| File: | src/of_emerg.c |
| Warning: | line 1283, column 2 Value stored to 'isCircular' is never read |
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| 1 | /***************************************************************************** |
| 2 | * |
| 3 | * of_emerg.c: Environment merging. |
| 4 | * |
| 5 | * Copyright (c) 1990-2007 Aldor Software Organization Ltd (Aldor.org). |
| 6 | * |
| 7 | ****************************************************************************/ |
| 8 | |
| 9 | /* |
| 10 | * This file implements data structure merging. |
| 11 | * |
| 12 | * Environment merging destructively modifies a foam unit by replacing |
| 13 | * heap allocated storage by stack allocated storage when it can. |
| 14 | * |
| 15 | * emerge knows about four ways of creating new storage: |
| 16 | * FOAM_RNew -- create a new record. |
| 17 | * FOAM_PushEnv -- create a new lexical environment level. |
| 18 | * FOAM_ANew -- create a new array. |
| 19 | * procedure entry -- create a new lexical environment level. |
| 20 | * |
| 21 | * and one way of explicitly releasing allocated storage: |
| 22 | * FOAM_Free |
| 23 | * |
| 24 | * For each of these types of storage we analyze whether or not it escapes. |
| 25 | * A piece of storage is deemed to escape if we pass it to another function, |
| 26 | * it is returned from the function or it is pointed to by another structure |
| 27 | * which escapes. |
| 28 | * |
| 29 | * [Actually we don't mind if it is returned from a function] |
| 30 | * |
| 31 | * Once we determine that a structure does not escape (and for arrays that |
| 32 | * it indexed only by constant values), then we replace all the elements |
| 33 | * of the structure with local variables. We make sure that all local |
| 34 | * variables that are aliased to non-escaping storage get expanded too. |
| 35 | * |
| 36 | * To Do: |
| 37 | * Get rid of -Wemerge-noalias option |
| 38 | * New environments: FOAM_TRNew, FOAM_IRElt, FOAM_TRElt |
| 39 | * Better flow anlysis. |
| 40 | * [ More acurately determine when variables alias each other. |
| 41 | * The analysis is currently too conservative, and will not merge |
| 42 | * variables which are multiply aliased, but these can be merged |
| 43 | * if they are not side-effected. ] TTT does not think we need |
| 44 | * better flow analysis here. If we do the expanding properly |
| 45 | * (which TTT thinks we do), other later optimisations will clean |
| 46 | * up after us. |
| 47 | */ |
| 48 | |
| 49 | #include "debug.h" |
| 50 | #include "of_deadv.h" |
| 51 | #include "of_util.h" |
| 52 | #include "store.h" |
| 53 | #include "syme.h" |
| 54 | #include "sexpr.h" |
| 55 | |
| 56 | Bool emergeDebug = false((int) 0); |
| 57 | #define emergeDEBUGif (!emergeDebug) { } else afprintf DEBUG_IF(emerge)if (!emergeDebug) { } else afprintf |
| 58 | |
| 59 | typedef enum emUsageState { |
| 60 | EM_DontKnow, /* what we start with */ |
| 61 | EM_NotEnv, /* Not a candidate for merging */ |
| 62 | EM_EscapingEnv, /* A candidate, but environment escapes */ |
| 63 | EM_NonEscapingEnv, /* A candidate which doesn't escape */ |
| 64 | EM_AliasNonEsc /* is used as an alias of non-escaping env */ |
| 65 | } EmUsageState; |
| 66 | |
| 67 | typedef struct emUsage { |
| 68 | EmUsageState used; /* Usage flag */ |
| 69 | int format; /* format of env (size of array) */ |
| 70 | Foam type; /* Foam instruction creating env */ |
| 71 | Foam decl; /* Foam decl for this variable */ |
| 72 | Foam *remap; /* Vector of remaps to locals */ |
| 73 | BPack(Bool)UByte mark; /* mark for detecting circular links */ |
| 74 | BPack(Bool)UByte isSet; /* has an assignment been seen? */ |
| 75 | struct emUsage *link; /* for following aliases of locals */ |
| 76 | } *EmUsage; |
| 77 | |
| 78 | localstatic void emMergeDefs (Foam defs); |
| 79 | localstatic void emMergeProg (Foam prog); |
| 80 | localstatic EmUsage emMakeUsageVec (Foam ddecl); |
| 81 | localstatic void emMarkUsage (Foam expr); |
| 82 | localstatic void emMarkLocal (Foam loc); |
| 83 | localstatic void emMarkDef (Foam def); |
| 84 | localstatic void emMarkParents (Foam); |
| 85 | localstatic void emMarkCallArgs (Length argc, Foam *argv); |
| 86 | localstatic void emMarkClos (Foam clos); |
| 87 | localstatic void emMarkGener (Foam gener); |
| 88 | localstatic void emMarkAElt (Foam aelt); |
| 89 | localstatic void emMarkRElt (Foam aelt); |
| 90 | localstatic void emMarkRRElt (Foam aelt); |
| 91 | localstatic Bool emCheckRElt (Foam relt, int fmt); |
| 92 | localstatic void emComputeRemap (Foam prog); |
| 93 | localstatic void emRemapEnv0 (EmUsage, EmUsage); |
| 94 | localstatic void emMergeEnv (int n, Bool); |
| 95 | localstatic void emMergeArray (int n, Foam, Bool); |
| 96 | localstatic Foam emNewBody (void); |
| 97 | localstatic void emAddStmt (Foam stmt); |
| 98 | localstatic void emMakeNewLocals (Foam prog); |
| 99 | localstatic void emMergeEnvs (Foam prog); |
| 100 | localstatic Foam emMergeDef (Foam def); |
| 101 | localstatic Foam emNewEnvSet (Foam def, Foam lhs, Foam rhs); |
| 102 | localstatic Foam emMergeExpr (Foam expr); |
| 103 | localstatic Foam emMergeRElt (Foam expr, Foam env, int index); |
| 104 | localstatic Foam emMergeEElt (Foam expr, Foam env, int index); |
| 105 | localstatic Foam emMergeLex (Foam lex); |
| 106 | localstatic Foam emMergeEEnv (Foam eenv); |
| 107 | localstatic Foam emMergeFree (Foam foam); |
| 108 | localstatic Foam emMergeReturn (Foam expr); |
| 109 | localstatic Foam emMergeYield (Foam expr); |
| 110 | localstatic Foam emMergeAElt (Foam aelt); |
| 111 | localstatic EmUsage emUsageAliasing (Foam loc); |
| 112 | localstatic EmUsage emUsage (Foam foam); |
| 113 | localstatic EmUsage emUsageFromLocalIndexAliasing (long index); |
| 114 | localstatic EmUsage emUsageFromLocalIndex(long index); |
| 115 | localstatic long emIndexFromUsage (EmUsage u); |
| 116 | |
| 117 | localstatic void emCopyUsedTagsTo (EmUsageState *arr); |
| 118 | localstatic Bool emUsedTagsChanged (EmUsageState *arr); |
| 119 | localstatic void emNormaliseUsage (void); |
| 120 | localstatic void emCleanTypeUsage (void); |
| 121 | localstatic void emNewParentTable (void); |
| 122 | localstatic void emFreeParentTable (void); |
| 123 | localstatic void emSetParent (Foam child, Foam parent); |
| 124 | localstatic Foam emGetParent (Foam child); |
| 125 | localstatic Foam emGetNthParent (Foam child, int *level); |
| 126 | localstatic Foam emUnEEnv (Foam foam); |
| 127 | |
| 128 | Bool emChanged; /* True iff the unit changed. */ |
| 129 | EmUsage emLocalUsage; /* Local usage vector for a prog. */ |
| 130 | int emNumLocals; /* Number of locals in the prog */ |
| 131 | int emOrigNumLocals; /* Number of locals before merging */ |
| 132 | FoamList emNewLocals; /* Decls of locals added to prog. */ |
| 133 | FoamList emStmtList; /* Statements added to prog. */ |
| 134 | Foam *emFormats; /* Formats for the unit. */ |
| 135 | int emCount; /* how many times are we merging */ |
| 136 | int emDefNo; /* the current definition index being processed */ |
| 137 | |
| 138 | Bool emNoAlias = false((int) 0); /* Avoid alias code for non-envs */ |
| 139 | |
| 140 | |
| 141 | /***************************************************************************** |
| 142 | * |
| 143 | * :: Macros |
| 144 | * |
