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llvm-project/llvm/test/Analysis/StackSafetyAnalysis/lifetime.ll
Nikita Popov 92c55a315e
[IR] Only allow lifetime.start/end on allocas (#149310) 
lifetime.start and lifetime.end are primarily intended for use on
allocas, to enable stack coloring and other liveness optimizations. This
is necessary because all (static) allocas are hoisted into the entry
block, so lifetime markers are the only way to convey the actual
lifetimes.

However, lifetime.start and lifetime.end are currently *allowed* to be
used on non-alloca pointers. We don't actually do this in practice, but
just the mere fact that this is possible breaks the core purpose of the
lifetime markers, which is stack coloring of allocas. Stack coloring can
only work correctly if all lifetime markers for an alloca are
analyzable.

* If a lifetime marker may operate on multiple allocas via a select/phi,
we don't know which lifetime actually starts/ends and handle it
incorrectly (https://github.com/llvm/llvm-project/issues/104776).
* Stack coloring operates on the assumption that all lifetime markers
are visible, and not, for example, hidden behind a function call or
escaped pointer. It's not possible to change this, as part of the
purpose of lifetime markers is that they work even in the presence of
escaped pointers, where simple use analysis is insufficient.

I don't think there is any way to have coherent semantics for lifetime
markers on allocas, while also permitting them on arbitrary pointer
values.

This PR restricts lifetimes to operate on allocas only. As a followup, I
will also drop the size argument, which is superfluous if we always
operate on an alloca. (This change also renders various code handling
lifetime markers on non-alloca dead. I plan to clean up that kind of
code after dropping the size argument as well.)

In practice, I've only found a few places that currently produce
lifetimes on non-allocas:

* CoroEarly replaces the promise alloca with the result of an intrinsic,
which will later be replaced back with an alloca. I think this is the
only place where there is some legitimate loss of functionality, but I
don't think this is particularly important (I don't think we'd expect
the promise in a coroutine to admit useful lifetime optimization.)
* SafeStack moves unsafe allocas onto a separate frame. We can safely
drop lifetimes here, as SafeStack performs its own stack coloring.
* Similar for AddressSanitizer, it also moves allocas into separate
memory.
* LSR sometimes replaces the lifetime argument with a GEP chain of the
alloca (where the offsets ultimately cancel out). This is just
unnecessary. (Fixed separately in
https://github.com/llvm/llvm-project/pull/149492.)
* InferAddrSpaces sometimes makes lifetimes operate on an addrspacecast
of an alloca. I don't think this is necessary.
2025-07-21 15:04:50 +02:00

979 lines
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; RUN: opt -passes='print<stack-lifetime><may>' -disable-output %s 2>&1 | FileCheck %s --check-prefixes=CHECK,MAY
; RUN: opt -passes='print<stack-lifetime><must>' -disable-output %s 2>&1 | FileCheck %s --check-prefixes=CHECK,MUST
define void @f() {
; CHECK-LABEL: define void @f()
entry:
; CHECK: entry:
; CHECK-NEXT: Alive: <>
%x = alloca i32, align 4
%y = alloca i32, align 4
; CHECK: %y = alloca i32, align 4
; CHECK-NEXT: Alive: <>
%z = alloca i32, align 4
call void @llvm.lifetime.start.p0(i64 -1, ptr %z)
; CHECK: call void @llvm.lifetime.start.p0(i64 -1, ptr %z)
; CHECK-NEXT: Alive: <z>
call void @llvm.lifetime.start.p0(i64 -1, ptr %x)
