Collect edge count profiling data and reorder basic blocks.

runtime/vm/intermediate_language_ia32.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_IA32.
 #if defined(TARGET_ARCH_IA32)
 
 #include "vm/intermediate_language.h"
 
 #include "lib/error.h"
@@ skipping 4296 matching lines @@
 
 void ReThrowInstr::EmitNativeCode(FlowGraphCompiler* compiler) {
   compiler->GenerateCallRuntime(token_pos(),
                                 deopt_id(),
                                 kReThrowRuntimeEntry,
                                 locs());
   __ int3();
 }
 
 
+void TargetEntryInstr::EmitNativeCode(FlowGraphCompiler* compiler) {
+  __ Bind(compiler->GetJumpLabel(this));
+  if (!compiler->is_optimizing()) {
+    compiler->AddCurrentDescriptor(PcDescriptors::kDeopt,
+                                   deopt_id_,
+                                   Scanner::kDummyTokenIndex);
+    // Add an edge counter.

[srdjan, 2013/08/14 00:28:24]

I would add/use special counter objects, that way you would not by mistake grab
other objects in the code.

+    const Array& counter = Array::ZoneHandle(Array::New(1, Heap::kOld));
+    counter.SetAt(0, Smi::Handle(Smi::New(0)));
+    Label done;
+    __ Comment("Edge counter");
+    __ LoadObject(EAX, counter);
+    __ addl(FieldAddress(EAX, Array::element_offset(0)),
+            Immediate(Smi::RawValue(1)));
+    __ j(NO_OVERFLOW, &done);
+    __ movl(FieldAddress(EAX, Array::element_offset(0)),
+            Immediate(Smi::RawValue(Smi::kMaxValue)));
+    __ Bind(&done);
+  }
+  if (HasParallelMove()) {
+    compiler->parallel_move_resolver()->EmitNativeCode(parallel_move());
+  }
+}
+
+
 LocationSummary* GotoInstr::MakeLocationSummary() const {
   return new LocationSummary(0, 0, LocationSummary::kNoCall);
 }
 
 
 void GotoInstr::EmitNativeCode(FlowGraphCompiler* compiler) {
+  if (!compiler->is_optimizing()) {
+    // Add deoptimization descriptor for deoptimizing instructions that may
+    // be inserted before this instruction.
+    compiler->AddCurrentDescriptor(PcDescriptors::kDeopt,
+                                   GetDeoptId(),
+                                   0);  // No token position.
+    // Add an edge counter.
+    const Array& counter = Array::ZoneHandle(Array::New(1, Heap::kOld));
+    counter.SetAt(0, Smi::Handle(Smi::New(0)));
+    Label done;
+    __ Comment("Edge counter");
+    __ LoadObject(EAX, counter);
+    __ addl(FieldAddress(EAX, Array::element_offset(0)),
+            Immediate(Smi::RawValue(1)));
+    __ j(NO_OVERFLOW, &done);
+    __ movl(FieldAddress(EAX, Array::element_offset(0)),
+            Immediate(Smi::RawValue(Smi::kMaxValue)));
+    __ Bind(&done);
+  }
   if (HasParallelMove()) {
     compiler->parallel_move_resolver()->EmitNativeCode(parallel_move());
   }
 
   // We can fall through if the successor is the next block in the list.
   // Otherwise, we need a jump.
   if (!compiler->CanFallThroughTo(successor())) {
     __ jmp(compiler->GetJumpLabel(successor()));
   }
 }
@@ skipping 414 matching lines @@
                          PcDescriptors::kOther,
                          locs());
   __ Drop(2);  // Discard type arguments and receiver.
 }
 
 }  // namespace dart
 
 #undef __
 
 #endif  // defined TARGET_ARCH_IA32