sewardj | b8b79ad | 2008-03-03 01:35:41 +0000 | [diff] [blame] | 1 | |
| 2 | /*--------------------------------------------------------------------*/ |
| 3 | /*--- Read DWARF3 ".debug_info" sections (DIE trees). ---*/ |
| 4 | /*--- readdwarf3.c ---*/ |
| 5 | /*--------------------------------------------------------------------*/ |
| 6 | |
| 7 | /* |
| 8 | This file is part of Valgrind, a dynamic binary instrumentation |
| 9 | framework. |
| 10 | |
| 11 | Copyright (C) 2008-2008 OpenWorks LLP |
| 12 | info@open-works.co.uk |
| 13 | |
| 14 | This program is free software; you can redistribute it and/or |
| 15 | modify it under the terms of the GNU General Public License as |
| 16 | published by the Free Software Foundation; either version 2 of the |
| 17 | License, or (at your option) any later version. |
| 18 | |
| 19 | This program is distributed in the hope that it will be useful, but |
| 20 | WITHOUT ANY WARRANTY; without even the implied warranty of |
| 21 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU |
| 22 | General Public License for more details. |
| 23 | |
| 24 | You should have received a copy of the GNU General Public License |
| 25 | along with this program; if not, write to the Free Software |
| 26 | Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA |
| 27 | 02111-1307, USA. |
| 28 | |
| 29 | The GNU General Public License is contained in the file COPYING. |
| 30 | |
| 31 | Neither the names of the U.S. Department of Energy nor the |
| 32 | University of California nor the names of its contributors may be |
| 33 | used to endorse or promote products derived from this software |
| 34 | without prior written permission. |
| 35 | */ |
| 36 | |
| 37 | /* REFERENCE (without which this code will not make much sense): |
| 38 | |
| 39 | DWARF Debugging Information Format, Version 3, |
| 40 | dated 20 December 2005 (the "D3 spec"). |
| 41 | |
| 42 | Available at http://www.dwarfstd.org/Dwarf3.pdf. There's also a |
| 43 | .doc (MS Word) version, but for some reason the section numbers |
| 44 | between the Word and PDF versions differ by 1 in the first digit. |
| 45 | All section references in this code are to the PDF version. |
| 46 | |
| 47 | CURRENT HACKS: |
| 48 | |
| 49 | DW_TAG_{const,volatile}_type no DW_AT_type is allowed; it is |
| 50 | assumed to mean "const void" or "volatile void" respectively. |
| 51 | GDB appears to interpret them like this, anyway. |
| 52 | |
| 53 | In many cases it is important to know the svma of a CU (the "base |
| 54 | address of the CU", as the D3 spec calls it). There are some |
| 55 | situations in which the spec implies this value is unknown, but the |
| 56 | Dwarf3 produced by gcc-4.1 seems to assume is not unknown but |
| 57 | merely zero when not explicitly stated. So we too have to make |
| 58 | that assumption. |
| 59 | |
| 60 | TODO, 2008 Feb 17: |
| 61 | |
| 62 | get rid of cu_svma_known and document the assumed-zero svma hack. |
| 63 | |
| 64 | ML_(sizeOfType): differentiate between zero sized types and types |
| 65 | for which the size is unknown. Is this important? I don't know. |
| 66 | |
| 67 | DW_AT_array_types: deal with explicit sizes (currently we compute |
| 68 | the size from the bounds and the element size, although that's |
| 69 | fragile, if the bounds incompletely specified, or completely |
| 70 | absent) |
| 71 | |
| 72 | Document reason for difference (by 1) of stack preening depth in |
| 73 | parse_var_DIE vs parse_type_DIE. |
| 74 | |
| 75 | Don't hand to ML_(addVars), vars whose locations are entirely in |
| 76 | registers (DW_OP_reg*). This is merely a space-saving |
| 77 | optimisation, as ML_(evaluate_Dwarf3_Expr) should handle these |
| 78 | expressions correctly, by failing to evaluate them and hence |
| 79 | effectively ignoring the variable with which they are associated. |
| 80 | |
| 81 | Deal with DW_AT_array_types which have element size != stride |
| 82 | |
| 83 | In some cases, the info for a variable is split between two |
| 84 | different DIEs (generally a declarer and a definer). We punt on |
| 85 | these. Could do better here. |
| 86 | |
| 87 | The 'data_bias' argument passed to the expression evaluator |
| 88 | (ML_(evaluate_Dwarf3_Expr)) should really be changed to a |
| 89 | MaybeUWord, to make it clear when we do vs don't know what it is |
| 90 | for the evaluation of an expression. At the moment zero is passed |
| 91 | for this parameter in the don't know case. That's a bit fragile |
| 92 | and obscure; using a MaybeUWord would be clearer. |
| 93 | |
| 94 | POTENTIAL PERFORMANCE IMPROVEMENTS: |
| 95 | |
| 96 | The number of type entities that end up in the list of TyAdmins |
| 97 | rapidly becomes huge (eg, for libQtGui.so.4.3.2 (amd64-linux, size |
| 98 | 80729047 bytes), there are 786860 entries in the list). Mostly |
| 99 | this seems to be caused by g++ adding type DIEs for all the basic |
| 100 | types once for each source file contributing to the compilation |
| 101 | unit, and for a large library they add up quickly. That causes |
| 102 | both a lot of work for this reader module, and also wastes vast |
| 103 | amounts of memory storing this duplicated information. We could |
| 104 | surely do a lot better here. |
| 105 | |
| 106 | Handle interaction between read_DIE and parse_{var,type}_DIE |
| 107 | better. Currently read_DIE reads the entire DIE just to find where |
| 108 | the end is (and for debug printing), so that it can later reliably |
| 109 | move the cursor to the end regardless of what parse_{var,type}_DIE |
| 110 | do. This means many DIEs (most, even?) are read twice. It would |
| 111 | be smarter to make parse_{var,type}_DIE return a Bool indicating |
| 112 | whether or not they advanced the DIE cursor, and only if they |
| 113 | didn't should read_DIE itself read through the DIE. |
| 114 | |
| 115 | ML_(addVar) and add_var_to_arange: quite a lot of DiAddrRanges have |
| 116 | zero variables in their .vars XArray. Rather than have an XArray |
| 117 | with zero elements (which uses 2 malloc'd blocks), allow the .vars |
| 118 | pointer to be NULL in this case. |
| 119 | |
| 120 | More generally, reduce the amount of memory allocated and freed |
| 121 | while reading Dwarf3 type/variable information. Even modest (20MB) |
| 122 | objects cause this module to allocate and free hundreds of |
| 123 | thousands of small blocks, and ML_(arena_malloc) and its various |
| 124 | groupies always show up at the top of performance profiles. */ |
| 125 | |
| 126 | #include "pub_core_basics.h" |
| 127 | #include "pub_core_libcbase.h" |
| 128 | #include "pub_core_libcassert.h" |
| 129 | #include "pub_core_libcprint.h" |
| 130 | #include "pub_core_options.h" |
| 131 | #include "pub_core_xarray.h" |
| 132 | #include "priv_misc.h" /* dinfo_zalloc/free */ |
| 133 | #include "priv_tytypes.h" |
| 134 | #include "priv_d3basics.h" |
| 135 | #include "priv_storage.h" |
| 136 | #include "priv_readdwarf3.h" /* self */ |
| 137 | |
| 138 | |
| 139 | /*------------------------------------------------------------*/ |
| 140 | /*--- ---*/ |
| 141 | /*--- Basic machinery for parsing DIEs. ---*/ |
| 142 | /*--- ---*/ |
| 143 | /*------------------------------------------------------------*/ |
| 144 | |
| 145 | #define TRACE_D3(format, args...) \ |
| 146 | if (td3) { VG_(printf)(format, ## args); } |
| 147 | |
| 148 | #define D3_INVALID_CUOFF ((void*)(-1UL)) |
| 149 | #define D3_FAKEVOID_CUOFF ((void*)(-2UL)) |
| 150 | |
| 151 | typedef |
| 152 | struct { |
| 153 | UChar* region_start_img; |
| 154 | UWord region_szB; |
| 155 | UWord region_next; |
bart | aed2e4c | 2008-03-03 20:40:51 +0000 | [diff] [blame] | 156 | void (*barf)( HChar* ) __attribute__((noreturn)); |
sewardj | b8b79ad | 2008-03-03 01:35:41 +0000 | [diff] [blame] | 157 | HChar* barfstr; |
| 158 | } |
| 159 | Cursor; |
| 160 | |
| 161 | static inline Bool is_sane_Cursor ( Cursor* c ) { |
| 162 | if (!c) return False; |
| 163 | if (!c->barf) return False; |
| 164 | if (!c->barfstr) return False; |
| 165 | return True; |
| 166 | } |
| 167 | |
| 168 | static void init_Cursor ( Cursor* c, |
| 169 | UChar* region_start_img, |
| 170 | UWord region_szB, |
| 171 | UWord region_next, |
| 172 | __attribute__((noreturn)) void (*barf)( HChar* ), |
| 173 | HChar* barfstr ) |
| 174 | { |
| 175 | vg_assert(c); |
| 176 | VG_(memset)(c, 0, sizeof(*c)); |
| 177 | c->region_start_img = region_start_img; |
| 178 | c->region_szB = region_szB; |
| 179 | c->region_next = region_next; |
| 180 | c->barf = barf; |
| 181 | c->barfstr = barfstr; |
| 182 | vg_assert(is_sane_Cursor(c)); |
| 183 | } |
| 184 | |
| 185 | static Bool is_at_end_Cursor ( Cursor* c ) { |
| 186 | vg_assert(is_sane_Cursor(c)); |
| 187 | return c->region_next >= c->region_szB; |
| 188 | } |
| 189 | |
| 190 | static inline UWord get_position_of_Cursor ( Cursor* c ) { |
| 191 | vg_assert(is_sane_Cursor(c)); |
| 192 | return c->region_next; |
| 193 | } |
| 194 | static inline void set_position_of_Cursor ( Cursor* c, UWord pos ) { |
| 195 | c->region_next = pos; |
| 196 | vg_assert(is_sane_Cursor(c)); |
| 197 | } |
| 198 | |
| 199 | static /*signed*/Word get_remaining_length_Cursor ( Cursor* c ) { |
| 200 | vg_assert(is_sane_Cursor(c)); |
| 201 | return c->region_szB - c->region_next; |
| 202 | } |
| 203 | |
| 204 | static UChar* get_address_of_Cursor ( Cursor* c ) { |
| 205 | vg_assert(is_sane_Cursor(c)); |
| 206 | return &c->region_start_img[ c->region_next ]; |
| 207 | } |
| 208 | |
| 209 | __attribute__((noreturn)) |
| 210 | static void failWith ( Cursor* c, HChar* str ) { |
| 211 | vg_assert(c); |
| 212 | vg_assert(c->barf); |
| 213 | c->barf(str); |
| 214 | /*NOTREACHED*/ |
| 215 | vg_assert(0); |
| 216 | } |
| 217 | |
| 218 | /* FIXME: document assumptions on endianness for |
| 219 | get_UShort/UInt/ULong. */ |
| 220 | static inline UChar get_UChar ( Cursor* c ) { |
| 221 | UChar r; |
| 222 | /* vg_assert(is_sane_Cursor(c)); */ |
| 223 | if (c->region_next + sizeof(UChar) > c->region_szB) { |
| 224 | c->barf(c->barfstr); |
| 225 | /*NOTREACHED*/ |
| 226 | vg_assert(0); |
| 227 | } |
| 228 | r = * (UChar*) &c->region_start_img[ c->region_next ]; |
| 229 | c->region_next += sizeof(UChar); |
| 230 | return r; |
| 231 | } |
| 232 | static UShort get_UShort ( Cursor* c ) { |
| 233 | UShort r; |
| 234 | vg_assert(is_sane_Cursor(c)); |
| 235 | if (c->region_next + sizeof(UShort) > c->region_szB) { |
| 236 | c->barf(c->barfstr); |
| 237 | /*NOTREACHED*/ |
| 238 | vg_assert(0); |
| 239 | } |
| 240 | r = * (UShort*) &c->region_start_img[ c->region_next ]; |
| 241 | c->region_next += sizeof(UShort); |
| 242 | return r; |
| 243 | } |
| 244 | static UInt get_UInt ( Cursor* c ) { |
| 245 | UInt r; |
| 246 | vg_assert(is_sane_Cursor(c)); |
| 247 | if (c->region_next + sizeof(UInt) > c->region_szB) { |
| 248 | c->barf(c->barfstr); |
| 249 | /*NOTREACHED*/ |
| 250 | vg_assert(0); |
| 251 | } |
| 252 | r = * (UInt*) &c->region_start_img[ c->region_next ]; |
| 253 | c->region_next += sizeof(UInt); |
| 254 | return r; |
| 255 | } |
| 256 | static ULong get_ULong ( Cursor* c ) { |
| 257 | ULong r; |
| 258 | vg_assert(is_sane_Cursor(c)); |
| 259 | if (c->region_next + sizeof(ULong) > c->region_szB) { |
| 260 | c->barf(c->barfstr); |
| 261 | /*NOTREACHED*/ |
| 262 | vg_assert(0); |
| 263 | } |
| 264 | r = * (ULong*) &c->region_start_img[ c->region_next ]; |
| 265 | c->region_next += sizeof(ULong); |
| 266 | return r; |
| 267 | } |
| 268 | static inline ULong get_ULEB128 ( Cursor* c ) { |
| 269 | ULong result; |
| 270 | Int shift; |
| 271 | UChar byte; |
| 272 | /* unroll first iteration */ |
| 273 | byte = get_UChar( c ); |
| 274 | result = (ULong)(byte & 0x7f); |
| 275 | if (LIKELY(!(byte & 0x80))) return result; |
| 276 | shift = 7; |
| 277 | /* end unroll first iteration */ |
| 278 | do { |
| 279 | byte = get_UChar( c ); |
| 280 | result |= ((ULong)(byte & 0x7f)) << shift; |
| 281 | shift += 7; |
| 282 | } while (byte & 0x80); |
| 283 | return result; |
| 284 | } |
| 285 | static Long get_SLEB128 ( Cursor* c ) { |
| 286 | ULong result = 0; |
| 287 | Int shift = 0; |
| 288 | UChar byte; |
| 289 | do { |
| 290 | byte = get_UChar(c); |
| 291 | result |= ((ULong)(byte & 0x7f)) << shift; |
| 292 | shift += 7; |
| 293 | } while (byte & 0x80); |
| 294 | if (shift < 64 && (byte & 0x40)) |
| 295 | result |= -(1ULL << shift); |
| 296 | return result; |
| 297 | } |
| 298 | |
| 299 | /* Assume 'c' points to the start of a string. Return the absolute |
| 300 | address of whatever it points at, and advance it past the |
| 301 | terminating zero. This makes it safe for the caller to then copy |
| 302 | the string with ML_(addStr), since (w.r.t. image overruns) the |
| 303 | process of advancing past the terminating zero will already have |
| 304 | "vetted" the string. */ |
| 305 | static UChar* get_AsciiZ ( Cursor* c ) { |
| 306 | UChar uc; |
| 307 | UChar* res = get_address_of_Cursor(c); |
| 308 | do { uc = get_UChar(c); } while (uc != 0); |
| 309 | return res; |
| 310 | } |
| 311 | |
| 312 | static ULong peek_ULEB128 ( Cursor* c ) { |
| 313 | Word here = c->region_next; |
| 314 | ULong r = get_ULEB128( c ); |
| 315 | c->region_next = here; |
| 316 | return r; |
| 317 | } |
| 318 | static UChar peek_UChar ( Cursor* c ) { |
| 319 | Word here = c->region_next; |
| 320 | UChar r = get_UChar( c ); |
| 321 | c->region_next = here; |
| 322 | return r; |
| 323 | } |
| 324 | |
| 325 | static ULong get_Dwarfish_UWord ( Cursor* c, Bool is_dw64 ) { |
| 326 | return is_dw64 ? get_ULong(c) : (ULong) get_UInt(c); |
| 327 | } |
| 328 | |
| 329 | static UWord get_UWord ( Cursor* c ) { |
| 330 | vg_assert(sizeof(UWord) == sizeof(void*)); |
| 331 | if (sizeof(UWord) == 4) return get_UInt(c); |
| 332 | if (sizeof(UWord) == 8) return get_ULong(c); |
| 333 | vg_assert(0); |
| 334 | } |
| 335 | |
| 336 | |
| 337 | /* Read a DWARF3 'Initial Length' field */ |
| 338 | static ULong get_Initial_Length ( /*OUT*/Bool* is64, |
| 339 | Cursor* c, |
| 340 | HChar* barfMsg ) |
| 341 | { |
| 342 | ULong w64; |
| 343 | UInt w32; |
| 344 | *is64 = False; |
| 345 | w32 = get_UInt( c ); |
| 346 | if (w32 >= 0xFFFFFFF0 && w32 < 0xFFFFFFFF) { |
| 347 | c->barf( barfMsg ); |
| 348 | } |
| 349 | else if (w32 == 0xFFFFFFFF) { |
| 350 | *is64 = True; |
| 351 | w64 = get_ULong( c ); |
| 352 | } else { |
| 353 | *is64 = False; |
| 354 | w64 = (ULong)w32; |
| 355 | } |
| 356 | return w64; |
| 357 | } |
| 358 | |
| 359 | |
| 360 | /*------------------------------------------------------------*/ |
| 361 | /*--- ---*/ |
| 362 | /*--- "CUConst" structure ---*/ |
| 363 | /*--- ---*/ |
| 364 | /*------------------------------------------------------------*/ |
| 365 | |
| 366 | #define N_ABBV_CACHE 32 |
| 367 | |
| 368 | /* Holds information that is constant through the parsing of a |
| 369 | Compilation Unit. This is basically plumbed through to |
| 370 | everywhere. */ |
| 371 | typedef |
| 372 | struct { |
| 373 | /* Call here if anything goes wrong */ |
bart | aed2e4c | 2008-03-03 20:40:51 +0000 | [diff] [blame] | 374 | void (*barf)( HChar* ) __attribute__((noreturn)); |
sewardj | b8b79ad | 2008-03-03 01:35:41 +0000 | [diff] [blame] | 375 | /* Is this 64-bit DWARF ? */ |
| 376 | Bool is_dw64; |
| 377 | /* Which DWARF version ? (2 or 3) */ |
| 378 | UShort version; |
| 379 | /* Length of this Compilation Unit, excluding its Header */ |
| 380 | ULong unit_length; |
| 381 | /* Offset of start of this unit in .debug_info */ |
| 382 | UWord cu_start_offset; |
| 383 | /* SVMA for this CU. In the D3 spec, is known as the "base |
| 384 | address of the compilation unit (last para sec 3.1.1). |
| 385 | Needed for (amongst things) interpretation of location-list |
| 386 | values. */ |
| 387 | Addr cu_svma; |
| 388 | Bool cu_svma_known; |
| 389 | /* The debug_abbreviations table to be used for this Unit */ |
| 390 | UChar* debug_abbv; |
| 391 | /* Upper bound on size thereof (an overestimate, in general) */ |
| 392 | UWord debug_abbv_maxszB; |
| 393 | /* Where is .debug_str ? */ |
| 394 | UChar* debug_str_img; |
| 395 | UWord debug_str_sz; |
| 396 | /* Where is .debug_ranges ? */ |
| 397 | UChar* debug_ranges_img; |
| 398 | UWord debug_ranges_sz; |
| 399 | /* Where is .debug_loc ? */ |
| 400 | UChar* debug_loc_img; |
| 401 | UWord debug_loc_sz; |
| 402 | /* Where is .debug_line? */ |
| 403 | UChar* debug_line_img; |
| 404 | UWord debug_line_sz; |
| 405 | /* --- Needed so we can add stuff to the string table. --- */ |
| 406 | struct _DebugInfo* di; |
| 407 | /* --- a cache for set_abbv_Cursor --- */ |
| 408 | /* abbv_code == (ULong)-1 for an unused entry. */ |
| 409 | struct { ULong abbv_code; UWord posn; } saC_cache[N_ABBV_CACHE]; |
| 410 | UWord saC_cache_queries; |
| 411 | UWord saC_cache_misses; |
| 412 | } |
| 413 | CUConst; |
| 414 | |
| 415 | |
| 416 | /*------------------------------------------------------------*/ |
| 417 | /*--- ---*/ |
| 418 | /*--- Helper functions for Guarded Expressions ---*/ |
| 419 | /*--- ---*/ |
