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git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@40986 91177308-0d34-0410-b5e6-96231b3b80d8
207 lines
6.7 KiB
C++
207 lines
6.7 KiB
C++
//===-- llvm/CallingConvLower.h - Calling Conventions -----------*- C++ -*-===//
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//
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// The LLVM Compiler Infrastructure
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//
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// This file was developed by Chris Lattner and is distributed under
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// the University of Illinois Open Source 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 CCState and CCValAssign classes, used for lowering
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// and implementing calling conventions.
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//
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//===----------------------------------------------------------------------===//
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#ifndef LLVM_CODEGEN_CALLINGCONVLOWER_H
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#define LLVM_CODEGEN_CALLINGCONVLOWER_H
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#include "llvm/ADT/SmallVector.h"
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#include "llvm/CodeGen/ValueTypes.h"
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namespace llvm {
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class MRegisterInfo;
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class TargetMachine;
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class CCState;
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class SDNode;
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/// CCValAssign - Represent assignment of one arg/retval to a location.
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class CCValAssign {
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public:
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enum LocInfo {
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Full, // The value fills the full location.
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SExt, // The value is sign extended in the location.
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ZExt, // The value is zero extended in the location.
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AExt // The value is extended with undefined upper bits.
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// TODO: a subset of the value is in the location.
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};
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private:
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/// ValNo - This is the value number begin assigned (e.g. an argument number).
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unsigned ValNo;
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/// Loc is either a stack offset or a register number.
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unsigned Loc;
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/// isMem - True if this is a memory loc, false if it is a register loc.
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bool isMem : 1;
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/// Information about how the value is assigned.
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LocInfo HTP : 7;
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/// ValVT - The type of the value being assigned.
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MVT::ValueType ValVT;
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/// LocVT - The type of the location being assigned to.
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MVT::ValueType LocVT;
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public:
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static CCValAssign getReg(unsigned ValNo, MVT::ValueType ValVT,
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unsigned RegNo, MVT::ValueType LocVT,
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LocInfo HTP) {
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CCValAssign Ret;
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Ret.ValNo = ValNo;
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Ret.Loc = RegNo;
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Ret.isMem = false;
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Ret.HTP = HTP;
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Ret.ValVT = ValVT;
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Ret.LocVT = LocVT;
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return Ret;
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}
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static CCValAssign getMem(unsigned ValNo, MVT::ValueType ValVT,
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unsigned Offset, MVT::ValueType LocVT,
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LocInfo HTP) {
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CCValAssign Ret;
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Ret.ValNo = ValNo;
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Ret.Loc = Offset;
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Ret.isMem = true;
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Ret.HTP = HTP;
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Ret.ValVT = ValVT;
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Ret.LocVT = LocVT;
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return Ret;
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}
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unsigned getValNo() const { return ValNo; }
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MVT::ValueType getValVT() const { return ValVT; }
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bool isRegLoc() const { return !isMem; }
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bool isMemLoc() const { return isMem; }
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unsigned getLocReg() const { assert(isRegLoc()); return Loc; }
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unsigned getLocMemOffset() const { assert(isMemLoc()); return Loc; }
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MVT::ValueType getLocVT() const { return LocVT; }
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LocInfo getLocInfo() const { return HTP; }
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};
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/// CCAssignFn - This function assigns a location for Val, updating State to
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/// reflect the change.
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typedef bool CCAssignFn(unsigned ValNo, MVT::ValueType ValVT,
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MVT::ValueType LocVT, CCValAssign::LocInfo LocInfo,
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unsigned ArgFlags, CCState &State);
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/// CCState - This class holds information needed while lowering arguments and
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/// return values. It captures which registers are already assigned and which
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/// stack slots are used. It provides accessors to allocate these values.
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class CCState {
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unsigned CallingConv;
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bool IsVarArg;
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const TargetMachine &TM;
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const MRegisterInfo &MRI;
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SmallVector<CCValAssign, 16> &Locs;
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unsigned StackOffset;
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SmallVector<uint32_t, 16> UsedRegs;
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public:
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CCState(unsigned CC, bool isVarArg, const TargetMachine &TM,
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SmallVector<CCValAssign, 16> &locs);
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void addLoc(const CCValAssign &V) {
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Locs.push_back(V);
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}
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const TargetMachine &getTarget() const { return TM; }
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unsigned getCallingConv() const { return CallingConv; }
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bool isVarArg() const { return IsVarArg; }
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unsigned getNextStackOffset() const { return StackOffset; }
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/// isAllocated - Return true if the specified register (or an alias) is
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/// allocated.
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bool isAllocated(unsigned Reg) const {
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return UsedRegs[Reg/32] & (1 << (Reg&31));
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}
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/// AnalyzeFormalArguments - Analyze an ISD::FORMAL_ARGUMENTS node,
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/// incorporating info about the formals into this state.
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void AnalyzeFormalArguments(SDNode *TheArgs, CCAssignFn Fn);
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/// AnalyzeReturn - Analyze the returned values of an ISD::RET node,
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/// incorporating info about the result values into this state.
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void AnalyzeReturn(SDNode *TheRet, CCAssignFn Fn);
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/// AnalyzeCallOperands - Analyze an ISD::CALL node, incorporating info
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/// about the passed values into this state.
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void AnalyzeCallOperands(SDNode *TheCall, CCAssignFn Fn);
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/// AnalyzeCallResult - Analyze the return values of an ISD::CALL node,
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/// incorporating info about the passed values into this state.
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void AnalyzeCallResult(SDNode *TheCall, CCAssignFn Fn);
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/// getFirstUnallocated - Return the first unallocated register in the set, or
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/// NumRegs if they are all allocated.
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unsigned getFirstUnallocated(const unsigned *Regs, unsigned NumRegs) const {
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for (unsigned i = 0; i != NumRegs; ++i)
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if (!isAllocated(Regs[i]))
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return i;
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return NumRegs;
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}
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/// AllocateReg - Attempt to allocate one register. If it is not available,
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/// return zero. Otherwise, return the register, marking it and any aliases
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/// as allocated.
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unsigned AllocateReg(unsigned Reg) {
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if (isAllocated(Reg)) return 0;
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MarkAllocated(Reg);
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return Reg;
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}
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/// AllocateReg - Attempt to allocate one of the specified registers. If none
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/// are available, return zero. Otherwise, return the first one available,
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/// marking it and any aliases as allocated.
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unsigned AllocateReg(const unsigned *Regs, unsigned NumRegs) {
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unsigned FirstUnalloc = getFirstUnallocated(Regs, NumRegs);
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if (FirstUnalloc == NumRegs)
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return 0; // Didn't find the reg.
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// Mark the register and any aliases as allocated.
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unsigned Reg = Regs[FirstUnalloc];
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MarkAllocated(Reg);
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return Reg;
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}
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/// AllocateStack - Allocate a chunk of stack space with the specified size
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/// and alignment.
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unsigned AllocateStack(unsigned Size, unsigned Align) {
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assert(Align && ((Align-1) & Align) == 0); // Align is power of 2.
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StackOffset = ((StackOffset + Align-1) & ~(Align-1));
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unsigned Result = StackOffset;
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StackOffset += Size;
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return Result;
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}
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void HandleStruct(unsigned ValNo, MVT::ValueType ValVT,
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MVT::ValueType LocVT, CCValAssign::LocInfo LocInfo,
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unsigned ArgFlags);
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private:
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/// MarkAllocated - Mark a register and all of its aliases as allocated.
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void MarkAllocated(unsigned Reg);
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};
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} // end namespace llvm
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#endif
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