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comparison lib/Transforms/IPO/FunctionAttrs.cpp @ 95:afa8332a0e37 LLVM3.8

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LLVM 3.8
author Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
date Tue, 13 Oct 2015 17:48:58 +0900
parents 60c9769439b8
children 7d135dc70f03
comparison
equal deleted inserted replaced
84:f3e34b893a5f 95:afa8332a0e37
22 #include "llvm/ADT/SCCIterator.h" 22 #include "llvm/ADT/SCCIterator.h"
23 #include "llvm/ADT/SetVector.h" 23 #include "llvm/ADT/SetVector.h"
24 #include "llvm/ADT/SmallSet.h" 24 #include "llvm/ADT/SmallSet.h"
25 #include "llvm/ADT/Statistic.h" 25 #include "llvm/ADT/Statistic.h"
26 #include "llvm/Analysis/AliasAnalysis.h" 26 #include "llvm/Analysis/AliasAnalysis.h"
27 #include "llvm/Analysis/AssumptionCache.h"
28 #include "llvm/Analysis/BasicAliasAnalysis.h"
27 #include "llvm/Analysis/CallGraph.h" 29 #include "llvm/Analysis/CallGraph.h"
28 #include "llvm/Analysis/CallGraphSCCPass.h" 30 #include "llvm/Analysis/CallGraphSCCPass.h"
29 #include "llvm/Analysis/CaptureTracking.h" 31 #include "llvm/Analysis/CaptureTracking.h"
32 #include "llvm/Analysis/TargetLibraryInfo.h"
33 #include "llvm/Analysis/ValueTracking.h"
30 #include "llvm/IR/GlobalVariable.h" 34 #include "llvm/IR/GlobalVariable.h"
31 #include "llvm/IR/InstIterator.h" 35 #include "llvm/IR/InstIterator.h"
32 #include "llvm/IR/IntrinsicInst.h" 36 #include "llvm/IR/IntrinsicInst.h"
33 #include "llvm/IR/LLVMContext.h" 37 #include "llvm/IR/LLVMContext.h"
38 #include "llvm/Support/Debug.h"
39 #include "llvm/Support/raw_ostream.h"
34 #include "llvm/Analysis/TargetLibraryInfo.h" 40 #include "llvm/Analysis/TargetLibraryInfo.h"
35 using namespace llvm; 41 using namespace llvm;
36 42
37 #define DEBUG_TYPE "functionattrs" 43 #define DEBUG_TYPE "functionattrs"
38 44
40 STATISTIC(NumReadOnly, "Number of functions marked readonly"); 46 STATISTIC(NumReadOnly, "Number of functions marked readonly");
41 STATISTIC(NumNoCapture, "Number of arguments marked nocapture"); 47 STATISTIC(NumNoCapture, "Number of arguments marked nocapture");
42 STATISTIC(NumReadNoneArg, "Number of arguments marked readnone"); 48 STATISTIC(NumReadNoneArg, "Number of arguments marked readnone");
43 STATISTIC(NumReadOnlyArg, "Number of arguments marked readonly"); 49 STATISTIC(NumReadOnlyArg, "Number of arguments marked readonly");
44 STATISTIC(NumNoAlias, "Number of function returns marked noalias"); 50 STATISTIC(NumNoAlias, "Number of function returns marked noalias");
51 STATISTIC(NumNonNullReturn, "Number of function returns marked nonnull");
45 STATISTIC(NumAnnotated, "Number of attributes added to library functions"); 52 STATISTIC(NumAnnotated, "Number of attributes added to library functions");
46 53
47 namespace { 54 namespace {
48 struct FunctionAttrs : public CallGraphSCCPass { 55 struct FunctionAttrs : public CallGraphSCCPass {
49 static char ID; // Pass identification, replacement for typeid 56 static char ID; // Pass identification, replacement for typeid
50 FunctionAttrs() : CallGraphSCCPass(ID), AA(nullptr) { 57 FunctionAttrs() : CallGraphSCCPass(ID) {
51 initializeFunctionAttrsPass(*PassRegistry::getPassRegistry()); 58 initializeFunctionAttrsPass(*PassRegistry::getPassRegistry());
52 } 59 }
53 60
54 // runOnSCC - Analyze the SCC, performing the transformation if possible. 61 bool runOnSCC(CallGraphSCC &SCC) override;
55 bool runOnSCC(CallGraphSCC &SCC) override; 62
56 63 void getAnalysisUsage(AnalysisUsage &AU) const override {
57 // AddReadAttrs - Deduce readonly/readnone attributes for the SCC. 64 AU.setPreservesCFG();
58 bool AddReadAttrs(const CallGraphSCC &SCC); 65 AU.addRequired<AssumptionCacheTracker>();
59 66 AU.addRequired<TargetLibraryInfoWrapperPass>();
60 // AddArgumentAttrs - Deduce nocapture attributes for the SCC. 67 CallGraphSCCPass::getAnalysisUsage(AU);
61 bool AddArgumentAttrs(const CallGraphSCC &SCC); 68 }
62 69
63 // IsFunctionMallocLike - Does this function allocate new memory? 70 private:
64 bool IsFunctionMallocLike(Function *F, 71 TargetLibraryInfo *TLI;
65 SmallPtrSet<Function*, 8> &) const; 72
66 73 bool AddReadAttrs(const CallGraphSCC &SCC);
67 // AddNoAliasAttrs - Deduce noalias attributes for the SCC. 74 bool AddArgumentAttrs(const CallGraphSCC &SCC);
68 bool AddNoAliasAttrs(const CallGraphSCC &SCC); 75 bool AddNoAliasAttrs(const CallGraphSCC &SCC);
69 76 bool AddNonNullAttrs(const CallGraphSCC &SCC);
70 // Utility methods used by inferPrototypeAttributes to add attributes 77 bool annotateLibraryCalls(const CallGraphSCC &SCC);
71 // and maintain annotation statistics. 78 };
72
73 void setDoesNotAccessMemory(Function &F) {
74 if (!F.doesNotAccessMemory()) {
75 F.setDoesNotAccessMemory();
76 ++NumAnnotated;
77 }
78 }
79
80 void setOnlyReadsMemory(Function &F) {
81 if (!F.onlyReadsMemory()) {
82 F.setOnlyReadsMemory();
83 ++NumAnnotated;
84 }
85 }
86
87 void setDoesNotThrow(Function &F) {
88 if (!F.doesNotThrow()) {
89 F.setDoesNotThrow();
90 ++NumAnnotated;
91 }
92 }
93
94 void setDoesNotCapture(Function &F, unsigned n) {
95 if (!F.doesNotCapture(n)) {
96 F.setDoesNotCapture(n);
97 ++NumAnnotated;
98 }
99 }
100
101 void setOnlyReadsMemory(Function &F, unsigned n) {
102 if (!F.onlyReadsMemory(n)) {
103 F.setOnlyReadsMemory(n);
104 ++NumAnnotated;
105 }
106 }
107
108 void setDoesNotAlias(Function &F, unsigned n) {
109 if (!F.doesNotAlias(n)) {
110 F.setDoesNotAlias(n);
111 ++NumAnnotated;
112 }
113 }
114
115 // inferPrototypeAttributes - Analyze the name and prototype of the
116 // given function and set any applicable attributes. Returns true
117 // if any attributes were set and false otherwise.
118 bool inferPrototypeAttributes(Function &F);
119
120 // annotateLibraryCalls - Adds attributes to well-known standard library
121 // call declarations.
122 bool annotateLibraryCalls(const CallGraphSCC &SCC);
123
124 void getAnalysisUsage(AnalysisUsage &AU) const override {
125 AU.setPreservesCFG();
126 AU.addRequired<AliasAnalysis>();
127 AU.addRequired<TargetLibraryInfoWrapperPass>();
128 CallGraphSCCPass::getAnalysisUsage(AU);
129 }
130
131 private:
132 AliasAnalysis *AA;
133 TargetLibraryInfo *TLI;
134 };
135 } 79 }
136 80
137 char FunctionAttrs::ID = 0; 81 char FunctionAttrs::ID = 0;
138 INITIALIZE_PASS_BEGIN(FunctionAttrs, "functionattrs", 82 INITIALIZE_PASS_BEGIN(FunctionAttrs, "functionattrs",
139 "Deduce function attributes", false, false) 83 "Deduce function attributes", false, false)
140 INITIALIZE_AG_DEPENDENCY(AliasAnalysis) 84 INITIALIZE_PASS_DEPENDENCY(AssumptionCacheTracker)
141 INITIALIZE_PASS_DEPENDENCY(CallGraphWrapperPass) 85 INITIALIZE_PASS_DEPENDENCY(CallGraphWrapperPass)
142 INITIALIZE_PASS_DEPENDENCY(TargetLibraryInfoWrapperPass) 86 INITIALIZE_PASS_DEPENDENCY(TargetLibraryInfoWrapperPass)
143 INITIALIZE_PASS_END(FunctionAttrs, "functionattrs", 87 INITIALIZE_PASS_END(FunctionAttrs, "functionattrs",
144 "Deduce function attributes", false, false) 88 "Deduce function attributes", false, false)
145 89
146 Pass *llvm::createFunctionAttrsPass() { return new FunctionAttrs(); } 90 Pass *llvm::createFunctionAttrsPass() { return new FunctionAttrs(); }
147 91
148 92 namespace {
149 /// AddReadAttrs - Deduce readonly/readnone attributes for the SCC. 93 /// The three kinds of memory access relevant to 'readonly' and
94 /// 'readnone' attributes.
95 enum MemoryAccessKind {
96 MAK_ReadNone = 0,
97 MAK_ReadOnly = 1,
98 MAK_MayWrite = 2
99 };
100 }
101
102 static MemoryAccessKind
103 checkFunctionMemoryAccess(Function &F, AAResults &AAR,
104 const SmallPtrSetImpl<Function *> &SCCNodes) {
105 FunctionModRefBehavior MRB = AAR.getModRefBehavior(&F);
106 if (MRB == FMRB_DoesNotAccessMemory)
107 // Already perfect!
108 return MAK_ReadNone;
109
110 // Definitions with weak linkage may be overridden at linktime with
111 // something that writes memory, so treat them like declarations.
112 if (F.isDeclaration() || F.mayBeOverridden()) {
113 if (AliasAnalysis::onlyReadsMemory(MRB))
114 return MAK_ReadOnly;
115
116 // Conservatively assume it writes to memory.
117 return MAK_MayWrite;
118 }
119
120 // Scan the function body for instructions that may read or write memory.
121 bool ReadsMemory = false;
122 for (inst_iterator II = inst_begin(F), E = inst_end(F); II != E; ++II) {
123 Instruction *I = &*II;
124
125 // Some instructions can be ignored even if they read or write memory.
126 // Detect these now, skipping to the next instruction if one is found.
127 CallSite CS(cast<Value>(I));
128 if (CS) {
129 // Ignore calls to functions in the same SCC.
130 if (CS.getCalledFunction() && SCCNodes.count(CS.getCalledFunction()))
131 continue;
132 FunctionModRefBehavior MRB = AAR.getModRefBehavior(CS);
133 // If the call doesn't access arbitrary memory, we may be able to
134 // figure out something.
135 if (AliasAnalysis::onlyAccessesArgPointees(MRB)) {
136 // If the call does access argument pointees, check each argument.
137 if (AliasAnalysis::doesAccessArgPointees(MRB))
138 // Check whether all pointer arguments point to local memory, and
139 // ignore calls that only access local memory.
140 for (CallSite::arg_iterator CI = CS.arg_begin(), CE = CS.arg_end();
141 CI != CE; ++CI) {
142 Value *Arg = *CI;
143 if (Arg->getType()->isPointerTy()) {
144 AAMDNodes AAInfo;
145 I->getAAMetadata(AAInfo);
146
147 MemoryLocation Loc(Arg, MemoryLocation::UnknownSize, AAInfo);
148 if (!AAR.pointsToConstantMemory(Loc, /*OrLocal=*/true)) {
149 if (MRB & MRI_Mod)
150 // Writes non-local memory. Give up.
151 return MAK_MayWrite;
152 if (MRB & MRI_Ref)
153 // Ok, it reads non-local memory.
154 ReadsMemory = true;
155 }
156 }
157 }
158 continue;
159 }
160 // The call could access any memory. If that includes writes, give up.
161 if (MRB & MRI_Mod)
162 return MAK_MayWrite;
163 // If it reads, note it.
164 if (MRB & MRI_Ref)
165 ReadsMemory = true;
166 continue;
167 } else if (LoadInst *LI = dyn_cast<LoadInst>(I)) {
168 // Ignore non-volatile loads from local memory. (Atomic is okay here.)
169 if (!LI->isVolatile()) {
170 MemoryLocation Loc = MemoryLocation::get(LI);
171 if (AAR.pointsToConstantMemory(Loc, /*OrLocal=*/true))
172 continue;
173 }
174 } else if (StoreInst *SI = dyn_cast<StoreInst>(I)) {
175 // Ignore non-volatile stores to local memory. (Atomic is okay here.)
