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radare2/libr/core/pseudo.c

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/* radare - LGPL - Copyright 2015-2017 - pancake */
#include <r_core.h>
#define TYPE_NONE 0
#define TYPE_STR 1
#define TYPE_SYM 2
#define IS_ALPHA(x) (IS_UPPER(x) || IS_LOWER(x))
#define IS_STRING(x,y) ((x)+3<end && *x == 's' && *((x)+1) == 't' && *((x)+2) == 'r' && *((x)+3) == '.')
#define IS_SYMBOL(x,y) ((x)+3<end && *x == 's' && *((x)+1) == 'y' && *((x)+2) == 'm' && *((x)+3) == '.')
typedef struct _find_ctx {
char *comment;
char *left;
char *right;
char *linebegin;
int leftlen;
int rightlen;
int leftpos;
int leftcolor;
int commentcolor;
int rightcolor;
int linecount;
int type;
} RFindCTX;
static void find_and_change (char* in, int len) {
// just to avoid underflows.. len can't be < then len(padding).
if (!in || len < 1) {
return;
}
char *end;
RFindCTX ctx = {0};
end = in + len;
// type = TYPE_NONE;
for (ctx.linebegin = in; in < end; ++in) {
if (*in == '\n' || !*in) {
if (ctx.type == TYPE_SYM && ctx.linecount < 1) {
ctx.linecount++;
ctx.linebegin = in + 1;
continue;
}
if (ctx.type != TYPE_NONE && ctx.right && ctx.left && ctx.rightlen > 0 && ctx.leftlen > 0) {
char* copy = NULL;
if (ctx.leftlen > ctx.rightlen) {
copy = (char*) malloc (ctx.leftlen);
if (copy) {
memcpy (copy, ctx.left, ctx.leftlen);
memcpy (ctx.left, ctx.right, ctx.rightlen);
memmove (ctx.comment - ctx.leftlen + ctx.rightlen, ctx.comment, ctx.right - ctx.comment);
memcpy (ctx.right - ctx.leftlen + ctx.rightlen, copy, ctx.leftlen);
}
} else if (ctx.leftlen < ctx.rightlen) {
if (ctx.linecount < 1) {
copy = (char*) malloc (ctx.rightlen);
if (copy) {
memcpy (copy, ctx.right, ctx.rightlen);
memcpy (ctx.right + ctx.rightlen - ctx.leftlen, ctx.left, ctx.leftlen);
memmove (ctx.comment + ctx.rightlen - ctx.leftlen, ctx.comment, ctx.right - ctx.comment);
memcpy (ctx.left + ctx.rightlen - ctx.leftlen, copy, ctx.rightlen);
}
} else {
// copy = (char*) malloc (ctx.linebegin - ctx.left);
// if (copy) {
// memcpy (copy, ctx.left, ctx.linebegin - ctx.left);
memset (ctx.right - ctx.leftpos, ' ', ctx.leftpos);
*(ctx.right - ctx.leftpos - 1) = '\n';
// memcpy (ctx.comment + 3, copy, ctx.linebegin - ctx.left);
memset (ctx.left, ' ', ctx.leftlen);
memset (ctx.linebegin - ctx.leftlen, ' ', ctx.leftlen);
// }
}
} else if (ctx.leftlen == ctx.rightlen) {
copy = (char*) malloc (ctx.leftlen);
if (copy) {
memcpy (copy, ctx.right, ctx.leftlen);
memcpy (ctx.right, ctx.left, ctx.leftlen);
memcpy (ctx.left, copy, ctx.leftlen);
}
}
free (copy);
}
memset (&ctx, 0, sizeof (ctx));
ctx.linebegin = in + 1;
} else if (!ctx.comment && *in == ';' && in[1] == ' ') {
ctx.comment = in - 1;
ctx.comment[1] = '/';
ctx.comment[2] = '/';
while (!IS_WHITESPACE (*(ctx.comment - ctx.commentcolor))) {
ctx.commentcolor++;
}
ctx.commentcolor--;
} else if (!ctx.comment && ctx.type == TYPE_NONE) {
if (IS_STRING (in, ctx)) {
ctx.type = TYPE_STR;
ctx.left = in;