| 420 | /*------------------------------------------------------------*/ |
| 421 | |
| 422 | /* Parse the location list starting at img-offset 'debug_loc_offset' |
| 423 | in .debug_loc. Results are biased with 'svma_of_referencing_CU' |
| 424 | and so I believe are correct SVMAs for the object as a whole. This |
| 425 | function allocates the UChar*, and the caller must deallocate it. |
| 426 | The resulting block is in so-called Guarded-Expression format. |
| 427 | |
| 428 | Guarded-Expression format is similar but not identical to the DWARF3 |
| 429 | location-list format. The format of each returned block is: |
| 430 | |
| 431 | UChar biasMe; |
| 432 | UChar isEnd; |
| 433 | followed by zero or more of |
| 434 | |
| 435 | (Addr aMin; Addr aMax; UShort nbytes; ..bytes..; UChar isEnd) |
| 436 | |
| 437 | '..bytes..' is an standard DWARF3 location expression which is |
| 438 | valid when aMin <= pc <= aMax (possibly after suitable biasing). |
| 439 | |
| 440 | The number of bytes in '..bytes..' is nbytes. |
| 441 | |
| 442 | The end of the sequence is marked by an isEnd == 1 value. All |
| 443 | previous isEnd values must be zero. |
| 444 | |
| 445 | biasMe is 1 if the aMin/aMax fields need this DebugInfo's |
| 446 | text_bias added before use, and 0 if the GX is this is not |
| 447 | necessary (is ready to go). |
| 448 | |
| 449 | Hence the block can be quickly parsed and is self-describing. Note |
| 450 | that aMax is 1 less than the corresponding value in a DWARF3 |
| 451 | location list. Zero length ranges, with aMax == aMin-1, are not |
| 452 | allowed. |
| 453 | */ |
| 454 | void ML_(pp_GX) ( GExpr* gx ) { |
| 455 | Addr aMin, aMax; |
| 456 | UChar uc; |
| 457 | UShort nbytes; |
| 458 | UChar* p = &gx->payload[0]; |
| 459 | uc = *p++; |
| 460 | VG_(printf)("GX(%s){", uc == 0 ? "final" : "Breqd" ); |
| 461 | vg_assert(uc == 0 || uc == 1); |
| 462 | while (True) { |
| 463 | uc = *p++; |
| 464 | if (uc == 1) |
| 465 | break; /*isEnd*/ |
| 466 | vg_assert(uc == 0); |
| 467 | aMin = * (Addr*)p; p += sizeof(Addr); |
| 468 | aMax = * (Addr*)p; p += sizeof(Addr); |
| 469 | nbytes = * (UShort*)p; p += sizeof(UShort); |
| 470 | VG_(printf)("[%p,%p]=", aMin, aMax); |
| 471 | while (nbytes > 0) { |
| 472 | VG_(printf)("%02x", (UInt)*p++); |
| 473 | nbytes--; |
| 474 | } |
| 475 | if (*p == 0) |
| 476 | VG_(printf)(","); |
| 477 | } |
| 478 | VG_(printf)("}"); |
| 479 | } |
| 480 | |
| 481 | static void bias_GX ( /*MOD*/GExpr* gx, Addr bias ) |
| 482 | { |
| 483 | UShort nbytes; |
| 484 | UChar* p = &gx->payload[0]; |
| 485 | UChar uc; |
| 486 | uc = *p++; /*biasMe*/ |
| 487 | if (uc == 0) |
| 488 | return; |
| 489 | vg_assert(uc == 1); |
| 490 | p[-1] = 0; /* mark it as done */ |
| 491 | while (True) { |
| 492 | uc = *p++; |
| 493 | if (uc == 1) |
| 494 | break; /*isEnd*/ |
| 495 | vg_assert(uc == 0); |
| 496 | * ((Addr*)p) += bias; /*aMin*/ p += sizeof(Addr); |
| 497 | * ((Addr*)p) += bias; /*aMax*/ p += sizeof(Addr); |
| 498 | nbytes = * (UShort*)p; p += sizeof(UShort); |
| 499 | p += nbytes; |
| 500 | } |
| 501 | } |
| 502 | |
| 503 | __attribute__((noinline)) |
| 504 | static GExpr* make_singleton_GX ( UChar* block, UWord nbytes ) |
| 505 | { |
| 506 | SizeT bytesReqd; |
| 507 | GExpr* gx; |
| 508 | UChar *p, *pstart; |
| 509 | |
| 510 | vg_assert(sizeof(UWord) == sizeof(Addr)); |
| 511 | vg_assert(nbytes <= 0xFFFF); /* else we overflow the nbytes field */ |
| 512 | bytesReqd |
| 513 | = sizeof(UChar) /*biasMe*/ + sizeof(UChar) /*!isEnd*/ |
| 514 | + sizeof(UWord) /*aMin*/ + sizeof(UWord) /*aMax*/ |
| 515 | + sizeof(UShort) /*nbytes*/ + nbytes |
| 516 | + sizeof(UChar); /*isEnd*/ |
| 517 | |
| 518 | gx = ML_(dinfo_zalloc)( sizeof(GExpr) + bytesReqd ); |
| 519 | vg_assert(gx); |
| 520 | |
| 521 | p = pstart = &gx->payload[0]; |
| 522 | |
| 523 | * ((UChar*)p) = 0; /*biasMe*/ p += sizeof(UChar); |
| 524 | * ((UChar*)p) = 0; /*!isEnd*/ p += sizeof(UChar); |
| 525 | * ((Addr*)p) = 0; /*aMin*/ p += sizeof(Addr); |
| 526 | * ((Addr*)p) = ~((Addr)0); /*aMax */ p += sizeof(Addr); |
| 527 | * ((UShort*)p) = (UShort)nbytes; /*nbytes*/ p += sizeof(UShort); |
| 528 | VG_(memcpy)(p, block, nbytes); p += nbytes; |
| 529 | * ((UChar*)p) = 1; /*isEnd*/ p += sizeof(UChar); |
| 530 | |
| 531 | vg_assert( (SizeT)(p - pstart) == bytesReqd); |
| 532 | vg_assert( &gx->payload[bytesReqd] |
| 533 | == ((UChar*)gx) + sizeof(GExpr) + bytesReqd ); |
| 534 | |
| 535 | gx->next = NULL; |
| 536 | return gx; |
| 537 | } |
| 538 | |
| 539 | __attribute__((noinline)) |
| 540 | static GExpr* make_general_GX ( CUConst* cc, |
| 541 | Bool td3, |
| 542 | UWord debug_loc_offset, |
| 543 | Addr svma_of_referencing_CU ) |
| 544 | { |
| 545 | Addr base; |
| 546 | Cursor loc; |
| 547 | XArray* xa; /* XArray of UChar */ |
| 548 | GExpr* gx; |
| 549 | Word nbytes; |
| 550 | |
| 551 | vg_assert(sizeof(UWord) == sizeof(Addr)); |
| 552 | if (cc->debug_loc_sz == 0) |
| 553 | cc->barf("make_general_GX: .debug_loc is empty/missing"); |
| 554 | |
| 555 | init_Cursor( &loc, cc->debug_loc_img, |
| 556 | cc->debug_loc_sz, 0, cc->barf, |
| 557 | "Overrun whilst reading .debug_loc section(2)" ); |
| 558 | set_position_of_Cursor( &loc, debug_loc_offset ); |
| 559 | |
| 560 | TRACE_D3("make_general_GX (.debug_loc_offset = %lu, img = %p) {\n", |
| 561 | debug_loc_offset, get_address_of_Cursor( &loc ) ); |
| 562 | |
| 563 | /* Who frees this xa? It is freed before this fn exits. */ |
| 564 | xa = VG_(newXA)( ML_(dinfo_zalloc), ML_(dinfo_free), |
| 565 | sizeof(UChar) ); |
| 566 | |
| 567 | { UChar c = 1; /*biasMe*/ VG_(addBytesToXA)( xa, &c, sizeof(c) ); } |
| 568 | |
| 569 | base = 0; |
| 570 | while (True) { |
| 571 | Bool acquire; |
| 572 | UWord len; |
| 573 | /* Read a (host-)word pair. This is something of a hack since |
| 574 | the word size to read is really dictated by the ELF file; |
| 575 | however, we assume we're reading a file with the same |
| 576 | word-sizeness as the host. Reasonably enough. */ |
| 577 | UWord w1 = get_UWord( &loc ); |
| 578 | UWord w2 = get_UWord( &loc ); |
| 579 | |
| 580 | TRACE_D3(" %08lx %08lx\n", w1, w2); |
| 581 | if (w1 == 0 && w2 == 0) |
| 582 | break; /* end of list */ |
| 583 | |
| 584 | if (w1 == -1UL) { |
| 585 | /* new value for 'base' */ |
| 586 | base = w2; |
| 587 | continue; |
| 588 | } |
| 589 | |
| 590 | /* else a location expression follows */ |
| 591 | /* else enumerate [w1+base, w2+base) */ |
| 592 | /* w2 is 1 past end of range, as per D3 defn for "DW_AT_high_pc" |
| 593 | (sec 2.17.2) */ |
| 594 | if (w1 > w2) { |
| 595 | TRACE_D3("negative range is for .debug_loc expr at " |
| 596 | "file offset %lu\n", |
| 597 | debug_loc_offset); |
| 598 | cc->barf( "negative range in .debug_loc section" ); |
| 599 | } |
| 600 | |
| 601 | /* ignore zero length ranges */ |
| 602 | acquire = w1 < w2; |
| 603 | len = (UWord)get_UShort( &loc ); |
| 604 | |
| 605 | if (acquire) { |
| 606 | UWord w; |
| 607 | UShort s; |
| 608 | UChar c; |
| 609 | c = 0; /* !isEnd*/ |
| 610 | VG_(addBytesToXA)( xa, &c, sizeof(c) ); |
| 611 | w = w1 + base + svma_of_referencing_CU; |
| 612 | VG_(addBytesToXA)( xa, &w, sizeof(w) ); |
| 613 | w = w2 -1 + base + svma_of_referencing_CU; |
| 614 | VG_(addBytesToXA)( xa, &w, sizeof(w) ); |
| 615 | s = (UShort)len; |
| 616 | VG_(addBytesToXA)( xa, &s, sizeof(s) ); |
| 617 | } |
| 618 | |
| 619 | while (len > 0) { |
| 620 | UChar byte = get_UChar( &loc ); |
| 621 | TRACE_D3("%02x", (UInt)byte); |
| 622 | if (acquire) |
| 623 | VG_(addBytesToXA)( xa, &byte, 1 ); |
| 624 | len--; |
| 625 | } |
| 626 | TRACE_D3("\n"); |
| 627 | } |
| 628 | |
| 629 | { UChar c = 1; /*isEnd*/ VG_(addBytesToXA)( xa, &c, sizeof(c) ); } |
| 630 | |
| 631 | nbytes = VG_(sizeXA)( xa ); |
| 632 | vg_assert(nbytes >= 1); |
| 633 | |
| 634 | gx = ML_(dinfo_zalloc)( sizeof(GExpr) + nbytes ); |
| 635 | vg_assert(gx); |
| 636 | VG_(memcpy)( &gx->payload[0], (UChar*)VG_(indexXA)(xa,0), nbytes ); |
| 637 | vg_assert( &gx->payload[nbytes] |
| 638 | == ((UChar*)gx) + sizeof(GExpr) + nbytes ); |
| 639 | |
| 640 | VG_(deleteXA)( xa ); |
| 641 | |
| 642 | gx->next = NULL; |
| 643 | |
| 644 | TRACE_D3("}\n"); |
| 645 | |
| 646 | return gx; |
| 647 | } |
| 648 | |
| 649 | |
| 650 | /*------------------------------------------------------------*/ |
| 651 | /*--- ---*/ |
| 652 | /*--- Helper functions for range lists and CU headers ---*/ |
| 653 | /*--- ---*/ |
| 654 | /*------------------------------------------------------------*/ |
| 655 | |
| 656 | /* Denotes an address range. Both aMin and aMax are included in the |
| 657 | range; hence a complete range is (0, ~0) and an empty range is any |
| 658 | (X, X-1) for X > 0.*/ |
| 659 | typedef |
| 660 | struct { Addr aMin; Addr aMax; } |
| 661 | AddrRange; |
| 662 | |
| 663 | |
| 664 | __attribute__((noinline)) |
| 665 | static XArray* /* of AddrRange */ empty_range_list ( void ) |
| 666 | { |
| 667 | XArray* xa; /* XArray of AddrRange */ |
| 668 | /* Who frees this xa? varstack_preen() does. */ |
| 669 | xa = VG_(newXA)( ML_(dinfo_zalloc), ML_(dinfo_free), |
| 670 | sizeof(AddrRange) ); |
| 671 | return xa; |
| 672 | } |
| 673 | |
| 674 | |
| 675 | static XArray* unitary_range_list ( Addr aMin, Addr aMax ) |
| 676 | { |
| 677 | XArray* xa; |
| 678 | AddrRange pair; |
| 679 | vg_assert(aMin <= aMax); |
| 680 | /* Who frees this xa? varstack_preen() does. */ |
| 681 | xa = VG_(newXA)( ML_(dinfo_zalloc), ML_(dinfo_free), |
| 682 | sizeof(AddrRange) ); |
| 683 | pair.aMin = aMin; |
| 684 | pair.aMax = aMax; |
| 685 | VG_(addToXA)( xa, &pair ); |
| 686 | return xa; |
| 687 | } |
| 688 | |
| 689 | |
| 690 | /* Enumerate the address ranges starting at img-offset |
| 691 | 'debug_ranges_offset' in .debug_ranges. Results are biased with |
| 692 | 'svma_of_referencing_CU' and so I believe are correct SVMAs for the |
| 693 | object as a whole. This function allocates the XArray, and the |
| 694 | caller must deallocate it. */ |
| 695 | __attribute__((noinline)) |
| 696 | static XArray* /* of AddrRange */ |
| 697 | get_range_list ( CUConst* cc, |
| 698 | Bool td3, |
| 699 | UWord debug_ranges_offset, |
| 700 | Addr svma_of_referencing_CU ) |
| 701 | { |
| 702 | Addr base; |
| 703 | Cursor ranges; |
| 704 | XArray* xa; /* XArray of AddrRange */ |
| 705 | AddrRange pair; |
| 706 | |
| 707 | if (cc->debug_ranges_sz == 0) |
| 708 | cc->barf("get_range_list: .debug_ranges is empty/missing"); |
| 709 | |
| 710 | init_Cursor( &ranges, cc->debug_ranges_img, |
| 711 | cc->debug_ranges_sz, 0, cc->barf, |
| 712 | "Overrun whilst reading .debug_ranges section(2)" ); |
| 713 | set_position_of_Cursor( &ranges, debug_ranges_offset ); |
| 714 | |
| 715 | /* Who frees this xa? varstack_preen() does. */ |
| 716 | xa = VG_(newXA)( ML_(dinfo_zalloc), ML_(dinfo_free), |
| 717 | sizeof(AddrRange) ); |
| 718 | base = 0; |
| 719 | while (True) { |
| 720 | /* Read a (host-)word pair. This is something of a hack since |
| 721 | the word size to read is really dictated by the ELF file; |
| 722 | however, we assume we're reading a file with the same |
| 723 | word-sizeness as the host. Reasonably enough. */ |
| 724 | UWord w1 = get_UWord( &ranges ); |
| 725 | UWord w2 = get_UWord( &ranges ); |
| 726 | |
| 727 | if (w1 == 0 && w2 == 0) |
| 728 | break; /* end of list. */ |
| 729 | |
| 730 | if (w1 == -1UL) { |
| 731 | /* new value for 'base' */ |
| 732 | base = w2; |
| 733 | continue; |
| 734 | } |
| 735 | |
| 736 | /* else enumerate [w1+base, w2+base) */ |
| 737 | /* w2 is 1 past end of range, as per D3 defn for "DW_AT_high_pc" |
| 738 | (sec 2.17.2) */ |
| 739 | if (w1 > w2) |
| 740 | cc->barf( "negative range in .debug_ranges section" ); |
| 741 | if (w1 < w2) { |
| 742 | pair.aMin = w1 + base + svma_of_referencing_CU; |
| 743 | pair.aMax = w2 - 1 + base + svma_of_referencing_CU; |
| 744 | vg_assert(pair.aMin <= pair.aMax); |
| 745 | VG_(addToXA)( xa, &pair ); |
| 746 | } |
| 747 | } |
| 748 | return xa; |
| 749 | } |
| 750 | |
| 751 | |
| 752 | /* Parse the Compilation Unit header indicated at 'c' and |
| 753 | initialise 'cc' accordingly. */ |
| 754 | static __attribute__((noinline)) |
| 755 | void parse_CU_Header ( /*OUT*/CUConst* cc, |
| 756 | Bool td3, |
| 757 | Cursor* c, |
| 758 | UChar* debug_abbv_img, UWord debug_abbv_sz ) |
| 759 | { |
| 760 | UChar address_size; |
| 761 | UWord debug_abbrev_offset; |
| 762 | Int i; |
| 763 | |
| 764 | VG_(memset)(cc, 0, sizeof(*cc)); |
| 765 | vg_assert(c && c->barf); |
| 766 | cc->barf = c->barf; |
| 767 | |
| 768 | /* initial_length field */ |
| 769 | cc->unit_length |
| 770 | = get_Initial_Length( &cc->is_dw64, c, |
| 771 | "parse_CU_Header: invalid initial-length field" ); |
| 772 | |
| 773 | TRACE_D3(" Length: %lld\n", cc->unit_length ); |
| 774 | |
| 775 | /* version */ |
| 776 | cc->version = get_UShort( c ); |
| 777 | if (cc->version != 2 && cc->version != 3) |
| 778 | cc->barf( "parse_CU_Header: is neither DWARF2 nor DWARF3" ); |
| 779 | TRACE_D3(" Version: %d\n", (Int)cc->version ); |
| 780 | |
| 781 | /* debug_abbrev_offset */ |
| 782 | debug_abbrev_offset = get_Dwarfish_UWord( c, cc->is_dw64 ); |
| 783 | if (debug_abbrev_offset >= debug_abbv_sz) |
| 784 | cc->barf( "parse_CU_Header: invalid debug_abbrev_offset" ); |
| 785 | TRACE_D3(" Abbrev Offset: %ld\n", debug_abbrev_offset ); |
| 786 | |
| 787 | /* address size. If this isn't equal to the host word size, just |
| 788 | give up. This makes it safe to assume elsewhere that |
| 789 | DW_FORM_addr can be treated as a host word. */ |
| 790 | address_size = get_UChar( c ); |
| 791 | if (address_size != sizeof(void*)) |
| 792 | cc->barf( "parse_CU_Header: invalid address_size" ); |
| 793 | TRACE_D3(" Pointer Size: %d\n", (Int)address_size ); |
| 794 | |
| 795 | /* Set up so that cc->debug_abbv points to the relevant table for |
| 796 | this CU. Set the szB so that at least we can't read off the end |
| 797 | of the debug_abbrev section -- potentially (and quite likely) |
| 798 | too big, if this isn't the last table in the section, but at |
| 799 | least it's safe. */ |
| 800 | cc->debug_abbv = debug_abbv_img + debug_abbrev_offset; |
| 801 | cc->debug_abbv_maxszB = debug_abbv_sz - debug_abbrev_offset; |
| 802 | /* and empty out the set_abbv_Cursor cache */ |
| 803 | if (0) VG_(printf)("XXXXXX initialise set_abbv_Cursor cache\n"); |
| 804 | for (i = 0; i < N_ABBV_CACHE; i++) { |
| 805 | cc->saC_cache[i].abbv_code = (ULong)-1; /* unused */ |
| 806 | cc->saC_cache[i].posn = 0; |
| 807 | } |
| 808 | cc->saC_cache_queries = 0; |
| 809 | cc->saC_cache_misses = 0; |
| 810 | } |
| 811 | |
| 812 | |
| 813 | /* Set up 'c' so it is ready to parse the abbv table entry code |
| 814 | 'abbv_code' for this compilation unit. */ |
| 815 | static __attribute__((noinline)) |
| 816 | void set_abbv_Cursor ( /*OUT*/Cursor* c, Bool td3, |
| 817 | CUConst* cc, ULong abbv_code ) |
| 818 | { |
| 819 | Int i; |
| 820 | ULong acode; |
| 821 | |
| 822 | if (abbv_code == 0) |
| 823 | cc->barf("set_abbv_Cursor: abbv_code == 0" ); |
| 824 | |
| 825 | /* (ULong)-1 is used to represent an empty cache slot. So we can't |
| 826 | allow it. In any case no valid DWARF3 should make a reference |
| 827 | to a negative abbreviation code. [at least, they always seem to |
| 828 | be numbered upwards from zero as far as I have seen] */ |
| 829 | vg_assert(abbv_code != (ULong)-1); |
| 830 | |
| 831 | /* First search the cache. */ |
| 832 | if (0) VG_(printf)("XXXXXX search set_abbv_Cursor cache\n"); |
| 833 | cc->saC_cache_queries++; |
| 834 | for (i = 0; i < N_ABBV_CACHE; i++) { |
| 835 | /* No need to test the cached abbv_codes for -1 (empty), since |
| 836 | we just asserted that abbv_code is not -1. */ |
| 837 | if (cc->saC_cache[i].abbv_code == abbv_code) { |
| 838 | /* Found it. Cool. Set up the parser using the cached |
| 839 | position, and move this cache entry 1 step closer to the |
| 840 | front. */ |
| 841 | if (0) VG_(printf)("XXXXXX found in set_abbv_Cursor cache\n"); |
| 842 | init_Cursor( c, cc->debug_abbv, |
| 843 | cc->debug_abbv_maxszB, cc->saC_cache[i].posn, |
| 844 | cc->barf, |
| 845 | "Overrun whilst parsing .debug_abbrev section(1)" ); |
| 846 | if (i > 0) { |
| 847 | ULong t_abbv_code = cc->saC_cache[i].abbv_code; |
| 848 | UWord t_posn = cc->saC_cache[i].posn; |
| 849 | while (i > 0) { |
| 850 | cc->saC_cache[i] = cc->saC_cache[i-1]; |
| 851 | cc->saC_cache[0].abbv_code = t_abbv_code; |
| 852 | cc->saC_cache[0].posn = t_posn; |
| 853 | i--; |
| 854 | } |
| 855 | } |
| 856 | return; |
| 857 | } |
| 858 | } |
| 859 | |
| 860 | /* No. It's not in the cache. We have to search through |
| 861 | .debug_abbrev, of course taking care to update the cache |
| 862 | when done. */ |
| 863 | |
| 864 | cc->saC_cache_misses++; |
| 865 | init_Cursor( c, cc->debug_abbv, cc->debug_abbv_maxszB, 0, cc->barf, |
| 866 | "Overrun whilst parsing .debug_abbrev section(2)" ); |
| 867 | |
| 868 | /* Now iterate though the table until we find the requested |
| 869 | entry. */ |
| 870 | while (True) { |
| 871 | ULong atag; |
| 872 | UInt has_children; |
