nethercote | bb1c991 | 2004-01-04 16:43:23 +0000 | [diff] [blame] | 1 | |
njn25 | e49d8e7 | 2002-09-23 09:36:25 +0000 | [diff] [blame] | 2 | /*--------------------------------------------------------------------*/ |
sewardj | 9544807 | 2004-11-22 20:19:51 +0000 | [diff] [blame] | 3 | /*--- Instrument IR to perform memory checking operations. ---*/ |
njn25 | cac76cb | 2002-09-23 11:21:57 +0000 | [diff] [blame] | 4 | /*--- mc_translate.c ---*/ |
njn25 | e49d8e7 | 2002-09-23 09:36:25 +0000 | [diff] [blame] | 5 | /*--------------------------------------------------------------------*/ |
njn | c953984 | 2002-10-02 13:26:35 +0000 | [diff] [blame] | 6 | |
njn25 | e49d8e7 | 2002-09-23 09:36:25 +0000 | [diff] [blame] | 7 | /* |
nethercote | 137bc55 | 2003-11-14 17:47:54 +0000 | [diff] [blame] | 8 | This file is part of MemCheck, a heavyweight Valgrind tool for |
njn | c953984 | 2002-10-02 13:26:35 +0000 | [diff] [blame] | 9 | detecting memory errors. |
njn25 | e49d8e7 | 2002-09-23 09:36:25 +0000 | [diff] [blame] | 10 | |
nethercote | bb1c991 | 2004-01-04 16:43:23 +0000 | [diff] [blame] | 11 | Copyright (C) 2000-2004 Julian Seward |
njn25 | e49d8e7 | 2002-09-23 09:36:25 +0000 | [diff] [blame] | 12 | jseward@acm.org |
| 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 | |
njn25 | cac76cb | 2002-09-23 11:21:57 +0000 | [diff] [blame] | 32 | #include "mc_include.h" |
njn25 | e49d8e7 | 2002-09-23 09:36:25 +0000 | [diff] [blame] | 33 | |
njn25 | e49d8e7 | 2002-09-23 09:36:25 +0000 | [diff] [blame] | 34 | |
sewardj | 9544807 | 2004-11-22 20:19:51 +0000 | [diff] [blame] | 35 | /*------------------------------------------------------------*/ |
| 36 | /*--- Forward decls ---*/ |
| 37 | /*------------------------------------------------------------*/ |
| 38 | |
| 39 | struct _MCEnv; |
| 40 | |
| 41 | static IRType shadowType ( IRType ty ); |
| 42 | static IRExpr* expr2vbits ( struct _MCEnv* mce, IRExpr* e ); |
| 43 | |
| 44 | |
| 45 | /*------------------------------------------------------------*/ |
| 46 | /*--- Memcheck running state, and tmp management. ---*/ |
| 47 | /*------------------------------------------------------------*/ |
| 48 | |
| 49 | /* Carries around state during memcheck instrumentation. */ |
| 50 | typedef |
| 51 | struct _MCEnv { |
| 52 | /* MODIFIED: the bb being constructed. IRStmts are added. */ |
| 53 | IRBB* bb; |
| 54 | |
| 55 | /* MODIFIED: a table [0 .. #temps_in_original_bb-1] which maps |
| 56 | original temps to their current their current shadow temp. |
| 57 | Initially all entries are IRTemp_INVALID. Entries are added |
| 58 | lazily since many original temps are not used due to |
| 59 | optimisation prior to instrumentation. Note that floating |
| 60 | point original tmps are shadowed by integer tmps of the same |
| 61 | size, and Bit-typed original tmps are shadowed by the type |
| 62 | Ity_I8. See comment below. */ |
| 63 | IRTemp* tmpMap; |
| 64 | Int n_originalTmps; /* for range checking */ |
| 65 | |
| 66 | /* READONLY: the guest layout. This indicates which parts of |
| 67 | the guest state should be regarded as 'always defined'. */ |
| 68 | VexGuestLayout* layout; |
| 69 | /* READONLY: the host word type. Needed for constructing |
| 70 | arguments of type 'HWord' to be passed to helper functions. |
| 71 | Ity_I32 or Ity_I64 only. */ |
| 72 | IRType hWordTy; |
| 73 | } |
| 74 | MCEnv; |
| 75 | |
| 76 | /* SHADOW TMP MANAGEMENT. Shadow tmps are allocated lazily (on |
| 77 | demand), as they are encountered. This is for two reasons. |
| 78 | |
| 79 | (1) (less important reason): Many original tmps are unused due to |
| 80 | initial IR optimisation, and we do not want to spaces in tables |
| 81 | tracking them. |
| 82 | |
| 83 | Shadow IRTemps are therefore allocated on demand. mce.tmpMap is a |
| 84 | table indexed [0 .. n_types-1], which gives the current shadow for |
| 85 | each original tmp, or INVALID_IRTEMP if none is so far assigned. |
| 86 | It is necessary to support making multiple assignments to a shadow |
| 87 | -- specifically, after testing a shadow for definedness, it needs |
| 88 | to be made defined. But IR's SSA property disallows this. |
| 89 | |
| 90 | (2) (more important reason): Therefore, when a shadow needs to get |
| 91 | a new value, a new temporary is created, the value is assigned to |
| 92 | that, and the tmpMap is updated to reflect the new binding. |
| 93 | |
| 94 | A corollary is that if the tmpMap maps a given tmp to |
| 95 | INVALID_IRTEMP and we are hoping to read that shadow tmp, it means |
| 96 | there's a read-before-write error in the original tmps. The IR |
| 97 | sanity checker should catch all such anomalies, however. |
njn25 | e49d8e7 | 2002-09-23 09:36:25 +0000 | [diff] [blame] | 98 | */ |
sewardj | 9544807 | 2004-11-22 20:19:51 +0000 | [diff] [blame] | 99 | |
| 100 | /* Find the tmp currently shadowing the given original tmp. If none |
| 101 | so far exists, allocate one. */ |
| 102 | static IRTemp findShadowTmp ( MCEnv* mce, IRTemp orig ) |
njn25 | e49d8e7 | 2002-09-23 09:36:25 +0000 | [diff] [blame] | 103 | { |
sewardj | 9544807 | 2004-11-22 20:19:51 +0000 | [diff] [blame] | 104 | tl_assert(orig < mce->n_originalTmps); |
| 105 | if (mce->tmpMap[orig] == IRTemp_INVALID) { |
| 106 | mce->tmpMap[orig] |
| 107 | = newIRTemp(mce->bb->tyenv, |
| 108 | shadowType(mce->bb->tyenv->types[orig])); |
njn25 | e49d8e7 | 2002-09-23 09:36:25 +0000 | [diff] [blame] | 109 | } |
sewardj | 9544807 | 2004-11-22 20:19:51 +0000 | [diff] [blame] | 110 | return mce->tmpMap[orig]; |
njn25 | e49d8e7 | 2002-09-23 09:36:25 +0000 | [diff] [blame] | 111 | } |
| 112 | |
sewardj | 9544807 | 2004-11-22 20:19:51 +0000 | [diff] [blame] | 113 | /* Allocate a new shadow for the given original tmp. This means any |
| 114 | previous shadow is abandoned. This is needed because it is |
| 115 | necessary to give a new value to a shadow once it has been tested |
| 116 | for undefinedness, but unfortunately IR's SSA property disallows |
| 117 | this. Instead we must abandon the old shadow, allocate a new one |
| 118 | and use that instead. */ |
| 119 | static void newShadowTmp ( MCEnv* mce, IRTemp orig ) |
njn25 | e49d8e7 | 2002-09-23 09:36:25 +0000 | [diff] [blame] | 120 | { |
sewardj | 9544807 | 2004-11-22 20:19:51 +0000 | [diff] [blame] | 121 | tl_assert(orig < mce->n_originalTmps); |
| 122 | mce->tmpMap[orig] |
| 123 | = newIRTemp(mce->bb->tyenv, |
| 124 | shadowType(mce->bb->tyenv->types[orig])); |
| 125 | } |
| 126 | |
| 127 | |
| 128 | /*------------------------------------------------------------*/ |
| 129 | /*--- IRAtoms -- a subset of IRExprs ---*/ |
| 130 | /*------------------------------------------------------------*/ |
| 131 | |
| 132 | /* An atom is either an IRExpr_Const or an IRExpr_Tmp, as defined by |
| 133 | isAtom() in libvex_ir.h. Because this instrumenter expects flat |
| 134 | input, most of this code deals in atoms. Usefully, a value atom |
| 135 | always has a V-value which is also an atom: constants are shadowed |
| 136 | by constants, and temps are shadowed by the corresponding shadow |
| 137 | temporary. */ |
| 138 | |
| 139 | typedef IRExpr IRAtom; |
| 140 | |
| 141 | /* (used for sanity checks only): is this an atom which looks |
| 142 | like it's from original code? */ |
| 143 | static Bool isOriginalAtom ( MCEnv* mce, IRAtom* a1 ) |
| 144 | { |
| 145 | if (a1->tag == Iex_Const) |
| 146 | return True; |
| 147 | if (a1->tag == Iex_Tmp && a1->Iex.Tmp.tmp < mce->n_originalTmps) |
| 148 | return True; |
| 149 | return False; |
| 150 | } |
| 151 | |
| 152 | /* (used for sanity checks only): is this an atom which looks |
| 153 | like it's from shadow code? */ |
| 154 | static Bool isShadowAtom ( MCEnv* mce, IRAtom* a1 ) |
| 155 | { |
| 156 | if (a1->tag == Iex_Const) |
| 157 | return True; |
| 158 | if (a1->tag == Iex_Tmp && a1->Iex.Tmp.tmp >= mce->n_originalTmps) |
| 159 | return True; |
| 160 | return False; |
| 161 | } |
| 162 | |
| 163 | /* (used for sanity checks only): check that both args are atoms and |
| 164 | are identically-kinded. */ |
| 165 | static Bool sameKindedAtoms ( IRAtom* a1, IRAtom* a2 ) |
| 166 | { |
| 167 | if (a1->tag == Iex_Tmp && a1->tag == Iex_Tmp) |
| 168 | return True; |
| 169 | if (a1->tag == Iex_Const && a1->tag == Iex_Const) |
| 170 | return True; |
| 171 | return False; |
| 172 | } |
| 173 | |
| 174 | |
| 175 | /*------------------------------------------------------------*/ |
| 176 | /*--- Type management ---*/ |
| 177 | /*------------------------------------------------------------*/ |
| 178 | |
| 179 | /* Shadow state is always accessed using integer types. This returns |
| 180 | an integer type with the same size (as per sizeofIRType) as the |
| 181 | given type. The only valid shadow types are Bit, I8, I16, I32, |
sewardj | 3245c91 | 2004-12-10 14:58:26 +0000 | [diff] [blame^] | 182 | I64, V128. */ |
sewardj | 9544807 | 2004-11-22 20:19:51 +0000 | [diff] [blame] | 183 | |
| 184 | static IRType shadowType ( IRType ty ) |
| 185 | { |
| 186 | switch (ty) { |
| 187 | case Ity_I1: |
| 188 | case Ity_I8: |
| 189 | case Ity_I16: |
| 190 | case Ity_I32: |
sewardj | 3245c91 | 2004-12-10 14:58:26 +0000 | [diff] [blame^] | 191 | case Ity_I64: return ty; |
| 192 | case Ity_F32: return Ity_I32; |
| 193 | case Ity_F64: return Ity_I64; |
| 194 | case Ity_V128: return Ity_V128; |
sewardj | 9544807 | 2004-11-22 20:19:51 +0000 | [diff] [blame] | 195 | default: ppIRType(ty); |
| 196 | VG_(tool_panic)("memcheck:shadowType"); |
| 197 | } |
| 198 | } |
| 199 | |
| 200 | /* Produce a 'defined' value of the given shadow type. Should only be |
| 201 | supplied shadow types (Bit/I8/I16/I32/UI64). */ |
| 202 | static IRExpr* definedOfType ( IRType ty ) { |
| 203 | switch (ty) { |
| 204 | case Ity_I1: return IRExpr_Const(IRConst_U1(False)); |
| 205 | case Ity_I8: return IRExpr_Const(IRConst_U8(0)); |
| 206 | case Ity_I16: return IRExpr_Const(IRConst_U16(0)); |
| 207 | case Ity_I32: return IRExpr_Const(IRConst_U32(0)); |
| 208 | case Ity_I64: return IRExpr_Const(IRConst_U64(0)); |
| 209 | default: VG_(tool_panic)("memcheck:definedOfType"); |
njn25 | e49d8e7 | 2002-09-23 09:36:25 +0000 | [diff] [blame] | 210 | } |
| 211 | } |
| 212 | |
| 213 | |
sewardj | 9544807 | 2004-11-22 20:19:51 +0000 | [diff] [blame] | 214 | /*------------------------------------------------------------*/ |