while (!IS_WHITESPACE (*(ctx.left - ctx.leftcolor))) {
ctx.leftcolor++;
}
ctx.leftcolor--;
ctx.leftpos = ctx.left - ctx.linebegin;
} else if (IS_SYMBOL (in, ctx)) {
ctx.type = TYPE_SYM;
ctx.left = in;
while (!IS_WHITESPACE (*(ctx.left - ctx.leftcolor))) {
ctx.leftcolor++;
}
ctx.leftcolor--;
ctx.leftpos = ctx.left - ctx.linebegin;
}
} else if (ctx.type == TYPE_STR) {
if (!ctx.leftlen && ctx.left && IS_WHITESPACE (*in)) {
ctx.leftlen = in - ctx.left;
} else if (ctx.comment && *in == '"' && in[-1] != '\\') {
if (!ctx.right) {
ctx.right = in;
while (!IS_WHITESPACE (*(ctx.right - ctx.rightcolor))) {
ctx.rightcolor++;
}
ctx.rightcolor--;
} else {
ctx.rightlen = in - ctx.right + 1;
}
}
} else if (ctx.type == TYPE_SYM) {
if (!ctx.leftlen && ctx.left && IS_WHITESPACE (*in)) {
ctx.leftlen = in - ctx.left + 3;
} else if (ctx.comment && *in == '(' && IS_ALPHA (in[-1]) && !ctx.right) {
// ok so i've found a function written in this way:
// type = [const|void|int|float|double|short|long]
// type fcn_name (type arg1, type arg2, ...)
// right now 'in' points at '(', but the function name is before, so i'll go back
// till a space is found
// 'int print(const char*, ...)'
// ^
ctx.right = in - 1;
while (IS_ALPHA (*ctx.right) || *ctx.right == '_' || *ctx.right == '*') {
ctx.right--;
}
// 'int print(const char*, ...)'
// ^
// right now 'in' points at ' ' before 'p' , but there can be a return value
// like 'int' in 'int print(const char*, ...)'.
// so to find for example 'int' we have to go back till a space is found.
// if a non alpha is found, then we can cut from the function name
if (*ctx.right == ' ') {
ctx.right--;
while (IS_ALPHA (*ctx.right) || *ctx.right == '_' || *ctx.right == '*') {
ctx.right--;
}
// moving forward since it points now to non alpha.
ctx.right++;
}
while (!IS_WHITESPACE (*(ctx.right - ctx.rightcolor))) {
ctx.rightcolor++;
}
ctx.rightcolor--;
} else if (ctx.comment && *in == ')' && in[1] != '\'') {
ctx.rightlen = in - ctx.right + 1;
}
}
}
}
R_API int r_core_pseudo_code(RCore *core, const char *input) {
Sdb *db;
ut64 queuegoto = 0LL;
const char *blocktype = "else";
RAnalFunction *fcn = r_anal_get_fcn_in (core->anal, core->offset, R_ANAL_FCN_TYPE_NULL);
RConfigHold *hc = r_config_hold_new (core->config);
if (!hc) {
return false;
}
r_config_save_num (hc, "asm.pseudo", "asm.decode", "asm.lines", "asm.bytes", NULL);
r_config_save_num (hc, "asm.offset", "asm.flags", "asm.fcnlines", "asm.comments", NULL);
r_config_save_num (hc, "asm.functions", "asm.section", "asm.cmtcol", "asm.filter", NULL);
r_config_save_num (hc, "scr.color", "asm.emustr", "asm.emu", "asm.emuwrite", NULL);
r_config_save_num (hc, "io.cache", NULL);
if (!fcn) {
eprintf ("Cannot find function in 0x%08"PFMT64x"\n", core->offset);
r_config_hold_free (hc);
return false;
}
r_config_set_i (core->config, "scr.color", 0);
r_config_set_i (core->config, "asm.pseudo", 1);
r_config_set_i (core->config, "asm.decode", 0);
r_config_set_i (core->config, "asm.filter", 1);
