--- /dev/null
+//===-- 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
#include "llvm/Intrinsics.h"
#include "llvm/ADT/VectorExtras.h"
#include "llvm/Analysis/ScalarEvolutionExpressions.h"
+#include "llvm/CodeGen/CallingConvLower.h"
#include "llvm/CodeGen/MachineFrameInfo.h"
#include "llvm/CodeGen/MachineFunction.h"
#include "llvm/CodeGen/MachineInstrBuilder.h"
// X86-64 C Calling Convention implementation
//===----------------------------------------------------------------------===//
-class CallingConvState {
- unsigned StackOffset;
- const MRegisterInfo &MRI;
- SmallVector<uint32_t, 16> UsedRegs;
-public:
- CallingConvState(const MRegisterInfo &mri) : MRI(mri) {
- // No stack is used.
- StackOffset = 0;
-
- UsedRegs.resize(MRI.getNumRegs());
- }
-
- 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);
- if (const unsigned *RegAliases = MRI.getAliasSet(Reg))
- for (; *RegAliases; ++RegAliases)
- MarkAllocated(*RegAliases);
- 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:
- void MarkAllocated(unsigned Reg) {
- UsedRegs[Reg/32] |= 1 << (Reg&31);
- }
-};
-
-/// 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; }
-};
-
/// X86_64_CCC_AssignArgument - Implement the X86-64 C Calling Convention.
static void X86_64_CCC_AssignArgument(unsigned ValNo,
MVT::ValueType ArgVT, unsigned ArgFlags,
- CallingConvState &State,
+ CCState &State,
SmallVector<CCValAssign, 16> &Locs) {
MVT::ValueType LocVT = ArgVT;
CCValAssign::LocInfo LocInfo = CCValAssign::Full;
SmallVector<SDOperand, 8> ArgValues;
- CallingConvState CCState(*getTargetMachine().getRegisterInfo());
+ CCState CCInfo(*getTargetMachine().getRegisterInfo());
SmallVector<CCValAssign, 16> ArgLocs;
for (unsigned i = 0; i != NumArgs; ++i) {
MVT::ValueType ArgVT = Op.getValue(i).getValueType();
unsigned ArgFlags = cast<ConstantSDNode>(Op.getOperand(3+i))->getValue();
- X86_64_CCC_AssignArgument(i, ArgVT, ArgFlags, CCState, ArgLocs);
+ X86_64_CCC_AssignArgument(i, ArgVT, ArgFlags, CCInfo, ArgLocs);
}
+ unsigned LastVal = ~0U;
for (unsigned i = 0, e = ArgLocs.size(); i != e; ++i) {
CCValAssign &VA = ArgLocs[i];
-
+ // TODO: If an arg is passed in two places (e.g. reg and stack), skip later
+ // places.
+ assert(VA.getValNo() != LastVal &&
+ "Don't support value assigned to multiple locs yet");
+ LastVal = VA.getValNo();
if (VA.isRegLoc()) {
MVT::ValueType RegVT = VA.getLocVT();
}
}
- unsigned StackSize = CCState.getNextStackOffset();
+ unsigned StackSize = CCInfo.getNextStackOffset();
// If the function takes variable number of arguments, make a frame index for
// the start of the first vararg value... for expansion of llvm.va_start.
if (isVarArg) {
- unsigned NumIntRegs = CCState.getFirstUnallocated(GPR64ArgRegs, 6);
- unsigned NumXMMRegs = CCState.getFirstUnallocated(XMMArgRegs, 8);
+ unsigned NumIntRegs = CCInfo.getFirstUnallocated(GPR64ArgRegs, 6);
+ unsigned NumXMMRegs = CCInfo.getFirstUnallocated(XMMArgRegs, 8);
// For X86-64, if there are vararg parameters that are passed via
// registers, then we must store them to their spots on the stack so they
SDOperand Callee = Op.getOperand(4);
unsigned NumOps = (Op.getNumOperands() - 5) / 2;
- CallingConvState CCState(*getTargetMachine().getRegisterInfo());
+ CCState CCInfo(*getTargetMachine().getRegisterInfo());
SmallVector<CCValAssign, 16> ArgLocs;
for (unsigned i = 0; i != NumOps; ++i) {
MVT::ValueType ArgVT = Op.getOperand(5+2*i).getValueType();
unsigned ArgFlags =cast<ConstantSDNode>(Op.getOperand(5+2*i+1))->getValue();
- X86_64_CCC_AssignArgument(i, ArgVT, ArgFlags, CCState, ArgLocs);
+ X86_64_CCC_AssignArgument(i, ArgVT, ArgFlags, CCInfo, ArgLocs);
}
// Get a count of how many bytes are to be pushed on the stack.
- unsigned NumBytes = CCState.getNextStackOffset();
+ unsigned NumBytes = CCInfo.getNextStackOffset();
Chain = DAG.getCALLSEQ_START(Chain,DAG.getConstant(NumBytes, getPointerTy()));
SmallVector<std::pair<unsigned, SDOperand>, 8> RegsToPass;
SDOperand StackPtr;
// Walk the register/memloc assignments, inserting copies/loads.
- unsigned LastVal = ~0U;
for (unsigned i = 0, e = ArgLocs.size(); i != e; ++i) {
CCValAssign &VA = ArgLocs[i];
-
- assert(VA.getValNo() != LastVal &&
- "Don't support value assigned to multiple locs yet");
- LastVal = VA.getValNo();
-
SDOperand Arg = Op.getOperand(5+2*VA.getValNo());
// Promote the value if needed.
X86::XMM0, X86::XMM1, X86::XMM2, X86::XMM3,
X86::XMM4, X86::XMM5, X86::XMM6, X86::XMM7
};
- unsigned NumXMMRegs = CCState.getFirstUnallocated(XMMArgRegs, 8);
+ unsigned NumXMMRegs = CCInfo.getFirstUnallocated(XMMArgRegs, 8);
Chain = DAG.getCopyToReg(Chain, X86::AL,
DAG.getConstant(NumXMMRegs, MVT::i8), InFlag);
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