/** @file
Parser: executor part of request class.
Copyright (c) 2001 ArtLebedev Group (http://www.artlebedev.com)
Author: Alexander Petrosyan <paf@design.ru> (http://design.ru/paf)
$Id: execute.C,v 1.136 2001/04/03 05:23:41 paf Exp $
*/
#include "pa_config_includes.h"
#include "code.h"
#include "pa_array.h"
#include "pa_request.h"
#include "pa_vstring.h"
#include "pa_vhash.h"
#include "pa_vunknown.h"
#include "pa_vcframe.h"
#include "pa_vmframe.h"
#include "pa_vobject.h"
#include "pa_vdouble.h"
#include "pa_vbool.h"
#include "pa_vtable.h"
#include "pa_vfile.h"
#include <stdio.h>
#define PUSH(value) stack.push(value)
#define POP() static_cast<Value *>(stack.pop())
#define POP_NAME() static_cast<Value *>(stack.pop())->as_string()
char *opcode_name[]={
// literals
"VALUE", "CURLY_CODE__STORE_PARAM", "EXPR_CODE__STORE_PARAM",
// actions
"WITH_SELF", "WITH_ROOT", "WITH_READ", "WITH_WRITE",
"GET_CLASS",
"CONSTRUCT_VALUE", "CONSTRUCT_DOUBLE",
"WRITE_VALUE", "WRITE_EXPR_RESULT", "STRING__WRITE",
"GET_ELEMENT", "GET_ELEMENT__WRITE",
"CREATE_EWPOOL", "REDUCE_EWPOOL",
"CREATE_RWPOOL", "REDUCE_RWPOOL",
"CREATE_SWPOOL", "REDUCE_SWPOOL",
"GET_METHOD_FRAME",
"STORE_PARAM",
"CALL",
// expression ops: unary
"NEG", "INV", "NOT", "DEF", "IN", "FEXISTS",
// expression ops: binary
"SUB", "ADD", "MUL", "DIV", "MOD",
"BIN_AND", "BIN_OR", "BIN_XOR",
"LOG_AND", "LOG_OR", "LOG_XOR",
"NUM_LT", "NUM_GT", "NUM_LE", "NUM_GE", "NUM_EQ", "NUM_NE",
"STR_LT", "STR_GT", "STR_LE", "STR_GE", "STR_EQ", "STR_NE",
"IS"
};
void va_log_printf(Pool& pool, const char *fmt,va_list args) {
return;
char buf[MAX_STRING];
vsnprintf(buf, MAX_STRING, fmt, args);
SAPI::log(pool, "%s", buf);
}
void log_printf(Pool& pool, const char *fmt, ...) {
va_list args;
va_start(args,fmt);
va_log_printf(pool,fmt,args);
va_end(args);
}
void dump(Pool& pool, int level, const Array& ops) {
if(0){
int size=ops.quick_size();
//log_printf(pool, "size=%d\n", size);
for(int i=0; i<size; i++) {
Operation op;
op.cast=ops.quick_get(i);
log_printf(pool, "%8X\n", op.cast);
}
}
int size=ops.quick_size();
//log_printf(pool, "size=%d\n", size);
for(int i=0; i<size; i++) {
Operation op;
op.cast=ops.quick_get(i);
if(op.code==OP_VALUE || op.code==OP_STRING__WRITE) {
Value *value=static_cast<Value *>(ops.quick_get(++i));
log_printf(pool,
"%*s%s"
" \"%s\" %s",
level*4, "", opcode_name[op.code],
value->get_string()->cstr(), value->type());
continue;
}
log_printf(pool, "%*s%s", level*4, "", opcode_name[op.code]);
if(op.code==OP_CURLY_CODE__STORE_PARAM || op.code==OP_EXPR_CODE__STORE_PARAM) {
const Array *local_ops=reinterpret_cast<const Array *>(ops.quick_get(++i));
dump(pool, level+1, *local_ops);
}
}
}
void Request::execute(const Array& ops) {
if(1) {
log_printf(pool(), "source----------------------------\n");
dump(pool(), 0, ops);
log_printf(pool(), "execution-------------------------\n");
}
int size=ops.quick_size();
//log_printf(pool(), "size=%d\n", size);
for(int i=0; i<size; i++) {
Operation op;
op.cast=ops.quick_get(i);
log_printf(pool(), "%d:%s", stack.top_index()+1, opcode_name[op.code]);
switch(op.code) {
// param in next instruction
case OP_VALUE:
{
Value *value=static_cast<Value *>(ops.quick_get(++i));
log_printf(pool(), " \"%s\" %s", value->get_string()->cstr(), value->type());
PUSH(value);
break;
}
case OP_CURLY_CODE__STORE_PARAM:
case OP_EXPR_CODE__STORE_PARAM:
{
VMethodFrame *frame=static_cast<VMethodFrame *>(stack.top_value());
// code
const Array *local_ops=reinterpret_cast<const Array *>(ops.quick_get(++i));
log_printf(pool(), " (%d)\n", local_ops->size());
dump(pool(), 1, *local_ops);
// when called method of some object, specifying object literally,
// e.g ^t.menu, code of curly params must be executed
// in r/w context of that object.
