Allow implicit 'close your eyes' of native methods. This will hopefully fix issue 3466.

vm/flow_graph_compiler_ia32.cc

Index: vm/flow_graph_compiler_ia32.cc
===================================================================
--- vm/flow_graph_compiler_ia32.cc	(revision 8699)
+++ vm/flow_graph_compiler_ia32.cc	(working copy)
@@ -82,6 +82,8 @@
 
 void FlowGraphCompiler::CopyParameters() {
   const Function& function = parsed_function().function();
+  const bool is_implicit_native_closure =
+      function.is_native() && function.IsImplicitClosureFunction();

[regis, 2012/06/15 17:13:34]

ditto

[siva, 2012/06/16 00:25:43]

Done.

   LocalScope* scope = parsed_function().node_sequence()->scope();
   const int num_fixed_params = function.num_fixed_parameters();
   const int num_opt_params = function.num_optional_parameters();
@@ -110,9 +112,17 @@
   // fp[1 + num_args - (num_pos_args - 1)].
   __ subl(EBX, ECX);
   __ leal(EBX, Address(EBP, EBX, TIMES_2, 2 * kWordSize));
+
   // Let EDI point to the last copied positional argument, i.e. to
   // fp[ParsedFunction::kFirstLocalSlotIndex - (num_pos_args - 1)].
-  const int index = ParsedFunction::kFirstLocalSlotIndex + 1;
+  int implicit_this_param_pos = is_implicit_native_closure ? -1 : 0;
+  const int index =
+      ParsedFunction::kFirstLocalSlotIndex + 1 + implicit_this_param_pos;
+  // First copy captured receiver if function is an implicit native closure.
+  if (is_implicit_native_closure) {
+    __ movl(EAX, FieldAddress(CTX, Context::variable_offset(0)));
+    __ movl(Address(EBP, (index * kWordSize)), EAX);
+  }
   __ leal(EDI, Address(EBP, (index * kWordSize)));
   __ subl(EDI, ECX);  // ECX is a Smi, subtract twice for TIMES_4 scaling.
   __ subl(EDI, ECX);
@@ -132,79 +142,84 @@
   __ j(POSITIVE, &loop, Assembler::kNearJump);
 
