1 //===- LegacyPassManagers.h - Legacy Pass Infrastructure --------*- C++ -*-===//
3 // The LLVM Compiler Infrastructure
5 // This file is distributed under the University of Illinois Open Source
6 // License. See LICENSE.TXT for details.
8 //===----------------------------------------------------------------------===//
10 // This file declares the LLVM Pass Manager infrastructure.
12 //===----------------------------------------------------------------------===//
14 #ifndef LLVM_IR_LEGACYPASSMANAGERS_H
15 #define LLVM_IR_LEGACYPASSMANAGERS_H
17 #include "llvm/ADT/ArrayRef.h"
18 #include "llvm/ADT/DenseMap.h"
19 #include "llvm/ADT/SmallPtrSet.h"
20 #include "llvm/ADT/SmallVector.h"
21 #include "llvm/Pass.h"
25 //===----------------------------------------------------------------------===//
27 // The Pass Manager Infrastructure manages passes. It's responsibilities are:
29 // o Manage optimization pass execution order
30 // o Make required Analysis information available before pass P is run
31 // o Release memory occupied by dead passes
32 // o If Analysis information is dirtied by a pass then regenerate Analysis
33 // information before it is consumed by another pass.
35 // Pass Manager Infrastructure uses multiple pass managers. They are
36 // PassManager, FunctionPassManager, MPPassManager, FPPassManager, BBPassManager.
37 // This class hierarchy uses multiple inheritance but pass managers do not
38 // derive from another pass manager.
40 // PassManager and FunctionPassManager are two top-level pass manager that
41 // represents the external interface of this entire pass manager infrastucture.
43 // Important classes :
45 // [o] class PMTopLevelManager;
47 // Two top level managers, PassManager and FunctionPassManager, derive from
48 // PMTopLevelManager. PMTopLevelManager manages information used by top level
49 // managers such as last user info.
51 // [o] class PMDataManager;
53 // PMDataManager manages information, e.g. list of available analysis info,
54 // used by a pass manager to manage execution order of passes. It also provides
55 // a place to implement common pass manager APIs. All pass managers derive from
58 // [o] class BBPassManager : public FunctionPass, public PMDataManager;
60 // BBPassManager manages BasicBlockPasses.
62 // [o] class FunctionPassManager;
64 // This is a external interface used to manage FunctionPasses. This
65 // interface relies on FunctionPassManagerImpl to do all the tasks.
67 // [o] class FunctionPassManagerImpl : public ModulePass, PMDataManager,
68 // public PMTopLevelManager;
70 // FunctionPassManagerImpl is a top level manager. It manages FPPassManagers
72 // [o] class FPPassManager : public ModulePass, public PMDataManager;
74 // FPPassManager manages FunctionPasses and BBPassManagers
76 // [o] class MPPassManager : public Pass, public PMDataManager;
78 // MPPassManager manages ModulePasses and FPPassManagers
80 // [o] class PassManager;
82 // This is a external interface used by various tools to manages passes. It
83 // relies on PassManagerImpl to do all the tasks.
85 // [o] class PassManagerImpl : public Pass, public PMDataManager,
86 // public PMTopLevelManager
88 // PassManagerImpl is a top level pass manager responsible for managing
90 //===----------------------------------------------------------------------===//
92 #include "llvm/Support/PrettyStackTrace.h"
102 // enums for debugging strings
103 enum PassDebuggingString {
104 EXECUTION_MSG, // "Executing Pass '" + PassName
105 MODIFICATION_MSG, // "Made Modification '" + PassName
106 FREEING_MSG, // " Freeing Pass '" + PassName
107 ON_BASICBLOCK_MSG, // "' on BasicBlock '" + InstructionName + "'...\n"
108 ON_FUNCTION_MSG, // "' on Function '" + FunctionName + "'...\n"
109 ON_MODULE_MSG, // "' on Module '" + ModuleName + "'...\n"
110 ON_REGION_MSG, // "' on Region '" + Msg + "'...\n'"
111 ON_LOOP_MSG, // "' on Loop '" + Msg + "'...\n'"
112 ON_CG_MSG // "' on Call Graph Nodes '" + Msg + "'...\n'"
115 /// PassManagerPrettyStackEntry - This is used to print informative information
116 /// about what pass is running when/if a stack trace is generated.
