mirror of
https://github.com/c64scene-ar/llvm-6502.git
synced 2024-12-14 11:32:34 +00:00
890c16626f
Summary: Before this change, personality directives were not emitted if there was no invoke left in the function (of course until recently this also meant that we couldn't know what the personality actually was). This patch forces personality directives to still be emitted, unless it is known to be a noop in the absence of invokes, or the user explicitly specified `nounwind` (and not `uwtable`) on the function. Reviewers: majnemer, rnk Subscribers: rnk, llvm-commits Differential Revision: http://reviews.llvm.org/D10884 git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@242185 91177308-0d34-0410-b5e6-96231b3b80d8
537 lines
18 KiB
C++
537 lines
18 KiB
C++
//===-- llvm/CodeGen/MachineModuleInfo.cpp ----------------------*- C++ -*-===//
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//
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// The LLVM Compiler Infrastructure
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//
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// This file is distributed under the University of Illinois Open Source
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// License. See LICENSE.TXT for details.
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//
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//===----------------------------------------------------------------------===//
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#include "llvm/CodeGen/MachineModuleInfo.h"
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#include "llvm/ADT/PointerUnion.h"
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#include "llvm/Analysis/LibCallSemantics.h"
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#include "llvm/Analysis/ValueTracking.h"
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#include "llvm/CodeGen/MachineFunction.h"
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#include "llvm/CodeGen/MachineFunctionPass.h"
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#include "llvm/CodeGen/Passes.h"
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#include "llvm/CodeGen/WinEHFuncInfo.h"
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#include "llvm/IR/Constants.h"
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#include "llvm/IR/DerivedTypes.h"
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#include "llvm/IR/GlobalVariable.h"
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#include "llvm/IR/Module.h"
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#include "llvm/MC/MCObjectFileInfo.h"
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#include "llvm/MC/MCSymbol.h"
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#include "llvm/Support/Dwarf.h"
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#include "llvm/Support/ErrorHandling.h"
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using namespace llvm;
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using namespace llvm::dwarf;
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// Handle the Pass registration stuff necessary to use DataLayout's.
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INITIALIZE_PASS(MachineModuleInfo, "machinemoduleinfo",
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"Machine Module Information", false, false)
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char MachineModuleInfo::ID = 0;
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// Out of line virtual method.
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MachineModuleInfoImpl::~MachineModuleInfoImpl() {}
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namespace llvm {
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class MMIAddrLabelMapCallbackPtr : CallbackVH {
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MMIAddrLabelMap *Map;
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public:
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MMIAddrLabelMapCallbackPtr() : Map(nullptr) {}
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MMIAddrLabelMapCallbackPtr(Value *V) : CallbackVH(V), Map(nullptr) {}
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void setPtr(BasicBlock *BB) {
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ValueHandleBase::operator=(BB);
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}
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void setMap(MMIAddrLabelMap *map) { Map = map; }
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void deleted() override;
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void allUsesReplacedWith(Value *V2) override;
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};
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class MMIAddrLabelMap {
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MCContext &Context;
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struct AddrLabelSymEntry {
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/// Symbols - The symbols for the label.
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TinyPtrVector<MCSymbol *> Symbols;
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Function *Fn; // The containing function of the BasicBlock.
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unsigned Index; // The index in BBCallbacks for the BasicBlock.
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};
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DenseMap<AssertingVH<BasicBlock>, AddrLabelSymEntry> AddrLabelSymbols;
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/// BBCallbacks - Callbacks for the BasicBlock's that we have entries for. We
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/// use this so we get notified if a block is deleted or RAUWd.
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std::vector<MMIAddrLabelMapCallbackPtr> BBCallbacks;
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/// DeletedAddrLabelsNeedingEmission - This is a per-function list of symbols
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/// whose corresponding BasicBlock got deleted. These symbols need to be
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/// emitted at some point in the file, so AsmPrinter emits them after the
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/// function body.
