Import prebuilt clang toolchain for linux.
diff --git a/linux-x64/clang/include/llvm/CodeGen/StackProtector.h b/linux-x64/clang/include/llvm/CodeGen/StackProtector.h
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+//===- StackProtector.h - Stack Protector Insertion -------------*- C++ -*-===//
+//
+// The LLVM Compiler Infrastructure
+//
+// This file is distributed under the University of Illinois Open Source
+// License. See LICENSE.TXT for details.
+//
+//===----------------------------------------------------------------------===//
+//
+// This pass inserts stack protectors into functions which need them. A variable
+// with a random value in it is stored onto the stack before the local variables
+// are allocated. Upon exiting the block, the stored value is checked. If it's
+// changed, then there was some sort of violation and the program aborts.
+//
+//===----------------------------------------------------------------------===//
+
+#ifndef LLVM_CODEGEN_STACKPROTECTOR_H
+#define LLVM_CODEGEN_STACKPROTECTOR_H
+
+#include "llvm/ADT/SmallPtrSet.h"
+#include "llvm/ADT/Triple.h"
+#include "llvm/IR/Instructions.h"
+#include "llvm/IR/ValueMap.h"
+#include "llvm/Pass.h"
+
+namespace llvm {
+
+class BasicBlock;
+class DominatorTree;
+class Function;
+class Instruction;
+class Module;
+class TargetLoweringBase;
+class TargetMachine;
+class Type;
+
+class StackProtector : public FunctionPass {
+public:
+ /// SSPLayoutKind. Stack Smashing Protection (SSP) rules require that
+ /// vulnerable stack allocations are located close the stack protector.
+ enum SSPLayoutKind {
+ SSPLK_None, ///< Did not trigger a stack protector. No effect on data
+ ///< layout.
+ SSPLK_LargeArray, ///< Array or nested array >= SSP-buffer-size. Closest
+ ///< to the stack protector.
+ SSPLK_SmallArray, ///< Array or nested array < SSP-buffer-size. 2nd closest
+ ///< to the stack protector.
+ SSPLK_AddrOf ///< The address of this allocation is exposed and
+ ///< triggered protection. 3rd closest to the protector.
+ };
+
+ /// A mapping of AllocaInsts to their required SSP layout.
+ using SSPLayoutMap = ValueMap<const AllocaInst *, SSPLayoutKind>;
+
+private:
+ const TargetMachine *TM = nullptr;
+
+ /// TLI - Keep a pointer of a TargetLowering to consult for determining
+ /// target type sizes.
+ const TargetLoweringBase *TLI = nullptr;
+ Triple Trip;
+
+ Function *F;
+ Module *M;
+
+ DominatorTree *DT;
+
+ /// Layout - Mapping of allocations to the required SSPLayoutKind.
+ /// StackProtector analysis will update this map when determining if an
+ /// AllocaInst triggers a stack protector.
+ SSPLayoutMap Layout;
+
+ /// \brief The minimum size of buffers that will receive stack smashing
+ /// protection when -fstack-protection is used.
+ unsigned SSPBufferSize = 0;
+
+ /// VisitedPHIs - The set of PHI nodes visited when determining
+ /// if a variable's reference has been taken. This set
+ /// is maintained to ensure we don't visit the same PHI node multiple
+ /// times.
+ SmallPtrSet<const PHINode *, 16> VisitedPHIs;
+
+ // A prologue is generated.
+ bool HasPrologue = false;
+
+ // IR checking code is generated.
+ bool HasIRCheck = false;
+
+ /// InsertStackProtectors - Insert code into the prologue and epilogue of
+ /// the function.
+ ///
+ /// - The prologue code loads and stores the stack guard onto the stack.
+ /// - The epilogue checks the value stored in the prologue against the
+ /// original value. It calls __stack_chk_fail if they differ.
+ bool InsertStackProtectors();
+
+ /// CreateFailBB - Create a basic block to jump to when the stack protector
+ /// check fails.
+ BasicBlock *CreateFailBB();
+
+ /// ContainsProtectableArray - Check whether the type either is an array or
+ /// contains an array of sufficient size so that we need stack protectors
+ /// for it.
+ /// \param [out] IsLarge is set to true if a protectable array is found and
+ /// it is "large" ( >= ssp-buffer-size). In the case of a structure with
+ /// multiple arrays, this gets set if any of them is large.
+ bool ContainsProtectableArray(Type *Ty, bool &IsLarge, bool Strong = false,
+ bool InStruct = false) const;
+
+ /// \brief Check whether a stack allocation has its address taken.
+ bool HasAddressTaken(const Instruction *AI);
+
+ /// RequiresStackProtector - Check whether or not this function needs a
+ /// stack protector based upon the stack protector level.
+ bool RequiresStackProtector();
+
+public:
+ static char ID; // Pass identification, replacement for typeid.
+
+ StackProtector() : FunctionPass(ID), SSPBufferSize(8) {
+ initializeStackProtectorPass(*PassRegistry::getPassRegistry());
+ }
+
+ void getAnalysisUsage(AnalysisUsage &AU) const override;
+
+ SSPLayoutKind getSSPLayout(const AllocaInst *AI) const;
+
+ // Return true if StackProtector is supposed to be handled by SelectionDAG.
+ bool shouldEmitSDCheck(const BasicBlock &BB) const;
+
+ void adjustForColoring(const AllocaInst *From, const AllocaInst *To);
+
+ bool runOnFunction(Function &Fn) override;
+};
+
+} // end namespace llvm
+
+#endif // LLVM_CODEGEN_STACKPROTECTOR_H