122 lines
4.3 KiB
C++
122 lines
4.3 KiB
C++
//===-- MipsMachineFunctionInfo.h - Private data used for Mips ----*- C++ -*-=//
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//
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// The LLVM Compiler Infrastructure
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//
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// This file is distributed under the University of Illinois Open Source
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// 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 Mips specific subclass of MachineFunctionInfo.
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//
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//===----------------------------------------------------------------------===//
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#ifndef MIPS_MACHINE_FUNCTION_INFO_H
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#define MIPS_MACHINE_FUNCTION_INFO_H
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#include "llvm/ADT/VectorExtras.h"
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#include "llvm/CodeGen/MachineFunction.h"
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#include "llvm/CodeGen/MachineFrameInfo.h"
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namespace llvm {
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/// MipsFunctionInfo - This class is derived from MachineFunction private
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/// Mips target-specific information for each MachineFunction.
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class MipsFunctionInfo : public MachineFunctionInfo {
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private:
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/// Holds for each function where on the stack the Frame Pointer must be
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/// saved.
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int FPStackOffset;
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/// Holds for each function where on the stack the Return Address must be
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/// saved.
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int RAStackOffset;
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/// MipsFIHolder - Holds a FrameIndex and it's Stack Pointer Offset
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struct MipsFIHolder {
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int FI;
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int SPOffset;
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MipsFIHolder(int FrameIndex, int StackPointerOffset)
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: FI(FrameIndex), SPOffset(StackPointerOffset) {}
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};
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/// When PIC is used the GP must be saved on the stack on the function
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/// prologue and must be reloaded from this stack location after every
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/// call. A reference to its stack location and frame index must be kept
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/// to be used on emitPrologue and processFunctionBeforeFrameFinalized.
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MipsFIHolder GPHolder;
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// On LowerFORMAL_ARGUMENTS the stack size is unknown, so the Stack
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// Pointer Offset calculation of "not in register arguments" must be
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// postponed to emitPrologue.
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SmallVector<MipsFIHolder, 16> FnLoadArgs;
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bool HasLoadArgs;
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// When VarArgs, we must write registers back to caller stack, preserving
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// on register arguments. Since the stack size is unknown on
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// LowerFORMAL_ARGUMENTS, the Stack Pointer Offset calculation must be
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// postponed to emitPrologue.
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SmallVector<MipsFIHolder, 4> FnStoreVarArgs;
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bool HasStoreVarArgs;
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/// SRetReturnReg - Some subtargets require that sret lowering includes
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/// returning the value of the returned struct in a register. This field
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/// holds the virtual register into which the sret argument is passed.
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unsigned SRetReturnReg;
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public:
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MipsFunctionInfo(MachineFunction& MF)
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: FPStackOffset(0), RAStackOffset(0), GPHolder(-1,-1), HasLoadArgs(false),
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HasStoreVarArgs(false), SRetReturnReg(0)
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{}
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int getFPStackOffset() const { return FPStackOffset; }
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void setFPStackOffset(int Off) { FPStackOffset = Off; }
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int getRAStackOffset() const { return RAStackOffset; }
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void setRAStackOffset(int Off) { RAStackOffset = Off; }
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int getGPStackOffset() const { return GPHolder.SPOffset; }
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int getGPFI() const { return GPHolder.FI; }
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void setGPStackOffset(int Off) { GPHolder.SPOffset = Off; }
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void setGPFI(int FI) { GPHolder.FI = FI; }
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int getTopSavedRegOffset() const {
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return (RAStackOffset > FPStackOffset) ?
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(RAStackOffset) : (FPStackOffset);
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}
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bool hasLoadArgs() const { return HasLoadArgs; }
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bool hasStoreVarArgs() const { return HasStoreVarArgs; }
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void recordLoadArgsFI(int FI, int SPOffset) {
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if (!HasLoadArgs) HasLoadArgs=true;
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FnLoadArgs.push_back(MipsFIHolder(FI, SPOffset));
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}
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void recordStoreVarArgsFI(int FI, int SPOffset) {
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if (!HasStoreVarArgs) HasStoreVarArgs=true;
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FnStoreVarArgs.push_back(MipsFIHolder(FI, SPOffset));
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}
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void adjustLoadArgsFI(MachineFrameInfo *MFI) const {
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if (!hasLoadArgs()) return;
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for (unsigned i = 0, e = FnLoadArgs.size(); i != e; ++i)
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MFI->setObjectOffset( FnLoadArgs[i].FI, FnLoadArgs[i].SPOffset );
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}
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void adjustStoreVarArgsFI(MachineFrameInfo *MFI) const {
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if (!hasStoreVarArgs()) return;
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for (unsigned i = 0, e = FnStoreVarArgs.size(); i != e; ++i)
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MFI->setObjectOffset( FnStoreVarArgs[i].FI, FnStoreVarArgs[i].SPOffset );
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}
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unsigned getSRetReturnReg() const { return SRetReturnReg; }
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void setSRetReturnReg(unsigned Reg) { SRetReturnReg = Reg; }
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};
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} // end of namespace llvm
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#endif // MIPS_MACHINE_FUNCTION_INFO_H
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