// otherwise in current r/w context.
//
// when they evaluate expression parameter,
// the object expression result
// does not need to be written into calling frame
// it must go into any expressions using that parameter
// hence, zeroing junction.wcontext being created
// later, in .process we would test that field
// in decision "which wwrapper to use"
Junction& j=*NEW Junction(pool(),
*self, 0, 0,
root,
wcontext->somebody_entered_some_object()>1?
&frame->junction.self /* ^t.menu{} */:rcontext/* ^if() */,
op.code==OP_EXPR_CODE__STORE_PARAM?
0:wcontext->somebody_entered_some_object()>1?
frame/* ^t.menu{} */:wcontext/* ^if() */,
local_ops);
Value *value=NEW VJunction(j);
// store param
frame->store_param(frame->name(), value);
break;
}
case OP_GET_CLASS:
{
// maybe they do ^class:method[] call, remember the fact
wcontext->set_somebody_entered_some_class();
const String& name=POP_NAME();
Value *value=static_cast<Value *>(classes().get(name));
if(!value)
THROW(0,0,
&name,
": undefined class");
PUSH(value);
break;
}
// OP_WITH
case OP_WITH_SELF:
{
PUSH(self);
break;
}
case OP_WITH_ROOT:
{
PUSH(root);
break;
}
case OP_WITH_READ:
{
PUSH(rcontext);
break;
}
case OP_WITH_WRITE:
{
PUSH(wcontext);
break;
}
// OTHER ACTIONS BUT WITHs
case OP_CONSTRUCT_VALUE:
{
Value *value=POP();
const String& name=POP_NAME();
Value *ncontext=POP();
ncontext->put_element(name, value);
value->set_name(name);
break;
}
case OP_CONSTRUCT_EXPR:
{
Value *value=POP();
const String& name=POP_NAME();
Value *ncontext=POP();
ncontext->put_element(name, value->as_expr_result());
value->set_name(name);
break;
}
case OP_WRITE_VALUE:
{
Value *value=POP();
write_assign_lang(*value);
break;
}
case OP_WRITE_EXPR_RESULT:
{
Value *value=POP();
write_expr_result(*value->as_expr_result());
break;
}
case OP_STRING__WRITE:
{
VString *vstring=static_cast<VString *>(ops.quick_get(++i));
log_printf(pool(), " \"%s\"", vstring->string().cstr());
write_no_lang(vstring->string());
break;
}
case OP_GET_ELEMENT:
{
// maybe they do ^object.method[] call, remember the fact
wcontext->inc_somebody_entered_some_object();
Value *value=get_element();
PUSH(value);
break;
}
case OP_GET_ELEMENT__WRITE:
{
Value *value=get_element();
write_assign_lang(*value);
break;
}
case OP_CREATE_EWPOOL:
{
PUSH(wcontext);
wcontext=NEW WWrapper(pool(), 0 /* empty */, true /* constructing */);
break;
}
case OP_REDUCE_EWPOOL:
{
Value *value=wcontext->result();
wcontext=static_cast<WContext *>(POP());
PUSH(value);
break;
}
case OP_CREATE_RWPOOL:
{
Value *ncontext=POP();
PUSH(rcontext);
rcontext=ncontext;
PUSH(wcontext);
wcontext=NEW WWrapper(pool(), ncontext, false /* not constructing */);
break;
}
case OP_REDUCE_RWPOOL:
{
const String *string=wcontext->get_string();
Value *value;
