src/oprofile-agent.cc

// Copyright 2006-2009 the V8 project authors. All rights reserved.
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#include "v8.h"

#include "oprofile-agent.h"

namespace v8 {
namespace internal {

#ifdef ENABLE_OPROFILE_AGENT
op_agent_t OProfileAgent::handle_ = NULL;
#endif


bool OProfileAgent::Initialize() {
#ifdef ENABLE_OPROFILE_AGENT
  if (FLAG_oprofile) {
    if (handle_ != NULL) return false;

    // Disable code moving by GC.
    FLAG_always_compact = false;
    FLAG_never_compact = true;

    handle_ = op_open_agent();
    return (handle_ != NULL);
  } else {
    return true;
  }
#else
  if (FLAG_oprofile) {
    OS::Print("Warning: --oprofile specified but binary compiled without "
              "oprofile support.\n");
  }
  return true;
#endif
}


void OProfileAgent::TearDown() {
#ifdef ENABLE_OPROFILE_AGENT
  if (handle_ != NULL) {
    op_close_agent(handle_);
  }
#endif
}


void OProfileAgent::CreateNativeCodeRegion(const char* name,
    const void* ptr, unsigned int size) {
#ifdef ENABLE_OPROFILE_AGENT
  if (handle_ == NULL) return;
  op_write_native_code(handle_, name, (uint64_t)ptr, ptr, size);
#endif
}


void OProfileAgent::CreateNativeCodeRegion(String* name,
    const void* ptr, unsigned int size) {
#ifdef ENABLE_OPROFILE_AGENT
  if (handle_ != NULL) {
    const char* func_name;
    SmartPointer<char> str =
        name->ToCString(DISALLOW_NULLS, ROBUST_STRING_TRAVERSAL);
    func_name = name->length() > 0 ? *str : "<anonymous>";
    CreateNativeCodeRegion(func_name, ptr, size);
  }
#endif
}


void OProfileAgent::CreateNativeCodeRegion(String* name, String* source,
    int line_num, const void* ptr, unsigned int size) {
#ifdef ENABLE_OPROFILE_AGENT
  if (handle_ != NULL) {
    Vector<char> buf = Vector<char>::New(OProfileAgent::kFormattingBufSize);
    const char* func_name;
    SmartPointer<char> str =
        name->ToCString(DISALLOW_NULLS, ROBUST_STRING_TRAVERSAL);
    func_name = name->length() > 0 ? *str : "<anonymous>";
    SmartPointer<char> source_str =
        source->ToCString(DISALLOW_NULLS, ROBUST_STRING_TRAVERSAL);
    if (v8::internal::OS::SNPrintF(buf, "%s %s:%d",
                                   func_name, *source_str, line_num) != -1) {
      CreateNativeCodeRegion(buf.start(), ptr, size);
    } else {
      CreateNativeCodeRegion("<script/func name too long>", ptr, size);
    }
  }
#endif
}
} }