cdb42a4cc4
D96109 added support for unique internal linkage names for both internal linkage functions and global variables. There was a lot of discussion on how to get the demangling right for functions but I completely missed the point that demanglers do not support suffixes for global vars. For example: $ c++filt _ZL3foo foo $ c++filt _ZL3foo.uniq.123 _ZL3foo.uniq.123 The demangling for functions works as expected. I am not sure of the impact of this. I don't understand how debuggers and other tools depend on the correctness of global variable demangling so I am pre-emptively disabling it until we can get the demangling support added. Importantly, uniquefying global variables is not needed right now as we do not do profile attribution to global vars based on sampling. It was added for completeness and so this feature is not exactly missed. Differential Revision: https://reviews.llvm.org/D98392
61 lines
3.0 KiB
C++
61 lines
3.0 KiB
C++
// This test checks if C++ functions with internal linkage names are mangled
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// and the module hash suffixes attached including emitting DW_AT_linkage_name.
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//
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// RUN: %clang_cc1 -triple x86_64-unknown-linux -debug-info-kind=limited -dwarf-version=4 -emit-llvm -o - %s | FileCheck %s --check-prefix=PLAIN
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// RUN: %clang_cc1 -triple x86_64-unknown-linux -debug-info-kind=limited -dwarf-version=4 -funique-internal-linkage-names -emit-llvm -o - %s | FileCheck %s --check-prefix=UNIQUE
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// RUN: %clang_cc1 -triple x86_64-unknown-linux -debug-info-kind=limited -dwarf-version=5 -emit-llvm -o - %s | FileCheck %s --check-prefix=PLAIN
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// RUN: %clang_cc1 -triple x86_64-unknown-linux -debug-info-kind=limited -dwarf-version=5 -funique-internal-linkage-names -emit-llvm -o - %s | FileCheck %s --check-prefix=UNIQUE
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static int glob_foo = 5;
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static int foo(void) {
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__builtin_printf("%p", &glob_foo);
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return glob_foo;
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}
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// Anonymous namespaces generate internal linkage symbols.
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namespace {
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int glob_bar;
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int bar() {
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return glob_bar;
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}
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}
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extern "C" {
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static int glob_zip;
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static int zip(void) {
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return glob_zip;
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}
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}
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void baz() {
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foo();
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bar();
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zip();
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}
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// PLAIN-DAG: @_ZL8glob_foo = internal global i32
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// PLAIN-DAG: define internal i32 @_ZL3foov()
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// PLAIN-DAG: distinct !DIGlobalVariable(name: "glob_foo", linkageName: "_ZL8glob_foo"{{.*}})
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// PLAIN-DAG: distinct !DISubprogram(name: "foo", linkageName: "_ZL3foov"{{.*}})
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// PLAIN-DAG: @_ZN12_GLOBAL__N_18glob_barE = internal global i32
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// PLAIN-DAG: define internal i32 @_ZN12_GLOBAL__N_13barEv()
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// PLAIN-DAG: distinct !DIGlobalVariable(name: "glob_bar", linkageName: "_ZN12_GLOBAL__N_18glob_barE"{{.*}})
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// PLAIN-DAG: distinct !DISubprogram(name: "bar", linkageName: "_ZN12_GLOBAL__N_13barEv"{{.*}})
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// PLAIN-DAG: @_ZL8glob_zip = internal global i32
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// PLAIN-DAG: define internal i32 @_ZL3zipv()
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// PLAIN-DAG: distinct !DIGlobalVariable(name: "glob_zip", linkageName: "_ZL8glob_zip"{{.*}})
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// PLAIN-DAG: distinct !DISubprogram(name: "zip", linkageName: "_ZL3zipv"{{.*}})
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// UNIQUE-DAG: @_ZL8glob_foo = internal global i32
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// UNIQUE-DAG: define internal i32 @_ZL3foov.[[MODHASH:__uniq\.[0-9]+]]()
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// UNIQUE-DAG: distinct !DIGlobalVariable(name: "glob_foo", linkageName: "_ZL8glob_foo"{{.*}})
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// UNIQUE-DAG: distinct !DISubprogram(name: "foo", linkageName: "_ZL3foov.[[MODHASH]]"{{.*}})
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// UNIQUE-DAG: @_ZN12_GLOBAL__N_18glob_barE = internal global i32
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// UNIQUE-DAG: define internal i32 @_ZN12_GLOBAL__N_13barEv.[[MODHASH]]()
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// UNIQUE-DAG: distinct !DIGlobalVariable(name: "glob_bar", linkageName: "_ZN12_GLOBAL__N_18glob_barE"{{.*}})
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// UNIQUE-DAG: distinct !DISubprogram(name: "bar", linkageName: "_ZN12_GLOBAL__N_13barEv.[[MODHASH]]"{{.*}})
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// UNIQUE-DAG: @_ZL8glob_zip = internal global i32
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// UNIQUE-DAG: define internal i32 @_ZL3zipv.[[MODHASH]]()
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// UNIQUE-DAG: distinct !DIGlobalVariable(name: "glob_zip", linkageName: "_ZL8glob_zip"{{.*}})
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// UNIQUE-DAG: distinct !DISubprogram(name: "zip", linkageName: "_ZL3zipv.[[MODHASH]]"{{.*}})
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