| 873 | acode = get_ULEB128( c ); |
| 874 | if (acode == 0) break; /* end of the table */ |
| 875 | if (acode == abbv_code) break; /* found it */ |
| 876 | atag = get_ULEB128( c ); |
| 877 | has_children = get_UChar( c ); |
| 878 | //TRACE_D3(" %llu %s [%s]\n", |
| 879 | // acode, pp_DW_TAG(atag), pp_DW_children(has_children)); |
| 880 | while (True) { |
| 881 | ULong at_name = get_ULEB128( c ); |
| 882 | ULong at_form = get_ULEB128( c ); |
| 883 | if (at_name == 0 && at_form == 0) break; |
| 884 | //TRACE_D3(" %18s %s\n", |
| 885 | // pp_DW_AT(at_name), pp_DW_FORM(at_form)); |
| 886 | } |
| 887 | } |
| 888 | |
| 889 | if (acode == 0) { |
| 890 | /* Not found. This is fatal. */ |
| 891 | cc->barf("set_abbv_Cursor: abbv_code not found"); |
| 892 | } |
| 893 | |
| 894 | /* Otherwise, 'c' is now set correctly to parse the relevant entry, |
| 895 | starting from the abbreviation entry's tag. So just cache |
| 896 | the result, and return. */ |
| 897 | for (i = N_ABBV_CACHE-1; i > N_ABBV_CACHE/2; i--) { |
| 898 | cc->saC_cache[i] = cc->saC_cache[i-1]; |
| 899 | } |
| 900 | if (0) VG_(printf)("XXXXXX update set_abbv_Cursor cache\n"); |
| 901 | cc->saC_cache[N_ABBV_CACHE/2].abbv_code = abbv_code; |
| 902 | cc->saC_cache[N_ABBV_CACHE/2].posn = get_position_of_Cursor(c); |
| 903 | } |
| 904 | |
| 905 | |
| 906 | /* From 'c', get the Form data into the lowest 1/2/4/8 bytes of *cts. |
| 907 | |
| 908 | If *cts itself contains the entire result, then *ctsSzB is set to |
| 909 | 1,2,4 or 8 accordingly and *ctsMemSzB is set to zero. |
| 910 | |
| 911 | Alternatively, the result can be a block of data (in the |
| 912 | transiently mapped-in object, so-called "image" space). If so then |
| 913 | the lowest sizeof(void*)/8 bytes of *cts hold a pointer to said |
| 914 | image, *ctsSzB is zero, and *ctsMemSzB is the size of the block. |
| 915 | |
| 916 | Unfortunately this means it is impossible to represent a zero-size |
| 917 | image block since that would have *ctsSzB == 0 and *ctsMemSzB == 0 |
| 918 | and so is ambiguous (which case it is?) |
| 919 | |
| 920 | Invariant on successful return: |
| 921 | (*ctsSzB > 0 && *ctsMemSzB == 0) |
| 922 | || (*ctsSzB == 0 && *ctsMemSzB > 0) |
| 923 | */ |
| 924 | static |
| 925 | void get_Form_contents ( /*OUT*/ULong* cts, |
| 926 | /*OUT*/Int* ctsSzB, |
| 927 | /*OUT*/UWord* ctsMemSzB, |
| 928 | CUConst* cc, Cursor* c, |
| 929 | Bool td3, DW_FORM form ) |
| 930 | { |
| 931 | *cts = 0; |
| 932 | *ctsSzB = 0; |
| 933 | *ctsMemSzB = 0; |
| 934 | switch (form) { |
| 935 | case DW_FORM_data1: |
| 936 | *cts = (ULong)(UChar)get_UChar(c); |
| 937 | *ctsSzB = 1; |
| 938 | TRACE_D3("%u", (UInt)*cts); |
| 939 | break; |
| 940 | case DW_FORM_data2: |
| 941 | *cts = (ULong)(UShort)get_UShort(c); |
| 942 | *ctsSzB = 2; |
| 943 | TRACE_D3("%u", (UInt)*cts); |
| 944 | break; |
| 945 | case DW_FORM_data4: |
| 946 | *cts = (ULong)(UInt)get_UInt(c); |
| 947 | *ctsSzB = 4; |
| 948 | TRACE_D3("%u", (UInt)*cts); |
| 949 | break; |
sewardj | 0b5bf91 | 2008-03-07 20:07:58 +0000 | [diff] [blame^] | 950 | case DW_FORM_data8: |
| 951 | *cts = get_ULong(c); |
| 952 | *ctsSzB = 8; |
| 953 | TRACE_D3("%llu", *cts); |
| 954 | break; |
sewardj | b8b79ad | 2008-03-03 01:35:41 +0000 | [diff] [blame] | 955 | case DW_FORM_sdata: |
| 956 | *cts = (ULong)(Long)get_SLEB128(c); |
| 957 | *ctsSzB = 8; |
| 958 | TRACE_D3("%lld", (Long)*cts); |
| 959 | break; |
| 960 | case DW_FORM_addr: |
| 961 | /* note, this is a hack. DW_FORM_addr is defined as getting |
| 962 | a word the size of the target machine as defined by the |
| 963 | address_size field in the CU Header. However, |
| 964 | parse_CU_Header() rejects all inputs except those for |
| 965 | which address_size == sizeof(Word), hence we can just |
| 966 | treat it as a (host) Word. */ |
| 967 | *cts = (ULong)(UWord)get_UWord(c); |
| 968 | *ctsSzB = sizeof(UWord); |
| 969 | TRACE_D3("0x%lx", (UWord)*cts); |
| 970 | break; |
| 971 | case DW_FORM_strp: { |
| 972 | /* this is an offset into .debug_str */ |
| 973 | UChar* str; |
| 974 | UWord uw = (UWord)get_Dwarfish_UWord( c, cc->is_dw64 ); |
| 975 | if (cc->debug_str_img == NULL || uw >= cc->debug_str_sz) |
| 976 | cc->barf("read_and_show_Form: DW_FORM_strp " |
| 977 | "points outside .debug_str"); |
| 978 | /* FIXME: check the entire string lies inside debug_str, |
| 979 | not just the first byte of it. */ |
| 980 | str = (UChar*)cc->debug_str_img + uw; |
| 981 | TRACE_D3("(indirect string, offset: 0x%lx): %s", uw, str); |
| 982 | *cts = (ULong)(UWord)str; |
| 983 | *ctsMemSzB = 1 + (ULong)VG_(strlen)(str); |
| 984 | break; |
| 985 | } |
| 986 | case DW_FORM_string: { |
| 987 | UChar* str = get_AsciiZ(c); |
| 988 | TRACE_D3("%s", str); |
| 989 | *cts = (ULong)(UWord)str; |
| 990 | /* strlen is safe because get_AsciiZ already 'vetted' the |
| 991 | entire string */ |
| 992 | *ctsMemSzB = 1 + (ULong)VG_(strlen)(str); |
| 993 | break; |
| 994 | } |
| 995 | case DW_FORM_ref4: { |
| 996 | UInt u32 = get_UInt(c); |
| 997 | UWord res = cc->cu_start_offset + (UWord)u32; |
| 998 | *cts = (ULong)res; |
| 999 | *ctsSzB = sizeof(UWord); |
| 1000 | TRACE_D3("<%lx>", res); |
| 1001 | break; |
| 1002 | } |
| 1003 | case DW_FORM_flag: { |
| 1004 | UChar u8 = get_UChar(c); |
| 1005 | TRACE_D3("%u", (UInt)u8); |
| 1006 | *cts = (ULong)u8; |
| 1007 | *ctsSzB = 1; |
| 1008 | break; |
| 1009 | } |
| 1010 | case DW_FORM_block1: { |
| 1011 | ULong u64b; |
| 1012 | ULong u64 = (ULong)get_UChar(c); |
| 1013 | UChar* block = get_address_of_Cursor(c); |
| 1014 | TRACE_D3("%llu byte block: ", u64); |
| 1015 | for (u64b = u64; u64b > 0; u64b--) { |
| 1016 | UChar u8 = get_UChar(c); |
| 1017 | TRACE_D3("%x ", (UInt)u8); |
| 1018 | } |
| 1019 | *cts = (ULong)(UWord)block; |
| 1020 | *ctsMemSzB = (UWord)u64; |
| 1021 | break; |
| 1022 | } |
| 1023 | default: |
| 1024 | VG_(printf)("get_Form_contents: unhandled %lld (%s)\n", |
| 1025 | form, ML_(pp_DW_FORM)(form)); |
| 1026 | c->barf("get_Form_contents: unhandled DW_FORM"); |
| 1027 | } |
| 1028 | } |
| 1029 | |
| 1030 | |
| 1031 | /*------------------------------------------------------------*/ |
| 1032 | /*--- ---*/ |
| 1033 | /*--- Parsing of variable-related DIEs ---*/ |
| 1034 | /*--- ---*/ |
| 1035 | /*------------------------------------------------------------*/ |
| 1036 | |
| 1037 | typedef |
| 1038 | struct _TempVar { |
| 1039 | struct _TempVar* next; |
| 1040 | UChar* name; /* in DebugInfo's .strchunks */ |
| 1041 | /* Represent ranges economically. nRanges is the number of |
| 1042 | ranges. Cases: |
| 1043 | 0: .rngOneMin .rngOneMax .manyRanges are all zero |
| 1044 | 1: .rngOneMin .rngOneMax hold the range; .rngMany is NULL |
| 1045 | 2: .rngOneMin .rngOneMax are zero; .rngMany holds the ranges. |
| 1046 | This is merely an optimisation to avoid having to allocate |
| 1047 | and free the XArray in the common (98%) of cases where there |
| 1048 | is zero or one address ranges. */ |
| 1049 | UWord nRanges; |
| 1050 | Addr rngOneMin; |
| 1051 | Addr rngOneMax; |
| 1052 | XArray* rngMany; /* of AddrRange. UNIQUE PTR in AR_DINFO. */ |
| 1053 | /* --- */ |
| 1054 | Int level; |
| 1055 | Type* typeR; |
| 1056 | GExpr* gexpr; /* for this variable */ |
| 1057 | GExpr* fbGX; /* to find the frame base of the enclosing fn, if |
| 1058 | any */ |
| 1059 | UChar* fName; /* declaring file name, or NULL */ |
| 1060 | Int fLine; /* declaring file line number, or zero */ |
| 1061 | /* offset in .debug_info, so that abstract instances can be |
| 1062 | found to satisfy references from concrete instances. */ |
| 1063 | UWord dioff; |
| 1064 | UWord absOri; /* so the absOri fields refer to dioff fields |
| 1065 | in some other, related TempVar. */ |
| 1066 | } |
| 1067 | TempVar; |
| 1068 | |
| 1069 | #define N_D3_VAR_STACK 24 |
| 1070 | |
| 1071 | typedef |
| 1072 | struct { |
| 1073 | /* Contains the range stack: a stack of address ranges, one |
| 1074 | stack entry for each nested scope. |
| 1075 | |
| 1076 | Some scope entries are created by function definitions |
| 1077 | (DW_AT_subprogram), and for those, we also note the GExpr |
| 1078 | derived from its DW_AT_frame_base attribute, if any. |
| 1079 | Consequently it should be possible to find, for any |
| 1080 | variable's DIE, the GExpr for the the containing function's |
| 1081 | DW_AT_frame_base by scanning back through the stack to find |
| 1082 | the nearest entry associated with a function. This somewhat |
| 1083 | elaborate scheme is provided so as to make it possible to |
| 1084 | obtain the correct DW_AT_frame_base expression even in the |
| 1085 | presence of nested functions (or to be more precise, in the |
| 1086 | presence of nested DW_AT_subprogram DIEs). |
| 1087 | */ |
| 1088 | Int sp; /* [sp] is innermost active entry; sp==-1 for empty |
| 1089 | stack */ |
| 1090 | XArray* ranges[N_D3_VAR_STACK]; /* XArray of AddrRange */ |
| 1091 | Int level[N_D3_VAR_STACK]; /* D3 DIE levels */ |
| 1092 | Bool isFunc[N_D3_VAR_STACK]; /* from DW_AT_subprogram? */ |
| 1093 | GExpr* fbGX[N_D3_VAR_STACK]; /* if isFunc, contains the FB |
| 1094 | expr, else NULL */ |
| 1095 | /* The file name table. Is a mapping from integer index to the |
| 1096 | (permanent) copy of the string, iow a non-img area. */ |
| 1097 | XArray* /* of UChar* */ filenameTable; |
| 1098 | } |
| 1099 | D3VarParser; |
| 1100 | |
| 1101 | static void varstack_show ( D3VarParser* parser, HChar* str ) { |
| 1102 | Word i, j; |
| 1103 | VG_(printf)(" varstack (%s) {\n", str); |
| 1104 | for (i = 0; i <= parser->sp; i++) { |
| 1105 | XArray* xa = parser->ranges[i]; |
| 1106 | vg_assert(xa); |
| 1107 | VG_(printf)(" [%ld] (level %d)", i, parser->level[i]); |
| 1108 | if (parser->isFunc[i]) { |
| 1109 | VG_(printf)(" (fbGX=%p)", parser->fbGX[i]); |
| 1110 | } else { |
| 1111 | vg_assert(parser->fbGX[i] == NULL); |
| 1112 | } |
| 1113 | VG_(printf)(": "); |
| 1114 | if (VG_(sizeXA)( xa ) == 0) { |
| 1115 | VG_(printf)("** empty PC range array **"); |
| 1116 | } else { |
| 1117 | for (j = 0; j < VG_(sizeXA)( xa ); j++) { |
| 1118 | AddrRange* range = (AddrRange*) VG_(indexXA)( xa, j ); |
| 1119 | vg_assert(range); |
| 1120 | VG_(printf)("[%p,%p] ", range->aMin, range->aMax); |
| 1121 | } |
| 1122 | } |
| 1123 | VG_(printf)("\n"); |
| 1124 | } |
| 1125 | VG_(printf)(" }\n"); |
| 1126 | } |
| 1127 | |
| 1128 | /* Remove from the stack, all entries with .level > 'level' */ |
| 1129 | static |
| 1130 | void varstack_preen ( D3VarParser* parser, Bool td3, Int level ) |
| 1131 | { |
| 1132 | Bool changed = False; |
| 1133 | vg_assert(parser->sp < N_D3_VAR_STACK); |
| 1134 | while (True) { |
| 1135 | vg_assert(parser->sp >= -1); |
| 1136 | if (parser->sp == -1) break; |
| 1137 | if (parser->level[parser->sp] <= level) break; |
| 1138 | if (0) |
| 1139 | TRACE_D3("BBBBAAAA varstack_pop [newsp=%d]\n", parser->sp-1); |
| 1140 | vg_assert(parser->ranges[parser->sp]); |
| 1141 | /* Who allocated this xa? get_range_list() or |
| 1142 | unitary_range_list(). */ |
| 1143 | VG_(deleteXA)( parser->ranges[parser->sp] ); |
| 1144 | parser->ranges[parser->sp] = NULL; |
| 1145 | parser->level[parser->sp] = 0; |
| 1146 | parser->isFunc[parser->sp] = False; |
| 1147 | parser->fbGX[parser->sp] = NULL; |
| 1148 | parser->sp--; |
| 1149 | changed = True; |
| 1150 | } |
| 1151 | if (changed && td3) |
| 1152 | varstack_show( parser, "after preen" ); |
| 1153 | } |
| 1154 | |
| 1155 | static void varstack_push ( CUConst* cc, |
| 1156 | D3VarParser* parser, |
| 1157 | Bool td3, |
| 1158 | XArray* ranges, Int level, |
| 1159 | Bool isFunc, GExpr* fbGX ) { |
| 1160 | if (0) |
| 1161 | TRACE_D3("BBBBAAAA varstack_push[newsp=%d]: %d %p\n", |
| 1162 | parser->sp+1, level, ranges); |
| 1163 | |
| 1164 | /* First we need to zap everything >= 'level', as we are about to |
| 1165 | replace any previous entry at 'level', so .. */ |
| 1166 | varstack_preen(parser, /*td3*/False, level-1); |
| 1167 | |
| 1168 | vg_assert(parser->sp >= -1); |
| 1169 | vg_assert(parser->sp < N_D3_VAR_STACK); |
| 1170 | if (parser->sp == N_D3_VAR_STACK-1) |
| 1171 | cc->barf("varstack_push: N_D3_VAR_STACK is too low; " |
| 1172 | "increase and recompile"); |
| 1173 | if (parser->sp >= 0) |
| 1174 | vg_assert(parser->level[parser->sp] < level); |
| 1175 | parser->sp++; |
| 1176 | vg_assert(parser->ranges[parser->sp] == NULL); |
| 1177 | vg_assert(parser->level[parser->sp] == 0); |
| 1178 | vg_assert(parser->isFunc[parser->sp] == False); |
| 1179 | vg_assert(parser->fbGX[parser->sp] == NULL); |
| 1180 | vg_assert(ranges != NULL); |
| 1181 | if (!isFunc) vg_assert(fbGX == NULL); |
| 1182 | parser->ranges[parser->sp] = ranges; |
| 1183 | parser->level[parser->sp] = level; |
| 1184 | parser->isFunc[parser->sp] = isFunc; |
| 1185 | parser->fbGX[parser->sp] = fbGX; |
| 1186 | if (td3) |
| 1187 | varstack_show( parser, "after push" ); |
| 1188 | } |
| 1189 | |
| 1190 | |
| 1191 | /* cts, ctsSzB, ctsMemSzB are derived from a DW_AT_location and so |
| 1192 | refer either to a location expression or to a location list. |
| 1193 | Figure out which, and in both cases bundle the expression or |
| 1194 | location list into a so-called GExpr (guarded expression). */ |
| 1195 | __attribute__((noinline)) |
| 1196 | static GExpr* get_GX ( CUConst* cc, Bool td3, |
| 1197 | ULong cts, Int ctsSzB, UWord ctsMemSzB ) |
| 1198 | { |
| 1199 | GExpr* gexpr = NULL; |
| 1200 | if (ctsMemSzB > 0 && ctsSzB == 0) { |
| 1201 | /* represents an in-line location expression, and cts points |
| 1202 | right at it */ |
| 1203 | gexpr = make_singleton_GX( (UChar*)(UWord)cts, ctsMemSzB ); |
| 1204 | } |
| 1205 | else |
| 1206 | if (ctsMemSzB == 0 && ctsSzB > 0) { |
| 1207 | /* represents location list. cts is the offset of it in |
| 1208 | .debug_loc. */ |
| 1209 | if (!cc->cu_svma_known) |
| 1210 | cc->barf("get_GX: location list, but CU svma is unknown"); |
| 1211 | gexpr = make_general_GX( cc, td3, (UWord)cts, cc->cu_svma ); |
| 1212 | } |
| 1213 | else { |
| 1214 | vg_assert(0); /* else caller is bogus */ |
| 1215 | } |
| 1216 | return gexpr; |
| 1217 | } |
| 1218 | |
| 1219 | |
| 1220 | static |
| 1221 | void read_filename_table( /*MOD*/D3VarParser* parser, |
| 1222 | CUConst* cc, UWord debug_line_offset, |
| 1223 | Bool td3 ) |
| 1224 | { |
| 1225 | Bool is_dw64; |
| 1226 | Cursor c; |
| 1227 | Word i; |
| 1228 | ULong unit_length; |
| 1229 | UShort version; |
| 1230 | ULong header_length; |
| 1231 | UChar minimum_instruction_length; |
| 1232 | UChar default_is_stmt; |
| 1233 | Char line_base; |
| 1234 | UChar line_range; |
| 1235 | UChar opcode_base; |
| 1236 | UChar* str; |
| 1237 | |
| 1238 | vg_assert(parser && cc && cc->barf); |
| 1239 | if ((!cc->debug_line_img) |
| 1240 | || cc->debug_line_sz <= debug_line_offset) |
| 1241 | cc->barf("read_filename_table: .debug_line is missing?"); |
| 1242 | |
| 1243 | init_Cursor( &c, cc->debug_line_img, |
| 1244 | cc->debug_line_sz, debug_line_offset, cc->barf, |
| 1245 | "Overrun whilst reading .debug_line section(1)" ); |
| 1246 | |
| 1247 | unit_length |
| 1248 | = get_Initial_Length( &is_dw64, &c, |
| 1249 | "read_filename_table: invalid initial-length field" ); |
| 1250 | version = get_UShort( &c ); |
| 1251 | if (version != 2) |
| 1252 | cc->barf("read_filename_table: Only DWARF version 2 line info " |
| 1253 | "is currently supported."); |
| 1254 | header_length = (ULong)get_Dwarfish_UWord( &c, is_dw64 ); |
| 1255 | minimum_instruction_length = get_UChar( &c ); |
| 1256 | default_is_stmt = get_UChar( &c ); |
| 1257 | line_base = (Char)get_UChar( &c ); |
| 1258 | line_range = get_UChar( &c ); |
| 1259 | opcode_base = get_UChar( &c ); |
| 1260 | /* skip over "standard_opcode_lengths" */ |
| 1261 | for (i = 1; i < (Word)opcode_base; i++) |
| 1262 | (void)get_UChar( &c ); |
| 1263 | |
| 1264 | /* skip over the directory names table */ |
| 1265 | while (peek_UChar(&c) != 0) { |
| 1266 | (void)get_AsciiZ(&c); |
| 1267 | } |
| 1268 | (void)get_UChar(&c); /* skip terminating zero */ |
| 1269 | |
| 1270 | /* Read and record the file names table */ |
| 1271 | vg_assert(parser->filenameTable); |
| 1272 | vg_assert( VG_(sizeXA)( parser->filenameTable ) == 0 ); |
| 1273 | /* Add a dummy index-zero entry. DWARF3 numbers its files |
| 1274 | from 1, for some reason. */ |
| 1275 | str = ML_(addStr)( cc->di, "<unknown_file>", -1 ); |
| 1276 | VG_(addToXA)( parser->filenameTable, &str ); |
| 1277 | while (peek_UChar(&c) != 0) { |
| 1278 | str = get_AsciiZ(&c); |
| 1279 | TRACE_D3(" read_filename_table: %ld %s\n", |
| 1280 | VG_(sizeXA)(parser->filenameTable), str); |
| 1281 | str = ML_(addStr)( cc->di, str, -1 ); |
| 1282 | VG_(addToXA)( parser->filenameTable, &str ); |
| 1283 | (void)get_ULEB128( &c ); /* skip directory index # */ |
| 1284 | (void)get_ULEB128( &c ); /* skip last mod time */ |
| 1285 | (void)get_ULEB128( &c ); /* file size */ |
| 1286 | } |
| 1287 | /* We're done! The rest of it is not interesting. */ |
| 1288 | } |
| 1289 | |
| 1290 | |
| 1291 | __attribute__((noinline)) |