; CHECK: call void @llvm.lifetime.start.p0(i64 -1, ptr %x)
; CHECK-NEXT: Alive: <x z>
call void @capture32(ptr %x)
call void @llvm.lifetime.end.p0(i64 -1, ptr %x)
; CHECK: call void @llvm.lifetime.end.p0(i64 -1, ptr %x)
; CHECK-NEXT: Alive: <z>
call void @llvm.lifetime.start.p0(i64 -1, ptr %y)
; CHECK: call void @llvm.lifetime.start.p0(i64 -1, ptr %y)
; CHECK-NEXT: Alive: <y z>
call void @capture32(ptr %y)
call void @llvm.lifetime.end.p0(i64 -1, ptr %y)
; CHECK: call void @llvm.lifetime.end.p0(i64 -1, ptr %y)
; CHECK-NEXT: Alive: <z>
call void @capture32(ptr %z)
call void @llvm.lifetime.end.p0(i64 -1, ptr %z)
; CHECK: call void @llvm.lifetime.end.p0(i64 -1, ptr %z)
; CHECK-NEXT: Alive: <>
ret void
}
define void @no_markers() {
; CHECK-LABEL: define void @no_markers()
entry:
; CHECK: entry:
; CHECK-NEXT: Alive: <y>
%x = alloca i32, align 4
%y = alloca i32, align 4
call void @llvm.lifetime.start.p0(i64 -1, ptr %x)
; CHECK: call void @llvm.lifetime.start.p0(i64 -1, ptr %x)
; CHECK-NEXT: Alive: <x y>
call void @capture32(ptr %x)
call void @llvm.lifetime.end.p0(i64 -1, ptr %x)
; CHECK: call void @llvm.lifetime.end.p0(i64 -1, ptr %x)
; CHECK-NEXT: Alive: <y>
call void @capture32(ptr %y)
ret void
}
define void @g() {
; CHECK-LABEL: define void @g()
entry:
; CHECK: entry:
; CHECK-NEXT: Alive: <>
%x = alloca i32, align 4
%y = alloca i32, align 4
%z = alloca i64, align 4
call void @llvm.lifetime.start.p0(i64 -1, ptr %x)
; CHECK: call void @llvm.lifetime.start.p0(i64 -1, ptr %x)
; CHECK-NEXT: Alive: <x>
call void @llvm.lifetime.start.p0(i64 -1, ptr %y)
; CHECK: call void @llvm.lifetime.start.p0(i64 -1, ptr %y)
; CHECK-NEXT: Alive: <x y>
call void @capture32(ptr %x)
call void @llvm.lifetime.end.p0(i64 -1, ptr %x)
; CHECK: call void @llvm.lifetime.end.p0(i64 -1, ptr %x)
; CHECK-NEXT: Alive: <y>
call void @capture32(ptr %y)
call void @llvm.lifetime.end.p0(i64 -1, ptr %y)
; CHECK: call void @llvm.lifetime.end.p0(i64 -1, ptr %y)
; CHECK-NEXT: Alive: <>
call void @llvm.lifetime.start.p0(i64 -1, ptr %z)
; CHECK: call void @llvm.lifetime.start.p0(i64 -1, ptr %z)
; CHECK-NEXT: Alive: <z>
call void @capture64(ptr %z)
call void @llvm.lifetime.end.p0(i64 -1, ptr %z)
; CHECK: call void @llvm.lifetime.end.p0(i64 -1, ptr %z)
; CHECK-NEXT: Alive: <>
ret void
; CHECK: ret void
; CHECK-NEXT: Alive: <>
}
define void @h() {
; CHECK-LABEL: define void @h()
entry:
; CHECK: entry:
; CHECK-NEXT: Alive: <>
%x = alloca i32, align 16
; CHECK: %x = alloca i32, align 16
; CHECK-NEXT: Alive: <>
%z = alloca i64, align 4
%y = alloca i32, align 4
call void @llvm.lifetime.start.p0(i64 -1, ptr %x)
; CHECK: call void @llvm.lifetime.start.p0(i64 -1, ptr %x)
; CHECK-NEXT: Alive: <x>
call void @llvm.lifetime.start.p0(i64 -1, ptr %y)
; CHECK: call void @llvm.lifetime.start.p0(i64 -1, ptr %y)
; CHECK-NEXT: Alive: <x y>
call void @llvm.lifetime.start.p0(i64 -1, ptr %z)
; CHECK: call void @llvm.lifetime.start.p0(i64 -1, ptr %z)
; CHECK-NEXT: Alive: <x y z>
call void @capture32(ptr %x)
call void @capture32(ptr %y)
call void @capture64(ptr %z)
call void @llvm.lifetime.end.p0(i64 -1, ptr %x)
; CHECK: call void @llvm.lifetime.end.p0(i64 -1, ptr %x)
; CHECK-NEXT: Alive: <y z>
call void @llvm.lifetime.end.p0(i64 -1, ptr %y)
; CHECK: call void @llvm.lifetime.end.p0(i64 -1, ptr %y)
; CHECK-NEXT: Alive: <z>
call void @llvm.lifetime.end.p0(i64 -1, ptr %z)
; CHECK: call void @llvm.lifetime.end.p0(i64 -1, ptr %z)
; CHECK-NEXT: Alive: <>
ret void
}
define void @i(i1 zeroext %a, i1 zeroext %b) {
; CHECK-LABEL: define void @i(i1 zeroext %a, i1 zeroext %b)
entry:
; CHECK: entry:
; CHECK-NEXT: Alive: <>
