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llvm-project/clang/test/CodeGenObjC/mrc-weak.m
Akira Hatanaka 9978da3615 [CodeGen] Merge equivalent block copy/helper functions. 
Clang generates copy and dispose helper functions for each block literal
on the stack. Often these functions are equivalent for different blocks.
This commit makes changes to merge equivalent copy and dispose helper
functions and reduce code size.

To enable merging equivalent copy/dispose functions, the captured object
infomation is encoded into the helper function name. This allows IRGen
to check whether an equivalent helper function has already been emitted
and reuse the function instead of generating a new helper function
whenever a block is defined. In addition, the helper functions are
marked as linkonce_odr to enable merging helper functions that have the
same name across translation units and marked as unnamed_addr to enable
the linker's deduplication pass to merge functions that have different
names but the same content.

rdar://problem/42640608

Differential Revision: https://reviews.llvm.org/D50152

llvm-svn: 339438
2018-08-10 15:09:24 +00:00

192 lines
6.4 KiB
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// RUN: %clang_cc1 -triple x86_64-apple-darwin10 -fobjc-runtime=macosx-10.10 -emit-llvm -fblocks -fobjc-weak -o - %s | FileCheck %s -check-prefix=CHECK -check-prefix=CHECK-MODERN
// RUN: %clang_cc1 -triple i386-apple-darwin10 -fobjc-runtime=macosx-fragile-10.10 -emit-llvm -fblocks -fobjc-weak -o - %s | FileCheck %s -check-prefix=CHECK -check-prefix=CHECK-FRAGILE
@interface Object
- (instancetype) retain;
- (void) run;
@end
// The ivars in HighlyAlignedSubclass should be placed in the tail-padding
// of the superclass. Ensure that they're still covered by layouts.
@interface HighlyAligned : Object {
__attribute__((aligned(32))) void *array[2];
}
@end
// CHECK-MODERN: @"OBJC_IVAR_$_HighlyAlignedSubclass.ivar2" = global i64 24,
// CHECK-MODERN: @"OBJC_IVAR_$_HighlyAlignedSubclass.ivar" = global i64 16,
// CHECK-MODERN: @OBJC_CLASS_NAME_{{.*}} = {{.*}} c"\02\00"
// CHECK-MODERN: @"\01l_OBJC_CLASS_RO_$_HighlyAlignedSubclass" = {{.*}} {
// CHECK-FRAGILE: @OBJC_INSTANCE_VARIABLES_HighlyAlignedSubclass = {{.*}}, i32 8 }, {{.*}}, i32 12 }]
// CHECK-FRAGILE: @OBJC_CLASS_NAME_{{.*}} = {{.*}} c"\02\00"
// CHECK-FRAGILE: @OBJC_CLASS_HighlyAlignedSubclass
@interface HighlyAlignedSubclass : HighlyAligned {
__weak id ivar;
__weak id ivar2;
}
@end
@implementation HighlyAlignedSubclass @end
// CHECK-MODERN: @OBJC_CLASS_NAME_{{.*}} = {{.*}} c"\01\00"
// CHECK-MODERN: @"\01l_OBJC_CLASS_RO_$_Foo" = {{.*}} { i32 772
// 772 == 0x304
// ^ HasMRCWeakIvars
// ^ HasCXXDestructorOnly
// ^ HasCXXStructors
// CHECK-FRAGILE: @OBJC_CLASS_NAME_{{.*}} = {{.*}} c"\01\00"
// CHECK-FRAGILE: @OBJC_CLASS_Foo = {{.*}} i32 134225921,
// 134225921 == 0x08002001
// ^ HasMRCWeakIvars
// ^ HasCXXStructors
// ^ Factory
@interface Foo : Object {
__weak id ivar;
}
@end
@implementation Foo
// CHECK-LABEL: define internal void @"\01-[Foo .cxx_destruct]"
// CHECK: call void @objc_destroyWeak
@end
void test1(__weak id x) {}
// CHECK-LABEL: define void @test1
// CHECK: [[X:%.*]] = alloca i8*,
// CHECK-NEXT: objc_initWeak
// CHECK-NEXT: objc_destroyWeak
// CHECK-NEXT: ret void
void test2(id y) {
__weak id z = y;
}
// CHECK-LABEL: define void @test2
// CHECK: [[Y:%.*]] = alloca i8*,
// CHECK-NEXT: [[Z:%.*]] = alloca i8*,
// CHECK-NEXT: store
// CHECK-NEXT: [[T0:%.*]] = load i8*, i8** [[Y]]
// CHECK-NEXT: call i8* @objc_initWeak(i8** [[Z]], i8* [[T0]])
// CHECK-NEXT: call void @objc_destroyWeak(i8** [[Z]])
// CHECK-NEXT: ret void
void test3(id y) {
__weak id z;
z = y;
}
// CHECK-LABEL: define void @test3
// CHECK: [[Y:%.*]] = alloca i8*,