| 215 | /*--- Constructing IR fragments ---*/ |
| 216 | /*------------------------------------------------------------*/ |
| 217 | |
| 218 | /* assign value to tmp */ |
| 219 | #define assign(_bb,_tmp,_expr) \ |
| 220 | addStmtToIRBB((_bb), IRStmt_Tmp((_tmp),(_expr))) |
| 221 | |
| 222 | /* add stmt to a bb */ |
| 223 | #define stmt(_bb,_stmt) \ |
| 224 | addStmtToIRBB((_bb), (_stmt)) |
| 225 | |
| 226 | /* build various kinds of expressions */ |
| 227 | #define binop(_op, _arg1, _arg2) IRExpr_Binop((_op),(_arg1),(_arg2)) |
| 228 | #define unop(_op, _arg) IRExpr_Unop((_op),(_arg)) |
| 229 | #define mkU8(_n) IRExpr_Const(IRConst_U8(_n)) |
| 230 | #define mkU16(_n) IRExpr_Const(IRConst_U16(_n)) |
| 231 | #define mkU32(_n) IRExpr_Const(IRConst_U32(_n)) |
| 232 | #define mkU64(_n) IRExpr_Const(IRConst_U64(_n)) |
| 233 | #define mkexpr(_tmp) IRExpr_Tmp((_tmp)) |
| 234 | |
| 235 | /* bind the given expression to a new temporary, and return the |
| 236 | temporary. This effectively converts an arbitrary expression into |
| 237 | an atom. */ |
| 238 | static IRAtom* assignNew ( MCEnv* mce, IRType ty, IRExpr* e ) { |
| 239 | IRTemp t = newIRTemp(mce->bb->tyenv, ty); |
| 240 | assign(mce->bb, t, e); |
| 241 | return mkexpr(t); |
| 242 | } |
| 243 | |
| 244 | |
| 245 | /*------------------------------------------------------------*/ |
| 246 | /*--- Constructing definedness primitive ops ---*/ |
| 247 | /*------------------------------------------------------------*/ |
| 248 | |
| 249 | /* --------- Defined-if-either-defined --------- */ |
| 250 | |
| 251 | static IRAtom* mkDifD8 ( MCEnv* mce, IRAtom* a1, IRAtom* a2 ) { |
| 252 | tl_assert(isShadowAtom(mce,a1)); |
| 253 | tl_assert(isShadowAtom(mce,a2)); |
| 254 | return assignNew(mce, Ity_I8, binop(Iop_And8, a1, a2)); |
| 255 | } |
| 256 | |
| 257 | static IRAtom* mkDifD16 ( MCEnv* mce, IRAtom* a1, IRAtom* a2 ) { |
| 258 | tl_assert(isShadowAtom(mce,a1)); |
| 259 | tl_assert(isShadowAtom(mce,a2)); |
| 260 | return assignNew(mce, Ity_I16, binop(Iop_And16, a1, a2)); |
| 261 | } |
| 262 | |
| 263 | static IRAtom* mkDifD32 ( MCEnv* mce, IRAtom* a1, IRAtom* a2 ) { |
| 264 | tl_assert(isShadowAtom(mce,a1)); |
| 265 | tl_assert(isShadowAtom(mce,a2)); |
| 266 | return assignNew(mce, Ity_I32, binop(Iop_And32, a1, a2)); |
| 267 | } |
| 268 | |
sewardj | 7010f6e | 2004-12-10 13:35:22 +0000 | [diff] [blame] | 269 | static IRAtom* mkDifD64 ( MCEnv* mce, IRAtom* a1, IRAtom* a2 ) { |
| 270 | tl_assert(isShadowAtom(mce,a1)); |
| 271 | tl_assert(isShadowAtom(mce,a2)); |
| 272 | return assignNew(mce, Ity_I64, binop(Iop_And64, a1, a2)); |
| 273 | } |
| 274 | |
sewardj | 9544807 | 2004-11-22 20:19:51 +0000 | [diff] [blame] | 275 | /* --------- Undefined-if-either-undefined --------- */ |
| 276 | |
| 277 | static IRAtom* mkUifU8 ( MCEnv* mce, IRAtom* a1, IRAtom* a2 ) { |
| 278 | tl_assert(isShadowAtom(mce,a1)); |
| 279 | tl_assert(isShadowAtom(mce,a2)); |
| 280 | return assignNew(mce, Ity_I8, binop(Iop_Or8, a1, a2)); |
| 281 | } |
| 282 | |
| 283 | static IRAtom* mkUifU16 ( MCEnv* mce, IRAtom* a1, IRAtom* a2 ) { |
| 284 | tl_assert(isShadowAtom(mce,a1)); |
| 285 | tl_assert(isShadowAtom(mce,a2)); |
| 286 | return assignNew(mce, Ity_I16, binop(Iop_Or16, a1, a2)); |
| 287 | } |
| 288 | |
| 289 | static IRAtom* mkUifU32 ( MCEnv* mce, IRAtom* a1, IRAtom* a2 ) { |
| 290 | tl_assert(isShadowAtom(mce,a1)); |
| 291 | tl_assert(isShadowAtom(mce,a2)); |
| 292 | return assignNew(mce, Ity_I32, binop(Iop_Or32, a1, a2)); |
| 293 | } |
| 294 | |
| 295 | static IRAtom* mkUifU64 ( MCEnv* mce, IRAtom* a1, IRAtom* a2 ) { |
| 296 | tl_assert(isShadowAtom(mce,a1)); |
| 297 | tl_assert(isShadowAtom(mce,a2)); |
| 298 | return assignNew(mce, Ity_I64, binop(Iop_Or64, a1, a2)); |
| 299 | } |
| 300 | |
sewardj | 3245c91 | 2004-12-10 14:58:26 +0000 | [diff] [blame^] | 301 | static IRAtom* mkUifU128 ( MCEnv* mce, IRAtom* a1, IRAtom* a2 ) { |
| 302 | tl_assert(isShadowAtom(mce,a1)); |
| 303 | tl_assert(isShadowAtom(mce,a2)); |
| 304 | return assignNew(mce, Ity_V128, binop(Iop_Or128, a1, a2)); |
| 305 | } |
| 306 | |
sewardj | 9544807 | 2004-11-22 20:19:51 +0000 | [diff] [blame] | 307 | static IRAtom* mkUifU ( MCEnv* mce, IRType vty, IRAtom* a1, IRAtom* a2 ) { |
| 308 | switch (vty) { |
| 309 | case Ity_I16: return mkUifU16(mce, a1, a2); |
| 310 | case Ity_I32: return mkUifU32(mce, a1, a2); |
| 311 | case Ity_I64: return mkUifU64(mce, a1, a2); |
| 312 | default: |
| 313 | VG_(printf)("\n"); ppIRType(vty); VG_(printf)("\n"); |
| 314 | VG_(tool_panic)("memcheck:mkUifU"); |
njn25 | e49d8e7 | 2002-09-23 09:36:25 +0000 | [diff] [blame] | 315 | } |
| 316 | } |
| 317 | |
sewardj | 9544807 | 2004-11-22 20:19:51 +0000 | [diff] [blame] | 318 | /* --------- The Left-family of operations. --------- */ |
njn25 | e49d8e7 | 2002-09-23 09:36:25 +0000 | [diff] [blame] | 319 | |
sewardj | 9544807 | 2004-11-22 20:19:51 +0000 | [diff] [blame] | 320 | static IRAtom* mkLeft8 ( MCEnv* mce, IRAtom* a1 ) { |
| 321 | tl_assert(isShadowAtom(mce,a1)); |
| 322 | /* It's safe to duplicate a1 since it's only an atom */ |
| 323 | return assignNew(mce, Ity_I8, |
| 324 | binop(Iop_Or8, a1, |
| 325 | assignNew(mce, Ity_I8, |
| 326 | /* unop(Iop_Neg8, a1)))); */ |
| 327 | binop(Iop_Sub8, mkU8(0), a1) ))); |
| 328 | } |
| 329 | |
| 330 | static IRAtom* mkLeft16 ( MCEnv* mce, IRAtom* a1 ) { |
| 331 | tl_assert(isShadowAtom(mce,a1)); |
| 332 | /* It's safe to duplicate a1 since it's only an atom */ |
| 333 | return assignNew(mce, Ity_I16, |
| 334 | binop(Iop_Or16, a1, |
| 335 | assignNew(mce, Ity_I16, |
| 336 | /* unop(Iop_Neg16, a1)))); */ |
| 337 | binop(Iop_Sub16, mkU16(0), a1) ))); |
| 338 | } |
| 339 | |
| 340 | static IRAtom* mkLeft32 ( MCEnv* mce, IRAtom* a1 ) { |
| 341 | tl_assert(isShadowAtom(mce,a1)); |
| 342 | /* It's safe to duplicate a1 since it's only an atom */ |
| 343 | return assignNew(mce, Ity_I32, |
| 344 | binop(Iop_Or32, a1, |
| 345 | assignNew(mce, Ity_I32, |
| 346 | /* unop(Iop_Neg32, a1)))); */ |
| 347 | binop(Iop_Sub32, mkU32(0), a1) ))); |
| 348 | } |
| 349 | |
| 350 | /* --------- 'Improvement' functions for AND/OR. --------- */ |
| 351 | |
| 352 | /* ImproveAND(data, vbits) = data OR vbits. Defined (0) data 0s give |
| 353 | defined (0); all other -> undefined (1). |
| 354 | */ |
| 355 | static IRAtom* mkImproveAND8 ( MCEnv* mce, IRAtom* data, IRAtom* vbits ) |
njn25 | e49d8e7 | 2002-09-23 09:36:25 +0000 | [diff] [blame] | 356 | { |
sewardj | 9544807 | 2004-11-22 20:19:51 +0000 | [diff] [blame] | 357 | tl_assert(isOriginalAtom(mce, data)); |
| 358 | tl_assert(isShadowAtom(mce, vbits)); |
| 359 | tl_assert(sameKindedAtoms(data, vbits)); |
| 360 | return assignNew(mce, Ity_I8, binop(Iop_Or8, data, vbits)); |
| 361 | } |
njn25 | e49d8e7 | 2002-09-23 09:36:25 +0000 | [diff] [blame] | 362 | |
sewardj | 9544807 | 2004-11-22 20:19:51 +0000 | [diff] [blame] | 363 | static IRAtom* mkImproveAND16 ( MCEnv* mce, IRAtom* data, IRAtom* vbits ) |
| 364 | { |
| 365 | tl_assert(isOriginalAtom(mce, data)); |
| 366 | tl_assert(isShadowAtom(mce, vbits)); |
| 367 | tl_assert(sameKindedAtoms(data, vbits)); |
| 368 | return assignNew(mce, Ity_I16, binop(Iop_Or16, data, vbits)); |
| 369 | } |
njn25 | e49d8e7 | 2002-09-23 09:36:25 +0000 | [diff] [blame] | 370 | |
sewardj | 9544807 | 2004-11-22 20:19:51 +0000 | [diff] [blame] | 371 | static IRAtom* mkImproveAND32 ( MCEnv* mce, IRAtom* data, IRAtom* vbits ) |
| 372 | { |
| 373 | tl_assert(isOriginalAtom(mce, data)); |
| 374 | tl_assert(isShadowAtom(mce, vbits)); |
| 375 | tl_assert(sameKindedAtoms(data, vbits)); |
| 376 | return assignNew(mce, Ity_I32, binop(Iop_Or32, data, vbits)); |
| 377 | } |
njn25 | e49d8e7 | 2002-09-23 09:36:25 +0000 | [diff] [blame] | 378 | |
sewardj | 7010f6e | 2004-12-10 13:35:22 +0000 | [diff] [blame] | 379 | static IRAtom* mkImproveAND64 ( MCEnv* mce, IRAtom* data, IRAtom* vbits ) |
| 380 | { |
| 381 | tl_assert(isOriginalAtom(mce, data)); |
| 382 | tl_assert(isShadowAtom(mce, vbits)); |
| 383 | tl_assert(sameKindedAtoms(data, vbits)); |
| 384 | return assignNew(mce, Ity_I64, binop(Iop_Or64, data, vbits)); |
| 385 | } |
| 386 | |
sewardj | 9544807 | 2004-11-22 20:19:51 +0000 | [diff] [blame] | 387 | /* ImproveOR(data, vbits) = ~data OR vbits. Defined (0) data 1s give |
| 388 | defined (0); all other -> undefined (1). |
| 389 | */ |
| 390 | static IRAtom* mkImproveOR8 ( MCEnv* mce, IRAtom* data, IRAtom* vbits ) |
| 391 | { |
| 392 | tl_assert(isOriginalAtom(mce, data)); |
| 393 | tl_assert(isShadowAtom(mce, vbits)); |
| 394 | tl_assert(sameKindedAtoms(data, vbits)); |
| 395 | return assignNew( |
| 396 | mce, Ity_I8, |
| 397 | binop(Iop_Or8, |
| 398 | assignNew(mce, Ity_I8, unop(Iop_Not8, data)), |
| 399 | vbits) ); |
| 400 | } |
njn25 | e49d8e7 | 2002-09-23 09:36:25 +0000 | [diff] [blame] | 401 | |
sewardj | 9544807 | 2004-11-22 20:19:51 +0000 | [diff] [blame] | 402 | static IRAtom* mkImproveOR16 ( MCEnv* mce, IRAtom* data, IRAtom* vbits ) |
| 403 | { |
| 404 | tl_assert(isOriginalAtom(mce, data)); |
| 405 | tl_assert(isShadowAtom(mce, vbits)); |
| 406 | tl_assert(sameKindedAtoms(data, vbits)); |
| 407 | return assignNew( |
| 408 | mce, Ity_I16, |
| 409 | binop(Iop_Or16, |
| 410 | assignNew(mce, Ity_I16, unop(Iop_Not16, data)), |
| 411 | vbits) ); |
| 412 | } |
njn25 | e49d8e7 | 2002-09-23 09:36:25 +0000 | [diff] [blame] | 413 | |
sewardj | 9544807 | 2004-11-22 20:19:51 +0000 | [diff] [blame] | 414 | static IRAtom* mkImproveOR32 ( MCEnv* mce, IRAtom* data, IRAtom* vbits ) |
| 415 | { |
| 416 | tl_assert(isOriginalAtom(mce, data)); |
| 417 | tl_assert(isShadowAtom(mce, vbits)); |
| 418 | tl_assert(sameKindedAtoms(data, vbits)); |
| 419 | return assignNew( |
| 420 | mce, Ity_I32, |
| 421 | binop(Iop_Or32, |
| 422 | assignNew(mce, Ity_I32, unop(Iop_Not32, data)), |
| 423 | vbits) ); |
| 424 | } |
| 425 | |
sewardj | 7010f6e | 2004-12-10 13:35:22 +0000 | [diff] [blame] | 426 | static IRAtom* mkImproveOR64 ( MCEnv* mce, IRAtom* data, IRAtom* vbits ) |
| 427 | { |
| 428 | tl_assert(isOriginalAtom(mce, data)); |
| 429 | tl_assert(isShadowAtom(mce, vbits)); |
| 430 | tl_assert(sameKindedAtoms(data, vbits)); |
| 431 | return assignNew( |
| 432 | mce, Ity_I64, |
| 433 | binop(Iop_Or64, |
| 434 | assignNew(mce, Ity_I64, unop(Iop_Not64, data)), |
| 435 | vbits) ); |
