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/*
* Copyright (c) 2025 Ian Marco Moffett and L5 engineers
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions are met:
*
* 1. Redistributions of source code must retain the above copyright notice,
* this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
* 3. Neither the name of the project nor the names of its
* contributors may be used to endorse or promote products derived from
* this software without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
* AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
* ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE
* LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
* CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
* SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
* INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
* CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
* ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
* POSSIBILITY OF SUCH DAMAGE.
*/
#ifndef _NP_PIIR_H_
#define _NP_PIIR_H_
#include <sys/types.h>
#include <sys/cdefs.h>
#include <os/spinlock.h>
#include <os/np.h>
/*
* Represents two different kinds of bytes, MI IR
* bytes and MD opcode / instruction bytes, less than
* zero values are reserved for error indication.
*/
typedef int8_t ir_byte_t;
typedef int8_t md_byte_t;
/*
* The maxiumum size of the bytecode stack per
* translation unit
*/
#define PIIR_STACK_SIZE 4096
/* PIIR opcodes */
#define PIIR_NOP 0x00
#define PIIR_LOAD_R8 0x01
#define PIIR_LOAD_R16 0x02
#define PIIR_LOAD_R32 0x03
#define PIIR_LOAD_R64 0x04
#define PIIR_RET_NIL 0x05 /* Return nothing */
/*
* Represents the PIIR virtual machine for storing
* state while converting IR to instruction bytes
*
* @code: Generated machine code
* @last_ir: Last IR byte used
* @code_i: Current index into code buffer
*/
struct piir_vm {
md_byte_t code[4096];
ir_byte_t last_ir;
uint32_t code_i;
};
/*
* Represents the Pi-IR (PIIR) bytecode stack
*
* @opstore: The actual stack
* @op_head: Where new ops are written
* @op_tail: Where new ops are read
*/
struct piir_stack {
ir_byte_t opstore[PIIR_STACK_SIZE];
uint16_t op_head;
uint16_t op_tail;
struct spinlock lock;
};
/*
* Allocate a new PIIR stack
*
* @work: Current work
* @resp: Result pointer is written here
*
* Returns zero on success, otherwise a less than zero
* value on failure.
*/
int piir_stack_new(struct np_work *work, struct piir_stack **resp);
/*
* Push a byte to the IR stack
*
* @stack: Stack to push to
* @byte: Byte to push
*
* Returns zero on success, otherwise a less than zero
* value on failure.
*/
int piir_push(struct piir_stack *stack, ir_byte_t byte);
/*
* Pop a byte from the IR stack
*
* @stack: Stack to pop from
*
* Returns the byte on success, otherwise a less than
* zero value if the stack is empty
*/
int piir_pop(struct piir_stack *stack);
/*
* Inject control flow via stack machine
*
* @work: Current work
*
* Returns zero on success, otherwise a less than
* zero value on failure.
*/
int piir_inject(struct np_work *work);
#endif /* !_NP_PIIR_H_ */
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