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1 // Copyright 2012 the V8 project authors. All rights reserved. | 1 // Copyright 2012 the V8 project authors. All rights reserved. |
2 // Use of this source code is governed by a BSD-style license that can be | 2 // Use of this source code is governed by a BSD-style license that can be |
3 // found in the LICENSE file. | 3 // found in the LICENSE file. |
4 | 4 |
5 // A Disassembler object is used to disassemble a block of code instruction by | 5 // A Disassembler object is used to disassemble a block of code instruction by |
6 // instruction. The default implementation of the NameConverter object can be | 6 // instruction. The default implementation of the NameConverter object can be |
7 // overriden to modify register names or to do symbol lookup on addresses. | 7 // overriden to modify register names or to do symbol lookup on addresses. |
8 // | 8 // |
9 // The example below will disassemble a block of code and print it to stdout. | 9 // The example below will disassemble a block of code and print it to stdout. |
10 // | 10 // |
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282 | 282 |
283 | 283 |
284 // Printing of instruction name. | 284 // Printing of instruction name. |
285 void Decoder::PrintInstructionName(Instruction* instr) { | 285 void Decoder::PrintInstructionName(Instruction* instr) { |
286 } | 286 } |
287 | 287 |
288 | 288 |
289 // Handle all register based formatting in this function to reduce the | 289 // Handle all register based formatting in this function to reduce the |
290 // complexity of FormatOption. | 290 // complexity of FormatOption. |
291 int Decoder::FormatRegister(Instruction* instr, const char* format) { | 291 int Decoder::FormatRegister(Instruction* instr, const char* format) { |
292 ASSERT(format[0] == 'r'); | 292 DCHECK(format[0] == 'r'); |
293 if (format[1] == 's') { // 'rs: Rs register. | 293 if (format[1] == 's') { // 'rs: Rs register. |
294 int reg = instr->RsValue(); | 294 int reg = instr->RsValue(); |
295 PrintRegister(reg); | 295 PrintRegister(reg); |
296 return 2; | 296 return 2; |
297 } else if (format[1] == 't') { // 'rt: rt register. | 297 } else if (format[1] == 't') { // 'rt: rt register. |
298 int reg = instr->RtValue(); | 298 int reg = instr->RtValue(); |
299 PrintRegister(reg); | 299 PrintRegister(reg); |
300 return 2; | 300 return 2; |
301 } else if (format[1] == 'd') { // 'rd: rd register. | 301 } else if (format[1] == 'd') { // 'rd: rd register. |
302 int reg = instr->RdValue(); | 302 int reg = instr->RdValue(); |
303 PrintRegister(reg); | 303 PrintRegister(reg); |
304 return 2; | 304 return 2; |
305 } | 305 } |
306 UNREACHABLE(); | 306 UNREACHABLE(); |
307 return -1; | 307 return -1; |
308 } | 308 } |
309 | 309 |
310 | 310 |
311 // Handle all FPUregister based formatting in this function to reduce the | 311 // Handle all FPUregister based formatting in this function to reduce the |
312 // complexity of FormatOption. | 312 // complexity of FormatOption. |
313 int Decoder::FormatFPURegister(Instruction* instr, const char* format) { | 313 int Decoder::FormatFPURegister(Instruction* instr, const char* format) { |
314 ASSERT(format[0] == 'f'); | 314 DCHECK(format[0] == 'f'); |
315 if (format[1] == 's') { // 'fs: fs register. | 315 if (format[1] == 's') { // 'fs: fs register. |
316 int reg = instr->FsValue(); | 316 int reg = instr->FsValue(); |
317 PrintFPURegister(reg); | 317 PrintFPURegister(reg); |
318 return 2; | 318 return 2; |
319 } else if (format[1] == 't') { // 'ft: ft register. | 319 } else if (format[1] == 't') { // 'ft: ft register. |
320 int reg = instr->FtValue(); | 320 int reg = instr->FtValue(); |
321 PrintFPURegister(reg); | 321 PrintFPURegister(reg); |
322 return 2; | 322 return 2; |
323 } else if (format[1] == 'd') { // 'fd: fd register. | 323 } else if (format[1] == 'd') { // 'fd: fd register. |
324 int reg = instr->FdValue(); | 324 int reg = instr->FdValue(); |
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335 | 335 |
336 | 336 |
337 // FormatOption takes a formatting string and interprets it based on | 337 // FormatOption takes a formatting string and interprets it based on |
338 // the current instructions. The format string points to the first | 338 // the current instructions. The format string points to the first |
339 // character of the option string (the option escape has already been | 339 // character of the option string (the option escape has already been |
340 // consumed by the caller.) FormatOption returns the number of | 340 // consumed by the caller.) FormatOption returns the number of |
341 // characters that were consumed from the formatting string. | 341 // characters that were consumed from the formatting string. |
