This is an alternative analysis pass to BlockFrequencyInfoWrapperPass. More...
#include "llvm/Analysis/LazyBlockFrequencyInfo.h"
Public Member Functions | |
| LazyBlockFrequencyInfoPass () | |
| BlockFrequencyInfo & | getBFI () |
| Compute and return the block frequencies. More... | |
| const BlockFrequencyInfo & | getBFI () const |
| Compute and return the block frequencies. More... | |
| void | getAnalysisUsage (AnalysisUsage &AU) const override |
| getAnalysisUsage - This function should be overriden by passes that need analysis information to do their job. More... | |
| bool | runOnFunction (Function &F) override |
| runOnFunction - Virtual method overriden by subclasses to do the per-function processing of the pass. More... | |
| void | releaseMemory () override |
| releaseMemory() - This member can be implemented by a pass if it wants to be able to release its memory when it is no longer needed. More... | |
| void | print (raw_ostream &OS, const Module *M) const override |
| print - Print out the internal state of the pass. More... | |
 Public Member Functions inherited from llvm::FunctionPass | |
| FunctionPass (char &pid) | |
| Pass * | createPrinterPass (raw_ostream &OS, const std::string &Banner) const override |
| createPrinterPass - Get a function printer pass. More... | |
| void | assignPassManager (PMStack &PMS, PassManagerType T) override |
| Find appropriate Function Pass Manager or Call Graph Pass Manager in the PM Stack and add self into that manager. More... | |
| PassManagerType | getPotentialPassManagerType () const override |
| Return what kind of Pass Manager can manage this pass. More... | |
| Public Member Functions inherited from llvm::Pass | |
| Pass (PassKind K, char &pid) | |
| Pass (const Pass &)=delete | |
| Pass & | operator= (const Pass &)=delete |
| virtual | ~Pass () |
| PassKind | getPassKind () const |
| virtual StringRef | getPassName () const |
| getPassName - Return a nice clean name for a pass. More... | |
| AnalysisID | getPassID () const |
| getPassID - Return the PassID number that corresponds to this pass. More... | |
| virtual bool | doInitialization (Module &) |
| doInitialization - Virtual method overridden by subclasses to do any necessary initialization before any pass is run. More... | |
| virtual bool | doFinalization (Module &) |
| doFinalization - Virtual method overriden by subclasses to do any necessary clean up after all passes have run. More... | |
| void | dump () const |
| virtual void | preparePassManager (PMStack &) |
| Check if available pass managers are suitable for this pass or not. More... | |
| void | setResolver (AnalysisResolver *AR) |
| AnalysisResolver * | getResolver () const |
| virtual void * | getAdjustedAnalysisPointer (AnalysisID ID) |
| getAdjustedAnalysisPointer - This method is used when a pass implements an analysis interface through multiple inheritance. More... | |
| virtual ImmutablePass * | getAsImmutablePass () |
| virtual PMDataManager * | getAsPMDataManager () |
| virtual void | verifyAnalysis () const |
| verifyAnalysis() - This member can be implemented by a analysis pass to check state of analysis information. More... | |
| virtual void | dumpPassStructure (unsigned Offset=0) |
| template<typename AnalysisType > | |
| AnalysisType * | getAnalysisIfAvailable () const |
| getAnalysisIfAvailable<AnalysisType>() - Subclasses use this function to get analysis information that might be around, for example to update it. More... | |
| bool | mustPreserveAnalysisID (char &AID) const |
| mustPreserveAnalysisID - This method serves the same function as getAnalysisIfAvailable, but works if you just have an AnalysisID. More... | |
| template<typename AnalysisType > | |
| AnalysisType & | getAnalysis () const |
| getAnalysis<AnalysisType>() - This function is used by subclasses to get to the analysis information that they claim to use by overriding the getAnalysisUsage function. More... | |
| template<typename AnalysisType > | |
| AnalysisType & | getAnalysis (Function &F) |
| getAnalysis<AnalysisType>() - This function is used by subclasses to get to the analysis information that they claim to use by overriding the getAnalysisUsage function. More... | |
| template<typename AnalysisType > | |
| AnalysisType & | getAnalysisID (AnalysisID PI) const |
| template<typename AnalysisType > | |
| AnalysisType & | getAnalysisID (AnalysisID PI, Function &F) |
Static Public Member Functions | |
| static void | getLazyBFIAnalysisUsage (AnalysisUsage &AU) |
| Helper for client passes to set up the analysis usage on behalf of this pass. More... | |
| Static Public Member Functions inherited from llvm::Pass | |
| static const PassInfo * | lookupPassInfo (const void *TI) |
| static const PassInfo * | lookupPassInfo (StringRef Arg) |
| static Pass * | createPass (AnalysisID ID) |
Static Public Attributes | |
| static char | ID = 0 |
Additional Inherited Members | |
| Protected Member Functions inherited from llvm::FunctionPass | |
| bool | skipFunction (const Function &F) const |
| Optional passes call this function to check whether the pass should be skipped. More... | |
Detailed Description
This is an alternative analysis pass to BlockFrequencyInfoWrapperPass.
