VM: Implement closure calls as instance calls.

runtime/vm/stub_code_arm.cc

Index: runtime/vm/stub_code_arm.cc
===================================================================
--- runtime/vm/stub_code_arm.cc	(revision 34916)
+++ runtime/vm/stub_code_arm.cc	(working copy)
@@ -729,83 +729,6 @@
 }
 
 
-// Input parameters:
-//   LR: return address.
-//   SP: address of last argument.
-//   R4: arguments descriptor array.
-// Note: The closure object is the first argument to the function being
-//       called, the stub accesses the closure from this location directly
-//       when trying to resolve the call.
-void StubCode::GenerateCallClosureFunctionStub(Assembler* assembler) {
-  // Load num_args.
-  __ ldr(R0, FieldAddress(R4, ArgumentsDescriptor::count_offset()));
-  __ sub(R0, R0, ShifterOperand(Smi::RawValue(1)));
-  // Load closure object in R1.
-  __ ldr(R1, Address(SP, R0, LSL, 1));  // R0 (num_args - 1) is a Smi.
-
-  // Verify that R1 is a closure by checking its class.
-  Label not_closure;
-  __ LoadImmediate(R8, reinterpret_cast<intptr_t>(Object::null()));
-  __ cmp(R1, ShifterOperand(R8));
-  // Not a closure, but null object.
-  __ b(&not_closure, EQ);
-  __ tst(R1, ShifterOperand(kSmiTagMask));
-  __ b(&not_closure, EQ);  // Not a closure, but a smi.
-  // Verify that the class of the object is a closure class by checking that
-  // class.signature_function() is not null.
-  __ LoadClass(R0, R1, R2);
-  __ ldr(R0, FieldAddress(R0, Class::signature_function_offset()));
-  __ cmp(R0, ShifterOperand(R8));  // R8 is raw null.
-  // Actual class is not a closure class.
-  __ b(&not_closure, EQ);
-
-  // R0 is just the signature function. Load the actual closure function.
-  __ ldr(R0, FieldAddress(R1, Closure::function_offset()));
-
-  // Load closure context in CTX; note that CTX has already been preserved.
-  __ ldr(CTX, FieldAddress(R1, Closure::context_offset()));
-
-  // R4: Arguments descriptor.
-  // R0: Function.
-  __ ldr(R2, FieldAddress(R0, Function::code_offset()));
-
-  // R2: code.
-  // R5: Smi 0 (no IC data; the lazy-compile stub expects a GC-safe value).
-  __ LoadImmediate(R5, 0);
-  __ ldr(R2, FieldAddress(R2, Code::instructions_offset()));
-  __ AddImmediate(R2, Instructions::HeaderSize() - kHeapObjectTag);
-  __ bx(R2);
-
-  __ Bind(&not_closure);
-  // Call runtime to attempt to resolve and invoke a call method on a
-  // non-closure object, passing the non-closure object and its arguments array,
-  // returning here.
-  // If no call method exists, throw a NoSuchMethodError.
-  // R1: non-closure object.
-  // R4: arguments descriptor array.
-
-  // Create a stub frame as we are pushing some objects on the stack before
-  // calling into the runtime.
-  __ EnterStubFrame();
-
-  // Setup space on stack for result from error reporting.
-  __ PushList((1 << R4) | (1 << R8));  // Arguments descriptor and raw null.
-
-  // Load smi-tagged arguments array length, including the non-closure.
-  __ ldr(R2, FieldAddress(R4, ArgumentsDescriptor::count_offset()));
-  PushArgumentsArray(assembler);
-
-  __ CallRuntime(kInvokeNonClosureRuntimeEntry, 2);
-  // Remove arguments.
-  __ Drop(2);
-  __ Pop(R0);  // Get result into R0.
-
-  // Remove the stub frame as we are about to return.
-  __ LeaveStubFrame();
-  __ Ret();
-}
-
-
 // Called when invoking Dart code from C++ (VM code).
 // Input parameters:
 //   LR : points to return address.