| 145 | ****************************************************************************/ |
| 146 | |
| 147 | #define emIsArray(foam)((foam) && ((foam)->hdr.tag) == FOAM_ANew) ((foam) && foamTag(foam)((foam)->hdr.tag) == FOAM_ANew) |
| 148 | |
| 149 | #define emOldLocal(i)(((i)->hdr.tag) != FOAM_Loc || ((i)->foamLoc.index < emOrigNumLocals)) (foamTag(i)((i)->hdr.tag) != FOAM_Loc || \ |
| 150 | ((i)->foamLoc.index < emOrigNumLocals)) |
| 151 | |
| 152 | /***************************************************************************** |
| 153 | * |
| 154 | * :: Main code |
| 155 | * |
| 156 | ****************************************************************************/ |
| 157 | |
| 158 | void |
| 159 | emSetNoAlias() |
| 160 | { |
| 161 | emNoAlias = true1; |
| 162 | } |
| 163 | |
| 164 | |
| 165 | /* |
| 166 | * Merge environments until no more merging is possible. |
| 167 | * We use emCount |
| 168 | */ |
| 169 | void |
| 170 | emMergeUnit(Foam unit) |
| 171 | { |
| 172 | assert(foamTag(unit) == FOAM_Unit)do { if (!(((unit)->hdr.tag) == FOAM_Unit)) _do_assert(("foamTag(unit) == FOAM_Unit" ),"of_emerg.c",172); } while (0); |
| 173 | emFormats = unit->foamUnit.formats->foamDFmt.argv; |
| 174 | emChanged = true1; |
| 175 | |
| 176 | for (emCount = 0; emChanged && emCount < 10 ; emCount++) { |
| 177 | dvElim(unit); |
| 178 | emChanged = false((int) 0); |
| 179 | emMergeDefs(unit->foamUnit.defs); |
| 180 | } |
| 181 | |
| 182 | assert(foamAudit(unit))do { if (!(foamAudit(unit))) _do_assert(("foamAudit(unit)"),"of_emerg.c" ,182); } while (0); |
| 183 | } |
| 184 | |
| 185 | /* |
| 186 | * For each program definition in a unit, merge it. |
| 187 | */ |
| 188 | |
| 189 | int emDebugDefNo = -1; /* this is useful when debugging a perticular prog */ |
| 190 | |
| 191 | localstatic void |
| 192 | emMergeDefs(Foam defs) |
| 193 | { |
| 194 | |
| 195 | for(emDefNo =0; emDefNo<foamArgc(defs)((defs)->hdr.argc); emDefNo++) { |
| 196 | Foam def = defs->foamDDef.argv[emDefNo]; |
| 197 | Foam prog; |
| 198 | |
| 199 | /* #if 0*/ /* enable this if you want to see in-out foam when debugging */ |
| 200 | if (DEBUG(emerge)emergeDebug) { |
| 201 | if (emDebugDefNo == -1 || emDefNo == emDebugDefNo) { |
| 202 | fprintf(dbOut, "Prog--index%d--count%d<<\n",emDefNo,emCount); |
| 203 | foamPrintDb(def); |
| 204 | } |
| 205 | } |
| 206 | /* #endif */ |
| 207 | assert(foamTag(def) == FOAM_Def)do { if (!(((def)->hdr.tag) == FOAM_Def)) _do_assert(("foamTag(def) == FOAM_Def" ),"of_emerg.c",207); } while (0); |
| 208 | prog = def->foamDef.rhs; |
| 209 | if (foamTag(prog)((prog)->hdr.tag) == FOAM_Prog) |
| 210 | emMergeProg(prog); |
| 211 | |
| 212 | /* #if 0*/ /* enable this if you want to see in-out foam when debugging */ |
| 213 | if (DEBUG(emerge)emergeDebug) { |
| 214 | if (emDebugDefNo == -1 || emDefNo == emDebugDefNo) { |
| 215 | fprintf(dbOut, "Prog--index%d--count%d>>\n",emDefNo,emCount); |
| 216 | foamPrintDb(def); |
| 217 | } |
| 218 | } |
| 219 | /* #endif */ |
| 220 | } |
| 221 | } |
| 222 | |
| 223 | |
| 224 | /* |
| 225 | * Merge the environments for a single program. |
| 226 | */ |
| 227 | localstatic void |
| 228 | emMergeProg(Foam prog) |
| 229 | { |
| 230 | int emMarkCount = 1 ; |
| 231 | EmUsageState * usedArray; |
| 232 | emLocalUsage = emMakeUsageVec(prog->foamProg.locals); |
| 233 | emOrigNumLocals = foamDDeclArgc(prog->foamProg.locals)(((prog->foamProg.locals)->hdr.argc) - (1)); |
| 234 | |
| 235 | /* previously on ER ... , no seriously, this keeps all the used |
| 236 | tags from the previous marking run */ |
| 237 | usedArray = (EmUsageState *) stoAlloc(OB_Other0, (emOrigNumLocals+1) * sizeof(EmUsageState)); |
| 238 | |
| 239 | emLocalUsage->format = prog->foamProg.levels->foamDEnv.argv[0]; |
| 240 | emNewParentTable(); |
| 241 | |
| 242 | emMarkUsage(prog->foamProg.body); /*first time */ |
| 243 | emCopyUsedTagsTo(usedArray); |
| 244 | |
| 245 | for ( ; emMarkCount<10 ;emMarkCount++) { |
| 246 | emCleanTypeUsage(); |
| 247 | emMarkUsage(prog->foamProg.body); |
| 248 | if ( ! emUsedTagsChanged(usedArray) ) break; |
| 249 | emCopyUsedTagsTo(usedArray); |
| 250 | } |
| 251 | |
| 252 | emComputeRemap(prog); |
| 253 | |
| 254 | #if 0 /* enable this if you want to see in-out sets when debugging */ |
| 255 | emergeDEBUGif (!emergeDebug) { } else afprintf(dbOut, "Pass:%2d Prog:%2d #locals:(%3d -> %3d)\n", |
| 256 | emCount, emDefNo,emOrigNumLocals, emNumLocals); |
| 257 | #endif |
| 258 | if (!emChanged) return; |
| 259 | |
| 260 | /* now that the marking is done we can get rid of all links |
| 261 | except to non-escaped storage */ |
| 262 | emNormaliseUsage(); |
| 263 | |
| 264 | emMergeEnvs(prog); |
| 265 | |
| 266 | if (emLocalUsage->used == EM_NonEscapingEnv) |
| 267 | prog->foamProg.levels->foamDEnv.argv[0] = emptyFormatSlot4; |
| 268 | emFreeParentTable(); |
| 269 | } |
| 270 | |
| 271 | |
| 272 | /* |
| 273 | * Make an empty usage vector for the locals in a program. |
| 274 | */ |
| 275 | localstatic EmUsage |
| 276 | emMakeUsageVec(Foam ddecl) |
| 277 | { |
| 278 | int i, size; |
| 279 | EmUsage emu; |
| 280 | |
| 281 | assert(foamTag(ddecl) == FOAM_DDecl)do { if (!(((ddecl)->hdr.tag) == FOAM_DDecl)) _do_assert(( "foamTag(ddecl) == FOAM_DDecl"),"of_emerg.c",281); } while (0 ); |
| 282 | size = foamDDeclArgc(ddecl)(((ddecl)->hdr.argc) - (1)) + 1; /* +1 for Env(0) */ |
| 283 | emu = (EmUsage) stoAlloc(OB_Other0, size*sizeof(struct emUsage)); |
| 284 | |
| 285 | for(i=0; i < size; i++ ) { |
| 286 | emu[i].used = EM_DontKnow; |
| 287 | emu[i].remap = 0; |
| 288 | emu[i].link = 0; |
| 289 | emu[i].mark = 0; |
| 290 | emu[i].type = 0; |
| 291 | emu[i].decl = NULL((void*)0); |
| 292 | emu[i].isSet = false((int) 0); |
| 293 | emu[i].format = emptyFormatSlot4; |
| 294 | } |
| 295 | emu[0].used = EM_NonEscapingEnv; /* for Env(0) */ |
| 296 | emu[0].decl = NULL((void*)0); |
| 297 | for (i=0; i<foamDDeclArgc(ddecl)(((ddecl)->hdr.argc) - (1)); i++) { |
| 298 | emu[i+1].decl = ddecl->foamDDecl.argv[i]; |
| 299 | } |
| 300 | return emu; |
| 301 | } |
| 302 | |
| 303 | |
| 304 | /* |
| 305 | * Traverse an arbitrary Foam expression, looking for environment usage, |
| 306 | * and marking escaping environments. |
| 307 | */ |
| 308 | localstatic void |
| 309 | emMarkUsage(Foam expr) |
| 310 | { |
| 311 | Foam *argv; |
| 312 | int argc; |
| 313 | |
| 314 | foamIter(expr, arg, emMarkUsage(*arg)){ { String argf = (foamInfoTable [(int)(((expr)->hdr.tag)) -(int)FOAM_START]).argf; Length _i; for (_i = 0; _i < ((expr )->hdr.argc); _i++, argf++) { if (*argf == '*') argf--; if (*argf == 'C') { Foam *arg = (Foam *) ((expr)->foamGen.argv )+_i; { emMarkUsage(*arg); }; } } }; }; |
| 315 | |
| 316 | switch(foamTag(expr)((expr)->hdr.tag)) { |
| 317 | case FOAM_Set: |
| 318 | case FOAM_Def: |
| 319 | emMarkDef(expr); |
| 320 | return; |
| 321 | case FOAM_AElt: |
| 322 | emMarkAElt(expr); |
| 323 | return; |
| 324 | case FOAM_RElt: |
| 325 | emMarkRElt(expr); |
| 326 | return; |
| 327 | case FOAM_RRElt: |
| 328 | emMarkRRElt(expr); |
| 329 | return; |
| 330 | case FOAM_OCall: { |
| 331 | Foam env = expr->foamOCall.env; |
| 332 | emMarkLocal(env); |
| 333 | argv = expr->foamOCall.argv; |
| 334 | argc = foamOCallArgc(expr)(((expr)->hdr.argc) - (3)); |
| 335 | break; } |
| 336 | case FOAM_CCall: |
