6cee539337
Clang is generating different mangled names for the same lambda function in slightly changed builds (like with non-related source/Macro change). This is due to the fact that clang uses a cross-translation-unit sequential string "$_<n>" in lambda's mangled name. Here, "n" is the AnonStructIds field in MangleContext. Different mangled names for a unchanged function is undesirable: it makes perf comparison harder, and can cause some unnecessary profile mismatch in SampleFDO. This patch makes mangled name for lambda functions more stable by changing AnonStructIds to a per-function based seq number if the DeclContext is a function. Differential Revision: https://reviews.llvm.org/D136397
48 lines
1.6 KiB
Plaintext
48 lines
1.6 KiB
Plaintext
// RUN: %clang_cc1 -no-opaque-pointers -no-enable-noundef-analysis -fblocks -disable-llvm-passes -triple x86_64-apple-darwin10 -std=c++17 -emit-llvm -o - %s | FileCheck %s
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typedef void (^blk_t)();
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typedef void (*fnptr_t)();
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@interface X
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@property blk_t blk;
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@property fnptr_t fnptr;
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@end
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template <class T>
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blk_t operator+(blk_t lhs, T) { return lhs; }
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template <class T>
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fnptr_t operator+(fnptr_t lhs, T) { return lhs; }
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// CHECK-LABEL: define{{.*}} void @_Z2t1P1X
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void t1(X *x) {
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// Check that we call lambda.operator blk_t(), and that we send that result to
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// the setter.
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// CHECK: [[CALL:%.*]] = call void ()* @"_ZZ2t1P1XENK3$_0cvU13block_pointerFvvEEv"
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// CHECK: call void{{.*}}@objc_msgSend{{.*}}({{.*}} void ()* [[CALL]])
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x.blk = [] {};
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// CHECK: [[CALL2:%.*]] = call void ()* @"_ZZ2t1P1XENK3$_1cvPFvvEEv"
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// CHECK: call void{{.*}}@objc_msgSend{{.*}}({{.*}} void ()* [[CALL2]])
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x.fnptr = [] {};
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}
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// CHECK-LABEL: define{{.*}} void @_Z2t2P1X
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void t2(X *x) {
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// Test the case when the lambda isn't unique. (see OpaqueValueExpr::isUnique)
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// FIXME: This asserts if the lambda isn't trivially copy/movable.
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// [x setBlk: operator+([x blk], [] {})]
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// CHECK: call void{{.*}}@objc_msgSend{{.*}}
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// CHECK: [[PLUS:%.*]] = call void ()* @"_ZplIZ2t2P1XE3$_0EU13block_pointerFvvES4_T_"
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// CHECK: call void{{.*}}@objc_msgSend{{.*}}({{.*}} [[PLUS]])
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x.blk += [] {};
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// CHECK: call void{{.*}}@objc_msgSend{{.*}}
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// CHECK: [[PLUS:%.*]] = call void ()* @"_ZplIZ2t2P1XE3$_1EPFvvES4_T_"
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// CHECK: call void{{.*}}@objc_msgSend{{.*}}({{.*}} [[PLUS]])
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x.fnptr += [] {};
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}
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