radare2/libr/anal/fcn.c

/* radare - LGPL - Copyright 2010-2015 - nibble, pancake */

#include <r_anal.h>
#include <r_util.h>
#include <r_list.h>

// XXX must be configurable by the user
#define FCN_DEPTH 512

// 16 KB is the maximum size for a basic block
#define MAXBBSIZE 16 * 1024

#define JMP_IS_EOB 1
#define JMP_IS_EOB_RANGE 32
#define CALL_IS_EOB 0

// 64KB max size
// 256KB max function size
#define MAX_FCN_SIZE (1024*256)

#define MAX_JMPTBL_SIZE 1000
#define MAX_JMPTBL_JMP 10000

#define DB a->sdb_fcns
#define EXISTS(x,y...) snprintf (key, sizeof(key)-1,x,##y),sdb_exists(DB,key)
#define SETKEY(x,y...) snprintf (key, sizeof (key)-1, x,##y);

#define VERBOSE_DELAY if(0)

R_API const char *r_anal_fcn_type_tostring(int type) {
	switch (type) {
	case R_ANAL_FCN_TYPE_NULL: return "null";
	case R_ANAL_FCN_TYPE_FCN: return "fcn";
	case R_ANAL_FCN_TYPE_LOC: return "loc";
	case R_ANAL_FCN_TYPE_SYM: return "sym";
	case R_ANAL_FCN_TYPE_IMP: return "imp";
	case R_ANAL_FCN_TYPE_ROOT: return "root";
	}
	return "unk";
}

R_API int r_anal_fcn_resize (RAnalFunction *fcn, int newsize) {
	ut64 eof; /* end of function */
	RAnalBlock *bb;
	RListIter *iter, *iter2;
	if (!fcn || newsize<1)
		return false;
	fcn->size = newsize;
	eof = fcn->addr + fcn->size;
	r_list_foreach_safe (fcn->bbs, iter, iter2, bb) {
		if (bb->addr >= eof) {
			// already called by r_list_delete r_anal_bb_free (bb);
			r_list_delete (fcn->bbs, iter);
			continue;
		}
		if (bb->addr + bb->size >= eof) {
			bb->size = eof - bb->addr;
		}
		if (bb->jump != UT64_MAX && bb->jump >= eof) {
			bb->jump = UT64_MAX;
		}
		if (bb->fail != UT64_MAX && bb->fail >= eof) {
			bb->fail = UT64_MAX;
		}
	}
	return true;
}

R_API RAnalFunction *r_anal_fcn_new() {
	RAnalFunction *fcn = R_NEW0 (RAnalFunction);
	if (!fcn) return NULL;
	/* Function return type */
	fcn->rets = 0;
	fcn->size = 0;
	/* Function qualifier: static/volatile/inline/naked/virtual */
	fcn->fmod = R_ANAL_FQUALIFIER_NONE;
	/* Function calling convention: cdecl/stdcall/fastcall/etc */
	fcn->call = R_ANAL_CC_TYPE_NONE;
	/* Function attributes: weak/noreturn/format/etc */
	fcn->addr = UT64_MAX;
	fcn->bits = 0;
#if FCN_OLD
	fcn->refs = r_anal_ref_list_new ();
	fcn->xrefs = r_anal_ref_list_new ();
#endif
	fcn->bbs = r_anal_bb_list_new ();
	fcn->fingerprint = NULL;
	fcn->diff = r_anal_diff_new ();
	return fcn;
}

R_API RList *r_anal_fcn_list_new() {
	RList *list = r_list_new ();
	if (!list) return NULL;
	list->free = &r_anal_fcn_free;
	return list;
}

R_API void r_anal_fcn_free(void *_fcn) {
	RAnalFunction *fcn = _fcn;
	if (!_fcn) return;
	fcn->size = 0;
	free (fcn->name);
	free (fcn->attr);
#if FCN_OLD
	r_list_free (fcn->refs);
	r_list_free (fcn->xrefs);
#endif
	r_list_free (fcn->locs);
	if (fcn->bbs) {
		fcn->bbs->free = (RListFree)r_anal_bb_free;
		r_list_free (fcn->bbs);
		fcn->bbs = NULL;
	}

	free (fcn->fingerprint);
	r_anal_diff_free (fcn->diff);
	free (fcn->args);
	free (fcn);
}

R_API int r_anal_fcn_xref_add (RAnal *a, RAnalFunction *fcn, ut64 at, ut64 addr, int type) {
	RAnalRef *ref;
	if (!fcn || !a)
		return false;
	if (!a->iob.is_valid_offset (a->iob.io, addr, 0))
		return false;
	ref = r_anal_ref_new ();
	if (!ref)
		return false;
	// set global reference
	r_anal_xrefs_set (a, type, at, addr);
	// set per-function reference
#if FCN_OLD
	ref->at = at; // from
	ref->addr = addr; // to
	ref->type = type;
	// TODO: ensure we are not dupping xrefs
	r_list_append (fcn->refs, ref);
#endif
#if FCN_SDB
	sdb_add (DB, sdb_fmt (0, "fcn.0x%08"PFMT64x".name", fcn->addr), fcn->name, 0);
	// encode the name in base64 ?
	sdb_num_add (DB, sdb_fmt (0, "fcn.name.%s", fcn->name), fcn->addr, 0);
	sdb_array_add_num (DB,
		sdb_fmt (0, "fcn.0x%08"PFMT64x".xrefs", fcn->addr),
		at, 0);
#endif
	return true;
}

