LLVM 20.0.0git
Pass.cpp
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1//===- Pass.cpp - LLVM Pass Infrastructure Implementation -----------------===//
2//
3// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
4// See https://llvm.org/LICENSE.txt for license information.
5// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
6//
7//===----------------------------------------------------------------------===//
8//
9// This file implements the LLVM Pass infrastructure. It is primarily
10// responsible with ensuring that passes are executed and batched together
11// optimally.
12//
13//===----------------------------------------------------------------------===//
14
15#include "llvm/Pass.h"
16#include "llvm/Config/llvm-config.h"
17#include "llvm/IR/Function.h"
19#include "llvm/IR/LLVMContext.h"
21#include "llvm/IR/Module.h"
22#include "llvm/IR/OptBisect.h"
23#include "llvm/PassInfo.h"
24#include "llvm/PassRegistry.h"
26#include "llvm/Support/Debug.h"
28#include <cassert>
29
30#ifdef EXPENSIVE_CHECKS
32#endif
33
34using namespace llvm;
35
36#define DEBUG_TYPE "ir"
37
38//===----------------------------------------------------------------------===//
39// Pass Implementation
40//
41
42// Force out-of-line virtual method.
44 delete Resolver;
45}
46
47// Force out-of-line virtual method.
48ModulePass::~ModulePass() = default;
49
51 const std::string &Banner) const {
52 return createPrintModulePass(OS, Banner);
53}
54
57}
58
59static std::string getDescription(const Module &M) {
60 return "module (" + M.getName().str() + ")";
61}
62
64 OptPassGate &Gate = M.getContext().getOptPassGate();
65 return Gate.isEnabled() &&
66 !Gate.shouldRunPass(this->getPassName(), getDescription(M));
67}
68
69bool Pass::mustPreserveAnalysisID(char &AID) const {
70 return Resolver->getAnalysisIfAvailable(&AID) != nullptr;
71}
72
73// dumpPassStructure - Implement the -debug-pass=Structure option
75 dbgs().indent(Offset*2) << getPassName() << "\n";
76}
77
78/// getPassName - Return a nice clean name for a pass. This usually
79/// implemented in terms of the name that is registered by one of the
80/// Registration templates, but can be overloaded directly.
82 AnalysisID AID = getPassID();
84 if (PI)
85 return PI->getPassName();
86 return "Unnamed pass: implement Pass::getPassName()";
87}
88
90 // By default, don't do anything.
91}
92
94 // Default implementation.
95 return PMT_Unknown;
96}
97
99 // By default, no analysis results are used, all are invalidated.
100}
101
103 // By default, don't do anything.
104}
105
107 // By default, don't do anything.
108}
109
111 return this;
112}
113
115 return nullptr;
116}
117
119 return nullptr;
120}
121
123 assert(!Resolver && "Resolver is already set");
124 Resolver = AR;
125}
126
127// print - Print out the internal state of the pass. This is called by Analyze
128// to print out the contents of an analysis. Otherwise it is not necessary to
129// implement this method.
130void Pass::print(raw_ostream &OS, const Module *) const {
131 OS << "Pass::print not implemented for pass: '" << getPassName() << "'!\n";
132}
133
134#if !defined(NDEBUG) || defined(LLVM_ENABLE_DUMP)
135// dump - call print(cerr);
137 print(dbgs(), nullptr);
138}
139#endif
140
141#ifdef EXPENSIVE_CHECKS
142uint64_t Pass::structuralHash(Module &M) const {
143 return StructuralHash(M, true);
144}
145
146uint64_t Pass::structuralHash(Function &F) const {
147 return StructuralHash(F, true);
148}
149#endif
150
151//===----------------------------------------------------------------------===//
152// ImmutablePass Implementation
153//
154// Force out-of-line virtual method.
156
158 // By default, don't do anything.
159}
160
161//===----------------------------------------------------------------------===//
162// FunctionPass Implementation
163//
164
166 const std::string &Banner) const {
167 return createPrintFunctionPass(OS, Banner);
168}
169
172}
173
174static std::string getDescription(const Function &F) {
175 return "function (" + F.getName().str() + ")";
176}
177
179 OptPassGate &Gate = F.getContext().getOptPassGate();
180 if (Gate.isEnabled() &&
181 !Gate.shouldRunPass(this->getPassName(), getDescription(F)))
182 return true;
183
184 if (F.hasOptNone()) {
185 LLVM_DEBUG(dbgs() << "Skipping pass '" << getPassName() << "' on function "
186 << F.getName() << "\n");
187 return true;
188 }
189 return false;
190}
191
192const PassInfo *Pass::lookupPassInfo(const void *TI) {
194}
195
198}
199
202 if (!PI)
203 return nullptr;
204 return PI->createPass();
205}
206
207//===----------------------------------------------------------------------===//
208// PassRegistrationListener implementation
209//
210
211// enumeratePasses - Iterate over the registered passes, calling the
212// passEnumerate callback on each PassInfo object.
