mirror of
https://github.com/c64scene-ar/llvm-6502.git
synced 2024-08-30 21:29:28 +00:00
Added fp register clobbering during calls. Added AsmPrinter support for "fmask", a bitmask that indicates where on the stack the fp callee saved registers are. Fixed the stack frame layout for Mips, now the callee saved regs are in the right stack location (a little documentation about how this stack frame must look like is present in MipsRegisterInfo.cpp). This was done using the method MipsRegisterInfo::adjustMipsStackFrame To be more clear, these are examples of what is solves : 1) FP and RA are also callee saved, and despite they aren't in CSI they must be saved before the fp callee saved registers. 2) The ABI requires that local varibles are allocated before the callee saved register area, the opposite behavior from the default allocation. 3) CPU and FPU saved register area must be aligned independent of each other. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@54403 91177308-0d34-0410-b5e6-96231b3b80d8
131 lines
4.9 KiB
C++
131 lines
4.9 KiB
C++
//===-- MipsMachineFunctionInfo.h - Private data used for Mips ----*- C++ -*-=//
|
|
//
|
|
// The LLVM Compiler Infrastructure
|
|
//
|
|
// This file is distributed under the University of Illinois Open Source
|
|
// License. See LICENSE.TXT for details.
|
|
//
|
|
//===----------------------------------------------------------------------===//
|
|
//
|
|
// This file declares the Mips specific subclass of MachineFunctionInfo.
|
|
//
|
|
//===----------------------------------------------------------------------===//
|
|
|
|
#ifndef MIPS_MACHINE_FUNCTION_INFO_H
|
|
#define MIPS_MACHINE_FUNCTION_INFO_H
|
|
|
|
#include "llvm/ADT/VectorExtras.h"
|
|
#include "llvm/CodeGen/MachineFunction.h"
|
|
#include "llvm/CodeGen/MachineFrameInfo.h"
|
|
|
|
namespace llvm {
|
|
|
|
/// MipsFunctionInfo - This class is derived from MachineFunction private
|
|
/// Mips target-specific information for each MachineFunction.
|
|
class MipsFunctionInfo : public MachineFunctionInfo {
|
|
|
|
private:
|
|
/// Holds for each function where on the stack the Frame Pointer must be
|
|
/// saved. This is used on Prologue and Epilogue to emit FP save/restore
|
|
int FPStackOffset;
|
|
|
|
/// Holds for each function where on the stack the Return Address must be
|
|
/// saved. This is used on Prologue and Epilogue to emit RA save/restore
|
|
int RAStackOffset;
|
|
|
|
/// At each function entry, two special bitmask directives must be emitted
|
|
/// to help debugging, for CPU and FPU callee saved registers. Both need
|
|
/// the negative offset from the final stack size and its higher registers
|
|
/// location on the stack.
|
|
int CPUTopSavedRegOff;
|
|
int FPUTopSavedRegOff;
|
|
|
|
/// MipsFIHolder - Holds a FrameIndex and it's Stack Pointer Offset
|
|
struct MipsFIHolder {
|
|
|
|
int FI;
|
|
int SPOffset;
|
|
|
|
MipsFIHolder(int FrameIndex, int StackPointerOffset)
|
|
: FI(FrameIndex), SPOffset(StackPointerOffset) {}
|
|
};
|
|
|
|
/// When PIC is used the GP must be saved on the stack on the function
|
|
/// prologue and must be reloaded from this stack location after every
|
|
/// call. A reference to its stack location and frame index must be kept
|
|
/// to be used on emitPrologue and processFunctionBeforeFrameFinalized.
|
|
MipsFIHolder GPHolder;
|
|
|
|
/// On LowerFORMAL_ARGUMENTS the stack size is unknown, so the Stack
|
|
/// Pointer Offset calculation of "not in register arguments" must be
|
|
/// postponed to emitPrologue.
