116c29b5f285f375be53dabaa73e3e91107485fe4Anton Korobeynikov//===-- llvm/Target/TargetFrameLowering.h ---------------------------*- C++ -*-===// 234695381d626485a560594f162701088079589dfMisha Brukman// 36fbcc26f1460eaee4e0eb8b426fc1ff0c7af11beJohn Criswell// The LLVM Compiler Infrastructure 46fbcc26f1460eaee4e0eb8b426fc1ff0c7af11beJohn Criswell// 57ed47a13356daed2a34cd2209a31f92552e3bdd8Chris Lattner// This file is distributed under the University of Illinois Open Source 67ed47a13356daed2a34cd2209a31f92552e3bdd8Chris Lattner// License. See LICENSE.TXT for details. 734695381d626485a560594f162701088079589dfMisha Brukman// 86fbcc26f1460eaee4e0eb8b426fc1ff0c7af11beJohn Criswell//===----------------------------------------------------------------------===// 9035dfbe7f2d109008d2d62d9f2a67efb477a7ab6Chris Lattner// 10fd529d2e4aed9a455d539962248fda8583d6ba8eChris Lattner// Interface to describe the layout of a stack frame on the target machine. 11035dfbe7f2d109008d2d62d9f2a67efb477a7ab6Chris Lattner// 12035dfbe7f2d109008d2d62d9f2a67efb477a7ab6Chris Lattner//===----------------------------------------------------------------------===// 137cffcaaa48656fa6f90b041cc5f056304addef32Vikram S. Adve 1416c29b5f285f375be53dabaa73e3e91107485fe4Anton Korobeynikov#ifndef LLVM_TARGET_TARGETFRAMELOWERING_H 1516c29b5f285f375be53dabaa73e3e91107485fe4Anton Korobeynikov#define LLVM_TARGET_TARGETFRAMELOWERING_H 167cffcaaa48656fa6f90b041cc5f056304addef32Vikram S. Adve 17cd775ceff0b25a0b026f643a7990c2924bd310a3Anton Korobeynikov#include "llvm/CodeGen/MachineBasicBlock.h" 1809431e187f9abd45af08461df728204ee9731fd7Chris Lattner#include <utility> 19d9e3385ced2dc887e2fe8e1c071bd2611e4d3edeAnton Korobeynikov#include <vector> 2009431e187f9abd45af08461df728204ee9731fd7Chris Lattner 21d0fde30ce850b78371fd1386338350591f9ff494Brian Gaekenamespace llvm { 22cd775ceff0b25a0b026f643a7990c2924bd310a3Anton Korobeynikov class CalleeSavedInfo; 2333464912237efaa0ed7060829e66b59055bdd48bAnton Korobeynikov class MachineFunction; 2494c5ae08750f314bc3cf1bf882b686244a3927d9Anton Korobeynikov class RegScavenger; 25d0fde30ce850b78371fd1386338350591f9ff494Brian Gaeke 26c07c0df634d31849ac659234e4718b57ddacb882Chris Lattner/// Information about stack frame layout on the target. It holds the direction 27c07c0df634d31849ac659234e4718b57ddacb882Chris Lattner/// of stack growth, the known stack alignment on entry to each function, and 28c07c0df634d31849ac659234e4718b57ddacb882Chris Lattner/// the offset to the locals area. 29c07c0df634d31849ac659234e4718b57ddacb882Chris Lattner/// 30c07c0df634d31849ac659234e4718b57ddacb882Chris Lattner/// The offset to the local area is the offset from the stack pointer on 31c07c0df634d31849ac659234e4718b57ddacb882Chris Lattner/// function entry to the first location where function data (local variables, 32c07c0df634d31849ac659234e4718b57ddacb882Chris Lattner/// spill locations) can be stored. 3316c29b5f285f375be53dabaa73e3e91107485fe4Anton Korobeynikovclass TargetFrameLowering { 341fca5ff62bb2ecb5bfc8974f4dbfc56e9d3ca721Chris Lattnerpublic: 35fd529d2e4aed9a455d539962248fda8583d6ba8eChris Lattner enum StackDirection { 36fd529d2e4aed9a455d539962248fda8583d6ba8eChris Lattner StackGrowsUp, // Adding to the stack increases the stack address 37fd529d2e4aed9a455d539962248fda8583d6ba8eChris Lattner StackGrowsDown // Adding to the stack decreases the stack address 38fd529d2e4aed9a455d539962248fda8583d6ba8eChris Lattner }; 398ff95de83cbe85d939535d2f4fb5f9b2b721081aTilmann Scheller 408ff95de83cbe85d939535d2f4fb5f9b2b721081aTilmann Scheller // Maps a callee saved register to a stack slot with a fixed offset. 