if(string)
value=NEW VString(*string);
else
value=NEW VUnknown(pool());
wcontext=static_cast<WContext *>(POP());
rcontext=POP();
PUSH(value);
break;
}
case OP_CREATE_SWPOOL:
{
PUSH(wcontext);
wcontext=NEW WWrapper(pool(), 0 /* empty */, false /* not constructing */);
break;
}
case OP_REDUCE_SWPOOL:
{
// from "$a $b" part of expression taking only string value,
// ignoring any other content of wcontext
const String *string=wcontext->get_string();
Value *value;
if(string)
value=NEW VString(*string);
else
NEW VUnknown(pool());
wcontext=static_cast<WContext *>(POP());
PUSH(value);
break;
}
// CALL
case OP_GET_METHOD_FRAME:
{
Value *value=POP();
// info:
// code compiled so that this one's always method-junction,
// not a code-junction
Junction *junction=value->get_junction();
if(!junction)
THROW(0,0,
&value->name(),
"(%s) not a method or junction, can not call it",
value->type());
VMethodFrame *frame=NEW VMethodFrame(pool(), *junction);
frame->set_name(value->name());
PUSH(frame);
break;
}
case OP_STORE_PARAM:
{
Value *value=POP();
VMethodFrame *frame=static_cast<VMethodFrame *>(stack.top_value());
frame->store_param(frame->name(), value);
break;
}
case OP_CALL:
{
log_printf(pool(), "->\n");
VMethodFrame *frame=static_cast<VMethodFrame *>(POP());
frame->fill_unspecified_params();
PUSH(self);
PUSH(root);
PUSH(rcontext);
PUSH(wcontext);
VStateless_class *called_class=frame->junction.self.get_class();
// is context object or class & is it my class or my parent's class?
VStateless_class *read_class=rcontext->get_class();
if(read_class && read_class->is_or_derived_from(*called_class)) // yes
self=rcontext; // class dynamic call
else // no, not me or relative of mine (total stranger)
if(
wcontext->constructing() && // constructing?
wcontext->somebody_entered_some_class()) { // ^class:method[..]?
// yes, this is a constructor call
// some stateless_object derivates with constructors
if(called_class==table_class)
self=NEW VTable(pool());
else if(called_class==file_class)
self=NEW VFile(pool());
else // stateful object
self=NEW VObject(pool(), *called_class);
frame->write(*self,
String::UL_CLEAN // not used, always an object, not string
);
} else
self=&frame->junction.self; // no, static or simple dynamic call
frame->set_self(*self);
root=rcontext=wcontext=frame;
{
// take object or class from any wrappers
// and substitute class alias to the class they are called AS
Temp_alias temp_alias(*self->get_aliased(), *frame->junction.vclass);
const Method& method=*frame->junction.method;
Method::Call_type call_type=
called_class==self ? Method::CT_STATIC : Method::CT_DYNAMIC;
if(
method.call_type==Method::CT_ANY ||
method.call_type==call_type) // allowed call type?
if(method.native_code) { // native code?
