Ben Murdoch | 8b112d2 | 2011-06-08 16:22:53 +0100 | [diff] [blame] | 1 | // Copyright 2011 the V8 project authors. All rights reserved. |
| 2 | // Redistribution and use in source and binary forms, with or without |
| 3 | // modification, are permitted provided that the following conditions are |
| 4 | // met: |
| 5 | // |
| 6 | // * Redistributions of source code must retain the above copyright |
| 7 | // notice, this list of conditions and the following disclaimer. |
| 8 | // * Redistributions in binary form must reproduce the above |
| 9 | // copyright notice, this list of conditions and the following |
| 10 | // disclaimer in the documentation and/or other materials provided |
| 11 | // with the distribution. |
| 12 | // * Neither the name of Google Inc. nor the names of its |
| 13 | // contributors may be used to endorse or promote products derived |
| 14 | // from this software without specific prior written permission. |
| 15 | // |
| 16 | // THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS |
| 17 | // "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT |
| 18 | // LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR |
| 19 | // A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT |
| 20 | // OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, |
| 21 | // SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT |
| 22 | // LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, |
| 23 | // DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY |
| 24 | // THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT |
| 25 | // (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE |
| 26 | // OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. |
| 27 | |
| 28 | // This is clang plugin used by gcmole tool. See README for more details. |
| 29 | |
| 30 | #include "clang/AST/AST.h" |
| 31 | #include "clang/AST/ASTConsumer.h" |
| 32 | #include "clang/AST/Mangle.h" |
| 33 | #include "clang/AST/RecursiveASTVisitor.h" |
| 34 | #include "clang/AST/StmtVisitor.h" |
| 35 | #include "clang/Frontend/FrontendPluginRegistry.h" |
| 36 | #include "clang/Frontend/CompilerInstance.h" |
| 37 | #include "llvm/Support/raw_ostream.h" |
| 38 | |
| 39 | #include <bitset> |
| 40 | #include <fstream> |
| 41 | #include <iostream> |
| 42 | #include <map> |
| 43 | #include <set> |
| 44 | #include <stack> |
| 45 | |
| 46 | namespace { |
| 47 | |
| 48 | typedef std::string MangledName; |
| 49 | typedef std::set<MangledName> CalleesSet; |
| 50 | |
| 51 | static bool GetMangledName(clang::MangleContext* ctx, |
| 52 | const clang::NamedDecl* decl, |
| 53 | MangledName* result) { |
Ben Murdoch | b8a8cc1 | 2014-11-26 15:28:44 +0000 | [diff] [blame] | 54 | if (!llvm::isa<clang::CXXConstructorDecl>(decl) && |
| 55 | !llvm::isa<clang::CXXDestructorDecl>(decl)) { |
Ben Murdoch | 8b112d2 | 2011-06-08 16:22:53 +0100 | [diff] [blame] | 56 | llvm::SmallVector<char, 512> output; |
| 57 | llvm::raw_svector_ostream out(output); |
| 58 | ctx->mangleName(decl, out); |
| 59 | *result = out.str().str(); |
| 60 | return true; |
| 61 | } |
| 62 | |
| 63 | return false; |
| 64 | } |
| 65 | |
| 66 | |
| 67 | static bool InV8Namespace(const clang::NamedDecl* decl) { |
| 68 | return decl->getQualifiedNameAsString().compare(0, 4, "v8::") == 0; |
| 69 | } |
| 70 | |
| 71 | |
Ben Murdoch | 3ef787d | 2012-04-12 10:51:47 +0100 | [diff] [blame] | 72 | static std::string EXTERNAL("EXTERNAL"); |
| 73 | static std::string STATE_TAG("enum v8::internal::StateTag"); |
| 74 | |
| 75 | static bool IsExternalVMState(const clang::ValueDecl* var) { |
| 76 | const clang::EnumConstantDecl* enum_constant = |
Ben Murdoch | b8a8cc1 | 2014-11-26 15:28:44 +0000 | [diff] [blame] | 77 | llvm::dyn_cast<clang::EnumConstantDecl>(var); |
Ben Murdoch | 3ef787d | 2012-04-12 10:51:47 +0100 | [diff] [blame] | 78 | if (enum_constant != NULL && enum_constant->getNameAsString() == EXTERNAL) { |
| 79 | clang::QualType type = enum_constant->getType(); |
| 80 | return (type.getAsString() == STATE_TAG); |
| 81 | } |
| 82 | |
| 83 | return false; |
| 84 | } |
| 85 | |
| 86 | |
Ben Murdoch | 257744e | 2011-11-30 15:57:28 +0000 | [diff] [blame] | 87 | struct Resolver { |
| 88 | explicit Resolver(clang::ASTContext& ctx) |
| 89 | : ctx_(ctx), decl_ctx_(ctx.getTranslationUnitDecl()) { |
| 90 | } |
| 91 | |
| 92 | Resolver(clang::ASTContext& ctx, clang::DeclContext* decl_ctx) |
| 93 | : ctx_(ctx), decl_ctx_(decl_ctx) { |
| 94 | } |
| 95 | |
| 96 | clang::DeclarationName ResolveName(const char* n) { |
| 97 | clang::IdentifierInfo* ident = &ctx_.Idents.get(n); |
| 98 | return ctx_.DeclarationNames.getIdentifier(ident); |
| 99 | } |
| 100 | |
| 101 | Resolver ResolveNamespace(const char* n) { |
| 102 | return Resolver(ctx_, Resolve<clang::NamespaceDecl>(n)); |
| 103 | } |
| 104 | |
| 105 | template<typename T> |
| 106 | T* Resolve(const char* n) { |
| 107 | if (decl_ctx_ == NULL) return NULL; |
| 108 | |
| 109 | clang::DeclContext::lookup_result result = |
| 110 | decl_ctx_->lookup(ResolveName(n)); |
| 111 | |
Ben Murdoch | b8a8cc1 | 2014-11-26 15:28:44 +0000 | [diff] [blame] | 112 | clang::DeclContext::lookup_iterator end = result.end(); |
| 113 | for (clang::DeclContext::lookup_iterator i = result.begin(); i != end; |
Ben Murdoch | 257744e | 2011-11-30 15:57:28 +0000 | [diff] [blame] | 114 | i++) { |
Ben Murdoch | b8a8cc1 | 2014-11-26 15:28:44 +0000 | [diff] [blame] | 115 | if (llvm::isa<T>(*i)) return llvm::cast<T>(*i); |
Ben Murdoch | 257744e | 2011-11-30 15:57:28 +0000 | [diff] [blame] | 116 | } |
| 117 | |
| 118 | return NULL; |
| 119 | } |
| 120 | |
| 121 | private: |
| 122 | clang::ASTContext& ctx_; |
| 123 | clang::DeclContext* decl_ctx_; |
| 124 | }; |
| 125 | |
| 126 | |
Ben Murdoch | 8b112d2 | 2011-06-08 16:22:53 +0100 | [diff] [blame] | 127 | class CalleesPrinter : public clang::RecursiveASTVisitor<CalleesPrinter> { |
| 128 | public: |
| 129 | explicit CalleesPrinter(clang::MangleContext* ctx) : ctx_(ctx) { |
| 130 | } |
| 131 | |
| 132 | virtual bool VisitCallExpr(clang::CallExpr* expr) { |
| 133 | const clang::FunctionDecl* callee = expr->getDirectCallee(); |
| 134 | if (callee != NULL) AnalyzeFunction(callee); |
| 135 | return true; |
| 136 | } |
| 137 | |
Ben Murdoch | 3ef787d | 2012-04-12 10:51:47 +0100 | [diff] [blame] | 138 | virtual bool VisitDeclRefExpr(clang::DeclRefExpr* expr) { |
| 139 | // If function mentions EXTERNAL VMState add artificial garbage collection |
| 140 | // mark. |
| 141 | if (IsExternalVMState(expr->getDecl())) AddCallee("CollectGarbage"); |
| 142 | return true; |
| 143 | } |
| 144 | |
