#include "Target/WebAssembly/WebAssemblyFrameLowering.h"
Public Member Functions | |
| WebAssemblyFrameLowering () | |
| MachineBasicBlock::iterator | eliminateCallFramePseudoInstr (MachineFunction &MF, MachineBasicBlock &MBB, MachineBasicBlock::iterator I) const override |
| This method is called during prolog/epilog code insertion to eliminate call frame setup and destroy pseudo instructions (but only if the Target is using them). More... | |
| void | emitPrologue (MachineFunction &MF, MachineBasicBlock &MBB) const override |
| These methods insert prolog and epilog code into the function. More... | |
| void | emitEpilogue (MachineFunction &MF, MachineBasicBlock &MBB) const override |
| bool | hasFP (const MachineFunction &MF) const override |
| Return true if the specified function should have a dedicated frame pointer register. More... | |
| bool | hasReservedCallFrame (const MachineFunction &MF) const override |
| Under normal circumstances, when a frame pointer is not required, we reserve argument space for call sites in the function immediately on entry to the current function. More... | |
| bool | needsPrologForEH (const MachineFunction &MF) const |
| void | writeSPToGlobal (unsigned SrcReg, MachineFunction &MF, MachineBasicBlock &MBB, MachineBasicBlock::iterator &InsertStore, const DebugLoc &DL) const |
| Write SP back to __stack_pointer global. More... | |
 Public Member Functions inherited from llvm::TargetFrameLowering | |
| TargetFrameLowering (StackDirection D, unsigned StackAl, int LAO, unsigned TransAl=1, bool StackReal=true) | |
| virtual | ~TargetFrameLowering () |
| StackDirection | getStackGrowthDirection () const |
| getStackGrowthDirection - Return the direction the stack grows More... | |
| unsigned | getStackAlignment () const |
| getStackAlignment - This method returns the number of bytes to which the stack pointer must be aligned on entry to a function. More... | |
| int | alignSPAdjust (int SPAdj) const |
| alignSPAdjust - This method aligns the stack adjustment to the correct alignment. More... | |
| unsigned | getTransientStackAlignment () const |
| getTransientStackAlignment - This method returns the number of bytes to which the stack pointer must be aligned at all times, even between calls. More... | |
| bool | isStackRealignable () const |
| isStackRealignable - This method returns whether the stack can be realigned. More... | |
| virtual unsigned | getStackAlignmentSkew (const MachineFunction &MF) const |
| Return the skew that has to be applied to stack alignment under certain conditions (e.g. More... | |
| int | getOffsetOfLocalArea () const |
| getOffsetOfLocalArea - This method returns the offset of the local area from the stack pointer on entrance to a function. More... | |
| virtual bool | isFPCloseToIncomingSP () const |
| isFPCloseToIncomingSP - Return true if the frame pointer is close to the incoming stack pointer, false if it is close to the post-prologue stack pointer. More... | |
| virtual bool | assignCalleeSavedSpillSlots (MachineFunction &MF, const TargetRegisterInfo *TRI, std::vector< CalleeSavedInfo > &CSI) const |
| assignCalleeSavedSpillSlots - Allows target to override spill slot assignment logic. More... | |
| virtual const SpillSlot * | getCalleeSavedSpillSlots (unsigned &NumEntries) const |
| getCalleeSavedSpillSlots - This method returns a pointer to an array of pairs, that contains an entry for each callee saved register that must be spilled to a particular stack location if it is spilled. More... | |
| virtual bool | targetHandlesStackFrameRounding () const |
| targetHandlesStackFrameRounding - Returns true if the target is responsible for rounding up the stack frame (probably at emitPrologue time). More... | |
| virtual bool | enableShrinkWrapping (const MachineFunction &MF) const |
| Returns true if the target will correctly handle shrink wrapping. More... | |
| virtual bool | enableStackSlotScavenging (const MachineFunction &MF) const |
| Returns true if the stack slot holes in the fixed and callee-save stack area should be used when allocating other stack locations to reduce stack size. More... | |
| virtual bool | enableCalleeSaveSkip (const MachineFunction &MF) const |
| Returns true if the target can safely skip saving callee-saved registers for noreturn nounwind functions. More... | |
| virtual void | inlineStackProbe (MachineFunction &MF, MachineBasicBlock &PrologueMBB) const |
| Replace a StackProbe stub (if any) with the actual probe code inline. More... | |
| virtual void | adjustForSegmentedStacks (MachineFunction &MF, MachineBasicBlock &PrologueMBB) const |
| Adjust the prologue to have the function use segmented stacks. More... | |
| virtual void | adjustForHiPEPrologue (MachineFunction &MF, MachineBasicBlock &PrologueMBB) const |
| Adjust the prologue to add Erlang Run-Time System (ERTS) specific code in the assembly prologue to explicitly handle the stack. More... | |
| virtual bool | spillCalleeSavedRegisters (MachineBasicBlock &MBB, MachineBasicBlock::iterator MI, const std::vector< CalleeSavedInfo > &CSI, const TargetRegisterInfo *TRI) const |