%x1 = alloca i64, align 8
%x2 = alloca i64, align 8
%y = alloca i64, align 8
%y1 = alloca i64, align 8
%y2 = alloca i64, align 8
%z = alloca i64, align 8
%z1 = alloca i64, align 8
%z2 = alloca i64, align 8
call void @llvm.lifetime.start.p0(i64 -1, ptr %x1)
; CHECK: call void @llvm.lifetime.start.p0(i64 -1, ptr %x1)
; CHECK-NEXT: Alive: <x1>
call void @llvm.lifetime.start.p0(i64 -1, ptr %x2)
; CHECK: call void @llvm.lifetime.start.p0(i64 -1, ptr %x2)
; CHECK-NEXT: Alive: <x1 x2>
call void @capture64(ptr nonnull %x1)
call void @capture64(ptr nonnull %x2)
br i1 %a, label %if.then, label %if.else4
; CHECK: br i1 %a, label %if.then, label %if.else4
; CHECK-NEXT: Alive: <x1 x2>
if.then: ; preds = %entry
; CHECK: if.then:
; CHECK-NEXT: Alive: <x1 x2>
call void @llvm.lifetime.start.p0(i64 -1, ptr %y)
; CHECK: call void @llvm.lifetime.start.p0(i64 -1, ptr %y)
; CHECK-NEXT: Alive: <x1 x2 y>
call void @capture64(ptr nonnull %y)
br i1 %b, label %if.then3, label %if.else
if.then3: ; preds = %if.then
; CHECK: if.then3:
; CHECK-NEXT: Alive: <x1 x2 y>
call void @llvm.lifetime.start.p0(i64 -1, ptr %y1)
; CHECK: call void @llvm.lifetime.start.p0(i64 -1, ptr %y1)
; CHECK-NEXT: Alive: <x1 x2 y y1>
call void @capture64(ptr nonnull %y1)
call void @llvm.lifetime.end.p0(i64 -1, ptr %y1)
; CHECK: call void @llvm.lifetime.end.p0(i64 -1, ptr %y1)
; CHECK-NEXT: Alive: <x1 x2 y>
br label %if.end
if.else: ; preds = %if.then
; CHECK: if.else:
; CHECK-NEXT: Alive: <x1 x2 y>
call void @llvm.lifetime.start.p0(i64 -1, ptr %y2)
; CHECK: call void @llvm.lifetime.start.p0(i64 -1, ptr %y2)
; CHECK-NEXT: Alive: <x1 x2 y y2>
call void @capture64(ptr nonnull %y2)
call void @llvm.lifetime.end.p0(i64 -1, ptr %y2)
; CHECK: call void @llvm.lifetime.end.p0(i64 -1, ptr %y2)
; CHECK-NEXT: Alive: <x1 x2 y>
br label %if.end
if.end: ; preds = %if.else, %if.then3
; CHECK: if.end:
; CHECK-NEXT: Alive: <x1 x2 y>
call void @llvm.lifetime.end.p0(i64 -1, ptr %y)
; CHECK: call void @llvm.lifetime.end.p0(i64 -1, ptr %y)
; CHECK-NEXT: Alive: <x1 x2>
br label %if.end9
if.else4: ; preds = %entry
; CHECK: if.else4:
; CHECK-NEXT: Alive: <x1 x2>
%z.cast = bitcast ptr %z to ptr
; CHECK: %z.cast = bitcast ptr %z to ptr
; CHECK-NEXT: Alive: <x1 x2>
call void @llvm.lifetime.start.p0(i64 -1, ptr %z)
; CHECK: call void @llvm.lifetime.start.p0(i64 -1, ptr %z)
; CHECK-NEXT: Alive: <x1 x2 z>
call void @capture64(ptr nonnull %z)
br i1 %b, label %if.then6, label %if.else7
if.then6: ; preds = %if.else4
; CHECK: if.then6:
; CHECK-NEXT: Alive: <x1 x2 z>
call void @llvm.lifetime.start.p0(i64 -1, ptr %z1)
; CHECK: call void @llvm.lifetime.start.p0(i64 -1, ptr %z1)
; CHECK-NEXT: Alive: <x1 x2 z z1>
call void @capture64(ptr nonnull %z1)
call void @llvm.lifetime.end.p0(i64 -1, ptr %z1)
; CHECK: call void @llvm.lifetime.end.p0(i64 -1, ptr %z1)
; CHECK-NEXT: Alive: <x1 x2 z>
br label %if.end8
if.else7: ; preds = %if.else4
; CHECK: if.else7:
; CHECK-NEXT: Alive: <x1 x2 z>
call void @llvm.lifetime.start.p0(i64 -1, ptr %z2)
; CHECK: call void @llvm.lifetime.start.p0(i64 -1, ptr %z2)
; CHECK-NEXT: Alive: <x1 x2 z z2>
call void @capture64(ptr nonnull %z2)
call void @llvm.lifetime.end.p0(i64 -1, ptr %z2)
; CHECK: call void @llvm.lifetime.end.p0(i64 -1, ptr %z2)
; CHECK-NEXT: Alive: <x1 x2 z>
br label %if.end8
if.end8: ; preds = %if.else7, %if.then6
; CHECK: if.end8:
; CHECK-NEXT: Alive: <x1 x2 z>
call void @llvm.lifetime.end.p0(i64 -1, ptr %z)
; CHECK: call void @llvm.lifetime.end.p0(i64 -1, ptr %z)
; CHECK-NEXT: Alive: <x1 x2>
br label %if.end9
if.end9: ; preds = %if.end8, %if.end
; CHECK: if.end9:
; CHECK-NEXT: Alive: <x1 x2>