| 1292 | static void parse_var_DIE ( /*OUT*/TempVar** tempvars, |
| 1293 | /*OUT*/GExpr** gexprs, |
| 1294 | /*MOD*/D3VarParser* parser, |
| 1295 | DW_TAG dtag, |
| 1296 | UWord posn, |
| 1297 | Int level, |
| 1298 | Cursor* c_die, |
| 1299 | Cursor* c_abbv, |
| 1300 | CUConst* cc, |
| 1301 | Bool td3 ) |
| 1302 | { |
| 1303 | ULong cts; |
| 1304 | Int ctsSzB; |
| 1305 | UWord ctsMemSzB; |
| 1306 | |
| 1307 | UWord saved_die_c_offset = get_position_of_Cursor( c_die ); |
| 1308 | UWord saved_abbv_c_offset = get_position_of_Cursor( c_abbv ); |
| 1309 | |
| 1310 | varstack_preen( parser, td3, level-1 ); |
| 1311 | |
| 1312 | if (dtag == DW_TAG_compile_unit) { |
| 1313 | Bool have_lo = False; |
| 1314 | Bool have_hi1 = False; |
| 1315 | Bool have_range = False; |
| 1316 | Addr ip_lo = 0; |
| 1317 | Addr ip_hi1 = 0; |
| 1318 | Addr rangeoff = 0; |
| 1319 | while (True) { |
| 1320 | DW_AT attr = (DW_AT) get_ULEB128( c_abbv ); |
| 1321 | DW_FORM form = (DW_FORM)get_ULEB128( c_abbv ); |
| 1322 | if (attr == 0 && form == 0) break; |
| 1323 | get_Form_contents( &cts, &ctsSzB, &ctsMemSzB, |
| 1324 | cc, c_die, False/*td3*/, form ); |
| 1325 | if (attr == DW_AT_low_pc && ctsSzB > 0) { |
| 1326 | ip_lo = cts; |
| 1327 | have_lo = True; |
| 1328 | } |
| 1329 | if (attr == DW_AT_high_pc && ctsSzB > 0) { |
| 1330 | ip_hi1 = cts; |
| 1331 | have_hi1 = True; |
| 1332 | } |
| 1333 | if (attr == DW_AT_ranges && ctsSzB > 0) { |
| 1334 | rangeoff = cts; |
| 1335 | have_range = True; |
| 1336 | } |
| 1337 | if (attr == DW_AT_stmt_list && ctsSzB > 0) { |
| 1338 | read_filename_table( parser, cc, (UWord)cts, td3 ); |
| 1339 | } |
| 1340 | } |
| 1341 | /* Now, does this give us an opportunity to find this |
| 1342 | CU's svma? */ |
| 1343 | #if 0 |
| 1344 | if (level == 0 && have_lo) { |
| 1345 | vg_assert(!cc->cu_svma_known); /* if this fails, it must be |
| 1346 | because we've already seen a DW_TAG_compile_unit DIE at level |
| 1347 | 0. But that can't happen, because DWARF3 only allows exactly |
| 1348 | one top level DIE per CU. */ |
| 1349 | cc->cu_svma_known = True; |
| 1350 | cc->cu_svma = ip_lo; |
| 1351 | if (1) |
| 1352 | TRACE_D3("BBBBAAAA acquire CU_SVMA of %p\n", cc->cu_svma); |
| 1353 | /* Now, it may be that this DIE doesn't tell us the CU's |
| 1354 | SVMA, by way of not having a DW_AT_low_pc. That's OK -- |
| 1355 | the CU doesn't *have* to have its SVMA specified. |
| 1356 | |
| 1357 | But as per last para D3 spec sec 3.1.1 ("Normal and |
| 1358 | Partial Compilation Unit Entries", "If the base address |
| 1359 | (viz, the SVMA) is undefined, then any DWARF entry of |
| 1360 | structure defined interms of the base address of that |
| 1361 | compilation unit is not valid.". So that means, if whilst |
| 1362 | processing the children of this top level DIE (or their |
| 1363 | children, etc) we see a DW_AT_range, and cu_svma_known is |
| 1364 | False, then the DIE that contains it is (per the spec) |
| 1365 | invalid, and we can legitimately stop and complain. */ |
| 1366 | } |
| 1367 | #else |
| 1368 | /* .. whereas The Reality is, simply assume the SVMA is zero |
| 1369 | if it isn't specified. */ |
| 1370 | if (level == 0) { |
| 1371 | vg_assert(!cc->cu_svma_known); |
| 1372 | cc->cu_svma_known = True; |
| 1373 | if (have_lo) |
| 1374 | cc->cu_svma = ip_lo; |
| 1375 | else |
| 1376 | cc->cu_svma = 0; |
| 1377 | } |
| 1378 | #endif |
| 1379 | /* Do we have something that looks sane? */ |
| 1380 | if (have_lo && have_hi1 && (!have_range)) { |
| 1381 | if (ip_lo < ip_hi1) |
| 1382 | varstack_push( cc, parser, td3, |
| 1383 | unitary_range_list(ip_lo, ip_hi1 - 1), |
| 1384 | level, |
| 1385 | False/*isFunc*/, NULL/*fbGX*/ ); |
| 1386 | } else |
| 1387 | if ((!have_lo) && (!have_hi1) && have_range) { |
| 1388 | varstack_push( cc, parser, td3, |
| 1389 | get_range_list( cc, td3, |
| 1390 | rangeoff, cc->cu_svma ), |
| 1391 | level, |
| 1392 | False/*isFunc*/, NULL/*fbGX*/ ); |
| 1393 | } else |
| 1394 | if ((!have_lo) && (!have_hi1) && (!have_range)) { |
| 1395 | /* CU has no code, presumably? */ |
| 1396 | varstack_push( cc, parser, td3, |
| 1397 | empty_range_list(), |
| 1398 | level, |
| 1399 | False/*isFunc*/, NULL/*fbGX*/ ); |
| 1400 | } else |
| 1401 | goto bad_DIE; |
| 1402 | } |
| 1403 | |
| 1404 | if (dtag == DW_TAG_lexical_block || dtag == DW_TAG_subprogram) { |
| 1405 | Bool have_lo = False; |
| 1406 | Bool have_hi1 = False; |
| 1407 | Bool have_range = False; |
| 1408 | Addr ip_lo = 0; |
| 1409 | Addr ip_hi1 = 0; |
| 1410 | Addr rangeoff = 0; |
| 1411 | Bool isFunc = dtag == DW_TAG_subprogram; |
| 1412 | GExpr* fbGX = NULL; |
| 1413 | while (True) { |
| 1414 | DW_AT attr = (DW_AT) get_ULEB128( c_abbv ); |
| 1415 | DW_FORM form = (DW_FORM)get_ULEB128( c_abbv ); |
| 1416 | if (attr == 0 && form == 0) break; |
| 1417 | get_Form_contents( &cts, &ctsSzB, &ctsMemSzB, |
| 1418 | cc, c_die, False/*td3*/, form ); |
| 1419 | if (attr == DW_AT_low_pc && ctsSzB > 0) { |
| 1420 | ip_lo = cts; |
| 1421 | have_lo = True; |
| 1422 | } |
| 1423 | if (attr == DW_AT_high_pc && ctsSzB > 0) { |
| 1424 | ip_hi1 = cts; |
| 1425 | have_hi1 = True; |
| 1426 | } |
| 1427 | if (attr == DW_AT_ranges && ctsSzB > 0) { |
| 1428 | rangeoff = cts; |
| 1429 | have_range = True; |
| 1430 | } |
| 1431 | if (isFunc |
| 1432 | && attr == DW_AT_frame_base |
| 1433 | && ((ctsMemSzB > 0 && ctsSzB == 0) |
| 1434 | || (ctsMemSzB == 0 && ctsSzB > 0))) { |
| 1435 | fbGX = get_GX( cc, False/*td3*/, cts, ctsSzB, ctsMemSzB ); |
| 1436 | vg_assert(fbGX); |
| 1437 | vg_assert(!fbGX->next); |
| 1438 | fbGX->next = *gexprs; |
| 1439 | *gexprs = fbGX; |
| 1440 | } |
| 1441 | } |
| 1442 | /* Do we have something that looks sane? */ |
| 1443 | if (dtag == DW_TAG_subprogram |
| 1444 | && (!have_lo) && (!have_hi1) && (!have_range)) { |
| 1445 | /* This is legit - ignore it. Sec 3.3.3: "A subroutine entry |
| 1446 | representing a subroutine declaration that is not also a |
| 1447 | definition does not have code address or range |
| 1448 | attributes." */ |
| 1449 | } else |
| 1450 | if (dtag == DW_TAG_lexical_block |
| 1451 | && (!have_lo) && (!have_hi1) && (!have_range)) { |
| 1452 | /* I believe this is legit, and means the lexical block |
| 1453 | contains no insns (whatever that might mean). Ignore. */ |
| 1454 | } else |
| 1455 | if (have_lo && have_hi1 && (!have_range)) { |
| 1456 | /* This scope supplies just a single address range. */ |
| 1457 | if (ip_lo < ip_hi1) |
| 1458 | varstack_push( cc, parser, td3, |
| 1459 | unitary_range_list(ip_lo, ip_hi1 - 1), |
| 1460 | level, isFunc, fbGX ); |
| 1461 | } else |
| 1462 | if ((!have_lo) && (!have_hi1) && have_range) { |
| 1463 | /* This scope supplies multiple address ranges via the use of |
| 1464 | a range list. */ |
| 1465 | varstack_push( cc, parser, td3, |
| 1466 | get_range_list( cc, td3, |
| 1467 | rangeoff, cc->cu_svma ), |
| 1468 | level, isFunc, fbGX ); |
| 1469 | } else |
| 1470 | if (have_lo && (!have_hi1) && (!have_range)) { |
| 1471 | /* This scope is bogus. The D3 spec sec 3.4 (Lexical Block |
| 1472 | Entries) says fairly clearly that a scope must have either |
| 1473 | _range or (_low_pc and _high_pc). */ |
| 1474 | /* The spec is a bit ambiguous though. Perhaps a single byte |
| 1475 | range is intended? See sec 2.17 (Code Addresses And Ranges) */ |
| 1476 | /* This case is here because icc9 produced this: |
| 1477 | <2><13bd>: DW_TAG_lexical_block |
| 1478 | DW_AT_decl_line : 5229 |
| 1479 | DW_AT_decl_column : 37 |
| 1480 | DW_AT_decl_file : 1 |
| 1481 | DW_AT_low_pc : 0x401b03 |
| 1482 | */ |
| 1483 | /* Ignore (seems safe than pushing a single byte range) */ |
| 1484 | } else |
| 1485 | goto bad_DIE; |
| 1486 | } |
| 1487 | |
| 1488 | if (dtag == DW_TAG_variable || dtag == DW_TAG_formal_parameter) { |
| 1489 | UChar* name = NULL; |
| 1490 | Type* typeR = D3_INVALID_CUOFF; |
| 1491 | Bool external = False; |
| 1492 | GExpr* gexpr = NULL; |
| 1493 | Int n_attrs = 0; |
| 1494 | UWord abs_ori = (UWord)D3_INVALID_CUOFF; |
| 1495 | Bool declaration = False; |
| 1496 | Int lineNo = 0; |
| 1497 | UChar* fileName = NULL; |
| 1498 | while (True) { |
| 1499 | DW_AT attr = (DW_AT) get_ULEB128( c_abbv ); |
| 1500 | DW_FORM form = (DW_FORM)get_ULEB128( c_abbv ); |
| 1501 | if (attr == 0 && form == 0) break; |
| 1502 | get_Form_contents( &cts, &ctsSzB, &ctsMemSzB, |
| 1503 | cc, c_die, False/*td3*/, form ); |
| 1504 | n_attrs++; |
| 1505 | if (attr == DW_AT_name && ctsMemSzB > 0) { |
| 1506 | name = ML_(addStr)( cc->di, (UChar*)(UWord)cts, -1 ); |
| 1507 | } |
| 1508 | if (attr == DW_AT_location |
| 1509 | && ((ctsMemSzB > 0 && ctsSzB == 0) |
| 1510 | || (ctsMemSzB == 0 && ctsSzB > 0))) { |
| 1511 | gexpr = get_GX( cc, False/*td3*/, cts, ctsSzB, ctsMemSzB ); |
| 1512 | vg_assert(gexpr); |
| 1513 | vg_assert(!gexpr->next); |
| 1514 | gexpr->next = *gexprs; |
| 1515 | *gexprs = gexpr; |
| 1516 | } |
| 1517 | if (attr == DW_AT_type && ctsSzB > 0) { |
| 1518 | typeR = (Type*)(UWord)cts; |
| 1519 | } |
| 1520 | if (attr == DW_AT_external && ctsSzB > 0 && cts > 0) { |
| 1521 | external = True; |
| 1522 | } |
| 1523 | if (attr == DW_AT_abstract_origin && ctsSzB > 0) { |
| 1524 | abs_ori = (UWord)cts; |
| 1525 | } |
| 1526 | if (attr == DW_AT_declaration && ctsSzB > 0 && cts > 0) { |
| 1527 | declaration = True; |
| 1528 | } |
| 1529 | if (attr == DW_AT_decl_line && ctsSzB > 0) { |
| 1530 | lineNo = (Int)cts; |
| 1531 | } |
| 1532 | if (attr == DW_AT_decl_file && ctsSzB > 0) { |
| 1533 | Int ftabIx = (Int)cts; |
| 1534 | if (ftabIx >= 1 |
| 1535 | && ftabIx < VG_(sizeXA)( parser->filenameTable )) { |
| 1536 | fileName = *(UChar**) |
| 1537 | VG_(indexXA)( parser->filenameTable, ftabIx ); |
| 1538 | vg_assert(fileName); |
| 1539 | } |
| 1540 | if (0) VG_(printf)("XXX filename = %s\n", fileName); |
| 1541 | } |
| 1542 | } |
| 1543 | /* We'll collect it under if one of the following three |
| 1544 | conditions holds: |
| 1545 | (1) has location and type -> completed |
| 1546 | (2) has type only -> is an abstract instance |
| 1547 | (3) has location and abs_ori -> is a concrete instance |
| 1548 | Name, filename and line number are all option frills. |
| 1549 | */ |
| 1550 | if ( /* 1 */ (gexpr && typeR != D3_INVALID_CUOFF) |
| 1551 | /* 2 */ || (typeR != D3_INVALID_CUOFF) |
| 1552 | /* 3 */ || (gexpr && abs_ori != (UWord)D3_INVALID_CUOFF) ) { |
| 1553 | |
| 1554 | /* Add this variable to the list of interesting looking |
| 1555 | variables. Crucially, note along with it the address |
| 1556 | range(s) associated with the variable, which for locals |
| 1557 | will be the address ranges at the top of the varparser's |
| 1558 | stack. */ |
| 1559 | GExpr* fbGX = NULL; |
| 1560 | Word i, nRanges; |
| 1561 | XArray* /* of AddrRange */ xa; |
| 1562 | TempVar* tv; |
| 1563 | /* Stack can't be empty; we put a dummy entry on it for the |
| 1564 | entire address range before starting with the DIEs for |
| 1565 | this CU. */ |
| 1566 | vg_assert(parser->sp >= 0); |
| 1567 | |
| 1568 | /* If this is a local variable (non-external), try to find |
| 1569 | the GExpr for the DW_AT_frame_base of the containing |
| 1570 | function. It should have been pushed on the stack at the |
| 1571 | time we encountered its DW_TAG_subprogram DIE, so the way |
| 1572 | to find it is to scan back down the stack looking for it. |
| 1573 | If there isn't an enclosing stack entry marked 'isFunc' |
| 1574 | then we must be seeing variable or formal param DIEs |
| 1575 | outside of a function, so we deem the Dwarf to be |
| 1576 | malformed if that happens. Note that the fbGX may be NULL |
| 1577 | if the containing DT_TAG_subprogram didn't supply a |
| 1578 | DW_AT_frame_base -- that's OK, but there must actually be |
| 1579 | a containing DW_TAG_subprogram. */ |
| 1580 | if (!external) { |
| 1581 | Bool found = False; |
| 1582 | for (i = parser->sp; i >= 0; i--) { |
| 1583 | if (parser->isFunc[i]) { |
| 1584 | fbGX = parser->fbGX[i]; |
| 1585 | found = True; |
| 1586 | break; |
| 1587 | } |
| 1588 | } |
| 1589 | if (!found) { |
| 1590 | if (0 && VG_(clo_verbosity) >= 0) { |
| 1591 | VG_(message)(Vg_DebugMsg, |
| 1592 | "warning: parse_var_DIE: non-external variable " |
| 1593 | "outside DW_TAG_subprogram"); |
| 1594 | } |
| 1595 | /* goto bad_DIE; */ |
| 1596 | /* This seems to happen a lot. Just ignore it -- if, |
| 1597 | when we come to evaluation of the location (guarded) |
| 1598 | expression, it requires a frame base value, and |
| 1599 | there's no expression for that, then evaluation as a |
| 1600 | whole will fail. Harmless - a bit of a waste of |
| 1601 | cycles but nothing more. */ |
| 1602 | } |
| 1603 | } |
| 1604 | |
| 1605 | /* re "external ? 0 : parser->sp" (twice), if the var is |
| 1606 | marked 'external' then we must put it at the global scope, |
| 1607 | as only the global scope (level 0) covers the entire PC |
| 1608 | address space. It is asserted elsewhere that level 0 |
| 1609 | always covers the entire address space. */ |
| 1610 | xa = parser->ranges[external ? 0 : parser->sp]; |
| 1611 | nRanges = VG_(sizeXA)(xa); |
| 1612 | vg_assert(nRanges >= 0); |
| 1613 | |
| 1614 | tv = ML_(dinfo_zalloc)( sizeof(TempVar) ); |
| 1615 | tv->name = name; |
| 1616 | tv->level = external ? 0 : parser->sp; |
| 1617 | tv->typeR = typeR; |
| 1618 | tv->gexpr = gexpr; |
| 1619 | tv->fbGX = fbGX; |
| 1620 | tv->fName = fileName; |
| 1621 | tv->fLine = lineNo; |
| 1622 | tv->dioff = posn; |
| 1623 | tv->absOri = abs_ori; |
| 1624 | |
| 1625 | /* See explanation on definition of type TempVar for the |
| 1626 | reason for this elaboration. */ |
| 1627 | tv->nRanges = nRanges; |
| 1628 | tv->rngOneMin = 0; |
| 1629 | tv->rngOneMax = 0; |
| 1630 | tv->rngMany = NULL; |
| 1631 | if (nRanges == 1) { |
| 1632 | AddrRange* range = VG_(indexXA)(xa, 0); |
| 1633 | tv->rngOneMin = range->aMin; |
| 1634 | tv->rngOneMax = range->aMax; |
| 1635 | } |
| 1636 | else if (nRanges > 1) { |
| 1637 | tv->rngMany = VG_(cloneXA)( xa ); /* free when 'tv' freed */ |
| 1638 | } |
| 1639 | |
| 1640 | tv->next = *tempvars; |
| 1641 | *tempvars = tv; |
| 1642 | |
| 1643 | TRACE_D3(" Recording this variable, with %ld PC range(s)\n", |
| 1644 | VG_(sizeXA)(xa) ); |
| 1645 | /* collect stats on how effective the ->ranges special |
| 1646 | casing is */ |
| 1647 | if (0) { |
| 1648 | static Int ntot=0, ngt=0; |
| 1649 | ntot++; |
| 1650 | if (tv->rngMany) ngt++; |
| 1651 | if (0 == (ntot % 100000)) |
| 1652 | VG_(printf)("XXXX %d tot, %d cloned\n", ntot, ngt); |
| 1653 | } |
| 1654 | |
| 1655 | } |
| 1656 | |
| 1657 | /* Here are some other weird cases seen in the wild: |
| 1658 | |
| 1659 | We have a variable with a name and a type, but no |
| 1660 | location. I guess that's a sign that it has been |
| 1661 | optimised away. Ignore it. Here's an example: |
| 1662 | |
| 1663 | static Int lc_compar(void* n1, void* n2) { |
| 1664 | MC_Chunk* mc1 = *(MC_Chunk**)n1; |
| 1665 | MC_Chunk* mc2 = *(MC_Chunk**)n2; |
| 1666 | return (mc1->data < mc2->data ? -1 : 1); |
| 1667 | } |
| 1668 | |
| 1669 | Both mc1 and mc2 are like this |
| 1670 | <2><5bc>: Abbrev Number: 21 (DW_TAG_variable) |
| 1671 | DW_AT_name : mc1 |
| 1672 | DW_AT_decl_file : 1 |
| 1673 | DW_AT_decl_line : 216 |
| 1674 | DW_AT_type : <5d3> |
| 1675 | |
| 1676 | whereas n1 and n2 do have locations specified. |
| 1677 | |
| 1678 | --------------------------------------------- |
| 1679 | |
| 1680 | We see a DW_TAG_formal_parameter with a type, but |
| 1681 | no name and no location. It's probably part of a function type |
| 1682 | construction, thusly, hence ignore it: |
| 1683 | <1><2b4>: Abbrev Number: 12 (DW_TAG_subroutine_type) |
| 1684 | DW_AT_sibling : <2c9> |
| 1685 | DW_AT_prototyped : 1 |
| 1686 | DW_AT_type : <114> |
| 1687 | <2><2be>: Abbrev Number: 13 (DW_TAG_formal_parameter) |
| 1688 | DW_AT_type : <13e> |
| 1689 | <2><2c3>: Abbrev Number: 13 (DW_TAG_formal_parameter) |
| 1690 | DW_AT_type : <133> |
| 1691 | |
| 1692 | --------------------------------------------- |
| 1693 | |
| 1694 | Is very minimal, like this: |
| 1695 | <4><81d>: Abbrev Number: 44 (DW_TAG_variable) |
| 1696 | DW_AT_abstract_origin: <7ba> |
| 1697 | What that signifies I have no idea. Ignore. |
| 1698 | |
| 1699 | ---------------------------------------------- |
| 1700 | |
| 1701 | Is very minimal, like this: |
| 1702 | <200f>: DW_TAG_formal_parameter |
| 1703 | DW_AT_abstract_ori: <1f4c> |
| 1704 | DW_AT_location : 13440 |
| 1705 | What that signifies I have no idea. Ignore. |
| 1706 | It might be significant, though: the variable at least |
| 1707 | has a location and so might exist somewhere. |
| 1708 | Maybe we should handle this. |
| 1709 | |
| 1710 | --------------------------------------------- |
| 1711 | |
| 1712 | <22407>: DW_TAG_variable |
| 1713 | DW_AT_name : (indirect string, offset: 0x6579): |
| 1714 | vgPlain_trampoline_stuff_start |
| 1715 | DW_AT_decl_file : 29 |
| 1716 | DW_AT_decl_line : 56 |
| 1717 | DW_AT_external : 1 |
| 1718 | DW_AT_declaration : 1 |
| 1719 | |
