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llvm-mirror/test/Transforms/ObjCARC/allocas.ll

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; RUN: opt -objc-arc -S < %s | FileCheck %s
declare i8* @objc_retain(i8*)
declare i8* @objc_retainAutoreleasedReturnValue(i8*)
declare void @objc_release(i8*)
declare i8* @objc_autorelease(i8*)
declare i8* @objc_autoreleaseReturnValue(i8*)
declare void @objc_autoreleasePoolPop(i8*)
declare i8* @objc_autoreleasePoolPush()
declare i8* @objc_retainBlock(i8*)
declare i8* @objc_retainedObject(i8*)
declare i8* @objc_unretainedObject(i8*)
declare i8* @objc_unretainedPointer(i8*)
declare void @use_pointer(i8*)
declare void @callee()
declare void @callee_fnptr(void ()*)
declare void @invokee()
declare i8* @returner()
declare i8* @returner1()
declare i8* @returner2()
declare void @bar(i32 ()*)
declare void @use_alloca(i8**)
declare void @llvm.dbg.value(metadata, i64, metadata)
declare i8* @objc_msgSend(i8*, i8*, ...)
; In the presense of allocas, unconditionally remove retain/release pairs only
; if they are known safe in both directions. This prevents matching up an inner
; retain with the boundary guarding release in the following situation:
;
; %A = alloca
; retain(%x)
; retain(%x) <--- Inner Retain
; store %x, %A
; %y = load %A
; ... DO STUFF ...
; release(%y)
; release(%x) <--- Guarding Release
;
; rdar://13750319
; CHECK: define void @test1a(i8* %x)
; CHECK: @objc_retain(i8* %x)
; CHECK: @objc_retain(i8* %x)
; CHECK: @objc_release(i8* %y)
; CHECK: @objc_release(i8* %x)
; CHECK: ret void
; CHECK: }
define void @test1a(i8* %x) {
entry:
%A = alloca i8*
tail call i8* @objc_retain(i8* %x)
tail call i8* @objc_retain(i8* %x)
store i8* %x, i8** %A, align 8
%y = load i8** %A
call void @use_alloca(i8** %A)
call void @objc_release(i8* %y), !clang.imprecise_release !0
call void @use_pointer(i8* %x)
call void @objc_release(i8* %x), !clang.imprecise_release !0
ret void
}
; CHECK: define void @test1b(i8* %x)
; CHECK: @objc_retain(i8* %x)
; CHECK: @objc_retain(i8* %x)
; CHECK: @objc_release(i8* %y)
; CHECK: @objc_release(i8* %x)
; CHECK: ret void
; CHECK: }
define void @test1b(i8* %x) {
entry:
%A = alloca i8*
%gep = getelementptr i8** %A, i32 0
tail call i8* @objc_retain(i8* %x)
tail call i8* @objc_retain(i8* %x)
store i8* %x, i8** %gep, align 8
%y = load i8** %A
call void @use_alloca(i8** %A)
call void @objc_release(i8* %y), !clang.imprecise_release !0
call void @use_pointer(i8* %x)
call void @objc_release(i8* %x), !clang.imprecise_release !0
ret void
}
; CHECK: define void @test1c(i8* %x)
; CHECK: @objc_retain(i8* %x)
; CHECK: @objc_retain(i8* %x)
; CHECK: @objc_release(i8* %y)
; CHECK: @objc_release(i8* %x)
; CHECK: ret void
; CHECK: }
define void @test1c(i8* %x) {
