am 31195f0b: Merge "Update aosp/master llvm for rebase to r233350"

* commit '31195f0bdca6ee2a5e72d07edf13e1d81206d949':
  Update aosp/master llvm for rebase to r233350

1 files changed, 0 insertions, 296 deletions

diff --git a/lib/CodeGen/JumpInstrTables.cpp b/lib/CodeGen/JumpInstrTables.cpp
deleted file mode 100644
index 75fa261..0000000
--- a/lib/CodeGen/JumpInstrTables.cpp
+++ /dev/null
@@ -1,296 +0,0 @@
-//===-- JumpInstrTables.cpp: Jump-Instruction Tables ----------------------===//
-//
-// This file is distributed under the University of Illinois Open Source
-// License. See LICENSE.TXT for details.
-//
-//===----------------------------------------------------------------------===//
-///
-/// \file
-/// \brief An implementation of jump-instruction tables.
-///
-//===----------------------------------------------------------------------===//
-
-#define DEBUG_TYPE "jt"
-
-#include "llvm/CodeGen/JumpInstrTables.h"
-#include "llvm/ADT/Statistic.h"
-#include "llvm/Analysis/JumpInstrTableInfo.h"
-#include "llvm/CodeGen/Passes.h"
-#include "llvm/IR/Attributes.h"
-#include "llvm/IR/CallSite.h"
-#include "llvm/IR/Constants.h"
-#include "llvm/IR/DerivedTypes.h"
-#include "llvm/IR/Function.h"
-#include "llvm/IR/LLVMContext.h"
-#include "llvm/IR/Module.h"
-#include "llvm/IR/Operator.h"
-#include "llvm/IR/Type.h"
-#include "llvm/IR/Verifier.h"
-#include "llvm/Support/CommandLine.h"
-#include "llvm/Support/Debug.h"
-#include "llvm/Support/raw_ostream.h"
-#include <vector>
-
-using namespace llvm;
-
-char JumpInstrTables::ID = 0;
-
-INITIALIZE_PASS_BEGIN(JumpInstrTables, "jump-instr-tables",
-                      "Jump-Instruction Tables", true, true)
-INITIALIZE_PASS_DEPENDENCY(JumpInstrTableInfo);
-INITIALIZE_PASS_END(JumpInstrTables, "jump-instr-tables",
-                    "Jump-Instruction Tables", true, true)
-
-STATISTIC(NumJumpTables, "Number of indirect call tables generated");
-STATISTIC(NumFuncsInJumpTables, "Number of functions in the jump tables");
-
-ModulePass *llvm::createJumpInstrTablesPass() {
-  // The default implementation uses a single table for all functions.
-  return new JumpInstrTables(JumpTable::Single);
-}
-
-ModulePass *llvm::createJumpInstrTablesPass(JumpTable::JumpTableType JTT) {
-  return new JumpInstrTables(JTT);
-}
-
-namespace {
-static const char jump_func_prefix[] = "__llvm_jump_instr_table_";
-static const char jump_section_prefix[] = ".jump.instr.table.text.";
-
-// Checks to see if a given CallSite is making an indirect call, including
-// cases where the indirect call is made through a bitcast.
-bool isIndirectCall(CallSite &CS) {
-  if (CS.getCalledFunction())
-    return false;
-
-  // Check the value to see if it is merely a bitcast of a function. In
-  // this case, it will translate to a direct function call in the resulting
-  // assembly, so we won't treat it as an indirect call here.
-  const Value *V = CS.getCalledValue();
-  if (const ConstantExpr *CE = dyn_cast<ConstantExpr>(V)) {
-    return !(CE->isCast() && isa<Function>(CE->getOperand(0)));
-  }
-
-  // Otherwise, since we know it's a call, it must be an indirect call
-  return true;
-}
-
-// Replaces Functions and GlobalAliases with a different Value.
-bool replaceGlobalValueIndirectUse(GlobalValue *GV, Value *V, Use *U) {
-  User *Us = U->getUser();
-  if (!Us)
-    return false;
-  if (Instruction *I = dyn_cast<Instruction>(Us)) {
-    CallSite CS(I);
-
-    // Don't do the replacement if this use is a direct call to this function.
-    // If the use is not the called value, then replace it.