176 if (!SI->isVolatile()) {
177 MemoryLocation Loc = MemoryLocation::get(SI);
178 if (AAR.pointsToConstantMemory(Loc, /*OrLocal=*/true))
179 continue;
180 }
181 } else if (VAArgInst *VI = dyn_cast<VAArgInst>(I)) {
182 // Ignore vaargs on local memory.
183 MemoryLocation Loc = MemoryLocation::get(VI);
184 if (AAR.pointsToConstantMemory(Loc, /*OrLocal=*/true))
185 continue;
186 }
187
188 // Any remaining instructions need to be taken seriously! Check if they
189 // read or write memory.
190 if (I->mayWriteToMemory())
191 // Writes memory. Just give up.
192 return MAK_MayWrite;
193
194 // If this instruction may read memory, remember that.
195 ReadsMemory |= I->mayReadFromMemory();
196 }
197
198 return ReadsMemory ? MAK_ReadOnly : MAK_ReadNone;
199 }
200
201 /// Deduce readonly/readnone attributes for the SCC.
150 bool FunctionAttrs::AddReadAttrs(const CallGraphSCC &SCC) { 202 bool FunctionAttrs::AddReadAttrs(const CallGraphSCC &SCC) {
151 SmallPtrSet<Function*, 8> SCCNodes; 203 SmallPtrSet<Function *, 8> SCCNodes;
152 204
153 // Fill SCCNodes with the elements of the SCC. Used for quickly 205 // Fill SCCNodes with the elements of the SCC. Used for quickly
154 // looking up whether a given CallGraphNode is in this SCC. 206 // looking up whether a given CallGraphNode is in this SCC.
155 for (CallGraphSCC::iterator I = SCC.begin(), E = SCC.end(); I != E; ++I) 207 for (CallGraphSCC::iterator I = SCC.begin(), E = SCC.end(); I != E; ++I)
156 SCCNodes.insert((*I)->getFunction()); 208 SCCNodes.insert((*I)->getFunction());
164 if (!F || F->hasFnAttribute(Attribute::OptimizeNone)) 216 if (!F || F->hasFnAttribute(Attribute::OptimizeNone))
165 // External node or node we don't want to optimize - assume it may write 217 // External node or node we don't want to optimize - assume it may write
166 // memory and give up. 218 // memory and give up.
167 return false; 219 return false;
168 220
169 AliasAnalysis::ModRefBehavior MRB = AA->getModRefBehavior(F); 221 // We need to manually construct BasicAA directly in order to disable its
170 if (MRB == AliasAnalysis::DoesNotAccessMemory) 222 // use of other function analyses.
171 // Already perfect! 223 BasicAAResult BAR(createLegacyPMBasicAAResult(*this, *F));
172 continue; 224
173 225 // Construct our own AA results for this function. We do this manually to
174 // Definitions with weak linkage may be overridden at linktime with 226 // work around the limitations of the legacy pass manager.
175 // something that writes memory, so treat them like declarations. 227 AAResults AAR(createLegacyPMAAResults(*this, *F, BAR));
176 if (F->isDeclaration() || F->mayBeOverridden()) { 228
177 if (!AliasAnalysis::onlyReadsMemory(MRB)) 229 switch (checkFunctionMemoryAccess(*F, AAR, SCCNodes)) {
178 // May write memory. Just give up. 230 case MAK_MayWrite:
179 return false; 231 return false;
180 232 case MAK_ReadOnly:
181 ReadsMemory = true; 233 ReadsMemory = true;
182 continue; 234 break;
183 } 235 case MAK_ReadNone:
184 236 // Nothing to do!
185 // Scan the function body for instructions that may read or write memory. 237 break;
186 for (inst_iterator II = inst_begin(F), E = inst_end(F); II != E; ++II) {
187 Instruction *I = &*II;
188
189 // Some instructions can be ignored even if they read or write memory.
190 // Detect these now, skipping to the next instruction if one is found.
191 CallSite CS(cast<Value>(I));
192 if (CS) {
193 // Ignore calls to functions in the same SCC.
194 if (CS.getCalledFunction() && SCCNodes.count(CS.getCalledFunction()))
195 continue;
196 AliasAnalysis::ModRefBehavior MRB = AA->getModRefBehavior(CS);
197 // If the call doesn't access arbitrary memory, we may be able to
198 // figure out something.
199 if (AliasAnalysis::onlyAccessesArgPointees(MRB)) {
200 // If the call does access argument pointees, check each argument.
201 if (AliasAnalysis::doesAccessArgPointees(MRB))
202 // Check whether all pointer arguments point to local memory, and
203 // ignore calls that only access local memory.
204 for (CallSite::arg_iterator CI = CS.arg_begin(), CE = CS.arg_end();
205 CI != CE; ++CI) {
206 Value *Arg = *CI;
207 if (Arg->getType()->isPointerTy()) {
208 AAMDNodes AAInfo;
209 I->getAAMetadata(AAInfo);
210
211 AliasAnalysis::Location Loc(Arg,
212 AliasAnalysis::UnknownSize, AAInfo);
213 if (!AA->pointsToConstantMemory(Loc, /*OrLocal=*/true)) {
214 if (MRB & AliasAnalysis::Mod)
215 // Writes non-local memory. Give up.
216 return false;
217 if (MRB & AliasAnalysis::Ref)
218 // Ok, it reads non-local memory.
219 ReadsMemory = true;
220 }
221 }
222 }
223 continue;
224 }
225 // The call could access any memory. If that includes writes, give up.
226 if (MRB & AliasAnalysis::Mod)
227 return false;
228 // If it reads, note it.
229 if (MRB & AliasAnalysis::Ref)
230 ReadsMemory = true;
231 continue;
232 } else if (LoadInst *LI = dyn_cast<LoadInst>(I)) {
233 // Ignore non-volatile loads from local memory. (Atomic is okay here.)
234 if (!LI->isVolatile()) {
235 AliasAnalysis::Location Loc = AA->getLocation(LI);
236 if (AA->pointsToConstantMemory(Loc, /*OrLocal=*/true))
237 continue;
238 }
239 } else if (StoreInst *SI = dyn_cast<StoreInst>(I)) {
240 // Ignore non-volatile stores to local memory. (Atomic is okay here.)
241 if (!SI->isVolatile()) {
242 AliasAnalysis::Location Loc = AA->getLocation(SI);
243 if (AA->pointsToConstantMemory(Loc, /*OrLocal=*/true))
244 continue;
245 }
246 } else if (VAArgInst *VI = dyn_cast<VAArgInst>(I)) {
247 // Ignore vaargs on local memory.
248 AliasAnalysis::Location Loc = AA->getLocation(VI);
249 if (AA->pointsToConstantMemory(Loc, /*OrLocal=*/true))
250 continue;
251 }
252
253 // Any remaining instructions need to be taken seriously! Check if they
254 // read or write memory.
255 if (I->mayWriteToMemory())
256 // Writes memory. Just give up.
257 return false;
258
259 // If this instruction may read memory, remember that.
260 ReadsMemory |= I->mayReadFromMemory();
261 } 238 }
262 } 239 }
263 240
264 // Success! Functions in this SCC do not access memory, or only read memory. 241 // Success! Functions in this SCC do not access memory, or only read memory.
265 // Give them the appropriate attribute. 242 // Give them the appropriate attribute.
277 254
278 MadeChange = true; 255 MadeChange = true;
279 256
280 // Clear out any existing attributes. 257 // Clear out any existing attributes.
281 AttrBuilder B; 258 AttrBuilder B;
282 B.addAttribute(Attribute::ReadOnly) 259 B.addAttribute(Attribute::ReadOnly).addAttribute(Attribute::ReadNone);
283 .addAttribute(Attribute::ReadNone); 260 F->removeAttributes(
284 F->removeAttributes(AttributeSet::FunctionIndex, 261 AttributeSet::FunctionIndex,
285 AttributeSet::get(F->getContext(), 262 AttributeSet::get(F->getContext(), AttributeSet::FunctionIndex, B));
286 AttributeSet::FunctionIndex, B));
287 263
288 // Add in the new attribute. 264 // Add in the new attribute.
289 F->addAttribute(AttributeSet::FunctionIndex, 265 F->addAttribute(AttributeSet::FunctionIndex,
290 ReadsMemory ? Attribute::ReadOnly : Attribute::ReadNone); 266 ReadsMemory ? Attribute::ReadOnly : Attribute::ReadNone);
291 267
297 273
298 return MadeChange; 274 return MadeChange;
299 } 275 }
300 276
301 namespace { 277 namespace {
302 // For a given pointer Argument, this retains a list of Arguments of functions 278 /// For a given pointer Argument, this retains a list of Arguments of functions
303 // in the same SCC that the pointer data flows into. We use this to build an 279 /// in the same SCC that the pointer data flows into. We use this to build an
304 // SCC of the arguments. 280 /// SCC of the arguments.
305 struct ArgumentGraphNode { 281 struct ArgumentGraphNode {
306 Argument *Definition; 282 Argument *Definition;
307 SmallVector<ArgumentGraphNode*, 4> Uses; 283 SmallVector<ArgumentGraphNode *, 4> Uses;
308 }; 284 };
309 285
310 class ArgumentGraph { 286 class ArgumentGraph {
311 // We store pointers to ArgumentGraphNode objects, so it's important that 287 // We store pointers to ArgumentGraphNode objects, so it's important that
312 // that they not move around upon insert. 288 // that they not move around upon insert.
313 typedef std::map<Argument*, ArgumentGraphNode> ArgumentMapTy; 289 typedef std::map<Argument *, ArgumentGraphNode> ArgumentMapTy;
314 290
315 ArgumentMapTy ArgumentMap; 291 ArgumentMapTy ArgumentMap;
316 292
317 // There is no root node for the argument graph, in fact: 293 // There is no root node for the argument graph, in fact:
318 // void f(int *x, int *y) { if (...) f(x, y); } 294 // void f(int *x, int *y) { if (...) f(x, y); }
319 // is an example where the graph is disconnected. The SCCIterator requires a 295 // is an example where the graph is disconnected. The SCCIterator requires a
320 // single entry point, so we maintain a fake ("synthetic") root node that 296 // single entry point, so we maintain a fake ("synthetic") root node that
321 // uses every node. Because the graph is directed and nothing points into 297 // uses every node. Because the graph is directed and nothing points into
322 // the root, it will not participate in any SCCs (except for its own). 298 // the root, it will not participate in any SCCs (except for its own).
323 ArgumentGraphNode SyntheticRoot; 299 ArgumentGraphNode SyntheticRoot;
324 300
325 public: 301 public:
326 ArgumentGraph() { SyntheticRoot.Definition = nullptr; } 302 ArgumentGraph() { SyntheticRoot.Definition = nullptr; }
327 303
328 typedef SmallVectorImpl<ArgumentGraphNode*>::iterator iterator; 304 typedef SmallVectorImpl<ArgumentGraphNode *>::iterator iterator;
329 305
330 iterator begin() { return SyntheticRoot.Uses.begin(); } 306 iterator begin() { return SyntheticRoot.Uses.begin(); }
331 iterator end() { return SyntheticRoot.Uses.end(); } 307 iterator end() { return SyntheticRoot.Uses.end(); }
332 ArgumentGraphNode *getEntryNode() { return &SyntheticRoot; } 308 ArgumentGraphNode *getEntryNode() { return &SyntheticRoot; }
333 309
334 ArgumentGraphNode *operator[](Argument *A) { 310 ArgumentGraphNode *operator[](Argument *A) {
335 ArgumentGraphNode &Node = ArgumentMap[A]; 311 ArgumentGraphNode &Node = ArgumentMap[A];
336 Node.Definition = A; 312 Node.Definition = A;
337 SyntheticRoot.Uses.push_back(&Node); 313 SyntheticRoot.Uses.push_back(&Node);
338 return &Node; 314 return &Node;
339 } 315 }
340 }; 316 };
341 317
342 // This tracker checks whether callees are in the SCC, and if so it does not 318 /// This tracker checks whether callees are in the SCC, and if so it does not
343 // consider that a capture, instead adding it to the "Uses" list and 319 /// consider that a capture, instead adding it to the "Uses" list and
344 // continuing with the analysis. 320 /// continuing with the analysis.
