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Diffstat (limited to 'lib/Target/Hexagon/HexagonCallingConvLower.h')
| -rw-r--r-- | lib/Target/Hexagon/HexagonCallingConvLower.h | 189 |
1 files changed, 189 insertions, 0 deletions
diff --git a/lib/Target/Hexagon/HexagonCallingConvLower.h b/lib/Target/Hexagon/HexagonCallingConvLower.h new file mode 100644 index 0000000000..1f601e87ad --- /dev/null +++ b/lib/Target/Hexagon/HexagonCallingConvLower.h @@ -0,0 +1,189 @@ +//===-- HexagonCallingConvLower.h - Calling Conventions ---------*- C++ -*-===// +// +// The LLVM Compiler Infrastructure +// +// This file is distributed under the University of Illinois Open Source +// License. See LICENSE.TXT for details. +// +//===----------------------------------------------------------------------===// +// +// This file declares the Hexagon_CCState class, used for lowering +// and implementing calling conventions. Adapted from the target independent +// version but this handles calls to varargs functions +// +//===----------------------------------------------------------------------===// + +#ifndef LLVM_Hexagon_CODEGEN_CALLINGCONVLOWER_H +#define LLVM_Hexagon_CODEGEN_CALLINGCONVLOWER_H + +#include "llvm/ADT/SmallVector.h" +#include "llvm/CodeGen/ValueTypes.h" +#include "llvm/CodeGen/SelectionDAGNodes.h" +#include "llvm/CodeGen/CallingConvLower.h" + +// +// Need to handle varargs. +// +namespace llvm { + class TargetRegisterInfo; + class TargetMachine; + class Hexagon_CCState; + class SDNode; + + +/// Hexagon_CCAssignFn - This function assigns a location for Val, updating +/// State to reflect the change. +typedef bool Hexagon_CCAssignFn(unsigned ValNo, EVT ValVT, + EVT LocVT, CCValAssign::LocInfo LocInfo, + ISD::ArgFlagsTy ArgFlags, Hexagon_CCState &State, + int NonVarArgsParams, + int CurrentParam, + bool ForceMem); + + +/// CCState - This class holds information needed while lowering arguments and +/// return values. It captures which registers are already assigned and which +/// stack slots are used. It provides accessors to allocate these values. +class Hexagon_CCState { + CallingConv::ID CallingConv; + bool IsVarArg; + const TargetMachine &TM; + const TargetRegisterInfo &TRI; + SmallVector<CCValAssign, 16> &Locs; + LLVMContext &Context; + + unsigned StackOffset; + SmallVector<uint32_t, 16> UsedRegs; +public: + Hexagon_CCState(CallingConv::ID CC, bool isVarArg, const TargetMachine &TM, + SmallVector<CCValAssign, 16> &locs, LLVMContext &c); + + void addLoc(const CCValAssign &V) { + Locs.push_back(V); + } + + LLVMContext &getContext() const { return Context; } + const TargetMachine &getTarget() const { return TM; } + unsigned getCallingConv() const { return CallingConv; } + bool isVarArg() const { return IsVarArg; } + + unsigned getNextStackOffset() const { return StackOffset; } + + /// isAllocated - Return true if the specified register (or an alias) is + /// allocated. + bool isAllocated(unsigned Reg) const { + return UsedRegs[Reg/32] & (1 << (Reg&31)); + } + + /// AnalyzeFormalArguments - Analyze an ISD::FORMAL_ARGUMENTS node, + /// incorporating info about the formals into this state. + void AnalyzeFormalArguments(const SmallVectorImpl<ISD::InputArg> &Ins, + Hexagon_CCAssignFn Fn, unsigned SretValueInRegs); + + /// AnalyzeReturn - Analyze the returned values of an ISD::RET node, + /// incorporating info about the result values into this state. + void AnalyzeReturn(const SmallVectorImpl<ISD::OutputArg> &Outs, + Hexagon_CCAssignFn Fn, unsigned SretValueInRegs); + + /// AnalyzeCallOperands - Analyze an ISD::CALL