| 337 | argv = expr->foamCCall.argv; |
| 338 | argc = foamCCallArgc(expr)(((expr)->hdr.argc) - (2) ); |
| 339 | break; |
| 340 | case FOAM_PCall: |
| 341 | argv = expr->foamPCall.argv; |
| 342 | argc = foamPCallArgc(expr)(((expr)->hdr.argc) - (3)); |
| 343 | break; |
| 344 | case FOAM_BCall: |
| 345 | argv = expr->foamBCall.argv; |
| 346 | argc = foamBCallArgc(expr)(((expr)->hdr.argc) - (1)); |
| 347 | break; |
| 348 | case FOAM_Clos: |
| 349 | emMarkClos(expr); |
| 350 | return; |
| 351 | case FOAM_Gener: |
| 352 | emMarkGener(expr); |
| 353 | return; |
| 354 | case FOAM_Yield: |
| 355 | emMarkLocal(expr->foamYield.value); |
| 356 | return; |
| 357 | case FOAM_Return: |
| 358 | /*!! need to write a copy on returner! */ |
| 359 | emMarkLocal(expr->foamReturn.value); |
| 360 | return; |
| 361 | default: |
| 362 | return; |
| 363 | } |
| 364 | emMarkCallArgs(argc, argv); |
| 365 | } |
| 366 | |
| 367 | #define emIsMergeable(x)(((x)->hdr.tag) == FOAM_Loc || (((x)->hdr.tag) == FOAM_Env && (x)->foamEnv.level == 0)) \ |
| 368 | (foamTag(x)((x)->hdr.tag) == FOAM_Loc || (foamTag(x)((x)->hdr.tag) == FOAM_Env && \ |
| 369 | (x)->foamEnv.level == 0)) |
| 370 | |
| 371 | /* |
| 372 | * Mark a local as an escaping environment, traversing alias links. |
| 373 | */ |
| 374 | localstatic void |
| 375 | emMarkLocal(Foam var) |
| 376 | { |
| 377 | Foam nvar; |
| 378 | EmUsage u; |
| 379 | |
| 380 | foamDereferenceCast(var)while (((var)->hdr.tag) == FOAM_Cast) (var) = (var)->foamCast .expr;; |
| 381 | |
| 382 | if (foamTag(var)((var)->hdr.tag) == FOAM_Values) { |
| 383 | int i; |
| 384 | for(i=0; i<foamArgc(var)((var)->hdr.argc); i++) |
| 385 | emMarkLocal(var->foamValues.argv[i]); |
| 386 | return; |
| 387 | } |
| 388 | |
| 389 | nvar = emUnEEnv(var); |
| 390 | if (nvar != var) emChanged = true1; |
| 391 | |
| 392 | do { |
| 393 | foamDereferenceCast(nvar)while (((nvar)->hdr.tag) == FOAM_Cast) (nvar) = (nvar)-> foamCast.expr;; |
| 394 | |
| 395 | if (emIsMergeable(nvar)(((nvar)->hdr.tag) == FOAM_Loc || (((nvar)->hdr.tag) == FOAM_Env && (nvar)->foamEnv.level == 0))) { |
| 396 | /* modify the used field of the actual storage */ |
| 397 | u = emUsageAliasing(nvar); |
| 398 | u->used = EM_EscapingEnv; |
| 399 | } |
| 400 | nvar = emGetParent(nvar); |
| 401 | } while(nvar); |
| 402 | } |
| 403 | |
| 404 | /* |
| 405 | * Predicate identifying the foam instructions which create environmnets. |
| 406 | */ |
| 407 | #define emIsMergingCandidate(foam)(((foam)->hdr.tag) == FOAM_RNew || ((foam)->hdr.tag) == FOAM_PushEnv || (((foam)->hdr.tag) == FOAM_ANew && (((foam->foamANew.size)->hdr.tag) == FOAM_SInt || (((foam ->foamANew.size)->hdr.tag) == FOAM_Cast && ((foam ->foamANew.size->foamCast.expr)->hdr.tag) == FOAM_SInt )))) (foamTag(foam)((foam)->hdr.tag) == FOAM_RNew || \ |
| 408 | foamTag(foam)((foam)->hdr.tag) == FOAM_PushEnv || \ |
| 409 | (foamTag(foam)((foam)->hdr.tag) == FOAM_ANew && \ |
| 410 | emIsSInt(foam->foamANew.size)(((foam->foamANew.size)->hdr.tag) == FOAM_SInt || (((foam ->foamANew.size)->hdr.tag) == FOAM_Cast && ((foam ->foamANew.size->foamCast.expr)->hdr.tag) == FOAM_SInt )))) |
| 411 | |
| 412 | #define emIsSInt(foam)(((foam)->hdr.tag) == FOAM_SInt || (((foam)->hdr.tag) == FOAM_Cast && ((foam->foamCast.expr)->hdr.tag) == FOAM_SInt)) \ |
| 413 | (foamTag(foam)((foam)->hdr.tag) == FOAM_SInt || \ |
| 414 | (foamTag(foam)((foam)->hdr.tag) == FOAM_Cast \ |
| 415 | && foamTag(foam->foamCast.expr)((foam->foamCast.expr)->hdr.tag) == FOAM_SInt)) |
| 416 | |
| 417 | #define emSIntValue(foam)(((foam)->hdr.tag) == FOAM_SInt ? foam->foamSInt.SIntData : foam->foamCast.expr->foamSInt.SIntData) \ |
| 418 | (foamTag(foam)((foam)->hdr.tag) == FOAM_SInt ? foam->foamSInt.SIntData : \ |
| 419 | foam->foamCast.expr->foamSInt.SIntData) |
| 420 | |
| 421 | /* |
| 422 | * Check a definition for usage. This function finds the creation |
| 423 | * of new environments and keeps track of local variable aliases. |
| 424 | * The logic could be cleaned up a bit. |
| 425 | */ |
| 426 | localstatic void |
| 427 | emMarkDef(Foam def) |
| 428 | { |
| 429 | Foam lhs = def->foamDef.lhs; |
| 430 | Foam rhs = def->foamDef.rhs; |
| 431 | Foam rhs0 = rhs; |
| 432 | FoamTag ltag = foamTag(lhs)((lhs)->hdr.tag), rtag = foamTag(rhs)((rhs)->hdr.tag); |
| 433 | EmUsage usage; |
| 434 | Bool wasSet = 999; |
| 435 | |
| 436 | assert(foamTag(def) == FOAM_Set || foamTag(def) == FOAM_Def)do { if (!(((def)->hdr.tag) == FOAM_Set || ((def)->hdr. tag) == FOAM_Def)) _do_assert(("foamTag(def) == FOAM_Set || foamTag(def) == FOAM_Def" ),"of_emerg.c",436); } while (0); |
| 437 | |
| 438 | if (rtag == FOAM_PushEnv) |
| 439 | emSetParent(lhs, rhs->foamPushEnv.parent); |
| 440 | |
| 441 | if (ltag == FOAM_Loc) { |
| 442 | /* Update the root usage for this local */ |
| 443 | usage = emUsage(lhs); |
| 444 | wasSet = usage->isSet; |
| 445 | usage->isSet = true1; |
| 446 | if (emIsMergingCandidate(rhs)(((rhs)->hdr.tag) == FOAM_RNew || ((rhs)->hdr.tag) == FOAM_PushEnv || (((rhs)->hdr.tag) == FOAM_ANew && (((rhs->foamANew .size)->hdr.tag) == FOAM_SInt || (((rhs->foamANew.size) ->hdr.tag) == FOAM_Cast && ((rhs->foamANew.size ->foamCast.expr)->hdr.tag) == FOAM_SInt))))) { |
| 447 | /* |
| 448 | * What is the actual usage of this local |
| 449 | * taking into account aliasing etc. |
| 450 | */ |
| 451 | usage = emUsageAliasing(lhs); |
| 452 | |
| 453 | |
| 454 | /* Check for reuse of locals */ |
| 455 | if (usage->type) { |
| 456 | /* |
| 457 | * This local has already been allocated |
| 458 | * heap storage and we are now allocating |
| 459 | * some more. Since the new structure may |
| 460 | * be of a different type or size we have |
| 461 | * to mark it as escaping. |
| 462 | */ |
| 463 | emMarkLocal(lhs); |
| 464 | return; |
| 465 | } |
| 466 | |
| 467 | |
| 468 | /* Has this local escaped already? */ |
| 469 | if (usage->used != EM_EscapingEnv) { |
| 470 | if (rtag == FOAM_PushEnv) |
| 471 | usage->format =rhs->foamPushEnv.format; |
| 472 | else if (rtag == FOAM_RNew) { |
| 473 | if (emCheckRElt(lhs, rhs->foamRNew.format)) |
| 474 | usage->format = rhs->foamRNew.format; |
| 475 | else |
| 476 | emMarkLocal(lhs); |
| 477 | } |
| 478 | else |
| 479 | usage->format = |
| 480 | emSIntValue(rhs->foamANew.size)(((rhs->foamANew.size)->hdr.tag) == FOAM_SInt ? rhs-> foamANew.size->foamSInt.SIntData : rhs->foamANew.size-> foamCast.expr->foamSInt.SIntData); |
| 481 | usage->used = EM_NonEscapingEnv; |
| 482 | usage->type = rhs; |
| 483 | } |
| 484 | return; |
| 485 | } |
| 486 | } |
| 487 | else |
| 488 | emMarkParents(lhs); |
| 489 | |
| 490 | foamDereferenceCast(rhs0)while (((rhs0)->hdr.tag) == FOAM_Cast) (rhs0) = (rhs0)-> foamCast.expr;; |
| 491 | |
| 492 | if (foamTag(rhs0)((rhs0)->hdr.tag) == FOAM_Loc) { |
| 493 | if (ltag == FOAM_Loc) { |
| 494 | if (emUsageAliasing(lhs)->used == |
| 495 | EM_EscapingEnv) { |
| 496 | emMarkLocal(rhs0); |
| 497 | emMarkLocal(lhs); |
| 498 | } |
| 499 | else if (emUsage(lhs)->link == 0 && !wasSet && |
| 500 | emUsage(rhs0)->type && |
| 501 | foamTag(emUsage(rhs0)->type)((emUsage(rhs0)->type)->hdr.tag) |
| 502 | == FOAM_PushEnv) { |
| 503 | Foam parent = emGetParent(rhs0); |
| 504 | emUsage(lhs)->link = emUsage(rhs0); |
| 505 | if (parent) |
| 506 | emSetParent(lhs, parent); |
| 507 | } |
