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feb8745705
Those commits created an artificial edge from a cleanup to a synthesized catchswitch in order to get the MSVC personality routine to execute cleanups which don't cleanupret and are not wrapped by a catchswitch. This worked well enough but is not a complete solution in situations where there the cleanup infinite loops. However, the real deal breaker behind this approach comes about from a degenerate case where the cleanup is post-dominated by unreachable *and* throws an exception. This ends poorly because the catchswitch will inadvertently catch the exception. Because of this we should go back to our previous behavior of not executing certain cleanups (identical behavior with the Itanium ABI implementation in clang, GCC and ICC). N.B. I think this could be salvaged by making the catchpad rethrow the exception and properly transforming throwing calls in the cleanup into invokes. llvm-svn: 259338
131 lines
2.6 KiB
LLVM
131 lines
2.6 KiB
LLVM
; RUN: opt -mtriple=x86_x64-pc-windows-msvc -S -winehprepare -disable-demotion -disable-cleanups < %s | FileCheck %s
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declare i32 @__CxxFrameHandler3(...)
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declare i32 @__C_specific_handler(...)
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declare void @f()
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declare i32 @g()
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declare void @h(i32)
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; CHECK-LABEL: @test1(
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define void @test1(i1 %bool) personality i32 (...)* @__C_specific_handler {
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entry:
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invoke void @f()
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to label %invoke.cont unwind label %left
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invoke.cont:
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invoke void @f()
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to label %exit unwind label %inner
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left:
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%0 = cleanuppad within none []
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br i1 %bool, label %shared, label %cleanupret
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cleanupret:
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cleanupret from %0 unwind label %right
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right:
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%1 = cleanuppad within none []
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br label %shared
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shared:
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%x = call i32 @g()
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invoke void @f()
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to label %shared.cont unwind label %inner
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shared.cont:
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unreachable
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inner:
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%phi = phi i32 [ %x, %shared ], [ 0, %invoke.cont ]
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%i = cleanuppad within none []
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call void @h(i32 %phi)
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unreachable
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; CHECK: %phi = phi i32 [ %x, %shared ], [ 0, %invoke.cont ], [ %x.for.left, %shared.for.left ]
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; CHECK: %i = cleanuppad within none []
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; CHECK: call void @h(i32 %phi)
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exit:
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unreachable
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}
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; CHECK-LABEL: @test2(
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define void @test2(i1 %bool) personality i32 (...)* @__C_specific_handler {
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entry:
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invoke void @f()
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to label %shared.cont unwind label %left
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left:
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%0 = cleanuppad within none []
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br i1 %bool, label %shared, label %cleanupret
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cleanupret:
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cleanupret from %0 unwind label %right
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right:
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%1 = cleanuppad within none []
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br label %shared
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shared:
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%x = call i32 @g()
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invoke void @f()
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to label %shared.cont unwind label %inner
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shared.cont:
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unreachable
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inner:
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%i = cleanuppad within none []
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call void @h(i32 %x)
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unreachable
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; CHECK: %x1 = phi i32 [ %x.for.left, %shared.for.left ], [ %x, %shared ]
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; CHECK: %i = cleanuppad within none []
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; CHECK: call void @h(i32 %x1)
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exit:
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unreachable
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}
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; CHECK-LABEL: @test4(
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define void @test4(i1 %x) personality i32 (...)* @__CxxFrameHandler3 {
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entry:
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invoke void @f()
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to label %invoke.cont1 unwind label %left
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invoke.cont1:
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invoke void @f()
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to label %exit unwind label %right
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left:
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%0 = cleanuppad within none []
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br label %shared
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right:
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%1 = cleanuppad within none []
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br i1 %x, label %shared, label %right.other
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right.other:
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br label %shared
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shared:
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%phi = phi i32 [ 1, %left ], [ 0, %right ], [ -1, %right.other ]
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call void @h(i32 %phi)
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unreachable
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; CHECK: %phi = phi i32 [ 0, %right ], [ -1, %right.other ]
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; CHECK: call void @h(i32 %phi)
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; CHECK: %phi.for.left = phi i32 [ 1, %left ]
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; CHECK: call void @h(i32 %phi.for.left)
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exit:
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unreachable
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}
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declare void @__std_terminate()
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