/*
* Get a property from an intrinsic class modifier object. Look up the
* property in my own modifier, and recursively in my superclass modifiers.
*/
int CVmObjClass::get_prop_from_mod(VMG_ vm_prop_id_t prop, vm_val_t *val,
vm_obj_id_t self, vm_obj_id_t *source_obj,
uint *argc)
{
vm_obj_id_t sc;
vm_obj_id_t mod_obj;
/* if we have a modifier object, look it up in the modifier */
if ((mod_obj = get_mod_obj()) != VM_INVALID_OBJ
&& vm_objp(vmg_ mod_obj)->get_prop(vmg_ prop, val, mod_obj,
source_obj, argc))
{
/* got it - return it from the modifier */
return TRUE;
}
/*
* it's not in our modifier(s); check with any intrinsic superclass
* modifiers
*/
if (get_superclass_count(vmg_ self) != 0
&& (sc = get_superclass(vmg_ self, 0)) != VM_INVALID_OBJ)
{
/* we have a superclass - check it recursively */
return ((CVmObjClass *)vm_objp(vmg_ sc))
->get_prop_from_mod(vmg_ prop, val, sc, source_obj, argc);
}
/*
* we didn't find it, and we have no superclass, so there's nowhere
* else to look - return failure
*/
return FALSE;
}
/*
* Find the intrinsic class which the given modifier object modifies. This
* can only be used with a modifier that modifies me or one of my
* superclasses.
*/
vm_obj_id_t CVmObjClass::find_mod_src_obj(VMG_ vm_obj_id_t self,
vm_obj_id_t mod_obj)
{
vm_obj_id_t my_mod_obj;
vm_obj_id_t sc;
/*
* Is this one of my modifier objects? It is if it's my most
* specialized modifier object (i.e., get_mod_obj()), or if my most
* specialized modifier object descends from the given object.
*/
my_mod_obj = get_mod_obj();
if (my_mod_obj != VM_INVALID_OBJ
&& (mod_obj == my_mod_obj
|| vm_objp(vmg_ my_mod_obj)->is_instance_of(vmg_ mod_obj)))
{
/* it's one of mine, so I'm the intrinsic class mod_obj modifies */
return self;
}
/*
* It's not one of mine, so check my superclasses recursively. If we
* have no direct superclass, we've failed to find the object.
*/
if (get_superclass_count(vmg_ self) == 0
|| (sc = get_superclass(vmg_ self, 0)) == VM_INVALID_OBJ)
return VM_INVALID_OBJ;
/* ask the superclass to find the modifier */
return ((CVmObjClass *)vm_objp(vmg_ sc))
->find_mod_src_obj(vmg_ sc, mod_obj);
}
/*
* Global symbol enumeration callback - fix up this symbol's compiler
* metaclass identifier, if this is an object symbol.
*/
static void fix_obj_meta_cb(void *ctx0, CTcSymbol *sym)
{
/* cast our context and set up to access VM globals */
fix_obj_meta_cb_ctx *ctx = (fix_obj_meta_cb_ctx *)ctx0;
VMGLOB_PTR(ctx->vmg);
/* if this is an object symbol, fix up its metaclass identifier */
if (sym->get_type() == TC_SYM_OBJ)
{
CVmObject *obj;
CVmMetaclass *meta;
uint idx;
tc_metaclass_t id;
/* cast the symbol to an object symbol */
CTcSymObj *obj_sym = (CTcSymObj *)sym;
/* get the object */
obj = vm_objp(vmg_ (vm_obj_id_t)obj_sym->get_obj_id());
/* look up its metaclass */
meta = obj->get_metaclass_reg();
/* get the registration table index */
idx = meta->get_reg_idx();
/* that's our index into the translation table - look it up */
id = ctx->xlat[idx];
/* store the compiler metaclass ID back in the symbol */
obj_sym->set_metaclass(id);
}
}
/*
* create from stack arguments
*/
vm_obj_id_t CVmObjAnonFn::create_from_stack(VMG_ const uchar **pc_ptr,
uint argc)
{
vm_obj_id_t id;
vm_val_t funcptr;
CVmObjAnonFn *new_obj;
uint idx;
/* at least one argument is required (the function pointer) */
if (argc < 1)
err_throw(VMERR_WRONG_NUM_OF_ARGS);
/* retrieve our function pointer argument */
G_stk->pop(&funcptr);
if (funcptr.typ == VM_FUNCPTR)
{
/* it's a regular function pointer - accept it */
}
else if (funcptr.typ == VM_OBJ
&& vm_objp(vmg_ funcptr.val.obj)->get_invoker(vmg_ 0))
{
/* it's a pointer to an invokable object - accept it */
}
else
{
/* it's not a valid function pointer */
err_throw(VMERR_FUNCPTR_VAL_REQD);
}
/* create the new object */
id = vm_new_id(vmg_ FALSE, TRUE, FALSE);
/* create the new object, giving it one slot per constructor argument */
new_obj = new (vmg_ id) CVmObjAnonFn(vmg_ argc);
/* set the first element to our function pointer */
new_obj->set_element(0, &funcptr);
/* set the remaining elements to the context objects */
for (idx = 1 ; idx < argc ; ++idx)
{
vm_val_t val;
/* pop this value */
G_stk->pop(&val);
/* set the element */
new_obj->set_element(idx, &val);
}
/* return the new object ID */
return id;
}
/*
* Create an object with the given ID and load the object from the image
* file.
*/
void CVmMetaTable::create_from_image(VMG_ uint idx, vm_obj_id_t id,
const char *ptr, size_t siz)
{
/* make sure the entry is defined */
if (idx >= count_)
err_throw(VMERR_BAD_METACLASS_INDEX);
/* create the object table entry in the memory manager */
G_obj_table->alloc_obj_with_id(id, TRUE);
/* invoke the appropriate constructor */
table_[idx].meta_->create_for_image_load(vmg_ id);
/* load the object */
vm_objp(vmg_ id)->load_from_image(vmg_ id, ptr, siz);
}
/*
* Invoke
*/
int CVmObjAnonFn::get_invoker(VMG_ vm_val_t *val)
{
/* our first vector element is our function pointer */
if (val != 0)
{
/* get the function pointer */
get_element(0, val);
/* if this is itself an invokable value, get its invoker */
if (val->typ == VM_OBJ)
return vm_objp(vmg_ val->val.obj)->get_invoker(vmg_ val);
}
/* we are indeed invokable */
return TRUE;
}
/*
* Set the value of a local given the variable descriptor
*/
void CVmObjFrameRef::set_local_val(VMG_ const CVmDbgFrameSymPtr *sym,
const vm_val_t *new_val)
{
/*
* if we have an active stack frame, get the value from the frame;
* otherwise get the value from our local snapshot
*/
vm_frameref_ext *ext = get_ext();
if (ext->fp != 0)
{
/* we have a frame - get the value from the frame */
G_interpreter->set_local_in_frame(vmg_ new_val, ext->fp, sym);
}
else
{
/*
* There's no frame, so we must retrieve the value from the
* snapshot. First, get the value of the local or parameter. Our
* snapshot array consists of all of the locals followed by all of
* the parameters, so local N is at vars[N] and parameter N is at
* vars[nlocals + N].