418ff95de83cbe85d939535d2f4fb5f9b2b721081aTilmann Scheller struct SpillSlot { 428ff95de83cbe85d939535d2f4fb5f9b2b721081aTilmann Scheller unsigned Reg; 438ff95de83cbe85d939535d2f4fb5f9b2b721081aTilmann Scheller int Offset; // Offset relative to stack pointer on function entry. 448ff95de83cbe85d939535d2f4fb5f9b2b721081aTilmann Scheller }; 45fd529d2e4aed9a455d539962248fda8583d6ba8eChris Lattnerprivate: 46fd529d2e4aed9a455d539962248fda8583d6ba8eChris Lattner StackDirection StackDir; 47fd529d2e4aed9a455d539962248fda8583d6ba8eChris Lattner unsigned StackAlignment; 480035f9c3b9982eeef098b608fceb7572df969b3eBob Wilson unsigned TransientStackAlignment; 49fd529d2e4aed9a455d539962248fda8583d6ba8eChris Lattner int LocalAreaOffset; 5069261a644298bff1497d46c8cd38d688670f307bManman Ren bool StackRealignable; 517cffcaaa48656fa6f90b041cc5f056304addef32Vikram S. Advepublic: 5216c29b5f285f375be53dabaa73e3e91107485fe4Anton Korobeynikov TargetFrameLowering(StackDirection D, unsigned StackAl, int LAO, 5369261a644298bff1497d46c8cd38d688670f307bManman Ren unsigned TransAl = 1, bool StackReal = true) 540035f9c3b9982eeef098b608fceb7572df969b3eBob Wilson : StackDir(D), StackAlignment(StackAl), TransientStackAlignment(TransAl), 5569261a644298bff1497d46c8cd38d688670f307bManman Ren LocalAreaOffset(LAO), StackRealignable(StackReal) {} 56fd529d2e4aed9a455d539962248fda8583d6ba8eChris Lattner 5716c29b5f285f375be53dabaa73e3e91107485fe4Anton Korobeynikov virtual ~TargetFrameLowering(); 58a1aad3b0eda2a516f663cb5f9f8c4c9bbb6ef224Reid Spencer 59fd529d2e4aed9a455d539962248fda8583d6ba8eChris Lattner // These methods return information that describes the abstract stack layout 60fd529d2e4aed9a455d539962248fda8583d6ba8eChris Lattner // of the target machine. 61fd529d2e4aed9a455d539962248fda8583d6ba8eChris Lattner 62fd529d2e4aed9a455d539962248fda8583d6ba8eChris Lattner /// getStackGrowthDirection - Return the direction the stack grows 63fd529d2e4aed9a455d539962248fda8583d6ba8eChris Lattner /// 64fd529d2e4aed9a455d539962248fda8583d6ba8eChris Lattner StackDirection getStackGrowthDirection() const { return StackDir; } 65fd529d2e4aed9a455d539962248fda8583d6ba8eChris Lattner 660035f9c3b9982eeef098b608fceb7572df969b3eBob Wilson /// getStackAlignment - This method returns the number of bytes to which the 670035f9c3b9982eeef098b608fceb7572df969b3eBob Wilson /// stack pointer must be aligned on entry to a function. Typically, this 680035f9c3b9982eeef098b608fceb7572df969b3eBob Wilson /// is the largest alignment for any data object in the target. 69fd529d2e4aed9a455d539962248fda8583d6ba8eChris Lattner /// 70fd529d2e4aed9a455d539962248fda8583d6ba8eChris Lattner unsigned getStackAlignment() const { return StackAlignment; } 71fd529d2e4aed9a455d539962248fda8583d6ba8eChris Lattner 720035f9c3b9982eeef098b608fceb7572df969b3eBob Wilson /// getTransientStackAlignment - This method returns the number of bytes to 730035f9c3b9982eeef098b608fceb7572df969b3eBob Wilson /// which the stack pointer must be aligned at all times, even between 740035f9c3b9982eeef098b608fceb7572df969b3eBob Wilson /// calls. 