Ben Murdoch | 8b112d2 | 2011-06-08 16:22:53 +0100 | [diff] [blame] | 145 | void AnalyzeFunction(const clang::FunctionDecl* f) { |
| 146 | MangledName name; |
| 147 | if (InV8Namespace(f) && GetMangledName(ctx_, f, &name)) { |
| 148 | AddCallee(name); |
| 149 | |
| 150 | const clang::FunctionDecl* body = NULL; |
| 151 | if (f->hasBody(body) && !Analyzed(name)) { |
| 152 | EnterScope(name); |
| 153 | TraverseStmt(body->getBody()); |
| 154 | LeaveScope(); |
| 155 | } |
| 156 | } |
| 157 | } |
| 158 | |
| 159 | typedef std::map<MangledName, CalleesSet* > Callgraph; |
| 160 | |
| 161 | bool Analyzed(const MangledName& name) { |
| 162 | return callgraph_[name] != NULL; |
| 163 | } |
| 164 | |
| 165 | void EnterScope(const MangledName& name) { |
| 166 | CalleesSet* callees = callgraph_[name]; |
| 167 | |
| 168 | if (callees == NULL) { |
| 169 | callgraph_[name] = callees = new CalleesSet(); |
| 170 | } |
| 171 | |
| 172 | scopes_.push(callees); |
| 173 | } |
| 174 | |
| 175 | void LeaveScope() { |
| 176 | scopes_.pop(); |
| 177 | } |
| 178 | |
| 179 | void AddCallee(const MangledName& name) { |
| 180 | if (!scopes_.empty()) scopes_.top()->insert(name); |
| 181 | } |
| 182 | |
| 183 | void PrintCallGraph() { |
| 184 | for (Callgraph::const_iterator i = callgraph_.begin(), e = callgraph_.end(); |
| 185 | i != e; |
| 186 | ++i) { |
| 187 | std::cout << i->first << "\n"; |
| 188 | |
| 189 | CalleesSet* callees = i->second; |
| 190 | for (CalleesSet::const_iterator j = callees->begin(), e = callees->end(); |
| 191 | j != e; |
| 192 | ++j) { |
| 193 | std::cout << "\t" << *j << "\n"; |
| 194 | } |
| 195 | } |
| 196 | } |
| 197 | |
| 198 | private: |
| 199 | clang::MangleContext* ctx_; |
| 200 | |
| 201 | std::stack<CalleesSet* > scopes_; |
| 202 | Callgraph callgraph_; |
| 203 | }; |
| 204 | |
Ben Murdoch | 257744e | 2011-11-30 15:57:28 +0000 | [diff] [blame] | 205 | |
Ben Murdoch | 8b112d2 | 2011-06-08 16:22:53 +0100 | [diff] [blame] | 206 | class FunctionDeclarationFinder |
| 207 | : public clang::ASTConsumer, |
| 208 | public clang::RecursiveASTVisitor<FunctionDeclarationFinder> { |
| 209 | public: |
Ben Murdoch | b8a8cc1 | 2014-11-26 15:28:44 +0000 | [diff] [blame] | 210 | explicit FunctionDeclarationFinder(clang::DiagnosticsEngine& d, |
Ben Murdoch | 257744e | 2011-11-30 15:57:28 +0000 | [diff] [blame] | 211 | clang::SourceManager& sm, |
| 212 | const std::vector<std::string>& args) |
Ben Murdoch | b8a8cc1 | 2014-11-26 15:28:44 +0000 | [diff] [blame] | 213 | : d_(d), sm_(sm) {} |
Ben Murdoch | 8b112d2 | 2011-06-08 16:22:53 +0100 | [diff] [blame] | 214 | |
| 215 | virtual void HandleTranslationUnit(clang::ASTContext &ctx) { |
Ben Murdoch | b8a8cc1 | 2014-11-26 15:28:44 +0000 | [diff] [blame] | 216 | mangle_context_ = clang::ItaniumMangleContext::create(ctx, d_); |
Ben Murdoch | 8b112d2 | 2011-06-08 16:22:53 +0100 | [diff] [blame] | 217 | callees_printer_ = new CalleesPrinter(mangle_context_); |
| 218 | |
| 219 | TraverseDecl(ctx.getTranslationUnitDecl()); |
| 220 | |
| 221 | callees_printer_->PrintCallGraph(); |
| 222 | } |
| 223 | |
| 224 | virtual bool VisitFunctionDecl(clang::FunctionDecl* decl) { |
| 225 | callees_printer_->AnalyzeFunction(decl); |
| 226 | return true; |
| 227 | } |
| 228 | |
| 229 | private: |
Ben Murdoch | b8a8cc1 | 2014-11-26 15:28:44 +0000 | [diff] [blame] | 230 | clang::DiagnosticsEngine& d_; |
Ben Murdoch | 8b112d2 | 2011-06-08 16:22:53 +0100 | [diff] [blame] | 231 | clang::SourceManager& sm_; |
| 232 | clang::MangleContext* mangle_context_; |
| 233 | |
| 234 | CalleesPrinter* callees_printer_; |
| 235 | }; |
| 236 | |
| 237 | |
| 238 | static bool loaded = false; |
| 239 | static CalleesSet gc_suspects; |
| 240 | |
| 241 | |
| 242 | static void LoadGCSuspects() { |
| 243 | if (loaded) return; |
| 244 | |
| 245 | std::ifstream fin("gcsuspects"); |
| 246 | std::string s; |
| 247 | |
| 248 | while (fin >> s) gc_suspects.insert(s); |
| 249 | |
| 250 | loaded = true; |
| 251 | } |
| 252 | |
| 253 | |
| 254 | static bool KnownToCauseGC(clang::MangleContext* ctx, |
| 255 | const clang::FunctionDecl* decl) { |
| 256 | LoadGCSuspects(); |
| 257 | |
| 258 | if (!InV8Namespace(decl)) return false; |
| 259 | |
| 260 | MangledName name; |
| 261 | if (GetMangledName(ctx, decl, &name)) { |
| 262 | return gc_suspects.find(name) != gc_suspects.end(); |
| 263 | } |
| 264 | |
| 265 | return false; |
| 266 | } |
| 267 | |
| 268 | |
Ben Murdoch | 257744e | 2011-11-30 15:57:28 +0000 | [diff] [blame] | 269 | static const int kNoEffect = 0; |
| 270 | static const int kCausesGC = 1; |
| 271 | static const int kRawDef = 2; |
| 272 | static const int kRawUse = 4; |
| 273 | static const int kAllEffects = kCausesGC | kRawDef | kRawUse; |
Ben Murdoch | 8b112d2 | 2011-06-08 16:22:53 +0100 | [diff] [blame] | 274 | |
Ben Murdoch | 257744e | 2011-11-30 15:57:28 +0000 | [diff] [blame] | 275 | class Environment; |
| 276 | |
| 277 | class ExprEffect { |
| 278 | public: |
| 279 | bool hasGC() { return (effect_ & kCausesGC) != 0; } |
| 280 | void setGC() { effect_ |= kCausesGC; } |
| 281 | |
| 282 | bool hasRawDef() { return (effect_ & kRawDef) != 0; } |
| 283 | void setRawDef() { effect_ |= kRawDef; } |
| 284 | |
| 285 | bool hasRawUse() { return (effect_ & kRawUse) != 0; } |
| 286 | void setRawUse() { effect_ |= kRawUse; } |
| 287 | |
| 288 | static ExprEffect None() { return ExprEffect(kNoEffect, NULL); } |
| 289 | static ExprEffect NoneWithEnv(Environment* env) { |
| 290 | return ExprEffect(kNoEffect, env); |
| 291 | } |
| 292 | static ExprEffect RawUse() { return ExprEffect(kRawUse, NULL); } |
| 293 | |
| 294 | static ExprEffect Merge(ExprEffect a, ExprEffect b); |
| 295 | static ExprEffect MergeSeq(ExprEffect a, ExprEffect b); |
| 296 | ExprEffect Define(const std::string& name); |
| 297 | |
| 298 | Environment* env() { |
| 299 | return reinterpret_cast<Environment*>(effect_ & ~kAllEffects); |
| 300 | } |
| 301 | |
Ben Murdoch | 3ef787d | 2012-04-12 10:51:47 +0100 | [diff] [blame] | 302 | static ExprEffect GC() { |
| 303 | return ExprEffect(kCausesGC, NULL); |
| 304 | } |
| 305 | |
Ben Murdoch | 257744e | 2011-11-30 15:57:28 +0000 | [diff] [blame] | 306 | private: |
| 307 | ExprEffect(int effect, Environment* env) |
| 308 | : effect_((effect & kAllEffects) | |
| 309 | reinterpret_cast<intptr_t>(env)) { } |
| 310 | |
| 311 | intptr_t effect_; |
| 312 | }; |
| 313 | |
| 314 | |
| 315 | const std::string BAD_EXPR_MSG("Possible problem with evaluation order."); |
| 316 | const std::string DEAD_VAR_MSG("Possibly dead variable."); |
| 317 | |
| 318 | |
| 319 | class Environment { |
| 320 | public: |
| 321 | Environment() { } |
| 322 | |
