//
// The LLVM Compiler Infrastructure
//
-// This file was developed by Bruno Cardoso Lopes and is distributed under
-// the University of Illinois Open Source License. See LICENSE.TXT for details.
+// This file is distributed under the University of Illinois Open Source
+// License. See LICENSE.TXT for details.
//
//===----------------------------------------------------------------------===//
//
#ifndef MIPS_MACHINE_FUNCTION_INFO_H
#define MIPS_MACHINE_FUNCTION_INFO_H
-#include "llvm/ADT/VectorExtras.h"
+#include <utility>
+#include "llvm/ADT/SmallVector.h"
#include "llvm/CodeGen/MachineFunction.h"
#include "llvm/CodeGen/MachineFrameInfo.h"
/// 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
- int FPStackOffset;
-
- /// Holds for each function where on the stack
- /// the Return Address must be saved
- int RAStackOffset;
-
- /// When PIC is used the GP must be saved on the stack
- /// on the function prologue, so a reference to its stack
- /// location must be kept.
- int GPStackOffset;
-
- /// 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) {}
- };
-
- // 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;
+ virtual void anchor();
+
+ MachineFunction& MF;
+ /// 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;
+
+ /// GlobalBaseReg - keeps track of the virtual register initialized for
+ /// use as the global base register. This is used for PIC in some PIC
+ /// relocation models.
+ unsigned GlobalBaseReg;
+
+ /// VarArgsFrameIndex - FrameIndex for start of varargs area.
+ int VarArgsFrameIndex;
+
+ // Range of frame object indices.
+ // InArgFIRange: Range of indices of all frame objects created during call to
+ // LowerFormalArguments.
+ // OutArgFIRange: Range of indices of all frame objects created during call to
+ // LowerCall except for the frame object for restoring $gp.
+ std::pair<int, int> InArgFIRange, OutArgFIRange;
+ int GPFI; // Index of the frame object for restoring $gp
+ mutable int DynAllocFI; // Frame index of dynamically allocated stack area.
+ unsigned MaxCallFrameSize;
public:
- MipsFunctionInfo(MachineFunction& MF)
- : FPStackOffset(0), RAStackOffset(0),
- HasLoadArgs(false), HasStoreVarArgs(false)
+ MipsFunctionInfo(MachineFunction& MF)
+ : MF(MF), SRetReturnReg(0), GlobalBaseReg(0),
+ VarArgsFrameIndex(0), InArgFIRange(std::make_pair(-1, 0)),
+ OutArgFIRange(std::make_pair(-1, 0)), GPFI(0), DynAllocFI(0),
+ MaxCallFrameSize(0)
{}
- int getFPStackOffset() const { return FPStackOffset; }
- void setFPStackOffset(int Off) { FPStackOffset = Off; }
+ bool isInArgFI(int FI) const {
+ return FI <= InArgFIRange.first && FI >= InArgFIRange.second;
+ }
+ void setLastInArgFI(int FI) { InArgFIRange.second = FI; }
+
+ bool isOutArgFI(int FI) const {
+ return FI <= OutArgFIRange.first && FI >= OutArgFIRange.second;
+ }
+ void extendOutArgFIRange(int FirstFI, int LastFI) {
+ if (!OutArgFIRange.second)
+ // this must be the first time this function was called.
+ OutArgFIRange.first = FirstFI;
+ OutArgFIRange.second = LastFI;
+ }
- int getRAStackOffset() const { return RAStackOffset; }
- void setRAStackOffset(int Off) { RAStackOffset = Off; }
+ int getGPFI() const { return GPFI; }
+ void setGPFI(int FI) { GPFI = FI; }
+ bool needGPSaveRestore() const { return getGPFI(); }
+ bool isGPFI(int FI) const { return GPFI && GPFI == FI; }
- int getGPStackOffset() const { return GPStackOffset; }
- void setGPStackOffset(int Off) { GPStackOffset = Off; }
+ // The first call to this function creates a frame object for dynamically
+ // allocated stack area.
+ int getDynAllocFI() const {
+ if (!DynAllocFI)
+ DynAllocFI = MF.getFrameInfo()->CreateFixedObject(4, 0, true);
- int getTopSavedRegOffset() const {
- return (RAStackOffset > FPStackOffset) ?
- (RAStackOffset) : (FPStackOffset);
+ return DynAllocFI;
}
+ bool isDynAllocFI(int FI) const { return DynAllocFI && DynAllocFI == FI; }
- bool hasLoadArgs() const { return HasLoadArgs; }
- bool hasStoreVarArgs() const { return HasStoreVarArgs; }
+ unsigned getSRetReturnReg() const { return SRetReturnReg; }
+ void setSRetReturnReg(unsigned Reg) { SRetReturnReg = Reg; }
- 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));
- }
+ bool globalBaseRegFixed() const;
+ bool globalBaseRegSet() const;
+ unsigned getGlobalBaseReg();
- 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 );
- }
+ int getVarArgsFrameIndex() const { return VarArgsFrameIndex; }
+ void setVarArgsFrameIndex(int Index) { VarArgsFrameIndex = Index; }
+ unsigned getMaxCallFrameSize() const { return MaxCallFrameSize; }
+ void setMaxCallFrameSize(unsigned S) { MaxCallFrameSize = S; }
};
} // end of namespace llvm
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