R_API int r_anal_fcn_xref_del (RAnal *a, RAnalFunction *fcn, ut64 at, ut64 addr, int type) {
#if FCN_OLD
	RAnalRef *ref;
	RListIter *iter;
	/* No need for _safe loop coz we return immediately after the delete. */
	r_list_foreach (fcn->xrefs, iter, ref) {
		if ((type != -1 || type == ref->type)  &&
			(at == 0LL || at == ref->at) &&
			(addr == 0LL || addr == ref->addr)) {
				r_list_delete (fcn->xrefs, iter);
				return true;
		}
	}
#endif
#if FCN_SDB
	// TODO
	//sdb_array_delete_num (DB, key, at, 0);
#endif
	return false;
}

static RAnalBlock *bbget(RAnalFunction *fcn, ut64 addr) {
	RListIter *iter;
	RAnalBlock *bb;
	r_list_foreach (fcn->bbs, iter, bb) {
		ut64 eaddr = bb->addr + bb->size;
		if (bb->addr >= eaddr) {
			if (addr == bb->addr)
				return bb;
		}
		if ((addr >= bb->addr) && (addr < eaddr)) {
			return bb;
		}
	}
	return NULL;
}

static RAnalBlock* appendBasicBlock (RAnal *anal, RAnalFunction *fcn, ut64 addr) {
	RAnalBlock *bb;

	bb = r_anal_bb_new ();
	if (!bb) return NULL;
	bb->addr = addr;
	bb->size = 0;
	bb->jump = UT64_MAX;
	bb->fail = UT64_MAX;
	bb->type = 0; // TODO
	r_list_append (fcn->bbs, bb);
	if (anal->cb.on_fcn_bb_new) {
		anal->cb.on_fcn_bb_new (anal, anal->user, fcn, bb);
	}
	return bb;
}

#define FITFCNSZ() {\
	st64 n = bb->addr+bb->size-fcn->addr; \
	if (n>=0 && fcn->size<n) {fcn->size=n; } } \
	if (fcn->size > MAX_FCN_SIZE) { \
		eprintf ("Function too big at 0x%"PFMT64x" + %d\n", bb->addr, fcn->size); \
		fcn->size = 0; \
		return R_ANAL_RET_ERROR; }

#define VARPREFIX "local"
//#define VARPREFIX "var"
#define ARGPREFIX "arg"
static char *get_varname (RAnal *a, const char *pfx, int idx) {
	char *s;
	int word = a->bits / 8;
	if (idx%word) {
		s = r_str_newf ("%s_%d_%d", pfx, idx/word, R_ABS(idx%word));
	} else {
		s = r_str_newf ("%s_%d", pfx, idx/word);
	}
	return s;
}

static int fcn_recurse(RAnal *anal, RAnalFunction *fcn, ut64 addr, ut8 *buf, ut64 len, int depth);
#define recurseAt(x) { \
	ut8 *bbuf = malloc (MAXBBSIZE);\
	anal->iob.read_at (anal->iob.io, x, bbuf, MAXBBSIZE); \
	ret = fcn_recurse (anal, fcn, x, bbuf, MAXBBSIZE, depth-1); \
	free (bbuf); \
}

static int try_walkthrough_jmptbl(RAnal *anal, RAnalFunction *fcn, int depth, ut64 ip, ut64 ptr, int ret0) {
	int ret = ret0;
	ut8 *jmptbl = malloc (MAX_JMPTBL_SIZE);
	ut64 offs, sz = anal->bits >> 3;
	if (!jmptbl) return 0;
	anal->iob.read_at (anal->iob.io, ptr, jmptbl, MAX_JMPTBL_SIZE);
	for (offs = 0; offs < MAX_JMPTBL_SIZE; offs += sz) {
		ut64 jmpptr = 0;
		r_mem_copyendian ((ut8*)&jmpptr, jmptbl + offs, sz, !anal->big_endian);
		if (anal->limit) {
			if (jmpptr < anal->limit->from || jmpptr > anal->limit->to)
				break;
		}
		if (jmpptr < ip - MAX_JMPTBL_JMP || jmpptr > ip + MAX_JMPTBL_JMP) {
			break;
		}
		recurseAt (jmpptr);
	}
	free (jmptbl);
	return ret;
}

static ut64 search_reg_val(RAnal *anal, ut8 *buf, ut64 len, ut64 addr, char *regsz) {
	ut64 offs, oplen;
	RAnalOp op = {0};
	ut64 ret = UT64_MAX;
	for (offs = 0; offs < len; offs += oplen) {
		r_anal_op_fini (&op);
		if ((oplen = r_anal_op (anal, &op, addr + offs, buf + offs, len - offs)) < 1) {
			break;
		}
		if (op.dst && op.dst->reg && !strcmp(op.dst->reg->name, regsz)) {
			if (op.src[0]) ret = op.src[0]->delta;
		}
	}
	return ret;
}

#define gotoBeach(x) ret=x;goto beach;
#define gotoBeachRet() goto beach;
static int fcn_recurse(RAnal *anal, RAnalFunction *fcn, ut64 addr, ut8 *buf, ut64 len, int depth) {
	int continue_after_jump = anal->opt.afterjmp;
	RAnalBlock *bb = NULL;
	RAnalBlock *bbg = NULL;
	int ret = R_ANAL_RET_END;
	int overlapped = 0;
	char *varname;
	RAnalOp op = {0};
	int oplen, idx = 0;
	struct {
		int cnt;
		int idx;
		int after;
		int pending;
		int adjust;
		int un_idx; // delay.un_idx
	} delay = {0};
	if (anal->sleep) {
		r_sys_usleep (anal->sleep);
	}

	if (depth<1) {
		eprintf ("That's too deep\n");
		return R_ANAL_RET_ERROR; // MUST BE TOO DEEP
	}

