; RUN: opt -mtriple=x86_64-pc-windows-msvc -winehprepare -S -o - < %s | FileCheck %s ; This test describes two difficult cases in sinking allocas into child frames. ; We don't currently do this optimization, but we'll need to tweak these tests ; when we do. ; This test is based on the following code: ; ; // In this case we can sink the alloca from the parent into the catch because ; // the lifetime is limited to the catch. ; extern "C" void may_throw(); ; extern "C" void sink_alloca_to_catch() { ; try { ; may_throw(); ; } catch (int) { ; volatile int only_used_in_catch = 42; ; } ; } ; ; // In this case we cannot. The variable should live as long as the parent ; // frame lives. ; extern "C" void use_catch_var(int *); ; extern "C" void dont_sink_alloca_to_catch(int n) { ; int live_in_out_catch = 0; ; while (n > 0) { ; try { ; may_throw(); ; } catch (int) { ; use_catch_var(&live_in_out_catch); ; } ; n--; ; } ; } target datalayout = "e-m:w-i64:64-f80:128-n8:16:32:64-S128" target triple = "x86_64-pc-windows-msvc" declare void @may_throw() #1 declare i32 @__CxxFrameHandler3(...) declare i32 @llvm.eh.typeid.for(i8*) #2 declare void @llvm.eh.begincatch(i8* nocapture, i8* nocapture) #3 declare void @llvm.eh.endcatch() #3 %rtti.TypeDescriptor2 = type { i8**, i8*, [3 x i8] } %eh.CatchHandlerType = type { i32, i8* } $"\01??_R0H@8" = 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 @llvm.eh.handlertype.H.0 = private unnamed_addr constant %eh.CatchHandlerType { i32 0, i8* bitcast (%rtti.TypeDescriptor2* @"\01??_R0H@8" to i8*) }, section "llvm.metadata" ; Function Attrs: uwtable define void @sink_alloca_to_catch() #0 personality i8* bitcast (i32 (...)* @__CxxFrameHandler3 to i8*) { entry: %0 = alloca i32 %only_used_in_catch = alloca i32, align 4 invoke void @may_throw() to label %try.cont unwind label %lpad lpad: ; preds = %entry %1 = landingpad { i8*, i32 } catch %eh.CatchHandlerType* @llvm.eh.handlertype.H.0 %2 = extractvalue { i8*, i32 } %1, 1 %3 = tail call i32 @llvm.eh.typeid.for(i8* bitcast (%eh.CatchHandlerType* @llvm.eh.handlertype.H.0 to i8*)) #3 %matches = icmp eq i32 %2, %3 br i1 %matches, label %catch, label %eh.resume catch: ; preds = %lpad %4 = extractvalue { i8*, i32 } %1, 0 call void @llvm.eh.begincatch(i8* %4, i8* null) #3 store volatile i32 42, i32* %only_used_in_catch, align 4 tail call void @llvm.eh.endcatch() #3 br label %try.cont try.cont: ; preds = %entry, %catch ret void eh.resume: ; preds = %lpad resume { i8*, i32 } %1 } ; CHECK-LABEL: define void @sink_alloca_to_catch() ; CHECK: call void (...) @llvm.frameescape(i32* %only_used_in_catch) declare void @use_catch_var(i32*) #1 ; Function Attrs: uwtable define void @dont_sink_alloca_to_catch(i32 %n) #0 personality i8* bitcast (i32 (...)