215}
216
218 : cl::parser<const PassInfo *>(O) {
220}
221
222// This only gets called during static destruction, in which case the
223// PassRegistry will have already been destroyed by llvm_shutdown(). So
224// attempting to remove the registration listener is an error.
226
227//===----------------------------------------------------------------------===//
228// AnalysisUsage Class Implementation
229//
230
231namespace {
232
233struct GetCFGOnlyPasses : public PassRegistrationListener {
235
236 VectorType &CFGOnlyList;
237
238 GetCFGOnlyPasses(VectorType &L) : CFGOnlyList(L) {}
239
240 void passEnumerate(const PassInfo *P) override {
241 if (P->isCFGOnlyPass())
242 CFGOnlyList.push_back(P->getTypeInfo());
243 }
244};
245
246} // end anonymous namespace
247
248// setPreservesCFG - This function should be called to by the pass, iff they do
249// not:
250//
251// 1. Add or remove basic blocks from the function
252// 2. Modify terminator instructions in any way.
253//
254// This function annotates the AnalysisUsage info object to say that analyses
255// that only depend on the CFG are preserved by this pass.
257 // Since this transformation doesn't modify the CFG, it preserves all analyses
258 // that only depend on the CFG (like dominators, loop info, etc...)
259 GetCFGOnlyPasses(Preserved).enumeratePasses();
260}
261
263 const PassInfo *PI = Pass::lookupPassInfo(Arg);
264 // If the pass exists, preserve it. Otherwise silently do nothing.
265 if (PI)
266 pushUnique(Preserved, PI->getTypeInfo());
267 return *this;
268}
269
271 pushUnique(Required, ID);
272 return *this;
273}
274
276 pushUnique(Required, &ID);
277 return *this;
278}
279
281 pushUnique(Required, &ID);
282 pushUnique(RequiredTransitive, &ID);
283 return *this;
284}
aarch64 promote const
static std::string getDescription(const CallGraphSCC &SCC)
#define LLVM_DUMP_METHOD
Mark debug helper function definitions like dump() that should not be stripped from debug builds.
Definition: Compiler.h:537
#define LLVM_DEBUG(X)
Definition: Debug.h:101
This file contains an interface for creating legacy passes to print out IR in various granularities.
#define F(x, y, z)
Definition: MD5.cpp:55
Module.h This file contains the declarations for the Module class.
This file declares the interface for bisecting optimizations.
#define P(N)
assert(ImpDefSCC.getReg()==AMDGPU::SCC &&ImpDefSCC.isDef())
raw_pwrite_stream & OS
AnalysisResolver - Simple interface used by Pass objects to pull all analysis information out of pass...
Represent the analysis usage information of a pass.
AnalysisUsage & addRequiredID(const void *ID)
Definition: Pass.cpp:270
AnalysisUsage & addRequiredTransitiveID(char &ID)
Definition: Pass.cpp:280
SmallVectorImpl< AnalysisID > VectorType
AnalysisUsage & addPreserved()
Add the specified Pass class to the set of analyses preserved by this pass.
void setPreservesCFG()
This function should be called by the pass, iff they do not:
Definition: Pass.cpp:256
PassManagerType getPotentialPassManagerType() const override
Return what kind of Pass Manager can manage this pass.
Definition: Pass.cpp:170
Pass * createPrinterPass(raw_ostream &OS, const std::string &Banner) const override
createPrinterPass - Get a function printer pass.
Definition: Pass.cpp:165
bool skipFunction(const Function &F) const
Optional passes call this function to check whether the pass should be skipped.
Definition: Pass.cpp:178
ImmutablePass class - This class is used to provide information that does not need to be run.
Definition: Pass.h:281
~ImmutablePass() override
virtual void initializePass()
initializePass - This method may be overriden by immutable passes to allow them to perform various in...
Definition: Pass.cpp:157
PassManagerType getPotentialPassManagerType() const override
Return what kind of Pass Manager can manage this pass.
Definition: Pass.cpp:55
~ModulePass() override
bool skipModule(Module &M) const
Optional passes call this function to check whether the pass should be skipped.
Definition: Pass.cpp:63
Pass * createPrinterPass(raw_ostream &OS, const std::string &Banner) const override
createPrinterPass - Get a module printer pass.
Definition: Pass.cpp:50
A Module instance is used to store all the information related to an LLVM module.
Definition: Module.h:65
Extensions to this class implement mechanisms to disable passes and individual optimizations at compi...
Definition: OptBisect.h:24
virtual bool isEnabled() const
isEnabled() should return true before calling shouldRunPass().
Definition: OptBisect.h:36
virtual bool shouldRunPass(const StringRef PassName, StringRef IRDescription)
IRDescription is a textual description of the IR unit the pass is running over.
Definition: OptBisect.h:30
PMDataManager provides the common place to manage the analysis data used by pass managers.
PMStack - This class implements a stack data structure of PMDataManager pointers.
PassInfo class - An instance of this class exists for every pass known by the system,...
Definition: PassInfo.h:30
StringRef getPassName() const
getPassName - Return the friendly name for the pass, never returns null
Definition: PassInfo.h:54
Pass * createPass() const
createPass() - Use this method to create an instance of this pass.
