1013 lines
22 KiB
C
1013 lines
22 KiB
C
/* RETRO ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
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a personal, pragmatic, minimalistic forth
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Copyright (c) 2016, 2017 Charles Childers
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This is `rre`, short for `run retro and exit`. It's the basic
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interface layer for Retro on FreeBSD, Linux and macOS.
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rre embeds the image file into the binary, so the compiled version
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of this is all you need to have a functional system.
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~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ */
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#include <stdio.h>
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#include <stdlib.h>
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#include <unistd.h>
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#include <string.h>
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#include <math.h>
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#include <sys/types.h>
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#include <sys/stat.h>
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#include <sys/socket.h>
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#include <netinet/in.h>
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#include <netdb.h>
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#include <errno.h>
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#include <sys/wait.h>
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/* Configure Nga (the VM) Limitations */
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#define CELL int32_t
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#define IMAGE_SIZE 524288 * 16
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#define ADDRESSES 2048
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#define STACK_DEPTH 512
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/* This assumes some knowledge of the ngaImage format for the
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Retro language. If things change there, these will need to
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be adjusted to match. */
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#define TIB 1025
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#define D_OFFSET_LINK 0
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#define D_OFFSET_XT 1
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#define D_OFFSET_CLASS 2
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#define D_OFFSET_NAME 3
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/* More Nga bits. You shouldn't need to alter these */
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enum vm_opcode {
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VM_NOP, VM_LIT, VM_DUP, VM_DROP, VM_SWAP, VM_PUSH, VM_POP,
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VM_JUMP, VM_CALL, VM_CCALL, VM_RETURN, VM_EQ, VM_NEQ, VM_LT,
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VM_GT, VM_FETCH, VM_STORE, VM_ADD, VM_SUB, VM_MUL, VM_DIVMOD,
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VM_AND, VM_OR, VM_XOR, VM_SHIFT, VM_ZRET, VM_END
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};
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#define NUM_OPS VM_END + 1
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CELL sp, rp, ip;
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CELL data[STACK_DEPTH];
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CELL address[ADDRESSES];
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CELL memory[IMAGE_SIZE + 1];
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#define TOS data[sp]
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#define NOS data[sp-1]
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#define TORS address[rp]
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/* Function Prototypes */
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CELL stack_pop();
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void stack_push(CELL value);
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int string_inject(char *str, int buffer);
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char *string_extract(int at);
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int d_link(CELL dt);
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int d_xt(CELL dt);
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int d_class(CELL dt);
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int d_name(CELL dt);
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int d_lookup(CELL Dictionary, char *name);
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CELL d_xt_for(char *Name, CELL Dictionary);
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CELL d_class_for(char *Name, CELL Dictionary);
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CELL ioGetFileHandle();
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CELL ioOpenFile();
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CELL ioReadFile();
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CELL ioWriteFile();
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CELL ioCloseFile();
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CELL ioGetFilePosition();
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CELL ioSetFilePosition();
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CELL ioGetFileSize();
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CELL ioDeleteFile();
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void ioFlushFile();
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void update_rx();
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void execute(int cell);
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void evaluate(char *s);
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int not_eol(int ch);
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void read_token(FILE *file, char *token_buffer, int echo);
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char *read_token_str(char *s, char *token_buffer, int echo);
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void ngaGopherUnit();
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void ngaFloatingPointUnit();
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CELL ngaLoadImage(char *imageFile);
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void ngaPrepare();
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void ngaProcessOpcode(CELL opcode);
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void ngaProcessPackedOpcodes(int opcode);
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int ngaValidatePackedOpcodes(CELL opcode);
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CELL Dictionary, Compiler;
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CELL notfound;
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char **sys_argv;
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int sys_argc;
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/* Some I/O Parameters */
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#define MAX_OPEN_FILES 128
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#define IO_TTY_PUTC 1000
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#define IO_TTY_GETC 1001
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#define IO_FS_OPEN 118
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#define IO_FS_CLOSE 119
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#define IO_FS_READ 120
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#define IO_FS_WRITE 121
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#define IO_FS_TELL 122
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#define IO_FS_SEEK 123
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#define IO_FS_SIZE 124
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#define IO_FS_DELETE 125
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#define IO_FS_FLUSH 126
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/* First, a couple of functions to simplify interacting with
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the stack. */
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CELL stack_pop() {
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sp--;
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return data[sp + 1];
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}
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void stack_push(CELL value) {
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sp++;
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data[sp] = value;
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}
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/* Next, functions to translate C strings to/from Retro
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strings. */
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int string_inject(char *str, int buffer) {
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int m = strlen(str);
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int i = 0;
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while (m > 0) {
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memory[buffer + i] = (CELL)str[i];
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memory[buffer + i + 1] = 0;
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m--; i++;
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}
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return buffer;
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}
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char string_data[8192];
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char *string_extract(int at) {
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CELL starting = at;
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CELL i = 0;
