Sync to trunk (r44371)

[reactos.git] / reactos / tools / widl / header.c

/*
 * IDL Compiler
 *
 * Copyright 2002 Ove Kaaven
 *
 * This library is free software; you can redistribute it and/or
 * modify it under the terms of the GNU Lesser General Public
 * License as published by the Free Software Foundation; either
 * version 2.1 of the License, or (at your option) any later version.
 *
 * This library is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
 * Lesser General Public License for more details.
 *
 * You should have received a copy of the GNU Lesser General Public
 * License along with this library; if not, write to the Free Software
 * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301, USA
 */

#include "config.h"

#include <stdarg.h>
#include <stdio.h>
#include <stdlib.h>
#ifdef HAVE_UNISTD_H
# include <unistd.h>
#endif
#include <string.h>
#include <ctype.h>

#include "widl.h"
#include "utils.h"
#include "parser.h"
#include "header.h"
#include "expr.h"
#include "typetree.h"

typedef struct _user_type_t generic_handle_t;

static int indentation = 0;
user_type_list_t user_type_list = LIST_INIT(user_type_list);
static context_handle_list_t context_handle_list = LIST_INIT(context_handle_list);
static struct list generic_handle_list = LIST_INIT(generic_handle_list);

static void indent(FILE *h, int delta)
{
  int c;
  if (delta < 0) indentation += delta;
  for (c=0; c<indentation; c++) fprintf(h, "    ");
  if (delta > 0) indentation += delta;
}

int is_ptrchain_attr(const var_t *var, enum attr_type t)
{
    if (is_attr(var->attrs, t))
        return 1;
    else
    {
        type_t *type = var->type;
        for (;;)
        {
            if (is_attr(type->attrs, t))
                return 1;
            else if (type_is_alias(type))
                type = type_alias_get_aliasee(type);
            else if (is_ptr(type))
                type = type_pointer_get_ref(type);
            else return 0;
        }
    }
}

int is_aliaschain_attr(const type_t *type, enum attr_type attr)
{
    const type_t *t = type;
    for (;;)
    {
        if (is_attr(t->attrs, attr))
            return 1;
        else if (type_is_alias(t))
            t = type_alias_get_aliasee(t);
        else return 0;
    }
}

int is_attr(const attr_list_t *list, enum attr_type t)
{
    const attr_t *attr;
    if (list) LIST_FOR_EACH_ENTRY( attr, list, const attr_t, entry )
        if (attr->type == t) return 1;
    return 0;
}

void *get_attrp(const attr_list_t *list, enum attr_type t)
{
    const attr_t *attr;
    if (list) LIST_FOR_EACH_ENTRY( attr, list, const attr_t, entry )
        if (attr->type == t) return attr->u.pval;
    return NULL;
}

unsigned long get_attrv(const attr_list_t *list, enum attr_type t)
{
    const attr_t *attr;
    if (list) LIST_FOR_EACH_ENTRY( attr, list, const attr_t, entry )
        if (attr->type == t) return attr->u.ival;
    return 0;
}

int is_void(const type_t *t)
{
    return type_get_type(t) == TYPE_VOID;
}

int is_conformant_array(const type_t *t)
{
    return is_array(t) && type_array_has_conformance(t);
}

void write_guid(FILE *f, const char *guid_prefix, const char *name, const UUID *uuid)
{
  if (!uuid) return;
  fprintf(f, "DEFINE_GUID(%s_%s, 0x%08x, 0x%04x, 0x%04x, 0x%02x,0x%02x, 0x%02x,"
        "0x%02x,0x%02x,0x%02x,0x%02x,0x%02x);\n",
        guid_prefix, name, uuid->Data1, uuid->Data2, uuid->Data3, uuid->Data4[0],
        uuid->Data4[1], uuid->Data4[2], uuid->Data4[3], uuid->Data4[4], uuid->Data4[5],
        uuid->Data4[6], uuid->Data4[7]);
}

const char *get_name(const var_t *v)
{
    static char buffer[256];

    if (is_attr( v->attrs, ATTR_PROPGET ))
        strcpy( buffer, "get_" );
    else if (is_attr( v->attrs, ATTR_PROPPUT ))
        strcpy( buffer, "put_" );
    else if (is_attr( v->attrs, ATTR_PROPPUTREF ))
        strcpy( buffer, "putref_" );
    else
        buffer[0] = 0;
    strcat( buffer, v->name );
    return buffer;
}

static void write_field(FILE *h, var_t *v)
{
  if (!v) return;
  if (v->type) {
    indent(h, 0);
    write_type_def_or_decl(h, v->type, TRUE, v->name);
    fprintf(h, ";\n");
  }
}

static void write_fields(FILE *h, var_list_t *fields)
{
    var_t *v;
    if (!fields) return;
    LIST_FOR_EACH_ENTRY( v, fields, var_t, entry ) write_field(h, v);
}

static void write_enums(FILE *h, var_list_t *enums)
{
  var_t *v;
  if (!enums) return;
  LIST_FOR_EACH_ENTRY( v, enums, var_t, entry )
  {
    if (v->name) {
      indent(h, 0);
      fprintf(h, "%s", get_name(v));
      if (v->eval) {
        fprintf(h, " = ");
        write_expr(h, v->eval, 0, 1, NULL, NULL, "");
      }
    }
    if (list_next( enums, &v->entry )) fprintf(h, ",\n");
  }
  fprintf(h, "\n");
}

int needs_space_after(type_t *t)
{
  return (type_is_alias(t) ||
          (!is_ptr(t) && (!is_array(t) || !type_array_is_decl_as_ptr(t) || t->name)));
}

void write_type_left(FILE *h, type_t *t, int declonly)
{
  if (!h) return;

