[WinEH] Run cleanup handlers when an exception is thrown

Generate tables in the .xdata section representing what actions to take
when an exception is thrown.  This currently fills in state for
cleanups, catch handlers are still unfinished.

llvm-svn: 233636

1 files changed, 226 insertions, 0 deletions

diff --git a/llvm/test/CodeGen/WinEH/cppeh-cleanups.ll b/llvm/test/CodeGen/WinEH/cppeh-cleanups.ll
new file mode 100644
index 00000000000..64d9980be39
--- /dev/null
+++ b/llvm/test/CodeGen/WinEH/cppeh-cleanups.ll
@@ -0,0 +1,226 @@
+; RUN: llc < %s | FileCheck %s
+
+target datalayout = "e-m:w-i64:64-f80:128-n8:16:32:64-S128"
+target triple = "x86_64-pc-windows-msvc"
+
+%rtti.TypeDescriptor2 = type { i8**, i8*, [3 x i8] }
+%eh.CatchableType = type { i32, i32, i32, i32, i32, i32, i32 }
+%eh.CatchableTypeArray.1 = type { i32, [1 x i32] }
+%eh.ThrowInfo = type { i32, i32, i32, i32 }
+%struct.S = type { i8 }
+
+$"\01??_DS@@QEAA@XZ" = comdat any
+
+$"\01??_R0H@8" = comdat any
+
+$"_CT??_R0H@84" = comdat any
+
+$_CTA1H = comdat any
+
+$_TI1H = comdat any
+
+@"\01??_7type_info@@6B@" = external constant i8*
+@"\01??_R0H@8" = linkonce_odr global %rtti.TypeDescriptor2 { i8** @"\01??_7type_info@@6B@", i8* null, [3 x i8] c".H\00" }, comdat
+@__ImageBase = external constant i8
+@"_CT??_R0H@84" = linkonce_odr unnamed_addr constant %eh.CatchableType { i32 1, i32 trunc (i64 sub nuw nsw (i64 ptrtoint (%rtti.TypeDescriptor2* @"\01??_R0H@8" to i64), i64 ptrtoint (i8* @__ImageBase to i64)) to i32), i32 0, i32 -1, i32 0, i32 4, i32 0 }, section ".xdata", comdat
+@_CTA1H = linkonce_odr unnamed_addr constant %eh.CatchableTypeArray.1 { i32 1, [1 x i32] [i32 trunc (i64 sub nuw nsw (i64 ptrtoint (%eh.CatchableType* @"_CT??_R0H@84" to i64), i64 ptrtoint (i8* @__ImageBase to i64)) to i32)] }, section ".xdata", comdat
+@_TI1H = linkonce_odr unnamed_addr constant %eh.ThrowInfo { i32 0, i32 0, i32 0, i32 trunc (i64 sub nuw nsw (i64 ptrtoint (%eh.CatchableTypeArray.1* @_CTA1H to i64), i64 ptrtoint (i8* @__ImageBase to i64)) to i32) }, section ".xdata", comdat
+
+
+; CHECK-LABEL: ?test1@@YAXXZ":
+; CHECK:             .seh_handlerdata
+; CHECK-NEXT:        .long   ("$cppxdata$?test1@@YAXXZ")@IMGREL
+; CHECK-NEXT:"$cppxdata$?test1@@YAXXZ":
+; CHECK-NEXT:        .long   429065506
+; CHECK-NEXT:        .long   1
+; CHECK-NEXT:        .long   ("$stateUnwindMap$?test1@@YAXXZ")@IMGREL
+; CHECK-NEXT:        .long   0
+; CHECK-NEXT:        .long   0
+; CHECK-NEXT:        .long   1
+; CHECK-NEXT:        .long   ("$ip2state$?test1@@YAXXZ")@IMGREL
+; CHECK-NEXT:        .long   64
+; CHECK-NEXT:        .long   0
+; CHECK-NEXT:        .long   1
+; CHECK-NEXT:"$stateUnwindMap$?test1@@YAXXZ":
+; CHECK-NEXT:        .long   -1
+; CHECK-NEXT:        .long   "?test1@@YAXXZ.cleanup"@IMGREL
+; CHECK-NEXT:"$ip2state$?test1@@YAXXZ":
+; CHECK-NEXT:        .long   .Ltmp0@IMGREL
+; CHECK-NEXT:        .long   0
+
+define void @"\01?test1@@YAXXZ"() #0 {
+entry:
+  %unwindhelp = alloca i64
+  %tmp = alloca i32, align 4
+  %exn.slot = alloca i8*
+  %ehselector.slot = alloca i32
+  store i32 0, i32* %tmp
+  %0 = bitcast i32* %tmp to i8*
+  call void (...)* @llvm.frameescape()
+  store volatile i64 -2, i64* %unwindhelp
+  %1 = bitcast i64* %unwindhelp to i8*
+  call void @llvm.eh.unwindhelp(i8* %1)
+  invoke void @_CxxThrowException(i8* %0, %eh.ThrowInfo* @_TI1H) #8
+          to label %unreachable unwind label %lpad1
+
+lpad1:                                            ; preds = %entry
+  %2 = landingpad { i8*, i32 } personality i8* bitcast (i32 (...)* @__CxxFrameHandler3 to i8*)
+          cleanup
+  %recover = call i8* (...)* @llvm.eh.actions(i32 0, void (i8*, i8*)* @"\01?test1@@YAXXZ.cleanup")
+  indirectbr i8* %recover, []
+
+unreachable:                                      ; preds = %entry
+  unreachable
+}
+
+declare void @_CxxThrowException(i8*, %eh.ThrowInfo*)
+
+declare i32 @__CxxFrameHandler3(...)
