diff --git a/oberon.c b/oberon.c
index f4a711f5da3156912e43afb4bc8887dd076936a3..6dd84f16b6b9c3108973c087636865c661735bc3 100644 (file)
--- a/oberon.c
+++ b/oberon.c
RBRACE,
RECORD,
POINTER,
- TO
+ TO,
+ UPARROW,
+ NIL
};
// =======================================================================
scope -> list = list;
scope -> up = ctx -> decl;
+ if(scope -> up)
+ {
+ scope -> parent = scope -> up -> parent;
+ scope -> local = scope -> up -> local;
+ }
+
ctx -> decl = scope;
return scope;
}
memset(newvar, 0, sizeof *newvar);
newvar -> name = name;
newvar -> class = class;
+ newvar -> local = scope -> local;
+ newvar -> parent = scope -> parent;
x -> next = newvar;
static void
oberon_define_field(oberon_context_t * ctx, oberon_type_t * rec, char * name, oberon_type_t * type)
{
+ // TODO check base fields
+
oberon_object_t * x = rec -> decl;
while(x -> next && strcmp(x -> next -> name, name) != 0)
{
field -> name = name;
field -> class = OBERON_CLASS_FIELD;
field -> type = type;
+ field -> local = 1;
+ field -> parent = NULL;
rec -> num_decl += 1;
x -> next = field;
}
*/
+/*
static oberon_object_t *
oberon_define_proc(oberon_scope_t * scope, char * name, oberon_type_t * signature)
{
@@ -280,6 +295,7 @@ oberon_define_proc(oberon_scope_t * scope, char * name, oberon_type_t * signatur
proc -> type = signature;
return proc;
}
+*/
// =======================================================================
// SCANER
{
ctx -> token = TO;
}
+ else if(strcmp(ident, "NIL") == 0)
+ {
+ ctx -> token = NIL;
+ }
}
static void
ctx -> token = RBRACE;
oberon_get_char(ctx);
break;
+ case '^':
+ ctx -> token = UPARROW;
+ oberon_get_char(ctx);
+ break;
default:
oberon_error(ctx, "invalid char");
break;
static void oberon_assert_token(oberon_context_t * ctx, int token);
static char * oberon_assert_ident(oberon_context_t * ctx);
static void oberon_type(oberon_context_t * ctx, oberon_type_t ** type);
+static oberon_item_t * oberon_const_expr(oberon_context_t * ctx);
static oberon_expr_t *
oberon_new_operator(int op, oberon_type_t * result, oberon_expr_t * left, oberon_expr_t * right)
}
static void
-oberon_expr_list(oberon_context_t * ctx, int * num_expr, oberon_expr_t ** first)
+oberon_expr_list(oberon_context_t * ctx, int * num_expr, oberon_expr_t ** first, int const_expr)
{
oberon_expr_t * last;
@@ -638,7 +663,16 @@ oberon_expr_list(oberon_context_t * ctx, int * num_expr, oberon_expr_t ** first)
{
oberon_assert_token(ctx, COMMA);
oberon_expr_t * current;
- current = oberon_expr(ctx);
+
+ if(const_expr)
+ {
+ current = (oberon_expr_t *) oberon_const_expr(ctx);
+ }
+ else
+ {
+ current = oberon_expr(ctx);
+ }
+
last -> next = current;
last = current;
*num_expr += 1;
@@ -653,7 +687,6 @@ oberon_autocast_to(oberon_context_t * ctx, oberon_expr_t * expr, oberon_type_t *
oberon_error(ctx, "incompatible types");
}
-
if(pref -> class == OBERON_TYPE_INTEGER)
{
if(expr -> result -> class > pref -> class)
@@ -669,6 +702,16 @@ oberon_autocast_to(oberon_context_t * ctx, oberon_expr_t * expr, oberon_type_t *
oberon_error(ctx, "incompatible record types");
}
}
+ else if(pref -> class == OBERON_TYPE_POINTER)
+ {
+ if(expr -> result -> base != pref -> base)
+ {
+ if(expr -> result -> base -> class != OBERON_TYPE_VOID)
+ {
+ oberon_error(ctx, "incompatible pointer types");
+ }
+ }
+ }
// TODO cast
oberon_object_t * param = fn -> decl;
for(int i = 0; i < num_args; i++)
{
+ if(param -> class == OBERON_CLASS_VAR_PARAM)
+ {
+ if(arg -> is_item)
+ {
+ switch(arg -> item.mode)
+ {
+ case MODE_VAR:
+ case MODE_INDEX:
+ case MODE_FIELD:
+ // Допустимо разыменование?
