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Add new FileSourceProvider

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Summary: Add a new interface to JSC that allows loading a file lazily from disk, i.e. using mmap, instead of loading the whole file upfront and copying into the VM.

Reviewed By: michalgr

Differential Revision: D3534042

fbshipit-source-id: 98b193cc7b7e33248073e2556ea94ce3391507c7
This commit is contained in:
Tadeu Zagallo
2016-07-11 06:52:06 -07:00
committed by Facebook Github Bot 9
parent e5650560c0
commit 5d06918d07
11 changed files with 291 additions and 50 deletions
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90
ReactCommon/cxxreact/JSCHelpers.cpp
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@@ -44,47 +44,63 @@ JSValueRef evaluateScript(JSContextRef context, JSStringRef script, JSStringRef
JSValueRef exn, result;
result = JSEvaluateScript(context, script, NULL, source, 0, &exn);
if (result == nullptr) {
Value exception = Value(context, exn);
std::string exceptionText = exception.toString().str();
// The null/empty-ness of source tells us if the JS came from a
// file/resource, or was a constructed statement. The location
// info will include that source, if any.
std::string locationInfo = source != nullptr ? String::ref(source).str() : "";
Object exObject = exception.asObject();
auto line = exObject.getProperty("line");
if (line != nullptr && line.isNumber()) {
if (locationInfo.empty() && line.asInteger() != 1) {
// If there is a non-trivial line number, but there was no
// location info, we include a placeholder, and the line
// number.
locationInfo = folly::to<std::string>("<unknown file>:", line.asInteger());
} else if (!locationInfo.empty()) {
// If there is location info, we always include the line
// number, regardless of its value.
locationInfo += folly::to<std::string>(":", line.asInteger());
}
}
if (!locationInfo.empty()) {
exceptionText += " (" + locationInfo + ")";
}
LOG(ERROR) << "Got JS Exception: " << exceptionText;
Value jsStack = exObject.getProperty("stack");
if (jsStack.isNull() || !jsStack.isString()) {
throwJSExecutionException("%s", exceptionText.c_str());
} else {
LOG(ERROR) << "Got JS Stack: " << jsStack.toString().str();
throwJSExecutionExceptionWithStack(
exceptionText.c_str(), jsStack.toString().str().c_str());
}
formatAndThrowJSException(context, exn, source);
}
return result;
}
#if WITH_FBJSCEXTENSIONS
JSValueRef evaluateSourceCode(JSContextRef context, JSSourceCodeRef source, JSStringRef sourceURL) {
JSValueRef exn, result;
result = JSEvaluateSourceCode(context, source, NULL, &exn);
if (result == nullptr) {
formatAndThrowJSException(context, exn, sourceURL);
}
return result;
}
#endif
void formatAndThrowJSException(JSContextRef context, JSValueRef exn, JSStringRef source) {
Value exception = Value(context, exn);
std::string exceptionText = exception.toString().str();
// The null/empty-ness of source tells us if the JS came from a
// file/resource, or was a constructed statement. The location
// info will include that source, if any.
std::string locationInfo = source != nullptr ? String::ref(source).str() : "";
Object exObject = exception.asObject();
auto line = exObject.getProperty("line");
if (line != nullptr && line.isNumber()) {
if (locationInfo.empty() && line.asInteger() != 1) {
// If there is a non-trivial line number, but there was no
// location info, we include a placeholder, and the line
// number.
locationInfo = folly::to<std::string>("<unknown file>:", line.asInteger());
} else if (!locationInfo.empty()) {
// If there is location info, we always include the line
// number, regardless of its value.
locationInfo += folly::to<std::string>(":", line.asInteger());
}
}
if (!locationInfo.empty()) {
exceptionText += " (" + locationInfo + ")";
}
LOG(ERROR) << "Got JS Exception: " << exceptionText;
Value jsStack = exObject.getProperty("stack");
if (jsStack.isNull() || !jsStack.isString()) {
throwJSExecutionException("%s", exceptionText.c_str());
} else {
LOG(ERROR) << "Got JS Stack: " << jsStack.toString().str();
throwJSExecutionExceptionWithStack(
exceptionText.c_str(), jsStack.toString().str().c_str());
}
}
JSValueRef makeJSError(JSContextRef ctx, const char *error) {
JSValueRef nestedException = nullptr;
JSValueRef args[] = { Value(ctx, String(error)) };