r_config_set_i (core->config, "asm.lines", 0);
r_config_set_i (core->config, "asm.bytes", 0);
r_config_set_i (core->config, "asm.offset", 0);
r_config_set_i (core->config, "asm.flags", 0);
r_config_set_i (core->config, "asm.emu", 1);
r_config_set_i (core->config, "asm.emustr", 1);
r_config_set_i (core->config, "asm.emuwrite", 1);
r_config_set_i (core->config, "asm.fcnlines", 0);
r_config_set_i (core->config, "asm.comments", 1);
r_config_set_i (core->config, "asm.functions", 0);
r_config_set_i (core->config, "asm.tabs", 0);
r_config_set_i (core->config, "asm.section", 0);
r_config_set_i (core->config, "asm.cmtcol", 30);
r_config_set_i (core->config, "io.cache", 1);
r_core_cmd0 (core, "aeim");
db = sdb_new0 ();
// walk all basic blocks
// define depth level for each block
// use it for indentation
// asm.pseudo=true
// asm.decode=true
RAnalBlock *bb = r_list_first (fcn->bbs);
char indentstr[1024] = {0};
int n_bb = r_list_length (fcn->bbs);
r_cons_printf ("function %s () {", fcn->name);
int indent = 1;
int nindent = 1;
RList *visited = r_list_newf (NULL);
r_cons_printf ("\n // %d basic blocks\n", n_bb);
do {
#define I_TAB 4
#define K_MARK(x) sdb_fmt(0,"mark.%"PFMT64x,x)
#define K_ELSE(x) sdb_fmt(0,"else.%"PFMT64x,x)
#define K_INDENT(x) sdb_fmt(0,"loc.%"PFMT64x,x)
#define SET_INDENT(x) { memset (indentstr, ' ', x*I_TAB); indentstr [(x*I_TAB)-2] = 0; }
if (!bb) {
break;
}
r_list_append (visited, bb);
r_cons_push ();
bool html = r_config_get_i (core->config, "scr.html");
r_config_set_i (core->config, "scr.html", 0);
char *code = r_core_cmd_str (core, sdb_fmt (0, "pD %d @ 0x%08"PFMT64x"\n", bb->size, bb->addr));
r_cons_pop ();
r_config_set_i (core->config, "scr.html", html);
if (indent * I_TAB + 2 >= sizeof (indentstr)) {
indent = (sizeof (indentstr) / I_TAB) - 4;
}
memset (indentstr, ' ', indent * I_TAB);
indentstr [(indent * I_TAB) - 2] = 0;
code = r_str_prefix_all (code, indentstr);
if (!code) {
eprintf ("No code here\n");
break;
}
int len = strlen (code);
code[len - 1] = 0; // chop last newline
find_and_change (code, len);
if (!sdb_const_get (db, K_MARK (bb->addr), 0)) {
bool mustprint = !queuegoto || queuegoto != bb->addr;
if (mustprint) {
if (queuegoto) {
r_cons_printf ("\n%s goto loc_0x%llx",
indentstr, queuegoto);
queuegoto = 0LL;
}
r_cons_printf ("\n%s loc_0x%llx:\n", indentstr, bb->addr);
indentstr[(indent * I_TAB) - 2] = 0;
r_cons_printf ("\n%s", code);
free (code);
sdb_num_set (db, K_MARK (bb->addr), 1, 0);
}
}
if (sdb_const_get (db, K_INDENT (bb->addr), 0)) {
// already analyzed, go pop and continue
// XXX check if cant pop
//eprintf ("%s// 0x%08llx already analyzed\n", indentstr, bb->addr);
ut64 addr = sdb_array_pop_num (db, "indent", NULL);
if (addr == UT64_MAX) {
int i;
nindent = 1;
for (i = indent; i != nindent; i--) {
SET_INDENT (i);
r_cons_printf ("\n%s}", indentstr);
}
r_cons_printf ("\n%sreturn;\n", indentstr);
RAnalBlock *nbb = r_anal_bb_from_offset (core->anal, bb->fail);
if (r_list_contains (visited, nbb)) {