* @__CxxFrameHandler3 to i8*) { entry: %0 = alloca i32 %n.addr = alloca i32, align 4 %live_in_out_catch = alloca i32, align 4 %exn.slot = alloca i8* %ehselector.slot = alloca i32 store i32 %n, i32* %n.addr, align 4 br label %while.cond while.cond: ; preds = %try.cont, %entry %1 = load i32, i32* %n.addr, align 4 %cmp = icmp sgt i32 %1, 0 br i1 %cmp, label %while.body, label %while.end while.body: ; preds = %while.cond invoke void @may_throw() to label %invoke.cont unwind label %lpad invoke.cont: ; preds = %while.body br label %try.cont lpad: ; preds = %while.body %2 = landingpad { i8*, i32 } catch i8* bitcast (%eh.CatchHandlerType* @llvm.eh.handlertype.H.0 to i8*) %3 = extractvalue { i8*, i32 } %2, 0 store i8* %3, i8** %exn.slot %4 = extractvalue { i8*, i32 } %2, 1 store i32 %4, i32* %ehselector.slot br label %catch.dispatch catch.dispatch: ; preds = %lpad %sel = load i32, i32* %ehselector.slot %5 = call i32 @llvm.eh.typeid.for(i8* bitcast (%eh.CatchHandlerType* @llvm.eh.handlertype.H.0 to i8*)) #3 %matches = icmp eq i32 %sel, %5 br i1 %matches, label %catch, label %eh.resume catch: ; preds = %catch.dispatch %exn = load i8*, i8** %exn.slot call void @llvm.eh.begincatch(i8* %exn, i8* null) #3 invoke void @use_catch_var(i32* %live_in_out_catch) to label %invoke.cont2 unwind label %lpad1 invoke.cont2: ; preds = %catch call void @llvm.eh.endcatch() #3 br label %try.cont try.cont: ; preds = %invoke.cont2, %invoke.cont %6 = load i32, i32* %0 %7 = load i32, i32* %n.addr, align 4 %dec = add nsw i32 %7, -1 store i32 %dec, i32* %n.addr, align 4 br label %while.cond lpad1: ; preds = %catch %8 = landingpad { i8*, i32 } cleanup %9 = extractvalue { i8*, i32 } %8, 0 store i8* %9, i8** %exn.slot %10 = extractvalue { i8*, i32 } %8, 1 store i32 %10, i32* %ehselector.slot call void @llvm.eh.endcatch() #3 br label %eh.resume while.end: ; preds = %while.cond ret void eh.resume: ; preds = %lpad1, %catch.dispatch %exn3 = load i8*, i8** %exn.slot %sel4 = load i32, i32* %ehselector.slot %lpad.val = insertvalue { i8*, i32 } undef, i8* %exn3, 0 %lpad.val5 = insertvalue { i8*, i32 } %lpad.val, i32 %sel4, 1 resume { i8*, i32 } %lpad.val5 } ; CHECK-LABEL: define void @dont_sink_alloca_to_catch(i32 %n) ; CHECK: call void (...) @llvm.frameescape(i32* %live_in_out_catch) ; CHECK-LABEL: define internal i8* @sink_alloca_to_catch.catch(i8*, i8*) ; CHECK: %only_used_in_catch.i8 = call i8* @llvm.framerecover({{.*}}, i32 0) ; CHECK: %only_used_in_catch = bitcast ; CHECK-LABEL: define internal i8* @dont_sink_alloca_to_catch.catch(i8*, i8*) ; CHECK: %live_in_out_catch.i8 = call i8* @llvm.framerecover({{.*}}, i32 0) ; CHECK: %live_in_out_catch = bitcast attributes #0 = { uwtable "less-precise-fpmad"="false" "no-frame-pointer-elim"="false" "no-infs-fp-math"="false" "no-nans-fp-math"="false" "stack-protector-buffer-size"="8" "target-cpu"="x86-64" "unsafe-fp-math"="false" "use-soft-float"="false" } attributes #1 = { "less-precise-fpmad"="false" "no-frame-pointer-elim"="false" "no-infs-fp-math"="false" "no-nans-fp-math"="false" "stack-protector-buffer-size"="8" "target-cpu"="x86-64" "unsafe-fp-math"="false" "use-soft-float"="false" } attributes #2 = { nounwind readnone } attributes #3 = { nounwind }