+ //case MODE_DEREF:
+ break;
+ default:
+ oberon_error(ctx, "var-parameter accept only variables");
+ break;
+ }
+ }
+ }
oberon_autocast_to(ctx, arg, param -> type);
arg = arg -> next;
param = param -> next;
}
}
+static oberon_expr_t *
+oberon_make_call_func(oberon_context_t * ctx, oberon_object_t * proc, int num_args, oberon_expr_t * list_args)
+{
+ if(proc -> class != OBERON_CLASS_PROC)
+ {
+ oberon_error(ctx, "not a procedure");
+ }
+
+ oberon_expr_t * call;
+
+ if(proc -> sysproc)
+ {
+ if(proc -> genfunc == NULL)
+ {
+ oberon_error(ctx, "not a function-procedure");
+ }
+
+ call = proc -> genfunc(ctx, num_args, list_args);
+ }
+ else
+ {
+ if(proc -> type -> base -> class == OBERON_TYPE_VOID)
+ {
+ oberon_error(ctx, "attempt to call procedure in expression");
+ }
+
+ call = oberon_new_item(MODE_CALL, proc -> type -> base);
+ call -> item.var = proc;
+ call -> item.num_args = num_args;
+ call -> item.args = list_args;
+ oberon_autocast_call(ctx, call);
+ }
+
+ return call;
+}
+
+static void
+oberon_make_call_proc(oberon_context_t * ctx, oberon_object_t * proc, int num_args, oberon_expr_t * list_args)
+{
+ if(proc -> class != OBERON_CLASS_PROC)
+ {
+ oberon_error(ctx, "not a procedure");
+ }
+
+ if(proc -> sysproc)
+ {
+ if(proc -> genproc == NULL)
+ {
+ oberon_error(ctx, "requres non-typed procedure");
+ }
+
+ proc -> genproc(ctx, num_args, list_args);
+ }
+ else
+ {
+ if(proc -> type -> base -> class != OBERON_TYPE_VOID)
+ {
+ oberon_error(ctx, "attempt to call function as non-typed procedure");
+ }
+
+ oberon_expr_t * call;
+ call = oberon_new_item(MODE_CALL, proc -> type -> base);
+ call -> item.var = proc;
+ call -> item.num_args = num_args;
+ call -> item.args = list_args;
+ oberon_autocast_call(ctx, call);
+ oberon_generate_call_proc(ctx, call);
+ }
+}
+
#define ISEXPR(x) \
(((x) == PLUS) \
|| ((x) == MINUS) \
|| ((x) == TRUE) \
|| ((x) == FALSE))
-#define ISSELECTOR(x) \
- (((x) == LBRACE) \
- || ((x) == DOT))
-
static oberon_expr_t *
-oberon_make_array_selector(oberon_context_t * ctx, oberon_expr_t * desig, int num_indexes, oberon_expr_t * indexes)
+oberno_make_dereferencing(oberon_context_t * ctx, oberon_expr_t * expr)
{
- assert(desig -> is_item == 1);
-
- if(desig -> item.mode != MODE_VAR)
+ if(expr -> result -> class != OBERON_TYPE_POINTER)
{
- oberon_error(ctx, "not MODE_VAR");
+ oberon_error(ctx, "not a pointer");
}
- int class = desig -> item.var -> class;
- switch(class)
+ assert(expr -> is_item);
+
+ oberon_expr_t * selector;
+ selector = oberon_new_item(MODE_DEREF, expr -> result -> base);
+ selector -> item.parent = (oberon_item_t *) expr;
+
+ return selector;
+}
+
+static oberon_expr_t *
+oberon_make_array_selector(oberon_context_t * ctx, oberon_expr_t * desig, oberon_expr_t * index)
+{
+ if(desig -> result -> class == OBERON_TYPE_POINTER)
{
- case OBERON_CLASS_VAR:
- case OBERON_CLASS_VAR_PARAM:
- case OBERON_CLASS_PARAM:
- break;
- default:
