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[CodeGen,test] Test llvm-libc style alias attribute with UsingShadowDecl
The pattern is quite involved and deserves a specific codegen test. This test would catch the bug in the first attempt of #87130
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| // RUN: %clang_cc1 -triple x86_64-linux -verify -emit-llvm-only %s | ||
| // RUN: not %clang_cc1 -triple x86_64-linux -emit-llvm-only -fdiagnostics-parseable-fixits %s 2>&1 | FileCheck %s | ||
| // RUN: %clang_cc1 -triple x86_64-linux -verify -emit-llvm-only -DERR %s | ||
| // RUN: not %clang_cc1 -triple x86_64-linux -emit-llvm-only -fdiagnostics-parseable-fixits -DERR %s 2>&1 | FileCheck %s --check-prefix=FIXIT | ||
| // RUN: %clang_cc1 -triple x86_64-linux -emit-llvm %s -o - | FileCheck %s | ||
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| #ifdef ERR | ||
| void *f1_ifunc(void) { return nullptr; } | ||
| void f1(void) __attribute__((alias("f1_ifunc"))); | ||
| // expected-error@-1 {{alias must point to a defined variable or function}} | ||
| // expected-note@-2 {{must refer to its mangled name}} | ||
| // expected-note@-3 {{function by that name is mangled as}} | ||
| // CHECK: fix-it:"{{.*}}":{[[@LINE-4]]:30-[[@LINE-4]]:47}:"alias(\"_Z8f1_ifuncv\")" | ||
| // FIXIT: fix-it:"{{.*}}":{[[@LINE-4]]:30-[[@LINE-4]]:47}:"alias(\"_Z8f1_ifuncv\")" | ||
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| void *f6_resolver_resolver(void) { return 0; } | ||
| void *f6_resolver(void) __attribute__((alias("f6_resolver_resolver"))); | ||
| // expected-error@-1 {{alias must point to a defined variable or function}} | ||
| // expected-note@-2 {{must refer to its mangled name}} | ||
| // expected-note@-3 {{function by that name is mangled as}} | ||
| // CHECK: fix-it:"{{.*}}":{[[@LINE-4]]:40-[[@LINE-4]]:69}:"alias(\"_Z20f6_resolver_resolverv\")" | ||
| // FIXIT: fix-it:"{{.*}}":{[[@LINE-4]]:40-[[@LINE-4]]:69}:"alias(\"_Z20f6_resolver_resolverv\")" | ||
| void f6(void) __attribute__((alias("f6_resolver"))); | ||
| // expected-error@-1 {{alias must point to a defined variable or function}} | ||
| // expected-note@-2 {{must refer to its mangled name}} | ||
| // expected-note@-3 {{function by that name is mangled as}} | ||
| // CHECK: fix-it:"{{.*}}":{[[@LINE-4]]:30-[[@LINE-4]]:50}:"alias(\"_Z11f6_resolverv\")" | ||
| // FIXIT: fix-it:"{{.*}}":{[[@LINE-4]]:30-[[@LINE-4]]:50}:"alias(\"_Z11f6_resolverv\")" | ||
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| __attribute__((unused, alias("resolver"), deprecated("hahahaha, isn't C great?"))) | ||
| void func(); | ||
| // expected-error@-2 {{alias must point to a defined variable or function}} | ||
| // expected-note@-3 {{must refer to its mangled name}} | ||
| #endif | ||
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| // CHECK: @_ZN4libc4log2Ed ={{.*}} alias double (double), ptr @log2 | ||
| // CHECK: define{{.*}} @log2( | ||
| namespace libc { double log2(double x); } | ||
| extern "C" double log2(double); | ||
| namespace std { using ::log2; } | ||
| using std::log2; | ||
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| namespace libc { | ||
| decltype(libc::log2) __log2_impl__ __asm__("log2"); | ||
| decltype(libc::log2) log2 [[gnu::alias("log2")]]; | ||
| double __log2_impl__(double x) { return x; } | ||
| } |