mud/fluffos-2.23-ds03/disassembler.c
2020-09-06 05:43:07 -07:00

697 lines
21 KiB
C

/*
* Dump information about a program, optionally disassembling it.
*/
#include "std.h"
#include "lpc_incl.h"
#include "efuns_incl.h"
#include "simul_efun.h"
#include "comm.h"
#include "lex.h"
#include "file.h"
#include "program.h"
#ifdef F_DUMP_PROG
void dump_prog (program_t *, const char *, int);
static void disassemble (FILE *, char *, int, int, program_t *);
static const char *disassem_string (const char *);
static int CDECL short_compare (CONST void *, CONST void *);
static void dump_line_numbers (FILE *, program_t *);
void
f_dump_prog (void)
{
program_t *prog;
const char *where;
int d;
object_t *ob;
int narg = st_num_arg;
if (st_num_arg == 2) {
ob = sp[-1].u.ob;
d = sp->u.number;
where = 0;
} else if (st_num_arg == 3) {
ob = sp[-2].u.ob;
d = sp[-1].u.number;
where = (sp->type == T_STRING) ? sp->u.string : 0;
} else {
ob = sp->u.ob;
d = 0;
where = 0;
}
if (!(prog = ob->prog)) {
error("No program for object.\n");
} else {
if (!where) {
where = "/PROG_DUMP";
}
dump_prog(prog, where, d);
}
pop_n_elems(narg);
}
/* Current flags:
* 1 - do disassembly
* 2 - dump line number table
*/
void
dump_prog (program_t * prog, const char * fn, int flags)
{
const char *fname;
FILE *f;
int i, j;
int num_funcs_total;
fname = check_valid_path(fn, current_object, "dumpallobj", 1);
if (!fname) {
error("Invalid path '%s' for writing.\n", fn);
return;
}
f = fopen(fname, "w");
if (!f) {
error("Unable to open '/%s' for writing.\n", fname);
return;
}
fprintf(f, "NAME: /%s\n", prog->filename);
fprintf(f, "INHERITS:\n");
fprintf(f, "\tname fio vio\n");
fprintf(f, "\t---------------- --- ---\n");
for (i = 0; i < prog->num_inherited; i++)
fprintf(f, "\t%-20s %5d %5d\n",
prog->inherit[i].prog->filename,
prog->inherit[i].function_index_offset,
prog->inherit[i].variable_index_offset
);
fprintf(f, "PROGRAM:");
for (i = 0; i < prog->program_size; i++) {
if (i % 16 == 0)
fprintf(f, "\n\t%04x: ", (unsigned int) i);
fprintf(f, "%02d ", (unsigned char) prog->program[i]);
}
fputc('\n', f);
fprintf(f, "FUNCTIONS:\n");
fprintf(f, " name offset flags fio # locals # args\n");
fprintf(f, " --------------------- ------ ------- --- -------- ------\n");
num_funcs_total = prog->last_inherited + prog->num_functions_defined;
for (i = 0; i < num_funcs_total; i++) {
char sflags[8];
int flags;
int runtime_index;
function_t *func_entry = find_func_entry(prog, i);
register int low, high, mid;
flags = prog->function_flags[i];
if (flags & FUNC_ALIAS) {
runtime_index = flags & ~FUNC_ALIAS;
sflags[4] = 'a';
}
else {
runtime_index = i;
sflags[4] = '-';
}
flags = prog->function_flags[runtime_index];
sflags[0] = (flags & FUNC_INHERITED) ? 'i' : '-';
sflags[1] = (flags & FUNC_UNDEFINED) ? 'u' : '-';
sflags[2] = (flags & FUNC_STRICT_TYPES) ? 's' : '-';
sflags[3] = (flags & FUNC_PROTOTYPE) ? 'p' : '-';