	// check if address is readable //:
	if (!anal->iob.is_valid_offset (anal->iob.io, addr, 0)) {
		if (addr != UT64_MAX && !anal->iob.io->va) {
			eprintf ("Invalid address 0x%"PFMT64x". Try with io.va=true\n", addr);
		}
		return R_ANAL_RET_ERROR; // MUST BE TOO DEEP
	}

	if (r_anal_get_fcn_at (anal, addr, 0)) {
		return R_ANAL_RET_ERROR; // MUST BE NOT FOUND
	}
	bb = bbget (fcn, addr);
	if (bb) {
		r_anal_fcn_split_bb (anal, fcn, bb, addr);
		if (anal->opt.recont)
			return R_ANAL_RET_END;
		return R_ANAL_RET_ERROR; // MUST BE NOT DUP
	}

	bb = appendBasicBlock (anal, fcn, addr);

	VERBOSE_ANAL eprintf ("Append bb at 0x%08"PFMT64x
		" (fcn 0x%08"PFMT64x")\n", addr, fcn->addr);

	while (idx < len) {
		if (anal->limit) {
			if ((addr+idx)<anal->limit->from || (addr+idx+1)>anal->limit->to)
				break;
		}
repeat:
		if ((len-idx)<5) {
			break;
		}
		r_anal_op_fini (&op);
		if (buf[idx]==buf[idx+1] && buf[idx]==0xff && buf[idx+2]==0xff) {
			FITFCNSZ();
			VERBOSE_ANAL eprintf ("FFFF opcode at 0x%08"PFMT64x"\n", addr+idx);
			return R_ANAL_RET_ERROR;
		}
		// check if opcode is in another basic block
		// in that case we break
		if ((oplen = r_anal_op (anal, &op, addr+idx, buf+idx, len-idx)) < 1) {
			VERBOSE_ANAL eprintf ("Unknown opcode at 0x%08"PFMT64x"\n", addr+idx);
			if (idx == 0) {
				gotoBeach (R_ANAL_RET_END);
			} else {
				break; // unspecified behaviour
			}
		}
		if (idx>0 && !overlapped) {
			bbg = bbget (fcn, addr+idx);
			if (bbg && bbg != bb) {
				bb->jump = addr+idx;
				overlapped = 1;
				VERBOSE_ANAL eprintf ("Overlapped at 0x%08"PFMT64x"\n", addr+idx);
				//return R_ANAL_RET_END;
			}
		}
		if (!overlapped) {
			r_anal_bb_set_offset (bb, bb->ninstr, addr + idx - bb->addr);
			bb->size += oplen;
			bb->ninstr++;

			fcn->ninstr++;
		//	FITFCNSZ(); // defer this, in case this instruction is a branch delay entry
		//	fcn->size += oplen; /// XXX. must be the sum of all the bblocks
		}
		idx += oplen;
		delay.un_idx = idx;
		if (op.delay>0 && delay.pending == 0) {
			// Handle first pass through a branch delay jump:
			// Come back and handle the current instruction later.
			// Save the location of it in `delay.idx`
			// note, we have still increased size of basic block
			// (and function)
			VERBOSE_DELAY eprintf ("Enter branch delay at 0x%08"PFMT64x ". bb->sz=%d\n", addr+idx-oplen, bb->size);
			delay.idx = idx - oplen;
			delay.cnt = op.delay;
			delay.pending = 1; // we need this in case the actual idx is zero...
			delay.adjust = !overlapped; // adjustment is required later to avoid double count
			continue;
		}

		if (delay.cnt > 0) {
			// if we had passed a branch delay instruction, keep
			// track of how many still to process.
			delay.cnt--;
			if (delay.cnt == 0) {
				VERBOSE_DELAY eprintf ("Last branch delayed opcode at 0x%08"PFMT64x ". bb->sz=%d\n", addr+idx-oplen, bb->size);
				delay.after = idx;
				idx = delay.idx;
				// At this point, we are still looking at the
				// last instruction in the branch delay group.
				// Next time, we will again be looking
				// at the original instruction that entered
				// the branch delay.
			}
		} else if (op.delay > 0 && delay.pending) {
			VERBOSE_DELAY eprintf ("Revisit branch delay jump at 0x%08"PFMT64x ". bb->sz=%d\n", addr+idx-oplen, bb->size);
			// This is the second pass of the branch delaying opcode
			// But we also already counted this instruction in the
			// size of the current basic block, so we need to fix that
			if (delay.adjust) {
				bb->size -= oplen;
				fcn->ninstr--;
				VERBOSE_DELAY eprintf ("Correct for branch delay @ %08"PFMT64x " bb.addr=%08"PFMT64x " corrected.bb=%d f.uncorr=%d\n",
						addr + idx - oplen, bb->addr, bb->size, fcn->size);
				FITFCNSZ();
			}
			// Next time, we go to the opcode after the delay count
			// Take care not to use this below, use delay.un_idx instead ...
			idx = delay.after;
			delay.pending = delay.after = delay.idx = delay.adjust = 0;
		}
		// Note: if we got two branch delay instructions in a row due to an
		// compiler bug or junk or something it wont get treated as a delay
		/* TODO: Parse fastargs (R_ANAL_VAR_ARGREG) */
		switch (op.stackop) {
		case R_ANAL_STACK_INC:
			fcn->stack += op.val;
			break;
		// TODO: use fcn->stack to know our stackframe
		case R_ANAL_STACK_SET:
			if ((int)op.ptr > 0) {
				varname = get_varname (anal, ARGPREFIX, R_ABS(op.ptr));
				r_anal_var_add (anal, fcn->addr, 1, op.ptr,
						'a', NULL, anal->bits/8, varname);
				// TODO: DIR_IN?
			} else {
				varname = get_varname (anal, VARPREFIX, R_ABS(op.ptr));
				r_anal_var_add (anal, fcn->addr, 1, -op.ptr,
						'v', NULL, anal->bits/8, varname);
			}
			free (varname);
			break;
		// TODO: use fcn->stack to know our stackframe
		case R_ANAL_STACK_GET:
			if (((int)op.ptr) > 0) {
				varname = get_varname (anal, ARGPREFIX, R_ABS(op.ptr));
				r_anal_var_add (anal, fcn->addr, 1, op.ptr, 'a', NULL, anal->bits/8, varname);
				r_anal_var_access (anal, fcn->addr, 'a', 0, op.ptr, 0, op.addr);
			} else {
				varname = get_varname (anal, VARPREFIX, R_ABS(op.ptr));
				r_anal_var_add (anal, fcn->addr, 1, -op.ptr, 'v', NULL, anal->bits/8, varname);
				r_anal_var_access (anal, fcn->addr, 'v', 0, -op.ptr, 0, -op.addr);
			}
			free (varname);
			break;
		}

