// This file is part of SmallBASIC
//
// decompiler
//
// This program is distributed under the terms of the GPL v2.0 or later
// Download the GNU Public License (GPL) from www.gnu.org
//
// Copyright(C) 2000 Nicholas Christopoulos
#include "common/sbapp.h"
/**
*
*/
void prcmd(code_t code) {
char cmd[16];
if (kw_getcmdname(code, cmd)) {
fprintf(stderr, "{%s}", cmd);
} else {
fprintf(stderr, "{N/A:%d}", code);
}
}
/**
*
* decompiler
*
*/
void dump_bytecode(FILE * output) {
int i, c, b, d, h, l, j;
long lng;
int len, new_ip;
char cmd[33];
FILE *fp;
char_p_t *source = NULL;
int lcount = 0, lsize = 0;
// ///////////////
// read source
if (strstr(prog_file, ".bas")) {
fp = fopen(prog_file, "rt");
if (fp) {
char buf[512];
lsize = 1024;
source = tmp_alloc(lsize * sizeof(char_p_t));
lcount = 0;
while (fgets(buf, 511, fp)) {
source[lcount] = tmp_alloc(strlen(buf) + 1);
strcpy(source[lcount], buf);
lcount++;
if (lcount >= lsize) {
lsize += 1024;
source = tmp_realloc(source, lsize * sizeof(char_p_t));
}
}
fclose(fp);
}
}
// ///////////////
fprintf(output, " program size = %d\n", (int) prog_length);
fprintf(output, " variable-count = %d\n", (int) prog_varcount);
fprintf(output, " label-count = %d\n", (int) prog_labcount);
fprintf(output, " lib-count = %d\n", (int) prog_libcount);
fprintf(output, " symbol-count = %d\n", (int) prog_symcount);
// //////////////////
// print label-table
if (prog_labcount) {
fprintf(output, "* label-table:\n");
for (i = 0; i < prog_labcount; i++) {
fprintf(output, " %d = 0x%X (%d)\n", i, (int) tlab[i].ip, (int) tlab[i].ip);
}
} else {
fprintf(output, "* no label-table\n");
}
// //////////////////
// print libs
if (prog_libcount) {
fprintf(output, "* linked-libraries-table:\n");
for (i = 0; i < prog_libcount; i++) {
fprintf(output, " %s: type '%s', lid 0x%0X\n", prog_libtable[i].lib,
((prog_libtable[i].type == 1) ? "unit" : "c-module"),
((prog_libtable[i].type ==
1) ? prog_libtable[i].id | UID_UNIT_BIT : prog_libtable[i].id)
);
}
}
else {
fprintf(output, "* no linked-libraries\n");
}
// //////////////////
// print symbol-table
if (prog_symcount) {
fprintf(output, "* import-symbol-table:\n");
for (i = 0; i < prog_symcount; i++) {
fprintf(output, " %s: type %s, lid 0x%0X, sid %d, vid %d - tid %d, eidx %d\n", prog_symtable[i].symbol,
(prog_symtable[i].type == stt_variable) ? "variable" : ((prog_symtable[i].type ==
stt_procedure) ? "procedure" :
"function"), prog_symtable[i].lib_id,
prog_symtable[i].sym_id, prog_symtable[i].var_id,
prog_symtable[i].task_id, prog_symtable[i].exp_idx);
}
}
else {
fprintf(output, "* no import-symbol-table\n");
}
// //////////////////
// print export symbol-table
if (prog_expcount) {
fprintf(output, "* export-symbol-table:\n");
for (i = 0; i < prog_expcount; i++) {
fprintf(output, " %s: type %s, address %d, related variable id %d\n", prog_exptable[i].symbol,
(prog_exptable[i].type == stt_variable) ? "variable" : ((prog_exptable[i].type ==
