Imported Upstream version 5.18.0.246

Former-commit-id: 0c7ce5b1a7851e13f22acfd379b7f9fb304e4833

external/llvm/lib/CodeGen/MachineModuleInfo.cpp

@@ -0,0 +1,348 @@
+//===-- llvm/CodeGen/MachineModuleInfo.cpp ----------------------*- C++ -*-===//
+//
+//                     The LLVM Compiler Infrastructure
+//
+// This file is distributed under the University of Illinois Open Source
+// License. See LICENSE.TXT for details.
+//
+//===----------------------------------------------------------------------===//
+
+#include "llvm/CodeGen/MachineModuleInfo.h"
+#include "llvm/ADT/ArrayRef.h"
+#include "llvm/ADT/DenseMap.h"
+#include "llvm/ADT/PostOrderIterator.h"
+#include "llvm/ADT/StringRef.h"
+#include "llvm/ADT/TinyPtrVector.h"
+#include "llvm/CodeGen/MachineFunction.h"
+#include "llvm/CodeGen/Passes.h"
+#include "llvm/CodeGen/TargetLoweringObjectFile.h"
+#include "llvm/IR/BasicBlock.h"
+#include "llvm/IR/DerivedTypes.h"
+#include "llvm/IR/Instructions.h"
+#include "llvm/IR/Module.h"
+#include "llvm/IR/Value.h"
+#include "llvm/IR/ValueHandle.h"
+#include "llvm/MC/MCContext.h"
+#include "llvm/MC/MCSymbol.h"
+#include "llvm/Pass.h"
+#include "llvm/Support/Casting.h"
+#include "llvm/Support/ErrorHandling.h"
+#include "llvm/Target/TargetMachine.h"
+#include <algorithm>
+#include <cassert>
+#include <memory>
+#include <utility>
+#include <vector>
+
+using namespace llvm;
+using namespace llvm::dwarf;
+
+// Handle the Pass registration stuff necessary to use DataLayout's.
+INITIALIZE_PASS(MachineModuleInfo, "machinemoduleinfo",
+                "Machine Module Information", false, false)
+char MachineModuleInfo::ID = 0;
+
+// Out of line virtual method.
+MachineModuleInfoImpl::~MachineModuleInfoImpl() = default;
+
+namespace llvm {
+
+class MMIAddrLabelMapCallbackPtr final : CallbackVH {
+  MMIAddrLabelMap *Map = nullptr;
+
+public:
+  MMIAddrLabelMapCallbackPtr() = default;
+  MMIAddrLabelMapCallbackPtr(Value *V) : CallbackVH(V) {}
+
+  void setPtr(BasicBlock *BB) {
+    ValueHandleBase::operator=(BB);
+  }
+
+  void setMap(MMIAddrLabelMap *map) { Map = map; }
+
+  void deleted() override;
+  void allUsesReplacedWith(Value *V2) override;
+};
+
+class MMIAddrLabelMap {
+  MCContext &Context;
+  struct AddrLabelSymEntry {
+    /// The symbols for the label.
+    TinyPtrVector<MCSymbol *> Symbols;
+
+    Function *Fn;   // The containing function of the BasicBlock.
+    unsigned Index; // The index in BBCallbacks for the BasicBlock.
+  };
+
+  DenseMap<AssertingVH<BasicBlock>, AddrLabelSymEntry> AddrLabelSymbols;
+
+  /// Callbacks for the BasicBlock's that we have entries for.  We use this so
+  /// we get notified if a block is deleted or RAUWd.
+  std::vector<MMIAddrLabelMapCallbackPtr> BBCallbacks;
+
+  /// This is a per-function list of symbols whose corresponding BasicBlock got
+  /// deleted.  These symbols need to be emitted at some point in the file, so
+  /// AsmPrinter emits them after the function body.
+  DenseMap<AssertingVH<Function>, std::vector<MCSymbol*>>
+    DeletedAddrLabelsNeedingEmission;
+
+public:
+  MMIAddrLabelMap(MCContext &context) : Context(context) {}
+
+  ~MMIAddrLabelMap() {
+    assert(DeletedAddrLabelsNeedingEmission.empty() &&
+           "Some labels for deleted blocks never got emitted");
+  }
+
+  ArrayRef<MCSymbol *> getAddrLabelSymbolToEmit(BasicBlock *BB);
+
+  void takeDeletedSymbolsForFunction(Function *F,
+                                     std::vector<MCSymbol*> &Result);
+
+  void UpdateForDeletedBlock(BasicBlock *BB);
+  void UpdateForRAUWBlock(BasicBlock *Old, BasicBlock *New);
+};
+
+} // end namespace llvm
+
+ArrayRef<MCSymbol *> MMIAddrLabelMap::getAddrLabelSymbolToEmit(BasicBlock *BB) {
+  assert(BB->hasAddressTaken() &&
+         "Shouldn't get label for block without address taken");
+  AddrLabelSymEntry &Entry = AddrLabelSymbols[BB];
+
+  // If we already had an entry for this block, just return it.