		if (op.ptr && op.ptr != UT64_MAX && op.ptr != UT32_MAX) {
			// swapped parameters wtf
			r_anal_fcn_xref_add (anal, fcn, op.addr, op.ptr, R_ANAL_REF_TYPE_DATA);
		}

		switch (op.type) {
		case R_ANAL_OP_TYPE_ILL:
			if (anal->opt.nopskip && !memcmp (buf, "\x00\x00\x00\x00", 4)) {
				if ((addr + delay.un_idx-oplen) == fcn->addr) {
					fcn->addr += oplen;
					bb->size -= oplen;
					bb->addr += oplen;
					idx = delay.un_idx;
					goto repeat;
				} else {
					// sa
					bb->size -= oplen;
					op.type = R_ANAL_OP_TYPE_RET;
				}
			}
			FITFCNSZ ();
			r_anal_op_fini (&op);
			gotoBeach (R_ANAL_RET_END);
			break;
		case R_ANAL_OP_TYPE_TRAP:
			if (anal->opt.nopskip && buf[0]==0xcc) {
				if ((addr + delay.un_idx-oplen) == fcn->addr) {
					fcn->addr += oplen;
					bb->size -= oplen;
					bb->addr += oplen;
					idx = delay.un_idx;
					goto repeat;
				}
			}
			FITFCNSZ ();
			r_anal_op_fini (&op);
			return R_ANAL_RET_END;
		case R_ANAL_OP_TYPE_NOP:
			if (anal->opt.nopskip) {
				RFlagItem *fi = anal->flb.get_at (anal->flb.f, addr);
				// do not skip nops if there's a flag at starting address
				if (!fi || strncmp (fi->name, "sym.", 4)) {
					if ((addr + delay.un_idx - oplen) == fcn->addr) {
						fcn->addr += oplen;
						bb->size -= oplen;
						bb->addr += oplen;
						idx = delay.un_idx;
						goto repeat;
					}
				}
			}
			break;
		case R_ANAL_OP_TYPE_JMP:
			if (anal->opt.jmpref)
				(void) r_anal_fcn_xref_add (anal, fcn, op.addr, op.jump, R_ANAL_REF_TYPE_CODE);
			if (r_anal_noreturn_at (anal, op.jump) ||
					(op.jump < fcn->addr && !anal->opt.jmpabove)) {
				FITFCNSZ ();
				r_anal_op_fini (&op);
				return R_ANAL_RET_END;
			}
			if (anal->opt.eobjmp) {
				FITFCNSZ();
				op.jump = UT64_MAX;
				recurseAt (op.jump);
				recurseAt (op.fail);
				gotoBeachRet ();
				return R_ANAL_RET_END;
			}
			if (anal->opt.bbsplit) {
				if (!overlapped) {
					bb->jump = op.jump;
					bb->fail = UT64_MAX;
				}
				recurseAt (op.jump);
				gotoBeachRet ();
			} else {
				if (continue_after_jump) {
					recurseAt (op.jump);
					recurseAt (op.fail);
				} else {
					// This code seems to break #1519
					if (anal->opt.eobjmp) {
#if JMP_IS_EOB
						if (!overlapped) {
							bb->jump = op.jump;
							bb->fail = UT64_MAX;
						}
						FITFCNSZ();
						return R_ANAL_RET_END;
#else
						// hardcoded jmp size // must be checked at the end wtf?
						// always fitfcnsz and retend
						if (op.jump>fcn->addr && op.jump<(fcn->addr+fcn->size)) {
							/* jump inside the same function */
							FITFCNSZ();
							return R_ANAL_RET_END;
#if JMP_IS_EOB_RANGE>0
						} else {
							if (op.jump < addr-JMP_IS_EOB_RANGE && op.jump<addr) {
								gotoBeach (R_ANAL_RET_END);
							}
							if (op.jump > addr+JMP_IS_EOB_RANGE) {
								gotoBeach (R_ANAL_RET_END);
							}
#endif
						}
#endif
					} else {
						/* if not eobjmp. a jump will break the function if jumps before the beginning of the function */
						if (op.jump < fcn->addr) {
							if (!overlapped) {
								bb->jump = op.jump;
								bb->fail = UT64_MAX;
							}
							FITFCNSZ();
							return R_ANAL_RET_END;
						}
					}
				}
			}
			break;
		case R_ANAL_OP_TYPE_CJMP:
			if (anal->opt.cjmpref) {
				(void) r_anal_fcn_xref_add (anal, fcn,
					op.addr, op.jump, R_ANAL_REF_TYPE_CODE);
			}
			if (!overlapped) {
				bb->jump = op.jump;
				bb->fail = op.fail;
			}
			if (continue_after_jump) {
				recurseAt (op.jump);
				recurseAt (op.fail);
			} else {
				// This code seems to break #1519
				if (anal->opt.eobjmp) {
#if JMP_IS_EOB
					if (!overlapped) {
						bb->jump = op.jump;
						bb->fail = UT64_MAX;
					}
					FITFCNSZ();
					recurseAt (op.jump);
					recurseAt (op.fail);
					return R_ANAL_RET_END;
#else
					// hardcoded jmp size // must be checked at the end wtf?
					// always fitfcnsz and retend
					if (op.jump>fcn->addr+JMP_IS_EOB_RANGE) {
						recurseAt (op.fail);
						/* jump inside the same function */
						FITFCNSZ();
						return R_ANAL_RET_END;
#if JMP_IS_EOB_RANGE>0
					} else {
						if (op.jump < addr-JMP_IS_EOB_RANGE && op.jump<addr) {
							gotoBeach (R_ANAL_RET_END);
						}
						if (op.jump > addr+JMP_IS_EOB_RANGE) {
							gotoBeach (R_ANAL_RET_END);
						}
#endif
					}
#endif
					recurseAt (op.jump);
					recurseAt (op.fail);
				} else {
					/* if not eobjmp. a jump will break the function if jumps before the beginning of the function */
					recurseAt (op.jump);
					recurseAt (op.fail);
					if (op.jump < fcn->addr) {
						if (!overlapped) {
							bb->jump = op.jump;
							bb->fail = UT64_MAX;
						}
						FITFCNSZ();
						return R_ANAL_RET_END;
					}
				}
			}