345 struct ArgumentUsesTracker : public CaptureTracker { 321 struct ArgumentUsesTracker : public CaptureTracker {
346 ArgumentUsesTracker(const SmallPtrSet<Function*, 8> &SCCNodes) 322 ArgumentUsesTracker(const SmallPtrSet<Function *, 8> &SCCNodes)
347 : Captured(false), SCCNodes(SCCNodes) {} 323 : Captured(false), SCCNodes(SCCNodes) {}
348 324
349 void tooManyUses() override { Captured = true; } 325 void tooManyUses() override { Captured = true; }
350 326
351 bool captured(const Use *U) override { 327 bool captured(const Use *U) override {
352 CallSite CS(U->getUser()); 328 CallSite CS(U->getUser());
353 if (!CS.getInstruction()) { Captured = true; return true; } 329 if (!CS.getInstruction()) {
354 330 Captured = true;
355 Function *F = CS.getCalledFunction(); 331 return true;
356 if (!F || !SCCNodes.count(F)) { Captured = true; return true; } 332 }
357 333
358 bool Found = false; 334 Function *F = CS.getCalledFunction();
359 Function::arg_iterator AI = F->arg_begin(), AE = F->arg_end(); 335 if (!F || !SCCNodes.count(F)) {
360 for (CallSite::arg_iterator PI = CS.arg_begin(), PE = CS.arg_end(); 336 Captured = true;
361 PI != PE; ++PI, ++AI) { 337 return true;
362 if (AI == AE) { 338 }
363 assert(F->isVarArg() && "More params than args in non-varargs call"); 339
364 Captured = true; 340 bool Found = false;
365 return true; 341 Function::arg_iterator AI = F->arg_begin(), AE = F->arg_end();
366 } 342 for (CallSite::arg_iterator PI = CS.arg_begin(), PE = CS.arg_end();
367 if (PI == U) { 343 PI != PE; ++PI, ++AI) {
368 Uses.push_back(AI); 344 if (AI == AE) {
369 Found = true; 345 assert(F->isVarArg() && "More params than args in non-varargs call");
370 break; 346 Captured = true;
371 } 347 return true;
372 } 348 }
373 assert(Found && "Capturing call-site captured nothing?"); 349 if (PI == U) {
374 (void)Found; 350 Uses.push_back(AI);
375 return false; 351 Found = true;
376 } 352 break;
377 353 }
378 bool Captured; // True only if certainly captured (used outside our SCC). 354 }
379 SmallVector<Argument*, 4> Uses; // Uses within our SCC. 355 assert(Found && "Capturing call-site captured nothing?");
380 356 (void)Found;
381 const SmallPtrSet<Function*, 8> &SCCNodes; 357 return false;
382 }; 358 }
359
360 bool Captured; // True only if certainly captured (used outside our SCC).
361 SmallVector<Argument *, 4> Uses; // Uses within our SCC.
362
363 const SmallPtrSet<Function *, 8> &SCCNodes;
364 };
383 } 365 }
384 366
385 namespace llvm { 367 namespace llvm {
386 template<> struct GraphTraits<ArgumentGraphNode*> { 368 template <> struct GraphTraits<ArgumentGraphNode *> {
387 typedef ArgumentGraphNode NodeType; 369 typedef ArgumentGraphNode NodeType;
388 typedef SmallVectorImpl<ArgumentGraphNode*>::iterator ChildIteratorType; 370 typedef SmallVectorImpl<ArgumentGraphNode *>::iterator ChildIteratorType;
389 371
390 static inline NodeType *getEntryNode(NodeType *A) { return A; } 372 static inline NodeType *getEntryNode(NodeType *A) { return A; }
391 static inline ChildIteratorType child_begin(NodeType *N) { 373 static inline ChildIteratorType child_begin(NodeType *N) {
392 return N->Uses.begin(); 374 return N->Uses.begin();
393 } 375 }
394 static inline ChildIteratorType child_end(NodeType *N) { 376 static inline ChildIteratorType child_end(NodeType *N) {
395 return N->Uses.end(); 377 return N->Uses.end();
396 } 378 }
397 }; 379 };
398 template<> struct GraphTraits<ArgumentGraph*> 380 template <>
399 : public GraphTraits<ArgumentGraphNode*> { 381 struct GraphTraits<ArgumentGraph *> : public GraphTraits<ArgumentGraphNode *> {
400 static NodeType *getEntryNode(ArgumentGraph *AG) { 382 static NodeType *getEntryNode(ArgumentGraph *AG) {
401 return AG->getEntryNode(); 383 return AG->getEntryNode();
402 } 384 }
403 static ChildIteratorType nodes_begin(ArgumentGraph *AG) { 385 static ChildIteratorType nodes_begin(ArgumentGraph *AG) {
404 return AG->begin(); 386 return AG->begin();
405 } 387 }
406 static ChildIteratorType nodes_end(ArgumentGraph *AG) { 388 static ChildIteratorType nodes_end(ArgumentGraph *AG) { return AG->end(); }
407 return AG->end(); 389 };
408 } 390 }
409 }; 391
410 } 392 /// Returns Attribute::None, Attribute::ReadOnly or Attribute::ReadNone.
411
412 // Returns Attribute::None, Attribute::ReadOnly or Attribute::ReadNone.
413 static Attribute::AttrKind 393 static Attribute::AttrKind
414 determinePointerReadAttrs(Argument *A, 394 determinePointerReadAttrs(Argument *A,
415 const SmallPtrSet<Argument*, 8> &SCCNodes) { 395 const SmallPtrSet<Argument *, 8> &SCCNodes) {
416 396
417 SmallVector<Use*, 32> Worklist; 397 SmallVector<Use *, 32> Worklist;
418 SmallSet<Use*, 32> Visited; 398 SmallSet<Use *, 32> Visited;
419 int Count = 0;
420 399
421 // inalloca arguments are always clobbered by the call. 400 // inalloca arguments are always clobbered by the call.
422 if (A->hasInAllocaAttr()) 401 if (A->hasInAllocaAttr())
423 return Attribute::None; 402 return Attribute::None;
424 403
425 bool IsRead = false; 404 bool IsRead = false;
426 // We don't need to track IsWritten. If A is written to, return immediately. 405 // We don't need to track IsWritten. If A is written to, return immediately.
427 406
428 for (Use &U : A->uses()) { 407 for (Use &U : A->uses()) {
429 if (Count++ >= 20)
430 return Attribute::None;
431
432 Visited.insert(&U); 408 Visited.insert(&U);
433 Worklist.push_back(&U); 409 Worklist.push_back(&U);
434 } 410 }
435 411
436 while (!Worklist.empty()) { 412 while (!Worklist.empty()) {
516 } 492 }
517 493
518 return IsRead ? Attribute::ReadOnly : Attribute::ReadNone; 494 return IsRead ? Attribute::ReadOnly : Attribute::ReadNone;
519 } 495 }
520 496
521 /// AddArgumentAttrs - Deduce nocapture attributes for the SCC. 497 /// Deduce nocapture attributes for the SCC.
522 bool FunctionAttrs::AddArgumentAttrs(const CallGraphSCC &SCC) { 498 bool FunctionAttrs::AddArgumentAttrs(const CallGraphSCC &SCC) {
523 bool Changed = false; 499 bool Changed = false;
524 500
525 SmallPtrSet<Function*, 8> SCCNodes; 501 SmallPtrSet<Function *, 8> SCCNodes;
526 502
527 // Fill SCCNodes with the elements of the SCC. Used for quickly 503 // Fill SCCNodes with the elements of the SCC. Used for quickly
528 // looking up whether a given CallGraphNode is in this SCC. 504 // looking up whether a given CallGraphNode is in this SCC.
529 for (CallGraphSCC::iterator I = SCC.begin(), E = SCC.end(); I != E; ++I) { 505 for (CallGraphSCC::iterator I = SCC.begin(), E = SCC.end(); I != E; ++I) {
530 Function *F = (*I)->getFunction(); 506 Function *F = (*I)->getFunction();
555 531
556 // Functions that are readonly (or readnone) and nounwind and don't return 532 // Functions that are readonly (or readnone) and nounwind and don't return
557 // a value can't capture arguments. Don't analyze them. 533 // a value can't capture arguments. Don't analyze them.
558 if (F->onlyReadsMemory() && F->doesNotThrow() && 534 if (F->onlyReadsMemory() && F->doesNotThrow() &&
559 F->getReturnType()->isVoidTy()) { 535 F->getReturnType()->isVoidTy()) {
560 for (Function::arg_iterator A = F->arg_begin(), E = F->arg_end(); 536 for (Function::arg_iterator A = F->arg_begin(), E = F->arg_end(); A != E;
561 A != E; ++A) { 537 ++A) {
562 if (A->getType()->isPointerTy() && !A->hasNoCaptureAttr()) { 538 if (A->getType()->isPointerTy() && !A->hasNoCaptureAttr()) {
563 A->addAttr(AttributeSet::get(F->getContext(), A->getArgNo() + 1, B)); 539 A->addAttr(AttributeSet::get(F->getContext(), A->getArgNo() + 1, B));
564 ++NumNoCapture; 540 ++NumNoCapture;
565 Changed = true; 541 Changed = true;
566 } 542 }
567 } 543 }
568 continue; 544 continue;
569 } 545 }
570 546
571 for (Function::arg_iterator A = F->arg_begin(), E = F->arg_end(); 547 for (Function::arg_iterator A = F->arg_begin(), E = F->arg_end(); A != E;
572 A != E; ++A) { 548 ++A) {
573 if (!A->getType()->isPointerTy()) continue; 549 if (!A->getType()->isPointerTy())
550 continue;
574 bool HasNonLocalUses = false; 551 bool HasNonLocalUses = false;
575 if (!A->hasNoCaptureAttr()) { 552 if (!A->hasNoCaptureAttr()) {
576 ArgumentUsesTracker Tracker(SCCNodes); 553 ArgumentUsesTracker Tracker(SCCNodes);
577 PointerMayBeCaptured(A, &Tracker); 554 PointerMayBeCaptured(A, &Tracker);
578 if (!Tracker.Captured) { 555 if (!Tracker.Captured) {
579 if (Tracker.Uses.empty()) { 556 if (Tracker.Uses.empty()) {
580 // If it's trivially not captured, mark it nocapture now. 557 // If it's trivially not captured, mark it nocapture now.
581 A->addAttr(AttributeSet::get(F->getContext(), A->getArgNo()+1, B)); 558 A->addAttr(
559 AttributeSet::get(F->getContext(), A->getArgNo() + 1, B));
582 ++NumNoCapture; 560 ++NumNoCapture;
583 Changed = true; 561 Changed = true;
584 } else { 562 } else {
585 // If it's not trivially captured and not trivially not captured, 563 // If it's not trivially captured and not trivially not captured,
586 // then it must be calling into another function in our SCC. Save 564 // then it must be calling into another function in our SCC. Save
587 // its particulars for Argument-SCC analysis later. 565 // its particulars for Argument-SCC analysis later.
588 ArgumentGraphNode *Node = AG[A]; 566 ArgumentGraphNode *Node = AG[A];
589 for (SmallVectorImpl<Argument*>::iterator UI = Tracker.Uses.begin(), 567 for (SmallVectorImpl<Argument *>::iterator
590 UE = Tracker.Uses.end(); UI != UE; ++UI) { 568 UI = Tracker.Uses.begin(),
569 UE = Tracker.Uses.end();
570 UI != UE; ++UI) {
591 Node->Uses.push_back(AG[*UI]); 571 Node->Uses.push_back(AG[*UI]);
592 if (*UI != A) 572 if (*UI != A)
593 HasNonLocalUses = true; 573 HasNonLocalUses = true;
594 } 574 }
595 } 575 }
599 if (!HasNonLocalUses && !A->onlyReadsMemory()) { 579 if (!HasNonLocalUses && !A->onlyReadsMemory()) {
600 // Can we determine that it's readonly/readnone without doing an SCC? 580 // Can we determine that it's readonly/readnone without doing an SCC?
601 // Note that we don't allow any calls at all here, or else our result 581 // Note that we don't allow any calls at all here, or else our result
602 // will be dependent on the iteration order through the functions in the 582 // will be dependent on the iteration order through the functions in the
603 // SCC. 583 // SCC.
604 SmallPtrSet<Argument*, 8> Self; 584 SmallPtrSet<Argument *, 8> Self;
605 Self.insert(A); 585 Self.insert(A);
606 Attribute::AttrKind R = determinePointerReadAttrs(A, Self); 586 Attribute::AttrKind R = determinePointerReadAttrs(A, Self);
607 if (R != Attribute::None) { 587 if (R != Attribute::None) {
608 AttrBuilder B; 588 AttrBuilder B;
609 B.addAttribute(R); 589 B.addAttribute(R);
620 // show up as ArgumentGraphNode objects with an empty Uses list, and for 600 // show up as ArgumentGraphNode objects with an empty Uses list, and for
621 // these nodes the final decision about whether they capture has already been 601 // these nodes the final decision about whether they capture has already been
622 // made. If the definition doesn't have a 'nocapture' attribute by now, it 602 // made. If the definition doesn't have a 'nocapture' attribute by now, it
623 // captures. 603 // captures.
