First steps toward a two stages new compiler.

runtime/vm/stub_code_x64.cc

 // Copyright (c) 2012, 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"
 #if defined(TARGET_ARCH_X64)
 
 #include "vm/code_generator.h"
 #include "vm/compiler.h"
 #include "vm/object_store.h"
 #include "vm/pages.h"
 #include "vm/resolver.h"
 #include "vm/scavenger.h"
 #include "vm/stub_code.h"
 
 
 #define __ assembler->
 
 namespace dart {
 
 DEFINE_FLAG(bool, inline_alloc, true, "Inline allocation of objects.");
 DEFINE_FLAG(bool, use_slow_path, false,
     "Set to true for debugging & verifying the slow paths.");
+DECLARE_FLAG(int, optimization_counter_threshold);
 
 // Input parameters:
 //   RSP : points to return address.
 //   RSP + 8 : address of last argument in argument array.
 //   RSP + 8*R10 : address of first argument in argument array.
 //   RSP + 8*R10 + 8 : address of return value.
 //   RBX : address of the runtime function to call.
 //   R10 : number of arguments to the call.
 // Must preserve callee saved registers R12 and R13.
 void StubCode::GenerateCallToRuntimeStub(Assembler* assembler) {
@@ skipping 211 matching lines @@
   __ addq(RBX, Immediate(Instructions::HeaderSize() - kHeapObjectTag));
   __ jmp(RBX);
 }
 
 
 // Called from a static call only when an invalid code has been entered
 // (invalid because its function was optimized or deoptimized).
 // RBX: function object.
 // R10: arguments descriptor array (num_args is first Smi element).
 void StubCode::GenerateFixCallersTargetStub(Assembler* assembler) {
-  __ Untested("FixCallersTarget stub");
   __ EnterFrame(0);
   __ pushq(R10);  // Preserve arguments descriptor array.
   __ pushq(RBX);  // Preserve target function.
   __ pushq(RBX);  // Target function.
   __ CallRuntime(kFixCallersTargetRuntimeEntry);
   __ popq(RAX);  // discard argument.
   __ popq(RAX);  // Restore function.
   __ popq(R10);  // Restore arguments descriptor array.
   __ movq(RAX, FieldAddress(RAX, Function::code_offset()));
   __ movq(RAX, FieldAddress(RAX, Code::instructions_offset()));
@@ skipping 1244 matching lines @@
 //  TOS(0): return address
 // Control flow:
 // - If receiver is null -> jump to IC miss.
 // - If receiver is Smi -> load Smi class.
 // - If receiver is not-Smi -> load receiver's class.
 // - Check if 'num_args' (including receiver) match any IC data group.
 // - Match found -> jump to target.
 // - Match not found -> jump to IC miss.
 void StubCode::GenerateNArgsCheckInlineCacheStub(Assembler* assembler,
                                                  intptr_t num_args) {
-  // TODO(srdjan): Add usage counter increment and test (see ia32).
+  __ movq(RCX, FieldAddress(RBX, ICData::function_offset()));
+  __ incq(FieldAddress(RCX, Function::usage_counter_offset()));
+  if (CodeGenerator::CanOptimize()) {
+    __ cmpq(FieldAddress(RCX, Function::usage_counter_offset()),
+        Immediate(FLAG_optimization_counter_threshold));
+    Label not_yet_hot;
+    __ j(LESS_EQUAL, &not_yet_hot, Assembler::kNearJump);
+    __ EnterFrame(0);
+    __ pushq(RBX);  // Preserve inline cache data object.
+    __ pushq(R10);  // Preserve arguments array.
+    __ pushq(RCX);  // Argument for runtime: function object.
+    __ CallRuntime(kOptimizeInvokedFunctionRuntimeEntry);
+    __ popq(RCX);  // Remove argument.
+    __ popq(R10);  // Restore arguments array.
+    __ popq(RBX);  // Restore inline cache data object.
+    __ LeaveFrame();
+    __ Bind(&not_yet_hot);
+  }
   ASSERT(num_args > 0);
   // Get receiver (first read number of arguments from argument descriptor array
   // and then access the receiver from the stack).
   __ movq(RAX, FieldAddress(R10, Array::data_offset()));
   __ movq(RAX, Address(RSP, RAX, TIMES_4, 0));  // RAX (argument count) is Smi.
 
   Label get_class, ic_miss;
   __ call(&get_class);
   // RAX: receiver's class
   // RBX: IC data array.
@@ skipping 201 matching lines @@
   __ Unimplemented("Subtype2TestCache Stub");
 }
 
 void StubCode::GenerateSubtype3TestCacheStub(Assembler* assembler) {
   __ Unimplemented("Subtype3TestCache Stub");
 }
 
 }  // namespace dart
 
 #endif  // defined TARGET_ARCH_X64