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/*
* HT Editor
* analy_java.cc
*
* Copyright (C) 1999-2002 Sebastian Biallas (sb@biallas.net)
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License version 2 as
* published by the Free Software Foundation.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
*/
#include <string.h>
#include "analy_register.h"
#include "analy_java.h"
#include "htdebug.h"
#include "javadis.h"
#include "strtools.h"
#include "snprintf.h"
void AnalyJavaDisassembler::init(Analyser *A, java_token_func token_func, void *context)
{
disasm = new javadis(token_func, context);
AnalyDisassembler::init(A);
}
/*
*
*/
ObjectID AnalyJavaDisassembler::getObjectID() const
{
return ATOM_ANALY_JAVA;
}
/*
*
*/
Address *AnalyJavaDisassembler::branchAddr(OPCODE *opcode, branch_enum_t branchtype, bool examine)
{
javadis_insn *o = (javadis_insn*)opcode;
switch (o->op[0].type) {
case JAVA_OPTYPE_LABEL:
return new AddressFlat32(o->op[0].label);
}
return new InvalidAddress();
}
static uint32 read4(Analyser *a, Address &addr, byte *b)
{
if (a->bufPtr(&addr, b, 4) != 4) throw 1;
addr.add(4);
return (b[0]<<24) | (b[1]<<16) | (b[2]<<8) | b[3];
}
void AnalyJavaDisassembler::examineOpcode(OPCODE *opcode)
{
javadis_insn *o = (javadis_insn*)opcode;
const char *opcode_str = o->name;
if (strcmp("lookupswitch", opcode_str) == 0) {
uint32 ofs = o->addr;
AddressFlat32 c(ofs);
Location *loc = analy->getFunctionByAddress(&c);
if (loc) {
AddressFlat32 *func = (AddressFlat32 *)loc->addr;
uint32 f = func->addr;
ofs = ofs+1 - f;
while (ofs % 4) {
AddressFlat32 iofs(f+ofs);
analy->data->setIntAddressType(&iofs, dst_ibyte, 1);
ofs++;
}
AddressFlat32 iofs(f + ofs);
byte buf[4];
try {
analy->data->setIntAddressType(&iofs, dst_idword, 4);
uint32 default_ofs = read4(analy, iofs, buf);
analy->data->setIntAddressType(&iofs, dst_idword, 4);
uint32 n = read4(analy, iofs, buf);
for (uint32 i=0; i < n; i++) {
char buffer[100];
analy->data->setIntAddressType(&iofs, dst_idword, 4);
uint32 value = read4(analy, iofs, buf);
analy->data->setIntAddressType(&iofs, dst_idword, 4);
uint32 rel_ofs = read4(analy, iofs, buf);
AddressFlat32 a(o->addr + rel_ofs);
if (!analy->getLocationByAddress(&a)) analy->addComment(&a, 0, "");
ht_snprintf(buffer, sizeof buffer, "lookupswitch value: %d", value);
analy->addComment(&a, 0, buffer);
analy->addAddressSymbol(&a, "lookup", label_loc, loc);
analy->pushAddress(&a, func);
analy->addXRef(&a, &c, xrefijump);
}
AddressFlat32 a(o->addr + default_ofs);
analy->addComment(&a, 0, "");
analy->addComment(&a, 0, "lookupswitch default");
analy->addAddressSymbol(&a, "lookup", label_loc, loc);
analy->pushAddress(&a, func);
analy->addXRef(&a, &c, xrefijump);
} catch (...) {
return;
}
}
} else if (strcmp("tableswitch", opcode_str) == 0) {
uint32 ofs = o->addr;
AddressFlat32 c(ofs);
Location *loc = analy->getFunctionByAddress(&c);
if (loc) {
AddressFlat32 *func = (AddressFlat32 *)loc->addr;
uint32 f = func->addr;
ofs = ofs+1 - f;
while (ofs % 4) {
AddressFlat32 iofs(f+ofs);
analy->data->setIntAddressType(&iofs, dst_ibyte, 1);
ofs++;
}
AddressFlat32 iofs(f + ofs);
byte buf[4];
try {
analy->data->setIntAddressType(&iofs, dst_idword, 4);
uint32 default_ofs = read4(analy, iofs, buf);
analy->data->setIntAddressType(&iofs, dst_idword, 4);
sint32 low = read4(analy, iofs, buf);
analy->data->setIntAddressType(&iofs, dst_idword, 4);
sint32 high = read4(analy, iofs, buf);
for (sint32 i=low; i <= high; i++) {
char buffer[100];
analy->data->setIntAddressType(&iofs, dst_idword, 4);
uint32 rel_ofs = read4(analy, iofs, buf);
AddressFlat32 a(o->addr + rel_ofs);
if (!analy->getLocationByAddress(&a)) analy->addComment(&a, 0, "");
ht_snprintf(buffer, sizeof buffer, "tableswitch value: %d", i);
analy->addComment(&a, 0, buffer);
analy->addAddressSymbol(&a, "table", label_loc, loc);
analy->pushAddress(&a, func);
analy->addXRef(&a, &c, xrefijump);
}
AddressFlat32 a(o->addr + default_ofs);
analy->addComment(&a, 0, "");
analy->addComment(&a, 0, "tableswitch default");
analy->addAddressSymbol(&a, "table", label_loc, loc);
analy->pushAddress(&a, func);
analy->addXRef(&a, &c, xrefijump);
} catch (...) {
return;
}
}
}
}
/*
*
*/
branch_enum_t AnalyJavaDisassembler::isBranch(OPCODE *opcode)
{
javadis_insn *o = (javadis_insn*)opcode;
const char *opcode_str = o->name;
if ((opcode_str[0]=='i') && (opcode_str[1]=='f')) {
return br_jXX;
} else if ((strcmp("tableswitch", opcode_str)==0)
|| (strcmp("lookupswitch", opcode_str)==0)) {
examineOpcode(opcode);
return br_jump;
} else if (ht_strncmp("ret", opcode_str, 3)==0
|| ht_strncmp("ret", opcode_str+1, 3)==0
|| ht_strncmp("athrow", opcode_str, 6)==0) {
return br_return;
} else if (ht_strncmp("goto", opcode_str, 4)==0) {
return br_jump;
} else if (ht_strncmp("jsr", opcode_str, 3)==0) {
return br_call;
} else return br_nobranch;
}
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