| File: | jdk/src/hotspot/share/compiler/abstractDisassembler.cpp |
| Warning: | line 246, column 27 Although the value stored to 'align' is used in the enclosing expression, the value is never actually read from 'align' |
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| 1 | /* |
| 2 | * Copyright (c) 2019, Oracle and/or its affiliates. All rights reserved. |
| 3 | * Copyright (c) 2019 SAP SE. All rights reserved. |
| 4 | * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. |
| 5 | * |
| 6 | * This code is free software; you can redistribute it and/or modify it |
| 7 | * under the terms of the GNU General Public License version 2 only, as |
| 8 | * published by the Free Software Foundation. |
| 9 | * |
| 10 | * This code is distributed in the hope that it will be useful, but WITHOUT |
| 11 | * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or |
| 12 | * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License |
| 13 | * version 2 for more details (a copy is included in the LICENSE file that |
| 14 | * accompanied this code). |
| 15 | * |
| 16 | * You should have received a copy of the GNU General Public License version |
| 17 | * 2 along with this work; if not, write to the Free Software Foundation, |
| 18 | * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. |
| 19 | * |
| 20 | * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA |
| 21 | * or visit www.oracle.com if you need additional information or have any |
| 22 | * questions. |
| 23 | * |
| 24 | */ |
| 25 | |
| 26 | // AbstractDisassembler is the base class for |
| 27 | // platform-specific Disassembler classes. |
| 28 | |
| 29 | #include "precompiled.hpp" |
| 30 | #include "asm/assembler.inline.hpp" |
| 31 | #include "compiler/abstractDisassembler.hpp" |
| 32 | #include "oops/oop.inline.hpp" |
| 33 | #include "utilities/debug.hpp" |
| 34 | #include "utilities/ostream.hpp" |
| 35 | |
| 36 | // Default values for what is being printed as line prefix when disassembling a single instruction. |
| 37 | // Can be overridden by command line parameter PrintAssemblyOptions. |
| 38 | bool AbstractDisassembler::_show_data_hex = true; |
| 39 | bool AbstractDisassembler::_show_data_int = false; |
| 40 | bool AbstractDisassembler::_show_data_float = false; |
| 41 | bool AbstractDisassembler::_align_instr = true; |
| 42 | bool AbstractDisassembler::_show_pc = true; |
| 43 | bool AbstractDisassembler::_show_offset = false; |
| 44 | bool AbstractDisassembler::_show_structs = true; |
| 45 | bool AbstractDisassembler::_show_comment = true; |
| 46 | bool AbstractDisassembler::_show_block_comment = true; |
| 47 | |
| 48 | // set "true" to see what's in memory bit by bit |
| 49 | // might prove cumbersome on platforms where instr_len is hard to find out |
| 50 | bool AbstractDisassembler::_show_bytes = false; |
| 51 | |
| 52 | // Return #bytes printed. Callers may use that for output alignment. |
| 53 | // Print instruction address, and offset from blob begin. |
| 54 | // Offset width (2, 4, 6, 8 bytes) is adapted to size of blob. |
| 55 | // Working assumption: we are at st->bol() upon entry. If not, it's the |
| 56 | // caller's responsibility to guarantee proper alignment. |
| 57 | int AbstractDisassembler::print_location(address here, address begin, address end, outputStream* st, bool align, bool print_header) { |