*/
vm_val_t *v = &ext->vars[sym->get_var_num()
+ (sym->is_param() ? ext->nlocals : 0)];
/*
* If it's a context local, index the local by the context index.
* Otherwise the value is simply the value in the snapshot array.
*/
if (sym->is_ctx_local())
{
vm_val_t cont;
vm_val_t ival;
ival.set_int(sym->get_ctx_arr_idx());
if (v->typ == VM_OBJ)
vm_objp(vmg_ v->val.obj)->set_index_val_ov(
vmg_ &cont, v->val.obj, &ival, new_val);
else
err_throw(VMERR_CANNOT_INDEX_TYPE);
}
else
*v = *new_val;
}
}
/* set a property */
void CVmObjClass::set_prop(VMG_ CVmUndo *undo,
vm_obj_id_t self, vm_prop_id_t prop,
const vm_val_t *val)
{
/* try treating the request as a static property of the metaclass */
vm_meta_entry_t *entry = get_meta_entry(vmg0_);
if (entry != 0
&& entry->meta_->set_stat_prop(
vmg_ undo, self, &get_ext()->class_state, prop, val))
return;
/* the class doesn't handle it, so check for a modifier object */
vm_obj_id_t mod_obj = get_mod_obj();
if (mod_obj != VM_INVALID_OBJ)
{
/* we have a modifier - set the property in the modifier */
vm_objp(vmg_ mod_obj)->set_prop(vmg_ undo, mod_obj, prop, val);
}
else
{
/* if we don't have a modifier, we can't set the property */
err_throw(VMERR_INVALID_SETPROP);
}
}
/*
* Initialize from a vm_val_t
*/
int CVmFuncPtr::set(VMG_ const vm_val_t *val)
{
vm_val_t invoker;
/* we might need to re-resolve from an invoker, so loop until resolved */
for (;;)
{
/* check the type */
switch (val->typ)
{
case VM_OBJ:
case VM_OBJX:
/* object - check to see if it's invokable */
if (vm_objp(vmg_ val->val.obj)->get_invoker(vmg_ &invoker))
{
/* it's invokable - re-resolve using the invoker */
val = &invoker;
}
else
{
/* other object types are not function pointers */
set((uchar *)0);
return FALSE;
}
break;
case VM_FUNCPTR:
case VM_CODEOFS:
/* function pointer - get the address from the code pool */
set((const uchar *)G_code_pool->get_ptr(val->val.ofs));
return TRUE;
case VM_CODEPTR:
/* direct code pointer - the value contains the address */
set((const uchar *)val->val.ptr);
return TRUE;
case VM_BIFPTR:
case VM_BIFPTRX:
/* built-in function pointer */
{
/*
* decode the function set information from the value, and
* look up the bif descriptor in the registration table
*/
const vm_bif_desc *desc = G_bif_table->get_desc(
val->val.bifptr.set_idx, val->val.bifptr.func_idx);
/* fail if there's no descriptor */
if (desc == 0)
return FALSE;
/* point to the synthetic header */
set((const uchar *)desc->synth_hdr);
}
return TRUE;
default:
/* other types are invalid */
set((uchar *)0);
return FALSE;
}
}
}
/*
* Get the local variable table for a given stack level. We'll fill in
* 'retval' with a LooupTable object containing the local values keyed by
* symbol name, or nil if we can't find the locals. We'll also push the
* object onto the stack for gc protection, so the caller must pop it when
* done with it.
*/
void CVmBifT3::get_stack_locals(VMG_ vm_val_t *fp,
const uchar *entry_addr, ulong method_ofs,
vm_val_t *local_tab, vm_val_t *frameref_obj)
{
/* presume we won't be able to find source information for the location */
if (local_tab != 0)
local_tab->set_nil();
if (frameref_obj != 0)
frameref_obj->set_nil();
/* we haven't found any relevant frames yet */
int best = 0;
/* set up a debug table pointer for the function or method */
CVmDbgTablePtr dp;
if (dp.set(entry_addr))
{
/* search for the innermost frame containing the method offset */
int frame_cnt = dp.get_frame_count(vmg0_);
for (int i = 1 ; i <= frame_cnt ; ++i)
{
/* get this frame */
CVmDbgFramePtr fp;
dp.set_frame_ptr(vmg_ &fp, i);
/* check to see if this contains method_ofs */
uint start_ofs = fp.get_start_ofs(vmg0_);
uint end_ofs = fp.get_end_ofs(vmg0_);
if (method_ofs >= start_ofs && method_ofs <= end_ofs)
{
/*
* This is a relevant frame. If we don't have any frames
* yet, or this one is nested within the best we've found
* so far, this is the best frame so far.
*/
if (best == 0 || fp.is_nested_in(vmg_ &dp, best))
best = i;
}
}
}
/* get the frame-reference, if the caller wants one */
if (frameref_obj != 0)
{
/* get the slot */
vm_val_t *fro = G_interpreter->get_frameref_slot(vmg_ fp);
/* if there's not already a StackFrameRef object there, create one */
if (fro->typ == VM_NIL)
{
/* create the StackFrameRef and store it in the stack slot */
fro->set_obj(CVmObjFrameRef::create(vmg_ fp, entry_addr));
}
/* create the StackFrameDesc to return to the caller */
frameref_obj->set_obj(CVmObjFrameDesc::create(
vmg_ fro->val.obj, best, method_ofs));
/* push it for gc protection */
G_stk->push(frameref_obj);
}
/* if they didn't want the local variable table, we're done */
if (local_tab == 0)
return;
/* create a lookup table for the locals */
local_tab->set_obj(CVmObjLookupTable::create(vmg_ FALSE, 32, 64));
CVmObjLookupTable *t =
(CVmObjLookupTable *)vm_objp(vmg_ local_tab->val.obj);
/* save it on the stack for gc protection */
G_stk->push(local_tab);
/* if we didn't find a best frame, there are no locals to retrieve */
if (best == 0)
return;
/* set up a pointer to our winning frame */
CVmDbgFramePtr dfp;
dp.set_frame_ptr(vmg_ &dfp, best);
/* walk up the list of frames from the innermost to outermost */
for (;;)
{
/* set up a pointer to the first symbol */
CVmDbgFrameSymPtr symp;
dfp.set_first_sym_ptr(vmg_ &symp);
/* scan this frame's local symbol list */
int sym_cnt = dfp.get_sym_count();
for (int i = 0 ; i < sym_cnt ; ++i, symp.inc(vmg0_))
{
vm_val_t name, val;
/* get the symbol name */
symp.get_str_val(vmg_ &name);
/*
* if this symbol is already in the table, skip it - we work
* from inner to outer frames, and inner frames hide symbols in
* outer frames
*/
if (t->index_check(vmg_ &val, &name))
continue;
/* get the value from the frame */
G_interpreter->get_local_from_frame(vmg_ &val, fp, &symp);
/* add this to the lookup table */
t->add_entry(vmg_ &name, &val);
}
/* get the enclosing frame - 0 means no parent */
int parent = dfp.get_enclosing_frame();
if (parent == 0)
break;
/* set up dfp to point to the parent frame */
dp.set_frame_ptr(vmg_ &dfp, parent);
}
}
/*
* Get the source file information for a given code pool offset. If debug
* records aren't available for the given location, returns nil. Returns
* a list containing the source file information: the first element is a
* string giving the name of the file, and the second element is an
* integer giving the line number in the file. Returns nil if no source
* information is available for the given byte code location.