750035f9c3b9982eeef098b608fceb7572df969b3eBob Wilson /// 760035f9c3b9982eeef098b608fceb7572df969b3eBob Wilson unsigned getTransientStackAlignment() const { 770035f9c3b9982eeef098b608fceb7572df969b3eBob Wilson return TransientStackAlignment; 780035f9c3b9982eeef098b608fceb7572df969b3eBob Wilson } 790035f9c3b9982eeef098b608fceb7572df969b3eBob Wilson 8069261a644298bff1497d46c8cd38d688670f307bManman Ren /// isStackRealignable - This method returns whether the stack can be 8169261a644298bff1497d46c8cd38d688670f307bManman Ren /// realigned. 8269261a644298bff1497d46c8cd38d688670f307bManman Ren bool isStackRealignable() const { 8369261a644298bff1497d46c8cd38d688670f307bManman Ren return StackRealignable; 8469261a644298bff1497d46c8cd38d688670f307bManman Ren } 8569261a644298bff1497d46c8cd38d688670f307bManman Ren 86fd529d2e4aed9a455d539962248fda8583d6ba8eChris Lattner /// getOffsetOfLocalArea - This method returns the offset of the local area 87fd529d2e4aed9a455d539962248fda8583d6ba8eChris Lattner /// from the stack pointer on entrance to a function. 88fd529d2e4aed9a455d539962248fda8583d6ba8eChris Lattner /// 89fd529d2e4aed9a455d539962248fda8583d6ba8eChris Lattner int getOffsetOfLocalArea() const { return LocalAreaOffset; } 90fd529d2e4aed9a455d539962248fda8583d6ba8eChris Lattner 917271ac2c0318043688ddc8686dd23777dca62c59Richard Sandiford /// isFPCloseToIncomingSP - Return true if the frame pointer is close to 927271ac2c0318043688ddc8686dd23777dca62c59Richard Sandiford /// the incoming stack pointer, false if it is close to the post-prologue 937271ac2c0318043688ddc8686dd23777dca62c59Richard Sandiford /// stack pointer. 947271ac2c0318043688ddc8686dd23777dca62c59Richard Sandiford virtual bool isFPCloseToIncomingSP() const { return true; } 957271ac2c0318043688ddc8686dd23777dca62c59Richard Sandiford 96cd81d94322a39503e4a3e87b6ee03d4fcb3465fbStephen Hines /// assignCalleeSavedSpillSlots - Allows target to override spill slot 97cd81d94322a39503e4a3e87b6ee03d4fcb3465fbStephen Hines /// assignment logic. If implemented, assignCalleeSavedSpillSlots() should 98cd81d94322a39503e4a3e87b6ee03d4fcb3465fbStephen Hines /// assign frame slots to all CSI entries and return true. If this method 99cd81d94322a39503e4a3e87b6ee03d4fcb3465fbStephen Hines /// returns false, spill slots will be assigned using generic implementation. 100cd81d94322a39503e4a3e87b6ee03d4fcb3465fbStephen Hines /// assignCalleeSavedSpillSlots() may add, delete or rearrange elements of 101cd81d94322a39503e4a3e87b6ee03d4fcb3465fbStephen Hines /// CSI. 102cd81d94322a39503e4a3e87b6ee03d4fcb3465fbStephen Hines virtual bool 103cd81d94322a39503e4a3e87b6ee03d4fcb3465fbStephen Hines assignCalleeSavedSpillSlots(MachineFunction &MF, 104cd81d94322a39503e4a3e87b6ee03d4fcb3465fbStephen Hines const TargetRegisterInfo *TRI, 105cd81d94322a39503e4a3e87b6ee03d4fcb3465fbStephen Hines std::vector<CalleeSavedInfo> &CSI) const { 106cd81d94322a39503e4a3e87b6ee03d4fcb3465fbStephen Hines return false; 107cd81d94322a39503e4a3e87b6ee03d4fcb3465fbStephen Hines } 108cd81d94322a39503e4a3e87b6ee03d4fcb3465fbStephen Hines 1090098b3e2b69e527ddcf2ebad7a3081898fa3b4f0Evan Cheng /// getCalleeSavedSpillSlots - This method returns a pointer to an array of 1100098b3e2b69e527ddcf2ebad7a3081898fa3b4f0Evan Cheng /// pairs, that contains an entry for each callee saved register that must be 11109431e187f9abd45af08461df728204ee9731fd7Chris Lattner /// spilled to a particular stack location if it is spilled. 