| 323 | static Environment Unreachable() { |
| 324 | Environment env; |
| 325 | env.live_.set(); |
| 326 | return env; |
| 327 | } |
| 328 | |
| 329 | static Environment Merge(const Environment& l, |
| 330 | const Environment& r) { |
| 331 | return Environment(l, r); |
| 332 | } |
| 333 | |
| 334 | Environment ApplyEffect(ExprEffect effect) const { |
| 335 | Environment out = effect.hasGC() ? Environment() : Environment(*this); |
| 336 | if (effect.env() != NULL) out.live_ |= effect.env()->live_; |
| 337 | return out; |
| 338 | } |
| 339 | |
| 340 | typedef std::map<std::string, int> SymbolTable; |
| 341 | |
| 342 | bool IsAlive(const std::string& name) const { |
| 343 | SymbolTable::iterator code = symbol_table_.find(name); |
| 344 | if (code == symbol_table_.end()) return false; |
| 345 | return live_[code->second]; |
| 346 | } |
| 347 | |
| 348 | bool Equal(const Environment& env) { |
| 349 | return live_ == env.live_; |
| 350 | } |
| 351 | |
| 352 | Environment Define(const std::string& name) const { |
| 353 | return Environment(*this, SymbolToCode(name)); |
| 354 | } |
| 355 | |
| 356 | void MDefine(const std::string& name) { |
| 357 | live_.set(SymbolToCode(name)); |
| 358 | } |
| 359 | |
| 360 | static int SymbolToCode(const std::string& name) { |
| 361 | SymbolTable::iterator code = symbol_table_.find(name); |
| 362 | |
| 363 | if (code == symbol_table_.end()) { |
| 364 | int new_code = symbol_table_.size(); |
| 365 | symbol_table_.insert(std::make_pair(name, new_code)); |
| 366 | return new_code; |
| 367 | } |
| 368 | |
| 369 | return code->second; |
| 370 | } |
| 371 | |
| 372 | static void ClearSymbolTable() { |
| 373 | std::vector<Environment*>::iterator end = envs_.end(); |
| 374 | for (std::vector<Environment*>::iterator i = envs_.begin(); |
| 375 | i != end; |
| 376 | ++i) { |
| 377 | delete *i; |
| 378 | } |
| 379 | envs_.clear(); |
| 380 | symbol_table_.clear(); |
| 381 | } |
| 382 | |
| 383 | void Print() const { |
| 384 | bool comma = false; |
| 385 | std::cout << "{"; |
| 386 | SymbolTable::iterator end = symbol_table_.end(); |
| 387 | for (SymbolTable::iterator i = symbol_table_.begin(); |
| 388 | i != end; |
| 389 | ++i) { |
| 390 | if (live_[i->second]) { |
| 391 | if (comma) std::cout << ", "; |
| 392 | std::cout << i->first; |
| 393 | comma = true; |
Ben Murdoch | 8b112d2 | 2011-06-08 16:22:53 +0100 | [diff] [blame] | 394 | } |
| 395 | } |
Ben Murdoch | 257744e | 2011-11-30 15:57:28 +0000 | [diff] [blame] | 396 | std::cout << "}"; |
| 397 | } |
| 398 | |
| 399 | static Environment* Allocate(const Environment& env) { |
| 400 | Environment* allocated_env = new Environment(env); |
| 401 | envs_.push_back(allocated_env); |
| 402 | return allocated_env; |
| 403 | } |
| 404 | |
| 405 | private: |
| 406 | Environment(const Environment& l, const Environment& r) |
| 407 | : live_(l.live_ & r.live_) { |
| 408 | } |
| 409 | |
| 410 | Environment(const Environment& l, int code) |
| 411 | : live_(l.live_) { |
| 412 | live_.set(code); |
| 413 | } |
| 414 | |
| 415 | static SymbolTable symbol_table_; |
| 416 | static std::vector<Environment* > envs_; |
| 417 | |
| 418 | static const int kMaxNumberOfLocals = 256; |
| 419 | std::bitset<kMaxNumberOfLocals> live_; |
| 420 | |
| 421 | friend class ExprEffect; |
| 422 | friend class CallProps; |
| 423 | }; |
| 424 | |
| 425 | |
| 426 | class CallProps { |
| 427 | public: |
| 428 | CallProps() : env_(NULL) { } |
| 429 | |
| 430 | void SetEffect(int arg, ExprEffect in) { |
| 431 | if (in.hasGC()) gc_.set(arg); |
| 432 | if (in.hasRawDef()) raw_def_.set(arg); |
| 433 | if (in.hasRawUse()) raw_use_.set(arg); |
| 434 | if (in.env() != NULL) { |
| 435 | if (env_ == NULL) env_ = in.env(); |
| 436 | env_->live_ |= in.env()->live_; |
Ben Murdoch | 8b112d2 | 2011-06-08 16:22:53 +0100 | [diff] [blame] | 437 | } |
| 438 | } |
| 439 | |
Ben Murdoch | 257744e | 2011-11-30 15:57:28 +0000 | [diff] [blame] | 440 | ExprEffect ComputeCumulativeEffect(bool result_is_raw) { |
| 441 | ExprEffect out = ExprEffect::NoneWithEnv(env_); |
| 442 | if (gc_.any()) out.setGC(); |
| 443 | if (raw_use_.any()) out.setRawUse(); |
| 444 | if (result_is_raw) out.setRawDef(); |
| 445 | return out; |
| 446 | } |
| 447 | |
| 448 | bool IsSafe() { |
| 449 | if (!gc_.any()) return true; |
| 450 | std::bitset<kMaxNumberOfArguments> raw = (raw_def_ | raw_use_); |
| 451 | if (!raw.any()) return true; |
| 452 | return gc_.count() == 1 && !((raw ^ gc_).any()); |
| 453 | } |
| 454 | |
| 455 | private: |
| 456 | static const int kMaxNumberOfArguments = 64; |
| 457 | std::bitset<kMaxNumberOfArguments> raw_def_; |
| 458 | std::bitset<kMaxNumberOfArguments> raw_use_; |
| 459 | std::bitset<kMaxNumberOfArguments> gc_; |
| 460 | Environment* env_; |
| 461 | }; |
| 462 | |
| 463 | |
| 464 | Environment::SymbolTable Environment::symbol_table_; |
| 465 | std::vector<Environment* > Environment::envs_; |
| 466 | |
| 467 | |
| 468 | ExprEffect ExprEffect::Merge(ExprEffect a, ExprEffect b) { |
| 469 | Environment* a_env = a.env(); |
| 470 | Environment* b_env = b.env(); |
| 471 | Environment* out = NULL; |
| 472 | if (a_env != NULL && b_env != NULL) { |
| 473 | out = Environment::Allocate(*a_env); |
| 474 | out->live_ &= b_env->live_; |
| 475 | } |
| 476 | return ExprEffect(a.effect_ | b.effect_, out); |
Ben Murdoch | 8b112d2 | 2011-06-08 16:22:53 +0100 | [diff] [blame] | 477 | } |
| 478 | |
| 479 | |
Ben Murdoch | 257744e | 2011-11-30 15:57:28 +0000 | [diff] [blame] | 480 | ExprEffect ExprEffect::MergeSeq(ExprEffect a, ExprEffect b) { |
| 481 | Environment* a_env = b.hasGC() ? NULL : a.env(); |
| 482 | Environment* b_env = b.env(); |
| 483 | Environment* out = (b_env == NULL) ? a_env : b_env; |
| 484 | if (a_env != NULL && b_env != NULL) { |
| 485 | out = Environment::Allocate(*b_env); |
| 486 | out->live_ |= a_env->live_; |
| 487 | } |
| 488 | return ExprEffect(a.effect_ | b.effect_, out); |
| 489 | } |
| 490 | |
| 491 | |
| 492 | ExprEffect ExprEffect::Define(const std::string& name) { |
| 493 | Environment* e = env(); |
| 494 | if (e == NULL) { |
| 495 | e = Environment::Allocate(Environment()); |
| 496 | } |
| 497 | e->MDefine(name); |
| 498 | return ExprEffect(effect_, e); |
| 499 | } |
| 500 | |
| 501 | |
| 502 | static std::string THIS ("this"); |
| 503 | |
| 504 | |
| 505 | class FunctionAnalyzer { |
Ben Murdoch | 8b112d2 | 2011-06-08 16:22:53 +0100 | [diff] [blame] | 506 | public: |
Ben Murdoch | 257744e | 2011-11-30 15:57:28 +0000 | [diff] [blame] | 507 | FunctionAnalyzer(clang::MangleContext* ctx, |
| 508 | clang::DeclarationName handle_decl_name, |
| 509 | clang::CXXRecordDecl* object_decl, |