+
+; Function Attrs: nounwind
+define linkonce_odr void @"\01??_DS@@QEAA@XZ"(%struct.S* %this) unnamed_addr #1 comdat align 2 {
+entry:
+  %this.addr = alloca %struct.S*, align 8
+  store %struct.S* %this, %struct.S** %this.addr, align 8
+  %this1 = load %struct.S*, %struct.S** %this.addr
+  call void @"\01??1S@@QEAA@XZ"(%struct.S* %this1) #4
+  ret void
+}
+
+; CHECK-LABEL: "?test2@@YAX_N@Z":
+; CHECK:             .seh_handlerdata
+; CHECK-NEXT:        .long   ("$cppxdata$?test2@@YAX_N@Z")@IMGREL
+; CHECK-NEXT:"$cppxdata$?test2@@YAX_N@Z":
+; CHECK-NEXT:        .long   429065506
+; CHECK-NEXT:        .long   2
+; CHECK-NEXT:        .long   ("$stateUnwindMap$?test2@@YAX_N@Z")@IMGREL
+; CHECK-NEXT:        .long   0
+; CHECK-NEXT:        .long   0
+; CHECK-NEXT:        .long   4
+; CHECK-NEXT:        .long   ("$ip2state$?test2@@YAX_N@Z")@IMGREL
+; CHECK-NEXT:        .long   64
+; CHECK-NEXT:        .long   0
+; CHECK-NEXT:        .long   1
+; CHECK-NEXT:"$stateUnwindMap$?test2@@YAX_N@Z":
+; CHECK-NEXT:        .long   -1
+; CHECK-NEXT:        .long   "?test2@@YAX_N@Z.cleanup"@IMGREL
+; CHECK-NEXT:        .long   0
+; CHECK-NEXT:        .long   "?test2@@YAX_N@Z.cleanup1"@IMGREL
+; CHECK-NEXT:"$ip2state$?test2@@YAX_N@Z":
+; CHECK-NEXT:        .long   .Lfunc_begin1@IMGREL
+; CHECK-NEXT:        .long   -1
+; CHECK-NEXT:        .long   .Ltmp7@IMGREL
+; CHECK-NEXT:        .long   0
+; CHECK-NEXT:        .long   .Ltmp9@IMGREL
+; CHECK-NEXT:        .long   1
+; CHECK-NEXT:        .long   .Ltmp12@IMGREL
+; CHECK-NEXT:        .long   0
+
+define void @"\01?test2@@YAX_N@Z"(i1 zeroext %b) #2 {
+entry:
+  %unwindhelp = alloca i64
+  %b.addr = alloca i8, align 1
+  %s = alloca %struct.S, align 1
+  %exn.slot = alloca i8*
+  %ehselector.slot = alloca i32
+  %s1 = alloca %struct.S, align 1
+  %frombool = zext i1 %b to i8
+  store i8 %frombool, i8* %b.addr, align 1
+  call void @"\01?may_throw@@YAXXZ"()
+  call void (...)* @llvm.frameescape(%struct.S* %s, %struct.S* %s1)
+  store volatile i64 -2, i64* %unwindhelp
+  %0 = bitcast i64* %unwindhelp to i8*
+  call void @llvm.eh.unwindhelp(i8* %0)
+  invoke void @"\01?may_throw@@YAXXZ"()
+          to label %invoke.cont unwind label %lpad1
+
+invoke.cont:                                      ; preds = %entry
+  %1 = load i8, i8* %b.addr, align 1
+  %tobool = trunc i8 %1 to i1
+  br i1 %tobool, label %if.then, label %if.else
+
+if.then:                                          ; preds = %invoke.cont
+  invoke void @"\01?may_throw@@YAXXZ"()
+          to label %invoke.cont3 unwind label %lpad3
+
+invoke.cont3:                                     ; preds = %if.then
+  call void @"\01??_DS@@QEAA@XZ"(%struct.S* %s1) #4
+  br label %if.end
+
+lpad1:                                            ; preds = %entry, %if.end
+  %2 = landingpad { i8*, i32 } personality i8* bitcast (i32 (...)* @__CxxFrameHandler3 to i8*)