  if (is_attr(t->attrs, ATTR_CONST) &&
      (type_is_alias(t) || !is_ptr(t)))
    fprintf(h, "const ");

  if (type_is_alias(t)) fprintf(h, "%s", t->name);
  else {
    switch (type_get_type_detect_alias(t)) {
      case TYPE_ENUM:
        if (!declonly && t->defined && !t->written) {
          if (t->name) fprintf(h, "enum %s {\n", t->name);
          else fprintf(h, "enum {\n");
          t->written = TRUE;
          indentation++;
          write_enums(h, type_enum_get_values(t));
          indent(h, -1);
          fprintf(h, "}");
        }
        else fprintf(h, "enum %s", t->name ? t->name : "");
        break;
      case TYPE_STRUCT:
      case TYPE_ENCAPSULATED_UNION:
        if (!declonly && t->defined && !t->written) {
          if (t->name) fprintf(h, "struct %s {\n", t->name);
          else fprintf(h, "struct {\n");
          t->written = TRUE;
          indentation++;
          if (type_get_type(t) != TYPE_STRUCT)
            write_fields(h, type_encapsulated_union_get_fields(t));
          else
            write_fields(h, type_struct_get_fields(t));
          indent(h, -1);
          fprintf(h, "}");
        }
        else fprintf(h, "struct %s", t->name ? t->name : "");
        break;
      case TYPE_UNION:
        if (!declonly && t->defined && !t->written) {
          if (t->name) fprintf(h, "union %s {\n", t->name);
          else fprintf(h, "union {\n");
          t->written = TRUE;
          indentation++;
          write_fields(h, type_union_get_cases(t));
          indent(h, -1);
          fprintf(h, "}");
        }
        else fprintf(h, "union %s", t->name ? t->name : "");
        break;
      case TYPE_POINTER:
        write_type_left(h, type_pointer_get_ref(t), declonly);
        fprintf(h, "%s*", needs_space_after(type_pointer_get_ref(t)) ? " " : "");
        if (is_attr(t->attrs, ATTR_CONST)) fprintf(h, "const ");
        break;
      case TYPE_ARRAY:
        if (t->name && type_array_is_decl_as_ptr(t))
          fprintf(h, "%s", t->name);
        else
        {
          write_type_left(h, type_array_get_element(t), declonly);
          if (type_array_is_decl_as_ptr(t))
            fprintf(h, "%s*", needs_space_after(type_array_get_element(t)) ? " " : "");
        }
        break;
      case TYPE_BASIC:
        if (type_basic_get_type(t) != TYPE_BASIC_INT32 &&
            type_basic_get_type(t) != TYPE_BASIC_HYPER)
        {
          if (type_basic_get_sign(t) < 0) fprintf(h, "signed ");
          else if (type_basic_get_sign(t) > 0) fprintf(h, "unsigned ");
        }
        switch (type_basic_get_type(t))
        {
        case TYPE_BASIC_INT8: fprintf(h, "small"); break;
        case TYPE_BASIC_INT16: fprintf(h, "short"); break;
        case TYPE_BASIC_INT: fprintf(h, "int"); break;
        case TYPE_BASIC_INT64: fprintf(h, "__int64"); break;
        case TYPE_BASIC_INT3264: fprintf(h, "__int3264"); break;
        case TYPE_BASIC_BYTE: fprintf(h, "byte"); break;
        case TYPE_BASIC_CHAR: fprintf(h, "char"); break;
        case TYPE_BASIC_WCHAR: fprintf(h, "wchar_t"); break;
        case TYPE_BASIC_FLOAT: fprintf(h, "float"); break;
        case TYPE_BASIC_DOUBLE: fprintf(h, "double"); break;
        case TYPE_BASIC_ERROR_STATUS_T: fprintf(h, "error_status_t"); break;
        case TYPE_BASIC_HANDLE: fprintf(h, "handle_t"); break;
        case TYPE_BASIC_INT32:
          if (type_basic_get_sign(t) > 0)
            fprintf(h, "ULONG");
          else
            fprintf(h, "LONG");
          break;
        case TYPE_BASIC_HYPER:
          if (type_basic_get_sign(t) > 0)
            fprintf(h, "MIDL_uhyper");
          else
            fprintf(h, "hyper");
          break;
        }
        break;
      case TYPE_INTERFACE:
      case TYPE_MODULE:
      case TYPE_COCLASS:
        fprintf(h, "%s", t->name);
        break;
      case TYPE_VOID:
        fprintf(h, "void");
        break;
      case TYPE_BITFIELD:
        write_type_left(h, type_bitfield_get_field(t), declonly);
        break;
      case TYPE_ALIAS:
      case TYPE_FUNCTION:
        /* handled elsewhere */
        assert(0);
        break;
    }
  }
}

void write_type_right(FILE *h, type_t *t, int is_field)
{
  if (!h) return;

  switch (type_get_type(t))
  {
  case TYPE_ARRAY:
    if (!type_array_is_decl_as_ptr(t))
    {
      if (is_conformant_array(t))
      {
      fprintf(h, "[%s]", is_field ? "1" : "");
      t = type_array_get_element(t);
    }
    for ( ;
         type_get_type(t) == TYPE_ARRAY && !type_array_is_decl_as_ptr(t);
         t = type_array_get_element(t))
      fprintf(h, "[%u]", type_array_get_dim(t));
  }
    break;
  case TYPE_BITFIELD:
    fprintf(h, " : %lu", type_bitfield_get_bits(t)->cval);
    break;
  case TYPE_VOID:
  case TYPE_BASIC:
  case TYPE_ENUM:
  case TYPE_STRUCT:
  case TYPE_ENCAPSULATED_UNION:
  case TYPE_UNION:
  case TYPE_ALIAS:
  case TYPE_MODULE:
  case TYPE_COCLASS:
  case TYPE_FUNCTION:
  case TYPE_INTERFACE:
  case TYPE_POINTER:
    break;
}
}

