jdk8-mips64-public/hotspot: src/share/vm/compiler/disassembler.cpp@4b0aa85a9565 (annotated)

src/share/vm/compiler/disassembler.cpp@4b0aa85a9565 (annotated)

src/share/vm/compiler/disassembler.cpp

Tue, 25 Aug 2020 13:30:02 +0200

author: rkennke
date: Tue, 25 Aug 2020 13:30:02 +0200
changeset 10000: 4b0aa85a9565
parent 9920: 3a3803a0c789
child 10003: a0eb08e2db5a
permissions: -rw-r--r--

8222079: Don't use memset to initialize fields decode_env constructor in disassembler.cpp
Reviewed-by: zgu, andrew

 /*
  * Copyright (c) 2008, 2014, 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"
 #include "classfile/javaClasses.hpp"
 #include "code/codeCache.hpp"
 #include "compiler/disassembler.hpp"
 #include "gc_interface/collectedHeap.hpp"
 #include "memory/cardTableModRefBS.hpp"
 #include "runtime/fprofiler.hpp"
 #include "runtime/handles.inline.hpp"
 #include "runtime/stubCodeGenerator.hpp"
 #include "runtime/stubRoutines.hpp"
 #ifdef TARGET_ARCH_x86
 # include "depChecker_x86.hpp"
 #endif
 #ifdef TARGET_ARCH_sparc
 # include "depChecker_sparc.hpp"
 #endif
 #ifdef TARGET_ARCH_zero
 # include "depChecker_zero.hpp"
 #endif
 #ifdef TARGET_ARCH_arm
 # include "depChecker_arm.hpp"
 #endif
 #ifdef TARGET_ARCH_ppc
 # include "depChecker_ppc.hpp"
 #endif
 #ifdef SHARK
 #include "shark/sharkEntry.hpp"
 #endif
 PRAGMA_FORMAT_MUTE_WARNINGS_FOR_GCC
 void*       Disassembler::_library               = NULL;
 bool        Disassembler::_tried_to_load_library = false;
 // This routine is in the shared library:
 Disassembler::decode_func_virtual Disassembler::_decode_instructions_virtual = NULL;
 Disassembler::decode_func Disassembler::_decode_instructions = NULL;
 static const char hsdis_library_name[] = "hsdis-" HOTSPOT_LIB_ARCH;
 static const char decode_instructions_virtual_name[] = "decode_instructions_virtual";
 static const char decode_instructions_name[] = "decode_instructions";
 static bool use_new_version = true;
 #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_virtual != NULL || _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;
   int lib_offset = -1;
   {
     // Match "jvm[^/]*" in jvm_path.
     const char* base = buf;
     const char* p = strrchr(buf, '/');
     if (p != NULL) lib_offset = p - base + 1;
     p = strstr(p ? p : base, "jvm");
     if (p != NULL)  jvm_offset = p - base;
   }
   // Find the disassembler shared library.
   // Search for several paths derived from libjvm, in this order:
   // 1. <home>/jre/lib/<arch>/<vm>/libhsdis-<arch>.so  (for compatibility)
   // 2. <home>/jre/lib/<arch>/<vm>/hsdis-<arch>.so
   // 3. <home>/jre/lib/<arch>/hsdis-<arch>.so
   // 4. hsdis-<arch>.so  (using LD_LIBRARY_PATH)
   if (jvm_offset >= 0) {
     // 1. <home>/jre/lib/<arch>/<vm>/libhsdis-<arch>.so
     strcpy(&buf[jvm_offset], hsdis_library_name);
     strcat(&buf[jvm_offset], os::dll_file_extension());
     _library = os::dll_load(buf, ebuf, sizeof ebuf);
     if (_library == NULL) {
       // 2. <home>/jre/lib/<arch>/<vm>/hsdis-<arch>.so
       strcpy(&buf[lib_offset], hsdis_library_name);
       strcat(&buf[lib_offset], os::dll_file_extension());
       _library = os::dll_load(buf, ebuf, sizeof ebuf);
     }
     if (_library == NULL) {
       // 3. <home>/jre/lib/<arch>/hsdis-<arch>.so
       buf[lib_offset - 1] = '\0';
       const char* p = strrchr(buf, '/');
       if (p != NULL) {
         lib_offset = p - buf + 1;
         strcpy(&buf[lib_offset], hsdis_library_name);
         strcat(&buf[lib_offset], os::dll_file_extension());
         _library = os::dll_load(buf, ebuf, sizeof ebuf);
       }
     }
   }
   if (_library == NULL) {
     // 4. hsdis-<arch>.so  (using LD_LIBRARY_PATH)
     strcpy(&buf[0], hsdis_library_name);
     strcat(&buf[0], os::dll_file_extension());
     _library = os::dll_load(buf, ebuf, sizeof ebuf);
   }
   if (_library != NULL) {
     _decode_instructions_virtual = CAST_TO_FN_PTR(Disassembler::decode_func_virtual,
                                           os::dll_lookup(_library, decode_instructions_virtual_name));
   }
   if (_decode_instructions_virtual == NULL) {
     // could not spot in new version, try old version
     _decode_instructions = CAST_TO_FN_PTR(Disassembler::decode_func,
                                           os::dll_lookup(_library, decode_instructions_name));
     use_new_version = false;
   } else {
     use_new_version = true;
   }
   _tried_to_load_library = true;
   if (_decode_instructions_virtual == NULL && _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;
   CodeStrings   _strings;
