clang: Allow ifunc resolvers to accept arguments

When ifunc support was added to Clang (r265917) it did not allow
resolvers to take function arguments.  This was based on GCC's
documentation, which states resolvers return a pointer and take no
arguments.

However, GCC actually allows resolvers to take arguments, and glibc (on
non-x86 platforms) and FreeBSD (on x86 and arm64) pass some CPU
identification information as arguments to ifunc resolvers.  I believe
GCC's documentation is simply incorrect / out-of-date.

FreeBSD already removed the prohibition in their in-tree Clang copy.

Differential Revision:	https://reviews.llvm.org/D52703

git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@344100 91177308-0d34-0410-b5e6-96231b3b80d8

diff --git a/include/clang/Basic/AttrDocs.td b/include/clang/Basic/AttrDocs.td
index a90cb96c07cda02584e3706c3504d3f593456c22..02eac41868a1995499dedaa56d2aac60a933b9be 100644 (file)
--- a/include/clang/Basic/AttrDocs.td
+++ b/include/clang/Basic/AttrDocs.td
@@ -3428,7 +3428,7 @@ def IFuncDocs : Documentation {
   let Content = [{
 ``__attribute__((ifunc("resolver")))`` is used to mark that the address of a declaration should be resolved at runtime by calling a resolver function.
 
-The symbol name of the resolver function is given in quotes.  A function with this name (after mangling) must be defined in the current translation unit; it may be ``static``.  The resolver function should take no arguments and return a pointer.
+The symbol name of the resolver function is given in quotes.  A function with this name (after mangling) must be defined in the current translation unit; it may be ``static``.  The resolver function should return a pointer.
 
 The ``ifunc`` attribute may only be used on a function declaration.  A function declaration with an ``ifunc`` attribute is considered to be a definition of the declared entity.  The entity must not have weak linkage; for example, in C++, it cannot be applied to a declaration if a definition at that location would be considered inline.
 

diff --git a/include/clang/Basic/DiagnosticSemaKinds.td b/include/clang/Basic/DiagnosticSemaKinds.td
index 2bab1ec322b81d799ce92f287749f31ea130383d..b00e8b1ad6c8d35b1fa8e78d4acc09061fcf194f 100644 (file)
--- a/include/clang/Basic/DiagnosticSemaKinds.td
+++ b/include/clang/Basic/DiagnosticSemaKinds.td
@@ -2889,8 +2889,6 @@ def err_cyclic_alias : Error<
   "%select{alias|ifunc}0 definition is part of a cycle">;
 def err_ifunc_resolver_return : Error<
   "ifunc resolver function must return a pointer">;
-def err_ifunc_resolver_params : Error<
-  "ifunc resolver function must have no parameters">;
 def warn_attribute_wrong_decl_type_str : Warning<
   "%0 attribute only applies to %1">, InGroup<IgnoredAttributes>;
 def err_attribute_wrong_decl_type_str : Error<

diff --git a/lib/CodeGen/CodeGenModule.cpp b/lib/CodeGen/CodeGenModule.cpp
index dbea1fc7112b5465c5599db1edb5053bcfdbcaa1..12ed65cf2675198ac7c583d4fd53de77fd1bdc0d 100644 (file)
--- a/lib/CodeGen/CodeGenModule.cpp
+++ b/lib/CodeGen/CodeGenModule.cpp
@@ -322,8 +322,6 @@ void CodeGenModule::checkAliases() {
       assert(FTy);
       if (!FTy->getReturnType()->isPointerTy())
         Diags.Report(Location, diag::err_ifunc_resolver_return);
-      if (FTy->getNumParams())
-        Diags.Report(Location, diag::err_ifunc_resolver_params);
     }
 
     llvm::Constant *Aliasee = Alias->getIndirectSymbol();

diff --git a/test/Sema/attr-ifunc.c b/test/Sema/attr-ifunc.c
index af7a7e33da0967b54df59419043b47b41ca48952..907b61c4451e0cb6985f716a0126dd967b87f498 100644 (file)
--- a/test/Sema/attr-ifunc.c
+++ b/test/Sema/attr-ifunc.c
@@ -27,10 +27,6 @@ void f4_ifunc() {}
 void f4() __attribute__((ifunc("f4_ifunc")));
 //expected-error@-1 {{ifunc resolver function must return a pointer}}
 
-void* f5_ifunc(int i) { return 0; }
-void f5() __attribute__((ifunc("f5_ifunc")));
-//expected-error@-1 {{ifunc resolver function must have no parameters}}
-
 #else
 void f1a() __asm("f1");
 void f1a() {}