Store arguments descriptor in ICData. Remove loading of arguments descriptor at unoptimized call si…

runtime/vm/intermediate_language_x64.cc

 // Copyright (c) 2013, the Dart project authors.  Please see the AUTHORS file
 // for details. All rights reserved. Use of this source code is governed by a
 // BSD-style license that can be found in the LICENSE file.
 
 #include "vm/globals.h"  // Needed here to get TARGET_ARCH_X64.
 #if defined(TARGET_ARCH_X64)
 
 #include "vm/intermediate_language.h"
 
 #include "lib/error.h"
@@ skipping 256 matching lines @@
     __ subq(RDX, Immediate(1));
     __ andq(RDX, Immediate(
         Smi::RawValue(true_value) - Smi::RawValue(false_value)));
     if (false_value != 0) {
       __ addq(RDX, Immediate(Smi::RawValue(false_value)));
     }
   }
 }
 
 
-LocationSummary* ClosureCallInstr::MakeLocationSummary() const {
-  const intptr_t kNumInputs = 0;
-  const intptr_t kNumTemps = 1;
-  LocationSummary* result =
-      new LocationSummary(kNumInputs, kNumTemps, LocationSummary::kCall);
-  result->set_out(Location::RegisterLocation(RAX));
-  result->set_temp(0, Location::RegisterLocation(R10));  // Arg. descriptor.
-  return result;
-}
-
-
 LocationSummary* LoadLocalInstr::MakeLocationSummary() const {
   const intptr_t kNumInputs = 0;
   return LocationSummary::Make(kNumInputs,
                                Location::RequiresRegister(),
                                LocationSummary::kNoCall);
 }
 
 
 void LoadLocalInstr::EmitNativeCode(FlowGraphCompiler* compiler) {
   Register result = locs()->out().reg();
@@ skipping 197 matching lines @@
                                        intptr_t token_pos,
                                        Token::Kind kind,
                                        LocationSummary* locs,
                                        const ICData& original_ic_data) {
   if (!compiler->is_optimizing()) {
     compiler->AddCurrentDescriptor(PcDescriptors::kDeopt,
                                    deopt_id,
                                    token_pos);
   }
   const int kNumberOfArguments = 2;
-  const Array& kNoArgumentNames = Array::Handle();
+  const Array& kNoArgumentNames = Object::null_array();
   const int kNumArgumentsChecked = 2;
 
   const Immediate& raw_null =
       Immediate(reinterpret_cast<intptr_t>(Object::null()));
   Label check_identity;
   __ cmpq(Address(RSP, 0 * kWordSize), raw_null);
   __ j(EQUAL, &check_identity);
   __ cmpq(Address(RSP, 1 * kWordSize), raw_null);
   __ j(EQUAL, &check_identity);
 
   ICData& equality_ic_data = ICData::ZoneHandle(original_ic_data.raw());
   if (compiler->is_optimizing() && FLAG_propagate_ic_data) {
     ASSERT(!original_ic_data.IsNull());
     if (original_ic_data.NumberOfChecks() == 0) {
       // IC call for reoptimization populates original ICData.
       equality_ic_data = original_ic_data.raw();
     } else {
       // Megamorphic call.
       equality_ic_data = original_ic_data.AsUnaryClassChecks();
     }
   } else {
+    const Array& arguments_descriptor =
+        Array::Handle(ArgumentsDescriptor::New(kNumberOfArguments,
+                                               kNoArgumentNames));
     equality_ic_data = ICData::New(compiler->parsed_function().function(),
                                    Symbols::EqualOperator(),
+                                   arguments_descriptor,
                                    deopt_id,
                                    kNumArgumentsChecked);
   }
   compiler->GenerateInstanceCall(deopt_id,
                                  token_pos,
                                  kNumberOfArguments,
                                  kNoArgumentNames,
                                  locs,
                                  equality_ic_data);
   Label check_ne;
@@ skipping 107 matching lines @@
         Register result = locs->out().reg();
         Label load_true;
         __ j(cond, &load_true, Assembler::kNearJump);
         __ LoadObject(result, Bool::False());
         __ jmp(&done);
         __ Bind(&load_true);
         __ LoadObject(result, Bool::True());
       }
     } else {
       const int kNumberOfArguments = 2;
-      const Array& kNoArgumentNames = Array::Handle();
+      const Array& kNoArgumentNames = Object::null_array();
       compiler->GenerateStaticCall(deopt_id,
                                    token_pos,
                                    target,
                                    kNumberOfArguments,
                                    kNoArgumentNames,
                                    locs);
       if (branch == NULL) {
         if (kind == Token::kNE) {
           Label false_label;
           __ CompareObject(RAX, Bool::True());
@@ skipping 339 matching lines @@
     Label* deopt = compiler->AddDeoptStub(deopt_id(), kDeoptRelationalOp);
 
