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//===-- 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/CallingConvLower.h"
#include "llvm/CodeGen/SelectionDAGNodes.h"
//
// Need to handle varargs.
//
namespace llvm {
class TargetRegisterInfo;
class TargetMachine;
class Hexagon_CCState;
class SDNode;
struct EVT;
/// 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;
SmallVectorImpl<CCValAssign> &Locs;
LLVMContext &Context;
unsigned StackOffset;
SmallVector<uint32_t, 16> UsedRegs;
public:
Hexagon_CCState(CallingConv::ID CC, bool isVarArg, const TargetMachine &TM,
SmallVectorImpl<CCValAssign> &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
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