Ben Murdoch | b8a8cc1 | 2014-11-26 15:28:44 +0000 | [diff] [blame] | 510 | clang::CXXRecordDecl* smi_decl, clang::DiagnosticsEngine& d, |
| 511 | clang::SourceManager& sm, bool dead_vars_analysis) |
Ben Murdoch | 257744e | 2011-11-30 15:57:28 +0000 | [diff] [blame] | 512 | : ctx_(ctx), |
| 513 | handle_decl_name_(handle_decl_name), |
| 514 | object_decl_(object_decl), |
| 515 | smi_decl_(smi_decl), |
| 516 | d_(d), |
| 517 | sm_(sm), |
| 518 | block_(NULL), |
Ben Murdoch | b8a8cc1 | 2014-11-26 15:28:44 +0000 | [diff] [blame] | 519 | dead_vars_analysis_(dead_vars_analysis) {} |
Ben Murdoch | 8b112d2 | 2011-06-08 16:22:53 +0100 | [diff] [blame] | 520 | |
Ben Murdoch | 257744e | 2011-11-30 15:57:28 +0000 | [diff] [blame] | 521 | |
| 522 | // -------------------------------------------------------------------------- |
| 523 | // Expressions |
| 524 | // -------------------------------------------------------------------------- |
| 525 | |
| 526 | ExprEffect VisitExpr(clang::Expr* expr, const Environment& env) { |
Ben Murdoch | b8a8cc1 | 2014-11-26 15:28:44 +0000 | [diff] [blame] | 527 | #define VISIT(type) \ |
| 528 | do { \ |
| 529 | clang::type* concrete_expr = llvm::dyn_cast_or_null<clang::type>(expr); \ |
| 530 | if (concrete_expr != NULL) { \ |
| 531 | return Visit##type(concrete_expr, env); \ |
| 532 | } \ |
| 533 | } while (0); |
Ben Murdoch | 257744e | 2011-11-30 15:57:28 +0000 | [diff] [blame] | 534 | |
| 535 | VISIT(AbstractConditionalOperator); |
| 536 | VISIT(AddrLabelExpr); |
| 537 | VISIT(ArraySubscriptExpr); |
| 538 | VISIT(BinaryOperator); |
Ben Murdoch | 257744e | 2011-11-30 15:57:28 +0000 | [diff] [blame] | 539 | VISIT(BlockExpr); |
| 540 | VISIT(CallExpr); |
| 541 | VISIT(CastExpr); |
| 542 | VISIT(CharacterLiteral); |
| 543 | VISIT(ChooseExpr); |
| 544 | VISIT(CompoundLiteralExpr); |
| 545 | VISIT(CXXBindTemporaryExpr); |
| 546 | VISIT(CXXBoolLiteralExpr); |
| 547 | VISIT(CXXConstructExpr); |
| 548 | VISIT(CXXDefaultArgExpr); |
| 549 | VISIT(CXXDeleteExpr); |
| 550 | VISIT(CXXDependentScopeMemberExpr); |
| 551 | VISIT(CXXNewExpr); |
| 552 | VISIT(CXXNoexceptExpr); |
| 553 | VISIT(CXXNullPtrLiteralExpr); |
| 554 | VISIT(CXXPseudoDestructorExpr); |
| 555 | VISIT(CXXScalarValueInitExpr); |
| 556 | VISIT(CXXThisExpr); |
| 557 | VISIT(CXXThrowExpr); |
| 558 | VISIT(CXXTypeidExpr); |
| 559 | VISIT(CXXUnresolvedConstructExpr); |
| 560 | VISIT(CXXUuidofExpr); |
| 561 | VISIT(DeclRefExpr); |
| 562 | VISIT(DependentScopeDeclRefExpr); |
| 563 | VISIT(DesignatedInitExpr); |
| 564 | VISIT(ExprWithCleanups); |
| 565 | VISIT(ExtVectorElementExpr); |
| 566 | VISIT(FloatingLiteral); |
| 567 | VISIT(GNUNullExpr); |
| 568 | VISIT(ImaginaryLiteral); |
| 569 | VISIT(ImplicitValueInitExpr); |
| 570 | VISIT(InitListExpr); |
| 571 | VISIT(IntegerLiteral); |
| 572 | VISIT(MemberExpr); |
| 573 | VISIT(OffsetOfExpr); |
| 574 | VISIT(OpaqueValueExpr); |
| 575 | VISIT(OverloadExpr); |
| 576 | VISIT(PackExpansionExpr); |
| 577 | VISIT(ParenExpr); |
| 578 | VISIT(ParenListExpr); |
| 579 | VISIT(PredefinedExpr); |
| 580 | VISIT(ShuffleVectorExpr); |
| 581 | VISIT(SizeOfPackExpr); |
| 582 | VISIT(StmtExpr); |
| 583 | VISIT(StringLiteral); |
| 584 | VISIT(SubstNonTypeTemplateParmPackExpr); |
Ben Murdoch | b8a8cc1 | 2014-11-26 15:28:44 +0000 | [diff] [blame] | 585 | VISIT(TypeTraitExpr); |
Ben Murdoch | 257744e | 2011-11-30 15:57:28 +0000 | [diff] [blame] | 586 | VISIT(UnaryOperator); |
Ben Murdoch | 257744e | 2011-11-30 15:57:28 +0000 | [diff] [blame] | 587 | VISIT(VAArgExpr); |
| 588 | #undef VISIT |
| 589 | |
| 590 | return ExprEffect::None(); |
Ben Murdoch | 8b112d2 | 2011-06-08 16:22:53 +0100 | [diff] [blame] | 591 | } |
| 592 | |
Ben Murdoch | 257744e | 2011-11-30 15:57:28 +0000 | [diff] [blame] | 593 | #define DECL_VISIT_EXPR(type) \ |
| 594 | ExprEffect Visit##type (clang::type* expr, const Environment& env) |
Ben Murdoch | 8b112d2 | 2011-06-08 16:22:53 +0100 | [diff] [blame] | 595 | |
Ben Murdoch | 257744e | 2011-11-30 15:57:28 +0000 | [diff] [blame] | 596 | #define IGNORE_EXPR(type) \ |
| 597 | ExprEffect Visit##type (clang::type* expr, const Environment& env) { \ |
| 598 | return ExprEffect::None(); \ |
| 599 | } |
Ben Murdoch | 8b112d2 | 2011-06-08 16:22:53 +0100 | [diff] [blame] | 600 | |
Ben Murdoch | 257744e | 2011-11-30 15:57:28 +0000 | [diff] [blame] | 601 | IGNORE_EXPR(AddrLabelExpr); |
Ben Murdoch | 257744e | 2011-11-30 15:57:28 +0000 | [diff] [blame] | 602 | IGNORE_EXPR(BlockExpr); |
| 603 | IGNORE_EXPR(CharacterLiteral); |
| 604 | IGNORE_EXPR(ChooseExpr); |
| 605 | IGNORE_EXPR(CompoundLiteralExpr); |
| 606 | IGNORE_EXPR(CXXBoolLiteralExpr); |
| 607 | IGNORE_EXPR(CXXDependentScopeMemberExpr); |
| 608 | IGNORE_EXPR(CXXNullPtrLiteralExpr); |
| 609 | IGNORE_EXPR(CXXPseudoDestructorExpr); |
| 610 | IGNORE_EXPR(CXXScalarValueInitExpr); |
| 611 | IGNORE_EXPR(CXXNoexceptExpr); |
| 612 | IGNORE_EXPR(CXXTypeidExpr); |
| 613 | IGNORE_EXPR(CXXUnresolvedConstructExpr); |
| 614 | IGNORE_EXPR(CXXUuidofExpr); |
| 615 | IGNORE_EXPR(DependentScopeDeclRefExpr); |
| 616 | IGNORE_EXPR(DesignatedInitExpr); |
| 617 | IGNORE_EXPR(ExtVectorElementExpr); |
| 618 | IGNORE_EXPR(FloatingLiteral); |
| 619 | IGNORE_EXPR(ImaginaryLiteral); |
| 620 | IGNORE_EXPR(IntegerLiteral); |
| 621 | IGNORE_EXPR(OffsetOfExpr); |
| 622 | IGNORE_EXPR(ImplicitValueInitExpr); |
| 623 | IGNORE_EXPR(PackExpansionExpr); |
| 624 | IGNORE_EXPR(PredefinedExpr); |
| 625 | IGNORE_EXPR(ShuffleVectorExpr); |
| 626 | IGNORE_EXPR(SizeOfPackExpr); |
| 627 | IGNORE_EXPR(StmtExpr); |
| 628 | IGNORE_EXPR(StringLiteral); |
| 629 | IGNORE_EXPR(SubstNonTypeTemplateParmPackExpr); |
Ben Murdoch | b8a8cc1 | 2014-11-26 15:28:44 +0000 | [diff] [blame] | 630 | IGNORE_EXPR(TypeTraitExpr); |
Ben Murdoch | 257744e | 2011-11-30 15:57:28 +0000 | [diff] [blame] | 631 | IGNORE_EXPR(VAArgExpr); |
| 632 | IGNORE_EXPR(GNUNullExpr); |
| 633 | IGNORE_EXPR(OverloadExpr); |
| 634 | |
| 635 | DECL_VISIT_EXPR(CXXThisExpr) { |
| 636 | return Use(expr, expr->getType(), THIS, env); |
| 637 | } |
| 638 | |
| 639 | DECL_VISIT_EXPR(AbstractConditionalOperator) { |
| 640 | Environment after_cond = env.ApplyEffect(VisitExpr(expr->getCond(), env)); |
| 641 | return ExprEffect::Merge(VisitExpr(expr->getTrueExpr(), after_cond), |
| 642 | VisitExpr(expr->getFalseExpr(), after_cond)); |
| 643 | } |
| 644 | |
| 645 | DECL_VISIT_EXPR(ArraySubscriptExpr) { |
| 646 | clang::Expr* exprs[2] = {expr->getBase(), expr->getIdx()}; |
| 647 | return Par(expr, 2, exprs, env); |
| 648 | } |
| 649 | |
| 650 | bool IsRawPointerVar(clang::Expr* expr, std::string* var_name) { |
