]> git.xonotic.org Git - xonotic/gmqcc.git/blobdiff - parser.c
Some allocator changes (still doesn't work)
[xonotic/gmqcc.git] / parser.c
index 067e10910021fca9c389a218d4dc73faace3ccf5..f548e22403f2e5a5a82a0c58b18b16a2fc562ab5 100644 (file)
--- a/parser.c
+++ b/parser.c
@@ -23,6 +23,9 @@ typedef struct {
     ast_value *imm_float_zero;
     ast_value *imm_vector_zero;
 
+    size_t crc_globals;
+    size_t crc_fields;
+
     ast_function *function;
     MEM_VECTOR_MAKE(varentry_t, locals);
     size_t blocklocal;
@@ -59,7 +62,7 @@ static void parseerror(parser_t *parser, const char *fmt, ...)
        parser->errors++;
 
        va_start(ap, fmt);
-    vprintmsg(LVL_ERROR, parser->lex->tok->ctx.file, parser->lex->tok->ctx.line, "parse error", fmt, ap);
+    vprintmsg(LVL_ERROR, parser->lex->tok.ctx.file, parser->lex->tok.ctx.line, "parse error", fmt, ap);
        va_end(ap);
 }
 
@@ -78,7 +81,7 @@ static bool GMQCC_WARN parsewarning(parser_t *parser, int warntype, const char *
        }
 
        va_start(ap, fmt);
-    vprintmsg(lvl, parser->lex->tok->ctx.file, parser->lex->tok->ctx.line, "warning", fmt, ap);
+    vprintmsg(lvl, parser->lex->tok.ctx.file, parser->lex->tok.ctx.line, "warning", fmt, ap);
        va_end(ap);
 
        return opts_werror;
@@ -155,17 +158,9 @@ bool parser_next(parser_t *parser)
     return true;
 }
 
-/* lift a token out of the parser so it's not destroyed by parser_next */
-token *parser_lift(parser_t *parser)
-{
-    token *tok = parser->lex->tok;
-    parser->lex->tok = NULL;
-    return tok;
-}
-
-#define parser_tokval(p) (p->lex->tok->value)
-#define parser_token(p)  (p->lex->tok)
-#define parser_ctx(p)    (p->lex->tok->ctx)
+#define parser_tokval(p) ((p)->lex->tok.value)
+#define parser_token(p)  (&((p)->lex->tok))
+#define parser_ctx(p)    ((p)->lex->tok.ctx)
 
 static ast_value* parser_const_float(parser_t *parser, double d)
 {
@@ -420,6 +415,9 @@ static ast_value *parse_type(parser_t *parser, int basetype, bool *isfunc)
             goto on_error;
     }
 
+    if (params.p_count > 8)
+        parseerror(parser, "more than 8 parameters are currently not supported");
+
     var = ast_value_new(ctx, "<unnamed>", vtype);
     if (!var)
         goto on_error;
@@ -453,6 +451,7 @@ MEM_VEC_FUNCTIONS(shunt, sy_elem, ops)
 static sy_elem syexp(lex_ctx ctx, ast_expression *v) {
     sy_elem e;
     e.etype = 0;
+    e.off   = 0;
     e.out   = v;
     e.block = NULL;
     e.ctx   = ctx;
@@ -463,6 +462,7 @@ static sy_elem syexp(lex_ctx ctx, ast_expression *v) {
 static sy_elem syblock(lex_ctx ctx, ast_block *v) {
     sy_elem e;
     e.etype = 0;
+    e.off   = 0;
     e.out   = (ast_expression*)v;
     e.block = v;
     e.ctx   = ctx;
@@ -473,6 +473,7 @@ static sy_elem syblock(lex_ctx ctx, ast_block *v) {
 static sy_elem syop(lex_ctx ctx, const oper_info *op) {
     sy_elem e;
     e.etype = 1 + (op - operators);
+    e.off   = 0;
     e.out   = NULL;
     e.block = NULL;
     e.ctx   = ctx;
@@ -869,10 +870,50 @@ static bool parser_sy_pop(parser_t *parser, shunt *sy)
             break;
 