static void write_type_v(FILE *h, type_t *t, int is_field, int declonly, const char *name)
{
  type_t *pt = NULL;
  int ptr_level = 0;

  if (!h) return;

  if (t) {
  for (pt = t; is_ptr(pt); pt = type_pointer_get_ref(pt), ptr_level++)
    ;

  if (type_get_type_detect_alias(pt) == TYPE_FUNCTION) {
    int i;
    const char *callconv = get_attrp(pt->attrs, ATTR_CALLCONV);
    if (!callconv) callconv = "";
    if (is_attr(pt->attrs, ATTR_INLINE)) fprintf(h, "inline ");
    write_type_left(h, type_function_get_rettype(pt), declonly);
    fputc(' ', h);
    if (ptr_level) fputc('(', h);
    fprintf(h, "%s ", callconv);
    for (i = 0; i < ptr_level; i++)
      fputc('*', h);
  } else
    write_type_left(h, t, declonly);
  }

  if (name) fprintf(h, "%s%s", !t || needs_space_after(t) ? " " : "", name );

  if (t) {
  if (type_get_type_detect_alias(pt) == TYPE_FUNCTION) {
    const var_list_t *args = type_function_get_args(pt);

    if (ptr_level) fputc(')', h);
    fputc('(', h);
    if (args)
        write_args(h, args, NULL, 0, FALSE);
    else
        fprintf(h, "void");
    fputc(')', h);
  } else
    write_type_right(h, t, is_field);
}
}

void write_type_def_or_decl(FILE *f, type_t *t, int field, const char *name)
{
  write_type_v(f, t, field, FALSE, name);
}

void write_type_decl(FILE *f, type_t *t, const char *name)
{
  write_type_v(f, t, FALSE, TRUE, name);
}

void write_type_decl_left(FILE *f, type_t *t)
{
  write_type_left(f, t, TRUE);
}

static int user_type_registered(const char *name)
{
  user_type_t *ut;
  LIST_FOR_EACH_ENTRY(ut, &user_type_list, user_type_t, entry)
    if (!strcmp(name, ut->name))
      return 1;
  return 0;
}

static int context_handle_registered(const char *name)
{
  context_handle_t *ch;
  LIST_FOR_EACH_ENTRY(ch, &context_handle_list, context_handle_t, entry)
    if (!strcmp(name, ch->name))
      return 1;
  return 0;
}

static int generic_handle_registered(const char *name)
{
  generic_handle_t *gh;
  LIST_FOR_EACH_ENTRY(gh, &generic_handle_list, generic_handle_t, entry)
    if (!strcmp(name, gh->name))
      return 1;
  return 0;
}

/* check for types which require additional prototypes to be generated in the
 * header */
void check_for_additional_prototype_types(const var_list_t *list)
{
  const var_t *v;

  if (!list) return;
  LIST_FOR_EACH_ENTRY( v, list, const var_t, entry )
  {
    type_t *type = v->type;
    if (!type) continue;
    for (;;) {
      const char *name = type->name;
      if (type->user_types_registered) break;
      type->user_types_registered = 1;
      if (is_attr(type->attrs, ATTR_CONTEXTHANDLE)) {
        if (!context_handle_registered(name))
        {
          context_handle_t *ch = xmalloc(sizeof(*ch));
          ch->name = xstrdup(name);
          list_add_tail(&context_handle_list, &ch->entry);
        }
        /* don't carry on parsing fields within this type */
        break;
      }
      if ((type_get_type(type) != TYPE_BASIC ||
           type_basic_get_type(type) != TYPE_BASIC_HANDLE) &&
          is_attr(type->attrs, ATTR_HANDLE)) {
        if (!generic_handle_registered(name))
        {
          generic_handle_t *gh = xmalloc(sizeof(*gh));
          gh->name = xstrdup(name);
          list_add_tail(&generic_handle_list, &gh->entry);
        }
        /* don't carry on parsing fields within this type */
        break;
      }
      if (is_attr(type->attrs, ATTR_WIREMARSHAL)) {
        if (!user_type_registered(name))
        {
          user_type_t *ut = xmalloc(sizeof *ut);
          ut->name = xstrdup(name);
          list_add_tail(&user_type_list, &ut->entry);
        }
        /* don't carry on parsing fields within this type as we are already
         * using a wire marshaled type */
        break;
      }
      else if (type_is_complete(type))
      {
        var_list_t *vars;
        switch (type_get_type_detect_alias(type))
        {
        case TYPE_ENUM:
          vars = type_enum_get_values(type);
          break;
        case TYPE_STRUCT:
          vars = type_struct_get_fields(type);
          break;
        case TYPE_UNION:
          vars = type_union_get_cases(type);
          break;
        default:
          vars = NULL;
          break;
        }
        check_for_additional_prototype_types(vars);
      }

      if (type_is_alias(type))
        type = type_alias_get_aliasee(type);
      else if (is_ptr(type))
        type = type_pointer_get_ref(type);
      else if (is_array(type))
        type = type_array_get_element(type);
      else
        break;
    }
  }
}

static void write_user_types(FILE *header)
{
  user_type_t *ut;
  LIST_FOR_EACH_ENTRY(ut, &user_type_list, user_type_t, entry)
  {
    const char *name = ut->name;
    fprintf(header, "ULONG           __RPC_USER %s_UserSize     (ULONG *, ULONG, %s *);\n", name, name);
    fprintf(header, "unsigned char * __RPC_USER %s_UserMarshal  (ULONG *, unsigned char *, %s *);\n", name, name);
    fprintf(header, "unsigned char * __RPC_USER %s_UserUnmarshal(ULONG *, unsigned char *, %s *);\n", name, name);
    fprintf(header, "void            __RPC_USER %s_UserFree     (ULONG *, %s *);\n", name, name);
  }
}