| spillCalleeSavedRegisters - Issues instruction(s) to spill all callee saved registers and returns true if it isn't possible / profitable to do so by issuing a series of store instructions via storeRegToStackSlot(). More... | |
| virtual bool | restoreCalleeSavedRegisters (MachineBasicBlock &MBB, MachineBasicBlock::iterator MI, std::vector< CalleeSavedInfo > &CSI, const TargetRegisterInfo *TRI) const |
| restoreCalleeSavedRegisters - Issues instruction(s) to restore all callee saved registers and returns true if it isn't possible / profitable to do so by issuing a series of load instructions via loadRegToStackSlot(). More... | |
| virtual bool | keepFramePointer (const MachineFunction &MF) const |
| Return true if the target wants to keep the frame pointer regardless of the function attribute "frame-pointer". More... | |
| virtual bool | canSimplifyCallFramePseudos (const MachineFunction &MF) const |
| canSimplifyCallFramePseudos - When possible, it's best to simplify the call frame pseudo ops before doing frame index elimination. More... | |
| virtual bool | needsFrameIndexResolution (const MachineFunction &MF) const |
| virtual int | getFrameIndexReference (const MachineFunction &MF, int FI, unsigned &FrameReg) const |
| getFrameIndexReference - This method should return the base register and offset used to reference a frame index location. More... | |
| virtual int | getFrameIndexReferencePreferSP (const MachineFunction &MF, int FI, unsigned &FrameReg, bool IgnoreSPUpdates) const |
Same as getFrameIndexReference, except that the stack pointer (as opposed to the frame pointer) will be the preferred value for FrameReg. More... | |
| virtual void | determineCalleeSaves (MachineFunction &MF, BitVector &SavedRegs, RegScavenger *RS=nullptr) const |
| This method determines which of the registers reported by TargetRegisterInfo::getCalleeSavedRegs() should actually get saved. More... | |
| virtual void | processFunctionBeforeFrameFinalized (MachineFunction &MF, RegScavenger *RS=nullptr) const |
| processFunctionBeforeFrameFinalized - This method is called immediately before the specified function's frame layout (MF.getFrameInfo()) is finalized. More... | |
| virtual unsigned | getWinEHParentFrameOffset (const MachineFunction &MF) const |
| virtual void | orderFrameObjects (const MachineFunction &MF, SmallVectorImpl< int > &objectsToAllocate) const |
| Order the symbols in the local stack frame. More... | |
| virtual bool | canUseAsPrologue (const MachineBasicBlock &MBB) const |
Check whether or not the given MBB can be used as a prologue for the target. More... | |
| virtual bool | canUseAsEpilogue (const MachineBasicBlock &MBB) const |
Check whether or not the given MBB can be used as a epilogue for the target. More... | |
| virtual int | getInitialCFAOffset (const MachineFunction &MF) const |
| Return initial CFA offset value i.e. More... | |
| virtual unsigned | getInitialCFARegister (const MachineFunction &MF) const |
| Return initial CFA register value i.e. More... | |
Static Public Attributes | |
| static const size_t | RedZoneSize = 128 |
| Size of the red zone for the user stack (leaf functions can use this much space below the stack pointer without writing it back to __stack_pointer global). More... | |
Additional Inherited Members | |
| Public Types inherited from llvm::TargetFrameLowering | |
| enum | StackDirection { StackGrowsUp, StackGrowsDown } |
| Static Public Member Functions inherited from llvm::TargetFrameLowering | |
| static bool | isSafeForNoCSROpt (const Function &F) |
| Check if given function is safe for not having callee saved registers. More... | |
Detailed Description
Definition at line 24 of file WebAssemblyFrameLowering.h.
Constructor & Destructor Documentation
◆ WebAssemblyFrameLowering()
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inline |
Definition at line 32 of file WebAssemblyFrameLowering.h.
References eliminateCallFramePseudoInstr(), emitEpilogue(), emitPrologue(), hasFP(), hasReservedCallFrame(), I, needsPrologForEH(), and writeSPToGlobal().
Member Function Documentation
◆ eliminateCallFramePseudoInstr()
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overridevirtual |
This method is called during prolog/epilog code insertion to eliminate call frame setup and destroy pseudo instructions (but only if the Target is using them).
It is responsible for eliminating these instructions, replacing them with concrete instructions. This method need only be implemented if using call frame setup/destroy pseudo instructions. Returns an iterator pointing to the instruction after the replaced one.
Reimplemented from llvm::TargetFrameLowering.
Definition at line 139 of file WebAssemblyFrameLowering.cpp.
References assert(), llvm::MachineBasicBlock::erase(), llvm::MachineFunction::getSubtarget(), hasFP(), TII, and writeSPToGlobal().
Referenced by WebAssemblyFrameLowering().
◆ emitEpilogue()
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overridevirtual |
Implements llvm::TargetFrameLowering.
Definition at line 225 of file WebAssemblyFrameLowering.cpp.