         case opid1('='):
-            if (ast_istype(exprs[0], ast_entfield))
+            if (ast_istype(exprs[0], ast_entfield)) {
+                ast_expression *field = ((ast_entfield*)exprs[0])->field;
                 assignop = type_storep_instr[exprs[0]->expression.vtype];
+                if (!ast_compare_type(field->expression.next, exprs[1])) {
+                    char ty1[1024];
+                    char ty2[1024];
+                    ast_type_to_string(field->expression.next, ty1, sizeof(ty1));
+                    ast_type_to_string(exprs[1], ty2, sizeof(ty2));
+                    if (opts_standard == COMPILER_QCC &&
+                        field->expression.next->expression.vtype == TYPE_FUNCTION &&
+                        exprs[1]->expression.vtype == TYPE_FUNCTION)
+                    {
+                        if (parsewarning(parser, WARN_ASSIGN_FUNCTION_TYPES,
+                                         "invalid types in assignment: cannot assign %s to %s", ty2, ty1))
+                        {
+                            parser->errors++;
+                        }
+                    }
+                    else
+                        parseerror(parser, "invalid types in assignment: cannot assign %s to %s", ty2, ty1);
+                }
+            }
             else
+            {
                 assignop = type_store_instr[exprs[0]->expression.vtype];
+                if (!ast_compare_type(exprs[0], exprs[1])) {
+                    char ty1[1024];
+                    char ty2[1024];
+                    ast_type_to_string(exprs[0], ty1, sizeof(ty1));
+                    ast_type_to_string(exprs[1], ty2, sizeof(ty2));
+                    if (opts_standard == COMPILER_QCC &&
+                        exprs[0]->expression.vtype == TYPE_FUNCTION &&
+                        exprs[1]->expression.vtype == TYPE_FUNCTION)
+                    {
+                        if (parsewarning(parser, WARN_ASSIGN_FUNCTION_TYPES,
+                                         "invalid types in assignment: cannot assign %s to %s", ty2, ty1))
+                        {
+                            parser->errors++;
+                        }
+                    }
+                    else
+                        parseerror(parser, "invalid types in assignment: cannot assign %s to %s", ty2, ty1);
+                }
+            }
             out = (ast_expression*)ast_store_new(ctx, assignop, exprs[0], exprs[1]);
             break;
         case opid2('+','='):
@@ -972,6 +1013,8 @@ static bool parser_close_call(parser_t *parser, shunt *sy)
             MEM_VECTOR_MOVE(params, exprs, call, params);
             ast_delete(params);
         }
+        if (!ast_call_check_types(call))
+            parser->errors++;
     } else {
         parseerror(parser, "invalid function call");
         return false;
@@ -1820,7 +1863,7 @@ static bool parse_block_into(parser_t *parser, ast_block *block, bool warnreturn
             break;
 
         if (!parse_statement(parser, block, &expr)) {
-            parseerror(parser, "parse error");
+            /* parseerror(parser, "parse error"); */
             block = NULL;
             goto cleanup;
         }
@@ -1926,8 +1969,8 @@ static bool parse_function_body(parser_t *parser, ast_value *var)
     ast_expression *framenum  = NULL;
     ast_expression *nextthink = NULL;
     /* None of the following have to be deleted */
-    ast_expression *fld_think, *fld_nextthink, *fld_frame;
-    ast_expression *gbl_time, *gbl_self;
+    ast_expression *fld_think = NULL, *fld_nextthink = NULL, *fld_frame = NULL;
+    ast_expression *gbl_time = NULL, *gbl_self = NULL;
     bool            has_frame_think;
 