| 436 | } |
| 437 | |
sewardj | 9544807 | 2004-11-22 20:19:51 +0000 | [diff] [blame] | 438 | /* --------- Pessimising casts. --------- */ |
| 439 | |
| 440 | static IRAtom* mkPCastTo( MCEnv* mce, IRType dst_ty, IRAtom* vbits ) |
| 441 | { |
sewardj | 7cf97ee | 2004-11-28 14:25:01 +0000 | [diff] [blame] | 442 | IRType ty; |
| 443 | IRAtom* tmp1; |
sewardj | 9544807 | 2004-11-22 20:19:51 +0000 | [diff] [blame] | 444 | /* Note, dst_ty is a shadow type, not an original type. */ |
| 445 | /* First of all, collapse vbits down to a single bit. */ |
| 446 | tl_assert(isShadowAtom(mce,vbits)); |
sewardj | 7cf97ee | 2004-11-28 14:25:01 +0000 | [diff] [blame] | 447 | ty = typeOfIRExpr(mce->bb->tyenv, vbits); |
| 448 | tmp1 = NULL; |
sewardj | 9544807 | 2004-11-22 20:19:51 +0000 | [diff] [blame] | 449 | switch (ty) { |
| 450 | case Ity_I1: |
| 451 | tmp1 = vbits; |
njn25 | e49d8e7 | 2002-09-23 09:36:25 +0000 | [diff] [blame] | 452 | break; |
sewardj | 9544807 | 2004-11-22 20:19:51 +0000 | [diff] [blame] | 453 | case Ity_I8: |
| 454 | tmp1 = assignNew(mce, Ity_I1, binop(Iop_CmpNE8, vbits, mkU8(0))); |
| 455 | break; |
| 456 | case Ity_I16: |
| 457 | tmp1 = assignNew(mce, Ity_I1, binop(Iop_CmpNE16, vbits, mkU16(0))); |
| 458 | break; |
| 459 | case Ity_I32: |
| 460 | tmp1 = assignNew(mce, Ity_I1, binop(Iop_CmpNE32, vbits, mkU32(0))); |
| 461 | break; |
| 462 | case Ity_I64: |
| 463 | tmp1 = assignNew(mce, Ity_I1, binop(Iop_CmpNE64, vbits, mkU64(0))); |
| 464 | break; |
| 465 | default: |
| 466 | VG_(tool_panic)("mkPCastTo(1)"); |
| 467 | } |
| 468 | tl_assert(tmp1); |
| 469 | /* Now widen up to the dst type. */ |
| 470 | switch (dst_ty) { |
| 471 | case Ity_I1: |
| 472 | return tmp1; |
| 473 | case Ity_I8: |
| 474 | return assignNew(mce, Ity_I8, unop(Iop_1Sto8, tmp1)); |
| 475 | case Ity_I16: |
| 476 | return assignNew(mce, Ity_I16, unop(Iop_1Sto16, tmp1)); |
| 477 | case Ity_I32: |
| 478 | return assignNew(mce, Ity_I32, unop(Iop_1Sto32, tmp1)); |
| 479 | case Ity_I64: |
| 480 | return assignNew(mce, Ity_I64, unop(Iop_1Sto64, tmp1)); |
| 481 | default: |
| 482 | ppIRType(dst_ty); |
| 483 | VG_(tool_panic)("mkPCastTo(2)"); |
| 484 | } |
| 485 | } |
| 486 | |
| 487 | |
| 488 | /*------------------------------------------------------------*/ |
| 489 | /*--- Emit a test and complaint if something is undefined. ---*/ |
| 490 | /*------------------------------------------------------------*/ |
| 491 | |
| 492 | /* Set the annotations on a dirty helper to indicate that the stack |
| 493 | pointer and instruction pointers might be read. This is the |
| 494 | behaviour of all 'emit-a-complaint' style functions we might |
| 495 | call. */ |
| 496 | |
| 497 | static void setHelperAnns ( MCEnv* mce, IRDirty* di ) { |
| 498 | di->nFxState = 2; |
| 499 | di->fxState[0].fx = Ifx_Read; |
| 500 | di->fxState[0].offset = mce->layout->offset_SP; |
| 501 | di->fxState[0].size = mce->layout->sizeof_SP; |
| 502 | di->fxState[1].fx = Ifx_Read; |
| 503 | di->fxState[1].offset = mce->layout->offset_IP; |
| 504 | di->fxState[1].size = mce->layout->sizeof_IP; |
| 505 | } |
| 506 | |
| 507 | |
| 508 | /* Check the supplied **original** atom for undefinedness, and emit a |
| 509 | complaint if so. Once that happens, mark it as defined. This is |
| 510 | possible because the atom is either a tmp or literal. If it's a |
| 511 | tmp, it will be shadowed by a tmp, and so we can set the shadow to |
| 512 | be defined. In fact as mentioned above, we will have to allocate a |
| 513 | new tmp to carry the new 'defined' shadow value, and update the |
| 514 | original->tmp mapping accordingly; we cannot simply assign a new |
| 515 | value to an existing shadow tmp as this breaks SSAness -- resulting |
| 516 | in the post-instrumentation sanity checker spluttering in disapproval. |
| 517 | */ |
| 518 | static void complainIfUndefined ( MCEnv* mce, IRAtom* atom ) |
| 519 | { |
sewardj | 7cf97ee | 2004-11-28 14:25:01 +0000 | [diff] [blame] | 520 | IRAtom* vatom; |
| 521 | IRType ty; |
| 522 | Int sz; |
| 523 | IRDirty* di; |
| 524 | IRAtom* cond; |
| 525 | |
sewardj | 9544807 | 2004-11-22 20:19:51 +0000 | [diff] [blame] | 526 | /* Since the original expression is atomic, there's no duplicated |
| 527 | work generated by making multiple V-expressions for it. So we |
| 528 | don't really care about the possibility that someone else may |
| 529 | also create a V-interpretion for it. */ |
| 530 | tl_assert(isOriginalAtom(mce, atom)); |
sewardj | 7cf97ee | 2004-11-28 14:25:01 +0000 | [diff] [blame] | 531 | vatom = expr2vbits( mce, atom ); |
sewardj | 9544807 | 2004-11-22 20:19:51 +0000 | [diff] [blame] | 532 | tl_assert(isShadowAtom(mce, vatom)); |
| 533 | tl_assert(sameKindedAtoms(atom, vatom)); |
| 534 | |
sewardj | 7cf97ee | 2004-11-28 14:25:01 +0000 | [diff] [blame] | 535 | ty = typeOfIRExpr(mce->bb->tyenv, vatom); |
sewardj | 9544807 | 2004-11-22 20:19:51 +0000 | [diff] [blame] | 536 | |
| 537 | /* sz is only used for constructing the error message */ |
sewardj | 7cf97ee | 2004-11-28 14:25:01 +0000 | [diff] [blame] | 538 | sz = ty==Ity_I1 ? 0 : sizeofIRType(ty); |
sewardj | 9544807 | 2004-11-22 20:19:51 +0000 | [diff] [blame] | 539 | |
sewardj | 7cf97ee | 2004-11-28 14:25:01 +0000 | [diff] [blame] | 540 | cond = mkPCastTo( mce, Ity_I1, vatom ); |
sewardj | 9544807 | 2004-11-22 20:19:51 +0000 | [diff] [blame] | 541 | /* cond will be 0 if all defined, and 1 if any not defined. */ |
| 542 | |
sewardj | 9544807 | 2004-11-22 20:19:51 +0000 | [diff] [blame] | 543 | switch (sz) { |
| 544 | case 0: |
| 545 | di = unsafeIRDirty_0_N( 0/*regparms*/, |
| 546 | "MC_(helperc_value_check0_fail)", |
| 547 | &MC_(helperc_value_check0_fail), |
| 548 | mkIRExprVec_0() |
| 549 | ); |
| 550 | break; |
| 551 | case 1: |
| 552 | di = unsafeIRDirty_0_N( 0/*regparms*/, |
| 553 | "MC_(helperc_value_check1_fail)", |
| 554 | &MC_(helperc_value_check1_fail), |
| 555 | mkIRExprVec_0() |
| 556 | ); |
| 557 | break; |
| 558 | case 4: |
| 559 | di = unsafeIRDirty_0_N( 0/*regparms*/, |
| 560 | "MC_(helperc_value_check4_fail)", |
| 561 | &MC_(helperc_value_check4_fail), |
| 562 | mkIRExprVec_0() |
| 563 | ); |
| 564 | break; |
| 565 | default: |
| 566 | di = unsafeIRDirty_0_N( 1/*regparms*/, |
| 567 | "MC_(helperc_complain_undef)", |
| 568 | &MC_(helperc_complain_undef), |
| 569 | mkIRExprVec_1( mkIRExpr_HWord( sz )) |
| 570 | ); |
| 571 | break; |
| 572 | } |
| 573 | di->guard = cond; |
| 574 | setHelperAnns( mce, di ); |
| 575 | stmt( mce->bb, IRStmt_Dirty(di)); |
| 576 | |
| 577 | /* Set the shadow tmp to be defined. First, update the |
| 578 | orig->shadow tmp mapping to reflect the fact that this shadow is |
| 579 | getting a new value. */ |
| 580 | tl_assert(isAtom(vatom)); |
| 581 | /* sameKindedAtoms ... */ |
| 582 | if (vatom->tag == Iex_Tmp) { |
| 583 | tl_assert(atom->tag == Iex_Tmp); |
| 584 | newShadowTmp(mce, atom->Iex.Tmp.tmp); |
| 585 | assign(mce->bb, findShadowTmp(mce, atom->Iex.Tmp.tmp), |
| 586 | definedOfType(ty)); |
| 587 | } |
| 588 | } |
| 589 | |
| 590 | |
| 591 | /*------------------------------------------------------------*/ |
| 592 | /*--- Shadowing PUTs/GETs, and indexed variants thereof ---*/ |
| 593 | /*------------------------------------------------------------*/ |
| 594 | |
| 595 | /* Examine the always-defined sections declared in layout to see if |
| 596 | the (offset,size) section is within one. Note, is is an error to |
| 597 | partially fall into such a region: (offset,size) should either be |
| 598 | completely in such a region or completely not-in such a region. |
| 599 | */ |
| 600 | static Bool isAlwaysDefd ( MCEnv* mce, Int offset, Int size ) |
| 601 | { |
| 602 | Int minoffD, maxoffD, i; |
| 603 | Int minoff = offset; |
| 604 | Int maxoff = minoff + size - 1; |
| 605 | tl_assert((minoff & ~0xFFFF) == 0); |
| 606 | tl_assert((maxoff & ~0xFFFF) == 0); |
| 607 | |
| 608 | for (i = 0; i < mce->layout->n_alwaysDefd; i++) { |
| 609 | minoffD = mce->layout->alwaysDefd[i].offset; |
| 610 | maxoffD = minoffD + mce->layout->alwaysDefd[i].size - 1; |
| 611 | tl_assert((minoffD & ~0xFFFF) == 0); |
| 612 | tl_assert((maxoffD & ~0xFFFF) == 0); |
| 613 | |
| 614 | if (maxoff < minoffD || maxoffD < minoff) |
| 615 | continue; /* no overlap */ |
| 616 | if (minoff >= minoffD && maxoff <= maxoffD) |
| 617 | return True; /* completely contained in an always-defd section */ |
| 618 | |
| 619 | VG_(tool_panic)("memcheck:isAlwaysDefd:partial overlap"); |
| 620 | } |
| 621 | return False; /* could not find any containing section */ |
| 622 | } |
| 623 | |
| 624 | |
| 625 | /* Generate into bb suitable actions to shadow this Put. If the state |
| 626 | slice is marked 'always defined', do nothing. Otherwise, write the |
| 627 | supplied V bits to the shadow state. We can pass in either an |
| 628 | original atom or a V-atom, but not both. In the former case the |
| 629 | relevant V-bits are then generated from the original. |
| 630 | */ |
| 631 | static |
| 632 | void do_shadow_PUT ( MCEnv* mce, Int offset, |
| 633 | IRAtom* atom, IRAtom* vatom ) |
| 634 | { |
sewardj | 7cf97ee | 2004-11-28 14:25:01 +0000 | [diff] [blame] | 635 | IRType ty; |
sewardj | 9544807 | 2004-11-22 20:19:51 +0000 | [diff] [blame] | 636 | if (atom) { |
| 637 | tl_assert(!vatom); |
| 638 | tl_assert(isOriginalAtom(mce, atom)); |
| 639 | vatom = expr2vbits( mce, atom ); |
| 640 | } else { |
| 641 | tl_assert(vatom); |
| 642 | tl_assert(isShadowAtom(mce, vatom)); |
| 643 | } |
| 644 | |
sewardj | 7cf97ee | 2004-11-28 14:25:01 +0000 | [diff] [blame] | 645 | ty = typeOfIRExpr(mce->bb->tyenv, vatom); |
sewardj | 9544807 | 2004-11-22 20:19:51 +0000 | [diff] [blame] | 646 | tl_assert(ty != Ity_I1); |
| 647 | if (isAlwaysDefd(mce, offset, sizeofIRType(ty))) { |
| 648 | /* later: no ... */ |
| 649 | /* emit code to emit a complaint if any of the vbits are 1. */ |
| 650 | /* complainIfUndefined(mce, atom); */ |
| 651 | } else { |
| 652 | /* Do a plain shadow Put. */ |
| 653 | stmt( mce->bb, IRStmt_Put( offset + mce->layout->total_sizeB, vatom ) ); |
| 654 | } |
| 655 | } |
| 656 | |
| 657 | |
| 658 | /* Return an expression which contains the V bits corresponding to the |
| 659 | given GETI (passed in in pieces). |
| 660 | */ |
| 661 | static |
| 662 | void do_shadow_PUTI ( MCEnv* mce, |