| 1720 | Nameless and typeless variable that has a location? Who |
| 1721 | knows. Not me. |
| 1722 | <2><3d178>: Abbrev Number: 22 (DW_TAG_variable) |
| 1723 | DW_AT_location : 9 byte block: 3 c0 c7 13 38 0 0 0 0 |
| 1724 | (DW_OP_addr: 3813c7c0) |
| 1725 | |
| 1726 | No, really. Check it out. gcc is quite simply borked. |
| 1727 | <3><168cc>: Abbrev Number: 141 (DW_TAG_variable) |
| 1728 | // followed by no attributes, and the next DIE is a sibling, |
| 1729 | // not a child |
| 1730 | */ |
| 1731 | } |
| 1732 | return; |
| 1733 | |
| 1734 | bad_DIE: |
| 1735 | set_position_of_Cursor( c_die, saved_die_c_offset ); |
| 1736 | set_position_of_Cursor( c_abbv, saved_abbv_c_offset ); |
| 1737 | VG_(printf)("\nparse_var_DIE: confused by:\n"); |
| 1738 | VG_(printf)(" <%d><%lx>: %s\n", level, posn, ML_(pp_DW_TAG)( dtag ) ); |
| 1739 | while (True) { |
| 1740 | DW_AT attr = (DW_AT) get_ULEB128( c_abbv ); |
| 1741 | DW_FORM form = (DW_FORM)get_ULEB128( c_abbv ); |
| 1742 | if (attr == 0 && form == 0) break; |
| 1743 | VG_(printf)(" %18s: ", ML_(pp_DW_AT)(attr)); |
| 1744 | /* Get the form contents, so as to print them */ |
| 1745 | get_Form_contents( &cts, &ctsSzB, &ctsMemSzB, |
| 1746 | cc, c_die, True, form ); |
| 1747 | VG_(printf)("\t\n"); |
| 1748 | } |
| 1749 | VG_(printf)("\n"); |
| 1750 | cc->barf("parse_var_DIE: confused by the above DIE"); |
| 1751 | /*NOTREACHED*/ |
| 1752 | } |
| 1753 | |
| 1754 | |
| 1755 | /*------------------------------------------------------------*/ |
| 1756 | /*--- ---*/ |
| 1757 | /*--- Parsing of type-related DIEs ---*/ |
| 1758 | /*--- ---*/ |
| 1759 | /*------------------------------------------------------------*/ |
| 1760 | |
| 1761 | #define N_D3_TYPE_STACK 16 |
| 1762 | |
| 1763 | typedef |
| 1764 | struct { |
| 1765 | /* What source language? 'C'=C/C++, 'F'=Fortran, '?'=other |
| 1766 | Established once per compilation unit. */ |
| 1767 | UChar language; |
| 1768 | /* A stack of types which are currently under construction */ |
| 1769 | Int sp; /* [sp] is innermost active entry; sp==-1 for empty |
| 1770 | stack */ |
| 1771 | Type* qparent[N_D3_TYPE_STACK]; |
| 1772 | Int qlevel[N_D3_TYPE_STACK]; |
| 1773 | |
| 1774 | } |
| 1775 | D3TypeParser; |
| 1776 | |
| 1777 | static void typestack_show ( D3TypeParser* parser, HChar* str ) { |
| 1778 | Word i; |
| 1779 | VG_(printf)(" typestack (%s) {\n", str); |
| 1780 | for (i = 0; i <= parser->sp; i++) { |
| 1781 | VG_(printf)(" [%ld] (level %d): ", i, parser->qlevel[i]); |
| 1782 | ML_(pp_Type)( parser->qparent[i] ); |
| 1783 | VG_(printf)("\n"); |
| 1784 | } |
| 1785 | VG_(printf)(" }\n"); |
| 1786 | } |
| 1787 | |
| 1788 | /* Remove from the stack, all entries with .level > 'level' */ |
| 1789 | static |
| 1790 | void typestack_preen ( D3TypeParser* parser, Bool td3, Int level ) |
| 1791 | { |
| 1792 | Bool changed = False; |
| 1793 | vg_assert(parser->sp < N_D3_TYPE_STACK); |
| 1794 | while (True) { |
| 1795 | vg_assert(parser->sp >= -1); |
| 1796 | if (parser->sp == -1) break; |
| 1797 | if (parser->qlevel[parser->sp] <= level) break; |
| 1798 | if (0) |
| 1799 | TRACE_D3("BBBBAAAA typestack_pop [newsp=%d]\n", parser->sp-1); |
| 1800 | vg_assert(parser->qparent[parser->sp]); |
| 1801 | parser->qparent[parser->sp] = NULL; |
| 1802 | parser->qlevel[parser->sp] = 0; |
| 1803 | parser->sp--; |
| 1804 | changed = True; |
| 1805 | } |
| 1806 | if (changed && td3) |
| 1807 | typestack_show( parser, "after preen" ); |
| 1808 | } |
| 1809 | |
| 1810 | static Bool typestack_is_empty ( D3TypeParser* parser ) { |
| 1811 | vg_assert(parser->sp >= -1 && parser->sp < N_D3_TYPE_STACK); |
| 1812 | return parser->sp == -1; |
| 1813 | } |
| 1814 | |
| 1815 | static void typestack_push ( CUConst* cc, |
| 1816 | D3TypeParser* parser, |
| 1817 | Bool td3, |
| 1818 | Type* parent, Int level ) { |
| 1819 | if (0) |
| 1820 | TRACE_D3("BBBBAAAA typestack_push[newsp=%d]: %d %p\n", |
| 1821 | parser->sp+1, level, parent); |
| 1822 | |
| 1823 | /* First we need to zap everything >= 'level', as we are about to |
| 1824 | replace any previous entry at 'level', so .. */ |
| 1825 | typestack_preen(parser, /*td3*/False, level-1); |
| 1826 | |
| 1827 | vg_assert(parser->sp >= -1); |
| 1828 | vg_assert(parser->sp < N_D3_TYPE_STACK); |
| 1829 | if (parser->sp == N_D3_TYPE_STACK-1) |
| 1830 | cc->barf("typestack_push: N_D3_TYPE_STACK is too low; " |
| 1831 | "increase and recompile"); |
| 1832 | if (parser->sp >= 0) |
| 1833 | vg_assert(parser->qlevel[parser->sp] < level); |
| 1834 | parser->sp++; |
| 1835 | vg_assert(parser->qparent[parser->sp] == NULL); |
| 1836 | vg_assert(parser->qlevel[parser->sp] == 0); |
| 1837 | vg_assert(parent != NULL); |
| 1838 | parser->qparent[parser->sp] = parent; |
| 1839 | parser->qlevel[parser->sp] = level; |
| 1840 | if (td3) |
| 1841 | typestack_show( parser, "after push" ); |
| 1842 | } |
| 1843 | |
| 1844 | |
| 1845 | /* Parse a type-related DIE. 'parser' holds the current parser state. |
| 1846 | 'admin' is where the completed types are dumped. 'dtag' is the tag |
| 1847 | for this DIE. 'c_die' points to the start of the data fields (FORM |
| 1848 | stuff) for the DIE. c_abbv points to the start of the (name,form) |
| 1849 | pairs which describe the DIE. |
| 1850 | |
| 1851 | We may find the DIE uninteresting, in which case we should ignore |
| 1852 | it. |
| 1853 | */ |
| 1854 | __attribute__((noinline)) |
| 1855 | static void parse_type_DIE ( /*OUT*/TyAdmin** admin, |
| 1856 | /*MOD*/D3TypeParser* parser, |
| 1857 | DW_TAG dtag, |
| 1858 | UWord posn, |
| 1859 | Int level, |
| 1860 | Cursor* c_die, |
| 1861 | Cursor* c_abbv, |
| 1862 | CUConst* cc, |
| 1863 | Bool td3 ) |
| 1864 | { |
| 1865 | ULong cts; |
| 1866 | Int ctsSzB; |
| 1867 | UWord ctsMemSzB; |
| 1868 | Type* type = NULL; |
| 1869 | TyAtom* atom = NULL; |
| 1870 | TyField* field = NULL; |
| 1871 | D3Expr* expr = NULL; |
| 1872 | TyBounds* bounds = NULL; |
| 1873 | |
| 1874 | UWord saved_die_c_offset = get_position_of_Cursor( c_die ); |
| 1875 | UWord saved_abbv_c_offset = get_position_of_Cursor( c_abbv ); |
| 1876 | |
| 1877 | /* If we've returned to a level at or above any previously noted |
| 1878 | parent, un-note it, so we don't believe we're still collecting |
| 1879 | its children. */ |
| 1880 | typestack_preen( parser, td3, level-1 ); |
| 1881 | |
| 1882 | if (dtag == DW_TAG_compile_unit) { |
| 1883 | /* See if we can find DW_AT_language, since it is important for |
| 1884 | establishing array bounds (see DW_TAG_subrange_type below in |
| 1885 | this fn) */ |
| 1886 | while (True) { |
| 1887 | DW_AT attr = (DW_AT) get_ULEB128( c_abbv ); |
| 1888 | DW_FORM form = (DW_FORM)get_ULEB128( c_abbv ); |
| 1889 | if (attr == 0 && form == 0) break; |
| 1890 | get_Form_contents( &cts, &ctsSzB, &ctsMemSzB, |
| 1891 | cc, c_die, False/*td3*/, form ); |
| 1892 | if (attr != DW_AT_language) |
| 1893 | continue; |
| 1894 | if (ctsSzB == 0) |
| 1895 | goto bad_DIE; |
| 1896 | switch (cts) { |
| 1897 | case DW_LANG_C89: case DW_LANG_C: |
| 1898 | case DW_LANG_C_plus_plus: case DW_LANG_ObjC: |
| 1899 | case DW_LANG_ObjC_plus_plus: case DW_LANG_UPC: |
| 1900 | case DW_LANG_Upc: |
| 1901 | parser->language = 'C'; break; |
| 1902 | case DW_LANG_Fortran77: case DW_LANG_Fortran90: |
| 1903 | case DW_LANG_Fortran95: |
| 1904 | parser->language = 'F'; break; |
| 1905 | case DW_LANG_Ada83: case DW_LANG_Cobol74: |
| 1906 | case DW_LANG_Cobol85: case DW_LANG_Pascal83: |
| 1907 | case DW_LANG_Modula2: case DW_LANG_Java: |
| 1908 | case DW_LANG_C99: case DW_LANG_Ada95: |
| 1909 | case DW_LANG_PLI: case DW_LANG_D: |
| 1910 | case DW_LANG_Mips_Assembler: |
| 1911 | parser->language = '?'; break; |
| 1912 | default: |
| 1913 | goto bad_DIE; |
| 1914 | } |
| 1915 | } |
| 1916 | } |
| 1917 | |
| 1918 | if (dtag == DW_TAG_base_type) { |
| 1919 | /* We can pick up a new base type any time. */ |
| 1920 | type = ML_(new_Type)(); |
| 1921 | type->tag = Ty_Base; |
| 1922 | while (True) { |
| 1923 | DW_AT attr = (DW_AT) get_ULEB128( c_abbv ); |
| 1924 | DW_FORM form = (DW_FORM)get_ULEB128( c_abbv ); |
| 1925 | if (attr == 0 && form == 0) break; |
| 1926 | get_Form_contents( &cts, &ctsSzB, &ctsMemSzB, |
| 1927 | cc, c_die, False/*td3*/, form ); |
| 1928 | if (attr == DW_AT_name && ctsMemSzB > 0) { |
| 1929 | type->Ty.Base.name |
| 1930 | = ML_(addStr)( cc->di, (UChar*)(UWord)cts, -1 ); |
| 1931 | } |
| 1932 | if (attr == DW_AT_byte_size && ctsSzB > 0) { |
| 1933 | type->Ty.Base.szB = cts; |
| 1934 | } |
| 1935 | if (attr == DW_AT_encoding && ctsSzB > 0) { |
| 1936 | switch (cts) { |
| 1937 | case DW_ATE_unsigned: case DW_ATE_unsigned_char: |
| 1938 | case DW_ATE_boolean:/* FIXME - is this correct? */ |
| 1939 | type->Ty.Base.enc = 'U'; break; |
| 1940 | case DW_ATE_signed: case DW_ATE_signed_char: |
| 1941 | type->Ty.Base.enc = 'S'; break; |
| 1942 | case DW_ATE_float: |
| 1943 | type->Ty.Base.enc = 'F'; break; |
| 1944 | case DW_ATE_complex_float: |
| 1945 | type->Ty.Base.enc = 'C'; break; |
| 1946 | default: |
| 1947 | goto bad_DIE; |
| 1948 | } |
| 1949 | } |
| 1950 | } |
| 1951 | |
| 1952 | /* Invent a name if it doesn't have one. gcc-4.3 |
| 1953 | -ftree-vectorize is observed to emit nameless base types. */ |
| 1954 | if (!type->Ty.Base.name) |
| 1955 | type->Ty.Base.name |
| 1956 | = ML_(addStr)( cc->di, "<anon_base_type>", -1 ); |
| 1957 | |
| 1958 | /* Do we have something that looks sane? */ |
| 1959 | if (/* must have a name */ |
| 1960 | type->Ty.Base.name == NULL |
| 1961 | /* and a plausible size. Yes, really 32: "complex long |
| 1962 | double" apparently has size=32 */ |
| 1963 | || type->Ty.Base.szB < 0 || type->Ty.Base.szB > 32 |
| 1964 | /* and a plausible encoding */ |
| 1965 | || (type->Ty.Base.enc != 'U' |
| 1966 | && type->Ty.Base.enc != 'S' |
| 1967 | && type->Ty.Base.enc != 'F' |
| 1968 | && type->Ty.Base.enc != 'C')) |
| 1969 | goto bad_DIE; |
| 1970 | /* Last minute hack: if we see this |
| 1971 | <1><515>: DW_TAG_base_type |
| 1972 | DW_AT_byte_size : 0 |
| 1973 | DW_AT_encoding : 5 |
| 1974 | DW_AT_name : void |
| 1975 | convert it into a real Void type. */ |
| 1976 | if (type->Ty.Base.szB == 0 |
| 1977 | && 0 == VG_(strcmp)("void", type->Ty.Base.name)) { |
| 1978 | VG_(memset)(type, 0, sizeof(*type)); |
| 1979 | type->tag = Ty_Void; |
| 1980 | type->Ty.Void.isFake = False; /* it's a real one! */ |
| 1981 | } |
| 1982 | goto acquire_Type; |
| 1983 | } |
| 1984 | |
| 1985 | if (dtag == DW_TAG_pointer_type || dtag == DW_TAG_reference_type |
| 1986 | || dtag == DW_TAG_ptr_to_member_type) { |
| 1987 | /* This seems legit for _pointer_type and _reference_type. I |
| 1988 | don't know if rolling _ptr_to_member_type in here really is |
| 1989 | legit, but it's better than not handling it at all. */ |
| 1990 | type = ML_(new_Type)(); |
| 1991 | type->tag = Ty_PorR; |
| 1992 | /* target type defaults to void */ |
| 1993 | type->Ty.PorR.typeR = D3_FAKEVOID_CUOFF; |
| 1994 | type->Ty.PorR.isPtr = dtag == DW_TAG_pointer_type |
| 1995 | || dtag == DW_TAG_ptr_to_member_type; |
| 1996 | /* Pointer types don't *have* to specify their size, in which |
| 1997 | case we assume it's a machine word. But if they do specify |
| 1998 | it, it must be a machine word :-) This probably assumes that |
| 1999 | the word size of the Dwarf3 we're reading is the same size as |
| 2000 | that on the machine. gcc appears to give a size whereas icc9 |
| 2001 | doesn't. */ |
| 2002 | if (type->Ty.PorR.isPtr) |
| 2003 | type->Ty.PorR.szB = sizeof(Word); |
| 2004 | while (True) { |
| 2005 | DW_AT attr = (DW_AT) get_ULEB128( c_abbv ); |
| 2006 | DW_FORM form = (DW_FORM)get_ULEB128( c_abbv ); |
| 2007 | if (attr == 0 && form == 0) break; |
| 2008 | get_Form_contents( &cts, &ctsSzB, &ctsMemSzB, |
| 2009 | cc, c_die, False/*td3*/, form ); |
| 2010 | if (attr == DW_AT_byte_size && ctsSzB > 0) { |
| 2011 | type->Ty.PorR.szB = cts; |
| 2012 | } |
| 2013 | if (attr == DW_AT_type && ctsSzB > 0) { |
| 2014 | type->Ty.PorR.typeR = (Type*)(UWord)cts; |
| 2015 | } |
| 2016 | } |
| 2017 | /* Do we have something that looks sane? */ |
| 2018 | if (type->Ty.PorR.szB != sizeof(Word)) |
| 2019 | goto bad_DIE; |
| 2020 | else |
| 2021 | goto acquire_Type; |
| 2022 | } |
| 2023 | |
| 2024 | if (dtag == DW_TAG_enumeration_type) { |
| 2025 | /* Create a new Type to hold the results. */ |
| 2026 | type = ML_(new_Type)(); |
| 2027 | type->tag = Ty_Enum; |
| 2028 | type->Ty.Enum.name = NULL; |
| 2029 | type->Ty.Enum.atomRs |
| 2030 | = VG_(newXA)( ML_(dinfo_zalloc), ML_(dinfo_free), |
| 2031 | sizeof(TyAtom*) ); |
| 2032 | while (True) { |
| 2033 | DW_AT attr = (DW_AT) get_ULEB128( c_abbv ); |
| 2034 | DW_FORM form = (DW_FORM)get_ULEB128( c_abbv ); |
| 2035 | if (attr == 0 && form == 0) break; |
| 2036 | get_Form_contents( &cts, &ctsSzB, &ctsMemSzB, |
| 2037 | cc, c_die, False/*td3*/, form ); |
| 2038 | if (attr == DW_AT_name && ctsMemSzB > 0) { |
| 2039 | type->Ty.Enum.name |
| 2040 | = ML_(addStr)( cc->di, (UChar*)(UWord)cts, -1 ); |
| 2041 | } |
| 2042 | if (attr == DW_AT_byte_size && ctsSzB > 0) { |
| 2043 | type->Ty.Enum.szB = cts; |
| 2044 | } |
| 2045 | } |
| 2046 | /* Do we have something that looks sane? */ |
| 2047 | if (type->Ty.Enum.szB == 0 /* we must know the size */ |
| 2048 | /* But the name can be present, or not */) |
| 2049 | goto bad_DIE; |
| 2050 | /* On't stack! */ |
| 2051 | typestack_push( cc, parser, td3, type, level ); |
| 2052 | goto acquire_Type; |
| 2053 | } |
| 2054 | |
| 2055 | if (dtag == DW_TAG_enumerator) { |
| 2056 | Bool have_value = False; |
| 2057 | atom = ML_(new_TyAtom)( NULL, 0 ); |
| 2058 | while (True) { |
| 2059 | DW_AT attr = (DW_AT) get_ULEB128( c_abbv ); |
| 2060 | DW_FORM form = (DW_FORM)get_ULEB128( c_abbv ); |
| 2061 | if (attr == 0 && form == 0) break; |
| 2062 | get_Form_contents( &cts, &ctsSzB, &ctsMemSzB, |
| 2063 | cc, c_die, False/*td3*/, form ); |
| 2064 | if (attr == DW_AT_name && ctsMemSzB > 0) { |
| 2065 | atom->name = ML_(addStr)( cc->di, (UChar*)(UWord)cts, -1 ); |
| 2066 | } |
| 2067 | if (attr == DW_AT_const_value && ctsSzB > 0) { |
| 2068 | atom->value = cts; |
| 2069 | have_value = True; |
| 2070 | } |
| 2071 | } |
| 2072 | /* Do we have something that looks sane? */ |
| 2073 | if ((!have_value) || atom->name == NULL) |
| 2074 | goto bad_DIE; |
| 2075 | /* Do we have a plausible parent? */ |
| 2076 | if (typestack_is_empty(parser)) goto bad_DIE; |
| 2077 | vg_assert(parser->qparent[parser->sp]); |
| 2078 | if (level != parser->qlevel[parser->sp]+1) goto bad_DIE; |
| 2079 | if (parser->qparent[parser->sp]->tag != Ty_Enum) goto bad_DIE; |
| 2080 | /* Record this child in the parent */ |
| 2081 | vg_assert(parser->qparent[parser->sp]->Ty.Enum.atomRs); |
| 2082 | VG_(addToXA)( parser->qparent[parser->sp]->Ty.Enum.atomRs, &atom ); |
| 2083 | /* And record the child itself */ |
| 2084 | goto acquire_Atom; |
| 2085 | } |
| 2086 | |
| 2087 | if (dtag == DW_TAG_structure_type || dtag == DW_TAG_union_type) { |
| 2088 | Bool have_szB = False; |
| 2089 | Bool is_decl = False; |
| 2090 | Bool is_spec = False; |
| 2091 | /* Create a new Type to hold the results. */ |
| 2092 | type = ML_(new_Type)(); |
| 2093 | type->tag = Ty_StOrUn; |
| 2094 | type->Ty.StOrUn.name = NULL; |
| 2095 | type->Ty.StOrUn.fields |
| 2096 | = VG_(newXA)( ML_(dinfo_zalloc), ML_(dinfo_free), |
| 2097 | sizeof(TyAtom*) ); |
| 2098 | type->Ty.StOrUn.complete = True; |
| 2099 | type->Ty.StOrUn.isStruct = dtag == DW_TAG_structure_type; |
| 2100 | while (True) { |
| 2101 | DW_AT attr = (DW_AT) get_ULEB128( c_abbv ); |
| 2102 | DW_FORM form = (DW_FORM)get_ULEB128( c_abbv ); |
| 2103 | if (attr == 0 && form == 0) break; |
| 2104 | get_Form_contents( &cts, &ctsSzB, &ctsMemSzB, |
| 2105 | cc, c_die, False/*td3*/, form ); |
| 2106 | if (attr == DW_AT_name && ctsMemSzB > 0) { |
| 2107 | type->Ty.StOrUn.name |
| 2108 | = ML_(addStr)( cc->di, (UChar*)(UWord)cts, -1 ); |
| 2109 | } |
| 2110 | if (attr == DW_AT_byte_size && ctsSzB >= 0) { |
| 2111 | type->Ty.StOrUn.szB = cts; |
| 2112 | have_szB = True; |
| 2113 | } |
| 2114 | if (attr == DW_AT_declaration && ctsSzB > 0 && cts > 0) { |
| 2115 | is_decl = True; |
| 2116 | } |
| 2117 | if (attr == DW_AT_specification && ctsSzB > 0 && cts > 0) { |
| 2118 | is_spec = True; |
| 2119 | } |
| 2120 | } |
| 2121 | /* Do we have something that looks sane? */ |
| 2122 | if (is_decl && (!is_spec)) { |
| 2123 | /* It's a DW_AT_declaration. We require the name but |
| 2124 | nothing else. */ |
| 2125 | if (type->Ty.StOrUn.name == NULL) |
| 2126 | goto bad_DIE; |
| 2127 | type->Ty.StOrUn.complete = False; |
| 2128 | goto acquire_Type; |
| 2129 | } |
| 2130 | if ((!is_decl) /* && (!is_spec) */) { |
| 2131 | /* this is the common, ordinary case */ |
| 2132 | if ((!have_szB) /* we must know the size */ |
| 2133 | /* But the name can be present, or not */) |
| 2134 | goto bad_DIE; |
| 2135 | /* On't stack! */ |
| 2136 | typestack_push( cc, parser, td3, type, level ); |
| 2137 | goto acquire_Type; |
| 2138 | } |
| 2139 | else { |
| 2140 | /* don't know how to handle any other variants just now */ |