     bool retval = true;
@@ -2176,7 +2219,7 @@ static bool parse_function_body(parser_t *parser, ast_value *var)
             }
             ve[e].var = NULL; /* collected */
         }
-        if (e != e) {
+        if (e != 3) {
             parser->locals -= e;
             do {
                 mem_d(ve[e].name);
@@ -2202,12 +2245,12 @@ static bool parse_function_body(parser_t *parser, ast_value *var)
     parser->function = func;
     if (!parse_block_into(parser, block, true)) {
         ast_block_delete(block);
-        goto enderrfn;
+        goto enderrfn2;
     }
 
     if (!ast_function_blocks_add(func, block)) {
         ast_block_delete(block);
-        goto enderrfn;
+        goto enderrfn2;
     }
 
     parser->function = old;
@@ -2220,6 +2263,8 @@ static bool parse_function_body(parser_t *parser, ast_value *var)
         parseerror(parser, "missing semicolon after function body (mandatory with -std=qcc)");
     return retval;
 
+enderrfn2:
+    parser->functions_count--;
 enderrfn:
     ast_function_delete(func);
     var->constval.vfunc = NULL;
@@ -2239,6 +2284,7 @@ static bool parse_variable(parser_t *parser, ast_block *localblock)
     lex_ctx         ctx;
 
     ast_value      *var = NULL;
+    ast_value      *fld = NULL;
     bool cleanvar = false;
 
     varentry_t      varent;
@@ -2252,10 +2298,21 @@ static bool parse_variable(parser_t *parser, ast_block *localblock)
     bool isparam;
 
     bool retval = true;
+    bool isfield = false;
 
     /* go */
 
-    int basetype = parser_token(parser)->constval.t;
+    int basetype;
+
+    if (parser->tok == '.') {
+        isfield = true;
+        if (!parser_next(parser)) {
+            parseerror(parser, "expected typename for field definition");
+            return false;
+        }
+    }
+
+    basetype = parser_token(parser)->constval.t;
 
     if (!parser_next(parser)) {
         parseerror(parser, "expected variable definition");
@@ -2292,65 +2349,25 @@ static bool parse_variable(parser_t *parser, ast_block *localblock)
             goto cleanup;
         }
 
-        if (!isfunc) {
-            if (!localblock && (olddecl = parser_find_global(parser, parser_tokval(parser)))) {
-                parseerror(parser, "global `%s` already declared here: %s:%i",
-                           parser_tokval(parser), ast_ctx(olddecl).file, (int)ast_ctx(olddecl).line);
-                retval = false;
-                goto cleanup;
+        if (!localblock) {
+            bool was_end = false;
+            if      (!strcmp(parser_tokval(parser), "end_sys_globals")) {
+                parser->crc_globals = parser->globals_count;
+                was_end = true;
             }
-
-            if (localblock) {
-                olddecl = parser_find_local(parser, parser_tokval(parser), parser->blocklocal, &isparam);
-                if (opts_standard == COMPILER_GMQCC)
-                {
-                    if (olddecl)
-                    {
-                        if (!isparam) {
-                            parseerror(parser, "local `%s` already declared here: %s:%i",
-                                       parser_tokval(parser), ast_ctx(olddecl).file, (int)ast_ctx(olddecl).line);
-                            retval = false;
-                            goto cleanup;
-                        }
-                    }
-
-                    if( (!isparam && olddecl) ||
-                        (olddecl = parser_find_local(parser, parser_tokval(parser), 0, &isparam))
-                      )
-                    {
-                        if (parsewarning(parser, WARN_LOCAL_SHADOWS,
-                                         "local `%s` is shadowing a parameter", parser_tokval(parser)))
-                        {
-                            parseerror(parser, "local `%s` already declared here: %s:%i",
-                                       parser_tokval(parser), ast_ctx(olddecl).file, (int)ast_ctx(olddecl).line);
-                            retval = false;
-                            goto cleanup;
-                        }
-                    }
-                }
-                else
+            else if (!strcmp(parser_tokval(parser), "end_sys_fields")) {
+                parser->crc_fields = parser->fields_count;
+                was_end = true;
+            }
+            if (isfield && was_end) {
+                if (parsewarning(parser, WARN_END_SYS_FIELDS,
+                                 "global '%s' hint should not be a field",
+                                 parser_tokval(parser)))
                 {
-                    if (olddecl)
-                    {
-                        ast_value_delete(var);
-                        var = NULL;
-                        if (isparam &&
-                            parsewarning(parser, WARN_LOCAL_SHADOWS,
-                                         "a parameter is shadowing local `%s`", parser_tokval(parser)))
-                        {
-                            retval = false;
-                            goto cleanup;
-                        }
-                        else if (!isparam)
-                        {
-                            parseerror(parser, "local `%s` already declared here: %s:%i",
-                                       parser_tokval(parser), ast_ctx(olddecl).file, (int)ast_ctx(olddecl).line);
-                            retval = false;
-                            goto cleanup;
-                        }
-                        goto nextvar;
-                    }
+                    retval = false;
+                    goto cleanup;
                 }
+
             }
         }
 