     // Load class into RDI. Since this is a call, any register except
     // the fixed input registers would be ok.
     ASSERT((left != RDI) && (right != RDI));
     LoadValueCid(compiler, RDI, left);
     const intptr_t kNumArguments = 2;
     compiler->EmitTestAndCall(ICData::Handle(ic_data()->AsUnaryClassChecks()),
                               RDI,  // Class id register.
                               kNumArguments,
-                              Array::Handle(),  // No named arguments.
+                              Object::null_array(),  // No named arguments.
                               deopt,  // Deoptimize target.
                               deopt_id(),
                               token_pos(),
                               locs());
     return;
   }
   const String& function_name =
       String::ZoneHandle(Symbols::New(Token::Str(kind())));
   if (!compiler->is_optimizing()) {
     compiler->AddCurrentDescriptor(PcDescriptors::kDeopt,
                                    deopt_id(),
                                    token_pos());
   }
   const intptr_t kNumArguments = 2;
   const intptr_t kNumArgsChecked = 2;  // Type-feedback.
   ICData& relational_ic_data = ICData::ZoneHandle(ic_data()->raw());
   if (compiler->is_optimizing() && FLAG_propagate_ic_data) {
     ASSERT(!ic_data()->IsNull());
     if (ic_data()->NumberOfChecks() == 0) {
       // IC call for reoptimization populates original ICData.
       relational_ic_data = ic_data()->raw();
     } else {
       // Megamorphic call.
       relational_ic_data = ic_data()->AsUnaryClassChecks();
     }
   } else {
+    const Array& arguments_descriptor =
+        Array::Handle(ArgumentsDescriptor::New(kNumArguments,
+                                               Object::null_array()));
     relational_ic_data = ICData::New(compiler->parsed_function().function(),
                                      function_name,
+                                     arguments_descriptor,
                                      deopt_id(),
                                      kNumArgsChecked);
   }
   compiler->GenerateInstanceCall(deopt_id(),
                                  token_pos(),
                                  kNumArguments,
-                                 Array::ZoneHandle(),  // No optional arguments.
+                                 Object::null_array(),  // No optional args.
                                  locs(),
                                  relational_ic_data);
 }
 
 
 void RelationalOpInstr::EmitBranchCode(FlowGraphCompiler* compiler,
                                        BranchInstr* branch) {
   if (operands_class_id() == kSmiCid) {
     EmitSmiComparisonOp(compiler, *locs(), kind(), branch);
     return;
@@ skipping 2725 matching lines @@
   const ICData& ic_data = *instance_call()->ic_data();
   ASSERT((ic_data.NumberOfChecks() == 1));
   const Function& target = Function::ZoneHandle(ic_data.GetTargetAt(0));
 
   const intptr_t kNumberOfArguments = 1;
   __ pushq(value_obj);
   compiler->GenerateStaticCall(deopt_id(),
                                instance_call()->token_pos(),
                                target,
                                kNumberOfArguments,
-                               Array::Handle(),  // No argument names.
+                               Object::null_array(),  // No argument names.
                                locs());
   __ Bind(&done);
 }
 
 
 LocationSummary* DoubleToSmiInstr::MakeLocationSummary() const {
   const intptr_t kNumInputs = 1;
   const intptr_t kNumTemps = 1;
   LocationSummary* result = new LocationSummary(
       kNumInputs, kNumTemps, LocationSummary::kNoCall);
@@ skipping 506 matching lines @@
                                         right.reg(),
                                         needs_number_check(),
                                         token_pos());
   }
 
   Condition true_condition = (kind() == Token::kEQ_STRICT) ? EQUAL : NOT_EQUAL;
   branch->EmitBranchOnCondition(compiler, true_condition);
 }
 
 
+LocationSummary* ClosureCallInstr::MakeLocationSummary() const {
+  const intptr_t kNumInputs = 0;
+  const intptr_t kNumTemps = 1;
+  LocationSummary* result =
+      new LocationSummary(kNumInputs, kNumTemps, LocationSummary::kCall);
+  result->set_out(Location::RegisterLocation(RAX));
+  result->set_temp(0, Location::RegisterLocation(R10));  // Arg. descriptor.
+  return result;
+}
+
+
 void ClosureCallInstr::EmitNativeCode(FlowGraphCompiler* compiler) {
   // The arguments to the stub include the closure, as does the arguments
   // descriptor.
   Register temp_reg = locs()->temp(0).reg();
   int argument_count = ArgumentCount();
   const Array& arguments_descriptor =
       Array::ZoneHandle(ArgumentsDescriptor::New(argument_count,
                                                  argument_names()));
   __ LoadObject(temp_reg, arguments_descriptor);
+  ASSERT(temp_reg == R10);
   compiler->GenerateDartCall(deopt_id(),
                              token_pos(),
                              &StubCode::CallClosureFunctionLabel(),
                              PcDescriptors::kClosureCall,
                              locs());
   __ Drop(argument_count);
 }
 
 
 LocationSummary* BooleanNegateInstr::MakeLocationSummary() const {
@@ skipping 94 matching lines @@
                          PcDescriptors::kOther,
                          locs());
   __ Drop(2);  // Discard type arguments and receiver.
 }
 
 }  // namespace dart
 
 #undef __
 
 #endif  // defined TARGET_ARCH_X64