624 604
625 for (scc_iterator<ArgumentGraph*> I = scc_begin(&AG); !I.isAtEnd(); ++I) { 605 for (scc_iterator<ArgumentGraph *> I = scc_begin(&AG); !I.isAtEnd(); ++I) {
626 const std::vector<ArgumentGraphNode *> &ArgumentSCC = *I; 606 const std::vector<ArgumentGraphNode *> &ArgumentSCC = *I;
627 if (ArgumentSCC.size() == 1) { 607 if (ArgumentSCC.size() == 1) {
628 if (!ArgumentSCC[0]->Definition) continue; // synthetic root node 608 if (!ArgumentSCC[0]->Definition)
609 continue; // synthetic root node
629 610
630 // eg. "void f(int* x) { if (...) f(x); }" 611 // eg. "void f(int* x) { if (...) f(x); }"
631 if (ArgumentSCC[0]->Uses.size() == 1 && 612 if (ArgumentSCC[0]->Uses.size() == 1 &&
632 ArgumentSCC[0]->Uses[0] == ArgumentSCC[0]) { 613 ArgumentSCC[0]->Uses[0] == ArgumentSCC[0]) {
633 Argument *A = ArgumentSCC[0]->Definition; 614 Argument *A = ArgumentSCC[0]->Definition;
645 if (Node->Uses.empty()) { 626 if (Node->Uses.empty()) {
646 if (!Node->Definition->hasNoCaptureAttr()) 627 if (!Node->Definition->hasNoCaptureAttr())
647 SCCCaptured = true; 628 SCCCaptured = true;
648 } 629 }
649 } 630 }
650 if (SCCCaptured) continue; 631 if (SCCCaptured)
651 632 continue;
652 SmallPtrSet<Argument*, 8> ArgumentSCCNodes; 633
634 SmallPtrSet<Argument *, 8> ArgumentSCCNodes;
653 // Fill ArgumentSCCNodes with the elements of the ArgumentSCC. Used for 635 // Fill ArgumentSCCNodes with the elements of the ArgumentSCC. Used for
654 // quickly looking up whether a given Argument is in this ArgumentSCC. 636 // quickly looking up whether a given Argument is in this ArgumentSCC.
655 for (auto I = ArgumentSCC.begin(), E = ArgumentSCC.end(); I != E; ++I) { 637 for (auto I = ArgumentSCC.begin(), E = ArgumentSCC.end(); I != E; ++I) {
656 ArgumentSCCNodes.insert((*I)->Definition); 638 ArgumentSCCNodes.insert((*I)->Definition);
657 } 639 }
658 640
659 for (auto I = ArgumentSCC.begin(), E = ArgumentSCC.end(); 641 for (auto I = ArgumentSCC.begin(), E = ArgumentSCC.end();
660 I != E && !SCCCaptured; ++I) { 642 I != E && !SCCCaptured; ++I) {
661 ArgumentGraphNode *N = *I; 643 ArgumentGraphNode *N = *I;
662 for (SmallVectorImpl<ArgumentGraphNode*>::iterator UI = N->Uses.begin(), 644 for (SmallVectorImpl<ArgumentGraphNode *>::iterator UI = N->Uses.begin(),
663 UE = N->Uses.end(); UI != UE; ++UI) { 645 UE = N->Uses.end();
646 UI != UE; ++UI) {
664 Argument *A = (*UI)->Definition; 647 Argument *A = (*UI)->Definition;
665 if (A->hasNoCaptureAttr() || ArgumentSCCNodes.count(A)) 648 if (A->hasNoCaptureAttr() || ArgumentSCCNodes.count(A))
666 continue; 649 continue;
667 SCCCaptured = true; 650 SCCCaptured = true;
668 break; 651 break;
669 } 652 }
670 } 653 }
671 if (SCCCaptured) continue; 654 if (SCCCaptured)
655 continue;
672 656
673 for (unsigned i = 0, e = ArgumentSCC.size(); i != e; ++i) { 657 for (unsigned i = 0, e = ArgumentSCC.size(); i != e; ++i) {
674 Argument *A = ArgumentSCC[i]->Definition; 658 Argument *A = ArgumentSCC[i]->Definition;
675 A->addAttr(AttributeSet::get(A->getContext(), A->getArgNo() + 1, B)); 659 A->addAttr(AttributeSet::get(A->getContext(), A->getArgNo() + 1, B));
676 ++NumNoCapture; 660 ++NumNoCapture;
701 ReadAttr = K; 685 ReadAttr = K;
702 break; 686 break;
703 } 687 }
704 688
705 if (ReadAttr != Attribute::None) { 689 if (ReadAttr != Attribute::None) {
706 AttrBuilder B; 690 AttrBuilder B, R;
707 B.addAttribute(ReadAttr); 691 B.addAttribute(ReadAttr);
692 R.addAttribute(Attribute::ReadOnly).addAttribute(Attribute::ReadNone);
708 for (unsigned i = 0, e = ArgumentSCC.size(); i != e; ++i) { 693 for (unsigned i = 0, e = ArgumentSCC.size(); i != e; ++i) {
709 Argument *A = ArgumentSCC[i]->Definition; 694 Argument *A = ArgumentSCC[i]->Definition;
695 // Clear out existing readonly/readnone attributes
696 A->removeAttr(AttributeSet::get(A->getContext(), A->getArgNo() + 1, R));
710 A->addAttr(AttributeSet::get(A->getContext(), A->getArgNo() + 1, B)); 697 A->addAttr(AttributeSet::get(A->getContext(), A->getArgNo() + 1, B));
711 ReadAttr == Attribute::ReadOnly ? ++NumReadOnlyArg : ++NumReadNoneArg; 698 ReadAttr == Attribute::ReadOnly ? ++NumReadOnlyArg : ++NumReadNoneArg;
712 Changed = true; 699 Changed = true;
713 } 700 }
714 } 701 }
715 } 702 }
716 703
717 return Changed; 704 return Changed;
718 } 705 }
719 706
720 /// IsFunctionMallocLike - A function is malloc-like if it returns either null 707 /// Tests whether a function is "malloc-like".
721 /// or a pointer that doesn't alias any other pointer visible to the caller. 708 ///
722 bool FunctionAttrs::IsFunctionMallocLike(Function *F, 709 /// A function is "malloc-like" if it returns either null or a pointer that
723 SmallPtrSet<Function*, 8> &SCCNodes) const { 710 /// doesn't alias any other pointer visible to the caller.
711 static bool isFunctionMallocLike(Function *F,
712 SmallPtrSet<Function *, 8> &SCCNodes) {
724 SmallSetVector<Value *, 8> FlowsToReturn; 713 SmallSetVector<Value *, 8> FlowsToReturn;
725 for (Function::iterator I = F->begin(), E = F->end(); I != E; ++I) 714 for (Function::iterator I = F->begin(), E = F->end(); I != E; ++I)
726 if (ReturnInst *Ret = dyn_cast<ReturnInst>(I->getTerminator())) 715 if (ReturnInst *Ret = dyn_cast<ReturnInst>(I->getTerminator()))
727 FlowsToReturn.insert(Ret->getReturnValue()); 716 FlowsToReturn.insert(Ret->getReturnValue());
728 717
739 if (isa<Argument>(RetVal)) 728 if (isa<Argument>(RetVal))
740 return false; 729 return false;
741 730
742 if (Instruction *RVI = dyn_cast<Instruction>(RetVal)) 731 if (Instruction *RVI = dyn_cast<Instruction>(RetVal))
743 switch (RVI->getOpcode()) { 732 switch (RVI->getOpcode()) {
744 // Extend the analysis by looking upwards. 733 // Extend the analysis by looking upwards.
745 case Instruction::BitCast: 734 case Instruction::BitCast:
746 case Instruction::GetElementPtr: 735 case Instruction::GetElementPtr:
747 case Instruction::AddrSpaceCast: 736 case Instruction::AddrSpaceCast:
748 FlowsToReturn.insert(RVI->getOperand(0)); 737 FlowsToReturn.insert(RVI->getOperand(0));
749 continue; 738 continue;
750 case Instruction::Select: { 739 case Instruction::Select: {
751 SelectInst *SI = cast<SelectInst>(RVI); 740 SelectInst *SI = cast<SelectInst>(RVI);
752 FlowsToReturn.insert(SI->getTrueValue()); 741 FlowsToReturn.insert(SI->getTrueValue());
753 FlowsToReturn.insert(SI->getFalseValue()); 742 FlowsToReturn.insert(SI->getFalseValue());
754 continue; 743 continue;
755 } 744 }
756 case Instruction::PHI: { 745 case Instruction::PHI: {
757 PHINode *PN = cast<PHINode>(RVI); 746 PHINode *PN = cast<PHINode>(RVI);
758 for (int i = 0, e = PN->getNumIncomingValues(); i != e; ++i) 747 for (Value *IncValue : PN->incoming_values())
759 FlowsToReturn.insert(PN->getIncomingValue(i)); 748 FlowsToReturn.insert(IncValue);
760 continue; 749 continue;
761 } 750 }
762 751
763 // Check whether the pointer came from an allocation. 752 // Check whether the pointer came from an allocation.
764 case Instruction::Alloca: 753 case Instruction::Alloca:
754 break;
755 case Instruction::Call:
756 case Instruction::Invoke: {
757 CallSite CS(RVI);
758 if (CS.paramHasAttr(0, Attribute::NoAlias))
765 break; 759 break;
766 case Instruction::Call: 760 if (CS.getCalledFunction() && SCCNodes.count(CS.getCalledFunction()))
767 case Instruction::Invoke: { 761 break;
768 CallSite CS(RVI); 762 } // fall-through
769 if (CS.paramHasAttr(0, Attribute::NoAlias)) 763 default:
770 break; 764 return false; // Did not come from an allocation.
771 if (CS.getCalledFunction() &&
772 SCCNodes.count(CS.getCalledFunction()))
773 break;
774 } // fall-through
775 default:
776 return false; // Did not come from an allocation.
777 } 765 }
778 766
779 if (PointerMayBeCaptured(RetVal, false, /*StoreCaptures=*/false)) 767 if (PointerMayBeCaptured(RetVal, false, /*StoreCaptures=*/false))
780 return false; 768 return false;
781 } 769 }
782 770
783 return true; 771 return true;
784 } 772 }
785 773
786 /// AddNoAliasAttrs - Deduce noalias attributes for the SCC. 774 /// Deduce noalias attributes for the SCC.
787 bool FunctionAttrs::AddNoAliasAttrs(const CallGraphSCC &SCC) { 775 bool FunctionAttrs::AddNoAliasAttrs(const CallGraphSCC &SCC) {
788 SmallPtrSet<Function*, 8> SCCNodes; 776 SmallPtrSet<Function *, 8> SCCNodes;
789 777
790 // Fill SCCNodes with the elements of the SCC. Used for quickly 778 // Fill SCCNodes with the elements of the SCC. Used for quickly
791 // looking up whether a given CallGraphNode is in this SCC. 779 // looking up whether a given CallGraphNode is in this SCC.
792 for (CallGraphSCC::iterator I = SCC.begin(), E = SCC.end(); I != E; ++I) 780 for (CallGraphSCC::iterator I = SCC.begin(), E = SCC.end(); I != E; ++I)
793 SCCNodes.insert((*I)->getFunction()); 781 SCCNodes.insert((*I)->getFunction());
808 // Definitions with weak linkage may be overridden at linktime, so 796 // Definitions with weak linkage may be overridden at linktime, so
809 // treat them like declarations. 797 // treat them like declarations.
810 if (F->isDeclaration() || F->mayBeOverridden()) 798 if (F->isDeclaration() || F->mayBeOverridden())
811 return false; 799 return false;
812 800
813 // We annotate noalias return values, which are only applicable to 801 // We annotate noalias return values, which are only applicable to
814 // pointer types. 802 // pointer types.
815 if (!F->getReturnType()->isPointerTy()) 803 if (!F->getReturnType()->isPointerTy())
816 continue; 804 continue;
817 805
818 if (!IsFunctionMallocLike(F, SCCNodes)) 806 if (!isFunctionMallocLike(F, SCCNodes))
819 return false; 807 return false;
820 } 808 }
821 809
822 bool MadeChange = false; 810 bool MadeChange = false;
823 for (CallGraphSCC::iterator I = SCC.begin(), E = SCC.end(); I != E; ++I) { 811 for (CallGraphSCC::iterator I = SCC.begin(), E = SCC.end(); I != E; ++I) {
831 } 819 }
832 820
833 return MadeChange; 821 return MadeChange;
834 } 822 }
835 823
836 /// inferPrototypeAttributes - Analyze the name and prototype of the 824 /// Tests whether this function is known to not return null.
837 /// given function and set any applicable attributes. Returns true 825 ///
838 /// if any attributes were set and false otherwise. 826 /// Requires that the function returns a pointer.
839 bool FunctionAttrs::inferPrototypeAttributes(Function &F) { 827 ///
828 /// Returns true if it believes the function will not return a null, and sets
829 /// \p Speculative based on whether the returned conclusion is a speculative
830 /// conclusion due to SCC calls.