@@ -2428,13 +2445,144 @@ static bool parse_variable(parser_t *parser, ast_block *localblock)
             var = fval;
         }
 
+        if (isfield) {
+            ast_value *tmp;
+            fld = ast_value_new(ctx, var->name, TYPE_FIELD);
+            fld->expression.next = (ast_expression*)var;
+            tmp = var;
+            var = fld;
+            fld = tmp;
+        }
+        else
+            fld = var;
+
+        if (!isfunc) {
+            if (!localblock)
+            {
+                olddecl = parser_find_global(parser, var->name);
+                if (olddecl) {
+                    if (!isfield) {
+                        parseerror(parser, "global `%s` already declared here: %s:%i",
+                                   var->name, ast_ctx(olddecl).file, (int)ast_ctx(olddecl).line);
+                        retval = false;
+                        goto cleanup;
+                    }
+                    else if (opts_standard == COMPILER_QCC) {
+                        parseerror(parser, "cannot declare a field and a global of the same name with -std=qcc");
+                        parseerror(parser, "global `%s` already declared here: %s:%i",
+                                   var->name, ast_ctx(olddecl).file, (int)ast_ctx(olddecl).line);
+                        retval = false;
+                        goto cleanup;
+                    }
+                }
+                olddecl = parser_find_field(parser, var->name);
+                if (olddecl && opts_standard == COMPILER_QCC) {
+                    if (!isfield) {
+                        parseerror(parser, "cannot declare a field and a global of the same name with -std=qcc");
+                        parseerror(parser, "field `%s` already declared here: %s:%i",
+                                   var->name, ast_ctx(olddecl).file, (int)ast_ctx(olddecl).line);
+                        retval = false;
+                        goto cleanup;
+                    }
+                    else
+                    {
+                        if (parsewarning(parser, WARN_FIELD_REDECLARED, "field `%s` already declared here: %s:%i",
+                                         var->name, ast_ctx(olddecl).file, (int)ast_ctx(olddecl).line))
+                        {
+                            retval = false;
+                            goto cleanup;
+                        }
+                        if (!ast_compare_type(olddecl, (ast_expression*)var)) {
+                            parseerror(parser, "field %s has previously been declared with a different type here: %s:%i",
+                                       var->name, ast_ctx(olddecl).file, (int)ast_ctx(olddecl).line);
+                            retval = false;
+                            goto cleanup;
+                        }
+                        ast_delete(var);
+                        var = NULL;
+                        goto nextvar;
+                    }
+                }
+                else if (olddecl) {
+                    parseerror(parser, "field `%s` already declared here: %s:%i",
+                               var->name, ast_ctx(olddecl).file, (int)ast_ctx(olddecl).line);
+                    retval = false;
+                    goto cleanup;
+                }
+            }
+            else /* if it's a local: */
+            {
+                olddecl = parser_find_local(parser, var->name, parser->blocklocal, &isparam);
+                if (opts_standard == COMPILER_GMQCC)
+                {
+                    if (olddecl)
+                    {
+                        if (!isparam) {
+                            parseerror(parser, "local `%s` already declared here: %s:%i",
+                                       var->name, ast_ctx(olddecl).file, (int)ast_ctx(olddecl).line);
+                            retval = false;
+                            goto cleanup;
+                        }
+                    }
+
+                    if( (!isparam && olddecl) ||
+                        (olddecl = parser_find_local(parser, var->name, 0, &isparam))
+                      )
+                    {
+                        if (parsewarning(parser, WARN_LOCAL_SHADOWS,
+                                         "local `%s` is shadowing a parameter", var->name))
+                        {
+                            parseerror(parser, "local `%s` already declared here: %s:%i",
+                                       var->name, ast_ctx(olddecl).file, (int)ast_ctx(olddecl).line);
+                            retval = false;
+                            goto cleanup;
+                        }
+                    }
+                }
+                else
+                {
+                    if (olddecl)
+                    {
+                        if (isparam &&
+                            parsewarning(parser, WARN_LOCAL_SHADOWS,
+                                         "a parameter is shadowing local `%s`", var->name))
+                        {
+                            ast_value_delete(var);
+                            var = NULL;
+                            retval = false;
+                            goto cleanup;
+                        }
+                        else if (!isparam)
+                        {
+                            parseerror(parser, "local `%s` already declared here: %s:%i",
+                                       var->name, ast_ctx(olddecl).file, (int)ast_ctx(olddecl).line);
+                            ast_value_delete(var);
+                            var = NULL;
+                            retval = false;
+                            goto cleanup;
+                        }
+                        ast_value_delete(var);
+                        var = NULL;
+                        goto nextvar;
+                    }
+                }
+            }
+        }
+
+
         if (!hadproto) {
             varent.name = util_strdup(var->name);
             varent.var = (ast_expression*)var;
 
