[turbofan] Collect invocation counts and compute relative call frequencies.

src/full-codegen/arm/full-codegen-arm.cc

 // Copyright 2012 the V8 project authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #if V8_TARGET_ARCH_ARM
 
 #include "src/full-codegen/full-codegen.h"
 #include "src/ast/compile-time-value.h"
 #include "src/ast/scopes.h"
 #include "src/code-factory.h"
@@ skipping 110 matching lines @@
   }
 
   // Open a frame scope to indicate that there is a frame on the stack.  The
   // MANUAL indicates that the scope shouldn't actually generate code to set up
   // the frame (that is done below).
   FrameScope frame_scope(masm_, StackFrame::MANUAL);
 
   info->set_prologue_offset(masm_->pc_offset());
   __ Prologue(info->GeneratePreagedPrologue());
 
+  // Increment invocation count for the function.
+  __ ldr(r2, FieldMemOperand(r1, JSFunction::kLiteralsOffset));

[Michael Starzinger, 2016/09/14 07:53:45]

suggestion: We could even add a code comment (the ones visible in the
disassembly via --code-comments) for this block.

[mvstanton, 2016/09/14 09:26:09]

Let's certainly do so!

[Benedikt Meurer, 2016/09/14 10:55:44]

Done.

+  __ ldr(r2, FieldMemOperand(r2, LiteralsArray::kFeedbackVectorOffset));
+  __ ldr(r9, FieldMemOperand(
+                 r2, TypeFeedbackVector::kInvocationCountIndex * kPointerSize +
+                         TypeFeedbackVector::kHeaderSize));
+  __ add(r9, r9, Operand(Smi::FromInt(1)));
+  __ str(r9, FieldMemOperand(
+                 r2, TypeFeedbackVector::kInvocationCountIndex * kPointerSize +
+                         TypeFeedbackVector::kHeaderSize));
+
   { Comment cmnt(masm_, "[ Allocate locals");
     int locals_count = info->scope()->num_stack_slots();
     // Generators allocate locals, if any, in context slots.
     DCHECK(!IsGeneratorFunction(info->literal()->kind()) || locals_count == 0);
     OperandStackDepthIncrement(locals_count);
     if (locals_count > 0) {
       if (locals_count >= 128) {
         Label ok;
         __ sub(r9, sp, Operand(locals_count * kPointerSize));
         __ LoadRoot(r2, Heap::kRealStackLimitRootIndex);
@@ skipping 3634 matching lines @@
   DCHECK(interrupt_address ==
          isolate->builtins()->OnStackReplacement()->entry());
   return ON_STACK_REPLACEMENT;
 }
 
 
 }  // namespace internal
 }  // namespace v8
 
 #endif  // V8_TARGET_ARCH_ARM