entry:
%A = alloca i8*, i32 3
%gep = getelementptr i8** %A, i32 2
tail call i8* @objc_retain(i8* %x)
tail call i8* @objc_retain(i8* %x)
store i8* %x, i8** %gep, align 8
%y = load i8** %gep
call void @use_alloca(i8** %A)
call void @objc_release(i8* %y), !clang.imprecise_release !0
call void @use_pointer(i8* %x)
call void @objc_release(i8* %x), !clang.imprecise_release !0
ret void
}
; CHECK: define void @test1d(i8* %x)
; CHECK: @objc_retain(i8* %x)
; CHECK: @objc_retain(i8* %x)
; CHECK: @objc_release(i8* %y)
; CHECK: @objc_release(i8* %x)
; CHECK: ret void
; CHECK: }
define void @test1d(i8* %x) {
entry:
br i1 undef, label %use_allocaA, label %use_allocaB
use_allocaA:
%allocaA = alloca i8*
br label %exit
use_allocaB:
%allocaB = alloca i8*
br label %exit
exit:
%A = phi i8** [ %allocaA, %use_allocaA ], [ %allocaB, %use_allocaB ]
%gep = getelementptr i8** %A, i32 0
tail call i8* @objc_retain(i8* %x)
tail call i8* @objc_retain(i8* %x)
store i8* %x, i8** %gep, align 8
%y = load i8** %gep
call void @use_alloca(i8** %A)
call void @objc_release(i8* %y), !clang.imprecise_release !0
call void @use_pointer(i8* %x)
call void @objc_release(i8* %x), !clang.imprecise_release !0
ret void
}
; CHECK: define void @test1e(i8* %x)
; CHECK: @objc_retain(i8* %x)
; CHECK: @objc_retain(i8* %x)
; CHECK: @objc_release(i8* %y)
; CHECK: @objc_release(i8* %x)
; CHECK: ret void
; CHECK: }
define void @test1e(i8* %x) {
entry:
br i1 undef, label %use_allocaA, label %use_allocaB
use_allocaA:
%allocaA = alloca i8*, i32 4
br label %exit
use_allocaB:
%allocaB = alloca i8*, i32 4
br label %exit
exit:
%A = phi i8** [ %allocaA, %use_allocaA ], [ %allocaB, %use_allocaB ]
%gep = getelementptr i8** %A, i32 2
tail call i8* @objc_retain(i8* %x)
tail call i8* @objc_retain(i8* %x)
store i8* %x, i8** %gep, align 8
%y = load i8** %gep
call void @use_alloca(i8** %A)
call void @objc_release(i8* %y), !clang.imprecise_release !0
call void @use_pointer(i8* %x)
call void @objc_release(i8* %x), !clang.imprecise_release !0
ret void
}
; CHECK: define void @test1f(i8* %x)
; CHECK: @objc_retain(i8* %x)
; CHECK: @objc_retain(i8* %x)
; CHECK: @objc_release(i8* %y)
; CHECK: @objc_release(i8* %x)
; CHECK: ret void
; CHECK: }
define void @test1f(i8* %x) {
entry:
%allocaOne = alloca i8*
%allocaTwo = alloca i8*
%A = select i1 undef, i8** %allocaOne, i8** %allocaTwo
tail call i8* @objc_retain(i8* %x)
tail call i8* @objc_retain(i8* %x)
store i8* %x, i8** %A, align 8
%y = load i8** %A
call void @use_alloca(i8** %A)
call void @objc_release(i8* %y), !clang.imprecise_release !0
call void @use_pointer(i8* %x)
call void @objc_release(i8* %x), !clang.imprecise_release !0
ret void
}
; Make sure that if a store is in a different basic block we handle known safe
; conservatively.
