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81eb2d6bae
32-bit x86 Windows targets use a linked-list of nodes allocated on the stack, referenced to via thread-local storage. The personality routine interprets one of the fields in the node as a 'state number' which indicates where the personality routine should transfer control. State transitions are possible only before call-sites which may throw exceptions. Our previous scheme had us update the state number before all call-sites which may throw. Instead, we can try to minimize the number of times we need to store by reasoning about the nearest store which dominates the current call-site. If the last store agrees with the current call-site, then we know that the state-update is redundant and can be elided. This is largely straightforward: an RPO walk of the blocks allows us to correctly forward propagate the information when the function is a DAG. Currently, loops are not handled optimally and may trigger superfluous state stores. Differential Revision: http://reviews.llvm.org/D16763 llvm-svn: 261122
220 lines
8.0 KiB
LLVM
220 lines
8.0 KiB
LLVM
; RUN: opt -mtriple=i686-pc-windows-msvc -S -x86-winehstate < %s | FileCheck %s
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target datalayout = "e-m:x-p:32:32-i64:64-f80:32-n8:16:32-a:0:32-S32"
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target triple = "i686-pc-windows-msvc"
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%rtti.TypeDescriptor2 = type { i8**, i8*, [3 x i8] }
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%eh.CatchableType = type { i32, i8*, i32, i32, i32, i32, i8* }
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%eh.CatchableTypeArray.1 = type { i32, [1 x %eh.CatchableType*] }
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%eh.ThrowInfo = type { i32, i8*, i8*, i8* }
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$"\01??_R0H@8" = comdat any
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$"_CT??_R0H@84" = comdat any
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$_CTA1H = comdat any
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$_TI1H = comdat any
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@"\01??_7type_info@@6B@" = external constant i8*
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@"\01??_R0H@8" = linkonce_odr global %rtti.TypeDescriptor2 { i8** @"\01??_7type_info@@6B@", i8* null, [3 x i8] c".H\00" }, comdat
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@"_CT??_R0H@84" = linkonce_odr unnamed_addr constant %eh.CatchableType { i32 1, i8* bitcast (%rtti.TypeDescriptor2* @"\01??_R0H@8" to i8*), i32 0, i32 -1, i32 0, i32 4, i8* null }, section ".xdata", comdat
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@_CTA1H = linkonce_odr unnamed_addr constant %eh.CatchableTypeArray.1 { i32 1, [1 x %eh.CatchableType*] [%eh.CatchableType* @"_CT??_R0H@84"] }, section ".xdata", comdat
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@_TI1H = linkonce_odr unnamed_addr constant %eh.ThrowInfo { i32 0, i8* null, i8* null, i8* bitcast (%eh.CatchableTypeArray.1* @_CTA1H to i8*) }, section ".xdata", comdat
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define i32 @main() #0 personality i32 (...)* @__CxxFrameHandler3 {
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entry:
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%tmp = alloca i32, align 4
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; CHECK: entry:
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; CHECK: store i32 -1
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; CHECK: call void @g(i32 3)
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; CHECK-NEXT: call void @g(i32 4)
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; CHECK-NEXT: call void @g(i32 5)
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call void @g(i32 3)
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call void @g(i32 4)
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call void @g(i32 5)
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store i32 0, i32* %tmp, align 4
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%0 = bitcast i32* %tmp to i8*
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; CHECK: store i32 0
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; CHECK: invoke void @_CxxThrowException(
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invoke void @_CxxThrowException(i8* %0, %eh.ThrowInfo* nonnull @_TI1H) #1
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to label %unreachable.for.entry unwind label %catch.dispatch
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catch.dispatch: ; preds = %entry
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%cs1 = catchswitch within none [label %catch] unwind to caller
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catch: ; preds = %catch.dispatch
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%1 = catchpad within %cs1 [i8* null, i32 u0x40, i8* null]
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; CHECK: catch:
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; CHECK: store i32 2
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; CHECK: invoke void @_CxxThrowException(
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invoke void @_CxxThrowException(i8* null, %eh.ThrowInfo* null) [ "funclet"(token %1) ]
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to label %unreachable unwind label %catch.dispatch.1
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catch.dispatch.1: ; preds = %catch
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%cs2 = catchswitch within %1 [label %catch.3] unwind to caller
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catch.3: ; preds = %catch.dispatch.1
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%2 = catchpad within %cs2 [i8* null, i32 u0x40, i8* null]
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; CHECK: catch.3:
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; CHECK: store i32 3
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; CHECK: call void @g(i32 1)
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; CHECK-NEXT: call void @g(i32 2)
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; CHECK-NEXT: call void @g(i32 3)
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call void @g(i32 1)
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call void @g(i32 2)
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call void @g(i32 3)
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catchret from %2 to label %try.cont
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try.cont: ; preds = %catch.3
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; CHECK: try.cont:
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; CHECK: store i32 1
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; CHECK: call void @g(i32 2)
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; CHECK-NEXT: call void @g(i32 3)
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; CHECK-NEXT: call void @g(i32 4)
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call void @g(i32 2)
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call void @g(i32 3)
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call void @g(i32 4)
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unreachable
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unreachable: ; preds = %catch
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unreachable
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unreachable.for.entry: ; preds = %entry
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unreachable
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}
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define i32 @nopads() #0 personality i32 (...)* @__CxxFrameHandler3 {
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ret i32 0
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}
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; CHECK-LABEL: define i32 @nopads()
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; CHECK-NEXT: ret i32 0
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; CHECK-NOT: __ehhandler$nopads
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; CHECK-LABEL: define void @PR25926()
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define void @PR25926() personality i32 (...)* @__CxxFrameHandler3 {
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entry:
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; CHECK: entry:
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; CHECK: store i32 -1