sflags[5] = (flags & FUNC_TRUE_VARARGS) ? 'V' : '-';
sflags[6] = (flags & FUNC_VARARGS) ? 'v' : '-';
sflags[7] = '\0';
if (flags & FUNC_INHERITED) {
low = 0;
high = prog->num_inherited - 1;
while (high > low) {
mid = (low + high + 1)/2;
if (prog->inherit[mid].function_index_offset > runtime_index)
high = mid -1;
else low = mid;
}
fprintf(f, "%4d: %-20s %5d %7s %5d\n",
i, func_entry->funcname,
low,
sflags,
runtime_index - prog->inherit[low].function_index_offset);
} else {
fprintf(f, "%4d: %-20s %5d %7s %7d %5d\n",
i, func_entry->funcname,
runtime_index - prog->last_inherited
,sflags,
func_entry->num_arg,
func_entry->num_local);
}
}
fprintf(f, "VARIABLES:\n");
for (i = 0; i < prog->num_variables_defined; i++)
fprintf(f, "%4d: %-12s\n", i,
prog->variable_table[i]);
fprintf(f, "STRINGS:\n");
for (i = 0; i < prog->num_strings; i++) {
fprintf(f, "%4d: ", i);
for (j = 0; j < 32; j++) {
char c;
if (!(c = prog->strings[i][j]))
break;
else if (c == '\n')
fprintf(f, "\\n");
else
fputc(c, f);
}
fputc('\n', f);
}
if (flags & 1) {
fprintf(f, "\n;;; *** Disassembly ***\n");
disassemble(f, prog->program, 0, prog->program_size, prog);
}
if (flags & 2) {
fprintf(f, "\n;;; *** Line Number Info ***\n");
dump_line_numbers(f, prog);
}
fclose(f);
}
static const char *disassem_string (const char * str)
{
static char buf[30];
char *b;
int i;
if (!str)
return "0";
b = buf;
for (i = 0; i < 29; i++) {
if (!str[i])
break;
if (str[i] == '\n') {
*b++ = '\\';
*b++ = 'n';
} else {
*b++ = str[i];
}
}
*b++ = 0;
return buf;
}
#define NUM_FUNS (prog->num_functions_defined + prog->last_inherited)
#define NUM_FUNS_D prog->num_functions_defined
#define VARS prog->variable_names
#define NUM_VARS prog->num_variables_total
#define STRS prog->strings
#define NUM_STRS prog->num_strings
#define CLSS prog->classes
static int CDECL
short_compare (CONST void * a, CONST void * b)
{
int x = *(unsigned short *)a;
int y = *(unsigned short *)b;
return x - y;
}
static const char *pushes[] = { "string", "number", "global", "local" };
static void
disassemble (FILE * f, char * code, int start, int end, program_t * prog)
{
extern int num_simul_efun;
long i, j, instr, iarg, is_efun, ri;
unsigned short sarg;
unsigned short offset;
char *pc, buff[2048];
int next_func;
short *offsets;
if (start == 0) {
/* sort offsets of functions */
offsets = (short *) malloc(NUM_FUNS_D * 2 * sizeof(short));
for (i = 0; i < NUM_FUNS_D; i++) {
ri = i + prog->last_inherited;
if (prog->function_flags[ri] & FUNC_NO_CODE) {
offsets[i << 1] = end + 1;
}
else {
offsets[i << 1] = prog->function_table[i].address;
}
offsets[(i << 1) + 1] = i;
}
#ifdef _SEQUENT_
qsort((void *) &offsets[0],
#else
qsort((char *) &offsets[0],
#endif
NUM_FUNS_D, sizeof(short) * 2, short_compare);
next_func = 0;
} else {
offsets = 0;
next_func = -1;
}
pc = code + start;
while ((pc - code) < end) {
if ((next_func >= 0) && ((pc - code) >= offsets[next_func])) {
