DeadArgumentElimination.cpp File Reference

#include "llvm/Transforms/IPO/DeadArgumentElimination.h"
#include "llvm/ADT/SmallVector.h"
#include "llvm/ADT/Statistic.h"
#include "llvm/Analysis/OptimizationRemarkEmitter.h"
#include "llvm/IR/Argument.h"
#include "llvm/IR/AttributeMask.h"
#include "llvm/IR/Attributes.h"
#include "llvm/IR/BasicBlock.h"
#include "llvm/IR/Constants.h"
#include "llvm/IR/DIBuilder.h"
#include "llvm/IR/DerivedTypes.h"
#include "llvm/IR/Function.h"
#include "llvm/IR/IRBuilder.h"
#include "llvm/IR/InstrTypes.h"
#include "llvm/IR/Instructions.h"
#include "llvm/IR/IntrinsicInst.h"
#include "llvm/IR/Intrinsics.h"
#include "llvm/IR/Module.h"
#include "llvm/IR/NoFolder.h"
#include "llvm/IR/PassManager.h"
#include "llvm/IR/Type.h"
#include "llvm/IR/Use.h"
#include "llvm/IR/User.h"
#include "llvm/IR/Value.h"
#include "llvm/InitializePasses.h"
#include "llvm/Pass.h"
#include "llvm/Support/Casting.h"
#include "llvm/Support/Debug.h"
#include "llvm/Support/raw_ostream.h"
#include "llvm/Transforms/IPO.h"
#include "llvm/Transforms/Utils/BasicBlockUtils.h"
#include <cassert>
#include <utility>
#include <vector>

Go to the source code of this file.

Macros
#define	DEBUG_TYPE   "deadargelim"

Functions
	STATISTIC (NumArgumentsEliminated, "Number of unread args removed")
	STATISTIC (NumRetValsEliminated, "Number of unused return values removed")
	STATISTIC (NumArgumentsReplacedWithPoison, "Number of unread args replaced with poison")
	INITIALIZE_PASS (DAH, "deadarghaX0r", "Dead Argument Hacking (BUGPOINT USE ONLY; DO NOT USE)", false, false) ModulePass *llvm
	This pass removes arguments from functions which are not used by the body of the function.
static unsigned	numRetVals (const Function *F)
	Convenience function that returns the number of return values.
static Type *	getRetComponentType (const Function *F, unsigned Idx)
	Returns the sub-type a function will return at a given Idx.

Macro Definition Documentation

DEBUG_TYPE

#define DEBUG_TYPE   "deadargelim"

Definition at line 56 of file DeadArgumentElimination.cpp.

Function Documentation

getRetComponentType()

Type * getRetComponentType ( const Function * F, unsigned Idx )

static

Returns the sub-type a function will return at a given Idx.

Should correspond to the result type of an ExtractValue instruction executed with just that one Idx (i.e. only top-level structure is considered).

Definition at line 347 of file DeadArgumentElimination.cpp.

References assert(), llvm::dyn_cast(), F, and llvm::Type::isVoidTy().

INITIALIZE_PASS()

INITIALIZE_PASS	(	DAH	,
		"deadarghaX0r"	,
		"Dead Argument Hacking (BUGPOINT USE ONLY; DO NOT USE)"	,
		false	,
		false	)

This pass removes arguments from functions which are not used by the body of the function.

Definition at line 112 of file DeadArgumentElimination.cpp.

References llvm::createDeadArgEliminationPass().

numRetVals()

unsigned numRetVals ( const Function * F )

static

Convenience function that returns the number of return values.

It returns 0 for void functions and 1 for functions not returning a struct. It returns the number of struct elements for functions returning a struct.

Definition at line 333 of file DeadArgumentElimination.cpp.

References llvm::dyn_cast(), F, and llvm::Type::isVoidTy().

STATISTIC() [1/3]

STATISTIC	(	NumArgumentsEliminated	,
		"Number of unread args removed"	)

STATISTIC() [2/3]

STATISTIC	(	NumArgumentsReplacedWithPoison	,
		"Number of unread args replaced with poison"	)

STATISTIC() [3/3]

STATISTIC	(	NumRetValsEliminated	,
		"Number of unused return values removed"	)