Ben Murdoch | b8a8cc1 | 2014-11-26 15:28:44 +0000 | [diff] [blame] | 651 | if (llvm::isa<clang::DeclRefExpr>(expr)) { |
| 652 | *var_name = |
| 653 | llvm::cast<clang::DeclRefExpr>(expr)->getDecl()->getNameAsString(); |
Ben Murdoch | 257744e | 2011-11-30 15:57:28 +0000 | [diff] [blame] | 654 | return true; |
Ben Murdoch | 8b112d2 | 2011-06-08 16:22:53 +0100 | [diff] [blame] | 655 | } |
| 656 | return false; |
| 657 | } |
| 658 | |
Ben Murdoch | 257744e | 2011-11-30 15:57:28 +0000 | [diff] [blame] | 659 | DECL_VISIT_EXPR(BinaryOperator) { |
| 660 | clang::Expr* lhs = expr->getLHS(); |
| 661 | clang::Expr* rhs = expr->getRHS(); |
| 662 | clang::Expr* exprs[2] = {lhs, rhs}; |
| 663 | |
| 664 | switch (expr->getOpcode()) { |
| 665 | case clang::BO_Comma: |
| 666 | return Seq(expr, 2, exprs, env); |
| 667 | |
| 668 | case clang::BO_LAnd: |
| 669 | case clang::BO_LOr: |
| 670 | return ExprEffect::Merge(VisitExpr(lhs, env), VisitExpr(rhs, env)); |
| 671 | |
| 672 | case clang::BO_Assign: { |
| 673 | std::string var_name; |
| 674 | if (IsRawPointerVar(lhs, &var_name)) { |
| 675 | return VisitExpr(rhs, env).Define(var_name); |
| 676 | } |
| 677 | return Par(expr, 2, exprs, env); |
| 678 | } |
| 679 | |
| 680 | default: |
| 681 | return Par(expr, 2, exprs, env); |
| 682 | } |
Ben Murdoch | 8b112d2 | 2011-06-08 16:22:53 +0100 | [diff] [blame] | 683 | } |
| 684 | |
Ben Murdoch | 257744e | 2011-11-30 15:57:28 +0000 | [diff] [blame] | 685 | DECL_VISIT_EXPR(CXXBindTemporaryExpr) { |
| 686 | return VisitExpr(expr->getSubExpr(), env); |
Ben Murdoch | 8b112d2 | 2011-06-08 16:22:53 +0100 | [diff] [blame] | 687 | } |
Ben Murdoch | 8b112d2 | 2011-06-08 16:22:53 +0100 | [diff] [blame] | 688 | |
Ben Murdoch | 257744e | 2011-11-30 15:57:28 +0000 | [diff] [blame] | 689 | DECL_VISIT_EXPR(CXXConstructExpr) { |
| 690 | return VisitArguments<>(expr, env); |
| 691 | } |
| 692 | |
| 693 | DECL_VISIT_EXPR(CXXDefaultArgExpr) { |
| 694 | return VisitExpr(expr->getExpr(), env); |
| 695 | } |
| 696 | |
| 697 | DECL_VISIT_EXPR(CXXDeleteExpr) { |
| 698 | return VisitExpr(expr->getArgument(), env); |
| 699 | } |
| 700 | |
Ben Murdoch | b8a8cc1 | 2014-11-26 15:28:44 +0000 | [diff] [blame] | 701 | DECL_VISIT_EXPR(CXXNewExpr) { return VisitExpr(expr->getInitializer(), env); } |
Ben Murdoch | 257744e | 2011-11-30 15:57:28 +0000 | [diff] [blame] | 702 | |
| 703 | DECL_VISIT_EXPR(ExprWithCleanups) { |
| 704 | return VisitExpr(expr->getSubExpr(), env); |
| 705 | } |
| 706 | |
| 707 | DECL_VISIT_EXPR(CXXThrowExpr) { |
| 708 | return VisitExpr(expr->getSubExpr(), env); |
| 709 | } |
| 710 | |
| 711 | DECL_VISIT_EXPR(InitListExpr) { |
| 712 | return Seq(expr, expr->getNumInits(), expr->getInits(), env); |
| 713 | } |
| 714 | |
| 715 | DECL_VISIT_EXPR(MemberExpr) { |
| 716 | return VisitExpr(expr->getBase(), env); |
| 717 | } |
| 718 | |
| 719 | DECL_VISIT_EXPR(OpaqueValueExpr) { |
| 720 | return VisitExpr(expr->getSourceExpr(), env); |
| 721 | } |
| 722 | |
| 723 | DECL_VISIT_EXPR(ParenExpr) { |
| 724 | return VisitExpr(expr->getSubExpr(), env); |
| 725 | } |
| 726 | |
| 727 | DECL_VISIT_EXPR(ParenListExpr) { |
| 728 | return Par(expr, expr->getNumExprs(), expr->getExprs(), env); |
| 729 | } |
| 730 | |
| 731 | DECL_VISIT_EXPR(UnaryOperator) { |
| 732 | // TODO We are treating all expressions that look like &raw_pointer_var |
| 733 | // as definitions of raw_pointer_var. This should be changed to |
| 734 | // recognize less generic pattern: |
| 735 | // |
| 736 | // if (maybe_object->ToObject(&obj)) return maybe_object; |
| 737 | // |
| 738 | if (expr->getOpcode() == clang::UO_AddrOf) { |
| 739 | std::string var_name; |
| 740 | if (IsRawPointerVar(expr->getSubExpr(), &var_name)) { |
| 741 | return ExprEffect::None().Define(var_name); |
Ben Murdoch | 8b112d2 | 2011-06-08 16:22:53 +0100 | [diff] [blame] | 742 | } |
| 743 | } |
Ben Murdoch | 257744e | 2011-11-30 15:57:28 +0000 | [diff] [blame] | 744 | return VisitExpr(expr->getSubExpr(), env); |
| 745 | } |
Ben Murdoch | 8b112d2 | 2011-06-08 16:22:53 +0100 | [diff] [blame] | 746 | |
Ben Murdoch | 257744e | 2011-11-30 15:57:28 +0000 | [diff] [blame] | 747 | DECL_VISIT_EXPR(CastExpr) { |
| 748 | return VisitExpr(expr->getSubExpr(), env); |
| 749 | } |
| 750 | |
| 751 | DECL_VISIT_EXPR(DeclRefExpr) { |
| 752 | return Use(expr, expr->getDecl(), env); |
| 753 | } |
| 754 | |
Ben Murdoch | 257744e | 2011-11-30 15:57:28 +0000 | [diff] [blame] | 755 | ExprEffect Par(clang::Expr* parent, |
| 756 | int n, |
| 757 | clang::Expr** exprs, |
| 758 | const Environment& env) { |
| 759 | CallProps props; |
| 760 | |
| 761 | for (int i = 0; i < n; ++i) { |
| 762 | props.SetEffect(i, VisitExpr(exprs[i], env)); |
| 763 | } |
| 764 | |
| 765 | if (!props.IsSafe()) ReportUnsafe(parent, BAD_EXPR_MSG); |
| 766 | |
| 767 | return props.ComputeCumulativeEffect(IsRawPointerType(parent->getType())); |
| 768 | } |
| 769 | |
| 770 | ExprEffect Seq(clang::Stmt* parent, |
| 771 | int n, |
| 772 | clang::Expr** exprs, |
| 773 | const Environment& env) { |
| 774 | ExprEffect out = ExprEffect::None(); |
| 775 | Environment out_env = env; |
| 776 | for (int i = 0; i < n; ++i) { |
| 777 | out = ExprEffect::MergeSeq(out, VisitExpr(exprs[i], out_env)); |
| 778 | out_env = out_env.ApplyEffect(out); |
| 779 | } |
| 780 | return out; |
| 781 | } |
| 782 | |
| 783 | ExprEffect Use(const clang::Expr* parent, |
| 784 | const clang::QualType& var_type, |
| 785 | const std::string& var_name, |
| 786 | const Environment& env) { |
| 787 | if (IsRawPointerType(var_type)) { |
| 788 | if (!env.IsAlive(var_name) && dead_vars_analysis_) { |
| 789 | ReportUnsafe(parent, DEAD_VAR_MSG); |
| 790 | } |
| 791 | return ExprEffect::RawUse(); |
| 792 | } |
| 793 | return ExprEffect::None(); |
| 794 | } |
| 795 | |
| 796 | ExprEffect Use(const clang::Expr* parent, |
| 797 | const clang::ValueDecl* var, |
| 798 | const Environment& env) { |
Ben Murdoch | 3ef787d | 2012-04-12 10:51:47 +0100 | [diff] [blame] | 799 | if (IsExternalVMState(var)) { |
| 800 | return ExprEffect::GC(); |
| 801 | } |
Ben Murdoch | 257744e | 2011-11-30 15:57:28 +0000 | [diff] [blame] | 802 | return Use(parent, var->getType(), var->getNameAsString(), env); |
| 803 | } |
| 804 | |
| 805 | |
| 806 | template<typename ExprType> |
| 807 | ExprEffect VisitArguments(ExprType* call, const Environment& env) { |
| 808 | CallProps props; |
| 809 | VisitArguments<>(call, &props, env); |
| 810 | if (!props.IsSafe()) ReportUnsafe(call, BAD_EXPR_MSG); |
| 811 | return props.ComputeCumulativeEffect(IsRawPointerType(call->getType())); |
| 812 | } |
| 813 | |
| 814 | template<typename ExprType> |
| 815 | void VisitArguments(ExprType* call, |