831 static bool isReturnNonNull(Function *F, SmallPtrSet<Function *, 8> &SCCNodes,
832 const TargetLibraryInfo &TLI, bool &Speculative) {
833 assert(F->getReturnType()->isPointerTy() &&
834 "nonnull only meaningful on pointer types");
835 Speculative = false;
836
837 SmallSetVector<Value *, 8> FlowsToReturn;
838 for (BasicBlock &BB : *F)
839 if (auto *Ret = dyn_cast<ReturnInst>(BB.getTerminator()))
840 FlowsToReturn.insert(Ret->getReturnValue());
841
842 for (unsigned i = 0; i != FlowsToReturn.size(); ++i) {
843 Value *RetVal = FlowsToReturn[i];
844
845 // If this value is locally known to be non-null, we're good
846 if (isKnownNonNull(RetVal, &TLI))
847 continue;
848
849 // Otherwise, we need to look upwards since we can't make any local
850 // conclusions.
851 Instruction *RVI = dyn_cast<Instruction>(RetVal);
852 if (!RVI)
853 return false;
854 switch (RVI->getOpcode()) {
855 // Extend the analysis by looking upwards.
856 case Instruction::BitCast:
857 case Instruction::GetElementPtr:
858 case Instruction::AddrSpaceCast:
859 FlowsToReturn.insert(RVI->getOperand(0));
860 continue;
861 case Instruction::Select: {
862 SelectInst *SI = cast<SelectInst>(RVI);
863 FlowsToReturn.insert(SI->getTrueValue());
864 FlowsToReturn.insert(SI->getFalseValue());
865 continue;
866 }
867 case Instruction::PHI: {
868 PHINode *PN = cast<PHINode>(RVI);
869 for (int i = 0, e = PN->getNumIncomingValues(); i != e; ++i)
870 FlowsToReturn.insert(PN->getIncomingValue(i));
871 continue;
872 }
873 case Instruction::Call:
874 case Instruction::Invoke: {
875 CallSite CS(RVI);
876 Function *Callee = CS.getCalledFunction();
877 // A call to a node within the SCC is assumed to return null until
878 // proven otherwise
879 if (Callee && SCCNodes.count(Callee)) {
880 Speculative = true;
881 continue;
882 }
883 return false;
884 }
885 default:
886 return false; // Unknown source, may be null
887 };
888 llvm_unreachable("should have either continued or returned");
889 }
890
891 return true;
892 }
893
894 /// Deduce nonnull attributes for the SCC.
895 bool FunctionAttrs::AddNonNullAttrs(const CallGraphSCC &SCC) {
896 SmallPtrSet<Function *, 8> SCCNodes;
897
898 // Fill SCCNodes with the elements of the SCC. Used for quickly
899 // looking up whether a given CallGraphNode is in this SCC.
900 for (CallGraphSCC::iterator I = SCC.begin(), E = SCC.end(); I != E; ++I)
901 SCCNodes.insert((*I)->getFunction());
902
903 // Speculative that all functions in the SCC return only nonnull
904 // pointers. We may refute this as we analyze functions.
905 bool SCCReturnsNonNull = true;
906
907 bool MadeChange = false;
908
909 // Check each function in turn, determining which functions return nonnull
910 // pointers.
911 for (CallGraphSCC::iterator I = SCC.begin(), E = SCC.end(); I != E; ++I) {
912 Function *F = (*I)->getFunction();
913
914 if (!F || F->hasFnAttribute(Attribute::OptimizeNone))
915 // External node or node we don't want to optimize - skip it;
916 return false;
917
918 // Already nonnull.
919 if (F->getAttributes().hasAttribute(AttributeSet::ReturnIndex,
920 Attribute::NonNull))
921 continue;
922
923 // Definitions with weak linkage may be overridden at linktime, so
924 // treat them like declarations.
925 if (F->isDeclaration() || F->mayBeOverridden())
926 return false;
927
928 // We annotate nonnull return values, which are only applicable to
929 // pointer types.
930 if (!F->getReturnType()->isPointerTy())
931 continue;
932
933 bool Speculative = false;
934 if (isReturnNonNull(F, SCCNodes, *TLI, Speculative)) {
935 if (!Speculative) {
936 // Mark the function eagerly since we may discover a function
937 // which prevents us from speculating about the entire SCC
938 DEBUG(dbgs() << "Eagerly marking " << F->getName() << " as nonnull\n");
939 F->addAttribute(AttributeSet::ReturnIndex, Attribute::NonNull);
940 ++NumNonNullReturn;
941 MadeChange = true;
942 }
943 continue;
944 }
945 // At least one function returns something which could be null, can't
946 // speculate any more.
947 SCCReturnsNonNull = false;
948 }
949
950 if (SCCReturnsNonNull) {
951 for (CallGraphSCC::iterator I = SCC.begin(), E = SCC.end(); I != E; ++I) {
952 Function *F = (*I)->getFunction();
953 if (F->getAttributes().hasAttribute(AttributeSet::ReturnIndex,
954 Attribute::NonNull) ||
955 !F->getReturnType()->isPointerTy())
956 continue;
957
958 DEBUG(dbgs() << "SCC marking " << F->getName() << " as nonnull\n");
959 F->addAttribute(AttributeSet::ReturnIndex, Attribute::NonNull);
960 ++NumNonNullReturn;
961 MadeChange = true;
962 }
963 }
964
965 return MadeChange;
966 }
967
968 static void setDoesNotAccessMemory(Function &F) {
969 if (!F.doesNotAccessMemory()) {
970 F.setDoesNotAccessMemory();
971 ++NumAnnotated;
972 }
973 }
974
975 static void setOnlyReadsMemory(Function &F) {
976 if (!F.onlyReadsMemory()) {
977 F.setOnlyReadsMemory();
978 ++NumAnnotated;
979 }
980 }
981
982 static void setDoesNotThrow(Function &F) {
983 if (!F.doesNotThrow()) {
984 F.setDoesNotThrow();
985 ++NumAnnotated;
986 }
987 }
988
989 static void setDoesNotCapture(Function &F, unsigned n) {
990 if (!F.doesNotCapture(n)) {
991 F.setDoesNotCapture(n);
992 ++NumAnnotated;
993 }
994 }
995
996 static void setOnlyReadsMemory(Function &F, unsigned n) {
997 if (!F.onlyReadsMemory(n)) {
998 F.setOnlyReadsMemory(n);
999 ++NumAnnotated;
1000 }
1001 }
1002
1003 static void setDoesNotAlias(Function &F, unsigned n) {
1004 if (!F.doesNotAlias(n)) {
1005 F.setDoesNotAlias(n);
1006 ++NumAnnotated;
1007 }
1008 }
1009
1010 /// Analyze the name and prototype of the given function and set any applicable
1011 /// attributes.
1012 ///
1013 /// Returns true if any attributes were set and false otherwise.
1014 static bool inferPrototypeAttributes(Function &F, const TargetLibraryInfo &TLI) {
840 if (F.hasFnAttribute(Attribute::OptimizeNone)) 1015 if (F.hasFnAttribute(Attribute::OptimizeNone))
841 return false; 1016 return false;
842 1017
843 FunctionType *FTy = F.getFunctionType(); 1018 FunctionType *FTy = F.getFunctionType();
844 LibFunc::Func TheLibFunc; 1019 LibFunc::Func TheLibFunc;
845 if (!(TLI->getLibFunc(F.getName(), TheLibFunc) && TLI->has(TheLibFunc))) 1020 if (!(TLI.getLibFunc(F.getName(), TheLibFunc) && TLI.has(TheLibFunc)))
846 return false; 1021 return false;
847 1022
848 switch (TheLibFunc) { 1023 switch (TheLibFunc) {
849 case LibFunc::strlen: 1024 case LibFunc::strlen:
850 if (FTy->getNumParams() != 1 || !FTy->getParamType(0)->isPointerTy()) 1025 if (FTy->getNumParams() != 1 || !FTy->getParamType(0)->isPointerTy())
853 setDoesNotThrow(F); 1028 setDoesNotThrow(F);
854 setDoesNotCapture(F, 1); 1029 setDoesNotCapture(F, 1);
855 break; 1030 break;
856 case LibFunc::strchr: 1031 case LibFunc::strchr:
857 case LibFunc::strrchr: 1032 case LibFunc::strrchr:
858 if (FTy->getNumParams() != 2 || 1033 if (FTy->getNumParams() != 2 || !FTy->getParamType(0)->isPointerTy() ||
859 !FTy->getParamType(0)->isPointerTy() ||
860 !FTy->getParamType(1)->isIntegerTy()) 1034 !FTy->getParamType(1)->isIntegerTy())
861 return false; 1035 return false;
862 setOnlyReadsMemory(F); 1036 setOnlyReadsMemory(F);
863 setDoesNotThrow(F); 1037 setDoesNotThrow(F);
864 break; 1038 break;
867 case LibFunc::strtof: 1041 case LibFunc::strtof:
868 case LibFunc::strtoul: 1042 case LibFunc::strtoul:
869 case LibFunc::strtoll: 1043 case LibFunc::strtoll:
870 case LibFunc::strtold: 1044 case LibFunc::strtold:
871 case LibFunc::strtoull: 1045 case LibFunc::strtoull:
872 if (FTy->getNumParams() < 2 || 1046 if (FTy->getNumParams() < 2 || !FTy->getParamType(1)->isPointerTy())
873 !FTy->getParamType(1)->isPointerTy())
874 return false; 1047 return false;
875 setDoesNotThrow(F); 1048 setDoesNotThrow(F);
876 setDoesNotCapture(F, 2); 1049 setDoesNotCapture(F, 2);
877 setOnlyReadsMemory(F, 1); 1050 setOnlyReadsMemory(F, 1);
878 break; 1051 break;
880 case LibFunc::stpcpy: 1053 case LibFunc::stpcpy:
881 case LibFunc::strcat: 1054 case LibFunc::strcat:
882 case LibFunc::strncat: 1055 case LibFunc::strncat:
883 case LibFunc::strncpy: 1056 case LibFunc::strncpy:
884 case LibFunc::stpncpy: 1057 case LibFunc::stpncpy:
885 if (FTy->getNumParams() < 2 || 1058 if (FTy->getNumParams() < 2 || !FTy->getParamType(1)->isPointerTy())
886 !FTy->getParamType(1)->isPointerTy())
887 return false; 1059 return false;
888 setDoesNotThrow(F); 1060 setDoesNotThrow(F);
889 setDoesNotCapture(F, 2); 1061 setDoesNotCapture(F, 2);
890 setOnlyReadsMemory(F, 2); 1062 setOnlyReadsMemory(F, 2);
891 break; 1063 break;
892 case LibFunc::strxfrm: 1064 case LibFunc::strxfrm:
893 if (FTy->getNumParams() != 3 || 1065 if (FTy->getNumParams() != 3 || !FTy->getParamType(0)->isPointerTy() ||
894 !FTy->getParamType(0)->isPointerTy() || 1066 !FTy->getParamType(1)->isPointerTy())
895 !FTy->getParamType(1)->isPointerTy()) 1067 return false;
896 return false; 1068 setDoesNotThrow(F);
897 setDoesNotThrow(F); 1069 setDoesNotCapture(F, 1);
898 setDoesNotCapture(F, 1); 1070 setDoesNotCapture(F, 2);
899 setDoesNotCapture(F, 2); 1071 setOnlyReadsMemory(F, 2);
900 setOnlyReadsMemory(F, 2); 1072 break;
901 break; 1073 case LibFunc::strcmp: // 0,1
902 case LibFunc::strcmp: //0,1 1074 case LibFunc::strspn: // 0,1
903 case LibFunc::strspn: // 0,1 1075 case LibFunc::strncmp: // 0,1
904 case LibFunc::strncmp: // 0,1 1076 case LibFunc::strcspn: // 0,1
905 case LibFunc::strcspn: //0,1 1077 case LibFunc::strcoll: // 0,1
906 case LibFunc::strcoll: //0,1 1078 case LibFunc::strcasecmp: // 0,1
907 case LibFunc::strcasecmp: // 0,1 1079 case LibFunc::strncasecmp: //
908 case LibFunc::strncasecmp: // 1080 if (FTy->getNumParams() < 2 || !FTy->getParamType(0)->isPointerTy() ||
909 if (FTy->getNumParams() < 2 ||
910 !FTy->getParamType(0)->isPointerTy() ||
911 !FTy->getParamType(1)->isPointerTy()) 1081 !FTy->getParamType(1)->isPointerTy())
912 return false; 1082 return false;
913 setOnlyReadsMemory(F); 1083 setOnlyReadsMemory(F);
914 setDoesNotThrow(F); 1084 setDoesNotThrow(F);
915 setDoesNotCapture(F, 1); 1085 setDoesNotCapture(F, 1);
