Changeset 8884112 for src/SymTab

Timestamp:

Jul 13, 2016, 1:43:57 PM (8 years ago)

Author:

Aaron Moss <a3moss@…>

Branches:

ADT, aaron-thesis, arm-eh, ast-experimental, cleanup-dtors, ctor, deferred_resn, demangler, enum, forall-pointer-decay, jacob/cs343-translation, jenkins-sandbox, master, memory, new-ast, new-ast-unique-expr, new-env, no_list, persistent-indexer, pthread-emulation, qualifiedEnum, resolv-new, with_gc

Children:

d1b9d78

Parents:

a3e1f8f

Message:

Indexer now produces errors on CFA functions that overload C functions, does not consider restrict qualifier to break compatibility

Location:

src/SymTab

Files:

• Indexer.cc (modified) (2 diffs)
• Indexer.h (modified) (1 diff)
• Mangler.cc (modified) (1 diff)

src/SymTab/Indexer.cc

@@ -527 +527 @@
 
                 return tables->base.hasIncompatibleCDecl( id, mangleName, scope );
+        }
+
+        bool Indexer::hasCompatibleCDecl( const std::string &id, const std::string &mangleName, unsigned long scope ) const {
+                if ( ! tables ) return false;
+                if ( tables->scope < scope ) return false;
+
+                IdTable::const_iterator decls = tables->idTable.find( id );
+                if ( decls != tables->idTable.end() ) {
+                        const MangleTable &mangleTable = decls->second;
+                        for ( MangleTable::const_iterator decl = mangleTable.begin(); decl != mangleTable.end(); ++decl ) {
+                                // check for C decls with the same name, skipping
+                                // those with an incompatible type (by mangleName)
+                                if ( decl->second->get_linkage() == LinkageSpec::C && decl->first == mangleName ) return true;
+                        }
+                }
+
+                return tables->base.hasCompatibleCDecl( id, mangleName, scope );
         }
 
@@ -617 +634 @@
                 } // if
 
+                // this ensures that no two declarations with the same unmangled name at the same scope both have C linkage
+                if ( decl->get_linkage() == LinkageSpec::C ) {
+                        // NOTE this is broken in Richard's original code in such a way that it never triggers (it
+                        // doesn't check decls that have the same manglename, and all C-linkage decls are defined to
+                        // have their name as their manglename, hence the error can never trigger).
+                        // The code here is closer to correct, but name mangling would have to be completely
+                        // isomorphic to C type-compatibility, which it may not be.
+                        if ( hasIncompatibleCDecl( name, mangleName, scope ) ) {
+                                throw SemanticError( "conflicting overload of C function ", decl );
+                        }
+                } else {
+                        // Check that a Cforall declaration doesn't overload any C declaration
+                        if ( hasCompatibleCDecl( name, mangleName, scope ) ) {
+                                throw SemanticError( "Cforall declaration hides C function ", decl );
+                        }
+                }
+
+                // Skip repeat declarations of the same identifier
                 DeclarationWithType *existing = lookupIdAtScope( name, mangleName, scope );
-                if ( ! existing || ! addedIdConflicts( existing, decl ) ) {
-                        // this ensures that no two declarations with the same unmangled name at the same scope both have C linkage
-                        if ( decl->get_linkage() == LinkageSpec::C && hasIncompatibleCDecl( name, mangleName, scope ) ) {
-                                throw SemanticError( "invalid overload of C function ", decl );
-                        } // NOTE this is broken in Richard's original code in such a way that it never triggers (it
-                          // doesn't check decls that have the same manglename, and all C-linkage decls are defined to
-                          // have their name as their manglename, hence the error can never trigger).
-                          // The code here is closer to correct, but name mangling would have to be completely
-                          // isomorphic to C type-compatibility, which it may not be.
-
-                        tables->idTable[ name ][ mangleName ] = decl;
-                        ++tables->size;
-                }
+                if ( existing && addedIdConflicts( existing, decl ) ) return;
+
+                // add to indexer
+                tables->idTable[ name ][ mangleName ] = decl;
+                ++tables->size;
         }
 

src/SymTab/Indexer.h

@@ -100 +100 @@
                 /// returns true if there exists a declaration with C linkage and the given name with a different mangled name
                 bool hasIncompatibleCDecl( const std::string &id, const std::string &mangleName, unsigned long scope ) const;
+                /// returns true if there exists a declaration with C linkage and the given name with the same mangled name
+                bool hasCompatibleCDecl( const std::string &id, const std::string &mangleName, unsigned long scope ) const;
                 // equivalents to lookup functions that only look at tables at scope `scope` (which should be >= tables->scope)
                 NamedTypeDecl *lookupTypeAtScope( const std::string &id, unsigned long scope ) const;

src/SymTab/Mangler.cc

@@ -282 +282 @@
                         mangleName << "V";
                 } // if
-                if ( type->get_isRestrict() ) {
-                        mangleName << "R";
-                } // if
+                // Removed due to restrict not affecting function compatibility in GCC
+//              if ( type->get_isRestrict() ) {
+//                      mangleName << "R";
+//              } // if
                 if ( type->get_isLvalue() ) {
                         mangleName << "L";