static void write_context_handle_rundowns(FILE *header)
{
  context_handle_t *ch;
  LIST_FOR_EACH_ENTRY(ch, &context_handle_list, context_handle_t, entry)
  {
    const char *name = ch->name;
    fprintf(header, "void __RPC_USER %s_rundown(%s);\n", name, name);
  }
}

static void write_generic_handle_routines(FILE *header)
{
  generic_handle_t *gh;
  LIST_FOR_EACH_ENTRY(gh, &generic_handle_list, generic_handle_t, entry)
  {
    const char *name = gh->name;
    fprintf(header, "handle_t __RPC_USER %s_bind(%s);\n", name, name);
    fprintf(header, "void __RPC_USER %s_unbind(%s, handle_t);\n", name, name);
  }
}

static void write_typedef(FILE *header, type_t *type)
{
  fprintf(header, "typedef ");
  write_type_def_or_decl(header, type_alias_get_aliasee(type), FALSE, type->name);
  fprintf(header, ";\n");
}

int is_const_decl(const var_t *var)
{
  const type_t *t;
  /* strangely, MIDL accepts a const attribute on any pointer in the
  * declaration to mean that data isn't being instantiated. this appears
  * to be a bug, but there is no benefit to being incompatible with MIDL,
  * so we'll do the same thing */
  for (t = var->type; ; )
  {
    if (is_attr(t->attrs, ATTR_CONST))
      return TRUE;
    else if (is_ptr(t))
      t = type_pointer_get_ref(t);
    else break;
  }
  return FALSE;
}

static void write_declaration(FILE *header, const var_t *v)
{
  if (is_const_decl(v) && v->eval)
  {
    fprintf(header, "#define %s (", v->name);
    write_expr(header, v->eval, 0, 1, NULL, NULL, "");
    fprintf(header, ")\n\n");
  }
  else
  {
    switch (v->stgclass)
    {
      case STG_NONE:
      case STG_REGISTER: /* ignored */
        break;
      case STG_STATIC:
        fprintf(header, "static ");
        break;
      case STG_EXTERN:
        fprintf(header, "extern ");
        break;
    }
    write_type_def_or_decl(header, v->type, FALSE, v->name);
    fprintf(header, ";\n\n");
  }
}

static void write_library(FILE *header, const typelib_t *typelib)
{
  const UUID *uuid = get_attrp(typelib->attrs, ATTR_UUID);
  fprintf(header, "\n");
  write_guid(header, "LIBID", typelib->name, uuid);
  fprintf(header, "\n");
}


const var_t* get_explicit_handle_var(const var_t *func)
{
    const var_t* var;

    if (!type_get_function_args(func->type))
        return NULL;

    LIST_FOR_EACH_ENTRY( var, type_get_function_args(func->type), const var_t, entry )
    {
        const type_t *type = var->type;
        if (type_get_type(type) == TYPE_BASIC && type_basic_get_type(type) == TYPE_BASIC_HANDLE)
            return var;
    }

    return NULL;
}

const type_t* get_explicit_generic_handle_type(const var_t* var)
{
    const type_t *t;
    for (t = var->type;
         is_ptr(t) || type_is_alias(t);
         t = type_is_alias(t) ? type_alias_get_aliasee(t) : type_pointer_get_ref(t))
        if ((type_get_type_detect_alias(t) != TYPE_BASIC || type_basic_get_type(t) != TYPE_BASIC_HANDLE) &&
            is_attr(t->attrs, ATTR_HANDLE))
            return t;
    return NULL;
}

const var_t* get_explicit_generic_handle_var(const var_t *func)
{
    const var_t* var;

    if (!type_get_function_args(func->type))
        return NULL;

    LIST_FOR_EACH_ENTRY( var, type_get_function_args(func->type), const var_t, entry )
        if (get_explicit_generic_handle_type(var))
            return var;

    return NULL;
}

const var_t* get_context_handle_var(const var_t *func)
{
    const var_t* var;

    if (!type_get_function_args(func->type))
        return NULL;

    LIST_FOR_EACH_ENTRY( var, type_get_function_args(func->type), const var_t, entry )
        if (is_attr(var->attrs, ATTR_IN) && is_context_handle(var->type))
            return var;

    return NULL;
}

int has_out_arg_or_return(const var_t *func)
{
    const var_t *var;

    if (!is_void(type_function_get_rettype(func->type)))
        return 1;

    if (!type_get_function_args(func->type))
        return 0;

    LIST_FOR_EACH_ENTRY( var, type_get_function_args(func->type), const var_t, entry )
        if (is_attr(var->attrs, ATTR_OUT))
            return 1;

    return 0;
}


/********** INTERFACES **********/

int is_object(const attr_list_t *list)
{
    const attr_t *attr;
    if (list) LIST_FOR_EACH_ENTRY( attr, list, const attr_t, entry )
        if (attr->type == ATTR_OBJECT || attr->type == ATTR_ODL) return 1;
    return 0;
}

int is_local(const attr_list_t *a)
{
  return is_attr(a, ATTR_LOCAL);
}

const var_t *is_callas(const attr_list_t *a)
{
  return get_attrp(a, ATTR_CALLAS);
}

static void write_method_macro(FILE *header, const type_t *iface, const char *name)
{
  const statement_t *stmt;
  int first_iface = 1;

  if (type_iface_get_inherit(iface))
    write_method_macro(header, type_iface_get_inherit(iface), name);