| 816 | CallProps* props, |
| 817 | const Environment& env) { |
Ben Murdoch | 8b112d2 | 2011-06-08 16:22:53 +0100 | [diff] [blame] | 818 | for (unsigned arg = 0; arg < call->getNumArgs(); arg++) { |
Ben Murdoch | 257744e | 2011-11-30 15:57:28 +0000 | [diff] [blame] | 819 | props->SetEffect(arg + 1, VisitExpr(call->getArg(arg), env)); |
Ben Murdoch | 8b112d2 | 2011-06-08 16:22:53 +0100 | [diff] [blame] | 820 | } |
| 821 | } |
| 822 | |
Ben Murdoch | 257744e | 2011-11-30 15:57:28 +0000 | [diff] [blame] | 823 | |
| 824 | ExprEffect VisitCallExpr(clang::CallExpr* call, |
| 825 | const Environment& env) { |
| 826 | CallProps props; |
Ben Murdoch | 8b112d2 | 2011-06-08 16:22:53 +0100 | [diff] [blame] | 827 | |
| 828 | clang::CXXMemberCallExpr* memcall = |
Ben Murdoch | b8a8cc1 | 2014-11-26 15:28:44 +0000 | [diff] [blame] | 829 | llvm::dyn_cast_or_null<clang::CXXMemberCallExpr>(call); |
Ben Murdoch | 257744e | 2011-11-30 15:57:28 +0000 | [diff] [blame] | 830 | if (memcall != NULL) { |
| 831 | clang::Expr* receiver = memcall->getImplicitObjectArgument(); |
| 832 | props.SetEffect(0, VisitExpr(receiver, env)); |
Ben Murdoch | 8b112d2 | 2011-06-08 16:22:53 +0100 | [diff] [blame] | 833 | } |
| 834 | |
Ben Murdoch | 257744e | 2011-11-30 15:57:28 +0000 | [diff] [blame] | 835 | VisitArguments<>(call, &props, env); |
| 836 | |
| 837 | if (!props.IsSafe()) ReportUnsafe(call, BAD_EXPR_MSG); |
| 838 | |
| 839 | ExprEffect out = |
| 840 | props.ComputeCumulativeEffect(IsRawPointerType(call->getType())); |
| 841 | |
| 842 | clang::FunctionDecl* callee = call->getDirectCallee(); |
| 843 | if ((callee != NULL) && KnownToCauseGC(ctx_, callee)) { |
| 844 | out.setGC(); |
Ben Murdoch | 8b112d2 | 2011-06-08 16:22:53 +0100 | [diff] [blame] | 845 | } |
Ben Murdoch | 257744e | 2011-11-30 15:57:28 +0000 | [diff] [blame] | 846 | |
| 847 | return out; |
| 848 | } |
| 849 | |
| 850 | // -------------------------------------------------------------------------- |
| 851 | // Statements |
| 852 | // -------------------------------------------------------------------------- |
| 853 | |
| 854 | Environment VisitStmt(clang::Stmt* stmt, const Environment& env) { |
Ben Murdoch | b8a8cc1 | 2014-11-26 15:28:44 +0000 | [diff] [blame] | 855 | #define VISIT(type) \ |
| 856 | do { \ |
| 857 | clang::type* concrete_stmt = llvm::dyn_cast_or_null<clang::type>(stmt); \ |
| 858 | if (concrete_stmt != NULL) { \ |
| 859 | return Visit##type(concrete_stmt, env); \ |
| 860 | } \ |
| 861 | } while (0); |
Ben Murdoch | 257744e | 2011-11-30 15:57:28 +0000 | [diff] [blame] | 862 | |
Ben Murdoch | b8a8cc1 | 2014-11-26 15:28:44 +0000 | [diff] [blame] | 863 | if (clang::Expr* expr = llvm::dyn_cast_or_null<clang::Expr>(stmt)) { |
Ben Murdoch | 257744e | 2011-11-30 15:57:28 +0000 | [diff] [blame] | 864 | return env.ApplyEffect(VisitExpr(expr, env)); |
| 865 | } |
| 866 | |
| 867 | VISIT(AsmStmt); |
| 868 | VISIT(BreakStmt); |
| 869 | VISIT(CompoundStmt); |
| 870 | VISIT(ContinueStmt); |
| 871 | VISIT(CXXCatchStmt); |
| 872 | VISIT(CXXTryStmt); |
| 873 | VISIT(DeclStmt); |
| 874 | VISIT(DoStmt); |
| 875 | VISIT(ForStmt); |
| 876 | VISIT(GotoStmt); |
| 877 | VISIT(IfStmt); |
| 878 | VISIT(IndirectGotoStmt); |
| 879 | VISIT(LabelStmt); |
| 880 | VISIT(NullStmt); |
| 881 | VISIT(ReturnStmt); |
| 882 | VISIT(CaseStmt); |
| 883 | VISIT(DefaultStmt); |
| 884 | VISIT(SwitchStmt); |
| 885 | VISIT(WhileStmt); |
| 886 | #undef VISIT |
| 887 | |
| 888 | return env; |
| 889 | } |
| 890 | |
| 891 | #define DECL_VISIT_STMT(type) \ |
| 892 | Environment Visit##type (clang::type* stmt, const Environment& env) |
| 893 | |
| 894 | #define IGNORE_STMT(type) \ |
| 895 | Environment Visit##type (clang::type* stmt, const Environment& env) { \ |
| 896 | return env; \ |
| 897 | } |
| 898 | |
| 899 | IGNORE_STMT(IndirectGotoStmt); |
| 900 | IGNORE_STMT(NullStmt); |
| 901 | IGNORE_STMT(AsmStmt); |
| 902 | |
| 903 | // We are ignoring control flow for simplicity. |
| 904 | IGNORE_STMT(GotoStmt); |
| 905 | IGNORE_STMT(LabelStmt); |
| 906 | |
| 907 | // We are ignoring try/catch because V8 does not use them. |
| 908 | IGNORE_STMT(CXXCatchStmt); |
| 909 | IGNORE_STMT(CXXTryStmt); |
| 910 | |
| 911 | class Block { |
| 912 | public: |
| 913 | Block(const Environment& in, |
| 914 | FunctionAnalyzer* owner) |
| 915 | : in_(in), |
| 916 | out_(Environment::Unreachable()), |
| 917 | changed_(false), |
| 918 | owner_(owner) { |
| 919 | parent_ = owner_->EnterBlock(this); |
| 920 | } |
| 921 | |
| 922 | ~Block() { |
| 923 | owner_->LeaveBlock(parent_); |
| 924 | } |
| 925 | |
| 926 | void MergeIn(const Environment& env) { |
| 927 | Environment old_in = in_; |
| 928 | in_ = Environment::Merge(in_, env); |
| 929 | changed_ = !old_in.Equal(in_); |
| 930 | } |
| 931 | |
| 932 | bool changed() { |
| 933 | if (changed_) { |
| 934 | changed_ = false; |
| 935 | return true; |
| 936 | } |
| 937 | return false; |
| 938 | } |
| 939 | |
| 940 | const Environment& in() { |
| 941 | return in_; |
| 942 | } |
| 943 | |
| 944 | const Environment& out() { |
| 945 | return out_; |
| 946 | } |
| 947 | |
| 948 | void MergeOut(const Environment& env) { |
| 949 | out_ = Environment::Merge(out_, env); |
| 950 | } |
| 951 | |
| 952 | void Seq(clang::Stmt* a, clang::Stmt* b, clang::Stmt* c) { |
| 953 | Environment a_out = owner_->VisitStmt(a, in()); |
| 954 | Environment b_out = owner_->VisitStmt(b, a_out); |
| 955 | Environment c_out = owner_->VisitStmt(c, b_out); |
| 956 | MergeOut(c_out); |
| 957 | } |
| 958 | |
| 959 | void Seq(clang::Stmt* a, clang::Stmt* b) { |
| 960 | Environment a_out = owner_->VisitStmt(a, in()); |
| 961 | Environment b_out = owner_->VisitStmt(b, a_out); |
| 962 | MergeOut(b_out); |
| 963 | } |
| 964 | |
| 965 | void Loop(clang::Stmt* a, clang::Stmt* b, clang::Stmt* c) { |
| 966 | Seq(a, b, c); |
| 967 | MergeIn(out()); |
| 968 | } |
| 969 | |
| 970 | void Loop(clang::Stmt* a, clang::Stmt* b) { |
| 971 | Seq(a, b); |
| 972 | MergeIn(out()); |
| 973 | } |
| 974 | |
| 975 | |
| 976 | private: |
| 977 | Environment in_; |
| 978 | Environment out_; |
| 979 | bool changed_; |
| 980 | FunctionAnalyzer* owner_; |
| 981 | Block* parent_; |
| 982 | }; |
| 983 | |
| 984 | |
| 985 | DECL_VISIT_STMT(BreakStmt) { |
| 986 | block_->MergeOut(env); |
| 987 | return Environment::Unreachable(); |
| 988 | } |
| 989 | |
| 990 | DECL_VISIT_STMT(ContinueStmt) { |
| 991 | block_->MergeIn(env); |
| 992 | return Environment::Unreachable(); |
| 993 | } |
| 994 | |
| 995 | DECL_VISIT_STMT(CompoundStmt) { |
| 996 | Environment out = env; |
| 997 | clang::CompoundStmt::body_iterator end = stmt->body_end(); |
