Coverage Report

Created: 2018-09-25 17:16

/Users/buildslave/jenkins/workspace/clang-stage2-coverage-R/llvm/include/llvm/CodeGen/MachineModuleInfo.h
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//===-- llvm/CodeGen/MachineModuleInfo.h ------------------------*- 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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//
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// Collect meta information for a module.  This information should be in a
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// neutral form that can be used by different debugging and exception handling
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// schemes.
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//
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// The organization of information is primarily clustered around the source
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// compile units.  The main exception is source line correspondence where
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// inlining may interleave code from various compile units.
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//
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// The following information can be retrieved from the MachineModuleInfo.
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//
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//  -- Source directories - Directories are uniqued based on their canonical
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//     string and assigned a sequential numeric ID (base 1.)
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//  -- Source files - Files are also uniqued based on their name and directory
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//     ID.  A file ID is sequential number (base 1.)
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//  -- Source line correspondence - A vector of file ID, line#, column# triples.
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//     A DEBUG_LOCATION instruction is generated  by the DAG Legalizer
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//     corresponding to each entry in the source line list.  This allows a debug
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//     emitter to generate labels referenced by debug information tables.
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//
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//===----------------------------------------------------------------------===//
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#ifndef LLVM_CODEGEN_MACHINEMODULEINFO_H
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#define 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/PointerIntPair.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/Pass.h"
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#include <memory>
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#include <utility>
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#include <vector>
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namespace llvm {
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class BasicBlock;
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class CallInst;
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class Function;
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class MachineFunction;
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class MMIAddrLabelMap;
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class Module;
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class TargetMachine;
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//===----------------------------------------------------------------------===//
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/// This class can be derived from and used by targets to hold private
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/// target-specific information for each Module.  Objects of type are
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/// accessed/created with MMI::getInfo and destroyed when the MachineModuleInfo
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/// is destroyed.
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///
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class MachineModuleInfoImpl {
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public:
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  using StubValueTy = PointerIntPair<MCSymbol *, 1, bool>;
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  using SymbolListTy = std::vector<std::pair<MCSymbol *, StubValueTy>>;
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  virtual ~MachineModuleInfoImpl();
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protected:
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  /// Return the entries from a DenseMap in a deterministic sorted orer.
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  /// Clears the map.
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  static SymbolListTy getSortedStubs(DenseMap<MCSymbol*, StubValueTy>&);
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};
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//===----------------------------------------------------------------------===//
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/// This class contains meta information specific to a module.  Queries can be
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/// made by different debugging and exception handling schemes and reformated
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/// for specific use.
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///
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class MachineModuleInfo : public ImmutablePass {
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  const TargetMachine &TM;
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  /// This is the MCContext used for the entire code generator.
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  MCContext Context;
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  /// This is the LLVM Module being worked on.
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  const Module *TheModule;
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  /// This is the object-file-format-specific implementation of
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  /// MachineModuleInfoImpl, which lets targets accumulate whatever info they
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  /// want.
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  MachineModuleInfoImpl *ObjFileMMI;
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  /// \name Exception Handling
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  /// \{
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  /// Vector of all personality functions ever seen. Used to emit common EH
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  /// frames.
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  std::vector<const Function *> Personalities;
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  /// The current call site index being processed, if any. 0 if none.
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  unsigned CurCallSite;
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  /// \}
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  /// This map keeps track of which symbol is being used for the specified
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  /// basic block's address of label.
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  MMIAddrLabelMap *AddrLabelSymbols;
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  // TODO: Ideally, what we'd like is to have a switch that allows emitting
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  // synchronous (precise at call-sites only) CFA into .eh_frame. However,
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  // even under this switch, we'd like .debug_frame to be precise when using
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  // -g. At this moment, there's no way to specify that some CFI directives
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  // go into .eh_frame only, while others go into .debug_frame only.
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  /// True if debugging information is available in this module.
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  bool DbgInfoAvailable;
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  /// True if this module calls VarArg function with floating-point arguments.
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  /// This is used to emit an undefined reference to _fltused on Windows
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  /// targets.
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  bool UsesVAFloatArgument;
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  /// True if the module calls the __morestack function indirectly, as is
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  /// required under the large code model on x86. This is used to emit
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  /// a definition of a symbol, __morestack_addr, containing the address. See
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  /// comments in lib/Target/X86/X86FrameLowering.cpp for more details.
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  bool UsesMorestackAddr;
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  /// True if the module contains split-stack functions. This is used to
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  /// emit .note.GNU-split-stack section as required by the linker for
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  /// special handling split-stack function calling no-split-stack function.
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  bool HasSplitStack;
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  /// True if the module contains no-split-stack functions. This is used to
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  /// emit .note.GNU-no-split-stack section when it also contains split-stack
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  /// functions.
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  bool HasNosplitStack;
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  /// Maps IR Functions to their corresponding MachineFunctions.
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  DenseMap<const Function*, std::unique_ptr<MachineFunction>> MachineFunctions;
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  /// Next unique number available for a MachineFunction.
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  unsigned NextFnNum = 0;
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  const Function *LastRequest = nullptr; ///< Used for shortcut/cache.
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  MachineFunction *LastResult = nullptr; ///< Used for shortcut/cache.
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public:
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  static char ID; // Pass identification, replacement for typeid
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  explicit MachineModuleInfo(const TargetMachine *TM = nullptr);
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  ~MachineModuleInfo() override;
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  // Initialization and Finalization
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  bool doInitialization(Module &) override;
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  bool doFinalization(Module &) override;
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  const MCContext &getContext() const { return Context; }
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  MCContext &getContext() { return Context; }
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  const Module *getModule() const { return TheModule; }
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  /// Returns the MachineFunction constructed for the IR function \p F.
