Mercurial > jdk8-mips64-public > hotspot / file revision

 /*

  * Copyright (c) 2008, 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 "incls/_precompiled.incl"

 # include "incls/_disassembler.cpp.incl"

 void*       Disassembler::_library               = NULL;

 bool        Disassembler::_tried_to_load_library = false;

 // This routine is in the shared library:

 Disassembler::decode_func Disassembler::_decode_instructions = NULL;

 static const char hsdis_library_name[] = "hsdis-"HOTSPOT_LIB_ARCH;

 static const char decode_instructions_name[] = "decode_instructions";

 #define COMMENT_COLUMN  40 LP64_ONLY(+8) /*could be an option*/

 #define BYTES_COMMENT   ";..."  /* funky byte display comment */

 bool Disassembler::load_library() {

   if (_decode_instructions != NULL) {

     // Already succeeded.

     return true;

   }

   if (_tried_to_load_library) {

     // Do not try twice.

     // To force retry in debugger: assign _tried_to_load_library=0

     return false;

   }

   // Try to load it.

   char ebuf[1024];

   char buf[JVM_MAXPATHLEN];

   os::jvm_path(buf, sizeof(buf));

   int jvm_offset = -1;

   {

     // Match "jvm[^/]*" in jvm_path.

     const char* base = buf;

     const char* p = strrchr(buf, '/');

     p = strstr(p ? p : base, "jvm");

     if (p != NULL)  jvm_offset = p - base;

   }

   if (jvm_offset >= 0) {

     // Find the disassembler next to libjvm.so.

     strcpy(&buf[jvm_offset], hsdis_library_name);

     strcat(&buf[jvm_offset], os::dll_file_extension());

     _library = hpi::dll_load(buf, ebuf, sizeof ebuf);

   }

   if (_library == NULL) {

     // Try a free-floating lookup.

     strcpy(&buf[0], hsdis_library_name);

     strcat(&buf[0], os::dll_file_extension());

     _library = hpi::dll_load(buf, ebuf, sizeof ebuf);

   }

   if (_library != NULL) {

     _decode_instructions = CAST_TO_FN_PTR(Disassembler::decode_func,

                                           hpi::dll_lookup(_library, decode_instructions_name));

   }

   _tried_to_load_library = true;

   if (_decode_instructions == NULL) {

     tty->print_cr("Could not load %s; %s; %s", buf,

                   ((_library != NULL)

                    ? "entry point is missing"

                    : (WizardMode || PrintMiscellaneous)

                    ? (const char*)ebuf

                    : "library not loadable"),

                   "PrintAssembly is disabled");

     return false;

   }

   // Success.

   tty->print_cr("Loaded disassembler from %s", buf);

   return true;

 }

 class decode_env {

  private:

   nmethod*      _nm;

   CodeBlob*     _code;

   outputStream* _output;

   address       _start, _end;

   char          _option_buf[512];

   char          _print_raw;

   bool          _print_pc;

   bool          _print_bytes;

   address       _cur_insn;

   int           _total_ticks;

   int           _bytes_per_line; // arch-specific formatting option

   static bool match(const char* event, const char* tag) {

     size_t taglen = strlen(tag);

     if (strncmp(event, tag, taglen) != 0)

       return false;

     char delim = event[taglen];

     return delim == '\0' || delim == ' ' || delim == '/' || delim == '=';

   }

   void collect_options(const char* p) {

     if (p == NULL || p[0] == '\0')  return;

     size_t opt_so_far = strlen(_option_buf);

     if (opt_so_far + 1 + strlen(p) + 1 > sizeof(_option_buf))  return;

     char* fillp = &_option_buf[opt_so_far];

     if (opt_so_far > 0) *fillp++ = ',';

     strcat(fillp, p);

     // replace white space by commas:

     char* q = fillp;

     while ((q = strpbrk(q, " \t\n")) != NULL)

       *q++ = ',';

     // Note that multiple PrintAssemblyOptions flags accumulate with \n,

     // which we want to be changed to a comma...

   }

   void print_insn_labels();

   void print_insn_bytes(address pc0, address pc);

   void print_address(address value);

  public:

   decode_env(CodeBlob* code, outputStream* output);

   address decode_instructions(address start, address end);

   void start_insn(address pc) {

     _cur_insn = pc;

     output()->bol();

     print_insn_labels();

   }

   void end_insn(address pc) {

     address pc0 = cur_insn();

     outputStream* st = output();

     if (_print_bytes && pc > pc0)

       print_insn_bytes(pc0, pc);

     if (_nm != NULL) {

       _nm->print_code_comment_on(st, COMMENT_COLUMN, pc0, pc);

       // this calls reloc_string_for which calls oop::print_value_on

     }

     // Output pc bucket ticks if we have any

     if (total_ticks() != 0) {

       address bucket_pc = FlatProfiler::bucket_start_for(pc);

       if (bucket_pc != NULL && bucket_pc > pc0 && bucket_pc <= pc) {

         int bucket_count = FlatProfiler::bucket_count_for(pc0);

         if (bucket_count != 0) {

           st->bol();

           st->print_cr("%3.1f%% [%d]", bucket_count*100.0/total_ticks(), bucket_count);