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DenseMap<AssertingVH<Function>, std::vector<MCSymbol*> >
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DeletedAddrLabelsNeedingEmission;
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public:
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MMIAddrLabelMap(MCContext &context) : Context(context) {}
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~MMIAddrLabelMap() {
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assert(DeletedAddrLabelsNeedingEmission.empty() &&
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"Some labels for deleted blocks never got emitted");
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}
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ArrayRef<MCSymbol *> getAddrLabelSymbolToEmit(BasicBlock *BB);
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void takeDeletedSymbolsForFunction(Function *F,
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std::vector<MCSymbol*> &Result);
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void UpdateForDeletedBlock(BasicBlock *BB);
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void UpdateForRAUWBlock(BasicBlock *Old, BasicBlock *New);
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};
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}
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ArrayRef<MCSymbol *> MMIAddrLabelMap::getAddrLabelSymbolToEmit(BasicBlock *BB) {
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assert(BB->hasAddressTaken() &&
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"Shouldn't get label for block without address taken");
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AddrLabelSymEntry &Entry = AddrLabelSymbols[BB];
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// If we already had an entry for this block, just return it.
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if (!Entry.Symbols.empty()) {
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assert(BB->getParent() == Entry.Fn && "Parent changed");
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return Entry.Symbols;
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}
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// Otherwise, this is a new entry, create a new symbol for it and add an
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// entry to BBCallbacks so we can be notified if the BB is deleted or RAUWd.
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BBCallbacks.emplace_back(BB);
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BBCallbacks.back().setMap(this);
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Entry.Index = BBCallbacks.size() - 1;
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Entry.Fn = BB->getParent();
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Entry.Symbols.push_back(Context.createTempSymbol());
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return Entry.Symbols;
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}
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/// takeDeletedSymbolsForFunction - If we have any deleted symbols for F, return
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/// them.
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void MMIAddrLabelMap::
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takeDeletedSymbolsForFunction(Function *F, std::vector<MCSymbol*> &Result) {
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DenseMap<AssertingVH<Function>, std::vector<MCSymbol*> >::iterator I =
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DeletedAddrLabelsNeedingEmission.find(F);
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// If there are no entries for the function, just return.
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if (I == DeletedAddrLabelsNeedingEmission.end()) return;
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// Otherwise, take the list.
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std::swap(Result, I->second);
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DeletedAddrLabelsNeedingEmission.erase(I);
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}
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void MMIAddrLabelMap::UpdateForDeletedBlock(BasicBlock *BB) {
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// If the block got deleted, there is no need for the symbol. If the symbol
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// was already emitted, we can just forget about it, otherwise we need to
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// queue it up for later emission when the function is output.
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AddrLabelSymEntry Entry = std::move(AddrLabelSymbols[BB]);
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AddrLabelSymbols.erase(BB);
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assert(!Entry.Symbols.empty() && "Didn't have a symbol, why a callback?");
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BBCallbacks[Entry.Index] = nullptr; // Clear the callback.
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assert((BB->getParent() == nullptr || BB->getParent() == Entry.Fn) &&
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"Block/parent mismatch");
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for (MCSymbol *Sym : Entry.Symbols) {
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if (Sym->isDefined())
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return;
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// If the block is not yet defined, we need to emit it at the end of the
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// function. Add the symbol to the DeletedAddrLabelsNeedingEmission list
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// for the containing Function. Since the block is being deleted, its
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// parent may already be removed, we have to get the function from 'Entry'.
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DeletedAddrLabelsNeedingEmission[Entry.Fn].push_back(Sym);
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}
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}
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void MMIAddrLabelMap::UpdateForRAUWBlock(BasicBlock *Old, BasicBlock *New) {
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// Get the entry for the RAUW'd block and remove it from our map.
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AddrLabelSymEntry OldEntry = std::move(AddrLabelSymbols[Old]);
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AddrLabelSymbols.erase(Old);
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assert(!OldEntry.Symbols.empty() && "Didn't have a symbol, why a callback?");
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AddrLabelSymEntry &NewEntry = AddrLabelSymbols[New];
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// If New is not address taken, just move our symbol over to it.