11209431e187f9abd45af08461df728204ee9731fd7Chris Lattner /// 11309431e187f9abd45af08461df728204ee9731fd7Chris Lattner /// Each entry in this array contains a <register,offset> pair, indicating the 11409431e187f9abd45af08461df728204ee9731fd7Chris Lattner /// fixed offset from the incoming stack pointer that each register should be 1158ff95de83cbe85d939535d2f4fb5f9b2b721081aTilmann Scheller /// spilled at. If a register is not listed here, the code generator is 11609431e187f9abd45af08461df728204ee9731fd7Chris Lattner /// allowed to spill it anywhere it chooses. 11734695381d626485a560594f162701088079589dfMisha Brukman /// 1188ff95de83cbe85d939535d2f4fb5f9b2b721081aTilmann Scheller virtual const SpillSlot * 1190098b3e2b69e527ddcf2ebad7a3081898fa3b4f0Evan Cheng getCalleeSavedSpillSlots(unsigned &NumEntries) const { 12009431e187f9abd45af08461df728204ee9731fd7Chris Lattner NumEntries = 0; 121dce4a407a24b04eebc6a376f8e62b41aaa7b071fStephen Hines return nullptr; 12209431e187f9abd45af08461df728204ee9731fd7Chris Lattner } 12333464912237efaa0ed7060829e66b59055bdd48bAnton Korobeynikov 12433464912237efaa0ed7060829e66b59055bdd48bAnton Korobeynikov /// targetHandlesStackFrameRounding - Returns true if the target is 12533464912237efaa0ed7060829e66b59055bdd48bAnton Korobeynikov /// responsible for rounding up the stack frame (probably at emitPrologue 12633464912237efaa0ed7060829e66b59055bdd48bAnton Korobeynikov /// time). 12733464912237efaa0ed7060829e66b59055bdd48bAnton Korobeynikov virtual bool targetHandlesStackFrameRounding() const { 12833464912237efaa0ed7060829e66b59055bdd48bAnton Korobeynikov return false; 12933464912237efaa0ed7060829e66b59055bdd48bAnton Korobeynikov } 13033464912237efaa0ed7060829e66b59055bdd48bAnton Korobeynikov 13133464912237efaa0ed7060829e66b59055bdd48bAnton Korobeynikov /// emitProlog/emitEpilog - These methods insert prolog and epilog code into 13233464912237efaa0ed7060829e66b59055bdd48bAnton Korobeynikov /// the function. 13333464912237efaa0ed7060829e66b59055bdd48bAnton Korobeynikov virtual void emitPrologue(MachineFunction &MF) const = 0; 13433464912237efaa0ed7060829e66b59055bdd48bAnton Korobeynikov virtual void emitEpilogue(MachineFunction &MF, 13533464912237efaa0ed7060829e66b59055bdd48bAnton Korobeynikov MachineBasicBlock &MBB) const = 0; 136d0c38176690e9602a93a20a43f1bd084564a8116Anton Korobeynikov 13776927d758657b3a511c73467ec5a7288795c1513Rafael Espindola /// Adjust the prologue to have the function use segmented stacks. This works 13876927d758657b3a511c73467ec5a7288795c1513Rafael Espindola /// by adding a check even before the "normal" function prologue. 13976927d758657b3a511c73467ec5a7288795c1513Rafael Espindola virtual void adjustForSegmentedStacks(MachineFunction &MF) const { } 14076927d758657b3a511c73467ec5a7288795c1513Rafael Espindola 14198fbe27ac8f0766ea94b89b8c03418131b72bea4Benjamin Kramer /// Adjust the prologue to add Erlang Run-Time System (ERTS) specific code in 14298fbe27ac8f0766ea94b89b8c03418131b72bea4Benjamin Kramer /// the assembly prologue to explicitly handle the stack. 