Definition: PassInfo.h:85
const void * getTypeInfo() const
getTypeInfo - Return the id object for the pass... TODO : Rename
Definition: PassInfo.h:63
PassNameParser(cl::Option &O)
Definition: Pass.cpp:217
~PassNameParser() override
static PassRegistry * getPassRegistry()
getPassRegistry - Access the global registry object, which is automatically initialized at applicatio...
void addRegistrationListener(PassRegistrationListener *L)
addRegistrationListener - Register the given PassRegistrationListener to receive passRegistered() cal...
void enumerateWith(PassRegistrationListener *L)
enumerateWith - Enumerate the registered passes, calling the provided PassRegistrationListener's pass...
const PassInfo * getPassInfo(const void *TI) const
getPassInfo - Look up a pass' corresponding PassInfo, indexed by the pass' type identifier (&MyPass::...
Pass interface - Implemented by all 'passes'.
Definition: Pass.h:94
virtual void * getAdjustedAnalysisPointer(AnalysisID ID)
getAdjustedAnalysisPointer - This method is used when a pass implements an analysis interface through...
Definition: Pass.cpp:110
virtual PassManagerType getPotentialPassManagerType() const
Return what kind of Pass Manager can manage this pass.
Definition: Pass.cpp:93
virtual void print(raw_ostream &OS, const Module *M) const
print - Print out the internal state of the pass.
Definition: Pass.cpp:130
bool mustPreserveAnalysisID(char &AID) const
mustPreserveAnalysisID - This method serves the same function as getAnalysisIfAvailable,...
Definition: Pass.cpp:69
void setResolver(AnalysisResolver *AR)
Definition: Pass.cpp:122
static Pass * createPass(AnalysisID ID)
Definition: Pass.cpp:200
virtual PMDataManager * getAsPMDataManager()
Definition: Pass.cpp:118
AnalysisID getPassID() const
getPassID - Return the PassID number that corresponds to this pass.
Definition: Pass.h:113
virtual void getAnalysisUsage(AnalysisUsage &) const
getAnalysisUsage - This function should be overriden by passes that need analysis information to do t...
Definition: Pass.cpp:98
void dump() const
Definition: Pass.cpp:136
virtual void preparePassManager(PMStack &)
Check if available pass managers are suitable for this pass or not.
Definition: Pass.cpp:89
static const PassInfo * lookupPassInfo(const void *TI)
Definition: Pass.cpp:192
virtual ~Pass()
Definition: Pass.cpp:43
virtual void verifyAnalysis() const
verifyAnalysis() - This member can be implemented by a analysis pass to check state of analysis infor...
Definition: Pass.cpp:106
virtual void dumpPassStructure(unsigned Offset=0)
Definition: Pass.cpp:74
virtual StringRef getPassName() const
getPassName - Return a nice clean name for a pass.
Definition: Pass.cpp:81
virtual ImmutablePass * getAsImmutablePass()
Definition: Pass.cpp:114
virtual void releaseMemory()
releaseMemory() - This member can be implemented by a pass if it wants to be able to release its memo...
Definition: Pass.cpp:102
Interface for looking up the initializer for a variable name, used by Init::resolveReferences.
Definition: Record.h:2212
StringRef - Represent a constant reference to a string, i.e.
Definition: StringRef.h:50
Base class of all SIMD vector types.
Definition: DerivedTypes.h:403
This class implements an extremely fast bulk output stream that can only output to a stream.
Definition: raw_ostream.h:52
raw_ostream & indent(unsigned NumSpaces)
indent - Insert 'NumSpaces' spaces.
This is an optimization pass for GlobalISel generic memory operations.
Definition: AddressRanges.h:18
@ Offset
Definition: DWP.cpp:480
PassManagerType
Different types of internal pass managers.
Definition: Pass.h:55
@ PMT_Unknown
Definition: Pass.h:56
@ PMT_ModulePassManager
MPPassManager.
Definition: Pass.h:57
@ PMT_FunctionPassManager
FPPassManager.
Definition: Pass.h:59
IRHash StructuralHash(const Function &F, bool DetailedHash=false)
Returns a hash of the function F.
raw_ostream & dbgs()
dbgs() - This returns a reference to a raw_ostream for debugging messages.
Definition: Debug.cpp:163
const void * AnalysisID
Definition: Pass.h:50
ModulePass * createPrintModulePass(raw_ostream &OS, const std::string &Banner="", bool ShouldPreserveUseListOrder=false)
Create and return a pass that writes the module to the specified raw_ostream.
FunctionPass * createPrintFunctionPass(raw_ostream &OS, const std::string &Banner="")
Create and return a pass that prints functions to the specified raw_ostream as they are processed.
PassRegistrationListener class - This class is meant to be derived from by clients that are intereste...
Definition: PassSupport.h:124
void enumeratePasses()
enumeratePasses - Iterate over the registered passes, calling the passEnumerate callback on each Pass...
Definition: Pass.cpp:213