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while(memory[starting] && i < 8192)
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string_data[i++] = (char)memory[starting++];
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string_data[i] = 0;
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return (char *)string_data;
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}
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int d_link(CELL dt) {
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return dt + D_OFFSET_LINK;
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}
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int d_xt(CELL dt) {
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return dt + D_OFFSET_XT;
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}
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int d_class(CELL dt) {
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return dt + D_OFFSET_CLASS;
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}
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int d_name(CELL dt) {
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return dt + D_OFFSET_NAME;
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}
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/* With the dictionary accessors, some functions to actually
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lookup headers. */
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int d_lookup(CELL Dictionary, char *name) {
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CELL dt = 0;
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CELL i = Dictionary;
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char *dname;
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while (memory[i] != 0 && i != 0) {
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dname = string_extract(d_name(i));
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if (strcmp(dname, name) == 0) {
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dt = i;
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i = 0;
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} else {
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i = memory[i];
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}
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}
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return dt;
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}
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CELL d_xt_for(char *Name, CELL Dictionary) {
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return memory[d_xt(d_lookup(Dictionary, Name))];
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}
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CELL d_class_for(char *Name, CELL Dictionary) {
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return memory[d_class(d_lookup(Dictionary, Name))];
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}
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/* Now for File I/O functions. These were adapted from the Ngaro VM. */
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FILE *ioFileHandles[MAX_OPEN_FILES];
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CELL ioGetFileHandle() {
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CELL i;
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for(i = 1; i < MAX_OPEN_FILES; i++)
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if (ioFileHandles[i] == 0)
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return i;
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return 0;
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}
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CELL ioOpenFile() {
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CELL slot, mode, name;
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slot = ioGetFileHandle();
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mode = data[sp]; sp--;
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name = data[sp]; sp--;
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char *request = string_extract(name);
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if (slot > 0) {
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if (mode == 0) ioFileHandles[slot] = fopen(request, "rb");
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if (mode == 1) ioFileHandles[slot] = fopen(request, "w");
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if (mode == 2) ioFileHandles[slot] = fopen(request, "a");
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if (mode == 3) ioFileHandles[slot] = fopen(request, "rb+");
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}
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if (ioFileHandles[slot] == NULL) {
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ioFileHandles[slot] = 0;
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slot = 0;
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}
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stack_push(slot);
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return slot;
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}
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CELL ioReadFile() {
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CELL slot = stack_pop();
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CELL c = fgetc(ioFileHandles[slot]);
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return feof(ioFileHandles[slot]) ? 0 : c;
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}
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CELL ioWriteFile() {
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CELL slot, c, r;
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slot = data[sp]; sp--;
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c = data[sp]; sp--;
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r = fputc(c, ioFileHandles[slot]);
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return (r == EOF) ? 0 : 1;
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}
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CELL ioCloseFile() {
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fclose(ioFileHandles[data[sp]]);
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ioFileHandles[data[sp]] = 0;
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sp--;
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return 0;
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}
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CELL ioGetFilePosition() {
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CELL slot = data[sp]; sp--;
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return (CELL) ftell(ioFileHandles[slot]);
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}
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CELL ioSetFilePosition() {
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CELL slot, pos, r;
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slot = data[sp]; sp--;
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pos = data[sp]; sp--;
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r = fseek(ioFileHandles[slot], pos, SEEK_SET);
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return r;
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}
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CELL ioGetFileSize() {
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CELL slot, current, r, size;
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slot = data[sp]; sp--;
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struct stat buffer;
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int status;
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status = fstat(fileno(ioFileHandles[slot]), &buffer);
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if (!S_ISDIR(buffer.st_mode)) {
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current = ftell(ioFileHandles[slot]);
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r = fseek(ioFileHandles[slot], 0, SEEK_END);
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size = ftell(ioFileHandles[slot]);
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fseek(ioFileHandles[slot], current, SEEK_SET);
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} else {
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r = -1;
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}
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return (r == 0) ? size : 0;
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}
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CELL ioDeleteFile() {
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CELL name = data[sp]; sp--;
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char *request = string_extract(name);
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return (unlink(request) == 0) ? -1 : 0;
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}
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void ioFlushFile() {
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CELL slot;
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slot = data[sp]; sp--;
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fflush(ioFileHandles[slot]);
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}
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/* Retro needs to track a few variables. This function is
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called as necessary to ensure that the interface stays
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in sync with the image state. */
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void update_rx() {
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Dictionary = memory[2];
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Compiler = d_xt_for("Compiler", Dictionary);
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notfound = d_xt_for("err:notfound", Dictionary);
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}
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/* The `execute` function runs a word in the Retro image.
