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df7a8b162e
This makes it possible for targets to define their own MCObjectFileInfo. This MCObjectFileInfo is then used to determine things like section alignment. This is a follow up to D101462 and prepares for the RISCV backend defining the text section alignment depending on the enabled extensions. Reviewed By: MaskRay Differential Revision: https://reviews.llvm.org/D101921
428 lines
14 KiB
C++
428 lines
14 KiB
C++
//===-- llvm/CodeGen/MachineModuleInfo.cpp ----------------------*- C++ -*-===//
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//
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// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
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// See https://llvm.org/LICENSE.txt for license information.
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// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
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//
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//===----------------------------------------------------------------------===//
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#include "llvm/CodeGen/MachineModuleInfo.h"
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#include "llvm/ADT/ArrayRef.h"
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#include "llvm/ADT/DenseMap.h"
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#include "llvm/ADT/PostOrderIterator.h"
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#include "llvm/ADT/StringRef.h"
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#include "llvm/ADT/TinyPtrVector.h"
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#include "llvm/CodeGen/MachineFunction.h"
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#include "llvm/CodeGen/Passes.h"
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#include "llvm/IR/BasicBlock.h"
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#include "llvm/IR/DerivedTypes.h"
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#include "llvm/IR/DiagnosticInfo.h"
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#include "llvm/IR/Instructions.h"
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#include "llvm/IR/LLVMContext.h"
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#include "llvm/IR/Module.h"
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#include "llvm/IR/Value.h"
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#include "llvm/IR/ValueHandle.h"
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#include "llvm/InitializePasses.h"
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#include "llvm/MC/MCContext.h"
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#include "llvm/MC/MCSymbol.h"
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#include "llvm/MC/MCSymbolXCOFF.h"
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#include "llvm/Pass.h"
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#include "llvm/Support/Casting.h"
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#include "llvm/Support/ErrorHandling.h"
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#include "llvm/Target/TargetLoweringObjectFile.h"
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#include "llvm/Target/TargetMachine.h"
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#include <algorithm>
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#include <cassert>
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#include <memory>
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#include <utility>
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#include <vector>
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using namespace llvm;
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using namespace llvm::dwarf;
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// Out of line virtual method.
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MachineModuleInfoImpl::~MachineModuleInfoImpl() = default;
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namespace llvm {
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class MMIAddrLabelMapCallbackPtr final : CallbackVH {
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MMIAddrLabelMap *Map = nullptr;
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public:
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MMIAddrLabelMapCallbackPtr() = default;
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MMIAddrLabelMapCallbackPtr(Value *V) : CallbackVH(V) {}
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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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/// 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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/// Callbacks for the BasicBlock's that we have entries for. We use this so
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/// we get notified if a block is deleted or RAUWd.
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std::vector<MMIAddrLabelMapCallbackPtr> BBCallbacks;
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/// This is a per-function list of symbols whose corresponding BasicBlock got
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/// deleted. These symbols need to be emitted at some point in the file, so
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/// AsmPrinter emits them after the 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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} // end namespace llvm
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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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MCSymbol *Sym = BB->hasAddressTaken() ? Context.createNamedTempSymbol()
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: Context.createTempSymbol();
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Entry.Symbols.push_back(Sym);
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return Entry.Symbols;
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}
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/// If we have any deleted symbols for F, return 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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llvm::append_range(NewEntry.Symbols, OldEntry.Symbols);
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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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void MachineModuleInfo::initialize() {
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ObjFileMMI = nullptr;
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CurCallSite = 0;
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NextFnNum = 0;
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UsesMSVCFloatingPoint = UsesMorestackAddr = false;
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HasSplitStack = HasNosplitStack = false;
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AddrLabelSymbols = nullptr;
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}
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void MachineModuleInfo::finalize() {
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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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// We don't clear the ExternalContext.