             if (!localblock) {
-                if (!(retval = parser_t_globals_add(parser, varent)))
-                    goto cleanup;
+                if (!isfield) {
+                    if (!(retval = parser_t_globals_add(parser, varent)))
+                        goto cleanup;
+                }
+                else {
+                    if (!(retval = parser_t_fields_add(parser, varent)))
+                        goto cleanup;
+                }
             } else {
                 if (!(retval = parser_t_locals_add(parser, varent)))
                     goto cleanup;
@@ -2444,7 +2592,7 @@ static bool parse_variable(parser_t *parser, ast_block *localblock)
                 }
             }
 
-            if (var->expression.vtype == TYPE_VECTOR)
+            if (fld->expression.vtype == TYPE_VECTOR)
             {
                 size_t e;
                 if (!create_vector_members(parser, var, ve)) {
@@ -2454,8 +2602,14 @@ static bool parse_variable(parser_t *parser, ast_block *localblock)
 
                 if (!localblock) {
                     for (e = 0; e < 3; ++e) {
-                        if (!(retval = parser_t_globals_add(parser, ve[e])))
-                            break;
+                        if (!isfield) {
+                            if (!(retval = parser_t_globals_add(parser, ve[e])))
+                                break;
+                        }
+                        else {
+                            if (!(retval = parser_t_fields_add(parser, ve[e])))
+                                break;
+                        }
                     }
                     if (!retval) {
                         parser->globals_count -= e+1;
@@ -2498,6 +2652,12 @@ nextvar:
             continue;
         }
 