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It also handles the additional I/O instructions. */
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#define UNIX_SYSTEM -8000
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#define UNIX_FORK -8001
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#define UNIX_EXIT -8002
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#define UNIX_GETPID -8003
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#define UNIX_EXEC0 -8004
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#define UNIX_EXEC1 -8005
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#define UNIX_EXEC2 -8006
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#define UNIX_EXEC3 -8007
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#define UNIX_WAIT -8008
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void execute(int cell) {
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CELL a, b;
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CELL opcode;
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char path[1024];
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char arg0[1024], arg1[1024], arg2[1024];
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char arg3[1024], arg4[1024], arg5[1024];
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rp = 1;
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ip = cell;
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while (ip < IMAGE_SIZE) {
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if (ip == notfound) {
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printf("%s ?\n", string_extract(TIB));
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}
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opcode = memory[ip];
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if (ngaValidatePackedOpcodes(opcode) != 0) {
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ngaProcessPackedOpcodes(opcode);
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} else if (opcode >= 0 && opcode < 27) {
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ngaProcessOpcode(opcode);
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} else {
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switch (opcode) {
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case IO_TTY_PUTC: putc(stack_pop(), stdout); fflush(stdout); break;
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case IO_TTY_GETC: stack_push(getc(stdin)); break;
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case IO_FS_OPEN: ioOpenFile(); break;
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case IO_FS_CLOSE: ioCloseFile(); break;
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case IO_FS_READ: stack_push(ioReadFile()); break;
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case IO_FS_WRITE: ioWriteFile(); break;
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case IO_FS_TELL: stack_push(ioGetFilePosition()); break;
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case IO_FS_SEEK: ioSetFilePosition(); break;
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case IO_FS_SIZE: stack_push(ioGetFileSize()); break;
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case IO_FS_DELETE: ioDeleteFile(); break;
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case IO_FS_FLUSH: ioFlushFile(); break;
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case -6000: ngaFloatingPointUnit(); break;
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case -6100: stack_push(sys_argc - 2); break;
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case -6101: a = stack_pop();
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b = stack_pop();
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stack_push(string_inject(sys_argv[a + 2], b));
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break;
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case -6200: ngaGopherUnit(); break;
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case UNIX_SYSTEM: system(string_extract(stack_pop())); break;
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case UNIX_FORK: stack_push(fork()); break;
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case UNIX_EXEC0: strcpy(path, string_extract(stack_pop()));
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execl(path, path, (char *)0);
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stack_push(errno); break;
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case UNIX_EXEC1: strcpy(arg0, string_extract(stack_pop()));
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strcpy(path, string_extract(stack_pop()));
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execl(path, path, arg0, (char *)0);
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stack_push(errno); break;
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case UNIX_EXEC2: strcpy(arg1, string_extract(stack_pop()));
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strcpy(arg0, string_extract(stack_pop()));
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strcpy(path, string_extract(stack_pop()));
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execl(path, path, arg0, arg1, (char *)0);
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stack_push(errno); break;
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case UNIX_EXEC3: strcpy(arg2, string_extract(stack_pop()));
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strcpy(arg1, string_extract(stack_pop()));
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strcpy(arg0, string_extract(stack_pop()));
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strcpy(path, string_extract(stack_pop()));
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execl(path, path, arg0, arg1, arg2, (char *)0);
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stack_push(errno); break;
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case UNIX_EXIT: exit(stack_pop()); break;
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case UNIX_GETPID: stack_push(getpid()); break;
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case UNIX_WAIT: stack_push(wait(&a)); break;
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default: printf("Invalid instruction!\n");
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printf("At %d, opcode %d\n", ip, opcode);
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exit(1);
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}
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}
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ip++;
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if (rp == 0)
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ip = IMAGE_SIZE;
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}
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}
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/* The `evaluate` function moves a token into the Retro
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token buffer, then calls the Retro `interpret` word
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to process it. */
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void evaluate(char *s) {
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if (strlen(s) == 0)
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return;
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update_rx();
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CELL interpret = d_xt_for("interpret", Dictionary);
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string_inject(s, TIB);
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stack_push(TIB);
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execute(interpret);
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}
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/* `read_token` reads a token from the specified file.