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if (NewEntry.Symbols.empty()) {
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BBCallbacks[OldEntry.Index].setPtr(New); // Update the callback.
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NewEntry = std::move(OldEntry); // Set New's entry.
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return;
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}
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BBCallbacks[OldEntry.Index] = nullptr; // Update the callback.
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// Otherwise, we need to add the old symbols to the new block's set.
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NewEntry.Symbols.insert(NewEntry.Symbols.end(), OldEntry.Symbols.begin(),
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OldEntry.Symbols.end());
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}
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void MMIAddrLabelMapCallbackPtr::deleted() {
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Map->UpdateForDeletedBlock(cast<BasicBlock>(getValPtr()));
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}
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void MMIAddrLabelMapCallbackPtr::allUsesReplacedWith(Value *V2) {
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Map->UpdateForRAUWBlock(cast<BasicBlock>(getValPtr()), cast<BasicBlock>(V2));
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}
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//===----------------------------------------------------------------------===//
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MachineModuleInfo::MachineModuleInfo(const MCAsmInfo &MAI,
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const MCRegisterInfo &MRI,
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const MCObjectFileInfo *MOFI)
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: ImmutablePass(ID), Context(&MAI, &MRI, MOFI, nullptr, false) {
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initializeMachineModuleInfoPass(*PassRegistry::getPassRegistry());
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}
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MachineModuleInfo::MachineModuleInfo()
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: ImmutablePass(ID), Context(nullptr, nullptr, nullptr) {
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llvm_unreachable("This MachineModuleInfo constructor should never be called, "
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"MMI should always be explicitly constructed by "
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"LLVMTargetMachine");
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}
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MachineModuleInfo::~MachineModuleInfo() {
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}
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bool MachineModuleInfo::doInitialization(Module &M) {
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ObjFileMMI = nullptr;
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CurCallSite = 0;
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CallsEHReturn = false;
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CallsUnwindInit = false;
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DbgInfoAvailable = UsesVAFloatArgument = UsesMorestackAddr = false;
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// Always emit some info, by default "no personality" info.
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Personalities.push_back(nullptr);
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PersonalityTypeCache = EHPersonality::Unknown;
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AddrLabelSymbols = nullptr;
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TheModule = nullptr;
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return false;
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}
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bool MachineModuleInfo::doFinalization(Module &M) {
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Personalities.clear();
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delete AddrLabelSymbols;
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AddrLabelSymbols = nullptr;
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Context.reset();
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delete ObjFileMMI;
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ObjFileMMI = nullptr;
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return false;
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}
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/// EndFunction - Discard function meta information.
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///
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void MachineModuleInfo::EndFunction() {
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// Clean up frame info.
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FrameInstructions.clear();
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// Clean up exception info.
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LandingPads.clear();
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PersonalityTypeCache = EHPersonality::Unknown;
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CallSiteMap.clear();
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TypeInfos.clear();
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FilterIds.clear();
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FilterEnds.clear();
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CallsEHReturn = false;
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CallsUnwindInit = false;
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VariableDbgInfos.clear();
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}
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//===- Address of Block Management ----------------------------------------===//
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/// getAddrLabelSymbolToEmit - Return the symbol to be used for the specified
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/// basic block when its address is taken. If other blocks were RAUW'd to
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/// this one, we may have to emit them as well, return the whole set.
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ArrayRef<MCSymbol *>
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MachineModuleInfo::getAddrLabelSymbolToEmit(const BasicBlock *BB) {
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// Lazily create AddrLabelSymbols.
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if (!AddrLabelSymbols)
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AddrLabelSymbols = new MMIAddrLabelMap(Context);
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return AddrLabelSymbols->getAddrLabelSymbolToEmit(const_cast<BasicBlock*>(BB));
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}
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/// takeDeletedSymbolsForFunction - If the specified function has had any
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/// references to address-taken blocks generated, but the block got deleted,
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/// return the symbol now so we can emit it. This prevents emitting a
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/// reference to a symbol that has no definition.