; CHECK: define void @test2a(i8* %x)
; CHECK: @objc_retain(i8* %x)
; CHECK: @objc_retain(i8* %x)
; CHECK: @objc_release(i8* %y)
; CHECK: @objc_release(i8* %x)
; CHECK: ret void
; CHECK: }
define void @test2a(i8* %x) {
entry:
%A = alloca i8*
store i8* %x, i8** %A, align 8
%y = load i8** %A
br label %bb1
bb1:
br label %bb2
bb2:
br label %bb3
bb3:
tail call i8* @objc_retain(i8* %x)
tail call i8* @objc_retain(i8* %x)
call void @use_alloca(i8** %A)
call void @objc_release(i8* %y), !clang.imprecise_release !0
call void @use_pointer(i8* %x)
call void @objc_release(i8* %x), !clang.imprecise_release !0
ret void
}
; CHECK: define void @test2b(i8* %x)
; CHECK: @objc_retain(i8* %x)
; CHECK: @objc_retain(i8* %x)
; CHECK: @objc_release(i8* %y)
; CHECK: @objc_release(i8* %x)
; CHECK: ret void
; CHECK: }
define void @test2b(i8* %x) {
entry:
%A = alloca i8*
%gep1 = getelementptr i8** %A, i32 0
store i8* %x, i8** %gep1, align 8
%gep2 = getelementptr i8** %A, i32 0
%y = load i8** %gep2
br label %bb1
bb1:
br label %bb2
bb2:
br label %bb3
bb3:
tail call i8* @objc_retain(i8* %x)
tail call i8* @objc_retain(i8* %x)
call void @use_alloca(i8** %A)
call void @objc_release(i8* %y), !clang.imprecise_release !0
call void @use_pointer(i8* %x)
call void @objc_release(i8* %x), !clang.imprecise_release !0
ret void
}
; CHECK: define void @test2c(i8* %x)
; CHECK: @objc_retain(i8* %x)
; CHECK: @objc_retain(i8* %x)
; CHECK: @objc_release(i8* %y)
; CHECK: @objc_release(i8* %x)
; CHECK: ret void
; CHECK: }
define void @test2c(i8* %x) {
entry:
%A = alloca i8*, i32 3
%gep1 = getelementptr i8** %A, i32 2
store i8* %x, i8** %gep1, align 8
%gep2 = getelementptr i8** %A, i32 2
%y = load i8** %gep2
tail call i8* @objc_retain(i8* %x)
br label %bb1
bb1:
br label %bb2
bb2:
br label %bb3
bb3:
tail call i8* @objc_retain(i8* %x)
call void @use_alloca(i8** %A)
call void @objc_release(i8* %y), !clang.imprecise_release !0
call void @use_pointer(i8* %x)
call void @objc_release(i8* %x), !clang.imprecise_release !0
ret void
}
; CHECK: define void @test2d(i8* %x)
; CHECK: @objc_retain(i8* %x)
; CHECK: @objc_retain(i8* %x)
; CHECK: @objc_release(i8* %y)
; CHECK: @objc_release(i8* %x)
; CHECK: ret void
; CHECK: }
define void @test2d(i8* %x) {
entry:
tail call i8* @objc_retain(i8* %x)
br label %bb1
bb1:
%Abb1 = alloca i8*, i32 3
%gepbb11 = getelementptr i8** %Abb1, i32 2
store i8* %x, i8** %gepbb11, align 8
%gepbb12 = getelementptr i8** %Abb1, i32 2
%ybb1 = load i8** %gepbb12
br label %bb3
bb2:
%Abb2 = alloca i8*, i32 4
%gepbb21 = getelementptr i8** %Abb2, i32 2
store i8* %x, i8** %gepbb21, align 8
%gepbb22 = getelementptr i8** %Abb2, i32 2
%ybb2 = load i8** %gepbb22
br label %bb3
bb3:
%A = phi i8** [ %Abb1, %bb1 ], [ %Abb2, %bb2 ]
%y = phi i8* [ %ybb1, %bb1 ], [ %ybb2, %bb2 ]
tail call i8* @objc_retain(i8* %x)
call void @use_alloca(i8** %A)
call void @objc_release(i8* %y), !clang.imprecise_release !0
call void @use_pointer(i8* %x)
call void @objc_release(i8* %x), !clang.imprecise_release !0
ret void
}
; Make sure in the presense of allocas, if we find a cfghazard we do not perform
; code motion even if we are known safe. These two concepts are separate and
; should be treated as such.
