hotspot/src/share/tools/hsdis/hsdis-demo.c
author mchung
Wed, 10 Feb 2010 17:51:07 -0800
changeset 4917 c98da2209f8c
parent 3261 c7d5aae8d3f7
child 5547 f4b087cbb361
permissions -rw-r--r--
6915413: Module build: building of specified jdk components instead of all Summary: Define new SUBDIRS_* variables for specifying components for one group Reviewed-by: ohair
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/*
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 * Copyright 2008-2009 Sun Microsystems, Inc.  All Rights Reserved.
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 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
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 *
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 * This code is free software; you can redistribute it and/or modify it
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 * under the terms of the GNU General Public License version 2 only, as
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 * published by the Free Software Foundation.
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 *
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 * This code is distributed in the hope that it will be useful, but WITHOUT
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 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
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 * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
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 * version 2 for more details (a copy is included in the LICENSE file that
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 * accompanied this code).
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 *
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 * You should have received a copy of the GNU General Public License version
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 * 2 along with this work; if not, write to the Free Software Foundation,
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 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
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 *
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 * Please contact Sun Microsystems, Inc., 4150 Network Circle, Santa Clara,
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 * CA 95054 USA or visit www.sun.com if you need additional information or
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 * have any questions.
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 *
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 */
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/* hsdis-demo.c -- dump a range of addresses as native instructions
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   This demonstrates the protocol required by the HotSpot PrintAssembly option.
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*/
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#include "hsdis.h"
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#include "stdio.h"
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#include "stdlib.h"
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#include "string.h"
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void greet(const char*);
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void disassemble(void*, void*);
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void end_of_file();
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const char* options = NULL;
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int         raw     = 0;
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int         xml     = 0;
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int main(int ac, char** av) {
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  int greeted = 0;
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  int i;
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  for (i = 1; i < ac; i++) {
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    const char* arg = av[i];
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    if (arg[0] == '-') {
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      if (!strcmp(arg, "-xml"))
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        xml ^= 1;
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      else if (!strcmp(arg, "-raw"))
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        raw ^= 1;
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      else if (!strncmp(arg, "-options=", 9))
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        options = arg+9;
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      else
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        { printf("Usage: %s [-xml] [name...]\n", av[0]); exit(2); }
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      continue;
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    }
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    greet(arg);
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    greeted = 1;
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  }
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  if (!greeted)
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    greet("world");
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  printf("...And now for something completely different:\n");
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  disassemble((void*) &main, (void*) &end_of_file);
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  printf("Cheers!\n");
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}
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void greet(const char* whom) {
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  printf("Hello, %s!\n", whom);
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}
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void end_of_file() { }
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/* don't disassemble after this point... */
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#include "dlfcn.h"
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#define DECODE_INSTRUCTIONS_NAME "decode_instructions"
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#define HSDIS_NAME               "hsdis"
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static void* decode_instructions_pv = 0;
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static const char* hsdis_path[] = {
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  HSDIS_NAME"-"LIBARCH LIB_EXT,
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  "./" HSDIS_NAME"-"LIBARCH LIB_EXT,
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#ifdef TARGET_DIR
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  TARGET_DIR"/"HSDIS_NAME"-"LIBARCH LIB_EXT,
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#endif
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  NULL
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};
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static const char* load_decode_instructions() {
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  void* dllib = NULL;
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  const char* *next_in_path = hsdis_path;
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  while (1) {
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    decode_instructions_pv = dlsym(dllib, DECODE_INSTRUCTIONS_NAME);
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    if (decode_instructions_pv != NULL)
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      return NULL;
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    if (dllib != NULL)
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      return "plugin does not defined "DECODE_INSTRUCTIONS_NAME;
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    for (dllib = NULL; dllib == NULL; ) {
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      const char* next_lib = (*next_in_path++);
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      if (next_lib == NULL)
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        return "cannot find plugin "HSDIS_NAME LIB_EXT;
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      dllib = dlopen(next_lib, RTLD_LAZY);
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    }
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  }
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}
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static const char* lookup(void* addr) {
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#define CHECK_NAME(fn) \
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  if (addr == (void*) &fn)  return #fn;
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  CHECK_NAME(main);
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  CHECK_NAME(greet);
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  return NULL;
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}
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/* does the event match the tag, followed by a null, space, or slash? */
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#define MATCH(event, tag) \
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  (!strncmp(event, tag, sizeof(tag)-1) && \
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   (!event[sizeof(tag)-1] || strchr(" /", event[sizeof(tag)-1])))
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static const char event_cookie[] = "event_cookie"; /* demo placeholder */
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static void* handle_event(void* cookie, const char* event, void* arg) {
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#define NS_DEMO "demo:"
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  if (cookie != event_cookie)
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    printf("*** bad event cookie %p != %p\n", cookie, event_cookie);
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  if (xml) {
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    /* We could almost do a printf(event, arg),
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       but for the sake of a better demo,
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       we dress the result up as valid XML.
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    */
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    const char* fmt = strchr(event, ' ');
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    int evlen = (fmt ? fmt - event : strlen(event));
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    if (!fmt) {
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      if (event[0] != '/') {
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        printf("<"NS_DEMO"%.*s>", evlen, event);
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      } else {
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        printf("</"NS_DEMO"%.*s>", evlen-1, event+1);
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      }
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    } else {
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      if (event[0] != '/') {
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        printf("<"NS_DEMO"%.*s", evlen, event);
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        printf(fmt, arg);
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        printf(">");
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      } else {
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        printf("<"NS_DEMO"%.*s_done", evlen-1, event+1);
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        printf(fmt, arg);
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        printf("/></"NS_DEMO"%.*s>", evlen-1, event+1);
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      }
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    }
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  }
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  if (MATCH(event, "insn")) {
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    const char* name = lookup(arg);
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    if (name)  printf("%s:\n", name);
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    /* basic action for <insn>: */
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    printf(" %p\t", arg);
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  } else if (MATCH(event, "/insn")) {
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    /* basic action for </insn>:
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       (none, plugin puts the newline for us
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    */
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  } else if (MATCH(event, "mach")) {
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    printf("Decoding for CPU '%s'\n", (char*) arg);
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  } else if (MATCH(event, "addr")) {
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    /* basic action for <addr/>: */
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    const char* name = lookup(arg);
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    if (name) {
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      printf("&%s (%p)", name, arg);
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      /* return non-null to notify hsdis not to print the addr */
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      return arg;
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    }
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  }
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  /* null return is always safe; can mean "I ignored it" */
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  return NULL;
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}
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#define fprintf_callback \
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  (decode_instructions_printf_callback_ftype)&fprintf
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void disassemble(void* from, void* to) {
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  const char* err = load_decode_instructions();
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  if (err != NULL) {
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    printf("%s: %s\n", err, dlerror());
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    exit(1);
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  }
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  printf("Decoding from %p to %p...\n", from, to);
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  decode_instructions_ftype decode_instructions
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    = (decode_instructions_ftype) decode_instructions_pv;
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  void* res;
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  if (raw && xml) {
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    res = (*decode_instructions)(from, to, NULL, stdout, NULL, stdout, options);
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  } else if (raw) {
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    res = (*decode_instructions)(from, to, NULL, NULL, NULL, stdout, options);
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  } else {
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    res = (*decode_instructions)(from, to,
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                                 handle_event, (void*) event_cookie,
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                                 fprintf_callback, stdout,
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                                 options);
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  }
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  if (res != to)
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    printf("*** Result was %p!\n", res);
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}