*/
void CVmBifT3::get_source_info(VMG_ const uchar *entry_addr, ulong method_ofs,
vm_val_t *retval)
{
CVmFuncPtr func_ptr;
CVmDbgLinePtr line_ptr;
const uchar *stm_start, *stm_end;
CVmObjList *lst;
vm_val_t ele;
CVmSrcfEntry *srcf;
CVmObjString *str;
const char *fname;
size_t map_len;
/* presume we won't be able to find source information for the location */
retval->set_nil();
/* set up a debug table pointer for the function or method */
func_ptr.set(entry_addr);
/* get the debug information for the given location */
if (!CVmRun::get_stm_bounds(vmg_ &func_ptr, method_ofs,
&line_ptr, &stm_start, &stm_end))
{
/* no source information available - return failure */
return;
}
/* get the source file record - if we can't find it, return failure */
srcf = (G_srcf_table != 0
? G_srcf_table->get_entry(line_ptr.get_source_id()) : 0);
if (srcf == 0)
return;
/*
* Create a list for the return value. The return list has two
* elements: the name of the source file containing this code, and the
* line number in the file.
*/
retval->set_obj(CVmObjList::create(vmg_ FALSE, 2));
lst = (CVmObjList *)vm_objp(vmg_ retval->val.obj);
/* clear the list, in case gc runs during construction */
lst->cons_clear();
/* push the list for gc protection */
G_stk->push(retval);
/* get the filename string */
fname = srcf->get_name();
/*
* determine how long the string will be when translated to utf8 from
* the local filename character set
*/
map_len = G_cmap_from_fname->map_str(0, 0, fname);
/*
* create a string value to hold the filename, and store it in the
* first element of the return list (note that this automatically
* protects the new string from garbage collection, by virtue of the
* list referencing the string and the list itself being protected)
*/
ele.set_obj(CVmObjString::create(vmg_ FALSE, map_len));
lst->cons_set_element(0, &ele);
/* map the string into the buffer we allocated for it */
str = (CVmObjString *)vm_objp(vmg_ ele.val.obj);
G_cmap_from_fname->map_str(str->cons_get_buf(), map_len, fname);
/* set the second element of the list to the source line number */
ele.set_int(line_ptr.get_source_line());
lst->cons_set_element(1, &ele);
/* discard our gc protection */
G_stk->discard();
}
/*
* Retrieve a list of the named argument names.
*/
void CVmBifT3::get_named_arg_list(VMG_ uint argc)
{
/* check arguments */
check_argc(vmg_ argc, 0);
/* create the result list; we'll expand as necessary later */
G_stk->push()->set_obj(CVmObjList::create(vmg_ FALSE, 10));
CVmObjList *lst = (CVmObjList *)vm_objp(vmg_ G_stk->get(0)->val.obj);
/* clear it out, since we're building it incrementally */
lst->cons_clear();
/* we haven't added any elements yet */
int idx = 0;
/* scan the stack and populate the name list from the tables we find */
for (vm_val_t *fp = G_interpreter->get_frame_ptr() ; fp != 0 ;
fp = G_interpreter->get_enclosing_frame_ptr(vmg_ fp))
{
/* look for a named argument table in this frame */
vm_val_t *argp;
const uchar *t = CVmRun::get_named_args_from_frame(vmg_ fp, &argp);
if (t != 0)
{
/* get the number of table entries */
int n = osrp2(t);
t += 2;
/*
* Build the list. The compiler generates the list in
* right-to-left order (the order of pushing the arguments).
* For readability, reverse this: generate the list left to
* right, so that it appears in the original source code order.
*/
argp += n - 1;
for (int i = (n-1)*2 ; i >= 0 ; i -= 2, --argp)
{
/* get this string's offset and figure its length */
uint ofs = osrp2(t + i);
uint len = osrp2(t + i + 2) - ofs;
/* create a string from the name */
vm_val_t str;
str.set_obj(CVmObjString::create(
vmg_ FALSE, (const char *)t + ofs, len));
/* add it to the list */
lst->cons_ensure_space(vmg_ idx, 10);
lst->cons_set_element(idx, &str);
++idx;
}
}
}
/* set the final list length */
lst->cons_set_len(idx);
/* keep only the unique elements */
lst->cons_uniquify(vmg0_);
/* return the results */
retval_pop(vmg0_);
}
void CVmBifT3::get_stack_trace(VMG_ uint argc)
{
int single_level = 0;
int level;
vm_val_t *fp;
vm_val_t lst_val;
CVmObjList *lst;
const uchar *entry_addr;
ulong method_ofs;
vm_val_t stack_info_cls;
int want_named_args = FALSE;
int want_locals = FALSE;
int want_frefs = FALSE;
int flags = 0;
const vm_rcdesc *rc;
/* check arguments */
check_argc_range(vmg_ argc, 0, 2);
/* get the imported stack information class */
stack_info_cls.set_obj(G_predef->stack_info_cls);
if (stack_info_cls.val.obj == VM_INVALID_OBJ)
{
/*
* there's no stack information class - we can't return any
* meaningful information, so just return nil
*/
retval_nil(vmg0_);
return;
}
/*
* look up T3StackInfo.construct() to determine how many arguments it
* wants
*/
{
int min_args, opt_args, varargs;
if (vm_objp(vmg_ stack_info_cls.val.obj)->get_prop_interface(
vmg_ stack_info_cls.val.obj, G_predef->obj_construct,
min_args, opt_args, varargs))
{
/* check to see how many extra arguments they want */
want_named_args = (min_args + opt_args >= 7 || varargs);
want_locals = (min_args + opt_args >= 8 || varargs);
want_frefs = (min_args + opt_args >= 9 || varargs);
}
}
/* check to see if we're fetching a single level or the full trace */
if (argc >= 1)
{
/*
* Get the single level, and adjust to a 0 base. If the level is
* nil, we're still getting all levels.
*/
if (G_stk->get(0)->typ == VM_NIL)
{
/* it's nil - get all levels */
G_stk->discard();
}
else
{
/* get the level number */
single_level = pop_int_val(vmg0_);
/* make sure it's in range */
if (single_level <= 0)
err_throw(VMERR_BAD_VAL_BIF);
/* we won't need a return list */
lst_val.set_obj_or_nil(VM_INVALID_OBJ);
lst = 0;
}
}
/* get the flags argument, if present */
if (argc >= 2)
flags = pop_int_val(vmg0_);
/* if we're not doing a single level, we need a list for the result */
if (!single_level)
{
/*
* We're returning a full list, so we need to allocate the list for
* the return value. First, count stack levels to see how big a
* list we'll need.
