[Interpreter] Add dispatch counters for each bytecode.

src/interpreter/interpreter-assembler.cc

 // Copyright 2015 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.
 
 #include "src/interpreter/interpreter-assembler.h"
 
+#include <limits>
 #include <ostream>
 
 #include "src/code-factory.h"
 #include "src/frames.h"
 #include "src/interface-descriptors.h"
 #include "src/interpreter/bytecodes.h"
 #include "src/interpreter/interpreter.h"
 #include "src/machine-type.h"
 #include "src/macro-assembler.h"
 #include "src/zone.h"
@@ skipping 19 matching lines @@
       disable_stack_check_across_call_(false),
       stack_pointer_before_call_(nullptr) {
   accumulator_.Bind(
       Parameter(InterpreterDispatchDescriptor::kAccumulatorParameter));
   context_.Bind(Parameter(InterpreterDispatchDescriptor::kContextParameter));
   bytecode_array_.Bind(
       Parameter(InterpreterDispatchDescriptor::kBytecodeArrayParameter));
   if (FLAG_trace_ignition) {
     TraceBytecode(Runtime::kInterpreterTraceBytecodeEntry);
   }
+  if (FLAG_trace_ignition_dispatches) {
+    TraceBytecodeDispatch();
+  }
 }
 
 InterpreterAssembler::~InterpreterAssembler() {}
 
 Node* InterpreterAssembler::GetAccumulator() { return accumulator_.value(); }
 
 void InterpreterAssembler::SetAccumulator(Node* value) {
   accumulator_.Bind(value);
 }
 
@@ skipping 594 matching lines @@
   Bind(&match);
   Goto(&end);
   Bind(&end);
 }
 
 void InterpreterAssembler::TraceBytecode(Runtime::FunctionId function_id) {
   CallRuntime(function_id, GetContext(), BytecodeArrayTaggedPointer(),
               SmiTag(BytecodeOffset()), GetAccumulator());
 }
 
+void InterpreterAssembler::TraceBytecodeDispatch() {
+  Node* counters = ExternalConstant(
+      ExternalReference::interpreter_dispatch_counters(isolate()));
+  Node* counter_offset =
+      IntPtrConstant(static_cast<int>(bytecode_) * sizeof(uintptr_t));
+  Node* old_counter = Load(MachineType::IntPtr(), counters, counter_offset);
+
+  CodeStubAssembler::Label counter_ok(this);
+  CodeStubAssembler::Label counter_saturated(this);
+  CodeStubAssembler::Label end(this);
+
+  Node* counter_reached_max = WordEqual(
+      old_counter, IntPtrConstant(std::numeric_limits<uintptr_t>::max()));
+  Branch(counter_reached_max, &counter_saturated, &counter_ok);
+  Bind(&counter_ok);
+  Node* new_counter = IntPtrAdd(old_counter, IntPtrConstant(1));
+  StoreNoWriteBarrier(kPointerSize == 8 ? MachineRepresentation::kWord64
+                                        : MachineRepresentation::kWord32,
+                      counters, counter_offset, new_counter);
+  Goto(&end);
+  Bind(&counter_saturated);
+  Goto(&end);
+  Bind(&end);
+}
+
 // static
 bool InterpreterAssembler::TargetSupportsUnalignedAccess() {
 #if V8_TARGET_ARCH_MIPS || V8_TARGET_ARCH_MIPS64
   return false;
 #elif V8_TARGET_ARCH_ARM || V8_TARGET_ARCH_ARM64 || V8_TARGET_ARCH_PPC
   return CpuFeatures::IsSupported(UNALIGNED_ACCESSES);
 #elif V8_TARGET_ARCH_IA32 || V8_TARGET_ARCH_X64 || V8_TARGET_ARCH_X87 || \
     V8_TARGET_ARCH_S390
   return true;
 #else
 #error "Unknown Architecture"
 #endif
 }
 
 }  // namespace interpreter
 }  // namespace internal
 }  // namespace v8