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/*
* Copyright (c) 2008, 2010, Oracle and/or its affiliates. All rights reserved.
* DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
*
* This code is free software; you can redistribute it and/or modify it
* under the terms of the GNU General Public License version 2 only, as
* published by the Free Software Foundation.
*
* This code 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
* version 2 for more details (a copy is included in the LICENSE file that
* accompanied this code).
*
* You should have received a copy of the GNU General Public License version
* 2 along with this work; if not, write to the Free Software Foundation,
* Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
*
* Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
* or visit www.oracle.com if you need additional information or have any
* questions.
*
*/
#include "precompiled.hpp"
/* hsdis-demo.c -- dump a range of addresses as native instructions
This demonstrates the protocol required by the HotSpot PrintAssembly option.
*/
#include "hsdis.h"
#include "stdio.h"
#include "stdlib.h"
#include "string.h"
void greet(const char*);
void disassemble(void*, void*);
void end_of_file();
const char* options = NULL;
int raw = 0;
int xml = 0;
int main(int ac, char** av) {
int greeted = 0;
int i;
for (i = 1; i < ac; i++) {
const char* arg = av[i];
if (arg[0] == '-') {
if (!strcmp(arg, "-xml"))
xml ^= 1;
else if (!strcmp(arg, "-raw"))
raw ^= 1;
else if (!strncmp(arg, "-options=", 9))
options = arg+9;
else
{ printf("Usage: %s [-xml] [name...]\n", av[0]); exit(2); }
continue;
}
greet(arg);
greeted = 1;
}
if (!greeted)
greet("world");
printf("...And now for something completely different:\n");
disassemble((void*) &main, (void*) &end_of_file);
printf("Cheers!\n");
}
void greet(const char* whom) {
printf("Hello, %s!\n", whom);
}
void end_of_file() { }
/* don't disassemble after this point... */
#include "dlfcn.h"
#define DECODE_INSTRUCTIONS_NAME "decode_instructions"
#define HSDIS_NAME "hsdis"
static void* decode_instructions_pv = 0;
static const char* hsdis_path[] = {
HSDIS_NAME"-"LIBARCH LIB_EXT,
"./" HSDIS_NAME"-"LIBARCH LIB_EXT,
#ifdef TARGET_DIR
TARGET_DIR"/"HSDIS_NAME"-"LIBARCH LIB_EXT,
#endif
NULL
};
static const char* load_decode_instructions() {
void* dllib = NULL;
const char* *next_in_path = hsdis_path;
while (1) {
decode_instructions_pv = dlsym(dllib, DECODE_INSTRUCTIONS_NAME);
if (decode_instructions_pv != NULL)
return NULL;
if (dllib != NULL)
return "plugin does not defined "DECODE_INSTRUCTIONS_NAME;
for (dllib = NULL; dllib == NULL; ) {
const char* next_lib = (*next_in_path++);
if (next_lib == NULL)
return "cannot find plugin "HSDIS_NAME LIB_EXT;
dllib = dlopen(next_lib, RTLD_LAZY);
}
}
}
static const char* lookup(void* addr) {
#define CHECK_NAME(fn) \
if (addr == (void*) &fn) return #fn;
CHECK_NAME(main);
CHECK_NAME(greet);
return NULL;
}
/* does the event match the tag, followed by a null, space, or slash? */
#define MATCH(event, tag) \
(!strncmp(event, tag, sizeof(tag)-1) && \
(!event[sizeof(tag)-1] || strchr(" /", event[sizeof(tag)-1])))
static const char event_cookie[] = "event_cookie"; /* demo placeholder */
static void* handle_event(void* cookie, const char* event, void* arg) {
#define NS_DEMO "demo:"
if (cookie != event_cookie)
printf("*** bad event cookie %p != %p\n", cookie, event_cookie);
if (xml) {
/* We could almost do a printf(event, arg),
but for the sake of a better demo,
we dress the result up as valid XML.
*/
const char* fmt = strchr(event, ' ');
int evlen = (fmt ? fmt - event : strlen(event));
if (!fmt) {
if (event[0] != '/') {
printf("<"NS_DEMO"%.*s>", evlen, event);
} else {
printf("</"NS_DEMO"%.*s>", evlen-1, event+1);
}
} else {
if (event[0] != '/') {
printf("<"NS_DEMO"%.*s", evlen, event);
printf(fmt, arg);
printf(">");
} else {
printf("<"NS_DEMO"%.*s_done", evlen-1, event+1);
printf(fmt, arg);
printf("/></"NS_DEMO"%.*s>", evlen-1, event+1);
}
}
}
if (MATCH(event, "insn")) {
const char* name = lookup(arg);
if (name) printf("%s:\n", name);
/* basic action for <insn>: */
printf(" %p\t", arg);
} else if (MATCH(event, "/insn")) {
/* basic action for </insn>:
(none, plugin puts the newline for us
*/
} else if (MATCH(event, "mach")) {
printf("Decoding for CPU '%s'\n", (char*) arg);
} else if (MATCH(event, "addr")) {
/* basic action for <addr/>: */
const char* name = lookup(arg);
if (name) {
printf("&%s (%p)", name, arg);
/* return non-null to notify hsdis not to print the addr */
return arg;
}
}
/* null return is always safe; can mean "I ignored it" */
return NULL;
}
#define fprintf_callback \
(decode_instructions_printf_callback_ftype)&fprintf
void disassemble(void* from, void* to) {
const char* err = load_decode_instructions();
if (err != NULL) {
printf("%s: %s\n", err, dlerror());
exit(1);
}
printf("Decoding from %p to %p...\n", from, to);
decode_instructions_ftype decode_instructions
= (decode_instructions_ftype) decode_instructions_pv;
void* res;
if (raw && xml) {
res = (*decode_instructions)(from, to, NULL, stdout, NULL, stdout, options);
} else if (raw) {
res = (*decode_instructions)(from, to, NULL, NULL, NULL, stdout, options);
} else {
res = (*decode_instructions)(from, to,
handle_event, (void*) event_cookie,
fprintf_callback, stdout,
options);
}
if (res != to)
printf("*** Result was %p!\n", res);
}
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