| 58 | const int pos_0 = st->position(); |
| 59 | |
| 60 | if (show_pc() || show_offset()) { |
| 61 | st->print(" "); |
| 62 | } |
| 63 | |
| 64 | if (show_pc()) { |
| 65 | if (print_header) { |
| 66 | st->print(" %*s", 18, "Address"); |
| 67 | } else { |
| 68 | st->print(" " PTR_FORMAT"0x%016" "l" "x", p2i(here)); |
| 69 | } |
| 70 | } |
| 71 | |
| 72 | if (show_offset()) { |
| 73 | #ifdef ASSERT1 |
| 74 | if ((uintptr_t)begin > (uintptr_t)here) st->print(">>begin(" PTR_FORMAT"0x%016" "l" "x" ") > here(" PTR_FORMAT"0x%016" "l" "x" ")<<", p2i(begin), p2i(here)); |
| 75 | if ((uintptr_t)end < (uintptr_t)here) st->print(">> end(" PTR_FORMAT"0x%016" "l" "x" ") < here(" PTR_FORMAT"0x%016" "l" "x" ")<<", p2i(end), p2i(here)); |
| 76 | assert((uintptr_t)begin <= (uintptr_t)end, "inverted address range")do { if (!((uintptr_t)begin <= (uintptr_t)end)) { (*g_assert_poison ) = 'X';; report_vm_error("/home/daniel/Projects/java/jdk/src/hotspot/share/compiler/abstractDisassembler.cpp" , 76, "assert(" "(uintptr_t)begin <= (uintptr_t)end" ") failed" , "inverted address range"); ::breakpoint(); } } while (0); |
| 77 | #endif |
| 78 | const int blob_len = end - begin; |
| 79 | const int offset = here - begin; |
| 80 | const int width = (blob_len < (1<< 8)) ? 2 : (blob_len < (1<<16)) ? 4 : (blob_len < (1<<24)) ? 6 : 8; |
| 81 | if (print_header) { |
| 82 | st->print(" %*s", width+5, "offset"); |
| 83 | } else { |
| 84 | st->print(" (+0x%*.*x)", width, width, offset); |
| 85 | } |
| 86 | } |
| 87 | |
| 88 | if ((show_pc() || show_offset()) && !print_header) { |
| 89 | st->print(": "); |
| 90 | } |
| 91 | |
| 92 | if (align) { |
| 93 | const uint tabspacing = 8; |
| 94 | const uint pos = st->position(); |
| 95 | const uint aligned_pos = ((pos+tabspacing-1)/tabspacing)*tabspacing /* - 1 */; |
| 96 | st->fill_to(aligned_pos); |
| 97 | } |
| 98 | |
| 99 | return st->position() - pos_0; |
| 100 | } |
| 101 | |
| 102 | |
| 103 | // Return #bytes printed. Callers may use that for output alignment. |
| 104 | // Print instruction in hexadecimal representation, using 2-byte blocks. |
| 105 | // Used with real disassemblies. Not so useful with abstract disassemblies. |
| 106 | int AbstractDisassembler::print_instruction(address here, int len, int max_len, outputStream* st, bool align, bool print_header) { |
| 107 | if (show_bytes()) { |
| 108 | const int block_bytes = 2; |
| 109 | const int pos_0 = st->position(); |
| 110 | address pos = here; |
| 111 | |
| 112 | //---< print instruction bytes in blocks >--- |
| 113 | // must print byte by byte: address might be unaligned. |
| 114 | for (; pos <= here + len - block_bytes; pos += block_bytes) { |
| 115 | for (address byte = pos; byte < pos + block_bytes; byte++) { |
| 116 | st->print("%2.2x", *byte); |
| 117 | } |
| 118 | st->print(" "); |
| 119 | } |
| 120 | |
| 121 | //---< Print the remaining bytes of the instruction >--- |
| 122 | if ((len & (block_bytes - 1)) != 0) { |
| 123 | for (; pos < here + len; pos++) { |
| 124 | st->print("%2.2x", *pos); |
| 125 | } |
| 126 | } |
| 127 | |
| 128 | //---< filler for shorter than max_len instructions >--- |
| 129 | for (int i = len+1; i < max_len; i++) { |
| 130 | st->print(" "); |