| 508 | else if (!emNoAlias && emUsage(lhs)->link == 0) { |
| 509 | Foam parent = emGetParent(rhs0); |
| 510 | emUsage(lhs)->link = emUsageAliasing(rhs0); |
| 511 | if (parent) |
| 512 | emSetParent(lhs, parent); |
| 513 | } |
| 514 | else { |
| 515 | /* the lhs is already associated with another link */ |
| 516 | assert(emUsage(lhs)->link)do { if (!(emUsage(lhs)->link)) _do_assert(("emUsage(lhs)->link" ),"of_emerg.c",516); } while (0); |
| 517 | assert(emUsageAliasing(lhs)->used == EM_NonEscapingEnv ||do { if (!(emUsageAliasing(lhs)->used == EM_NonEscapingEnv || emUsageAliasing(lhs)->used == EM_DontKnow)) _do_assert (("emUsageAliasing(lhs)->used == EM_NonEscapingEnv || emUsageAliasing(lhs)->used == EM_DontKnow" ),"of_emerg.c",518); } while (0) |
| 518 | emUsageAliasing(lhs)->used == EM_DontKnow)do { if (!(emUsageAliasing(lhs)->used == EM_NonEscapingEnv || emUsageAliasing(lhs)->used == EM_DontKnow)) _do_assert (("emUsageAliasing(lhs)->used == EM_NonEscapingEnv || emUsageAliasing(lhs)->used == EM_DontKnow" ),"of_emerg.c",518); } while (0); |
| 519 | if (emUsageAliasing(lhs)->used == EM_DontKnow) |
| 520 | emUsageAliasing(lhs)->link = emUsageAliasing(rhs0); |
| 521 | emUsage(lhs)->link = emUsageAliasing(rhs0); |
| 522 | /* emMarkLocal(rhs0); */ |
| 523 | } |
| 524 | } |
| 525 | else |
| 526 | emMarkLocal(rhs); |
| 527 | } |
| 528 | else if (foamTag(rhs0)((rhs0)->hdr.tag) == FOAM_Env) { |
| 529 | emSetParent(lhs, foamNewEnv(rhs0->foamEnv.level + 1)foamNew(FOAM_Env, 1, (AInt)(rhs0->foamEnv.level + 1))); |
| 530 | if (rhs0->foamEnv.level == 0) { |
| 531 | emUsage(lhs)->link = emUsage(rhs0); |
| 532 | } |
| 533 | } |
| 534 | else if (foamTag(rhs0)((rhs0)->hdr.tag) == FOAM_MFmt) { |
| 535 | /* |
| 536 | * Strictly speaking we ought to always mark the lhs |
| 537 | * of a multi-valued set as escaping or at least we |
| 538 | * ought to check both sides of the definition. For |
| 539 | * now we don't because it always seems to work out |
| 540 | * okay except when the rhs is a catch expression. |
| 541 | */ |
| 542 | Foam mval = rhs0->foamMFmt.value; |
| 543 | |
| 544 | |
| 545 | /* Check for a catch on the rhs */ |
| 546 | if (foamTag(mval)((mval)->hdr.tag) == FOAM_Catch) |
| 547 | { |
| 548 | /* Mark the lhs (a FOAM_Values hopefully) */ |
| 549 | emMarkLocal(lhs); |
| 550 | } |
| 551 | } |
| 552 | } |
| 553 | |
| 554 | /* |
| 555 | * Mark a local variable and its parents as escaping. |
| 556 | */ |
| 557 | localstatic void |
| 558 | emMarkParents(Foam foam) |
| 559 | { |
| 560 | do { |
| 561 | if (emIsMergeable(foam)(((foam)->hdr.tag) == FOAM_Loc || (((foam)->hdr.tag) == FOAM_Env && (foam)->foamEnv.level == 0))) |
| 562 | emMarkLocal(foam); |
| 563 | foam = emGetParent(foam); |
| 564 | } while (foam); |
| 565 | } |
| 566 | |
| 567 | /* |
| 568 | * Mark the arguments of a function call as escaping. |
| 569 | */ |
| 570 | localstatic void |
| 571 | emMarkCallArgs(Length argc, Foam *argv) |
| 572 | { |
| 573 | int i; |
| 574 | for(i=0; i<argc; i++) |
| 575 | emMarkLocal(argv[i]); |
| 576 | } |
| 577 | |
| 578 | /* |
| 579 | * Mark closure environments as escaping. |
| 580 | */ |
| 581 | localstatic void |
| 582 | emMarkClos(Foam clos) |
| 583 | { |
| 584 | Foam env = clos->foamClos.env; |
| 585 | |
| 586 | emMarkLocal(env); |
| 587 | } |
| 588 | |
| 589 | localstatic void |
| 590 | emMarkGener(Foam gener) |
| 591 | { |
| 592 | Foam env = gener->foamGener.env; |
| 593 | |
| 594 | emMarkLocal(env); |
| 595 | } |
| 596 | |
| 597 | /* |
| 598 | * Mark an array elt. |
| 599 | */ |
| 600 | localstatic void |
| 601 | emMarkAElt(Foam aelt) |
| 602 | { |
| 603 | Foam index = aelt->foamAElt.index; |
| 604 | Foam array = aelt->foamAElt.expr; |
| 605 | |
| 606 | foamDereferenceCast(array)while (((array)->hdr.tag) == FOAM_Cast) (array) = (array)-> foamCast.expr;; |
| 607 | |
| 608 | if (foamTag(array)((array)->hdr.tag) != FOAM_Loc) return; |
| 609 | if (!emIsSInt(index)(((index)->hdr.tag) == FOAM_SInt || (((index)->hdr.tag) == FOAM_Cast && ((index->foamCast.expr)->hdr.tag ) == FOAM_SInt))) |
| 610 | emMarkLocal(array); |
| 611 | else if (emSIntValue(index)(((index)->hdr.tag) == FOAM_SInt ? index->foamSInt.SIntData : index->foamCast.expr->foamSInt.SIntData) >= emUsageAliasing(array)->format) |
| 612 | emUsageAliasing(array)->format = emSIntValue(index)(((index)->hdr.tag) == FOAM_SInt ? index->foamSInt.SIntData : index->foamCast.expr->foamSInt.SIntData)+1; |
| 613 | return; |
| 614 | } |
| 615 | |
| 616 | /* |
| 617 | * Mark a raw-record as escaping |
| 618 | */ |
| 619 | localstatic void |
| 620 | emMarkRRElt(Foam rrelt) |
| 621 | { |
| 622 | emMarkLocal(rrelt->foamRRElt.data); |
| 623 | return; |
| 624 | } |
| 625 | |
| 626 | /* |
| 627 | * Mark a record element |
| 628 | * [actually just check that the record format is the same] |
| 629 | */ |
| 630 | localstatic void |
| 631 | emMarkRElt(Foam relt) |
| 632 | { |
| 633 | Foam var = relt->foamRElt.expr; |
| 634 | |
| 635 | if (!emCheckRElt(var, relt->foamRElt.format)) |
| 636 | emMarkLocal(var); |
| 637 | } |
| 638 | |
| 639 | localstatic Bool |
| 640 | emCheckRElt(Foam var, int fmt) |
| 641 | { |
| 642 | foamDereferenceCast(var)while (((var)->hdr.tag) == FOAM_Cast) (var) = (var)->foamCast .expr;; |
| 643 | |
| 644 | if (foamTag(var)((var)->hdr.tag) != FOAM_Loc) return false((int) 0); |
| 645 | |
| 646 | if (emUsageAliasing(var)->format == fmt) |
| 647 | return true1; |
| 648 | if (emUsageAliasing(var)->format == emptyFormatSlot4) |
| 649 | return true1; |
| 650 | if (foamEqual(emFormats[emUsageAliasing(var)->format], |
| 651 | emFormats[fmt])) |
| 652 | return true1; |
| 653 | |
| 654 | return false((int) 0); |
| 655 | } |
| 656 | |
| 657 | |
| 658 | /* |
| 659 | * compute the environment locals variable remap vector. |
| 660 | */ |
| 661 | localstatic void |
| 662 | emComputeRemap(Foam prog) |
| 663 | { |
| 664 | long i; |
| 665 | EmUsage env0 = &emLocalUsage[0]; |
| 666 | |
| 667 | emNumLocals = foamDDeclArgc(prog->foamProg.locals)(((prog->foamProg.locals)->hdr.argc) - (1)); |
| 668 | |
| 669 | |
| 670 | emNewLocals = listNil(Foam)((FoamList) 0); |
| 671 | if (env0->used == EM_NonEscapingEnv) |
| 672 | emMergeEnv((int)0,false((int) 0)); |
| 673 | if (env0->link && (env0->link->used == EM_NonEscapingEnv)) |
| 674 | emMergeEnv((int)0,true1); |
| 675 | |
| 676 | for (i =0 ; i < emOrigNumLocals ; i++) { |
| 677 | EmUsage alias; |
| 678 | EmUsage loc = emUsageFromLocalIndex(i); |
| 679 | |
| 680 | /* make locals for the heap allocated object */ |
| 681 | if (loc->used == EM_NonEscapingEnv) |
| 682 | emMergeEnv(i+1,false((int) 0)); |
| 683 | |
| 684 | /* make locals for an "alias" of a non-escaping object */ |
| 685 | alias = emUsageFromLocalIndexAliasing(i); |
| 686 | if (loc->link && (alias->used == EM_NonEscapingEnv)) |
| 687 | { |
| 688 | loc->link = alias; |
| 689 | |
| 690 | |
| 691 | /* Careful with (Env 0) remap */ |
| 692 | if (alias == env0) |
| 693 | emRemapEnv0(env0, loc); |
| 694 | else |
| 695 | emMergeEnv(i+1,true1); |
| 696 | } |
| 697 | } |
| 698 | |
| 699 | emMakeNewLocals(prog); |
| 700 | } |
| 701 | |
| 702 | |
| 703 | /* |
| 704 | * Ensure that locals for EElts of aliases of (Env 0) all map |
| 705 | * to the same local. We assume that all aliases of (Env 0) |
| 706 | * always point to (Env 0) and are never reassigned to other |
