Changes in directory llvm/include/llvm/CodeGen:
CallingConvLower.h added (r1.1)
---
Log message:
move CC Lowering stuff to its own public interface
---
Diffs of the changes: (+149 -0)
CallingConvLower.h | 149 +++++++++++++++++++++++++++++++++++++++++++++++++++++
1 files changed, 149 insertions(+)
Index: llvm/include/llvm/CodeGen/CallingConvLower.h
diff -c /dev/null llvm/include/llvm/CodeGen/CallingConvLower.h:1.1
*** /dev/null Mon Feb 26 22:43:12 2007
--- llvm/include/llvm/CodeGen/CallingConvLower.h Mon Feb 26 22:43:02 2007
***************
*** 0 ****
--- 1,149 ----
+ //===-- llvm/CallingConvLower.h - Calling Conventions -----------*- C++
-*-===//
+ //
+ // The LLVM Compiler Infrastructure
+ //
+ // This file was developed by Chris Lattner and is distributed under
+ // the University of Illinois Open Source License. See LICENSE.TXT for
details.
+ //
+
//===----------------------------------------------------------------------===//
+ //
+ // This file declares the CCState and CCValAssign classes, used for lowering
+ // and implementing calling conventions.
+ //
+
//===----------------------------------------------------------------------===//
+
+ #ifndef LLVM_CODEGEN_CALLINGCONVLOWER_H
+ #define LLVM_CODEGEN_CALLINGCONVLOWER_H
+
+ #include "llvm/ADT/SmallVector.h"
+ #include "llvm/CodeGen/ValueTypes.h"
+
+ namespace llvm {
+ class MRegisterInfo;
+
+ /// 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 CCState {
+ unsigned StackOffset;
+ const MRegisterInfo &MRI;
+ SmallVector<uint32_t, 16> UsedRegs;
+ public:
+ CCState(const MRegisterInfo &mri);
+
+ 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));
+ }
+
+ /// 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 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;
+ }
+
+ /// 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;
+ }
+ private:
+ /// MarkAllocated - Mark a register and all of its aliases as allocated.
+ void MarkAllocated(unsigned Reg);
+ };
+
+ /// CCValAssign - Represent assignment of one arg/retval to a location.
+ class CCValAssign {
+ public:
+ enum LocInfo {
+ Full, // The value fills the full location.
+ SExt, // The value is sign extended in the location.
+ ZExt, // The value is zero extended in the location.
+ AExt // The value is extended with undefined upper bits.
+ // TODO: a subset of the value is in the location.
+ };
+ private:
+ /// ValNo - This is the value number begin assigned (e.g. an argument
number).
+ unsigned ValNo;
+
+ /// Loc is either a stack offset or a register number.
+ unsigned Loc;
+
+ /// isMem - True if this is a memory loc, false if it is a register loc.
+ bool isMem : 1;
+
+ /// Information about how the value is assigned.
+ LocInfo HTP : 7;
+
+ /// ValVT - The type of the value being assigned.
+ MVT::ValueType ValVT : 8;
+
+ /// LocVT - The type of the location being assigned to.
+ MVT::ValueType LocVT : 8;
+ public:
+
+ static CCValAssign getReg(unsigned ValNo, MVT::ValueType ValVT,
+ unsigned RegNo, MVT::ValueType LocVT,
+ LocInfo HTP) {
+ CCValAssign Ret;
+ Ret.ValNo = ValNo;
+ Ret.Loc = RegNo;
+ Ret.isMem = false;
+ Ret.HTP = HTP;
+ Ret.ValVT = ValVT;
+ Ret.LocVT = LocVT;
+ return Ret;
+ }
+ static CCValAssign getMem(unsigned ValNo, MVT::ValueType ValVT,
+ unsigned Offset, MVT::ValueType LocVT,
+ LocInfo HTP) {
+ CCValAssign Ret;
+ Ret.ValNo = ValNo;
+ Ret.Loc = Offset;
+ Ret.isMem = true;
+ Ret.HTP = HTP;
+ Ret.ValVT = ValVT;
+ Ret.LocVT = LocVT;
+ return Ret;
+ }
+
+ unsigned getValNo() const { return ValNo; }
+ MVT::ValueType getValVT() const { return ValVT; }
+
+ bool isRegLoc() const { return !isMem; }
+ bool isMemLoc() const { return isMem; }
+
+ unsigned getLocReg() const { assert(isRegLoc()); return Loc; }
+ unsigned getLocMemOffset() const { assert(isMemLoc()); return Loc; }
+ MVT::ValueType getLocVT() const { return LocVT; }
+
+ LocInfo getLocInfo() const { return HTP; }
+ };
+
+ } // end namespace llvm
+
+ #endif
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