| //===-- llvm/CodeGen/MachineModuleInfo.h ------------------------*- C++ -*-===// |
| // |
| // Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions. |
| // See https://llvm.org/LICENSE.txt for license information. |
| // SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception |
| // |
| //===----------------------------------------------------------------------===// |
| // |
| // Collect meta information for a module. This information should be in a |
| // neutral form that can be used by different debugging and exception handling |
| // schemes. |
| // |
| // The organization of information is primarily clustered around the source |
| // compile units. The main exception is source line correspondence where |
| // inlining may interleave code from various compile units. |
| // |
| // The following information can be retrieved from the MachineModuleInfo. |
| // |
| // -- Source directories - Directories are uniqued based on their canonical |
| // string and assigned a sequential numeric ID (base 1.) |
| // -- Source files - Files are also uniqued based on their name and directory |
| // ID. A file ID is sequential number (base 1.) |
| // -- Source line correspondence - A vector of file ID, line#, column# triples. |
| // A DEBUG_LOCATION instruction is generated by the DAG Legalizer |
| // corresponding to each entry in the source line list. This allows a debug |
| // emitter to generate labels referenced by debug information tables. |
| // |
| //===----------------------------------------------------------------------===// |
| |
| #ifndef LLVM_CODEGEN_MACHINEMODULEINFO_H |
| #define LLVM_CODEGEN_MACHINEMODULEINFO_H |
| |
| #include "llvm/ADT/ArrayRef.h" |
| #include "llvm/ADT/DenseMap.h" |
| #include "llvm/ADT/PointerIntPair.h" |
| #include "llvm/MC/MCContext.h" |
| #include "llvm/MC/MCSymbol.h" |
| #include "llvm/Pass.h" |
| #include <memory> |
| #include <utility> |
| #include <vector> |
| |
| namespace llvm { |
| |
| class BasicBlock; |
| class CallInst; |
| class Function; |
| class LLVMTargetMachine; |
| class MMIAddrLabelMap; |
| class MachineFunction; |
| class Module; |
| |
| //===----------------------------------------------------------------------===// |
| /// This class can be derived from and used by targets to hold private |
| /// target-specific information for each Module. Objects of type are |
| /// accessed/created with MMI::getInfo and destroyed when the MachineModuleInfo |
| /// is destroyed. |
| /// |
| class MachineModuleInfoImpl { |
| public: |
| using StubValueTy = PointerIntPair<MCSymbol *, 1, bool>; |
| using SymbolListTy = std::vector<std::pair<MCSymbol *, StubValueTy>>; |
| |
| virtual ~MachineModuleInfoImpl(); |
| |
| protected: |
| /// Return the entries from a DenseMap in a deterministic sorted orer. |
| /// Clears the map. |
| static SymbolListTy getSortedStubs(DenseMap<MCSymbol*, StubValueTy>&); |
| }; |
| |
| //===----------------------------------------------------------------------===// |
| /// This class contains meta information specific to a module. Queries can be |
| /// made by different debugging and exception handling schemes and reformated |
| /// for specific use. |
| /// |
| class MachineModuleInfo : public ImmutablePass { |
| const LLVMTargetMachine &TM; |
| |
| /// This is the MCContext used for the entire code generator. |
| MCContext Context; |
| |
| /// This is the LLVM Module being worked on. |
| const Module *TheModule; |
| |
| /// This is the object-file-format-specific implementation of |
| /// MachineModuleInfoImpl, which lets targets accumulate whatever info they |
| /// want. |
| MachineModuleInfoImpl *ObjFileMMI; |
| |
| /// \name Exception Handling |
| /// \{ |
| |
| /// Vector of all personality functions ever seen. Used to emit common EH |
| /// frames. |
| std::vector<const Function *> Personalities; |
| |
| /// The current call site index being processed, if any. 0 if none. |
| unsigned CurCallSite; |
| |
| /// \} |
| |
| /// This map keeps track of which symbol is being used for the specified |
| /// basic block's address of label. |
| MMIAddrLabelMap *AddrLabelSymbols; |
| |
| // TODO: Ideally, what we'd like is to have a switch that allows emitting |
| // synchronous (precise at call-sites only) CFA into .eh_frame. However, |
| // even under this switch, we'd like .debug_frame to be precise when using |
| // -g. At this moment, there's no way to specify that some CFI directives |
| // go into .eh_frame only, while others go into .debug_frame only. |
| |
| /// True if debugging information is available in this module. |
| bool DbgInfoAvailable; |
| |
| /// True if this module is being built for windows/msvc, and uses floating |
| /// point. This is used to emit an undefined reference to _fltused. |
| bool UsesMSVCFloatingPoint; |
| |
| /// True if the module calls the __morestack function indirectly, as is |
| /// required under the large code model on x86. This is used to emit |
