364 lines
13 KiB
C++
364 lines
13 KiB
C++
/*
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* Copyright (c) 2019, Oracle and/or its affiliates. All rights reserved.
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* Copyright (c) 2019 SAP SE. 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 Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
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* or visit www.oracle.com if you need additional information or have any
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* questions.
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*
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*/
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// AbstractDisassembler is the base class for
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// platform-specific Disassembler classes.
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#include "precompiled.hpp"
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#include "asm/assembler.inline.hpp"
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#include "compiler/abstractDisassembler.hpp"
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#include "oops/oop.inline.hpp"
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#include "utilities/debug.hpp"
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#include "utilities/ostream.hpp"
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// Default values for what is being printed as line prefix when disassembling a single instruction.
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// Can be overridden by command line parameter PrintAssemblyOptions.
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bool AbstractDisassembler::_show_data_hex = true;
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bool AbstractDisassembler::_show_data_int = false;
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bool AbstractDisassembler::_show_data_float = false;
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bool AbstractDisassembler::_align_instr = true;
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bool AbstractDisassembler::_show_pc = true;
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bool AbstractDisassembler::_show_offset = false;
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bool AbstractDisassembler::_show_structs = true;
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bool AbstractDisassembler::_show_comment = true;
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bool AbstractDisassembler::_show_block_comment = true;
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// set "true" to see what's in memory bit by bit
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// might prove cumbersome on platforms where instr_len is hard to find out
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bool AbstractDisassembler::_show_bytes = false;
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// Return #bytes printed. Callers may use that for output alignment.
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// Print instruction address, and offset from blob begin.
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// Offset width (2, 4, 6, 8 bytes) is adapted to size of blob.
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// Working assumption: we are at st->bol() upon entry. If not, it's the
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// caller's responsibility to guarantee proper alignment.
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int AbstractDisassembler::print_location(address here, address begin, address end, outputStream* st, bool align, bool print_header) {
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const int pos_0 = st->position();
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if (show_pc() || show_offset()) {
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st->print(" ");
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}
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if (show_pc()) {
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if (print_header) {
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st->print(" %*s", 18, "Address");
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} else {
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st->print(" " PTR_FORMAT, p2i(here));
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}
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}
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if (show_offset()) {
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#ifdef ASSERT
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if ((uintptr_t)begin > (uintptr_t)here) st->print(">>begin(" PTR_FORMAT ") > here(" PTR_FORMAT ")<<", p2i(begin), p2i(here));
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if ((uintptr_t)end < (uintptr_t)here) st->print(">> end(" PTR_FORMAT ") < here(" PTR_FORMAT ")<<", p2i(end), p2i(here));
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assert((uintptr_t)begin <= (uintptr_t)end, "inverted address range");
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#endif
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const int blob_len = end - begin;
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const int offset = here - begin;
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const int width = (blob_len < (1<< 8)) ? 2 : (blob_len < (1<<16)) ? 4 : (blob_len < (1<<24)) ? 6 : 8;
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if (print_header) {
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st->print(" %*s", width+5, "offset");
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} else {
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st->print(" (+0x%*.*x)", width, width, offset);
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}
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}
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if ((show_pc() || show_offset()) && !print_header) {
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st->print(": ");
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}
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if (align) {
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const uint tabspacing = 8;
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const uint pos = st->position();
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const uint aligned_pos = ((pos+tabspacing-1)/tabspacing)*tabspacing /* - 1 */;
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st->fill_to(aligned_pos);
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}
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return st->position() - pos_0;
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}
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// Return #bytes printed. Callers may use that for output alignment.
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// Print instruction in hexadecimal representation, using 2-byte blocks.
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// Used with real disassemblies. Not so useful with abstract disassemblies.
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int AbstractDisassembler::print_instruction(address here, int len, int max_len, outputStream* st, bool align, bool print_header) {
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if (show_bytes()) {
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const int block_bytes = 2;
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const int pos_0 = st->position();
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address pos = here;
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//---< print instruction bytes in blocks >---
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// must print byte by byte: address might be unaligned.
