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6ef34b9601
The UnwindHelp object is used during exception handling by runtime code. It must be findable from a fixed offset from FP. This change allocates the UnwindHelp object as a fixed object (as is done for x86_64) to ensure that both the generated code and runtime agree on the location of the object. Fixes https://bugs.llvm.org/show_bug.cgi?id=45346 Differential Revision: https://reviews.llvm.org/D77016
70 lines
2.0 KiB
LLVM
70 lines
2.0 KiB
LLVM
; RUN: llc -o - %s -mtriple=aarch64-windows | FileCheck %s
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; Check that we allocate the unwind help stack object in a fixed location from fp
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; so that the runtime can find it when handling an exception
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target datalayout = "e-m:w-p:64:64-i32:32-i64:64-i128:128-n32:64-S128"
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target triple = "aarch64-pc-windows-msvc19.25.28611"
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; Check that the store to the unwind help object for func2 is via FP
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; CHECK-LABEL: ?func2@@YAXXZ
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; CHECK: mov x[[#SCRATCH_REG:]], #-2
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; CHECK: stur x[[#SCRATCH_REG:]], [x29, #[[#]]]
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;
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; // struct that requires greater than stack alignment
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; struct alignas(32) A
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; {
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; // data that would be invalid for unwind help (> 0)
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; int _x[4]{42, 42, 42, 42};
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; ~A() {}
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; };
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;
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; // cause us to run the funclet in func2
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; void func3()
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; {
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; throw 1;
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; }
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;
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; // the funclet that ensures we have the unwind help correct
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; void func2()
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; {
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; A a;
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; func3();
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; }
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;
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; // function to ensure we are misaligned in func2
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; void func1()
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; {
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; func2();
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; }
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;
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; // set things up and ensure alignment for func1
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; void test()
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; {
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; try {
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; A a;
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; func1();
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; } catch(...) {}
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; }
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%struct.A = type { [4 x i32], [16 x i8] }
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declare dso_local %struct.A* @"??0A@@QEAA@XZ"(%struct.A* returned %0)
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declare dso_local void @"??1A@@QEAA@XZ"(%struct.A* %0)
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declare dso_local i32 @__CxxFrameHandler3(...)
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declare dso_local void @"?func3@@YAXXZ"()
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; Function Attrs: noinline optnone uwtable
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define dso_local void @"?func2@@YAXXZ"() #0 personality i8* bitcast (i32 (...)* @__CxxFrameHandler3 to i8*) {
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%1 = alloca %struct.A, align 32
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%2 = call %struct.A* @"??0A@@QEAA@XZ"(%struct.A* %1) #3
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invoke void @"?func3@@YAXXZ"()
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to label %3 unwind label %4
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3: ; preds = %0
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call void @"??1A@@QEAA@XZ"(%struct.A* %1) #3
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ret void
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4: ; preds = %0
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%5 = cleanuppad within none []
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call void @"??1A@@QEAA@XZ"(%struct.A* %1) #3 [ "funclet"(token %5) ]
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cleanupret from %5 unwind to caller
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}
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