610 lines
12 KiB
C
610 lines
12 KiB
C
/* RETRO : a personal, minimalistic forth
|
|
|
|
This interface layer will create a new binary that
|
|
bundles the RETRO virtual machine and image file.
|
|
|
|
The VM and image are embedded in this as ELF sections.
|
|
This will extract them, compile code from a file into
|
|
the image, then embed the image into the VM binary.
|
|
|
|
Due to the way this works, it requires a Unix-like OS
|
|
and the `objcopy` binary in the path.
|
|
|
|
Copyright (c) 2016 - 2019, Charles Childers
|
|
*/
|
|
|
|
#include <stdio.h>
|
|
#include <stdint.h>
|
|
#include <stdlib.h>
|
|
#include <unistd.h>
|
|
#include <string.h>
|
|
#include <sys/stat.h>
|
|
|
|
#define CELL int32_t
|
|
#define IMAGE_SIZE 524288 * 8
|
|
#define ADDRESSES 2048
|
|
#define STACK_DEPTH 512
|
|
|
|
CELL sp, rp, ip;
|
|
CELL data[STACK_DEPTH];
|
|
CELL address[ADDRESSES];
|
|
CELL memory[IMAGE_SIZE + 1];
|
|
#define TOS data[sp]
|
|
#define NOS data[sp-1]
|
|
#define TORS address[rp]
|
|
|
|
#define NUM_DEVICES 1
|
|
|
|
typedef void (*Handler)(void);
|
|
|
|
Handler IO_deviceHandlers[NUM_DEVICES + 1];
|
|
Handler IO_queryHandlers[NUM_DEVICES + 1];
|
|
|
|
CELL ngaLoadImage(char *imageFile);
|
|
void ngaPrepare();
|
|
void ngaProcessOpcode(CELL opcode);
|
|
void ngaProcessPackedOpcodes(int opcode);
|
|
int ngaValidatePackedOpcodes(CELL opcode);
|
|
|
|
/* This assumes some knowledge of the ngaImage format for the
|
|
Retro language. If things change there, these will need to
|
|
be adjusted to match. */
|
|
|
|
#define TIB 1025
|
|
#define D_OFFSET_LINK 0
|
|
#define D_OFFSET_XT 1
|
|
#define D_OFFSET_CLASS 2
|
|
#define D_OFFSET_NAME 3
|
|
|
|
extern CELL Dictionary, Heap, Compiler;
|
|
extern CELL notfound;
|
|
|
|
CELL stack_pop();
|
|
void stack_push(CELL value);
|
|
int string_inject(char *str, int buffer);
|
|
char *string_extract(int at);
|
|
int d_link(CELL dt);
|
|
int d_xt(CELL dt);
|
|
int d_class(CELL dt);
|
|
int d_name(CELL dt);
|
|
int d_lookup(CELL Dictionary, char *name);
|
|
CELL d_xt_for(char *Name, CELL Dictionary);
|
|
CELL d_class_for(char *Name, CELL Dictionary);
|
|
void update_rx();
|
|
void execute(int cell);
|
|
void evaluate(char *s);
|
|
int not_eol(int ch);
|
|
void read_token(FILE *file, char *token_buffer, int echo);
|
|
char *read_token_str(char *s, char *token_buffer, int echo);
|
|
|
|
void generic_output() {
|
|
putc(stack_pop(), stdout);
|
|
fflush(stdout);
|
|
}
|
|
|
|
void generic_output_query() {
|
|
stack_push(0);
|
|
stack_push(0);
|
|
}
|
|
|
|
void dump_stack() {
|
|
CELL i;
|
|
if (sp == 0)
|
|
return;
|
|
printf("\nStack: ");
|
|
for (i = 1; i <= sp; i++) {
|
|
if (i == sp)