  STATEMENTS_FOR_EACH_FUNC(stmt, type_iface_get_stmts(iface))
  {
    const var_t *func = stmt->u.var;

    if (first_iface)
    {
      fprintf(header, "/*** %s methods ***/\n", iface->name);
      first_iface = 0;
    }

    if (!is_callas(func->attrs)) {
      const var_t *arg;

      fprintf(header, "#define %s_%s(This", name, get_name(func));
      if (type_get_function_args(func->type))
          LIST_FOR_EACH_ENTRY( arg, type_get_function_args(func->type), const var_t, entry )
              fprintf(header, ",%s", arg->name);
      fprintf(header, ") ");

      fprintf(header, "(This)->lpVtbl->%s(This", get_name(func));
      if (type_get_function_args(func->type))
          LIST_FOR_EACH_ENTRY( arg, type_get_function_args(func->type), const var_t, entry )
              fprintf(header, ",%s", arg->name);
      fprintf(header, ")\n");
    }
  }
}

void write_args(FILE *h, const var_list_t *args, const char *name, int method, int do_indent)
{
  const var_t *arg;
  int count = 0;

  if (do_indent)
  {
      indentation++;
      indent(h, 0);
  }
  if (method == 1) {
    fprintf(h, "%s* This", name);
    count++;
  }
  if (args) LIST_FOR_EACH_ENTRY( arg, args, const var_t, entry ) {
    if (count) {
        if (do_indent)
        {
            fprintf(h, ",\n");
            indent(h, 0);
        }
        else fprintf(h, ",");
    }
    write_type_decl(h, arg->type, arg->name);
    count++;
  }
  if (do_indent) indentation--;
}

static void write_cpp_method_def(FILE *header, const type_t *iface)
{
  const statement_t *stmt;

  STATEMENTS_FOR_EACH_FUNC(stmt, type_iface_get_stmts(iface))
  {
    const var_t *func = stmt->u.var;
    if (!is_callas(func->attrs)) {
      const char *callconv = get_attrp(func->type->attrs, ATTR_CALLCONV);
      if (!callconv) callconv = "";
      indent(header, 0);
      fprintf(header, "virtual ");
      write_type_decl_left(header, type_function_get_rettype(func->type));
      fprintf(header, " %s %s(\n", callconv, get_name(func));
      write_args(header, type_get_function_args(func->type), iface->name, 2, TRUE);
      fprintf(header, ") = 0;\n");
      fprintf(header, "\n");
    }
  }
}

static void do_write_c_method_def(FILE *header, const type_t *iface, const char *name)
{
  const statement_t *stmt;
  int first_iface = 1;

  if (type_iface_get_inherit(iface))
    do_write_c_method_def(header, type_iface_get_inherit(iface), name);

  STATEMENTS_FOR_EACH_FUNC(stmt, type_iface_get_stmts(iface))
  {
    const var_t *func = stmt->u.var;
    if (first_iface) {
      indent(header, 0);
      fprintf(header, "/*** %s methods ***/\n", iface->name);
      first_iface = 0;
    }
    if (!is_callas(func->attrs)) {
      const char *callconv = get_attrp(func->type->attrs, ATTR_CALLCONV);
      if (!callconv) callconv = "";
      indent(header, 0);
      write_type_decl_left(header, type_function_get_rettype(func->type));
      fprintf(header, " (%s *%s)(\n", callconv, get_name(func));
      write_args(header, type_get_function_args(func->type), name, 1, TRUE);
      fprintf(header, ");\n");
      fprintf(header, "\n");
    }
  }
}

static void write_c_method_def(FILE *header, const type_t *iface)
{
  do_write_c_method_def(header, iface, iface->name);
}

static void write_c_disp_method_def(FILE *header, const type_t *iface)
{
  do_write_c_method_def(header, type_iface_get_inherit(iface), iface->name);
}

static void write_method_proto(FILE *header, const type_t *iface)
{
  const statement_t *stmt;

  STATEMENTS_FOR_EACH_FUNC(stmt, type_iface_get_stmts(iface))
  {
    const var_t *func = stmt->u.var;

    if (!is_local(func->attrs)) {
      const char *callconv = get_attrp(func->type->attrs, ATTR_CALLCONV);
      if (!callconv) callconv = "";
      /* proxy prototype */
      write_type_decl_left(header, type_function_get_rettype(func->type));
      fprintf(header, " %s %s_%s_Proxy(\n", callconv, iface->name, get_name(func));
      write_args(header, type_get_function_args(func->type), iface->name, 1, TRUE);
      fprintf(header, ");\n");
      /* stub prototype */
      fprintf(header, "void __RPC_STUB %s_%s_Stub(\n", iface->name, get_name(func));
      fprintf(header, "    IRpcStubBuffer* This,\n");
      fprintf(header, "    IRpcChannelBuffer* pRpcChannelBuffer,\n");
      fprintf(header, "    PRPC_MESSAGE pRpcMessage,\n");
      fprintf(header, "    DWORD* pdwStubPhase);\n");
    }
  }
}

static void write_locals(FILE *fp, const type_t *iface, int body)
{
  static const char comment[]
    = "/* WIDL-generated stub.  You must provide an implementation for this.  */";
  const statement_t *stmt;

  if (!is_object(iface->attrs))
    return;