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; CHECK: store i32 0
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; CHECK: invoke void @_CxxThrowException(
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invoke void @_CxxThrowException(i8* null, %eh.ThrowInfo* null)
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to label %unreachable unwind label %catch.dispatch
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catch.dispatch: ; preds = %entry
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%0 = catchswitch within none [label %catch] unwind to caller
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catch: ; preds = %catch.dispatch
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%1 = catchpad within %0 [i8* null, i32 64, i8* null]
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; CHECK: catch:
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; CHECK: store i32 3
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; CHECK: invoke void @_CxxThrowException(
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invoke void @_CxxThrowException(i8* null, %eh.ThrowInfo* null) [ "funclet"(token %1) ]
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to label %unreachable1 unwind label %catch.dispatch1
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catch.dispatch1: ; preds = %catch
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%2 = catchswitch within %1 [label %catch2] unwind label %ehcleanup
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catch2: ; preds = %catch.dispatch1
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%3 = catchpad within %2 [i8* null, i32 64, i8* null]
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catchret from %3 to label %try.cont
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try.cont: ; preds = %catch2
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; CHECK: try.cont:
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; CHECK: store i32 1
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; CHECK: call void @dtor()
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; CHECK-NEXT: call void @dtor()
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; CHECK-NEXT: call void @dtor()
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call void @dtor() #3 [ "funclet"(token %1) ]
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call void @dtor() #3 [ "funclet"(token %1) ]
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call void @dtor() #3 [ "funclet"(token %1) ]
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catchret from %1 to label %try.cont4
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try.cont4: ; preds = %try.cont
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ret void
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ehcleanup: ; preds = %catch.dispatch1
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%4 = cleanuppad within %1 []
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; CHECK: ehcleanup:
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; CHECK: call void @dtor()
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call void @dtor() #3 [ "funclet"(token %4) ]
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cleanupret from %4 unwind to caller
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unreachable: ; preds = %entry
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unreachable
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unreachable1: ; preds = %catch
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unreachable
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}
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; CHECK-LABEL: define void @required_state_store(
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define void @required_state_store(i1 zeroext %cond) personality i32 (...)* @_except_handler3 {
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entry:
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%__exception_code = alloca i32, align 4
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call void (...) @llvm.localescape(i32* nonnull %__exception_code)
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; CHECK: store i32 -1
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; CHECK: call void @g(i32 0)
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call void @g(i32 0)
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br i1 %cond, label %if.then, label %if.end
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if.then: ; preds = %entry
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; CHECK: store i32 0
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; CHECK-NEXT: invoke void @g(i32 1)
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invoke void @g(i32 1)
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to label %if.end unwind label %catch.dispatch
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catch.dispatch: ; preds = %if.then
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%0 = catchswitch within none [label %__except.ret] unwind to caller
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__except.ret: ; preds = %catch.dispatch
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%1 = catchpad within %0 [i8* bitcast (i32 ()* @"\01?filt$0@0@required_state_store@@" to i8*)]
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catchret from %1 to label %if.end
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if.end: ; preds = %if.then, %__except.ret, %entry
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; CHECK: store i32 -1
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; CHECK-NEXT: call void @dtor()
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call void @dtor()
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ret void
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}
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define internal i32 @"\01?filt$0@0@required_state_store@@"() {
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entry:
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%0 = tail call i8* @llvm.frameaddress(i32 1)
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%1 = tail call i8* @llvm.x86.seh.recoverfp(i8* bitcast (void (i1)* @required_state_store to i8*), i8* %0)
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%2 = tail call i8* @llvm.localrecover(i8* bitcast (void (i1)* @required_state_store to i8*), i8* %1, i32 0)
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%__exception_code = bitcast i8* %2 to i32*
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%3 = getelementptr inbounds i8, i8* %0, i32 -20
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%4 = bitcast i8* %3 to { i32*, i8* }**
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%5 = load { i32*, i8* }*, { i32*, i8* }** %4, align 4
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%6 = getelementptr inbounds { i32*, i8* }, { i32*, i8* }* %5, i32 0, i32 0
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%7 = load i32*, i32** %6, align 4
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%8 = load i32, i32* %7, align 4
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store i32 %8, i32* %__exception_code, align 4
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ret i32 1
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}
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declare void @g(i32) #0
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declare void @dtor()
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declare x86_stdcallcc void @_CxxThrowException(i8*, %eh.ThrowInfo*)
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declare i32 @__CxxFrameHandler3(...)
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declare i8* @llvm.frameaddress(i32)
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declare i8* @llvm.x86.seh.recoverfp(i8*, i8*)
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declare i8* @llvm.localrecover(i8*, i8*, i32)
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declare void @llvm.localescape(...)
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declare i32 @_except_handler3(...)
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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" }
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attributes #1 = { noreturn }
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!llvm.ident = !{!0}
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!0 = !{!"clang version 3.8.0 (trunk 245153) (llvm/trunk 245238)"}
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