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  /// Creates a new MachineFunction if none exists yet.
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  MachineFunction &getOrCreateMachineFunction(const Function &F);
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  /// \bried Returns the MachineFunction associated to IR function \p F if there
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  /// is one, otherwise nullptr.
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  MachineFunction *getMachineFunction(const Function &F) const;
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  /// Delete the MachineFunction \p MF and reset the link in the IR Function to
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  /// Machine Function map.
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  void deleteMachineFunctionFor(Function &F);
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  /// Keep track of various per-function pieces of information for backends
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  /// that would like to do so.
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  template<typename Ty>
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  Ty &getObjFileInfo() {
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    if (ObjFileMMI == nullptr)
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      ObjFileMMI = new Ty(*this);
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    return *static_cast<Ty*>(ObjFileMMI);
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  }
llvm::MachineModuleInfoCOFF& llvm::MachineModuleInfo::getObjFileInfo<llvm::MachineModuleInfoCOFF>()
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  Ty &getObjFileInfo() {
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    if (ObjFileMMI == nullptr)
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      ObjFileMMI = new Ty(*this);
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    return *static_cast<Ty*>(ObjFileMMI);
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  }
llvm::AMDGPUMachineModuleInfo& llvm::MachineModuleInfo::getObjFileInfo<llvm::AMDGPUMachineModuleInfo>()
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  Ty &getObjFileInfo() {
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    if (ObjFileMMI == nullptr)
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      ObjFileMMI = new Ty(*this);
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    return *static_cast<Ty*>(ObjFileMMI);
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  }
llvm::MachineModuleInfoMachO& llvm::MachineModuleInfo::getObjFileInfo<llvm::MachineModuleInfoMachO>()
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  Ty &getObjFileInfo() {
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    if (ObjFileMMI == nullptr)
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      ObjFileMMI = new Ty(*this);
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    return *static_cast<Ty*>(ObjFileMMI);
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  }
llvm::MachineModuleInfoELF& llvm::MachineModuleInfo::getObjFileInfo<llvm::MachineModuleInfoELF>()
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  Ty &getObjFileInfo() {
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    if (ObjFileMMI == nullptr)
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      ObjFileMMI = new Ty(*this);
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    return *static_cast<Ty*>(ObjFileMMI);
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  }
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  template<typename Ty>
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  const Ty &getObjFileInfo() const {
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    return const_cast<MachineModuleInfo*>(this)->getObjFileInfo<Ty>();
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  }
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  /// Returns true if valid debug info is present.
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  bool hasDebugInfo() const { return DbgInfoAvailable; }
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  void setDebugInfoAvailability(bool avail) { DbgInfoAvailable = avail; }
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  bool usesVAFloatArgument() const {
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    return UsesVAFloatArgument;
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  }
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  void setUsesVAFloatArgument(bool b) {
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    UsesVAFloatArgument = b;
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  }
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  bool usesMorestackAddr() const {
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    return UsesMorestackAddr;
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  }
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  void setUsesMorestackAddr(bool b) {
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    UsesMorestackAddr = b;
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  }
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  bool hasSplitStack() const {
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    return HasSplitStack;
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  }
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  void setHasSplitStack(bool b) {
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    HasSplitStack = b;
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  }
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  bool hasNosplitStack() const {
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    return HasNosplitStack;
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  }
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  void setHasNosplitStack(bool b) {
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    HasNosplitStack = b;
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  }
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  /// Return the symbol to be used for the specified basic block when its
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  /// address is taken.  This cannot be its normal LBB label because the block
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  /// may be accessed outside its containing function.
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  MCSymbol *getAddrLabelSymbol(const BasicBlock *BB) {
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    return getAddrLabelSymbolToEmit(BB).front();
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  }
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  /// Return the symbol to be used for the specified basic block when its
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  /// address is taken.  If other blocks were RAUW'd to this one, we may have
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  /// to emit them as well, return the whole set.
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  ArrayRef<MCSymbol *> getAddrLabelSymbolToEmit(const BasicBlock *BB);
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  /// If the specified function has had any references to address-taken blocks
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  /// generated, but the block got deleted, return the symbol now so we can
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  /// emit it.  This prevents emitting a reference to a symbol that has no
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  /// definition.
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  void takeDeletedSymbolsForFunction(const Function *F,
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                                     std::vector<MCSymbol*> &Result);
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  /// \name Exception Handling
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  /// \{
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  /// Set the call site currently being processed.
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  void setCurrentCallSite(unsigned Site) { CurCallSite = Site; }
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  /// Get the call site currently being processed, if any.  return zero if
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  /// none.
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  unsigned getCurrentCallSite() { return CurCallSite; }
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  /// Provide the personality function for the exception information.
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  void addPersonality(const Function *Personality);
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  /// Return array of personality functions ever seen.
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  const std::vector<const Function *>& getPersonalities() const {
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    return Personalities;
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  }
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  /// \}
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}; // End class MachineModuleInfo
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//===- MMI building helpers -----------------------------------------------===//
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/// Determine if any floating-point values are being passed to this variadic
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/// function, and set the MachineModuleInfo's usesVAFloatArgument flag if so.
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/// This flag is used to emit an undefined reference to _fltused on Windows,
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/// which will link in MSVCRT's floating-point support.
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void computeUsesVAFloatArgument(const CallInst &I, MachineModuleInfo &MMI);
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} // end namespace llvm
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#endif // LLVM_CODEGEN_MACHINEMODULEINFO_H