| 663 | IRArray* descr, IRAtom* ix, Int bias, IRAtom* atom ) |
| 664 | { |
sewardj | 7cf97ee | 2004-11-28 14:25:01 +0000 | [diff] [blame] | 665 | IRAtom* vatom; |
| 666 | IRType ty, tyS; |
| 667 | Int arrSize;; |
| 668 | |
sewardj | 9544807 | 2004-11-22 20:19:51 +0000 | [diff] [blame] | 669 | tl_assert(isOriginalAtom(mce,atom)); |
sewardj | 7cf97ee | 2004-11-28 14:25:01 +0000 | [diff] [blame] | 670 | vatom = expr2vbits( mce, atom ); |
sewardj | 9544807 | 2004-11-22 20:19:51 +0000 | [diff] [blame] | 671 | tl_assert(sameKindedAtoms(atom, vatom)); |
sewardj | 7cf97ee | 2004-11-28 14:25:01 +0000 | [diff] [blame] | 672 | ty = descr->elemTy; |
| 673 | tyS = shadowType(ty); |
| 674 | arrSize = descr->nElems * sizeofIRType(ty); |
sewardj | 9544807 | 2004-11-22 20:19:51 +0000 | [diff] [blame] | 675 | tl_assert(ty != Ity_I1); |
| 676 | tl_assert(isOriginalAtom(mce,ix)); |
| 677 | complainIfUndefined(mce,ix); |
| 678 | if (isAlwaysDefd(mce, descr->base, arrSize)) { |
| 679 | /* later: no ... */ |
| 680 | /* emit code to emit a complaint if any of the vbits are 1. */ |
| 681 | /* complainIfUndefined(mce, atom); */ |
| 682 | } else { |
| 683 | /* Do a cloned version of the Put that refers to the shadow |
| 684 | area. */ |
| 685 | IRArray* new_descr |
| 686 | = mkIRArray( descr->base + mce->layout->total_sizeB, |
| 687 | tyS, descr->nElems); |
| 688 | stmt( mce->bb, IRStmt_PutI( new_descr, ix, bias, vatom )); |
| 689 | } |
| 690 | } |
| 691 | |
| 692 | |
| 693 | /* Return an expression which contains the V bits corresponding to the |
| 694 | given GET (passed in in pieces). |
| 695 | */ |
| 696 | static |
| 697 | IRExpr* shadow_GET ( MCEnv* mce, Int offset, IRType ty ) |
| 698 | { |
| 699 | IRType tyS = shadowType(ty); |
| 700 | tl_assert(ty != Ity_I1); |
| 701 | if (isAlwaysDefd(mce, offset, sizeofIRType(ty))) { |
| 702 | /* Always defined, return all zeroes of the relevant type */ |
| 703 | return definedOfType(tyS); |
| 704 | } else { |
| 705 | /* return a cloned version of the Get that refers to the shadow |
| 706 | area. */ |
| 707 | return IRExpr_Get( offset + mce->layout->total_sizeB, tyS ); |
| 708 | } |
| 709 | } |
| 710 | |
| 711 | |
| 712 | /* Return an expression which contains the V bits corresponding to the |
| 713 | given GETI (passed in in pieces). |
| 714 | */ |
| 715 | static |
| 716 | IRExpr* shadow_GETI ( MCEnv* mce, IRArray* descr, IRAtom* ix, Int bias ) |
| 717 | { |
| 718 | IRType ty = descr->elemTy; |
| 719 | IRType tyS = shadowType(ty); |
| 720 | Int arrSize = descr->nElems * sizeofIRType(ty); |
| 721 | tl_assert(ty != Ity_I1); |
| 722 | tl_assert(isOriginalAtom(mce,ix)); |
| 723 | complainIfUndefined(mce,ix); |
| 724 | if (isAlwaysDefd(mce, descr->base, arrSize)) { |
| 725 | /* Always defined, return all zeroes of the relevant type */ |
| 726 | return definedOfType(tyS); |
| 727 | } else { |
| 728 | /* return a cloned version of the Get that refers to the shadow |
| 729 | area. */ |
| 730 | IRArray* new_descr |
| 731 | = mkIRArray( descr->base + mce->layout->total_sizeB, |
| 732 | tyS, descr->nElems); |
| 733 | return IRExpr_GetI( new_descr, ix, bias ); |
| 734 | } |
| 735 | } |
| 736 | |
| 737 | |
| 738 | /*------------------------------------------------------------*/ |
| 739 | /*--- Generating approximations for unknown operations, ---*/ |
| 740 | /*--- using lazy-propagate semantics ---*/ |
| 741 | /*------------------------------------------------------------*/ |
| 742 | |
| 743 | /* Lazy propagation of undefinedness from two values, resulting in the |
| 744 | specified shadow type. |
| 745 | */ |
| 746 | static |
| 747 | IRAtom* mkLazy2 ( MCEnv* mce, IRType finalVty, IRAtom* va1, IRAtom* va2 ) |
| 748 | { |
| 749 | /* force everything via 32-bit intermediaries. */ |
| 750 | IRAtom* at; |
| 751 | tl_assert(isShadowAtom(mce,va1)); |
| 752 | tl_assert(isShadowAtom(mce,va2)); |
| 753 | at = mkPCastTo(mce, Ity_I32, va1); |
| 754 | at = mkUifU(mce, Ity_I32, at, mkPCastTo(mce, Ity_I32, va2)); |
| 755 | at = mkPCastTo(mce, finalVty, at); |
| 756 | return at; |
| 757 | } |
| 758 | |
| 759 | |
| 760 | /* Do the lazy propagation game from a null-terminated vector of |
| 761 | atoms. This is presumably the arguments to a helper call, so the |
| 762 | IRCallee info is also supplied in order that we can know which |
| 763 | arguments should be ignored (via the .mcx_mask field). |
| 764 | */ |
| 765 | static |
| 766 | IRAtom* mkLazyN ( MCEnv* mce, |
| 767 | IRAtom** exprvec, IRType finalVtype, IRCallee* cee ) |
| 768 | { |
| 769 | Int i; |
| 770 | IRAtom* here; |
| 771 | IRAtom* curr = definedOfType(Ity_I32); |
| 772 | for (i = 0; exprvec[i]; i++) { |
| 773 | tl_assert(i < 32); |
| 774 | tl_assert(isOriginalAtom(mce, exprvec[i])); |
| 775 | /* Only take notice of this arg if the callee's mc-exclusion |
| 776 | mask does not say it is to be excluded. */ |
| 777 | if (cee->mcx_mask & (1<<i)) { |
| 778 | /* the arg is to be excluded from definedness checking. Do |
| 779 | nothing. */ |
| 780 | if (0) VG_(printf)("excluding %s(%d)\n", cee->name, i); |
| 781 | } else { |
| 782 | /* calculate the arg's definedness, and pessimistically merge |
| 783 | it in. */ |
| 784 | here = mkPCastTo( mce, Ity_I32, expr2vbits(mce, exprvec[i]) ); |
| 785 | curr = mkUifU32(mce, here, curr); |
| 786 | } |
| 787 | } |
| 788 | return mkPCastTo(mce, finalVtype, curr ); |
| 789 | } |
| 790 | |
| 791 | |
| 792 | /*------------------------------------------------------------*/ |
| 793 | /*--- Generating expensive sequences for exact carry-chain ---*/ |
| 794 | /*--- propagation in add/sub and related operations. ---*/ |
| 795 | /*------------------------------------------------------------*/ |
| 796 | |
| 797 | static |
| 798 | IRAtom* expensiveAdd32 ( MCEnv* mce, IRAtom* qaa, IRAtom* qbb, |
| 799 | IRAtom* aa, IRAtom* bb ) |
| 800 | { |
sewardj | 7cf97ee | 2004-11-28 14:25:01 +0000 | [diff] [blame] | 801 | IRAtom *a_min, *b_min, *a_max, *b_max; |
| 802 | IRType ty; |
| 803 | IROp opAND, opOR, opXOR, opNOT, opADD; |
| 804 | |
sewardj | 9544807 | 2004-11-22 20:19:51 +0000 | [diff] [blame] | 805 | tl_assert(isShadowAtom(mce,qaa)); |
| 806 | tl_assert(isShadowAtom(mce,qbb)); |
| 807 | tl_assert(isOriginalAtom(mce,aa)); |
| 808 | tl_assert(isOriginalAtom(mce,bb)); |
| 809 | tl_assert(sameKindedAtoms(qaa,aa)); |
| 810 | tl_assert(sameKindedAtoms(qbb,bb)); |
| 811 | |
sewardj | 7cf97ee | 2004-11-28 14:25:01 +0000 | [diff] [blame] | 812 | ty = Ity_I32; |
| 813 | opAND = Iop_And32; |
| 814 | opOR = Iop_Or32; |
| 815 | opXOR = Iop_Xor32; |
| 816 | opNOT = Iop_Not32; |
| 817 | opADD = Iop_Add32; |
sewardj | 9544807 | 2004-11-22 20:19:51 +0000 | [diff] [blame] | 818 | |
| 819 | // a_min = aa & ~qaa |
| 820 | a_min = assignNew(mce,ty, |
| 821 | binop(opAND, aa, |
| 822 | assignNew(mce,ty, unop(opNOT, qaa)))); |
| 823 | |
| 824 | // b_min = bb & ~qbb |
| 825 | b_min = assignNew(mce,ty, |
| 826 | binop(opAND, bb, |
| 827 | assignNew(mce,ty, unop(opNOT, qbb)))); |
| 828 | |
| 829 | // a_max = aa | qaa |
| 830 | a_max = assignNew(mce,ty, binop(opOR, aa, qaa)); |
| 831 | |
| 832 | // b_max = bb | qbb |
| 833 | b_max = assignNew(mce,ty, binop(opOR, bb, qbb)); |
| 834 | |
| 835 | // result = (qaa | qbb) | ((a_min + b_min) ^ (a_max + b_max)) |
| 836 | return |
| 837 | assignNew(mce,ty, |
| 838 | binop( opOR, |
| 839 | assignNew(mce,ty, binop(opOR, qaa, qbb)), |
| 840 | assignNew(mce,ty, |
| 841 | binop(opXOR, assignNew(mce,ty, binop(opADD, a_min, b_min)), |
| 842 | assignNew(mce,ty, binop(opADD, a_max, b_max)) |
| 843 | ) |
| 844 | ) |
| 845 | ) |
| 846 | ); |
| 847 | } |
| 848 | |
| 849 | |
| 850 | /*------------------------------------------------------------*/ |
sewardj | 3245c91 | 2004-12-10 14:58:26 +0000 | [diff] [blame^] | 851 | /*--- Helpers for dealing with vector primops. ---*/ |
| 852 | /*------------------------------------------------------------*/ |
| 853 | |
| 854 | /* Here's a simple scheme capable of handling ops derived from SSE1 |
| 855 | code and while only generating ops that can be efficiently |
| 856 | implemented in SSE1. */ |
| 857 | |
| 858 | /* All-lanes versions are straightforward: |
| 859 | |
| 860 | binary32Fx4(x,y) ==> PCast32x4(UifU128(x#,y#)) |
| 861 | |
| 862 | unary32Fx4(x,y) ==> PCast32x4(x#) |
| 863 | |
| 864 | Lowest-lane-only versions are more complex: |
| 865 | |
| 866 | binary32F0x4(x,y) ==> Set128lo32( |
| 867 | x#, |
| 868 | PCast32(128to32(UifU128(x#,y#))) |
| 869 | ) |
| 870 | |
| 871 | This is perhaps not so obvious. In particular, it's faster to |
| 872 | do a 128-bit UifU and then take the bottom 32 bits than the more |
| 873 | obvious scheme of taking the bottom 32 bits of each operand |
| 874 | and doing a 32-bit UifU. Basically since UifU is fast and |
| 875 | chopping lanes off vector values is slow. |
| 876 | |
| 877 | Finally: |
| 878 | |
| 879 | unary32F0x4(x) ==> Set128lo32( |
| 880 | x#, |
| 881 | PCast32(128to32(x#)) |
| 882 | ) |
| 883 | |
| 884 | Where: |
| 885 | |
| 886 | PCast32(v#) = 1Sto32(CmpNE32(v#,0)) |
| 887 | PCast32x4(v#) = CmpNEZ32x4(v#) |
| 888 | */ |
| 889 | |
| 890 | static |
| 891 | IRAtom* binary32Fx4 ( MCEnv* mce, IRAtom* vatomX, IRAtom* vatomY ) |
| 892 | { |
| 893 | IRAtom* at; |
| 894 | tl_assert(isShadowAtom(mce, vatomX)); |
| 895 | tl_assert(isShadowAtom(mce, vatomY)); |
| 896 | at = mkUifU128(mce, vatomX, vatomY); |
| 897 | at = assignNew(mce, Ity_V128, unop(Iop_CmpNEZ32x4, at)); |
| 898 | return at; |
| 899 | } |
| 900 | |
| 901 | static |
| 902 | IRAtom* unary32Fx4 ( MCEnv* mce, IRAtom* vatomX ) |
| 903 | { |
| 904 | IRAtom* at; |
| 905 | tl_assert(isShadowAtom(mce, vatomX)); |
| 906 | at = assignNew(mce, Ity_V128, unop(Iop_CmpNEZ32x4, vatomX)); |
| 907 | return at; |
| 908 | } |
| 909 | |
| 910 | static |
| 911 | IRAtom* binary32F0x4 ( MCEnv* mce, IRAtom* vatomX, IRAtom* vatomY ) |
| 912 | { |
| 913 | IRAtom* at; |
| 914 | tl_assert(isShadowAtom(mce, vatomX)); |
| 915 | tl_assert(isShadowAtom(mce, vatomY)); |
| 916 | at = mkUifU128(mce, vatomX, vatomY); |
| 917 | at = assignNew(mce, Ity_I32, unop(Iop_128to32, at)); |
| 918 | at = mkPCastTo(mce, Ity_I32, at); |
| 919 | at = assignNew(mce, Ity_V128, binop(Iop_Set128lo32, vatomX, at)); |
| 920 | return at; |
| 921 | } |
| 922 | |
| 923 | static |
| 924 | IRAtom* unary32F0x4 ( MCEnv* mce, IRAtom* vatomX ) |
| 925 | { |
| 926 | IRAtom* at; |