   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, CodeStrings c = CodeStrings());
   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);
         }
       }
     }
     // follow each complete insn by a nice newline
     st->cr();
   }
   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, CodeStrings c) :
   _nm((code != NULL && code->is_nmethod()) ? (nmethod*)code : NULL),
   _code(code),
   _strings(),
   _output(output ? output : tty),
   _start(NULL),
   _end(NULL),
   _option_buf(),
   _print_raw(0),
   // by default, output pc but not bytes:
   _print_pc(true),
   _print_bytes(false),
   _cur_insn(NULL),
   _total_ticks(0),
   _bytes_per_line(Disassembler::pd_instruction_alignment())
 {
   memset(_option_buf, 0, sizeof(_option_buf));
   _strings.copy(c);
   // 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")) {
     static char buffer[32] = { 0, };
     if (strcmp(buffer, (const char*)arg) != 0 ||
         strlen((const char*)arg) > sizeof(buffer) - 1) {
       // Only print this when the mach changes
       strncpy(buffer, (const char*)arg, sizeof(buffer) - 1);
       buffer[sizeof(buffer) - 1] = '\0';
       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(" " PTR_FORMAT, adr);
         return;
       }
       st->print("Stub::<unknown> " PTR_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)", obj->klass()->external_name());
       }
       return;
     }
   }
   // Fall through to a simple (hexadecimal) numeral.
   st->print(PTR_FORMAT, 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);
   }
   _strings.print_block_comment(st, (intptr_t)(p - _start));
   if (_print_pc) {
     st->print("  " PTR_FORMAT ": ", 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);
 }
 ATTRIBUTE_PRINTF(2, 3)
 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 use_new_version ?
       (address)
       (*Disassembler::_decode_instructions_virtual)((uintptr_t)start, (uintptr_t)end,
                                                     start, end - start,
                                                     NULL, (void*) xmlout,
                                                     NULL, (void*) out,
                                                     options(), 0/*nice new line*/)
       :
       (address)
       (*Disassembler::_decode_instructions)(start, end,
                                             NULL, (void*) xmlout,
                                             NULL, (void*) out,
                                             options());
   }
   return use_new_version ?
     (address)
     (*Disassembler::_decode_instructions_virtual)((uintptr_t)start, (uintptr_t)end,
                                                   start, end - start,
                                                   &event_to_env,  (void*) this,
                                                   &printf_to_env, (void*) this,
                                                   options(), 0/*nice new line*/)
     :
     (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 " PTR_FORMAT, cb);
   env.decode_instructions(cb->code_begin(), cb->code_end());
 }
 void Disassembler::decode(address start, address end, outputStream* st, CodeStrings c) {
   if (!load_library())  return;
   decode_env env(CodeCache::find_blob_unsafe(start), st, c);
   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 " PTR_FORMAT ":", nm);
   env.output()->print_cr("Code:");
 #ifdef SHARK
   SharkEntry* entry = (SharkEntry *) nm->code_begin();
   unsigned char* p   = entry->code_start();
   unsigned char* end = entry->code_limit();
 #else
   unsigned char* p   = nm->code_begin();
   unsigned char* end = nm->code_end();
 #endif // SHARK
   // 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);
   }
   // Print constant table.
   if (nm->consts_size() > 0) {
     nm->print_nmethod_labels(env.output(), nm->consts_begin());
     int offset = 0;
     for (address p = nm->consts_begin(); p < nm->consts_end(); p += 4, offset += 4) {
       if ((offset % 8) == 0) {
         env.output()->print_cr("  " PTR_FORMAT " (offset: %4d): " PTR32_FORMAT "   " PTR64_FORMAT, p, offset, *((int32_t*) p), *((int64_t*) p));
       } else {
         env.output()->print_cr("  " PTR_FORMAT " (offset: %4d): " PTR32_FORMAT,                    p, offset, *((int32_t*) p));
       }
     }
   }
   env.decode_instructions(p, end);
 }

Mercurial > jdk8-mips64-public > hotspot / annotate

src/share/vm/compiler/disassembler.cpp@4b0aa85a9565 (annotated)

src/share/vm/compiler/disassembler.cpp