483 lines
14 KiB
C++
483 lines
14 KiB
C++
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// Copyright 2004-present Facebook. All Rights Reserved.
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#ifdef WITH_JSC_EXTRA_TRACING
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#include <algorithm>
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#include <JavaScriptCore/JavaScript.h>
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#include <JavaScriptCore/API/JSProfilerPrivate.h>
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#include <fbsystrace.h>
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#include <sys/types.h>
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#include <unistd.h>
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#include "JSCHelpers.h"
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using std::min;
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static const char *ENABLED_FBSYSTRACE_PROFILE_NAME = "__fbsystrace__";
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static uint64_t tagFromJSValue(
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JSContextRef ctx,
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JSValueRef value,
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JSValueRef* exception) {
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// XXX validate that this is a lossless conversion.
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// XXX should we just have separate functions for bridge, infra, and apps,
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// then drop this argument to save time?
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(void)exception;
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uint64_t tag = (uint64_t) JSValueToNumber(ctx, value, NULL);
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return tag;
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}
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static int64_t int64FromJSValue(
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JSContextRef ctx,
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JSValueRef value,
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JSValueRef* exception) {
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(void)exception;
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int64_t num = (int64_t) JSValueToNumber(ctx, value, NULL);
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return num;
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}
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static size_t copyTruncatedAsciiChars(
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char* buf,
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size_t bufLen,
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JSContextRef ctx,
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JSValueRef value,
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size_t maxLen) {
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JSStringRef jsString = JSValueToStringCopy(ctx, value, NULL);
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size_t stringLen = JSStringGetLength(jsString);
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// Unlike the Java version, we truncate from the end of the string,
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// rather than the beginning.
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size_t toWrite = min(stringLen, min(bufLen, maxLen));
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const char *startBuf = buf;
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const JSChar* chars = JSStringGetCharactersPtr(jsString);
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while (toWrite-- > 0) {
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*(buf++) = (char)*(chars++);
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}
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JSStringRelease(jsString);
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// Return the number of bytes written
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return buf - startBuf;
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}
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static size_t copyArgsToBuffer(
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char* buf,
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size_t bufLen,
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size_t pos,
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JSContextRef ctx,
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size_t argumentCount,
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const JSValueRef arguments[]) {
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char separator = '|';
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for (
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size_t idx = 0;
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idx + 1 < argumentCount; // Make sure key and value are present.
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idx += 2) {
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JSValueRef key = arguments[idx];
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JSValueRef value = arguments[idx+1];
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buf[pos++] = separator;
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separator = ';';
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if (FBSYSTRACE_UNLIKELY(pos >= bufLen)) { break; }
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pos += copyTruncatedAsciiChars(
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buf + pos, bufLen - pos, ctx, key, FBSYSTRACE_MAX_MESSAGE_LENGTH);
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if (FBSYSTRACE_UNLIKELY(pos >= bufLen)) { break; }
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buf[pos++] = '=';
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if (FBSYSTRACE_UNLIKELY(pos >= bufLen)) { break; }
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pos += copyTruncatedAsciiChars(
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buf + pos, bufLen - pos, ctx, value, FBSYSTRACE_MAX_MESSAGE_LENGTH);
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if (FBSYSTRACE_UNLIKELY(pos >= bufLen)) { break; }
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}
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return pos;
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}
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static JSValueRef nativeTraceBeginSection(
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JSContextRef ctx,
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JSObjectRef function,
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JSObjectRef thisObject,
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size_t argumentCount,
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const JSValueRef arguments[],
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JSValueRef* exception) {
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if (FBSYSTRACE_UNLIKELY(argumentCount < 2)) {
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if (exception) {
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*exception = facebook::react::makeJSCException(
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ctx,
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"nativeTraceBeginSection: requires at least 2 arguments");
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}
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return JSValueMakeUndefined(ctx);
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}
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uint64_t tag = tagFromJSValue(ctx, arguments[0], exception);
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if (!fbsystrace_is_tracing(tag)) {
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return JSValueMakeUndefined(ctx);
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}
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char buf[FBSYSTRACE_MAX_MESSAGE_LENGTH];
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size_t pos = 0;
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pos += snprintf(buf + pos, sizeof(buf) - pos, "B|%d|", getpid());
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// Skip the overflow check here because the int will be small.
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pos += copyTruncatedAsciiChars(buf + pos, sizeof(buf) - pos, ctx, arguments[1], FBSYSTRACE_MAX_SECTION_NAME_LENGTH);
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// Skip the overflow check here because the section name will be small-ish.