The difference is that with this pass the block frequencies are not computed when the analysis pass is executed but rather when the BFI result is explicitly requested by the analysis client.
There are some additional requirements for any client pass that wants to use the analysis:
The pass needs to initialize dependent passes with:
Similarly, getAnalysisUsage should call:
LazyBlockFrequencyInfoPass::getLazyBFIAnalysisUsage(AU)
- The computed BFI should be requested with getAnalysis<LazyBlockFrequencyInfoPass>().getBFI() before either LoopInfo or BPI could be invalidated for example by changing the CFG.
Note that it is expected that we wouldn't need this functionality for the new PM since with the new PM, analyses are executed on demand.
Definition at line 101 of file LazyBlockFrequencyInfo.h.
Constructor & Destructor Documentation
◆ LazyBlockFrequencyInfoPass()
| LazyBlockFrequencyInfoPass::LazyBlockFrequencyInfoPass | ( | ) |
Definition at line 35 of file LazyBlockFrequencyInfo.cpp.
References llvm::PassRegistry::getPassRegistry(), and llvm::initializeLazyBlockFrequencyInfoPassPass().
Member Function Documentation
◆ getAnalysisUsage()
|
overridevirtual |
getAnalysisUsage - This function should be overriden by passes that need analysis information to do their job.
If a pass specifies that it uses a particular analysis result to this function, it can then use the getAnalysis<AnalysisType>() function, below.
Reimplemented from llvm::Pass.
Definition at line 43 of file LazyBlockFrequencyInfo.cpp.
References llvm::AnalysisUsage::addRequired(), llvm::LazyBranchProbabilityInfoPass::getLazyBPIAnalysisUsage(), and llvm::AnalysisUsage::setPreservesAll().
◆ getBFI() [1/2]
|
inline |
Compute and return the block frequencies.
Definition at line 113 of file LazyBlockFrequencyInfo.h.
◆ getBFI() [2/2]
|
inline |
Compute and return the block frequencies.
Definition at line 116 of file LazyBlockFrequencyInfo.h.
References F, llvm::initializeLazyBFIPassPass(), print(), llvm::LazyBlockFrequencyInfo< FunctionT, BranchProbabilityInfoPassT, LoopInfoT, BlockFrequencyInfoT >::releaseMemory(), and runOnFunction().
◆ getLazyBFIAnalysisUsage()
|
static |
Helper for client passes to set up the analysis usage on behalf of this pass.
Definition at line 62 of file LazyBlockFrequencyInfo.cpp.
References llvm::AnalysisUsage::addRequired(), and llvm::LazyBranchProbabilityInfoPass::getLazyBPIAnalysisUsage().
Referenced by llvm::OptimizationRemarkEmitterWrapperPass::getAnalysisUsage().
◆ print()
|
overridevirtual |
print - Print out the internal state of the pass.
This is called by Analyze to print out the contents of an analysis. Otherwise it is not necessary to implement this method. Beware that the module pointer MAY be null. This automatically forwards to a virtual function that does not provide the Module* in case the analysis doesn't need it it can just be ignored.
Reimplemented from llvm::Pass.
Definition at line 39 of file LazyBlockFrequencyInfo.cpp.
◆ releaseMemory()
|
overridevirtual |
releaseMemory() - This member can be implemented by a pass if it wants to be able to release its memory when it is no longer needed.
The default behavior of passes is to hold onto memory for the entire duration of their lifetime (which is the entire compile time). For pipelined passes, this is not a big deal because that memory gets recycled every time the pass is invoked on another program unit. For IP passes, it is more important to free memory when it is unused.
Optionally implement this function to release pass memory when it is no longer used.
Reimplemented from llvm::Pass.
Definition at line 53 of file LazyBlockFrequencyInfo.cpp.
◆ runOnFunction()
runOnFunction - Virtual method overriden by subclasses to do the per-function processing of the pass.
Implements llvm::FunctionPass.
Definition at line 55 of file LazyBlockFrequencyInfo.cpp.
Member Data Documentation
◆ ID
Definition at line 108 of file LazyBlockFrequencyInfo.h.
The documentation for this class was generated from the following files:
- include/llvm/Analysis/LazyBlockFrequencyInfo.h
- lib/Analysis/LazyBlockFrequencyInfo.cpp