- oberon_error(ctx, "not variable");
- break;
+ desig = oberno_make_dereferencing(ctx, desig);
}
- oberon_type_t * type = desig -> item.var -> type;
- if(type -> class != OBERON_TYPE_ARRAY)
+ assert(desig -> is_item);
+
+ if(desig -> result -> class != OBERON_TYPE_ARRAY)
{
oberon_error(ctx, "not array");
}
-// int dim = desig -> item.var -> type -> dim;
-// if(num_indexes != dim)
-// {
-// oberon_error(ctx, "dimesions not matched");
-// }
+ oberon_type_t * base;
+ base = desig -> result -> base;
- oberon_type_t * base = desig -> item.var -> type -> base;
+ if(index -> result -> class != OBERON_TYPE_INTEGER)
+ {
+ oberon_error(ctx, "index must be integer");
+ }
+
+ // Статическая проверка границ массива
+ if(index -> is_item)
+ {
+ if(index -> item.mode == MODE_INTEGER)
+ {
+ int arr_size = desig -> result -> size;
+ int index_int = index -> item.integer;
+ if(index_int < 0 || index_int > arr_size - 1)
+ {
+ oberon_error(ctx, "not in range (dimension size 0..%i)", arr_size - 1);
+ }
+ }
+ }
oberon_expr_t * selector;
selector = oberon_new_item(MODE_INDEX, base);
selector -> item.parent = (oberon_item_t *) desig;
- selector -> item.num_args = num_indexes;
- selector -> item.args = indexes;
+ selector -> item.num_args = 1;
+ selector -> item.args = index;
return selector;
}
@@ -778,10 +923,14 @@ oberon_make_array_selector(oberon_context_t * ctx, oberon_expr_t * desig, int nu
static oberon_expr_t *
oberon_make_record_selector(oberon_context_t * ctx, oberon_expr_t * expr, char * name)
{
+ if(expr -> result -> class == OBERON_TYPE_POINTER)
+ {
+ expr = oberno_make_dereferencing(ctx, expr);
+ }
+
assert(expr -> is_item == 1);
- int class = expr -> result -> class;
- if(class != OBERON_TYPE_RECORD)
+ if(expr -> result -> class != OBERON_TYPE_RECORD)
{
oberon_error(ctx, "not record");
}
@@ -799,6 +948,11 @@ oberon_make_record_selector(oberon_context_t * ctx, oberon_expr_t * expr, char *
return selector;
}
+#define ISSELECTOR(x) \
+ (((x) == LBRACE) \
+ || ((x) == DOT) \
+ || ((x) == UPARROW))
+
static oberon_expr_t *
oberon_designator(oberon_context_t * ctx)
{
expr = oberon_new_item(MODE_VAR, var -> type);
break;
case OBERON_CLASS_PROC:
+ //expr = oberon_make_call_expr(var, 0, NULL);
expr = oberon_new_item(MODE_CALL, var -> type);
break;
default:
oberon_assert_token(ctx, LBRACE);
int num_indexes = 0;
oberon_expr_t * indexes = NULL;
- oberon_expr_list(ctx, &num_indexes, &indexes);
+ oberon_expr_list(ctx, &num_indexes, &indexes, 0);
oberon_assert_token(ctx, RBRACE);
- expr = oberon_make_array_selector(ctx, expr, num_indexes, indexes);
+
+ for(int i = 0; i < num_indexes; i++)
+ {
+ expr = oberon_make_array_selector(ctx, expr, indexes);
+ indexes = indexes -> next;
+ }
+ break;
+ case UPARROW:
+ oberon_assert_token(ctx, UPARROW);
+ expr = oberno_make_dereferencing(ctx, expr);
break;
default:
oberon_error(ctx, "oberon_designator: wat");
}
static oberon_expr_t *