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delete ObjFileMMI;
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ObjFileMMI = nullptr;
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}
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MachineModuleInfo::MachineModuleInfo(MachineModuleInfo &&MMI)
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: TM(std::move(MMI.TM)),
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Context(MMI.TM.getTargetTriple(), MMI.TM.getMCAsmInfo(),
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MMI.TM.getMCRegisterInfo(), MMI.TM.getMCSubtargetInfo(), nullptr,
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nullptr, false),
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MachineFunctions(std::move(MMI.MachineFunctions)) {
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Context.setObjectFileInfo(MMI.TM.getObjFileLowering());
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ObjFileMMI = MMI.ObjFileMMI;
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CurCallSite = MMI.CurCallSite;
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UsesMSVCFloatingPoint = MMI.UsesMSVCFloatingPoint;
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UsesMorestackAddr = MMI.UsesMorestackAddr;
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HasSplitStack = MMI.HasSplitStack;
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HasNosplitStack = MMI.HasNosplitStack;
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AddrLabelSymbols = MMI.AddrLabelSymbols;
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ExternalContext = MMI.ExternalContext;
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TheModule = MMI.TheModule;
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}
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MachineModuleInfo::MachineModuleInfo(const LLVMTargetMachine *TM)
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: TM(*TM), Context(TM->getTargetTriple(), TM->getMCAsmInfo(),
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TM->getMCRegisterInfo(), TM->getMCSubtargetInfo(),
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nullptr, nullptr, false) {
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Context.setObjectFileInfo(TM->getObjFileLowering());
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initialize();
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}
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MachineModuleInfo::MachineModuleInfo(const LLVMTargetMachine *TM,
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MCContext *ExtContext)
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: TM(*TM), Context(TM->getTargetTriple(), TM->getMCAsmInfo(),
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TM->getMCRegisterInfo(), TM->getMCSubtargetInfo(),
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nullptr, nullptr, false),
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ExternalContext(ExtContext) {
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Context.setObjectFileInfo(TM->getObjFileLowering());
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initialize();
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}
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MachineModuleInfo::~MachineModuleInfo() { finalize(); }
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//===- Address of Block Management ----------------------------------------===//
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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(getContext());
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return AddrLabelSymbols->getAddrLabelSymbolToEmit(const_cast<BasicBlock*>(BB));
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}
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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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/// \name Exception Handling
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/// \{
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void MachineModuleInfo::addPersonality(const Function *Personality) {
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if (!llvm::is_contained(Personalities, Personality))
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Personalities.push_back(Personality);
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}
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/// \}
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MachineFunction *
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MachineModuleInfo::getMachineFunction(const Function &F) const {
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auto I = MachineFunctions.find(&F);
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return I != MachineFunctions.end() ? I->second.get() : nullptr;
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}
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MachineFunction &MachineModuleInfo::getOrCreateMachineFunction(Function &F) {
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// Shortcut for the common case where a sequence of MachineFunctionPasses
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// all query for the same Function.
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if (LastRequest == &F)
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return *LastResult;
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auto I = MachineFunctions.insert(
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std::make_pair(&F, std::unique_ptr<MachineFunction>()));
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MachineFunction *MF;
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if (I.second) {
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// No pre-existing machine function, create a new one.
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const TargetSubtargetInfo &STI = *TM.getSubtargetImpl(F);
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MF = new MachineFunction(F, TM, STI, NextFnNum++, *this);
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// Update the set entry.
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I.first->second.reset(MF);
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} else {
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MF = I.first->second.get();
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}
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LastRequest = &F;
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LastResult = MF;
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return *MF;
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}
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void MachineModuleInfo::deleteMachineFunctionFor(Function &F) {
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MachineFunctions.erase(&F);
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LastRequest = nullptr;
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LastResult = nullptr;
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}
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namespace {
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/// This pass frees the MachineFunction object associated with a Function.