|
|
printf("[ TOS: %d ]", data[i]);
|
|
else
|
|
printf("%d ", data[i]);
|
|
}
|
|
printf("\n");
|
|
}
|
|
|
|
int include_file(char *fname) {
|
|
FILE *fp;
|
|
char source[64000];
|
|
int inBlock = 0;
|
|
int tokens = 0;
|
|
fp = fopen(fname, "r");
|
|
if (fp == NULL)
|
|
return 0;
|
|
while (!feof(fp))
|
|
{
|
|
read_token(fp, source, 0);
|
|
if (strcmp(source, "~~~") == 0) {
|
|
if (inBlock == 0)
|
|
inBlock = 1;
|
|
else
|
|
inBlock = 0;
|
|
} else {
|
|
if (inBlock == 1) {
|
|
evaluate(source);
|
|
putchar('.');
|
|
}
|
|
}
|
|
tokens++;
|
|
}
|
|
fclose(fp);
|
|
putchar('\n');
|
|
return tokens;
|
|
}
|
|
|
|
void extract_runtime(char *src) {
|
|
char buffer[4096];
|
|
snprintf(buffer, 4096, "objcopy -O binary --only-section=.runtime --set-section-flags .runtime=alloc %s a.out", src);
|
|
system(buffer);
|
|
}
|
|
|
|
void extract_image(char *src) {
|
|
char buffer[4096];
|
|
snprintf(buffer, 4096, "objcopy -O binary --only-section=.ngaImage --set-section-flags .ngaImage=alloc %s __ngaImage", src);
|
|
system(buffer);
|
|
}
|
|
|
|
void generate_turnkey(void) {
|
|
system("objcopy --add-section .ngaImage=__ngaImage --set-section-flags .ngaImage=noload,readonly a.out");
|
|
chmod("a.out", 493);
|
|
}
|
|
|
|
int validate_image(int tokens) {
|
|
if (tokens == 0) {
|
|
unlink("a.out");
|
|
printf("Error: no tokens in source file!\n");
|
|
return -1;
|
|
}
|
|
if (memory[1] == 0 || memory[1] == -1) {
|
|
unlink("a.out");
|
|
printf("Error: entry point not set!\n");
|
|
return -2;
|
|
}
|
|
return 0;
|
|
}
|
|
|
|
void setup() {
|
|
IO_deviceHandlers[0] = generic_output;
|
|
IO_queryHandlers[0] = generic_output_query;
|
|
}
|
|
|
|
void write_image() {
|
|
FILE *fp;
|
|
if ((fp = fopen("__ngaImage", "wb")) == NULL) {
|
|
printf("Unable to save the ngaImage!\n");
|
|
exit(2);
|
|
}
|
|
fwrite(&memory, sizeof(CELL), memory[3] + 1, fp);
|
|
fclose(fp);
|
|
}
|
|
|
|
void patch_entry(CELL a) {
|
|
memory[1] = a;
|
|
}
|
|
|
|
int main(int argc, char **argv) {
|
|
int tokens;
|
|
if (argc < 3) {
|
|
printf("Missing arguments\n");
|
|
exit(1);
|
|
}
|
|
|
|
ngaPrepare();
|
|
extract_runtime(argv[0]);
|
|
extract_image(argv[0]);
|
|
ngaLoadImage("__ngaImage");
|
|
tokens = include_file(argv[1]);
|
|
patch_entry(d_xt_for(argv[2], Dictionary));
|
|
write_image();
|
|
generate_turnkey();
|
|
unlink("__ngaImage");
|
|
|
|
return validate_image(tokens);
|
|
}
|
|
|
|
CELL Dictionary, Heap, Compiler;
|
|
CELL notfound;
|
|
|
|
/* Some I/O Parameters */
|
|
|
|
CELL stack_pop() {
|
|
sp--;
|
|
return data[sp + 1];
|
|
}
|
|
|
|
void stack_push(CELL value) {
|
|
sp++;
|
|
data[sp] = value;
|
|
}
|
|
|
|
int string_inject(char *str, int buffer) {