-oberon_opt_proc_parens(oberon_context_t * ctx, oberon_expr_t * expr)
+oberon_opt_func_parens(oberon_context_t * ctx, oberon_expr_t * expr)
{
assert(expr -> is_item == 1);
if(ctx -> token == LPAREN)
{
- if(expr -> result -> class != OBERON_TYPE_PROCEDURE)
+ oberon_assert_token(ctx, LPAREN);
+
+ int num_args = 0;
+ oberon_expr_t * arguments = NULL;
+
+ if(ISEXPR(ctx -> token))
{
- oberon_error(ctx, "not a procedure");
+ oberon_expr_list(ctx, &num_args, &arguments, 0);
}
+ expr = oberon_make_call_func(ctx, expr -> item.var, num_args, arguments);
+
+ oberon_assert_token(ctx, RPAREN);
+ }
+
+ return expr;
+}
+
+static void
+oberon_opt_proc_parens(oberon_context_t * ctx, oberon_expr_t * expr)
+{
+ assert(expr -> is_item == 1);
+
+ if(ctx -> token == LPAREN)
+ {
oberon_assert_token(ctx, LPAREN);
int num_args = 0;
if(ISEXPR(ctx -> token))
{
- oberon_expr_list(ctx, &num_args, &arguments);
+ oberon_expr_list(ctx, &num_args, &arguments, 0);
}
- expr -> result = expr -> item.var -> type -> base;
- expr -> item.mode = MODE_CALL;
- expr -> item.num_args = num_args;
- expr -> item.args = arguments;
- oberon_assert_token(ctx, RPAREN);
+ oberon_make_call_proc(ctx, expr -> item.var, num_args, arguments);
- oberon_autocast_call(ctx, expr);
+ oberon_assert_token(ctx, RPAREN);
}
-
- return expr;
}
static oberon_expr_t *
{
case IDENT:
expr = oberon_designator(ctx);
- expr = oberon_opt_proc_parens(ctx, expr);
+ expr = oberon_opt_func_parens(ctx, expr);
break;
case INTEGER:
expr = oberon_new_item(MODE_INTEGER, ctx -> int_type);
expr = oberon_factor(ctx);
expr = oberon_make_unary_op(ctx, NOT, expr);
break;
+ case NIL:
+ oberon_assert_token(ctx, NIL);
+ expr = oberon_new_item(MODE_NIL, ctx -> void_ptr_type);
+ break;
default:
oberon_error(ctx, "invalid expression");
}
// PARSER
// =======================================================================
+static void oberon_decl_seq(oberon_context_t * ctx);
static void oberon_statement_seq(oberon_context_t * ctx);
+static void oberon_initialize_decl(oberon_context_t * ctx);
static void
oberon_expect_token(oberon_context_t * ctx, int token)
if(ctx -> token == COLON)
{
oberon_assert_token(ctx, COLON);
+ // TODO get by qualident
oberon_type(ctx, &signature -> base);
}
}
}
}
+static void
+oberon_compare_signatures(oberon_context_t * ctx, oberon_type_t * a, oberon_type_t * b)
+{
+ if(a -> num_decl != b -> num_decl)
+ {
+ oberon_error(ctx, "number parameters not matched");
+ }
+
+ int num_param = a -> num_decl;
+ oberon_object_t * param_a = a -> decl;
+ oberon_object_t * param_b = b -> decl;
+ for(int i = 0; i < num_param; i++)
+ {
+ if(strcmp(param_a -> name, param_b -> name) != 0)
+ {
+ oberon_error(ctx, "param %i name not matched", i + 1);
+ }
+
+ if(param_a -> type != param_b -> type)
+ {
+ oberon_error(ctx, "param %i type not matched", i + 1);
+ }
+
+ param_a = param_a -> next;
+ param_b = param_b -> next;
+ }
+}
+
static void
oberon_make_return(oberon_context_t * ctx, oberon_expr_t * expr)