method.check_actual_numbered_params(
frame->junction.self,
frame->name(), frame->numbered_params());
(*method.native_code)(
*this,
frame->name(), frame->numbered_params()); // execute it
} else // parser code
execute(*method.parser_code); // execute it
else
THROW(0, 0,
&frame->name(),
"is not allowed to be called %s",
call_type==Method::CT_STATIC?"statically":"dynamically");
}
Value *value=wcontext->result();
wcontext=static_cast<WContext *>(POP());
rcontext=POP();
root=POP();
self=static_cast<VAliased *>(POP());
PUSH(value);
log_printf(pool(), "<-returned");
break;
}
// expression ops: unary
case OP_NEG:
{
Value *operand=POP();
Value *value=NEW VDouble(pool(), -operand->as_double());
PUSH(value);
break;
}
case OP_INV:
{
Value *operand=POP();
Value *value=NEW VDouble(pool(), ~(int)operand->as_double());
PUSH(value);
break;
}
case OP_NOT:
{
Value *operand=POP();
Value *value=NEW VBool(pool(), !operand->as_bool());
PUSH(value);
break;
}
case OP_DEF:
{
Value *operand=POP();
Value *value=NEW VBool(pool(), operand->is_defined());
PUSH(value);
break;
}
case OP_IN:
{
Value *operand=POP();
const char *path=operand->as_string().cstr();
Value *value=NEW VBool(pool(), info.uri && strcmp(path, info.uri)<=0);
PUSH(value);
break;
}
case OP_FEXISTS:
{
Value *operand=POP();
Value *value=NEW VBool(pool(),
file_readable(absolute(operand->as_string())));
PUSH(value);
break;
}
// expression ops: binary
case OP_SUB:
{
Value *b=POP(); Value *a=POP();
Value *value=NEW VDouble(pool(), a->as_double() - b->as_double());
PUSH(value);
break;
}
case OP_ADD:
{
Value *b=POP(); Value *a=POP();
Value *value=NEW VDouble(pool(), a->as_double() + b->as_double());
PUSH(value);
break;
}
case OP_MUL:
{
Value *b=POP(); Value *a=POP();
Value *value=NEW VDouble(pool(), a->as_double() * b->as_double());
PUSH(value);
break;
}
case OP_DIV:
{
Value *b=POP(); Value *a=POP();
Value *value=NEW VDouble(pool(), a->as_double() / b->as_double());
PUSH(value);
break;
}
case OP_MOD:
{
Value *b=POP(); Value *a=POP();
Value *value=NEW VDouble(pool(),
(int)a->as_double() %
(int)b->as_double());
PUSH(value);
break;
}
case OP_BIN_AND:
{
Value *b=POP(); Value *a=POP();
Value *value=NEW VDouble(pool(),
(int)a->as_double() &
(int)b->as_double());
PUSH(value);
break;
}
case OP_BIN_OR:
{
Value *b=POP(); Value *a=POP();
Value *value=NEW VDouble(pool(),
(int)a->as_double() |
(int)b->as_double());
PUSH(value);
break;
}
case OP_BIN_XOR:
{
Value *b=POP(); Value *a=POP();
Value *value=NEW VDouble(pool(),
(int)a->as_double() ^
(int)b->as_double());
PUSH(value);
break;
}
case OP_LOG_AND:
{
Value *b=POP(); Value *a=POP();
Value *value=NEW VBool(pool(), a->as_bool() && b->as_bool());
PUSH(value);
break;
}
case OP_LOG_OR:
{
Value *b=POP(); Value *a=POP();
Value *value=NEW VBool(pool(), a->as_bool() || b->as_bool());
PUSH(value);
break;
}
case OP_LOG_XOR:
{
Value *b=POP(); Value *a=POP();
Value *value=NEW VBool(pool(), a->as_bool() ^ b->as_bool());
PUSH(value);
break;
}
case OP_NUM_LT:
{
Value *b=POP(); Value *a=POP();
Value *value=NEW VBool(pool(), a->as_double() < b->as_double());
PUSH(value);
break;
}
case OP_NUM_GT:
{
Value *b=POP(); Value *a=POP();
Value *value=NEW VBool(pool(), a->as_double() > b->as_double());
PUSH(value);
break;
}
case OP_NUM_LE:
{
Value *b=POP(); Value *a=POP();
Value *value=NEW VBool(pool(), a->as_double() <= b->as_double());
PUSH(value);
break;
}
case OP_NUM_GE:
{
Value *b=POP(); Value *a=POP();
Value *value=NEW VBool(pool(), a->as_double() >= b->as_double());
PUSH(value);
break;
}
case OP_NUM_EQ:
{
Value *b=POP(); Value *a=POP();
Value *value=NEW VBool(pool(), a->as_double() == b->as_double());
PUSH(value);
break;
}
case OP_NUM_NE:
{
Value *b=POP(); Value *a=POP();
Value *value=NEW VBool(pool(), a->as_double() != b->as_double());
