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471 lines
14 KiB
471 lines
14 KiB
; RUN: opt < %s -simplifycfg -S | FileCheck %s
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; ModuleID = 'cppeh-simplify.cpp'
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target datalayout = "e-m:w-i64:64-f80:128-n8:16:32:64-S128"
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target triple = "x86_64-pc-windows-msvc18.0.0"
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; This case arises when two objects with empty destructors are cleaned up.
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;
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; void f1() {
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; S a;
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; S b;
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; g();
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; }
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;
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; In this case, both cleanup pads can be eliminated and the invoke can be
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; converted to a call.
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;
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; CHECK: define void @f1()
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; CHECK: entry:
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; CHECK: call void @g()
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; CHECK: ret void
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; CHECK-NOT: cleanuppad
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; CHECK: }
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;
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define void @f1() personality i8* bitcast (i32 (...)* @__CxxFrameHandler3 to i8*) {
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entry:
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invoke void @g() to label %invoke.cont unwind label %ehcleanup
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invoke.cont: ; preds = %entry
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ret void
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ehcleanup: ; preds = %entry
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%0 = cleanuppad within none []
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cleanupret from %0 unwind label %ehcleanup.1
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ehcleanup.1: ; preds = %ehcleanup
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%1 = cleanuppad within none []
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cleanupret from %1 unwind to caller
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}
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; This case arises when an object with an empty destructor must be cleaned up
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; outside of a try-block and an object with a non-empty destructor must be
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; cleaned up within the try-block.
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;
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; void f2() {
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; S a;
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; try {
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; S2 b;
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; g();
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; } catch (...) {}
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; }
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;
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; In this case, the outermost cleanup pad can be eliminated and the catch block
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; should unwind to the caller (that is, exception handling continues with the
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; parent frame of the caller).
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;
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; CHECK: define void @f2()
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; CHECK: entry:
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; CHECK: invoke void @g()
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; CHECK: ehcleanup:
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; CHECK: cleanuppad within none
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; CHECK: call void @"\01??1S2@@QEAA@XZ"(%struct.S2* %b)
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; CHECK: cleanupret from %0 unwind label %catch.dispatch
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; CHECK: catch.dispatch:
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; CHECK: catchswitch within none [label %catch] unwind to caller
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; CHECK: catch:
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; CHECK: catchpad
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; CHECK: catchret
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; CHECK-NOT: cleanuppad
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; CHECK: }
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;
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define void @f2() personality i8* bitcast (i32 (...)* @__CxxFrameHandler3 to i8*) {
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entry:
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%b = alloca %struct.S2, align 1
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invoke void @g() to label %invoke.cont unwind label %ehcleanup
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invoke.cont: ; preds = %entry
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br label %try.cont
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ehcleanup: ; preds = %entry
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%0 = cleanuppad within none []
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call void @"\01??1S2@@QEAA@XZ"(%struct.S2* %b)
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cleanupret from %0 unwind label %catch.dispatch
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catch.dispatch: ; preds = %ehcleanup
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%cs1 = catchswitch within none [label %catch] unwind label %ehcleanup.1
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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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catchret from %1 to label %catchret.dest
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catchret.dest: ; preds = %catch
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br label %try.cont
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try.cont: ; preds = %catchret.dest, %invoke.cont
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ret void
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ehcleanup.1:
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%2 = cleanuppad within none []
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cleanupret from %2 unwind to caller
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}
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; This case arises when an object with a non-empty destructor must be cleaned up
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; outside of a try-block and an object with an empty destructor must be cleaned
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; within the try-block.
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;
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; void f3() {
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; S2 a;
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; try {
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; S b;
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; g();
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; } catch (...) {}
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; }
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;
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; In this case the inner cleanup pad should be eliminated and the invoke of g()
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; should unwind directly to the catchpad.