{
- if(ctx -> result_type -> class == OBERON_TYPE_VOID)
+ oberon_object_t * proc = ctx -> decl -> parent;
+ oberon_type_t * result_type = proc -> type -> base;
+
+ if(result_type -> class == OBERON_TYPE_VOID)
{
if(expr != NULL)
{
oberon_error(ctx, "procedure requires expression on result");
}
- oberon_autocast_to(ctx, expr, ctx -> result_type);
+ oberon_autocast_to(ctx, expr, result_type);
}
- ctx -> has_return = 1;
+ proc -> has_return = 1;
oberon_generate_return(ctx, expr);
}
static void
-oberon_proc_decl(oberon_context_t * ctx)
+oberon_proc_decl_body(oberon_context_t * ctx, oberon_object_t * proc)
{
- oberon_assert_token(ctx, PROCEDURE);
-
- char * name;
- name = oberon_assert_ident(ctx);
-
- oberon_scope_t * this_proc_def_scope = ctx -> decl;
- oberon_open_scope(ctx);
-
- oberon_type_t * signature;
- signature = oberon_new_type_ptr(OBERON_TYPE_VOID);
- oberon_opt_formal_pars(ctx, &signature);
-
- oberon_object_t * proc;
- proc = oberon_define_proc(this_proc_def_scope, name, signature);
+ oberon_assert_token(ctx, SEMICOLON);
- ctx -> result_type = signature -> base;
- ctx -> has_return = 0;
+ ctx -> decl = proc -> scope;
- oberon_assert_token(ctx, SEMICOLON);
+ oberon_decl_seq(ctx);
oberon_generate_begin_proc(ctx, proc);
- // TODO declarations
-
if(ctx -> token == BEGIN)
{
oberon_assert_token(ctx, BEGIN);
}
oberon_assert_token(ctx, END);
- char * name2 = oberon_assert_ident(ctx);
- if(strcmp(name2, name) != 0)
+ char * name = oberon_assert_ident(ctx);
+ if(strcmp(name, proc -> name) != 0)
{
oberon_error(ctx, "procedure name not matched");
}
- if(signature -> base -> class == OBERON_TYPE_VOID)
+ if(proc -> type -> base -> class == OBERON_TYPE_VOID
+ && proc -> has_return == 0)
{
oberon_make_return(ctx, NULL);
}
- if(ctx -> has_return == 0)
+ if(proc -> has_return == 0)
{
oberon_error(ctx, "procedure requires return");
}
- ctx -> result_type = NULL;
oberon_generate_end_proc(ctx);
oberon_close_scope(ctx -> decl);
}
+static void
+oberon_proc_decl(oberon_context_t * ctx)
+{
+ oberon_assert_token(ctx, PROCEDURE);
+
+ int forward = 0;
+ if(ctx -> token == UPARROW)
+ {
+ oberon_assert_token(ctx, UPARROW);
+ forward = 1;
+ }
+
+ char * name;
+ name = oberon_assert_ident(ctx);
+
+ oberon_scope_t * proc_scope;
+ proc_scope = oberon_open_scope(ctx);
+ ctx -> decl -> local = 1;
+
+ oberon_type_t * signature;
+ signature = oberon_new_type_ptr(OBERON_TYPE_VOID);
+ oberon_opt_formal_pars(ctx, &signature);
+
+ oberon_initialize_decl(ctx);
+ oberon_generator_init_type(ctx, signature);
+ oberon_close_scope(ctx -> decl);
+
+ oberon_object_t * proc;
+ proc = oberon_find_object(ctx -> decl, name, 0);
+ if(proc != NULL)
+ {
+ if(proc -> class != OBERON_CLASS_PROC)
+ {
+ oberon_error(ctx, "mult definition");
+ }
+
+ if(forward == 0)
+ {
+ if(proc -> linked)
+ {
+ oberon_error(ctx, "mult procedure definition");
+ }
+ }
+
+ oberon_compare_signatures(ctx, proc -> type, signature);