References llvm::BuildMI(), llvm::MachineBasicBlock::end(), llvm::MachineBasicBlock::getFirstTerminator(), llvm::MachineFunction::getFrameInfo(), llvm::MachineFunction::getInfo(), llvm::MachineFunction::getRegInfo(), llvm::MachineFrameInfo::getStackSize(), llvm::MachineFunction::getSubtarget(), hasFP(), MRI, TII, and writeSPToGlobal().
Referenced by WebAssemblyFrameLowering().
◆ emitPrologue()
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overridevirtual |
These methods insert prolog and epilog code into the function.
Implements llvm::TargetFrameLowering.
Definition at line 153 of file WebAssemblyFrameLowering.cpp.
References llvm::MachineInstrBuilder::addReg(), assert(), llvm::MachineBasicBlock::begin(), llvm::BuildMI(), llvm::countTrailingZeros(), llvm::MachineFunction::createExternalSymbolName(), llvm::MachineBasicBlock::end(), llvm::MachineFunction::getFrameInfo(), llvm::MachineFunction::getInfo(), llvm::MachineFunction::getRegInfo(), llvm::MachineFunction::getSubtarget(), hasFP(), llvm::WebAssembly::isArgument(), llvm::WebAssemblyII::MO_SYMBOL_GLOBAL, MRI, TII, and writeSPToGlobal().
Referenced by WebAssemblyFrameLowering().
◆ hasFP()
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overridevirtual |
Return true if the specified function should have a dedicated frame pointer register.
Implements llvm::TargetFrameLowering.
Definition at line 54 of file WebAssemblyFrameLowering.cpp.
References llvm::MachineFunction::getFrameInfo(), llvm::MachineFrameInfo::getStackSize(), llvm::MachineFrameInfo::hasPatchPoint(), llvm::MachineFrameInfo::hasStackMap(), llvm::MachineFrameInfo::hasVarSizedObjects(), and llvm::MachineFrameInfo::isFrameAddressTaken().
Referenced by eliminateCallFramePseudoInstr(), emitEpilogue(), emitPrologue(), llvm::WebAssemblyRegisterInfo::getFrameRegister(), hasReservedCallFrame(), and WebAssemblyFrameLowering().
◆ hasReservedCallFrame()
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overridevirtual |
Under normal circumstances, when a frame pointer is not required, we reserve argument space for call sites in the function immediately on entry to the current function.
This eliminates the need for add/sub sp brackets around call sites. Returns true if the call frame is included as part of the stack frame.
Reimplemented from llvm::TargetFrameLowering.
Definition at line 76 of file WebAssemblyFrameLowering.cpp.
References llvm::MachineFunction::getFrameInfo(), llvm::MachineFrameInfo::getStackSize(), hasFP(), and llvm::MachineFrameInfo::hasVarSizedObjects().
Referenced by WebAssemblyFrameLowering().
◆ needsPrologForEH()
| bool WebAssemblyFrameLowering::needsPrologForEH | ( | const MachineFunction & | MF | ) | const |
Definition at line 92 of file WebAssemblyFrameLowering.cpp.
References assert(), llvm::MCAsmInfo::getExceptionHandlingType(), llvm::MachineFunction::getFrameInfo(), llvm::MachineFunction::getFunction(), llvm::TargetMachine::getMCAsmInfo(), llvm::MachineFunction::getTarget(), llvm::MachineFrameInfo::hasCalls(), llvm::Function::hasFnAttribute(), llvm::Function::hasPersonalityFn(), llvm::Attribute::NoRedZone, RedZoneSize, and llvm::Wasm.
Referenced by WebAssemblyFrameLowering().
◆ writeSPToGlobal()
| void WebAssemblyFrameLowering::writeSPToGlobal | ( | unsigned | SrcReg, |
| MachineFunction & | MF, | ||
| MachineBasicBlock & | MBB, | ||
| MachineBasicBlock::iterator & | InsertStore, | ||
| const DebugLoc & | DL | ||
| ) | const |
Write SP back to __stack_pointer global.
Definition at line 126 of file WebAssemblyFrameLowering.cpp.
References llvm::MachineInstrBuilder::addReg(), llvm::BuildMI(), llvm::MachineFunction::createExternalSymbolName(), llvm::MachineFunction::getSubtarget(), llvm::WebAssemblyII::MO_SYMBOL_GLOBAL, and TII.
Referenced by eliminateCallFramePseudoInstr(), emitEpilogue(), emitPrologue(), and WebAssemblyFrameLowering().
Member Data Documentation
◆ RedZoneSize
Size of the red zone for the user stack (leaf functions can use this much space below the stack pointer without writing it back to __stack_pointer global).
Definition at line 30 of file WebAssemblyFrameLowering.h.
Referenced by needsPrologForEH().
The documentation for this class was generated from the following files:
- lib/Target/WebAssembly/WebAssemblyFrameLowering.h
- lib/Target/WebAssembly/WebAssemblyFrameLowering.cpp