// CHECK-NEXT: [[Z:%.*]] = alloca i8*,
// CHECK-NEXT: store
// CHECK-NEXT: store i8* null, i8** [[Z]]
// CHECK-NEXT: [[T0:%.*]] = load i8*, i8** [[Y]]
// CHECK-NEXT: call i8* @objc_storeWeak(i8** [[Z]], i8* [[T0]])
// CHECK-NEXT: call void @objc_destroyWeak(i8** [[Z]])
// CHECK-NEXT: ret void
void test4(__weak id *p) {
id y = *p;
}
// CHECK-LABEL: define void @test4
// CHECK: [[P:%.*]] = alloca i8**,
// CHECK-NEXT: [[Y:%.*]] = alloca i8*,
// CHECK-NEXT: store
// CHECK-NEXT: [[T0:%.*]] = load i8**, i8*** [[P]]
// CHECK-NEXT: [[T1:%.*]] = call i8* @objc_loadWeak(i8** [[T0]])
// CHECK-NEXT: store i8* [[T1]], i8** [[Y]]
// CHECK-NEXT: ret void
void test5(__weak id *p) {
id y = [*p retain];
}
// CHECK-LABEL: define void @test5
// CHECK: [[P:%.*]] = alloca i8**,
// CHECK-NEXT: [[Y:%.*]] = alloca i8*,
// CHECK-NEXT: store
// CHECK-NEXT: [[T0:%.*]] = load i8**, i8*** [[P]]
// CHECK-NEXT: [[T1:%.*]] = call i8* @objc_loadWeakRetained(i8** [[T0]])
// CHECK-NEXT: store i8* [[T1]], i8** [[Y]]
// CHECK-NEXT: ret void
void test6(__weak Foo **p) {
Foo *y = [*p retain];
}
// CHECK-LABEL: define void @test6
// CHECK: [[P:%.*]] = alloca [[FOO:%.*]]**,
// CHECK-NEXT: [[Y:%.*]] = alloca [[FOO]]*,
// CHECK-NEXT: store
// CHECK-NEXT: [[T0:%.*]] = load [[FOO]]**, [[FOO]]*** [[P]]
// CHECK-NEXT: [[T1:%.*]] = bitcast [[FOO]]** [[T0]] to i8**
// CHECK-NEXT: [[T2:%.*]] = call i8* @objc_loadWeakRetained(i8** [[T1]])
// CHECK-NEXT: [[T3:%.*]] = bitcast i8* [[T2]] to [[FOO]]*
// CHECK-NEXT: store [[FOO]]* [[T3]], [[FOO]]** [[Y]]
// CHECK-NEXT: ret void
extern id get_object(void);
extern void use_block(void (^)(void));
void test7(void) {
__weak Foo *p = get_object();
use_block(^{ [p run ]; });
}
// CHECK-LABEL: define void @test7
// CHECK: [[P:%.*]] = alloca [[FOO]]*,
// CHECK: [[T0:%.*]] = call i8* @get_object()
// CHECK-NEXT: [[T1:%.*]] = bitcast i8* [[T0]] to [[FOO]]*
// CHECK-NEXT: [[T2:%.*]] = bitcast [[FOO]]** [[P]] to i8**
// CHECK-NEXT: [[T3:%.*]] = bitcast [[FOO]]* [[T1]] to i8*
// CHECK-NEXT: call i8* @objc_initWeak(i8** [[T2]], i8* [[T3]])
// CHECK: call void @objc_copyWeak
// CHECK: call void @use_block
// CHECK: call void @objc_destroyWeak
// CHECK-LABEL: define linkonce_odr hidden void @__copy_helper_block
// CHECK: @objc_copyWeak
// CHECK-LABEL: define linkonce_odr hidden void @__destroy_helper_block
// CHECK: @objc_destroyWeak
void test8(void) {
__block __weak Foo *p = get_object();
use_block(^{ [p run ]; });
}
// CHECK-LABEL: define void @test8
// CHECK: call i8* @objc_initWeak
// CHECK-NOT: call void @objc_copyWeak
// CHECK: call void @use_block
// CHECK: call void @objc_destroyWeak
// CHECK-LABEL: define internal void @__Block_byref_object_copy
// CHECK: call void @objc_moveWeak
// CHECK-LABEL: define internal void @__Block_byref_object_dispose
// CHECK: call void @objc_destroyWeak
// CHECK-LABEL: define void @test9_baseline()
// CHECK: define linkonce_odr hidden void @__copy_helper
// CHECK: define linkonce_odr hidden void @__destroy_helper
void test9_baseline(void) {
Foo *p = get_object();
use_block(^{ [p run]; });
}
// CHECK-LABEL: define void @test9()
// CHECK-NOT: define linkonce_odr hidden void @__copy_helper
// CHECK-NOT: define linkonce_odr hidden void @__destroy_helper
// CHECK: define void @test9_fin()
void test9(void) {
__unsafe_unretained Foo *p = get_object();
use_block(^{ [p run]; });
}
void test9_fin() {}
// CHECK-LABEL: define void @test10()
// CHECK-NOT: define linkonce_odr hidden void @__copy_helper
// CHECK-NOT: define linkonce_odr hidden void @__destroy_helper
// CHECK: define void @test10_fin()
void test10(void) {
typedef __unsafe_unretained Foo *UnsafeFooPtr;
UnsafeFooPtr p = get_object();
use_block(^{ [p run]; });
}
void test10_fin() {}
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