weakLogNTimes3 = getelementptr inbounds %struct.__block_byref_weakLogNTimes* %tmp8, i64 0, i32 6
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%tmp9 = bitcast void (...)** %weakLogNTimes3 to i8**
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%tmp10 = call i8* @not_really_objc_storeWeak(i8** %tmp9, i8* %tmp7) nounwind
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%tmp11 = getelementptr inbounds i8* %tmp7, i64 16
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%tmp12 = bitcast i8* %tmp11 to i8**
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%tmp13 = load i8** %tmp12, align 8
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%tmp14 = bitcast i8* %tmp13 to void (i8*, i32)*
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call void %tmp14(i8* %tmp7, i32 10) nounwind, !clang.arc.no_objc_arc_exceptions !0
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call void @objc_release(i8* %tmp7) nounwind, !clang.imprecise_release !0
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call void @_Block_object_dispose(i8* %tmp5, i32 8) nounwind
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call void @objc_destroyWeak(i8** %tmp3) nounwind
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ret void
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}
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declare void @__Block_byref_object_copy_(i8*, i8*) nounwind
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declare void @__Block_byref_object_dispose_(i8*) nounwind
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declare void @objc_destroyWeak(i8**)
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declare i8* @objc_initWeak(i8**, i8*)
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declare void @__main_block_invoke_0(i8* nocapture, i32) nounwind ssp
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declare void @_Block_object_dispose(i8*, i32)
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declare i8* @objc_retainBlock(i8*)
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declare i8* @objc_storeWeak(i8**, i8*)
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declare i8* @not_really_objc_storeWeak(i8**, i8*)
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declare void @objc_release(i8*)
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!0 = metadata !{}
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