| 131 | } |
| 132 | |
| 133 | st->print(" "); // separator space. |
| 134 | print_delimiter(st); |
| 135 | return st->position() - pos_0; |
| 136 | } |
| 137 | |
| 138 | if (align) { |
| 139 | const uint tabspacing = 8; |
| 140 | const uint pos = st->position(); |
| 141 | const uint aligned_pos = ((pos+tabspacing-1)/tabspacing)*tabspacing /* - 1 */; |
| 142 | st->fill_to(aligned_pos); |
| 143 | } |
| 144 | |
| 145 | return 0; |
| 146 | } |
| 147 | |
| 148 | |
| 149 | // Return #bytes printed. Callers may use that for output alignment. |
| 150 | // Print data (e.g. constant pool entries) in hex format. |
| 151 | // Depending on the alignment, short, int, and long entities are printed. |
| 152 | // If selected, data is formatted as int/long and float/double values in addition. |
| 153 | int AbstractDisassembler::print_hexdata(address here, int len, outputStream* st, bool print_header) { |
| 154 | const int tsize = 8; |
| 155 | const int pos_0 = st->position(); |
| 156 | int pos = pos_0; |
| 157 | int align = ((pos+tsize-1)/tsize)*tsize; |
| 158 | st->fill_to(align); |
| 159 | |
| 160 | //---< printing hex data >--- |
| 161 | if (show_data_hex()) { |
| 162 | switch (len) { |
| 163 | case 1: if (print_header) { |
| 164 | st->print("hex1"); |
| 165 | } else { |
| 166 | st->print("0x%02x", *here); |
| 167 | } |
| 168 | st->fill_to(align += tsize); |
| 169 | case 2: if (print_header) { |
| 170 | st->print(" hex2"); |
| 171 | } else { |
| 172 | if (((uintptr_t)(here)&0x01) == 0) { |
| 173 | st->print("0x%04x", *((jushort*)here)); |
| 174 | } |
| 175 | } |
| 176 | st->fill_to(align += tsize); |
| 177 | case 4: if (print_header) { |
| 178 | st->print(" hex4"); |
| 179 | } else { |
| 180 | if (((uintptr_t)(here)&0x03) == 0) { |
| 181 | st->print("0x%08x", *((juint*)here)); |
| 182 | } |
| 183 | } |
| 184 | st->fill_to(align += 2*tsize); |
| 185 | case 8: if (print_header) { |
| 186 | st->print(" hex8"); |
| 187 | } else { |
| 188 | if (((uintptr_t)(here)&0x07) == 0) { |
| 189 | st->print(PTR_FORMAT"0x%016" "l" "x", *((uintptr_t*)here)); |
| 190 | } |
| 191 | } |
| 192 | st->fill_to(align += 3*tsize); |
| 193 | break; |
| 194 | default: ; |
| 195 | } |
| 196 | pos = st->position(); |
| 197 | align = ((pos+tsize-1)/tsize)*tsize; |
| 198 | st->fill_to(align); |
| 199 | } |
| 200 | |
| 201 | //---< printing int/long data >--- |
| 202 | if (show_data_int()) { |
| 203 | switch (len) { |
| 204 | case 4: if (print_header) { |
| 205 | st->print(" int"); |
| 206 | } else { |
| 207 | if (((uintptr_t)(here)&0x03) == 0) { |
| 208 | st->print("%12.1d", *((jint*)here)); |
| 209 | } |
| 210 | } |
| 211 | st->fill_to(align += 2*tsize); |
| 212 | case 8: if (print_header) { |
| 213 | st->print(" long"); |
| 214 | } else { |
| 215 | if (((uintptr_t)(here)&0x07) == 0) { |
| 216 | st->print(JLONG_FORMAT_W(23)"%" "23" "l" "d", *((jlong*)here)); |
| 217 | } |
| 218 | } |
| 219 | st->fill_to(align += 3*tsize); |
| 220 | break; |
| 221 | default: ; |
| 222 | } |
| 223 | pos = st->position(); |
| 224 | align = ((pos+tsize-1)/tsize)*tsize; |
| 225 | st->fill_to(align); |
| 226 | } |
| 227 | |
| 228 | //---< printing float/double data >--- |
| 229 | if (show_data_float()) { |
| 230 | switch (len) { |
| 231 | case 4: if (print_header) { |
