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69c19f7316
The following improvements are accomplished as a result of applying this patch: - Fixed frame objects' offsets (relative to either the virtual frame pointer or the stack pointer) are set before instruction selection is completed. There is no need to wait until Prologue/Epilogue Insertion is run to set them. - Calculation of final offsets of fixed frame objects is straightforward. It is no longer necessary to assign negative offsets to fixed objects for incoming arguments in order to distinguish them from the others. - Since a fixed object has its relative offset set during instruction selection, there is no need to conservatively set its alignment to 4. - It is no longer necessary to reorder non-fixed frame objects in MipsFrameLowering::adjustMipsStackFrame. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@131915 91177308-0d34-0410-b5e6-96231b3b80d8
113 lines
4.1 KiB
C++
113 lines
4.1 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 <utility>
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#include "llvm/ADT/SmallVector.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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/// At each function entry, two special bitmask directives must be emitted
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/// to help debugging, for CPU and FPU callee saved registers. Both need
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/// the negative offset from the final stack size and its higher registers
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/// location on the stack.
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int CPUTopSavedRegOff;
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int FPUTopSavedRegOff;
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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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/// GlobalBaseReg - keeps track of the virtual register initialized for
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/// use as the global base register. This is used for PIC in some PIC
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/// relocation models.
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unsigned GlobalBaseReg;
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/// VarArgsFrameIndex - FrameIndex for start of varargs area.
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int VarArgsFrameIndex;
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// Range of frame object indices.
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// InArgFIRange: Range of indices of all frame objects created during call to
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// LowerFormalArguments.
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// OutArgFIRange: Range of indices of all frame objects created during call to
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// LowerCall except for the frame object for restoring $gp.
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std::pair<int, int> InArgFIRange, OutArgFIRange;
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int GPFI; // Index of the frame object for restoring $gp
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bool HasCall; // True if function has a function call.
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int MaxCallFrameSize;
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public:
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MipsFunctionInfo(MachineFunction& MF)
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: CPUTopSavedRegOff(0),
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FPUTopSavedRegOff(0), SRetReturnReg(0), GlobalBaseReg(0),
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VarArgsFrameIndex(0), InArgFIRange(std::make_pair(-1, 0)),
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OutArgFIRange(std::make_pair(-1, 0)), GPFI(0), HasCall(false),
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MaxCallFrameSize(-1)
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{}
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int getCPUTopSavedRegOff() const { return CPUTopSavedRegOff; }
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void setCPUTopSavedRegOff(int Off) { CPUTopSavedRegOff = Off; }
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int getFPUTopSavedRegOff() const { return FPUTopSavedRegOff; }
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void setFPUTopSavedRegOff(int Off) { FPUTopSavedRegOff = Off; }
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bool isInArgFI(int FI) const {
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return FI <= InArgFIRange.first && FI >= InArgFIRange.second;
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}
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void setLastInArgFI(int FI) { InArgFIRange.second = FI; }
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bool isOutArgFI(int FI) const {
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return FI <= OutArgFIRange.first && FI >= OutArgFIRange.second;
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}
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void extendOutArgFIRange(int FirstFI, int LastFI) {
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if (!OutArgFIRange.second)
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// this must be the first time this function was called.
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OutArgFIRange.first = FirstFI;
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OutArgFIRange.second = LastFI;
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}
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int getGPFI() const { return GPFI; }
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void setGPFI(int FI) { GPFI = FI; }
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bool needGPSaveRestore() const { return getGPFI(); }
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bool isGPFI(int FI) const { return GPFI && GPFI == FI; }
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unsigned getSRetReturnReg() const { return SRetReturnReg; }
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void setSRetReturnReg(unsigned Reg) { SRetReturnReg = Reg; }
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unsigned getGlobalBaseReg() const { return GlobalBaseReg; }
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void setGlobalBaseReg(unsigned Reg) { GlobalBaseReg = Reg; }
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int getVarArgsFrameIndex() const { return VarArgsFrameIndex; }
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void setVarArgsFrameIndex(int Index) { VarArgsFrameIndex = Index; }
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bool hasCall() const { return HasCall; }
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void setHasCall() { HasCall = true; }
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int getMaxCallFrameSize() const { return MaxCallFrameSize; }
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void setMaxCallFrameSize(int S) { MaxCallFrameSize = S; }
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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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