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git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@124028 91177308-0d34-0410-b5e6-96231b3b80d8
553 lines
22 KiB
C++
553 lines
22 KiB
C++
//===-- CodeGen/MachineFrameInfo.h - Abstract Stack Frame Rep. --*- 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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// The file defines the MachineFrameInfo class.
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//
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//===----------------------------------------------------------------------===//
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#ifndef LLVM_CODEGEN_MACHINEFRAMEINFO_H
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#define LLVM_CODEGEN_MACHINEFRAMEINFO_H
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#include "llvm/ADT/SmallVector.h"
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//#include "llvm/ADT/IndexedMap.h"
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#include "llvm/Support/DataTypes.h"
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#include <cassert>
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#include <vector>
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namespace llvm {
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class raw_ostream;
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class TargetData;
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class TargetRegisterClass;
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class Type;
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class MachineFunction;
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class MachineBasicBlock;
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class TargetFrameLowering;
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class BitVector;
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/// The CalleeSavedInfo class tracks the information need to locate where a
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/// callee saved register is in the current frame.
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class CalleeSavedInfo {
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unsigned Reg;
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int FrameIdx;
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public:
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explicit CalleeSavedInfo(unsigned R, int FI = 0)
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: Reg(R), FrameIdx(FI) {}
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// Accessors.
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unsigned getReg() const { return Reg; }
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int getFrameIdx() const { return FrameIdx; }
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void setFrameIdx(int FI) { FrameIdx = FI; }
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};
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/// The MachineFrameInfo class represents an abstract stack frame until
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/// prolog/epilog code is inserted. This class is key to allowing stack frame
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/// representation optimizations, such as frame pointer elimination. It also
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/// allows more mundane (but still important) optimizations, such as reordering
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/// of abstract objects on the stack frame.
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///
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/// To support this, the class assigns unique integer identifiers to stack
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/// objects requested clients. These identifiers are negative integers for
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/// fixed stack objects (such as arguments passed on the stack) or nonnegative
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/// for objects that may be reordered. Instructions which refer to stack
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/// objects use a special MO_FrameIndex operand to represent these frame
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/// indexes.
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///
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/// Because this class keeps track of all references to the stack frame, it
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/// knows when a variable sized object is allocated on the stack. This is the
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/// sole condition which prevents frame pointer elimination, which is an
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/// important optimization on register-poor architectures. Because original
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/// variable sized alloca's in the source program are the only source of
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/// variable sized stack objects, it is safe to decide whether there will be
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/// any variable sized objects before all stack objects are known (for
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/// example, register allocator spill code never needs variable sized
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/// objects).
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///
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/// When prolog/epilog code emission is performed, the final stack frame is
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/// built and the machine instructions are modified to refer to the actual
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/// stack offsets of the object, eliminating all MO_FrameIndex operands from
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/// the program.
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///
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/// @brief Abstract Stack Frame Information
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class MachineFrameInfo {
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// StackObject - Represent a single object allocated on the stack.
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struct StackObject {
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// SPOffset - The offset of this object from the stack pointer on entry to
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// the function. This field has no meaning for a variable sized element.
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int64_t SPOffset;
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// The size of this object on the stack. 0 means a variable sized object,
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// ~0ULL means a dead object.
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uint64_t Size;
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// Alignment - The required alignment of this stack slot.
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unsigned Alignment;
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// isImmutable - If true, the value of the stack object is set before
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// entering the function and is not modified inside the function. By
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// default, fixed objects are immutable unless marked otherwise.
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bool isImmutable;
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// isSpillSlot - If true the stack object is used as spill slot. It
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// cannot alias any other memory objects.
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bool isSpillSlot;
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// MayNeedSP - If true the stack object triggered the creation of the stack
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// protector. We should allocate this object right after the stack
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// protector.
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bool MayNeedSP;
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// PreAllocated - If true, the object was mapped into the local frame
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// block and doesn't need additional handling for allocation beyond that.