*/
fp = G_interpreter->get_frame_ptr();
entry_addr = G_interpreter->get_entry_ptr();
method_ofs = G_interpreter->get_method_ofs();
for (level = 0 ; fp != 0 ;
fp = G_interpreter->get_enclosing_frame_ptr(vmg_ fp), ++level)
{
/* add an extra level for each system call */
if (method_ofs == 0 && entry_addr != 0)
++level;
/* get the return address */
entry_addr =
G_interpreter->get_enclosing_entry_ptr_from_frame(vmg_ fp);
method_ofs = G_interpreter->get_return_ofs_from_frame(vmg_ fp);
}
/* create the list */
lst_val.set_obj(CVmObjList::create(vmg_ FALSE, level));
lst = (CVmObjList *)vm_objp(vmg_ lst_val.val.obj);
/*
* we create other objects while building this list, so the gc
* could run - clear the list to ensure it contains valid data
*/
lst->cons_clear();
/* protect the list from garbage collection while we work */
G_stk->push(&lst_val);
/* flag that we're doing the whole stack */
single_level = -1;
}
else
{
/* adjust the level to a 0-based index */
single_level -= 1;
}
/* set up at the current function */
fp = G_interpreter->get_frame_ptr();
entry_addr = G_interpreter->get_entry_ptr();
method_ofs = G_interpreter->get_method_ofs();
rc = 0;
/* traverse the frames */
for (level = 0 ; fp != 0 ; ++level)
{
int fr_argc;
int i;
vm_obj_id_t def_obj;
vm_val_t info_self;
vm_val_t info_func;
vm_val_t info_obj;
vm_val_t info_prop;
vm_val_t info_args;
vm_val_t info_locals;
vm_val_t info_srcloc;
vm_val_t info_frameref;
CVmObjList *arglst;
vm_val_t ele;
CVmFuncPtr func_ptr;
int gc_cnt = 0;
int info_argc = 0;
/* if we're looking for a single level, and this isn't it, skip it */
if (single_level >= 0 && level != single_level)
goto done_with_level;
/*
* start with the information values to nil - we'll set the
* appropriate ones when we find out what we have
*/
info_func.set_nil();
info_obj.set_nil();
info_prop.set_nil();
info_self.set_nil();
info_locals.set_nil();
info_frameref.set_nil();
/* get the number of arguments to the function in this frame */
fr_argc = G_interpreter->get_argc_from_frame(vmg_ fp);
/* set up a function pointer for the method's entry address */
func_ptr.set(entry_addr);
/* get the current frame's defining object */
def_obj = G_interpreter->get_defining_obj_from_frame(vmg_ fp);
/* check for special method offsets */
switch (method_ofs)
{
case VMRUN_RET_OP:
/* the real return address is one past the last argument */
method_ofs = G_interpreter->get_param_from_frame(vmg_ fp, argc)
->val.intval;
break;
case VMRUN_RET_OP_ASILCL:
/* the real return address is two past the last argument */
method_ofs = G_interpreter->get_param_from_frame(vmg_ fp, argc+1)
->val.intval;
break;
}
/* determine whether it's an object.prop or a function call */
if (method_ofs == 0)
{
/*
* A zero method offset indicates a recursive VM invocation
* from a native function. Presume we have no information on
* the caller.
*/
info_self.set_nil();
fr_argc = 0;
/* check for a native caller context */
if (rc != 0)
{
/* check which kind of native caller we have */
if (rc->bifptr.typ != VM_NIL)
{
/* we have a built-in function at this level */
info_func = rc->bifptr;
}
else if (rc->self.typ != VM_NIL)
{
/* it's an intrinsic class method - get the 'self' */
info_obj = info_self = rc->self;
/* get the metaclass */
CVmMetaclass *mc;
switch (info_obj.typ)
{
case VM_OBJ:
/* get the metaclass from the object */
mc = vm_objp(vmg_ info_obj.val.obj)
->get_metaclass_reg();
break;
case VM_LIST:
/* list constant - use the List metaclass */
mc = CVmObjList::metaclass_reg_;
break;
case VM_SSTRING:
/* string constant - use the String metaclass */
mc = CVmObjString::metaclass_reg_;
break;
default:
/* other types don't have metaclasses */
mc = 0;
break;
}
/* get the registration table entry */
vm_meta_entry_t *me =
mc == 0 ? 0 :
G_meta_table->get_entry_from_reg(mc->get_reg_idx());
/* get the metaclass and property from the entry */
if (me != 0)
{
/* set 'obj' to the IntrinsicClass object */
info_obj.set_obj(me->class_obj_);
/* get the property ID */
info_prop.set_propid(me->xlat_func(rc->method_idx));
}
}
}
}
else if (def_obj == VM_INVALID_OBJ)
{
/* there's no defining object, so this is a function call */
func_ptr.get_fnptr(vmg_ &info_func);
}
else
{
/* it's an object.prop invocation */
info_obj.set_obj(def_obj); // $$$ walk up to base modified obj?
info_prop.set_propid(
G_interpreter->get_target_prop_from_frame(vmg_ fp));
/* get the 'self' in this frame */
info_self.set_obj(G_interpreter->get_self_from_frame(vmg_ fp));
}
/*
* build the argument list and source location, except for system
* routines
*/
if (method_ofs != 0 || rc != 0)
{
/* allocate a list object to store the argument list */
int ac = (rc != 0 ? rc->argc : fr_argc);
info_args.set_obj(CVmObjList::create(vmg_ FALSE, ac));
arglst = (CVmObjList *)vm_objp(vmg_ info_args.val.obj);
/* push the argument list for gc protection */
G_stk->push(&info_args);
++gc_cnt;
/* build the argument list */
for (i = 0 ; i < ac ; ++i)
{
/* add this element to the argument list */
const vm_val_t *v =
(rc != 0
? rc->argp - i
: G_interpreter->get_param_from_frame(vmg_ fp, i));
arglst->cons_set_element(i, v);
}
/* get the source location */
get_source_info(vmg_ entry_addr, method_ofs, &info_srcloc);
/*
* if they want locals, and this isn't a recursive native
* caller, retrieve them
*/
if (rc == 0
&& (((flags & T3_GST_LOCALS) != 0 && want_locals)
|| ((flags & T3_GST_FREFS) != 0 && want_frefs)))
{
/* get the locals */
get_stack_locals(vmg_ fp, entry_addr, method_ofs,
(flags & T3_GST_LOCALS) != 0 && want_locals
? &info_locals : 0,
(flags & T3_GST_FREFS) != 0 && want_frefs
? &info_frameref : 0);
/*
* that leaves the LookupTable and StackFrameDesc on the
* stack, so note that we need to discard the stack level
* when we're done with it
*/
if (info_locals.typ == VM_OBJ)
++gc_cnt;
if (info_frameref.typ == VM_OBJ)
++gc_cnt;
}
}
else
{
/*
* it's a system routine - no argument information is
* available, so return nil rather than an empty list to to
* indicate the absence
*/
info_args.set_nil();
/* there's obviously no source location for system code */
info_srcloc.set_nil();
}
/*
* We have all of the information on this level now, so create the
* information object for the level. This is an object of the
* exported stack-info class, which is a TadsObject type.