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It will stop on a whitespace or newline. It also
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tries to handle backspaces, though the success of this
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depends on how your terminal is configured. */
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int not_eol(int ch) {
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return (ch != (char)10) && (ch != (char)13) && (ch != (char)32) && (ch != EOF) && (ch != 0);
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}
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void read_token(FILE *file, char *token_buffer, int echo) {
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int ch = getc(file);
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if (echo != 0)
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putchar(ch);
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int count = 0;
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while (not_eol(ch))
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{
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if ((ch == 8 || ch == 127) && count > 0) {
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count--;
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if (echo != 0) {
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putchar(8);
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putchar(32);
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putchar(8);
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}
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} else {
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token_buffer[count++] = ch;
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}
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ch = getc(file);
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if (echo != 0)
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putchar(ch);
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}
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token_buffer[count] = '\0';
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}
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char *read_token_str(char *s, char *token_buffer, int echo) {
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int ch = (char)*s++;
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if (echo != 0)
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putchar(ch);
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int count = 0;
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while (not_eol(ch))
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{
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if ((ch == 8 || ch == 127) && count > 0) {
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count--;
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if (echo != 0) {
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putchar(8);
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putchar(32);
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putchar(8);
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}
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} else {
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token_buffer[count++] = ch;
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}
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ch = (char)*s++;
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if (echo != 0)
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putchar(ch);
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}
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token_buffer[count] = '\0';
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return s;
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}
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double Floats[8192];
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CELL fsp;
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void float_push(double value) {
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fsp++;
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Floats[fsp] = value;
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}
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double float_pop() {
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fsp--;
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return Floats[fsp + 1];
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}
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void float_from_number() {
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float_push((double)stack_pop());
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}
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void float_from_string() {