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bool PreAllocated;
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StackObject(uint64_t Sz, unsigned Al, int64_t SP, bool IM,
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bool isSS, bool NSP)
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: SPOffset(SP), Size(Sz), Alignment(Al), isImmutable(IM),
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isSpillSlot(isSS), MayNeedSP(NSP), PreAllocated(false) {}
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};
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/// Objects - The list of stack objects allocated...
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///
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std::vector<StackObject> Objects;
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/// NumFixedObjects - This contains the number of fixed objects contained on
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/// the stack. Because fixed objects are stored at a negative index in the
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/// Objects list, this is also the index to the 0th object in the list.
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///
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unsigned NumFixedObjects;
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/// HasVarSizedObjects - This boolean keeps track of whether any variable
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/// sized objects have been allocated yet.
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///
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bool HasVarSizedObjects;
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/// FrameAddressTaken - This boolean keeps track of whether there is a call
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/// to builtin \@llvm.frameaddress.
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bool FrameAddressTaken;
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/// ReturnAddressTaken - This boolean keeps track of whether there is a call
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/// to builtin \@llvm.returnaddress.
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bool ReturnAddressTaken;
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/// StackSize - The prolog/epilog code inserter calculates the final stack
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/// offsets for all of the fixed size objects, updating the Objects list
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/// above. It then updates StackSize to contain the number of bytes that need
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/// to be allocated on entry to the function.
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///
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uint64_t StackSize;
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/// OffsetAdjustment - The amount that a frame offset needs to be adjusted to
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/// have the actual offset from the stack/frame pointer. The exact usage of
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/// this is target-dependent, but it is typically used to adjust between
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/// SP-relative and FP-relative offsets. E.G., if objects are accessed via
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/// SP then OffsetAdjustment is zero; if FP is used, OffsetAdjustment is set
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/// to the distance between the initial SP and the value in FP. For many
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/// targets, this value is only used when generating debug info (via
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/// TargetRegisterInfo::getFrameIndexOffset); when generating code, the
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/// corresponding adjustments are performed directly.
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int OffsetAdjustment;
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/// MaxAlignment - The prolog/epilog code inserter may process objects
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/// that require greater alignment than the default alignment the target
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/// provides. To handle this, MaxAlignment is set to the maximum alignment
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/// needed by the objects on the current frame. If this is greater than the
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/// native alignment maintained by the compiler, dynamic alignment code will
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/// be needed.
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///
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unsigned MaxAlignment;
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/// AdjustsStack - Set to true if this function adjusts the stack -- e.g.,
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/// when calling another function. This is only valid during and after
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/// prolog/epilog code insertion.
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bool AdjustsStack;
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/// HasCalls - Set to true if this function has any function calls.
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bool HasCalls;
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/// StackProtectorIdx - The frame index for the stack protector.
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int StackProtectorIdx;
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/// MaxCallFrameSize - This contains the size of the largest call frame if the
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/// target uses frame setup/destroy pseudo instructions (as defined in the
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/// TargetFrameInfo class). This information is important for frame pointer
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/// elimination. If is only valid during and after prolog/epilog code
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/// insertion.
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///
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unsigned MaxCallFrameSize;
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/// CSInfo - The prolog/epilog code inserter fills in this vector with each
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/// callee saved register saved in the frame. Beyond its use by the prolog/
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/// epilog code inserter, this data used for debug info and exception
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/// handling.
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std::vector<CalleeSavedInfo> CSInfo;
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/// CSIValid - Has CSInfo been set yet?
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bool CSIValid;
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/// TargetFrameLowering - Target information about frame layout.
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///
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const TargetFrameLowering &TFI;
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/// LocalFrameObjects - References to frame indices which are mapped
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/// into the local frame allocation block. <FrameIdx, LocalOffset>
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SmallVector<std::pair<int, int64_t>, 32> LocalFrameObjects;
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/// LocalFrameSize - Size of the pre-allocated local frame block.