   // Copy or initialize optional named arguments.
-  ASSERT(num_opt_params > 0);  // Or we would not have to copy arguments.
-  // Start by alphabetically sorting the names of the optional parameters.
-  LocalVariable** opt_param = new LocalVariable*[num_opt_params];
-  int* opt_param_position = new int[num_opt_params];
-  for (int pos = num_fixed_params; pos < num_params; pos++) {
-    LocalVariable* parameter = scope->VariableAt(pos);
-    const String& opt_param_name = parameter->name();
-    int i = pos - num_fixed_params;
-    while (--i >= 0) {
-      LocalVariable* param_i = opt_param[i];
-      const intptr_t result = opt_param_name.CompareTo(param_i->name());
-      ASSERT(result != 0);
-      if (result > 0) break;
-      opt_param[i + 1] = opt_param[i];
-      opt_param_position[i + 1] = opt_param_position[i];
+  Label all_arguments_processed;
+  const Immediate raw_null =
+      Immediate(reinterpret_cast<intptr_t>(Object::null()));
+  if (num_opt_params > 0) {
+    // Start by alphabetically sorting the names of the optional parameters.
+    LocalVariable** opt_param = new LocalVariable*[num_opt_params];
+    int* opt_param_position = new int[num_opt_params];
+    for (int pos = num_fixed_params; pos < num_params; pos++) {
+      LocalVariable* parameter = scope->VariableAt(pos);
+      const String& opt_param_name = parameter->name();
+      int i = pos - num_fixed_params;
+      while (--i >= 0) {
+        LocalVariable* param_i = opt_param[i];
+        const intptr_t result = opt_param_name.CompareTo(param_i->name());
+        ASSERT(result != 0);
+        if (result > 0) break;
+        opt_param[i + 1] = opt_param[i];
+        opt_param_position[i + 1] = opt_param_position[i];
+      }
+      opt_param[i + 1] = parameter;
+      opt_param_position[i + 1] = pos;
     }
-    opt_param[i + 1] = parameter;
-    opt_param_position[i + 1] = pos;
+    // Generate code handling each optional parameter in alphabetical order.
+    // Total number of args is the first Smi in args descriptor array (EDX).
+    __ movl(EBX, FieldAddress(EDX, Array::data_offset()));
+    // Number of positional args is the second Smi in descriptor array (EDX).
+    __ movl(ECX, FieldAddress(EDX, Array::data_offset() + (1 * kWordSize)));
+    __ SmiUntag(ECX);
+    // Let EBX point to the first passed argument, i.e. to fp[1 + argc - 0].
+    __ leal(EBX, Address(EBP, EBX, TIMES_2, kWordSize));  // EBX is Smi.
+    // Let EDI point to the name/pos pair of the first named argument.
+    __ leal(EDI, FieldAddress(EDX, Array::data_offset() + (2 * kWordSize)));
+    for (int i = 0; i < num_opt_params; i++) {
+      // Handle this optional parameter only if k or fewer positional arguments
+      // have been passed, where k is the position of this optional parameter in
+      // the formal parameter list.
+      Label load_default_value, assign_optional_parameter, next_parameter;
+      const int param_pos = opt_param_position[i];
+      __ cmpl(ECX, Immediate(param_pos));
+      __ j(GREATER, &next_parameter, Assembler::kNearJump);
+      // Check if this named parameter was passed in.
+      __ movl(EAX, Address(EDI, 0));  // Load EAX with the name of the argument.
+      __ CompareObject(EAX, opt_param[i]->name());
+      __ j(NOT_EQUAL, &load_default_value, Assembler::kNearJump);
+      // Load EAX with passed-in argument at provided arg_pos, i.e. at
+      // fp[1 + argc - arg_pos].
+      __ movl(EAX, Address(EDI, kWordSize));  // EAX is arg_pos as Smi.
+      __ addl(EDI, Immediate(2 * kWordSize));  // Point to next name/pos pair.
+      __ negl(EAX);
+      Address argument_addr(EBX, EAX, TIMES_2, 0);  // EAX is a negative Smi.
+      __ movl(EAX, argument_addr);
+      __ jmp(&assign_optional_parameter, Assembler::kNearJump);
+      __ Bind(&load_default_value);
+      // Load EAX with default argument at pos.
+      const Object& value = Object::ZoneHandle(
+          parsed_function().default_parameter_values().At(
+              param_pos - num_fixed_params));
+      __ LoadObject(EAX, value);
+      __ Bind(&assign_optional_parameter);
+      // Assign EAX to fp[ParsedFunction::kFirstLocalSlotIndex - param_pos].
+      // We do not use the final allocation index of the variable here, i.e.
+      // scope->VariableAt(i)->index(), because captured variables still need
+      // to be copied to the context that is not yet allocated.
+      intptr_t computed_param_pos = (ParsedFunction::kFirstLocalSlotIndex -
+                                     param_pos + implicit_this_param_pos);
+      const Address param_addr(EBP, (computed_param_pos * kWordSize));
+      __ movl(param_addr, EAX);
+      __ Bind(&next_parameter);
+    }
+    delete[] opt_param;
+    delete[] opt_param_position;
+    // Check that EDI now points to the null terminator in the array descriptor.
+    __ cmpl(Address(EDI, 0), raw_null);
+    __ j(EQUAL, &all_arguments_processed, Assembler::kNearJump);
+  } else {
+    ASSERT(is_implicit_native_closure);
+    __ jmp(&all_arguments_processed, Assembler::kNearJump);
   }
-  // Generate code handling each optional parameter in alphabetical order.
-  // Total number of args is the first Smi in args descriptor array (EDX).
-  __ movl(EBX, FieldAddress(EDX, Array::data_offset()));
-  // Number of positional args is the second Smi in descriptor array (EDX).
-  __ movl(ECX, FieldAddress(EDX, Array::data_offset() + (1 * kWordSize)));
-  __ SmiUntag(ECX);
-  // Let EBX point to the first passed argument, i.e. to fp[1 + argc - 0].
-  __ leal(EBX, Address(EBP, EBX, TIMES_2, kWordSize));  // EBX is Smi.
-  // Let EDI point to the name/pos pair of the first named argument.
-  __ leal(EDI, FieldAddress(EDX, Array::data_offset() + (2 * kWordSize)));
-  for (int i = 0; i < num_opt_params; i++) {
-    // Handle this optional parameter only if k or fewer positional arguments
-    // have been passed, where k is the position of this optional parameter in
-    // the formal parameter list.
-    Label load_default_value, assign_optional_parameter, next_parameter;
-    const int param_pos = opt_param_position[i];
-    __ cmpl(ECX, Immediate(param_pos));
-    __ j(GREATER, &next_parameter, Assembler::kNearJump);
-    // Check if this named parameter was passed in.
-    __ movl(EAX, Address(EDI, 0));  // Load EAX with the name of the argument.
-    __ CompareObject(EAX, opt_param[i]->name());
-    __ j(NOT_EQUAL, &load_default_value, Assembler::kNearJump);
-    // Load EAX with passed-in argument at provided arg_pos, i.e. at
-    // fp[1 + argc - arg_pos].
-    __ movl(EAX, Address(EDI, kWordSize));  // EAX is arg_pos as Smi.
-    __ addl(EDI, Immediate(2 * kWordSize));  // Point to next name/pos pair.
-    __ negl(EAX);
-    Address argument_addr(EBX, EAX, TIMES_2, 0);  // EAX is a negative Smi.
-    __ movl(EAX, argument_addr);
-    __ jmp(&assign_optional_parameter, Assembler::kNearJump);
-    __ Bind(&load_default_value);
-    // Load EAX with default argument at pos.
-    const Object& value = Object::ZoneHandle(
-        parsed_function().default_parameter_values().At(
-            param_pos - num_fixed_params));
-    __ LoadObject(EAX, value);
-    __ Bind(&assign_optional_parameter);
-    // Assign EAX to fp[ParsedFunction::kFirstLocalSlotIndex - param_pos].
-    // We do not use the final allocation index of the variable here, i.e.
-    // scope->VariableAt(i)->index(), because captured variables still need
-    // to be copied to the context that is not yet allocated.
-    const Address param_addr(
-        EBP, (ParsedFunction::kFirstLocalSlotIndex - param_pos) * kWordSize);
-    __ movl(param_addr, EAX);
-    __ Bind(&next_parameter);
-  }
-  delete[] opt_param;
-  delete[] opt_param_position;
-  // Check that EDI now points to the null terminator in the array descriptor.
-  const Immediate raw_null =
-      Immediate(reinterpret_cast<intptr_t>(Object::null()));
-  Label all_arguments_processed;
-  __ cmpl(Address(EDI, 0), raw_null);
-  __ j(EQUAL, &all_arguments_processed, Assembler::kNearJump);
 
   __ Bind(&wrong_num_arguments);
   if (StackSize() != 0) {