			// XXX breaks mips analysis too !op.delay
			// this will be all x86, arm (at least)
			// without which the analysis is really slow,
			// presumably because each opcode would get revisited
			// (and already covered by a bb) many times
			gotoBeachRet();
			// For some reason, branch delayed code (MIPS) needs to continue
			break;
		case R_ANAL_OP_TYPE_CCALL:
		case R_ANAL_OP_TYPE_CALL:
			if (r_anal_noreturn_at (anal, op.jump)) {
				FITFCNSZ ();
				r_anal_op_fini (&op);
				return R_ANAL_RET_END;
			}
			(void)r_anal_fcn_xref_add (anal, fcn, op.addr, op.jump, R_ANAL_REF_TYPE_CALL);
#if CALL_IS_EOB
			recurseAt (op.jump);
			recurseAt (op.fail);
			gotoBeach (R_ANAL_RET_NEW);
#endif
			break;
		case R_ANAL_OP_TYPE_UJMP:
			// switch statement
			if (anal->opt.jmptbl) {
				if (fcn->refs->tail) {
					RAnalRef *last_ref = fcn->refs->tail->data;
					last_ref->type = R_ANAL_REF_TYPE_NULL;
				}

				if (op.ptr != UT64_MAX) {	// direct jump
					ret = try_walkthrough_jmptbl (anal, fcn, depth, addr + idx, op.ptr, ret);

				} else {	// indirect jump: table pointer is unknown
					if (op.src[0] && op.src[0]->reg) {
						ut64 ptr = search_reg_val(anal, buf, idx, addr, op.src[0]->reg->name);
						if (ptr && ptr != UT64_MAX)
							ret = try_walkthrough_jmptbl (anal, fcn, depth, addr + idx, ptr, ret);
					}
				}

			}
			if (!anal->opt.eobjmp) {
				if (continue_after_jump) {
					break;
				} else {
					FITFCNSZ ();
					r_anal_op_fini (&op);
					return R_ANAL_RET_END;
				}
			}
			/* fallthru */
		case R_ANAL_OP_TYPE_RET:
			VERBOSE_ANAL eprintf ("RET 0x%08"PFMT64x". %d %d %d\n",
				addr+delay.un_idx-oplen, overlapped,
				bb->size, fcn->size);
			FITFCNSZ ();
			r_anal_op_fini (&op);
			return R_ANAL_RET_END;
		}
	}
beach:
	r_anal_op_fini (&op);
	FITFCNSZ ();
	return ret;
}

static int check_preludes(ut8 *buf, ut16 bufsz) {
	if (bufsz < 10) return false;
	if (!memcmp(buf, (const ut8 *)"\x55\x89\xe5", 3))
		return true;
	else if (!memcmp(buf, (const ut8 *)"\x55\x8b\xec", 3))
		return true;
	else if (!memcmp(buf, (const ut8 *)"\x8b\xff", 2))
		return true;
	else if (!memcmp(buf, (const ut8 *)"\x55\x48\x89\xe5", 4))
		return true;
	else if (!memcmp(buf, (const ut8 *)"\x55\x48\x8b\xec", 4))
		return true;
	return false;
}

R_API int check_fcn(RAnal *anal, ut8 *buf, ut16 bufsz, ut64 addr, ut64 low, ut64 high) {
	RAnalOp op = {0};
	int i, oplen, opcnt = 0, pushcnt = 0, movcnt = 0, brcnt = 0;
	if (check_preludes(buf, bufsz)) return true;
	for (i = 0; i < bufsz && opcnt < 10; i += oplen, opcnt++) {
		r_anal_op_fini (&op);
		if ((oplen = r_anal_op (anal, &op, addr+i, buf+i, bufsz-i)) < 1) {
			return false;
		}
		switch (op.type) {
		case R_ANAL_OP_TYPE_PUSH:
		case R_ANAL_OP_TYPE_UPUSH:
			pushcnt++;
			break;
		case R_ANAL_OP_TYPE_MOV:
		case R_ANAL_OP_TYPE_CMOV:
			movcnt++;
			break;
		case R_ANAL_OP_TYPE_JMP:
		case R_ANAL_OP_TYPE_CJMP:
		case R_ANAL_OP_TYPE_CALL:
			if (op.jump < low || op.jump >= high) return false;
			brcnt++;
			break;
		case R_ANAL_OP_TYPE_UNK:
			return false;
		}
	}
	return (pushcnt + movcnt + brcnt > 5);
}

static void fcnfit (RAnal *a, RAnalFunction *f) {
	// find next function
	RAnalFunction *next = r_anal_fcn_next (a, f->addr);
	if (next) {
		if ((f->addr + f->size)> next->addr) {
			r_anal_fcn_resize (f, (next->addr - f->addr));
		}
	}
}