  STATEMENTS_FOR_EACH_FUNC(stmt, type_iface_get_stmts(iface)) {
    const var_t *func = stmt->u.var;
    const var_t *cas = is_callas(func->attrs);

    if (cas) {
      const statement_t *stmt2 = NULL;
      STATEMENTS_FOR_EACH_FUNC(stmt2, type_iface_get_stmts(iface))
        if (!strcmp(stmt2->u.var->name, cas->name))
          break;
      if (&stmt2->entry != type_iface_get_stmts(iface)) {
        const var_t *m = stmt2->u.var;
        /* proxy prototype - use local prototype */
        write_type_decl_left(fp, type_function_get_rettype(m->type));
        fprintf(fp, " CALLBACK %s_%s_Proxy(\n", iface->name, get_name(m));
        write_args(fp, type_get_function_args(m->type), iface->name, 1, TRUE);
        fprintf(fp, ")");
        if (body) {
          type_t *rt = type_function_get_rettype(m->type);
          fprintf(fp, "\n{\n");
          fprintf(fp, "    %s\n", comment);
          if (rt->name && strcmp(rt->name, "HRESULT") == 0)
            fprintf(fp, "    return E_NOTIMPL;\n");
          else if (type_get_type(rt) != TYPE_VOID) {
            fprintf(fp, "    ");
            write_type_decl(fp, rt, "rv");
            fprintf(fp, ";\n");
            fprintf(fp, "    memset(&rv, 0, sizeof rv);\n");
            fprintf(fp, "    return rv;\n");
          }
          fprintf(fp, "}\n\n");
        }
        else
          fprintf(fp, ";\n");
        /* stub prototype - use remotable prototype */
        write_type_decl_left(fp, type_function_get_rettype(func->type));
        fprintf(fp, " __RPC_STUB %s_%s_Stub(\n", iface->name, get_name(m));
        write_args(fp, type_get_function_args(func->type), iface->name, 1, TRUE);
        fprintf(fp, ")");
        if (body)
          /* Remotable methods must all return HRESULTs.  */
          fprintf(fp, "\n{\n    %s\n    return E_NOTIMPL;\n}\n\n", comment);
        else
          fprintf(fp, ";\n");
      }
      else
        error_loc("invalid call_as attribute (%s -> %s)\n", func->name, cas->name);
    }
  }
}

static void write_local_stubs_stmts(FILE *local_stubs, const statement_list_t *stmts)
{
  const statement_t *stmt;
  if (stmts) LIST_FOR_EACH_ENTRY( stmt, stmts, const statement_t, entry )
  {
    if (stmt->type == STMT_TYPE && type_get_type(stmt->u.type) == TYPE_INTERFACE)
      write_locals(local_stubs, stmt->u.type, TRUE);
    else if (stmt->type == STMT_LIBRARY)
      write_local_stubs_stmts(local_stubs, stmt->u.lib->stmts);
  }
}

void write_local_stubs(const statement_list_t *stmts)
{
  FILE *local_stubs;

  if (!local_stubs_name) return;

  local_stubs = fopen(local_stubs_name, "w");
  if (!local_stubs) {
    error("Could not open %s for output\n", local_stubs_name);
    return;
  }
  fprintf(local_stubs, "/* call_as/local stubs for %s */\n\n", input_name);
  fprintf(local_stubs, "#include <objbase.h>\n");
  fprintf(local_stubs, "#include \"%s\"\n\n", header_name);

  write_local_stubs_stmts(local_stubs, stmts);

  fclose(local_stubs);
}

static void write_function_proto(FILE *header, const type_t *iface, const var_t *fun, const char *prefix)
{
  const char *callconv = get_attrp(fun->type->attrs, ATTR_CALLCONV);

  /* FIXME: do we need to handle call_as? */
  write_type_decl_left(header, type_function_get_rettype(fun->type));
  fprintf(header, " ");
  if (callconv) fprintf(header, "%s ", callconv);
  fprintf(header, "%s%s(\n", prefix, get_name(fun));
  if (type_get_function_args(fun->type))
    write_args(header, type_get_function_args(fun->type), iface->name, 0, TRUE);
  else
    fprintf(header, "    void");
  fprintf(header, ");\n\n");
}

static void write_forward(FILE *header, type_t *iface)
{
  fprintf(header, "#ifndef __%s_FWD_DEFINED__\n", iface->name);
  fprintf(header, "#define __%s_FWD_DEFINED__\n", iface->name);
  fprintf(header, "typedef interface %s %s;\n", iface->name, iface->name);
  fprintf(header, "#endif\n\n" );
}

static void write_iface_guid(FILE *header, const type_t *iface)
{
  const UUID *uuid = get_attrp(iface->attrs, ATTR_UUID);
  write_guid(header, "IID", iface->name, uuid);
} 

static void write_dispiface_guid(FILE *header, const type_t *iface)
{
  const UUID *uuid = get_attrp(iface->attrs, ATTR_UUID);
  write_guid(header, "DIID", iface->name, uuid);
}

static void write_coclass_guid(FILE *header, const type_t *cocl)
{
  const UUID *uuid = get_attrp(cocl->attrs, ATTR_UUID);
  write_guid(header, "CLSID", cocl->name, uuid);
}

static void write_com_interface_start(FILE *header, const type_t *iface)
{
  int dispinterface = is_attr(iface->attrs, ATTR_DISPINTERFACE);
  fprintf(header, "/*****************************************************************************\n");
  fprintf(header, " * %s %sinterface\n", iface->name, dispinterface ? "disp" : "");
  fprintf(header, " */\n");
  fprintf(header,"#ifndef __%s_%sINTERFACE_DEFINED__\n", iface->name, dispinterface ? "DISP" : "");
  fprintf(header,"#define __%s_%sINTERFACE_DEFINED__\n\n", iface->name, dispinterface ? "DISP" : "");
}

