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llvm-project/clang/test/CodeGenCXX/trivial_abi.cpp
Akira Hatanaka 02914dc127 Add support for attribute 'trivial_abi'. 
The 'trivial_abi' attribute can be applied to a C++ class, struct, or
union. It makes special functions of the annotated class (the destructor
and copy/move constructors) to be trivial for the purpose of calls and,
as a result, enables the annotated class or containing classes to be
passed or returned using the C ABI for the underlying type.

When a type that is considered trivial for the purpose of calls despite
having a non-trivial destructor (which happens only when the class type
or one of its subobjects is a 'trivial_abi' class) is passed to a
function, the callee is responsible for destroying the object.

For more background, see the discussions that took place on the mailing
list:

http://lists.llvm.org/pipermail/cfe-dev/2017-November/055955.html
http://lists.llvm.org/pipermail/cfe-commits/Week-of-Mon-20180101/thread.html#214043

rdar://problem/35204524

Differential Revision: https://reviews.llvm.org/D41039

llvm-svn: 324269
2018-02-05 20:23:22 +00:00

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// RUN: %clang_cc1 -triple arm64-apple-ios11 -std=c++11 -fcxx-exceptions -fexceptions -emit-llvm -o - %s | FileCheck %s
// RUN: %clang_cc1 -triple arm64-apple-ios11 -std=c++11 -fcxx-exceptions -fexceptions -fclang-abi-compat=4.0 -emit-llvm -o - %s | FileCheck %s
// CHECK: %[[STRUCT_SMALL:.*]] = type { i32* }
// CHECK: %[[STRUCT_LARGE:.*]] = type { i32*, [128 x i32] }
// CHECK: %[[STRUCT_TRIVIAL:.*]] = type { i32 }
// CHECK: %[[STRUCT_NONTRIVIAL:.*]] = type { i32 }
struct __attribute__((trivial_abi)) Small {
int *p;
Small();
~Small();
Small(const Small &) noexcept;
Small &operator=(const Small &);
};
struct __attribute__((trivial_abi)) Large {
int *p;
int a[128];
Large();
~Large();
Large(const Large &) noexcept;
Large &operator=(const Large &);
};
struct Trivial {
int a;
};
struct NonTrivial {
NonTrivial();
~NonTrivial();
int a;
};
struct HasTrivial {
Small s;
Trivial m;
};
struct HasNonTrivial {
Small s;
NonTrivial m;
};
// CHECK: define void @_Z14testParamSmall5Small(i64 %[[A_COERCE:.*]])
// CHECK: %[[A:.*]] = alloca %[[STRUCT_SMALL]], align 8
// CHECK: %[[COERCE_DIVE:.*]] = getelementptr inbounds %[[STRUCT_SMALL]], %[[STRUCT_SMALL]]* %[[A]], i32 0, i32 0
// CHECK: %[[COERCE_VAL_IP:.*]] = inttoptr i64 %[[A_COERCE]] to i32*
