CallingConvLower.h [plain text]
#ifndef LLVM_CODEGEN_CALLINGCONVLOWER_H
#define LLVM_CODEGEN_CALLINGCONVLOWER_H
#include "llvm/ADT/SmallVector.h"
#include "llvm/CodeGen/MachineFunction.h"
#include "llvm/CodeGen/MachineFrameInfo.h"
#include "llvm/CodeGen/ValueTypes.h"
#include "llvm/Target/TargetCallingConv.h"
#include "llvm/CallingConv.h"
namespace llvm {
class TargetRegisterInfo;
class TargetMachine;
class CCState;
class CCValAssign {
public:
enum LocInfo {
Full, SExt, ZExt, AExt, BCvt, VExt, Indirect };
private:
unsigned ValNo;
unsigned Loc;
bool isMem : 1;
bool isCustom : 1;
LocInfo HTP : 6;
MVT ValVT;
MVT LocVT;
public:
static CCValAssign getReg(unsigned ValNo, MVT ValVT,
unsigned RegNo, MVT LocVT,
LocInfo HTP) {
CCValAssign Ret;
Ret.ValNo = ValNo;
Ret.Loc = RegNo;
Ret.isMem = false;
Ret.isCustom = false;
Ret.HTP = HTP;
Ret.ValVT = ValVT;
Ret.LocVT = LocVT;
return Ret;
}
static CCValAssign getCustomReg(unsigned ValNo, MVT ValVT,
unsigned RegNo, MVT LocVT,
LocInfo HTP) {
CCValAssign Ret;
Ret = getReg(ValNo, ValVT, RegNo, LocVT, HTP);
Ret.isCustom = true;
return Ret;
}
static CCValAssign getMem(unsigned ValNo, MVT ValVT,
unsigned Offset, MVT LocVT,
LocInfo HTP) {
CCValAssign Ret;
Ret.ValNo = ValNo;
Ret.Loc = Offset;
Ret.isMem = true;
Ret.isCustom = false;
Ret.HTP = HTP;
Ret.ValVT = ValVT;
Ret.LocVT = LocVT;
return Ret;
}
static CCValAssign getCustomMem(unsigned ValNo, MVT ValVT,
unsigned Offset, MVT LocVT,
LocInfo HTP) {
CCValAssign Ret;
Ret = getMem(ValNo, ValVT, Offset, LocVT, HTP);
Ret.isCustom = true;
return Ret;
}
unsigned getValNo() const { return ValNo; }
MVT getValVT() const { return ValVT; }
bool isRegLoc() const { return !isMem; }
bool isMemLoc() const { return isMem; }
bool needsCustom() const { return isCustom; }
unsigned getLocReg() const { assert(isRegLoc()); return Loc; }
unsigned getLocMemOffset() const { assert(isMemLoc()); return Loc; }
MVT getLocVT() const { return LocVT; }
LocInfo getLocInfo() const { return HTP; }
bool isExtInLoc() const {
return (HTP == AExt || HTP == SExt || HTP == ZExt);
}
};
typedef bool CCAssignFn(unsigned ValNo, MVT ValVT,
MVT LocVT, CCValAssign::LocInfo LocInfo,
ISD::ArgFlagsTy ArgFlags, CCState &State);
typedef bool CCCustomFn(unsigned &ValNo, MVT &ValVT,
MVT &LocVT, CCValAssign::LocInfo &LocInfo,
ISD::ArgFlagsTy &ArgFlags, CCState &State);
typedef enum { Unknown, Prologue, Call } ParmContext;
class CCState {
private:
CallingConv::ID CallingConv;
bool IsVarArg;
MachineFunction &MF;
const TargetMachine &TM;
const TargetRegisterInfo &TRI;
SmallVector<CCValAssign, 16> &Locs;
LLVMContext &Context;
unsigned StackOffset;
SmallVector<uint32_t, 16> UsedRegs;
unsigned FirstByValReg;
bool FirstByValRegValid;
protected:
ParmContext CallOrPrologue;
public:
CCState(CallingConv::ID CC, bool isVarArg, MachineFunction &MF,
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; }