static void write_com_interface_end(FILE *header, type_t *iface)
{
  int dispinterface = is_attr(iface->attrs, ATTR_DISPINTERFACE);
  if (dispinterface)
    write_dispiface_guid(header, iface);
  else
    write_iface_guid(header, iface);
  /* C++ interface */
  fprintf(header, "#if defined(__cplusplus) && !defined(CINTERFACE)\n");
  if (type_iface_get_inherit(iface))
  {
    fprintf(header, "interface %s : public %s\n", iface->name,
            type_iface_get_inherit(iface)->name);
    fprintf(header, "{\n");
  }
  else
  {
    fprintf(header, "interface %s\n", iface->name);
    fprintf(header, "{\n");
    fprintf(header, "    BEGIN_INTERFACE\n");
    fprintf(header, "\n");
  }
  /* dispinterfaces don't have real functions, so don't write C++ functions for
   * them */
  if (!dispinterface)
  {
    indentation++;
    write_cpp_method_def(header, iface);
    indentation--;
  }
  if (!type_iface_get_inherit(iface))
    fprintf(header, "    END_INTERFACE\n");
  fprintf(header, "};\n");
  fprintf(header, "#else\n");
  /* C interface */
  fprintf(header, "typedef struct %sVtbl {\n", iface->name);
  indentation++;
  fprintf(header, "    BEGIN_INTERFACE\n");
  fprintf(header, "\n");
  if (dispinterface)
    write_c_disp_method_def(header, iface);
  else
    write_c_method_def(header, iface);
  indentation--;
  fprintf(header, "    END_INTERFACE\n");
  fprintf(header, "} %sVtbl;\n", iface->name);
  fprintf(header, "interface %s {\n", iface->name);
  fprintf(header, "    CONST_VTBL %sVtbl* lpVtbl;\n", iface->name);
  fprintf(header, "};\n");
  fprintf(header, "\n");
  fprintf(header, "#ifdef COBJMACROS\n");
  /* dispinterfaces don't have real functions, so don't write macros for them,
   * only for the interface this interface inherits from, i.e. IDispatch */
  write_method_macro(header, dispinterface ? type_iface_get_inherit(iface) : iface, iface->name);
  fprintf(header, "#endif\n");
  fprintf(header, "\n");
  fprintf(header, "#endif\n");
  fprintf(header, "\n");
  /* dispinterfaces don't have real functions, so don't write prototypes for
   * them */
  if (!dispinterface)
  {
    write_method_proto(header, iface);
    write_locals(header, iface, FALSE);
    fprintf(header, "\n");
  }
  fprintf(header,"#endif  /* __%s_%sINTERFACE_DEFINED__ */\n\n", iface->name, dispinterface ? "DISP" : "");
}

static void write_rpc_interface_start(FILE *header, const type_t *iface)
{
  unsigned int ver = get_attrv(iface->attrs, ATTR_VERSION);
  const char *var = get_attrp(iface->attrs, ATTR_IMPLICIT_HANDLE);
  static int allocate_written = 0;

  if (!allocate_written)
  {
    allocate_written = 1;
    fprintf(header, "void * __RPC_USER MIDL_user_allocate(SIZE_T);\n");
    fprintf(header, "void __RPC_USER MIDL_user_free(void *);\n\n");
  }

  fprintf(header, "/*****************************************************************************\n");
  fprintf(header, " * %s interface (v%d.%d)\n", iface->name, MAJORVERSION(ver), MINORVERSION(ver));
  fprintf(header, " */\n");
  fprintf(header,"#ifndef __%s_INTERFACE_DEFINED__\n", iface->name);
  fprintf(header,"#define __%s_INTERFACE_DEFINED__\n\n", iface->name);
  if (var) fprintf(header, "extern handle_t %s;\n", var);
  if (old_names)
  {
      fprintf(header, "extern RPC_IF_HANDLE %s%s_ClientIfHandle;\n", prefix_client, iface->name);
      fprintf(header, "extern RPC_IF_HANDLE %s%s_ServerIfHandle;\n", prefix_server, iface->name);
  }
  else
  {
      fprintf(header, "extern RPC_IF_HANDLE %s%s_v%d_%d_c_ifspec;\n",
              prefix_client, iface->name, MAJORVERSION(ver), MINORVERSION(ver));
      fprintf(header, "extern RPC_IF_HANDLE %s%s_v%d_%d_s_ifspec;\n",
              prefix_server, iface->name, MAJORVERSION(ver), MINORVERSION(ver));
  }
}

static void write_rpc_interface_end(FILE *header, const type_t *iface)
{
  fprintf(header,"\n#endif  /* __%s_INTERFACE_DEFINED__ */\n\n", iface->name);
}

static void write_coclass(FILE *header, type_t *cocl)
{
  fprintf(header, "/*****************************************************************************\n");
  fprintf(header, " * %s coclass\n", cocl->name);
  fprintf(header, " */\n\n");
  write_coclass_guid(header, cocl);
  fprintf(header, "\n");
}

static void write_coclass_forward(FILE *header, type_t *cocl)
{
  fprintf(header, "#ifndef __%s_FWD_DEFINED__\n", cocl->name);
  fprintf(header, "#define __%s_FWD_DEFINED__\n", cocl->name);
  fprintf(header, "typedef struct %s %s;\n", cocl->name, cocl->name);
  fprintf(header, "#endif /* defined __%s_FWD_DEFINED__ */\n\n", cocl->name );
}

static void write_import(FILE *header, const char *fname)
{
  char *hname, *p;

  hname = dup_basename(fname, ".idl");
  p = hname + strlen(hname) - 2;
  if (p <= hname || strcmp( p, ".h" )) strcat(hname, ".h");

  fprintf(header, "#include <%s>\n", hname);
  free(hname);
}

static void write_imports(FILE *header, const statement_list_t *stmts)
{
  const statement_t *stmt;
  if (stmts) LIST_FOR_EACH_ENTRY( stmt, stmts, const statement_t, entry )
  {
    switch (stmt->type)
    {
      case STMT_TYPE:
        if (type_get_type(stmt->u.type) == TYPE_INTERFACE)
          write_imports(header, type_iface_get_stmts(stmt->u.type));
        break;
      case STMT_TYPEREF:
      case STMT_IMPORTLIB:
        /* not included in header */
        break;
      case STMT_IMPORT:
        write_import(header, stmt->u.str);
        break;
      case STMT_TYPEDEF:
      case STMT_MODULE:
      case STMT_CPPQUOTE:
      case STMT_DECLARATION:
        /* not processed here */
        break;
      case STMT_LIBRARY:
        write_imports(header, stmt->u.lib->stmts);
        break;
    }
  }
}