+        if (!localblock && isfield) {
+            parseerror(parser, "missing semicolon");
+            ast_value_delete(typevar);
+            return false;
+        }
+
         /* NOTE: only 'typevar' needs to be deleted from here on, so 'cleanup' won't be used
          * to avoid having too many gotos
          */
@@ -2644,7 +2804,7 @@ cleanup:
 
 static bool parser_global_statement(parser_t *parser)
 {
-    if (parser->tok == TOKEN_TYPENAME)
+    if (parser->tok == TOKEN_TYPENAME || parser->tok == '.')
     {
         return parse_variable(parser, NULL);
     }
@@ -2653,144 +2813,6 @@ static bool parser_global_statement(parser_t *parser)
         /* handle 'var' and 'const' */
         return false;
     }
-    else if (parser->tok == '.')
-    {
-        ast_value *var;
-        ast_value *typevar;
-        ast_value *fld;
-        ast_expression *oldex;
-        bool       isfunc = false;
-        int        basetype;
-        lex_ctx    ctx = parser_ctx(parser);
-        varentry_t varent;
-
-        /* entity-member declaration */
-        if (!parser_next(parser) || parser->tok != TOKEN_TYPENAME) {
-            parseerror(parser, "expected member variable definition");
-            return false;
-        }
-
-        /* remember the base/return type */
-        basetype = parser_token(parser)->constval.t;
-
-        /* parse into the declaration */
-        if (!parser_next(parser)) {
-            parseerror(parser, "expected field definition");
-            return false;
-        }
-
-        /* parse the field type fully */
-        typevar = var = parse_type(parser, basetype, &isfunc);
-        if (!var)
-            return false;
-
-        while (true) {
-            var = ast_value_copy(typevar);
-            /* now the field name */
-            if (parser->tok != TOKEN_IDENT) {
-                parseerror(parser, "expected field name");
-                ast_delete(var);
-                return false;
-            }
-
-            /* check for an existing field
-             * in original qc we also have to check for an existing
-             * global named like the field
-             */
-            if (opts_standard == COMPILER_QCC) {
-                if (parser_find_global(parser, parser_tokval(parser))) {
-                    parseerror(parser, "cannot declare a field and a global of the same name with -std=qcc");
-                    ast_delete(var);
-                    return false;
-                }
-            }
-
-            if (isfunc) {
-                ast_value *fval;
-                fval = ast_value_new(ctx, var->name, TYPE_FUNCTION);
-                if (!fval) {
-                    ast_value_delete(var);
-                    return false;
-                }
-                fval->expression.next = (ast_expression*)var;
-                MEM_VECTOR_MOVE(&var->expression, params, &fval->expression, params);
-                fval->expression.variadic = var->expression.variadic;
-                var = fval;
-            }
-
-            /* turn it into a field */
-            fld = ast_value_new(ctx, parser_tokval(parser), TYPE_FIELD);
-            fld->expression.next = (ast_expression*)var;
-
-            if ( (oldex = parser_find_field(parser, parser_tokval(parser)))) {
-                if (ast_istype(oldex, ast_member)) {
-                    parseerror(parser, "cannot declare a field with the same name as a vector component, component %s has been declared here: %s:%i",
-                               parser_tokval(parser), ast_ctx(oldex).file, (int)ast_ctx(oldex).line);
-                    ast_delete(fld);
-                    return false;
-                }
-                if (!ast_istype(oldex, ast_value)) {
-                    /* not possible / sanity check */
-                    parseerror(parser, "internal error: %s is not an ast_value", parser_tokval(parser));
-                    ast_delete(fld);
-                    return false;
-                }
-
-                if (!ast_compare_type(oldex, (ast_expression*)fld)) {
-                    parseerror(parser, "field %s has previously been declared with a different type here: %s:%i",
-                               parser_tokval(parser), ast_ctx(oldex).file, (int)ast_ctx(oldex).line);
-                    ast_delete(fld);
-                    return false;
-                } else {
-                    if (parsewarning(parser, WARN_FIELD_REDECLARED, "field `%s` has already been declared here: %s:%i",
-                                     parser_tokval(parser), ast_ctx(oldex).file, (int)ast_ctx(oldex).line))
-                    {
-                        ast_delete(fld);
-                        return false;
-                    }
-                }
-
-                ast_delete(fld);
-                goto nextfield;
-            }
-
-            varent.var = (ast_expression*)fld;
-            varent.name = util_strdup(fld->name);
-            (void)!parser_t_fields_add(parser, varent);
-
-            if (var->expression.vtype == TYPE_VECTOR)
-            {
-                /* create _x, _y and _z fields as well */
-                varentry_t ve[3];
-                if (!create_vector_members(parser, fld, ve)) {
-                    ast_delete(fld);
-                    return false;
-                }
-                (void)!parser_t_fields_add(parser, ve[0]);
-                (void)!parser_t_fields_add(parser, ve[1]);
-                (void)!parser_t_fields_add(parser, ve[2]);
-            }
-
-nextfield:
-            if (!parser_next(parser)) {
-                parseerror(parser, "expected semicolon or another field name");
-                return false;
-            }
-            if (parser->tok == ';')
-                break;
-            if (parser->tok != ',' || !parser_next(parser)) {
-                parseerror(parser, "expected semicolon or another field name");
-                return false;
-            }
-        }
-        ast_delete(typevar);
-
-        /* skip the semicolon */
-        if (!parser_next(parser))
-            return parser->tok == TOKEN_EOF;
-
-        return true;
-    }
     else if (parser->tok == '$')
     {
         if (!parser_next(parser)) {
@@ -2800,7 +2822,7 @@ nextfield:
     }
     else
     {
-        parseerror(parser, "unexpected token: %s", parser->lex->tok->value);
+        parseerror(parser, "unexpected token: %s", parser->lex->tok.value);
         return false;
     }
     return true;
@@ -2818,14 +2840,8 @@ bool parser_init()
     return true;
 }
 