;
; rdar://13949644
; CHECK: define void @test3a() {
; CHECK: entry:
; CHECK: @objc_retainAutoreleasedReturnValue
; CHECK: @objc_retain
; CHECK: @objc_retain
; CHECK: @objc_retain
; CHECK: @objc_retain
; CHECK: arraydestroy.body:
; CHECK: @objc_release
; CHECK-NOT: @objc_release
; CHECK: arraydestroy.done:
; CHECK-NOT: @objc_release
; CHECK: arraydestroy.body1:
; CHECK: @objc_release
; CHECK-NOT: @objc_release
; CHECK: arraydestroy.done1:
; CHECK: @objc_release
; CHECK: ret void
; CHECK: }
define void @test3a() {
entry:
%keys = alloca [2 x i8*], align 16
%objs = alloca [2 x i8*], align 16
%call1 = call i8* @returner()
%tmp0 = tail call i8* @objc_retainAutoreleasedReturnValue(i8* %call1)
%objs.begin = getelementptr inbounds [2 x i8*]* %objs, i64 0, i64 0
tail call i8* @objc_retain(i8* %call1)
store i8* %call1, i8** %objs.begin, align 8
%objs.elt = getelementptr inbounds [2 x i8*]* %objs, i64 0, i64 1
tail call i8* @objc_retain(i8* %call1)
store i8* %call1, i8** %objs.elt
%call2 = call i8* @returner1()
%call3 = call i8* @returner2()
%keys.begin = getelementptr inbounds [2 x i8*]* %keys, i64 0, i64 0
tail call i8* @objc_retain(i8* %call2)
store i8* %call2, i8** %keys.begin, align 8
%keys.elt = getelementptr inbounds [2 x i8*]* %keys, i64 0, i64 1
tail call i8* @objc_retain(i8* %call3)
store i8* %call3, i8** %keys.elt
%gep = getelementptr inbounds [2 x i8*]* %objs, i64 0, i64 2
br label %arraydestroy.body
arraydestroy.body:
%arraydestroy.elementPast = phi i8** [ %gep, %entry ], [ %arraydestroy.element, %arraydestroy.body ]
%arraydestroy.element = getelementptr inbounds i8** %arraydestroy.elementPast, i64 -1
%destroy_tmp = load i8** %arraydestroy.element, align 8
call void @objc_release(i8* %destroy_tmp), !clang.imprecise_release !0
%objs_ptr = getelementptr inbounds [2 x i8*]* %objs, i64 0, i64 0
%arraydestroy.cmp = icmp eq i8** %arraydestroy.element, %objs_ptr
br i1 %arraydestroy.cmp, label %arraydestroy.done, label %arraydestroy.body
arraydestroy.done:
%gep1 = getelementptr inbounds [2 x i8*]* %keys, i64 0, i64 2
br label %arraydestroy.body1
arraydestroy.body1:
%arraydestroy.elementPast1 = phi i8** [ %gep1, %arraydestroy.done ], [ %arraydestroy.element1, %arraydestroy.body1 ]
%arraydestroy.element1 = getelementptr inbounds i8** %arraydestroy.elementPast1, i64 -1
%destroy_tmp1 = load i8** %arraydestroy.element1, align 8
call void @objc_release(i8* %destroy_tmp1), !clang.imprecise_release !0
%keys_ptr = getelementptr inbounds [2 x i8*]* %keys, i64 0, i64 0
%arraydestroy.cmp1 = icmp eq i8** %arraydestroy.element1, %keys_ptr
br i1 %arraydestroy.cmp1, label %arraydestroy.done1, label %arraydestroy.body1
arraydestroy.done1:
call void @objc_release(i8* %call1), !clang.imprecise_release !0
ret void
}
; Make sure that even though we stop said code motion we still allow for
; pointers to be removed if we are known safe in both directions.