342 int Decoder::FormatOption(Instruction* instr, const char* format) { | 342 int Decoder::FormatOption(Instruction* instr, const char* format) { |
343 switch (format[0]) { | 343 switch (format[0]) { |
344 case 'c': { // 'code for break or trap instructions. | 344 case 'c': { // 'code for break or trap instructions. |
345 ASSERT(STRING_STARTS_WITH(format, "code")); | 345 DCHECK(STRING_STARTS_WITH(format, "code")); |
346 PrintCode(instr); | 346 PrintCode(instr); |
347 return 4; | 347 return 4; |
348 } | 348 } |
349 case 'i': { // 'imm16u or 'imm26. | 349 case 'i': { // 'imm16u or 'imm26. |
350 if (format[3] == '1') { | 350 if (format[3] == '1') { |
351 ASSERT(STRING_STARTS_WITH(format, "imm16")); | 351 DCHECK(STRING_STARTS_WITH(format, "imm16")); |
352 if (format[5] == 's') { | 352 if (format[5] == 's') { |
353 ASSERT(STRING_STARTS_WITH(format, "imm16s")); | 353 DCHECK(STRING_STARTS_WITH(format, "imm16s")); |
354 PrintSImm16(instr); | 354 PrintSImm16(instr); |
355 } else if (format[5] == 'u') { | 355 } else if (format[5] == 'u') { |
356 ASSERT(STRING_STARTS_WITH(format, "imm16u")); | 356 DCHECK(STRING_STARTS_WITH(format, "imm16u")); |
357 PrintSImm16(instr); | 357 PrintSImm16(instr); |
358 } else { | 358 } else { |
359 ASSERT(STRING_STARTS_WITH(format, "imm16x")); | 359 DCHECK(STRING_STARTS_WITH(format, "imm16x")); |
360 PrintXImm16(instr); | 360 PrintXImm16(instr); |
361 } | 361 } |
362 return 6; | 362 return 6; |
363 } else { | 363 } else { |
364 ASSERT(STRING_STARTS_WITH(format, "imm26x")); | 364 DCHECK(STRING_STARTS_WITH(format, "imm26x")); |
365 PrintXImm26(instr); | 365 PrintXImm26(instr); |
366 return 6; | 366 return 6; |
367 } | 367 } |
368 } | 368 } |
369 case 'r': { // 'r: registers. | 369 case 'r': { // 'r: registers. |
370 return FormatRegister(instr, format); | 370 return FormatRegister(instr, format); |
371 } | 371 } |
372 case 'f': { // 'f: FPUregisters. | 372 case 'f': { // 'f: FPUregisters. |
373 return FormatFPURegister(instr, format); | 373 return FormatFPURegister(instr, format); |
374 } | 374 } |
375 case 's': { // 'sa. | 375 case 's': { // 'sa. |
376 switch (format[1]) { | 376 switch (format[1]) { |
377 case 'a': { | 377 case 'a': { |
378 ASSERT(STRING_STARTS_WITH(format, "sa")); | 378 DCHECK(STRING_STARTS_WITH(format, "sa")); |
379 PrintSa(instr); | 379 PrintSa(instr); |
380 return 2; | 380 return 2; |
381 } | 381 } |
382 case 'd': { | 382 case 'd': { |
383 ASSERT(STRING_STARTS_WITH(format, "sd")); | 383 DCHECK(STRING_STARTS_WITH(format, "sd")); |
384 PrintSd(instr); | 384 PrintSd(instr); |
385 return 2; | 385 return 2; |
386 } | 386 } |
387 case 's': { | 387 case 's': { |
388 if (format[2] == '1') { | 388 if (format[2] == '1') { |
389 ASSERT(STRING_STARTS_WITH(format, "ss1")); /* ext size */ | 389 DCHECK(STRING_STARTS_WITH(format, "ss1")); /* ext size */ |
390 PrintSs1(instr); | 390 PrintSs1(instr); |
391 return 3; | 391 return 3; |
392 } else { | 392 } else { |
393 ASSERT(STRING_STARTS_WITH(format, "ss2")); /* ins size */ | 393 DCHECK(STRING_STARTS_WITH(format, "ss2")); /* ins size */ |
394 PrintSs2(instr); | 394 PrintSs2(instr); |
395 return 3; | 395 return 3; |
396 } | 396 } |
397 } | 397 } |
398 } | 398 } |
399 } | 399 } |
400 case 'b': { // 'bc - Special for bc1 cc field. | 400 case 'b': { // 'bc - Special for bc1 cc field. |
401 ASSERT(STRING_STARTS_WITH(format, "bc")); | 401 DCHECK(STRING_STARTS_WITH(format, "bc")); |
402 PrintBc(instr); | 402 PrintBc(instr); |
403 return 2; | 403 return 2; |
404 } | 404 } |
405 case 'C': { // 'Cc - Special for c.xx.d cc field. | 405 case 'C': { // 'Cc - Special for c.xx.d cc field. |
406 ASSERT(STRING_STARTS_WITH(format, "Cc")); | 406 DCHECK(STRING_STARTS_WITH(format, "Cc")); |
407 PrintCc(instr); | 407 PrintCc(instr); |
408 return 2; | 408 return 2; |
409 } | 409 } |
410 } | 410 } |
411 UNREACHABLE(); | 411 UNREACHABLE(); |
412 return -1; | 412 return -1; |
413 } | 413 } |
414 | 414 |
415 | 415 |
416 // Format takes a formatting string for a whole instruction and prints it into | 416 // Format takes a formatting string for a whole instruction and prints it into |
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1032 prev_pc, *reinterpret_cast<int32_t*>(prev_pc), buffer.start()); | 1032 prev_pc, *reinterpret_cast<int32_t*>(prev_pc), buffer.start()); |
1033 } | 1033 } |
1034 } | 1034 } |
1035 | 1035 |
1036 | 1036 |
1037 #undef UNSUPPORTED | 1037 #undef UNSUPPORTED |
1038 | 1038 |
1039 } // namespace disasm | 1039 } // namespace disasm |
1040 | 1040 |
1041 #endif // V8_TARGET_ARCH_MIPS | 1041 #endif // V8_TARGET_ARCH_MIPS |
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