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RCTCxxUtils.mm
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RCTCxxUtils.mm
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/**
* Copyright (c) 2015-present, Facebook, Inc.
* All rights reserved.
*
* This source code is licensed under the BSD-style license found in the
* LICENSE file in the root directory of this source tree. An additional grant
* of patent rights can be found in the PATENTS file in the same directory.
*/
#import "RCTCxxUtils.h"
#import <React/RCTFollyConvert.h>
#import <React/RCTUtils.h>
#include <jschelpers/Value.h>
using namespace facebook::react;
@implementation RCTConvert (folly)
+ (folly::dynamic)folly_dynamic:(id)json;
{
if (json == nil || json == (id)kCFNull) {
return nullptr;
} else {
folly::dynamic dyn = convertIdToFollyDynamic(json);
if (dyn == nil) {
RCTAssert(false, @"RCTConvert input json is of an impossible type");
}
return dyn;
}
}
@end
namespace facebook {
namespace react {
JSContext *contextForGlobalContextRef(JSGlobalContextRef contextRef)
{
static std::mutex s_mutex;
static NSMapTable *s_contextCache;
if (!contextRef) {
return nil;
}
// Adding our own lock here, since JSC internal ones are insufficient
std::lock_guard<std::mutex> lock(s_mutex);
if (!s_contextCache) {
NSPointerFunctionsOptions keyOptions = NSPointerFunctionsOpaqueMemory | NSPointerFunctionsOpaquePersonality;
NSPointerFunctionsOptions valueOptions = NSPointerFunctionsWeakMemory | NSPointerFunctionsObjectPersonality;
s_contextCache = [[NSMapTable alloc] initWithKeyOptions:keyOptions valueOptions:valueOptions capacity:0];
}
JSContext *ctx = [s_contextCache objectForKey:(__bridge id)contextRef];
if (!ctx) {
ctx = [JSC_JSContext(contextRef) contextWithJSGlobalContextRef:contextRef];
[s_contextCache setObject:ctx forKey:(__bridge id)contextRef];
}
return ctx;
}
static NSError *errorWithException(const std::exception& e)
{
NSString *msg = @(e.what());
NSMutableDictionary *errorInfo = [NSMutableDictionary dictionary];
const JSException *jsException = dynamic_cast<const JSException*>(&e);
if (jsException) {
errorInfo[RCTJSRawStackTraceKey] = @(jsException->getStack().c_str());
msg = [@"Unhandled JS Exception: " stringByAppendingString:msg];
}
NSError *nestedError;
try {
std::rethrow_if_nested(e);
} catch(const std::exception& e) {
nestedError = errorWithException(e);
} catch(...) {}
if (nestedError) {
msg = [NSString stringWithFormat:@"%@\n\n%@", msg, [nestedError localizedDescription]];
}
errorInfo[NSLocalizedDescriptionKey] = msg;
return [NSError errorWithDomain:RCTErrorDomain code:1 userInfo:errorInfo];
}
NSError *tryAndReturnError(const std::function<void()>& func) {
try {
@try {
func();
return nil;
}
@catch (NSException *exception) {
NSString *message =
[NSString stringWithFormat:@"Exception '%@' was thrown from JS thread", exception];
return RCTErrorWithMessage(message);
}
@catch (id exception) {
// This will catch any other ObjC exception, but no C++ exceptions
return RCTErrorWithMessage(@"non-std ObjC Exception");
}
} catch (const std::exception &ex) {
return errorWithException(ex);
} catch (...) {
// On a 64-bit platform, this would catch ObjC exceptions, too, but not on
// 32-bit platforms, so we catch those with id exceptions above.
return RCTErrorWithMessage(@"non-std C++ exception");
}
}
} }