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 "$_<n>" in lambda's mangled name. Here, "n" is the AnonStructIds field in MangleContext. Different mangled names for a unchanged function is undesirable: it makes perf comparison harder, and can cause some unnecessary profile mismatch in SampleFDO. This patch makes mangled name for lambda functions more stable by changing AnonStructIds to a per-function based seq number if the DeclContext is a function. Differential Revision: https://reviews.llvm.org/D136397
77 lines
2.6 KiB
C++
77 lines
2.6 KiB
C++
// RUN: %clang_cc1 -no-opaque-pointers -triple x86_64-apple-darwin10.0.0 -fblocks -emit-llvm -o - %s -fexceptions -std=c++11 | FileCheck %s
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// RUN: %clang_cc1 -no-opaque-pointers -triple x86_64-apple-darwin10.0.0 -fblocks -emit-llvm -o - %s -fexceptions -std=c++14 | FileCheck --check-prefixes=CHECK,CXX14 %s
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// CHECK-LABEL: define{{.*}} void @_ZN19non_inline_function3fooEv()
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// CHECK-LABEL: define internal void @"_ZZN19non_inline_function3fooEvENK3$_0clEi"(%class.anon
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// CHECK-LABEL: define internal noundef signext i8 @"_ZZZN19non_inline_function3fooEvENK3$_0clEiENKUlcE_clEc"(%class.anon
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namespace non_inline_function {
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void foo() {
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auto L = [](int a) {
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return [](char b) {
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return b;
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};
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};
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L(3)('a');
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}
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}
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namespace non_template {
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struct L {
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int t = ([](int a) { return [](int b) { return b; };})(2)(3);
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};
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L l;
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}
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// It's important that this is not in a namespace; we're testing the mangling
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// of lambdas in top-level inline variables here.
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inline auto lambda_in_inline_variable = [] {};
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template<typename T> struct Wrap {};
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// CHECK-LABEL: define {{.*}} @_Z30test_lambda_in_inline_variable4WrapIN25lambda_in_inline_variableMUlvE_EE
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void test_lambda_in_inline_variable(Wrap<decltype(lambda_in_inline_variable)>) {}
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namespace lambdas_in_NSDMIs_template_class {
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template<class T>
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struct L {
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T t2 = ([](int a) { return [](int b) { return b; };})(T{})(T{});
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};
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L<int> l;
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}
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// CHECK-LABEL: define linkonce_odr noundef i32 @_ZN15inline_function3fooEv
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// CHECK-LABEL: define linkonce_odr void @_ZNK12non_template1L1tMUliE_clEi(%class.anon
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// CHECK-LABEL: define linkonce_odr noundef i32 @_ZZNK12non_template1L1tMUliE_clEiENKUliE_clEi(%class.anon
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// CHECK-LABEL: define linkonce_odr void @_ZNK32lambdas_in_NSDMIs_template_class1LIiEUliE_clEi(%class.anon
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// CHECK-LABEL: define linkonce_odr noundef i32 @_ZZNK32lambdas_in_NSDMIs_template_class1LIiEUliE_clEiENKUliE_clEi(%class.anon
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// CHECK-LABEL: define linkonce_odr void @_ZZN15inline_function3fooEvENKUliE_clEi
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// CHECK-LABEL: define linkonce_odr noundef signext i8 @_ZZZN15inline_function3fooEvENKUliE_clEiENKUlcE_clEc
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namespace inline_function {
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inline int foo() {
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auto L = [](int a) {
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return [](char b) {
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return b;
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};
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};
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L(3)('a');
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}
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int use = foo();
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}
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#if __cplusplus >= 201402L
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// CXX14-LABEL: define internal void @"_ZZZN32lambda_capture_in_generic_lambda3fooIiEEDavENKUlT_E_clIZNS_L1fEvE3$_0EEDaS1_ENKUlvE_clEv"
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namespace lambda_capture_in_generic_lambda {
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template <typename T> auto foo() {
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return [](auto func) {
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[func] { func(); }();
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};
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}
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static void f() {
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foo<int>()([] { });
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}
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void f1() { f(); }
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}
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#endif
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