LLVM  14.0.0git
Macros | Functions | Variables
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/EHPersonalities.h"
#include "llvm/Analysis/MemoryLocation.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/InitializePasses.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 CallInstfindStackProtectorIntrinsic (Function &F)
 Search for the first call to the llvm.stackprotector intrinsic and return it if present. More...
 
static ValuegetStackGuard (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 55 of file StackProtector.cpp.

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 @llvm.stackprotector(StackGuard, StackGuardSlot)

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

Definition at line 412 of file StackProtector.cpp.

References B, F, llvm::Value::getContext(), llvm::Intrinsic::getDeclaration(), llvm::Type::getInt8PtrTy(), getStackGuard(), and M.

◆ 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 251 of file StackProtector.cpp.

References BB, F, and I.

◆ 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 377 of file StackProtector.cpp.

References B, llvm::StringRef::empty(), llvm::Intrinsic::getDeclaration(), llvm::TargetLoweringBase::getIRStackGuard(), llvm::TargetLoweringBase::insertSSPDeclarations(), and M.

Referenced by CreatePrologue().

◆ INITIALIZE_PASS_BEGIN()

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

◆ STATISTIC() [1/2]

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

◆ STATISTIC() [2/2]

STATISTIC ( NumFunProtected  ,
"Number of functions protected"   
)

Variable Documentation

◆ DEBUG_TYPE

DEBUG_TYPE

Definition at line 74 of file StackProtector.cpp.

◆ EnableSelectionDAGSP

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

◆ false

Insert stack false

Definition at line 75 of file StackProtector.cpp.

◆ protectors

Insert stack protectors

Definition at line 75 of file StackProtector.cpp.