9f1067e51a
The embcall2_multif statement is replaced with embcall, which only takes a template name. The selection of the template name is done using the ifel function, generated during desugaring.
568 lines
19 KiB
C
568 lines
19 KiB
C
/**
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* @file call2.c
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* @author Ambroz Bizjak <ambrop7@gmail.com>
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*
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* @section LICENSE
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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* 3. Neither the name of the author nor the
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* names of its contributors may be used to endorse or promote products
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* derived from this software without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" AND
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
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* WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
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* DISCLAIMED. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY
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* DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
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* (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
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* LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
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* ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
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* SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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*
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* @section DESCRIPTION
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*
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*
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* Synopsis:
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* call(string template, list args)
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*
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* Description:
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* Calls a process template. The 'template' argument is the name of the process
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* template to call, and the 'list' argument is a list of arguments for the
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* process template. Calling a process template is roughly equivalent to placing
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* the statements within that template into the place of call(), except for the
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* points presented next. The 'template' argument can be a special value "<none>",
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* which makes call() a no-op.
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*
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* The process created from the called template will be able to access the arguments
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* that were given in the 'args' argument to call() via the '_argN' predefined\
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* objects (e.g. _arg0 for the first argumens), and also via '_args' for the entire
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* argument list.
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*
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* The called process also will be able to access objects within the calling
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* process as seen by the call() statement. However such any access needs to happen
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* via a special '_caller' predefined object. For example, if there is a statement
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* 'var("a") x;' somewhere above the call() statement, the called process can access
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* it as '_caller.x'.
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*
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* Note that call() preserves backtracking semantics, i.e. when a statement within
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* the called process goes down after having gone up, the behaviour really is as
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* if the call() statement was replaced with the statements in the called template,
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* (disregarding variable resolution).
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*
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* Because the template name is an argument, call() can be used for branching.
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* For example, if we have an object 'x' with the value "true" or "false", a
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* branch can be performed by defining two process templates, 'branch_true'
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* and 'branch_false', and branching with the following code:
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*
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* concat("branch_", x) name;
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* call(name, {});
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*
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*
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* Synopsis:
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* call_with_caller_target(string template, list args, string caller_target)
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*
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* Description:
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* Like call(), except that the target of the '_caller' predefined object is
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* specified by the 'caller_target' argument. This is indented to be used from
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* generic code for user-specified callbacks, allowing the user to easily refer to
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* his own objects from inside the callback.
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*
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* The 'caller_target' must be a non-empty string referring to an actual object;
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* there is no choice of 'caller_target' that would make call_with_caller_target()
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* equivalent to call().
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*
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*
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* Synopsis:
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* embcall(string template)
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*
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* Description:
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* Like call, but makes its own scope directly available in the called
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* template process, instead of via _caller. Also, doesn not provide any
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* arguments to the template process.
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*
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*
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* Synopsis:
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* inline_code(string template)
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* inline_code::call(list args)
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*
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* Description:
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* The inline_code() acts as a proxy object for calling the specified template.
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* The inline_code::call calls the template of the corresponding inline_code
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* instance, in a manner similar to a simple "call". The called template will
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* have access to the following resources:
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* - The arguments will be available in the usual fashion.
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* - The scope of the inline_code::call instance will be available as "_caller".
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* - The scope of the inline_code instance will be directly available.
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* - The scope of the inline_code instance will also be available as "_scope".
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* This is useful to access shadowed names, e.g. "_caller" and the arguments
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* stuff (_argN, _args).