-    if (CS && (isIndirectCall(CS) || CS.isCallee(U))) {
-      return false;
-    }
-
-    U->set(V);
-  } else if (Constant *C = dyn_cast<Constant>(Us)) {
-    // Don't replace calls to bitcasts of function symbols, since they get
-    // translated to direct calls.
-    if (ConstantExpr *CE = dyn_cast<ConstantExpr>(Us)) {
-      if (CE->getOpcode() == Instruction::BitCast) {
-        // This bitcast must have exactly one user.
-        if (CE->user_begin() != CE->user_end()) {
-          User *ParentUs = *CE->user_begin();
-          if (CallInst *CI = dyn_cast<CallInst>(ParentUs)) {
-            CallSite CS(CI);
-            Use &CEU = *CE->use_begin();
-            if (CS.isCallee(&CEU)) {
-              return false;
-            }
-          }
-        }
-      }
-    }
-
-    // GlobalAlias doesn't support replaceUsesOfWithOnConstant. And the verifier
-    // requires alias to point to a defined function. So, GlobalAlias is handled
-    // as a separate case in runOnModule.
-    if (!isa<GlobalAlias>(C))
-      C->replaceUsesOfWithOnConstant(GV, V, U);
-  } else {
-    llvm_unreachable("The Use of a Function symbol is neither an instruction "
-                     "nor a constant");
-  }
-
-  return true;
-}
-
-// Replaces all replaceable address-taken uses of GV with a pointer to a
-// jump-instruction table entry.
-void replaceValueWithFunction(GlobalValue *GV, Function *F) {
-  // Go through all uses of this function and replace the uses of GV with the
-  // jump-table version of the function. Get the uses as a vector before
-  // replacing them, since replacing them changes the use list and invalidates
-  // the iterator otherwise.
-  for (Value::use_iterator I = GV->use_begin(), E = GV->use_end(); I != E;) {
-    Use &U = *I++;
-
-    // Replacement of constants replaces all instances in the constant. So, some
-    // uses might have already been handled by the time we reach them here.
-    if (U.get() == GV)
-      replaceGlobalValueIndirectUse(GV, F, &U);
-  }
-
-  return;
-}
-} // end anonymous namespace
-
-JumpInstrTables::JumpInstrTables()
-    : ModulePass(ID), Metadata(), JITI(nullptr), TableCount(0),
-      JTType(JumpTable::Single) {
-  initializeJumpInstrTablesPass(*PassRegistry::getPassRegistry());
-}
-
-JumpInstrTables::JumpInstrTables(JumpTable::JumpTableType JTT)
-    : ModulePass(ID), Metadata(), JITI(nullptr), TableCount(0), JTType(JTT) {
-  initializeJumpInstrTablesPass(*PassRegistry::getPassRegistry());
-}
-
-JumpInstrTables::~JumpInstrTables() {}
-
-void JumpInstrTables::getAnalysisUsage(AnalysisUsage &AU) const {
-  AU.addRequired<JumpInstrTableInfo>();
-}
-
-Function *JumpInstrTables::insertEntry(Module &M, Function *Target) {
-  FunctionType *OrigFunTy = Target->getFunctionType();
-  FunctionType *FunTy = transformType(JTType, OrigFunTy);
-
-  JumpMap::iterator it = Metadata.find(FunTy);
-  if (Metadata.end() == it) {
-    struct TableMeta Meta;
-    Meta.TableNum = TableCount;
-    Meta.Count = 0;
-    Metadata[FunTy] = Meta;
-    it = Metadata.find(FunTy);
-    ++NumJumpTables;
-    ++TableCount;
-  }
-
-  it->second.Count++;
-
-  std::string NewName(jump_func_prefix);
-  NewName += (Twine(it->second.TableNum) + "_" + Twine(it->second.Count)).str();
-  Function *JumpFun =
-      Function::Create(OrigFunTy, GlobalValue::ExternalLinkage, NewName, &M);
-  // The section for this table
-  JumpFun->setSection((jump_section_prefix + Twine(it->second.TableNum)).str());
-  JITI->insertEntry(FunTy, Target, JumpFun);
-
-  ++NumFuncsInJumpTables;
-  return JumpFun;
-}
-
-bool JumpInstrTables::hasTable(FunctionType *FunTy) {
-  FunctionType *TransTy = transformType(JTType, FunTy);
-  return Metadata.end() != Metadata.find(TransTy);
-}
-
-FunctionType *JumpInstrTables::transformType(JumpTable::JumpTableType JTT,
-                                             FunctionType *FunTy) {
-  // Returning nullptr forces all types into the same table, since all types map
-  // to the same type
-  Type *VoidPtrTy = Type::getInt8PtrTy(FunTy->getContext());
-
-  // Ignore the return type.