| 707 | * records of the same format. |
| 708 | */ |
| 709 | localstatic void |
| 710 | emRemapEnv0(EmUsage env0, EmUsage usage) |
| 711 | { |
| 712 | int size, format, i; |
| 713 | |
| 714 | |
| 715 | /* Check the format */ |
| 716 | format = env0->format; |
| 717 | |
| 718 | |
| 719 | /* Unused environments can't be emerged */ |
| 720 | if (format == emptyFormatSlot4) return; |
| 721 | |
| 722 | |
| 723 | /* How many elements are there in the environment? */ |
| 724 | size = foamDDeclArgc(emFormats[format])(((emFormats[format])->hdr.argc) - (1)); |
| 725 | |
| 726 | |
| 727 | /* Create a new remap vector */ |
| 728 | usage->remap = (Foam *)stoAlloc(OB_Other0, size*sizeof(Foam)); |
| 729 | |
| 730 | |
| 731 | /* Copy the mappings for (Env 0) */ |
| 732 | for (i = 0;i < size; i++) |
| 733 | usage->remap[i] = foamCopy(env0->remap[i]); |
| 734 | } |
| 735 | |
| 736 | |
| 737 | /* |
| 738 | * Create the locals for the nth local environment. |
| 739 | */ |
| 740 | localstatic void |
| 741 | emMergeEnv(int n, Bool isAlias) |
| 742 | { |
| 743 | int size, format, i; |
| 744 | Foam ddecl, type; |
| 745 | |
| 746 | type = isAlias ? emUsageFromLocalIndexAliasing(n-1)->type : |
| 747 | emLocalUsage[n].type; |
| 748 | |
| 749 | if (emIsArray(type)((type) && ((type)->hdr.tag) == FOAM_ANew)) { |
| 750 | emMergeArray(n, type, isAlias); |
| 751 | return; |
| 752 | } |
| 753 | |
| 754 | format = isAlias ? emUsageFromLocalIndexAliasing(n-1)->format : |
| 755 | emLocalUsage[n].format; |
| 756 | if (format == emptyFormatSlot4) return; |
| 757 | |
| 758 | ddecl = emFormats[format]; |
| 759 | size = foamDDeclArgc(ddecl)(((ddecl)->hdr.argc) - (1)); |
| 760 | emLocalUsage[n].remap = (Foam *)stoAlloc(OB_Other0, size*sizeof(Foam)); |
| 761 | |
| 762 | for(i=0; i < size; i++) { |
| 763 | Foam decl = foamCopy(ddecl->foamDDecl.argv[i]); |
| 764 | |
| 765 | emNewLocals = listCons(Foam)(Foam_listPointer->Cons)(decl, emNewLocals); |
| 766 | emLocalUsage[n].remap[i] = foamNewLoc(emNumLocals++)foamNew(FOAM_Loc, 1, (AInt)(emNumLocals++)); |
| 767 | emChanged = true1; |
| 768 | } |
| 769 | } |
| 770 | |
| 771 | /* |
| 772 | * Create locals for an array |
| 773 | */ |
| 774 | localstatic void |
| 775 | emMergeArray(int n, Foam type, Bool isAlias) |
| 776 | { |
| 777 | int size, i, eltType; |
| 778 | Foam decl; |
| 779 | |
| 780 | assert(foamTag(type) == FOAM_ANew)do { if (!(((type)->hdr.tag) == FOAM_ANew)) _do_assert(("foamTag(type) == FOAM_ANew" ),"of_emerg.c",780); } while (0); |
| 781 | assert(emIsSInt(type->foamANew.size))do { if (!((((type->foamANew.size)->hdr.tag) == FOAM_SInt || (((type->foamANew.size)->hdr.tag) == FOAM_Cast && ((type->foamANew.size->foamCast.expr)->hdr.tag) == FOAM_SInt )))) _do_assert(("emIsSInt(type->foamANew.size)"),"of_emerg.c" ,781); } while (0); |
| 782 | |
| 783 | size = emUsageFromLocalIndexAliasing(n-1)->format; |
| 784 | eltType = type->foamANew.eltType; |
| 785 | decl = foamNewDecl(eltType, strCopy(""), emptyFormatSlot)foamNew(FOAM_Decl,4,(AInt)(eltType),strCopy(""), (AInt) (0x7FFF ), 4); |
| 786 | |
| 787 | emLocalUsage[n].remap = (Foam *) stoAlloc(OB_Other0, size*sizeof(Foam)); |
| 788 | |
| 789 | for(i = 0; i < size; i++) { |
| 790 | emNewLocals = listCons(Foam)(Foam_listPointer->Cons)(foamCopy(decl), emNewLocals); |
| 791 | emLocalUsage[n].remap[i] = foamNewLoc(emNumLocals++)foamNew(FOAM_Loc, 1, (AInt)(emNumLocals++)); |
| 792 | emChanged = true1; |
| 793 | } |
| 794 | } |
| 795 | |
| 796 | /* |
| 797 | * Create new locals for the merged environment. |
| 798 | */ |
| 799 | localstatic void |
| 800 | emMakeNewLocals(Foam prog) |
| 801 | { |
| 802 | int i; |
| 803 | Foam newFoam, locals; |
| 804 | FoamList l; |
| 805 | |
| 806 | locals = prog->foamProg.locals; |
| 807 | newFoam = foamNewEmpty(FOAM_DDecl, emNumLocals + 1); |
| 808 | newFoam->foamDDecl.usage = locals->foamDDecl.usage; |
| 809 | |
| 810 | for(i=0; i<foamDDeclArgc(locals)(((locals)->hdr.argc) - (1)); i++) |
| 811 | newFoam->foamDDecl.argv[i] = locals->foamDDecl.argv[i]; |
| 812 | emNewLocals = listNReverse(Foam)(Foam_listPointer->NReverse)(emNewLocals); |
| 813 | for(l = emNewLocals, i = foamDDeclArgc(locals)(((locals)->hdr.argc) - (1)); l; l = cdr(l)((l)->rest), i++) |
| 814 | newFoam->foamDDecl.argv[i] = car(l)((l)->first); |
| 815 | stoFree(locals); |
| 816 | listFree(Foam)(Foam_listPointer->Free)(emNewLocals); |
| 817 | prog->foamProg.locals = newFoam; |
| 818 | } |
| 819 | |
| 820 | |
| 821 | /* |
| 822 | * Add a statement to the current function being merged. |
| 823 | */ |
| 824 | localstatic void |
| 825 | emAddStmt(Foam stmt) |
| 826 | { |
| 827 | emStmtList = listCons(Foam)(Foam_listPointer->Cons)(stmt, emStmtList); |
| 828 | } |
| 829 | |
| 830 | /* |
| 831 | * Transform the statements in a function body to merged environments. |
| 832 | */ |
| 833 | localstatic void |
| 834 | emMergeEnvs(Foam prog) |
| 835 | { |
| 836 | Foam body = prog->foamProg.body; |
| 837 | int argc = foamArgc(body)((body)->hdr.argc), i; |
| 838 | |
| 839 | assert(foamTag(body) == FOAM_Seq)do { if (!(((body)->hdr.tag) == FOAM_Seq)) _do_assert(("foamTag(body) == FOAM_Seq" ),"of_emerg.c",839); } while (0); |
| 840 | emStmtList = listNil(Foam)((FoamList) 0); |
| 841 | for(i=0; i<argc; i++) |
| 842 | emAddStmt(emMergeExpr(body->foamSeq.argv[i])); |
| 843 | foamFreeNode(body); |
| 844 | prog->foamProg.body = emNewBody(); |
| 845 | } |
| 846 | |
| 847 | /* |
| 848 | * Create a new function body from the statement list. |
| 849 | */ |
| 850 | localstatic Foam |
| 851 | emNewBody() |
| 852 | { |
| 853 | Foam newFoam; |
| 854 | FoamList l; |
| 855 | int i; |
| 856 | |
| 857 | newFoam = foamNewEmpty(FOAM_Seq, listLength(Foam)(Foam_listPointer->_Length)(emStmtList)); |
| 858 | emStmtList = listNReverse(Foam)(Foam_listPointer->NReverse)(emStmtList); |
| 859 | for(i=0, l = emStmtList; l; l = cdr(l)((l)->rest), i++) { |
| 860 | newFoam->foamSeq.argv[i] = car(l)((l)->first); |
| 861 | } |
| 862 | listFree(Foam)(Foam_listPointer->Free)(emStmtList); |
| 863 | return newFoam; |
| 864 | } |
| 865 | |
| 866 | /* |
| 867 | * transform a foam expression to merge non-escaping environments. |
| 868 | */ |
| 869 | localstatic Foam |
| 870 | emMergeExpr(Foam expr) |
| 871 | { |
| 872 | Foam nexpr = expr, env; |
| 873 | int index; |
| 874 | |
| 875 | foamIter(expr, arg, *arg = emMergeExpr(*arg)){ { String argf = (foamInfoTable [(int)(((expr)->hdr.tag)) -(int)FOAM_START]).argf; Length _i; for (_i = 0; _i < ((expr )->hdr.argc); _i++, argf++) { if (*argf == '*') argf--; if (*argf == 'C') { Foam *arg = (Foam *) ((expr)->foamGen.argv )+_i; { *arg = emMergeExpr(*arg); }; } } }; }; |
| 876 | |
| 877 | switch(foamTag(expr)((expr)->hdr.tag)) { |
| 878 | case FOAM_Set: |
| 879 | case FOAM_Def: |
| 880 | nexpr = emMergeDef(expr); |
| 881 | break; |
| 882 | case FOAM_EEnv: |
| 883 | nexpr = emMergeEEnv(expr); |
| 884 | break; |
| 885 | case FOAM_EElt: |
| 886 | index = expr->foamEElt.lex; |
| 887 | env = expr->foamEElt.ref; |
| 888 | nexpr = emMergeEElt(expr, env, index); |
| 889 | break; |
| 890 | case FOAM_RElt: |
| 891 | index = expr->foamRElt.field; |
| 892 | env = expr->foamRElt.expr; |
| 893 | nexpr = emMergeRElt(expr, env, index); |
| 894 | break; |
| 895 | case FOAM_Return: |