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*/
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#include <stdlib.h>
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#include <string.h>
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#include <misc/debug.h>
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#include <misc/offset.h>
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#include <structure/LinkedList0.h>
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#include <ncd/extra/NCDFastNames.h>
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#include <ncd/module_common.h>
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#include <generated/blog_channel_ncd_call2.h>
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#define STATE_WORKING 1
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#define STATE_UP 2
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#define STATE_WAITING 3
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#define STATE_TERMINATING 4
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#define STATE_NONE 5
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struct instance;
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typedef void (*call_extra_free_cb) (struct instance *o);
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struct instance {
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NCDModuleInst *i;
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call_extra_free_cb extra_free_cb;
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NCDModuleProcess process;
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int state;
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};
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struct instance_with_caller_target {
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struct instance base;
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NCDFastNames names;
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};
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struct inline_code {
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NCDModuleInst *i;
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NCDValRef template_name;
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LinkedList0 calls_list;
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};
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struct inline_code_call {
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struct instance base;
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struct inline_code *ic;
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LinkedList0Node ic_node;
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};
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static void process_handler_event (NCDModuleProcess *process, int event);
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static int process_func_getspecialobj_embed (NCDModuleProcess *process, NCD_string_id_t name, NCDObject *out_object);
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static int process_func_getspecialobj_noembed (NCDModuleProcess *process, NCD_string_id_t name, NCDObject *out_object);
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static int process_func_getspecialobj_with_caller_target (NCDModuleProcess *process, NCD_string_id_t name, NCDObject *out_object);
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static int caller_obj_func_getobj (const NCDObject *obj, NCD_string_id_t name, NCDObject *out_object);
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static int caller_obj_func_getobj_with_caller_target (const NCDObject *obj, NCD_string_id_t name, NCDObject *out_object);
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static void func_new_templ (void *vo, NCDModuleInst *i, NCDValRef template_name, NCDValRef args, NCDModuleProcess_func_getspecialobj func_getspecialobj, call_extra_free_cb extra_free_cb);
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static void instance_free (struct instance *o);
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static void call_with_caller_target_extra_free (struct instance *bo);
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static void inline_code_extra_free (struct instance *bo);
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static int inline_code_call_process_getspecialobj (NCDModuleProcess *process, NCD_string_id_t name, NCDObject *out_object);
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static int inline_code_scope_obj_getobj (const NCDObject *obj, NCD_string_id_t name, NCDObject *out_object);
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static void process_handler_event (NCDModuleProcess *process, int event)
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{
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struct instance *o = UPPER_OBJECT(process, struct instance, process);
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switch (event) {
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case NCDMODULEPROCESS_EVENT_UP: {
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ASSERT(o->state == STATE_WORKING)
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// signal up
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NCDModuleInst_Backend_Up(o->i);
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// set state up
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o->state = STATE_UP;
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} break;
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case NCDMODULEPROCESS_EVENT_DOWN: {
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ASSERT(o->state == STATE_UP)
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// signal down
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NCDModuleInst_Backend_Down(o->i);
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// set state waiting
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o->state = STATE_WAITING;
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} break;
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case NCDMODULEPROCESS_EVENT_TERMINATED: {
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ASSERT(o->state == STATE_TERMINATING)
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// die finally
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instance_free(o);
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return;
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} break;
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default: ASSERT(0);
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}
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}
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static int process_func_getspecialobj_embed (NCDModuleProcess *process, NCD_string_id_t name, NCDObject *out_object)
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{
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struct instance *o = UPPER_OBJECT(process, struct instance, process);
