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llvm-mirror/test/CodeGen/WinEH/wineh-cloning.ll
Joseph Tremoulet 16f1fe4cea [WinEH] Fix endpad coloring/numbering
Summary:
When a cleanup's cleanupendpad or cleanupret targets a catchendpad, stop
trying to propagate the cleanup's parent's color to the catchendpad, since
what's needed is the cleanup's grandparent's color and the catchendpad
will get that color from the catchpad linkage already.  We already had
this exclusion for invokes, but were missing it for
cleanupendpad/cleanupret.

Also add a missing line that tags cleanupendpads' states in the
EHPadStateMap, without with lowering invokes that target cleanupendpads
which unwind to other handlers (and so don't have the -1 state) will fail.

This fixes the reduced IR repro in PR25163.


Reviewers: majnemer, andrew.w.kaylor, rnk

Subscribers: llvm-commits

Differential Revision: http://reviews.llvm.org/D13797

llvm-svn: 250534
2015-10-16 18:08:16 +00:00

567 lines
16 KiB
LLVM

; RUN: opt -mtriple=x86_x64-pc-windows-msvc -S -winehprepare < %s | FileCheck %s
declare i32 @__CxxFrameHandler3(...)
declare void @f()
declare i32 @g()
declare void @h(i32)
declare i1 @b()
define void @test1() personality i32 (...)* @__CxxFrameHandler3 {
entry:
; %x def colors: {entry} subset of use colors; must spill
%x = call i32 @g()
invoke void @f()
to label %noreturn unwind label %catch
catch:
catchpad []
to label %noreturn unwind label %endcatch
noreturn:
; %x use colors: {entry, cleanup}
call void @h(i32 %x)
unreachable
endcatch:
catchendpad unwind to caller
}
; Need two copies of the call to @h, one under entry and one under catch.
; Currently we generate a load for each, though we shouldn't need one
; for the use in entry's copy.
; CHECK-LABEL: define void @test1(
; CHECK: entry:
; CHECK: store i32 %x, i32* [[Slot:%[^ ]+]]
; CHECK: invoke void @f()
; CHECK: to label %[[EntryCopy:[^ ]+]] unwind label %catch
; CHECK: catch:
; CHECK: catchpad []
; CHECK-NEXT: to label %[[CatchCopy:[^ ]+]] unwind
; CHECK: [[CatchCopy]]:
; CHECK: [[LoadX2:%[^ ]+]] = load i32, i32* [[Slot]]
; CHECK: call void @h(i32 [[LoadX2]]
; CHECK: [[EntryCopy]]:
; CHECK: [[LoadX1:%[^ ]+]] = load i32, i32* [[Slot]]
; CHECK: call void @h(i32 [[LoadX1]]
define void @test2() personality i32 (...)* @__CxxFrameHandler3 {
entry:
invoke void @f()
to label %exit unwind label %cleanup
cleanup:
cleanuppad []
br label %exit
exit:
call void @f()
ret void
}
; Need two copies of %exit's call to @f -- the subsequent ret is only
; valid when coming from %entry, but on the path from %cleanup, this
; might be a valid call to @f which might dynamically not return.
; CHECK-LABEL: define void @test2(
; CHECK: entry:
; CHECK: invoke void @f()
; CHECK: to label %[[exit:[^ ]+]] unwind label %cleanup
; CHECK: cleanup:
; CHECK: cleanuppad []
; CHECK: call void @f()
; CHECK-NEXT: unreachable
; CHECK: [[exit]]:
; CHECK: call void @f()
; CHECK-NEXT: ret void
define void @test3() personality i32 (...)* @__CxxFrameHandler3 {
entry:
invoke void @f()
to label %invoke.cont unwind label %catch
invoke.cont:
invoke void @f()
to label %exit unwind label %cleanup
catch:
catchpad [] to label %shared unwind label %endcatch
endcatch:
catchendpad unwind to caller
cleanup:
cleanuppad []
br label %shared
shared:
call void @f()
br label %exit
exit:
ret void
}
; Need two copies of %shared's call to @f (similar to @test2 but
; the two regions here are siblings, not parent-child).