static void write_forward_decls(FILE *header, const statement_list_t *stmts)
{
  const statement_t *stmt;
  if (stmts) LIST_FOR_EACH_ENTRY( stmt, stmts, const statement_t, entry )
  {
    switch (stmt->type)
    {
      case STMT_TYPE:
        if (type_get_type(stmt->u.type) == TYPE_INTERFACE)
        {
          if (is_object(stmt->u.type->attrs) || is_attr(stmt->u.type->attrs, ATTR_DISPINTERFACE))
            write_forward(header, stmt->u.type);
        }
        else if (type_get_type(stmt->u.type) == TYPE_COCLASS)
          write_coclass_forward(header, stmt->u.type);
        break;
      case STMT_TYPEREF:
      case STMT_IMPORTLIB:
        /* not included in header */
        break;
      case STMT_IMPORT:
      case STMT_TYPEDEF:
      case STMT_MODULE:
      case STMT_CPPQUOTE:
      case STMT_DECLARATION:
        /* not processed here */
        break;
      case STMT_LIBRARY:
        write_forward_decls(header, stmt->u.lib->stmts);
        break;
    }
  }
}

static void write_header_stmts(FILE *header, const statement_list_t *stmts, const type_t *iface, int ignore_funcs)
{
  const statement_t *stmt;
  if (stmts) LIST_FOR_EACH_ENTRY( stmt, stmts, const statement_t, entry )
  {
    switch (stmt->type)
    {
      case STMT_TYPE:
        if (type_get_type(stmt->u.type) == TYPE_INTERFACE)
        {
          type_t *iface = stmt->u.type;
          if (is_attr(stmt->u.type->attrs, ATTR_DISPINTERFACE) || is_object(stmt->u.type->attrs))
          {
            write_com_interface_start(header, iface);
            write_header_stmts(header, type_iface_get_stmts(iface), stmt->u.type, TRUE);
            write_com_interface_end(header, iface);
          }
          else
          {
            write_rpc_interface_start(header, iface);
            write_header_stmts(header, type_iface_get_stmts(iface), iface, FALSE);
            write_rpc_interface_end(header, iface);
          }
        }
        else if (type_get_type(stmt->u.type) == TYPE_COCLASS)
          write_coclass(header, stmt->u.type);
        else
        {
          write_type_def_or_decl(header, stmt->u.type, FALSE, NULL);
          fprintf(header, ";\n\n");
        }
        break;
      case STMT_TYPEREF:
        /* FIXME: shouldn't write out forward declarations for undefined
        * interfaces but a number of our IDL files depend on this */
        if (type_get_type(stmt->u.type) == TYPE_INTERFACE && !stmt->u.type->written)
          write_forward(header, stmt->u.type);
        break;
      case STMT_IMPORTLIB:
      case STMT_MODULE:
        /* not included in header */
        break;
      case STMT_IMPORT:
        /* not processed here */
        break;
      case STMT_TYPEDEF:
      {
        const type_list_t *type_entry = stmt->u.type_list;
        for (; type_entry; type_entry = type_entry->next)
          write_typedef(header, type_entry->type);
        break;
      }
      case STMT_LIBRARY:
        write_library(header, stmt->u.lib);
        write_header_stmts(header, stmt->u.lib->stmts, NULL, FALSE);
        break;
      case STMT_CPPQUOTE:
        fprintf(header, "%s\n", stmt->u.str);
        break;
      case STMT_DECLARATION:
        if (iface && type_get_type(stmt->u.var->type) == TYPE_FUNCTION)
        {
          if (!ignore_funcs)
          {
            int prefixes_differ = strcmp(prefix_client, prefix_server);

            if (prefixes_differ)
            {
              fprintf(header, "/* client prototype */\n");
              write_function_proto(header, iface, stmt->u.var, prefix_client);
              fprintf(header, "/* server prototype */\n");
            }
            write_function_proto(header, iface, stmt->u.var, prefix_server);
          }
        }
        else
          write_declaration(header, stmt->u.var);
        break;
    }
  }
}

void write_header(const statement_list_t *stmts)
{
  FILE *header;

  if (!do_header) return;

  if(!(header = fopen(header_name, "w"))) {
    error("Could not open %s for output\n", header_name);
    return;
  }
  fprintf(header, "/*** Autogenerated by WIDL %s from %s - Do not edit ***/\n\n", PACKAGE_VERSION, input_name);
  fprintf(header, "#include <rpc.h>\n" );
  fprintf(header, "#include <rpcndr.h>\n\n" );

  fprintf(header, "#ifndef __WIDL_%s\n", header_token);
  fprintf(header, "#define __WIDL_%s\n\n", header_token);
  start_cplusplus_guard(header);

  fprintf(header, "/* Headers for imported files */\n\n");
  write_imports(header, stmts);
  fprintf(header, "\n");

  /* FIXME: should be before imported file includes */
  fprintf(header, "/* Forward declarations */\n\n");
  write_forward_decls(header, stmts);
  fprintf(header, "\n");

  write_header_stmts(header, stmts, NULL, FALSE);

  fprintf(header, "/* Begin additional prototypes for all interfaces */\n");
  fprintf(header, "\n");
  write_user_types(header);
  write_generic_handle_routines(header);
  write_context_handle_rundowns(header);
  fprintf(header, "\n");
  fprintf(header, "/* End additional prototypes */\n");
  fprintf(header, "\n");

  end_cplusplus_guard(header);
  fprintf(header, "#endif /* __WIDL_%s */\n", header_token);

  fclose(header);
}