PUSH(value);
break;
}
case OP_STR_LT:
{
Value *b=POP(); Value *a=POP();
Value *value=NEW VBool(pool(), a->as_string() < b->as_string());
PUSH(value);
break;
}
case OP_STR_GT:
{
Value *b=POP(); Value *a=POP();
Value *value=NEW VBool(pool(), a->as_string() > b->as_string());
PUSH(value);
break;
}
case OP_STR_LE:
{
Value *b=POP(); Value *a=POP();
Value *value=NEW VBool(pool(), a->as_string() <= b->as_string());
PUSH(value);
break;
}
case OP_STR_GE:
{
Value *b=POP(); Value *a=POP();
Value *value=NEW VBool(pool(), a->as_string() >= b->as_string());
PUSH(value);
break;
}
case OP_STR_EQ:
{
Value *b=POP(); Value *a=POP();
Value *value=NEW VBool(pool(), a->as_string() == b->as_string());
PUSH(value);
break;
}
case OP_STR_NE:
{
Value *b=POP(); Value *a=POP();
Value *value=NEW VBool(pool(), a->as_string() != b->as_string());
PUSH(value);
break;
}
case OP_IS:
{
Value *b=POP(); Value *a=POP();
Value *value=NEW VBool(pool(), b->as_string() == a->type());
PUSH(value);
break;
}
default:
THROW(0,0,
0,
"unhandled '%s' opcode", opcode_name[op.code]);
}
}
}
Value *Request::get_element() {
const String& name=POP_NAME();
Value *ncontext=POP();
Value *value=ncontext->get_element(name);
if(value)
value=&process(*value, &name); // process possible code-junction
else {
value=NEW VUnknown(pool());
value->set_name(name);
}
return value;
}
/**
intercept_string:
- true:
they want result=string value,
possible object result goes to wcontext
- false:
they want any result[string|object]
nothing goes to wcontext.
used in @c (expression) params evaluation
*/
Value& Request::process(Value& value, const String *name, bool intercept_string) {
Value *result;
Junction *junction=value.get_junction();
if(junction && junction->code) { // is it a code-junction?
// process it
log_printf(pool(), "ja->\n");
PUSH(self);
PUSH(root);
PUSH(rcontext);
PUSH(wcontext);
WContext *frame;
// for expression method params
// wcontext is set 0
// using the fact in decision "which wwrapper to use"
bool using_code_frame=intercept_string && junction->wcontext;
if(using_code_frame) {
// almost plain wwrapper about junction wcontext,
// BUT intercepts string writes
frame=NEW VCodeFrame(pool(), *junction->wcontext);
} else {
// plain wwrapper
frame=NEW WWrapper(pool(), 0/*empty*/, false/*not constructing*/);
}
wcontext=frame;
self=&junction->self;
root=junction->root;
rcontext=junction->rcontext;
execute(*junction->code);
if(using_code_frame) {
// CodeFrame soul:
// string writes were intercepted
// returning them as the result of getting code-junction
result=NEW VString(*frame->get_string());
} else
result=frame->result();
wcontext=static_cast<WContext *>(POP());
rcontext=POP();
root=POP();
self=static_cast<VAliased *>(POP());
log_printf(pool(), "<-ja returned");
} else
result=&value;
if(name)
result->set_name(*name);
return *result;
}
const String *Request::execute_method(Value& aself, const Method& method, bool return_cstr) {
PUSH(self);
PUSH(root);
PUSH(rcontext);
PUSH(wcontext);
// initialize contexts
root=rcontext=self=&aself;
wcontext=NEW WWrapper(pool(), &aself, false /* not constructing */);
// execute!
execute(*method.parser_code);
// result
const String *result;
if(return_cstr)
result=&wcontext->as_string();
else
result=0; // ignore result
wcontext=static_cast<WContext *>(POP());
rcontext=POP();
root=POP();
self=static_cast<VAliased *>(POP());
// return
return result;
}
const String *Request::execute_method(Value& aself,
const String& method_name, bool return_cstr) {
if(Value *value=aself.get_element(method_name))
if(Junction *junction=value->get_junction())
if(const Method *method=junction->method)
return execute_method(aself, *method, return_cstr);
return 0;
}
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