call void @llvm.lifetime.end.p0(i64 -1, ptr %x2)
; CHECK: call void @llvm.lifetime.end.p0(i64 -1, ptr %x2)
; CHECK-NEXT: Alive: <x1>
call void @llvm.lifetime.end.p0(i64 -1, ptr %x1)
; CHECK: call void @llvm.lifetime.end.p0(i64 -1, ptr %x1)
; CHECK-NEXT: Alive: <>
ret void
}
define void @no_merge1(i1 %d) {
; CHECK-LABEL: define void @no_merge1(i1 %d)
entry:
; CHECK: entry:
; CHECK-NEXT: Alive: <>
%x = alloca i32, align 4
%y = alloca i32, align 4
call void @llvm.lifetime.start.p0(i64 -1, ptr %x)
; CHECK: call void @llvm.lifetime.start.p0(i64 -1, ptr %x)
; CHECK-NEXT: Alive: <x>
call void @capture32(ptr %x)
br i1 %d, label %bb2, label %bb3
bb2: ; preds = %entry
; CHECK: bb2:
; CHECK-NEXT: Alive: <x>
call void @llvm.lifetime.start.p0(i64 -1, ptr %y)
; CHECK: call void @llvm.lifetime.start.p0(i64 -1, ptr %y)
; CHECK-NEXT: Alive: <x y>
call void @capture32(ptr %y)
call void @llvm.lifetime.end.p0(i64 -1, ptr %y)
; CHECK: call void @llvm.lifetime.end.p0(i64 -1, ptr %y)
; CHECK-NEXT: Alive: <x>
call void @llvm.lifetime.end.p0(i64 -1, ptr %x)
; CHECK: call void @llvm.lifetime.end.p0(i64 -1, ptr %x)
; CHECK-NEXT: Alive: <>
ret void
bb3: ; preds = %entry
; CHECK: bb3:
; CHECK-NEXT: Alive: <x>
call void @llvm.lifetime.end.p0(i64 -1, ptr %x)
; CHECK: call void @llvm.lifetime.end.p0(i64 -1, ptr %x)
; CHECK-NEXT: Alive: <>
ret void
}
define void @merge1(i1 %d) {
; CHECK-LABEL: define void @merge1(i1 %d)
entry:
; CHECK: entry:
; CHECK-NEXT: Alive: <>
%x = alloca i32, align 4
%y = alloca i32, align 4
call void @llvm.lifetime.start.p0(i64 -1, ptr %x)
; CHECK: call void @llvm.lifetime.start.p0(i64 -1, ptr %x)
; CHECK-NEXT: Alive: <x>
call void @capture32(ptr %x)
call void @llvm.lifetime.end.p0(i64 -1, ptr %x)
; CHECK: call void @llvm.lifetime.end.p0(i64 -1, ptr %x)
; CHECK-NEXT: Alive: <>
br i1 %d, label %bb2, label %bb3
bb2: ; preds = %entry
; CHECK: bb2:
; CHECK-NEXT: Alive: <>
call void @llvm.lifetime.start.p0(i64 -1, ptr %y)
; CHECK: call void @llvm.lifetime.start.p0(i64 -1, ptr %y)
; CHECK-NEXT: Alive: <y>
call void @capture32(ptr %y)
call void @llvm.lifetime.end.p0(i64 -1, ptr %y)
; CHECK: call void @llvm.lifetime.end.p0(i64 -1, ptr %y)
; CHECK-NEXT: Alive: <>
ret void
bb3: ; preds = %entry
; CHECK: bb3:
; CHECK-NEXT: Alive: <>
ret void
}
define void @merge2_noend(i1 %d) {
; CHECK-LABEL: define void @merge2_noend(i1 %d)
entry:
; CHECK: entry:
; CHECK-NEXT: Alive: <>
%x = alloca i32, align 4
%y = alloca i32, align 4
call void @llvm.lifetime.start.p0(i64 -1, ptr %x)
; CHECK: call void @llvm.lifetime.start.p0(i64 -1, ptr %x)
; CHECK-NEXT: Alive: <x>
call void @capture32(ptr %x)
call void @llvm.lifetime.end.p0(i64 -1, ptr %x)
; CHECK: call void @llvm.lifetime.end.p0(i64 -1, ptr %x)
; CHECK-NEXT: Alive: <>
br i1 %d, label %bb2, label %bb3
bb2: ; preds = %entry
; CHECK: bb2:
; CHECK-NEXT: Alive: <>
call void @llvm.lifetime.start.p0(i64 -1, ptr %y)
; CHECK: call void @llvm.lifetime.start.p0(i64 -1, ptr %y)
; CHECK-NEXT: Alive: <y>
call void @capture32(ptr %y)
ret void
bb3: ; preds = %entry
; CHECK: bb3:
; CHECK-NEXT: Alive: <>
ret void
}
define void @merge3_noend(i1 %d) {
; CHECK-LABEL: define void @merge3_noend(i1 %d)
entry:
; CHECK: entry:
; CHECK-NEXT: Alive: <>
%x = alloca i32, align 4
%y = alloca i32, align 4
call void @llvm.lifetime.start.p0(i64 -1, ptr %x)
; CHECK: call void @llvm.lifetime.start.p0(i64 -1, ptr %x)
; CHECK-NEXT: Alive: <x>
call void @capture32(ptr %x)
br i1 %d, label %bb2, label %bb3
bb2: ; preds = %entry
; CHECK: bb2:
; CHECK-NEXT: Alive: <x>
call void @llvm.lifetime.end.p0(i64 -1, ptr %x)