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pos = copyArgsToBuffer(buf, sizeof(buf), pos, ctx, argumentCount - 2, arguments + 2);
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if (FBSYSTRACE_UNLIKELY(pos >= sizeof(buf))) {
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goto flush;
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}
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flush:
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fbsystrace_trace_raw(buf, min(pos, sizeof(buf)-1));
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return JSValueMakeUndefined(ctx);
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}
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static JSValueRef nativeTraceEndSection(
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JSContextRef ctx,
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JSObjectRef function,
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JSObjectRef thisObject,
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size_t argumentCount,
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const JSValueRef arguments[],
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JSValueRef* exception) {
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if (FBSYSTRACE_UNLIKELY(argumentCount < 1)) {
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if (exception) {
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*exception = facebook::react::makeJSCException(
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ctx,
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"nativeTraceEndSection: requires at least 1 argument");
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}
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return JSValueMakeUndefined(ctx);
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}
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uint64_t tag = tagFromJSValue(ctx, arguments[0], exception);
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if (!fbsystrace_is_tracing(tag)) {
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return JSValueMakeUndefined(ctx);
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}
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if (FBSYSTRACE_LIKELY(argumentCount == 1)) {
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fbsystrace_end_section(tag);
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} else {
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char buf[FBSYSTRACE_MAX_MESSAGE_LENGTH];
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size_t pos = 0;
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buf[pos++] = 'E';
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buf[pos++] = '|';
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buf[pos++] = '|';
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pos = copyArgsToBuffer(buf, sizeof(buf), pos, ctx, argumentCount - 1, arguments + 1);
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if (FBSYSTRACE_UNLIKELY(pos >= sizeof(buf))) {
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goto flush;
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}
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flush:
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fbsystrace_trace_raw(buf, min(pos, sizeof(buf)-1));
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}
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return JSValueMakeUndefined(ctx);
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}
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static JSValueRef beginOrEndAsync(
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bool isEnd,
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bool isFlow,
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JSContextRef ctx,
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JSObjectRef function,
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JSObjectRef thisObject,
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size_t argumentCount,
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const JSValueRef arguments[],
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JSValueRef* exception) {
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if (FBSYSTRACE_UNLIKELY(argumentCount < 3)) {
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if (exception) {
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*exception = facebook::react::makeJSCException(
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ctx,
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"beginOrEndAsync: requires at least 3 arguments");
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}
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return JSValueMakeUndefined(ctx);
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}
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uint64_t tag = tagFromJSValue(ctx, arguments[0], exception);
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if (!fbsystrace_is_tracing(tag)) {
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return JSValueMakeUndefined(ctx);
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}
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char buf[FBSYSTRACE_MAX_MESSAGE_LENGTH];
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size_t pos = 0;
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// This uses an if-then-else instruction in ARMv7, which should be cheaper
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// than a full branch.
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buf[pos++] = ((isFlow) ? (isEnd ? 'f' : 's') : (isEnd ? 'F' : 'S'));
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pos += snprintf(buf + pos, sizeof(buf) - pos, "|%d|", getpid());
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// Skip the overflow check here because the int will be small.
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pos += copyTruncatedAsciiChars(buf + pos, sizeof(buf) - pos, ctx, arguments[1], FBSYSTRACE_MAX_SECTION_NAME_LENGTH);
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// Skip the overflow check here because the section name will be small-ish.
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// I tried some trickery to avoid a branch here, but gcc did not cooperate.
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// We could consider changing the implementation to be lest branchy in the
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// future.
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// This is not required for flow use an or to avoid introducing another branch
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if (!(isEnd | isFlow)) {
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buf[pos++] = '<';
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buf[pos++] = '0';
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buf[pos++] = '>';
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}
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buf[pos++] = '|';
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// Append the cookie. It should be an integer, but copyTruncatedAsciiChars
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// will automatically convert it to a string. We might be able to get more
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// performance by just getting the number and doing to string
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// conversion ourselves. We truncate to FBSYSTRACE_MAX_SECTION_NAME_LENGTH
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// just to make sure we can avoid the overflow check even if the caller
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// passes in something bad.