+          cleanup
+  %recover = call i8* (...)* @llvm.eh.actions(i32 0, void (i8*, i8*)* @"\01?test2@@YAX_N@Z.cleanup")
+  indirectbr i8* %recover, []
+
+lpad3:                                            ; preds = %if.then
+  %3 = landingpad { i8*, i32 } personality i8* bitcast (i32 (...)* @__CxxFrameHandler3 to i8*)
+          cleanup
+  %recover4 = call i8* (...)* @llvm.eh.actions(i32 0, void (i8*, i8*)* @"\01?test2@@YAX_N@Z.cleanup1", i32 0, void (i8*, i8*)* @"\01?test2@@YAX_N@Z.cleanup")
+  indirectbr i8* %recover4, []
+
+if.else:                                          ; preds = %invoke.cont
+  call void @"\01?dont_throw@@YAXXZ"() #4
+  br label %if.end
+
+if.end:                                           ; preds = %if.else, %invoke.cont3
+  invoke void @"\01?may_throw@@YAXXZ"()
+          to label %invoke.cont4 unwind label %lpad1
+
+invoke.cont4:                                     ; preds = %if.end
+  call void @"\01??_DS@@QEAA@XZ"(%struct.S* %s) #4
+  ret void
+}
+
+declare void @"\01?may_throw@@YAXXZ"() #3
+
+; Function Attrs: nounwind
+declare void @"\01?dont_throw@@YAXXZ"() #1
+
+; Function Attrs: nounwind
+declare void @"\01??1S@@QEAA@XZ"(%struct.S*) #1
+
+; Function Attrs: nounwind
+declare i8* @llvm.eh.actions(...) #4
+
+define internal void @"\01?test1@@YAXXZ.cleanup"(i8*, i8*) #5 {
+entry:
+  %s = alloca %struct.S, align 1
+  call void @"\01??_DS@@QEAA@XZ"(%struct.S* %s) #4
+  ret void
+}
+
+; Function Attrs: nounwind
+declare void @llvm.frameescape(...) #4
+
+; Function Attrs: nounwind readnone
+declare i8* @llvm.framerecover(i8*, i8*, i32) #6
+
+; Function Attrs: nounwind
+declare void @llvm.eh.unwindhelp(i8*) #4
+
+define internal void @"\01?test2@@YAX_N@Z.cleanup"(i8*, i8*) #7 {
+entry:
+  %s.i8 = call i8* @llvm.framerecover(i8* bitcast (void (i1)* @"\01?test2@@YAX_N@Z" to i8*), i8* %1, i32 0)
+  %s = bitcast i8* %s.i8 to %struct.S*
+  call void @"\01??_DS@@QEAA@XZ"(%struct.S* %s) #4
+  ret void
+}
+
+define internal void @"\01?test2@@YAX_N@Z.cleanup1"(i8*, i8*) #7 {
+entry:
+  %s1.i8 = call i8* @llvm.framerecover(i8* bitcast (void (i1)* @"\01?test2@@YAX_N@Z" to i8*), i8* %1, i32 1)
+  %s1 = bitcast i8* %s1.i8 to %struct.S*
+  call void @"\01??_DS@@QEAA@XZ"(%struct.S* %s1) #4
+  ret void
+}
+
+attributes #0 = { "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" "wineh-parent"="
?test1@@YAXXZ" }
+attributes #1 = { nounwind "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 #2 = { "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" "wineh-parent"="
?test2@@YAX_N@Z" }
+attributes #3 = { "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 #4 = { nounwind }
+attributes #5 = { "wineh-parent"="
?test1@@YAXXZ" }
+attributes #6 = { nounwind readnone }
+attributes #7 = { "wineh-parent"="
?test2@@YAX_N@Z" }
+attributes #8 = { noreturn }