; CHECK: call void @llvm.lifetime.end.p0(i64 -1, ptr %x)
; CHECK-NEXT: Alive: <>
call void @llvm.lifetime.start.p0(i64 -1, ptr %y)
; CHECK: call void @llvm.lifetime.start.p0(i64 -1, ptr %y)
; CHECK-NEXT: Alive: <y>
call void @capture32(ptr %y)
ret void
bb3: ; preds = %entry
; CHECK: bb3:
; CHECK-NEXT: Alive: <x>
ret void
}
define void @nomerge4_nostart(i1 %d) {
; CHECK-LABEL: define void @nomerge4_nostart(i1 %d)
entry:
; CHECK: entry:
; CHECK-NEXT: Alive: <x>
%x = alloca i32, align 4
%y = alloca i32, align 4
call void @capture32(ptr %x)
call void @llvm.lifetime.end.p0(i64 -1, ptr %x)
; CHECK: call void @llvm.lifetime.end.p0(i64 -1, ptr %x)
; CHECK-NEXT: Alive: <x>
br i1 %d, label %bb2, label %bb3
bb2: ; preds = %entry
; CHECK: bb2:
; CHECK-NEXT: Alive: <x>
call void @llvm.lifetime.start.p0(i64 -1, ptr %y)
; CHECK: call void @llvm.lifetime.start.p0(i64 -1, ptr %y)
; CHECK-NEXT: Alive: <x y>
call void @capture32(ptr %y)
ret void
bb3: ; preds = %entry
; CHECK: bb3:
; CHECK-NEXT: Alive: <x>
ret void
}
define void @array_merge() {
; CHECK-LABEL: define void @array_merge()
entry:
; CHECK: entry:
; CHECK-NEXT: Alive: <>
%A.i1 = alloca [100 x i32], align 4
%B.i2 = alloca [100 x i32], align 4
%A.i = alloca [100 x i32], align 4
%B.i = alloca [100 x i32], align 4
call void @llvm.lifetime.start.p0(i64 -1, ptr %A.i)
; CHECK: call void @llvm.lifetime.start.p0(i64 -1, ptr %A.i)
; CHECK-NEXT: Alive: <A.i>
call void @llvm.lifetime.start.p0(i64 -1, ptr %B.i)
; CHECK: call void @llvm.lifetime.start.p0(i64 -1, ptr %B.i)
; CHECK-NEXT: Alive: <A.i B.i>
call void @capture100x32(ptr %A.i)
; CHECK: call void @capture100x32(ptr %A.i)
; CHECK-NEXT: Alive: <A.i B.i>
call void @capture100x32(ptr %B.i)
call void @llvm.lifetime.end.p0(i64 -1, ptr %A.i)
; CHECK: call void @llvm.lifetime.end.p0(i64 -1, ptr %A.i)
; CHECK-NEXT: Alive: <B.i>
call void @llvm.lifetime.end.p0(i64 -1, ptr %B.i)
; CHECK: call void @llvm.lifetime.end.p0(i64 -1, ptr %B.i)
; CHECK-NEXT: Alive: <>
call void @llvm.lifetime.start.p0(i64 -1, ptr %A.i1)
; CHECK: call void @llvm.lifetime.start.p0(i64 -1, ptr %A.i1)
; CHECK-NEXT: Alive: <A.i1>
call void @llvm.lifetime.start.p0(i64 -1, ptr %B.i2)
; CHECK: call void @llvm.lifetime.start.p0(i64 -1, ptr %B.i2)
; CHECK-NEXT: Alive: <A.i1 B.i2>
call void @capture100x32(ptr %A.i1)
call void @capture100x32(ptr %B.i2)
call void @llvm.lifetime.end.p0(i64 -1, ptr %A.i1)
; CHECK: call void @llvm.lifetime.end.p0(i64 -1, ptr %A.i1)
; CHECK-NEXT: Alive: <B.i2>
call void @llvm.lifetime.end.p0(i64 -1, ptr %B.i2)
; CHECK: call void @llvm.lifetime.end.p0(i64 -1, ptr %B.i2)
; CHECK-NEXT: Alive: <>
ret void
}
define void @myCall_pr15707() {
; CHECK-LABEL: define void @myCall_pr15707()
entry:
; CHECK: entry:
; CHECK-NEXT: Alive: <>
%buf1 = alloca i8, i32 100000, align 16
%buf2 = alloca i8, i32 100000, align 16
call void @llvm.lifetime.start.p0(i64 -1, ptr %buf1)
; CHECK: call void @llvm.lifetime.start.p0(i64 -1, ptr %buf1)
; CHECK-NEXT: Alive: <buf1>
call void @llvm.lifetime.end.p0(i64 -1, ptr %buf1)
; CHECK: call void @llvm.lifetime.end.p0(i64 -1, ptr %buf1)
; CHECK-NEXT: Alive: <>
call void @llvm.lifetime.start.p0(i64 -1, ptr %buf1)
; CHECK: call void @llvm.lifetime.start.p0(i64 -1, ptr %buf1)
; CHECK-NEXT: Alive: <buf1>
call void @llvm.lifetime.start.p0(i64 -1, ptr %buf2)
; CHECK: call void @llvm.lifetime.start.p0(i64 -1, ptr %buf2)
; CHECK-NEXT: Alive: <buf1 buf2>
call void @capture8(ptr %buf1)
call void @capture8(ptr %buf2)
ret void
}
define void @bad_range() {
; CHECK-LABEL: define void @bad_range()
entry:
; CHECK: entry:
; CHECK-NEXT: Alive: <A.i1 B.i2>
%A.i1 = alloca [100 x i32], align 4
