[clang][bytecode] Don't create Function instances for builtins (llvm#137618)

Now that we don't use them anymore in InterpBuiltin.cpp and we don't
create frames for them anymore anyway, just don't create Function
instances.

Author: tbaederr

clang/lib/AST/ByteCode/Compiler.cpp

@@ -4798,10 +4798,6 @@ bool Compiler<Emitter>::VisitBuiltinCallExpr(const CallExpr *E,
     return true;
   }
 
-  const Function *Func = getFunction(E->getDirectCallee());
-  if (!Func)
-    return false;
-
   // For these, we're expected to ultimately return an APValue pointing
   // to the CallExpr. This is needed to get the correct codegen.
   if (BuiltinID == Builtin::BI__builtin___CFStringMakeConstantString ||
@@ -4833,7 +4829,7 @@ bool Compiler<Emitter>::VisitBuiltinCallExpr(const CallExpr *E,
     }
   }
 
-  if (!this->emitCallBI(Func, E, BuiltinID, E))
+  if (!this->emitCallBI(E, BuiltinID, E))
     return false;
 
   if (DiscardResult && !ReturnType->isVoidType()) {

clang/lib/AST/ByteCode/Function.cpp

@@ -26,7 +26,6 @@ Function::Function(Program &P, FunctionDeclTy Source, unsigned ArgSize,
       HasRVO(HasRVO) {
   if (const auto *F = dyn_cast<const FunctionDecl *>(Source)) {
     Variadic = F->isVariadic();
-    BuiltinID = F->getBuiltinID();
     if (const auto *CD = dyn_cast<CXXConstructorDecl>(F)) {
       Virtual = CD->isVirtual();
       Kind = FunctionKind::Ctor;

clang/lib/AST/ByteCode/Function.h

@@ -198,10 +198,6 @@ class Function final {
 
   bool isVariadic() const { return Variadic; }
 
-  unsigned getBuiltinID() const { return BuiltinID; }
-
-  bool isBuiltin() const { return getBuiltinID() != 0; }
-
   unsigned getNumParams() const { return ParamTypes.size(); }
 
   /// Returns the number of parameter this function takes when it's called,
@@ -296,7 +292,6 @@ class Function final {
   bool Defined = false;
   bool Variadic = false;
   bool Virtual = false;
-  unsigned BuiltinID = 0;
 
 public:
   /// Dumps the disassembled bytecode to \c llvm::errs().

clang/lib/AST/ByteCode/Interp.cpp

@@ -1607,15 +1607,15 @@ bool CallVirt(InterpState &S, CodePtr OpPC, const Function *Func,
   return true;
 }
 
-bool CallBI(InterpState &S, CodePtr OpPC, const Function *Func,
-            const CallExpr *CE, uint32_t BuiltinID) {
+bool CallBI(InterpState &S, CodePtr OpPC, const CallExpr *CE,
+            uint32_t BuiltinID) {
   // A little arbitrary, but the current interpreter allows evaluation
   // of builtin functions in this mode, with some exceptions.
   if (BuiltinID == Builtin::BI__builtin_operator_new &&
       S.checkingPotentialConstantExpression())
     return false;
 
-  return InterpretBuiltin(S, OpPC, Func, CE, BuiltinID);
+  return InterpretBuiltin(S, OpPC, CE, BuiltinID);
 }
 
 bool CallPtr(InterpState &S, CodePtr OpPC, uint32_t ArgSize,

clang/lib/AST/ByteCode/Interp.h

@@ -153,8 +153,8 @@ bool Call(InterpState &S, CodePtr OpPC, const Function *Func,
           uint32_t VarArgSize);
 bool CallVirt(InterpState &S, CodePtr OpPC, const Function *Func,
               uint32_t VarArgSize);
-bool CallBI(InterpState &S, CodePtr OpPC, const Function *Func,
-            const CallExpr *CE, uint32_t BuiltinID);
+bool CallBI(InterpState &S, CodePtr OpPC, const CallExpr *CE,
+            uint32_t BuiltinID);
 bool CallPtr(InterpState &S, CodePtr OpPC, uint32_t ArgSize,
              const CallExpr *CE);
 bool CheckLiteralType(InterpState &S, CodePtr OpPC, const Type *T);
@@ -302,8 +302,8 @@ bool CheckDeclRef(InterpState &S, CodePtr OpPC, const DeclRefExpr *DR);
 bool Interpret(InterpState &S);
 
 /// Interpret a builtin function.
-bool InterpretBuiltin(InterpState &S, CodePtr OpPC, const Function *F,
-                      const CallExpr *Call, uint32_t BuiltinID);
+bool InterpretBuiltin(InterpState &S, CodePtr OpPC, const CallExpr *Call,
+                      uint32_t BuiltinID);
 
 /// Interpret an offsetof operation.
 bool InterpretOffsetOf(InterpState &S, CodePtr OpPC, const OffsetOfExpr *E,

clang/lib/AST/ByteCode/InterpBuiltin.cpp

@@ -2184,8 +2184,8 @@ static bool interp__builtin_object_size(InterpState &S, CodePtr OpPC,
   return true;
 }
 
-bool InterpretBuiltin(InterpState &S, CodePtr OpPC, const Function *F,
-                      const CallExpr *Call, uint32_t BuiltinID) {
+bool InterpretBuiltin(InterpState &S, CodePtr OpPC, const CallExpr *Call,
+                      uint32_t BuiltinID) {
   if (!S.getASTContext().BuiltinInfo.isConstantEvaluated(BuiltinID))
     return Invalid(S, OpPC);
 

clang/lib/AST/ByteCode/InterpFrame.cpp

@@ -111,8 +111,6 @@ static void print(llvm::raw_ostream &OS, const T &V, ASTContext &ASTCtx,
 }
 
 static bool shouldSkipInBacktrace(const Function *F) {
-  if (F->isBuiltin())
-    return true;
   if (F->isLambdaStaticInvoker())
     return true;
 

clang/lib/AST/ByteCode/Opcodes.td

@@ -213,9 +213,7 @@ def CallVirt : Opcode {
   let Args = [ArgFunction, ArgUint32];
 }
 
-def CallBI : Opcode {
-  let Args = [ArgFunction, ArgCallExpr, ArgUint32];
-}
+def CallBI : Opcode { let Args = [ArgCallExpr, ArgUint32]; }
 
 def CallPtr : Opcode {
   let Args = [ArgUint32, ArgCallExpr];