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729fe8041c
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
47 lines
1.3 KiB
LLVM
47 lines
1.3 KiB
LLVM
; RUN: opt < %s -inline -S | FileCheck %s
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target datalayout = "e-m:e-p270:32:32-p271:32:32-p272:64:64-i64:64-f80:128-n8:16:32:64-S128"
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target triple = "x86_64-unknown-linux-gnu"
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@.str.2 = private unnamed_addr constant [7 x i8] c"Boom!\0A\00", align 1
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define dso_local void @trap() {
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entry:
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unreachable
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}
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define dso_local void @proxy() personality i8* bitcast (i32 (...)* @__gxx_personality_v0 to i8*) {
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entry:
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call void asm sideeffect unwind "call trap", "~{dirflag},~{fpsr},~{flags}"()
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call void asm sideeffect unwind "call trap", "~{dirflag},~{fpsr},~{flags}"()
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ret void
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}
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define dso_local void @test() personality i8* bitcast (i32 (...)* @__gxx_personality_v0 to i8*) {
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entry:
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; CHECK: define dso_local void @test
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; CHECK-NOT: invoke void @proxy()
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; CHECK: invoke void asm sideeffect unwind
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; CHECK: invoke void asm sideeffect unwind
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invoke void @proxy()
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to label %invoke.cont unwind label %lpad
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invoke.cont:
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ret void
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lpad:
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; CHECK: %0 = landingpad { i8*, i32 }
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; CHECK: resume { i8*, i32 } %0
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%0 = landingpad { i8*, i32 }
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cleanup
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call void (i8*, ...) @printf(i8* getelementptr inbounds ([7 x i8], [7 x i8]* @.str.2, i64 0, i64 0))
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resume { i8*, i32 } %0
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}
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declare dso_local i32 @__gxx_personality_v0(...)
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declare dso_local void @printf(i8*, ...)
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