| 232 | st->print(" float"); |
| 233 | } else { |
| 234 | if (((uintptr_t)(here)&0x03) == 0) { |
| 235 | st->print("%15.7e", (double)*((float*)here)); |
| 236 | } |
| 237 | } |
| 238 | st->fill_to(align += 2*tsize); |
| 239 | case 8: if (print_header) { |
| 240 | st->print(" double"); |
| 241 | } else { |
| 242 | if (((uintptr_t)(here)&0x07) == 0) { |
| 243 | st->print("%23.15e", *((double*)here)); |
| 244 | } |
| 245 | } |
| 246 | st->fill_to(align += 3*tsize); |
Although the value stored to 'align' is used in the enclosing expression, the value is never actually read from 'align' | |
| 247 | break; |
| 248 | default: ; |
| 249 | } |
| 250 | } |
| 251 | |
| 252 | return st->position() - pos_0; |
| 253 | } |
| 254 | |
| 255 | |
| 256 | // Return #bytes printed. Callers may use that for output alignment. |
| 257 | // Print an instruction delimiter. |
| 258 | int AbstractDisassembler::print_delimiter(outputStream* st) { |
| 259 | if (align_instr()) { st->print("| "); return 2; } |
| 260 | else return 0; |
| 261 | } |
| 262 | |
| 263 | |
| 264 | // Decodes the one instruction at address start in a platform-independent format. |
| 265 | // Returns the start of the next instruction (which is 'start' plus 'instruction_size_in_bytes'). |
| 266 | // The parameter max_instr_size_in_bytes is used for output alignment purposes only. |
| 267 | address AbstractDisassembler::decode_instruction_abstract(address start, |
| 268 | outputStream* st, |
| 269 | const int instruction_size_in_bytes, |
| 270 | const int max_instr_size_in_bytes) { |
| 271 | assert(instruction_size_in_bytes > 0, "no zero-size instructions!")do { if (!(instruction_size_in_bytes > 0)) { (*g_assert_poison ) = 'X';; report_vm_error("/home/daniel/Projects/java/jdk/src/hotspot/share/compiler/abstractDisassembler.cpp" , 271, "assert(" "instruction_size_in_bytes > 0" ") failed" , "no zero-size instructions!"); ::breakpoint(); } } while (0 ); |
| 272 | assert(max_instr_size_in_bytes >= instruction_size_in_bytes, "inconsistent call parameters")do { if (!(max_instr_size_in_bytes >= instruction_size_in_bytes )) { (*g_assert_poison) = 'X';; report_vm_error("/home/daniel/Projects/java/jdk/src/hotspot/share/compiler/abstractDisassembler.cpp" , 272, "assert(" "max_instr_size_in_bytes >= instruction_size_in_bytes" ") failed", "inconsistent call parameters"); ::breakpoint(); } } while (0); |
| 273 | |
| 274 | //---< current instruction is at the start address >--- |
| 275 | unsigned char* current = (unsigned char*) start; |
| 276 | 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) |
| 277 | *abstract_instruction_bytes_per_block; |
| 278 | |
| 279 | //---< print the instruction's bytes >--- |
| 280 | for (int i = 1; i <= instruction_size_in_bytes; i++) { |
| 281 | st->print("%02x", *current); |
| 282 | ++current; |
| 283 | if (abstract_instruction_bytes_per_block <= max_instr_size_in_bytes) { |
| 284 | if (i%abstract_instruction_bytes_per_block == 0) st->print(" "); |
| 285 | } else { |
| 286 | if (i == instruction_size_in_bytes) st->print(" "); |
| 287 | } |
| 288 | } |
| 289 | |
| 290 | //---< print some filler spaces to column-align instructions >--- |
| 291 | for (int i = instruction_size_in_bytes+1; i <= filler_limit; i++) { |
| 292 | st->print(" "); |