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int64_t LocalFrameSize;
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/// Required alignment of the local object blob, which is the strictest
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/// alignment of any object in it.
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unsigned LocalFrameMaxAlign;
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/// Whether the local object blob needs to be allocated together. If not,
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/// PEI should ignore the isPreAllocated flags on the stack objects and
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/// just allocate them normally.
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bool UseLocalStackAllocationBlock;
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public:
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explicit MachineFrameInfo(const TargetFrameLowering &tfi) : TFI(tfi) {
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StackSize = NumFixedObjects = OffsetAdjustment = MaxAlignment = 0;
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HasVarSizedObjects = false;
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FrameAddressTaken = false;
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ReturnAddressTaken = false;
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AdjustsStack = false;
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HasCalls = false;
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StackProtectorIdx = -1;
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MaxCallFrameSize = 0;
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CSIValid = false;
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LocalFrameSize = 0;
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LocalFrameMaxAlign = 0;
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UseLocalStackAllocationBlock = false;
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}
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/// hasStackObjects - Return true if there are any stack objects in this
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/// function.
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///
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bool hasStackObjects() const { return !Objects.empty(); }
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/// hasVarSizedObjects - This method may be called any time after instruction
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/// selection is complete to determine if the stack frame for this function
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/// contains any variable sized objects.
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///
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bool hasVarSizedObjects() const { return HasVarSizedObjects; }
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/// getStackProtectorIndex/setStackProtectorIndex - Return the index for the
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/// stack protector object.
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///
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int getStackProtectorIndex() const { return StackProtectorIdx; }
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void setStackProtectorIndex(int I) { StackProtectorIdx = I; }
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/// isFrameAddressTaken - This method may be called any time after instruction
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/// selection is complete to determine if there is a call to
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/// \@llvm.frameaddress in this function.
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bool isFrameAddressTaken() const { return FrameAddressTaken; }
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void setFrameAddressIsTaken(bool T) { FrameAddressTaken = T; }
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/// isReturnAddressTaken - This method may be called any time after
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/// instruction selection is complete to determine if there is a call to
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/// \@llvm.returnaddress in this function.
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bool isReturnAddressTaken() const { return ReturnAddressTaken; }
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void setReturnAddressIsTaken(bool s) { ReturnAddressTaken = s; }
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/// getObjectIndexBegin - Return the minimum frame object index.
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///
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int getObjectIndexBegin() const { return -NumFixedObjects; }
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/// getObjectIndexEnd - Return one past the maximum frame object index.
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///
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int getObjectIndexEnd() const { return (int)Objects.size()-NumFixedObjects; }
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/// getNumFixedObjects - Return the number of fixed objects.
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unsigned getNumFixedObjects() const { return NumFixedObjects; }
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/// getNumObjects - Return the number of objects.
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///
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unsigned getNumObjects() const { return Objects.size(); }
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/// mapLocalFrameObject - Map a frame index into the local object block
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void mapLocalFrameObject(int ObjectIndex, int64_t Offset) {
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LocalFrameObjects.push_back(std::pair<int, int64_t>(ObjectIndex, Offset));
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Objects[ObjectIndex + NumFixedObjects].PreAllocated = true;
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}
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/// getLocalFrameObjectMap - Get the local offset mapping for a for an object
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std::pair<int, int64_t> getLocalFrameObjectMap(int i) {
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assert (i >= 0 && (unsigned)i < LocalFrameObjects.size() &&
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"Invalid local object reference!");
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return LocalFrameObjects[i];
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}
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/// getLocalFrameObjectCount - Return the number of objects allocated into
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/// the local object block.
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int64_t getLocalFrameObjectCount() { return LocalFrameObjects.size(); }
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/// setLocalFrameSize - Set the size of the local object blob.
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void setLocalFrameSize(int64_t sz) { LocalFrameSize = sz; }
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/// getLocalFrameSize - Get the size of the local object blob.