*/
/* start with the original complement of arguments */
info_argc = 7;
/*
* if we have a modern T3StackInfo object, push the locals,
* named argument elements, and frame reference object
*/
if (want_frefs)
{
G_stk->push(&info_frameref);
++info_argc;
}
if (want_named_args)
{
/*
* the constructor has a slot for named arguments - push either
* a table or nil, depending...
*/
vm_val_t *argp;
const uchar *t = 0;
/* if the flags request locals, retrieve the named arguments */
if ((flags & T3_GST_LOCALS) != 0)
t = CVmRun::get_named_args_from_frame(vmg_ fp, &argp);
/*
* if we do in fact have named arguments, build a lookup table
* copy and push it; otherwise just push nil
*/
if (t != 0)
{
/* get the number of table entries */
int n = osrp2(t);
t += 2;
/* create a lookup table for the arguments */
G_stk->push()->set_obj(CVmObjLookupTable::create(
vmg_ FALSE, n <= 8 ? 8 : n <= 32 ? 32 : 64, n));
CVmObjLookupTable *lt = (CVmObjLookupTable *)vm_objp(
vmg_ G_stk->get(0)->val.obj);
/*
* Populate the lookup table with the named arguments. The
* compiler builds the table in the order pushed, which is
* right to left. Lookup tables preserve the order in
* which elements are added, and reflect this order in key
* lists, so to that extent the order of building the
* lookup table matters. For readability of the generated
* list, in case it's presented to the user, build the
* table in left-to-right order, which is the reverse of
* the table order in the bytecode table.
*/
argp += n - 1;
for (int i = (n-1)*2 ; i >= 0 ; i -= 2, --argp)
{
/* get the name pointer and length from the index */
uint ofs = osrp2(t + i), nxtofs = osrp2(t + i + 2);
const char *name = (const char *)t + ofs;
size_t len = nxtofs - ofs;
/* create a string from the name */
vm_val_t str;
str.set_obj(CVmObjString::create(vmg_ FALSE, name, len));
/* add it to the table */
lt->add_entry(vmg_ &str, argp);
}
}
else
{
/* there are no named arguments - push nil */
G_stk->push()->set_nil();
}
/* count the argument */
++info_argc;
}
if (want_locals)
{
G_stk->push(&info_locals);
++info_argc;
}
/* push the rest of the arguments */
G_stk->push(&info_srcloc);
G_stk->push(&info_args);
G_stk->push(&info_self);
G_stk->push(&info_prop);
G_stk->push(&info_obj);
G_stk->push(&info_func);
G_stk->push(&stack_info_cls);
ele.set_obj(CVmObjTads::create_from_stack(vmg_ 0, info_argc));
/* discard the gc protection items */
G_stk->discard(gc_cnt);
/*
* if we're fetching a single level, this is it - return the new
* stack info object and we're done
*/
if (single_level >= 0)
{
/* return the single level object */
retval_obj(vmg_ ele.val.obj);
/* we're done */
return;
}
/* add the new element to our list */
lst->cons_set_element(level, &ele);
done_with_level:
/*
* If this is a system call level, and we're not in debug mode,
* this recursive frame contains the entry address for the caller,
* but not the calling byte-code address. Stay on the current
* level in this case.
*/
if (method_ofs == 0 && entry_addr != 0)
{
/*
* This is a recursive caller, and we have a valid entry
* address for the prior frame. Stay in the current frame, and
* retrieve the actual return address from the calling frame.
*/
if (rc != 0)
{
/* get the actual return address from the recursive context */
method_ofs = rc->return_addr - entry_addr;
/*
* we're now in the bytecode part of the frame, so forget
* the recursive context
*/
rc = 0;
}
else
{
/* no recursive context - use a fake return address */
method_ofs = G_interpreter->get_funchdr_size();
}
}
else
{
/* move up to the enclosing frame */
entry_addr =
G_interpreter->get_enclosing_entry_ptr_from_frame(vmg_ fp);
method_ofs = G_interpreter->get_return_ofs_from_frame(vmg_ fp);
rc = G_interpreter->get_rcdesc_from_frame(vmg_ fp);
fp = G_interpreter->get_enclosing_frame_ptr(vmg_ fp);
}
}
/* return the list */
retval_obj(vmg_ lst_val.val.obj);
/* discard our gc protection */
G_stk->discard();
}
int main(int argc, char **argv)
{
CImageFile *imagefp;
vm_val_t val;
vm_val_t *stkval;
vm_globals *vmg__;
CVmHostIfc *hostifc;
CVmMainClientConsole clientifc;
/* initialize for testing */
test_init();
/* initialize the VM */
hostifc = new CVmHostIfcStdio(argv[0]);
vm_initialize(&vmg__, &vm_init_options(hostifc, &clientifc,
"us-ascii", "us_ascii"));
/* create a fake host file object */
imagefp = new CImageFile();
/* create the constant pool */
G_const_pool->attach_backing_store(imagefp);
/* create a couple of objects and push them on the stack */
val.set_obj(CVmObjTads::create(vmg_ FALSE, 0, 4));
G_stk->push(&val);
val.set_obj(CVmObjTads::create(vmg_ FALSE, 0, 4));
G_stk->push(&val);
/*
* create another object, and store it in a property of the first
* object
*/
val.set_obj(CVmObjTads::create(vmg_ FALSE, 0, 4));
stkval = G_stk->get(1);
vm_objp(vmg_ stkval->val.obj)->
set_prop(vmg_ G_undo, stkval->val.obj, PROP_A, &val);
/* collect garbage - nothing should be deleted at this point */
G_obj_table->gc_full(vmg0_);
/*
* forget about the second object by popping it off the stack, then
* collect garbage again -- the second object should be deleted at
* this point, because it's no longer reachable
*/
G_stk->discard();
G_obj_table->gc_full(vmg0_);
/*
* Force the first object's property table to expand by filling up
* its initial table
*/
stkval = G_stk->get(0);
val.set_nil();
vm_objp(vmg_ stkval->val.obj)->
set_prop(vmg_ G_undo, stkval->val.obj, PROP_A, &val);
vm_objp(vmg_ stkval->val.obj)->
set_prop(vmg_ G_undo, stkval->val.obj, PROP_B, &val);
vm_objp(vmg_ stkval->val.obj)->
set_prop(vmg_ G_undo, stkval->val.obj, PROP_C, &val);
vm_objp(vmg_ stkval->val.obj)->
set_prop(vmg_ G_undo, stkval->val.obj, PROP_D, &val);
vm_objp(vmg_ stkval->val.obj)->
set_prop(vmg_ G_undo, stkval->val.obj, PROP_E, &val);
/* set an existing property */
vm_objp(vmg_ stkval->val.obj)->
set_prop(vmg_ G_undo, stkval->val.obj, PROP_B, &val);
/* we're done, so delete all of our managers */
G_const_pool->detach_backing_store();
delete imagefp;
/* shut down the VM */
vm_terminate(vmg__, &clientifc);
/* delete the host interface */
delete hostifc;
/* terminate */
return 0;
}
/*
* Open a network file
*/
CVmNetFile *CVmNetFile::open(VMG_ const vm_val_t *val, const vm_rcdesc *rc,
int mode, os_filetype_t typ,
const char *mime_type)
{
vm_val_t filespec;
/* check for a TadsObject implementing getFilename */
if (G_predef->filespec_getFilename != VM_INVALID_PROP
&& val->typ == VM_OBJ
&& CVmObjTads::is_tadsobj_obj(vmg_ val->val.obj))
{
/* call getFilename - the return value is the file spec */
G_interpreter->get_prop(
vmg_ 0, val, G_predef->filespec_getFilename, val, 0, rc);
/* the result is the real file spec */