%B.i2 = alloca [100 x i32], align 4
%A.i = alloca [100 x i32], align 4
%B.i = alloca [100 x i32], align 4
call void @llvm.lifetime.start.p0(i64 -1, ptr %A.i)
; CHECK: call void @llvm.lifetime.start.p0(i64 -1, ptr %A.i)
; CHECK-NEXT: Alive: <A.i A.i1 B.i2>
call void @llvm.lifetime.start.p0(i64 -1, ptr %B.i)
; CHECK: call void @llvm.lifetime.start.p0(i64 -1, ptr %B.i)
; CHECK-NEXT: Alive: <A.i A.i1 B.i B.i2>
call void @capture100x32(ptr %A.i)
call void @capture100x32(ptr %B.i)
call void @llvm.lifetime.end.p0(i64 -1, ptr %A.i)
; CHECK: call void @llvm.lifetime.end.p0(i64 -1, ptr %A.i)
; CHECK-NEXT: Alive: <A.i1 B.i B.i2>
call void @llvm.lifetime.end.p0(i64 -1, ptr %B.i)
; CHECK: call void @llvm.lifetime.end.p0(i64 -1, ptr %B.i)
; CHECK-NEXT: Alive: <A.i1 B.i2>
br label %block2
block2: ; preds = %entry
; CHECK: block2:
; CHECK-NEXT: Alive: <A.i1 B.i2>
call void @capture100x32(ptr %A.i)
call void @capture100x32(ptr %B.i)
ret void
}
%struct.Klass = type { i32, i32 }
define i32 @shady_range(i32 %argc, ptr captures(none) %argv) {
; CHECK-LABEL: define i32 @shady_range(i32 %argc, ptr captures(none) %argv)
entry:
; CHECK: entry:
; CHECK-NEXT: Alive: <>
%a.i = alloca [4 x %struct.Klass], align 16
%b.i = alloca [4 x %struct.Klass], align 16
call void @llvm.lifetime.start.p0(i64 -1, ptr %a.i)
; CHECK: call void @llvm.lifetime.start.p0(i64 -1, ptr %a.i)
; CHECK-NEXT: Alive: <a.i>
call void @llvm.lifetime.start.p0(i64 -1, ptr %b.i)
; CHECK: call void @llvm.lifetime.start.p0(i64 -1, ptr %b.i)
; CHECK-NEXT: Alive: <a.i b.i>
call void @capture8(ptr %a.i)
call void @capture8(ptr %b.i)
%z3 = load i32, ptr %a.i, align 16
call void @llvm.lifetime.end.p0(i64 -1, ptr %a.i)
; CHECK: call void @llvm.lifetime.end.p0(i64 -1, ptr %a.i)
; CHECK-NEXT: Alive: <b.i>
call void @llvm.lifetime.end.p0(i64 -1, ptr %b.i)
; CHECK: call void @llvm.lifetime.end.p0(i64 -1, ptr %b.i)
; CHECK-NEXT: Alive: <>
ret i32 %z3
}
define void @end_loop() {
; CHECK-LABEL: define void @end_loop()
entry:
; CHECK: entry:
; CHECK-NEXT: Alive: <>
%x = alloca i8, align 4
call void @llvm.lifetime.start.p0(i64 1, ptr %x)
; CHECK: call void @llvm.lifetime.start.p0(i64 1, ptr %x)
; CHECK-NEXT: Alive: <x>
br label %l2
l2: ; preds = %l2, %entry
; CHECK: l2:
; MAY-NEXT: Alive: <x>
; MUST-NEXT: Alive: <>
call void @capture8(ptr %x)
call void @llvm.lifetime.end.p0(i64 1, ptr %x)
; CHECK: call void @llvm.lifetime.end.p0(i64 1, ptr %x)
; CHECK-NEXT: Alive: <>
br label %l2
}
define void @start_loop() {
; CHECK-LABEL: define void @start_loop()
entry:
; CHECK: entry:
; CHECK-NEXT: Alive: <>
%x = alloca i8, align 4
%y = alloca i8, align 4
call void @llvm.lifetime.start.p0(i64 1, ptr %x)
; CHECK: call void @llvm.lifetime.start.p0(i64 1, ptr %x)
; CHECK-NEXT: Alive: <x>
br label %l2
l2: ; preds = %l2, %entry
; CHECK: l2:
; CHECK-NEXT: Alive: <x>
call void @llvm.lifetime.start.p0(i64 1, ptr %y)
; CHECK: call void @llvm.lifetime.start.p0(i64 1, ptr %y)
; CHECK-NEXT: Alive: <x y>
call void @capture8(ptr %y)
call void @llvm.lifetime.end.p0(i64 1, ptr %y)
; CHECK: call void @llvm.lifetime.end.p0(i64 1, ptr %y)
; CHECK-NEXT: Alive: <x>
call void @llvm.lifetime.start.p0(i64 1, ptr %x)
; CHECK: call void @llvm.lifetime.start.p0(i64 1, ptr %x)
; CHECK-NEXT: Alive: <x>
call void @capture8(ptr %x)
br label %l2
}
%struct.char_array = type { [500 x i8] }
define dso_local void @gep_test(i32 %cond) {
; CHECK-LABEL: define dso_local void @gep_test
entry:
; CHECK: entry:
; CHECK-NEXT: Alive: <>
%a = alloca %struct.char_array, align 8
%b = alloca %struct.char_array, align 8
%tobool.not = icmp eq i32 %cond, 0