| 998 | for (clang::CompoundStmt::body_iterator s = stmt->body_begin(); |
| 999 | s != end; |
| 1000 | ++s) { |
| 1001 | out = VisitStmt(*s, out); |
| 1002 | } |
| 1003 | return out; |
| 1004 | } |
| 1005 | |
| 1006 | DECL_VISIT_STMT(WhileStmt) { |
| 1007 | Block block (env, this); |
| 1008 | do { |
| 1009 | block.Loop(stmt->getCond(), stmt->getBody()); |
| 1010 | } while (block.changed()); |
| 1011 | return block.out(); |
| 1012 | } |
| 1013 | |
| 1014 | DECL_VISIT_STMT(DoStmt) { |
| 1015 | Block block (env, this); |
| 1016 | do { |
| 1017 | block.Loop(stmt->getBody(), stmt->getCond()); |
| 1018 | } while (block.changed()); |
| 1019 | return block.out(); |
| 1020 | } |
| 1021 | |
| 1022 | DECL_VISIT_STMT(ForStmt) { |
| 1023 | Block block (VisitStmt(stmt->getInit(), env), this); |
| 1024 | do { |
| 1025 | block.Loop(stmt->getCond(), |
| 1026 | stmt->getBody(), |
| 1027 | stmt->getInc()); |
| 1028 | } while (block.changed()); |
| 1029 | return block.out(); |
| 1030 | } |
| 1031 | |
| 1032 | DECL_VISIT_STMT(IfStmt) { |
| 1033 | Environment cond_out = VisitStmt(stmt->getCond(), env); |
| 1034 | Environment then_out = VisitStmt(stmt->getThen(), cond_out); |
| 1035 | Environment else_out = VisitStmt(stmt->getElse(), cond_out); |
| 1036 | return Environment::Merge(then_out, else_out); |
| 1037 | } |
| 1038 | |
| 1039 | DECL_VISIT_STMT(SwitchStmt) { |
| 1040 | Block block (env, this); |
| 1041 | block.Seq(stmt->getCond(), stmt->getBody()); |
| 1042 | return block.out(); |
| 1043 | } |
| 1044 | |
| 1045 | DECL_VISIT_STMT(CaseStmt) { |
| 1046 | Environment in = Environment::Merge(env, block_->in()); |
| 1047 | Environment after_lhs = VisitStmt(stmt->getLHS(), in); |
| 1048 | return VisitStmt(stmt->getSubStmt(), after_lhs); |
| 1049 | } |
| 1050 | |
| 1051 | DECL_VISIT_STMT(DefaultStmt) { |
| 1052 | Environment in = Environment::Merge(env, block_->in()); |
| 1053 | return VisitStmt(stmt->getSubStmt(), in); |
| 1054 | } |
| 1055 | |
| 1056 | DECL_VISIT_STMT(ReturnStmt) { |
| 1057 | VisitExpr(stmt->getRetValue(), env); |
| 1058 | return Environment::Unreachable(); |
Ben Murdoch | 8b112d2 | 2011-06-08 16:22:53 +0100 | [diff] [blame] | 1059 | } |
| 1060 | |
| 1061 | const clang::TagType* ToTagType(const clang::Type* t) { |
| 1062 | if (t == NULL) { |
| 1063 | return NULL; |
Ben Murdoch | b8a8cc1 | 2014-11-26 15:28:44 +0000 | [diff] [blame] | 1064 | } else if (llvm::isa<clang::TagType>(t)) { |
| 1065 | return llvm::cast<clang::TagType>(t); |
| 1066 | } else if (llvm::isa<clang::SubstTemplateTypeParmType>(t)) { |
| 1067 | return ToTagType(llvm::cast<clang::SubstTemplateTypeParmType>(t) |
| 1068 | ->getReplacementType() |
| 1069 | .getTypePtr()); |
Ben Murdoch | 8b112d2 | 2011-06-08 16:22:53 +0100 | [diff] [blame] | 1070 | } else { |
| 1071 | return NULL; |
| 1072 | } |
| 1073 | } |
| 1074 | |
Ben Murdoch | 257744e | 2011-11-30 15:57:28 +0000 | [diff] [blame] | 1075 | bool IsDerivedFrom(clang::CXXRecordDecl* record, |
| 1076 | clang::CXXRecordDecl* base) { |
| 1077 | return (record == base) || record->isDerivedFrom(base); |
| 1078 | } |
Ben Murdoch | 8b112d2 | 2011-06-08 16:22:53 +0100 | [diff] [blame] | 1079 | |
Ben Murdoch | 257744e | 2011-11-30 15:57:28 +0000 | [diff] [blame] | 1080 | bool IsRawPointerType(clang::QualType qtype) { |
Ben Murdoch | 8b112d2 | 2011-06-08 16:22:53 +0100 | [diff] [blame] | 1081 | const clang::PointerType* type = |
Ben Murdoch | b8a8cc1 | 2014-11-26 15:28:44 +0000 | [diff] [blame] | 1082 | llvm::dyn_cast_or_null<clang::PointerType>(qtype.getTypePtrOrNull()); |
Ben Murdoch | 8b112d2 | 2011-06-08 16:22:53 +0100 | [diff] [blame] | 1083 | if (type == NULL) return false; |
| 1084 | |
| 1085 | const clang::TagType* pointee = |
| 1086 | ToTagType(type->getPointeeType().getTypePtr()); |
| 1087 | if (pointee == NULL) return false; |
| 1088 | |
| 1089 | clang::CXXRecordDecl* record = |
Ben Murdoch | b8a8cc1 | 2014-11-26 15:28:44 +0000 | [diff] [blame] | 1090 | llvm::dyn_cast_or_null<clang::CXXRecordDecl>(pointee->getDecl()); |
Ben Murdoch | 8b112d2 | 2011-06-08 16:22:53 +0100 | [diff] [blame] | 1091 | if (record == NULL) return false; |
| 1092 | |
Ben Murdoch | 257744e | 2011-11-30 15:57:28 +0000 | [diff] [blame] | 1093 | if (!InV8Namespace(record)) return false; |
| 1094 | |
| 1095 | if (!record->hasDefinition()) return false; |
| 1096 | |
| 1097 | record = record->getDefinition(); |
| 1098 | |
| 1099 | return IsDerivedFrom(record, object_decl_) && |
| 1100 | !IsDerivedFrom(record, smi_decl_); |
Ben Murdoch | 8b112d2 | 2011-06-08 16:22:53 +0100 | [diff] [blame] | 1101 | } |
| 1102 | |
Ben Murdoch | 257744e | 2011-11-30 15:57:28 +0000 | [diff] [blame] | 1103 | Environment VisitDecl(clang::Decl* decl, const Environment& env) { |
Ben Murdoch | b8a8cc1 | 2014-11-26 15:28:44 +0000 | [diff] [blame] | 1104 | if (clang::VarDecl* var = llvm::dyn_cast<clang::VarDecl>(decl)) { |
Ben Murdoch | 257744e | 2011-11-30 15:57:28 +0000 | [diff] [blame] | 1105 | Environment out = var->hasInit() ? VisitStmt(var->getInit(), env) : env; |
Ben Murdoch | 8b112d2 | 2011-06-08 16:22:53 +0100 | [diff] [blame] | 1106 | |
Ben Murdoch | 257744e | 2011-11-30 15:57:28 +0000 | [diff] [blame] | 1107 | if (IsRawPointerType(var->getType())) { |
| 1108 | out = out.Define(var->getNameAsString()); |
Ben Murdoch | 8b112d2 | 2011-06-08 16:22:53 +0100 | [diff] [blame] | 1109 | } |
| 1110 | |
Ben Murdoch | 257744e | 2011-11-30 15:57:28 +0000 | [diff] [blame] | 1111 | return out; |
Ben Murdoch | 8b112d2 | 2011-06-08 16:22:53 +0100 | [diff] [blame] | 1112 | } |
Ben Murdoch | 257744e | 2011-11-30 15:57:28 +0000 | [diff] [blame] | 1113 | // TODO: handle other declarations? |
| 1114 | return env; |
| 1115 | } |
Ben Murdoch | 8b112d2 | 2011-06-08 16:22:53 +0100 | [diff] [blame] | 1116 | |
Ben Murdoch | 257744e | 2011-11-30 15:57:28 +0000 | [diff] [blame] | 1117 | DECL_VISIT_STMT(DeclStmt) { |
| 1118 | Environment out = env; |
| 1119 | clang::DeclStmt::decl_iterator end = stmt->decl_end(); |
| 1120 | for (clang::DeclStmt::decl_iterator decl = stmt->decl_begin(); |
| 1121 | decl != end; |
| 1122 | ++decl) { |
| 1123 | out = VisitDecl(*decl, out); |
| 1124 | } |
| 1125 | return out; |
| 1126 | } |
| 1127 | |
| 1128 | |
| 1129 | void DefineParameters(const clang::FunctionDecl* f, |
| 1130 | Environment* env) { |
| 1131 | env->MDefine(THIS); |
| 1132 | clang::FunctionDecl::param_const_iterator end = f->param_end(); |
| 1133 | for (clang::FunctionDecl::param_const_iterator p = f->param_begin(); |
| 1134 | p != end; |
| 1135 | ++p) { |
| 1136 | env->MDefine((*p)->getNameAsString()); |
| 1137 | } |
| 1138 | } |
| 1139 | |
| 1140 | |
