diff -r 000000000000 -r f90c822e73f8 src/share/vm/compiler/disassembler.cpp --- /dev/null Thu Jan 01 00:00:00 1970 +0000 +++ b/src/share/vm/compiler/disassembler.cpp Wed Apr 27 01:25:04 2016 +0800 @@ -0,0 +1,553 @@ +/* + * 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. /jre/lib///libhsdis-.so (for compatibility) + // 2. /jre/lib///hsdis-.so + // 3. /jre/lib//hsdis-.so + // 4. hsdis-.so (using LD_LIBRARY_PATH) + if (jvm_offset >= 0) { + // 1. /jre/lib///libhsdis-.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. /jre/lib///hsdis-.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. /jre/lib//hsdis-.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-.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) { + memset(this, 0, sizeof(*this)); + _output = output ? output : tty; + _code = code; + if (code != NULL && code->is_nmethod()) + _nm = (nmethod*) code; + _strings.assign(c); + + // 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")) { + 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); + 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:: " 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); +}