| 2141 | goto bad_DIE; |
| 2142 | } |
| 2143 | } |
| 2144 | |
| 2145 | if (dtag == DW_TAG_member) { |
| 2146 | /* Acquire member entries for both DW_TAG_structure_type and |
| 2147 | DW_TAG_union_type. They differ minorly, in that struct |
| 2148 | members must have a DW_AT_data_member_location expression |
| 2149 | whereas union members must not. */ |
| 2150 | Bool parent_is_struct; |
| 2151 | field = ML_(new_TyField)( NULL, NULL, NULL ); |
| 2152 | field->typeR = D3_INVALID_CUOFF; |
| 2153 | expr = NULL; |
| 2154 | while (True) { |
| 2155 | DW_AT attr = (DW_AT) get_ULEB128( c_abbv ); |
| 2156 | DW_FORM form = (DW_FORM)get_ULEB128( c_abbv ); |
| 2157 | if (attr == 0 && form == 0) break; |
| 2158 | get_Form_contents( &cts, &ctsSzB, &ctsMemSzB, |
| 2159 | cc, c_die, False/*td3*/, form ); |
| 2160 | if (attr == DW_AT_name && ctsMemSzB > 0) { |
| 2161 | field->name = ML_(addStr)( cc->di, (UChar*)(UWord)cts, -1 ); |
| 2162 | } |
| 2163 | if (attr == DW_AT_type && ctsSzB > 0) { |
| 2164 | field->typeR = (Type*)(UWord)cts; |
| 2165 | } |
| 2166 | if (attr == DW_AT_data_member_location && ctsMemSzB > 0) { |
| 2167 | UChar* copy = ML_(addStr)( cc->di, (UChar*)(UWord)cts, |
| 2168 | (Int)ctsMemSzB ); |
| 2169 | expr = ML_(new_D3Expr)( copy, (UWord)ctsMemSzB ); |
| 2170 | } |
| 2171 | } |
| 2172 | /* Do we have a plausible parent? */ |
| 2173 | if (typestack_is_empty(parser)) goto bad_DIE; |
| 2174 | vg_assert(parser->qparent[parser->sp]); |
| 2175 | if (level != parser->qlevel[parser->sp]+1) goto bad_DIE; |
| 2176 | if (parser->qparent[parser->sp]->tag != Ty_StOrUn) goto bad_DIE; |
| 2177 | /* Do we have something that looks sane? If this a member of a |
| 2178 | struct, we must have a location expression; but if a member |
| 2179 | of a union that is irrelevant (D3 spec sec 5.6.6). We ought |
| 2180 | to reject in the latter case, but some compilers have been |
| 2181 | observed to emit constant-zero expressions. So just ignore |
| 2182 | them. */ |
| 2183 | parent_is_struct |
| 2184 | = parser->qparent[parser->sp]->Ty.StOrUn.isStruct; |
| 2185 | if (!field->name) |
| 2186 | field->name = ML_(addStr)(cc->di, "<anon_field>", -1); |
| 2187 | if ((!field->name) || (field->typeR == D3_INVALID_CUOFF)) |
| 2188 | goto bad_DIE; |
| 2189 | if (parent_is_struct && (!expr)) |
| 2190 | goto bad_DIE; |
| 2191 | if ((!parent_is_struct) && expr) { |
| 2192 | /* If this is a union type, pretend we haven't seen the data |
| 2193 | member location expression, as it is by definition |
| 2194 | redundant (it must be zero). */ |
| 2195 | expr = NULL; |
| 2196 | } |
| 2197 | /* Record this child in the parent */ |
| 2198 | field->isStruct = parent_is_struct; |
| 2199 | if (expr) |
| 2200 | field->loc = expr; |
| 2201 | vg_assert(parser->qparent[parser->sp]->Ty.StOrUn.fields); |
| 2202 | VG_(addToXA)( parser->qparent[parser->sp]->Ty.StOrUn.fields, |
| 2203 | &field ); |
| 2204 | /* And record the child itself */ |
| 2205 | goto acquire_Field_and_Expr; |
| 2206 | } |
| 2207 | |
| 2208 | if (dtag == DW_TAG_array_type) { |
| 2209 | type = ML_(new_Type)(); |
| 2210 | type->tag = Ty_Array; |
| 2211 | type->Ty.Array.typeR = D3_INVALID_CUOFF; |
| 2212 | type->Ty.Array.bounds |
| 2213 | = VG_(newXA)( ML_(dinfo_zalloc), ML_(dinfo_free), |
| 2214 | sizeof(TyBounds*) ); |
| 2215 | while (True) { |
| 2216 | DW_AT attr = (DW_AT) get_ULEB128( c_abbv ); |
| 2217 | DW_FORM form = (DW_FORM)get_ULEB128( c_abbv ); |
| 2218 | if (attr == 0 && form == 0) break; |
| 2219 | get_Form_contents( &cts, &ctsSzB, &ctsMemSzB, |
| 2220 | cc, c_die, False/*td3*/, form ); |
| 2221 | if (attr == DW_AT_type && ctsSzB > 0) { |
| 2222 | type->Ty.Array.typeR = (Type*)(UWord)cts; |
| 2223 | } |
| 2224 | } |
| 2225 | if (type->Ty.Array.typeR == D3_INVALID_CUOFF) |
| 2226 | goto bad_DIE; |
| 2227 | /* On't stack! */ |
| 2228 | typestack_push( cc, parser, td3, type, level ); |
| 2229 | goto acquire_Type; |
| 2230 | } |
| 2231 | |
| 2232 | if (dtag == DW_TAG_subrange_type) { |
| 2233 | Bool have_lower = False; |
| 2234 | Bool have_upper = False; |
| 2235 | Bool have_count = False; |
| 2236 | Long lower = 0; |
| 2237 | Long upper = 0; |
| 2238 | Long count = 0; |
| 2239 | |
| 2240 | switch (parser->language) { |
| 2241 | case 'C': have_lower = True; lower = 0; break; |
| 2242 | case 'F': have_lower = True; lower = 1; break; |
| 2243 | case '?': have_lower = False; break; |
| 2244 | default: vg_assert(0); /* assured us by handling of |
| 2245 | DW_TAG_compile_unit in this fn */ |
| 2246 | } |
| 2247 | bounds = ML_(new_TyBounds)(); |
| 2248 | while (True) { |
| 2249 | DW_AT attr = (DW_AT) get_ULEB128( c_abbv ); |
| 2250 | DW_FORM form = (DW_FORM)get_ULEB128( c_abbv ); |
| 2251 | if (attr == 0 && form == 0) break; |
| 2252 | get_Form_contents( &cts, &ctsSzB, &ctsMemSzB, |
| 2253 | cc, c_die, False/*td3*/, form ); |
| 2254 | if (attr == DW_AT_lower_bound && ctsSzB > 0) { |
| 2255 | lower = (Long)cts; |
| 2256 | have_lower = True; |
| 2257 | } |
| 2258 | if (attr == DW_AT_upper_bound && ctsSzB > 0) { |
| 2259 | upper = (Long)cts; |
| 2260 | have_upper = True; |
| 2261 | } |
| 2262 | if (attr == DW_AT_count && ctsSzB > 0) { |
| 2263 | count = cts; |
| 2264 | have_count = True; |
| 2265 | } |
| 2266 | } |
| 2267 | /* FIXME: potentially skip the rest if no parent present, since |
| 2268 | it could be the case that this subrange type is free-standing |
| 2269 | (not being used to describe the bounds of a containing array |
| 2270 | type) */ |
| 2271 | /* Do we have a plausible parent? */ |
| 2272 | if (typestack_is_empty(parser)) goto bad_DIE; |
| 2273 | vg_assert(parser->qparent[parser->sp]); |
| 2274 | if (level != parser->qlevel[parser->sp]+1) goto bad_DIE; |
| 2275 | if (parser->qparent[parser->sp]->tag != Ty_Array) goto bad_DIE; |
| 2276 | |
| 2277 | /* Figure out if we have a definite range or not */ |
| 2278 | if (have_lower && have_upper && (!have_count)) { |
| 2279 | bounds->knownL = True; |
| 2280 | bounds->knownU = True; |
| 2281 | bounds->boundL = lower; |
| 2282 | bounds->boundU = upper; |
| 2283 | } |
| 2284 | else if (have_lower && (!have_upper) && (!have_count)) { |
| 2285 | bounds->knownL = True; |
| 2286 | bounds->knownU = False; |
| 2287 | bounds->boundL = lower; |
| 2288 | bounds->boundU = 0; |
| 2289 | } else { |
| 2290 | /* FIXME: handle more cases */ |
| 2291 | goto bad_DIE; |
| 2292 | } |
| 2293 | |
| 2294 | /* Record this bound in the parent */ |
| 2295 | vg_assert(parser->qparent[parser->sp]->Ty.Array.bounds); |
| 2296 | VG_(addToXA)( parser->qparent[parser->sp]->Ty.Array.bounds, |
| 2297 | &bounds ); |
| 2298 | /* And record the child itself */ |
| 2299 | goto acquire_Bounds; |
| 2300 | } |
| 2301 | |
| 2302 | if (dtag == DW_TAG_typedef) { |
| 2303 | /* We can pick up a new base type any time. */ |
| 2304 | type = ML_(new_Type)(); |
| 2305 | type->tag = Ty_TyDef; |
| 2306 | type->Ty.TyDef.name = NULL; |
| 2307 | type->Ty.TyDef.typeR = D3_INVALID_CUOFF; |
| 2308 | while (True) { |
| 2309 | DW_AT attr = (DW_AT) get_ULEB128( c_abbv ); |
| 2310 | DW_FORM form = (DW_FORM)get_ULEB128( c_abbv ); |
| 2311 | if (attr == 0 && form == 0) break; |
| 2312 | get_Form_contents( &cts, &ctsSzB, &ctsMemSzB, |
| 2313 | cc, c_die, False/*td3*/, form ); |
| 2314 | if (attr == DW_AT_name && ctsMemSzB > 0) { |
| 2315 | type->Ty.TyDef.name |
| 2316 | = ML_(addStr)( cc->di, (UChar*)(UWord)cts, -1 ); |
| 2317 | } |
| 2318 | if (attr == DW_AT_type && ctsSzB > 0) { |
| 2319 | type->Ty.TyDef.typeR = (Type*)(UWord)cts; |
| 2320 | } |
| 2321 | } |
| 2322 | /* Do we have something that looks sane? */ |
| 2323 | if (/* must have a name */ |
| 2324 | type->Ty.TyDef.name == NULL |
| 2325 | /* but the referred-to type can be absent */) |
| 2326 | goto bad_DIE; |
| 2327 | else |
| 2328 | goto acquire_Type; |
| 2329 | } |
| 2330 | |
| 2331 | if (dtag == DW_TAG_subroutine_type) { |
| 2332 | /* function type? just record that one fact and ask no |
| 2333 | further questions. */ |
| 2334 | type = ML_(new_Type)(); |
| 2335 | type->tag = Ty_Fn; |
| 2336 | goto acquire_Type; |
| 2337 | } |
| 2338 | |
| 2339 | if (dtag == DW_TAG_volatile_type || dtag == DW_TAG_const_type) { |
| 2340 | Int have_ty = 0; |
| 2341 | type = ML_(new_Type)(); |
| 2342 | type->tag = Ty_Qual; |
| 2343 | type->Ty.Qual.qual |
| 2344 | = dtag == DW_TAG_volatile_type ? 'V' : 'C'; |
| 2345 | /* target type defaults to 'void' */ |
| 2346 | type->Ty.Qual.typeR = D3_FAKEVOID_CUOFF; |
| 2347 | while (True) { |
| 2348 | DW_AT attr = (DW_AT) get_ULEB128( c_abbv ); |
| 2349 | DW_FORM form = (DW_FORM)get_ULEB128( c_abbv ); |
| 2350 | if (attr == 0 && form == 0) break; |
| 2351 | get_Form_contents( &cts, &ctsSzB, &ctsMemSzB, |
| 2352 | cc, c_die, False/*td3*/, form ); |
| 2353 | if (attr == DW_AT_type && ctsSzB > 0) { |
| 2354 | type->Ty.Qual.typeR = (Type*)(UWord)cts; |
| 2355 | have_ty++; |
| 2356 | } |
| 2357 | } |
| 2358 | /* gcc sometimes generates DW_TAG_const/volatile_type without |
| 2359 | DW_AT_type and GDB appears to interpret the type as 'const |
| 2360 | void' (resp. 'volatile void'). So just allow it .. */ |
| 2361 | if (have_ty == 1 || have_ty == 0) |
| 2362 | goto acquire_Type; |
| 2363 | else |
| 2364 | goto bad_DIE; |
| 2365 | } |
| 2366 | |
| 2367 | /* else ignore this DIE */ |
| 2368 | return; |
| 2369 | /*NOTREACHED*/ |
| 2370 | |
| 2371 | acquire_Type: |
| 2372 | if (0) VG_(printf)("YYYY Acquire Type\n"); |
| 2373 | vg_assert(type); vg_assert(!atom); vg_assert(!field); |
| 2374 | vg_assert(!expr); vg_assert(!bounds); |
| 2375 | *admin = ML_(new_TyAdmin)( posn, *admin ); |
| 2376 | (*admin)->payload = type; |
| 2377 | (*admin)->tag = TyA_Type; |
| 2378 | return; |
| 2379 | /*NOTREACHED*/ |
| 2380 | |
| 2381 | acquire_Atom: |
| 2382 | if (0) VG_(printf)("YYYY Acquire Atom\n"); |
| 2383 | vg_assert(!type); vg_assert(atom); vg_assert(!field); |
| 2384 | vg_assert(!expr); vg_assert(!bounds); |
| 2385 | *admin = ML_(new_TyAdmin)( posn, *admin ); |
| 2386 | (*admin)->payload = atom; |
| 2387 | (*admin)->tag = TyA_Atom; |
| 2388 | return; |
| 2389 | /*NOTREACHED*/ |
| 2390 | |
| 2391 | acquire_Field_and_Expr: |
| 2392 | /* For union members, Expr should be absent */ |
| 2393 | if (0) VG_(printf)("YYYY Acquire Field and Expr\n"); |
| 2394 | vg_assert(!type); vg_assert(!atom); vg_assert(field); |
| 2395 | /*vg_assert(expr);*/ vg_assert(!bounds); |
| 2396 | if (expr) { |
| 2397 | *admin = ML_(new_TyAdmin)( (UWord)D3_INVALID_CUOFF, |
| 2398 | *admin ); |
| 2399 | (*admin)->payload = expr; |
| 2400 | (*admin)->tag = TyA_Expr; |
| 2401 | } |
| 2402 | *admin = ML_(new_TyAdmin)( posn, *admin ); |
| 2403 | (*admin)->payload = field; |
| 2404 | (*admin)->tag = TyA_Field; |
| 2405 | return; |
| 2406 | /*NOTREACHED*/ |
| 2407 | |
| 2408 | acquire_Bounds: |
| 2409 | if (0) VG_(printf)("YYYY Acquire Bounds\n"); |
| 2410 | vg_assert(!type); vg_assert(!atom); vg_assert(!field); |
| 2411 | vg_assert(!expr); vg_assert(bounds); |
| 2412 | *admin = ML_(new_TyAdmin)( posn, *admin ); |
| 2413 | (*admin)->payload = bounds; |
| 2414 | (*admin)->tag = TyA_Bounds; |
| 2415 | return; |
| 2416 | /*NOTREACHED*/ |
| 2417 | |
| 2418 | bad_DIE: |
| 2419 | set_position_of_Cursor( c_die, saved_die_c_offset ); |
| 2420 | set_position_of_Cursor( c_abbv, saved_abbv_c_offset ); |
| 2421 | VG_(printf)("\nparse_type_DIE: confused by:\n"); |
| 2422 | VG_(printf)(" <%d><%lx>: %s\n", level, posn, ML_(pp_DW_TAG)( dtag ) ); |
| 2423 | while (True) { |
| 2424 | DW_AT attr = (DW_AT) get_ULEB128( c_abbv ); |
| 2425 | DW_FORM form = (DW_FORM)get_ULEB128( c_abbv ); |
| 2426 | if (attr == 0 && form == 0) break; |
| 2427 | VG_(printf)(" %18s: ", ML_(pp_DW_AT)(attr)); |
| 2428 | /* Get the form contents, so as to print them */ |
| 2429 | get_Form_contents( &cts, &ctsSzB, &ctsMemSzB, |
| 2430 | cc, c_die, True, form ); |
| 2431 | VG_(printf)("\t\n"); |
| 2432 | } |
| 2433 | VG_(printf)("\n"); |
| 2434 | cc->barf("parse_type_DIE: confused by the above DIE"); |
| 2435 | /*NOTREACHED*/ |
| 2436 | } |
| 2437 | |
| 2438 | |
| 2439 | /*------------------------------------------------------------*/ |
| 2440 | /*--- ---*/ |
| 2441 | /*--- Resolution of references to type DIEs ---*/ |
| 2442 | /*--- ---*/ |
| 2443 | /*------------------------------------------------------------*/ |
| 2444 | |
| 2445 | static Int cmp_D3TyAdmin_by_cuOff ( void* v1, void* v2 ) { |
| 2446 | TyAdmin* a1 = *(TyAdmin**)v1; |
| 2447 | TyAdmin* a2 = *(TyAdmin**)v2; |
| 2448 | if (a1->cuOff < a2->cuOff) return -1; |
| 2449 | if (a1->cuOff > a2->cuOff) return 1; |
| 2450 | return 0; |
| 2451 | } |
| 2452 | |
| 2453 | /* Look up 'cuOff' in 'map', to find the associated D3TyAdmin*. Check |
| 2454 | that the found D3TyAdmin has tag 'adtag'. Sets *payload to be the |
| 2455 | resulting payload pointer and returns True on success. |
| 2456 | |
| 2457 | Also, if 'allow_invalid' is True, then if cuOff is |
| 2458 | D3_INVALID_CUOFF, return NULL in *payload. |
| 2459 | |
| 2460 | Otherwise (conceptually fails) and returns False. */ |
| 2461 | __attribute__((noinline)) |
| 2462 | static Bool resolve_binding ( /*OUT*/void** payload, |
| 2463 | XArray* map, void* cuOff, |
| 2464 | TyAdminTag tag, |
| 2465 | Bool allow_invalid ) { |
| 2466 | Bool found; |
| 2467 | Word ixLo, ixHi; |
| 2468 | TyAdmin dummy, *dummyP, *admin; |
| 2469 | |
| 2470 | if (cuOff == D3_INVALID_CUOFF && allow_invalid) { |
| 2471 | *payload = NULL; |
| 2472 | return True; |
| 2473 | } |
| 2474 | |
| 2475 | VG_(memset)(&dummy, 0, sizeof(dummy)); |
| 2476 | dummy.cuOff = (UWord)cuOff; |
| 2477 | dummyP = &dummy; |
| 2478 | found = VG_(lookupXA)( map, &dummyP, &ixLo, &ixHi ); |
| 2479 | if (!found) |
| 2480 | return False; |
| 2481 | /* If this doesn't hold, we must have seen more than one DIE with |
| 2482 | the same cuOff(set). Which isn't possible. */ |
| 2483 | vg_assert(ixLo == ixHi); |
| 2484 | admin = *(TyAdmin**)VG_(indexXA)( map, ixLo ); |
| 2485 | /* All payload pointers should be non-NULL. Ensured by assertion in |
| 2486 | loop in resolve_type_entities that creates 'map'. Hence it is |
| 2487 | safe to return NULL to indicate 'not found'. */ |
| 2488 | vg_assert(admin->payload); |
| 2489 | vg_assert(admin->cuOff == (UWord)cuOff); /* stay sane */ |
| 2490 | |
| 2491 | if (admin->tag != tag) |
| 2492 | return False; |
| 2493 | |
| 2494 | *payload = admin->payload; |
| 2495 | return True; |
| 2496 | } |
| 2497 | |
| 2498 | __attribute__((noinline)) |
| 2499 | static void resolve_type_entities ( /*MOD*/TyAdmin* admin, |
| 2500 | /*MOD*/TempVar* vars ) |
| 2501 | { |
| 2502 | Bool ok; |
| 2503 | void* payload; |
| 2504 | TyAdmin* adp; |
| 2505 | XArray* /* of D3TyAdmin* */ map; |
| 2506 | |
| 2507 | map = VG_(newXA)( ML_(dinfo_zalloc), ML_(dinfo_free), |
| 2508 | sizeof(TyAdmin*) ); |
| 2509 | for (adp = admin; adp; adp = adp->next) { |
| 2510 | vg_assert(adp); |
| 2511 | vg_assert(adp->payload != NULL); |
| 2512 | if (adp->cuOff != (UWord)D3_INVALID_CUOFF) { |
| 2513 | VG_(addToXA)( map, &adp ); |
| 2514 | } |
| 2515 | } |
| 2516 | |
| 2517 | VG_(setCmpFnXA)( map, cmp_D3TyAdmin_by_cuOff ); |
| 2518 | if (0) |
| 2519 | VG_(printf)("XXXXXX sorting map with %d entries\n", |
| 2520 | (Int)VG_(sizeXA)(map)); |
| 2521 | VG_(sortXA)( map ); |
| 2522 | |
| 2523 | for (adp = admin; adp; adp = adp->next) { |
| 2524 | vg_assert(adp->payload); |
| 2525 | switch (adp->tag) { |
| 2526 | case TyA_Bounds: { |
| 2527 | TyBounds* bounds = (TyBounds*)adp->payload; |
| 2528 | if (bounds->knownL && bounds->knownU |
| 2529 | && bounds->knownL > bounds->knownU) goto baaad; |
| 2530 | break; |
| 2531 | } |
| 2532 | case TyA_Atom: { |
| 2533 | TyAtom* atom = (TyAtom*)adp->payload; |
| 2534 | if (!atom->name) goto baaad; |
| 2535 | break; |
| 2536 | } |
| 2537 | case TyA_Expr: { |
| 2538 | D3Expr* expr = (D3Expr*)adp->payload; |
| 2539 | if (!expr->bytes) goto baaad; |
| 2540 | break; |
| 2541 | } |
| 2542 | case TyA_Field: { |
| 2543 | TyField* field = (TyField*)adp->payload; |
| 2544 | if (!field->name) goto baaad; |
| 2545 | if ( (field->isStruct && (!field->loc)) |
| 2546 | || ((!field->isStruct) && field->loc)) |
| 2547 | goto baaad; |
| 2548 | ok = resolve_binding( &payload, map, field->typeR, |
| 2549 | TyA_Type, False/*!allow_invalid*/ ); |
| 2550 | if (!ok) goto baaad; |
| 2551 | field->typeR = payload; |
| 2552 | break; |
| 2553 | } |
| 2554 | case TyA_Type: { |
| 2555 | UChar enc; |
| 2556 | XArray* xa; |
| 2557 | Type* ty = (Type*)adp->payload; |
| 2558 | switch (ty->tag) { |
| 2559 | case Ty_Base: |
| 2560 | enc = ty->Ty.Base.enc; |
| 2561 | if ((!ty->Ty.Base.name) |
| 2562 | || ty->Ty.Base.szB < 1 || ty->Ty.Base.szB > 32 |
| 2563 | || (enc != 'S' && enc != 'U' && enc != 'F' && enc != 'C')) |
| 2564 | goto baaad; |
| 2565 | break; |
| 2566 | case Ty_TyDef: |
| 2567 | if (!ty->Ty.TyDef.name) goto baaad; |
| 2568 | ok = resolve_binding( &payload, map, |
| 2569 | ty->Ty.TyDef.typeR, |
| 2570 | TyA_Type, |
| 2571 | True/*allow_invalid*/ ); |
| 2572 | if (!ok) goto baaad; |
| 2573 | ty->Ty.TyDef.typeR = payload; |