// CHECK: store i32* %[[COERCE_VAL_IP]], i32** %[[COERCE_DIVE]], align 8
// CHECK: %[[CALL:.*]] = call %[[STRUCT_SMALL]]* @_ZN5SmallD1Ev(%[[STRUCT_SMALL]]* %[[A]])
// CHECK: ret void
// CHECK: }
void testParamSmall(Small a) noexcept {
}
// CHECK: define i64 @_Z15testReturnSmallv()
// CHECK: %[[RETVAL:.*]] = alloca %[[STRUCT_SMALL:.*]], align 8
// CHECK: %[[CALL:.*]] = call %[[STRUCT_SMALL]]* @_ZN5SmallC1Ev(%[[STRUCT_SMALL]]* %[[RETVAL]])
// CHECK: %[[COERCE_DIVE:.*]] = getelementptr inbounds %[[STRUCT_SMALL]], %[[STRUCT_SMALL]]* %[[RETVAL]], i32 0, i32 0
// CHECK: %[[V0:.*]] = load i32*, i32** %[[COERCE_DIVE]], align 8
// CHECK: %[[COERCE_VAL_PI:.*]] = ptrtoint i32* %[[V0]] to i64
// CHECK: ret i64 %[[COERCE_VAL_PI]]
// CHECK: }
Small testReturnSmall() {
Small t;
return t;
}
// CHECK: define void @_Z14testCallSmall0v()
// CHECK: %[[T:.*]] = alloca %[[STRUCT_SMALL:.*]], align 8
// CHECK: %[[AGG_TMP:.*]] = alloca %[[STRUCT_SMALL]], align 8
// CHECK: %[[CALL:.*]] = call %[[STRUCT_SMALL]]* @_ZN5SmallC1Ev(%[[STRUCT_SMALL]]* %[[T]])
// CHECK: %[[CALL1:.*]] = call %[[STRUCT_SMALL]]* @_ZN5SmallC1ERKS_(%[[STRUCT_SMALL]]* %[[AGG_TMP]], %[[STRUCT_SMALL]]* dereferenceable(8) %[[T]])
// CHECK: %[[COERCE_DIVE:.*]] = getelementptr inbounds %[[STRUCT_SMALL]], %[[STRUCT_SMALL]]* %[[AGG_TMP]], i32 0, i32 0
// CHECK: %[[V0:.*]] = load i32*, i32** %[[COERCE_DIVE]], align 8
// CHECK: %[[COERCE_VAL_PI:.*]] = ptrtoint i32* %[[V0]] to i64
// CHECK: call void @_Z14testParamSmall5Small(i64 %[[COERCE_VAL_PI]])
// CHECK: %[[CALL2:.*]] = call %[[STRUCT_SMALL]]* @_ZN5SmallD1Ev(%[[STRUCT_SMALL]]* %[[T]])
// CHECK: ret void
// CHECK: }
void testCallSmall0() {
Small t;
testParamSmall(t);
}
// CHECK: define void @_Z14testCallSmall1v()
// CHECK: %[[AGG_TMP:.*]] = alloca %[[STRUCT_SMALL:.*]], align 8
// CHECK: %[[CALL:.*]] = call i64 @_Z15testReturnSmallv()
// CHECK: %[[COERCE_DIVE:.*]] = getelementptr inbounds %[[STRUCT_SMALL]], %[[STRUCT_SMALL]]* %[[AGG_TMP]], i32 0, i32 0
// CHECK: %[[COERCE_VAL_IP:.*]] = inttoptr i64 %[[CALL]] to i32*
// CHECK: store i32* %[[COERCE_VAL_IP]], i32** %[[COERCE_DIVE]], align 8
// CHECK: %[[COERCE_DIVE1:.*]] = getelementptr inbounds %[[STRUCT_SMALL]], %[[STRUCT_SMALL]]* %[[AGG_TMP]], i32 0, i32 0
// CHECK: %[[V0:.*]] = load i32*, i32** %[[COERCE_DIVE1]], align 8
// CHECK: %[[COERCE_VAL_PI:.*]] = ptrtoint i32* %[[V0]] to i64
// CHECK: call void @_Z14testParamSmall5Small(i64 %[[COERCE_VAL_PI]])
// CHECK: ret void
// CHECK: }
void testCallSmall1() {