; CHECK-LABEL: define void @test3(
; CHECK: invoke void @f()
; CHECK: invoke void @f()
; CHECK: to label %[[exit:[^ ]+]] unwind
; CHECK: catch:
; CHECK: catchpad []
; CHECK-NEXT: to label %[[shared:[^ ]+]] unwind
; CHECK: cleanup:
; CHECK: cleanuppad []
; CHECK: call void @f()
; CHECK-NEXT: unreachable
; CHECK: [[shared]]:
; CHECK: call void @f()
; CHECK-NEXT: unreachable
; CHECK: [[exit]]:
; CHECK: ret void
define void @test4() personality i32 (...)* @__CxxFrameHandler3 {
entry:
invoke void @f()
to label %shared unwind label %catch
catch:
catchpad []
to label %shared unwind label %endcatch
endcatch:
catchendpad unwind to caller
shared:
%x = call i32 @g()
%i = call i32 @g()
%zero.trip = icmp eq i32 %i, 0
br i1 %zero.trip, label %exit, label %loop
loop:
%i.loop = phi i32 [ %i, %shared ], [ %i.dec, %loop.tail ]
%b = call i1 @b()
br i1 %b, label %left, label %right
left:
%y = call i32 @g()
br label %loop.tail
right:
call void @h(i32 %x)
br label %loop.tail
loop.tail:
%i.dec = sub i32 %i.loop, 1
%done = icmp eq i32 %i.dec, 0
br i1 %done, label %exit, label %loop
exit:
call void @h(i32 %x)
unreachable
}
; Make sure we can clone regions that have internal control
; flow and SSA values. Here we need two copies of everything
; from %shared to %exit.
; CHECK-LABEL: define void @test4(
; CHECK: entry:
; CHECK: to label %[[shared_E:[^ ]+]] unwind label %catch
; CHECK: catch:
; CHECK: to label %[[shared_C:[^ ]+]] unwind label %endcatch
; CHECK: [[shared_C]]:
; CHECK: [[x_C:%[^ ]+]] = call i32 @g()
; CHECK: [[i_C:%[^ ]+]] = call i32 @g()
; CHECK: [[zt_C:%[^ ]+]] = icmp eq i32 [[i_C]], 0
; CHECK: br i1 [[zt_C]], label %[[exit_C:[^ ]+]], label %[[loop_C:[^ ]+]]
; CHECK: [[shared_E]]:
; CHECK: [[x_E:%[^ ]+]] = call i32 @g()
; CHECK: [[i_E:%[^ ]+]] = call i32 @g()
; CHECK: [[zt_E:%[^ ]+]] = icmp eq i32 [[i_E]], 0
; CHECK: br i1 [[zt_E]], label %[[exit_E:[^ ]+]], label %[[loop_E:[^ ]+]]
; CHECK: [[loop_C]]:
; CHECK: [[iloop_C:%[^ ]+]] = phi i32 [ [[i_C]], %[[shared_C]] ], [ [[idec_C:%[^ ]+]], %[[looptail_C:[^ ]+]] ]
; CHECK: [[b_C:%[^ ]+]] = call i1 @b()
; CHECK: br i1 [[b_C]], label %[[left_C:[^ ]+]], label %[[right_C:[^ ]+]]
; CHECK: [[loop_E]]:
; CHECK: [[iloop_E:%[^ ]+]] = phi i32 [ [[i_E]], %[[shared_E]] ], [ [[idec_E:%[^ ]+]], %[[looptail_E:[^ ]+]] ]
; CHECK: [[b_E:%[^ ]+]] = call i1 @b()
; CHECK: br i1 [[b_E]], label %[[left_E:[^ ]+]], label %[[right_E:[^ ]+]]
; CHECK: [[left_C]]:
; CHECK: [[y_C:%[^ ]+]] = call i32 @g()
; CHECK: br label %[[looptail_C]]
; CHECK: [[left_E]]:
; CHECK: [[y_E:%[^ ]+]] = call i32 @g()
; CHECK: br label %[[looptail_E]]
; CHECK: [[right_C]]:
; CHECK: call void @h(i32 [[x_C]])
; CHECK: br label %[[looptail_C]]
; CHECK: [[right_E]]:
; CHECK: call void @h(i32 [[x_E]])
; CHECK: br label %[[looptail_E]]
; CHECK: [[looptail_C]]:
; CHECK: [[idec_C]] = sub i32 [[iloop_C]], 1
; CHECK: [[done_C:%[^ ]+]] = icmp eq i32 [[idec_C]], 0
; CHECK: br i1 [[done_C]], label %[[exit_C]], label %[[loop_C]]
; CHECK: [[looptail_E]]:
; CHECK: [[idec_E]] = sub i32 [[iloop_E]], 1
; CHECK: [[done_E:%[^ ]+]] = icmp eq i32 [[idec_E]], 0
; CHECK: br i1 [[done_E]], label %[[exit_E]], label %[[loop_E]]
; CHECK: [[exit_C]]:
; CHECK: call void @h(i32 [[x_C]])