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return NCDModuleInst_Backend_GetObj(o->i, name, out_object);
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}
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static int process_func_getspecialobj_noembed (NCDModuleProcess *process, NCD_string_id_t name, NCDObject *out_object)
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{
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struct instance *o = UPPER_OBJECT(process, struct instance, process);
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if (name == NCD_STRING_CALLER) {
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*out_object = NCDObject_Build(-1, o, NCDObject_no_getvar, caller_obj_func_getobj);
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return 1;
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}
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return 0;
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}
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static int process_func_getspecialobj_with_caller_target (NCDModuleProcess *process, NCD_string_id_t name, NCDObject *out_object)
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{
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struct instance *o = UPPER_OBJECT(process, struct instance, process);
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if (name == NCD_STRING_CALLER) {
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*out_object = NCDObject_Build(-1, o, NCDObject_no_getvar, caller_obj_func_getobj_with_caller_target);
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return 1;
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}
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return 0;
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}
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static int caller_obj_func_getobj (const NCDObject *obj, NCD_string_id_t name, NCDObject *out_object)
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{
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struct instance *o = NCDObject_DataPtr(obj);
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return NCDModuleInst_Backend_GetObj(o->i, name, out_object);
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}
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static int caller_obj_func_getobj_with_caller_target (const NCDObject *obj, NCD_string_id_t name, NCDObject *out_object)
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{
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struct instance_with_caller_target *o_ch = NCDObject_DataPtr(obj);
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NCD_string_id_t *names = NCDFastNames_GetNames(&o_ch->names);
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NCDObject object;
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if (!NCDModuleInst_Backend_GetObj(o_ch->base.i, names[0], &object)) {
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return 0;
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}
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NCDObject obj2;
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if (!NCDObject_ResolveObjExprCompact(&object, names + 1, NCDFastNames_GetNumNames(&o_ch->names) - 1, &obj2)) {
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return 0;
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}
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if (name == NCD_STRING_EMPTY) {
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*out_object = obj2;
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return 1;
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}
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return NCDObject_GetObj(&obj2, name, out_object);
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}
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static void func_new_templ (void *vo, NCDModuleInst *i, NCDValRef template_name, NCDValRef args, NCDModuleProcess_func_getspecialobj func_getspecialobj, call_extra_free_cb extra_free_cb)
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{
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ASSERT(NCDVal_IsInvalid(template_name) || NCDVal_IsString(template_name))
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ASSERT(NCDVal_IsInvalid(args) || NCDVal_IsList(args))
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ASSERT(func_getspecialobj)
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struct instance *o = vo;
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o->i = i;
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o->extra_free_cb = extra_free_cb;
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if (NCDVal_IsInvalid(template_name) || ncd_is_none(template_name)) {
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// signal up
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NCDModuleInst_Backend_Up(o->i);
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// set state none
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o->state = STATE_NONE;
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} else {
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// create process
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if (!NCDModuleProcess_InitValue(&o->process, o->i, template_name, args, process_handler_event)) {
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ModuleLog(o->i, BLOG_ERROR, "NCDModuleProcess_Init failed");
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goto fail1;
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}
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// set special functions
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NCDModuleProcess_SetSpecialFuncs(&o->process, func_getspecialobj);
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// set state working
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o->state = STATE_WORKING;
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}
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return;
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fail1:
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if (o->extra_free_cb) {
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o->extra_free_cb(o);
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}
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NCDModuleInst_Backend_DeadError(i);
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}
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static void instance_free (struct instance *o)
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{
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if (o->extra_free_cb) {
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o->extra_free_cb(o);
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}
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// free process