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int64_t getLocalFrameSize() const { return LocalFrameSize; }
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/// setLocalFrameMaxAlign - Required alignment of the local object blob,
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/// which is the strictest alignment of any object in it.
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void setLocalFrameMaxAlign(unsigned Align) { LocalFrameMaxAlign = Align; }
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/// getLocalFrameMaxAlign - Return the required alignment of the local
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/// object blob.
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unsigned getLocalFrameMaxAlign() const { return LocalFrameMaxAlign; }
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/// getUseLocalStackAllocationBlock - Get whether the local allocation blob
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/// should be allocated together or let PEI allocate the locals in it
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/// directly.
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bool getUseLocalStackAllocationBlock() {return UseLocalStackAllocationBlock;}
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/// setUseLocalStackAllocationBlock - Set whether the local allocation blob
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/// should be allocated together or let PEI allocate the locals in it
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/// directly.
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void setUseLocalStackAllocationBlock(bool v) {
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UseLocalStackAllocationBlock = v;
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}
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/// isObjectPreAllocated - Return true if the object was pre-allocated into
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/// the local block.
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bool isObjectPreAllocated(int ObjectIdx) const {
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assert(unsigned(ObjectIdx+NumFixedObjects) < Objects.size() &&
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"Invalid Object Idx!");
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return Objects[ObjectIdx+NumFixedObjects].PreAllocated;
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}
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/// getObjectSize - Return the size of the specified object.
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///
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int64_t getObjectSize(int ObjectIdx) const {
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assert(unsigned(ObjectIdx+NumFixedObjects) < Objects.size() &&
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"Invalid Object Idx!");
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return Objects[ObjectIdx+NumFixedObjects].Size;
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}
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/// setObjectSize - Change the size of the specified stack object.
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void setObjectSize(int ObjectIdx, int64_t Size) {
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assert(unsigned(ObjectIdx+NumFixedObjects) < Objects.size() &&
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"Invalid Object Idx!");
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Objects[ObjectIdx+NumFixedObjects].Size = Size;
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}
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/// getObjectAlignment - Return the alignment of the specified stack object.
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unsigned getObjectAlignment(int ObjectIdx) const {
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assert(unsigned(ObjectIdx+NumFixedObjects) < Objects.size() &&
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"Invalid Object Idx!");
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return Objects[ObjectIdx+NumFixedObjects].Alignment;
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}
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/// setObjectAlignment - Change the alignment of the specified stack object.
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void setObjectAlignment(int ObjectIdx, unsigned Align) {
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assert(unsigned(ObjectIdx+NumFixedObjects) < Objects.size() &&
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"Invalid Object Idx!");
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Objects[ObjectIdx+NumFixedObjects].Alignment = Align;
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MaxAlignment = std::max(MaxAlignment, Align);
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}
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/// NeedsStackProtector - Returns true if the object may need stack
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/// protectors.
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bool MayNeedStackProtector(int ObjectIdx) const {
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assert(unsigned(ObjectIdx+NumFixedObjects) < Objects.size() &&
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"Invalid Object Idx!");
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return Objects[ObjectIdx+NumFixedObjects].MayNeedSP;
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}
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/// getObjectOffset - Return the assigned stack offset of the specified object
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/// from the incoming stack pointer.
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///
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int64_t getObjectOffset(int ObjectIdx) const {
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assert(unsigned(ObjectIdx+NumFixedObjects) < Objects.size() &&
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"Invalid Object Idx!");
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assert(!isDeadObjectIndex(ObjectIdx) &&
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"Getting frame offset for a dead object?");
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return Objects[ObjectIdx+NumFixedObjects].SPOffset;
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}
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/// setObjectOffset - Set the stack frame offset of the specified object. The
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/// offset is relative to the stack pointer on entry to the function.
