StackProtector.cpp File Reference

#include "llvm/CodeGen/StackProtector.h"
#include "llvm/ADT/SmallPtrSet.h"
#include "llvm/ADT/Statistic.h"
#include "llvm/Analysis/BranchProbabilityInfo.h"
#include "llvm/Analysis/CaptureTracking.h"
#include "llvm/Analysis/EHPersonalities.h"
#include "llvm/Analysis/OptimizationRemarkEmitter.h"
#include "llvm/CodeGen/Passes.h"
#include "llvm/CodeGen/TargetLowering.h"
#include "llvm/CodeGen/TargetPassConfig.h"
#include "llvm/CodeGen/TargetSubtargetInfo.h"
#include "llvm/IR/Attributes.h"
#include "llvm/IR/BasicBlock.h"
#include "llvm/IR/Constants.h"
#include "llvm/IR/DataLayout.h"
#include "llvm/IR/DebugInfo.h"
#include "llvm/IR/DebugLoc.h"
#include "llvm/IR/DerivedTypes.h"
#include "llvm/IR/Dominators.h"
#include "llvm/IR/Function.h"
#include "llvm/IR/IRBuilder.h"
#include "llvm/IR/Instruction.h"
#include "llvm/IR/Instructions.h"
#include "llvm/IR/IntrinsicInst.h"
#include "llvm/IR/Intrinsics.h"
#include "llvm/IR/MDBuilder.h"
#include "llvm/IR/Module.h"
#include "llvm/IR/Type.h"
#include "llvm/IR/User.h"
#include "llvm/Pass.h"
#include "llvm/Support/Casting.h"
#include "llvm/Support/CommandLine.h"
#include "llvm/Target/TargetMachine.h"
#include "llvm/Target/TargetOptions.h"
#include <utility>

Include dependency graph for StackProtector.cpp:

Go to the source code of this file.

Macros
#define	DEBUG_TYPE   "stack-protector"

Functions
	STATISTIC (NumFunProtected, "Number of functions protected")
	STATISTIC (NumAddrTaken, "Number of local variables that have their address" " taken.")
	INITIALIZE_PASS_BEGIN (StackProtector, DEBUG_TYPE, "Insert stack protectors", false, true) INITIALIZE_PASS_END(StackProtector
static const CallInst *	findStackProtectorIntrinsic (Function &F)
	Search for the first call to the llvm.stackprotector intrinsic and return it if present. More...
static Value *	getStackGuard (const TargetLoweringBase *TLI, Module *M, IRBuilder<> &B, bool *SupportsSelectionDAGSP=nullptr)
	Create a stack guard loading and populate whether SelectionDAG SSP is supported. More...
static bool	CreatePrologue (Function *F, Module *M, ReturnInst *RI, const TargetLoweringBase *TLI, AllocaInst *&AI)
	Insert code into the entry block that stores the stack guard variable onto the stack: More...

Variables
static cl::opt< bool >	EnableSelectionDAGSP ("enable-selectiondag-sp", cl::init(true), cl::Hidden)
	DEBUG_TYPE
Insert stack	protectors
Insert stack	false

Macro Definition Documentation

DEBUG_TYPE

#define DEBUG_TYPE   "stack-protector"

Definition at line 54 of file StackProtector.cpp.

Referenced by findStackProtectorIntrinsic().

Function Documentation

CreatePrologue()

static bool CreatePrologue ( Function *  F, Module *  M, ReturnInst *  RI, const TargetLoweringBase *  TLI, AllocaInst *&  AI  )

static

Insert code into the entry block that stores the stack guard variable onto the stack:

entry: StackGuardSlot = alloca i8* StackGuard = <stack guard>=""> call void .stackprotector(StackGuard, StackGuardSlot)

Returns true if the platform/triple supports the stackprotectorcreate pseudo node.

Definition at line 323 of file StackProtector.cpp.

