ElimAvailExtern.cpp File Reference

#include "llvm/Transforms/IPO/ElimAvailExtern.h"
#include "llvm/ADT/STLExtras.h"
#include "llvm/ADT/Statistic.h"
#include "llvm/Analysis/CtxProfAnalysis.h"
#include "llvm/IR/Constant.h"
#include "llvm/IR/DebugInfoMetadata.h"
#include "llvm/IR/Function.h"
#include "llvm/IR/GlobalValue.h"
#include "llvm/IR/GlobalVariable.h"
#include "llvm/IR/MDBuilder.h"
#include "llvm/IR/Module.h"
#include "llvm/Support/CommandLine.h"
#include "llvm/Transforms/Utils/GlobalStatus.h"
#include "llvm/Transforms/Utils/ModuleUtils.h"

Go to the source code of this file.

Macros
#define	DEBUG_TYPE   "elim-avail-extern"

Functions
	STATISTIC (NumRemovals, "Number of functions removed")
	STATISTIC (NumFunctionsConverted, "Number of functions converted")
	STATISTIC (NumGlobalVariablesConverted, "Number of global variables converted")
	STATISTIC (NumVariables, "Number of global variables removed")
void	deleteFunction (Function &F)
static std::string	getNewName (Module &M, const GlobalValue &GV)
static void	convertToLocalCopy (Module &M, Function &F)
	Create a copy of the thinlto import, mark it local, and redirect direct calls to the copy.
static void	convertToLocalCopy (Module &M, GlobalVariable &GV)
	Similar to the function above, this is to convert an externally available global variable to local.
static bool	eliminateAvailableExternally (Module &M, bool Convert)

Variables
static cl::opt< bool >	ConvertToLocal ("avail-extern-to-local", cl::Hidden, cl::desc("Convert available_externally into locals, renaming them " "to avoid link-time clashes."))
static cl::opt< unsigned >	ConvertGlobalVariableInAddrSpace ("avail-extern-gv-in-addrspace-to-local", cl::Hidden, cl::desc("Convert available_externally global variables into locals if they are " "in specificed addrspace, renaming them to avoid link-time clashes."))

Macro Definition Documentation

DEBUG_TYPE

#define DEBUG_TYPE   "elim-avail-extern"

Definition at line 31 of file ElimAvailExtern.cpp.

Function Documentation

convertToLocalCopy() [1/2]

void convertToLocalCopy ( Module & M, Function & F )

static

Create a copy of the thinlto import, mark it local, and redirect direct calls to the copy.

Only direct calls are replaced, so that e.g. indirect call function pointer tests would use the global identity of the function.

Currently, Value Profiling ("VP") MD_prof data isn't updated to refer to the clone's GUID (which will be different, because the name and linkage is different), under the assumption that the last consumer of this data is upstream the pipeline (e.g. ICP).

Definition at line 71 of file ElimAvailExtern.cpp.

References assert(), llvm::Function::Create(), deleteFunction(), llvm::GlobalValue::ExternalLinkage, F, llvm::find_if(), llvm::MDString::get(), getNewName(), llvm::GlobalValue::InternalLinkage, and llvm::isa().

Referenced by eliminateAvailableExternally().

convertToLocalCopy() [2/2]

void convertToLocalCopy ( Module & M, GlobalVariable & GV )

static

Similar to the function above, this is to convert an externally available global variable to local.

Definition at line 108 of file ElimAvailExtern.cpp.

References assert(), getNewName(), llvm::GlobalValue::hasAvailableExternallyLinkage(), llvm::GlobalValue::InternalLinkage, llvm::GlobalValue::setLinkage(), and llvm::Value::setName().

deleteFunction()

void deleteFunction

(

Function &

F

)

Definition at line 53 of file ElimAvailExtern.cpp.

References F.

Referenced by convertToLocalCopy(), and eliminateAvailableExternally().

eliminateAvailableExternally()

bool eliminateAvailableExternally ( Module & M, bool Convert )

static

Definition at line 115 of file ElimAvailExtern.cpp.

References Changed, ConvertGlobalVariableInAddrSpace, ConvertToLocal, convertToLocalCopy(), deleteFunction(), llvm::GlobalValue::ExternalLinkage, F, llvm::isSafeToDestroyConstant(), and llvm::make_early_inc_range().

Referenced by llvm::EliminateAvailableExternallyPass::run().

getNewName()

std::string getNewName ( Module & M, const GlobalValue & GV )

static

Definition at line 59 of file ElimAvailExtern.cpp.

References llvm::Value::getName(), llvm::getUniqueModuleId(), and llvm::StringRef::str().

Referenced by convertToLocalCopy(), and convertToLocalCopy().

STATISTIC() [1/4]

STATISTIC	(	NumFunctionsConverted	,
		"Number of functions converted"	)

STATISTIC() [2/4]

STATISTIC	(	NumGlobalVariablesConverted	,
		"Number of global variables converted"	)

STATISTIC() [3/4]

STATISTIC	(	NumRemovals	,
		"Number of functions removed"	)

STATISTIC() [4/4]

STATISTIC	(	NumVariables	,
		"Number of global variables removed"	)

Variable Documentation

ConvertGlobalVariableInAddrSpace

cl::opt< unsigned > ConvertGlobalVariableInAddrSpace("avail-extern-gv-in-addrspace-to-local", cl::Hidden, cl::desc( "Convert available_externally global variables into locals if they are " "in specificed addrspace, renaming them to avoid link-time clashes.")) ( "avail-extern-gv-in-addrspace-to-local" , cl::Hidden , cl::desc( "Convert available_externally global variables into locals if they are " "in specificed addrspace, renaming them to avoid link-time clashes.")  )

static

Referenced by eliminateAvailableExternally().

ConvertToLocal

cl::opt< bool > ConvertToLocal("avail-extern-to-local", cl::Hidden, cl::desc("Convert available_externally into locals, renaming them " "to avoid link-time clashes.")) ( "avail-extern-to-local" , cl::Hidden , cl::desc("Convert available_externally into locals, renaming them " "to avoid link-time clashes.")  )

static

Referenced by eliminateAvailableExternally().