1 //===-- MipsMachineFunctionInfo.h - Private data used for Mips ----*- C++ -*-=//
3 // The LLVM Compiler Infrastructure
5 // This file was developed by Bruno Cardoso Lopes and is distributed under
6 // the University of Illinois Open Source License. See LICENSE.TXT for details.
8 //===----------------------------------------------------------------------===//
10 // This file declares the Mips specific subclass of MachineFunctionInfo.
12 //===----------------------------------------------------------------------===//
14 #ifndef MIPS_MACHINE_FUNCTION_INFO_H
15 #define MIPS_MACHINE_FUNCTION_INFO_H
17 #include "llvm/ADT/VectorExtras.h"
18 #include "llvm/CodeGen/MachineFunction.h"
19 #include "llvm/CodeGen/MachineFrameInfo.h"
23 /// MipsFunctionInfo - This class is derived from MachineFunction private
24 /// Mips target-specific information for each MachineFunction.
25 class MipsFunctionInfo : public MachineFunctionInfo {
28 /// Holds for each function where on the stack
29 /// the Frame Pointer must be saved
32 /// Holds for each function where on the stack
33 /// the Return Address must be saved
36 /// MipsFIHolder - Holds a FrameIndex and it's Stack Pointer Offset
42 MipsFIHolder(int FrameIndex, int StackPointerOffset)
43 : FI(FrameIndex), SPOffset(StackPointerOffset) {}
46 // On LowerFORMAL_ARGUMENTS the stack size is unknown,
47 // so the Stack Pointer Offset calculation of "not in
48 // register arguments" must be postponed to emitPrologue.
49 SmallVector<MipsFIHolder, 16> FnLoadArgs;
52 // When VarArgs, we must write registers back to caller
53 // stack, preserving on register arguments. Since the
54 // stack size is unknown on LowerFORMAL_ARGUMENTS,
55 // the Stack Pointer Offset calculation must be
56 // postponed to emitPrologue.
57 SmallVector<MipsFIHolder, 4> FnStoreVarArgs;
61 MipsFunctionInfo(MachineFunction& MF)
62 : FPStackOffset(0), RAStackOffset(0),
63 HasLoadArgs(false), HasStoreVarArgs(false)
66 int getFPStackOffset() const { return FPStackOffset; }
67 void setFPStackOffset(int Off) { FPStackOffset = Off; }
69 int getRAStackOffset() const { return RAStackOffset; }
70 void setRAStackOffset(int Off) { RAStackOffset = Off; }
72 int getTopSavedRegOffset() const {
73 return (RAStackOffset > FPStackOffset) ?
74 (RAStackOffset) : (FPStackOffset);
77 bool hasLoadArgs() const { return HasLoadArgs; }
78 bool hasStoreVarArgs() const { return HasStoreVarArgs; }
80 void recordLoadArgsFI(int FI, int SPOffset) {
81 if (!HasLoadArgs) HasLoadArgs=true;
82 FnLoadArgs.push_back(MipsFIHolder(FI, SPOffset));
84 void recordStoreVarArgsFI(int FI, int SPOffset) {
85 if (!HasStoreVarArgs) HasStoreVarArgs=true;
86 FnStoreVarArgs.push_back(MipsFIHolder(FI, SPOffset));
89 void adjustLoadArgsFI(MachineFrameInfo *MFI) const {
90 if (!hasLoadArgs()) return;
91 for (unsigned i = 0, e = FnLoadArgs.size(); i != e; ++i)
92 MFI->setObjectOffset( FnLoadArgs[i].FI, FnLoadArgs[i].SPOffset );
94 void adjustStoreVarArgsFI(MachineFrameInfo *MFI) const {
95 if (!hasStoreVarArgs()) return;
96 for (unsigned i = 0, e = FnStoreVarArgs.size(); i != e; ++i)
97 MFI->setObjectOffset( FnStoreVarArgs[i].FI, FnStoreVarArgs[i].SPOffset );
102 } // end of namespace llvm
104 #endif // MIPS_MACHINE_FUNCTION_INFO_H