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double a = atof(string_extract(stack_pop()));
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float_push(a);
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}
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void float_to_string() {
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snprintf(string_data, 8192, "%f", float_pop());
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string_inject(string_data, stack_pop());
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}
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void float_add() {
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double a = float_pop();
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double b = float_pop();
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float_push(a+b);
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}
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void float_sub() {
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double a = float_pop();
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double b = float_pop();
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float_push(b-a);
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}
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void float_mul() {
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double a = float_pop();
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double b = float_pop();
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float_push(a*b);
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}
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void float_div() {
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double a = float_pop();
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double b = float_pop();
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float_push(b/a);
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}
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void float_floor() {
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double a = float_pop();
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float_push(floor(a));
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}
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void float_eq() {
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double a = float_pop();
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double b = float_pop();
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if (a == b)
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stack_push(-1);
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else
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stack_push(0);
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}
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void float_neq() {
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double a = float_pop();
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double b = float_pop();
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if (a != b)
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stack_push(-1);
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else
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stack_push(0);
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}
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|
|
|
void float_lt() {
|
|
double a = float_pop();
|
|
double b = float_pop();
|
|
if (b < a)
|
|
stack_push(-1);
|
|
else
|
|
stack_push(0);
|
|
}
|
|
|
|
void float_gt() {
|
|
double a = float_pop();
|
|
double b = float_pop();
|
|
if (b > a)
|
|
stack_push(-1);
|
|
else
|
|
stack_push(0);
|
|
}
|
|
|
|
void float_depth() {
|
|
stack_push(fsp);
|
|
}
|
|
|
|
void float_dup() {
|
|
double a = float_pop();
|
|
float_push(a);
|
|
float_push(a);
|
|
}
|
|
|
|
void float_drop() {
|
|
float_pop();
|
|
}
|
|
|
|
void float_swap() {
|
|
double a = float_pop();
|
|
double b = float_pop();
|
|
float_push(a);
|
|
float_push(b);
|
|
}
|
|
|
|
void float_log() {
|
|
double a = float_pop();
|
|
double b = float_pop();
|
|
float_push(log(b) / log(a));
|
|
}
|
|
|
|
void float_pow() {
|
|
double a = float_pop();
|
|
double b = float_pop();
|
|
float_push(pow(b, a));
|
|
}
|
|
|
|
void float_to_number() {
|
|
double a = float_pop();
|
|
if (a > 2147483647)
|
|
a = 2147483647;
|
|
if (a < -2147483648)
|
|
a = -2147483648;
|
|
a = round(a);
|
|
stack_push((CELL)a);
|
|
}
|
|
|
|
void ngaFloatingPointUnit() {
|
|
switch (stack_pop()) {
|
|
case 0: float_from_number();
|
|
break;
|
|
case 1: float_from_string();
|
|
break;
|
|
case 2: float_to_string();
|
|
break;
|
|
case 3: float_add();
|
|
break;
|
|
case 4: float_sub();
|
|
break;
|
|
case 5: float_mul();
|
|
break;
|
|
case 6: float_div();
|
|
break;
|
|