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;
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; CHECK-LABEL: define void @f3()
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; CHECK: entry:
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; CHECK: invoke void @g()
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; CHECK: to label %try.cont unwind label %catch.dispatch
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; CHECK: catch.dispatch:
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; CHECK-NEXT: catchswitch within none [label %catch] unwind label %ehcleanup.1
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; CHECK: catch:
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; CHECK: catchpad within %cs1 [i8* null, i32 64, i8* null]
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; CHECK: catchret
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; CHECK: ehcleanup.1:
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; CHECK: cleanuppad
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; CHECK: call void @"\01??1S2@@QEAA@XZ"(%struct.S2* %a)
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; CHECK: cleanupret from %cp3 unwind to caller
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; CHECK: }
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;
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define void @f3() personality i8* bitcast (i32 (...)* @__CxxFrameHandler3 to i8*) {
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entry:
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%a = alloca %struct.S2, align 1
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invoke void @g() to label %invoke.cont unwind label %ehcleanup
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invoke.cont: ; preds = %entry
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br label %try.cont
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ehcleanup: ; preds = %entry
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%0 = cleanuppad within none []
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cleanupret from %0 unwind label %catch.dispatch
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catch.dispatch: ; preds = %ehcleanup
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%cs1 = catchswitch within none [label %catch] unwind label %ehcleanup.1
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catch: ; preds = %catch.dispatch
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%cp2 = catchpad within %cs1 [i8* null, i32 u0x40, i8* null]
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catchret from %cp2 to label %catchret.dest
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catchret.dest: ; preds = %catch
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br label %try.cont
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try.cont: ; preds = %catchret.dest, %invoke.cont
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ret void
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ehcleanup.1:
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%cp3 = cleanuppad within none []
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call void @"\01??1S2@@QEAA@XZ"(%struct.S2* %a)
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cleanupret from %cp3 unwind to caller
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}
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; This case arises when an object with an empty destructor may require cleanup
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; from either inside or outside of a try-block.
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;
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; void f4() {
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; S a;
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; g();
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; try {
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; g();
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; } catch (...) {}
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; }
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;
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; In this case, the cleanuppad should be eliminated, the invoke outside of the
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; catch block should be converted to a call (that is, that is, exception
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; handling continues with the parent frame of the caller).)
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;
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; CHECK-LABEL: define void @f4()
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; CHECK: entry:
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; CHECK: call void @g
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; Note: The cleanuppad simplification will insert an unconditional branch here
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; but it will be eliminated, placing the following invoke in the entry BB.
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; CHECK: invoke void @g()
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; CHECK: to label %try.cont unwind label %catch.dispatch
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; CHECK: catch.dispatch:
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; CHECK: catchswitch within none [label %catch] unwind to caller
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; CHECK: catch:
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; CHECK: catchpad
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; CHECK: catchret
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; CHECK-NOT: cleanuppad
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; CHECK: }
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;
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define void @f4() personality i8* bitcast (i32 (...)* @__CxxFrameHandler3 to i8*) {
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entry:
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invoke void @g()
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to label %invoke.cont unwind label %ehcleanup
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invoke.cont: ; preds = %entry
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invoke void @g()
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to label %try.cont unwind label %catch.dispatch
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catch.dispatch: ; preds = %invoke.cont
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%cs1 = catchswitch within none [label %catch] unwind label %ehcleanup
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catch: ; preds = %catch.dispatch
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%0 = catchpad within %cs1 [i8* null, i32 u0x40, i8* null]
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catchret from %0 to label %try.cont
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try.cont: ; preds = %catch, %invoke.cont
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ret void
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ehcleanup:
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%cp2 = cleanuppad within none []
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cleanupret from %cp2 unwind to caller
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}
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; This case tests simplification of an otherwise empty cleanup pad that contains
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; a PHI node.
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;
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; int f6() {
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; int state = 1;
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; try {
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; S a;
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; g();
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; state = 2;
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; g();
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; } catch (...) {
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; return state;
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; }
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; return 0;
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; }
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;
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; In this case, the cleanup pad should be eliminated and the PHI node in the
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; cleanup pad should be sunk into the catch dispatch block.