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if (o->state != STATE_NONE) {
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NCDModuleProcess_Free(&o->process);
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}
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NCDModuleInst_Backend_Dead(o->i);
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}
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static void func_new_call (void *vo, NCDModuleInst *i, const struct NCDModuleInst_new_params *params)
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{
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NCDValRef template_arg;
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NCDValRef args_arg;
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if (!NCDVal_ListRead(params->args, 2, &template_arg, &args_arg)) {
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ModuleLog(i, BLOG_ERROR, "wrong arity");
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goto fail0;
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}
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if (!NCDVal_IsString(template_arg) || !NCDVal_IsList(args_arg)) {
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ModuleLog(i, BLOG_ERROR, "wrong type");
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goto fail0;
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}
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func_new_templ(vo, i, template_arg, args_arg, process_func_getspecialobj_noembed, NULL);
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return;
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fail0:
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NCDModuleInst_Backend_DeadError(i);
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}
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static void func_new_call_with_caller_target (void *vo, NCDModuleInst *i, const struct NCDModuleInst_new_params *params)
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{
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NCDValRef template_arg;
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NCDValRef args_arg;
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NCDValRef caller_target_arg;
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if (!NCDVal_ListRead(params->args, 3, &template_arg, &args_arg, &caller_target_arg)) {
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ModuleLog(i, BLOG_ERROR, "wrong arity");
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goto fail0;
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}
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if (!NCDVal_IsString(template_arg) || !NCDVal_IsList(args_arg) || !NCDVal_IsString(caller_target_arg)) {
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ModuleLog(i, BLOG_ERROR, "wrong type");
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goto fail0;
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}
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struct instance_with_caller_target *o = vo;
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int res = NCDFastNames_Init(&o->names, i->params->iparams->string_index, NCDVal_StringMemRef(caller_target_arg));
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if (!res) {
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ModuleLog(i, BLOG_ERROR, "NCDFastNames_Init failed");
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goto fail0;
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}
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func_new_templ(vo, i, template_arg, args_arg, process_func_getspecialobj_with_caller_target, call_with_caller_target_extra_free);
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return;
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fail0:
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NCDModuleInst_Backend_DeadError(i);
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}
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static void call_with_caller_target_extra_free (struct instance *bo)
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{
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struct instance_with_caller_target *o = (void *)bo;
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NCDFastNames_Free(&o->names);
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}
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static void func_new_embcall (void *vo, NCDModuleInst *i, const struct NCDModuleInst_new_params *params)
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{
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NCDValRef template_arg;
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if (!NCDVal_ListRead(params->args, 1, &template_arg)) {
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ModuleLog(i, BLOG_ERROR, "wrong arity");
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goto fail0;
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}
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if (!NCDVal_IsString(template_arg)) {
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ModuleLog(i, BLOG_ERROR, "wrong type");
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goto fail0;
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}
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func_new_templ(vo, i, template_arg, NCDVal_NewInvalid(), process_func_getspecialobj_embed, NULL);
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return;
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fail0:
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NCDModuleInst_Backend_DeadError(i);
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}
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static void func_die (void *vo)
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{
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struct instance *o = vo;
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ASSERT(o->state != STATE_TERMINATING)
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// if none, die now
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if (o->state == STATE_NONE) {
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instance_free(o);
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return;
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}
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// request process to terminate
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NCDModuleProcess_Terminate(&o->process);
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// set state terminating
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o->state = STATE_TERMINATING;
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}
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static void func_clean (void *vo)
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{
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struct instance *o = vo;