14398fbe27ac8f0766ea94b89b8c03418131b72bea4Benjamin Kramer virtual void adjustForHiPEPrologue(MachineFunction &MF) const { } 14498fbe27ac8f0766ea94b89b8c03418131b72bea4Benjamin Kramer 145cd775ceff0b25a0b026f643a7990c2924bd310a3Anton Korobeynikov /// spillCalleeSavedRegisters - Issues instruction(s) to spill all callee 146cd775ceff0b25a0b026f643a7990c2924bd310a3Anton Korobeynikov /// saved registers and returns true if it isn't possible / profitable to do 147cd775ceff0b25a0b026f643a7990c2924bd310a3Anton Korobeynikov /// so by issuing a series of store instructions via 148cd775ceff0b25a0b026f643a7990c2924bd310a3Anton Korobeynikov /// storeRegToStackSlot(). Returns false otherwise. 149cd775ceff0b25a0b026f643a7990c2924bd310a3Anton Korobeynikov virtual bool spillCalleeSavedRegisters(MachineBasicBlock &MBB, 150cd775ceff0b25a0b026f643a7990c2924bd310a3Anton Korobeynikov MachineBasicBlock::iterator MI, 151cd775ceff0b25a0b026f643a7990c2924bd310a3Anton Korobeynikov const std::vector<CalleeSavedInfo> &CSI, 152cd775ceff0b25a0b026f643a7990c2924bd310a3Anton Korobeynikov const TargetRegisterInfo *TRI) const { 153cd775ceff0b25a0b026f643a7990c2924bd310a3Anton Korobeynikov return false; 154cd775ceff0b25a0b026f643a7990c2924bd310a3Anton Korobeynikov } 155cd775ceff0b25a0b026f643a7990c2924bd310a3Anton Korobeynikov 156cd775ceff0b25a0b026f643a7990c2924bd310a3Anton Korobeynikov /// restoreCalleeSavedRegisters - Issues instruction(s) to restore all callee 157cd775ceff0b25a0b026f643a7990c2924bd310a3Anton Korobeynikov /// saved registers and returns true if it isn't possible / profitable to do 158cd775ceff0b25a0b026f643a7990c2924bd310a3Anton Korobeynikov /// so by issuing a series of load instructions via loadRegToStackSlot(). 159cd775ceff0b25a0b026f643a7990c2924bd310a3Anton Korobeynikov /// Returns false otherwise. 160cd775ceff0b25a0b026f643a7990c2924bd310a3Anton Korobeynikov virtual bool restoreCalleeSavedRegisters(MachineBasicBlock &MBB, 161cd775ceff0b25a0b026f643a7990c2924bd310a3Anton Korobeynikov MachineBasicBlock::iterator MI, 162cd775ceff0b25a0b026f643a7990c2924bd310a3Anton Korobeynikov const std::vector<CalleeSavedInfo> &CSI, 163cd775ceff0b25a0b026f643a7990c2924bd310a3Anton Korobeynikov const TargetRegisterInfo *TRI) const { 164cd775ceff0b25a0b026f643a7990c2924bd310a3Anton Korobeynikov return false; 165cd775ceff0b25a0b026f643a7990c2924bd310a3Anton Korobeynikov } 166cd775ceff0b25a0b026f643a7990c2924bd310a3Anton Korobeynikov 167d0c38176690e9602a93a20a43f1bd084564a8116Anton Korobeynikov /// hasFP - Return true if the specified function should have a dedicated 168d0c38176690e9602a93a20a43f1bd084564a8116Anton Korobeynikov /// frame pointer register. For most targets this is true only if the function 169d0c38176690e9602a93a20a43f1bd084564a8116Anton Korobeynikov /// has variable sized allocas or if frame pointer elimination is disabled. 170d0c38176690e9602a93a20a43f1bd084564a8116Anton Korobeynikov virtual bool hasFP(const MachineFunction &MF) const = 0; 171d0c38176690e9602a93a20a43f1bd084564a8116Anton Korobeynikov 172d0c38176690e9602a93a20a43f1bd084564a8116Anton Korobeynikov /// hasReservedCallFrame - Under normal circumstances, when a frame pointer is 173d0c38176690e9602a93a20a43f1bd084564a8116Anton Korobeynikov /// not required, we reserve argument space for call sites in the function 174d0c38176690e9602a93a20a43f1bd084564a8116Anton Korobeynikov /// immediately on entry to the current function. This eliminates the need for 175d0c38176690e9602a93a20a43f1bd084564a8116Anton Korobeynikov /// add/sub sp brackets around call sites. Returns true if the call frame is 176d0c38176690e9602a93a20a43f1bd084564a8116Anton Korobeynikov /// included as part of the stack frame. 