BPFFuncTable.cpp File Reference

#include "BPF.h"
#include "llvm/ADT/MapVector.h"
#include "llvm/ADT/SetVector.h"
#include "llvm/IR/Constants.h"
#include "llvm/IR/DiagnosticInfo.h"
#include "llvm/IR/IRBuilder.h"
#include "llvm/IR/InstIterator.h"
#include "llvm/IR/Instructions.h"
#include "llvm/IR/Module.h"
#include "llvm/Pass.h"
#include "llvm/Transforms/Utils/ModuleUtils.h"

Go to the source code of this file.

Macros
#define	DEBUG_TYPE   "bpf-func-table"

Functions
static bool	isInText (const Function &F)
	The address of a function in another section is the address of a program, e.g.
static bool	isCallbackUse (const Use &U, SmallPtrSetImpl< const User * > &Seen)
	A callback: bpf_loop(), bpf_timer_set_callback() and co.
static bool	isAddressUse (const Use &U)
	The use is the address of the function as a value.
static void	replaceAddress (Function &F, Constant *Index)
static bool	runFuncTable (Module &M)
	INITIALIZE_PASS (BPFFuncTableLegacy, DEBUG_TYPE, "BPF Function Table", false, false) ModulePass *llvm

Macro Definition Documentation

DEBUG_TYPE

#define DEBUG_TYPE   "bpf-func-table"

Definition at line 51 of file BPFFuncTable.cpp.

Function Documentation

INITIALIZE_PASS()

INITIALIZE_PASS	(	BPFFuncTableLegacy	,
		DEBUG_TYPE	,
		"BPF Function Table"	,
		false	,
		false	)

Definition at line 219 of file BPFFuncTable.cpp.

References llvm::createBPFFuncTablePass(), and DEBUG_TYPE.

isAddressUse()

bool isAddressUse ( const Use & U )

static

The use is the address of the function as a value.

Definition at line 90 of file BPFFuncTable.cpp.

References llvm::dyn_cast(), llvm::isa(), and isCallbackUse().

Referenced by canFoldIVIncExpr(), replaceAddress(), and runFuncTable().

isCallbackUse()

bool isCallbackUse ( const Use & U, SmallPtrSetImpl< const User * > & Seen )

static

A callback: bpf_loop(), bpf_timer_set_callback() and co.

The kernel calls it and wants the function. A helper is a number, a kfunc a declaration.

Definition at line 71 of file BPFFuncTable.cpp.

References llvm::all_of(), llvm::dyn_cast(), F, llvm::SmallPtrSetImpl< PtrType >::insert(), llvm::isa(), and llvm::Value::uses().

Referenced by isAddressUse().

isInText()

bool isInText ( const Function & F )

static

The address of a function in another section is the address of a program, e.g.

in struct_ops.

Definition at line 65 of file BPFFuncTable.cpp.

References F.

Referenced by runFuncTable().

replaceAddress()

void replaceAddress ( Function & F, Constant * Index )

static

Definition at line 102 of file BPFFuncTable.cpp.

References C(), llvm::dyn_cast(), F, llvm::isa(), isAddressUse(), and llvm::make_early_inc_range().

Referenced by runFuncTable().

runFuncTable()

bool runFuncTable ( Module & M )

static

Definition at line 119 of file BPFFuncTable.cpp.

References llvm::any_of(), llvm::appendToCompilerUsed(), llvm::appendToUsed(), B(), C(), Changed, llvm::collectUsedGlobalVariables(), DL, llvm::dyn_cast(), llvm::SmallVectorTemplateCommon< T, typename >::empty(), F, llvm::First, llvm::ArrayType::get(), llvm::ConstantArray::get(), llvm::ConstantPointerNull::get(), llvm::ConstantExpr::getInBoundsPtrAdd(), llvm::Type::getInt64Ty(), llvm::ConstantExpr::getIntToPtr(), llvm::PointerType::getUnqual(), I, instructions, llvm::GlobalValue::InternalLinkage, llvm::IRBuilder(), llvm::isa(), isAddressUse(), isInText(), llvm::SmallVectorTemplateBase< T, bool >::push_back(), replaceAddress(), llvm::Table, and uint64_t.

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