testParamSmall(testReturnSmall());
}
// CHECK: define void @_Z16testIgnoredSmallv()
// CHECK: %[[AGG_TMP_ENSURED:.*]] = alloca %[[STRUCT_SMALL:.*]], align 8
// CHECK: %[[CALL:.*]] = call i64 @_Z15testReturnSmallv()
// CHECK: %[[COERCE_DIVE:.*]] = getelementptr inbounds %[[STRUCT_SMALL]], %[[STRUCT_SMALL]]* %[[AGG_TMP_ENSURED]], i32 0, i32 0
// CHECK: %[[COERCE_VAL_IP:.*]] = inttoptr i64 %[[CALL]] to i32*
// CHECK: store i32* %[[COERCE_VAL_IP]], i32** %[[COERCE_DIVE]], align 8
// CHECK: %[[CALL1:.*]] = call %[[STRUCT_SMALL]]* @_ZN5SmallD1Ev(%[[STRUCT_SMALL]]* %[[AGG_TMP_ENSURED]])
// CHECK: ret void
// CHECK: }
void testIgnoredSmall() {
testReturnSmall();
}
// CHECK: define void @_Z14testParamLarge5Large(%[[STRUCT_LARGE:.*]]* %[[A:.*]])
// CHECK: %[[CALL:.*]] = call %[[STRUCT_LARGE]]* @_ZN5LargeD1Ev(%[[STRUCT_LARGE]]* %[[A]])
// CHECK: ret void
// CHECK: }
void testParamLarge(Large a) noexcept {
}
// CHECK: define void @_Z15testReturnLargev(%[[STRUCT_LARGE:.*]]* noalias sret %[[AGG_RESULT:.*]])
// CHECK: %[[CALL:.*]] = call %[[STRUCT_LARGE]]* @_ZN5LargeC1Ev(%[[STRUCT_LARGE]]* %[[AGG_RESULT]])
// CHECK: ret void
// CHECK: }
Large testReturnLarge() {
Large t;
return t;
}
// CHECK: define void @_Z14testCallLarge0v()
// CHECK: %[[T:.*]] = alloca %[[STRUCT_LARGE:.*]], align 8
// CHECK: %[[AGG_TMP:.*]] = alloca %[[STRUCT_LARGE]], align 8
// CHECK: %[[CALL:.*]] = call %[[STRUCT_LARGE]]* @_ZN5LargeC1Ev(%[[STRUCT_LARGE]]* %[[T]])
// CHECK: %[[CALL1:.*]] = call %[[STRUCT_LARGE]]* @_ZN5LargeC1ERKS_(%[[STRUCT_LARGE]]* %[[AGG_TMP]], %[[STRUCT_LARGE]]* dereferenceable(520) %[[T]])
// CHECK: call void @_Z14testParamLarge5Large(%[[STRUCT_LARGE]]* %[[AGG_TMP]])
// CHECK: %[[CALL2:.*]] = call %[[STRUCT_LARGE]]* @_ZN5LargeD1Ev(%[[STRUCT_LARGE]]* %[[T]])
// CHECK: ret void
// CHECK: }
void testCallLarge0() {
Large t;
testParamLarge(t);
}
// CHECK: define void @_Z14testCallLarge1v()
// CHECK: %[[AGG_TMP:.*]] = alloca %[[STRUCT_LARGE:.*]], align 8
// CHECK: call void @_Z15testReturnLargev(%[[STRUCT_LARGE]]* sret %[[AGG_TMP]])
// CHECK: call void @_Z14testParamLarge5Large(%[[STRUCT_LARGE]]* %[[AGG_TMP]])
// CHECK: ret void
// CHECK: }
void testCallLarge1() {
testParamLarge(testReturnLarge());
}
// CHECK: define void @_Z16testIgnoredLargev()
// CHECK: %[[AGG_TMP_ENSURED:.*]] = alloca %[[STRUCT_LARGE:.*]], align 8
// CHECK: call void @_Z15testReturnLargev(%[[STRUCT_LARGE]]* sret %[[AGG_TMP_ENSURED]])