case 7: float_floor();
|
|
break;
|
|
case 8: float_eq();
|
|
break;
|
|
case 9: float_neq();
|
|
break;
|
|
case 10: float_lt();
|
|
break;
|
|
case 11: float_gt();
|
|
break;
|
|
case 12: float_depth();
|
|
break;
|
|
case 13: float_dup();
|
|
break;
|
|
case 14: float_drop();
|
|
break;
|
|
case 15: float_swap();
|
|
break;
|
|
case 16: float_log();
|
|
break;
|
|
case 17: float_pow();
|
|
break;
|
|
case 18: float_to_number();
|
|
break;
|
|
default: ;
|
|
}
|
|
}
|
|
|
|
void error(const char *msg) {
|
|
perror(msg);
|
|
exit(0);
|
|
}
|
|
|
|
void gopher_fetch(char *host, CELL port, char *selector, CELL dest) {
|
|
int sockfd, portno, n;
|
|
struct sockaddr_in serv_addr;
|
|
struct hostent *server;
|
|
char data[128 * 1024 + 1];
|
|
char buffer[1025];
|
|
portno = (int)port;
|
|
sockfd = socket(AF_INET, SOCK_STREAM, 0);
|
|
if (sockfd < 0)
|
|
error("ERROR opening socket");
|
|
server = gethostbyname(host);
|
|
if (server == NULL) {
|
|
fprintf(stderr,"ERROR, no such host\n");
|
|
exit(0);
|
|
}
|
|
bzero(data, 128 * 1024 + 1);
|
|
bzero((char *) &serv_addr, sizeof(serv_addr));
|
|
serv_addr.sin_family = AF_INET;
|
|
bcopy((char *)server->h_addr,
|
|
(char *)&serv_addr.sin_addr.s_addr,
|
|
server->h_length);
|
|
serv_addr.sin_port = htons(portno);
|
|
if (connect(sockfd,(struct sockaddr *) &serv_addr,sizeof(serv_addr)) < 0)
|
|
error("ERROR connecting");
|
|
n = write(sockfd,selector,strlen(selector));
|
|
if (n < 0)
|
|
error("ERROR writing to socket");
|
|
n = write(sockfd,"\n",strlen("\n"));
|
|
if (n < 0)
|
|
error("ERROR writing to socket");
|
|
n = 1;
|
|
while (n > 0) {
|
|
bzero(buffer,1025);
|
|
n = read(sockfd,buffer,1024);
|
|
strcat(data, buffer);
|
|
}
|
|
close(sockfd);
|
|
string_inject(data, dest);
|
|
stack_push(strlen(data));
|
|
}
|
|
|
|
|
|
/* <addr> <server> <port> <selector> */
|
|
void ngaGopherUnit() {
|
|
char server[1025];
|
|
char selector[4097];
|
|
CELL port, dest;
|
|
strcpy(selector, string_extract(stack_pop()));
|
|
port = stack_pop();
|
|
strcpy(server, string_extract(stack_pop()));
|
|
dest = stack_pop();
|
|
gopher_fetch(server, port, selector, dest);
|
|
}
|
|
|
|
/* Compile image.c and link against the image.o */
|
|
#include "image.c"
|
|
|
|
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 fenced(char *s)
|
|
{
|
|
int a = strcmp(s, "```");
|
|
int b = strcmp(s, "~~~");
|
|
if (a == 0) return 1;
|
|
if (b == 0) return 1;
|
|
return 0;
|
|
}
|
|
|
|
|
|
void include_file(char *fname) {
|
|
int inBlock = 0;
|
|
char source[64 * 1024];
|
|
char fence[4];
|
|
FILE *fp;
|
|
fp = fopen(fname, "r");
|
|
if (fp == NULL)
|
|
return;
|
|
while (!feof(fp))
|
|
{
|
|
read_token(fp, source, 0);
|
|
strncpy(fence, source, 3);
|
|
fence[3] = '\0';
|
|
if (fenced(fence)) {
|
|
if (inBlock == 0)
|
|
inBlock = 1;
|
|
else
|
|
inBlock = 0;
|
|
} else {
|
|
if (inBlock == 1)
|
|
evaluate(source);
|
|
}
|
|
}
|
|
fclose(fp);
|
|
}
|
|
|
|
|
|
int main(int argc, char **argv) {
|
|
int i;
|
|
ngaPrepare();
|
|
for (i = 0; i < ngaImageCells; i++)
|
|
memory[i] = ngaImage[i];
|
|
update_rx();
|
|
|
|
sys_argc = argc;
|
|
sys_argv = argv;
|
|
|
|
include_file(argv[1]);
|
|
|
|
if (sp >= 1)
|
|
dump_stack();
|
|
|
|
exit(0);
|
|
}
|
|
|
|
/* Nga ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
|
|
Copyright (c) 2008 - 2017, Charles Childers
|
|
Copyright (c) 2009 - 2010, Luke Parrish
|
|
Copyright (c) 2010, Marc Simpson
|
|
Copyright (c) 2010, Jay Skeer
|
|
Copyright (c) 2011, Kenneth Keating
|
|
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ */
|
|
|
|
CELL ngaLoadImage(char *imageFile) {
|
|
FILE *fp;
|
|
CELL imageSize;
|
|
long fileLen;
|
|
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);
|
|
}
|
|
else {
|
|
printf("Unable to find the ngaImage!\n");
|
|
exit(1);
|
|
}
|
|
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() {
|
|
int 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() {
|
|
int 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() {
|
|
memory[TOS] = NOS;
|
|
inst_drop();
|
|
inst_drop();
|
|
}
|
|
|
|
void inst_add() {
|
|
NOS += TOS;
|
|
inst_drop();
|
|
}
|
|
|
|
void inst_sub() {
|
|
NOS -= TOS;
|
|
inst_drop();
|
|
}
|
|
|
|
void inst_mul() {
|
|
NOS *= TOS;
|
|
inst_drop();
|
|
}
|
|
|
|
void inst_divmod() {
|
|
int 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;
|
|
}
|
|
|
|
typedef void (*Handler)(void);
|
|
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
|
|
};
|
|
|
|
void ngaProcessOpcode(CELL opcode) {
|
|
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 <= 26))
|
|
valid = 0;
|
|
raw = raw >> 8;
|
|
}
|
|
return valid;
|
|
}
|
|
|
|
void ngaProcessPackedOpcodes(int opcode) {
|
|
CELL raw = opcode;
|
|
int i;
|
|
for (i = 0; i < 4; i++) {
|
|
ngaProcessOpcode(raw & 0xFF);
|
|
raw = raw >> 8;
|
|
}
|
|
}
|