fprintf(f, "\n;; Function %s\n", prog->function_table[offsets[next_func + 1]].funcname);
next_func += 2;
if (next_func >= ( NUM_FUNS_D * 2))
next_func = -1;
}
fprintf(f, "%04x: ", (unsigned) (pc - code));
is_efun = (instr = EXTRACT_UCHAR(pc)) >= BASE;
pc++;
buff[0] = 0;
sarg = 0;
switch (instr) {
case F_PUSH:
fprintf(f, "push ");
i = EXTRACT_UCHAR(pc++);
while (i--) {
j = EXTRACT_UCHAR(pc++);
fprintf(f, "%s %ld", pushes[(j & PUSH_WHAT) >> 6],
j & PUSH_MASK);
if (i)
fprintf(f, ", ");
else break;
}
fprintf(f, "\n");
continue;
/* Single numeric arg */
case F_BRANCH_NE:
case F_BRANCH_GE:
case F_BRANCH_LE:
case F_BRANCH_EQ:
case F_BRANCH:
case F_BRANCH_WHEN_ZERO:
case F_BRANCH_WHEN_NON_ZERO:
#ifdef F_LOR
case F_LOR:
case F_LAND:
#endif
COPY_SHORT(&sarg, pc);
offset = (pc - code) + (unsigned short) sarg;
sprintf(buff, "%04x (%04x)", (unsigned) sarg, (unsigned) offset);
pc += 2;
break;
case F_NEXT_FOREACH:
case F_BBRANCH_LT:
COPY_SHORT(&sarg, pc);
offset = (pc - code) - (unsigned short) sarg;
sprintf(buff, "%04x (%04x)", (unsigned) sarg, (unsigned) offset);
pc += 2;
break;
case F_FOREACH:
{
int flags = EXTRACT_UCHAR(pc++);
const char *left = "local", *right = "local";
if (flags & FOREACH_LEFT_GLOBAL)
left = "global";
if (flags & FOREACH_RIGHT_GLOBAL)
right = "global";
if (flags & FOREACH_REF) {
if (flags & FOREACH_MAPPING)
right = "ref";
else
left = "ref";
}
if (flags & FOREACH_MAPPING) {
char *tmp = pc++;
sprintf(buff, "(mapping) %s %i, %s %i",
left, EXTRACT_UCHAR(tmp), right, EXTRACT_UCHAR(pc++));
} else {
sprintf(buff, "(array) %s %i", left, EXTRACT_UCHAR(pc++));
}
break;
}
case F_BBRANCH_WHEN_ZERO:
case F_BBRANCH_WHEN_NON_ZERO:
case F_BBRANCH:
COPY_SHORT(&sarg, pc);
offset = (pc - code) - (unsigned short) sarg;
sprintf(buff, "%04x (%04x)", (unsigned) sarg, (unsigned) offset);
pc += 2;
break;
#ifdef F_JUMP
case F_JUMP:
#endif
#ifdef F_JUMP_WHEN_ZERO
case F_JUMP_WHEN_ZERO:
case F_JUMP_WHEN_NON_ZERO:
#endif
case F_CATCH:
COPY_SHORT(&sarg, pc);
sprintf(buff, "%04x", (unsigned) sarg);
pc += 2;
break;
case F_AGGREGATE:
case F_AGGREGATE_ASSOC:
COPY_SHORT(&sarg, pc);
sprintf(buff, "%d", sarg);
pc += 2;
break;
case F_MAKE_REF:
case F_KILL_REFS:
case F_MEMBER:
case F_MEMBER_LVALUE:
sprintf(buff, "%d", EXTRACT_UCHAR(pc++));
break;
case F_EXPAND_VARARGS:
{
int which = EXTRACT_UCHAR(pc++);
if (which) {
sprintf(buff, "%d from top of stack", which);
} else {
strcpy(buff, "top of stack");
}
}
break;
case F_NEW_EMPTY_CLASS:
case F_NEW_CLASS:
{
int which = EXTRACT_UCHAR(pc++);
strcpy(buff, STRS[CLSS[which].classname]);
break;
}
case F_CALL_FUNCTION_BY_ADDRESS:
COPY_SHORT(&sarg, pc);
pc += 3;
if (sarg < NUM_FUNS)
sprintf(buff, "%-12s %5d", function_name(prog, sarg),
sarg);
else
sprintf(buff, "<out of range %d>", sarg);
break;
case F_CALL_INHERITED:
{
program_t *newprog;
newprog = (prog->inherit + EXTRACT_UCHAR(pc++))->prog;
COPY_SHORT(&sarg, pc);
pc += 3;
if (sarg < (newprog->num_functions_defined +
