tools/miniswig/create_wrapper.cpp

   1 #include "tree.h"
   2 #include <iostream>
   3 #include <sstream>
   4 #include <stdexcept>
   5 #include "create_wrapper.h"
   6 #include "globals.h"
   7
   8 void
   9 WrapperCreator::create_wrapper(Namespace* ns)
  10 {
  11     // hpp file
  12     hppout
  13         << "/**\n"
  14         << " * WARNING: This file is automatically generated from '"
  15         << inputfile << "' - do not change\n"
  16         << " */\n"
  17         << "#ifndef __" << modulename << "_WRAPPER_H__\n"
  18         << "#define __" << modulename << "_WRAPPER_H__\n"
  19         << "\n"
  20         << "#include \"wrapper_util.h\"\n"
  21         << "\n"
  22         << "extern WrappedFunction " << modulename << "_global_functions[];\n"
  23         << "extern WrappedClass " << modulename << "_classes[];\n"
  24         << "\n"
  25         << "#endif\n"
  26         << "\n";
  27
  28     // cpp header
  29     out << "/**\n"
  30         << " * WARNING: This file is automatically generated from '"
  31         << inputfile << "' - do not change\n"
  32         << " */\n"
  33         << "\n"
  34         << "#include <config.h>\n"
  35         << "#include <new>\n"
  36         << "#include <assert.h>\n"
  37         << "#include <string>\n"
  38         << "#include <squirrel.h>\n"
  39         << "#include \"wrapper_util.h\"\n"
  40         << "#include \"wrapper.interface.h\"\n"
  41         << "\n";
  42     if(selected_namespace != "") {
  43         out << "using namespace " << selected_namespace << ";\n";
  44         out << "\n";
  45     }
  46
  47     for(std::vector<AtomicType*>::iterator i = ns->types.begin();
  48             i != ns->types.end(); ++i) {
  49         AtomicType* type = *i;
  50         Class* _class = dynamic_cast<Class*> (type);
  51         if(_class != 0)
  52             create_class_wrapper(_class);
  53     }
  54     for(std::vector<Function*>::iterator i = ns->functions.begin();
  55             i != ns->functions.end(); ++i) {
  56         create_function_wrapper(0, *i);
  57     }
  58
  59     // create function list...
  60     out << "WrappedFunction " << modulename << "_global_functions[] = {\n";
  61     for(std::vector<Function*>::iterator i = ns->functions.begin();
  62             i != ns->functions.end(); ++i) {
  63         Function* function = *i;
  64         out << ind << "{ \"" << function->name << "\", &"
  65             << function->name << "_wrapper },\n";
  66     }
  67     out << ind << "{ 0, 0 }\n"
  68         << "};\n"
  69         << "\n";
  70
  71     // create class list...
  72     std::ostringstream classlist;
  73     classlist << "WrappedClass " << modulename << "_classes[] = {\n";
  74
  75     for(std::vector<AtomicType*>::iterator i = ns->types.begin();
  76             i != ns->types.end(); ++i) {
  77         AtomicType* type = *i;
  78         Class* _class = dynamic_cast<Class*> (type);
  79         if(_class == 0)
  80             continue;
  81
  82         classlist << ind << "{ \"" << _class->name << "\", "
  83             << modulename << "_" << _class->name
  84             << "_methods },\n";
  85
  86         out << "static WrappedFunction " << modulename << "_"
  87             << _class->name << "_methods[] = {\n";
  88         for(std::vector<ClassMember*>::iterator i = _class->members.begin();
  89                 i != _class->members.end(); ++i) {
  90             ClassMember* member = *i;
  91             if(member->visibility != ClassMember::PUBLIC)
  92                 continue;
  93             Function* function = dynamic_cast<Function*> (member);
  94             if(!function || function->type == Function::DESTRUCTOR)
  95                 continue;
  96
  97             out << ind << "{ \"" << function->name << "\", &"
  98                 << _class->name << "_" << function->name << "_wrapper },\n";
  99         }
 100         out << "};\n"
 101             << "\n";
 102     }
 103     classlist << ind << "{ 0, 0 }\n";
 104     classlist << "};\n";
 105     out << classlist.str();
 106     out << "\n";
 107 }
 108
 109 void
 110 WrapperCreator::create_function_wrapper(Class* _class, Function* function)
 111 {
 112     if(function->type == Function::DESTRUCTOR)
 113         assert(false);
 114
 115     std::string ns_prefix;
 116     if(selected_namespace != "")
 117         ns_prefix = selected_namespace + "::";
 118     if(function->type == Function::CONSTRUCTOR)
 119         function->name = "constructor";
 120
 121     out << "static int ";
 122     if(_class != 0) {
 123         out << _class->name << "_";
 124     }
 125     out << function->name << "_wrapper(HSQUIRRELVM v)\n"
 126         << "{\n";
 127     // avoid warning...