-bool parser_compile(const char *filename)
+bool parser_compile()
 {
-    parser->lex = lex_open(filename);
-    if (!parser->lex) {
-        printf("failed to open file \"%s\"\n", filename);
-        return false;
-    }
-
     /* initial lexer/parser state */
     parser->lex->flags.noops = true;
 
@@ -2837,7 +2853,7 @@ bool parser_compile(const char *filename)
                 if (parser->tok == TOKEN_EOF)
                     parseerror(parser, "unexpected eof");
                 else if (!parser->errors)
-                    parseerror(parser, "parse error");
+                    parseerror(parser, "there have been errors, bailing out");
                 lex_close(parser->lex);
                 parser->lex = NULL;
                 return false;
@@ -2856,6 +2872,26 @@ bool parser_compile(const char *filename)
     return !parser->errors;
 }
 
+bool parser_compile_file(const char *filename)
+{
+    parser->lex = lex_open(filename);
+    if (!parser->lex) {
+        printf("failed to open file \"%s\"\n", filename);
+        return false;
+    }
+    return parser_compile();
+}
+
+bool parser_compile_string(const char *name, const char *str)
+{
+    parser->lex = lex_open_string(str, strlen(str), name);
+    if (!parser->lex) {
+        printf("failed to create lexer for string \"%s\"\n", name);
+        return false;
+    }
+    return parser_compile();
+}
+
 void parser_cleanup()
 {
     size_t i;
@@ -2890,6 +2926,78 @@ void parser_cleanup()
     mem_d(parser);
 }
 