References llvm::DominatorTreeBase< NodeT, IsPostDom >::addNewBlock(), assert(), B, llvm::Function::begin(), Context, llvm::BasicBlock::Create(), llvm::IRBuilder< T, Inserter >::CreateCall(), llvm::IRBuilder< T, Inserter >::CreateCondBr(), llvm::IRBuilder< T, Inserter >::CreateGlobalStringPtr(), llvm::IRBuilder< T, Inserter >::CreateICmpEQ(), llvm::IRBuilder< T, Inserter >::CreateLoad(), llvm::IRBuilder< T, Inserter >::CreateUnreachable(), llvm::dyn_cast(), E, llvm::TargetOptions::EnableFastISel, llvm::TargetOptions::EnableGlobalISel, EnableSelectionDAGSP, llvm::Function::end(), llvm::Instruction::eraseFromParent(), findStackProtectorIntrinsic(), llvm::BasicBlock::front(), llvm::DebugLoc::get(), llvm::CallBase::getArgOperand(), llvm::BranchProbabilityInfo::getBranchProbStackProtector(), llvm::Function::getContext(), llvm::Value::getContext(), llvm::Intrinsic::getDeclaration(), llvm::Function::getEntryBlock(), llvm::IRBuilderBase::getInt8PtrTy(), llvm::Type::getInt8PtrTy(), llvm::ilist_node_impl< OptionsT >::getIterator(), llvm::Value::getName(), llvm::Module::getOrInsertFunction(), llvm::TargetLoweringBase::getSSPStackGuardCheck(), getStackGuard(), llvm::Function::getSubprogram(), llvm::BasicBlock::getTerminator(), llvm::Type::getVoidTy(), I, llvm::Triple::isOSOpenBSD(), llvm::DominatorTree::isReachableFromEntry(), llvm::BasicBlock::moveAfter(), llvm::TargetMachine::Options, llvm::CallBase::setAttributes(), llvm::CallBase::setCallingConv(), llvm::IRBuilderBase::SetCurrentDebugLocation(), llvm::BasicBlock::splitBasicBlock(), and llvm::TargetLoweringBase::useStackGuardXorFP().

findStackProtectorIntrinsic()

static const CallInst* findStackProtectorIntrinsic ( Function &  F )

static

Search for the first call to the llvm.stackprotector intrinsic and return it if present.

Definition at line 162 of file StackProtector.cpp.

References DEBUG_TYPE, llvm::OptimizationRemarkEmitter::emit(), llvm::Intrinsic::getDeclaration(), llvm::Function::hasFnAttribute(), I, llvm::DenseMapBase< DerivedT, KeyT, ValueT, KeyInfoT, BucketT >::insert(), llvm::PointerMayBeCaptured(), llvm::MachineFrameInfo::SSPLK_AddrOf, llvm::MachineFrameInfo::SSPLK_LargeArray, and llvm::MachineFrameInfo::SSPLK_SmallArray.

Referenced by CreatePrologue().

getStackGuard()

static Value* getStackGuard ( const TargetLoweringBase *  TLI, Module *  M, IRBuilder<> &  B, bool *  SupportsSelectionDAGSP = nullptr  )

static

Create a stack guard loading and populate whether SelectionDAG SSP is supported.

Definition at line 290 of file StackProtector.cpp.

References llvm::IRBuilder< T, Inserter >::CreateCall(), llvm::IRBuilder< T, Inserter >::CreateLoad(), llvm::Intrinsic::getDeclaration(), llvm::IRBuilderBase::getInt8PtrTy(), llvm::TargetLoweringBase::getIRStackGuard(), and llvm::TargetLoweringBase::insertSSPDeclarations().

Referenced by CreatePrologue().

INITIALIZE_PASS_BEGIN()

INITIALIZE_PASS_BEGIN	(	StackProtector	,
		DEBUG_TYPE	,
		"Insert stack protectors"	,
		false	,
		true
	)

STATISTIC() [1/2]

STATISTIC	(	NumFunProtected	,
		"Number of functions protected"
	)

STATISTIC() [2/2]

STATISTIC	(	NumAddrTaken	,
		"Number of local variables that have their address" " taken."
	)

Variable Documentation

DEBUG_TYPE

DEBUG_TYPE

Definition at line 68 of file StackProtector.cpp.

EnableSelectionDAGSP

cl::opt<bool> EnableSelectionDAGSP("enable-selectiondag-sp", cl::init(true), cl::Hidden)

static

Referenced by CreatePrologue().

false

Insert stack false

Definition at line 68 of file StackProtector.cpp.

protectors

Insert stack protectors

Definition at line 68 of file StackProtector.cpp.