1 files changed, 0 insertions, 179 deletions
diff --git a/gnu/llvm/lib/Transforms/IPO/CrossDSOCFI.cpp b/gnu/llvm/lib/Transforms/IPO/CrossDSOCFI.cpp
deleted file mode 100644
index 666f6cc37bf..00000000000
--- a/gnu/llvm/lib/Transforms/IPO/CrossDSOCFI.cpp
+++ /dev/null
@@ -1,179 +0,0 @@
-//===-- CrossDSOCFI.cpp - Externalize this module's CFI checks ------------===//
-//
-//                     The LLVM Compiler Infrastructure
-//
-// This file is distributed under the University of Illinois Open Source
-// License. See LICENSE.TXT for details.
-//
-//===----------------------------------------------------------------------===//
-//
-// This pass exports all llvm.bitset's found in the module in the form of a
-// __cfi_check function, which can be used to verify cross-DSO call targets.
-//
-//===----------------------------------------------------------------------===//
-
-#include "llvm/Transforms/IPO/CrossDSOCFI.h"
-#include "llvm/ADT/SetVector.h"
-#include "llvm/ADT/Statistic.h"
-#include "llvm/ADT/Triple.h"
-#include "llvm/IR/Constant.h"
-#include "llvm/IR/Constants.h"
-#include "llvm/IR/Function.h"
-#include "llvm/IR/GlobalObject.h"
-#include "llvm/IR/GlobalVariable.h"
-#include "llvm/IR/IRBuilder.h"
-#include "llvm/IR/Instructions.h"
-#include "llvm/IR/Intrinsics.h"
-#include "llvm/IR/MDBuilder.h"
-#include "llvm/IR/Module.h"
-#include "llvm/IR/Operator.h"
-#include "llvm/Pass.h"
-#include "llvm/Support/Debug.h"
-#include "llvm/Support/raw_ostream.h"
-#include "llvm/Transforms/IPO.h"
-
-using namespace llvm;
-
-#define DEBUG_TYPE "cross-dso-cfi"
-
-STATISTIC(NumTypeIds, "Number of unique type identifiers");
-
-namespace {
-
-struct CrossDSOCFI : public ModulePass {
-  static char ID;
-  CrossDSOCFI() : ModulePass(ID) {
-    initializeCrossDSOCFIPass(*PassRegistry::getPassRegistry());
-  }
-
-  MDNode *VeryLikelyWeights;
-
-  ConstantInt *extractNumericTypeId(MDNode *MD);
-  void buildCFICheck(Module &M);
-  bool runOnModule(Module &M) override;
-};
-
-} // anonymous namespace
-
-INITIALIZE_PASS_BEGIN(CrossDSOCFI, "cross-dso-cfi", "Cross-DSO CFI", false,
-                      false)
-INITIALIZE_PASS_END(CrossDSOCFI, "cross-dso-cfi", "Cross-DSO CFI", false, false)
-char CrossDSOCFI::ID = 0;
-
-ModulePass *llvm::createCrossDSOCFIPass() { return new CrossDSOCFI; }
-
-/// Extracts a numeric type identifier from an MDNode containing type metadata.
-ConstantInt *CrossDSOCFI::extractNumericTypeId(MDNode *MD) {
-  // This check excludes vtables for classes inside anonymous namespaces.
-  auto TM = dyn_cast<ValueAsMetadata>(MD->getOperand(1));
-  if (!TM)
-    return nullptr;
-  auto C = dyn_cast_or_null<ConstantInt>(TM->getValue());
-  if (!C) return nullptr;
-  // We are looking for i64 constants.
-  if (C->getBitWidth() != 64) return nullptr;
-
-  return C;
-}
-
-/// buildCFICheck - emits __cfi_check for the current module.
-void CrossDSOCFI::buildCFICheck(Module &M) {
-  // FIXME: verify that __cfi_check ends up near the end of the code section,
-  // but before the jump slots created in LowerTypeTests.
-  SetVector<uint64_t> TypeIds;
-  SmallVector<MDNode *, 2> Types;
-  for (GlobalObject &GO : M.global_objects()) {
-    Types.clear();
-    GO.getMetadata(LLVMContext::MD_type, Types);
-    for (MDNode *Type : Types) {
-      // Sanity check. GO must not be a function declaration.