| 2574 | break; |
| 2575 | case Ty_PorR: |
| 2576 | if (ty->Ty.PorR.szB != sizeof(Word)) goto baaad; |
| 2577 | ok = resolve_binding( &payload, map, |
| 2578 | ty->Ty.PorR.typeR, |
| 2579 | TyA_Type, |
| 2580 | False/*!allow_invalid*/ ); |
| 2581 | if (!ok) goto baaad; |
| 2582 | ty->Ty.PorR.typeR = payload; |
| 2583 | break; |
| 2584 | case Ty_Array: |
| 2585 | if (!ty->Ty.Array.bounds) goto baaad; |
| 2586 | ok = resolve_binding( &payload, map, |
| 2587 | ty->Ty.Array.typeR, |
| 2588 | TyA_Type, |
| 2589 | False/*!allow_invalid*/ ); |
| 2590 | if (!ok) goto baaad; |
| 2591 | ty->Ty.Array.typeR = payload; |
| 2592 | break; |
| 2593 | case Ty_Enum: |
| 2594 | if ((!ty->Ty.Enum.atomRs) |
| 2595 | || ty->Ty.Enum.szB < 1 |
| 2596 | || ty->Ty.Enum.szB > 8) goto baaad; |
| 2597 | xa = ty->Ty.Enum.atomRs; |
| 2598 | break; |
| 2599 | case Ty_StOrUn: |
| 2600 | xa = ty->Ty.StOrUn.fields; |
| 2601 | if (!xa) goto baaad; |
| 2602 | break; |
| 2603 | case Ty_Fn: |
| 2604 | break; |
| 2605 | case Ty_Qual: |
| 2606 | if (ty->Ty.Qual.qual != 'C' |
| 2607 | && ty->Ty.Qual.qual != 'V') goto baaad; |
| 2608 | ok = resolve_binding( &payload, map, |
| 2609 | ty->Ty.Qual.typeR, |
| 2610 | TyA_Type, |
| 2611 | False/*!allow_invalid*/ ); |
| 2612 | if (!ok) goto baaad; |
| 2613 | ty->Ty.Qual.typeR = payload; |
| 2614 | break; |
| 2615 | case Ty_Void: |
| 2616 | if (ty->Ty.Void.isFake != False |
| 2617 | && ty->Ty.Void.isFake != True) goto baaad; |
| 2618 | break; |
| 2619 | default: |
| 2620 | goto baaad; |
| 2621 | } |
| 2622 | break; |
| 2623 | } |
| 2624 | baaad: |
| 2625 | default: |
| 2626 | VG_(printf)("valgrind: bad D3TyAdmin: "); |
| 2627 | ML_(pp_TyAdmin)(adp); |
| 2628 | VG_(printf)("\n"); |
| 2629 | } |
| 2630 | } |
| 2631 | |
| 2632 | /* Now resolve the variables list */ |
| 2633 | for (; vars; vars = vars->next) { |
| 2634 | payload = NULL; |
| 2635 | ok = resolve_binding( &payload, map, vars->typeR, |
| 2636 | TyA_Type, True/*allow_invalid*/ ); |
| 2637 | |
| 2638 | if (0 && !ok) |
| 2639 | VG_(printf)("Can't resolve type reference 0x%lx\n", |
| 2640 | (UWord)vars->typeR); |
| 2641 | //vg_assert(ok); |
| 2642 | vars->typeR = payload; |
| 2643 | } |
| 2644 | |
| 2645 | VG_(deleteXA)( map ); |
| 2646 | } |
| 2647 | |
| 2648 | |
| 2649 | /*------------------------------------------------------------*/ |
| 2650 | /*--- ---*/ |
| 2651 | /*--- Parsing of Compilation Units ---*/ |
| 2652 | /*--- ---*/ |
| 2653 | /*------------------------------------------------------------*/ |
| 2654 | |
| 2655 | static Int cmp_TempVar_by_dioff ( void* v1, void* v2 ) { |
| 2656 | TempVar* t1 = *(TempVar**)v1; |
| 2657 | TempVar* t2 = *(TempVar**)v2; |
| 2658 | if (t1->dioff < t2->dioff) return -1; |
| 2659 | if (t1->dioff > t2->dioff) return 1; |
| 2660 | return 0; |
| 2661 | } |
| 2662 | |
| 2663 | static void read_DIE ( /*OUT*/TyAdmin** admin, |
| 2664 | /*OUT*/TempVar** tempvars, |
| 2665 | /*OUT*/GExpr** gexprs, |
| 2666 | /*MOD*/D3TypeParser* typarser, |
| 2667 | /*MOD*/D3VarParser* varparser, |
| 2668 | Cursor* c, Bool td3, CUConst* cc, Int level ) |
| 2669 | { |
| 2670 | Cursor abbv; |
| 2671 | ULong atag, abbv_code; |
| 2672 | UWord posn; |
| 2673 | UInt has_children; |
| 2674 | UWord start_die_c_offset, start_abbv_c_offset; |
| 2675 | UWord after_die_c_offset, after_abbv_c_offset; |
| 2676 | |
| 2677 | /* --- Deal with this DIE --- */ |
| 2678 | posn = get_position_of_Cursor( c ); |
| 2679 | abbv_code = get_ULEB128( c ); |
| 2680 | set_abbv_Cursor( &abbv, td3, cc, abbv_code ); |
| 2681 | atag = get_ULEB128( &abbv ); |
| 2682 | TRACE_D3("\n"); |
| 2683 | TRACE_D3(" <%d><%lx>: Abbrev Number: %llu (%s)\n", |
| 2684 | level, posn, abbv_code, ML_(pp_DW_TAG)( atag ) ); |
| 2685 | |
| 2686 | if (atag == 0) |
| 2687 | cc->barf("read_DIE: invalid zero tag on DIE"); |
| 2688 | |
| 2689 | has_children = get_UChar( &abbv ); |
| 2690 | if (has_children != DW_children_no && has_children != DW_children_yes) |
| 2691 | cc->barf("read_DIE: invalid has_children value"); |
| 2692 | |
| 2693 | /* We're set up to look at the fields of this DIE. Hand it off to |
| 2694 | any parser(s) that want to see it. Since they will in general |
| 2695 | advance both the DIE and abbrev cursors, remember their current |
| 2696 | settings so that we can then back up and do one final pass over |
| 2697 | the DIE, to print out its contents. */ |
| 2698 | |
| 2699 | start_die_c_offset = get_position_of_Cursor( c ); |
| 2700 | start_abbv_c_offset = get_position_of_Cursor( &abbv ); |
| 2701 | |
| 2702 | while (True) { |
| 2703 | ULong cts; |
| 2704 | Int ctsSzB; |
| 2705 | UWord ctsMemSzB; |
| 2706 | ULong at_name = get_ULEB128( &abbv ); |
| 2707 | ULong at_form = get_ULEB128( &abbv ); |
| 2708 | if (at_name == 0 && at_form == 0) break; |
| 2709 | TRACE_D3(" %18s: ", ML_(pp_DW_AT)(at_name)); |
| 2710 | /* Get the form contents, but ignore them; the only purpose is |
| 2711 | to print them, if td3 is True */ |
| 2712 | get_Form_contents( &cts, &ctsSzB, &ctsMemSzB, |
| 2713 | cc, c, td3, (DW_FORM)at_form ); |
| 2714 | TRACE_D3("\t"); |
| 2715 | TRACE_D3("\n"); |
| 2716 | } |
| 2717 | |
| 2718 | after_die_c_offset = get_position_of_Cursor( c ); |
| 2719 | after_abbv_c_offset = get_position_of_Cursor( &abbv ); |
| 2720 | |
| 2721 | set_position_of_Cursor( c, start_die_c_offset ); |
| 2722 | set_position_of_Cursor( &abbv, start_abbv_c_offset ); |
| 2723 | |
| 2724 | parse_type_DIE( admin, |
| 2725 | typarser, |
| 2726 | (DW_TAG)atag, |
| 2727 | posn, |
| 2728 | level, |
| 2729 | c, /* DIE cursor */ |
| 2730 | &abbv, /* abbrev cursor */ |
| 2731 | cc, |
| 2732 | td3 ); |
| 2733 | |
| 2734 | set_position_of_Cursor( c, start_die_c_offset ); |
| 2735 | set_position_of_Cursor( &abbv, start_abbv_c_offset ); |
| 2736 | |
| 2737 | parse_var_DIE( tempvars, |
| 2738 | gexprs, |
| 2739 | varparser, |
| 2740 | (DW_TAG)atag, |
| 2741 | posn, |
| 2742 | level, |
| 2743 | c, /* DIE cursor */ |
| 2744 | &abbv, /* abbrev cursor */ |
| 2745 | cc, |
| 2746 | td3 ); |
| 2747 | |
| 2748 | set_position_of_Cursor( c, after_die_c_offset ); |
| 2749 | set_position_of_Cursor( &abbv, after_abbv_c_offset ); |
| 2750 | |
| 2751 | /* --- Now recurse into its children, if any --- */ |
| 2752 | if (has_children == DW_children_yes) { |
| 2753 | if (0) TRACE_D3("BEGIN children of level %d\n", level); |
| 2754 | while (True) { |
| 2755 | atag = peek_ULEB128( c ); |
| 2756 | if (atag == 0) break; |
| 2757 | read_DIE( admin, tempvars, gexprs, typarser, varparser, |
| 2758 | c, td3, cc, level+1 ); |
| 2759 | } |
| 2760 | /* Now we need to eat the terminating zero */ |
| 2761 | atag = get_ULEB128( c ); |
| 2762 | vg_assert(atag == 0); |
| 2763 | if (0) TRACE_D3("END children of level %d\n", level); |
| 2764 | } |
| 2765 | |
| 2766 | } |
| 2767 | |
| 2768 | |
| 2769 | static |
| 2770 | void new_dwarf3_reader_wrk ( |
| 2771 | struct _DebugInfo* di, |
| 2772 | __attribute__((noreturn)) |
| 2773 | void (*barf)( HChar* ), |
| 2774 | UChar* debug_info_img, SizeT debug_info_sz, |
| 2775 | UChar* debug_abbv_img, SizeT debug_abbv_sz, |
| 2776 | UChar* debug_line_img, SizeT debug_line_sz, |
| 2777 | UChar* debug_str_img, SizeT debug_str_sz, |
| 2778 | UChar* debug_ranges_img, SizeT debug_ranges_sz, |
| 2779 | UChar* debug_loc_img, SizeT debug_loc_sz |
| 2780 | ) |
| 2781 | { |
| 2782 | TyAdmin *admin, *adminp; |
| 2783 | TempVar *tempvars, *varp, *varp2; |
| 2784 | GExpr *gexprs, *gexpr; |
| 2785 | Cursor abbv; /* for showing .debug_abbrev */ |
| 2786 | Cursor info; /* primary cursor for parsing .debug_info */ |
| 2787 | Cursor ranges; /* for showing .debug_ranges */ |
| 2788 | D3TypeParser typarser; |
| 2789 | D3VarParser varparser; |
| 2790 | Addr dr_base; |
| 2791 | UWord dr_offset; |
| 2792 | Word i; |
| 2793 | Bool td3 = di->trace_symtab; |
| 2794 | XArray* /* of TempVar* */ dioff_lookup_tab; |
| 2795 | |
| 2796 | #if 0 |
| 2797 | /* This doesn't work properly because it assumes all entries are |
| 2798 | packed end to end, with no holes. But that doesn't always |
| 2799 | appear to be the case, so it loses sync. And the D3 spec |
| 2800 | doesn't appear to require a no-hole situation either. */ |
| 2801 | /* Display .debug_loc */ |
| 2802 | Addr dl_base; |
| 2803 | UWord dl_offset; |
| 2804 | Cursor loc; /* for showing .debug_loc */ |
| 2805 | TRACE_SYMTAB("\n"); |
| 2806 | TRACE_SYMTAB("\n------ The contents of .debug_loc ------\n"); |
| 2807 | TRACE_SYMTAB(" Offset Begin End Expression\n"); |
| 2808 | init_Cursor( &loc, debug_loc_img, |
| 2809 | debug_loc_sz, 0, barf, |
| 2810 | "Overrun whilst reading .debug_loc section(1)" ); |
| 2811 | dl_base = 0; |
| 2812 | dl_offset = 0; |
| 2813 | while (True) { |
| 2814 | UWord w1, w2; |
| 2815 | UWord len; |
| 2816 | if (is_at_end_Cursor( &loc )) |
| 2817 | break; |
| 2818 | |
| 2819 | /* Read a (host-)word pair. This is something of a hack since |
| 2820 | the word size to read is really dictated by the ELF file; |
| 2821 | however, we assume we're reading a file with the same |
| 2822 | word-sizeness as the host. Reasonably enough. */ |
| 2823 | w1 = get_UWord( &loc ); |
| 2824 | w2 = get_UWord( &loc ); |
| 2825 | |
| 2826 | if (w1 == 0 && w2 == 0) { |
| 2827 | /* end of list. reset 'base' */ |
| 2828 | TRACE_D3(" %08lx <End of list>\n", dl_offset); |
| 2829 | dl_base = 0; |
| 2830 | dl_offset = get_position_of_Cursor( &loc ); |
| 2831 | continue; |
| 2832 | } |
| 2833 | |
| 2834 | if (w1 == -1UL) { |
| 2835 | /* new value for 'base' */ |
| 2836 | TRACE_D3(" %08lx %16lx %08lx (base address)\n", |
| 2837 | dl_offset, w1, w2); |
| 2838 | dl_base = w2; |
| 2839 | continue; |
| 2840 | } |
| 2841 | |
| 2842 | /* else a location expression follows */ |
| 2843 | TRACE_D3(" %08lx %08lx %08lx ", |
| 2844 | dl_offset, w1 + dl_base, w2 + dl_base); |
| 2845 | len = (UWord)get_UShort( &loc ); |
| 2846 | while (len > 0) { |
| 2847 | UChar byte = get_UChar( &loc ); |
| 2848 | TRACE_D3("%02x", (UInt)byte); |
| 2849 | len--; |
| 2850 | } |
| 2851 | TRACE_SYMTAB("\n"); |
| 2852 | } |
| 2853 | #endif |
| 2854 | |
| 2855 | /* Display .debug_ranges */ |
| 2856 | TRACE_SYMTAB("\n"); |
| 2857 | TRACE_SYMTAB("\n------ The contents of .debug_ranges ------\n"); |
| 2858 | TRACE_SYMTAB(" Offset Begin End\n"); |
| 2859 | init_Cursor( &ranges, debug_ranges_img, |
| 2860 | debug_ranges_sz, 0, barf, |
| 2861 | "Overrun whilst reading .debug_ranges section(1)" ); |
| 2862 | dr_base = 0; |
| 2863 | dr_offset = 0; |
| 2864 | while (True) { |
| 2865 | UWord w1, w2; |
| 2866 | |
| 2867 | if (is_at_end_Cursor( &ranges )) |
| 2868 | break; |
| 2869 | |
| 2870 | /* Read a (host-)word pair. This is something of a hack since |
| 2871 | the word size to read is really dictated by the ELF file; |
| 2872 | however, we assume we're reading a file with the same |
| 2873 | word-sizeness as the host. Reasonably enough. */ |
| 2874 | w1 = get_UWord( &ranges ); |
| 2875 | w2 = get_UWord( &ranges ); |
| 2876 | |
| 2877 | if (w1 == 0 && w2 == 0) { |
| 2878 | /* end of list. reset 'base' */ |
| 2879 | TRACE_D3(" %08lx <End of list>\n", dr_offset); |
| 2880 | dr_base = 0; |
| 2881 | dr_offset = get_position_of_Cursor( &ranges ); |
| 2882 | continue; |
| 2883 | } |
| 2884 | |
| 2885 | if (w1 == -1UL) { |
| 2886 | /* new value for 'base' */ |
| 2887 | TRACE_D3(" %08lx %16lx %08lx (base address)\n", |
| 2888 | dr_offset, w1, w2); |
| 2889 | dr_base = w2; |
| 2890 | continue; |
| 2891 | } |
| 2892 | |
| 2893 | /* else a range [w1+base, w2+base) is denoted */ |
| 2894 | TRACE_D3(" %08lx %08lx %08lx\n", |
| 2895 | dr_offset, w1 + dr_base, w2 + dr_base); |
| 2896 | } |
| 2897 | |
| 2898 | |
| 2899 | /* Display .debug_abbrev */ |
| 2900 | init_Cursor( &abbv, debug_abbv_img, debug_abbv_sz, 0, barf, |
| 2901 | "Overrun whilst reading .debug_abbrev section" ); |
| 2902 | TRACE_SYMTAB("\n"); |
| 2903 | TRACE_SYMTAB("\n------ The contents of .debug_abbrev ------\n"); |
| 2904 | while (True) { |
| 2905 | if (is_at_end_Cursor( &abbv )) |
| 2906 | break; |
| 2907 | /* Read one abbreviation table */ |
| 2908 | TRACE_D3(" Number TAG\n"); |
| 2909 | while (True) { |
| 2910 | ULong atag; |
| 2911 | UInt has_children; |
| 2912 | ULong acode = get_ULEB128( &abbv ); |
| 2913 | if (acode == 0) break; /* end of the table */ |
| 2914 | atag = get_ULEB128( &abbv ); |
| 2915 | has_children = get_UChar( &abbv ); |
| 2916 | TRACE_D3(" %llu %s [%s]\n", |
| 2917 | acode, ML_(pp_DW_TAG)(atag), |
| 2918 | ML_(pp_DW_children)(has_children)); |
| 2919 | while (True) { |
| 2920 | ULong at_name = get_ULEB128( &abbv ); |
| 2921 | ULong at_form = get_ULEB128( &abbv ); |
| 2922 | if (at_name == 0 && at_form == 0) break; |
| 2923 | TRACE_D3(" %18s %s\n", |
| 2924 | ML_(pp_DW_AT)(at_name), ML_(pp_DW_FORM)(at_form)); |
| 2925 | } |
| 2926 | } |
| 2927 | } |
| 2928 | TRACE_SYMTAB("\n"); |
| 2929 | |
| 2930 | /* Now loop over the Compilation Units listed in the .debug_info |
| 2931 | section (see D3SPEC sec 7.5) paras 1 and 2. Each compilation |
| 2932 | unit contains a Compilation Unit Header followed by precisely |
| 2933 | one DW_TAG_compile_unit or DW_TAG_partial_unit DIE. */ |
| 2934 | init_Cursor( &info, debug_info_img, debug_info_sz, 0, barf, |
| 2935 | "Overrun whilst reading .debug_info section" ); |
| 2936 | |
| 2937 | /* We'll park the harvested type information in here. Also create |
| 2938 | a fake "void" entry with offset D3_FAKEVOID_CUOFF, so we always |
| 2939 | have at least one type entry to refer to. D3_FAKEVOID_CUOFF is |
| 2940 | huge and presumably will not occur in any valid DWARF3 file -- |
| 2941 | it would need to have a .debug_info section 4GB long for that to |
| 2942 | happen. These type entries end up in the DebugInfo. */ |
| 2943 | admin = NULL; |
| 2944 | { Type* tVoid = ML_(new_Type)(); |
| 2945 | tVoid->tag = Ty_Void; |
| 2946 | tVoid->Ty.Void.isFake = True; |
| 2947 | admin = ML_(new_TyAdmin)( (UWord)D3_FAKEVOID_CUOFF, admin ); |
| 2948 | admin->payload = tVoid; |
| 2949 | admin->tag = TyA_Type; |
| 2950 | } |
| 2951 | |
| 2952 | /* List of variables we're accumulating. These don't end up in the |
| 2953 | DebugInfo; instead their contents are handed to ML_(addVar) and |
| 2954 | the list elements are then deleted. */ |
| 2955 | tempvars = NULL; |
| 2956 | |
| 2957 | /* List of GExprs we're accumulating. These wind up in the |
| 2958 | DebugInfo. */ |
| 2959 | gexprs = NULL; |
| 2960 | |
| 2961 | /* We need a D3TypeParser to keep track of partially constructed |
| 2962 | types. It'll be discarded as soon as we've completed the CU, |
| 2963 | since the resulting information is tipped in to 'admin' as it is |
| 2964 | generated. */ |
| 2965 | VG_(memset)( &typarser, 0, sizeof(typarser) ); |
| 2966 | typarser.sp = -1; |
| 2967 | typarser.language = '?'; |
| 2968 | |
| 2969 | VG_(memset)( &varparser, 0, sizeof(varparser) ); |
| 2970 | varparser.sp = -1; |
| 2971 | |
| 2972 | TRACE_D3("\n------ Parsing .debug_info section ------\n"); |
| 2973 | while (True) { |
| 2974 | UWord cu_start_offset, cu_offset_now; |
| 2975 | CUConst cc; |
| 2976 | |
| 2977 | /* It seems icc9 finishes the DIE info before debug_info_sz |
| 2978 | bytes have been used up. So be flexible, and declare the |
| 2979 | sequence complete if there is not enough remaining bytes to |
| 2980 | hold even the smallest conceivable CU header. (11 bytes I |
| 2981 | reckon). */ |
| 2982 | Word avail = get_remaining_length_Cursor( &info ); |
| 2983 | if (avail < 11) { |
| 2984 | if (avail > 0) |
| 2985 | TRACE_D3("new_dwarf3_reader_wrk: warning: " |
| 2986 | "%ld unused bytes after end of DIEs\n", avail); |
| 2987 | break; |
| 2988 | } |
| 2989 | |
| 2990 | /* Check the varparser's stack is in a sane state. */ |
| 2991 | vg_assert(varparser.sp == -1); |
| 2992 | for (i = 0; i < N_D3_VAR_STACK; i++) { |
| 2993 | vg_assert(varparser.ranges[i] == NULL); |
| 2994 | vg_assert(varparser.level[i] == 0); |
| 2995 | } |
| 2996 | for (i = 0; i < N_D3_TYPE_STACK; i++) { |
| 2997 | vg_assert(typarser.qparent[i] == NULL); |
| 2998 | vg_assert(typarser.qlevel[i] == 0); |
| 2999 | } |
| 3000 | |
| 3001 | cu_start_offset = get_position_of_Cursor( &info ); |
| 3002 | TRACE_D3("\n"); |
| 3003 | TRACE_D3(" Compilation Unit @ offset 0x%lx:\n", cu_start_offset); |
| 3004 | /* parse_CU_header initialises the CU's set_abbv_Cursor cache |
| 3005 | (saC_cache) */ |
| 3006 | parse_CU_Header( &cc, td3, &info, |
| 3007 | (UChar*)debug_abbv_img, debug_abbv_sz ); |
| 3008 | cc.debug_str_img = debug_str_img; |
| 3009 | cc.debug_str_sz = debug_str_sz; |
| 3010 | cc.debug_ranges_img = debug_ranges_img; |
| 3011 | cc.debug_ranges_sz = debug_ranges_sz; |
| 3012 | cc.debug_loc_img = debug_loc_img; |
| 3013 | cc.debug_loc_sz = debug_loc_sz; |
| 3014 | cc.debug_line_img = debug_line_img; |
| 3015 | cc.debug_line_sz = debug_line_sz; |
| 3016 | cc.cu_start_offset = cu_start_offset; |
| 3017 | cc.di = di; |
| 3018 | /* The CU's svma can be deduced by looking at the AT_low_pc |
| 3019 | value in the top level TAG_compile_unit, which is the topmost |