| 896 | nexpr = emMergeReturn(expr); |
| 897 | break; |
| 898 | case FOAM_Yield: |
| 899 | nexpr = emMergeYield(expr); |
| 900 | break; |
| 901 | case FOAM_AElt: |
| 902 | nexpr = emMergeAElt(expr); |
| 903 | break; |
| 904 | case FOAM_Lex: |
| 905 | nexpr = emMergeLex(expr); |
| 906 | break; |
| 907 | case FOAM_Free: |
| 908 | nexpr = emMergeFree(expr); |
| 909 | break; |
| 910 | default: |
| 911 | break; |
| 912 | } |
| 913 | /* if (expr != nexpr) foamFreeNode(expr); */ |
| 914 | return nexpr; |
| 915 | } |
| 916 | |
| 917 | |
| 918 | /* |
| 919 | * Transform an assignment. |
| 920 | */ |
| 921 | localstatic Foam |
| 922 | emMergeDef(Foam def) |
| 923 | { |
| 924 | Foam lhs = def->foamDef.lhs; |
| 925 | Foam rhs = def->foamDef.rhs; |
| 926 | FoamTag ltag = foamTag(lhs)((lhs)->hdr.tag), rtag = foamTag(rhs)((rhs)->hdr.tag); |
| 927 | |
| 928 | if (rtag == FOAM_PushEnv) { |
| 929 | emSetParent(lhs, rhs->foamPushEnv.parent); |
| 930 | return def; |
| 931 | } |
| 932 | |
| 933 | if (rtag == FOAM_Loc && ltag == FOAM_Loc && emOldLocal(rhs)(((rhs)->hdr.tag) != FOAM_Loc || ((rhs)->foamLoc.index < emOrigNumLocals)) && emOldLocal(lhs)(((lhs)->hdr.tag) != FOAM_Loc || ((lhs)->foamLoc.index < emOrigNumLocals))) { |
| 934 | if (emUsage(lhs)->remap) { |
| 935 | if (emUsage(rhs)->remap == 0) { |
| 936 | assert(0 && "lhs is remapped and rhs isn't")do { if (!(0 && "lhs is remapped and rhs isn't")) _do_assert (("0 && \"lhs is remapped and rhs isn't\""),"of_emerg.c" ,936); } while (0); |
| 937 | } |
| 938 | } |
| 939 | else { |
| 940 | if (emUsage(rhs)->remap) { |
| 941 | assert (0 && "rhs is remapped and lhs isn't")do { if (!(0 && "rhs is remapped and lhs isn't")) _do_assert (("0 && \"rhs is remapped and lhs isn't\""),"of_emerg.c" ,941); } while (0); |
| 942 | } |
| 943 | } |
| 944 | } |
| 945 | |
| 946 | if (ltag == FOAM_Loc) { |
| 947 | if (!emOldLocal(lhs)(((lhs)->hdr.tag) != FOAM_Loc || ((lhs)->foamLoc.index < emOrigNumLocals))) return def; |
| 948 | return emNewEnvSet(def, lhs, rhs); |
| 949 | } |
| 950 | |
| 951 | return def; |
| 952 | } |
| 953 | |
| 954 | /* |
| 955 | * Transform an assignment. |
| 956 | */ |
| 957 | localstatic Foam |
| 958 | emNewEnvSet(Foam def, Foam lhs, Foam rhs) |
| 959 | { |
| 960 | int format, i, size, rtag; |
| 961 | Foam ddecl; |
| 962 | EmUsage aliasLhs; |
| 963 | Bool isArray; |
| 964 | FoamTag arrType = FOAM_NOp; /* Quit warnings */ |
| 965 | |
| 966 | assert (emOldLocal(lhs))do { if (!((((lhs)->hdr.tag) != FOAM_Loc || ((lhs)->foamLoc .index < emOrigNumLocals)))) _do_assert(("emOldLocal(lhs)" ),"of_emerg.c",966); } while (0); |
| 967 | |
| 968 | foamDereferenceCast(rhs)while (((rhs)->hdr.tag) == FOAM_Cast) (rhs) = (rhs)->foamCast .expr;; |
| 969 | |
| 970 | rtag = foamTag(rhs)((rhs)->hdr.tag); |
| 971 | |
| 972 | aliasLhs = emUsageAliasing(lhs); |
| 973 | |
| 974 | |
| 975 | if (aliasLhs->used != EM_NonEscapingEnv) return def; |
| 976 | |
| 977 | /* we are setting a non-escaped or an alias */ |
| 978 | |
| 979 | format = aliasLhs->format; |
| 980 | if (emIsArray(aliasLhs->type)((aliasLhs->type) && ((aliasLhs->type)->hdr. tag) == FOAM_ANew)) { |
| 981 | isArray = true1; |
| 982 | size = format; |
| 983 | arrType = (aliasLhs->type)->foamANew.eltType; |
| 984 | } |
| 985 | else { |
| 986 | isArray = false((int) 0); |
| 987 | ddecl = emFormats[format]; |
| 988 | size = foamDDeclArgc(ddecl)(((ddecl)->hdr.argc) - (1)); |
| 989 | } |
| 990 | |
| 991 | if (rtag == FOAM_Loc && emOldLocal(rhs)(((rhs)->hdr.tag) != FOAM_Loc || ((rhs)->foamLoc.index < emOrigNumLocals)) && emUsage(rhs)->remap) { |
| 992 | for(i=0; i<size; i++) |
| 993 | emAddStmt(foamNewSet(foamCopy(emUsage(lhs)-> remap[i]),foamNew(FOAM_Set, 2, foamCopy(emUsage(lhs)-> remap[i]), foamCopy (emUsage(rhs)-> remap[i])) |
| 994 | foamCopy(emUsage(rhs)-> remap[i]))foamNew(FOAM_Set, 2, foamCopy(emUsage(lhs)-> remap[i]), foamCopy (emUsage(rhs)-> remap[i]))); |
| 995 | emChanged = true1; |
| 996 | return foamNewNOp()foamNew(FOAM_NOp, (int) 0); |
| 997 | } |
| 998 | if ( rtag == FOAM_PushEnv || rtag == FOAM_Env || rtag == FOAM_RNew || rtag == FOAM_ANew) { |
| 999 | assert(rtag != FOAM_PushEnv)do { if (!(rtag != FOAM_PushEnv)) _do_assert(("rtag != FOAM_PushEnv" ),"of_emerg.c",999); } while (0); /* has been dealt in emMergeDef */ |
| 1000 | if (emUsage(lhs)->used == EM_NonEscapingEnv) return foamNewNOp()foamNew(FOAM_NOp, (int) 0); |
| 1001 | return def; |
| 1002 | } |
| 1003 | |
| 1004 | emAddStmt(def); |
| 1005 | |
| 1006 | if (isArray) { |
| 1007 | for(i=0; i<size; i++) |
| 1008 | emAddStmt(foamNewSet(foamCopy(emUsage(lhs)->remap[i]),foamNew(FOAM_Set, 2, foamCopy(emUsage(lhs)->remap[i]), foamNew (FOAM_AElt,3,(AInt)(arrType),foamNew(FOAM_SInt, 1, (AInt)(i)) ,foamCopy(lhs))) |
| 1009 | foamNewAElt(arrType,foamNew(FOAM_Set, 2, foamCopy(emUsage(lhs)->remap[i]), foamNew (FOAM_AElt,3,(AInt)(arrType),foamNew(FOAM_SInt, 1, (AInt)(i)) ,foamCopy(lhs))) |
| 1010 | foamNewSInt(i),foamNew(FOAM_Set, 2, foamCopy(emUsage(lhs)->remap[i]), foamNew (FOAM_AElt,3,(AInt)(arrType),foamNew(FOAM_SInt, 1, (AInt)(i)) ,foamCopy(lhs))) |
| 1011 | foamCopy(lhs)))foamNew(FOAM_Set, 2, foamCopy(emUsage(lhs)->remap[i]), foamNew (FOAM_AElt,3,(AInt)(arrType),foamNew(FOAM_SInt, 1, (AInt)(i)) ,foamCopy(lhs)))); |
| 1012 | |
| 1013 | } |
| 1014 | else { |
| 1015 | Foam decl = emUsage(lhs)->decl; |
| 1016 | Foam typedLhs; |
| 1017 | typedLhs = (decl->foamDecl.type == FOAM_Rec) ? foamCopy(lhs) : foamNewCast(FOAM_Rec, foamCopy(lhs))foamNew(FOAM_Cast, 2, FOAM_Rec, foamCopy(lhs)); |
| 1018 | for(i=0; i<size; i++) |
| 1019 | emAddStmt(foamNewSet(foamCopy(emUsage(lhs)->remap[i]),foamNew(FOAM_Set, 2, foamCopy(emUsage(lhs)->remap[i]), foamNew (FOAM_RElt,3,(AInt)(format),foamCopy(typedLhs),(AInt)(i))) |
| 1020 | foamNewRElt(format,foamNew(FOAM_Set, 2, foamCopy(emUsage(lhs)->remap[i]), foamNew (FOAM_RElt,3,(AInt)(format),foamCopy(typedLhs),(AInt)(i))) |
| 1021 | foamCopy(typedLhs), i))foamNew(FOAM_Set, 2, foamCopy(emUsage(lhs)->remap[i]), foamNew (FOAM_RElt,3,(AInt)(format),foamCopy(typedLhs),(AInt)(i)))); |
| 1022 | foamFree(typedLhs); |
| 1023 | } |
| 1024 | |
| 1025 | emChanged = true1; |
| 1026 | return foamNewNOp()foamNew(FOAM_NOp, (int) 0); |
| 1027 | } |
| 1028 | |
| 1029 | |
| 1030 | /* |
| 1031 | * Transfor a record elt. |
| 1032 | */ |
| 1033 | localstatic Foam |
| 1034 | emMergeRElt(Foam expr, Foam env, int index) |
| 1035 | { |
| 1036 | foamDereferenceCast(env)while (((env)->hdr.tag) == FOAM_Cast) (env) = (env)->foamCast .expr;; |
| 1037 | |
| 1038 | if (foamTag(env)((env)->hdr.tag) != FOAM_Loc) return expr; |
| 1039 | |
| 1040 | if (!emOldLocal(env)(((env)->hdr.tag) != FOAM_Loc || ((env)->foamLoc.index < emOrigNumLocals))) return expr; |
| 1041 | |
| 1042 | if (emUsageAliasing(env)->used != EM_NonEscapingEnv) return expr; |
| 1043 | |
| 1044 | emChanged = true1; |
| 1045 | |
| 1046 | /* assert (expr->foamRElt.format == emUsageAliasing(env)->format); |
| 1047 | no, because there may be a cast so the records don't have to be identical |
| 1048 | */ |
| 1049 | assert (emUsage(env)->remap)do { if (!(emUsage(env)->remap)) _do_assert(("emUsage(env)->remap" ),"of_emerg.c",1049); } while (0); |
| 1050 | |
| 1051 | return foamCopy(emUsage(env)->remap[index]); |
| 1052 | } |
| 1053 | |
| 1054 | /* |
| 1055 | * transform an environment elt. |