; CHECK: unreachable
; CHECK: [[exit_E]]:
; CHECK: call void @h(i32 [[x_E]])
; CHECK: unreachable
define void @test5() personality i32 (...)* @__CxxFrameHandler3 {
entry:
invoke void @f()
to label %exit unwind label %outer
outer:
%o = cleanuppad []
%x = call i32 @g()
invoke void @f()
to label %outer.ret unwind label %inner
inner:
%i = catchpad []
to label %inner.catch unwind label %inner.endcatch
inner.catch:
catchret %i to label %outer.post-inner
inner.endcatch:
catchendpad unwind to caller
outer.post-inner:
call void @h(i32 %x)
br label %outer.ret
outer.ret:
cleanupret %o unwind to caller
exit:
ret void
}
; Simple nested case (catch-inside-cleanup). Nothing needs
; to be cloned. The def and use of %x are both in %outer
; and so don't need to be spilled.
; CHECK-LABEL: define void @test5(
; CHECK: outer:
; CHECK: %x = call i32 @g()
; CHECK-NEXT: invoke void @f()
; CHECK-NEXT: to label %outer.ret unwind label %inner
; CHECK: inner:
; CHECK: to label %inner.catch unwind label %inner.endcatch
; CHECK: inner.catch:
; CHECK-NEXT: catchret %i to label %outer.post-inner
; CHECK: outer.post-inner:
; CHECK-NEXT: call void @h(i32 %x)
; CHECK-NEXT: br label %outer.ret
define void @test6() personality i32 (...)* @__CxxFrameHandler3 {
entry:
invoke void @f()
to label %invoke.cont unwind label %left
invoke.cont:
invoke void @f()
to label %exit unwind label %right
left:
cleanuppad []
br label %shared
right:
catchpad []
to label %right.catch unwind label %right.end
right.catch:
br label %shared
right.end:
catchendpad unwind to caller
shared:
%x = call i32 @g()
invoke void @f()
to label %shared.cont unwind label %inner
shared.cont:
unreachable
inner:
%i = cleanuppad []
call void @h(i32 %x)
cleanupret %i unwind label %right.end
exit:
ret void
}
; %inner is a cleanup which appears both as a child of
; %left and as a child of %right. Since statically we
; need each funclet to have a single parent, we need to
; clone the entire %inner funclet so we can have one
; copy under each parent. The cleanupret in %inner
; unwinds to the catchendpad for %right, so the copy
; of %inner under %right should include it; the copy
; of %inner under %left should instead have an
; `unreachable` inserted there, but the copy under
; %left still needs to be created because it's possible
; the dynamic path enters %left, then enters %inner,
; then calls @h, and that the call to @h doesn't return.
; CHECK-LABEL: define void @test6(
; TODO: CHECKs
define void @test7() personality i32 (...)* @__CxxFrameHandler3 {
entry:
invoke void @f()
to label %invoke.cont unwind label %left
invoke.cont:
invoke void @f()
to label %unreachable unwind label %right
left:
cleanuppad []
invoke void @f() to label %unreachable unwind label %inner
right:
catchpad []
to label %right.catch unwind label %right.end
right.catch:
invoke void @f() to label %unreachable unwind label %inner
right.end:
catchendpad unwind to caller
inner:
%i = cleanuppad []
%x = call i32 @g()
call void @h(i32 %x)
cleanupret %i unwind label %right.end
unreachable:
unreachable
}
; Another case of a two-parent child (like @test6), this time
; with the join at the entry itself instead of following a
; non-pad join.