+  if (!Entry.Symbols.empty()) {
+    assert(BB->getParent() == Entry.Fn && "Parent changed");
+    return Entry.Symbols;
+  }
+
+  // Otherwise, this is a new entry, create a new symbol for it and add an
+  // entry to BBCallbacks so we can be notified if the BB is deleted or RAUWd.
+  BBCallbacks.emplace_back(BB);
+  BBCallbacks.back().setMap(this);
+  Entry.Index = BBCallbacks.size() - 1;
+  Entry.Fn = BB->getParent();
+  Entry.Symbols.push_back(Context.createTempSymbol());
+  return Entry.Symbols;
+}
+
+/// If we have any deleted symbols for F, return them.
+void MMIAddrLabelMap::
+takeDeletedSymbolsForFunction(Function *F, std::vector<MCSymbol*> &Result) {
+  DenseMap<AssertingVH<Function>, std::vector<MCSymbol*>>::iterator I =
+    DeletedAddrLabelsNeedingEmission.find(F);
+
+  // If there are no entries for the function, just return.
+  if (I == DeletedAddrLabelsNeedingEmission.end()) return;
+
+  // Otherwise, take the list.
+  std::swap(Result, I->second);
+  DeletedAddrLabelsNeedingEmission.erase(I);
+}
+
+void MMIAddrLabelMap::UpdateForDeletedBlock(BasicBlock *BB) {
+  // If the block got deleted, there is no need for the symbol.  If the symbol
+  // was already emitted, we can just forget about it, otherwise we need to
+  // queue it up for later emission when the function is output.
+  AddrLabelSymEntry Entry = std::move(AddrLabelSymbols[BB]);
+  AddrLabelSymbols.erase(BB);
+  assert(!Entry.Symbols.empty() && "Didn't have a symbol, why a callback?");
+  BBCallbacks[Entry.Index] = nullptr;  // Clear the callback.
+
+  assert((BB->getParent() == nullptr || BB->getParent() == Entry.Fn) &&
+         "Block/parent mismatch");
+
+  for (MCSymbol *Sym : Entry.Symbols) {
+    if (Sym->isDefined())
+      return;
+
+    // If the block is not yet defined, we need to emit it at the end of the
+    // function.  Add the symbol to the DeletedAddrLabelsNeedingEmission list
+    // for the containing Function.  Since the block is being deleted, its
+    // parent may already be removed, we have to get the function from 'Entry'.
+    DeletedAddrLabelsNeedingEmission[Entry.Fn].push_back(Sym);
+  }
+}
+
+void MMIAddrLabelMap::UpdateForRAUWBlock(BasicBlock *Old, BasicBlock *New) {
+  // Get the entry for the RAUW'd block and remove it from our map.
+  AddrLabelSymEntry OldEntry = std::move(AddrLabelSymbols[Old]);
+  AddrLabelSymbols.erase(Old);
+  assert(!OldEntry.Symbols.empty() && "Didn't have a symbol, why a callback?");
+
+  AddrLabelSymEntry &NewEntry = AddrLabelSymbols[New];
+
+  // If New is not address taken, just move our symbol over to it.
+  if (NewEntry.Symbols.empty()) {
+    BBCallbacks[OldEntry.Index].setPtr(New);    // Update the callback.
+    NewEntry = std::move(OldEntry);             // Set New's entry.
+    return;
+  }
+
+  BBCallbacks[OldEntry.Index] = nullptr;    // Update the callback.
+
+  // Otherwise, we need to add the old symbols to the new block's set.
+  NewEntry.Symbols.insert(NewEntry.Symbols.end(), OldEntry.Symbols.begin(),
+                          OldEntry.Symbols.end());
+}
+
+void MMIAddrLabelMapCallbackPtr::deleted() {
+  Map->UpdateForDeletedBlock(cast<BasicBlock>(getValPtr()));
+}
+
+void MMIAddrLabelMapCallbackPtr::allUsesReplacedWith(Value *V2) {
+  Map->UpdateForRAUWBlock(cast<BasicBlock>(getValPtr()), cast<BasicBlock>(V2));
+}
+
+MachineModuleInfo::MachineModuleInfo(const TargetMachine *TM)
+  : ImmutablePass(ID), TM(*TM),
+    Context(TM->getMCAsmInfo(), TM->getMCRegisterInfo(),
+            TM->getObjFileLowering(), nullptr, false) {
+  initializeMachineModuleInfoPass(*PassRegistry::getPassRegistry());
+}
+
+MachineModuleInfo::~MachineModuleInfo() = default;
+
+bool MachineModuleInfo::doInitialization(Module &M) {
+  ObjFileMMI = nullptr;
+  CurCallSite = 0;
+  DbgInfoAvailable = UsesVAFloatArgument = UsesMorestackAddr = false;
+  HasSplitStack = HasNosplitStack = false;
+  AddrLabelSymbols = nullptr;
+  TheModule = &M;
+  return false;
+}
+
+bool MachineModuleInfo::doFinalization(Module &M) {
+  Personalities.clear();
+
+  delete AddrLabelSymbols;
+  AddrLabelSymbols = nullptr;
+
+  Context.reset();
+
+  delete ObjFileMMI;
+  ObjFileMMI = nullptr;
+
+  return false;
+}
+
+//===- Address of Block Management ----------------------------------------===//
+
+ArrayRef<MCSymbol *>
+MachineModuleInfo::getAddrLabelSymbolToEmit(const BasicBlock *BB) {
+  // Lazily create AddrLabelSymbols.