R_API void r_anal_fcn_fit_overlaps (RAnal *anal, RAnalFunction *fcn) {
	if (fcn) {
		fcnfit (anal, fcn);
	} else {
		RAnalFunction *f;
		RListIter *iter;
		r_list_foreach (anal->fcns, iter, f) {
			fcnfit (anal, f);
		}
	}
}

static int cmpaddr (const void *_a, const void *_b) {
	const RAnalBlock *a = _a, *b = _b;
	return (a->addr > b->addr);
}

R_API void r_anal_trim_jmprefs(RAnalFunction *fcn) {
	RAnalRef *ref;
	RListIter *iter;
	RListIter *tmp;
	r_list_foreach_safe (fcn->refs, iter, tmp, ref) {
		if (ref->type == R_ANAL_REF_TYPE_CODE &&
				ref->addr >= fcn->addr && (ref->addr - fcn->addr) < fcn->size) {
			r_list_delete(fcn->refs, iter);
		}
	}
}

R_API int r_anal_fcn(RAnal *anal, RAnalFunction *fcn, ut64 addr, ut8 *buf, ut64 len, int reftype) {
	int ret;
	fcn->size = 0;
	fcn->type = (reftype == R_ANAL_REF_TYPE_CODE)?
			R_ANAL_FCN_TYPE_LOC: R_ANAL_FCN_TYPE_FCN;
	if (fcn->addr == UT64_MAX) fcn->addr = addr;
	if (anal->cur && anal->cur->fcn) {
		int result = anal->cur->fcn (anal, fcn, addr, buf, len, reftype);
		if (anal->cur->custom_fn_anal) return result;
	}
	ret = fcn_recurse (anal, fcn, addr, buf, len, FCN_DEPTH);

	if (ret == R_ANAL_RET_END && fcn->size) {	// cfg analysis completed
		RListIter *iter;
		RAnalBlock *bb;
		ut64 endaddr = fcn->addr;
		ut64 overlapped = -1;
		RAnalFunction *fcn1 = NULL;

		// set function size as length of continuous sequence of bbs
		r_list_sort (fcn->bbs, &cmpaddr);
		r_list_foreach (fcn->bbs, iter, bb) {
			if (endaddr == bb->addr) {
				endaddr += bb->size;
			} else if (endaddr < bb->addr &&
					   bb->addr - endaddr < anal->opt.bbs_alignment &&
					   !(bb->addr & (anal->opt.bbs_alignment - 1))) {
				endaddr = bb->addr + bb->size;
			} else break;
		}
		r_anal_fcn_resize (fcn, endaddr - fcn->addr);

		// resize function if overlaps
		r_list_foreach (anal->fcns, iter, fcn1) {
			if (fcn1->addr >= (fcn->addr) &&
				fcn1->addr < (fcn->addr + fcn->size))
					if (overlapped > fcn1->addr)
						overlapped = fcn1->addr;
		}
		if (overlapped != -1) r_anal_fcn_resize (fcn, overlapped - fcn->addr);
		r_anal_trim_jmprefs (fcn);
	}
	return ret;
}

// TODO: need to implement r_anal_fcn_remove(RAnal *anal, RAnalFunction *fcn);
R_API int r_anal_fcn_insert(RAnal *anal, RAnalFunction *fcn) {
	RAnalFunction *f = r_anal_get_fcn_in (anal, fcn->addr,
		R_ANAL_FCN_TYPE_ROOT);
	if (f) return false;
#if USE_NEW_FCN_STORE
	r_listrange_add (anal->fcnstore, fcn);
	// HUH? store it here .. for backweird compatibility
#endif
	/* TODO: sdbization */
	r_list_append (anal->fcns, fcn);
	if (anal->cb.on_fcn_new) {
		anal->cb.on_fcn_new (anal, anal->user, fcn);
	}
	return true;
}

R_API int r_anal_fcn_add(RAnal *a, ut64 addr, ut64 size, const char *name, int type, RAnalDiff *diff) {
	int append = 0;
	RAnalFunction *fcn;

	if (size < 1) return false;

	fcn = r_anal_get_fcn_in (a, addr, R_ANAL_FCN_TYPE_ROOT);
	if (fcn == NULL) {
		if (!(fcn = r_anal_fcn_new ()))
			return false;
		append = 1;
	}
	fcn->addr = addr;
	fcn->size = size;
	free (fcn->name);
	if (!name) {
		fcn->name = r_str_newf ("fcn.%08"PFMT64x, fcn->addr);
	} else {
		fcn->name = strdup (name);
	}
	fcn->type = type;
	if (diff) {
		fcn->diff->type = diff->type;
		fcn->diff->addr = diff->addr;
		R_FREE (fcn->diff->name);
		if (diff->name)
			fcn->diff->name = strdup (diff->name);
	}
#if FCN_SDB
	sdb_set (DB, sdb_fmt (0, "fcn.0x%08"PFMT64x, addr), "TODO", 0); // TODO: add more info here
#endif
	return append? r_anal_fcn_insert (a, fcn): true;
}

R_API int r_anal_fcn_del_locs(RAnal *anal, ut64 addr) {
	RListIter *iter, *iter2;
	RAnalFunction *fcn, *f = r_anal_get_fcn_in (anal, addr,
		R_ANAL_FCN_TYPE_ROOT);
#if USE_NEW_FCN_STORE
#warning TODO: r_anal_fcn_del_locs not implemented for newstore
#endif
	if (!f) return false;
	r_list_foreach_safe (anal->fcns, iter, iter2, fcn) {
		if (fcn->type != R_ANAL_FCN_TYPE_LOC)
			continue;
		if (fcn->addr >= f->addr && fcn->addr < (f->addr+f->size))
			r_list_delete (anal->fcns, iter);
	}
	r_anal_fcn_del (anal, addr);
	return true;
}

