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llvm-mirror/test/CodeGen/X86/win32-seh-catchpad.ll
David Majnemer ccf132c096 [WinEH] Create a separate MBB for funclet prologues 
Our current emission strategy is to emit the funclet prologue in the
CatchPad's normal destination.  This is problematic because
intra-funclet control flow to the normal destination is not erroneous
and results in us reevaluating the prologue if said control flow is
taken.

Instead, use the CatchPad's location for the funclet prologue.  This
correctly models our desire to have unwind edges evaluate the prologue
but edges to the normal destination result in typical control flow.

Differential Revision: http://reviews.llvm.org/D13424

llvm-svn: 249483
2015-10-06 23:31:59 +00:00

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; RUN: llc < %s | FileCheck %s
target datalayout = "e-m:x-p:32:32-i64:64-f80:32-n8:16:32-a:0:32-S32"
target triple = "i686-pc-windows-msvc"
define void @try_except() #0 personality i8* bitcast (i32 (...)* @_except_handler3 to i8*) {
entry:
%__exception_code = alloca i32, align 4
call void (...) @llvm.localescape(i32* %__exception_code)
invoke void @f(i32 1) #3
to label %invoke.cont unwind label %catch.dispatch
catch.dispatch: ; preds = %entry
%0 = catchpad [i8* bitcast (i32 ()* @try_except_filter_catchall to i8*)] to label %__except.ret unwind label %catchendblock
__except.ret: ; preds = %catch.dispatch
catchret %0 to label %__except
__except: ; preds = %__except.ret
call void @f(i32 2)
br label %__try.cont
__try.cont: ; preds = %__except, %invoke.cont
call void @f(i32 3)
ret void
catchendblock: ; preds = %catch.dispatch
catchendpad unwind to caller
invoke.cont: ; preds = %entry
br label %__try.cont
}
; CHECK-LABEL: _try_except:
; Store state #0
; CHECK: movl $0, -[[state:[0-9]+]](%ebp)
; CHECK: movl $1, (%esp)
; CHECK: calll _f
; CHECK: movl $-1, -[[state]](%ebp)
; CHECK: movl $3, (%esp)
; CHECK: calll _f
; CHECK: retl
; __except
; CHECK: movl $-1, -[[state]](%ebp)
; CHECK: movl $2, (%esp)
; CHECK: calll _f
; CHECK: .section .xdata,"dr"
; CHECK: L__ehtable$try_except:
; CHECK: .long -1
; CHECK: .long _try_except_filter_catchall
; CHECK: .long LBB0_1
define internal i32 @try_except_filter_catchall() #0 {
entry:
%0 = call i8* @llvm.frameaddress(i32 1)
%1 = call i8* @llvm.x86.seh.recoverfp(i8* bitcast (void ()* @try_except to i8*), i8* %0)
%2 = call i8* @llvm.localrecover(i8* bitcast (void ()* @try_except to i8*), i8* %1, i32 0)
%__exception_code = bitcast i8* %2 to i32*
%3 = getelementptr inbounds i8, i8* %0, i32 -20
%4 = bitcast i8* %3 to i8**
%5 = load i8*, i8** %4, align 4
%6 = bitcast i8* %5 to { i32*, i8* }*
%7 = getelementptr inbounds { i32*, i8* }, { i32*, i8* }* %6, i32 0, i32 0
%8 = load i32*, i32** %7, align 4
%9 = load i32, i32* %8, align 4
store i32 %9, i32* %__exception_code, align 4
ret i32 1
}
define void @nested_exceptions() #0 personality i8* bitcast (i32 (...)* @_except_handler3 to i8*) {
entry:
%__exception_code = alloca i32, align 4
call void (...) @llvm.localescape(i32* %__exception_code)
invoke void @crash() #3
to label %__try.cont unwind label %catch.dispatch
catch.dispatch: ; preds = %entry
%0 = catchpad [i8* bitcast (i32 ()* @nested_exceptions_filter_catchall to i8*)] to label %__except.ret unwind label %catchendblock
__except.ret: ; preds = %catch.dispatch
catchret %0 to label %__try.cont
__try.cont: ; preds = %entry, %__except.ret
invoke void @crash() #3
to label %__try.cont.9 unwind label %catch.dispatch.5
catch.dispatch.5: ; preds = %__try.cont
%1 = catchpad [i8* bitcast (i32 ()* @nested_exceptions_filter_catchall to i8*)] to label %__except.ret.7 unwind label %catchendblock.6
__except.ret.7: ; preds = %catch.dispatch.5
catchret %1 to label %__try.cont.9
__try.cont.9: ; preds = %__try.cont, %__except.ret.7
invoke void @crash() #3
to label %__try.cont.15 unwind label %catch.dispatch.11
catch.dispatch.11: ; preds = %catchendblock, %catchendblock.6, %__try.cont.9
%2 = catchpad [i8* bitcast (i32 ()* @nested_exceptions_filter_catchall to i8*)] to label %__except.ret.13 unwind label %catchendblock.12
__except.ret.13: ; preds = %catch.dispatch.11
catchret %2 to label %__try.cont.15
__try.cont.15: ; preds = %__try.cont.9, %__except.ret.13
invoke void @crash() #3
to label %__try.cont.35 unwind label %catch.dispatch.17
catch.dispatch.17: ; preds = %catchendblock.12, %__try.cont.15
%3 = catchpad [i8* bitcast (i32 ()* @nested_exceptions_filter_catchall to i8*)] to label %__except.ret.19 unwind label %catchendblock.18