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for (; pos <= here + len - block_bytes; pos += block_bytes) {
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for (address byte = pos; byte < pos + block_bytes; byte++) {
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st->print("%2.2x", *byte);
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}
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st->print(" ");
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}
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//---< Print the remaining bytes of the instruction >---
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if ((len & (block_bytes - 1)) != 0) {
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for (; pos < here + len; pos++) {
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st->print("%2.2x", *pos);
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}
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}
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//---< filler for shorter than max_len instructions >---
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for (int i = len+1; i < max_len; i++) {
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st->print(" ");
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}
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st->print(" "); // separator space.
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print_delimiter(st);
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return st->position() - pos_0;
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}
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if (align) {
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const uint tabspacing = 8;
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const uint pos = st->position();
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const uint aligned_pos = ((pos+tabspacing-1)/tabspacing)*tabspacing /* - 1 */;
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st->fill_to(aligned_pos);
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}
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return 0;
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}
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// Return #bytes printed. Callers may use that for output alignment.
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// Print data (e.g. constant pool entries) in hex format.
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// Depending on the alignment, short, int, and long entities are printed.
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// If selected, data is formatted as int/long and float/double values in addition.
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int AbstractDisassembler::print_hexdata(address here, int len, outputStream* st, bool print_header) {
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const int tsize = 8;
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const int pos_0 = st->position();
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int pos = pos_0;
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int align = ((pos+tsize-1)/tsize)*tsize;
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st->fill_to(align);
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//---< printing hex data >---
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if (show_data_hex()) {
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switch (len) {
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case 1: if (print_header) {
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st->print("hex1");
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} else {
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st->print("0x%02x", *here);
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}
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st->fill_to(align += tsize);
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case 2: if (print_header) {
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st->print(" hex2");
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} else {
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if (((uintptr_t)(here)&0x01) == 0) {
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st->print("0x%04x", *((jushort*)here));
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}
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}
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st->fill_to(align += tsize);
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case 4: if (print_header) {
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st->print(" hex4");
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} else {
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if (((uintptr_t)(here)&0x03) == 0) {
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st->print("0x%08x", *((juint*)here));
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}
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}
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st->fill_to(align += 2*tsize);
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case 8: if (print_header) {
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st->print(" hex8");
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} else {
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if (((uintptr_t)(here)&0x07) == 0) {
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st->print(PTR_FORMAT, *((uintptr_t*)here));
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}
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}
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st->fill_to(align += 3*tsize);
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break;
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default: ;
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}
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pos = st->position();
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align = ((pos+tsize-1)/tsize)*tsize;
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st->fill_to(align);
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}
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//---< printing int/long data >---
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if (show_data_int()) {
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switch (len) {
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case 4: if (print_header) {
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st->print(" int");
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} else {
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if (((uintptr_t)(here)&0x03) == 0) {
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st->print("%12.1d", *((jint*)here));
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}
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}
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st->fill_to(align += 2*tsize);
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case 8: if (print_header) {
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st->print(" long");
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} else {
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if (((uintptr_t)(here)&0x07) == 0) {
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st->print(JLONG_FORMAT_W(23), *((jlong*)here));
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}
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}
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st->fill_to(align += 3*tsize);
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break;
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default: ;
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}
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pos = st->position();
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align = ((pos+tsize-1)/tsize)*tsize;
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st->fill_to(align);
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}
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//---< printing float/double data >---
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if (show_data_float()) {
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switch (len) {
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case 4: if (print_header) {
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st->print(" float");
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} else {
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if (((uintptr_t)(here)&0x03) == 0) {
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st->print("%15.7e", (double)*((float*)here));
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}
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}
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st->fill_to(align += 2*tsize);
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case 8: if (print_header) {
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st->print(" double");
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} else {
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if (((uintptr_t)(here)&0x07) == 0) {
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st->print("%23.15e", *((double*)here));
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}
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}
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st->fill_to(align += 3*tsize);
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break;
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default: ;
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}
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}
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return st->position() - pos_0;
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}
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// Return #bytes printed. Callers may use that for output alignment.
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// Print an instruction delimiter.
