8ec9fd4839
I've taken the following steps to add unwinding support from inline assembly:
1) Add a new `unwind` "attribute" (like `sideeffect`) to the asm syntax:
```
invoke void asm sideeffect unwind "call thrower", "~{dirflag},~{fpsr},~{flags}"()
to label %exit unwind label %uexit
```
2.) Add Bitcode writing/reading support + LLVM-IR parsing.
3.) Emit EHLabels around inline assembly lowering (SelectionDAGBuilder + GlobalISel) when `InlineAsm::canThrow` is enabled.
4.) Tweak InstCombineCalls/InlineFunction pass to not mark inline assembly "calls" as nounwind.
5.) Add clang support by introducing a new clobber: "unwind", which lower to the `canThrow` being enabled.
6.) Don't allow unwinding callbr.
Reviewed By: Amanieu
Differential Revision: https://reviews.llvm.org/D95745
64 lines
2.3 KiB
LLVM
64 lines
2.3 KiB
LLVM
; RUN: llc < %s | FileCheck %s
|
|
|
|
target datalayout = "e-m:w-p270:32:32-p271:32:32-p272:64:64-i64:64-f80:128-n8:16:32:64-S128"
|
|
target triple = "x86_64-pc-windows-msvc19.28.29914"
|
|
|
|
@str = private unnamed_addr constant [6 x i8] c"Boom!\00", align 1
|
|
|
|
define dso_local void @trap() {
|
|
entry:
|
|
unreachable
|
|
}
|
|
|
|
define dso_local void @test() personality i8* bitcast (i32 (...)* @__CxxFrameHandler3 to i8*) {
|
|
entry:
|
|
|
|
; CHECK-LABEL: .Ltmp0:
|
|
; CHECK: callq trap
|
|
; CHECK-LABEL: .Ltmp1:
|
|
|
|
invoke void asm sideeffect unwind "call trap", "~{dirflag},~{fpsr},~{flags}"()
|
|
to label %exit unwind label %except
|
|
|
|
exit:
|
|
ret void
|
|
|
|
except:
|
|
|
|
; CHECK-LABEL: "?dtor$2@?0?test@4HA":
|
|
; CHECK: callq printf
|
|
|
|
%0 = cleanuppad within none []
|
|
call void (i8*, ...) @printf(i8* getelementptr inbounds ([6 x i8], [6 x i8]* @str, i64 0, i64 0)) [ "funclet"(token %0) ]
|
|
cleanupret from %0 unwind to caller
|
|
}
|
|
|
|
declare dso_local i32 @__CxxFrameHandler3(...)
|
|
|
|
declare dso_local void @printf(i8*, ...)
|
|
|
|
; SEH Table
|
|
|
|
; CHECK-LABEL: $cppxdata$test:
|
|
; CHECK-NEXT: .long 429065506 # MagicNumber
|
|
; CHECK-NEXT: .long 1 # MaxState
|
|
; CHECK-NEXT: .long ($stateUnwindMap$test)@IMGREL # UnwindMap
|
|
; CHECK-NEXT: .long 0 # NumTryBlocks
|
|
; CHECK-NEXT: .long 0 # TryBlockMap
|
|
; CHECK-NEXT: .long 3 # IPMapEntries
|
|
; CHECK-NEXT: .long ($ip2state$test)@IMGREL # IPToStateXData
|
|
; CHECK-NEXT: .long 40 # UnwindHelp
|
|
; CHECK-NEXT: .long 0 # ESTypeList
|
|
; CHECK-NEXT: .long 1 # EHFlags
|
|
; CHECK-NEXT:$stateUnwindMap$test:
|
|
; CHECK-NEXT: .long -1 # ToState
|
|
; CHECK-NEXT: .long "?dtor$2@?0?test@4HA"@IMGREL # Action
|
|
; CHECK-NEXT:$ip2state$test:
|
|
; CHECK-NEXT: .long .Lfunc_begin0@IMGREL # IP
|
|
; CHECK-NEXT: .long -1 # ToState
|
|
; CHECK-NEXT: .long .Ltmp0@IMGREL+1 # IP
|
|
; CHECK-NEXT: .long 0 # ToState
|
|
; CHECK-NEXT: .long .Ltmp1@IMGREL+1 # IP
|
|
; CHECK-NEXT: .long -1 # ToState
|
|
|