| 927 | tl_assert(isShadowAtom(mce, vatomX)); |
| 928 | at = assignNew(mce, Ity_I32, unop(Iop_128to32, vatomX)); |
| 929 | at = mkPCastTo(mce, Ity_I32, at); |
| 930 | at = assignNew(mce, Ity_V128, binop(Iop_Set128lo32, vatomX, at)); |
| 931 | return at; |
| 932 | } |
| 933 | |
| 934 | |
| 935 | |
| 936 | /*------------------------------------------------------------*/ |
sewardj | 9544807 | 2004-11-22 20:19:51 +0000 | [diff] [blame] | 937 | /*--- Generate shadow values from all kinds of IRExprs. ---*/ |
| 938 | /*------------------------------------------------------------*/ |
| 939 | |
| 940 | static |
| 941 | IRAtom* expr2vbits_Binop ( MCEnv* mce, |
| 942 | IROp op, |
| 943 | IRAtom* atom1, IRAtom* atom2 ) |
| 944 | { |
| 945 | IRType and_or_ty; |
| 946 | IRAtom* (*uifu) (MCEnv*, IRAtom*, IRAtom*); |
| 947 | IRAtom* (*difd) (MCEnv*, IRAtom*, IRAtom*); |
| 948 | IRAtom* (*improve) (MCEnv*, IRAtom*, IRAtom*); |
| 949 | |
| 950 | IRAtom* vatom1 = expr2vbits( mce, atom1 ); |
| 951 | IRAtom* vatom2 = expr2vbits( mce, atom2 ); |
| 952 | |
| 953 | tl_assert(isOriginalAtom(mce,atom1)); |
| 954 | tl_assert(isOriginalAtom(mce,atom2)); |
| 955 | tl_assert(isShadowAtom(mce,vatom1)); |
| 956 | tl_assert(isShadowAtom(mce,vatom2)); |
| 957 | tl_assert(sameKindedAtoms(atom1,vatom1)); |
| 958 | tl_assert(sameKindedAtoms(atom2,vatom2)); |
| 959 | switch (op) { |
| 960 | |
sewardj | 3245c91 | 2004-12-10 14:58:26 +0000 | [diff] [blame^] | 961 | /* 128-bit SIMD */ |
| 962 | |
| 963 | case Iop_Add32Fx4: |
| 964 | return binary32Fx4(mce, vatom1, vatom2); |
| 965 | |
| 966 | /* Scalar floating point */ |
| 967 | |
sewardj | 9544807 | 2004-11-22 20:19:51 +0000 | [diff] [blame] | 968 | case Iop_RoundF64: |
| 969 | case Iop_F64toI64: |
sewardj | e9e16d3 | 2004-12-10 13:17:55 +0000 | [diff] [blame] | 970 | case Iop_I64toF64: |
| 971 | /* First arg is I32 (rounding mode), second is F64 or I64 |
| 972 | (data). */ |
sewardj | 9544807 | 2004-11-22 20:19:51 +0000 | [diff] [blame] | 973 | return mkLazy2(mce, Ity_I64, vatom1, vatom2); |
| 974 | |
| 975 | case Iop_PRemC3210F64: case Iop_PRem1C3210F64: |
| 976 | /* Takes two F64 args. */ |
| 977 | case Iop_F64toI32: |
sewardj | e9e16d3 | 2004-12-10 13:17:55 +0000 | [diff] [blame] | 978 | case Iop_F64toF32: |
sewardj | 9544807 | 2004-11-22 20:19:51 +0000 | [diff] [blame] | 979 | /* First arg is I32 (rounding mode), second is F64 (data). */ |
| 980 | return mkLazy2(mce, Ity_I32, vatom1, vatom2); |
| 981 | |
| 982 | case Iop_F64toI16: |
| 983 | /* First arg is I32 (rounding mode), second is F64 (data). */ |
| 984 | return mkLazy2(mce, Ity_I16, vatom1, vatom2); |
| 985 | |
| 986 | case Iop_ScaleF64: |
| 987 | case Iop_Yl2xF64: |
| 988 | case Iop_Yl2xp1F64: |
| 989 | case Iop_PRemF64: |
| 990 | case Iop_AtanF64: |
| 991 | case Iop_AddF64: |
| 992 | case Iop_DivF64: |
| 993 | case Iop_SubF64: |
| 994 | case Iop_MulF64: |
| 995 | return mkLazy2(mce, Ity_I64, vatom1, vatom2); |
| 996 | |
| 997 | case Iop_CmpF64: |
| 998 | return mkLazy2(mce, Ity_I32, vatom1, vatom2); |
| 999 | |
| 1000 | /* non-FP after here */ |
| 1001 | |
| 1002 | case Iop_DivModU64to32: |
| 1003 | case Iop_DivModS64to32: |
| 1004 | return mkLazy2(mce, Ity_I64, vatom1, vatom2); |
| 1005 | |
| 1006 | case Iop_16HLto32: |
| 1007 | return assignNew(mce, Ity_I32, |
| 1008 | binop(Iop_16HLto32, vatom1, vatom2)); |
| 1009 | case Iop_32HLto64: |
| 1010 | return assignNew(mce, Ity_I64, |
| 1011 | binop(Iop_32HLto64, vatom1, vatom2)); |
| 1012 | |
| 1013 | case Iop_MullS32: |
| 1014 | case Iop_MullU32: { |
| 1015 | IRAtom* vLo32 = mkLeft32(mce, mkUifU32(mce, vatom1,vatom2)); |
| 1016 | IRAtom* vHi32 = mkPCastTo(mce, Ity_I32, vLo32); |
| 1017 | return assignNew(mce, Ity_I64, binop(Iop_32HLto64, vHi32, vLo32)); |
| 1018 | } |
| 1019 | |
| 1020 | case Iop_MullS16: |
| 1021 | case Iop_MullU16: { |
| 1022 | IRAtom* vLo16 = mkLeft16(mce, mkUifU16(mce, vatom1,vatom2)); |
| 1023 | IRAtom* vHi16 = mkPCastTo(mce, Ity_I16, vLo16); |
| 1024 | return assignNew(mce, Ity_I32, binop(Iop_16HLto32, vHi16, vLo16)); |
| 1025 | } |
| 1026 | |
| 1027 | case Iop_MullS8: |
| 1028 | case Iop_MullU8: { |
| 1029 | IRAtom* vLo8 = mkLeft8(mce, mkUifU8(mce, vatom1,vatom2)); |
| 1030 | IRAtom* vHi8 = mkPCastTo(mce, Ity_I8, vLo8); |
| 1031 | return assignNew(mce, Ity_I16, binop(Iop_8HLto16, vHi8, vLo8)); |
| 1032 | } |
| 1033 | |
| 1034 | case Iop_Add32: |
| 1035 | # if 0 |
| 1036 | return expensiveAdd32(mce, vatom1,vatom2, atom1,atom2); |
| 1037 | # endif |
| 1038 | case Iop_Sub32: |
| 1039 | case Iop_Mul32: |
| 1040 | return mkLeft32(mce, mkUifU32(mce, vatom1,vatom2)); |
| 1041 | |
| 1042 | case Iop_Mul16: |
| 1043 | case Iop_Add16: |
| 1044 | case Iop_Sub16: |
| 1045 | return mkLeft16(mce, mkUifU16(mce, vatom1,vatom2)); |
| 1046 | |
| 1047 | case Iop_Sub8: |
| 1048 | case Iop_Add8: |
| 1049 | return mkLeft8(mce, mkUifU8(mce, vatom1,vatom2)); |
| 1050 | |
| 1051 | case Iop_CmpLE32S: case Iop_CmpLE32U: |
| 1052 | case Iop_CmpLT32U: case Iop_CmpLT32S: |
| 1053 | case Iop_CmpEQ32: case Iop_CmpNE32: |
| 1054 | return mkPCastTo(mce, Ity_I1, mkUifU32(mce, vatom1,vatom2)); |
| 1055 | |
| 1056 | case Iop_CmpEQ16: case Iop_CmpNE16: |
| 1057 | return mkPCastTo(mce, Ity_I1, mkUifU16(mce, vatom1,vatom2)); |
| 1058 | |
| 1059 | case Iop_CmpEQ8: case Iop_CmpNE8: |
| 1060 | return mkPCastTo(mce, Ity_I1, mkUifU8(mce, vatom1,vatom2)); |
| 1061 | |
| 1062 | case Iop_Shl32: case Iop_Shr32: case Iop_Sar32: |
| 1063 | /* Complain if the shift amount is undefined. Then simply |
| 1064 | shift the first arg's V bits by the real shift amount. */ |
| 1065 | complainIfUndefined(mce, atom2); |
| 1066 | return assignNew(mce, Ity_I32, binop(op, vatom1, atom2)); |
| 1067 | |
| 1068 | case Iop_Shl16: case Iop_Shr16: |
| 1069 | /* Same scheme as with 32-bit shifts. */ |
| 1070 | complainIfUndefined(mce, atom2); |
| 1071 | return assignNew(mce, Ity_I16, binop(op, vatom1, atom2)); |
| 1072 | |
| 1073 | case Iop_Shl8: case Iop_Shr8: |
| 1074 | /* Same scheme as with 32-bit shifts. */ |
| 1075 | complainIfUndefined(mce, atom2); |
| 1076 | return assignNew(mce, Ity_I8, binop(op, vatom1, atom2)); |
| 1077 | |
| 1078 | case Iop_Shl64: case Iop_Shr64: |
| 1079 | /* Same scheme as with 32-bit shifts. */ |
| 1080 | complainIfUndefined(mce, atom2); |
| 1081 | return assignNew(mce, Ity_I64, binop(op, vatom1, atom2)); |
| 1082 | |
sewardj | 7010f6e | 2004-12-10 13:35:22 +0000 | [diff] [blame] | 1083 | case Iop_And64: |
| 1084 | uifu = mkUifU64; difd = mkDifD64; |
| 1085 | and_or_ty = Ity_I64; improve = mkImproveAND64; goto do_And_Or; |
sewardj | 9544807 | 2004-11-22 20:19:51 +0000 | [diff] [blame] | 1086 | case Iop_And32: |
| 1087 | uifu = mkUifU32; difd = mkDifD32; |
| 1088 | and_or_ty = Ity_I32; improve = mkImproveAND32; goto do_And_Or; |
| 1089 | case Iop_And16: |
| 1090 | uifu = mkUifU16; difd = mkDifD16; |
| 1091 | and_or_ty = Ity_I16; improve = mkImproveAND16; goto do_And_Or; |
| 1092 | case Iop_And8: |
| 1093 | uifu = mkUifU8; difd = mkDifD8; |
| 1094 | and_or_ty = Ity_I8; improve = mkImproveAND8; goto do_And_Or; |
| 1095 | |
sewardj | 7010f6e | 2004-12-10 13:35:22 +0000 | [diff] [blame] | 1096 | case Iop_Or64: |
| 1097 | uifu = mkUifU64; difd = mkDifD64; |
| 1098 | and_or_ty = Ity_I64; improve = mkImproveOR64; goto do_And_Or; |
sewardj | 9544807 | 2004-11-22 20:19:51 +0000 | [diff] [blame] | 1099 | case Iop_Or32: |
| 1100 | uifu = mkUifU32; difd = mkDifD32; |
| 1101 | and_or_ty = Ity_I32; improve = mkImproveOR32; goto do_And_Or; |
| 1102 | case Iop_Or16: |
| 1103 | uifu = mkUifU16; difd = mkDifD16; |
| 1104 | and_or_ty = Ity_I16; improve = mkImproveOR16; goto do_And_Or; |
| 1105 | case Iop_Or8: |
| 1106 | uifu = mkUifU8; difd = mkDifD8; |
| 1107 | and_or_ty = Ity_I8; improve = mkImproveOR8; goto do_And_Or; |
| 1108 | |
| 1109 | do_And_Or: |
| 1110 | return |
| 1111 | assignNew( |
| 1112 | mce, |
| 1113 | and_or_ty, |
| 1114 | difd(mce, uifu(mce, vatom1, vatom2), |
| 1115 | difd(mce, improve(mce, atom1, vatom1), |
| 1116 | improve(mce, atom2, vatom2) ) ) ); |
| 1117 | |
| 1118 | case Iop_Xor8: |
| 1119 | return mkUifU8(mce, vatom1, vatom2); |
| 1120 | case Iop_Xor16: |
| 1121 | return mkUifU16(mce, vatom1, vatom2); |
| 1122 | case Iop_Xor32: |
| 1123 | return mkUifU32(mce, vatom1, vatom2); |
sewardj | 7010f6e | 2004-12-10 13:35:22 +0000 | [diff] [blame] | 1124 | case Iop_Xor64: |
| 1125 | return mkUifU64(mce, vatom1, vatom2); |
njn25 | e49d8e7 | 2002-09-23 09:36:25 +0000 | [diff] [blame] | 1126 | |
| 1127 | default: |
sewardj | 9544807 | 2004-11-22 20:19:51 +0000 | [diff] [blame] | 1128 | ppIROp(op); |
| 1129 | VG_(tool_panic)("memcheck:expr2vbits_Binop"); |
njn25 | e49d8e7 | 2002-09-23 09:36:25 +0000 | [diff] [blame] | 1130 | } |
njn25 | e49d8e7 | 2002-09-23 09:36:25 +0000 | [diff] [blame] | 1131 | } |
| 1132 | |
njn25 | e49d8e7 | 2002-09-23 09:36:25 +0000 | [diff] [blame] | 1133 | |
sewardj | 9544807 | 2004-11-22 20:19:51 +0000 | [diff] [blame] | 1134 | static |
| 1135 | IRExpr* expr2vbits_Unop ( MCEnv* mce, IROp op, IRAtom* atom ) |
| 1136 | { |
| 1137 | IRAtom* vatom = expr2vbits( mce, atom ); |
| 1138 | tl_assert(isOriginalAtom(mce,atom)); |
| 1139 | switch (op) { |
| 1140 | |
| 1141 | case Iop_F32toF64: |
| 1142 | case Iop_I32toF64: |
sewardj | 9544807 | 2004-11-22 20:19:51 +0000 | [diff] [blame] | 1143 | case Iop_NegF64: |
| 1144 | case Iop_SinF64: |
| 1145 | case Iop_CosF64: |
| 1146 | case Iop_TanF64: |
| 1147 | case Iop_SqrtF64: |
| 1148 | case Iop_AbsF64: |
| 1149 | case Iop_2xm1F64: |
| 1150 | return mkPCastTo(mce, Ity_I64, vatom); |
| 1151 | |
sewardj | 9544807 | 2004-11-22 20:19:51 +0000 | [diff] [blame] | 1152 | case Iop_Clz32: |
| 1153 | case Iop_Ctz32: |
| 1154 | return mkPCastTo(mce, Ity_I32, vatom); |
| 1155 | |
| 1156 | case Iop_32Sto64: |
| 1157 | case Iop_32Uto64: |
| 1158 | return assignNew(mce, Ity_I64, unop(op, vatom)); |
| 1159 | |
| 1160 | case Iop_64to32: |
| 1161 | case Iop_64HIto32: |
| 1162 | case Iop_1Uto32: |
| 1163 | case Iop_8Uto32: |
| 1164 | case Iop_16Uto32: |
| 1165 | case Iop_16Sto32: |
| 1166 | case Iop_8Sto32: |
| 1167 | return assignNew(mce, Ity_I32, unop(op, vatom)); |
| 1168 | |
| 1169 | case Iop_8Sto16: |
| 1170 | case Iop_8Uto16: |
| 1171 | case Iop_32to16: |
| 1172 | case Iop_32HIto16: |
| 1173 | return assignNew(mce, Ity_I16, unop(op, vatom)); |
| 1174 | |