__except.ret.19: ; preds = %catch.dispatch.17
catchret %3 to label %__except.20
__except.20: ; preds = %__except.ret.19
invoke void @crash() #3
to label %__try.cont.27 unwind label %catch.dispatch.23
catch.dispatch.23: ; preds = %__except.20
%4 = catchpad [i8* bitcast (i32 ()* @nested_exceptions_filter_catchall to i8*)] to label %__except.ret.25 unwind label %catchendblock.24
__except.ret.25: ; preds = %catch.dispatch.23
catchret %4 to label %__try.cont.27
__try.cont.27: ; preds = %__except.20, %__except.ret.25
invoke void @crash() #3
to label %__try.cont.35 unwind label %catch.dispatch.30
catch.dispatch.30: ; preds = %__try.cont.27
%5 = catchpad [i8* bitcast (i32 ()* @nested_exceptions_filter_catchall to i8*)] to label %__except.ret.32 unwind label %catchendblock.31
__except.ret.32: ; preds = %catch.dispatch.30
catchret %5 to label %__try.cont.35
__try.cont.35: ; preds = %__try.cont.15, %__try.cont.27, %__except.ret.32
ret void
catchendblock.31: ; preds = %catch.dispatch.30
catchendpad unwind to caller
catchendblock.24: ; preds = %catch.dispatch.23
catchendpad unwind to caller
catchendblock.18: ; preds = %catch.dispatch.17
catchendpad unwind to caller
catchendblock.12: ; preds = %catch.dispatch.11
catchendpad unwind label %catch.dispatch.17
catchendblock.6: ; preds = %catch.dispatch.5
catchendpad unwind label %catch.dispatch.11
catchendblock: ; preds = %catch.dispatch
catchendpad unwind label %catch.dispatch.11
}
; This table is equivalent to the one produced by MSVC, even if it isn't in
; quite the same order.
; CHECK-LABEL: _nested_exceptions:
; CHECK: L__ehtable$nested_exceptions:
; CHECK: .long -1
; CHECK: .long _nested_exceptions_filter_catchall
; CHECK: .long LBB
; CHECK: .long -1
; CHECK: .long _nested_exceptions_filter_catchall
; CHECK: .long LBB
; CHECK: .long -1
; CHECK: .long _nested_exceptions_filter_catchall
; CHECK: .long LBB
; CHECK: .long 2
; CHECK: .long _nested_exceptions_filter_catchall
; CHECK: .long LBB
; CHECK: .long 3
; CHECK: .long _nested_exceptions_filter_catchall
; CHECK: .long LBB
; CHECK: .long 3
; CHECK: .long _nested_exceptions_filter_catchall
; CHECK: .long LBB
declare void @crash() #0
define internal i32 @nested_exceptions_filter_catchall() #0 {
entry:
%0 = call i8* @llvm.frameaddress(i32 1)
%1 = call i8* @llvm.x86.seh.recoverfp(i8* bitcast (void ()* @nested_exceptions to i8*), i8* %0)
%2 = call i8* @llvm.localrecover(i8* bitcast (void ()* @nested_exceptions to i8*), i8* %1, i32 0)
%__exception_code3 = bitcast i8* %2 to i32*
%3 = getelementptr inbounds i8, i8* %0, i32 -20
%4 = bitcast i8* %3 to i8**
%5 = load i8*, i8** %4, align 4
%6 = bitcast i8* %5 to { i32*, i8* }*
%7 = getelementptr inbounds { i32*, i8* }, { i32*, i8* }* %6, i32 0, i32 0
%8 = load i32*, i32** %7, align 4
%9 = load i32, i32* %8, align 4
store i32 %9, i32* %__exception_code3, align 4
ret i32 1
}
define void @code_in_catchpad() #0 personality i8* bitcast (i32 (...)* @_except_handler3 to i8*) {
entry:
invoke void @f(i32 1) #3
to label %__except unwind label %catch.dispatch
catch.dispatch: ; preds = %entry
%0 = catchpad [i8* bitcast (i32 ()* @try_except_filter_catchall to i8*)] to label %__except.ret unwind label %catchendblock
__except.ret: ; preds = %catch.dispatch
call void @f(i32 2)
catchret %0 to label %__except
__except:
ret void
catchendblock: ; preds = %catch.dispatch
catchendpad unwind to caller
}
; CHECK-LABEL: _code_in_catchpad:
; CHECK: # %catch.dispatch
; CHECK-NEXT: movl -24(%ebp), %esp
; CHECK-NEXT: addl $12, %ebp
; CHECK: # %__except.ret
; CHECK-NEXT: movl $-1, -16(%ebp)
; CHECK-NEXT: movl $2, (%esp)
; CHECK-NEXT: calll _f
; Function Attrs: nounwind readnone
declare i8* @llvm.frameaddress(i32) #1
; Function Attrs: nounwind readnone
declare i8* @llvm.x86.seh.recoverfp(i8*, i8*) #1
; Function Attrs: nounwind readnone
declare i8* @llvm.localrecover(i8*, i8*, i32) #1
declare void @f(i32) #0
declare i32 @_except_handler3(...)
; Function Attrs: nounwind
declare void @llvm.localescape(...) #2
attributes #0 = { "disable-tail-calls"="false" "less-precise-fpmad"="false" "no-frame-pointer-elim"="false" "no-infs-fp-math"="false" "no-nans-fp-math"="false" "no-realign-stack" "stack-protector-buffer-size"="8" "unsafe-fp-math"="false" "use-soft-float"="false" }
attributes #1 = { nounwind readnone }
attributes #2 = { nounwind }
attributes #3 = { noinline }
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