INLINE void
_syx_memory_gc_mark (SyxOop object)
{
syx_varsize i;
if (!SYX_IS_OBJECT (object) || SYX_OBJECT_IS_MARKED(object) || SYX_IS_NIL(syx_object_get_class (object)))
return;
SYX_OBJECT_IS_MARKED(object) = TRUE;
_syx_memory_gc_mark (SYX_OBJECT(object)->klass);
/* Only the used stack part of the process must be marked */
if (SYX_OOP_EQ (syx_object_get_class (object), syx_process_class))
{
SyxOop stack = SYX_PROCESS_STACK (object);
SyxInterpFrame *frame = SYX_OOP_CAST_POINTER (SYX_PROCESS_FRAME_POINTER (object));
syx_int32 offset = SYX_POINTERS_OFFSET (frame->stack,
SYX_OBJECT_DATA (stack));
SYX_OBJECT_IS_MARKED(stack) = TRUE;
/* First mark variables except the process stack */
for (i=0; i < SYX_VARS_PROCESS_STACK; i++)
_syx_memory_gc_mark (SYX_OBJECT_VARS(object)[i]);
/* Mark detached frames */
while (frame)
{
_syx_memory_gc_mark (frame->detached_frame);
frame = frame->parent_frame;
}
/* Now mark the stack */
for (i=0; i < offset; i++)
_syx_memory_gc_mark (SYX_OBJECT_DATA(stack)[i]);
/* Mark variables after the process stack */
for (i=SYX_VARS_PROCESS_STACK+1; i < syx_object_vars_size (object); i++)
_syx_memory_gc_mark (SYX_OBJECT_VARS(object)[i]);
/* Process has no data */
return;
}
else
{
for (i=0; i < syx_object_vars_size (object); i++)
_syx_memory_gc_mark (SYX_OBJECT_VARS(object)[i]);
}
if (SYX_OBJECT_HAS_REFS (object))
{
for (i=0; i < SYX_OBJECT_DATA_SIZE (object); i++)
_syx_memory_gc_mark (SYX_OBJECT_DATA(object)[i]);
}
}
/*!
Enters a new MethodContext or BlockContext.
\return FALSE if the context was syx_nil
*/
syx_bool
syx_interp_enter_context (SyxOop process, SyxOop context)
{
SyxOop arguments;
syx_bool reset_parent_frame = FALSE;
SyxInterpState _state = SYX_INTERP_STATE_NEW;
SyxInterpState *state;
SyxInterpFrame *frame;
if (SYX_IS_NIL (process) || SYX_IS_NIL (context))
return FALSE;
if (SYX_OOP_EQ (process, _syx_interp_state.process))
state = &_syx_interp_state;
else
{
state = &_state;
frame = SYX_OOP_CAST_POINTER (SYX_PROCESS_FRAME_POINTER (process));
/* This is a new Process, reset the parent_frame once we created the frame */
if (SYX_IS_NIL (frame->method))
reset_parent_frame = TRUE;
state->frame = frame;
state->process = process;
}
arguments = SYX_CONTEXT_PART_ARGUMENTS (context);
if (SYX_IS_NIL (arguments))
state->message_arguments_count = 0;
else
{
state->message_arguments_count = SYX_OBJECT_DATA_SIZE (arguments);
memcpy (state->message_arguments, SYX_OBJECT_DATA (arguments), state->message_arguments_count * sizeof (SyxOop));
}
if (SYX_OOP_EQ (syx_object_get_class (context), syx_block_context_class))
_syx_interp_frame_prepare_new_closure (state, SYX_BLOCK_CONTEXT_CLOSURE (context));
else
{
state->message_receiver = SYX_METHOD_CONTEXT_RECEIVER (context);
_syx_interp_frame_prepare_new (state, SYX_CONTEXT_PART_METHOD (context));
}
if (reset_parent_frame)
state->frame->stack_return_frame = state->frame->parent_frame = NULL;
state->frame->this_context = context;
SYX_CONTEXT_PART_FRAME_POINTER (context) = SYX_POINTER_CAST_OOP (state->frame);
_syx_interp_save_process_state (state);
return TRUE;
}
/* Fetches and updates the execution state of the interpreter to be ready for next instructions */
static void
_syx_interp_state_update (SyxInterpState *state, SyxInterpFrame *frame)
{
SyxOop bytecodes;
SyxOop method = frame->method;;
state->frame = frame;
bytecodes = SYX_CODE_BYTECODES (method);
state->arguments = &frame->local;