+ }
+ else
+ {
+ proc = oberon_define_object(ctx -> decl, name, OBERON_CLASS_PROC);
+ proc -> type = signature;
+ proc -> scope = proc_scope;
+ oberon_generator_init_proc(ctx, proc);
+ }
+
+ proc -> scope -> parent = proc;
+
+ if(forward == 0)
+ {
+ proc -> linked = 1;
+ oberon_proc_decl_body(ctx, proc);
+ }
+}
+
static void
oberon_const_decl(oberon_context_t * ctx)
{
}
static void
-oberon_make_array_type(oberon_context_t * ctx, oberon_item_t * size, oberon_type_t * base, oberon_type_t ** type)
+oberon_make_array_type(oberon_context_t * ctx, oberon_expr_t * size, oberon_type_t * base, oberon_type_t ** type)
{
- if(size -> mode != MODE_INTEGER)
+ if(size -> is_item == 0)
+ {
+ oberon_error(ctx, "requires constant");
+ }
+
+ if(size -> item.mode != MODE_INTEGER)
{
oberon_error(ctx, "requires integer constant");
}
@@ -1409,7 +1677,7 @@ oberon_make_array_type(oberon_context_t * ctx, oberon_item_t * size, oberon_type
oberon_type_t * arr;
arr = *type;
arr -> class = OBERON_TYPE_ARRAY;
- arr -> size = size -> integer;
+ arr -> size = size -> item.integer;
arr -> base = base;
}
@@ -1460,6 +1728,23 @@ static void oberon_opt_formal_pars(oberon_context_t * ctx, oberon_type_t ** type
* Правило граматики "type". Указатель type должен указывать на существующий объект!
*/
+static void
+oberon_make_multiarray(oberon_context_t * ctx, oberon_expr_t * sizes, oberon_type_t * base, oberon_type_t ** type)
+{
+ if(sizes == NULL)
+ {
+ *type = base;
+ return;
+ }
+
+ oberon_type_t * dim;
+ dim = oberon_new_type_ptr(OBERON_TYPE_VOID);
+
+ oberon_make_multiarray(ctx, sizes -> next, base, &dim);
+
+ oberon_make_array_type(ctx, sizes, dim, type);
+}
+
static void
oberon_type(oberon_context_t * ctx, oberon_type_t ** type)
{
{
oberon_assert_token(ctx, ARRAY);
- oberon_item_t * size;
- size = oberon_const_expr(ctx);
+ int num_sizes = 0;
+ oberon_expr_t * sizes;
+ oberon_expr_list(ctx, &num_sizes, &sizes, 1);
oberon_assert_token(ctx, OF);
base = oberon_new_type_ptr(OBERON_TYPE_VOID);
oberon_type(ctx, &base);
- oberon_make_array_type(ctx, size, base, type);
+ oberon_make_multiarray(ctx, sizes, base, type);
}
else if(ctx -> token == RECORD)
{
if(type -> class == OBERON_TYPE_POINTER)
{
- if(type -> base -> class == OBERON_TYPE_RECORD)
- {
- oberon_generator_init_type(ctx, type -> base);
- oberon_generator_init_type(ctx, type);
- }
- else
- {
- oberon_initialize_type(ctx, type -> base);
- oberon_generator_init_type(ctx, type);
- }
+ oberon_initialize_type(ctx, type -> base);
+ oberon_generator_init_type(ctx, type);
}
else if(type -> class == OBERON_TYPE_ARRAY)
{
static void
oberon_initialize_object(oberon_context_t * ctx, oberon_object_t * x)
{
- printf("oberon_initialize_object: name %s class %i\n", x -> name, x -> class);
+ if(x -> initialized)
+ {
+ return;
+ }
+
+ x -> initialized = 1;
+
switch(x -> class)
{
case OBERON_CLASS_TYPE:
}
}
+static void
+oberon_prevent_undeclarated_procedures(oberon_context_t * ctx)