117 class PassManagerPrettyStackEntry : public PrettyStackTraceEntry {
123 explicit PassManagerPrettyStackEntry(Pass *p)
124 : P(p), V(nullptr), M(nullptr) {} // When P is releaseMemory'd.
125 PassManagerPrettyStackEntry(Pass *p, Value &v)
126 : P(p), V(&v), M(nullptr) {} // When P is run on V
127 PassManagerPrettyStackEntry(Pass *p, Module &m)
128 : P(p), V(nullptr), M(&m) {} // When P is run on M
130 /// print - Emit information about this stack frame to OS.
131 void print(raw_ostream &OS) const override;
134 //===----------------------------------------------------------------------===//
137 /// PMStack - This class implements a stack data structure of PMDataManager
140 /// Top level pass managers (see PassManager.cpp) maintain active Pass Managers
141 /// using PMStack. Each Pass implements assignPassManager() to connect itself
142 /// with appropriate manager. assignPassManager() walks PMStack to find
143 /// suitable manager.
146 typedef std::vector<PMDataManager *>::const_reverse_iterator iterator;
147 iterator begin() const { return S.rbegin(); }
148 iterator end() const { return S.rend(); }
151 PMDataManager *top() const { return S.back(); }
152 void push(PMDataManager *PM);
153 bool empty() const { return S.empty(); }
158 std::vector<PMDataManager *> S;
161 //===----------------------------------------------------------------------===//
164 /// PMTopLevelManager manages LastUser info and collects common APIs used by
165 /// top level pass managers.
166 class PMTopLevelManager {
168 explicit PMTopLevelManager(PMDataManager *PMDM);
170 unsigned getNumContainedManagers() const {
171 return (unsigned)PassManagers.size();
174 void initializeAllAnalysisInfo();
177 virtual PMDataManager *getAsPMDataManager() = 0;
178 virtual PassManagerType getTopLevelPassManagerType() = 0;
181 /// Schedule pass P for execution. Make sure that passes required by
182 /// P are run before P is run. Update analysis info maintained by
183 /// the manager. Remove dead passes. This is a recursive function.
184 void schedulePass(Pass *P);
186 /// Set pass P as the last user of the given analysis passes.
187 void setLastUser(ArrayRef<Pass*> AnalysisPasses, Pass *P);
189 /// Collect passes whose last user is P
190 void collectLastUses(SmallVectorImpl<Pass *> &LastUses, Pass *P);
192 /// Find the pass that implements Analysis AID. Search immutable
193 /// passes and all pass managers. If desired pass is not found
194 /// then return NULL.
195 Pass *findAnalysisPass(AnalysisID AID);
197 /// Retrieve the PassInfo for an analysis.
198 const PassInfo *findAnalysisPassInfo(AnalysisID AID) const;
200 /// Find analysis usage information for the pass P.
201 AnalysisUsage *findAnalysisUsage(Pass *P);
203 virtual ~PMTopLevelManager();
205 /// Add immutable pass and initialize it.
206 void addImmutablePass(ImmutablePass *P);
208 inline SmallVectorImpl<ImmutablePass *>& getImmutablePasses() {
209 return ImmutablePasses;
212 void addPassManager(PMDataManager *Manager) {
213 PassManagers.push_back(Manager);
216 // Add Manager into the list of managers that are not directly
217 // maintained by this top level pass manager
218 inline void addIndirectPassManager(PMDataManager *Manager) {
219 IndirectPassManagers.push_back(Manager);
222 // Print passes managed by this top level manager.
223 void dumpPasses() const;
224 void dumpArguments() const;
226 // Active Pass Managers
230 /// Collection of pass managers
231 SmallVector<PMDataManager *, 8> PassManagers;
234 /// Collection of pass managers that are not directly maintained
235 /// by this pass manager
236 SmallVector<PMDataManager *, 8> IndirectPassManagers;
238 // Map to keep track of last user of the analysis pass.
239 // LastUser->second is the last user of Lastuser->first.