state->temporaries = state->arguments + SYX_SMALL_INTEGER (SYX_CODE_ARGUMENTS_COUNT (method));
state->method_literals = SYX_OBJECT_DATA (SYX_CODE_LITERALS (method));
state->method_bytecodes = (syx_uint16 *)SYX_OBJECT_DATA (bytecodes);
state->method_bytecodes_count = SYX_OBJECT_DATA_SIZE (bytecodes);
}
/* Dump a single frame */
static void
_syx_memory_write_frame (SyxObject *process, SyxInterpFrame *frame, SyxInterpFrame *upper_frame, FILE *image)
{
syx_int32 data;
SyxInterpFrame *bottom_frame;
if (!process)
bottom_frame = NULL;
else
bottom_frame = (SyxInterpFrame *)SYX_OBJECT_DATA (process->vars[SYX_VARS_PROCESS_STACK]);
_syx_memory_write (&frame->this_context, FALSE, 1, image);
_syx_memory_write (&frame->detached_frame, FALSE, 1, image);
_syx_memory_write_lazy_pointer (process, frame->parent_frame, image);
_syx_memory_write_lazy_pointer (process, frame->outer_frame, image);
_syx_memory_write_lazy_pointer (process, frame->stack_return_frame, image);
_syx_memory_write (&frame->method, FALSE, 1, image);
_syx_memory_write (&frame->closure, FALSE, 1, image);
/* this is not a SmallInteger */
data = SYX_COMPAT_SWAP_32 (frame->next_instruction);
fwrite (&data, sizeof (syx_int32), 1, image);
/* the stack pointer should point inside the process stack itself */
if (process)
_syx_memory_write (&process->vars[SYX_VARS_PROCESS_STACK], FALSE, 1, image);
else
{
data = SYX_COMPAT_SWAP_32 (0);
fwrite (&data, sizeof (syx_int32), 1, image);
}
data = SYX_COMPAT_SWAP_32 (SYX_POINTERS_OFFSET (frame->stack, bottom_frame));
fwrite (&data, sizeof (syx_int32), 1, image);
_syx_memory_write (&frame->receiver, TRUE, 1, image);
/* Store arguments, temporaries and local stack.
Only copy arguments and temporaries for detached frames without following the stack pointer */
if (SYX_IS_NIL (frame->detached_frame))
{
/* if no upper_frame is given, this frame is the top most frame of the process stack */
if (!upper_frame)
data = SYX_POINTERS_OFFSET (frame->stack, &frame->local);
else
data = SYX_POINTERS_OFFSET (upper_frame, &frame->local);
}
else
data = SYX_OBJECT_DATA_SIZE (frame->detached_frame) - SYX_POINTERS_OFFSET (&frame->local, frame);
data = SYX_COMPAT_SWAP_32 (data);
fwrite (&data, sizeof (syx_int32), 1, image);
_syx_memory_write (&frame->local, TRUE, SYX_COMPAT_SWAP_32 (data), image);
}
INLINE void
_syx_memory_gc_mark (SyxOop object)
{
syx_varsize i;
if (!SYX_IS_OBJECT (object) || SYX_OBJECT_IS_MARKED(object) || SYX_IS_NIL(syx_object_get_class (object)))
return;
SYX_OBJECT_IS_MARKED(object) = TRUE;
_syx_memory_gc_mark (SYX_OBJECT(object)->klass);
for (i=0; i < syx_object_vars_size (object); i++)
_syx_memory_gc_mark (SYX_OBJECT_VARS(object)[i]);
if (SYX_OBJECT_HAS_REFS (object))
{
for (i=0; i < SYX_OBJECT_DATA_SIZE (object); i++)
_syx_memory_gc_mark (SYX_OBJECT_DATA(object)[i]);
}
}
static syx_bool
_syx_cold_parse_class (SyxLexer *lexer)
{
SyxToken token = syx_lexer_get_last_token (lexer);
SyxOop superclass, subclass;
syx_string subclass_name;
syx_bool existing_class = TRUE;
SyxOop inst_vars, class_vars;
SyxLexer *inst_vars_lexer, *class_vars_lexer;
syx_varsize super_inst_vars_size;
syx_int32 i;
if (token.type != SYX_TOKEN_NAME_CONST)
{
syx_error ("Expected a name constant\n");
syx_token_free (token);
return FALSE;
}
if (!strcmp (token.value.string, "nil"))
superclass = syx_nil;
else
superclass = syx_globals_at (token.value.string);
token = syx_lexer_next_token (lexer);
if (!(token.type == SYX_TOKEN_NAME_COLON && !strcmp (token.value.string, "subclass:")))