filespec = *G_interpreter->get_r0();
}
else
{
/* it's not a TadsObject, so it must directly have the file name */
filespec = *val;
}
/* check the argument type */
CVmNetFile *nf = 0;
if (filespec.typ == VM_OBJ
&& CVmObjTemporaryFile::is_tmpfil_obj(vmg_ filespec.val.obj))
{
/* temporary file object - get the object, properly cast */
CVmObjTemporaryFile *tmp = (CVmObjTemporaryFile *)vm_objp(
vmg_ filespec.val.obj);
/* if the temporary file object is invalid, it's an error */
if (tmp->get_fname() == 0)
err_throw(VMERR_CREATE_FILE);
/* create the local file descriptor for the temp file path */
nf = open_local(vmg_ tmp->get_fname(), 0, mode, typ);
/* mark it as a temp file */
nf->is_temp = TRUE;
}
else
{
/* anything else has to be a string */
char fname[OSFNMAX];
CVmBif::get_str_val_fname(vmg_ fname, sizeof(fname),
CVmBif::get_str_val(vmg_ &filespec));
/*
* if it's a local file, and it has a relative path, explicitly
* apply the image file path as the default working directory
*/
if (!os_is_file_absolute(fname) && !is_net_mode(vmg0_))
{
/* build the full, absolute name based on the image file path */
char fname_abs[OSFNMAX];
os_build_full_path(fname_abs, sizeof(fname_abs),
G_image_loader->get_path(), fname);
/* replace the relative path with the new absolute path */
lib_strcpy(fname, sizeof(fname), fname_abs);
}
/* create the regular network file descriptor */
nf = open(vmg_ fname, 0, mode, typ, mime_type);
}
/* if they gave us an object as our file spec, remember it */
if (nf != 0 && val->typ == VM_OBJ)
nf->filespec = val->val.obj;
/* return the network file descriptor */
return nf;
}
/*
* property evaluator - get a lookup table of the local variables, with
* their current values, keyed by name
*/
int CVmObjFrameDesc::getp_get_vars(VMG_ vm_obj_id_t self, vm_val_t *retval,
uint *argc)
{
/* check arguments */
static CVmNativeCodeDesc desc(0);
if (get_prop_check_argc(retval, argc, &desc))
return TRUE;
/* create our lookup table object */
retval->set_obj(CVmObjLookupTable::create(vmg_ FALSE, 32, 64));
CVmObjLookupTable *tab = (CVmObjLookupTable *)
vm_objp(vmg_ retval->val.obj);
/* get our extension */
vm_framedesc_ext *ext = get_ext();
/* get our underlying frame ref and its extension */
CVmObjFrameRef *fr = get_frame_ref(vmg0_);
vm_frameref_ext *fext = fr->get_ext();
/* set up pointer to this method's debug records */
CVmDbgTablePtr dp;
if (!dp.set(fext->entryp))
return TRUE;
/* set up a pointer to our frame */
CVmDbgFramePtr dfp;
dp.set_frame_ptr(vmg_ &dfp, ext->frame_idx);
/* push the table for gc protection */
G_stk->push(retval);
/* walk up the list of frames from innermost to outermost */
for (;;)
{
/* set up a pointer to the first symbol */
CVmDbgFrameSymPtr sym;
dfp.set_first_sym_ptr(vmg_ &sym);
/* scan this frame's local symbol list */
int sym_cnt = dfp.get_sym_count();
for (int i = 0 ; i < sym_cnt ; ++i, sym.inc(vmg0_))
{
/* set up a string value for the key */
vm_val_t key;
sym.get_str_val(vmg_ &key);
G_stk->push(&key);
/*
* If this entry isn't already in the table, add it. Don't
* bother if it already exists: we work from inner to outer
* scopes, and inner scopes hide things in outer scopes, so if
* we find an entry in the table already it means that it was
* an inner-scope entry that hides the one we're processing
* now.
*/
vm_val_t val;
if (!tab->index_check(vmg_ &val, &key))
{
/* get the value */
fr->get_local_val(vmg_ &val, &sym);
/* add the entry to the table */
tab->add_entry(vmg_ &key, &val);
}
/* done with the key for gc protection */
G_stk->discard();
}
/* move up to the enclosing frame */
int parent = dfp.get_enclosing_frame();
if (parent == 0)
break;
/* set up dfp to point to the parent fraem */
dp.set_frame_ptr(vmg_ &dfp, parent);
}
/* discard the table ref we pushed for gc protection */
G_stk->discard();
/* handled */
return TRUE;
}
/*
* Show a popup menu
*/
void CVmBifTIOExt::show_popup_menu(VMG_ uint argc)
{
int x, y, default_pos;
char *txt;
os_event_info_t evt;
int ret;
int elecnt;
vm_obj_id_t lst_obj;
CVmObjList *lst;
vm_val_t val;
/* check arguments */
check_argc(vmg_ argc, 3);
/* get the x,y coordinates */
if (G_stk->get(0)->typ == VM_NIL)
{
/* nil x,y - use default position */
default_pos = TRUE;
x = y = 0;
/* discard the nil x,y values */
G_stk->discard(2);
}
else
{
/* pop the x,y positions */
x = pop_int_val(vmg0_);
y = pop_int_val(vmg0_);
}
/* get the HTML text for the contents of the window */
txt = pop_str_val_ui(vmg_ 0, 0);
/* flush the console display output */
G_console->flush_all(vmg_ VM_NL_NONE);
/* show the window */
ret = os_show_popup_menu(default_pos, x, y, txt, strlen(txt), &evt);
/* free the HTML text buffer we allocated */
t3free(txt);
/* see what we have */
switch (ret)
{
case OSPOP_FAIL:
case OSPOP_CANCEL:
case OSPOP_EOF:
default:
elecnt = 1;
break;
case OSPOP_HREF:
elecnt = 2;
break;
}
/* allocate the return list */
lst_obj = CVmObjList::create(vmg_ FALSE, elecnt);
lst = (CVmObjList *)vm_objp(vmg_ lst_obj);
lst->cons_clear();
/* protect the list from garbage collection */
val.set_obj(lst_obj);
G_stk->push(&val);
/* set the first element to the main return code */
val.set_int(ret);
lst->cons_set_element(0, &val);
/* set additional elements according to the return code */
switch (ret)
{
case OSPOP_HREF:
/* add the HREF element */
val.set_obj(str_from_ui_str(vmg_ evt.href));
lst->cons_set_element(1, &val);
break;
default:
/* there aren't any other elements for other return codes */
break;
}
/* return the list */
retval_obj(vmg_ lst_obj);
/* discard the GC protection */
G_stk->discard();
}
/*
* Get a list of our properties
*/
void CVmObjClass::build_prop_list(VMG_ vm_obj_id_t self, vm_val_t *retval)
{
vm_obj_id_t mod_obj;
vm_meta_entry_t *entry;
size_t my_prop_cnt;
size_t mod_prop_cnt;
vm_val_t mod_val;
CVmObjList *lst;
CVmObjList *mod_lst;
/* presume we won't find any static properties of our own */
my_prop_cnt = 0;
/* get my metaclass table entry */
entry = get_meta_entry(vmg0_);
/* if we have an entry, count the properties */
if (entry != 0)
my_prop_cnt = list_class_props(vmg_ self, entry, 0, 0, FALSE);
/* if we have a modifier object, get its property list */
if ((mod_obj = get_mod_obj()) != VM_INVALID_OBJ)
{
/* get the modifier's property list - we'll add it to our own */
vm_objp(vmg_ mod_obj)->build_prop_list(vmg_ self, &mod_val);
/* get the result as a list object, properly cast */
mod_lst = (CVmObjList *)vm_objp(vmg_ mod_val.val.obj);
/*
* As an optimization, if we don't have any properties of our own
* to add to the modifier list, just return the modifier list
* directly (thus avoiding unnecessarily creating another copy of
* the list with no changes).