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class FreeMachineFunction : public FunctionPass {
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public:
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static char ID;
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FreeMachineFunction() : FunctionPass(ID) {}
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void getAnalysisUsage(AnalysisUsage &AU) const override {
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AU.addRequired<MachineModuleInfoWrapperPass>();
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AU.addPreserved<MachineModuleInfoWrapperPass>();
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}
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bool runOnFunction(Function &F) override {
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MachineModuleInfo &MMI =
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getAnalysis<MachineModuleInfoWrapperPass>().getMMI();
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MMI.deleteMachineFunctionFor(F);
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return true;
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}
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StringRef getPassName() const override {
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return "Free MachineFunction";
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}
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};
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} // end anonymous namespace
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char FreeMachineFunction::ID;
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FunctionPass *llvm::createFreeMachineFunctionPass() {
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return new FreeMachineFunction();
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}
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MachineModuleInfoWrapperPass::MachineModuleInfoWrapperPass(
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const LLVMTargetMachine *TM)
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: ImmutablePass(ID), MMI(TM) {
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initializeMachineModuleInfoWrapperPassPass(*PassRegistry::getPassRegistry());
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}
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MachineModuleInfoWrapperPass::MachineModuleInfoWrapperPass(
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const LLVMTargetMachine *TM, MCContext *ExtContext)
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: ImmutablePass(ID), MMI(TM, ExtContext) {
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initializeMachineModuleInfoWrapperPassPass(*PassRegistry::getPassRegistry());
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}
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// Handle the Pass registration stuff necessary to use DataLayout's.
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INITIALIZE_PASS(MachineModuleInfoWrapperPass, "machinemoduleinfo",
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"Machine Module Information", false, false)
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char MachineModuleInfoWrapperPass::ID = 0;
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static unsigned getLocCookie(const SMDiagnostic &SMD, const SourceMgr &SrcMgr,
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std::vector<const MDNode *> &LocInfos) {
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// Look up a LocInfo for the buffer this diagnostic is coming from.
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unsigned BufNum = SrcMgr.FindBufferContainingLoc(SMD.getLoc());
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const MDNode *LocInfo = nullptr;
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if (BufNum > 0 && BufNum <= LocInfos.size())
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LocInfo = LocInfos[BufNum - 1];
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// If the inline asm had metadata associated with it, pull out a location
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// cookie corresponding to which line the error occurred on.
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unsigned LocCookie = 0;
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if (LocInfo) {
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unsigned ErrorLine = SMD.getLineNo() - 1;
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if (ErrorLine >= LocInfo->getNumOperands())
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ErrorLine = 0;
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if (LocInfo->getNumOperands() != 0)
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if (const ConstantInt *CI =
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mdconst::dyn_extract<ConstantInt>(LocInfo->getOperand(ErrorLine)))
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LocCookie = CI->getZExtValue();
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}
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return LocCookie;
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}
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bool MachineModuleInfoWrapperPass::doInitialization(Module &M) {
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MMI.initialize();
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MMI.TheModule = &M;
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// FIXME: Do this for new pass manager.
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LLVMContext &Ctx = M.getContext();
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MMI.getContext().setDiagnosticHandler(
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[&Ctx](const SMDiagnostic &SMD, bool IsInlineAsm, const SourceMgr &SrcMgr,
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std::vector<const MDNode *> &LocInfos) {
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unsigned LocCookie = 0;
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if (IsInlineAsm)
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LocCookie = getLocCookie(SMD, SrcMgr, LocInfos);
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Ctx.diagnose(DiagnosticInfoSrcMgr(SMD, IsInlineAsm, LocCookie));
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});
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MMI.DbgInfoAvailable = !M.debug_compile_units().empty();
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return false;
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}
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bool MachineModuleInfoWrapperPass::doFinalization(Module &M) {
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MMI.finalize();
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return false;
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}
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AnalysisKey MachineModuleAnalysis::Key;
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MachineModuleInfo MachineModuleAnalysis::run(Module &M,
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ModuleAnalysisManager &) {
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MachineModuleInfo MMI(TM);
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MMI.TheModule = &M;
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MMI.DbgInfoAvailable = !M.debug_compile_units().empty();
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return MMI;
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}
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