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///
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void setObjectOffset(int ObjectIdx, int64_t SPOffset) {
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assert(unsigned(ObjectIdx+NumFixedObjects) < Objects.size() &&
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"Invalid Object Idx!");
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assert(!isDeadObjectIndex(ObjectIdx) &&
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"Setting frame offset for a dead object?");
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Objects[ObjectIdx+NumFixedObjects].SPOffset = SPOffset;
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}
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/// getStackSize - Return the number of bytes that must be allocated to hold
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/// all of the fixed size frame objects. This is only valid after
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/// Prolog/Epilog code insertion has finalized the stack frame layout.
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///
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uint64_t getStackSize() const { return StackSize; }
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/// setStackSize - Set the size of the stack...
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///
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void setStackSize(uint64_t Size) { StackSize = Size; }
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/// getOffsetAdjustment - Return the correction for frame offsets.
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///
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int getOffsetAdjustment() const { return OffsetAdjustment; }
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/// setOffsetAdjustment - Set the correction for frame offsets.
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///
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void setOffsetAdjustment(int Adj) { OffsetAdjustment = Adj; }
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/// getMaxAlignment - Return the alignment in bytes that this function must be
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/// aligned to, which is greater than the default stack alignment provided by
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/// the target.
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///
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unsigned getMaxAlignment() const { return MaxAlignment; }
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/// setMaxAlignment - Set the preferred alignment.
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///
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void setMaxAlignment(unsigned Align) { MaxAlignment = Align; }
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/// AdjustsStack - Return true if this function adjusts the stack -- e.g.,
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/// when calling another function. This is only valid during and after
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/// prolog/epilog code insertion.
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bool adjustsStack() const { return AdjustsStack; }
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void setAdjustsStack(bool V) { AdjustsStack = V; }
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/// hasCalls - Return true if the current function has any function calls.
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bool hasCalls() const { return HasCalls; }
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void setHasCalls(bool V) { HasCalls = V; }
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/// getMaxCallFrameSize - Return the maximum size of a call frame that must be
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/// allocated for an outgoing function call. This is only available if
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/// CallFrameSetup/Destroy pseudo instructions are used by the target, and
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/// then only during or after prolog/epilog code insertion.
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///
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unsigned getMaxCallFrameSize() const { return MaxCallFrameSize; }
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void setMaxCallFrameSize(unsigned S) { MaxCallFrameSize = S; }
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/// CreateFixedObject - Create a new object at a fixed location on the stack.
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/// All fixed objects should be created before other objects are created for
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/// efficiency. By default, fixed objects are immutable. This returns an
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/// index with a negative value.
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///
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int CreateFixedObject(uint64_t Size, int64_t SPOffset, bool Immutable);
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/// isFixedObjectIndex - Returns true if the specified index corresponds to a
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/// fixed stack object.
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bool isFixedObjectIndex(int ObjectIdx) const {
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return ObjectIdx < 0 && (ObjectIdx >= -(int)NumFixedObjects);
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}
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/// isImmutableObjectIndex - Returns true if the specified index corresponds
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/// to an immutable object.
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bool isImmutableObjectIndex(int ObjectIdx) const {
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assert(unsigned(ObjectIdx+NumFixedObjects) < Objects.size() &&
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"Invalid Object Idx!");
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return Objects[ObjectIdx+NumFixedObjects].isImmutable;
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}
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/// isSpillSlotObjectIndex - Returns true if the specified index corresponds
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/// to a spill slot..
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bool isSpillSlotObjectIndex(int ObjectIdx) const {
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assert(unsigned(ObjectIdx+NumFixedObjects) < Objects.size() &&
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"Invalid Object Idx!");
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return Objects[ObjectIdx+NumFixedObjects].isSpillSlot;;
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}
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/// isDeadObjectIndex - Returns true if the specified index corresponds to
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/// a dead object.
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bool isDeadObjectIndex(int ObjectIdx) const {
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assert(unsigned(ObjectIdx+NumFixedObjects) < Objects.size() &&
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"Invalid Object Idx!");
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return Objects[ObjectIdx+NumFixedObjects].Size == ~0ULL;
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}
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/// CreateStackObject - Create a new statically sized stack object, returning
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/// a nonnegative identifier to represent it.