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pos += copyTruncatedAsciiChars(buf + pos, sizeof(buf) - pos, ctx, arguments[2], FBSYSTRACE_MAX_SECTION_NAME_LENGTH);
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pos = copyArgsToBuffer(buf, sizeof(buf), pos, ctx, argumentCount - 3, arguments + 3);
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if (FBSYSTRACE_UNLIKELY(pos >= sizeof(buf))) {
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goto flush;
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}
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flush:
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fbsystrace_trace_raw(buf, min(pos, sizeof(buf)-1));
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return JSValueMakeUndefined(ctx);
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}
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static JSValueRef stageAsync(
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bool isFlow,
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JSContextRef ctx,
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JSObjectRef function,
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JSObjectRef thisObject,
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size_t argumentCount,
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const JSValueRef arguments[],
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JSValueRef* exception) {
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if (FBSYSTRACE_UNLIKELY(argumentCount < 4)) {
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if (exception) {
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*exception = facebook::react::makeJSCException(
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ctx,
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"stageAsync: requires at least 4 arguments");
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}
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return JSValueMakeUndefined(ctx);
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}
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uint64_t tag = tagFromJSValue(ctx, arguments[0], exception);
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if (!fbsystrace_is_tracing(tag)) {
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return JSValueMakeUndefined(ctx);
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}
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char buf[FBSYSTRACE_MAX_MESSAGE_LENGTH];
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size_t pos = 0;
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buf[pos++] = (isFlow ? 't' : 'T');
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pos += snprintf(buf + pos, sizeof(buf) - pos, "|%d", getpid());
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// Skip the overflow check here because the int will be small.
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// Arguments are section name, cookie, and stage name.
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// All added together, they still cannot cause an overflow.
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for (int i = 1; i < 4; i++) {
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buf[pos++] = '|';
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pos += copyTruncatedAsciiChars(buf + pos, sizeof(buf) - pos, ctx, arguments[i], FBSYSTRACE_MAX_SECTION_NAME_LENGTH);
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}
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fbsystrace_trace_raw(buf, min(pos, sizeof(buf)-1));
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return JSValueMakeUndefined(ctx);
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}
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static JSValueRef nativeTraceBeginAsyncSection(
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JSContextRef ctx,
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JSObjectRef function,
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JSObjectRef thisObject,
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size_t argumentCount,
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const JSValueRef arguments[],
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JSValueRef* exception) {
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return beginOrEndAsync(
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false /* isEnd */,
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false /* isFlow */,
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ctx,
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function,
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thisObject,
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argumentCount,
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arguments,
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exception);
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}
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static JSValueRef nativeTraceEndAsyncSection(
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JSContextRef ctx,
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JSObjectRef function,
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JSObjectRef thisObject,
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size_t argumentCount,
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const JSValueRef arguments[],
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JSValueRef* exception) {
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return beginOrEndAsync(
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true /* isEnd */,
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false /* isFlow */,
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ctx,
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function,
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thisObject,
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argumentCount,
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arguments,
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exception);
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}
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static JSValueRef nativeTraceAsyncSectionStage(
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JSContextRef ctx,
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JSObjectRef function,
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JSObjectRef thisObject,
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size_t argumentCount,
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const JSValueRef arguments[],
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JSValueRef* exception) {
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return stageAsync(
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false /* isFlow */,
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ctx,
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function,
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thisObject,
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argumentCount,
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arguments,
