1 files changed, 180 insertions, 0 deletions
diff --git a/test/CodeGen/WinEH/cppeh-alloca-sink.ll b/test/CodeGen/WinEH/cppeh-alloca-sink.ll
new file mode 100644
index 0000000..d50237f
--- /dev/null
+++ b/test/CodeGen/WinEH/cppeh-alloca-sink.ll
@@ -0,0 +1,180 @@
+; 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 {
+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 } personality i8* bitcast (i32 (...)* @__CxxFrameHandler3 to i8*)
+          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 {
+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 } personality i8* bitcast (i32 (...)* @__CxxFrameHandler3 to i8*)
+          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 } personality i8* bitcast (i32 (...)* @__CxxFrameHandler3 to i8*)
+          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 }