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[WinEH] Handle a landingpad, resume, and cleanup all rolled into a BB

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This happens a lot with simple cleanups after SimplifyCFG.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@235117 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Reid Kleckner 2015-04-16 17:02:23 +00:00
parent d3557eb1f8
commit c4e7ecff42
2 changed files with 39 additions and 6 deletions
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10
lib/CodeGen/WinEHPrepare.cpp
View File

@ -1582,11 +1582,10 @@ void WinEHPrepare::findCleanupHandlers(LandingPadActions &Actions,
InsertValueInst *Insert1 = nullptr;
InsertValueInst *Insert2 = nullptr;
Value *ResumeVal = Resume->getOperand(0);
// If there is only one landingpad, we may use the lpad directly with no
// insertions.
if (isa<LandingPadInst>(ResumeVal))
return;
if (!isa<PHINode>(ResumeVal)) {
// If the resume value isn't a phi or landingpad value, it should be a
// series of insertions. Identify them so we can avoid them when scanning
// for cleanups.
if (!isa<PHINode>(ResumeVal) && !isa<LandingPadInst>(ResumeVal)) {
Insert2 = dyn_cast<InsertValueInst>(ResumeVal);
if (!Insert2)
return createCleanupHandler(Actions, CleanupHandlerMap, BB);
@ -1702,7 +1701,6 @@ void WinEHPrepare::findCleanupHandlers(LandingPadActions &Actions,
return;
BB = Branch->getSuccessor(0);
}
return;
}
// This is a public function, declared in WinEHFuncInfo.h and is also

35
test/CodeGen/WinEH/seh-inlined-finally.ll Normal file
View File

@ -0,0 +1,35 @@
; RUN: opt -S -winehprepare -sehprepare < %s | FileCheck %s
; Check that things work when the mid-level optimizer inlines the finally
; block.
target datalayout = "e-m:w-i64:64-f80:128-n8:16:32:64-S128"
target triple = "x86_64-pc-windows-msvc"
declare i32 @puts(i8*)
declare void @may_crash()
declare i32 @__C_specific_handler(...)
define void @use_finally() {
entry:
invoke void @may_crash()
to label %invoke.cont unwind label %lpad
invoke.cont: ; preds = %entry
%call.i = tail call i32 @puts(i8* null)
ret void
lpad: ; preds = %entry
%0 = landingpad { i8*, i32 } personality i8* bitcast (i32 (...)* @__C_specific_handler to i8*)
cleanup
%call.i2 = tail call i32 @puts(i8* null)
resume { i8*, i32 } %0
}
; CHECK-LABEL: define void @use_finally()
; CHECK: invoke void @may_crash()
;
; CHECK: landingpad
; CHECK-NEXT: cleanup
; CHECK-NEXT: call i8* (...)* @llvm.eh.actions(i32 0, void (i8*, i8*)* @use_finally.cleanup)
; CHECK-NEXT: indirectbr i8* %recover, []