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if (o->state != STATE_WAITING) {
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return;
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}
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// allow process to continue
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NCDModuleProcess_Continue(&o->process);
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// set state working
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o->state = STATE_WORKING;
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}
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static int func_getobj (void *vo, NCD_string_id_t name, NCDObject *out_object)
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{
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struct instance *o = vo;
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if (o->state == STATE_NONE) {
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return 0;
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}
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return NCDModuleProcess_GetObj(&o->process, name, out_object);
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}
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static void inline_code_new (void *vo, NCDModuleInst *i, const struct NCDModuleInst_new_params *params)
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{
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NCDValRef template_arg;
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if (!NCDVal_ListRead(params->args, 1, &template_arg)) {
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ModuleLog(i, BLOG_ERROR, "wrong arity");
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goto fail0;
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}
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if (!NCDVal_IsString(template_arg)) {
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ModuleLog(i, BLOG_ERROR, "wrong type");
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goto fail0;
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}
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struct inline_code *o = vo;
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o->i = i;
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o->template_name = template_arg;
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LinkedList0_Init(&o->calls_list);
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NCDModuleInst_Backend_Up(i);
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return;
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fail0:
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NCDModuleInst_Backend_DeadError(i);
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}
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static void inline_code_die (void *vo)
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{
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struct inline_code *o = vo;
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for (LinkedList0Node *ln = LinkedList0_GetFirst(&o->calls_list); ln; ln = LinkedList0Node_Next(ln)) {
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struct inline_code_call *call = UPPER_OBJECT(ln, struct inline_code_call, ic_node);
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ASSERT(call->ic == o)
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call->ic = NULL;
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}
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NCDModuleInst_Backend_Dead(o->i);
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}
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static void inline_code_call_new (void *vo, NCDModuleInst *i, const struct NCDModuleInst_new_params *params)
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{
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struct inline_code_call *o = vo;
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o->ic = NCDModuleInst_Backend_GetUser((NCDModuleInst *)params->method_user);
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LinkedList0_Prepend(&o->ic->calls_list, &o->ic_node);
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func_new_templ(vo, i, o->ic->template_name, params->args, inline_code_call_process_getspecialobj, inline_code_extra_free);
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}
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static void inline_code_extra_free (struct instance *bo)
|
|
{
|
|
struct inline_code_call *o = (void *)bo;
|
|
|
|
if (o->ic) {
|
|
LinkedList0_Remove(&o->ic->calls_list, &o->ic_node);
|
|
}
|
|
}
|
|
|
|
static int inline_code_call_process_getspecialobj (NCDModuleProcess *process, NCD_string_id_t name, NCDObject *out_object)
|
|
{
|
|
struct inline_code_call *o = UPPER_OBJECT(process, struct inline_code_call, base.process);
|
|
|
|
if (name == NCD_STRING_CALLER) {
|
|
*out_object = NCDObject_Build(-1, o, NCDObject_no_getvar, caller_obj_func_getobj);
|
|
return 1;
|
|
}
|
|
|
|
if (!o->ic) {
|
|
ModuleLog(o->base.i, BLOG_ERROR, "inline_code object is gone");
|
|
return 0;
|
|
}
|
|
|
|
if (name == NCD_STRING_SCOPE) {
|
|
*out_object = NCDObject_Build(-1, o->ic, NCDObject_no_getvar, inline_code_scope_obj_getobj);
|
|
return 1;
|
|
}
|
|
|
|
return NCDModuleInst_Backend_GetObj(o->ic->i, name, out_object);
|
|
}
|
|
|
|
static int inline_code_scope_obj_getobj (const NCDObject *obj, NCD_string_id_t name, NCDObject *out_object)
|
|
{
|
|
struct inline_code *ic = NCDObject_DataPtr(obj);
|
|
|
|
return NCDModuleInst_Backend_GetObj(ic->i, name, out_object);
|
|
}
|
|
|
|
static struct NCDModule modules[] = {
|
|
{
|
|
.type = "call",
|
|
.func_new2 = func_new_call,
|
|
.func_die = func_die,
|
|
.func_clean = func_clean,
|
|
.func_getobj = func_getobj,
|
|
.flags = NCDMODULE_FLAG_CAN_RESOLVE_WHEN_DOWN,
|
|
.alloc_size = sizeof(struct instance)
|
|
}, {
|
|
.type = "call_with_caller_target",
|
|
.func_new2 = func_new_call_with_caller_target,
|
|
.func_die = func_die,
|
|
.func_clean = func_clean,
|
|
.func_getobj = func_getobj,
|
|
.flags = NCDMODULE_FLAG_CAN_RESOLVE_WHEN_DOWN,
|
|
.alloc_size = sizeof(struct instance_with_caller_target)
|
|
}, {
|
|
.type = "embcall",
|
|
.func_new2 = func_new_embcall,
|
|
.func_die = func_die,
|
|
.func_clean = func_clean,
|
|
.func_getobj = func_getobj,
|
|
.flags = NCDMODULE_FLAG_CAN_RESOLVE_WHEN_DOWN,
|
|
.alloc_size = sizeof(struct instance)
|
|
}, {
|
|
.type = "inline_code",
|
|
.func_new2 = inline_code_new,
|
|
.func_die = inline_code_die,
|
|
.alloc_size = sizeof(struct inline_code)
|
|
}, {
|
|
.type = "inline_code::call",
|
|
.func_new2 = inline_code_call_new,
|
|
.func_die = func_die,
|
|
.func_clean = func_clean,
|
|
.func_getobj = func_getobj,
|
|
.flags = NCDMODULE_FLAG_CAN_RESOLVE_WHEN_DOWN,
|
|
.alloc_size = sizeof(struct inline_code_call)
|
|
}, {
|
|
.type = NULL
|
|
}
|
|
};
|
|
|
|
const struct NCDModuleGroup ncdmodule_call2 = {
|
|
.modules = modules
|
|
};
|