;
; rdar://13949644
; CHECK: define void @test3b() {
; CHECK: entry:
; CHECK: @objc_retainAutoreleasedReturnValue
; CHECK: @objc_retain
; CHECK: @objc_retain
; CHECK: @objc_retain
; CHECK: @objc_retain
; CHECK: arraydestroy.body:
; CHECK: @objc_release
; CHECK-NOT: @objc_release
; CHECK: arraydestroy.done:
; CHECK-NOT: @objc_release
; CHECK: arraydestroy.body1:
; CHECK: @objc_release
; CHECK-NOT: @objc_release
; CHECK: arraydestroy.done1:
; CHECK: @objc_release
; CHECK: ret void
; CHECK: }
define void @test3b() {
entry:
%keys = alloca [2 x i8*], align 16
%objs = alloca [2 x i8*], align 16
%call1 = call i8* @returner()
%tmp0 = tail call i8* @objc_retainAutoreleasedReturnValue(i8* %call1)
%tmp1 = tail call i8* @objc_retain(i8* %call1)
%objs.begin = getelementptr inbounds [2 x i8*]* %objs, i64 0, i64 0
tail call i8* @objc_retain(i8* %call1)
store i8* %call1, i8** %objs.begin, align 8
%objs.elt = getelementptr inbounds [2 x i8*]* %objs, i64 0, i64 1
tail call i8* @objc_retain(i8* %call1)
store i8* %call1, i8** %objs.elt
%call2 = call i8* @returner1()
%call3 = call i8* @returner2()
%keys.begin = getelementptr inbounds [2 x i8*]* %keys, i64 0, i64 0
tail call i8* @objc_retain(i8* %call2)
store i8* %call2, i8** %keys.begin, align 8
%keys.elt = getelementptr inbounds [2 x i8*]* %keys, i64 0, i64 1
tail call i8* @objc_retain(i8* %call3)
store i8* %call3, i8** %keys.elt
%gep = getelementptr inbounds [2 x i8*]* %objs, i64 0, i64 2
br label %arraydestroy.body
arraydestroy.body:
%arraydestroy.elementPast = phi i8** [ %gep, %entry ], [ %arraydestroy.element, %arraydestroy.body ]
%arraydestroy.element = getelementptr inbounds i8** %arraydestroy.elementPast, i64 -1
%destroy_tmp = load i8** %arraydestroy.element, align 8
call void @objc_release(i8* %destroy_tmp), !clang.imprecise_release !0
%objs_ptr = getelementptr inbounds [2 x i8*]* %objs, i64 0, i64 0
%arraydestroy.cmp = icmp eq i8** %arraydestroy.element, %objs_ptr
br i1 %arraydestroy.cmp, label %arraydestroy.done, label %arraydestroy.body
arraydestroy.done:
%gep1 = getelementptr inbounds [2 x i8*]* %keys, i64 0, i64 2
br label %arraydestroy.body1
arraydestroy.body1:
%arraydestroy.elementPast1 = phi i8** [ %gep1, %arraydestroy.done ], [ %arraydestroy.element1, %arraydestroy.body1 ]
%arraydestroy.element1 = getelementptr inbounds i8** %arraydestroy.elementPast1, i64 -1
%destroy_tmp1 = load i8** %arraydestroy.element1, align 8
call void @objc_release(i8* %destroy_tmp1), !clang.imprecise_release !0
%keys_ptr = getelementptr inbounds [2 x i8*]* %keys, i64 0, i64 0
%arraydestroy.cmp1 = icmp eq i8** %arraydestroy.element1, %keys_ptr
br i1 %arraydestroy.cmp1, label %arraydestroy.done1, label %arraydestroy.body1
arraydestroy.done1:
call void @objc_release(i8* %call1), !clang.imprecise_release !0
call void @objc_release(i8* %call1), !clang.imprecise_release !0
ret void
}
!0 = metadata !{}
declare i32 @__gxx_personality_v0(...)