955 setDoesNotCapture(F, 1); 1125 setDoesNotCapture(F, 1);
956 setOnlyReadsMemory(F, 1); 1126 setOnlyReadsMemory(F, 1);
957 break; 1127 break;
958 case LibFunc::stat: 1128 case LibFunc::stat:
959 case LibFunc::statvfs: 1129 case LibFunc::statvfs:
960 if (FTy->getNumParams() < 2 || 1130 if (FTy->getNumParams() < 2 || !FTy->getParamType(0)->isPointerTy() ||
961 !FTy->getParamType(0)->isPointerTy() ||
962 !FTy->getParamType(1)->isPointerTy()) 1131 !FTy->getParamType(1)->isPointerTy())
963 return false; 1132 return false;
964 setDoesNotThrow(F); 1133 setDoesNotThrow(F);
965 setDoesNotCapture(F, 1); 1134 setDoesNotCapture(F, 1);
966 setDoesNotCapture(F, 2); 1135 setDoesNotCapture(F, 2);
967 setOnlyReadsMemory(F, 1); 1136 setOnlyReadsMemory(F, 1);
968 break; 1137 break;
969 case LibFunc::sscanf: 1138 case LibFunc::sscanf:
970 if (FTy->getNumParams() < 2 || 1139 if (FTy->getNumParams() < 2 || !FTy->getParamType(0)->isPointerTy() ||
971 !FTy->getParamType(0)->isPointerTy() ||
972 !FTy->getParamType(1)->isPointerTy()) 1140 !FTy->getParamType(1)->isPointerTy())
973 return false; 1141 return false;
974 setDoesNotThrow(F); 1142 setDoesNotThrow(F);
975 setDoesNotCapture(F, 1); 1143 setDoesNotCapture(F, 1);
976 setDoesNotCapture(F, 2); 1144 setDoesNotCapture(F, 2);
977 setOnlyReadsMemory(F, 1); 1145 setOnlyReadsMemory(F, 1);
978 setOnlyReadsMemory(F, 2); 1146 setOnlyReadsMemory(F, 2);
979 break; 1147 break;
980 case LibFunc::sprintf: 1148 case LibFunc::sprintf:
981 if (FTy->getNumParams() < 2 || 1149 if (FTy->getNumParams() < 2 || !FTy->getParamType(0)->isPointerTy() ||
982 !FTy->getParamType(0)->isPointerTy() ||
983 !FTy->getParamType(1)->isPointerTy()) 1150 !FTy->getParamType(1)->isPointerTy())
984 return false; 1151 return false;
985 setDoesNotThrow(F); 1152 setDoesNotThrow(F);
986 setDoesNotCapture(F, 1); 1153 setDoesNotCapture(F, 1);
987 setDoesNotCapture(F, 2); 1154 setDoesNotCapture(F, 2);
988 setOnlyReadsMemory(F, 2); 1155 setOnlyReadsMemory(F, 2);
989 break; 1156 break;
990 case LibFunc::snprintf: 1157 case LibFunc::snprintf:
991 if (FTy->getNumParams() != 3 || 1158 if (FTy->getNumParams() != 3 || !FTy->getParamType(0)->isPointerTy() ||
992 !FTy->getParamType(0)->isPointerTy() ||
993 !FTy->getParamType(2)->isPointerTy()) 1159 !FTy->getParamType(2)->isPointerTy())
994 return false; 1160 return false;
995 setDoesNotThrow(F); 1161 setDoesNotThrow(F);
996 setDoesNotCapture(F, 1); 1162 setDoesNotCapture(F, 1);
997 setDoesNotCapture(F, 3); 1163 setDoesNotCapture(F, 3);
998 setOnlyReadsMemory(F, 3); 1164 setOnlyReadsMemory(F, 3);
999 break; 1165 break;
1000 case LibFunc::setitimer: 1166 case LibFunc::setitimer:
1001 if (FTy->getNumParams() != 3 || 1167 if (FTy->getNumParams() != 3 || !FTy->getParamType(1)->isPointerTy() ||
1002 !FTy->getParamType(1)->isPointerTy() ||
1003 !FTy->getParamType(2)->isPointerTy()) 1168 !FTy->getParamType(2)->isPointerTy())
1004 return false; 1169 return false;
1005 setDoesNotThrow(F); 1170 setDoesNotThrow(F);
1006 setDoesNotCapture(F, 2); 1171 setDoesNotCapture(F, 2);
1007 setDoesNotCapture(F, 3); 1172 setDoesNotCapture(F, 3);
1008 setOnlyReadsMemory(F, 2); 1173 setOnlyReadsMemory(F, 2);
1009 break; 1174 break;
1010 case LibFunc::system: 1175 case LibFunc::system:
1011 if (FTy->getNumParams() != 1 || 1176 if (FTy->getNumParams() != 1 || !FTy->getParamType(0)->isPointerTy())
1012 !FTy->getParamType(0)->isPointerTy())
1013 return false; 1177 return false;
1014 // May throw; "system" is a valid pthread cancellation point. 1178 // May throw; "system" is a valid pthread cancellation point.
1015 setDoesNotCapture(F, 1); 1179 setDoesNotCapture(F, 1);
1016 setOnlyReadsMemory(F, 1); 1180 setOnlyReadsMemory(F, 1);
1017 break; 1181 break;
1018 case LibFunc::malloc: 1182 case LibFunc::malloc:
1019 if (FTy->getNumParams() != 1 || 1183 if (FTy->getNumParams() != 1 || !FTy->getReturnType()->isPointerTy())
1020 !FTy->getReturnType()->isPointerTy())
1021 return false; 1184 return false;
1022 setDoesNotThrow(F); 1185 setDoesNotThrow(F);
1023 setDoesNotAlias(F, 0); 1186 setDoesNotAlias(F, 0);
1024 break; 1187 break;
1025 case LibFunc::memcmp: 1188 case LibFunc::memcmp:
1026 if (FTy->getNumParams() != 3 || 1189 if (FTy->getNumParams() != 3 || !FTy->getParamType(0)->isPointerTy() ||
1027 !FTy->getParamType(0)->isPointerTy() ||
1028 !FTy->getParamType(1)->isPointerTy()) 1190 !FTy->getParamType(1)->isPointerTy())
1029 return false; 1191 return false;
1030 setOnlyReadsMemory(F); 1192 setOnlyReadsMemory(F);
1031 setDoesNotThrow(F); 1193 setDoesNotThrow(F);
1032 setDoesNotCapture(F, 1); 1194 setDoesNotCapture(F, 1);
1040 setDoesNotThrow(F); 1202 setDoesNotThrow(F);
1041 break; 1203 break;
1042 case LibFunc::modf: 1204 case LibFunc::modf:
1043 case LibFunc::modff: 1205 case LibFunc::modff:
1044 case LibFunc::modfl: 1206 case LibFunc::modfl:
1045 if (FTy->getNumParams() < 2 || 1207 if (FTy->getNumParams() < 2 || !FTy->getParamType(1)->isPointerTy())
1046 !FTy->getParamType(1)->isPointerTy())
1047 return false; 1208 return false;
1048 setDoesNotThrow(F); 1209 setDoesNotThrow(F);
1049 setDoesNotCapture(F, 2); 1210 setDoesNotCapture(F, 2);
1050 break; 1211 break;
1051 case LibFunc::memcpy: 1212 case LibFunc::memcpy:
1052 case LibFunc::memccpy: 1213 case LibFunc::memccpy:
1053 case LibFunc::memmove: 1214 case LibFunc::memmove:
1054 if (FTy->getNumParams() < 2 || 1215 if (FTy->getNumParams() < 2 || !FTy->getParamType(1)->isPointerTy())
1055 !FTy->getParamType(1)->isPointerTy())
1056 return false; 1216 return false;
1057 setDoesNotThrow(F); 1217 setDoesNotThrow(F);
1058 setDoesNotCapture(F, 2); 1218 setDoesNotCapture(F, 2);
1059 setOnlyReadsMemory(F, 2); 1219 setOnlyReadsMemory(F, 2);
1060 break; 1220 break;
1062 if (!FTy->getReturnType()->isPointerTy()) 1222 if (!FTy->getReturnType()->isPointerTy())
1063 return false; 1223 return false;
1064 setDoesNotAlias(F, 0); 1224 setDoesNotAlias(F, 0);
1065 break; 1225 break;
1066 case LibFunc::mkdir: 1226 case LibFunc::mkdir:
1067 if (FTy->getNumParams() == 0 || 1227 if (FTy->getNumParams() == 0 || !FTy->getParamType(0)->isPointerTy())
1068 !FTy->getParamType(0)->isPointerTy())
1069 return false; 1228 return false;
1070 setDoesNotThrow(F); 1229 setDoesNotThrow(F);
1071 setDoesNotCapture(F, 1); 1230 setDoesNotCapture(F, 1);
1072 setOnlyReadsMemory(F, 1); 1231 setOnlyReadsMemory(F, 1);
1073 break; 1232 break;
1074 case LibFunc::mktime: 1233 case LibFunc::mktime:
1075 if (FTy->getNumParams() == 0 || 1234 if (FTy->getNumParams() == 0 || !FTy->getParamType(0)->isPointerTy())
1076 !FTy->getParamType(0)->isPointerTy())
1077 return false; 1235 return false;
1078 setDoesNotThrow(F); 1236 setDoesNotThrow(F);
1079 setDoesNotCapture(F, 1); 1237 setDoesNotCapture(F, 1);
1080 break; 1238 break;
1081 case LibFunc::realloc: 1239 case LibFunc::realloc:
1082 if (FTy->getNumParams() != 2 || 1240 if (FTy->getNumParams() != 2 || !FTy->getParamType(0)->isPointerTy() ||
1083 !FTy->getParamType(0)->isPointerTy() ||
1084 !FTy->getReturnType()->isPointerTy()) 1241 !FTy->getReturnType()->isPointerTy())
1085 return false; 1242 return false;
1086 setDoesNotThrow(F); 1243 setDoesNotThrow(F);
1087 setDoesNotAlias(F, 0); 1244 setDoesNotAlias(F, 0);
1088 setDoesNotCapture(F, 1); 1245 setDoesNotCapture(F, 1);
1089 break; 1246 break;
1090 case LibFunc::read: 1247 case LibFunc::read:
1091 if (FTy->getNumParams() != 3 || 1248 if (FTy->getNumParams() != 3 || !FTy->getParamType(1)->isPointerTy())
1092 !FTy->getParamType(1)->isPointerTy())
1093 return false; 1249 return false;
1094 // May throw; "read" is a valid pthread cancellation point. 1250 // May throw; "read" is a valid pthread cancellation point.
1095 setDoesNotCapture(F, 2); 1251 setDoesNotCapture(F, 2);
1096 break; 1252 break;
1097 case LibFunc::rewind: 1253 case LibFunc::rewind:
1098 if (FTy->getNumParams() < 1 || 1254 if (FTy->getNumParams() < 1 || !FTy->getParamType(0)->isPointerTy())
1099 !FTy->getParamType(0)->isPointerTy())
1100 return false; 1255 return false;
1101 setDoesNotThrow(F); 1256 setDoesNotThrow(F);
1102 setDoesNotCapture(F, 1); 1257 setDoesNotCapture(F, 1);
1103 break; 1258 break;
1104 case LibFunc::rmdir: 1259 case LibFunc::rmdir:
1105 case LibFunc::remove: 1260 case LibFunc::remove:
1106 case LibFunc::realpath: 1261 case LibFunc::realpath:
1107 if (FTy->getNumParams() < 1 || 1262 if (FTy->getNumParams() < 1 || !FTy->getParamType(0)->isPointerTy())
1108 !FTy->getParamType(0)->isPointerTy())
1109 return false; 1263 return false;
1110 setDoesNotThrow(F); 1264 setDoesNotThrow(F);
1111 setDoesNotCapture(F, 1); 1265 setDoesNotCapture(F, 1);
1112 setOnlyReadsMemory(F, 1); 1266 setOnlyReadsMemory(F, 1);
1113 break; 1267 break;
1114 case LibFunc::rename: 1268 case LibFunc::rename:
1115 if (FTy->getNumParams() < 2 || 1269 if (FTy->getNumParams() < 2 || !FTy->getParamType(0)->isPointerTy() ||
1116 !FTy->getParamType(0)->isPointerTy() ||
1117 !FTy->getParamType(1)->isPointerTy()) 1270 !FTy->getParamType(1)->isPointerTy())
1118 return false; 1271 return false;
1119 setDoesNotThrow(F); 1272 setDoesNotThrow(F);
1120 setDoesNotCapture(F, 1); 1273 setDoesNotCapture(F, 1);
1121 setDoesNotCapture(F, 2); 1274 setDoesNotCapture(F, 2);
1122 setOnlyReadsMemory(F, 1); 1275 setOnlyReadsMemory(F, 1);
1123 setOnlyReadsMemory(F, 2); 1276 setOnlyReadsMemory(F, 2);
1124 break; 1277 break;
1125 case LibFunc::readlink: 1278 case LibFunc::readlink:
1126 if (FTy->getNumParams() < 2 || 1279 if (FTy->getNumParams() < 2 || !FTy->getParamType(0)->isPointerTy() ||
1127 !FTy->getParamType(0)->isPointerTy() ||
1128 !FTy->getParamType(1)->isPointerTy()) 1280 !FTy->getParamType(1)->isPointerTy())
1129 return false; 1281 return false;
1130 setDoesNotThrow(F); 1282 setDoesNotThrow(F);
1131 setDoesNotCapture(F, 1); 1283 setDoesNotCapture(F, 1);
1132 setDoesNotCapture(F, 2); 1284 setDoesNotCapture(F, 2);
1138 // May throw; "write" is a valid pthread cancellation point. 1290 // May throw; "write" is a valid pthread cancellation point.
