18ff1ec3c3
As per LangRef's definition of `noreturn` attribute: ``` noreturn This function attribute indicates that the function never returns normally, hence through a return instruction. This produces undefined behavior at runtime if the function ever does dynamically return. nnotated functions may still raise an exception, i.a., nounwind is not implied. ``` So if we `invoke` a `noreturn` function, and the normal destination of an invoke is not an `unreachable`, point it at the new `unreachable` block. The change/fix from the original commit is that we now actually create the new block, and don't just repurpose the original block, because said normal destination block could have other users. This reverts commitdb1176ce66, relanding commit598833c987.
77 lines
1.9 KiB
LLVM
77 lines
1.9 KiB
LLVM
; RUN: llc < %s | FileCheck %s
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target datalayout = "e-m:w-i64:64-f80:128-n8:16:32:64-S128"
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target triple = "x86_64-pc-windows-msvc"
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declare i32 @__CxxFrameHandler3(...)
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declare void @throw() uwtable
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declare i8* @getval()
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declare void @llvm.trap()
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define i8* @reload_out_of_pad(i8* %arg) #0 personality i32 (...)* @__CxxFrameHandler3 {
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assertPassed:
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invoke void @throw()
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to label %unreachable unwind label %catch.dispatch
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catch:
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%cp = catchpad within %cs [i8* null, i32 0, i8* null]
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catchret from %cp to label %return
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; This block *must* appear after the catchret to test the bug.
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; FIXME: Make this an MIR test so we can control MBB layout.
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unreachable:
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call void @llvm.trap()
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unreachable
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catch.dispatch:
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%cs = catchswitch within none [label %catch] unwind to caller
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return:
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ret i8* %arg
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}
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; CHECK-LABEL: reload_out_of_pad: # @reload_out_of_pad
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; CHECK: movq %rcx, -[[arg_slot:[0-9]+]](%rbp) # 8-byte Spill
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; CHECK: callq throw
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; CHECK: ud2
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; CHECK: movq -[[arg_slot]](%rbp), %rax # 8-byte Reload
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; CHECK: retq
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; CHECK: "?catch${{[0-9]+}}@?0?reload_out_of_pad@4HA":
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; CHECK-NOT: Reload
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; CHECK: retq
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define i8* @spill_in_pad() #0 personality i32 (...)* @__CxxFrameHandler3 {
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assertPassed:
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invoke void @throw()
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to label %unreachable unwind label %catch.dispatch
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catch:
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%cp = catchpad within %cs [i8* null, i32 0, i8* null]
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%val = call i8* @getval() [ "funclet"(token %cp) ]
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catchret from %cp to label %return
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unreachable:
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call void @llvm.trap()
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unreachable
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catch.dispatch:
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%cs = catchswitch within none [label %catch] unwind to caller
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return:
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ret i8* %val
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}
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; CHECK-LABEL: spill_in_pad: # @spill_in_pad
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; CHECK: callq throw
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; CHECK: ud2
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; CHECK: movq -[[val_slot:[0-9]+]](%rbp), %rax # 8-byte Reload
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; CHECK: retq
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; CHECK: "?catch${{[0-9]+}}@?0?spill_in_pad@4HA":
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; CHECK: callq getval
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; CHECK: movq %rax, -[[val_slot]](%rbp) # 8-byte Spill
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; CHECK: retq
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attributes #0 = { uwtable }
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