; CHECK-LABEL: define void @test7(
; TODO: CHECKs
define void @test8() personality i32 (...)* @__CxxFrameHandler3 {
entry:
invoke void @f()
to label %invoke.cont unwind label %left
invoke.cont:
invoke void @f()
to label %unreachable unwind label %right
left:
cleanuppad []
br label %shared
right:
catchpad []
to label %right.catch unwind label %right.end
right.catch:
br label %shared
right.end:
catchendpad unwind to caller
shared:
invoke void @f()
to label %unreachable unwind label %inner
inner:
cleanuppad []
invoke void @f()
to label %unreachable unwind label %inner.child
inner.child:
cleanuppad []
%x = call i32 @g()
call void @h(i32 %x)
unreachable
unreachable:
unreachable
}
; %inner is a two-parent child which itself has a child; need
; to make two copies of both the %inner and %inner.child.
; CHECK-LABEL: define void @test8(
; TODO: CHECKs
define void @test9() personality i32 (...)* @__CxxFrameHandler3 {
entry:
invoke void @f()
to label %invoke.cont unwind label %left
invoke.cont:
invoke void @f()
to label %unreachable unwind label %right
left:
cleanuppad []
call void @h(i32 1)
invoke void @f()
to label %unreachable unwind label %right
right:
cleanuppad []
call void @h(i32 2)
invoke void @f()
to label %unreachable unwind label %left
unreachable:
unreachable
}
; This is an irreducible loop with two funclets that enter each other;
; need to make two copies of each funclet (one a child of root, the
; other a child of the opposite funclet), but also make sure not to
; clone self-descendants (if we tried to do that we'd need to make an
; infinite number of them). Presumably if optimizations ever generated
; such a thing it would mean that one of the two cleanups was originally
; the parent of the other, but that we'd somehow lost track in the CFG
; of which was which along the way; generating each possibility lets
; whichever case was correct execute correctly.
; CHECK-LABEL: define void @test9(
; TODO: CHECKs
define void @test10() personality i32 (...)* @__CxxFrameHandler3 {
entry:
invoke void @f()
to label %unreachable unwind label %inner
inner:
%cleanup = cleanuppad []
; make sure we don't overlook this cleanupret and try to process
; successor %outer as a child of inner.
cleanupret %cleanup unwind label %outer
outer:
%catch = catchpad [] to label %catch.body unwind label %endpad
catch.body:
catchret %catch to label %exit
endpad:
catchendpad unwind to caller
exit:
ret void
unreachable:
unreachable
}
; CHECK-LABEL: define void @test10(
; CHECK-NEXT: entry:
; CHECK-NEXT: invoke
; CHECK-NEXT: to label %unreachable unwind label %inner
; CHECK: inner:
; CHECK-NEXT: %cleanup = cleanuppad
; CHECK-NEXT: cleanupret %cleanup unwind label %outer
; CHECK: outer:
; CHECK-NEXT: %catch = catchpad []
; CHECK-NEXT: to label %catch.body unwind label %endpad
; CHECK: catch.body:
; CHECK-NEXT: catchret %catch to label %exit
; CHECK: endpad:
; CHECK-NEXT: catchendpad unwind to caller
; CHECK: exit:
; CHECK-NEXT: ret void
define void @test11() personality i32 (...)* @__CxxFrameHandler3 {
entry:
invoke void @f()
to label %exit unwind label %cleanup.outer
cleanup.outer:
%outer = cleanuppad []
invoke void @f()
to label %outer.cont unwind label %cleanup.inner
outer.cont:
br label %merge
cleanup.inner:
%inner = cleanuppad []
br label %merge
merge:
invoke void @f()
to label %unreachable unwind label %merge.end
unreachable:
unreachable
merge.end:
cleanupendpad %outer unwind to caller
exit:
ret void
}
; merge.end will get cloned for outer and inner, but is implausible
; from inner, so the invoke @f() in inner's copy of merge should be
; rewritten to call @f()
; CHECK-LABEL: define void @test11()
; CHECK: %inner = cleanuppad []
; CHECK-NEXT: call void @f()
; CHECK-NEXT: unreachable
define void @test12() personality i32 (...)* @__CxxFrameHandler3 {
entry:
invoke void @f()
to label %cont unwind label %left, !dbg !8
cont:
invoke void @f()
to label %exit unwind label %right
left:
cleanuppad []
br label %join
right:
cleanuppad []
br label %join
join:
; This call will get cloned; make sure we can handle cloning
; instructions with debug metadata attached.