+  if (!AddrLabelSymbols)
+    AddrLabelSymbols = new MMIAddrLabelMap(Context);
+ return AddrLabelSymbols->getAddrLabelSymbolToEmit(const_cast<BasicBlock*>(BB));
+}
+
+void MachineModuleInfo::
+takeDeletedSymbolsForFunction(const Function *F,
+                              std::vector<MCSymbol*> &Result) {
+  // If no blocks have had their addresses taken, we're done.
+  if (!AddrLabelSymbols) return;
+  return AddrLabelSymbols->
+     takeDeletedSymbolsForFunction(const_cast<Function*>(F), Result);
+}
+
+/// \name Exception Handling
+/// \{
+
+void MachineModuleInfo::addPersonality(const Function *Personality) {
+  for (unsigned i = 0; i < Personalities.size(); ++i)
+    if (Personalities[i] == Personality)
+      return;
+  Personalities.push_back(Personality);
+}
+
+/// \}
+
+MachineFunction *
+MachineModuleInfo::getMachineFunction(const Function &F) const {
+  auto I = MachineFunctions.find(&F);
+  return I != MachineFunctions.end() ? I->second.get() : nullptr;
+}
+
+MachineFunction &
+MachineModuleInfo::getOrCreateMachineFunction(const Function &F) {
+  // Shortcut for the common case where a sequence of MachineFunctionPasses
+  // all query for the same Function.
+  if (LastRequest == &F)
+    return *LastResult;
+
+  auto I = MachineFunctions.insert(
+      std::make_pair(&F, std::unique_ptr<MachineFunction>()));
+  MachineFunction *MF;
+  if (I.second) {
+    // No pre-existing machine function, create a new one.
+    const TargetSubtargetInfo &STI = *TM.getSubtargetImpl(F);
+    MF = new MachineFunction(F, TM, STI, NextFnNum++, *this);
+    // Update the set entry.
+    I.first->second.reset(MF);
+  } else {
+    MF = I.first->second.get();
+  }
+
+  LastRequest = &F;
+  LastResult = MF;
+  return *MF;
+}
+
+void MachineModuleInfo::deleteMachineFunctionFor(Function &F) {
+  MachineFunctions.erase(&F);
+  LastRequest = nullptr;
+  LastResult = nullptr;
+}
+
+namespace {
+
+/// This pass frees the MachineFunction object associated with a Function.
+class FreeMachineFunction : public FunctionPass {
+public:
+  static char ID;
+
+  FreeMachineFunction() : FunctionPass(ID) {}
+
+  void getAnalysisUsage(AnalysisUsage &AU) const override {
+    AU.addRequired<MachineModuleInfo>();
+    AU.addPreserved<MachineModuleInfo>();
+  }
+
+  bool runOnFunction(Function &F) override {
+    MachineModuleInfo &MMI = getAnalysis<MachineModuleInfo>();
+    MMI.deleteMachineFunctionFor(F);
+    return true;
+  }
+  
+  StringRef getPassName() const override {
+    return "Free MachineFunction";
+  } 
+};
+
+} // end anonymous namespace
+
+char FreeMachineFunction::ID;
+
+FunctionPass *llvm::createFreeMachineFunctionPass() {
+  return new FreeMachineFunction();
+}
+
+//===- MMI building helpers -----------------------------------------------===//
+
+void llvm::computeUsesVAFloatArgument(const CallInst &I,
+                                      MachineModuleInfo &MMI) {
+  FunctionType *FT =
+      cast<FunctionType>(I.getCalledValue()->getType()->getContainedType(0));
+  if (FT->isVarArg() && !MMI.usesVAFloatArgument()) {
+    for (unsigned i = 0, e = I.getNumArgOperands(); i != e; ++i) {
+      Type *T = I.getArgOperand(i)->getType();
+      for (auto i : post_order(T)) {
+        if (i->isFloatingPointTy()) {
+          MMI.setUsesVAFloatArgument(true);
+          return;
+        }
+      }
+    }
+  }
+}