 128     if(_class == 0 && function->parameters.empty()
 129             && function->return_type.is_void()
 130             && function->type != Function::CONSTRUCTOR) {
 131         out << ind << "(void) v;\n";
 132     }
 133
 134     // eventually retrieve pointer to class instance
 135     if(_class != 0 && function->type != Function::CONSTRUCTOR) {
 136         out << ind << ns_prefix <<  _class->name << "* _this;\n";
 137         out << ind << "sq_getinstanceup(v, 1, (SQUserPointer*) &_this, 0);\n";
 138     }
 139
 140     // declare and retrieve arguments
 141     size_t i = 0;
 142     for(std::vector<Parameter>::iterator p = function->parameters.begin();
 143             p != function->parameters.end(); ++p) {
 144         char argname[64];
 145         snprintf(argname, sizeof(argname), "arg%u", i);
 146         prepare_argument(p->type, i + 2, argname);
 147
 148         ++i;
 149     }
 150
 151     // call function
 152     out << ind << "\n";
 153     out << ind;
 154     if(!function->return_type.is_void()) {
 155         function->return_type.write_c_type(out);
 156         out << " return_value = ";
 157     }
 158     if(_class != 0) {
 159         if(function->type == Function::CONSTRUCTOR) {
 160             out << ns_prefix << _class->name << "* _this = new " << ns_prefix;
 161         } else {
 162             out << "_this->";
 163         }
 164     } else {
 165         out << ns_prefix;
 166     }
 167     if(function->type == Function::CONSTRUCTOR) {
 168         out << _class->name << "(";
 169     } else {
 170         out << function->name << "(";
 171     }
 172     for(size_t i = 0; i < function->parameters.size(); ++i) {
 173         if(i != 0)
 174             out << ", ";
 175         out << "arg" << i;
 176     }
 177     out << ");\n";
 178     if(function->type == Function::CONSTRUCTOR) {
 179         out << ind << "sq_setinstanceup(v, 1, _this);\n";
 180         out << ind << "sq_setreleasehook(v, 1, "
 181             << _class->name << "_release_hook);\n";
 182     }
 183     out << ind << "\n";
 184     // push return value back on stack and return
 185     if(function->return_type.is_void()) {
 186         out << ind << "return 0;\n";
 187     } else {
 188         push_to_stack(function->return_type, "return_value");
 189         out << ind << "return 1;\n";
 190     }
 191     out << "}\n";
 192     out << "\n";
 193 }
 194
 195 void
 196 WrapperCreator::prepare_argument(const Type& type, size_t index,
 197         const std::string& var)
 198 {
 199     if(type.ref > 0 && type.atomic_type != StringType::instance())
 200         throw std::runtime_error("References not handled yet");
 201     if(type.pointer > 0)
 202         throw std::runtime_error("Pointers not handled yet");
 203     if(type.atomic_type == &BasicType::INT) {
 204         out << ind << "int " << var << ";\n";
 205         out << ind << "sq_getinteger(v, " << index << ", &" << var << ");\n";
 206     } else if(type.atomic_type == &BasicType::FLOAT) {
 207         out << ind << "float " << var << ";\n";
 208         out << ind << "sq_getfloat(v, " << index << ", &" << var << ");\n";
 209     } else if(type.atomic_type == &BasicType::BOOL) {
 210         out << ind << "SQBool " << var << ";\n";
 211         out << ind << "sq_getbool(v, " << index << ", &" << var << ");\n";
 212     } else if(type.atomic_type == StringType::instance()) {
 213         out << ind << "const char* " << var << ";\n";
 214         out << ind << "sq_getstring(v, " << index << ", &" << var << ");\n";
 215     } else {
 216         std::ostringstream msg;
 217         msg << "Type '" << type.atomic_type->name << "' not supported yet.";
 218         throw std::runtime_error(msg.str());
 219     }
 220 }
 221
 222 void
 223 WrapperCreator::push_to_stack(const Type& type, const std::string& var)
 224 {
 225     if(type.ref > 0 && type.atomic_type != StringType::instance())
 226         throw std::runtime_error("References not handled yet");
 227     if(type.pointer > 0)
 228         throw std::runtime_error("Pointers not handled yet");
 229     out << ind;
 230     if(type.atomic_type == &BasicType::INT) {
 231         out << "sq_pushinteger(v, " << var << ");\n";
 232     } else if(type.atomic_type == &BasicType::FLOAT) {
 233         out << "sq_pushfloat(v, " << var << ");\n";
 234     } else if(type.atomic_type == &BasicType::BOOL) {
 235         out << "sq_pushbool(v, " << var << ");\n";
 236     } else if(type.atomic_type == StringType::instance()) {
 237         out << "sq_pushstring(v, " << var << ".c_str(), "
 238             << var << ".size());\n";
 239     } else {
 240         std::ostringstream msg;
 241         msg << "Type '" << type.atomic_type->name << "' not supported yet.";
 242         throw std::runtime_error(msg.str());
 243     }
 244 }
 245
 246 void
 247 WrapperCreator::create_class_wrapper(Class* _class)
 248 {
 249     bool release_hook_created = false;
 250     for(std::vector<ClassMember*>::iterator i = _class->members.begin();
 251             i != _class->members.end(); ++i) {
 252         ClassMember* member = *i;
 253         if(member->visibility != ClassMember::PUBLIC)
 254             continue;
 255         Function* function = dynamic_cast<Function*> (member);
 256         if(!function)
 257             continue;
 258         if(function->type == Function::CONSTRUCTOR
 259             && !release_hook_created) {
 260           create_class_release_hook(_class);
 261           release_hook_created = true;
 262         }
 263         // don't wrap destructors
 264         if(function->type == Function::DESTRUCTOR)
 265             continue;
 266         create_function_wrapper(_class, function);
 267     }
 268 }
 269
 270 void
 271 WrapperCreator::create_class_release_hook(Class* _class)
 272 {
 273     out << "static int " << _class->name << "_release_hook(SQUserPointer ptr, int )\n"
 274         << "{\n"
 275         << ind << _class->name
 276         << "* _this = reinterpret_cast<" << _class->name << "*> (ptr);\n"
 277         << ind << "delete _this;\n"
 278         << ind << "return 0;\n"
 279         << "}\n"
 280         << "\n";
 281 }
 282