+{
+ oberon_object_t * x = ctx -> decl -> list;
+
+ while(x -> next)
+ {
+ if(x -> next -> class == OBERON_CLASS_PROC)
+ {
+ if(x -> next -> linked == 0)
+ {
+ oberon_error(ctx, "unresolved forward declaration");
+ }
+ }
+ x = x -> next;
+ }
+}
+
static void
oberon_decl_seq(oberon_context_t * ctx)
{
oberon_proc_decl(ctx);
oberon_assert_token(ctx, SEMICOLON);
}
+
+ oberon_prevent_undeclarated_procedures(ctx);
}
static void
@@ -1899,13 +2203,6 @@ oberon_assign(oberon_context_t * ctx, oberon_expr_t * src, oberon_expr_t * dst)
oberon_generate_assign(ctx, src, dst);
}
-static void
-oberon_make_call(oberon_context_t * ctx, oberon_expr_t * desig)
-{
- oberon_autocast_call(ctx, desig);
- oberon_generate_call_proc(ctx, desig);
-}
-
static void
oberon_statement(oberon_context_t * ctx)
{
}
else
{
- item1 = oberon_opt_proc_parens(ctx, item1);
- oberon_make_call(ctx, item1);
+ oberon_opt_proc_parens(ctx, item1);
}
}
else if(ctx -> token == RETURN)
ctx -> void_type = oberon_new_type_ptr(OBERON_TYPE_VOID);
oberon_generator_init_type(ctx, ctx -> void_type);
+ ctx -> void_ptr_type = oberon_new_type_ptr(OBERON_TYPE_POINTER);
+ ctx -> void_ptr_type -> base = ctx -> void_type;
+ oberon_generator_init_type(ctx, ctx -> void_ptr_type);
+
ctx -> int_type = oberon_new_type_integer(sizeof(int));
oberon_define_type(ctx -> world_scope, "INTEGER", ctx -> int_type);
oberon_define_type(ctx -> world_scope, "BOOLEAN", ctx -> bool_type);
}
+static void
+oberon_new_intrinsic_function(oberon_context_t * ctx, char * name, GenerateFuncCallback generate)
+{
+ oberon_object_t * proc;
+ proc = oberon_define_object(ctx -> decl, name, OBERON_CLASS_PROC);
+ proc -> sysproc = 1;
+ proc -> genfunc = generate;
+ proc -> type = oberon_new_type_ptr(OBERON_TYPE_PROCEDURE);
+}
+
+/*
+static void
+oberon_new_intrinsic_procedure(oberon_context_t * ctx, char * name, GenerateProcCallback generate)
+{
+ oberon_object_t * proc;
+ proc = oberon_define_object(ctx -> decl, name, OBERON_CLASS_PROC);
+ proc -> sysproc = 1;
+ proc -> genproc = generate;
+ proc -> type = oberon_new_type_ptr(OBERON_TYPE_PROCEDURE);
+}
+*/
+
+static oberon_expr_t *
+oberon_make_abs_call(oberon_context_t * ctx, int num_args, oberon_expr_t * list_args)
+{
+ if(num_args < 1)
+ {
+ oberon_error(ctx, "too few arguments");
+ }
+
+ if(num_args > 1)
+ {
+ oberon_error(ctx, "too mach arguments");
+ }
+
+ oberon_expr_t * arg;
+ arg = list_args;
+
+ oberon_type_t * result_type;
+ result_type = arg -> result;
+
+ if(result_type -> class != OBERON_TYPE_INTEGER)
+ {
+ oberon_error(ctx, "ABS accepts only integers");
+ }
+
+
+ oberon_expr_t * expr;
+ expr = oberon_new_operator(OP_ABS, result_type, arg, NULL);
+ return expr;
+}
+
oberon_context_t *
oberon_create_context()
{
oberon_generator_init_context(ctx);
- register_default_types(ctx);
+ register_default_types(ctx);
+ oberon_new_intrinsic_function(ctx, "ABS", oberon_make_abs_call);
return ctx;
}