1139 setDoesNotCapture(F, 2); 1291 setDoesNotCapture(F, 2);
1140 setOnlyReadsMemory(F, 2); 1292 setOnlyReadsMemory(F, 2);
1141 break; 1293 break;
1142 case LibFunc::bcopy: 1294 case LibFunc::bcopy:
1143 if (FTy->getNumParams() != 3 || 1295 if (FTy->getNumParams() != 3 || !FTy->getParamType(0)->isPointerTy() ||
1144 !FTy->getParamType(0)->isPointerTy() ||
1145 !FTy->getParamType(1)->isPointerTy()) 1296 !FTy->getParamType(1)->isPointerTy())
1146 return false; 1297 return false;
1147 setDoesNotThrow(F); 1298 setDoesNotThrow(F);
1148 setDoesNotCapture(F, 1); 1299 setDoesNotCapture(F, 1);
1149 setDoesNotCapture(F, 2); 1300 setDoesNotCapture(F, 2);
1150 setOnlyReadsMemory(F, 1); 1301 setOnlyReadsMemory(F, 1);
1151 break; 1302 break;
1152 case LibFunc::bcmp: 1303 case LibFunc::bcmp:
1153 if (FTy->getNumParams() != 3 || 1304 if (FTy->getNumParams() != 3 || !FTy->getParamType(0)->isPointerTy() ||
1154 !FTy->getParamType(0)->isPointerTy() ||
1155 !FTy->getParamType(1)->isPointerTy()) 1305 !FTy->getParamType(1)->isPointerTy())
1156 return false; 1306 return false;
1157 setDoesNotThrow(F); 1307 setDoesNotThrow(F);
1158 setOnlyReadsMemory(F); 1308 setOnlyReadsMemory(F);
1159 setDoesNotCapture(F, 1); 1309 setDoesNotCapture(F, 1);
1164 return false; 1314 return false;
1165 setDoesNotThrow(F); 1315 setDoesNotThrow(F);
1166 setDoesNotCapture(F, 1); 1316 setDoesNotCapture(F, 1);
1167 break; 1317 break;
1168 case LibFunc::calloc: 1318 case LibFunc::calloc:
1169 if (FTy->getNumParams() != 2 || 1319 if (FTy->getNumParams() != 2 || !FTy->getReturnType()->isPointerTy())
1170 !FTy->getReturnType()->isPointerTy())
1171 return false; 1320 return false;
1172 setDoesNotThrow(F); 1321 setDoesNotThrow(F);
1173 setDoesNotAlias(F, 0); 1322 setDoesNotAlias(F, 0);
1174 break; 1323 break;
1175 case LibFunc::chmod: 1324 case LibFunc::chmod:
1204 setDoesNotThrow(F); 1353 setDoesNotThrow(F);
1205 setDoesNotCapture(F, 1); 1354 setDoesNotCapture(F, 1);
1206 setOnlyReadsMemory(F, 1); 1355 setOnlyReadsMemory(F, 1);
1207 break; 1356 break;
1208 case LibFunc::fopen: 1357 case LibFunc::fopen:
1209 if (FTy->getNumParams() != 2 || 1358 if (FTy->getNumParams() != 2 || !FTy->getReturnType()->isPointerTy() ||
1210 !FTy->getReturnType()->isPointerTy() ||
1211 !FTy->getParamType(0)->isPointerTy() || 1359 !FTy->getParamType(0)->isPointerTy() ||
1212 !FTy->getParamType(1)->isPointerTy()) 1360 !FTy->getParamType(1)->isPointerTy())
1213 return false; 1361 return false;
1214 setDoesNotThrow(F); 1362 setDoesNotThrow(F);
1215 setDoesNotAlias(F, 0); 1363 setDoesNotAlias(F, 0);
1217 setDoesNotCapture(F, 2); 1365 setDoesNotCapture(F, 2);
1218 setOnlyReadsMemory(F, 1); 1366 setOnlyReadsMemory(F, 1);
1219 setOnlyReadsMemory(F, 2); 1367 setOnlyReadsMemory(F, 2);
1220 break; 1368 break;
1221 case LibFunc::fdopen: 1369 case LibFunc::fdopen:
1222 if (FTy->getNumParams() != 2 || 1370 if (FTy->getNumParams() != 2 || !FTy->getReturnType()->isPointerTy() ||
1223 !FTy->getReturnType()->isPointerTy() ||
1224 !FTy->getParamType(1)->isPointerTy()) 1371 !FTy->getParamType(1)->isPointerTy())
1225 return false; 1372 return false;
1226 setDoesNotThrow(F); 1373 setDoesNotThrow(F);
1227 setDoesNotAlias(F, 0); 1374 setDoesNotAlias(F, 0);
1228 setDoesNotCapture(F, 2); 1375 setDoesNotCapture(F, 2);
1264 return false; 1411 return false;
1265 setDoesNotThrow(F); 1412 setDoesNotThrow(F);
1266 setDoesNotCapture(F, 2); 1413 setDoesNotCapture(F, 2);
1267 break; 1414 break;
1268 case LibFunc::fgets: 1415 case LibFunc::fgets:
1269 if (FTy->getNumParams() != 3 || 1416 if (FTy->getNumParams() != 3 || !FTy->getParamType(0)->isPointerTy() ||
1270 !FTy->getParamType(0)->isPointerTy() ||
1271 !FTy->getParamType(2)->isPointerTy()) 1417 !FTy->getParamType(2)->isPointerTy())
1272 return false; 1418 return false;
1273 setDoesNotThrow(F); 1419 setDoesNotThrow(F);
1274 setDoesNotCapture(F, 3); 1420 setDoesNotCapture(F, 3);
1275 break; 1421 break;
1276 case LibFunc::fread: 1422 case LibFunc::fread:
1277 if (FTy->getNumParams() != 4 || 1423 if (FTy->getNumParams() != 4 || !FTy->getParamType(0)->isPointerTy() ||
1278 !FTy->getParamType(0)->isPointerTy() ||
1279 !FTy->getParamType(3)->isPointerTy()) 1424 !FTy->getParamType(3)->isPointerTy())
1280 return false; 1425 return false;
1281 setDoesNotThrow(F); 1426 setDoesNotThrow(F);
1282 setDoesNotCapture(F, 1); 1427 setDoesNotCapture(F, 1);
1283 setDoesNotCapture(F, 4); 1428 setDoesNotCapture(F, 4);
1284 break; 1429 break;
1285 case LibFunc::fwrite: 1430 case LibFunc::fwrite:
1286 if (FTy->getNumParams() != 4 || 1431 if (FTy->getNumParams() != 4 || !FTy->getParamType(0)->isPointerTy() ||
1287 !FTy->getParamType(0)->isPointerTy() ||
1288 !FTy->getParamType(3)->isPointerTy()) 1432 !FTy->getParamType(3)->isPointerTy())
1289 return false; 1433 return false;
1290 setDoesNotThrow(F); 1434 setDoesNotThrow(F);
1291 setDoesNotCapture(F, 1); 1435 setDoesNotCapture(F, 1);
1292 setDoesNotCapture(F, 4); 1436 setDoesNotCapture(F, 4);
1293 break; 1437 break;
1294 case LibFunc::fputs: 1438 case LibFunc::fputs:
1295 if (FTy->getNumParams() < 2 || 1439 if (FTy->getNumParams() < 2 || !FTy->getParamType(0)->isPointerTy() ||
1296 !FTy->getParamType(0)->isPointerTy() ||
1297 !FTy->getParamType(1)->isPointerTy()) 1440 !FTy->getParamType(1)->isPointerTy())
1298 return false; 1441 return false;
1299 setDoesNotThrow(F); 1442 setDoesNotThrow(F);
1300 setDoesNotCapture(F, 1); 1443 setDoesNotCapture(F, 1);
1301 setDoesNotCapture(F, 2); 1444 setDoesNotCapture(F, 2);
1302 setOnlyReadsMemory(F, 1); 1445 setOnlyReadsMemory(F, 1);
1303 break; 1446 break;
1304 case LibFunc::fscanf: 1447 case LibFunc::fscanf:
1305 case LibFunc::fprintf: 1448 case LibFunc::fprintf:
1306 if (FTy->getNumParams() < 2 || 1449 if (FTy->getNumParams() < 2 || !FTy->getParamType(0)->isPointerTy() ||
1307 !FTy->getParamType(0)->isPointerTy() ||
1308 !FTy->getParamType(1)->isPointerTy()) 1450 !FTy->getParamType(1)->isPointerTy())
1309 return false; 1451 return false;
1310 setDoesNotThrow(F); 1452 setDoesNotThrow(F);
1311 setDoesNotCapture(F, 1); 1453 setDoesNotCapture(F, 1);
1312 setDoesNotCapture(F, 2); 1454 setDoesNotCapture(F, 2);
1313 setOnlyReadsMemory(F, 2); 1455 setOnlyReadsMemory(F, 2);
1314 break; 1456 break;
1315 case LibFunc::fgetpos: 1457 case LibFunc::fgetpos:
1316 if (FTy->getNumParams() < 2 || 1458 if (FTy->getNumParams() < 2 || !FTy->getParamType(0)->isPointerTy() ||
1317 !FTy->getParamType(0)->isPointerTy() ||
1318 !FTy->getParamType(1)->isPointerTy()) 1459 !FTy->getParamType(1)->isPointerTy())
1319 return false; 1460 return false;
1320 setDoesNotThrow(F); 1461 setDoesNotThrow(F);
1321 setDoesNotCapture(F, 1); 1462 setDoesNotCapture(F, 1);
1322 setDoesNotCapture(F, 2); 1463 setDoesNotCapture(F, 2);
1379 setDoesNotCapture(F, 1); 1520 setDoesNotCapture(F, 1);
1380 setOnlyReadsMemory(F, 1); 1521 setOnlyReadsMemory(F, 1);
1381 break; 1522 break;
1382 case LibFunc::utime: 1523 case LibFunc::utime:
1383 case LibFunc::utimes: 1524 case LibFunc::utimes:
1384 if (FTy->getNumParams() != 2 || 1525 if (FTy->getNumParams() != 2 || !FTy->getParamType(0)->isPointerTy() ||
1385 !FTy->getParamType(0)->isPointerTy() ||
1386 !FTy->getParamType(1)->isPointerTy()) 1526 !FTy->getParamType(1)->isPointerTy())
1387 return false; 1527 return false;
1388 setDoesNotThrow(F); 1528 setDoesNotThrow(F);
1389 setDoesNotCapture(F, 1); 1529 setDoesNotCapture(F, 1);
1390 setDoesNotCapture(F, 2); 1530 setDoesNotCapture(F, 2);
1421 break; 1561 break;
1422 case LibFunc::putchar: 1562 case LibFunc::putchar:
1423 setDoesNotThrow(F); 1563 setDoesNotThrow(F);
1424 break; 1564 break;
1425 case LibFunc::popen: 1565 case LibFunc::popen:
1426 if (FTy->getNumParams() != 2 || 1566 if (FTy->getNumParams() != 2 || !FTy->getReturnType()->isPointerTy() ||
1427 !FTy->getReturnType()->isPointerTy() ||
1428 !FTy->getParamType(0)->isPointerTy() || 1567 !FTy->getParamType(0)->isPointerTy() ||
1429 !FTy->getParamType(1)->isPointerTy()) 1568 !FTy->getParamType(1)->isPointerTy())
1430 return false; 1569 return false;
1431 setDoesNotThrow(F); 1570 setDoesNotThrow(F);
1432 setDoesNotAlias(F, 0); 1571 setDoesNotAlias(F, 0);
1447 setDoesNotThrow(F); 1586 setDoesNotThrow(F);
1448 setDoesNotCapture(F, 1); 1587 setDoesNotCapture(F, 1);
1449 setOnlyReadsMemory(F, 1); 1588 setOnlyReadsMemory(F, 1);
1450 break; 1589 break;
1451 case LibFunc::vsscanf: 1590 case LibFunc::vsscanf:
1452 if (FTy->getNumParams() != 3 || 1591 if (FTy->getNumParams() != 3 || !FTy->getParamType(1)->isPointerTy() ||
1453 !FTy->getParamType(1)->isPointerTy() ||
1454 !FTy->getParamType(2)->isPointerTy()) 1592 !FTy->getParamType(2)->isPointerTy())
1455 return false; 1593 return false;
1456 setDoesNotThrow(F); 1594 setDoesNotThrow(F);
1457 setDoesNotCapture(F, 1); 1595 setDoesNotCapture(F, 1);
1458 setDoesNotCapture(F, 2); 1596 setDoesNotCapture(F, 2);
1459 setOnlyReadsMemory(F, 1); 1597 setOnlyReadsMemory(F, 1);
1460 setOnlyReadsMemory(F, 2); 1598 setOnlyReadsMemory(F, 2);
1461 break; 1599 break;
1462 case LibFunc::vfscanf: 1600 case LibFunc::vfscanf:
1463 if (FTy->getNumParams() != 3 || 1601 if (FTy->getNumParams() != 3 || !FTy->getParamType(1)->isPointerTy() ||
1464 !FTy->getParamType(1)->isPointerTy() ||
1465 !FTy->getParamType(2)->isPointerTy()) 1602 !FTy->getParamType(2)->isPointerTy())
1466 return false; 1603 return false;
1467 setDoesNotThrow(F); 1604 setDoesNotThrow(F);
1468 setDoesNotCapture(F, 1); 1605 setDoesNotCapture(F, 1);
1469 setDoesNotCapture(F, 2); 1606 setDoesNotCapture(F, 2);
1482 setDoesNotCapture(F, 1); 1619 setDoesNotCapture(F, 1);
1483 setOnlyReadsMemory(F, 1); 1620 setOnlyReadsMemory(F, 1);
1484 break; 1621 break;
1485 case LibFunc::vfprintf: 1622 case LibFunc::vfprintf:
1486 case LibFunc::vsprintf: 1623 case LibFunc::vsprintf:
1487 if (FTy->getNumParams() != 3 || 1624 if (FTy->getNumParams() != 3 || !FTy->getParamType(0)->isPointerTy() ||
1488 !FTy->getParamType(0)->isPointerTy() ||
1489 !FTy->getParamType(1)->isPointerTy()) 1625 !FTy->getParamType(1)->isPointerTy())
1490 return false; 1626 return false;
1491 setDoesNotThrow(F); 1627 setDoesNotThrow(F);
1492 setDoesNotCapture(F, 1); 1628 setDoesNotCapture(F, 1);
1493 setDoesNotCapture(F, 2); 1629 setDoesNotCapture(F, 2);
1494 setOnlyReadsMemory(F, 2); 1630 setOnlyReadsMemory(F, 2);
1495 break; 1631 break;
1496 case LibFunc::vsnprintf: 1632 case LibFunc::vsnprintf:
1497 if (FTy->getNumParams() != 4 || 1633 if (FTy->getNumParams() != 4 || !FTy->getParamType(0)->isPointerTy() ||
1498 !FTy->getParamType(0)->isPointerTy() ||
1499 !FTy->getParamType(2)->isPointerTy()) 1634 !FTy->getParamType(2)->isPointerTy())
1500 return false; 1635 return false;
1501 setDoesNotThrow(F); 1636 setDoesNotThrow(F);
1502 setDoesNotCapture(F, 1); 1637 setDoesNotCapture(F, 1);
1503 setDoesNotCapture(F, 3); 1638 setDoesNotCapture(F, 3);
1509 // May throw; "open" is a valid pthread cancellation point. 1644 // May throw; "open" is a valid pthread cancellation point.