-      assert(!isa<Function>(&GO) || !cast<Function>(&GO)->isDeclaration());
-
-      if (ConstantInt *TypeId = extractNumericTypeId(Type))
-        TypeIds.insert(TypeId->getZExtValue());
-    }
-  }
-
-  NamedMDNode *CfiFunctionsMD = M.getNamedMetadata("cfi.functions");
-  if (CfiFunctionsMD) {
-    for (auto Func : CfiFunctionsMD->operands()) {
-      assert(Func->getNumOperands() >= 2);
-      for (unsigned I = 2; I < Func->getNumOperands(); ++I)
-        if (ConstantInt *TypeId =
-                extractNumericTypeId(cast<MDNode>(Func->getOperand(I).get())))
-          TypeIds.insert(TypeId->getZExtValue());
-    }
-  }
-
-  LLVMContext &Ctx = M.getContext();
-  Constant *C = M.getOrInsertFunction(
-      "__cfi_check", Type::getVoidTy(Ctx), Type::getInt64Ty(Ctx),
-      Type::getInt8PtrTy(Ctx), Type::getInt8PtrTy(Ctx));
-  Function *F = dyn_cast<Function>(C);
-  // Take over the existing function. The frontend emits a weak stub so that the
-  // linker knows about the symbol; this pass replaces the function body.
-  F->deleteBody();
-  F->setAlignment(4096);
-
-  Triple T(M.getTargetTriple());
-  if (T.isARM() || T.isThumb())
-    F->addFnAttr("target-features", "+thumb-mode");
-
-  auto args = F->arg_begin();
-  Value &CallSiteTypeId = *(args++);
-  CallSiteTypeId.setName("CallSiteTypeId");
-  Value &Addr = *(args++);
-  Addr.setName("Addr");
-  Value &CFICheckFailData = *(args++);
-  CFICheckFailData.setName("CFICheckFailData");
-  assert(args == F->arg_end());
-
-  BasicBlock *BB = BasicBlock::Create(Ctx, "entry", F);
-  BasicBlock *ExitBB = BasicBlock::Create(Ctx, "exit", F);
-
-  BasicBlock *TrapBB = BasicBlock::Create(Ctx, "fail", F);
-  IRBuilder<> IRBFail(TrapBB);
-  Constant *CFICheckFailFn = M.getOrInsertFunction(
-      "__cfi_check_fail", Type::getVoidTy(Ctx), Type::getInt8PtrTy(Ctx),
-      Type::getInt8PtrTy(Ctx));
-  IRBFail.CreateCall(CFICheckFailFn, {&CFICheckFailData, &Addr});
-  IRBFail.CreateBr(ExitBB);
-
-  IRBuilder<> IRBExit(ExitBB);
-  IRBExit.CreateRetVoid();
-
-  IRBuilder<> IRB(BB);
-  SwitchInst *SI = IRB.CreateSwitch(&CallSiteTypeId, TrapBB, TypeIds.size());
-  for (uint64_t TypeId : TypeIds) {
-    ConstantInt *CaseTypeId = ConstantInt::get(Type::getInt64Ty(Ctx), TypeId);
-    BasicBlock *TestBB = BasicBlock::Create(Ctx, "test", F);
-    IRBuilder<> IRBTest(TestBB);
-    Function *BitsetTestFn = Intrinsic::getDeclaration(&M, Intrinsic::type_test);
-
-    Value *Test = IRBTest.CreateCall(
-        BitsetTestFn, {&Addr, MetadataAsValue::get(
-                                  Ctx, ConstantAsMetadata::get(CaseTypeId))});
-    BranchInst *BI = IRBTest.CreateCondBr(Test, ExitBB, TrapBB);
-    BI->setMetadata(LLVMContext::MD_prof, VeryLikelyWeights);
-
-    SI->addCase(CaseTypeId, TestBB);
-    ++NumTypeIds;
-  }
-}
-
-bool CrossDSOCFI::runOnModule(Module &M) {
-  VeryLikelyWeights =
-    MDBuilder(M.getContext()).createBranchWeights((1U << 20) - 1, 1);
-  if (M.getModuleFlag("Cross-DSO CFI") == nullptr)
-    return false;
-  buildCFICheck(M);
-  return true;
-}
-
-PreservedAnalyses CrossDSOCFIPass::run(Module &M, ModuleAnalysisManager &AM) {
-  CrossDSOCFI Impl;
-  bool Changed = Impl.runOnModule(M);
-  if (!Changed)
-    return PreservedAnalyses::all();
-  return PreservedAnalyses::none();
-}