240 DenseMap<Pass *, Pass *> LastUser;
242 // Map to keep track of passes that are last used by a pass.
243 // This inverse map is initialized at PM->run() based on
245 DenseMap<Pass *, SmallPtrSet<Pass *, 8> > InversedLastUser;
247 /// Immutable passes are managed by top level manager.
248 SmallVector<ImmutablePass *, 16> ImmutablePasses;
250 /// Map from ID to immutable passes.
251 SmallDenseMap<AnalysisID, ImmutablePass *, 8> ImmutablePassMap;
253 DenseMap<Pass *, AnalysisUsage *> AnUsageMap;
255 /// Collection of PassInfo objects found via analysis IDs and in this top
256 /// level manager. This is used to memoize queries to the pass registry.
257 /// FIXME: This is an egregious hack because querying the pass registry is
258 /// either slow or racy.
259 mutable DenseMap<AnalysisID, const PassInfo *> AnalysisPassInfos;
262 //===----------------------------------------------------------------------===//
265 /// PMDataManager provides the common place to manage the analysis data
266 /// used by pass managers.
267 class PMDataManager {
269 explicit PMDataManager() : TPM(nullptr), Depth(0) {
270 initializeAnalysisInfo();
273 virtual ~PMDataManager();
275 virtual Pass *getAsPass() = 0;
277 /// Augment AvailableAnalysis by adding analysis made available by pass P.
278 void recordAvailableAnalysis(Pass *P);
280 /// verifyPreservedAnalysis -- Verify analysis presreved by pass P.
281 void verifyPreservedAnalysis(Pass *P);
283 /// Remove Analysis that is not preserved by the pass
284 void removeNotPreservedAnalysis(Pass *P);
286 /// Remove dead passes used by P.
287 void removeDeadPasses(Pass *P, StringRef Msg,
288 enum PassDebuggingString);
291 void freePass(Pass *P, StringRef Msg,
292 enum PassDebuggingString);
294 /// Add pass P into the PassVector. Update
295 /// AvailableAnalysis appropriately if ProcessAnalysis is true.
296 void add(Pass *P, bool ProcessAnalysis = true);
298 /// Add RequiredPass into list of lower level passes required by pass P.
299 /// RequiredPass is run on the fly by Pass Manager when P requests it
300 /// through getAnalysis interface.
301 virtual void addLowerLevelRequiredPass(Pass *P, Pass *RequiredPass);
303 virtual Pass *getOnTheFlyPass(Pass *P, AnalysisID PI, Function &F);
305 /// Initialize available analysis information.
306 void initializeAnalysisInfo() {
307 AvailableAnalysis.clear();
308 for (unsigned i = 0; i < PMT_Last; ++i)
309 InheritedAnalysis[i] = nullptr;
312 // Return true if P preserves high level analysis used by other
313 // passes that are managed by this manager.
314 bool preserveHigherLevelAnalysis(Pass *P);
316 /// Populate UsedPasses with analysis pass that are used or required by pass
317 /// P and are available. Populate ReqPassNotAvailable with analysis pass that
318 /// are required by pass P but are not available.
319 void collectRequiredAndUsedAnalyses(
320 SmallVectorImpl<Pass *> &UsedPasses,
321 SmallVectorImpl<AnalysisID> &ReqPassNotAvailable, Pass *P);
323 /// All Required analyses should be available to the pass as it runs! Here
324 /// we fill in the AnalysisImpls member of the pass so that it can
325 /// successfully use the getAnalysis() method to retrieve the
326 /// implementations it needs.
327 void initializeAnalysisImpl(Pass *P);
329 /// Find the pass that implements Analysis AID. If desired pass is not found
330 /// then return NULL.