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int AbstractDisassembler::print_delimiter(outputStream* st) {
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if (align_instr()) { st->print("| "); return 2; }
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else return 0;
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}
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// Decodes the one instruction at address start in a platform-independent format.
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// Returns the start of the next instruction (which is 'start' plus 'instruction_size_in_bytes').
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// The parameter max_instr_size_in_bytes is used for output alignment purposes only.
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address AbstractDisassembler::decode_instruction_abstract(address start,
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outputStream* st,
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const int instruction_size_in_bytes,
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const int max_instr_size_in_bytes) {
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assert(instruction_size_in_bytes > 0, "no zero-size instructions!");
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assert(max_instr_size_in_bytes >= instruction_size_in_bytes, "inconsistent call parameters");
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//---< current instruction is at the start address >---
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unsigned char* current = (unsigned char*) start;
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int filler_limit = align_instr() ? max_instr_size_in_bytes : ((instruction_size_in_bytes+abstract_instruction_bytes_per_block-1)/abstract_instruction_bytes_per_block)
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*abstract_instruction_bytes_per_block;
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//---< print the instruction's bytes >---
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for (int i = 1; i <= instruction_size_in_bytes; i++) {
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st->print("%02x", *current);
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++current;
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if (abstract_instruction_bytes_per_block <= max_instr_size_in_bytes) {
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if (i%abstract_instruction_bytes_per_block == 0) st->print(" ");
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} else {
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if (i == instruction_size_in_bytes) st->print(" ");
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}
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}
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//---< print some filler spaces to column-align instructions >---
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for (int i = instruction_size_in_bytes+1; i <= filler_limit; i++) {
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st->print(" ");
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if (abstract_instruction_bytes_per_block <= max_instr_size_in_bytes) {
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if (i%abstract_instruction_bytes_per_block == 0) st->print(" ");
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} else {
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if (i == instruction_size_in_bytes) st->print(" ");
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}
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}
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//---< the address of the next instruction >---
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return (address) current;
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}
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// Decodes all instructions in the given range [start..end)
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// calling decode_instruction_abstract for each instruction.
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// The format is platform dependent only to the extend that
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// it respects the actual instruction length where possible.
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// Does not print any markers or decorators.
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void AbstractDisassembler::decode_range_abstract(address range_start, address range_end,
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address start, address end,
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outputStream* st,
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const int max_instr_size_in_bytes) {
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assert(st != NULL, "need an output stream (no default)!");
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int idx = 0;
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address pos = range_start;
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while ((pos != NULL) && (pos < range_end)) {
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int instr_size_in_bytes = Assembler::instr_len(pos);
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if (idx == 0) print_location(pos, start, end, st, false, false);
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else print_delimiter(st);
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//---< print the instruction's bytes >---
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// don't access storage beyond end of range
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if (pos + instr_size_in_bytes <= range_end) {
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pos = decode_instruction_abstract(pos, st, instr_size_in_bytes, max_instr_size_in_bytes);
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} else {
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// If the range to be decoded contains garbage at the end (e.g. 0xcc initializer bytes),
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// instruction size calculation may run out of sync. Just terminate in that case.
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pos = range_end;
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}
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idx += instr_size_in_bytes;
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if (start_newline(idx)) {
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st->cr();
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idx = 0;
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}
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}
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}
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// Decodes all instructions in the given range [start..end).
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// The output is enclosed in [MachCode] and [/MachCode] tags for later recognition.
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// The format is platform dependent only to the extend that
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// it respects the actual instruction length where possible.
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void AbstractDisassembler::decode_abstract(address start, address end, outputStream* ost,
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const int max_instr_size_in_bytes) {
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int idx = 0;
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address pos = start;
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outputStream* st = (ost == NULL) ? tty : ost;
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//---< Open the output (Marker for post-mortem disassembler) >---
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st->bol();
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st->print_cr("[MachCode]");
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decode_range_abstract(start, end, start, end, st, max_instr_size_in_bytes);
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//---< Close the output (Marker for post-mortem disassembler) >---
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st->bol();
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st->print_cr("[/MachCode]");
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}
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