node, incorporating info + /// about the passed values into this state. + void AnalyzeCallOperands(const SmallVectorImpl<ISD::OutputArg> &Outs, + Hexagon_CCAssignFn Fn, int NonVarArgsParams, + unsigned SretValueSize); + + /// AnalyzeCallOperands - Same as above except it takes vectors of types + /// and argument flags. + void AnalyzeCallOperands(SmallVectorImpl<EVT> &ArgVTs, + SmallVectorImpl<ISD::ArgFlagsTy> &Flags, + Hexagon_CCAssignFn Fn); + + /// AnalyzeCallResult - Analyze the return values of an ISD::CALL node, + /// incorporating info about the passed values into this state. + void AnalyzeCallResult(const SmallVectorImpl<ISD::InputArg> &Ins, + Hexagon_CCAssignFn Fn, unsigned SretValueInRegs); + + /// AnalyzeCallResult - Same as above except it's specialized for calls which + /// produce a single value. + void AnalyzeCallResult(EVT VT, Hexagon_CCAssignFn Fn); + + /// getFirstUnallocated - Return the first unallocated register in the set, or + /// NumRegs if they are all allocated. + unsigned getFirstUnallocated(const unsigned *Regs, unsigned NumRegs) const { + for (unsigned i = 0; i != NumRegs; ++i) + if (!isAllocated(Regs[i])) + return i; + return NumRegs; + } + + /// AllocateReg - Attempt to allocate one register. If it is not available, + /// return zero. Otherwise, return the register, marking it and any aliases + /// as allocated. + unsigned AllocateReg(unsigned Reg) { + if (isAllocated(Reg)) return 0; + MarkAllocated(Reg); + return Reg; + } + + /// Version of AllocateReg with extra register to be shadowed. + unsigned AllocateReg(unsigned Reg, unsigned ShadowReg) { + if (isAllocated(Reg)) return 0; + MarkAllocated(Reg); + MarkAllocated(ShadowReg); + return Reg; + } + + /// AllocateReg - Attempt to allocate one of the specified registers. If none + /// are available, return zero. Otherwise, return the first one available, + /// marking it and any aliases as allocated. + unsigned AllocateReg(const unsigned *Regs, unsigned NumRegs) { + unsigned FirstUnalloc = getFirstUnallocated(Regs, NumRegs); + if (FirstUnalloc == NumRegs) + return 0; // Didn't find the reg. + + // Mark the register and any aliases as allocated. + unsigned Reg = Regs[FirstUnalloc]; + MarkAllocated(Reg); + return Reg; + } + + /// Version of AllocateReg with list of registers to be shadowed. + unsigned AllocateReg(const unsigned *Regs, const unsigned *ShadowRegs, + unsigned NumRegs) { + unsigned FirstUnalloc = getFirstUnallocated(Regs, NumRegs); + if (FirstUnalloc == NumRegs) + return 0; // Didn't find the reg. + + // Mark the register and any aliases as allocated. + unsigned Reg = Regs[FirstUnalloc], ShadowReg = ShadowRegs[FirstUnalloc]; + MarkAllocated(Reg); + MarkAllocated(ShadowReg); + return Reg; + } + + /// AllocateStack - Allocate a chunk of stack space with the specified size + /// and alignment. + unsigned AllocateStack(unsigned Size, unsigned Align) { + assert(Align && ((Align-1) & Align) == 0); // Align is power of 2. + StackOffset = ((StackOffset + Align-1) & ~(Align-1)); + unsigned Result = StackOffset; + StackOffset += Size; + return Result; + } + + // HandleByVal - Allocate a stack slot large enough to pass an argument by + // value. The size and alignment information of the argument is encoded in its + // parameter attribute. + void HandleByVal(unsigned ValNo, EVT ValVT, + EVT LocVT, CCValAssign::LocInfo LocInfo, + int MinSize, int MinAlign, ISD::ArgFlagsTy ArgFlags); + +private: + /// MarkAllocated - Mark a register and all of its aliases as allocated. + void MarkAllocated(unsigned Reg); +}; + + + +} // end namespace llvm + +#endif |