331 Pass *findAnalysisPass(AnalysisID AID, bool Direction);
333 // Access toplevel manager
334 PMTopLevelManager *getTopLevelManager() { return TPM; }
335 void setTopLevelManager(PMTopLevelManager *T) { TPM = T; }
337 unsigned getDepth() const { return Depth; }
338 void setDepth(unsigned newDepth) { Depth = newDepth; }
340 // Print routines used by debug-pass
341 void dumpLastUses(Pass *P, unsigned Offset) const;
342 void dumpPassArguments() const;
343 void dumpPassInfo(Pass *P, enum PassDebuggingString S1,
344 enum PassDebuggingString S2, StringRef Msg);
345 void dumpRequiredSet(const Pass *P) const;
346 void dumpPreservedSet(const Pass *P) const;
347 void dumpUsedSet(const Pass *P) const;
349 unsigned getNumContainedPasses() const {
350 return (unsigned)PassVector.size();
353 virtual PassManagerType getPassManagerType() const {
354 assert ( 0 && "Invalid use of getPassManagerType");
358 DenseMap<AnalysisID, Pass*> *getAvailableAnalysis() {
359 return &AvailableAnalysis;
362 // Collect AvailableAnalysis from all the active Pass Managers.
363 void populateInheritedAnalysis(PMStack &PMS) {
365 for (PMStack::iterator I = PMS.begin(), E = PMS.end();
367 InheritedAnalysis[Index++] = (*I)->getAvailableAnalysis();
371 // Top level manager.
372 PMTopLevelManager *TPM;
374 // Collection of pass that are managed by this manager
375 SmallVector<Pass *, 16> PassVector;
377 // Collection of Analysis provided by Parent pass manager and
378 // used by current pass manager. At at time there can not be more
379 // then PMT_Last active pass mangers.
380 DenseMap<AnalysisID, Pass *> *InheritedAnalysis[PMT_Last];
382 /// isPassDebuggingExecutionsOrMore - Return true if -debug-pass=Executions
383 /// or higher is specified.
384 bool isPassDebuggingExecutionsOrMore() const;
387 void dumpAnalysisUsage(StringRef Msg, const Pass *P,
388 const AnalysisUsage::VectorType &Set) const;
390 // Set of available Analysis. This information is used while scheduling
391 // pass. If a pass requires an analysis which is not available then
392 // the required analysis pass is scheduled to run before the pass itself is
394 DenseMap<AnalysisID, Pass*> AvailableAnalysis;
396 // Collection of higher level analysis used by the pass managed by
398 SmallVector<Pass *, 16> HigherLevelAnalysis;
403 //===----------------------------------------------------------------------===//
406 /// FPPassManager manages BBPassManagers and FunctionPasses.
407 /// It batches all function passes and basic block pass managers together and
408 /// sequence them to process one function at a time before processing next
410 class FPPassManager : public ModulePass, public PMDataManager {
413 explicit FPPassManager()
414 : ModulePass(ID), PMDataManager() { }
416 /// run - Execute all of the passes scheduled for execution. Keep track of
417 /// whether any of the passes modifies the module, and if so, return true.
418 bool runOnFunction(Function &F);
419 bool runOnModule(Module &M) override;
421 /// cleanup - After running all passes, clean up pass manager cache.
424 /// doInitialization - Overrides ModulePass doInitialization for global
425 /// initialization tasks
427 using ModulePass::doInitialization;
429 /// doInitialization - Run all of the initializers for the function passes.
431 bool doInitialization(Module &M) override;
433 /// doFinalization - Overrides ModulePass doFinalization for global
434 /// finalization tasks
436 using ModulePass::doFinalization;
438 /// doFinalization - Run all of the finalizers for the function passes.
440 bool doFinalization(Module &M) override;
442 PMDataManager *getAsPMDataManager() override { return this; }
443 Pass *getAsPass() override { return this; }
445 /// Pass Manager itself does not invalidate any analysis info.
446 void getAnalysisUsage(AnalysisUsage &Info) const override {
447 Info.setPreservesAll();
450 // Print passes managed by this manager
451 void dumpPassStructure(unsigned Offset) override;
453 const char *getPassName() const override {
454 return "Function Pass Manager";
457 FunctionPass *getContainedPass(unsigned N) {
458 assert ( N < PassVector.size() && "Pass number out of range!");
459 FunctionPass *FP = static_cast<FunctionPass *>(PassVector[N]);
463 PassManagerType getPassManagerType() const override {
464 return PMT_FunctionPassManager;
468 Timer *getPassTimer(Pass *);