br i1 %tobool.not, label %if.else, label %if.then
if.then: ; preds = %entry
; CHECK: if.then:
; CHECK-NEXT: Alive: <>
call void @llvm.lifetime.start.p0(i64 500, ptr nonnull %a)
; CHECK: call void @llvm.lifetime.start.p0(i64 500, ptr nonnull %a)
; CHECK-NEXT: Alive: <a>
tail call void @capture8(ptr %a)
call void @llvm.lifetime.end.p0(i64 500, ptr nonnull %a)
; CHECK: call void @llvm.lifetime.end.p0(i64 500, ptr nonnull %a)
; CHECK-NEXT: Alive: <>
br label %if.end
if.else: ; preds = %entry
; CHECK: if.else:
; CHECK-NEXT: Alive: <>
call void @llvm.lifetime.start.p0(i64 500, ptr nonnull %b)
; CHECK: call void @llvm.lifetime.start.p0(i64 500, ptr nonnull %b)
; CHECK-NEXT: Alive: <b>
tail call void @capture8(ptr %b)
call void @llvm.lifetime.end.p0(i64 500, ptr nonnull %b)
; CHECK: call void @llvm.lifetime.end.p0(i64 500, ptr nonnull %b)
; CHECK-NEXT: Alive: <>
br label %if.end
if.end: ; preds = %if.else, %if.then
; CHECK: if.end:
; CHECK-NEXT: Alive: <>
ret void
}
define void @if_must(i1 %a) {
; CHECK-LABEL: define void @if_must
entry:
; CHECK: entry:
; CHECK-NEXT: Alive: <>
%x = alloca i8, align 4
%y = alloca i8, align 4
br i1 %a, label %if.then, label %if.else
; CHECK: br i1 %a, label %if.then, label %if.else
; CHECK-NEXT: Alive: <>
if.then:
; CHECK: if.then:
; CHECK-NEXT: Alive: <>
call void @llvm.lifetime.start.p0(i64 1, ptr %y)
; CHECK: call void @llvm.lifetime.start.p0(i64 1, ptr %y)
; CHECK-NEXT: Alive: <y>
br label %if.end
; CHECK: br label %if.end
; CHECK-NEXT: Alive: <y>
if.else:
; CHECK: if.else:
; CHECK-NEXT: Alive: <>
call void @llvm.lifetime.start.p0(i64 1, ptr %y)
; CHECK: call void @llvm.lifetime.start.p0(i64 1, ptr %y)
; CHECK-NEXT: Alive: <y>
call void @llvm.lifetime.start.p0(i64 1, ptr %x)
; CHECK: call void @llvm.lifetime.start.p0(i64 1, ptr %x)
; CHECK-NEXT: Alive: <x y>
br label %if.end
; CHECK: br label %if.end
; CHECK-NEXT: Alive: <x y>
if.end:
; CHECK: if.end:
; MAY-NEXT: Alive: <x y>
; MUST-NEXT: Alive: <y>
ret void
}
define void @unreachable() {
; CHECK-LABEL: define void @unreachable
entry:
; CHECK: entry:
; CHECK-NEXT: Alive: <>
%x = alloca i8, align 4
%y = alloca i8, align 4
call void @llvm.lifetime.start.p0(i64 1, ptr %y)
; CHECK: call void @llvm.lifetime.start.p0(i64 1, ptr %y)
; CHECK-NEXT: Alive: <y>
call void @llvm.lifetime.start.p0(i64 1, ptr %x)
; CHECK: call void @llvm.lifetime.start.p0(i64 1, ptr %x)
; CHECK-NEXT: Alive: <x y>
br label %end
; CHECK: br label %end
; CHECK-NEXT: Alive: <x y>
dead:
; CHECK: dead:
; CHECK-NOT: Alive:
call void @llvm.lifetime.start.p0(i64 4, ptr %y)
br label %end
; CHECK: br label %end
; CHECK-NOT: Alive:
end:
; CHECK: end:
; CHECK-NEXT: Alive: <x y>
ret void
}
define void @alloca_size() {
; CHECK-LABEL: define void @alloca_size
entry:
; CHECK: entry:
; MAY-NEXT: Alive: <x>
; MUST-NEXT: Alive: <>
%x = alloca [5 x i32], align 4
call void @llvm.lifetime.start.p0(i64 15, ptr %x)
; CHECK: call void @llvm.lifetime.start.p0(i64 15, ptr %x)
; MAY-NEXT: Alive: <x>
; MUST-NEXT: Alive: <>
call void @llvm.lifetime.end.p0(i64 15, ptr %x)
; CHECK: call void @llvm.lifetime.end.p0(i64 15, ptr %x)
; MAY-NEXT: Alive: <x>
; MUST-NEXT: Alive: <>
ret void
}
define void @multiple_start_end() {
; CHECK-LABEL: define void @multiple_start_end
entry:
; CHECK: entry:
; CHECK-NEXT: Alive: <>
%x = alloca i8
call void @llvm.lifetime.start.p0(i64 1, ptr %x)
; CHECK: call void @llvm.lifetime.start.p0(i64 1, ptr %x)
; CHECK-NEXT: Alive: <x>
call void @llvm.lifetime.start.p0(i64 1, ptr %x)
; CHECK: call void @llvm.lifetime.start.p0(i64 1, ptr %x)
; CHECK-NEXT: Alive: <x>
call void @llvm.lifetime.end.p0(i64 1, ptr %x)