| /// a definition of a symbol, __morestack_addr, containing the address. See |
| /// comments in lib/Target/X86/X86FrameLowering.cpp for more details. |
| bool UsesMorestackAddr; |
| |
| /// True if the module contains split-stack functions. This is used to |
| /// emit .note.GNU-split-stack section as required by the linker for |
| /// special handling split-stack function calling no-split-stack function. |
| bool HasSplitStack; |
| |
| /// True if the module contains no-split-stack functions. This is used to |
| /// emit .note.GNU-no-split-stack section when it also contains split-stack |
| /// functions. |
| bool HasNosplitStack; |
| |
| /// Maps IR Functions to their corresponding MachineFunctions. |
| DenseMap<const Function*, std::unique_ptr<MachineFunction>> MachineFunctions; |
| /// Next unique number available for a MachineFunction. |
| unsigned NextFnNum = 0; |
| const Function *LastRequest = nullptr; ///< Used for shortcut/cache. |
| MachineFunction *LastResult = nullptr; ///< Used for shortcut/cache. |
| |
| public: |
| static char ID; // Pass identification, replacement for typeid |
| |
| explicit MachineModuleInfo(const LLVMTargetMachine *TM = nullptr); |
| ~MachineModuleInfo() override; |
| |
| // Initialization and Finalization |
| bool doInitialization(Module &) override; |
| bool doFinalization(Module &) override; |
| |
| const MCContext &getContext() const { return Context; } |
| MCContext &getContext() { return Context; } |
| |
| const Module *getModule() const { return TheModule; } |
| |
| /// Returns the MachineFunction constructed for the IR function \p F. |
| /// Creates a new MachineFunction if none exists yet. |
| MachineFunction &getOrCreateMachineFunction(const Function &F); |
| |
| /// \bried Returns the MachineFunction associated to IR function \p F if there |
| /// is one, otherwise nullptr. |
| MachineFunction *getMachineFunction(const Function &F) const; |
| |
| /// Delete the MachineFunction \p MF and reset the link in the IR Function to |
| /// Machine Function map. |
| void deleteMachineFunctionFor(Function &F); |
| |
| /// Keep track of various per-function pieces of information for backends |
| /// that would like to do so. |
| template<typename Ty> |
| Ty &getObjFileInfo() { |
| if (ObjFileMMI == nullptr) |
| ObjFileMMI = new Ty(*this); |
| return *static_cast<Ty*>(ObjFileMMI); |
| } |
| |
| template<typename Ty> |
| const Ty &getObjFileInfo() const { |
| return const_cast<MachineModuleInfo*>(this)->getObjFileInfo<Ty>(); |
| } |
| |
| /// Returns true if valid debug info is present. |
| bool hasDebugInfo() const { return DbgInfoAvailable; } |
| void setDebugInfoAvailability(bool avail) { DbgInfoAvailable = avail; } |
| |
| bool usesMSVCFloatingPoint() const { return UsesMSVCFloatingPoint; } |
| |
| void setUsesMSVCFloatingPoint(bool b) { UsesMSVCFloatingPoint = b; } |
| |
| bool usesMorestackAddr() const { |
| return UsesMorestackAddr; |
| } |
| |
| void setUsesMorestackAddr(bool b) { |
| UsesMorestackAddr = b; |
| } |
| |
| bool hasSplitStack() const { |
| return HasSplitStack; |
| } |
| |
| void setHasSplitStack(bool b) { |
| HasSplitStack = b; |
| } |
| |
| bool hasNosplitStack() const { |
| return HasNosplitStack; |
| } |
| |
| void setHasNosplitStack(bool b) { |
| HasNosplitStack = b; |
| } |
| |
| /// Return the symbol to be used for the specified basic block when its |
| /// address is taken. This cannot be its normal LBB label because the block |
| /// may be accessed outside its containing function. |
| MCSymbol *getAddrLabelSymbol(const BasicBlock *BB) { |
| return getAddrLabelSymbolToEmit(BB).front(); |
| } |
| |
| /// Return the symbol to be used for the specified basic block when its |
| /// address is taken. If other blocks were RAUW'd to this one, we may have |
| /// to emit them as well, return the whole set. |
| ArrayRef<MCSymbol *> getAddrLabelSymbolToEmit(const BasicBlock *BB); |
| |
| /// If the specified function has had any references to address-taken blocks |
| /// generated, but the block got deleted, return the symbol now so we can |
| /// emit it. This prevents emitting a reference to a symbol that has no |
| /// definition. |
| void takeDeletedSymbolsForFunction(const Function *F, |
| std::vector<MCSymbol*> &Result); |
| |
| /// \name Exception Handling |
| /// \{ |
| |
| /// Set the call site currently being processed. |
| void setCurrentCallSite(unsigned Site) { CurCallSite = Site; } |
| |
| /// Get the call site currently being processed, if any. return zero if |
| /// none. |
| unsigned getCurrentCallSite() { return CurCallSite; } |
| |
| /// Provide the personality function for the exception information. |
| void addPersonality(const Function *Personality); |
| |
| /// Return array of personality functions ever seen. |
| const std::vector<const Function *>& getPersonalities() const { |
| return Personalities; |
| } |
| /// \} |
| }; // End class MachineModuleInfo |
| |
| } // end namespace llvm |
| |
| #endif // LLVM_CODEGEN_MACHINEMODULEINFO_H |