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1) Fix a specific bug when certain conversion functions are called in a program compiled as mips16 with hard float and the program is linked as c++. There are two libraries that are reversed in the link order with gcc/g++ and clang/clang++ for mips16 in this case and the proper stubs will then not be called. These stubs are normally handled in the Mips16HardFloat pass but in this case we don't know at that time that we need to generate the stubs. This must all be handled later in code generation and we have moved this functionality to MipsAsmPrinter. When linked as C (gcc or clang) the proper stubs are linked in from libc. 2) Set up the infrastructure to handle 90% of what is in the Mips16HardFloat pass in this new area of MipsAsmPrinter. This is a more logical place to handle this and we have known for some time that we needed to move the code later and not implement it using inline asm as we do now but it was not clear exactly where to do this and what mechanism should be used. Now it's clear to us how to do this and this patch contains the infrastructure to move most of this to MipsAsmPrinter but the actual moving will be done in a follow on patch. The same infrastructure is used to fix this current bug as described in #1. This change was requested by the list during the original putback of the Mips16HardFloat pass but was not practical for us do at that time. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@201426 91177308-0d34-0410-b5e6-96231b3b80d8
148 lines
4.7 KiB
C++
148 lines
4.7 KiB
C++
//===-- MipsMachineFunctionInfo.h - Private data used for Mips ----*- 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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// This file declares the Mips specific subclass of MachineFunctionInfo.
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//
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//===----------------------------------------------------------------------===//
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#ifndef MIPS_MACHINE_FUNCTION_INFO_H
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#define MIPS_MACHINE_FUNCTION_INFO_H
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#include "Mips16HardFloatInfo.h"
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#include "MipsSubtarget.h"
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#include "llvm/ADT/StringMap.h"
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#include "llvm/ADT/ValueMap.h"
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#include "llvm/CodeGen/MachineFrameInfo.h"
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#include "llvm/CodeGen/MachineFunction.h"
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#include "llvm/CodeGen/MachineMemOperand.h"
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#include "llvm/CodeGen/PseudoSourceValue.h"
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#include "llvm/IR/GlobalValue.h"
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#include "llvm/Target/TargetFrameLowering.h"
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#include "llvm/Target/TargetMachine.h"
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#include <map>
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#include <string>
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#include <utility>
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namespace llvm {
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/// \brief A class derived from PseudoSourceValue that represents a GOT entry
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/// resolved by lazy-binding.
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class MipsCallEntry : public PseudoSourceValue {
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public:
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explicit MipsCallEntry(const StringRef &N);
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explicit MipsCallEntry(const GlobalValue *V);
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virtual bool isConstant(const MachineFrameInfo *) const;
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virtual bool isAliased(const MachineFrameInfo *) const;
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virtual bool mayAlias(const MachineFrameInfo *) const;
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private:
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virtual void printCustom(raw_ostream &O) const;
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#ifndef NDEBUG
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std::string Name;
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const GlobalValue *Val;
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#endif
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};
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/// MipsFunctionInfo - This class is derived from MachineFunction private
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/// Mips target-specific information for each MachineFunction.
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class MipsFunctionInfo : public MachineFunctionInfo {
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public:
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MipsFunctionInfo(MachineFunction &MF)
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: MF(MF), SRetReturnReg(0), GlobalBaseReg(0), Mips16SPAliasReg(0),
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VarArgsFrameIndex(0), CallsEhReturn(false), SaveS2(false) {}
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~MipsFunctionInfo();
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unsigned getSRetReturnReg() const { return SRetReturnReg; }
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void setSRetReturnReg(unsigned Reg) { SRetReturnReg = Reg; }
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bool globalBaseRegSet() const;
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unsigned getGlobalBaseReg();
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bool mips16SPAliasRegSet() const;
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unsigned getMips16SPAliasReg();
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int getVarArgsFrameIndex() const { return VarArgsFrameIndex; }
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void setVarArgsFrameIndex(int Index) { VarArgsFrameIndex = Index; }
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bool hasByvalArg() const { return HasByvalArg; }
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void setFormalArgInfo(unsigned Size, bool HasByval) {
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IncomingArgSize = Size;
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HasByvalArg = HasByval;
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}
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unsigned getIncomingArgSize() const { return IncomingArgSize; }
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bool callsEhReturn() const { return CallsEhReturn; }
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void setCallsEhReturn() { CallsEhReturn = true; }
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void createEhDataRegsFI();
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int getEhDataRegFI(unsigned Reg) const { return EhDataRegFI[Reg]; }
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bool isEhDataRegFI(int FI) const;
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/// \brief Create a MachinePointerInfo that has a MipsCallEntr object
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/// representing a GOT entry for an external function.
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MachinePointerInfo callPtrInfo(const StringRef &Name);
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/// \brief Create a MachinePointerInfo that has a MipsCallEntr object
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/// representing a GOT entry for a global function.
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MachinePointerInfo callPtrInfo(const GlobalValue *Val);
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void setSaveS2() { SaveS2 = true; }
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bool hasSaveS2() const { return SaveS2; }
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std::map<const char *, const llvm::Mips16HardFloatInfo::FuncSignature *>
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StubsNeeded;
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private:
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virtual void anchor();
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MachineFunction& MF;
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/// SRetReturnReg - Some subtargets require that sret lowering includes
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/// returning the value of the returned struct in a register. This field
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/// holds the virtual register into which the sret argument is passed.
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unsigned SRetReturnReg;
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/// GlobalBaseReg - keeps track of the virtual register initialized for
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/// use as the global base register. This is used for PIC in some PIC
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/// relocation models.
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unsigned GlobalBaseReg;
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/// Mips16SPAliasReg - keeps track of the virtual register initialized for
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/// use as an alias for SP for use in load/store of halfword/byte from/to
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/// the stack
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unsigned Mips16SPAliasReg;
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/// VarArgsFrameIndex - FrameIndex for start of varargs area.
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int VarArgsFrameIndex;
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/// True if function has a byval argument.
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bool HasByvalArg;
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/// Size of incoming argument area.
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unsigned IncomingArgSize;
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/// CallsEhReturn - Whether the function calls llvm.eh.return.
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bool CallsEhReturn;
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/// Frame objects for spilling eh data registers.
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int EhDataRegFI[4];
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// saveS2
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bool SaveS2;
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/// MipsCallEntry maps.
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StringMap<const MipsCallEntry *> ExternalCallEntries;
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ValueMap<const GlobalValue *, const MipsCallEntry *> GlobalCallEntries;
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};
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} // end of namespace llvm
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#endif // MIPS_MACHINE_FUNCTION_INFO_H
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