| 1056 | */ |
| 1057 | localstatic Foam |
| 1058 | emMergeEElt(Foam eelt, Foam env, int index) |
| 1059 | { |
| 1060 | int format = eelt->foamEElt.env; |
| 1061 | int level = eelt->foamEElt.level; |
| 1062 | int oindex = eelt->foamEElt.lex; |
| 1063 | EmUsage usage; |
| 1064 | |
| 1065 | foamDereferenceCast(env)while (((env)->hdr.tag) == FOAM_Cast) (env) = (env)->foamCast .expr;; |
| 1066 | |
| 1067 | env = emGetNthParent(env, &level); |
| 1068 | if (level == eelt->foamEElt.level && level > 0) |
| 1069 | return eelt; |
| 1070 | |
| 1071 | emChanged = true1; |
| 1072 | |
| 1073 | if (level > 0) |
| 1074 | return foamNewEElt(format, foamCopy(env), level, oindex)foamNew(FOAM_EElt,4,(AInt)(format),foamCopy(env),(AInt)(level ),(AInt)(oindex)); |
| 1075 | |
| 1076 | if (!emIsMergeable(env)(((env)->hdr.tag) == FOAM_Loc || (((env)->hdr.tag) == FOAM_Env && (env)->foamEnv.level == 0))) |
| 1077 | return foamNewEElt(format, foamCopy(env), level, oindex)foamNew(FOAM_EElt,4,(AInt)(format),foamCopy(env),(AInt)(level ),(AInt)(oindex)); |
| 1078 | |
| 1079 | if (!emOldLocal(env)(((env)->hdr.tag) != FOAM_Loc || ((env)->foamLoc.index < emOrigNumLocals))) |
| 1080 | return foamNewEElt(format, foamCopy(env), level, oindex)foamNew(FOAM_EElt,4,(AInt)(format),foamCopy(env),(AInt)(level ),(AInt)(oindex)); |
| 1081 | |
| 1082 | usage = emUsageAliasing(env); |
| 1083 | |
| 1084 | if (usage->used != EM_NonEscapingEnv) |
| 1085 | return foamNewEElt(format, foamCopy(env), level, oindex)foamNew(FOAM_EElt,4,(AInt)(format),foamCopy(env),(AInt)(level ),(AInt)(oindex)); |
| 1086 | |
| 1087 | assert(emUsage(env)->remap)do { if (!(emUsage(env)->remap)) _do_assert(("emUsage(env)->remap" ),"of_emerg.c",1087); } while (0); |
| 1088 | return foamCopy(emUsage(env)->remap[index]); |
| 1089 | } |
| 1090 | |
| 1091 | localstatic Foam |
| 1092 | emMergeLex(Foam lex) |
| 1093 | { |
| 1094 | if (lex->foamLex.level != 0) |
| 1095 | return lex; |
| 1096 | if (emLocalUsage->used != EM_NonEscapingEnv) |
| 1097 | return lex; |
| 1098 | emChanged = true1; |
| 1099 | return foamCopy(emLocalUsage->remap[lex->foamLex.index]); |
| 1100 | } |
| 1101 | |
| 1102 | /* |
| 1103 | * Transform an environment parent instruction. |
| 1104 | */ |
| 1105 | localstatic Foam |
| 1106 | emMergeEEnv(Foam eenv) |
| 1107 | { |
| 1108 | Foam env = eenv->foamEEnv.env; |
| 1109 | int level = eenv->foamEEnv.level; |
| 1110 | |
| 1111 | foamDereferenceCast(env)while (((env)->hdr.tag) == FOAM_Cast) (env) = (env)->foamCast .expr;; |
| 1112 | |
| 1113 | env = emGetNthParent(env, &level); |
| 1114 | if (level == eenv->foamEEnv.level) |
| 1115 | return eenv; |
| 1116 | |
| 1117 | emChanged = true1; |
| 1118 | env = foamCopy(env); |
| 1119 | assert((int)level >= 0)do { if (!((int)level >= 0)) _do_assert(("(int)level >= 0" ),"of_emerg.c",1119); } while (0); /* bug 1168 */ |
| 1120 | return level == 0 ? env : foamNewEEnv(level, env)foamNew(FOAM_EEnv, 2, (AInt)(level), env); |
| 1121 | } |
| 1122 | |
| 1123 | /* |
| 1124 | * Remove the `(Free x)' statement if x is no more heap-allocated. |
| 1125 | */ |
| 1126 | localstatic Foam |
| 1127 | emMergeFree(Foam foam) |
| 1128 | { |
| 1129 | Foam expr, newFoam; |
| 1130 | |
| 1131 | expr = foam->foamFree.place; |
| 1132 | |
| 1133 | foamDereferenceCast(expr)while (((expr)->hdr.tag) == FOAM_Cast) (expr) = (expr)-> foamCast.expr;; |
| 1134 | |
| 1135 | if (foamTag(expr)((expr)->hdr.tag) != FOAM_Loc) return foam; |
| 1136 | |
| 1137 | if (!emOldLocal(expr)(((expr)->hdr.tag) != FOAM_Loc || ((expr)->foamLoc.index < emOrigNumLocals))) return foam; |
| 1138 | if (emUsageAliasing(expr)->used != EM_NonEscapingEnv) return foam; |
| 1139 | |
| 1140 | newFoam = foamNewNOp()foamNew(FOAM_NOp, (int) 0); |
| 1141 | |
| 1142 | return newFoam; |
| 1143 | } |
| 1144 | |
| 1145 | /* |
| 1146 | * create a new record object for returning. |
| 1147 | */ |
| 1148 | localstatic Foam |
| 1149 | emMergeReturn(Foam ret) |
| 1150 | { |
| 1151 | int size, format, i; |
| 1152 | Foam newFoam, expr; |
| 1153 | |
| 1154 | foamDereferenceCast(ret)while (((ret)->hdr.tag) == FOAM_Cast) (ret) = (ret)->foamCast .expr;; |
| 1155 | |
| 1156 | expr = ret->foamReturn.value; |
| 1157 | if (foamTag(expr)((expr)->hdr.tag) != FOAM_Loc) return ret; |
| 1158 | |
| 1159 | if (!emOldLocal(expr)(((expr)->hdr.tag) != FOAM_Loc || ((expr)->foamLoc.index < emOrigNumLocals))) return ret; |
| 1160 | if (emUsageAliasing(expr)->used != EM_NonEscapingEnv) return ret; |
| 1161 | |
| 1162 | format = emUsageAliasing(expr)->format; |
| 1163 | size = foamDDeclArgc(emFormats[format])(((emFormats[format])->hdr.argc) - (1)); |
| 1164 | newFoam = foamNewEmpty(FOAM_Rec, size+1); |
| 1165 | newFoam->foamRec.format = format; |
| 1166 | for(i=0; i<size; i++) |
| 1167 | newFoam->foamRec.eltv[i+1] = |
| 1168 | foamCopy(emUsageAliasing(expr)->remap[i]); |
| 1169 | emChanged = true1; |
| 1170 | |
| 1171 | return newFoam; |
| 1172 | } |
| 1173 | |
| 1174 | /* |
| 1175 | * create a new record object for yield |
| 1176 | */ |
| 1177 | localstatic Foam |
| 1178 | emMergeYield(Foam yld) |
| 1179 | { |
| 1180 | int size, format, i; |
| 1181 | Foam newFoam, expr; |
| 1182 | |
| 1183 | foamDereferenceCast(yld)while (((yld)->hdr.tag) == FOAM_Cast) (yld) = (yld)->foamCast .expr;; |
| 1184 | |
| 1185 | expr = yld->foamYield.value; |
| 1186 | if (foamTag(expr)((expr)->hdr.tag) != FOAM_Loc) return yld; |
| 1187 | |
| 1188 | if (!emOldLocal(expr)(((expr)->hdr.tag) != FOAM_Loc || ((expr)->foamLoc.index < emOrigNumLocals))) return yld; |
| 1189 | if (emUsageAliasing(expr)->used != EM_NonEscapingEnv) return yld; |
| 1190 | |
| 1191 | format = emUsageAliasing(expr)->format; |
| 1192 | size = foamDDeclArgc(emFormats[format])(((emFormats[format])->hdr.argc) - (1)); |
| 1193 | newFoam = foamNewEmpty(FOAM_Rec, size+1); |
| 1194 | newFoam->foamRec.format = format; |
| 1195 | for(i=0; i<size; i++) |
| 1196 | newFoam->foamRec.eltv[i+1] = |
| 1197 | foamCopy(emUsageAliasing(expr)->remap[i]); |
| 1198 | emChanged = true1; |
| 1199 | |
| 1200 | return newFoam; |
| 1201 | } |
| 1202 | |
| 1203 | /* |
| 1204 | * Merge an array reference. |
| 1205 | */ |
| 1206 | localstatic Foam |
| 1207 | emMergeAElt(Foam aelt) |
| 1208 | { |
| 1209 | Foam index = aelt->foamAElt.index; |
| 1210 | Foam array = aelt->foamAElt.expr; |
| 1211 | EmUsage usage; |
| 1212 | int i; |
| 1213 | |
| 1214 | foamDereferenceCast(array)while (((array)->hdr.tag) == FOAM_Cast) (array) = (array)-> foamCast.expr;; |
| 1215 | |
| 1216 | if (foamTag(array)((array)->hdr.tag) != FOAM_Loc) return aelt; |
| 1217 | if (!emOldLocal(array)(((array)->hdr.tag) != FOAM_Loc || ((array)->foamLoc.index < emOrigNumLocals))) return aelt; |
| 1218 | |
| 1219 | usage = emUsageAliasing(array); |
| 1220 | if (usage->used != EM_NonEscapingEnv) return aelt; |
| 1221 | |
| 1222 | assert (emIsSInt(index))do { if (!((((index)->hdr.tag) == FOAM_SInt || (((index)-> hdr.tag) == FOAM_Cast && ((index->foamCast.expr)-> hdr.tag) == FOAM_SInt)))) _do_assert(("emIsSInt(index)"),"of_emerg.c" ,1222); } while (0); |
| 1223 | i = emSIntValue(index)(((index)->hdr.tag) == FOAM_SInt ? index->foamSInt.SIntData : index->foamCast.expr->foamSInt.SIntData); |
| 1224 | return foamCopy(usage->remap[i]); |
| 1225 | } |
| 1226 | |
| 1227 | /* |
