forked from OSchip/llvm-project
149 lines
3.4 KiB
C++
149 lines
3.4 KiB
C++
// RUN: %clang_cc1 -emit-llvm -O1 -o - %s | FileCheck %s
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// RUN: %clang_cc1 -emit-llvm -O1 -fcxx-exceptions -fexceptions -o - %s | FileCheck --check-prefix=CHECK-EH %s
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// Test code generation for the named return value optimization.
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class X {
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public:
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X();
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X(const X&);
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~X();
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};
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// CHECK: define void @_Z5test0v
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// CHECK-EH: define void @_Z5test0v
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X test0() {
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X x;
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// CHECK: call void @_ZN1XC1Ev
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// CHECK-NEXT: ret void
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// CHECK-EH: call void @_ZN1XC1Ev
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// CHECK-EH-NEXT: ret void
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return x;
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}
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// CHECK: define void @_Z5test1b(
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// CHECK-EH: define void @_Z5test1b(
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X test1(bool B) {
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// CHECK: tail call void @_ZN1XC1Ev
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// CHECK-NEXT: ret void
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X x;
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if (B)
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return (x);
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return x;
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// CHECK-EH: tail call void @_ZN1XC1Ev
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// CHECK-EH-NEXT: ret void
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}
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// CHECK: define void @_Z5test2b
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// CHECK-EH: define void @_Z5test2b
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X test2(bool B) {
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// No NRVO.
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X x;
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X y;
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if (B)
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return y;
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return x;
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// CHECK: call void @_ZN1XC1Ev
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// CHECK-NEXT: call void @_ZN1XC1Ev
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// CHECK: call void @_ZN1XC1ERKS_
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// CHECK: call void @_ZN1XC1ERKS_
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// CHECK: call void @_ZN1XD1Ev
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// CHECK: call void @_ZN1XD1Ev
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// CHECK: ret void
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// The block ordering in the -fexceptions IR is unfortunate.
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// CHECK-EH: call void @_ZN1XC1Ev
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// CHECK-EH-NEXT: invoke void @_ZN1XC1Ev
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// -> %invoke.cont, %lpad
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// %invoke.cont:
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// CHECK-EH: br i1
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// -> %if.then, %if.end
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// %if.then: returning 'x'
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// CHECK-EH: invoke void @_ZN1XC1ERKS_
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// -> %cleanup, %lpad1
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// %lpad: landing pad for ctor of 'y', dtor of 'y'
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// CHECK-EH: call i8* @llvm.eh.exception()
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// CHECK-EH: call i32 (i8*, i8*, ...)* @llvm.eh.selector
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// CHECK-EH-NEXT: br label
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// -> %eh.cleanup
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// %lpad1: landing pad for return copy ctors, EH cleanup for 'y'
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// CHECK-EH: invoke void @_ZN1XD1Ev
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// -> %eh.cleanup, %terminate.lpad
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// %if.end: returning 'y'
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// CHECK-EH: invoke void @_ZN1XC1ERKS_
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// -> %cleanup, %lpad1
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// %cleanup: normal cleanup for 'y'
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// CHECK-EH: invoke void @_ZN1XD1Ev
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// -> %invoke.cont11, %lpad
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// %invoke.cont11: normal cleanup for 'x'
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// CHECK-EH: call void @_ZN1XD1Ev
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// CHECK-EH-NEXT: ret void
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// %eh.cleanup: EH cleanup for 'x'
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// CHECK-EH: invoke void @_ZN1XD1Ev
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// -> %invoke.cont17, %terminate.lpad
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// %invoke.cont17: rethrow block for %eh.cleanup.
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// This really should be elsewhere in the function.
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// CHECK-EH: call void @_Unwind_Resume_or_Rethrow
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// CHECK-EH-NEXT: unreachable
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// %terminate.lpad: terminate landing pad.
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// CHECK-EH: call i8* @llvm.eh.exception()
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// CHECK-EH-NEXT: call i32 (i8*, i8*, ...)* @llvm.eh.selector
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// CHECK-EH-NEXT: call void @_ZSt9terminatev()
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// CHECK-EH-NEXT: unreachable
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}
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X test3(bool B) {
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// FIXME: We don't manage to apply NRVO here, although we could.
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{
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X y;
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return y;
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}
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X x;
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return x;
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}
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extern "C" void exit(int) throw();
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// CHECK: define void @_Z5test4b
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X test4(bool B) {
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{
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// CHECK: tail call void @_ZN1XC1Ev
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X x;
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// CHECK: br i1
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if (B)
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return x;
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}
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// CHECK: tail call void @_ZN1XD1Ev
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// CHECK: tail call void @exit(i32 1)
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exit(1);
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}
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#ifdef __EXCEPTIONS
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// CHECK-EH: define void @_Z5test5
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void may_throw();
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X test5() {
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try {
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may_throw();
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} catch (X x) {
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// CHECK-EH: invoke void @_ZN1XC1ERKS_
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// CHECK-EH: call void @__cxa_end_catch()
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// CHECK-EH: ret void
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return x;
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}
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}
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#endif
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