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Check for module cyclic dependencies. Throw proper V8 exceptions when the require method is not successful.

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This commit is contained in:
Simon Best 2013-03-24 19:08:54 +00:00
parent a20c4b84cc
commit ff443f3bc7
1 changed files with 36 additions and 29 deletions
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65
v8js_methods.cc
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@ -30,6 +30,7 @@ extern "C" {
#include "php_v8js_macros.h"
#include <v8.h>
#include <map>
#include <vector>
/* global.exit - terminate execution */
V8JS_METHOD(exit) /* {{{ */
@ -170,42 +171,49 @@ V8JS_METHOD(var_dump) /* {{{ */
// TODO: Put this in php_v8js_context
std::map<char *, v8::Handle<v8::Object> > modules_loaded;
std::vector<char *> modules_stack;
V8JS_METHOD(require)
{
//v8::Persistent<v8::Value> module_name_value_v8 = v8::Persistent<v8::Value>::New(args[0]->ToObject());
v8::String::Utf8Value module_name_v8(args[0]);
// Make sure to duplicate the string to ensure it is not freed by V8's garbage collector
// Make sure to duplicate the module name string so it doesn't get freed by the V8 garbage collector
char *module_name = strdup(ToCString(module_name_v8));
// Check for module cyclic dependencies
for (std::vector<char *>::iterator it = modules_stack.begin(); it != modules_stack.end(); ++it)
{
if (!strcmp(*it, module_name)) {
return v8::ThrowException(v8::String::New("Module cyclic dependency"));
}
}
// If we have already loaded and cached this module then use it
if (modules_loaded.count(module_name) > 0) {
printf("Using cached module\n");
return modules_loaded[module_name];
}
// Get the extension context
v8::Handle<v8::External> data = v8::Handle<v8::External>::Cast(args.Data());
php_v8js_ctx *c = static_cast<php_v8js_ctx*>(data->Value());
// Check that we have a module loader
if (c->module_loader == NULL) {
return v8::ThrowException(v8::String::New("No module loader"));
}
// Callback to PHP to load the module code
zval module_code;
zval *module_name_zend;
MAKE_STD_ZVAL(module_name_zend);
ZVAL_STRING(module_name_zend, module_name, 1);
zval* params[] = { module_name_zend };
// Get the module loader from extension context
v8::Handle<v8::External> data = v8::Handle<v8::External>::Cast(args.Data());
php_v8js_ctx *c = static_cast<php_v8js_ctx*>(data->Value());
if (c->module_loader == NULL) {
printf("Module loader not defined!\n");
exit(-1);
}
if (SUCCESS == call_user_function(EG(function_table), NULL, c->module_loader, &module_code, 1, params TSRMLS_CC)) {
printf("CODE = %s\n", Z_STRVAL(module_code));
} else {
printf("Module loader callback failed\n");
exit(-1);
if (FAILURE == call_user_function(EG(function_table), NULL, c->module_loader, &module_code, 1, params TSRMLS_CC)) {
return v8::ThrowException(v8::String::New("Module loader callback failed"));
}
// Create a template for the global object and set the built-in global functions
@ -213,7 +221,7 @@ printf("Using cached module\n");
global->Set(v8::String::New("print"), v8::FunctionTemplate::New(V8JS_MN(print)), v8::ReadOnly);
global->Set(v8::String::New("require"), v8::FunctionTemplate::New(V8JS_MN(require), v8::External::New(c)), v8::ReadOnly);
// Add the exports object
// Add the exports object in which the module returns its API
v8::Handle<v8::ObjectTemplate> exports_template = v8::ObjectTemplate::New();
v8::Handle<v8::Object> exports = exports_template->NewInstance();
global->Set(v8::String::New("exports"), exports);
@ -240,32 +248,31 @@ printf("Using cached module\n");
// The script will be empty if there are compile errors
if (script.IsEmpty()) {
//php_v8js_throw_exception(&try_catch TSRMLS_CC);
printf("Compile error\n");
exit(-1);
return V8JS_NULL;
return v8::ThrowException(v8::String::New("Module script compile failed"));
}
// Add this module to the stack
modules_stack.push_back(module_name);
// Run script
//c->in_execution++;
v8::Local<v8::Value> result = script->Run();
//c->in_execution--;
// Remove this module from the stack
modules_stack.pop_back();
// Script possibly terminated, return immediately
if (!try_catch.CanContinue()) {
// TODO: Throw PHP exception here?
return V8JS_NULL;
return v8::ThrowException(v8::String::New("Module script compile failed"));
}
// Handle runtime JS exceptions
if (try_catch.HasCaught()) {
// Rethrow the exception back to JS
try_catch.ReThrow();
return V8JS_NULL;
return try_catch.ReThrow();
}
// Cache the module
// Cache the module so it doesn't need to be compiled and run again
modules_loaded[module_name] = handle_scope.Close(exports);
return modules_loaded[module_name];