// CHECK: %[[CALL:.*]] = call %[[STRUCT_LARGE]]* @_ZN5LargeD1Ev(%[[STRUCT_LARGE]]* %[[AGG_TMP_ENSURED]])
// CHECK: ret void
// CHECK: }
void testIgnoredLarge() {
testReturnLarge();
}
// CHECK: define i64 @_Z20testReturnHasTrivialv()
// CHECK: %[[RETVAL:.*]] = alloca %[[STRUCT_TRIVIAL:.*]], align 4
// CHECK: %[[COERCE_DIVE:.*]] = getelementptr inbounds %[[STRUCT_TRIVIAL]], %[[STRUCT_TRIVIAL]]* %[[RETVAL]], i32 0, i32 0
// CHECK: %[[V0:.*]] = load i32, i32* %[[COERCE_DIVE]], align 4
// CHECK: %[[COERCE_VAL_II:.*]] = zext i32 %[[V0]] to i64
// CHECK: ret i64 %[[COERCE_VAL_II]]
// CHECK: }
Trivial testReturnHasTrivial() {
Trivial t;
return t;
}
// CHECK: define void @_Z23testReturnHasNonTrivialv(%[[STRUCT_NONTRIVIAL:.*]]* noalias sret %[[AGG_RESULT:.*]])
// CHECK: %[[CALL:.*]] = call %[[STRUCT_NONTRIVIAL]]* @_ZN10NonTrivialC1Ev(%[[STRUCT_NONTRIVIAL]]* %[[AGG_RESULT]])
// CHECK: ret void
// CHECK: }
NonTrivial testReturnHasNonTrivial() {
NonTrivial t;
return t;
}
// CHECK: define void @_Z18testExceptionSmallv()
// CHECK: %[[AGG_TMP:.*]] = alloca %[[STRUCT_SMALL]], align 8
// CHECK: %[[AGG_TMP1:.*]] = alloca %[[STRUCT_SMALL]], align 8
// CHECK: call %[[STRUCT_SMALL]]* @_ZN5SmallC1Ev(%[[STRUCT_SMALL]]* %[[AGG_TMP]])
// CHECK: invoke %[[STRUCT_SMALL]]* @_ZN5SmallC1Ev(%[[STRUCT_SMALL]]* %[[AGG_TMP1]])
// CHECK: call void @_Z20calleeExceptionSmall5SmallS_(i64 %{{.*}}, i64 %{{.*}})
// CHECK-NEXT: ret void
// CHECK: landingpad { i8*, i32 }
// CHECK: call %[[STRUCT_SMALL]]* @_ZN5SmallD1Ev(%[[STRUCT_SMALL]]* %[[AGG_TMP]])
// CHECK: br
// CHECK: resume { i8*, i32 }
void calleeExceptionSmall(Small, Small);
void testExceptionSmall() {
calleeExceptionSmall(Small(), Small());
}
// CHECK: define void @_Z18testExceptionLargev()
// CHECK: %[[AGG_TMP:.*]] = alloca %[[STRUCT_LARGE]], align 8
// CHECK: %[[AGG_TMP1:.*]] = alloca %[[STRUCT_LARGE]], align 8
// CHECK: call %[[STRUCT_LARGE]]* @_ZN5LargeC1Ev(%[[STRUCT_LARGE]]* %[[AGG_TMP]])
// CHECK: invoke %[[STRUCT_LARGE]]* @_ZN5LargeC1Ev(%[[STRUCT_LARGE]]* %[[AGG_TMP1]])
// CHECK: call void @_Z20calleeExceptionLarge5LargeS_(%[[STRUCT_LARGE]]* %[[AGG_TMP]], %[[STRUCT_LARGE]]* %[[AGG_TMP1]])
// CHECK-NEXT: ret void
// CHECK: landingpad { i8*, i32 }
// CHECK: call %[[STRUCT_LARGE]]* @_ZN5LargeD1Ev(%[[STRUCT_LARGE]]* %[[AGG_TMP]])
// CHECK: br
// CHECK: resume { i8*, i32 }
void calleeExceptionLarge(Large, Large);
void testExceptionLarge() {
calleeExceptionLarge(Large(), Large());
}
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