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8e57b07f66
from those that aren't. This patch changes the way __block variables that aren't captured by escaping blocks are handled: - Since non-escaping blocks on the stack never get copied to the heap (see https://reviews.llvm.org/D49303), Sema shouldn't error out when the type of a non-escaping __block variable doesn't have an accessible copy constructor. - IRGen doesn't have to use the specialized byref structure (see https://clang.llvm.org/docs/Block-ABI-Apple.html#id8) for a non-escaping __block variable anymore. Instead IRGen can emit the variable as a normal variable and copy the reference to the block literal. Byref copy/dispose helpers aren't needed either. This reapplies r343518 after fixing a use-after-free bug in function Sema::ActOnBlockStmtExpr where the BlockScopeInfo was dereferenced after it was popped and deleted. rdar://problem/39352313 Differential Revision: https://reviews.llvm.org/D51564 llvm-svn: 343542
36 lines
2.0 KiB
C++
36 lines
2.0 KiB
C++
// RUN: %clang_cc1 -x c++-header -triple x86_64-apple-darwin11 -emit-pch -fblocks -fexceptions -o %t %S/block-helpers.h
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// RUN: %clang_cc1 -triple x86_64-apple-darwin11 -include-pch %t -emit-llvm -fblocks -fexceptions -o - %s | FileCheck %s
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// CHECK: %[[STRUCT_BLOCK_BYREF_X:.*]] = type { i8*, %[[STRUCT_BLOCK_BYREF_X]]*, i32, i32, i8*, i8*, %[[STRUCT_S0:.*]] }
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// CHECK: %[[STRUCT_S0]] = type { i32 }
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// CHECK: %[[STRUCT_BLOCK_BYREF_Y:.*]] = type { i8*, %[[STRUCT_BLOCK_BYREF_Y]]*, i32, i32, i8*, i8*, %[[STRUCT_S0]] }
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// CHECK: %[[STRUCT_BLOCK_DESCRIPTOR:.*]] = type { i64, i64 }
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// Check that byref structs are allocated for x and y.
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// CHECK-LABEL: define linkonce_odr void @_ZN1S1mEv(
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// CHECK: %[[X:.*]] = alloca %[[STRUCT_BLOCK_BYREF_X]], align 8
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// CHECK: %[[Y:.*]] = alloca %[[STRUCT_BLOCK_BYREF_Y]], align 8
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// CHECK: %[[BLOCK:.*]] = alloca <{ i8*, i32, i32, i8*, %[[STRUCT_BLOCK_DESCRIPTOR]]*, i8*, i8* }>, align 8
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// CHECK: %[[BLOCK_CAPTURED:.*]] = getelementptr inbounds <{ i8*, i32, i32, i8*, %[[STRUCT_BLOCK_DESCRIPTOR]]*, i8*, i8* }>, <{ i8*, i32, i32, i8*, %[[STRUCT_BLOCK_DESCRIPTOR]]*, i8*, i8* }>* %[[BLOCK]], i32 0, i32 5
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// CHECK: %[[V0:.*]] = bitcast %[[STRUCT_BLOCK_BYREF_X]]* %[[X]] to i8*
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// CHECK: store i8* %[[V0]], i8** %[[BLOCK_CAPTURED]], align 8
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// CHECK: %[[BLOCK_CAPTURED10:.*]] = getelementptr inbounds <{ i8*, i32, i32, i8*, %[[STRUCT_BLOCK_DESCRIPTOR]]*, i8*, i8* }>, <{ i8*, i32, i32, i8*, %[[STRUCT_BLOCK_DESCRIPTOR]]*, i8*, i8* }>* %[[BLOCK]], i32 0, i32 6
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// CHECK: %[[V1:.*]] = bitcast %[[STRUCT_BLOCK_BYREF_Y]]* %[[Y]] to i8*
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// CHECK: store i8* %[[V1]], i8** %[[BLOCK_CAPTURED10]], align 8
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// CHECK-LABEL: define internal void @___ZN1S1mEv_block_invoke(
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// The second call to block_object_assign should be an invoke.
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// CHECK-LABEL: define linkonce_odr hidden void @__copy_helper_block_e8_32rc40rc(
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// CHECK: call void @_Block_object_assign(
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// CHECK: invoke void @_Block_object_assign(
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// CHECK: call void @_Block_object_dispose(
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// CHECK-LABEL: define linkonce_odr hidden void @__destroy_helper_block_e8_32r40r(
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void test() {
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S s;
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s.m();
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}
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