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/*
* cook - file construction tool
* Copyright (C) 1997 Peter Miller;
* All rights reserved.
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2 of the License, or
* (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111, USA.
*
* MANIFEST: functions to manipulate command statement nodes
*/
#include <expr.h>
#include <expr/list.h>
#include <expr/position.h>
#include <opcode/command.h>
#include <opcode/list.h>
#include <opcode/push.h>
#include <stmt.h>
#include <stmt/command.h>
#include <trace.h>
typedef struct stmt_command_ty stmt_command_ty;
struct stmt_command_ty
{
stmt_ty inherited;
expr_list_ty args;
expr_list_ty flags;
expr_ty *input;
expr_position_ty pos;
};
/*
* NAME
* destructor - free a command statement node
*
* SYNOPSIS
* void destructor(stmt_ty *sp);
*
* DESCRIPTION
* The destructor function releases the resources held by a command
* statement instance after it is finished with.
*
* CAVEAT
* Do not free the node itself, this the the destructor, not
* delete.
*/
static void destructor _((stmt_ty *));
static void
destructor(sp)
stmt_ty *sp;
{
stmt_command_ty *this;
trace(("destructor(sp = %08X)\n{\n"/*}*/, sp));
/* assert(sp); */
/* assert(sp->method == &method); */
this = (stmt_command_ty *)sp;
expr_list_destructor(&this->args);
expr_list_destructor(&this->flags);
if (this->input)
expr_delete(this->input);
expr_position_destructor(&this->pos);
trace((/*{*/"}\n"));
}
/*
* NAME
* code_generate
*
* SYNOPSIS
* stmt_result_ty code_generate(stmt_ty *sp, opcode_list_ty *olp);
*
* DESCRIPTION
* The code_generate function is used to generate the opcodes for
* this statement node.
*
* RETURNS
* The value returned indicates why the code generation terminated.
*/
static stmt_result_ty code_generate _((stmt_ty *, opcode_list_ty *));
static stmt_result_ty
code_generate(sp, olp)
stmt_ty *sp;
opcode_list_ty *olp;
{
stmt_command_ty *this;
trace(("code_generate(sp = %08X)\n{\n"/*}*/, sp));
assert(sp);
this = (stmt_command_ty *)sp;
/*
* generate the command strings
*/
opcode_list_append(olp, opcode_push_new());
expr_list_code_generate(&this->args, olp);
/*
* generate the flag strings
*/
opcode_list_append(olp, opcode_push_new());
expr_list_code_generate(&this->flags, olp);
/*
* generate the command input
*/
if (this->input)
{
opcode_list_append(olp, opcode_push_new());
expr_code_generate(this->input, olp);
}
/*
* generate the command itself
*/
opcode_list_append
(
olp,
opcode_command_new((this->input != 0), &this->pos)
);
trace((/*{*/"}\n"));
return STMT_OK;
}
/*
* NAME
* method - class method table
*
* DESCRIPTION
* This is the class method table. It contains a description of
* the class, its name, size and pointers to its virtual methods.
*
* CAVEAT
* This symbol is NOT to be exported from this file scope.
*/
static stmt_method_ty method =
{
"command",
sizeof(stmt_command_ty),
destructor,
code_generate,
};
/*
* NAME
* stmt_command_new - create a new command statement node
*
* SYNOPSIS
* stmt_ty *stmt_command_new(string_ty *);
*
* DESCRIPTION
* The stmt_command_new function is used to create a new instance
* of a command statement node.
*
* RETURNS
* stmt_ty *; pointer to polymorphic statement instance.
*
* CAVEAT
* This function allocates data in dynamic memory. It is the
* caller's responsibility to free this data, using stmt_delete,
* when it is no longer required.
*/
stmt_ty *
stmt_command_new(args, flags, input, pp)
expr_list_ty *args;
expr_list_ty *flags;
expr_ty *input;
expr_position_ty *pp;
{
stmt_ty *sp;
stmt_command_ty *this;
trace(("stmt_command_new()\n{\n"/*}*/));
sp = stmt_private_new(&method);
this = (stmt_command_ty *)sp;
expr_list_copy_constructor(&this->args, args);
expr_list_copy_constructor(&this->flags, flags);
this->input = (input ? expr_copy(input) : (expr_ty *)0);
expr_position_copy_constructor(&this->pos, pp);
trace(("return %8.8lX;\n", (long)sp));
trace((/*{*/"}\n"));
return sp;
}
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