| 1175 | case Iop_1Uto8: |
| 1176 | case Iop_16to8: |
| 1177 | case Iop_32to8: |
| 1178 | return assignNew(mce, Ity_I8, unop(op, vatom)); |
| 1179 | |
| 1180 | case Iop_32to1: |
| 1181 | return assignNew(mce, Ity_I1, unop(Iop_32to1, vatom)); |
| 1182 | |
| 1183 | case Iop_ReinterpF64asI64: |
| 1184 | case Iop_ReinterpI64asF64: |
sewardj | 7010f6e | 2004-12-10 13:35:22 +0000 | [diff] [blame] | 1185 | case Iop_Not64: |
sewardj | 9544807 | 2004-11-22 20:19:51 +0000 | [diff] [blame] | 1186 | case Iop_Not32: |
| 1187 | case Iop_Not16: |
| 1188 | case Iop_Not8: |
| 1189 | case Iop_Not1: |
| 1190 | return vatom; |
sewardj | 7010f6e | 2004-12-10 13:35:22 +0000 | [diff] [blame] | 1191 | |
sewardj | 9544807 | 2004-11-22 20:19:51 +0000 | [diff] [blame] | 1192 | default: |
| 1193 | ppIROp(op); |
| 1194 | VG_(tool_panic)("memcheck:expr2vbits_Unop"); |
| 1195 | } |
| 1196 | } |
| 1197 | |
| 1198 | |
| 1199 | static |
| 1200 | IRAtom* expr2vbits_LDle ( MCEnv* mce, IRType ty, IRAtom* addr, UInt bias ) |
| 1201 | { |
| 1202 | void* helper; |
| 1203 | Char* hname; |
| 1204 | IRDirty* di; |
| 1205 | IRTemp datavbits; |
| 1206 | IRAtom* addrAct; |
| 1207 | |
| 1208 | tl_assert(isOriginalAtom(mce,addr)); |
| 1209 | |
| 1210 | /* First, emit a definedness test for the address. This also sets |
| 1211 | the address (shadow) to 'defined' following the test. */ |
| 1212 | complainIfUndefined( mce, addr ); |
| 1213 | |
| 1214 | /* Now cook up a call to the relevant helper function, to read the |
| 1215 | data V bits from shadow memory. */ |
| 1216 | ty = shadowType(ty); |
| 1217 | switch (ty) { |
| 1218 | case Ity_I64: helper = &MC_(helperc_LOADV8); |
| 1219 | hname = "MC_(helperc_LOADV8)"; |
| 1220 | break; |
| 1221 | case Ity_I32: helper = &MC_(helperc_LOADV4); |
| 1222 | hname = "MC_(helperc_LOADV4)"; |
| 1223 | break; |
| 1224 | case Ity_I16: helper = &MC_(helperc_LOADV2); |
| 1225 | hname = "MC_(helperc_LOADV2)"; |
| 1226 | break; |
| 1227 | case Ity_I8: helper = &MC_(helperc_LOADV1); |
| 1228 | hname = "MC_(helperc_LOADV1)"; |
| 1229 | break; |
| 1230 | default: ppIRType(ty); |
| 1231 | VG_(tool_panic)("memcheck:do_shadow_LDle"); |
| 1232 | } |
| 1233 | |
| 1234 | /* Generate the actual address into addrAct. */ |
| 1235 | if (bias == 0) { |
| 1236 | addrAct = addr; |
| 1237 | } else { |
sewardj | 7cf97ee | 2004-11-28 14:25:01 +0000 | [diff] [blame] | 1238 | IROp mkAdd; |
| 1239 | IRAtom* eBias; |
sewardj | 9544807 | 2004-11-22 20:19:51 +0000 | [diff] [blame] | 1240 | IRType tyAddr = mce->hWordTy; |
| 1241 | tl_assert( tyAddr == Ity_I32 || tyAddr == Ity_I64 ); |
sewardj | 7cf97ee | 2004-11-28 14:25:01 +0000 | [diff] [blame] | 1242 | mkAdd = tyAddr==Ity_I32 ? Iop_Add32 : Iop_Add64; |
| 1243 | eBias = tyAddr==Ity_I32 ? mkU32(bias) : mkU64(bias); |
sewardj | 9544807 | 2004-11-22 20:19:51 +0000 | [diff] [blame] | 1244 | addrAct = assignNew(mce, tyAddr, binop(mkAdd, addr, eBias) ); |
| 1245 | } |
| 1246 | |
| 1247 | /* We need to have a place to park the V bits we're just about to |
| 1248 | read. */ |
| 1249 | datavbits = newIRTemp(mce->bb->tyenv, ty); |
| 1250 | di = unsafeIRDirty_1_N( datavbits, |
| 1251 | 1/*regparms*/, hname, helper, |
| 1252 | mkIRExprVec_1( addrAct )); |
| 1253 | setHelperAnns( mce, di ); |
| 1254 | stmt( mce->bb, IRStmt_Dirty(di) ); |
| 1255 | |
| 1256 | return mkexpr(datavbits); |
| 1257 | } |
| 1258 | |
| 1259 | |
| 1260 | static |
| 1261 | IRAtom* expr2vbits_Mux0X ( MCEnv* mce, |
| 1262 | IRAtom* cond, IRAtom* expr0, IRAtom* exprX ) |
| 1263 | { |
| 1264 | IRAtom *vbitsC, *vbits0, *vbitsX; |
| 1265 | IRType ty; |
| 1266 | /* Given Mux0X(cond,expr0,exprX), generate |
| 1267 | Mux0X(cond,expr0#,exprX#) `UifU` PCast(cond#) |
| 1268 | That is, steer the V bits like the originals, but trash the |
| 1269 | result if the steering value is undefined. This gives |
| 1270 | lazy propagation. */ |
| 1271 | tl_assert(isOriginalAtom(mce, cond)); |
| 1272 | tl_assert(isOriginalAtom(mce, expr0)); |
| 1273 | tl_assert(isOriginalAtom(mce, exprX)); |
| 1274 | |
| 1275 | vbitsC = expr2vbits(mce, cond); |
| 1276 | vbits0 = expr2vbits(mce, expr0); |
| 1277 | vbitsX = expr2vbits(mce, exprX); |
| 1278 | ty = typeOfIRExpr(mce->bb->tyenv, vbits0); |
| 1279 | |
| 1280 | return |
| 1281 | mkUifU(mce, ty, assignNew(mce, ty, IRExpr_Mux0X(cond, vbits0, vbitsX)), |
| 1282 | mkPCastTo(mce, ty, vbitsC) ); |
| 1283 | } |
| 1284 | |
| 1285 | /* --------- This is the main expression-handling function. --------- */ |
| 1286 | |
| 1287 | static |
| 1288 | IRExpr* expr2vbits ( MCEnv* mce, IRExpr* e ) |
| 1289 | { |
| 1290 | switch (e->tag) { |
| 1291 | |
| 1292 | case Iex_Get: |
| 1293 | return shadow_GET( mce, e->Iex.Get.offset, e->Iex.Get.ty ); |
| 1294 | |
| 1295 | case Iex_GetI: |
| 1296 | return shadow_GETI( mce, e->Iex.GetI.descr, |
| 1297 | e->Iex.GetI.ix, e->Iex.GetI.bias ); |
| 1298 | |
| 1299 | case Iex_Tmp: |
| 1300 | return IRExpr_Tmp( findShadowTmp(mce, e->Iex.Tmp.tmp) ); |
| 1301 | |
| 1302 | case Iex_Const: |
| 1303 | return definedOfType(shadowType(typeOfIRExpr(mce->bb->tyenv, e))); |
| 1304 | |
| 1305 | case Iex_Binop: |
| 1306 | return expr2vbits_Binop( |
| 1307 | mce, |
| 1308 | e->Iex.Binop.op, |
| 1309 | e->Iex.Binop.arg1, e->Iex.Binop.arg2 |
| 1310 | ); |
| 1311 | |
| 1312 | case Iex_Unop: |
| 1313 | return expr2vbits_Unop( mce, e->Iex.Unop.op, e->Iex.Unop.arg ); |
| 1314 | |
| 1315 | case Iex_LDle: |
| 1316 | return expr2vbits_LDle( mce, e->Iex.LDle.ty, |
| 1317 | e->Iex.LDle.addr, 0/*addr bias*/ ); |
| 1318 | |
| 1319 | case Iex_CCall: |
| 1320 | return mkLazyN( mce, e->Iex.CCall.args, |
| 1321 | e->Iex.CCall.retty, |
| 1322 | e->Iex.CCall.cee ); |
| 1323 | |
| 1324 | case Iex_Mux0X: |
| 1325 | return expr2vbits_Mux0X( mce, e->Iex.Mux0X.cond, e->Iex.Mux0X.expr0, |
| 1326 | e->Iex.Mux0X.exprX); |
njn25 | e49d8e7 | 2002-09-23 09:36:25 +0000 | [diff] [blame] | 1327 | |
| 1328 | default: |
sewardj | 9544807 | 2004-11-22 20:19:51 +0000 | [diff] [blame] | 1329 | VG_(printf)("\n"); |
| 1330 | ppIRExpr(e); |
| 1331 | VG_(printf)("\n"); |
| 1332 | VG_(tool_panic)("memcheck: expr2vbits"); |
njn25 | e49d8e7 | 2002-09-23 09:36:25 +0000 | [diff] [blame] | 1333 | } |
njn25 | e49d8e7 | 2002-09-23 09:36:25 +0000 | [diff] [blame] | 1334 | } |
| 1335 | |
| 1336 | /*------------------------------------------------------------*/ |
sewardj | 9544807 | 2004-11-22 20:19:51 +0000 | [diff] [blame] | 1337 | /*--- Generate shadow stmts from all kinds of IRStmts. ---*/ |
njn25 | e49d8e7 | 2002-09-23 09:36:25 +0000 | [diff] [blame] | 1338 | /*------------------------------------------------------------*/ |
| 1339 | |
sewardj | 9544807 | 2004-11-22 20:19:51 +0000 | [diff] [blame] | 1340 | /* Widen a value to the host word size. */ |
njn25 | e49d8e7 | 2002-09-23 09:36:25 +0000 | [diff] [blame] | 1341 | |
| 1342 | static |
sewardj | 9544807 | 2004-11-22 20:19:51 +0000 | [diff] [blame] | 1343 | IRExpr* zwidenToHostWord ( MCEnv* mce, IRAtom* vatom ) |
njn25 | e49d8e7 | 2002-09-23 09:36:25 +0000 | [diff] [blame] | 1344 | { |
sewardj | 7cf97ee | 2004-11-28 14:25:01 +0000 | [diff] [blame] | 1345 | IRType ty, tyH; |
| 1346 | |
sewardj | 9544807 | 2004-11-22 20:19:51 +0000 | [diff] [blame] | 1347 | /* vatom is vbits-value and as such can only have a shadow type. */ |
| 1348 | tl_assert(isShadowAtom(mce,vatom)); |
njn25 | e49d8e7 | 2002-09-23 09:36:25 +0000 | [diff] [blame] | 1349 | |
sewardj | 7cf97ee | 2004-11-28 14:25:01 +0000 | [diff] [blame] | 1350 | ty = typeOfIRExpr(mce->bb->tyenv, vatom); |
| 1351 | tyH = mce->hWordTy; |
njn25 | e49d8e7 | 2002-09-23 09:36:25 +0000 | [diff] [blame] | 1352 | |
sewardj | 9544807 | 2004-11-22 20:19:51 +0000 | [diff] [blame] | 1353 | if (tyH == Ity_I32) { |
| 1354 | switch (ty) { |
| 1355 | case Ity_I32: return vatom; |
| 1356 | case Ity_I16: return assignNew(mce, tyH, unop(Iop_16Uto32, vatom)); |
| 1357 | case Ity_I8: return assignNew(mce, tyH, unop(Iop_8Uto32, vatom)); |
| 1358 | default: goto unhandled; |
sewardj | 8ec2cfc | 2002-10-13 00:57:26 +0000 | [diff] [blame] | 1359 | } |
sewardj | 9544807 | 2004-11-22 20:19:51 +0000 | [diff] [blame] | 1360 | } else { |
| 1361 | goto unhandled; |
sewardj | 8ec2cfc | 2002-10-13 00:57:26 +0000 | [diff] [blame] | 1362 | } |
sewardj | 9544807 | 2004-11-22 20:19:51 +0000 | [diff] [blame] | 1363 | unhandled: |
| 1364 | VG_(printf)("\nty = "); ppIRType(ty); VG_(printf)("\n"); |
| 1365 | VG_(tool_panic)("zwidenToHostWord"); |
njn25 | e49d8e7 | 2002-09-23 09:36:25 +0000 | [diff] [blame] | 1366 | } |
| 1367 | |
njn25 | e49d8e7 | 2002-09-23 09:36:25 +0000 | [diff] [blame] | 1368 | |
sewardj | 9544807 | 2004-11-22 20:19:51 +0000 | [diff] [blame] | 1369 | /* Generate a shadow store. addr is always the original address atom. |
| 1370 | You can pass in either originals or V-bits for the data atom, but |
| 1371 | obviously not both. */ |
njn25 | e49d8e7 | 2002-09-23 09:36:25 +0000 | [diff] [blame] | 1372 | |
sewardj | 9544807 | 2004-11-22 20:19:51 +0000 | [diff] [blame] | 1373 | static |
| 1374 | void do_shadow_STle ( MCEnv* mce, |
| 1375 | IRAtom* addr, UInt bias, |
| 1376 | IRAtom* data, IRAtom* vdata ) |
njn25 | e49d8e7 | 2002-09-23 09:36:25 +0000 | [diff] [blame] | 1377 | { |
sewardj | 9544807 | 2004-11-22 20:19:51 +0000 | [diff] [blame] | 1378 | IRType ty; |
| 1379 | IRDirty* di; |
| 1380 | void* helper = NULL; |
| 1381 | Char* hname = NULL; |
| 1382 | IRAtom* addrAct; |
njn25 | e49d8e7 | 2002-09-23 09:36:25 +0000 | [diff] [blame] | 1383 | |
sewardj | 9544807 | 2004-11-22 20:19:51 +0000 | [diff] [blame] | 1384 | if (data) { |
| 1385 | tl_assert(!vdata); |
| 1386 | tl_assert(isOriginalAtom(mce, data)); |
| 1387 | tl_assert(bias == 0); |
| 1388 | vdata = expr2vbits( mce, data ); |
| 1389 | } else { |
| 1390 | tl_assert(vdata); |
| 1391 | } |
njn25 | e49d8e7 | 2002-09-23 09:36:25 +0000 | [diff] [blame] | 1392 | |
sewardj | 9544807 | 2004-11-22 20:19:51 +0000 | [diff] [blame] | 1393 | tl_assert(isOriginalAtom(mce,addr)); |
| 1394 | tl_assert(isShadowAtom(mce,vdata)); |
njn25 | e49d8e7 | 2002-09-23 09:36:25 +0000 | [diff] [blame] | 1395 | |
sewardj | 9544807 | 2004-11-22 20:19:51 +0000 | [diff] [blame] | 1396 | ty = typeOfIRExpr(mce->bb->tyenv, vdata); |
njn25 | e49d8e7 | 2002-09-23 09:36:25 +0000 | [diff] [blame] | 1397 | |
sewardj | 9544807 | 2004-11-22 20:19:51 +0000 | [diff] [blame] | 1398 | /* First, emit a definedness test for the address. This also sets |