|
|
int m = strlen(str);
|
|
int i = 0;
|
|
while (m > 0) {
|
|
memory[buffer + i] = (CELL)str[i];
|
|
memory[buffer + i + 1] = 0;
|
|
m--; i++;
|
|
}
|
|
return buffer;
|
|
}
|
|
|
|
char string_data[8192];
|
|
char *string_extract(int at) {
|
|
CELL starting = at;
|
|
CELL i = 0;
|
|
while(memory[starting] && i < 8192)
|
|
string_data[i++] = (char)memory[starting++];
|
|
string_data[i] = 0;
|
|
return (char *)string_data;
|
|
}
|
|
|
|
int d_xt(CELL dt) {
|
|
return dt + D_OFFSET_XT;
|
|
}
|
|
|
|
int d_name(CELL dt) {
|
|
return dt + D_OFFSET_NAME;
|
|
}
|
|
|
|
int d_lookup(CELL Dictionary, char *name) {
|
|
CELL dt = 0;
|
|
CELL i = Dictionary;
|
|
char *dname;
|
|
while (memory[i] != 0 && i != 0) {
|
|
dname = string_extract(d_name(i));
|
|
if (strcmp(dname, name) == 0) {
|
|
dt = i;
|
|
i = 0;
|
|
} else {
|
|
i = memory[i];
|
|
}
|
|
}
|
|
return dt;
|
|
}
|
|
|
|
CELL d_xt_for(char *Name, CELL Dictionary) {
|
|
return memory[d_xt(d_lookup(Dictionary, Name))];
|
|
}
|
|
|
|
/* Retro needs to track a few variables. This function is
|
|
called as necessary to ensure that the interface stays
|
|
in sync with the image state. */
|
|
|
|
void update_rx() {
|
|
Dictionary = memory[2];
|
|
Heap = memory[3];
|
|
Compiler = d_xt_for("Compiler", Dictionary);
|
|
notfound = d_xt_for("err:notfound", Dictionary);
|
|
}
|
|
|
|
|
|
/* The `execute` function runs a word in the Retro image.
|
|
It also handles the additional I/O instructions. */
|
|
|
|
void execute(int cell) {
|
|
CELL opcode;
|
|
rp = 1;
|
|
ip = cell;
|
|
while (ip < IMAGE_SIZE) {
|
|
opcode = memory[ip];
|
|
if (ngaValidatePackedOpcodes(opcode) != 0) {
|
|
ngaProcessPackedOpcodes(opcode);
|
|
} else {
|
|
printf("Invalid instruction!\n");
|
|
exit(1);
|
|
}
|
|
ip++;
|
|
if (rp == 0)
|
|
ip = IMAGE_SIZE;
|
|
}
|
|
}
|
|
|
|
/* The `evaluate` function moves a token into the Retro
|
|
token buffer, then calls the Retro `interpret` word
|
|
to process it. */
|
|
|
|
void evaluate(char *s) {
|
|
CELL interpret;
|
|
if (strlen(s) == 0)
|
|
return;
|
|
update_rx();
|
|
interpret = d_xt_for("interpret", Dictionary);
|
|
string_inject(s, TIB);
|
|
stack_push(TIB);
|
|
execute(interpret);
|
|
}
|
|
|
|
|
|
/* `read_token` reads a token from the specified file.
|
|
It will stop on a whitespace or newline. It also
|
|
tries to handle backspaces, though the success of this
|
|
depends on how your terminal is configured. */
|
|
|
|
int not_eol(int ch) {
|
|
return (ch != (char)10) && (ch != (char)13) && (ch != (char)32) && (ch != EOF) && (ch != 0);
|
|
}
|
|
|
|
void read_token(FILE *file, char *token_buffer, int echo) {
|
|
int ch, count;
|
|
ch = getc(file);