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exception);
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}
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static JSValueRef nativeTraceBeginAsyncFlow(
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JSContextRef ctx,
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JSObjectRef function,
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JSObjectRef thisObject,
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size_t argumentCount,
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const JSValueRef arguments[],
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JSValueRef* exception) {
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return beginOrEndAsync(
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false /* isEnd */,
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true /* isFlow */,
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ctx,
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function,
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thisObject,
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argumentCount,
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arguments,
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exception);
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}
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static JSValueRef nativeTraceEndAsyncFlow(
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JSContextRef ctx,
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JSObjectRef function,
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JSObjectRef thisObject,
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size_t argumentCount,
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const JSValueRef arguments[],
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JSValueRef* exception) {
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return beginOrEndAsync(
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true /* isEnd */,
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true /* isFlow */,
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ctx,
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function,
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thisObject,
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argumentCount,
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arguments,
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exception);
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}
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static JSValueRef nativeTraceAsyncFlowStage(
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JSContextRef ctx,
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JSObjectRef function,
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JSObjectRef thisObject,
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size_t argumentCount,
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const JSValueRef arguments[],
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JSValueRef* exception) {
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return stageAsync(
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true /* isFlow */,
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ctx,
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|
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function,
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thisObject,
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argumentCount,
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arguments,
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exception);
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}
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static JSValueRef nativeTraceCounter(
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JSContextRef ctx,
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JSObjectRef function,
|
||
|
|
JSObjectRef thisObject,
|
||
|
|
size_t argumentCount,
|
||
|
|
const JSValueRef arguments[],
|
||
|
|
JSValueRef* exception) {
|
||
|
|
if (FBSYSTRACE_UNLIKELY(argumentCount < 3)) {
|
||
|
|
if (exception) {
|
||
|
|
*exception = facebook::react::makeJSCException(
|
||
|
|
ctx,
|
||
|
|
"nativeTraceCounter: requires at least 3 arguments");
|
||
|
|
}
|
||
|
|
return JSValueMakeUndefined(ctx);
|
||
|
|
}
|
||
|
|
|
||
|
|
uint64_t tag = tagFromJSValue(ctx, arguments[0], exception);
|
||
|
|
if (!fbsystrace_is_tracing(tag)) {
|
||
|
|
return JSValueMakeUndefined(ctx);
|
||
|
|
}
|
||
|
|
|
||
|
|
char buf[FBSYSTRACE_MAX_MESSAGE_LENGTH];
|
||
|
|
size_t len = copyTruncatedAsciiChars(buf, sizeof(buf), ctx,
|
||
|
|
arguments[1], FBSYSTRACE_MAX_SECTION_NAME_LENGTH);
|
||
|
|
buf[min(len,(FBSYSTRACE_MAX_MESSAGE_LENGTH-1))] = 0;
|
||
|
|
int64_t value = int64FromJSValue(ctx, arguments[2], exception);
|
||
|
|
|
||
|
|
fbsystrace_counter(tag, buf, value);
|
||
|
|
|
||
|
|
return JSValueMakeUndefined(ctx);
|
||
|
|
}
|
||
|
|
|
||
|
|
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 = tagFromJSValue(ctx, arguments[0], exception);
|
||
|
|
if (!fbsystrace_is_tracing(tag)) {
|
||
|
|
return JSValueMakeUndefined(ctx);
|
||
|
|
}
|
||
|
|
}
|
||
|
|
|
||
|
|
JSStringRef title = JSStringCreateWithUTF8CString(ENABLED_FBSYSTRACE_PROFILE_NAME);
|
||
|
|
#if WITH_REACT_INTERNAL_SETTINGS
|
||
|
|
JSStartProfiling(ctx, title, true);
|
||
|
|
#else
|
||
|
|
JSStartProfiling(ctx, title);
|
||
|
|
#endif
|
||
|
|
JSStringRelease(title);
|
||
|
|
|
||
|
|
return JSValueMakeUndefined(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 = tagFromJSValue(ctx, arguments[0], exception);
|
||
|
|
if (!fbsystrace_is_tracing(tag)) {
|
||
|
|
return JSValueMakeUndefined(ctx);
|
||
|
|
}
|
||
|
|
}
|
||
|
|
|
||
|
|
JSStringRef title = JSStringCreateWithUTF8CString(ENABLED_FBSYSTRACE_PROFILE_NAME);
|
||
|
|
JSEndProfiling(ctx, title);
|
||
|
|
JSStringRelease(title);
|
||
|
|
|
||
|
|
return JSValueMakeUndefined(ctx);
|
||
|
|
}
|
||
|
|
|
||
|
|
namespace facebook {
|
||
|
|
namespace react {
|
||
|
|
|
||
|
|
void addNativeTracingHooks(JSGlobalContextRef ctx) {
|
||
|
|
installGlobalFunction(ctx, "nativeTraceBeginSection", nativeTraceBeginSection);
|
||
|
|
installGlobalFunction(ctx, "nativeTraceEndSection", nativeTraceEndSection);
|
||
|
|
installGlobalFunction(ctx, "nativeTraceBeginLegacy", nativeTraceBeginLegacy);
|
||
|
|
installGlobalFunction(ctx, "nativeTraceEndLegacy", nativeTraceEndLegacy);
|
||
|
|
installGlobalFunction(ctx, "nativeTraceBeginAsyncSection", nativeTraceBeginAsyncSection);
|
||
|
|
installGlobalFunction(ctx, "nativeTraceEndAsyncSection", nativeTraceEndAsyncSection);
|
||
|
|
installGlobalFunction(ctx, "nativeTraceAsyncSectionStage", nativeTraceAsyncSectionStage);
|
||
|
|
installGlobalFunction(ctx, "nativeTraceBeginAsyncFlow", nativeTraceBeginAsyncFlow);
|
||
|
|
installGlobalFunction(ctx, "nativeTraceEndAsyncFlow", nativeTraceEndAsyncFlow);
|
||
|
|
installGlobalFunction(ctx, "nativeTraceAsyncFlowStage", nativeTraceAsyncFlowStage);
|
||
|
|
installGlobalFunction(ctx, "nativeTraceCounter", nativeTraceCounter);
|
||
|
|
}
|
||
|
|
|
||
|
|
} }
|
||
|
|
|
||
|
|
#endif
|