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[SjLj Prepare] When demoting an invoke instructions to the stack, if the normal

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edge is critical, then split it so we can insert the store.
rdar://13126179

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@174418 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Chad Rosier 2013-02-05 18:23:10 +00:00
parent e6dc59891f
commit 1e45487dfd
2 changed files with 82 additions and 5 deletions
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20
lib/Transforms/Utils/DemoteRegToStack.cpp
View File

@ -7,6 +7,7 @@
//
//===----------------------------------------------------------------------===//
#include "llvm/Transforms/Utils/BasicBlockUtils.h"
#include "llvm/Transforms/Utils/Local.h"
#include "llvm/ADT/DenseMap.h"
#include "llvm/IR/Function.h"
@ -78,12 +79,21 @@ AllocaInst *llvm::DemoteRegToStack(Instruction &I, bool VolatileLoads,
InsertPt = &I;
++InsertPt;
} else {
// We cannot demote invoke instructions to the stack if their normal edge
// is critical.
InvokeInst &II = cast<InvokeInst>(I);
assert(II.getNormalDest()->getSinglePredecessor() &&
"Cannot demote invoke with a critical successor!");
InsertPt = II.getNormalDest()->begin();
if (II.getNormalDest()->getSinglePredecessor())
InsertPt = II.getNormalDest()->getFirstInsertionPt();
else {
// We cannot demote invoke instructions to the stack if their normal edge
// is critical. Therefore, split the critical edge and insert the store
// in the newly created basic block.
unsigned SuccNum = GetSuccessorNumber(I.getParent(), II.getNormalDest());
TerminatorInst *TI = &cast<TerminatorInst>(I);
assert (isCriticalEdge(TI, SuccNum) &&
"Expected a critical edge!");
BasicBlock *BB = SplitCriticalEdge(TI, SuccNum);
assert (BB && "Unable to split critical edge.");
InsertPt = BB->getFirstInsertionPt();
}
}
for (; isa<PHINode>(InsertPt) || isa<LandingPadInst>(InsertPt); ++InsertPt)

67
test/CodeGen/ARM/sjlj-prepare-critical-edge.ll Normal file
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@ -0,0 +1,67 @@
; RUN: llc < %s -O1 -mtriple thumbv7-apple-ios6
; Just make sure no one tries to make the assumption that the normal edge of an
; invoke is never a critical edge. Previously, this code would assert.
%struct.__CFString = type opaque
declare void @bar(%struct.__CFString*, %struct.__CFString*)
define noalias i8* @foo(i8* nocapture %inRefURL) noreturn ssp {
entry:
%call = tail call %struct.__CFString* @bar3()
%call2 = invoke i8* @bar2()
to label %for.cond unwind label %lpad
for.cond: ; preds = %entry, %for.cond
invoke void @bar(%struct.__CFString* undef, %struct.__CFString* null)
to label %for.cond unwind label %lpad5
lpad: ; preds = %entry
%0 = landingpad { i8*, i32 } personality i8* bitcast (i32 (...)* @__gxx_personality_sj0 to i8*)
cleanup
%1 = extractvalue { i8*, i32 } %0, 0
%2 = extractvalue { i8*, i32 } %0, 1
br label %ehcleanup
lpad5: ; preds = %for.cond
%3 = landingpad { i8*, i32 } personality i8* bitcast (i32 (...)* @__gxx_personality_sj0 to i8*)
cleanup
%4 = extractvalue { i8*, i32 } %3, 0
%5 = extractvalue { i8*, i32 } %3, 1
invoke void @release(i8* %call2)
to label %ehcleanup unwind label %terminate.lpad.i.i16
terminate.lpad.i.i16: ; preds = %lpad5
%6 = landingpad { i8*, i32 } personality i8* bitcast (i32 (...)* @__gxx_personality_sj0 to i8*)
catch i8* null
tail call void @terminatev() noreturn nounwind
unreachable
ehcleanup: ; preds = %lpad5, %lpad
%exn.slot.0 = phi i8* [ %1, %lpad ], [ %4, %lpad5 ]
%ehselector.slot.0 = phi i32 [ %2, %lpad ], [ %5, %lpad5 ]
%7 = bitcast %struct.__CFString* %call to i8*
invoke void @release(i8* %7)
to label %_ZN5SmartIPK10__CFStringED1Ev.exit unwind label %terminate.lpad.i.i
terminate.lpad.i.i: ; preds = %ehcleanup
%8 = landingpad { i8*, i32 } personality i8* bitcast (i32 (...)* @__gxx_personality_sj0 to i8*)
catch i8* null
tail call void @terminatev() noreturn nounwind
unreachable
_ZN5SmartIPK10__CFStringED1Ev.exit: ; preds = %ehcleanup
%lpad.val = insertvalue { i8*, i32 } undef, i8* %exn.slot.0, 0
%lpad.val12 = insertvalue { i8*, i32 } %lpad.val, i32 %ehselector.slot.0, 1
resume { i8*, i32 } %lpad.val12
}
declare %struct.__CFString* @bar3()
declare i8* @bar2()
declare i32 @__gxx_personality_sj0(...)
declare void @release(i8*)
declare void @terminatev()