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;
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; CHECK-LABEL: define i32 @f6()
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; CHECK: entry:
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; CHECK: invoke void @g()
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; CHECK: invoke.cont:
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; CHECK: invoke void @g()
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; CHECK-NOT: ehcleanup:
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; CHECK-NOT: cleanuppad
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; CHECK: catch.dispatch:
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; CHECK: %state.0 = phi i32 [ 2, %invoke.cont ], [ 1, %entry ]
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; CHECK: }
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define i32 @f6() personality i8* bitcast (i32 (...)* @__CxxFrameHandler3 to i8*) {
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entry:
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invoke void @g()
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to label %invoke.cont unwind label %ehcleanup
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invoke.cont: ; preds = %entry
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invoke void @g()
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to label %return unwind label %ehcleanup
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ehcleanup: ; preds = %invoke.cont, %entry
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%state.0 = phi i32 [ 2, %invoke.cont ], [ 1, %entry ]
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%0 = cleanuppad within none []
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cleanupret from %0 unwind label %catch.dispatch
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catch.dispatch: ; preds = %ehcleanup
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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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catchret from %1 to label %return
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return: ; preds = %invoke.cont, %catch
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%retval.0 = phi i32 [ %state.0, %catch ], [ 0, %invoke.cont ]
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ret i32 %retval.0
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}
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; This case tests another variation of simplification of an otherwise empty
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; cleanup pad that contains a PHI node.
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;
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; int f7() {
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; int state = 1;
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; try {
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; g();
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; state = 2;
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; S a;
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; g();
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; state = 3;
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; g();
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; } catch (...) {
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; return state;
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; }
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; return 0;
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; }
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;
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; In this case, the cleanup pad should be eliminated and the PHI node in the
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; cleanup pad should be merged with the PHI node in the catch dispatch block.
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;
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; CHECK-LABEL: define i32 @f7()
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; CHECK: entry:
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; CHECK: invoke void @g()
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; CHECK: invoke.cont:
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; CHECK: invoke void @g()
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; CHECK: invoke.cont.1:
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; CHECK: invoke void @g()
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; CHECK-NOT: ehcleanup:
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; CHECK-NOT: cleanuppad
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; CHECK: catch.dispatch:
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; CHECK: %state.1 = phi i32 [ 1, %entry ], [ 3, %invoke.cont.1 ], [ 2, %invoke.cont ]
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; CHECK: }
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define i32 @f7() personality i8* bitcast (i32 (...)* @__CxxFrameHandler3 to i8*) {
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entry:
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invoke void @g()
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to label %invoke.cont unwind label %catch.dispatch
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invoke.cont: ; preds = %entry
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invoke void @g()
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to label %invoke.cont.1 unwind label %ehcleanup
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invoke.cont.1: ; preds = %invoke.cont
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invoke void @g()
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to label %return unwind label %ehcleanup
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ehcleanup: ; preds = %invoke.cont.1, %invoke.cont
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%state.0 = phi i32 [ 3, %invoke.cont.1 ], [ 2, %invoke.cont ]
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%0 = cleanuppad within none []
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cleanupret from %0 unwind label %catch.dispatch
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catch.dispatch: ; preds = %ehcleanup, %entry
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%state.1 = phi i32 [ %state.0, %ehcleanup ], [ 1, %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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catchret from %1 to label %return
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return: ; preds = %invoke.cont.1, %catch
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%retval.0 = phi i32 [ %state.1, %catch ], [ 0, %invoke.cont.1 ]
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ret i32 %retval.0
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}
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; This case tests a scenario where an empty cleanup pad is not dominated by all
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; of the predecessors of its successor, but the successor references a PHI node
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; in the empty cleanup pad.
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;
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; Conceptually, the case being modeled is something like this:
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;
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; int f8() {
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; int x = 1;
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; try {
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; S a;
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; g();
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; x = 2;
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; retry:
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; g();
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; return
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; } catch (...) {
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; use_x(x);
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; }
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; goto retry;
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; }
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;
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; While that C++ syntax isn't legal, the IR below is.
