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[ARM64][Windows] Fix local stack size for funclets

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The comment was misplaced, and the code didn't do what the comment indicated,
namely ignoring the varargs portion when computing the local stack size of a
funclet in emitEpilogue.  This results in incorrect offset computations within
funclets that are contained in vararg functions.

Differential Revision: https://reviews.llvm.org/D55096

llvm-svn: 348222
This commit is contained in:
Sanjin Sijaric 2018-12-04 00:54:52 +00:00
parent 9251659358
commit 96650a3083
2 changed files with 61 additions and 3 deletions
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11
lib/Target/AArch64/AArch64FrameLowering.cpp
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@ -1289,12 +1289,17 @@ void AArch64FrameLowering::emitEpilogue(MachineFunction &MF,
bool IsWin64 =
Subtarget.isCallingConvWin64(MF.getFunction().getCallingConv());
unsigned FixedObject = IsWin64 ? alignTo(AFI->getVarArgsGPRSize(), 16) : 0;
// Var args are accounted for in the containing function, so don't
// include them for funclets.
unsigned FixedObject =
(IsWin64 && !IsFunclet) ? alignTo(AFI->getVarArgsGPRSize(), 16) : 0;
uint64_t AfterCSRPopSize = ArgumentPopSize;
auto PrologueSaveSize = AFI->getCalleeSavedStackSize() + FixedObject;
// Var args are accounted for in the containting function, so don't
// include them for funclets.
// We cannot rely on the local stack size set in emitPrologue if the function
// has funclets, as funclets have different local stack size requirements, and
// the current value set in emitPrologue may be that of the containing
// function.
if (MF.hasEHFunclets())
AFI->setLocalStackSize(NumBytes - PrologueSaveSize);
bool CombineSPBump = shouldCombineCSRLocalStackBump(MF, NumBytes);

53
test/CodeGen/AArch64/funclet-local-stack-size.ll Normal file
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@ -0,0 +1,53 @@
; RUN: llc -o - %s -mtriple=aarch64-windows | FileCheck %s
; Check that the local stack size is computed correctly for a funclet contained
; within a varargs function. The varargs component shouldn't be included in the
; local stack size computation.
target datalayout = "e-m:w-p:64:64-i32:32-i64:64-i128:128-n32:64-S128"
target triple = "aarch64-unknown-windows-msvc19.11.0"
%rtti.TypeDescriptor2 = type { i8**, i8*, [3 x i8] }
$"??_R0H@8" = comdat any
@"??_7type_info@@6B@" = external constant i8*
@"??_R0H@8" = linkonce_odr global %rtti.TypeDescriptor2 { i8** @"??_7type_info@@6B@", i8* null, [3 x i8] c".H\00" }, comdat
; CHECK-LABEL: ?catch$2@?0??func@@YAHHHZZ@4HA
; CHECK: stp x29, x30, [sp, #-16]!
; CHECK: ldp x29, x30, [sp], #16
; Function Attrs: uwtable
define dso_local i32 @"?func@@YAHHHZZ"(i32 %a, i32, ...) local_unnamed_addr #0 personality i8* bitcast (i32 (...)* @__CxxFrameHandler3 to i8*) {
entry:
%arr = alloca [10 x i32], align 4
%a2 = alloca i32, align 4
%1 = bitcast [10 x i32]* %arr to i8*
%arraydecay = getelementptr inbounds [10 x i32], [10 x i32]* %arr, i64 0, i64 0
%call = call i32 @"?init@@YAHPEAH@Z"(i32* nonnull %arraydecay)
%call1 = invoke i32 @"?func2@@YAHXZ"()
to label %cleanup unwind label %catch.dispatch
catch.dispatch: ; preds = %entry
%2 = catchswitch within none [label %catch] unwind to caller
catch: ; preds = %catch.dispatch
%3 = catchpad within %2 [%rtti.TypeDescriptor2* @"??_R0H@8", i32 0, i32* %a2]
%4 = load i32, i32* %a2, align 4
%add = add nsw i32 %4, 1
catchret from %3 to label %cleanup
cleanup: ; preds = %entry, %catch
%retval.0 = phi i32 [ %add, %catch ], [ %call1, %entry ]
ret i32 %retval.0
}
declare dso_local i32 @"?init@@YAHPEAH@Z"(i32*)
declare dso_local i32 @"?func2@@YAHXZ"()
declare dso_local i32 @__CxxFrameHandler3(...)
attributes #0 = { uwtable }
!llvm.module.flags = !{!0}
!0 = !{i32 1, !"wchar_size", i32 2}