call void @f(), !dbg !9
unreachable
exit:
ret void
}
; CHECK-LABEL: define void @test13()
; CHECK: ret void
define void @test13() personality i32 (...)* @__CxxFrameHandler3 {
entry:
ret void
unreachable:
cleanuppad []
unreachable
}
define void @test14() personality i32 (...)* @__CxxFrameHandler3 {
entry:
invoke void @f()
to label %exit unwind label %catch1.pad
catch1.pad:
%catch1 = catchpad [i32 1]
to label %catch1.body unwind label %catch2.pad
catch1.body:
invoke void @h(i32 1)
to label %catch1.body2 unwind label %catch.end
catch1.body2:
invoke void @f()
to label %catch1.ret unwind label %cleanup1.pad
cleanup1.pad:
%cleanup1 = cleanuppad []
call void @f()
cleanupret %cleanup1 unwind label %catch.end
catch1.ret:
catchret %catch1 to label %exit
catch2.pad:
%catch2 = catchpad [i32 2]
to label %catch2.body unwind label %catch.end
catch2.body:
invoke void @h(i32 2)
to label %catch2.body2 unwind label %catch.end
catch2.body2:
invoke void @f()
to label %catch2.ret unwind label %cleanup2.pad
cleanup2.pad:
%cleanup2 = cleanuppad []
call void @f()
cleanupret %cleanup2 unwind label %catch.end
catch2.ret:
catchret %catch2 to label %exit
catch.end:
catchendpad unwind to caller
exit:
ret void
}
; Make sure we don't clone the catchendpad even though the
; cleanupendpads targeting it would naively imply that it
; should get their respective parent colors (catch1 and catch2),
; as well as its properly getting the root function color. The
; references from the invokes ensure that if we did make clones
; for each catch, they'd be reachable, as those invokes would get
; rewritten
; CHECK-LABEL: define void @test14()
; CHECK-NOT: catchendpad
; CHECK: invoke void @h(i32 1)
; CHECK-NEXT: unwind label %catch.end
; CHECK-NOT: catchendpad
; CHECK: invoke void @h(i32 2)
; CHECK-NEXT: unwind label %catch.end
; CHECK-NOT: catchendpad
; CHECK: catch.end:
; CHECK-NEXT: catchendpad
; CHECK-NOT: catchendpad
;; Debug info (from test12)
; Make sure the DISubprogram doesn't get cloned
; CHECK-LABEL: !llvm.module.flags
; CHECK-NOT: !DISubprogram
; CHECK: !{{[0-9]+}} = distinct !DISubprogram(name: "test12"
; CHECK-NOT: !DISubprogram
!llvm.module.flags = !{!0}
!llvm.dbg.cu = !{!1}
!0 = !{i32 2, !"Debug Info Version", i32 3}
!1 = distinct !DICompileUnit(language: DW_LANG_C_plus_plus, file: !2, producer: "compiler", isOptimized: false, runtimeVersion: 0, emissionKind: 1, enums: !3, subprograms: !4)
!2 = !DIFile(filename: "test.cpp", directory: ".")
!3 = !{}
!4 = !{!5}
!5 = distinct !DISubprogram(name: "test12", scope: !2, file: !2, type: !6, isLocal: false, isDefinition: true, scopeLine: 3, flags: DIFlagPrototyped, isOptimized: true, function: void ()* @test12, variables: !3)
!6 = !DISubroutineType(types: !7)
!7 = !{null}
!8 = !DILocation(line: 1, scope: !5)
!9 = !DILocation(line: 2, scope: !5)