MachineFunction &getMachineFunction() const { return MF; }
CallingConv::ID getCallingConv() const { return CallingConv; }
bool isVarArg() const { return IsVarArg; }
unsigned getNextStackOffset() const { return StackOffset; }
bool isAllocated(unsigned Reg) const {
return UsedRegs[Reg/32] & (1 << (Reg&31));
}
void AnalyzeFormalArguments(const SmallVectorImpl<ISD::InputArg> &Ins,
CCAssignFn Fn);
void AnalyzeReturn(const SmallVectorImpl<ISD::OutputArg> &Outs,
CCAssignFn Fn);
bool CheckReturn(const SmallVectorImpl<ISD::OutputArg> &ArgsFlags,
CCAssignFn Fn);
void AnalyzeCallOperands(const SmallVectorImpl<ISD::OutputArg> &Outs,
CCAssignFn Fn);
void AnalyzeCallOperands(SmallVectorImpl<MVT> &ArgVTs,
SmallVectorImpl<ISD::ArgFlagsTy> &Flags,
CCAssignFn Fn);
void AnalyzeCallResult(const SmallVectorImpl<ISD::InputArg> &Ins,
CCAssignFn Fn);
void AnalyzeCallResult(MVT VT, CCAssignFn Fn);
unsigned getFirstUnallocated(const uint16_t *Regs, unsigned NumRegs) const {
for (unsigned i = 0; i != NumRegs; ++i)
if (!isAllocated(Regs[i]))
return i;
return NumRegs;
}
unsigned AllocateReg(unsigned Reg) {
if (isAllocated(Reg)) return 0;
MarkAllocated(Reg);
return Reg;
}
unsigned AllocateReg(unsigned Reg, unsigned ShadowReg) {
if (isAllocated(Reg)) return 0;
MarkAllocated(Reg);
MarkAllocated(ShadowReg);
return Reg;
}
unsigned AllocateReg(const uint16_t *Regs, unsigned NumRegs) {
unsigned FirstUnalloc = getFirstUnallocated(Regs, NumRegs);
if (FirstUnalloc == NumRegs)
return 0;
unsigned Reg = Regs[FirstUnalloc];
MarkAllocated(Reg);
return Reg;
}
unsigned AllocateReg(const uint16_t *Regs, const uint16_t *ShadowRegs,
unsigned NumRegs) {
unsigned FirstUnalloc = getFirstUnallocated(Regs, NumRegs);
if (FirstUnalloc == NumRegs)
return 0;
unsigned Reg = Regs[FirstUnalloc], ShadowReg = ShadowRegs[FirstUnalloc];
MarkAllocated(Reg);
MarkAllocated(ShadowReg);
return Reg;
}
unsigned AllocateStack(unsigned Size, unsigned Align) {
assert(Align && ((Align-1) & Align) == 0); StackOffset = ((StackOffset + Align-1) & ~(Align-1));
unsigned Result = StackOffset;
StackOffset += Size;
MF.getFrameInfo()->ensureMaxAlignment(Align);
return Result;
}
unsigned AllocateStack(unsigned Size, unsigned Align, unsigned ShadowReg) {
MarkAllocated(ShadowReg);
return AllocateStack(Size, Align);
}
void HandleByVal(unsigned ValNo, MVT ValVT,
MVT LocVT, CCValAssign::LocInfo LocInfo,
int MinSize, int MinAlign, ISD::ArgFlagsTy ArgFlags);
unsigned getFirstByValReg() const { return FirstByValRegValid ? FirstByValReg : 0; }
void setFirstByValReg(unsigned r) { FirstByValReg = r; FirstByValRegValid = true; }
void clearFirstByValReg() { FirstByValReg = 0; FirstByValRegValid = false; }
bool isFirstByValRegValid() const { return FirstByValRegValid; }
ParmContext getCallOrPrologue() const { return CallOrPrologue; }
private:
void MarkAllocated(unsigned Reg);
};
}
#endif