{
syx_token_free (token);
syx_error ("Expected #subclass:\n");
return FALSE;
}
syx_token_free (token);
token = syx_lexer_next_token (lexer);
if (token.type != SYX_TOKEN_SYM_CONST)
{
syx_token_free (token);
syx_error ("Expected a symbol constant\n");
return FALSE;
}
subclass_name = syx_strdup (token.value.string);
syx_token_free (token);
subclass = syx_globals_at_if_absent (subclass_name, syx_nil);
if (strcmp (subclass_name, "Object"))
{
if (SYX_IS_NIL (subclass))
existing_class = FALSE;
else
{
existing_class = TRUE;
if (SYX_OOP_NE (SYX_CLASS_SUPERCLASS(subclass), superclass))
{
syx_array_remove (SYX_CLASS_SUBCLASSES (SYX_CLASS_SUPERCLASS (subclass)),
subclass);
SYX_CLASS_SUPERCLASS(subclass) = superclass;
syx_array_add (SYX_CLASS_SUBCLASSES (superclass), subclass, TRUE);
syx_array_remove (SYX_CLASS_SUBCLASSES (SYX_CLASS_SUPERCLASS(syx_object_get_class (subclass))),
syx_object_get_class (subclass));
SYX_CLASS_SUPERCLASS(syx_object_get_class (subclass)) = syx_object_get_class (superclass);
syx_array_add (SYX_CLASS_SUBCLASSES (syx_object_get_class (superclass)),
syx_object_get_class (subclass), TRUE);
}
}
}
token = syx_lexer_next_token (lexer);
if (token.type != SYX_TOKEN_NAME_COLON)
{
syx_token_free (token);
syx_error ("Expected #instanceVariableNames:\n");
return FALSE;
}
syx_token_free (token);
token = syx_lexer_next_token (lexer);
if (token.type != SYX_TOKEN_STR_CONST)
{
syx_token_free (token);
syx_error ("Expected a string as argument for #instanceVariableNames:\n");
return FALSE;
}
inst_vars_lexer = syx_lexer_new (token.value.string);
token = syx_lexer_next_token (lexer);
if (token.type != SYX_TOKEN_NAME_COLON)
{
syx_token_free (token);
syx_error ("Expected #classVariableNames:\n");
return FALSE;
}
syx_token_free (token);
token = syx_lexer_next_token (lexer);
if (token.type != SYX_TOKEN_STR_CONST)
{
syx_token_free (token);
syx_error ("Expected a string as argument for #classVariableNames:\n");
return FALSE;
}
class_vars_lexer = syx_lexer_new (token.value.string);
token = syx_lexer_next_token (lexer);
if (!_IS_EXL_MARK (token))
{
syx_token_free (token);
syx_error ("Class definition must terminate with an exlamation mark\n");
return FALSE;
}
syx_token_free (token);
if (!existing_class)
{
subclass = syx_class_new (superclass);
SYX_CLASS_NAME(subclass) = syx_symbol_new (subclass_name);
syx_globals_at_put (SYX_CLASS_NAME(subclass), subclass);
}
syx_free (subclass_name);
/* Parse instance variables */
inst_vars = _syx_cold_parse_vars (inst_vars_lexer, FALSE);
syx_lexer_free (inst_vars_lexer, TRUE);
/* Fetch superclass instanceSize */
if (SYX_IS_NIL (superclass))
super_inst_vars_size = 0;
else
super_inst_vars_size = SYX_SMALL_INTEGER (SYX_CLASS_INSTANCE_SIZE (superclass));
SYX_CLASS_INSTANCE_VARIABLES(subclass) = inst_vars;
SYX_CLASS_INSTANCE_SIZE(subclass) = syx_small_integer_new (super_inst_vars_size
+ SYX_OBJECT_DATA_SIZE (inst_vars));
/* Now parse class variables */
class_vars = _syx_cold_parse_vars (class_vars_lexer, TRUE);
syx_lexer_free (class_vars_lexer, TRUE);
SYX_CLASS_CLASS_VARIABLES(subclass) = syx_dictionary_new (SYX_OBJECT_DATA_SIZE (class_vars) + 10);
/* translate from array to dictionary */
for (i=0; i < SYX_OBJECT_DATA_SIZE(class_vars); i++)
syx_dictionary_at_symbol_put (SYX_CLASS_CLASS_VARIABLES(subclass),
SYX_OBJECT_DATA(class_vars)[i], syx_nil);
/* get rid of this */
syx_object_free (class_vars);
return TRUE;
}