| 1228 | * Return the representative usage descriptor for an environment. |
| 1229 | */ |
| 1230 | localstatic EmUsage |
| 1231 | emUsageAliasing(Foam foam) |
| 1232 | { |
| 1233 | EmUsage orig, val; |
| 1234 | Bool isCircular ; |
| 1235 | |
| 1236 | isCircular = 0; |
| 1237 | |
| 1238 | if (foamTag(foam)((foam)->hdr.tag) == FOAM_Loc) |
| 1239 | val = emUsageFromLocalIndex(foam->foamLoc.index); |
| 1240 | else { |
| 1241 | assert(foamTag(foam) == FOAM_Env)do { if (!(((foam)->hdr.tag) == FOAM_Env)) _do_assert(("foamTag(foam) == FOAM_Env" ),"of_emerg.c",1241); } while (0); |
| 1242 | val = emLocalUsage; /* for Env(0) */ |
| 1243 | } |
| 1244 | |
| 1245 | orig = val; |
| 1246 | while (val->link) { |
| 1247 | if (val->mark == 1) { |
| 1248 | isCircular =1 ; /* oops , must be a circular link */ |
| 1249 | break; |
| 1250 | } |
| 1251 | val->mark = 1; |
| 1252 | val = val->link; |
| 1253 | |
| 1254 | } |
| 1255 | while (orig->link) { |
| 1256 | if (orig->mark == 0) break; |
| 1257 | orig->mark = 0; |
| 1258 | orig = orig->link; |
| 1259 | } |
| 1260 | return val; |
| 1261 | } |
| 1262 | |
| 1263 | |
| 1264 | localstatic EmUsage |
| 1265 | emUsage(Foam foam) |
| 1266 | { |
| 1267 | assert(foam!=NULL)do { if (!(foam!=((void*)0))) _do_assert(("foam!=NULL"),"of_emerg.c" ,1267); } while (0); |
| 1268 | if (foamTag(foam)((foam)->hdr.tag) == FOAM_Loc) |
| 1269 | return emUsageFromLocalIndex(foam->foamLoc.index); |
| 1270 | else { |
| 1271 | assert(foamTag(foam) == FOAM_Env)do { if (!(((foam)->hdr.tag) == FOAM_Env)) _do_assert(("foamTag(foam) == FOAM_Env" ),"of_emerg.c",1271); } while (0); |
| 1272 | return emLocalUsage; /* for Env(0) */ |
| 1273 | } |
| 1274 | } |
| 1275 | |
| 1276 | |
| 1277 | localstatic EmUsage |
| 1278 | emUsageFromLocalIndexAliasing(long index) |
| 1279 | { |
| 1280 | EmUsage orig, val; |
| 1281 | Bool isCircular ; |
| 1282 | |
| 1283 | isCircular = 0; |
Value stored to 'isCircular' is never read | |
| 1284 | |
| 1285 | val = emUsageFromLocalIndex(index); |
| 1286 | |
| 1287 | orig = val; |
| 1288 | /* follow the links all the way , marking as we go */ |
| 1289 | while (val->link) { |
| 1290 | if (val->mark == 1) { |
| 1291 | isCircular =1 ; /* oops , must be a circular link */ |
| 1292 | break; |
| 1293 | } |
| 1294 | val->mark = 1; |
| 1295 | val = val->link; |
| 1296 | |
| 1297 | } |
| 1298 | /* restore the marks */ |
| 1299 | while (orig->link) { |
| 1300 | if (orig->mark == 0) break; |
| 1301 | orig->mark = 0; |
| 1302 | orig = orig->link; |
| 1303 | } |
| 1304 | return val; |
| 1305 | } |
| 1306 | |
| 1307 | localstatic EmUsage |
| 1308 | emUsageFromLocalIndex(long index) |
| 1309 | { |
| 1310 | /* Loc 0 => index 0 => array[1] */ |
| 1311 | return &(emLocalUsage[index + 1]); |
| 1312 | } |
| 1313 | |
| 1314 | localstatic long |
| 1315 | emIndexFromUsage(EmUsage u) |
| 1316 | { |
| 1317 | return (u - &emLocalUsage[1]); |
| 1318 | } |
| 1319 | |
| 1320 | Table emParentTable; |
| 1321 | |
| 1322 | /* |
| 1323 | * Create a hash table for tracking environment parents. |
| 1324 | */ |
| 1325 | localstatic void |
| 1326 | emNewParentTable() |
| 1327 | { |
| 1328 | emParentTable = tblNew((TblHashFun) foamHash, (TblEqFun) foamEqual); |
| 1329 | } |
| 1330 | |
| 1331 | /* |
| 1332 | * Free the table. |
| 1333 | */ |
| 1334 | localstatic void |
| 1335 | emFreeParentTable() |
| 1336 | { |
| 1337 | tblFree(emParentTable); |
| 1338 | } |
| 1339 | |
| 1340 | /* |
| 1341 | * Set an environment's parent |
| 1342 | */ |
| 1343 | localstatic void |
| 1344 | emSetParent(Foam child, Foam parent) |
| 1345 | { |
| 1346 | Foam newParent; |
| 1347 | newParent = emUnEEnv(parent); |
| 1348 | |
| 1349 | /* Strip aliases out where poss */ |
| 1350 | if (parent != newParent) { |
| 1351 | if (DEBUG(emerge)emergeDebug) { |
| 1352 | fprintf(dbOut, "child:"); foamWrSExpr(dbOut, child,SXRW_Default((1L<<1) | (1L<<3))); |
| 1353 | fprintf(dbOut, "parent:"); foamWrSExpr(dbOut, parent,SXRW_Default((1L<<1) | (1L<<3))); |
| 1354 | fprintf(dbOut, "newParent:"); foamWrSExpr(dbOut, newParent,SXRW_Default((1L<<1) | (1L<<3))); |
| 1355 | } |
| 1356 | emChanged = true1; |
| 1357 | } |
| 1358 | |
| 1359 | tblSetElt(emParentTable, (TblKey) child, (TblElt) newParent); |
| 1360 | } |
| 1361 | |
| 1362 | |
| 1363 | localstatic Foam |
| 1364 | emUnEEnv(Foam foam) |
| 1365 | { |
| 1366 | int lvl; |
| 1367 | Foam env; |
| 1368 | |
| 1369 | if (foamTag(foam)((foam)->hdr.tag) != FOAM_EEnv) |
| 1370 | return foam; |
| 1371 | |
| 1372 | lvl = foam->foamEEnv.level; |
| 1373 | env = foam->foamEEnv.env; |
| 1374 | |
| 1375 | while (lvl > 0) { |
| 1376 | Foam nextEnv = emGetParent(env); |
| 1377 | if (!nextEnv) |
| 1378 | return foam; |
| 1379 | env = nextEnv; |
| 1380 | lvl--; |
| 1381 | } |
| 1382 | return env; |
| 1383 | } |
| 1384 | |
| 1385 | /* |
| 1386 | * Query an environment's parent. |
| 1387 | */ |
| 1388 | localstatic Foam |
| 1389 | emGetParent(Foam child) |
| 1390 | { |
| 1391 | return (Foam) tblElt(emParentTable, (TblKey) child, (TblElt) 0); |
| 1392 | } |
| 1393 | |
| 1394 | localstatic Foam |
| 1395 | emGetNthParent(Foam child, int *level) |
| 1396 | { |
| 1397 | Foam parent; |
| 1398 | |
| 1399 | while (*level > 0 && (parent = emGetParent(child)) != NULL((void*)0)) { |
| 1400 | child = parent; |
| 1401 | *level -= 1; |
| 1402 | } |
| 1403 | |
| 1404 | return child; |
| 1405 | } |
| 1406 | |
| 1407 | |
| 1408 | localstatic void |
| 1409 | emCleanTypeUsage() |
| 1410 | { |
| 1411 | int i; |
| 1412 | for (i = 0 ; i < emOrigNumLocals ;i++) { |
| 1413 | emUsageFromLocalIndex((long)i)->type = (Foam) 0 ; |
| 1414 | } |
| 1415 | |
| 1416 | } |
| 1417 | |
| 1418 | |
| 1419 | localstatic void |
| 1420 | emNormaliseUsage() |
| 1421 | { |
| 1422 | int i; |
| 1423 | emergeDEBUGif (!emergeDebug) { } else afprintf(dbOut, "--------------------\n"); |
| 1424 | for (i = 0 ; i < emOrigNumLocals ;i++){ |
| 1425 | EmUsage use = emUsageFromLocalIndex((long)i); |
| 1426 | |
| 1427 | /* If non-escaping and not root link ... */ |
| 1428 | if (use->link) { |
| 1429 | if (use->link->used != EM_NonEscapingEnv) { |
| 1430 | /* assert(use->link->link == 0); */ |
| 1431 | use->link = 0; /* MUST clobber this */ |
| 1432 | } |
| 1433 | else { |
| 1434 | use->used = EM_AliasNonEsc; |
| 1435 | assert(use->remap)do { if (!(use->remap)) _do_assert(("use->remap"),"of_emerg.c" ,1435); } while (0); |
| 1436 | emergeDEBUGif (!emergeDebug) { } else afprintf(dbOut, "%3ld is aliased to %3ld\n", |
| 1437 | emIndexFromUsage(use), emIndexFromUsage(use->link)); |
| 1438 | } |
| 1439 | |
| 1440 | } |
| 1441 | } |
| 1442 | |
| 1443 | } |
| 1444 | |
| 1445 | |
| 1446 | |
| 1447 | localstatic void |
| 1448 | emCopyUsedTagsTo(EmUsageState * arr) |
| 1449 | { |
| 1450 | int i; |
| 1451 | for (i = 0 ; i < (emOrigNumLocals + 1) ;i++){ |
| 1452 | arr[i] = emLocalUsage[i].used; |
| 1453 | } |
| 1454 | } |
| 1455 | |
| 1456 | localstatic Bool |
| 1457 | emUsedTagsChanged(EmUsageState *arr) |
| 1458 | { |
| 1459 | int i; |
| 1460 | for (i = 0 ; i < (emOrigNumLocals + 1) ;i++){ |
| 1461 | if (arr[i] != emLocalUsage[i].used) { |
| 1462 | emergeDEBUGif (!emergeDebug) { } else afprintf(dbOut, "emLocalUsage[%3d].used has changed!\n", i); |
| 1463 | return true1; |
| 1464 | } |
| 1465 | } |
| 1466 | return false((int) 0); |
| 1467 | } |
| 1468 | |
| 1469 |