JSCLegacyTracing.cpp
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// Copyright 2004-present Facebook. All Rights Reserved.
#include "JSCLegacyTracing.h"
#if defined(WITH_JSC_EXTRA_TRACING)
#include <fbsystrace.h>
#include <JavaScriptCore/API/JSProfilerPrivate.h>
#include <jschelpers/JSCHelpers.h>
#include <jschelpers/Value.h>
static const char *ENABLED_FBSYSTRACE_PROFILE_NAME = "__fbsystrace__";
using namespace facebook::react;
static int64_t int64FromJSValue(JSContextRef ctx, JSValueRef value, JSValueRef* exception) {
return static_cast<int64_t>(JSC_JSValueToNumber(ctx, value, exception));
}
static JSValueRef nativeTraceBeginLegacy(
JSContextRef ctx,
JSObjectRef function,
JSObjectRef thisObject,
size_t argumentCount,
const JSValueRef arguments[],
JSValueRef* exception) {
if (FBSYSTRACE_LIKELY(argumentCount >= 1)) {
uint64_t tag = int64FromJSValue(ctx, arguments[0], exception);
if (!fbsystrace_is_tracing(tag)) {
return Value::makeUndefined(ctx);
}
}
JSStartProfiling(ctx, String(ctx, ENABLED_FBSYSTRACE_PROFILE_NAME), true);
return Value::makeUndefined(ctx);
}
static JSValueRef nativeTraceEndLegacy(
JSContextRef ctx,
JSObjectRef function,
JSObjectRef thisObject,
size_t argumentCount,
const JSValueRef arguments[],
JSValueRef* exception) {
if (FBSYSTRACE_LIKELY(argumentCount >= 1)) {
uint64_t tag = int64FromJSValue(ctx, arguments[0], exception);
if (!fbsystrace_is_tracing(tag)) {
return Value::makeUndefined(ctx);
}
}
JSEndProfiling(ctx, String(ctx, ENABLED_FBSYSTRACE_PROFILE_NAME));
return Value::makeUndefined(ctx);
}
#endif
namespace facebook {
namespace react {
void addNativeTracingLegacyHooks(JSGlobalContextRef ctx) {
#if defined(WITH_JSC_EXTRA_TRACING)
installGlobalFunction(ctx, "nativeTraceBeginLegacy", nativeTraceBeginLegacy);
installGlobalFunction(ctx, "nativeTraceEndLegacy", nativeTraceEndLegacy);
#endif
}
} }