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void MachineModuleInfo::
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takeDeletedSymbolsForFunction(const Function *F,
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std::vector<MCSymbol*> &Result) {
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// If no blocks have had their addresses taken, we're done.
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if (!AddrLabelSymbols) return;
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return AddrLabelSymbols->
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takeDeletedSymbolsForFunction(const_cast<Function*>(F), Result);
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}
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//===- EH -----------------------------------------------------------------===//
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/// getOrCreateLandingPadInfo - Find or create an LandingPadInfo for the
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/// specified MachineBasicBlock.
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LandingPadInfo &MachineModuleInfo::getOrCreateLandingPadInfo
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(MachineBasicBlock *LandingPad) {
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unsigned N = LandingPads.size();
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for (unsigned i = 0; i < N; ++i) {
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LandingPadInfo &LP = LandingPads[i];
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if (LP.LandingPadBlock == LandingPad)
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return LP;
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}
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LandingPads.push_back(LandingPadInfo(LandingPad));
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return LandingPads[N];
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}
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/// addInvoke - Provide the begin and end labels of an invoke style call and
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/// associate it with a try landing pad block.
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void MachineModuleInfo::addInvoke(MachineBasicBlock *LandingPad,
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MCSymbol *BeginLabel, MCSymbol *EndLabel) {
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LandingPadInfo &LP = getOrCreateLandingPadInfo(LandingPad);
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LP.BeginLabels.push_back(BeginLabel);
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LP.EndLabels.push_back(EndLabel);
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}
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/// addLandingPad - Provide the label of a try LandingPad block.
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///
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MCSymbol *MachineModuleInfo::addLandingPad(MachineBasicBlock *LandingPad) {
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MCSymbol *LandingPadLabel = Context.createTempSymbol();
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LandingPadInfo &LP = getOrCreateLandingPadInfo(LandingPad);
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LP.LandingPadLabel = LandingPadLabel;
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return LandingPadLabel;
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}
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/// addPersonality - Provide the personality function for the exception
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/// information.
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void MachineModuleInfo::addPersonality(MachineBasicBlock *LandingPad,
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const Function *Personality) {
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LandingPadInfo &LP = getOrCreateLandingPadInfo(LandingPad);
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LP.Personality = Personality;
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addPersonality(Personality);
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}
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void MachineModuleInfo::addPersonality(const Function *Personality) {
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for (unsigned i = 0; i < Personalities.size(); ++i)
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if (Personalities[i] == Personality)
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return;
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// If this is the first personality we're adding go
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// ahead and add it at the beginning.
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if (!Personalities[0])
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Personalities[0] = Personality;
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else
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Personalities.push_back(Personality);
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}
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void MachineModuleInfo::addWinEHState(MachineBasicBlock *LandingPad,
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int State) {
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LandingPadInfo &LP = getOrCreateLandingPadInfo(LandingPad);
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LP.WinEHState = State;
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}
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/// addCatchTypeInfo - Provide the catch typeinfo for a landing pad.
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///
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void MachineModuleInfo::
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addCatchTypeInfo(MachineBasicBlock *LandingPad,
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ArrayRef<const GlobalValue *> TyInfo) {
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LandingPadInfo &LP = getOrCreateLandingPadInfo(LandingPad);
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for (unsigned N = TyInfo.size(); N; --N)
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LP.TypeIds.push_back(getTypeIDFor(TyInfo[N - 1]));
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}
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/// addFilterTypeInfo - Provide the filter typeinfo for a landing pad.