|
|
SmallVector<MipsFIHolder, 16> FnLoadArgs;
|
|
bool HasLoadArgs;
|
|
|
|
// When VarArgs, we must write registers back to caller stack, preserving
|
|
// on register arguments. Since the stack size is unknown on
|
|
// LowerFORMAL_ARGUMENTS, the Stack Pointer Offset calculation must be
|
|
// postponed to emitPrologue.
|
|
SmallVector<MipsFIHolder, 4> FnStoreVarArgs;
|
|
bool HasStoreVarArgs;
|
|
|
|
/// SRetReturnReg - Some subtargets require that sret lowering includes
|
|
/// returning the value of the returned struct in a register. This field
|
|
/// holds the virtual register into which the sret argument is passed.
|
|
unsigned SRetReturnReg;
|
|
|
|
public:
|
|
MipsFunctionInfo(MachineFunction& MF)
|
|
: FPStackOffset(0), RAStackOffset(0), CPUTopSavedRegOff(0),
|
|
FPUTopSavedRegOff(0), GPHolder(-1,-1), HasLoadArgs(false),
|
|
HasStoreVarArgs(false), SRetReturnReg(0)
|
|
{}
|
|
|
|
int getFPStackOffset() const { return FPStackOffset; }
|
|
void setFPStackOffset(int Off) { FPStackOffset = Off; }
|
|
|
|
int getRAStackOffset() const { return RAStackOffset; }
|
|
void setRAStackOffset(int Off) { RAStackOffset = Off; }
|
|
|
|
int getCPUTopSavedRegOff() const { return CPUTopSavedRegOff; }
|
|
void setCPUTopSavedRegOff(int Off) { CPUTopSavedRegOff = Off; }
|
|
|
|
int getFPUTopSavedRegOff() const { return FPUTopSavedRegOff; }
|
|
void setFPUTopSavedRegOff(int Off) { FPUTopSavedRegOff = Off; }
|
|
|
|
int getGPStackOffset() const { return GPHolder.SPOffset; }
|
|
int getGPFI() const { return GPHolder.FI; }
|
|
void setGPStackOffset(int Off) { GPHolder.SPOffset = Off; }
|
|
void setGPFI(int FI) { GPHolder.FI = FI; }
|
|
|
|
bool hasLoadArgs() const { return HasLoadArgs; }
|
|
bool hasStoreVarArgs() const { return HasStoreVarArgs; }
|
|
|
|
void recordLoadArgsFI(int FI, int SPOffset) {
|
|
if (!HasLoadArgs) HasLoadArgs=true;
|
|
FnLoadArgs.push_back(MipsFIHolder(FI, SPOffset));
|
|
}
|
|
void recordStoreVarArgsFI(int FI, int SPOffset) {
|
|
if (!HasStoreVarArgs) HasStoreVarArgs=true;
|
|
FnStoreVarArgs.push_back(MipsFIHolder(FI, SPOffset));
|
|
}
|
|
|
|
void adjustLoadArgsFI(MachineFrameInfo *MFI) const {
|
|
if (!hasLoadArgs()) return;
|
|
for (unsigned i = 0, e = FnLoadArgs.size(); i != e; ++i)
|
|
MFI->setObjectOffset( FnLoadArgs[i].FI, FnLoadArgs[i].SPOffset );
|
|
}
|
|
void adjustStoreVarArgsFI(MachineFrameInfo *MFI) const {
|
|
if (!hasStoreVarArgs()) return;
|
|
for (unsigned i = 0, e = FnStoreVarArgs.size(); i != e; ++i)
|
|
MFI->setObjectOffset( FnStoreVarArgs[i].FI, FnStoreVarArgs[i].SPOffset );
|
|
}
|
|
|
|
unsigned getSRetReturnReg() const { return SRetReturnReg; }
|
|
void setSRetReturnReg(unsigned Reg) { SRetReturnReg = Reg; }
|
|
};
|
|
|
|
} // end of namespace llvm
|
|
|
|
#endif // MIPS_MACHINE_FUNCTION_INFO_H
|