         }

       }

     }

   }

   address handle_event(const char* event, address arg);

   outputStream* output() { return _output; }

   address cur_insn() { return _cur_insn; }

   int total_ticks() { return _total_ticks; }

   void set_total_ticks(int n) { _total_ticks = n; }

   const char* options() { return _option_buf; }

 };

 decode_env::decode_env(CodeBlob* code, outputStream* output) {

   memset(this, 0, sizeof(*this));

   _output = output ? output : tty;

   _code = code;

   if (code != NULL && code->is_nmethod())

     _nm = (nmethod*) code;

   // by default, output pc but not bytes:

   _print_pc       = true;

   _print_bytes    = false;

   _bytes_per_line = Disassembler::pd_instruction_alignment();

   // parse the global option string:

   collect_options(Disassembler::pd_cpu_opts());

   collect_options(PrintAssemblyOptions);

   if (strstr(options(), "hsdis-")) {

     if (strstr(options(), "hsdis-print-raw"))

       _print_raw = (strstr(options(), "xml") ? 2 : 1);

     if (strstr(options(), "hsdis-print-pc"))

       _print_pc = !_print_pc;

     if (strstr(options(), "hsdis-print-bytes"))

       _print_bytes = !_print_bytes;

   }

   if (strstr(options(), "help")) {

     tty->print_cr("PrintAssemblyOptions help:");

     tty->print_cr("  hsdis-print-raw       test plugin by requesting raw output");

     tty->print_cr("  hsdis-print-raw-xml   test plugin by requesting raw xml");

     tty->print_cr("  hsdis-print-pc        turn off PC printing (on by default)");

     tty->print_cr("  hsdis-print-bytes     turn on instruction byte output");

     tty->print_cr("combined options: %s", options());

   }

 }

 address decode_env::handle_event(const char* event, address arg) {

   if (match(event, "insn")) {

     start_insn(arg);

   } else if (match(event, "/insn")) {

     end_insn(arg);

   } else if (match(event, "addr")) {

     if (arg != NULL) {

       print_address(arg);

       return arg;

     }

   } else if (match(event, "mach")) {

    output()->print_cr("[Disassembling for mach='%s']", arg);

   } else if (match(event, "format bytes-per-line")) {

     _bytes_per_line = (int) (intptr_t) arg;

   } else {

     // ignore unrecognized markup

   }

   return NULL;

 }

 // called by the disassembler to print out jump targets and data addresses

 void decode_env::print_address(address adr) {

   outputStream* st = _output;

   if (adr == NULL) {

     st->print("NULL");

     return;

   }

   int small_num = (int)(intptr_t)adr;

   if ((intptr_t)adr == (intptr_t)small_num

       && -1 <= small_num && small_num <= 9) {

     st->print("%d", small_num);

     return;

   }

   if (Universe::is_fully_initialized()) {

     if (StubRoutines::contains(adr)) {

       StubCodeDesc* desc = StubCodeDesc::desc_for(adr);

       if (desc == NULL)

         desc = StubCodeDesc::desc_for(adr + frame::pc_return_offset);

       if (desc != NULL) {

         st->print("Stub::%s", desc->name());

         if (desc->begin() != adr)

           st->print("%+d 0x%p",adr - desc->begin(), adr);

         else if (WizardMode) st->print(" " INTPTR_FORMAT, adr);

         return;

       }

       st->print("Stub::<unknown> " INTPTR_FORMAT, adr);

       return;

     }

     BarrierSet* bs = Universe::heap()->barrier_set();

     if (bs->kind() == BarrierSet::CardTableModRef &&

         adr == (address)((CardTableModRefBS*)(bs))->byte_map_base) {

       st->print("word_map_base");

       if (WizardMode) st->print(" " INTPTR_FORMAT, (intptr_t)adr);

       return;

     }

     oop obj;

     if (_nm != NULL

         && (obj = _nm->embeddedOop_at(cur_insn())) != NULL

         && (address) obj == adr

         && Universe::heap()->is_in(obj)

         && Universe::heap()->is_in(obj->klass())) {

       julong c = st->count();

       obj->print_value_on(st);

       if (st->count() == c) {

         // No output.  (Can happen in product builds.)

         st->print("(a %s)", Klass::cast(obj->klass())->external_name());

       }

       return;

     }

   }

   // Fall through to a simple numeral.

   st->print(INTPTR_FORMAT, (intptr_t)adr);

 }

 void decode_env::print_insn_labels() {

   address p = cur_insn();

   outputStream* st = output();

   CodeBlob* cb = _code;

   if (cb != NULL) {

     cb->print_block_comment(st, p);

   }

   if (_print_pc) {

     st->print("  " INTPTR_FORMAT ": ", (intptr_t) p);