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///
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void MachineModuleInfo::
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addFilterTypeInfo(MachineBasicBlock *LandingPad,
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ArrayRef<const GlobalValue *> TyInfo) {
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LandingPadInfo &LP = getOrCreateLandingPadInfo(LandingPad);
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std::vector<unsigned> IdsInFilter(TyInfo.size());
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for (unsigned I = 0, E = TyInfo.size(); I != E; ++I)
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IdsInFilter[I] = getTypeIDFor(TyInfo[I]);
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LP.TypeIds.push_back(getFilterIDFor(IdsInFilter));
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}
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/// addCleanup - Add a cleanup action for a landing pad.
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///
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void MachineModuleInfo::addCleanup(MachineBasicBlock *LandingPad) {
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LandingPadInfo &LP = getOrCreateLandingPadInfo(LandingPad);
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LP.TypeIds.push_back(0);
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}
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void MachineModuleInfo::addSEHCatchHandler(MachineBasicBlock *LandingPad,
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const Function *Filter,
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const BlockAddress *RecoverBA) {
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LandingPadInfo &LP = getOrCreateLandingPadInfo(LandingPad);
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SEHHandler Handler;
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Handler.FilterOrFinally = Filter;
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Handler.RecoverBA = RecoverBA;
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LP.SEHHandlers.push_back(Handler);
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}
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void MachineModuleInfo::addSEHCleanupHandler(MachineBasicBlock *LandingPad,
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const Function *Cleanup) {
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LandingPadInfo &LP = getOrCreateLandingPadInfo(LandingPad);
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SEHHandler Handler;
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Handler.FilterOrFinally = Cleanup;
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Handler.RecoverBA = nullptr;
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LP.SEHHandlers.push_back(Handler);
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}
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/// TidyLandingPads - Remap landing pad labels and remove any deleted landing
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/// pads.
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void MachineModuleInfo::TidyLandingPads(DenseMap<MCSymbol*, uintptr_t> *LPMap) {
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for (unsigned i = 0; i != LandingPads.size(); ) {
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LandingPadInfo &LandingPad = LandingPads[i];
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if (LandingPad.LandingPadLabel &&
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!LandingPad.LandingPadLabel->isDefined() &&
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(!LPMap || (*LPMap)[LandingPad.LandingPadLabel] == 0))
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LandingPad.LandingPadLabel = nullptr;
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// Special case: we *should* emit LPs with null LP MBB. This indicates
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// "nounwind" case.
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if (!LandingPad.LandingPadLabel && LandingPad.LandingPadBlock) {
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LandingPads.erase(LandingPads.begin() + i);
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continue;
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}
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for (unsigned j = 0, e = LandingPads[i].BeginLabels.size(); j != e; ++j) {
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MCSymbol *BeginLabel = LandingPad.BeginLabels[j];
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MCSymbol *EndLabel = LandingPad.EndLabels[j];
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if ((BeginLabel->isDefined() ||
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(LPMap && (*LPMap)[BeginLabel] != 0)) &&
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(EndLabel->isDefined() ||
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(LPMap && (*LPMap)[EndLabel] != 0))) continue;
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LandingPad.BeginLabels.erase(LandingPad.BeginLabels.begin() + j);
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LandingPad.EndLabels.erase(LandingPad.EndLabels.begin() + j);
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--j, --e;
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}
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// Remove landing pads with no try-ranges.
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if (LandingPads[i].BeginLabels.empty()) {
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LandingPads.erase(LandingPads.begin() + i);
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continue;
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}
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// If there is no landing pad, ensure that the list of typeids is empty.
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// If the only typeid is a cleanup, this is the same as having no typeids.
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if (!LandingPad.LandingPadBlock ||
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(LandingPad.TypeIds.size() == 1 && !LandingPad.TypeIds[0]))
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LandingPad.TypeIds.clear();
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++i;
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}
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}
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/// setCallSiteLandingPad - Map the landing pad's EH symbol to the call site
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/// indexes.
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void MachineModuleInfo::setCallSiteLandingPad(MCSymbol *Sym,
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ArrayRef<unsigned> Sites) {
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LPadToCallSiteMap[Sym].append(Sites.begin(), Sites.end());
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}
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/// getTypeIDFor - Return the type id for the specified typeinfo. This is
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/// function wide.