| 1399 | the address (shadow) to 'defined' following the test. */ |
| 1400 | complainIfUndefined( mce, addr ); |
njn25 | e49d8e7 | 2002-09-23 09:36:25 +0000 | [diff] [blame] | 1401 | |
sewardj | 9544807 | 2004-11-22 20:19:51 +0000 | [diff] [blame] | 1402 | /* Now cook up a call to the relevant helper function, to write the |
| 1403 | data V bits into shadow memory. */ |
| 1404 | switch (ty) { |
| 1405 | case Ity_I64: helper = &MC_(helperc_STOREV8); |
| 1406 | hname = "MC_(helperc_STOREV8)"; |
| 1407 | break; |
| 1408 | case Ity_I32: helper = &MC_(helperc_STOREV4); |
| 1409 | hname = "MC_(helperc_STOREV4)"; |
| 1410 | break; |
| 1411 | case Ity_I16: helper = &MC_(helperc_STOREV2); |
| 1412 | hname = "MC_(helperc_STOREV2)"; |
| 1413 | break; |
| 1414 | case Ity_I8: helper = &MC_(helperc_STOREV1); |
| 1415 | hname = "MC_(helperc_STOREV1)"; |
| 1416 | break; |
| 1417 | default: VG_(tool_panic)("memcheck:do_shadow_STle"); |
| 1418 | } |
njn25 | e49d8e7 | 2002-09-23 09:36:25 +0000 | [diff] [blame] | 1419 | |
sewardj | 9544807 | 2004-11-22 20:19:51 +0000 | [diff] [blame] | 1420 | /* Generate the actual address into addrAct. */ |
| 1421 | if (bias == 0) { |
| 1422 | addrAct = addr; |
| 1423 | } else { |
sewardj | 7cf97ee | 2004-11-28 14:25:01 +0000 | [diff] [blame] | 1424 | IROp mkAdd; |
| 1425 | IRAtom* eBias; |
sewardj | 9544807 | 2004-11-22 20:19:51 +0000 | [diff] [blame] | 1426 | IRType tyAddr = mce->hWordTy; |
| 1427 | tl_assert( tyAddr == Ity_I32 || tyAddr == Ity_I64 ); |
sewardj | 7cf97ee | 2004-11-28 14:25:01 +0000 | [diff] [blame] | 1428 | mkAdd = tyAddr==Ity_I32 ? Iop_Add32 : Iop_Add64; |
| 1429 | eBias = tyAddr==Ity_I32 ? mkU32(bias) : mkU64(bias); |
sewardj | 9544807 | 2004-11-22 20:19:51 +0000 | [diff] [blame] | 1430 | addrAct = assignNew(mce, tyAddr, binop(mkAdd, addr, eBias) ); |
| 1431 | } |
njn25 | e49d8e7 | 2002-09-23 09:36:25 +0000 | [diff] [blame] | 1432 | |
sewardj | 9544807 | 2004-11-22 20:19:51 +0000 | [diff] [blame] | 1433 | if (ty == Ity_I64) { |
| 1434 | /* We can't do this with regparm 2 on 32-bit platforms, since |
| 1435 | the back ends aren't clever enough to handle 64-bit regparm |
| 1436 | args. Therefore be different. */ |
| 1437 | di = unsafeIRDirty_0_N( |
| 1438 | 1/*regparms*/, hname, helper, |
| 1439 | mkIRExprVec_2( addrAct, vdata )); |
| 1440 | } else { |
| 1441 | di = unsafeIRDirty_0_N( |
| 1442 | 2/*regparms*/, hname, helper, |
| 1443 | mkIRExprVec_2( addrAct, |
| 1444 | zwidenToHostWord( mce, vdata ))); |
| 1445 | } |
| 1446 | setHelperAnns( mce, di ); |
| 1447 | stmt( mce->bb, IRStmt_Dirty(di) ); |
| 1448 | } |
njn25 | e49d8e7 | 2002-09-23 09:36:25 +0000 | [diff] [blame] | 1449 | |
njn25 | e49d8e7 | 2002-09-23 09:36:25 +0000 | [diff] [blame] | 1450 | |
sewardj | 9544807 | 2004-11-22 20:19:51 +0000 | [diff] [blame] | 1451 | /* Do lazy pessimistic propagation through a dirty helper call, by |
| 1452 | looking at the annotations on it. This is the most complex part of |
| 1453 | Memcheck. */ |
njn25 | e49d8e7 | 2002-09-23 09:36:25 +0000 | [diff] [blame] | 1454 | |
sewardj | 9544807 | 2004-11-22 20:19:51 +0000 | [diff] [blame] | 1455 | static IRType szToITy ( Int n ) |
| 1456 | { |
| 1457 | switch (n) { |
| 1458 | case 1: return Ity_I8; |
| 1459 | case 2: return Ity_I16; |
| 1460 | case 4: return Ity_I32; |
| 1461 | case 8: return Ity_I64; |
| 1462 | default: VG_(tool_panic)("szToITy(memcheck)"); |
| 1463 | } |
| 1464 | } |
njn25 | e49d8e7 | 2002-09-23 09:36:25 +0000 | [diff] [blame] | 1465 | |
sewardj | 9544807 | 2004-11-22 20:19:51 +0000 | [diff] [blame] | 1466 | static |
| 1467 | void do_shadow_Dirty ( MCEnv* mce, IRDirty* d ) |
| 1468 | { |
sewardj | e9e16d3 | 2004-12-10 13:17:55 +0000 | [diff] [blame] | 1469 | Int i, n, offset, toDo, gSz, gOff; |
sewardj | 7cf97ee | 2004-11-28 14:25:01 +0000 | [diff] [blame] | 1470 | IRAtom *src, *here, *curr; |
sewardj | 9544807 | 2004-11-22 20:19:51 +0000 | [diff] [blame] | 1471 | IRType tyAddr, tySrc, tyDst; |
| 1472 | IRTemp dst; |
njn25 | e49d8e7 | 2002-09-23 09:36:25 +0000 | [diff] [blame] | 1473 | |
sewardj | 9544807 | 2004-11-22 20:19:51 +0000 | [diff] [blame] | 1474 | /* First check the guard. */ |
| 1475 | complainIfUndefined(mce, d->guard); |
| 1476 | |
| 1477 | /* Now round up all inputs and PCast over them. */ |
sewardj | 7cf97ee | 2004-11-28 14:25:01 +0000 | [diff] [blame] | 1478 | curr = definedOfType(Ity_I32); |
sewardj | 9544807 | 2004-11-22 20:19:51 +0000 | [diff] [blame] | 1479 | |
| 1480 | /* Inputs: unmasked args */ |
| 1481 | for (i = 0; d->args[i]; i++) { |
| 1482 | if (d->cee->mcx_mask & (1<<i)) { |
| 1483 | /* ignore this arg */ |
njn25 | e49d8e7 | 2002-09-23 09:36:25 +0000 | [diff] [blame] | 1484 | } else { |
sewardj | 9544807 | 2004-11-22 20:19:51 +0000 | [diff] [blame] | 1485 | here = mkPCastTo( mce, Ity_I32, expr2vbits(mce, d->args[i]) ); |
| 1486 | curr = mkUifU32(mce, here, curr); |
njn25 | e49d8e7 | 2002-09-23 09:36:25 +0000 | [diff] [blame] | 1487 | } |
| 1488 | } |
sewardj | 9544807 | 2004-11-22 20:19:51 +0000 | [diff] [blame] | 1489 | |
| 1490 | /* Inputs: guest state that we read. */ |
| 1491 | for (i = 0; i < d->nFxState; i++) { |
| 1492 | tl_assert(d->fxState[i].fx != Ifx_None); |
| 1493 | if (d->fxState[i].fx == Ifx_Write) |
| 1494 | continue; |
sewardj | a720325 | 2004-11-26 19:17:47 +0000 | [diff] [blame] | 1495 | |
| 1496 | /* Ignore any sections marked as 'always defined'. */ |
| 1497 | if (isAlwaysDefd(mce, d->fxState[i].offset, d->fxState[i].size )) { |
sewardj | e9e16d3 | 2004-12-10 13:17:55 +0000 | [diff] [blame] | 1498 | if (0) |
sewardj | a720325 | 2004-11-26 19:17:47 +0000 | [diff] [blame] | 1499 | VG_(printf)("memcheck: Dirty gst: ignored off %d, sz %d\n", |
| 1500 | d->fxState[i].offset, d->fxState[i].size ); |
| 1501 | continue; |
| 1502 | } |
| 1503 | |
sewardj | 9544807 | 2004-11-22 20:19:51 +0000 | [diff] [blame] | 1504 | /* This state element is read or modified. So we need to |
sewardj | e9e16d3 | 2004-12-10 13:17:55 +0000 | [diff] [blame] | 1505 | consider it. If larger than 8 bytes, deal with it in 8-byte |
| 1506 | chunks. */ |
| 1507 | gSz = d->fxState[i].size; |
| 1508 | gOff = d->fxState[i].offset; |
| 1509 | tl_assert(gSz > 0); |
| 1510 | while (True) { |
| 1511 | if (gSz == 0) break; |
| 1512 | n = gSz <= 8 ? gSz : 8; |
| 1513 | /* update 'curr' with UifU of the state slice |
| 1514 | gOff .. gOff+n-1 */ |
| 1515 | tySrc = szToITy( n ); |
| 1516 | src = assignNew( mce, tySrc, |
| 1517 | shadow_GET(mce, gOff, tySrc ) ); |
| 1518 | here = mkPCastTo( mce, Ity_I32, src ); |
| 1519 | curr = mkUifU32(mce, here, curr); |
| 1520 | gSz -= n; |
| 1521 | gOff += n; |
| 1522 | } |
| 1523 | |
sewardj | 9544807 | 2004-11-22 20:19:51 +0000 | [diff] [blame] | 1524 | } |
| 1525 | |
| 1526 | /* Inputs: memory. First set up some info needed regardless of |
| 1527 | whether we're doing reads or writes. */ |
| 1528 | tyAddr = Ity_INVALID; |
| 1529 | |
| 1530 | if (d->mFx != Ifx_None) { |
| 1531 | /* Because we may do multiple shadow loads/stores from the same |
| 1532 | base address, it's best to do a single test of its |
| 1533 | definedness right now. Post-instrumentation optimisation |
| 1534 | should remove all but this test. */ |
| 1535 | tl_assert(d->mAddr); |
| 1536 | complainIfUndefined(mce, d->mAddr); |
| 1537 | |
| 1538 | tyAddr = typeOfIRExpr(mce->bb->tyenv, d->mAddr); |
| 1539 | tl_assert(tyAddr == Ity_I32 || tyAddr == Ity_I64); |
| 1540 | tl_assert(tyAddr == mce->hWordTy); /* not really right */ |
| 1541 | } |
| 1542 | |
| 1543 | /* Deal with memory inputs (reads or modifies) */ |
| 1544 | if (d->mFx == Ifx_Read || d->mFx == Ifx_Modify) { |
| 1545 | offset = 0; |
| 1546 | toDo = d->mSize; |
| 1547 | /* chew off 32-bit chunks */ |
| 1548 | while (toDo >= 4) { |
| 1549 | here = mkPCastTo( |
| 1550 | mce, Ity_I32, |
| 1551 | expr2vbits_LDle ( mce, Ity_I32, |
| 1552 | d->mAddr, d->mSize - toDo ) |
| 1553 | ); |
| 1554 | curr = mkUifU32(mce, here, curr); |
| 1555 | toDo -= 4; |
| 1556 | } |
| 1557 | /* chew off 16-bit chunks */ |
| 1558 | while (toDo >= 2) { |
| 1559 | here = mkPCastTo( |
| 1560 | mce, Ity_I32, |
| 1561 | expr2vbits_LDle ( mce, Ity_I16, |
| 1562 | d->mAddr, d->mSize - toDo ) |
| 1563 | ); |
| 1564 | curr = mkUifU32(mce, here, curr); |
| 1565 | toDo -= 2; |
| 1566 | } |
| 1567 | tl_assert(toDo == 0); /* also need to handle 1-byte excess */ |
| 1568 | } |
| 1569 | |
| 1570 | /* Whew! So curr is a 32-bit V-value summarising pessimistically |
| 1571 | all the inputs to the helper. Now we need to re-distribute the |
| 1572 | results to all destinations. */ |
| 1573 | |
| 1574 | /* Outputs: the destination temporary, if there is one. */ |
| 1575 | if (d->tmp != IRTemp_INVALID) { |
| 1576 | dst = findShadowTmp(mce, d->tmp); |
| 1577 | tyDst = typeOfIRTemp(mce->bb->tyenv, d->tmp); |
| 1578 | assign( mce->bb, dst, mkPCastTo( mce, tyDst, curr) ); |
| 1579 | } |
| 1580 | |
| 1581 | /* Outputs: guest state that we write or modify. */ |
| 1582 | for (i = 0; i < d->nFxState; i++) { |
| 1583 | tl_assert(d->fxState[i].fx != Ifx_None); |
| 1584 | if (d->fxState[i].fx == Ifx_Read) |
| 1585 | continue; |
sewardj | a720325 | 2004-11-26 19:17:47 +0000 | [diff] [blame] | 1586 | /* Ignore any sections marked as 'always defined'. */ |
| 1587 | if (isAlwaysDefd(mce, d->fxState[i].offset, d->fxState[i].size )) |
| 1588 | continue; |
sewardj | e9e16d3 | 2004-12-10 13:17:55 +0000 | [diff] [blame] | 1589 | /* This state element is written or modified. So we need to |
| 1590 | consider it. If larger than 8 bytes, deal with it in 8-byte |
| 1591 | chunks. */ |
| 1592 | gSz = d->fxState[i].size; |
| 1593 | gOff = d->fxState[i].offset; |
| 1594 | tl_assert(gSz > 0); |
| 1595 | while (True) { |
| 1596 | if (gSz == 0) break; |
| 1597 | n = gSz <= 8 ? gSz : 8; |
| 1598 | /* Write suitably-casted 'curr' to the state slice |
| 1599 | gOff .. gOff+n-1 */ |
| 1600 | tyDst = szToITy( n ); |
| 1601 | do_shadow_PUT( mce, gOff, |
| 1602 | NULL, /* original atom */ |
| 1603 | mkPCastTo( mce, tyDst, curr ) ); |
| 1604 | gSz -= n; |
| 1605 | gOff += n; |
| 1606 | } |
sewardj | 9544807 | 2004-11-22 20:19:51 +0000 | [diff] [blame] | 1607 | } |
| 1608 | |
| 1609 | /* Outputs: memory that we write or modify. */ |
| 1610 | if (d->mFx == Ifx_Write || d->mFx == Ifx_Modify) { |