177d0c38176690e9602a93a20a43f1bd084564a8116Anton Korobeynikov virtual bool hasReservedCallFrame(const MachineFunction &MF) const { 178d0c38176690e9602a93a20a43f1bd084564a8116Anton Korobeynikov return !hasFP(MF); 179d0c38176690e9602a93a20a43f1bd084564a8116Anton Korobeynikov } 180d0c38176690e9602a93a20a43f1bd084564a8116Anton Korobeynikov 181d0c38176690e9602a93a20a43f1bd084564a8116Anton Korobeynikov /// canSimplifyCallFramePseudos - When possible, it's best to simplify the 182d0c38176690e9602a93a20a43f1bd084564a8116Anton Korobeynikov /// call frame pseudo ops before doing frame index elimination. This is 183d0c38176690e9602a93a20a43f1bd084564a8116Anton Korobeynikov /// possible only when frame index references between the pseudos won't 184d0c38176690e9602a93a20a43f1bd084564a8116Anton Korobeynikov /// need adjusting for the call frame adjustments. Normally, that's true 185d0c38176690e9602a93a20a43f1bd084564a8116Anton Korobeynikov /// if the function has a reserved call frame or a frame pointer. Some 186d0c38176690e9602a93a20a43f1bd084564a8116Anton Korobeynikov /// targets (Thumb2, for example) may have more complicated criteria, 187d0c38176690e9602a93a20a43f1bd084564a8116Anton Korobeynikov /// however, and can override this behavior. 188d0c38176690e9602a93a20a43f1bd084564a8116Anton Korobeynikov virtual bool canSimplifyCallFramePseudos(const MachineFunction &MF) const { 189d0c38176690e9602a93a20a43f1bd084564a8116Anton Korobeynikov return hasReservedCallFrame(MF) || hasFP(MF); 190d0c38176690e9602a93a20a43f1bd084564a8116Anton Korobeynikov } 191d0c38176690e9602a93a20a43f1bd084564a8116Anton Korobeynikov 19282f58740c76b42af8370247b23677a0318f6dde8Anton Korobeynikov /// getFrameIndexOffset - Returns the displacement from the frame register to 19382f58740c76b42af8370247b23677a0318f6dde8Anton Korobeynikov /// the stack frame of the specified index. 19482f58740c76b42af8370247b23677a0318f6dde8Anton Korobeynikov virtual int getFrameIndexOffset(const MachineFunction &MF, int FI) const; 19582f58740c76b42af8370247b23677a0318f6dde8Anton Korobeynikov 19682f58740c76b42af8370247b23677a0318f6dde8Anton Korobeynikov /// getFrameIndexReference - This method should return the base register 19782f58740c76b42af8370247b23677a0318f6dde8Anton Korobeynikov /// and offset used to reference a frame index location. The offset is 19882f58740c76b42af8370247b23677a0318f6dde8Anton Korobeynikov /// returned directly, and the base register is returned via FrameReg. 19982f58740c76b42af8370247b23677a0318f6dde8Anton Korobeynikov virtual int getFrameIndexReference(const MachineFunction &MF, int FI, 20082f58740c76b42af8370247b23677a0318f6dde8Anton Korobeynikov unsigned &FrameReg) const; 20194c5ae08750f314bc3cf1bf882b686244a3927d9Anton Korobeynikov 20294c5ae08750f314bc3cf1bf882b686244a3927d9Anton Korobeynikov /// processFunctionBeforeCalleeSavedScan - This method is called immediately 20394c5ae08750f314bc3cf1bf882b686244a3927d9Anton Korobeynikov /// before PrologEpilogInserter scans the physical registers used to determine 20494c5ae08750f314bc3cf1bf882b686244a3927d9Anton Korobeynikov /// what callee saved registers should be spilled. This method is optional. 