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;
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; In this case, the PHI node that is sunk from ehcleanup to catch.dispatch
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; should have an incoming value entry for path from 'foo' that references the
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; PHI node itself.
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;
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; CHECK-LABEL: define void @f8()
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; CHECK: entry:
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; CHECK: invoke void @g()
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; CHECK: invoke.cont:
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; CHECK: invoke void @g()
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; CHECK-NOT: ehcleanup:
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; CHECK-NOT: cleanuppad
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; CHECK: catch.dispatch:
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; CHECK: %x = phi i32 [ 2, %invoke.cont ], [ 1, %entry ], [ %x, %catch.cont ]
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; CHECK: }
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define void @f8() personality i8* bitcast (i32 (...)* @__CxxFrameHandler3 to i8*) {
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entry:
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invoke void @g()
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to label %invoke.cont unwind label %ehcleanup
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invoke.cont: ; preds = %entry
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invoke void @g()
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to label %return unwind label %ehcleanup
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ehcleanup: ; preds = %invoke.cont, %entry
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%x = phi i32 [ 2, %invoke.cont ], [ 1, %entry ]
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%0 = cleanuppad within none []
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cleanupret from %0 unwind label %catch.dispatch
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catch.dispatch: ; preds = %ehcleanup, %catch.cont
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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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call void @use_x(i32 %x)
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catchret from %1 to label %catch.cont
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catch.cont: ; preds = %catch
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invoke void @g()
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to label %return unwind label %catch.dispatch
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return: ; preds = %invoke.cont, %catch.cont
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ret void
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}
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; CHECK-LABEL: define i32 @f9()
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; CHECK: entry:
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; CHECK: invoke void @"\01??1S2@@QEAA@XZ"(
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; CHECK-NOT: cleanuppad
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; CHECK: catch.dispatch:
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; CHECK: }
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define i32 @f9() personality i32 (...)* @__CxxFrameHandler3 {
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entry:
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%s = alloca i8, align 1
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call void @llvm.lifetime.start(i64 1, i8* nonnull %s)
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%bc = bitcast i8* %s to %struct.S2*
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invoke void @"\01??1S2@@QEAA@XZ"(%struct.S2* %bc)
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to label %try.cont unwind label %ehcleanup
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ehcleanup:
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%cleanup.pad = cleanuppad within none []
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call void @llvm.lifetime.end(i64 1, i8* nonnull %s)
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cleanupret from %cleanup.pad unwind label %catch.dispatch
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catch.dispatch:
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%catch.switch = catchswitch within none [label %catch] unwind to caller
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catch:
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%catch.pad = catchpad within %catch.switch [i8* null, i32 0, i8* null]
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catchret from %catch.pad to label %try.cont
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try.cont:
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ret i32 0
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}
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; CHECK-LABEL: define void @f10(
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define void @f10(i32 %V) personality i32 (...)* @__CxxFrameHandler3 {
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entry:
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invoke void @g()
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to label %unreachable unwind label %cleanup
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; CHECK: call void @g()
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; CHECK-NEXT: unreachable
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unreachable:
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unreachable
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cleanup:
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%cp = cleanuppad within none []
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switch i32 %V, label %cleanupret1 [
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i32 0, label %cleanupret2
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]
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cleanupret1:
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cleanupret from %cp unwind to caller
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cleanupret2:
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cleanupret from %cp unwind to caller
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}
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%struct.S = type { i8 }
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%struct.S2 = type { i8 }
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declare void @"\01??1S2@@QEAA@XZ"(%struct.S2*)
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declare void @g()
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declare void @use_x(i32 %x)
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declare i32 @__CxxFrameHandler3(...)
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declare void @llvm.lifetime.start(i64, i8* nocapture)
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declare void @llvm.lifetime.end(i64, i8* nocapture)
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