1510 setDoesNotCapture(F, 1); 1645 setDoesNotCapture(F, 1);
1511 setOnlyReadsMemory(F, 1); 1646 setOnlyReadsMemory(F, 1);
1512 break; 1647 break;
1513 case LibFunc::opendir: 1648 case LibFunc::opendir:
1514 if (FTy->getNumParams() != 1 || 1649 if (FTy->getNumParams() != 1 || !FTy->getReturnType()->isPointerTy() ||
1515 !FTy->getReturnType()->isPointerTy() ||
1516 !FTy->getParamType(0)->isPointerTy()) 1650 !FTy->getParamType(0)->isPointerTy())
1517 return false; 1651 return false;
1518 setDoesNotThrow(F); 1652 setDoesNotThrow(F);
1519 setDoesNotAlias(F, 0); 1653 setDoesNotAlias(F, 0);
1520 setDoesNotCapture(F, 1); 1654 setDoesNotCapture(F, 1);
1538 case LibFunc::ntohs: 1672 case LibFunc::ntohs:
1539 setDoesNotThrow(F); 1673 setDoesNotThrow(F);
1540 setDoesNotAccessMemory(F); 1674 setDoesNotAccessMemory(F);
1541 break; 1675 break;
1542 case LibFunc::lstat: 1676 case LibFunc::lstat:
1543 if (FTy->getNumParams() != 2 || 1677 if (FTy->getNumParams() != 2 || !FTy->getParamType(0)->isPointerTy() ||
1544 !FTy->getParamType(0)->isPointerTy() ||
1545 !FTy->getParamType(1)->isPointerTy()) 1678 !FTy->getParamType(1)->isPointerTy())
1546 return false; 1679 return false;
1547 setDoesNotThrow(F); 1680 setDoesNotThrow(F);
1548 setDoesNotCapture(F, 1); 1681 setDoesNotCapture(F, 1);
1549 setDoesNotCapture(F, 2); 1682 setDoesNotCapture(F, 2);
1562 // May throw; places call through function pointer. 1695 // May throw; places call through function pointer.
1563 setDoesNotCapture(F, 4); 1696 setDoesNotCapture(F, 4);
1564 break; 1697 break;
1565 case LibFunc::dunder_strdup: 1698 case LibFunc::dunder_strdup:
1566 case LibFunc::dunder_strndup: 1699 case LibFunc::dunder_strndup:
1567 if (FTy->getNumParams() < 1 || 1700 if (FTy->getNumParams() < 1 || !FTy->getReturnType()->isPointerTy() ||
1568 !FTy->getReturnType()->isPointerTy() ||
1569 !FTy->getParamType(0)->isPointerTy()) 1701 !FTy->getParamType(0)->isPointerTy())
1570 return false; 1702 return false;
1571 setDoesNotThrow(F); 1703 setDoesNotThrow(F);
1572 setDoesNotAlias(F, 0); 1704 setDoesNotAlias(F, 0);
1573 setDoesNotCapture(F, 1); 1705 setDoesNotCapture(F, 1);
1574 setOnlyReadsMemory(F, 1); 1706 setOnlyReadsMemory(F, 1);
1575 break; 1707 break;
1576 case LibFunc::dunder_strtok_r: 1708 case LibFunc::dunder_strtok_r:
1577 if (FTy->getNumParams() != 3 || 1709 if (FTy->getNumParams() != 3 || !FTy->getParamType(1)->isPointerTy())
1578 !FTy->getParamType(1)->isPointerTy())
1579 return false; 1710 return false;
1580 setDoesNotThrow(F); 1711 setDoesNotThrow(F);
1581 setDoesNotCapture(F, 2); 1712 setDoesNotCapture(F, 2);
1582 setOnlyReadsMemory(F, 2); 1713 setOnlyReadsMemory(F, 2);
1583 break; 1714 break;
1592 return false; 1723 return false;
1593 setDoesNotThrow(F); 1724 setDoesNotThrow(F);
1594 setDoesNotCapture(F, 2); 1725 setDoesNotCapture(F, 2);
1595 break; 1726 break;
1596 case LibFunc::dunder_isoc99_scanf: 1727 case LibFunc::dunder_isoc99_scanf:
1597 if (FTy->getNumParams() < 1 || 1728 if (FTy->getNumParams() < 1 || !FTy->getParamType(0)->isPointerTy())
1598 !FTy->getParamType(0)->isPointerTy())
1599 return false; 1729 return false;
1600 setDoesNotThrow(F); 1730 setDoesNotThrow(F);
1601 setDoesNotCapture(F, 1); 1731 setDoesNotCapture(F, 1);
1602 setOnlyReadsMemory(F, 1); 1732 setOnlyReadsMemory(F, 1);
1603 break; 1733 break;
1604 case LibFunc::stat64: 1734 case LibFunc::stat64:
1605 case LibFunc::lstat64: 1735 case LibFunc::lstat64:
1606 case LibFunc::statvfs64: 1736 case LibFunc::statvfs64:
1607 if (FTy->getNumParams() < 1 || 1737 if (FTy->getNumParams() < 1 || !FTy->getParamType(0)->isPointerTy() ||
1608 !FTy->getParamType(0)->isPointerTy() ||
1609 !FTy->getParamType(1)->isPointerTy()) 1738 !FTy->getParamType(1)->isPointerTy())
1610 return false; 1739 return false;
1611 setDoesNotThrow(F); 1740 setDoesNotThrow(F);
1612 setDoesNotCapture(F, 1); 1741 setDoesNotCapture(F, 1);
1613 setDoesNotCapture(F, 2); 1742 setDoesNotCapture(F, 2);
1614 setOnlyReadsMemory(F, 1); 1743 setOnlyReadsMemory(F, 1);
1615 break; 1744 break;
1616 case LibFunc::dunder_isoc99_sscanf: 1745 case LibFunc::dunder_isoc99_sscanf:
1617 if (FTy->getNumParams() < 1 || 1746 if (FTy->getNumParams() < 1 || !FTy->getParamType(0)->isPointerTy() ||
1618 !FTy->getParamType(0)->isPointerTy() ||
1619 !FTy->getParamType(1)->isPointerTy()) 1747 !FTy->getParamType(1)->isPointerTy())
1620 return false; 1748 return false;
1621 setDoesNotThrow(F); 1749 setDoesNotThrow(F);
1622 setDoesNotCapture(F, 1); 1750 setDoesNotCapture(F, 1);
1623 setDoesNotCapture(F, 2); 1751 setDoesNotCapture(F, 2);
1624 setOnlyReadsMemory(F, 1); 1752 setOnlyReadsMemory(F, 1);
1625 setOnlyReadsMemory(F, 2); 1753 setOnlyReadsMemory(F, 2);
1626 break; 1754 break;
1627 case LibFunc::fopen64: 1755 case LibFunc::fopen64:
1628 if (FTy->getNumParams() != 2 || 1756 if (FTy->getNumParams() != 2 || !FTy->getReturnType()->isPointerTy() ||
1629 !FTy->getReturnType()->isPointerTy() ||
1630 !FTy->getParamType(0)->isPointerTy() || 1757 !FTy->getParamType(0)->isPointerTy() ||
1631 !FTy->getParamType(1)->isPointerTy()) 1758 !FTy->getParamType(1)->isPointerTy())
1632 return false; 1759 return false;
1633 setDoesNotThrow(F); 1760 setDoesNotThrow(F);
1634 setDoesNotAlias(F, 0); 1761 setDoesNotAlias(F, 0);
1681 } 1808 }
1682 1809
1683 return true; 1810 return true;
1684 } 1811 }
1685 1812
1686 /// annotateLibraryCalls - Adds attributes to well-known standard library 1813 /// Adds attributes to well-known standard library call declarations.
1687 /// call declarations.
1688 bool FunctionAttrs::annotateLibraryCalls(const CallGraphSCC &SCC) { 1814 bool FunctionAttrs::annotateLibraryCalls(const CallGraphSCC &SCC) {
1689 bool MadeChange = false; 1815 bool MadeChange = false;
1690 1816
1691 // Check each function in turn annotating well-known library function 1817 // Check each function in turn annotating well-known library function
1692 // declarations with attributes. 1818 // declarations with attributes.
1693 for (CallGraphSCC::iterator I = SCC.begin(), E = SCC.end(); I != E; ++I) { 1819 for (CallGraphSCC::iterator I = SCC.begin(), E = SCC.end(); I != E; ++I) {
1694 Function *F = (*I)->getFunction(); 1820 Function *F = (*I)->getFunction();
1695 1821
1696 if (F && F->isDeclaration()) 1822 if (F && F->isDeclaration())
1697 MadeChange |= inferPrototypeAttributes(*F); 1823 MadeChange |= inferPrototypeAttributes(*F, *TLI);
1698 } 1824 }
1699 1825
1700 return MadeChange; 1826 return MadeChange;
1701 } 1827 }
1702 1828
1703 bool FunctionAttrs::runOnSCC(CallGraphSCC &SCC) { 1829 bool FunctionAttrs::runOnSCC(CallGraphSCC &SCC) {
1704 AA = &getAnalysis<AliasAnalysis>();
1705 TLI = &getAnalysis<TargetLibraryInfoWrapperPass>().getTLI(); 1830 TLI = &getAnalysis<TargetLibraryInfoWrapperPass>().getTLI();
1706 1831
1707 bool Changed = annotateLibraryCalls(SCC); 1832 bool Changed = annotateLibraryCalls(SCC);
1708 Changed |= AddReadAttrs(SCC); 1833 Changed |= AddReadAttrs(SCC);
1709 Changed |= AddArgumentAttrs(SCC); 1834 Changed |= AddArgumentAttrs(SCC);
1710 Changed |= AddNoAliasAttrs(SCC); 1835 Changed |= AddNoAliasAttrs(SCC);
1836 Changed |= AddNonNullAttrs(SCC);
1711 return Changed; 1837 return Changed;
1712 } 1838 }