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///
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int CreateStackObject(uint64_t Size, unsigned Alignment, bool isSS,
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bool MayNeedSP = false) {
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assert(Size != 0 && "Cannot allocate zero size stack objects!");
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Objects.push_back(StackObject(Size, Alignment, 0, false, isSS, MayNeedSP));
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int Index = (int)Objects.size() - NumFixedObjects - 1;
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assert(Index >= 0 && "Bad frame index!");
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MaxAlignment = std::max(MaxAlignment, Alignment);
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return Index;
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}
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/// CreateSpillStackObject - Create a new statically sized stack object that
|
|
/// represents a spill slot, returning a nonnegative identifier to represent
|
|
/// it.
|
|
///
|
|
int CreateSpillStackObject(uint64_t Size, unsigned Alignment) {
|
|
CreateStackObject(Size, Alignment, true, false);
|
|
int Index = (int)Objects.size() - NumFixedObjects - 1;
|
|
MaxAlignment = std::max(MaxAlignment, Alignment);
|
|
return Index;
|
|
}
|
|
|
|
/// RemoveStackObject - Remove or mark dead a statically sized stack object.
|
|
///
|
|
void RemoveStackObject(int ObjectIdx) {
|
|
// Mark it dead.
|
|
Objects[ObjectIdx+NumFixedObjects].Size = ~0ULL;
|
|
}
|
|
|
|
/// CreateVariableSizedObject - Notify the MachineFrameInfo object that a
|
|
/// variable sized object has been created. This must be created whenever a
|
|
/// variable sized object is created, whether or not the index returned is
|
|
/// actually used.
|
|
///
|
|
int CreateVariableSizedObject(unsigned Alignment) {
|
|
HasVarSizedObjects = true;
|
|
Objects.push_back(StackObject(0, Alignment, 0, false, false, true));
|
|
MaxAlignment = std::max(MaxAlignment, Alignment);
|
|
return (int)Objects.size()-NumFixedObjects-1;
|
|
}
|
|
|
|
/// getCalleeSavedInfo - Returns a reference to call saved info vector for the
|
|
/// current function.
|
|
const std::vector<CalleeSavedInfo> &getCalleeSavedInfo() const {
|
|
return CSInfo;
|
|
}
|
|
|
|
/// setCalleeSavedInfo - Used by prolog/epilog inserter to set the function's
|
|
/// callee saved information.
|
|
void setCalleeSavedInfo(const std::vector<CalleeSavedInfo> &CSI) {
|
|
CSInfo = CSI;
|
|
}
|
|
|
|
/// isCalleeSavedInfoValid - Has the callee saved info been calculated yet?
|
|
bool isCalleeSavedInfoValid() const { return CSIValid; }
|
|
|
|
void setCalleeSavedInfoValid(bool v) { CSIValid = v; }
|
|
|
|
/// getPristineRegs - Return a set of physical registers that are pristine on
|
|
/// entry to the MBB.
|
|
///
|
|
/// Pristine registers hold a value that is useless to the current function,
|
|
/// but that must be preserved - they are callee saved registers that have not
|
|
/// been saved yet.
|
|
///
|
|
/// Before the PrologueEpilogueInserter has placed the CSR spill code, this
|
|
/// method always returns an empty set.
|
|
BitVector getPristineRegs(const MachineBasicBlock *MBB) const;
|
|
|
|
/// print - Used by the MachineFunction printer to print information about
|
|
/// stack objects. Implemented in MachineFunction.cpp
|
|
///
|
|
void print(const MachineFunction &MF, raw_ostream &OS) const;
|
|
|
|
/// dump - Print the function to stderr.
|
|
void dump(const MachineFunction &MF) const;
|
|
};
|
|
|
|
} // End llvm namespace
|
|
|
|
#endif
|