This class implements a mechanism to disable passes and individual optimizations at compile time based on a command line option (-opt-bisect-limit) in order to perform a bisecting search for optimization-related problems. More...

#include "llvm/IR/OptBisect.h"

Inheritance diagram for llvm::OptBisect:

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Collaboration diagram for llvm::OptBisect:

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Public Member Functions
	OptBisect ()=default
	Default constructor. More...

virtual	~OptBisect ()=default

bool	shouldRunPass (const Pass *P, StringRef IRDescription) override
	Checks the bisect limit to determine if the specified pass should run. More...

bool	isEnabled () const override
	isEnabled() should return true before calling shouldRunPass(). More...

void	setLimit (int Limit)
	Set the new optimization limit and reset the counter. More...

bool	checkPass (const StringRef PassName, const StringRef TargetDesc)
	Checks the bisect limit to determine if the specified pass should run. More...

Public Member Functions inherited from llvm::OptPassGate
virtual	~OptPassGate ()=default

Static Public Attributes
static const int	Disabled = std::numeric_limits<int>::max()

Detailed Description

This class implements a mechanism to disable passes and individual optimizations at compile time based on a command line option (-opt-bisect-limit) in order to perform a bisecting search for optimization-related problems.

Definition at line 44 of file OptBisect.h.

Constructor & Destructor Documentation

◆ OptBisect()

llvm::OptBisect::OptBisect ( )

default

Default constructor.

Initializes the state to "disabled". The bisection will be enabled by the cl::opt call-back when the command line option is processed. Clients should not instantiate this class directly. All access should go through LLVMContext.

◆ ~OptBisect()

virtual llvm::OptBisect::~OptBisect ( )

virtualdefault

Member Function Documentation

◆ checkPass()

bool OptBisect::checkPass	(	const StringRef	PassName,
		const StringRef	TargetDesc
	)

Checks the bisect limit to determine if the specified pass should run.

If the bisect limit is set to -1, the function prints a message describing the pass and the bisect number assigned to it and return true. Otherwise, the function prints a message with the bisect number assigned to the pass and indicating whether or not the pass will be run and return true if the bisect limit has not yet been exceeded or false if it has.

Most passes should not call this routine directly. Instead, they are called through helper routines provided by the pass base classes. For instance, function passes should call FunctionPass::skipFunction().

Definition at line 43 of file OptBisect.cpp.

References assert(), isEnabled(), PassName, and printPassMessage().

Referenced by llvm::OptBisectInstrumentation::registerCallbacks(), and shouldRunPass().

◆ isEnabled()

bool llvm::OptBisect::isEnabled ( ) const

inlineoverridevirtual

isEnabled() should return true before calling shouldRunPass().

Reimplemented from llvm::OptPassGate.

Definition at line 61 of file OptBisect.h.

References Disabled.

Referenced by checkPass(), and shouldRunPass().

◆ setLimit()

void llvm::OptBisect::setLimit ( int Limit )

inline

Set the new optimization limit and reset the counter.

Passing OptBisect::Disabled disables the limiting.

Definition at line 65 of file OptBisect.h.

◆ shouldRunPass()

bool OptBisect::shouldRunPass	(	const Pass *	P,
		StringRef	IRDescription
	)

overridevirtual

Checks the bisect limit to determine if the specified pass should run.

This forwards to checkPass().

Reimplemented from llvm::OptPassGate.

Definition at line 37 of file OptBisect.cpp.

References assert(), checkPass(), isEnabled(), and P.

Member Data Documentation

◆ Disabled

const int OptBisect::Disabled = std::numeric_limits<int>::max()

static

Definition at line 83 of file OptBisect.h.

Referenced by isEnabled().

The documentation for this class was generated from the following files:

include/llvm/IR/OptBisect.h
lib/IR/OptBisect.cpp

Public Member Functions

Static Public Attributes