| 1611 | offset = 0; |
| 1612 | toDo = d->mSize; |
| 1613 | /* chew off 32-bit chunks */ |
| 1614 | while (toDo >= 4) { |
| 1615 | do_shadow_STle( mce, d->mAddr, d->mSize - toDo, |
| 1616 | NULL, /* original data */ |
| 1617 | mkPCastTo( mce, Ity_I32, curr ) ); |
| 1618 | toDo -= 4; |
| 1619 | } |
| 1620 | /* chew off 16-bit chunks */ |
| 1621 | while (toDo >= 2) { |
| 1622 | do_shadow_STle( mce, d->mAddr, d->mSize - toDo, |
| 1623 | NULL, /* original data */ |
| 1624 | mkPCastTo( mce, Ity_I16, curr ) ); |
| 1625 | toDo -= 2; |
| 1626 | } |
| 1627 | tl_assert(toDo == 0); /* also need to handle 1-byte excess */ |
| 1628 | } |
| 1629 | |
njn25 | e49d8e7 | 2002-09-23 09:36:25 +0000 | [diff] [blame] | 1630 | } |
| 1631 | |
| 1632 | |
sewardj | 9544807 | 2004-11-22 20:19:51 +0000 | [diff] [blame] | 1633 | /*------------------------------------------------------------*/ |
| 1634 | /*--- Memcheck main ---*/ |
| 1635 | /*------------------------------------------------------------*/ |
njn25 | e49d8e7 | 2002-09-23 09:36:25 +0000 | [diff] [blame] | 1636 | |
sewardj | 9544807 | 2004-11-22 20:19:51 +0000 | [diff] [blame] | 1637 | #if 0 /* UNUSED */ |
| 1638 | static Bool isBogusAtom ( IRAtom* at ) |
njn25 | e49d8e7 | 2002-09-23 09:36:25 +0000 | [diff] [blame] | 1639 | { |
sewardj | 9544807 | 2004-11-22 20:19:51 +0000 | [diff] [blame] | 1640 | ULong n = 0; |
| 1641 | IRConst* con; |
| 1642 | tl_assert(isAtom(at)); |
| 1643 | if (at->tag == Iex_Tmp) |
| 1644 | return False; |
| 1645 | tl_assert(at->tag == Iex_Const); |
| 1646 | con = at->Iex.Const.con; |
| 1647 | switch (con->tag) { |
| 1648 | case Ico_U8: n = (ULong)con->Ico.U8; break; |
| 1649 | case Ico_U16: n = (ULong)con->Ico.U16; break; |
| 1650 | case Ico_U32: n = (ULong)con->Ico.U32; break; |
| 1651 | case Ico_U64: n = (ULong)con->Ico.U64; break; |
| 1652 | default: ppIRExpr(at); tl_assert(0); |
| 1653 | } |
| 1654 | /* VG_(printf)("%llx\n", n); */ |
| 1655 | return (n == 0xFEFEFEFF |
| 1656 | || n == 0x80808080 |
| 1657 | || n == 0x1010101 |
| 1658 | || n == 1010100); |
| 1659 | } |
njn25 | e49d8e7 | 2002-09-23 09:36:25 +0000 | [diff] [blame] | 1660 | |
sewardj | 9544807 | 2004-11-22 20:19:51 +0000 | [diff] [blame] | 1661 | static Bool checkForBogusLiterals ( /*FLAT*/ IRStmt* st ) |
| 1662 | { |
| 1663 | Int i; |
| 1664 | IRExpr* e; |
| 1665 | switch (st->tag) { |
| 1666 | case Ist_Tmp: |
| 1667 | e = st->Ist.Tmp.data; |
| 1668 | switch (e->tag) { |
| 1669 | case Iex_Get: |
| 1670 | case Iex_Tmp: |
| 1671 | return False; |
| 1672 | case Iex_Unop: |
| 1673 | return isBogusAtom(e->Iex.Unop.arg); |
| 1674 | case Iex_Binop: |
| 1675 | return isBogusAtom(e->Iex.Binop.arg1) |
| 1676 | || isBogusAtom(e->Iex.Binop.arg2); |
| 1677 | case Iex_Mux0X: |
| 1678 | return isBogusAtom(e->Iex.Mux0X.cond) |
| 1679 | || isBogusAtom(e->Iex.Mux0X.expr0) |
| 1680 | || isBogusAtom(e->Iex.Mux0X.exprX); |
| 1681 | case Iex_LDle: |
| 1682 | return isBogusAtom(e->Iex.LDle.addr); |
| 1683 | case Iex_CCall: |
| 1684 | for (i = 0; e->Iex.CCall.args[i]; i++) |
| 1685 | if (isBogusAtom(e->Iex.CCall.args[i])) |
| 1686 | return True; |
| 1687 | return False; |
| 1688 | default: |
| 1689 | goto unhandled; |
| 1690 | } |
| 1691 | case Ist_Put: |
| 1692 | return isBogusAtom(st->Ist.Put.data); |
| 1693 | case Ist_STle: |
| 1694 | return isBogusAtom(st->Ist.STle.addr) |
| 1695 | || isBogusAtom(st->Ist.STle.data); |
| 1696 | case Ist_Exit: |
| 1697 | return isBogusAtom(st->Ist.Exit.cond); |
| 1698 | default: |
| 1699 | unhandled: |
| 1700 | ppIRStmt(st); |
| 1701 | VG_(tool_panic)("hasBogusLiterals"); |
| 1702 | } |
| 1703 | } |
| 1704 | #endif /* UNUSED */ |
njn25 | e49d8e7 | 2002-09-23 09:36:25 +0000 | [diff] [blame] | 1705 | |
njn25 | e49d8e7 | 2002-09-23 09:36:25 +0000 | [diff] [blame] | 1706 | |
sewardj | 9544807 | 2004-11-22 20:19:51 +0000 | [diff] [blame] | 1707 | IRBB* TL_(instrument) ( IRBB* bb_in, VexGuestLayout* layout, IRType hWordTy ) |
| 1708 | { |
| 1709 | Bool verboze = False; //True; |
njn25 | e49d8e7 | 2002-09-23 09:36:25 +0000 | [diff] [blame] | 1710 | |
sewardj | 9544807 | 2004-11-22 20:19:51 +0000 | [diff] [blame] | 1711 | /* Bool hasBogusLiterals = False; */ |
njn25 | e49d8e7 | 2002-09-23 09:36:25 +0000 | [diff] [blame] | 1712 | |
sewardj | 9544807 | 2004-11-22 20:19:51 +0000 | [diff] [blame] | 1713 | Int i, j, first_stmt; |
| 1714 | IRStmt* st; |
| 1715 | MCEnv mce; |
njn25 | e49d8e7 | 2002-09-23 09:36:25 +0000 | [diff] [blame] | 1716 | |
sewardj | 9544807 | 2004-11-22 20:19:51 +0000 | [diff] [blame] | 1717 | /* Set up BB */ |
| 1718 | IRBB* bb = emptyIRBB(); |
| 1719 | bb->tyenv = dopyIRTypeEnv(bb_in->tyenv); |
| 1720 | bb->next = dopyIRExpr(bb_in->next); |
| 1721 | bb->jumpkind = bb_in->jumpkind; |
njn25 | e49d8e7 | 2002-09-23 09:36:25 +0000 | [diff] [blame] | 1722 | |
sewardj | 9544807 | 2004-11-22 20:19:51 +0000 | [diff] [blame] | 1723 | /* Set up the running environment. Only .bb is modified as we go |
| 1724 | along. */ |
| 1725 | mce.bb = bb; |
| 1726 | mce.layout = layout; |
| 1727 | mce.n_originalTmps = bb->tyenv->types_used; |
| 1728 | mce.hWordTy = hWordTy; |
| 1729 | mce.tmpMap = LibVEX_Alloc(mce.n_originalTmps * sizeof(IRTemp)); |
| 1730 | for (i = 0; i < mce.n_originalTmps; i++) |
| 1731 | mce.tmpMap[i] = IRTemp_INVALID; |
| 1732 | |
| 1733 | /* Iterate over the stmts. */ |
| 1734 | |
| 1735 | for (i = 0; i < bb_in->stmts_used; i++) { |
| 1736 | st = bb_in->stmts[i]; |
| 1737 | if (!st) continue; |
| 1738 | |
| 1739 | tl_assert(isFlatIRStmt(st)); |
| 1740 | |
| 1741 | /* |
| 1742 | if (!hasBogusLiterals) { |
| 1743 | hasBogusLiterals = checkForBogusLiterals(st); |
| 1744 | if (hasBogusLiterals) { |
| 1745 | VG_(printf)("bogus: "); |
| 1746 | ppIRStmt(st); |
| 1747 | VG_(printf)("\n"); |
| 1748 | } |
| 1749 | } |
| 1750 | */ |
| 1751 | first_stmt = bb->stmts_used; |
| 1752 | |
| 1753 | if (verboze) { |
| 1754 | ppIRStmt(st); |
| 1755 | VG_(printf)("\n\n"); |
| 1756 | } |
| 1757 | |
| 1758 | switch (st->tag) { |
| 1759 | |
| 1760 | case Ist_Tmp: |
| 1761 | assign( bb, findShadowTmp(&mce, st->Ist.Tmp.tmp), |
| 1762 | expr2vbits( &mce, st->Ist.Tmp.data) ); |
njn25 | e49d8e7 | 2002-09-23 09:36:25 +0000 | [diff] [blame] | 1763 | break; |
| 1764 | |
sewardj | 9544807 | 2004-11-22 20:19:51 +0000 | [diff] [blame] | 1765 | case Ist_Put: |
| 1766 | do_shadow_PUT( &mce, |
| 1767 | st->Ist.Put.offset, |
| 1768 | st->Ist.Put.data, |
| 1769 | NULL /* shadow atom */ ); |
njn25 | e49d8e7 | 2002-09-23 09:36:25 +0000 | [diff] [blame] | 1770 | break; |
| 1771 | |
sewardj | 9544807 | 2004-11-22 20:19:51 +0000 | [diff] [blame] | 1772 | case Ist_PutI: |
| 1773 | do_shadow_PUTI( &mce, |
| 1774 | st->Ist.PutI.descr, |
| 1775 | st->Ist.PutI.ix, |
| 1776 | st->Ist.PutI.bias, |
| 1777 | st->Ist.PutI.data ); |
njn25 | e49d8e7 | 2002-09-23 09:36:25 +0000 | [diff] [blame] | 1778 | break; |
| 1779 | |
sewardj | 9544807 | 2004-11-22 20:19:51 +0000 | [diff] [blame] | 1780 | case Ist_STle: |
| 1781 | do_shadow_STle( &mce, st->Ist.STle.addr, 0/* addr bias */, |
| 1782 | st->Ist.STle.data, |
| 1783 | NULL /* shadow data */ ); |
njn25 | e49d8e7 | 2002-09-23 09:36:25 +0000 | [diff] [blame] | 1784 | break; |
| 1785 | |
sewardj | 9544807 | 2004-11-22 20:19:51 +0000 | [diff] [blame] | 1786 | case Ist_Exit: |
| 1787 | /* if (!hasBogusLiterals) */ |
| 1788 | complainIfUndefined( &mce, st->Ist.Exit.guard ); |
njn25 | e49d8e7 | 2002-09-23 09:36:25 +0000 | [diff] [blame] | 1789 | break; |
| 1790 | |
sewardj | 9544807 | 2004-11-22 20:19:51 +0000 | [diff] [blame] | 1791 | case Ist_Dirty: |
| 1792 | do_shadow_Dirty( &mce, st->Ist.Dirty.details ); |
njn25 | e49d8e7 | 2002-09-23 09:36:25 +0000 | [diff] [blame] | 1793 | break; |
| 1794 | |
| 1795 | default: |
sewardj | 9544807 | 2004-11-22 20:19:51 +0000 | [diff] [blame] | 1796 | VG_(printf)("\n"); |
| 1797 | ppIRStmt(st); |
| 1798 | VG_(printf)("\n"); |
| 1799 | VG_(tool_panic)("memcheck: unhandled IRStmt"); |
| 1800 | |
| 1801 | } /* switch (st->tag) */ |
| 1802 | |
| 1803 | if (verboze) { |
| 1804 | for (j = first_stmt; j < bb->stmts_used; j++) { |
| 1805 | VG_(printf)(" "); |
| 1806 | ppIRStmt(bb->stmts[j]); |
| 1807 | VG_(printf)("\n"); |
| 1808 | } |
| 1809 | VG_(printf)("\n"); |
njn25 | e49d8e7 | 2002-09-23 09:36:25 +0000 | [diff] [blame] | 1810 | } |
sewardj | 9544807 | 2004-11-22 20:19:51 +0000 | [diff] [blame] | 1811 | |
| 1812 | addStmtToIRBB(bb, st); |
| 1813 | |
njn25 | e49d8e7 | 2002-09-23 09:36:25 +0000 | [diff] [blame] | 1814 | } |
njn25 | e49d8e7 | 2002-09-23 09:36:25 +0000 | [diff] [blame] | 1815 | |
sewardj | 9544807 | 2004-11-22 20:19:51 +0000 | [diff] [blame] | 1816 | /* Now we need to complain if the jump target is undefined. */ |
| 1817 | first_stmt = bb->stmts_used; |
njn25 | e49d8e7 | 2002-09-23 09:36:25 +0000 | [diff] [blame] | 1818 | |
sewardj | 9544807 | 2004-11-22 20:19:51 +0000 | [diff] [blame] | 1819 | if (verboze) { |
| 1820 | VG_(printf)("bb->next = "); |
| 1821 | ppIRExpr(bb->next); |
| 1822 | VG_(printf)("\n\n"); |
| 1823 | } |
njn25 | e49d8e7 | 2002-09-23 09:36:25 +0000 | [diff] [blame] | 1824 | |
sewardj | 9544807 | 2004-11-22 20:19:51 +0000 | [diff] [blame] | 1825 | complainIfUndefined( &mce, bb->next ); |
njn25 | e49d8e7 | 2002-09-23 09:36:25 +0000 | [diff] [blame] | 1826 | |
sewardj | 9544807 | 2004-11-22 20:19:51 +0000 | [diff] [blame] | 1827 | if (verboze) { |
| 1828 | for (j = first_stmt; j < bb->stmts_used; j++) { |
| 1829 | VG_(printf)(" "); |
| 1830 | ppIRStmt(bb->stmts[j]); |
| 1831 | VG_(printf)("\n"); |
njn25 | e49d8e7 | 2002-09-23 09:36:25 +0000 | [diff] [blame] | 1832 | } |
sewardj | 9544807 | 2004-11-22 20:19:51 +0000 | [diff] [blame] | 1833 | VG_(printf)("\n"); |
njn25 | e49d8e7 | 2002-09-23 09:36:25 +0000 | [diff] [blame] | 1834 | } |
njn25 | e49d8e7 | 2002-09-23 09:36:25 +0000 | [diff] [blame] | 1835 | |
sewardj | 9544807 | 2004-11-22 20:19:51 +0000 | [diff] [blame] | 1836 | return bb; |
| 1837 | } |
njn25 | e49d8e7 | 2002-09-23 09:36:25 +0000 | [diff] [blame] | 1838 | |
| 1839 | /*--------------------------------------------------------------------*/ |
njn25 | cac76cb | 2002-09-23 11:21:57 +0000 | [diff] [blame] | 1840 | /*--- end mc_translate.c ---*/ |
njn25 | e49d8e7 | 2002-09-23 09:36:25 +0000 | [diff] [blame] | 1841 | /*--------------------------------------------------------------------*/ |