newprog->last_inherited))
sprintf(buff, "%30s::%-12s %5d", newprog->filename,
function_name(newprog, sarg), sarg);
else sprintf(buff, "<out of range in %30s - %d>", newprog->filename,
sarg);
break;
}
case F_GLOBAL_LVALUE:
case F_GLOBAL:
if ((unsigned) (iarg = EXTRACT_UCHAR(pc)) < NUM_VARS)
sprintf(buff, "%s", variable_name(prog, iarg));
else
sprintf(buff, "<out of range %ld>", iarg);
pc++;
break;
case F_LOOP_INCR:
sprintf(buff, "LV%d", EXTRACT_UCHAR(pc));
pc++;
break;
case F_WHILE_DEC:
COPY_SHORT(&sarg, pc + 1);
offset = (pc - code) - (unsigned short) sarg;
sprintf(buff, "LV%d--, branch %04x (%04x)", EXTRACT_UCHAR(pc),
(unsigned) sarg, (unsigned) offset);
pc += 3;
break;
case F_TRANSFER_LOCAL:
case F_LOCAL:
case F_LOCAL_LVALUE:
case F_VOID_ASSIGN_LOCAL:
case F_REF:
case F_REF_LVALUE:
sprintf(buff, "LV%d", EXTRACT_UCHAR(pc));
pc++;
break;
case F_LOOP_COND_NUMBER:
i = EXTRACT_UCHAR(pc++);
COPY_INT(&iarg, pc);
pc += 4;
COPY_SHORT(&sarg, pc);
offset = (pc - code) - (unsigned short) sarg;
pc += 2;
sprintf(buff, "LV%ld < %ld bbranch_when_non_zero %04x (%04x)",
i, iarg, sarg, offset);
break;
case F_LOOP_COND_LOCAL:
i = EXTRACT_UCHAR(pc++);
iarg = *pc++;
COPY_SHORT(&sarg, pc);
offset = (pc - code) - (unsigned short) sarg;
pc += 2;
sprintf(buff, "LV%ld < LV%ld bbranch_when_non_zero %04x (%04x)",
i, iarg, sarg, offset);
break;
case F_STRING:
COPY_SHORT(&sarg, pc);
if (sarg < NUM_STRS)
sprintf(buff, "\"%s\"", disassem_string(STRS[sarg]));
else
sprintf(buff, "<out of range %d>", sarg);
pc += 2;
break;
case F_SHORT_STRING:
if (EXTRACT_UCHAR(pc) < NUM_STRS)
sprintf(buff, "\"%s\"", disassem_string(STRS[EXTRACT_UCHAR(pc)]));
else
sprintf(buff, "<out of range %d>", EXTRACT_UCHAR(pc));
pc++;
break;
case F_SIMUL_EFUN:
COPY_SHORT(&sarg, pc);
if (sarg >= num_simul_efun)
sprintf(buff, "<invalid %d> %d\n", sarg, pc[2]);
else
sprintf(buff, "\"%s\" %d", simuls[sarg].func->funcname, pc[2]);
pc += 3;
break;
case F_FUNCTION_CONSTRUCTOR:
switch (EXTRACT_UCHAR(pc++)) {
case FP_SIMUL:
LOAD_SHORT(sarg, pc);
sprintf(buff, "<simul_efun> \"%s\"", simuls[sarg].func->funcname);
break;
case FP_EFUN:
LOAD_SHORT(sarg, pc);
sprintf(buff, "<efun> %s", instrs[sarg].name);
break;
case FP_LOCAL:
LOAD_SHORT(sarg, pc);
if (sarg < NUM_FUNS)
sprintf(buff, "<local_fun> %s", function_name(prog, sarg));
else
sprintf(buff, "<local_fun> <out of range %d>", sarg);
break;
case FP_FUNCTIONAL:
case FP_FUNCTIONAL | FP_NOT_BINDABLE:
sprintf(buff, "<functional, %d args>\nCode:", pc[0]);
pc += 3;
break;
case FP_ANONYMOUS:
case FP_ANONYMOUS | FP_NOT_BINDABLE:
COPY_SHORT(&sarg, &pc[2]);
sprintf(buff, "<anonymous function, %d args, %d locals, ends at %04x>\nCode:",
pc[0], pc[1], (pc + 3 + sarg - code));
pc += 4;
break;
}
break;
case F_NUMBER:
COPY_INT(&iarg, pc);
sprintf(buff, "%ld", iarg);
#if SIZEOF_LONG == 4
pc += 4;
#else
pc += 8;
#endif
break;
case F_REAL:
{
float farg;
COPY_FLOAT(&farg, pc);
