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Lifetime extended temporary objects that are bound to references with static storage duration may have external linkage and therefore require mangled symbol names. Clang uses an extension of the Microsoft ABI to give these symbols an implicit name of '$RT' followed by a discriminator and then mangles them similarly to the variable they are bound to. Clang's mangling scheme differs from the one used by MSVC. Previously, the `$RT<discriminator>` portion of the name was not registered as a back reference candidate and this resulted in incorrect back references for enclosing class and/or namespace scopes that might be referenced in the type of the object. This is an ABI change and has the potential to cause backward compatibility issues with previous Clang releases. Since MSVC uses a different mangling scheme, this change does not affect compatibility with MSVC. This fixes one of the name mangling concerns reported in #85423.
116 lines
3.1 KiB
C++
116 lines
3.1 KiB
C++
// RUN: %clang_cc1 -fms-extensions -fblocks -emit-llvm %s -o - -triple=i386-pc-win32 | FileCheck %s
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namespace NS {
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// The name "RT1" for the name of the class below has been specifically
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// chosen to ensure that back reference lookup does not match against the
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// implicitly generated "$RT1" name of the reference temporary symbol.
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struct RT1 {
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static const RT1& singleton;
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int i;
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};
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const RT1& RT1::singleton = RT1{1};
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}
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// CHECK: "?$RT1@singleton@RT1@NS@@2ABU23@B"
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// CHECK: "?singleton@RT1@NS@@2ABU12@B"
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void f1(const char* a, const char* b) {}
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// CHECK: "?f1@@YAXPBD0@Z"
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void f2(const char* a, char* b) {}
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// CHECK: "?f2@@YAXPBDPAD@Z"
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void f3(int a, const char* b, const char* c) {}
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// CHECK: "?f3@@YAXHPBD0@Z"
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const char *f4(const char* a, const char* b) { return 0; }
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// CHECK: "?f4@@YAPBDPBD0@Z"
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void f5(char const* a, unsigned int b, char c, void const* d, char const* e, unsigned int f) {}
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// CHECK: "?f5@@YAXPBDIDPBX0I@Z"
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void f6(bool a, bool b) {}
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// CHECK: "?f6@@YAX_N0@Z"
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void f7(int a, int* b, int c, int* d, bool e, bool f, bool* g) {}
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// CHECK: "?f7@@YAXHPAHH0_N1PA_N@Z"
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// FIXME: tests for more than 10 types?
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struct S {
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void mbb(bool a, bool b) {}
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};
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void g1(struct S a) {}
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// CHECK: "?g1@@YAXUS@@@Z"
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void g2(struct S a, struct S b) {}
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// CHECK: "?g2@@YAXUS@@0@Z"
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void g3(struct S a, struct S b, struct S* c, struct S* d) {}
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// CHECK: "?g3@@YAXUS@@0PAU1@1@Z"
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void g4(const char* a, struct S* b, const char* c, struct S* d) {
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// CHECK: "?g4@@YAXPBDPAUS@@01@Z"
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b->mbb(false, false);
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// CHECK: "?mbb@S@@QAEX_N0@Z"
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}
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// Make sure that different aliases of built-in types end up mangled as the
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// built-ins.
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typedef unsigned int uintptr_t;
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typedef unsigned int size_t;
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void *h(size_t a, uintptr_t b) { return 0; }
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// CHECK: "?h@@YAPAXII@Z"
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// Function pointers might be mangled in a complex way.
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typedef void (*VoidFunc)();
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typedef int* (*PInt3Func)(int* a, int* b);
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void h1(const char* a, const char* b, VoidFunc c, VoidFunc d) {}
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// CHECK: "?h1@@YAXPBD0P6AXXZ1@Z"
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void h2(void (*f_ptr)(void *), void *arg) {}
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// CHECK: "?h2@@YAXP6AXPAX@Z0@Z"
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PInt3Func h3(PInt3Func x, PInt3Func y, int* z) { return 0; }
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// CHECK: "?h3@@YAP6APAHPAH0@ZP6APAH00@Z10@Z"
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namespace foo {
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void foo() { }
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// CHECK: "?foo@0@YAXXZ"
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}
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class T01;
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class T02;
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class T03;
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class T04;
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class T05;
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class T06;
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class T07;
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class T08;
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class T09;
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class T10;
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class T11;
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template <typename T>
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class H;
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void ManyParams(T01 &, T02 &, T03 &, T04 &, T05 &, T06 &, T07 &, T08 &, T09 &, T10 &, H<T11> &, H<T11> &) {}
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// CHECK: "?ManyParams@@YAXAAVT01@@AAVT02@@AAVT03@@AAVT04@@AAVT05@@AAVT06@@AAVT07@@AAVT08@@AAVT09@@AAVT10@@AAV?$H@VT11@@@@AAV?$H@VT11@@@@@Z"
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namespace NS {
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// The name "TSS0" for the name of the class below has been specifically
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// chosen to ensure that back reference lookup does not match against the
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// implicitly generated "$TSS0" name of the thread safe static initialization
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// variable.
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struct __declspec(dllexport) TSS0 {
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static TSS0& get();
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__forceinline static TSS0& singleton() {
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static TSS0& lsv = get();
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return lsv;
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}
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};
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}
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// CHECK: "?singleton@TSS0@NS@@SAAAU12@XZ"
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// CHECK: "?lsv@?1??singleton@TSS0@NS@@SAAAU23@XZ@4AAU23@A"
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// CHECK: "?$TSS0@?1??singleton@TSS0@NS@@SAAAU23@XZ@4HA"
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