   }

 }

 void decode_env::print_insn_bytes(address pc, address pc_limit) {

   outputStream* st = output();

   size_t incr = 1;

   size_t perline = _bytes_per_line;

   if ((size_t) Disassembler::pd_instruction_alignment() >= sizeof(int)

       && !((uintptr_t)pc % sizeof(int))

       && !((uintptr_t)pc_limit % sizeof(int))) {

     incr = sizeof(int);

     if (perline % incr)  perline += incr - (perline % incr);

   }

   while (pc < pc_limit) {

     // tab to the desired column:

     st->move_to(COMMENT_COLUMN);

     address pc0 = pc;

     address pc1 = pc + perline;

     if (pc1 > pc_limit)  pc1 = pc_limit;

     for (; pc < pc1; pc += incr) {

       if (pc == pc0)

         st->print(BYTES_COMMENT);

       else if ((uint)(pc - pc0) % sizeof(int) == 0)

         st->print(" ");         // put out a space on word boundaries

       if (incr == sizeof(int))

             st->print("%08lx", *(int*)pc);

       else  st->print("%02x",   (*pc)&0xFF);

     }

     st->cr();

   }

 }

 static void* event_to_env(void* env_pv, const char* event, void* arg) {

   decode_env* env = (decode_env*) env_pv;

   return env->handle_event(event, (address) arg);

 }

 static int printf_to_env(void* env_pv, const char* format, ...) {

   decode_env* env = (decode_env*) env_pv;

   outputStream* st = env->output();

   size_t flen = strlen(format);

   const char* raw = NULL;

   if (flen == 0)  return 0;

   if (flen == 1 && format[0] == '\n') { st->bol(); return 1; }

   if (flen < 2 ||

       strchr(format, '%') == NULL) {

     raw = format;

   } else if (format[0] == '%' && format[1] == '%' &&

              strchr(format+2, '%') == NULL) {

     // happens a lot on machines with names like %foo

     flen--;

     raw = format+1;

   }

   if (raw != NULL) {

     st->print_raw(raw, (int) flen);

     return (int) flen;

   }

   va_list ap;

   va_start(ap, format);

   julong cnt0 = st->count();

   st->vprint(format, ap);

   julong cnt1 = st->count();

   va_end(ap);

   return (int)(cnt1 - cnt0);

 }

 address decode_env::decode_instructions(address start, address end) {

   _start = start; _end = end;

   assert(((((intptr_t)start | (intptr_t)end) % Disassembler::pd_instruction_alignment()) == 0), "misaligned insn addr");

   const int show_bytes = false; // for disassembler debugging

   //_version = Disassembler::pd_cpu_version();

   if (!Disassembler::can_decode()) {

     return NULL;

   }

   // decode a series of instructions and return the end of the last instruction

   if (_print_raw) {

     // Print whatever the library wants to print, w/o fancy callbacks.

     // This is mainly for debugging the library itself.

     FILE* out = stdout;

     FILE* xmlout = (_print_raw > 1 ? out : NULL);

     return (address)

       (*Disassembler::_decode_instructions)(start, end,

                                             NULL, (void*) xmlout,

                                             NULL, (void*) out,

                                             options());

   }

   return (address)

     (*Disassembler::_decode_instructions)(start, end,

                                           &event_to_env,  (void*) this,

                                           &printf_to_env, (void*) this,

                                           options());

 }

 void Disassembler::decode(CodeBlob* cb, outputStream* st) {

   if (!load_library())  return;

   decode_env env(cb, st);

   env.output()->print_cr("Decoding CodeBlob " INTPTR_FORMAT, cb);

   env.decode_instructions(cb->instructions_begin(), cb->instructions_end());

 }

 void Disassembler::decode(address start, address end, outputStream* st) {

   if (!load_library())  return;

   decode_env env(CodeCache::find_blob_unsafe(start), st);

   env.decode_instructions(start, end);

 }

 void Disassembler::decode(nmethod* nm, outputStream* st) {

   if (!load_library())  return;

   decode_env env(nm, st);

   env.output()->print_cr("Decoding compiled method " INTPTR_FORMAT ":", nm);

   env.output()->print_cr("Code:");

   unsigned char* p = nm->instructions_begin();

   unsigned char* end = nm->instructions_end();

   // If there has been profiling, print the buckets.

   if (FlatProfiler::bucket_start_for(p) != NULL) {

     unsigned char* p1 = p;

     int total_bucket_count = 0;

     while (p1 < end) {

       unsigned char* p0 = p1;

       p1 += pd_instruction_alignment();

       address bucket_pc = FlatProfiler::bucket_start_for(p1);

       if (bucket_pc != NULL && bucket_pc > p0 && bucket_pc <= p1)

         total_bucket_count += FlatProfiler::bucket_count_for(p0);

     }

     env.set_total_ticks(total_bucket_count);

   }

   env.decode_instructions(p, end);

 }