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208 lines (173 loc) · 4.62 KB
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#include "ProgramEngine.h"
//
// C methods
//
// return != 0 if the JS code needs to be interrupted
static int jsInterruptHandler(JSRuntime *rt, void *opaque)
{
return static_cast<ProgramEngine *>(opaque)->handleInterrupt(rt);
}
// return the module specifier (allocated with js_malloc()) or NULL if exception
static char *jsModuleNormaliser(JSContext *ctx, const char *baseName, const char *moduleName, void *opaque)
{
return static_cast<ProgramEngine *>(opaque)->normaliseModuleName(ctx, baseName, moduleName);
}
static JSModuleDef *jsModuleLoader(JSContext *ctx, const char *moduleName, void *opaque)
{
return static_cast<ProgramEngine *>(opaque)->loadModule(ctx, moduleName);
}
//
// C++ code
//
String ProgramEngine::readFile(String filename)
{
auto file = fs->open(filename, FILE_READ);
if (!file)
{
Debug::log(String() + "Failed to open file: " + filename);
return "";
}
auto data = file.readString();
file.close();
return data;
}
void ProgramEngine::writeFile(String filename, String contents)
{
auto file = fs->open(filename, FILE_WRITE);
file.write((const uint8_t *)contents.c_str(), contents.length());
file.close();
}
JSContext *ProgramEngine::createContext()
{
Debug::log("ProgramEngine#createContext");
auto ctx = JS_NewContext(rt);
Debug::log("- setup memory");
JS_SetMemoryLimit(rt, memoryLimit);
JS_SetGCThreshold(rt, memoryLimit >> 3);
if (setupCallback != nullptr)
{
auto global = JS_GetGlobalObject(ctx);
setupCallback(rt, ctx, global);
JS_FreeValue(ctx, global);
}
return ctx;
}
void ProgramEngine::begin()
{
Debug::log("ProgramEngine#begin");
Debug::log("- create runtime");
rt = JS_NewRuntime();
JS_SetInterruptHandler(rt, jsInterruptHandler, this);
JS_SetModuleLoaderFunc(rt, nullptr, jsModuleLoader, this);
}
void ProgramEngine::loop()
{
// Debug::log("ProgramEngine#loop");
if (program != nullptr)
{
// Debug::log("- loop program");
program->loop();
if (program->isInactive())
{
this->stopProgram();
}
}
}
void ProgramEngine::end()
{
Debug::log("ProgramEngine#end");
if (program != nullptr)
{
Debug::log("- end program");
program->end();
delete program;
program = nullptr;
}
JS_FreeRuntime(rt);
}
String ProgramEngine::readScript(String filename)
{
return readFile(dir + filename);
}
void ProgramEngine::writeScript(String filename, String source)
{
return writeFile(dir + filename, source);
}
bool ProgramEngine::scriptExists(String filename)
{
return fs->exists(dir + filename);
}
Program *ProgramEngine::runScript(String filename)
{
Debug::log("ProgramEngine#runScript filename=" + filename);
auto path = dir + filename;
auto data = readFile(path);
if (data == "")
{
return nullptr;
}
return runProgram(data, path);
}
Program *ProgramEngine::runProgram(String code, String filename)
{
this->stopProgram();
Debug::log("ProgramEngine#run filename=" + filename);
auto context = createContext();
program = new Program(rt, context, code, filename);
program->setOpaque(opaque);
program->begin();
return program;
}
void ProgramEngine::stopProgram()
{
Debug::log("ProgramEngine#stopProgram");
if (program == nullptr)
{
return;
}
program->end();
delete program;
program = nullptr;
}
int ProgramEngine::handleInterrupt(JSRuntime *rt)
{
// Shouldn't be running anyway...
if (getProgram() == nullptr)
{
Debug::log("interrupted JavaScript (no program)");
return 1;
}
if (millis() - getProgram()->getExecutionStart() > JS_INTERUPT_THRESHOLD_MS)
{
Debug::log("interrupted JavaScript");
Debug::log(" now=" + String(millis()));
Debug::log(" start=" + String(getProgram()->getExecutionStart()));
Debug::log(" threshold=" + String(JS_INTERUPT_THRESHOLD_MS));
return 1;
}
// else
// {
// Debug::log("no interrupt");
// Debug::log(" now=" + String(millis()));
// Debug::log(" start=" + String(engine->getProgram()->getExecutionStart()));
// Debug::log(" threshold=" + String(JS_INTERUPT_THRESHOLD_MS));
// }
return 0;
}
// If needed in the future
char *ProgramEngine::normaliseModuleName(JSContext *ctx, String baseName, String moduleName)
{
Debug::log("jsModuleNormaliser base=" + baseName + " module=" + moduleName);
return nullptr;
}
JSModuleDef *ProgramEngine::loadModule(JSContext *ctx, String moduleName)
{
Debug::log("loadModule module=" + moduleName);
auto program = static_cast<Program *>(JS_GetContextOpaque(ctx));
if (!moduleName.startsWith(dir))
{
Debug::log("Attempted to read unauthorized module: " + moduleName);
return nullptr;
}
return program->addImport(moduleName, readFile(moduleName));
}