+static uint16_t progdefs_crc_sum(uint16_t old, const char *str)
+{
+    return util_crc16(old, str, strlen(str));
+}
+
+static void progdefs_crc_file(const char *str)
+{
+    /* write to progdefs.h here */
+}
+
+static uint16_t progdefs_crc_both(uint16_t old, const char *str)
+{
+    old = progdefs_crc_sum(old, str);
+    progdefs_crc_file(str);
+    return old;
+}
+
+static void generate_checksum(parser_t *parser)
+{
+    uint16_t crc = 0xFFFF;
+    size_t i;
+
+       crc = progdefs_crc_both(crc, "\n/* file generated by qcc, do not modify */\n\ntypedef struct\n{");
+       crc = progdefs_crc_sum(crc, "\tint\tpad[28];\n");
+       /*
+       progdefs_crc_file("\tint\tpad;\n");
+       progdefs_crc_file("\tint\tofs_return[3];\n");
+       progdefs_crc_file("\tint\tofs_parm0[3];\n");
+       progdefs_crc_file("\tint\tofs_parm1[3];\n");
+       progdefs_crc_file("\tint\tofs_parm2[3];\n");
+       progdefs_crc_file("\tint\tofs_parm3[3];\n");
+       progdefs_crc_file("\tint\tofs_parm4[3];\n");
+       progdefs_crc_file("\tint\tofs_parm5[3];\n");
+       progdefs_crc_file("\tint\tofs_parm6[3];\n");
+       progdefs_crc_file("\tint\tofs_parm7[3];\n");
+       */
+       for (i = 0; i < parser->crc_globals; ++i) {
+           if (!ast_istype(parser->globals[i].var, ast_value))
+               continue;
+           switch (parser->globals[i].var->expression.vtype) {
+               case TYPE_FLOAT:    crc = progdefs_crc_both(crc, "\tfloat\t"); break;
+               case TYPE_VECTOR:   crc = progdefs_crc_both(crc, "\tvec3_t\t"); break;
+               case TYPE_STRING:   crc = progdefs_crc_both(crc, "\tstring_t\t"); break;
+               case TYPE_FUNCTION: crc = progdefs_crc_both(crc, "\tfunc_t\t"); break;
+               default:
+                   crc = progdefs_crc_both(crc, "\tint\t");
+                   break;
+           }
+           crc = progdefs_crc_both(crc, parser->globals[i].name);
+           crc = progdefs_crc_both(crc, ";\n");
+       }
+       crc = progdefs_crc_both(crc, "} globalvars_t;\n\ntypedef struct\n{\n");
+       for (i = 0; i < parser->crc_fields; ++i) {
+           if (!ast_istype(parser->fields[i].var, ast_value))
+               continue;
+           switch (parser->fields[i].var->expression.next->expression.vtype) {
+               case TYPE_FLOAT:    crc = progdefs_crc_both(crc, "\tfloat\t"); break;
+               case TYPE_VECTOR:   crc = progdefs_crc_both(crc, "\tvec3_t\t"); break;
+               case TYPE_STRING:   crc = progdefs_crc_both(crc, "\tstring_t\t"); break;
+               case TYPE_FUNCTION: crc = progdefs_crc_both(crc, "\tfunc_t\t"); break;
+               default:
+                   crc = progdefs_crc_both(crc, "\tint\t");
+                   break;
+           }
+           crc = progdefs_crc_both(crc, parser->fields[i].name);
+           crc = progdefs_crc_both(crc, ";\n");
+       }
+       crc = progdefs_crc_both(crc, "} entvars_t;\n\n");
+
+       code_crc = crc;
+}
+
 bool parser_finish(const char *output)
 {
     size_t i;
@@ -2936,8 +3044,12 @@ bool parser_finish(const char *output)
                 continue;
             asvalue = (ast_value*)(parser->globals[i].var);
             if (!asvalue->uses && !asvalue->isconst && asvalue->expression.vtype != TYPE_FUNCTION) {
-                retval = retval && !genwarning(ast_ctx(asvalue), WARN_UNUSED_VARIABLE,
-                                               "unused global: `%s`", asvalue->name);
+                if (strcmp(asvalue->name, "end_sys_globals") &&
+                    strcmp(asvalue->name, "end_sys_fields"))
+                {
+                    retval = retval && !genwarning(ast_ctx(asvalue), WARN_UNUSED_VARIABLE,
+                                                   "unused global: `%s`", asvalue->name);
+                }
             }
             if (!ast_global_codegen(asvalue, ir)) {
                 printf("failed to generate global %s\n", parser->globals[i].name);
@@ -2983,6 +3095,8 @@ bool parser_finish(const char *output)
             if (opts_dump)
                 ir_builder_dump(ir, printf);
 
+            generate_checksum(parser);
+
             if (!ir_builder_generate(ir, output)) {
                 printf("*** failed to generate output file\n");
                 ir_builder_delete(ir);