| 293 | if (abstract_instruction_bytes_per_block <= max_instr_size_in_bytes) { |
| 294 | if (i%abstract_instruction_bytes_per_block == 0) st->print(" "); |
| 295 | } else { |
| 296 | if (i == instruction_size_in_bytes) st->print(" "); |
| 297 | } |
| 298 | } |
| 299 | |
| 300 | //---< the address of the next instruction >--- |
| 301 | return (address) current; |
| 302 | } |
| 303 | |
| 304 | |
| 305 | // Decodes all instructions in the given range [start..end) |
| 306 | // calling decode_instruction_abstract for each instruction. |
| 307 | // The format is platform dependent only to the extend that |
| 308 | // it respects the actual instruction length where possible. |
| 309 | // Does not print any markers or decorators. |
| 310 | void AbstractDisassembler::decode_range_abstract(address range_start, address range_end, |
| 311 | address start, address end, |
| 312 | outputStream* st, |
| 313 | const int max_instr_size_in_bytes) { |
| 314 | assert(st != NULL, "need an output stream (no default)!")do { if (!(st != __null)) { (*g_assert_poison) = 'X';; report_vm_error ("/home/daniel/Projects/java/jdk/src/hotspot/share/compiler/abstractDisassembler.cpp" , 314, "assert(" "st != __null" ") failed", "need an output stream (no default)!" ); ::breakpoint(); } } while (0); |
| 315 | int idx = 0; |
| 316 | address pos = range_start; |
| 317 | |
| 318 | while ((pos != NULL__null) && (pos < range_end)) { |
| 319 | int instr_size_in_bytes = Assembler::instr_len(pos); |
| 320 | |
| 321 | if (idx == 0) print_location(pos, start, end, st, false, false); |
| 322 | else print_delimiter(st); |
| 323 | |
| 324 | //---< print the instruction's bytes >--- |
| 325 | // don't access storage beyond end of range |
| 326 | if (pos + instr_size_in_bytes <= range_end) { |
| 327 | pos = decode_instruction_abstract(pos, st, instr_size_in_bytes, max_instr_size_in_bytes); |
| 328 | } else { |
| 329 | // If the range to be decoded contains garbage at the end (e.g. 0xcc initializer bytes), |
| 330 | // instruction size calculation may run out of sync. Just terminate in that case. |
| 331 | pos = range_end; |
| 332 | } |
| 333 | |
| 334 | idx += instr_size_in_bytes; |
| 335 | if (start_newline(idx)) { |
| 336 | st->cr(); |
| 337 | idx = 0; |
| 338 | } |
| 339 | } |
| 340 | } |
| 341 | |
| 342 | |
| 343 | // Decodes all instructions in the given range [start..end). |
| 344 | // The output is enclosed in [MachCode] and [/MachCode] tags for later recognition. |
| 345 | // The format is platform dependent only to the extend that |
| 346 | // it respects the actual instruction length where possible. |
| 347 | void AbstractDisassembler::decode_abstract(address start, address end, outputStream* ost, |
| 348 | const int max_instr_size_in_bytes) { |
| 349 | int idx = 0; |
| 350 | address pos = start; |
| 351 | |
| 352 | outputStream* st = (ost == NULL__null) ? tty : ost; |
| 353 | |
| 354 | //---< Open the output (Marker for post-mortem disassembler) >--- |
| 355 | st->bol(); |
| 356 | st->print_cr("[MachCode]"); |
| 357 | |
| 358 | decode_range_abstract(start, end, start, end, st, max_instr_size_in_bytes); |
| 359 | |
| 360 | //---< Close the output (Marker for post-mortem disassembler) >--- |
| 361 | st->bol(); |
| 362 | st->print_cr("[/MachCode]"); |
| 363 | } |