R_API int r_anal_fcn_del(RAnal *a, ut64 addr) {
	if (addr == UT64_MAX) {
#if USE_NEW_FCN_STORE
		r_listrange_free (a->fcnstore);
		a->fcnstore = r_listrange_new ();
#else
		r_list_free (a->fcns);
		if (!(a->fcns = r_anal_fcn_list_new ()))
			return false;
#endif
	} else {
#if USE_NEW_FCN_STORE
		// XXX: must only get the function if starting at 0?
		RAnalFunction *f = r_listrange_find_in_range (a->fcnstore, addr);
		if (f) r_listrange_del (a->fcnstore, f);
#else
		RAnalFunction *fcni;
		RListIter *iter, *iter_tmp;
		r_list_foreach_safe (a->fcns, iter, iter_tmp, fcni) {
			if (addr >= fcni->addr && addr < fcni->addr+fcni->size) {
				if (a->cb.on_fcn_delete) {
					a->cb.on_fcn_delete (a, a->user, fcni);
				}
				r_list_delete (a->fcns, iter);
			}
		}
#endif
	}
	return true;
}

R_API RAnalFunction *r_anal_get_fcn_in(RAnal *anal, ut64 addr, int type) {
#if USE_NEW_FCN_STORE
	// TODO: type is ignored here? wtf.. we need more work on fcnstore
	//if (root) return r_listrange_find_root (anal->fcnstore, addr);
	return r_listrange_find_in_range (anal->fcnstore, addr);
#else
	RAnalFunction *fcn, *ret = NULL;
	RListIter *iter;
	if (type == R_ANAL_FCN_TYPE_ROOT) {
		r_list_foreach (anal->fcns, iter, fcn) {
			if (addr == fcn->addr)
				return fcn;
		}
		return NULL;
	}
	r_list_foreach (anal->fcns, iter, fcn) {
		if (!type || (fcn && fcn->type & type)) {
			if (addr == fcn->addr ||
			    (ret == NULL && ((addr > fcn->addr) &&
			    (addr < fcn->addr + fcn->size))))
				ret = fcn;

		}
	}
	return ret;
#endif
}

R_API RAnalFunction *r_anal_fcn_find_name(RAnal *anal, const char *name) {
	RAnalFunction *fcn = NULL;
	RListIter *iter;
	r_list_foreach (anal->fcns, iter, fcn) {
		if (!strcmp (name, fcn->name))
			return fcn;
	}
	return NULL;
}

/* rename RAnalFunctionBB.add() */
R_API int r_anal_fcn_add_bb(RAnal *anal, RAnalFunction *fcn, ut64 addr, ut64 size, ut64 jump, ut64 fail, int type, RAnalDiff *diff) {
	RAnalBlock *bb = NULL, *bbi;
	RListIter *iter;
	int mid = 0;

	r_list_foreach (fcn->bbs, iter, bbi) {
		if (addr == bbi->addr) {
			bb = bbi;
			mid = 0;
			break;
		} else if ((addr > bbi->addr) && (addr < bbi->addr+bbi->size)) {
			mid = 1;
		}
	}
	if (mid) {
		//eprintf ("Basic Block overlaps another one that should be shrinked\n");
		if (bbi) {
			/* shrink overlapped basic block */
			bbi->size = addr - (bbi->addr);
		}
	}
	if (bb == NULL) {
		bb = appendBasicBlock (anal, fcn, addr);
		if (!bb) {
			eprintf ("appendBasicBlock failed\n");
			return false;
		}
	}
	bb->addr = addr;
	bb->size = size;
	bb->jump = jump;
	bb->fail = fail;
	bb->type = type;
	if (diff) {
		bb->diff->type = diff->type;
		bb->diff->addr = diff->addr;
		R_FREE (bb->diff->name);
		if (diff->name)
			bb->diff->name = strdup (diff->name);
	}
	return true;
}

// TODO: rename fcn_bb_split()
// bb seems to be ignored
R_API int r_anal_fcn_split_bb(RAnal *anal, RAnalFunction *fcn, RAnalBlock *bb, ut64 addr) {
	RAnalBlock *bbi;
#if R_ANAL_BB_HAS_OPS
	RAnalOp *opi;
#endif
	RListIter *iter;
	if (addr == UT64_MAX)
		return 0;

	r_list_foreach (fcn->bbs, iter, bbi) {
		if (addr == bbi->addr) return R_ANAL_RET_DUP;

		if (addr > bbi->addr && addr < bbi->addr + bbi->size) {
			int new_bbi_instr, i;

			bb = appendBasicBlock (anal, fcn, addr);
			bb->size = bbi->addr + bbi->size - addr;
			bb->jump = bbi->jump;
			bb->fail = bbi->fail;
			bb->conditional = bbi->conditional;

			bbi->size = addr - bbi->addr;
			bbi->jump = addr;
			bbi->fail = -1;
			bbi->conditional = false;
			if (bbi->type & R_ANAL_BB_TYPE_HEAD) {
				bb->type = bbi->type ^ R_ANAL_BB_TYPE_HEAD;
				bbi->type = R_ANAL_BB_TYPE_HEAD;
			} else {
				bb->type = bbi->type;
				bbi->type = R_ANAL_BB_TYPE_BODY;
			}