nbb = r_anal_bb_from_offset (core->anal, bb->jump);
if (r_list_contains (visited, nbb)) {
nbb = NULL;
}
}
if (!nbb) {
break;
}
bb = nbb;
indent--;
continue;
}
if (sdb_num_get (db, K_ELSE (bb->addr), 0)) {
if (!strcmp (blocktype, "else")) {
r_cons_printf ("\n%s } %s {", indentstr, blocktype);
} else {
r_cons_printf ("\n%s } %s (?);", indentstr, blocktype);
}
} else {
r_cons_printf ("\n%s}", indentstr);
}
if (addr != bb->addr) {
queuegoto = addr;
// r_cons_printf ("\n%s goto loc_0x%llx", indentstr, addr);
}
bb = r_anal_bb_from_offset (core->anal, addr);
if (!bb) {
eprintf ("failed block\n");
break;
}
//eprintf ("next is %llx\n", addr);
nindent = sdb_num_get (db, K_INDENT (addr), NULL);
if (indent > nindent && !strcmp (blocktype, "else")) {
int i;
for (i = indent; i != nindent; i--) {
SET_INDENT (i);
r_cons_printf ("\n%s }", indentstr);
}
}
indent = nindent;
} else {
sdb_set (db, K_INDENT (bb->addr), "passed", 0);
if (bb->jump != UT64_MAX) {
int swap = 1;
// TODO: determine which branch take first
ut64 jump = swap ? bb->jump : bb->fail;
ut64 fail = swap ? bb->fail : bb->jump;
// if its from another function chop it!
RAnalFunction *curfcn = r_anal_get_fcn_in (core->anal, jump, R_ANAL_FCN_TYPE_NULL);
if (curfcn != fcn) {
// chop that branch
r_cons_printf ("\n // chop\n");
// break;
}
if (sdb_get (db, K_INDENT (jump), 0)) {
// already tracekd
if (!sdb_get (db, K_INDENT (fail), 0)) {
bb = r_anal_bb_from_offset (core->anal, fail);
}
} else {
bb = r_anal_bb_from_offset (core->anal, jump);
if (!bb) {
eprintf ("failed to retrieve blcok at 0x%"PFMT64x"\n", jump);
break;
}
if (fail != UT64_MAX) {
// do not push if already pushed
indent++;
if (sdb_get (db, K_INDENT (bb->fail), 0)) {
/* do nothing here */
eprintf ("BlockAlready 0x%"PFMT64x"\n", bb->addr);
} else {
// r_cons_printf (" { RADICAL %llx\n", bb->addr);
sdb_array_push_num (db, "indent", fail, 0);
sdb_num_set (db, K_INDENT (fail), indent, 0);
sdb_num_set (db, K_ELSE (fail), 1, 0);
SET_INDENT (indent);
r_cons_printf ("\n%s {", indentstr);
}
} else {
r_cons_printf ("\n%s do", indentstr);
sdb_array_push_num (db, "indent", jump, 0);
sdb_num_set (db, K_INDENT (jump), indent, 0);
sdb_num_set (db, K_ELSE (jump), 1, 0);
if (jump <= bb->addr) {
blocktype = "while";
} else {
blocktype = "else";
}
r_cons_printf ("\n%s {", indentstr);
indent++;
}
}
} else {
ut64 addr = sdb_array_pop_num (db, "indent", NULL);
if (addr == UT64_MAX) {
r_cons_printf ("\n(break)\n");
break;
}
bb = r_anal_bb_from_offset (core->anal, addr);
nindent = sdb_num_get (db, K_INDENT (addr), NULL);
if (indent > nindent) {
int i;
for (i = indent; i != nindent; i--) {
SET_INDENT (i);
r_cons_printf ("\n%s}", indentstr);
}
}
if (nindent != indent) {
r_cons_printf ("\n%s} else {\n", indentstr);
}
indent = nindent;
}
}
//n_bb --;
} while (n_bb > 0);
r_list_free (visited);
r_cons_printf ("\n}\n");
r_config_restore (hc);
r_config_hold_free (hc);
sdb_free (db);
return true;
}
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