-  Type *RetTy = VoidPtrTy;
-  bool IsVarArg = FunTy->isVarArg();
-  std::vector<Type *> ParamTys(FunTy->getNumParams());
-  FunctionType::param_iterator PI, PE;
-  int i = 0;
-
-  std::vector<Type *> EmptyParams;
-  Type *Int32Ty = Type::getInt32Ty(FunTy->getContext());
-  FunctionType *VoidFnTy = FunctionType::get(
-      Type::getVoidTy(FunTy->getContext()), EmptyParams, false);
-  switch (JTT) {
-  case JumpTable::Single:
-
-    return FunctionType::get(RetTy, EmptyParams, false);
-  case JumpTable::Arity:
-    // Transform all types to void* so that all functions with the same arity
-    // end up in the same table.
-    for (PI = FunTy->param_begin(), PE = FunTy->param_end(); PI != PE;
-         PI++, i++) {
-      ParamTys[i] = VoidPtrTy;
-    }
-
-    return FunctionType::get(RetTy, ParamTys, IsVarArg);
-  case JumpTable::Simplified:
-    // Project all parameters types to one of 3 types: composite, integer, and
-    // function, matching the three subclasses of Type.
-    for (PI = FunTy->param_begin(), PE = FunTy->param_end(); PI != PE;
-         ++PI, ++i) {
-      assert((isa<IntegerType>(*PI) || isa<FunctionType>(*PI) ||
-              isa<CompositeType>(*PI)) &&
-             "This type is not an Integer or a Composite or a Function");
-      if (isa<CompositeType>(*PI)) {
-        ParamTys[i] = VoidPtrTy;
-      } else if (isa<FunctionType>(*PI)) {
-        ParamTys[i] = VoidFnTy;
-      } else if (isa<IntegerType>(*PI)) {
-        ParamTys[i] = Int32Ty;
-      }
-    }
-
-    return FunctionType::get(RetTy, ParamTys, IsVarArg);
-  case JumpTable::Full:
-    // Don't transform this type at all.
-    return FunTy;
-  }
-
-  return nullptr;
-}
-
-bool JumpInstrTables::runOnModule(Module &M) {
-  JITI = &getAnalysis<JumpInstrTableInfo>();
-
-  // Get the set of jumptable-annotated functions that have their address taken.
-  DenseMap<Function *, Function *> Functions;
-  for (Function &F : M) {
-    if (F.hasFnAttribute(Attribute::JumpTable) && F.hasAddressTaken()) {
-      assert(F.hasUnnamedAddr() &&
-             "Attribute 'jumptable' requires 'unnamed_addr'");
-      Functions[&F] = nullptr;
-    }
-  }
-
-  // Create the jump-table functions.
-  for (auto &KV : Functions) {
-    Function *F = KV.first;
-    KV.second = insertEntry(M, F);
-  }
-
-  // GlobalAlias is a special case, because the target of an alias statement
-  // must be a defined function. So, instead of replacing a given function in
-  // the alias, we replace all uses of aliases that target jumptable functions.
-  // Note that there's no need to create these functions, since only aliases
-  // that target known jumptable functions are replaced, and there's no way to
-  // put the jumptable annotation on a global alias.
-  DenseMap<GlobalAlias *, Function *> Aliases;
-  for (GlobalAlias &GA : M.aliases()) {
-    Constant *Aliasee = GA.getAliasee();
-    if (Function *F = dyn_cast<Function>(Aliasee)) {
-      auto it = Functions.find(F);
-      if (it != Functions.end()) {
-        Aliases[&GA] = it->second;
-      }
-    }
-  }
-
-  // Replace each address taken function with its jump-instruction table entry.
-  for (auto &KV : Functions)
-    replaceValueWithFunction(KV.first, KV.second);
-
-  for (auto &KV : Aliases)
-    replaceValueWithFunction(KV.first, KV.second);
-
-  return !Functions.empty();
-}