			// recalculate offset of instructions in both bb and bbi
			i = 0;
			while (i < bbi->ninstr && r_anal_bb_offset_inst (bbi, i) < bbi->size) i++;
			new_bbi_instr = i;
			if (bb->addr - bbi->addr == r_anal_bb_offset_inst (bbi, i)) {
				bb->ninstr = 0;
				while (i < bbi->ninstr) {
					ut16 off_op = r_anal_bb_offset_inst (bbi, i);
					if (off_op >= bbi->size + bb->size) break;
					r_anal_bb_set_offset (bb, bb->ninstr, off_op - bbi->size);
					bb->ninstr++;
					i++;
				}
			}
			bbi->ninstr = new_bbi_instr;
#if R_ANAL_BB_HAS_OPS
			if (bbi->ops) {
				r_list_foreach (bbi->ops, iter, opi) {
					if (opi->addr >= addr) {
						/* Remove opi from bbi->ops without free()ing it. */
						r_list_split (bbi->ops, opi);
						bbi->ninstr--;
						r_list_append (bb->ops, opi);
						bb->ninstr++;
					}
				}
			}
#endif
			return R_ANAL_RET_END;
		}
	}
	return R_ANAL_RET_NEW;
}

// TODO: rename fcn_bb_overlap()
R_API int r_anal_fcn_bb_overlaps(RAnalFunction *fcn, RAnalBlock *bb) {
	RAnalBlock *bbi;
	RListIter *iter;
#if R_ANAL_BB_HAS_OPS
	RListIter *iter_tmp;
	RAnalOp *opi;
#endif
	r_list_foreach (fcn->bbs, iter, bbi)
		if (bb->addr+bb->size > bbi->addr && bb->addr+bb->size <= bbi->addr+bbi->size) {
			bb->size = bbi->addr - bb->addr;
			bb->jump = bbi->addr;
			bb->fail = -1;
			bb->conditional = false;
			if (bbi->type & R_ANAL_BB_TYPE_HEAD) {
				bb->type = R_ANAL_BB_TYPE_HEAD;
				bbi->type = bbi->type^R_ANAL_BB_TYPE_HEAD;
			} else bb->type = R_ANAL_BB_TYPE_BODY;
#if R_ANAL_BB_HAS_OPS
			/* We can reuse iter because we return before the outer loop. */
			r_list_foreach_safe (bb->ops, iter, iter_tmp, opi) {
				if (opi->addr >= bbi->addr) {
					r_list_delete (bb->ops, iter);
				}
			}
#endif
			r_list_append (fcn->bbs, bb);
			return R_ANAL_RET_END;
		}
	return R_ANAL_RET_NEW;
}

R_API int r_anal_fcn_cc(RAnalFunction *fcn) {
/*
    CC = E - N + 2P
    E = the number of edges of the graph.
    N = the number of nodes of the graph.
    P = the number of connected components (exit nodes).
*/
	int E = 0, N = 0, P = 0;
	RListIter *iter;
	RAnalBlock *bb;

	r_list_foreach (fcn->bbs, iter, bb) {
		N++; // nodes
		if (bb->jump == UT64_MAX) {
			P++; // exit nodes
		} else {
			E++; // edges
			if (bb->fail != UT64_MAX)
				E++;
		}
	}
	return E-N+(2*P);
}

R_API char *r_anal_fcn_to_string(RAnal *a, RAnalFunction* fs) {
	return NULL;
}

// TODO: This function is not fully implemented
/* set function signature from string */
R_API int r_anal_str_to_fcn(RAnal *a, RAnalFunction *f, const char *sig) {
	char *str; //*p, *q, *r

	if (!a || !f || !sig) {
		eprintf ("r_anal_str_to_fcn: No function received\n");
		return false;
	}

	/* Add 'function' keyword */
	str = malloc(strlen(sig) + 10);
	strcpy(str, "function ");
	strcat(str, sig);

	/* TODO: improve arguments parsing */
	/* TODO: implement parser */
	/* TODO: simplify this complex api usage */

	free (str);
	return true;
}

R_API RAnalFunction *r_anal_get_fcn_at(RAnal *anal, ut64 addr, int type) {
#if USE_NEW_FCN_STORE
	// TODO: type is ignored here? wtf.. we need more work on fcnstore
	//if (root) return r_listrange_find_root (anal->fcnstore, addr);
	return r_listrange_find_root (anal->fcnstore, addr);
#else
	RAnalFunction *fcn, *ret = NULL;
	RListIter *iter;
	if (type == R_ANAL_FCN_TYPE_ROOT) {
		r_list_foreach (anal->fcns, iter, fcn) {
			if (addr == fcn->addr)
				return fcn;
		}
		return NULL;
	}
	r_list_foreach (anal->fcns, iter, fcn) {
		if (!type || (fcn->type & type)) {
			if (addr == fcn->addr)
				ret = fcn;
		}
	}
	return ret;
#endif
}

R_API RAnalFunction *r_anal_fcn_next(RAnal *anal, ut64 addr) {
	RAnalFunction *fcni;
	RListIter *iter;
	RAnalFunction *closer = NULL;
	r_list_foreach (anal->fcns, iter, fcni) {
		//if (fcni->addr == addr)
		if (fcni->addr > addr && (!closer || fcni->addr<closer->addr)) {
			closer = fcni;
		}
	}
	return closer;
}

/* getters */
#if FCN_OLD
R_API RList* r_anal_fcn_get_refs (RAnalFunction *anal) { return anal->refs; }
R_API RList* r_anal_fcn_get_xrefs (RAnalFunction *anal) { return anal->xrefs; }
R_API RList* r_anal_fcn_get_vars (RAnalFunction *anal) { return anal->vars; }
#endif

R_API RList* r_anal_fcn_get_bbs (RAnalFunction *anal) {
	// avoid received to free this thing
	anal->bbs->free = NULL;
	return anal->bbs;
}

R_API int r_anal_fcn_is_in_offset (RAnalFunction *fcn, ut64 addr) {
	return (addr >= fcn->addr &&  addr < (fcn->addr+fcn->size));
}

R_API int r_anal_fcn_count (RAnal *anal, ut64 from, ut64 to) {
	int n = 0;
	RAnalFunction *fcni;
	RListIter *iter;
	r_list_foreach (anal->fcns, iter, fcni)
		if (fcni->addr >= from && fcni->addr < to)
			return n++;
	return n;
}