stt_procedure) ? "procedure" :
"function"), prog_exptable[i].address,
prog_exptable[i].vid);
}
}
else {
fprintf(output, "* no export-symbol-table\n");
}
// //////////////////
// print code
fprintf(output, "* byte-code:\n");
do {
b = code_getnext();
h = b >> 4;
l = b & 0xF;
fprintf(output, " %08d: %c%c %c; ", (int) prog_ip - 1, "0123456789ABCDEF"[h], "0123456789ABCDEF"[l],
(b >= 32) ? b : 42);
switch (b) {
case kwTYPE_LINE:
c = code_getaddr();
if (source && lcount >= c) {
fprintf(output, "line: %d\n%d: ", c, c);
fprintf(output, "%s", source[c - 1]);
} else {
fprintf(output, "line: %d", c);
}
break;
case kwTYPE_EVPUSH:
fprintf(output, "push (r)esult");
break;
case kwTYPE_EVPOP:
fprintf(output, "pop (l)eft");
break;
case kwTYPE_EOC:
fprintf(output, "end-of-command");
break;
case kwTYPE_CALLF:
// call build-in function
lng = code_getaddr();
kw_getfuncname(lng, cmd);
fprintf(output, "%s; (build-in function %ld)", cmd, lng);
break;
case kwTYPE_CALLP:
// call build-in procedure
lng = code_getaddr();
kw_getprocname(lng, cmd);
fprintf(output, "%s; (build-in procedure %ld)", cmd, lng);
break;
case kwTYPE_CALLEXTF:
case kwTYPE_CALLEXTP: // [lib][index]
// call external (module) function/procedure
c = code_getaddr();
d = code_getaddr();
if (b == kwTYPE_CALLEXTF) {
if (c & UID_UNIT_BIT) {
fprintf(output, "call external (unit) function; lid 0x%X, sid %d", c, d);
} else {
sblmgr_getfuncname(c, prog_symtable[d].exp_idx, cmd);
fprintf(output, "call external (c-lib) function; lid 0x%X, sid %d (%s)", c, d, cmd);
}
} else {
if (c & UID_UNIT_BIT) {
fprintf(output, "call external (unit) procedure; lid 0x%X, sid %d", c, d);
} else {
sblmgr_getprocname(c, prog_symtable[d].exp_idx, cmd);
fprintf(output, "call external (c-lib) procedure; lid 0x%X, sid %d (%s)", c, d, cmd);
}
}
break;
case kwPROC:
fprintf(output, "=== user defined procedure begin");
break;
case kwFUNC:
fprintf(output, "=== user defined function begin");
break;
case kwFILEPRINT:
fprintf(output, "file print");
break;
case kwFILEINPUT:
fprintf(output, "file input");
break;
case kwLINEINPUT:
fprintf(output, "line input");
break;
case kwFORSEP:
fprintf(output, "for-sep");
break;
case kwLOOPSEP:
fprintf(output, "loop-sep");
break;
case kwINPUTSEP:
fprintf(output, "input-sep");
break;
case kwAPPEND:
fprintf(output, "append");
break;
case kwCODEARRAY:
fprintf(output, "array");
break;
case kwTYPE_PARAM:
case kwTYPE_CRVAR:
c = code_getnext();
if (b == kwTYPE_PARAM) {
fprintf(output, "parameter %d: ", c);
} else {
fprintf(output, "local variable %d: ", c);
}
d = 0;
for (j = 0; j < c; j++) {
if (b == kwTYPE_PARAM) {
d = code_getnext();
if (d & 0x80) {
fprintf(output, "&");
}
}
fprintf(output, "%d ", code_getaddr());
}
break;
case kwUSE:
fprintf(output, "use %d ", code_getaddr());
fprintf(output, "exit %d", code_getaddr());
break;
case kwTYPE_RET:
fprintf(output, "=== return; user-defined proc/func end");
break;
case kwTYPE_CALL_UDP:
// call user-defined-procedure
fprintf(output, "call user-defined procedure %d", code_getaddr());
code_skipaddr();
break;
case kwTYPE_CALL_UDF:
// call user-defined-function
fprintf(output, "call user-defined function %d", code_getaddr());
fprintf(output, ", return-variable: %d", code_getaddr());
break;
case kwEXIT:
fprintf(output, "exit ");
c = code_getnext();
switch (c) {
case kwFORSEP:
fprintf(output, "for");
break;
case kwLOOPSEP:
fprintf(output, "loop");
break;
case kwPROCSEP:
fprintf(output, "procedure");
break;
case kwFUNCSEP:
fprintf(output, "function");
break;
default:
fprintf(output, "last-stack-node (undefined)");
}
;
break;
default:
for (c = 0; keyword_table[c].name[0] != '\0'; c++) {
if (b == keyword_table[c].code) {
fprintf(output, "%s ", keyword_table[c].name);
break;
}
}
switch (b) {
case kwTYPE_SEP:
c = code_getnext();
fprintf(output, "\'%c\' ", (c >= 32) ? c : '?');
break;
case kwTYPE_LOGOPR:
case kwTYPE_CMPOPR:
case kwTYPE_ADDOPR:
case kwTYPE_MULOPR:
case kwTYPE_POWOPR:
case kwTYPE_UNROPR:
c = code_getnext();
fprintf(output, "data %d \'%c\' ", c, (c >= 32) ? c : '?');
break;
case kwTYPE_LEVEL_BEGIN:
fprintf(output, "(");
break;
case kwTYPE_LEVEL_END:
fprintf(output, ")");
break;
case kwONJMP:
new_ip = code_getaddr();
code_skipaddr();
b = code_getnext();
c = code_getnext();
fprintf(output, "on %s count %d\n", ((b == kwGOTO) ? "goto" : "gosub"), c);
fprintf(output, " next address %d\n", new_ip);
for (j = 0; j < c; j++) {
fprintf(output, " jump to %d\n", code_getaddr());
}
fprintf(output, "on %s expression:", ((b == kwGOTO) ? "goto" : "gosub"));
break;
case kwGOTO:
new_ip = code_getaddr();
fprintf(output, "; jump to %d ", new_ip);
c = code_getnext();
fprintf(output, "; pop %d stack nodes", c);
break;
case kwOPTION:
c = code_getnext();
new_ip = code_getaddr();
fprintf(output, " option (%d) = %d", c, new_ip);
break;
case kwGOSUB:
c = code_getaddr();
fprintf(output, "id %d ", c);
new_ip = tlab[c].ip;
fprintf(output, "; jump to %d ", new_ip);
break;
case kwLET:
break;
case kwRESTORE:
case kwTYPE_LINE:
case kwLABEL:
case kwTYPE_VAR:
fprintf(output, "id %d ", code_getaddr());
break;
case kwTYPE_INT:
lng = code_getint();
fprintf(output, "value (int) %d (0x%X) ", (int)lng, (int)lng);
break;
case kwTYPE_NUM:
fprintf(output, "value (real) " VAR_NUM_FMT " ", code_getreal());
break;
case kwTYPE_STR:
len = code_getstrlen();
fprintf(output, "\"");
for (j = 0; j < len; j++) {
fprintf(output, "%c", prog_source[prog_ip + j]);
}
fprintf(output, "\"");
prog_ip += len;
break;
case kwIF:
case kwFOR:
case kwWHILE:
case kwREPEAT:
case kwELSE:
case kwELIF:
case kwENDIF:
case kwNEXT:
case kwWEND:
case kwUNTIL:
fprintf(output, "address1 (true?) %d, address2 (false?) %d ", code_getaddr(),
code_getaddr());
break;
}
}
fprintf(output, "\n");
} while (prog_ip < prog_length);
// ///////////////
// delete source
if (source) {
for (i = 0; i < lcount; i++) {
tmp_free(source[i]);
}
tmp_free(source);
}
}