| 3020 | DIE. We'll leave it for the 'varparser' to acquire that info |
| 3021 | and fill it in -- since it is the only party to want to know |
| 3022 | it. */ |
| 3023 | cc.cu_svma_known = False; |
| 3024 | cc.cu_svma = 0; |
| 3025 | |
| 3026 | /* Create a fake outermost-level range covering the entire |
| 3027 | address range. So we always have *something* to catch all |
| 3028 | variable declarations. */ |
| 3029 | varstack_push( &cc, &varparser, td3, |
| 3030 | unitary_range_list(0UL, ~0UL), |
| 3031 | -1, False/*isFunc*/, NULL/*fbGX*/ ); |
| 3032 | |
| 3033 | /* And set up the file name table. When we come across the top |
| 3034 | level DIE for this CU (which is what the next call to |
| 3035 | read_DIE should process) we will copy all the file names out |
| 3036 | of the .debug_line img area and use this table to look up the |
| 3037 | copies when we later see filename numbers in DW_TAG_variables |
| 3038 | etc. */ |
| 3039 | vg_assert(!varparser.filenameTable ); |
| 3040 | varparser.filenameTable |
| 3041 | = VG_(newXA)( ML_(dinfo_zalloc), ML_(dinfo_free), |
| 3042 | sizeof(UChar*) ); |
| 3043 | vg_assert(varparser.filenameTable ); |
| 3044 | |
| 3045 | /* Now read the one-and-only top-level DIE for this CU. */ |
| 3046 | vg_assert(varparser.sp == 0); |
| 3047 | read_DIE( &admin, &tempvars, &gexprs, &typarser, &varparser, |
| 3048 | &info, td3, &cc, 0 ); |
| 3049 | |
| 3050 | cu_offset_now = get_position_of_Cursor( &info ); |
| 3051 | if (1) TRACE_D3("offset now %ld, d-i-size %ld\n", |
| 3052 | cu_offset_now, debug_info_sz); |
| 3053 | if (cu_offset_now > debug_info_sz) |
| 3054 | barf("toplevel DIEs beyond end of CU"); |
| 3055 | if (cu_offset_now == debug_info_sz) |
| 3056 | break; |
| 3057 | |
| 3058 | /* Preen to level -2. DIEs have level >= 0 so -2 cannot occur |
| 3059 | anywhere else at all. Our fake the-entire-address-space |
| 3060 | range is at level -1, so preening to -2 should completely |
| 3061 | empty the stack out. */ |
| 3062 | TRACE_D3("\n"); |
| 3063 | varstack_preen( &varparser, td3, -2 ); |
| 3064 | /* Similarly, empty the type stack out. */ |
| 3065 | typestack_preen( &typarser, td3, -2 ); |
| 3066 | /* else keep going */ |
| 3067 | |
| 3068 | TRACE_D3("set_abbv_Cursor cache: %lu queries, %lu misses\n", |
| 3069 | cc.saC_cache_queries, cc.saC_cache_misses); |
| 3070 | |
| 3071 | vg_assert(varparser.filenameTable ); |
| 3072 | VG_(deleteXA)( varparser.filenameTable ); |
| 3073 | varparser.filenameTable = NULL; |
| 3074 | } |
| 3075 | |
| 3076 | /* Put the type entry list the right way round. Not strictly |
| 3077 | necessary, but makes it easier to read. */ |
| 3078 | vg_assert(admin); |
| 3079 | if (admin) { |
| 3080 | TyAdmin *next, *prev = NULL; |
| 3081 | for (adminp = admin; adminp; adminp = next) { |
| 3082 | next = adminp->next; |
| 3083 | adminp->next = prev; |
| 3084 | prev = adminp; |
| 3085 | } |
| 3086 | admin = prev; |
| 3087 | } |
| 3088 | |
| 3089 | /* Put the variable list the right way round. Not strictly |
| 3090 | necessary, but makes it easier to read. */ |
| 3091 | if (tempvars) { |
| 3092 | TempVar *next, *prev = NULL; |
| 3093 | for (varp = tempvars; varp; varp = next) { |
| 3094 | next = varp->next; |
| 3095 | varp->next = prev; |
| 3096 | prev = varp; |
| 3097 | } |
| 3098 | tempvars = prev; |
| 3099 | } |
| 3100 | |
| 3101 | TRACE_D3("\n"); |
| 3102 | TRACE_D3("------ Acquired the following type entities: ------\n"); |
| 3103 | for (adminp = admin; adminp; adminp = adminp->next) { |
| 3104 | TRACE_D3(" "); |
| 3105 | if (td3) ML_(pp_TyAdmin)( adminp ); |
| 3106 | TRACE_D3("\n"); |
| 3107 | } |
| 3108 | TRACE_D3("\n"); |
| 3109 | TRACE_D3("------ Resolving type entries ------\n"); |
| 3110 | |
| 3111 | resolve_type_entities( admin, tempvars ); |
| 3112 | for (gexpr = gexprs; gexpr; gexpr = gexpr->next) { |
| 3113 | bias_GX( gexpr, di->text_bias ); |
| 3114 | } |
| 3115 | |
| 3116 | TRACE_D3("\n"); |
| 3117 | TRACE_D3("------ Acquired the following variables: ------\n\n"); |
| 3118 | |
| 3119 | /* Park (pointers to) all the vars in an XArray, so we can look up |
| 3120 | abstract origins quickly. The array is sorted (hence, looked-up |
| 3121 | by) the .dioff fields. Since the .dioffs should be instrictly |
| 3122 | ascending order, there is no need to sort the array after |
| 3123 | construction. The ascendingness is however asserted for. */ |
| 3124 | dioff_lookup_tab |
| 3125 | = VG_(newXA)( ML_(dinfo_zalloc), ML_(dinfo_free), |
| 3126 | sizeof(TempVar*) ); |
| 3127 | vg_assert(dioff_lookup_tab); |
| 3128 | varp2 = NULL; |
| 3129 | for (varp = tempvars; varp; varp = varp->next) { |
| 3130 | if (varp2) |
| 3131 | vg_assert(varp2->dioff < varp->dioff); |
| 3132 | VG_(addToXA)( dioff_lookup_tab, &varp ); |
| 3133 | varp2 = varp; |
| 3134 | } |
| 3135 | VG_(setCmpFnXA)( dioff_lookup_tab, cmp_TempVar_by_dioff ); |
| 3136 | VG_(sortXA)( dioff_lookup_tab ); /* POINTLESS; FIXME: rm */ |
| 3137 | |
| 3138 | /* Now visit each var. Collect up as much info as possible for |
| 3139 | each var and hand it to ML_(addVar). */ |
| 3140 | for (varp = tempvars; varp; varp = varp->next) { |
| 3141 | |
| 3142 | /* Possibly show .. */ |
| 3143 | if (td3) { |
| 3144 | VG_(printf)("<%lx> addVar: level %d: %s :: ", |
| 3145 | varp->dioff, |
| 3146 | varp->level, |
| 3147 | varp->name ? varp->name : (UChar*)"<anon_var>" ); |
| 3148 | if (varp->typeR) { |
| 3149 | ML_(pp_Type_C_ishly)( varp->typeR ); |
| 3150 | } else { |
| 3151 | VG_(printf)("NULL"); |
| 3152 | } |
| 3153 | VG_(printf)("\n Loc="); |
| 3154 | if (varp->gexpr) { |
| 3155 | ML_(pp_GX)(varp->gexpr); |
| 3156 | } else { |
| 3157 | VG_(printf)("NULL"); |
| 3158 | } |
| 3159 | VG_(printf)("\n"); |
| 3160 | if (varp->fbGX) { |
| 3161 | VG_(printf)(" FrB="); |
| 3162 | ML_(pp_GX)( varp->fbGX ); |
| 3163 | VG_(printf)("\n"); |
| 3164 | } else { |
| 3165 | VG_(printf)(" FrB=none\n"); |
| 3166 | } |
| 3167 | VG_(printf)(" declared at: %s:%d\n", |
| 3168 | varp->fName ? varp->fName : (UChar*)"NULL", |
| 3169 | varp->fLine ); |
| 3170 | if (varp->absOri != (UWord)D3_INVALID_CUOFF) |
| 3171 | VG_(printf)(" abstract origin: <%lx>\n", varp->absOri); |
| 3172 | } |
| 3173 | |
| 3174 | /* Skip variables which have no location. These must be |
| 3175 | abstract instances; they are useless as-is since with no |
| 3176 | location they have no specified memory location. They will |
| 3177 | presumably be referred to via the absOri fields of other |
| 3178 | variables. */ |
| 3179 | if (!varp->gexpr) { |
| 3180 | TRACE_D3(" SKIP (no location)\n\n"); |
| 3181 | continue; |
| 3182 | } |
| 3183 | |
| 3184 | /* So it has a location, at least. If it refers to some other |
| 3185 | entry through its absOri field, pull in further info through |
| 3186 | that. */ |
| 3187 | if (varp->absOri != (UWord)D3_INVALID_CUOFF) { |
| 3188 | Bool found; |
| 3189 | Word ixFirst, ixLast; |
| 3190 | TempVar key; |
| 3191 | TempVar* keyp = &key; |
| 3192 | TempVar *varAI; |
| 3193 | VG_(memset)(&key, 0, sizeof(key)); /* not necessary */ |
| 3194 | key.dioff = varp->absOri; /* this is what we want to find */ |
| 3195 | found = VG_(lookupXA)( dioff_lookup_tab, &keyp, |
| 3196 | &ixFirst, &ixLast ); |
| 3197 | if (!found) |
| 3198 | barf("DW_AT_abstract_origin can't be resolved"); |
| 3199 | /* If the following fails, there is more than one entry with |
| 3200 | the same dioff. Which can't happen. */ |
| 3201 | vg_assert(ixFirst == ixLast); |
| 3202 | varAI = *(TempVar**)VG_(indexXA)( dioff_lookup_tab, ixFirst ); |
| 3203 | /* stay sane */ |
| 3204 | vg_assert(varAI); |
| 3205 | vg_assert(varAI->dioff == varp->absOri); |
| 3206 | |
| 3207 | /* Copy what useful info we can. */ |
| 3208 | if (varAI->typeR && !varp->typeR) |
| 3209 | varp->typeR = varAI->typeR; |
| 3210 | if (varAI->name && !varp->name) |
| 3211 | varp->name = varAI->name; |
| 3212 | if (varAI->fName && !varp->fName) |
| 3213 | varp->fName = varAI->fName; |
| 3214 | if (varAI->fLine > 0 && varp->fLine == 0) |
| 3215 | varp->fLine = varAI->fLine; |
| 3216 | } |
| 3217 | |
| 3218 | /* Give it a name if it doesn't have one. */ |
| 3219 | if (!varp->name) |
| 3220 | varp->name = ML_(addStr)( di, "<anon_var>", -1 ); |
| 3221 | |
| 3222 | /* So now does it have enough info to be useful? */ |
| 3223 | /* NOTE: re typeR: this is a hack. If typeR is NULL then the |
| 3224 | type didn't get resolved. Really, in that case something's |
| 3225 | broken earlier on, and should be fixed, rather than just |
| 3226 | skipping the variable. */ |
| 3227 | if (!varp->typeR) continue; |
| 3228 | vg_assert(varp->gexpr); |
| 3229 | vg_assert(varp->name); |
| 3230 | vg_assert(varp->typeR); |
| 3231 | vg_assert(varp->level >= 0); |
| 3232 | |
| 3233 | /* Ok. So we're going to keep it. Call ML_(addVar) once for |
| 3234 | each address range in which the variable exists. */ |
| 3235 | TRACE_D3(" ACQUIRE for range(s) "); |
| 3236 | { AddrRange oneRange; |
| 3237 | AddrRange* varPcRanges; |
| 3238 | Word nVarPcRanges; |
| 3239 | /* Set up to iterate over address ranges, however |
| 3240 | represented. */ |
| 3241 | if (varp->nRanges == 0 || varp->nRanges == 1) { |
| 3242 | vg_assert(!varp->rngMany); |
| 3243 | if (varp->nRanges == 0) { |
| 3244 | vg_assert(varp->rngOneMin == 0); |
| 3245 | vg_assert(varp->rngOneMax == 0); |
| 3246 | } |
| 3247 | nVarPcRanges = varp->nRanges; |
| 3248 | oneRange.aMin = varp->rngOneMin; |
| 3249 | oneRange.aMax = varp->rngOneMax; |
| 3250 | varPcRanges = &oneRange; |
| 3251 | } else { |
| 3252 | vg_assert(varp->rngMany); |
| 3253 | vg_assert(varp->rngOneMin == 0); |
| 3254 | vg_assert(varp->rngOneMax == 0); |
| 3255 | nVarPcRanges = VG_(sizeXA)(varp->rngMany); |
| 3256 | vg_assert(nVarPcRanges >= 2); |
| 3257 | vg_assert(nVarPcRanges == (Word)varp->nRanges); |
| 3258 | varPcRanges = VG_(indexXA)(varp->rngMany, 0); |
| 3259 | } |
| 3260 | if (varp->level == 0) |
| 3261 | vg_assert( nVarPcRanges == 1 ); |
| 3262 | /* and iterate */ |
| 3263 | for (i = 0; i < nVarPcRanges; i++) { |
| 3264 | Addr pcMin = varPcRanges[i].aMin; |
| 3265 | Addr pcMax = varPcRanges[i].aMax; |
| 3266 | vg_assert(pcMin <= pcMax); |
| 3267 | /* Level 0 is the global address range. So at level 0 we |
| 3268 | don't want to bias pcMin/pcMax; but at all other levels |
| 3269 | we do since those are derived from svmas in the Dwarf |
| 3270 | we're reading. Be paranoid ... */ |
| 3271 | if (varp->level == 0) { |
| 3272 | vg_assert(pcMin == (Addr)0); |
| 3273 | vg_assert(pcMax == ~(Addr)0); |
| 3274 | } else { |
| 3275 | /* vg_assert(pcMin > (Addr)0); |
| 3276 | No .. we can legitimately expect to see ranges like |
| 3277 | 0x0-0x11D (pre-biasing, of course). */ |
| 3278 | vg_assert(pcMax < ~(Addr)0); |
| 3279 | } |
| 3280 | |
| 3281 | if (i > 0 && (i%2) == 0) TRACE_D3("\n "); |
| 3282 | TRACE_D3("[%p,%p] ", pcMin, pcMax ); |
| 3283 | |
| 3284 | ML_(addVar)( |
| 3285 | di, varp->level, |
| 3286 | pcMin + (varp->level==0 ? 0 : di->text_bias), |
sewardj | 0b5bf91 | 2008-03-07 20:07:58 +0000 | [diff] [blame^] | 3287 | pcMax + (varp->level==0 ? 0 : di->text_bias), |
sewardj | b8b79ad | 2008-03-03 01:35:41 +0000 | [diff] [blame] | 3288 | varp->name, (void*)varp->typeR, |
| 3289 | varp->gexpr, varp->fbGX, |
| 3290 | varp->fName, varp->fLine, td3 |
| 3291 | ); |
| 3292 | } |
| 3293 | } |
| 3294 | |
| 3295 | TRACE_D3("\n\n"); |
| 3296 | /* and move on to the next var */ |
| 3297 | } |
| 3298 | |
| 3299 | /* Now free all the TempVars */ |
| 3300 | for (varp = tempvars; varp; varp = varp2) { |
| 3301 | varp2 = varp->next; |
| 3302 | if (varp->rngMany) |
| 3303 | VG_(deleteXA)(varp->rngMany); |
| 3304 | ML_(dinfo_free)(varp); |
| 3305 | } |
| 3306 | tempvars = NULL; |
| 3307 | |
| 3308 | /* And get rid of the temporary mapping table. */ |
| 3309 | VG_(deleteXA)( dioff_lookup_tab ); |
| 3310 | |
| 3311 | /* record the TyAdmins and the GExprs in di so they can be freed |
| 3312 | later */ |
| 3313 | vg_assert(!di->admin_tyadmins); |
| 3314 | di->admin_tyadmins = admin; |
| 3315 | vg_assert(!di->admin_gexprs); |
| 3316 | di->admin_gexprs = gexprs; |
| 3317 | } |
| 3318 | |
| 3319 | |
| 3320 | /*------------------------------------------------------------*/ |
| 3321 | /*--- ---*/ |
| 3322 | /*--- The "new" DWARF3 reader -- top level control logic ---*/ |
| 3323 | /*--- ---*/ |
| 3324 | /*------------------------------------------------------------*/ |
| 3325 | |
| 3326 | /* --- !!! --- EXTERNAL HEADERS start --- !!! --- */ |
| 3327 | #include <setjmp.h> /* For jmp_buf */ |
| 3328 | /* --- !!! --- EXTERNAL HEADERS end --- !!! --- */ |
| 3329 | |
| 3330 | static Bool d3rd_jmpbuf_valid = False; |
| 3331 | static HChar* d3rd_jmpbuf_reason = NULL; |
| 3332 | static jmp_buf d3rd_jmpbuf; |
| 3333 | |
| 3334 | static __attribute__((noreturn)) void barf ( HChar* reason ) { |
| 3335 | vg_assert(d3rd_jmpbuf_valid); |
| 3336 | d3rd_jmpbuf_reason = reason; |
| 3337 | __builtin_longjmp(&d3rd_jmpbuf, 1); |
| 3338 | /*NOTREACHED*/ |
| 3339 | vg_assert(0); |
| 3340 | } |
| 3341 | |
| 3342 | |
| 3343 | void |
| 3344 | ML_(new_dwarf3_reader) ( |
| 3345 | struct _DebugInfo* di, |
| 3346 | UChar* debug_info_img, SizeT debug_info_sz, |
| 3347 | UChar* debug_abbv_img, SizeT debug_abbv_sz, |
| 3348 | UChar* debug_line_img, SizeT debug_line_sz, |
| 3349 | UChar* debug_str_img, SizeT debug_str_sz, |
| 3350 | UChar* debug_ranges_img, SizeT debug_ranges_sz, |
| 3351 | UChar* debug_loc_img, SizeT debug_loc_sz |
| 3352 | ) |
| 3353 | { |
| 3354 | volatile Int jumped; |
| 3355 | volatile Bool td3 = di->trace_symtab; |
| 3356 | |
| 3357 | /* Run the _wrk function to read the dwarf3. If it succeeds, it |
| 3358 | just returns normally. If there is any failure, it longjmp's |
| 3359 | back here, having first set d3rd_jmpbuf_reason to something |
| 3360 | useful. */ |
| 3361 | vg_assert(d3rd_jmpbuf_valid == False); |
| 3362 | vg_assert(d3rd_jmpbuf_reason == NULL); |
| 3363 | |
| 3364 | d3rd_jmpbuf_valid = True; |
| 3365 | jumped = __builtin_setjmp(&d3rd_jmpbuf); |
| 3366 | if (jumped == 0) { |
| 3367 | /* try this ... */ |
| 3368 | new_dwarf3_reader_wrk( di, barf, |
| 3369 | debug_info_img, debug_info_sz, |
| 3370 | debug_abbv_img, debug_abbv_sz, |
| 3371 | debug_line_img, debug_line_sz, |
| 3372 | debug_str_img, debug_str_sz, |
| 3373 | debug_ranges_img, debug_ranges_sz, |
| 3374 | debug_loc_img, debug_loc_sz ); |
| 3375 | d3rd_jmpbuf_valid = False; |
| 3376 | TRACE_D3("\n------ .debug_info reading was successful ------\n"); |
| 3377 | } else { |
| 3378 | /* It longjmp'd. */ |
| 3379 | d3rd_jmpbuf_valid = False; |
| 3380 | /* Can't longjump without giving some sort of reason. */ |
| 3381 | vg_assert(d3rd_jmpbuf_reason != NULL); |
| 3382 | |
| 3383 | TRACE_D3("\n------ .debug_info reading failed ------\n"); |
| 3384 | |
| 3385 | ML_(symerr)(di, True, d3rd_jmpbuf_reason); |
| 3386 | } |
| 3387 | |
| 3388 | d3rd_jmpbuf_valid = False; |
| 3389 | d3rd_jmpbuf_reason = NULL; |
| 3390 | } |
| 3391 | |
| 3392 | |
| 3393 | |
| 3394 | /* --- Unused code fragments which might be useful one day. --- */ |
| 3395 | |
| 3396 | #if 0 |
| 3397 | /* Read the arange tables */ |
| 3398 | TRACE_SYMTAB("\n"); |
| 3399 | TRACE_SYMTAB("\n------ The contents of .debug_arange ------\n"); |
| 3400 | init_Cursor( &aranges, debug_aranges_img, |
| 3401 | debug_aranges_sz, 0, barf, |
| 3402 | "Overrun whilst reading .debug_aranges section" ); |
| 3403 | while (True) { |
| 3404 | ULong len, d_i_offset; |
| 3405 | Bool is64; |
| 3406 | UShort version; |
| 3407 | UChar asize, segsize; |
| 3408 | |
| 3409 | if (is_at_end_Cursor( &aranges )) |
| 3410 | break; |
| 3411 | /* Read one arange thingy */ |
| 3412 | /* initial_length field */ |
| 3413 | len = get_Initial_Length( &is64, &aranges, |
| 3414 | "in .debug_aranges: invalid initial-length field" ); |
| 3415 | version = get_UShort( &aranges ); |
| 3416 | d_i_offset = get_Dwarfish_UWord( &aranges, is64 ); |
| 3417 | asize = get_UChar( &aranges ); |
| 3418 | segsize = get_UChar( &aranges ); |
| 3419 | TRACE_D3(" Length: %llu\n", len); |
| 3420 | TRACE_D3(" Version: %d\n", (Int)version); |
| 3421 | TRACE_D3(" Offset into .debug_info: %llx\n", d_i_offset); |
| 3422 | TRACE_D3(" Pointer Size: %d\n", (Int)asize); |
| 3423 | TRACE_D3(" Segment Size: %d\n", (Int)segsize); |
| 3424 | TRACE_D3("\n"); |
| 3425 | TRACE_D3(" Address Length\n"); |
| 3426 | |
| 3427 | while ((get_position_of_Cursor( &aranges ) % (2 * asize)) > 0) { |
| 3428 | (void)get_UChar( & aranges ); |
| 3429 | } |
| 3430 | while (True) { |
| 3431 | ULong address = get_Dwarfish_UWord( &aranges, asize==8 ); |
| 3432 | ULong length = get_Dwarfish_UWord( &aranges, asize==8 ); |
| 3433 | TRACE_D3(" 0x%016llx 0x%llx\n", address, length); |
| 3434 | if (address == 0 && length == 0) break; |
| 3435 | } |
| 3436 | } |
| 3437 | TRACE_SYMTAB("\n"); |
| 3438 | #endif |
| 3439 | |
| 3440 | /*--------------------------------------------------------------------*/ |
| 3441 | /*--- end readdwarf3.c ---*/ |
| 3442 | /*--------------------------------------------------------------------*/ |