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 "$_<n>" in lambda's mangled name. Here, "n" is the AnonStructIds field in MangleContext. Different mangled names for a unchanged function is undesirable: it makes perf comparison harder, and can cause some unnecessary profile mismatch in SampleFDO. This patch makes mangled name for lambda functions more stable by changing AnonStructIds to a per-function based seq number if the DeclContext is a function. Differential Revision: https://reviews.llvm.org/D136397
54 lines
1.6 KiB
C++
54 lines
1.6 KiB
C++
// RUN: %clang_cc1 -triple x86_64-linux-gnu %s -emit-llvm -o - \
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// RUN: -Werror=unknown-attributes \
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// RUN: | FileCheck %s --check-prefixes=CHECK,CHECK-NOM
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// RUN: %clang_cc1 -triple x86_64-linux-gnu %s -emit-llvm -o - \
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// RUN: -Werror=unknown-attributes -mfunction-return=keep \
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// RUN: | FileCheck %s --check-prefixes=CHECK,CHECK-KEEP
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// RUN: %clang_cc1 -triple x86_64-linux-gnu %s -emit-llvm -o - \
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// RUN: -Werror=unknown-attributes -mfunction-return=thunk-extern \
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// RUN: | FileCheck %s --check-prefixes=CHECK,CHECK-EXTERN
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int foo(void) {
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// CHECK: @"_ZZ3foovENK3$_0clEv"({{.*}}) [[NOATTR:#[0-9]+]]
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return []() {
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return 42;
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}();
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}
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int bar(void) {
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// CHECK: @"_ZZ3barvENK3$_0clEv"({{.*}}) [[EXTERN:#[0-9]+]]
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return []() __attribute__((function_return("thunk-extern"))) {
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return 42;
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}
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();
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}
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int baz(void) {
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// CHECK: @"_ZZ3bazvENK3$_0clEv"({{.*}}) [[KEEP:#[0-9]+]]
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return []() __attribute__((function_return("keep"))) {
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return 42;
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}
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();
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}
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class Foo {
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public:
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// CHECK: @_ZN3Foo3fooEv({{.*}}) [[EXTERN]]
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__attribute__((function_return("thunk-extern"))) int foo() { return 42; }
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};
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int quux() {
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Foo my_foo;
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return my_foo.foo();
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}
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// CHECK: @extern_c() [[EXTERN]]
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extern "C" __attribute__((function_return("thunk-extern"))) void extern_c() {}
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extern "C" {
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// CHECK: @extern_c2() [[EXTERN]]
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__attribute__((function_return("thunk-extern"))) void extern_c2() {}
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}
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// CHECK-NOM-NOT: [[NOATTR]] = {{.*}}fn_ret_thunk_extern
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// CHECK-KEEP-NOT: [[NOATTR]] = {{.*}}fn_ret_thunk_extern
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// CHECK-KEEP-NOT: [[KEEP]] = {{.*}}fn_ret_thunk_extern
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// CHECK-EXTERN: [[EXTERN]] = {{.*}}fn_ret_thunk_extern
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