*/
if (my_prop_cnt == 0)
{
/* the modifier list is the entire return value */
*retval = mod_val;
return;
}
/* get the size of the modifier list */
mod_prop_cnt = vmb_get_len(mod_lst->get_as_list());
}
else
{
/*
* we have no modifier object - for the result list, we simply
* need our own list, so set the modifier list to nil
*/
mod_val.set_nil();
mod_prop_cnt = 0;
mod_lst = 0;
}
/* for gc protection, push the modifier's list */
G_stk->push(&mod_val);
/*
* Allocate a list big enough to hold the modifier's list plus our own
* list.
*/
retval->set_obj(CVmObjList::
create(vmg_ FALSE, my_prop_cnt + mod_prop_cnt));
/* push the return value list for gc protection */
G_stk->push(retval);
/* get it as a list object, properly cast */
lst = (CVmObjList *)vm_objp(vmg_ retval->val.obj);
lst->cons_clear();
/* start the list with our own properties */
if (entry != 0)
list_class_props(vmg_ self, entry, lst, 0, FALSE);
/* copy the modifier list into the results, if there is a modifier list */
if (mod_prop_cnt != 0)
lst->cons_copy_elements(my_prop_cnt, mod_lst->get_as_list());
/* done with the gc protection */
G_stk->discard(2);
}
/*
* readText() - read text from the keyboard and return it as a string.
*/
void CVmBifSample::read_text(VMG_ uint argc)
{
char buf[128];
size_t len;
vm_obj_id_t str_id;
CVmObjString *str_obj;
/* check to make sure we have the right number of arguments */
check_argc(vmg_ argc, 0);
/*
* Read a string from the keyboard. Use fgets() rather than plain
* gets(), because fgets() lets us limit the buffer size and thus avoid
* any chance of a buffer overflow. (Someone should tell the people at
* Microsoft about this - it would probably cut out about eighty
* percent of those emergency internet security alerts that require
* everyone to download an IE patch every couple of weeks. :)
*/
fgets(buf, sizeof(buf), stdin);
/*
* One small detail about fgets: if the input ended with a newline,
* there will be a newline in the buffer. Remove it if it's there.
*/
if ((len = strlen(buf)) != 0 && buf[len - 1] == '\n')
buf[len-1] = '\0';
/*
* As in display_text(), we have to deal with character set mapping
* before we can send the string back to the TADS program. This time,
* we want to perform the conversion from the local character set to
* Unicode. Again, T3 provides a handy conversion object for our
* convenience - this time, it's called G_cmap_from_ui.
*
* In order to return a string to the TADS program, we have to allocate
* a new string object. First, let's see how big a string we need to
* allocate, by calling the character mapper with no buffer space at
* all - the mapper will run through the string and check to see how
* big it will be after conversion, but it won't actually store
* anything.
*/
len = G_cmap_from_ui->map_str(0, 0, buf);
/*
* Allocate a new string to contain the return value. This gives us
* back an "object ID" value, which we can convert into an internal C++
* string object pointer using the vm_objp() formula shown.
*/
str_id = CVmObjString::create(vmg_ FALSE, len);
str_obj = (CVmObjString *)vm_objp(vmg_ str_id);
/*
* The string object has a buffer of the size we requested, which is
* the size we already know we need to contain the mapped string. So,
* we can call the mapper again to have it perform the actual mapping
* into our string buffer.
*/
G_cmap_from_ui->map_str(str_obj->cons_get_buf(), len, buf);
/*
* One last step: we must return the string object to the caller. To
* do this, use the retval_obj() function to return the ID of the
* string object.
*/
retval_obj(vmg_ str_id);
}
/*
* Get a network event
*/
void CVmBifNet::get_event(VMG_ uint oargc)
{
/* check arguments */
check_argc_range(vmg_ oargc, 0, 1);
/* get the timeout, if present */
long timeout = OS_FOREVER;
if (oargc >= 1)
{
if (G_stk->get(0)->typ == VM_NIL)
G_stk->discard();
else
timeout = pop_int_val(vmg0_);
}
/* we don't know the NetEvent subclass yet, so presume the base class */
vm_obj_id_t ev_cl = G_predef->net_event;
int argc;
/* get the next message */
TadsMessage *msg = 0;
int wret = G_net_queue->wait(vmg_ timeout, &msg);
/* cast the message */
TadsEventMessage *evtmsg = cast_tads_message(TadsEventMessage, msg);
/* make sure we release the message before exiting */
err_try
{
/* check the wait result */
const char *err;
switch (wret)
{
case OSWAIT_EVENT + 0:
/* we got a message */
if (evtmsg != 0)
{
/* ask the message to set up a new NetRequestEvent */
int evt_code;
ev_cl = evtmsg->prep_event_obj(vmg_ &argc, &evt_code);
/* add the event type argument */
G_interpreter->push_int(vmg_ evt_code);
++argc;
}
else
{
/* unrecognized message type */
err = "getNetEvent(): unexpected message type in queue";
goto evt_error;
}
break;
case OSWAIT_EVENT + 1:
/* 'quit' event - return an error */
err = "getNetEvent(): queue terminated";
goto evt_error;
case OSWAIT_EVENT + 2:
/* debug break - return a NetEvent with the interrupt code */
argc = 1;
G_interpreter->push_int(vmg_ VMBN_EVT_DBGBRK);
break;
case OSWAIT_TIMEOUT:
/* the timeout expired - return a NetTimeoutEvent */
ev_cl = G_predef->net_timeout_event;
argc = 1;
G_interpreter->push_int(vmg_ VMBN_EVT_TIMEOUT);
break;
case OSWAIT_ERROR:
default:
/* the wait failed */
err = "getNetEvent(): error waiting for request message";
evt_error:
/* on error, throw a NetException describing the problem */
G_interpreter->push_string(vmg_ err);
G_interpreter->throw_new_class(
vmg_ G_predef->net_exception, 1, err);
AFTER_ERR_THROW(break;)
}
/*
* if the specific event type subclass isn't defined, fall back on
* the base NetEvent class
*/
if (ev_cl == VM_INVALID_OBJ)
ev_cl = G_predef->net_event;
/*
* construct the NetEvent subclass, or a generic list if we don't
* even have the NetEvent class defined
*/
if (ev_cl != VM_INVALID_OBJ)
vm_objp(vmg_ ev_cl)->create_instance(vmg_ ev_cl, 0, argc);
else
retval_obj(vmg_ CVmObjList::create_from_stack(vmg_ 0, argc));
}
err_finally
{
/* we're done with the message object */
if (msg != 0)
msg->release_ref();
}
err_end;
}
/*
* Set up the thread. All string parameters are provided in internal
* string format, with VMB_LEN length prefixes.