|
|
count = 0;
|
|
while (not_eol(ch))
|
|
{
|
|
if ((ch == 8 || ch == 127) && count > 0)
|
|
count--;
|
|
else
|
|
token_buffer[count++] = ch;
|
|
ch = getc(file);
|
|
}
|
|
token_buffer[count] = '\0';
|
|
}
|
|
|
|
|
|
/* Nga ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
|
|
Copyright (c) 2008 - 2018, Charles Childers
|
|
Copyright (c) 2009 - 2010, Luke Parrish
|
|
Copyright (c) 2010, Marc Simpson
|
|
Copyright (c) 2010, Jay Skeer
|
|
Copyright (c) 2011, Kenneth Keating
|
|
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ */
|
|
|
|
enum vm_opcode {
|
|
VM_NOP, VM_LIT, VM_DUP, VM_DROP, VM_SWAP, VM_PUSH, VM_POP,
|
|
VM_JUMP, VM_CALL, VM_CCALL, VM_RETURN, VM_EQ, VM_NEQ, VM_LT,
|
|
VM_GT, VM_FETCH, VM_STORE, VM_ADD, VM_SUB, VM_MUL, VM_DIVMOD,
|
|
VM_AND, VM_OR, VM_XOR, VM_SHIFT, VM_ZRET, VM_END, VM_IE,
|
|
VM_IQ, VM_II
|
|
};
|
|
#define NUM_OPS VM_II + 1
|
|
|
|
#ifndef NUM_DEVICES
|
|
#define NUM_DEVICES 0
|
|
#endif
|
|
|
|
CELL ngaLoadImage(char *imageFile) {
|
|
FILE *fp;
|
|
CELL imageSize;
|
|
long fileLen;
|
|
CELL i;
|
|
if ((fp = fopen(imageFile, "rb")) != NULL) {
|
|
/* Determine length (in cells) */
|
|
fseek(fp, 0, SEEK_END);
|
|
fileLen = ftell(fp) / sizeof(CELL);
|
|
rewind(fp);
|
|
/* Read the file into memory */
|
|
imageSize = fread(&memory, sizeof(CELL), fileLen, fp);
|
|
fclose(fp);
|
|
}
|
|
return imageSize;
|
|
}
|
|
|
|
void ngaPrepare() {
|
|
ip = sp = rp = 0;
|
|
for (ip = 0; ip < IMAGE_SIZE; ip++)
|
|
memory[ip] = VM_NOP;
|
|
for (ip = 0; ip < STACK_DEPTH; ip++)
|
|
data[ip] = 0;
|
|
for (ip = 0; ip < ADDRESSES; ip++)
|
|
address[ip] = 0;
|
|
}
|
|
|
|
void inst_nop() {
|
|
}
|
|
|
|
void inst_lit() {
|
|
sp++;
|
|
ip++;
|
|
TOS = memory[ip];
|
|
}
|
|
|
|
void inst_dup() {
|
|
sp++;
|
|
data[sp] = NOS;
|
|
}
|
|
|
|
void inst_drop() {
|
|
data[sp] = 0;
|
|
if (--sp < 0)
|
|
ip = IMAGE_SIZE;
|
|
}
|
|
|
|
void inst_swap() {
|
|
CELL a;
|
|
a = TOS;
|
|
TOS = NOS;
|
|
NOS = a;
|
|
}
|
|
|
|
void inst_push() {
|
|
rp++;
|
|
TORS = TOS;
|
|
inst_drop();
|
|
}
|
|
|
|
void inst_pop() {
|
|
sp++;
|
|
TOS = TORS;
|
|
rp--;
|
|
}
|
|
|
|
void inst_jump() {
|
|
ip = TOS - 1;
|
|
inst_drop();
|
|
}
|
|
|
|
void inst_call() {
|
|
rp++;
|
|
TORS = ip;
|
|
ip = TOS - 1;
|
|
inst_drop();
|
|
}
|
|
|
|
void inst_ccall() {
|
|
CELL a, b;
|
|
a = TOS; inst_drop(); /* False */
|
|
b = TOS; inst_drop(); /* Flag */
|
|
if (b != 0) {
|
|
rp++;
|
|
TORS = ip;
|
|
ip = a - 1;
|
|
}
|
|
}
|
|
|
|
void inst_return() {
|
|
ip = TORS;
|
|
rp--;
|
|
}
|
|
|
|
void inst_eq() {
|
|
NOS = (NOS == TOS) ? -1 : 0;
|
|
inst_drop();
|
|
}
|
|
|
|
void inst_neq() {
|
|
NOS = (NOS != TOS) ? -1 : 0;
|
|
inst_drop();
