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llvm-6502/test/Transforms/ObjCARC/allocas.ll
Adrian Prantl 02474a32eb Move the complex address expression out of DIVariable and into an extra 
argument of the llvm.dbg.declare/llvm.dbg.value intrinsics.

Previously, DIVariable was a variable-length field that has an optional
reference to a Metadata array consisting of a variable number of
complex address expressions. In the case of OpPiece expressions this is
wasting a lot of storage in IR, because when an aggregate type is, e.g.,
SROA'd into all of its n individual members, the IR will contain n copies
of the DIVariable, all alike, only differing in the complex address
reference at the end.

By making the complex address into an extra argument of the
dbg.value/dbg.declare intrinsics, all of the pieces can reference the
same variable and the complex address expressions can be uniqued across
the CU, too.
Down the road, this will allow us to move other flags, such as
"indirection" out of the DIVariable, too.

The new intrinsics look like this:
declare void @llvm.dbg.declare(metadata %storage, metadata %var, metadata %expr)
declare void @llvm.dbg.value(metadata %storage, i64 %offset, metadata %var, metadata %expr)

This patch adds a new LLVM-local tag to DIExpressions, so we can detect
and pretty-print DIExpression metadata nodes.

What this patch doesn't do:

This patch does not touch the "Indirect" field in DIVariable; but moving
that into the expression would be a natural next step.

http://reviews.llvm.org/D4919
rdar://problem/17994491

Thanks to dblaikie and dexonsmith for reviewing this patch!

Note: I accidentally committed a bogus older version of this patch previously.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@218787 91177308-0d34-0410-b5e6-96231b3b80d8
2014-10-01 18:55:02 +00:00

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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, metadata)
declare i8* @objc_msgSend(i8*, i8*, ...)
; In the presence 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 presence 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(...)
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