*/
HttpReqThread(VMG_ const vm_val_t *id, const char *url,
const char *verb, int32 options,
const char *hdrs, vm_val_t *body, const char *body_type,
const vm_rcdesc *rc)
{
/* save the VM globals */
vmg = VMGLOB_ADDR;
/* add a reference on the net event queue */
if ((queue = G_net_queue) != 0)
queue->add_ref();
/* create a global for the ID value */
idg = G_obj_table->create_global_var();
idg->val = *id;
/* save the option flags */
this->options = options;
/* set up to parse the URL */
size_t urll = vmb_get_len(url);
url += VMB_LEN;
/* note whether the scheme is plain http or https */
https = (urll >= 8 && memcmp(url, "https://", 8) == 0);
/* we don't have any URL pieces yet */
host = 0;
resource = 0;
port = (https ? 443 : 80);
/* skip the scheme prefix */
size_t pfx = (urll >= 7 && memcmp(url, "http://", 7) == 0 ? 7 :
urll >= 8 && memcmp(url, "https://", 8) == 0 ? 8 : 0);
url += pfx, urll -= pfx;
/* the host name is the part up to the ':', '/', or end of string */
const char *start;
for (start = url ; urll > 0 && *url != ':' && *url != '/' ;
++url, --urll) ;
/* save the host name */
host = lib_copy_str(start, url - start);
/* parse the port, if present */
if (urll > 0 && *url == ':')
{
/* parse the port number string */
for (--urll, start = ++url, port = 0 ; urll > 0 && *url != '/' ;
++url, --urll)
{
if (is_digit(*url))
port = port*10 + value_of_digit(*url);
}
}
/*
* The rest (including the '/') is the resource string. If there's
* nothing left, the resource is implicitly '/'.
*/
if (urll > 0)
resource = lib_copy_str(url, urll);
else
resource = lib_copy_str("/");
/* make null-terminated copies of the various strings */
this->verb = lib_copy_str(verb + VMB_LEN, vmb_get_len(verb));
this->hdrs = (hdrs == 0 ? 0 :
lib_copy_str(hdrs + VMB_LEN, vmb_get_len(hdrs)));
/* if there's a content body, set up the payload */
this->body = 0;
if (body != 0)
{
/* set up an empty payload */
this->body = new OS_HttpPayload();
/*
* Convert the body to a stream payload, if it's a string or
* ByteArray. If it's a LookupTable, it's a set of form
* fields.
*/
if (body->typ == VM_OBJ
&& CVmObjLookupTable::is_lookup_table_obj(vmg_ body->val.obj))
{
/*
* The body is a LookupTable, so we have a set of form
* fields to encode as HTML form data.
*/
/* cast the object value */
CVmObjLookupTable *tab =
(CVmObjLookupTable *)vm_objp(vmg_ body->val.obj);
/* add each key in the table as a form field */
iter_body_table_ctx ctx(this, rc);
tab->for_each(vmg_ iter_body_table, &ctx);
}
else
{
/*
* It's not a lookup table, so it must be bytes to upload,
* as a string or ByteArray.
*/
const char *def_mime_type = 0;
CVmStream *stream = val_to_stream(vmg_ body, &def_mime_type);
/* presume we're going to use the default mime type */
const char *mime_type = def_mime_type;
size_t mime_type_len =
(mime_type != 0 ? strlen(mime_type) : 0);
/* if the caller specified a mime type, use it instead */
if (body_type != 0)
{
mime_type = body_type + VMB_LEN;
mime_type_len = vmb_get_len(body_type);
}
/* add the stream */
this->body->add(
"", 0, "", 0, mime_type, mime_type_len, stream);
}
}
}
/*
* Connect to the Web UI
*/
void CVmBifNet::connect_ui(VMG_ uint oargc)
{
/* check arguments */
check_argc(vmg_ oargc, 2);
/* get the server object */
vm_val_t *srv = G_stk->get(0);
if (srv->typ != VM_OBJ
|| !CVmObjHTTPServer::is_httpsrv_obj(vmg_ srv->val.obj))
err_throw(VMERR_BAD_TYPE_BIF);
/* get the object pointer properly cast */
CVmObjHTTPServer *srvp = (CVmObjHTTPServer *)vm_objp(vmg_ srv->val.obj);
/* get the URL path */
const char *path = G_stk->get(1)->get_as_string(vmg0_);
if (path == 0)
err_throw(VMERR_BAD_TYPE_BIF);
/* make a null-terminated copy of the path */
char *pathb = lib_copy_str(path + VMB_LEN, vmb_get_len(path));
/* get the server network address information */
char *errmsg = 0;
char *addr = 0, *ip = 0;
int port;
int ok = srvp->get_listener_addr(addr, ip, port);
/*
* If we don't have a network configuration yet, create one. This
* notifies other subsystems that we have an active web UI; for
* example, the presence of a network UI disables the regular console
* UI, since all UI actions have to go through the web UI once it's
* established.
*
* The interpreter startup creates a network configuration if it
* receives command-line information telling it that the game was
* launched by a Web server in response to an incoming client request.
* When the user launches the game in stand-alone mode directly from
* the operating system shell, there's no Web server launch
* information, so the startup code doesn't create a net config object.
* So, if we get here and find we don't have this object, it means that
* we're running in local standalone mode.
*/
if (G_net_config == 0)
G_net_config = new TadsNetConfig();
/* connect */
if (ok)
{
/* connect */
ok = osnet_connect_webui(vmg_ addr, port, pathb, &errmsg);
}
else
{
/* couldn't get the server address */
errmsg = lib_copy_str(
"No address information available for HTTPServer");
}
/* free strings */
lib_free_str(pathb);
lib_free_str(addr);
lib_free_str(ip);
/* if there's an error, throw it */
if (!ok)
{
G_interpreter->push_string(vmg_ errmsg);
lib_free_str(errmsg);
G_interpreter->throw_new_class(vmg_ G_predef->net_exception, 1,
"Error connecting to Web UI");
}
/* no return value */
retval_nil(vmg0_);
}
