Check for a passed-in type argument vector in the prolog of generic functions.

runtime/vm/flow_graph_compiler_arm64.cc

 // Copyright (c) 2014, 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_ARM64.
 #if defined(TARGET_ARCH_ARM64)
 
 #include "vm/flow_graph_compiler.h"
 
 #include "vm/ast_printer.h"
@@ skipping 1053 matching lines @@
           __ LoadObject(R1, Object::empty_context());
           __ StoreToOffset(R1, FP, (slot_base - i) * kWordSize);
         }
       } else {
         ASSERT(num_locals > 1);
         __ StoreToOffset(R0, FP, (slot_base - i) * kWordSize);
       }
     }
   }
 
+  // Check for a passed type argument vector if the function is generic.
+  if (FLAG_reify_generic_functions && function.IsGeneric()) {
+    __ Comment("Check passed-in type args");
+    Label store_type_args, ok;
+    __ LoadFieldFromOffset(R0, R4, ArgumentsDescriptor::type_args_len_offset());
+    __ CompareImmediate(R0, 0);
+    if (is_optimizing()) {
+      // Initialize type_args to null if none passed in.
+      __ LoadObject(R0, Object::null_object());
+      __ b(&store_type_args, EQ);
+    } else {
+      __ b(&ok, EQ);  // Already initialized to null.
+    }
+    // TODO(regis): Verify that type_args_len is correct.
+    // Load the passed type args vector in R0 from
+    // fp[kParamEndSlotFromFp + num_args + 1]; num_args (R1) is Smi.
+    __ LoadFieldFromOffset(R1, R4, ArgumentsDescriptor::count_offset());
+    __ add(R1, FP, Operand(R1, LSL, 2));
+    __ LoadFromOffset(R0, R1, (kParamEndSlotFromFp + 1) * kWordSize);
+    // Store R0 into the stack slot reserved for the function type arguments.
+    // If the function type arguments variable is captured, a copy will happen
+    // after the context is allocated.
+    const intptr_t slot_base = parsed_function().first_stack_local_index();
+    ASSERT(parsed_function().function_type_arguments()->is_captured() ||
+           parsed_function().function_type_arguments()->index() == slot_base);
+    __ Bind(&store_type_args);
+    __ StoreToOffset(R0, FP, slot_base * kWordSize);
+    __ Bind(&ok);
+  }
+
+  // TODO(regis): Verify that no vector is passed if not generic, unless already
+  // checked during resolution.
+
   EndCodeSourceRange(TokenPosition::kDartCodePrologue);
   VisitBlocks();
 
   __ brk(0);
   ASSERT(assembler()->constant_pool_allowed());
   GenerateDeferredCode();
 }
 
 
 void FlowGraphCompiler::GenerateCall(TokenPosition token_pos,
@@ skipping 228 matching lines @@
 
 
 void FlowGraphCompiler::EmitOptimizedStaticCall(
     const Function& function,
     const Array& arguments_descriptor,
     intptr_t argument_count,
     intptr_t deopt_id,
     TokenPosition token_pos,
     LocationSummary* locs) {
   ASSERT(!function.IsClosureFunction());
-  if (function.HasOptionalParameters()) {
+  if (function.HasOptionalParameters() ||
+      (FLAG_reify_generic_functions && function.IsGeneric())) {
     __ LoadObject(R4, arguments_descriptor);
   } else {
     __ LoadImmediate(R4, 0);  // GC safe smi zero because of stub.
   }
   // Do not use the code from the function, but let the code be patched so that
   // we can record the outgoing edges to other code.
   GenerateStaticDartCall(deopt_id, token_pos,
                          *StubCode::CallStaticFunction_entry(),
                          RawPcDescriptors::kOther, locs, function);
   __ Drop(argument_count);
@@ skipping 433 matching lines @@
 void ParallelMoveResolver::RestoreFpuScratch(FpuRegister reg) {
   __ PopDouble(reg);
 }
 
 
 #undef __
 
 }  // namespace dart
 
 #endif  // defined TARGET_ARCH_ARM64