20594c5ae08750f314bc3cf1bf882b686244a3927d9Anton Korobeynikov virtual void processFunctionBeforeCalleeSavedScan(MachineFunction &MF, 206dce4a407a24b04eebc6a376f8e62b41aaa7b071fStephen Hines RegScavenger *RS = nullptr) const { 20794c5ae08750f314bc3cf1bf882b686244a3927d9Anton Korobeynikov 20894c5ae08750f314bc3cf1bf882b686244a3927d9Anton Korobeynikov } 20994c5ae08750f314bc3cf1bf882b686244a3927d9Anton Korobeynikov 21094c5ae08750f314bc3cf1bf882b686244a3927d9Anton Korobeynikov /// processFunctionBeforeFrameFinalized - This method is called immediately 21194c5ae08750f314bc3cf1bf882b686244a3927d9Anton Korobeynikov /// before the specified function's frame layout (MF.getFrameInfo()) is 21294c5ae08750f314bc3cf1bf882b686244a3927d9Anton Korobeynikov /// finalized. Once the frame is finalized, MO_FrameIndex operands are 21394c5ae08750f314bc3cf1bf882b686244a3927d9Anton Korobeynikov /// replaced with direct constants. This method is optional. 21494c5ae08750f314bc3cf1bf882b686244a3927d9Anton Korobeynikov /// 2153080d23fde4981835d8a7faf46c152441fadb11fHal Finkel virtual void processFunctionBeforeFrameFinalized(MachineFunction &MF, 216dce4a407a24b04eebc6a376f8e62b41aaa7b071fStephen Hines RegScavenger *RS = nullptr) const { 21794c5ae08750f314bc3cf1bf882b686244a3927d9Anton Korobeynikov } 218700ed80d3da5e98e05ceb90e9bfb66058581a6dbEli Bendersky 219700ed80d3da5e98e05ceb90e9bfb66058581a6dbEli Bendersky /// eliminateCallFramePseudoInstr - This method is called during prolog/epilog 220700ed80d3da5e98e05ceb90e9bfb66058581a6dbEli Bendersky /// code insertion to eliminate call frame setup and destroy pseudo 221700ed80d3da5e98e05ceb90e9bfb66058581a6dbEli Bendersky /// instructions (but only if the Target is using them). It is responsible 222700ed80d3da5e98e05ceb90e9bfb66058581a6dbEli Bendersky /// for eliminating these instructions, replacing them with concrete 223700ed80d3da5e98e05ceb90e9bfb66058581a6dbEli Bendersky /// instructions. This method need only be implemented if using call frame 224700ed80d3da5e98e05ceb90e9bfb66058581a6dbEli Bendersky /// setup/destroy pseudo instructions. 225700ed80d3da5e98e05ceb90e9bfb66058581a6dbEli Bendersky /// 226700ed80d3da5e98e05ceb90e9bfb66058581a6dbEli Bendersky virtual void 227700ed80d3da5e98e05ceb90e9bfb66058581a6dbEli Bendersky eliminateCallFramePseudoInstr(MachineFunction &MF, 228700ed80d3da5e98e05ceb90e9bfb66058581a6dbEli Bendersky MachineBasicBlock &MBB, 229700ed80d3da5e98e05ceb90e9bfb66058581a6dbEli Bendersky MachineBasicBlock::iterator MI) const { 230700ed80d3da5e98e05ceb90e9bfb66058581a6dbEli Bendersky llvm_unreachable("Call Frame Pseudo Instructions do not exist on this " 231700ed80d3da5e98e05ceb90e9bfb66058581a6dbEli Bendersky "target!"); 232700ed80d3da5e98e05ceb90e9bfb66058581a6dbEli Bendersky } 2337cffcaaa48656fa6f90b041cc5f056304addef32Vikram S. Adve}; 2347cffcaaa48656fa6f90b041cc5f056304addef32Vikram S. Adve 235d0fde30ce850b78371fd1386338350591f9ff494Brian Gaeke} // End llvm namespace 236d0fde30ce850b78371fd1386338350591f9ff494Brian Gaeke 2377cffcaaa48656fa6f90b041cc5f056304addef32Vikram S. Adve#endif 238