|
|
}
|
|
|
|
void inst_lt() {
|
|
NOS = (NOS < TOS) ? -1 : 0;
|
|
inst_drop();
|
|
}
|
|
|
|
void inst_gt() {
|
|
NOS = (NOS > TOS) ? -1 : 0;
|
|
inst_drop();
|
|
}
|
|
|
|
void inst_fetch() {
|
|
switch (TOS) {
|
|
case -1: TOS = sp - 1; break;
|
|
case -2: TOS = rp; break;
|
|
case -3: TOS = IMAGE_SIZE; break;
|
|
default: TOS = memory[TOS]; break;
|
|
}
|
|
}
|
|
|
|
void inst_store() {
|
|
if (TOS <= IMAGE_SIZE && TOS >= 0) {
|
|
memory[TOS] = NOS;
|
|
inst_drop();
|
|
inst_drop();
|
|
} else {
|
|
ip = IMAGE_SIZE;
|
|
}
|
|
}
|
|
|
|
void inst_add() {
|
|
NOS += TOS;
|
|
inst_drop();
|
|
}
|
|
|
|
void inst_sub() {
|
|
NOS -= TOS;
|
|
inst_drop();
|
|
}
|
|
|
|
void inst_mul() {
|
|
NOS *= TOS;
|
|
inst_drop();
|
|
}
|
|
|
|
void inst_divmod() {
|
|
CELL a, b;
|
|
a = TOS;
|
|
b = NOS;
|
|
TOS = b / a;
|
|
NOS = b % a;
|
|
}
|
|
|
|
void inst_and() {
|
|
NOS = TOS & NOS;
|
|
inst_drop();
|
|
}
|
|
|
|
void inst_or() {
|
|
NOS = TOS | NOS;
|
|
inst_drop();
|
|
}
|
|
|
|
void inst_xor() {
|
|
NOS = TOS ^ NOS;
|
|
inst_drop();
|
|
}
|
|
|
|
void inst_shift() {
|
|
CELL y = TOS;
|
|
CELL x = NOS;
|
|
if (TOS < 0)
|
|
NOS = NOS << (TOS * -1);
|
|
else {
|
|
if (x < 0 && y > 0)
|
|
NOS = x >> y | ~(~0U >> y);
|
|
else
|
|
NOS = x >> y;
|
|
}
|
|
inst_drop();
|
|
}
|
|
|
|
void inst_zret() {
|
|
if (TOS == 0) {
|
|
inst_drop();
|
|
ip = TORS;
|
|
rp--;
|
|
}
|
|
}
|
|
|
|
void inst_end() {
|
|
ip = IMAGE_SIZE;
|
|
}
|
|
|
|
void inst_ie() {
|
|
sp++;
|
|
TOS = NUM_DEVICES;
|
|
}
|
|
|
|
void inst_iq() {
|
|
CELL Device = TOS;
|
|
inst_drop();
|
|
IO_queryHandlers[Device]();
|
|
}
|
|
|
|
void inst_ii() {
|
|
CELL Device = TOS;
|
|
inst_drop();
|
|
IO_deviceHandlers[Device]();
|
|
}
|
|
|
|
Handler instructions[NUM_OPS] = {
|
|
inst_nop, inst_lit, inst_dup, inst_drop, inst_swap, inst_push, inst_pop,
|
|
inst_jump, inst_call, inst_ccall, inst_return, inst_eq, inst_neq, inst_lt,
|
|
inst_gt, inst_fetch, inst_store, inst_add, inst_sub, inst_mul, inst_divmod,
|
|
inst_and, inst_or, inst_xor, inst_shift, inst_zret, inst_end, inst_ie,
|
|
inst_iq, inst_ii
|
|
};
|
|
|
|
void ngaProcessOpcode(CELL opcode) {
|
|
if (opcode != 0)
|
|
instructions[opcode]();
|
|
}
|
|
|
|
int ngaValidatePackedOpcodes(CELL opcode) {
|
|
CELL raw = opcode;
|
|
CELL current;
|
|
int valid = -1;
|
|
int i;
|
|
for (i = 0; i < 4; i++) {
|
|
current = raw & 0xFF;
|
|
if (!(current >= 0 && current <= 29))
|
|
valid = 0;
|
|
raw = raw >> 8;
|
|
}
|
|
return valid;
|
|
}
|
|
|
|
void ngaProcessPackedOpcodes(CELL opcode) {
|
|
CELL raw = opcode;
|
|
int i;
|
|
for (i = 0; i < 4; i++) {
|
|
ngaProcessOpcode(raw & 0xFF);
|
|
raw = raw >> 8;
|
|
}
|
|
}
|