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unsigned MachineModuleInfo::getTypeIDFor(const GlobalValue *TI) {
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for (unsigned i = 0, N = TypeInfos.size(); i != N; ++i)
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if (TypeInfos[i] == TI) return i + 1;
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TypeInfos.push_back(TI);
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return TypeInfos.size();
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}
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/// getFilterIDFor - Return the filter id for the specified typeinfos. This is
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/// function wide.
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int MachineModuleInfo::getFilterIDFor(std::vector<unsigned> &TyIds) {
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// If the new filter coincides with the tail of an existing filter, then
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// re-use the existing filter. Folding filters more than this requires
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// re-ordering filters and/or their elements - probably not worth it.
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for (std::vector<unsigned>::iterator I = FilterEnds.begin(),
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E = FilterEnds.end(); I != E; ++I) {
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unsigned i = *I, j = TyIds.size();
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while (i && j)
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if (FilterIds[--i] != TyIds[--j])
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goto try_next;
|
|
|
|
if (!j)
|
|
// The new filter coincides with range [i, end) of the existing filter.
|
|
return -(1 + i);
|
|
|
|
try_next:;
|
|
}
|
|
|
|
// Add the new filter.
|
|
int FilterID = -(1 + FilterIds.size());
|
|
FilterIds.reserve(FilterIds.size() + TyIds.size() + 1);
|
|
FilterIds.insert(FilterIds.end(), TyIds.begin(), TyIds.end());
|
|
FilterEnds.push_back(FilterIds.size());
|
|
FilterIds.push_back(0); // terminator
|
|
return FilterID;
|
|
}
|
|
|
|
/// getPersonality - Return the personality function for the current function.
|
|
const Function *MachineModuleInfo::getPersonality() const {
|
|
for (const LandingPadInfo &LPI : LandingPads)
|
|
if (LPI.Personality)
|
|
return LPI.Personality;
|
|
return nullptr;
|
|
}
|
|
|
|
EHPersonality MachineModuleInfo::getPersonalityType() {
|
|
if (PersonalityTypeCache == EHPersonality::Unknown) {
|
|
if (const Function *F = getPersonality())
|
|
PersonalityTypeCache = classifyEHPersonality(F);
|
|
}
|
|
return PersonalityTypeCache;
|
|
}
|
|
|
|
/// getPersonalityIndex - Return unique index for current personality
|
|
/// function. NULL/first personality function should always get zero index.
|
|
unsigned MachineModuleInfo::getPersonalityIndex() const {
|
|
const Function* Personality = nullptr;
|
|
|
|
// Scan landing pads. If there is at least one non-NULL personality - use it.
|
|
for (unsigned i = 0, e = LandingPads.size(); i != e; ++i)
|
|
if (LandingPads[i].Personality) {
|
|
Personality = LandingPads[i].Personality;
|
|
break;
|
|
}
|
|
|
|
for (unsigned i = 0, e = Personalities.size(); i < e; ++i) {
|
|
if (Personalities[i] == Personality)
|
|
return i;
|
|
}
|
|
|
|
// This will happen if the current personality function is
|
|
// in the zero index.
|
|
return 0;
|
|
}
|
|
|
|
const Function *MachineModuleInfo::getWinEHParent(const Function *F) const {
|
|
StringRef WinEHParentName =
|
|
F->getFnAttribute("wineh-parent").getValueAsString();
|
|
if (WinEHParentName.empty() || WinEHParentName == F->getName())
|
|
return F;
|
|
return F->getParent()->getFunction(WinEHParentName);
|
|
}
|
|
|
|
WinEHFuncInfo &MachineModuleInfo::getWinEHFuncInfo(const Function *F) {
|
|
auto &Ptr = FuncInfoMap[getWinEHParent(F)];
|
|
if (!Ptr)
|
|
Ptr.reset(new WinEHFuncInfo);
|
|
return *Ptr;
|
|
}
|