Fix TryICData to create ICData with a valid arguments decriptor.

runtime/vm/flow_graph_compiler_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/flow_graph_compiler.h"
 
 #include "vm/ast_printer.h"
@@ skipping 1256 matching lines @@
 }
 
 
 void FlowGraphCompiler::EmitOptimizedInstanceCall(
     ExternalLabel* target_label,
     const ICData& ic_data,
     intptr_t argument_count,
     intptr_t deopt_id,
     intptr_t token_pos,
     LocationSummary* locs) {
+  ASSERT(Array::Handle(ic_data.arguments_descriptor()).Length() > 0);
   // Each ICData propagated from unoptimized to optimized code contains the
   // function that corresponds to the Dart function of that IC call. Due
   // to inlining in optimized code, that function may not correspond to the
   // top-level function (parsed_function().function()) which could be
   // reoptimized and which counter needs to be incremented.
   // Pass the function explicitly, it is used in IC stub.
   __ LoadObject(RDI, parsed_function().function(), PP);
   __ LoadObject(RBX, ic_data, PP);
   GenerateDartCall(deopt_id,
                    token_pos,
                    target_label,
                    PcDescriptors::kIcCall,
                    locs);
   __ Drop(argument_count);
 }
 
 
 void FlowGraphCompiler::EmitInstanceCall(ExternalLabel* target_label,
                                          const ICData& ic_data,
                                          intptr_t argument_count,
                                          intptr_t deopt_id,
                                          intptr_t token_pos,
                                          LocationSummary* locs) {
+  ASSERT(Array::Handle(ic_data.arguments_descriptor()).Length() > 0);
   __ LoadObject(RBX, ic_data, PP);
   GenerateDartCall(deopt_id,
                    token_pos,
                    target_label,
                    PcDescriptors::kIcCall,
                    locs);
   __ Drop(argument_count);
 }
 
 
 void FlowGraphCompiler::EmitMegamorphicInstanceCall(
     const ICData& ic_data,
     intptr_t argument_count,
     intptr_t deopt_id,
     intptr_t token_pos,
     LocationSummary* locs) {
   MegamorphicCacheTable* table = Isolate::Current()->megamorphic_cache_table();
   const String& name = String::Handle(ic_data.target_name());
   const Array& arguments_descriptor =
       Array::ZoneHandle(ic_data.arguments_descriptor());
-  ASSERT(!arguments_descriptor.IsNull());
+  ASSERT(!arguments_descriptor.IsNull() && (arguments_descriptor.Length() > 0));
   const MegamorphicCache& cache =
       MegamorphicCache::ZoneHandle(table->Lookup(name, arguments_descriptor));
   Label not_smi, load_cache;
   __ movq(RAX, Address(RSP, (argument_count - 1) * kWordSize));
   __ testq(RAX, Immediate(kSmiTagMask));
   __ j(NOT_ZERO, &not_smi, Assembler::kNearJump);
   __ LoadImmediate(RAX, Immediate(Smi::RawValue(kSmiCid)), PP);
   __ jmp(&load_cache);
 
   __ Bind(&not_smi);
@@ skipping 491 matching lines @@
   __ movups(reg, Address(RSP, 0));
   __ AddImmediate(RSP, Immediate(kFpuRegisterSize), PP);
 }
 
 
 #undef __
 
 }  // namespace dart
 
 #endif  // defined TARGET_ARCH_X64