| 1141 | void AnalyzeFunction(const clang::FunctionDecl* f) { |
| 1142 | const clang::FunctionDecl* body = NULL; |
| 1143 | if (f->hasBody(body)) { |
| 1144 | Environment env; |
| 1145 | DefineParameters(body, &env); |
| 1146 | VisitStmt(body->getBody(), env); |
| 1147 | Environment::ClearSymbolTable(); |
| 1148 | } |
| 1149 | } |
| 1150 | |
| 1151 | Block* EnterBlock(Block* block) { |
| 1152 | Block* parent = block_; |
| 1153 | block_ = block; |
| 1154 | return parent; |
| 1155 | } |
| 1156 | |
| 1157 | void LeaveBlock(Block* block) { |
| 1158 | block_ = block; |
| 1159 | } |
| 1160 | |
| 1161 | private: |
| 1162 | void ReportUnsafe(const clang::Expr* expr, const std::string& msg) { |
| 1163 | d_.Report(clang::FullSourceLoc(expr->getExprLoc(), sm_), |
Ben Murdoch | b8a8cc1 | 2014-11-26 15:28:44 +0000 | [diff] [blame] | 1164 | d_.getCustomDiagID(clang::DiagnosticsEngine::Warning, "%0")) |
| 1165 | << msg; |
Ben Murdoch | 257744e | 2011-11-30 15:57:28 +0000 | [diff] [blame] | 1166 | } |
| 1167 | |
| 1168 | |
| 1169 | clang::MangleContext* ctx_; |
| 1170 | clang::DeclarationName handle_decl_name_; |
| 1171 | clang::CXXRecordDecl* object_decl_; |
| 1172 | clang::CXXRecordDecl* smi_decl_; |
| 1173 | |
Ben Murdoch | b8a8cc1 | 2014-11-26 15:28:44 +0000 | [diff] [blame] | 1174 | clang::DiagnosticsEngine& d_; |
Ben Murdoch | 257744e | 2011-11-30 15:57:28 +0000 | [diff] [blame] | 1175 | clang::SourceManager& sm_; |
| 1176 | |
| 1177 | Block* block_; |
| 1178 | bool dead_vars_analysis_; |
| 1179 | }; |
| 1180 | |
| 1181 | |
| 1182 | class ProblemsFinder : public clang::ASTConsumer, |
| 1183 | public clang::RecursiveASTVisitor<ProblemsFinder> { |
| 1184 | public: |
Ben Murdoch | b8a8cc1 | 2014-11-26 15:28:44 +0000 | [diff] [blame] | 1185 | ProblemsFinder(clang::DiagnosticsEngine& d, clang::SourceManager& sm, |
Ben Murdoch | 257744e | 2011-11-30 15:57:28 +0000 | [diff] [blame] | 1186 | const std::vector<std::string>& args) |
| 1187 | : d_(d), sm_(sm), dead_vars_analysis_(false) { |
| 1188 | for (unsigned i = 0; i < args.size(); ++i) { |
| 1189 | if (args[i] == "--dead-vars") { |
| 1190 | dead_vars_analysis_ = true; |
| 1191 | } |
| 1192 | } |
| 1193 | } |
Ben Murdoch | 8b112d2 | 2011-06-08 16:22:53 +0100 | [diff] [blame] | 1194 | |
| 1195 | virtual void HandleTranslationUnit(clang::ASTContext &ctx) { |
| 1196 | Resolver r(ctx); |
| 1197 | |
Ben Murdoch | 257744e | 2011-11-30 15:57:28 +0000 | [diff] [blame] | 1198 | clang::CXXRecordDecl* object_decl = |
Ben Murdoch | 8b112d2 | 2011-06-08 16:22:53 +0100 | [diff] [blame] | 1199 | r.ResolveNamespace("v8").ResolveNamespace("internal"). |
| 1200 | Resolve<clang::CXXRecordDecl>("Object"); |
| 1201 | |
Ben Murdoch | 257744e | 2011-11-30 15:57:28 +0000 | [diff] [blame] | 1202 | clang::CXXRecordDecl* smi_decl = |
| 1203 | r.ResolveNamespace("v8").ResolveNamespace("internal"). |
| 1204 | Resolve<clang::CXXRecordDecl>("Smi"); |
| 1205 | |
| 1206 | if (object_decl != NULL) object_decl = object_decl->getDefinition(); |
| 1207 | |
| 1208 | if (smi_decl != NULL) smi_decl = smi_decl->getDefinition(); |
| 1209 | |
| 1210 | if (object_decl != NULL && smi_decl != NULL) { |
Ben Murdoch | b8a8cc1 | 2014-11-26 15:28:44 +0000 | [diff] [blame] | 1211 | function_analyzer_ = new FunctionAnalyzer( |
| 1212 | clang::ItaniumMangleContext::create(ctx, d_), r.ResolveName("Handle"), |
| 1213 | object_decl, smi_decl, d_, sm_, dead_vars_analysis_); |
Ben Murdoch | 8b112d2 | 2011-06-08 16:22:53 +0100 | [diff] [blame] | 1214 | TraverseDecl(ctx.getTranslationUnitDecl()); |
| 1215 | } else { |
Ben Murdoch | 257744e | 2011-11-30 15:57:28 +0000 | [diff] [blame] | 1216 | if (object_decl == NULL) { |
| 1217 | llvm::errs() << "Failed to resolve v8::internal::Object\n"; |
| 1218 | } |
| 1219 | if (smi_decl == NULL) { |
| 1220 | llvm::errs() << "Failed to resolve v8::internal::Smi\n"; |
| 1221 | } |
Ben Murdoch | 8b112d2 | 2011-06-08 16:22:53 +0100 | [diff] [blame] | 1222 | } |
| 1223 | } |
| 1224 | |
Ben Murdoch | 257744e | 2011-11-30 15:57:28 +0000 | [diff] [blame] | 1225 | virtual bool VisitFunctionDecl(clang::FunctionDecl* decl) { |
| 1226 | function_analyzer_->AnalyzeFunction(decl); |
Ben Murdoch | 8b112d2 | 2011-06-08 16:22:53 +0100 | [diff] [blame] | 1227 | return true; |
| 1228 | } |
| 1229 | |
| 1230 | private: |
Ben Murdoch | b8a8cc1 | 2014-11-26 15:28:44 +0000 | [diff] [blame] | 1231 | clang::DiagnosticsEngine& d_; |
Ben Murdoch | 8b112d2 | 2011-06-08 16:22:53 +0100 | [diff] [blame] | 1232 | clang::SourceManager& sm_; |
Ben Murdoch | 257744e | 2011-11-30 15:57:28 +0000 | [diff] [blame] | 1233 | bool dead_vars_analysis_; |
Ben Murdoch | 8b112d2 | 2011-06-08 16:22:53 +0100 | [diff] [blame] | 1234 | |
Ben Murdoch | 257744e | 2011-11-30 15:57:28 +0000 | [diff] [blame] | 1235 | FunctionAnalyzer* function_analyzer_; |
Ben Murdoch | 8b112d2 | 2011-06-08 16:22:53 +0100 | [diff] [blame] | 1236 | }; |
| 1237 | |
| 1238 | |
| 1239 | template<typename ConsumerType> |
| 1240 | class Action : public clang::PluginASTAction { |
| 1241 | protected: |
| 1242 | clang::ASTConsumer *CreateASTConsumer(clang::CompilerInstance &CI, |
| 1243 | llvm::StringRef InFile) { |
Ben Murdoch | 257744e | 2011-11-30 15:57:28 +0000 | [diff] [blame] | 1244 | return new ConsumerType(CI.getDiagnostics(), CI.getSourceManager(), args_); |
Ben Murdoch | 8b112d2 | 2011-06-08 16:22:53 +0100 | [diff] [blame] | 1245 | } |
| 1246 | |
| 1247 | bool ParseArgs(const clang::CompilerInstance &CI, |
| 1248 | const std::vector<std::string>& args) { |
Ben Murdoch | 257744e | 2011-11-30 15:57:28 +0000 | [diff] [blame] | 1249 | args_ = args; |
Ben Murdoch | 8b112d2 | 2011-06-08 16:22:53 +0100 | [diff] [blame] | 1250 | return true; |
| 1251 | } |
| 1252 | |
Ben Murdoch | 257744e | 2011-11-30 15:57:28 +0000 | [diff] [blame] | 1253 | void PrintHelp(llvm::raw_ostream& ros) { |
| 1254 | } |
| 1255 | private: |
| 1256 | std::vector<std::string> args_; |
Ben Murdoch | 8b112d2 | 2011-06-08 16:22:53 +0100 | [diff] [blame] | 1257 | }; |
| 1258 | |
| 1259 | |
| 1260 | } |
| 1261 | |
Ben Murdoch | 257744e | 2011-11-30 15:57:28 +0000 | [diff] [blame] | 1262 | static clang::FrontendPluginRegistry::Add<Action<ProblemsFinder> > |
| 1263 | FindProblems("find-problems", "Find GC-unsafe places."); |
Ben Murdoch | 8b112d2 | 2011-06-08 16:22:53 +0100 | [diff] [blame] | 1264 | |
Ben Murdoch | 257744e | 2011-11-30 15:57:28 +0000 | [diff] [blame] | 1265 | static clang::FrontendPluginRegistry::Add< |
| 1266 | Action<FunctionDeclarationFinder> > |
Ben Murdoch | 8b112d2 | 2011-06-08 16:22:53 +0100 | [diff] [blame] | 1267 | DumpCallees("dump-callees", "Dump callees for each function."); |