cputracemark-extension.cc

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// Copyright 2019 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/extensions/cputracemark-extension.h"
 
#include "include/v8-isolate.h"
#include "include/v8-template.h"
#include "src/api/api.h"
 
namespace v8 {
namespace internal {
 
v8::Local<v8::FunctionTemplate>
CpuTraceMarkExtension::GetNativeFunctionTemplate(v8::Isolate* isolate,
                                                 v8::Local<v8::String> str) {
  return v8::FunctionTemplate::New(isolate, CpuTraceMarkExtension::Mark);
}
 
void CpuTraceMarkExtension::Mark(
    const v8::FunctionCallbackInfo<v8::Value>& info) {
  DCHECK(ValidateCallbackInfo(info));
  if (info.Length() < 1 || !info[0]->IsUint32()) {
    info.GetIsolate()->ThrowError(
        "First parameter to cputracemark() must be a unsigned int32.");
    return;
  }
 
#if V8_HOST_ARCH_IA32 || V8_HOST_ARCH_X64
 
#if defined(__clang__)
  // for non msvc build
  uint32_t param =
      info[0]->Uint32Value(info.GetIsolate()->GetCurrentContext()).ToChecked();
 
  int magic_dummy;
 
#if defined(__i386__) && defined(__pic__)
  __asm__ __volatile__("push %%ebx; cpuid; pop %%ebx"
                       : "=a"(magic_dummy)
                       : "a"(0x4711 | (param << 16))
                       : "ecx", "edx");
#else
  __asm__ __volatile__("cpuid"
                       : "=a"(magic_dummy)
                       : "a"(0x4711 | (param << 16))
                       : "ecx", "edx", "ebx");
#endif  // defined(__i386__) && defined(__pic__)
 
#else
  // no msvc build support yet.
#endif  
 
#endif  // V8_HOST_ARCH_IA32 || V8_HOST_ARCH_X64
}
 
}  // namespace internal
}  // namespace v8