sprintf(buff, "%f", farg);
pc += 4;
break;
}
case F_SSCANF:
case F_PARSE_COMMAND:
case F_BYTE:
sprintf(buff, "%d", EXTRACT_UCHAR(pc));
pc++;
break;
case F_NBYTE:
sprintf(buff, "-%d", EXTRACT_UCHAR(pc));
pc++;
break;
case F_SWITCH:
{
unsigned char ttype;
unsigned short stable, etable, def;
unsigned int addr;
char *aptr;
char *parg;
ttype = EXTRACT_UCHAR(pc);
COPY_SHORT(&stable, pc + 1);
COPY_SHORT(&etable, pc + 3);
COPY_SHORT(&def, pc + 5);
addr = pc - code;
aptr = pc;
fprintf(f, "switch\n");
fprintf(f, " type: %02x table: %04x-%04x deflt: %04x\n",
(unsigned) ttype, addr + stable,
addr + etable, addr + def);
/* recursively disassemble stuff in switch */
disassemble(f, code, pc - code + 7, addr + stable, prog);
/* now print out table - ugly... */
fprintf(f, " switch table (for %04x)\n",
(unsigned) (pc - code - 1));
if (ttype == 0xfe)
ttype = 0; /* direct lookup */
else if (ttype >> 4 == 0xf)
ttype = 1; /* normal int */
else
ttype = 2; /* string */
pc += stable;
if (ttype == 0) {
i = 0;
while (pc < aptr + etable - 4) {
COPY_SHORT(&sarg, pc);
fprintf(f, "\t%2ld: %04x\n", i++, addr + sarg);
pc += 2;
}
COPY_INT(&iarg, pc);
fprintf(f, "\tminval = %ld\n", iarg);
pc += 4;
} else {
while (pc < aptr + etable) {
COPY_PTR(&parg, pc);
COPY_SHORT(&sarg, pc + SIZEOF_PTR);
if (ttype == 1 || !parg) {
if (sarg == 1)
fprintf(f, "\t%-4ld\t<range start>\n", (long)parg);
else
fprintf(f, "\t%-4ld\t%04x\n", (long)parg, addr+sarg);
} else {
fprintf(f, "\t\"%s\"\t%04x\n",
disassem_string(parg), addr+sarg);
}
pc += 2 + SIZEOF_PTR;
}
}
continue;
}
case F_EFUNV:
sprintf(buff, "%d", EXTRACT_UCHAR(pc++));
instr = EXTRACT_UCHAR(pc++) + ONEARG_MAX;
break;
case F_EFUN0:
case F_EFUN1:
case F_EFUN2:
case F_EFUN3:
instr = EXTRACT_UCHAR(pc++) + ONEARG_MAX;
if (instrs[instr].min_arg != instrs[instr].max_arg) {
sprintf(buff, "%ld", instr - F_EFUN0);
}
break;
case 0:
fprintf(f, "*** zero opcode ***\n");
continue;
}
fprintf(f, "%s %s\n", query_instr_name(instr), buff);
}
if (offsets)
free(offsets);
}
#define INCLUDE_DEPTH 10
static void
dump_line_numbers (FILE * f, program_t * prog) {
unsigned short *fi;
unsigned char *li_start;
unsigned char *li_end;
unsigned char *li;
int addr;
int sz;
ADDRESS_TYPE s;
if (!prog->line_info) {
fprintf(f, "Failed to load line numbers\n");
return;
}
fi = prog->file_info;
li_end = (unsigned char *)(((char *)fi) + fi[0]);
li_start = (unsigned char *)(fi + fi[1]);
fi += 2;
fprintf(f, "\nabsolute line -> (file, line) table:\n");
while (fi < (unsigned short *)li_start) {
fprintf(f, "%i lines from %i [%s]\n", fi[0], fi[1],
prog->strings[fi[1]-1]);
fi += 2;
}
li = li_start;
addr = 0;
fprintf(f,"\naddress -> absolute line table:\n");
while (li < li_end) {
sz = *li++;
#if !defined(USE_32BIT_ADDRESSES)
COPY_SHORT(&s, li);
#else
COPY_INT(&s, li);
#endif
li += sizeof(ADDRESS_TYPE);
fprintf(f, "%4x-%4x: %i\n", addr, addr + sz - 1, s);
addr += sz;
}
}
#endif