; CHECK: call void @llvm.lifetime.end.p0(i64 1, ptr %x)
; CHECK-NEXT: Alive: <>
call void @llvm.lifetime.end.p0(i64 1, ptr %x)
; CHECK: call void @llvm.lifetime.end.p0(i64 1, ptr %x)
; CHECK-NEXT: Alive: <>
ret void
}
define void @if_must1(i1 %a) {
; CHECK-LABEL: define void @if_must1
entry:
; CHECK: entry:
; CHECK-NEXT: Alive: <>
%x = alloca i8, align 4
%y = alloca i8, align 4
br i1 %a, label %if.then, label %if.else
; CHECK: br i1 %a, label %if.then, label %if.else
; CHECK-NEXT: Alive: <>
if.then:
; CHECK: if.then:
; MAY-NEXT: Alive: <x y>
; MUST-NEXT: Alive: <>
call void @llvm.lifetime.end.p0(i64 1, ptr %y)
; CHECK: call void @llvm.lifetime.end.p0(i64 1, ptr %y)
; MAY-NEXT: Alive: <x>
; MUST-NEXT: Alive: <>
br label %if.end
; CHECK: br label %if.end
; MAY-NEXT: Alive: <x>
; MUST-NEXT: Alive: <>
if.else:
; CHECK: if.else:
; CHECK-NEXT: Alive: <>
call void @llvm.lifetime.start.p0(i64 1, ptr %y)
; CHECK: call void @llvm.lifetime.start.p0(i64 1, ptr %y)
; CHECK-NEXT: Alive: <y>
call void @llvm.lifetime.start.p0(i64 1, ptr %x)
; CHECK: call void @llvm.lifetime.start.p0(i64 1, ptr %x)
; CHECK-NEXT: Alive: <x y>
br label %if.then
; CHECK: br label %if.then
; CHECK-NEXT: Alive: <x y>
if.end:
; CHECK: if.end:
; MAY-NEXT: Alive: <x>
; MUST-NEXT: Alive: <>
ret void
}
define void @if_must2(i1 %a) {
; CHECK-LABEL: define void @if_must2
entry:
; CHECK: entry:
; CHECK-NEXT: Alive: <>
%x = alloca i8, align 4
%y = alloca i8, align 4
call void @llvm.lifetime.start.p0(i64 1, ptr %x)
; CHECK: call void @llvm.lifetime.start.p0(i64 1, ptr %x)
; CHECK-NEXT: Alive: <x>
br i1 %a, label %if.then, label %if.else
; CHECK: br i1 %a, label %if.then, label %if.else
; CHECK-NEXT: Alive: <x>
if.then:
; CHECK: if.then:
; MAY-NEXT: Alive: <x>
; MUST-NEXT: Alive: <>
call void @llvm.lifetime.start.p0(i64 1, ptr %y)
; CHECK: call void @llvm.lifetime.start.p0(i64 1, ptr %y)
; MAY-NEXT: Alive: <x y>
; MUST-NEXT: Alive: <y>
br label %if.end
; CHECK: br label %if.end
; MAY-NEXT: Alive: <x y>
; MUST-NEXT: Alive: <y>
if.else:
; CHECK: if.else:
; CHECK-NEXT: Alive: <x>
call void @llvm.lifetime.end.p0(i64 1, ptr %y)
; CHECK: call void @llvm.lifetime.end.p0(i64 1, ptr %y)
; CHECK-NEXT: Alive: <x>
call void @llvm.lifetime.end.p0(i64 1, ptr %x)
; CHECK: call void @llvm.lifetime.end.p0(i64 1, ptr %x)
; CHECK-NEXT: Alive: <>
br label %if.then
; CHECK: br label %if.then
; CHECK-NEXT: Alive: <>
if.end:
; CHECK: if.end:
; MAY-NEXT: Alive: <x y>
; MUST-NEXT: Alive: <y>
ret void
}
define void @cycle(i1 %a) {
; CHECK-LABEL: define void @cycle
entry:
; CHECK: entry:
; CHECK-NEXT: Alive: <>
%x = alloca i8, align 4
%y = alloca i8, align 4
call void @llvm.lifetime.start.p0(i64 1, ptr %x)
; CHECK: call void @llvm.lifetime.start.p0(i64 1, ptr %x)
; CHECK-NEXT: Alive: <x>
br i1 %a, label %if.then, label %if.end
; CHECK: br i1 %a, label %if.then, label %if.end
; CHECK-NEXT: Alive: <x>
if.then:
; CHECK: if.then:
; MAY-NEXT: Alive: <x y>
; MUST-NEXT: Alive: <x>
call void @llvm.lifetime.start.p0(i64 1, ptr %y)
; CHECK: call void @llvm.lifetime.start.p0(i64 1, ptr %y)
; CHECK-NEXT: Alive: <x y>
br i1 %a, label %if.then, label %if.end
; CHECK: br i1 %a, label %if.then, label %if.end
; CHECK-NEXT: Alive: <x y>
if.end:
; CHECK: if.end:
; MAY-NEXT: Alive: <x y>
; MUST-NEXT: Alive: <x>
ret void
}
declare void @llvm.lifetime.start.p0(i64, ptr captures(none))
declare void @llvm.lifetime.end.p0(i64, ptr captures(none))
declare void @capture8(ptr)
declare void @capture32(ptr)
declare void @capture64(ptr)
declare void @capture100x32(ptr)
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