| //===-- WebAssemblyFrameLowering.cpp - WebAssembly Frame Lowering ----------==// |
| // |
| // The LLVM Compiler Infrastructure |
| // |
| // This file is distributed under the University of Illinois Open Source |
| // License. See LICENSE.TXT for details. |
| // |
| //===----------------------------------------------------------------------===// |
| /// |
| /// \file |
| /// \brief This file contains the WebAssembly implementation of |
| /// TargetFrameLowering class. |
| /// |
| /// On WebAssembly, there aren't a lot of things to do here. There are no |
| /// callee-saved registers to save, and no spill slots. |
| /// |
| /// The stack grows downward. |
| /// |
| //===----------------------------------------------------------------------===// |
| |
| #include "WebAssemblyFrameLowering.h" |
| #include "MCTargetDesc/WebAssemblyMCTargetDesc.h" |
| #include "WebAssemblyInstrInfo.h" |
| #include "WebAssemblyMachineFunctionInfo.h" |
| #include "WebAssemblySubtarget.h" |
| #include "WebAssemblyTargetMachine.h" |
| #include "llvm/CodeGen/MachineFrameInfo.h" |
| #include "llvm/CodeGen/MachineFunction.h" |
| #include "llvm/CodeGen/MachineInstrBuilder.h" |
| #include "llvm/CodeGen/MachineModuleInfo.h" |
| #include "llvm/CodeGen/MachineRegisterInfo.h" |
| #include "llvm/Support/Debug.h" |
| using namespace llvm; |
| |
| #define DEBUG_TYPE "wasm-frame-info" |
| |
| // TODO: Implement a red zone? |
| |
| /// Return true if the specified function should have a dedicated frame pointer |
| /// register. |
| bool WebAssemblyFrameLowering::hasFP(const MachineFunction &MF) const { |
| llvm_unreachable("TODO: implement hasFP"); |
| } |
| |
| /// 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. |
| bool WebAssemblyFrameLowering::hasReservedCallFrame( |
| const MachineFunction &MF) const { |
| return !MF.getFrameInfo()->hasVarSizedObjects(); |
| } |
| |
| void WebAssemblyFrameLowering::eliminateCallFramePseudoInstr( |
| MachineFunction &MF, MachineBasicBlock &MBB, |
| MachineBasicBlock::iterator I) const { |
| llvm_unreachable("TODO: implement eliminateCallFramePseudoInstr"); |
| } |
| |
| void WebAssemblyFrameLowering::emitPrologue(MachineFunction &MF, |
| MachineBasicBlock &MBB) const { |
| llvm_unreachable("TODO: implement emitPrologue"); |
| } |
| |
| void WebAssemblyFrameLowering::emitEpilogue(MachineFunction &MF, |
| MachineBasicBlock &MBB) const { |
| llvm_unreachable("TODO: implement emitEpilogue"); |
| } |
| |
| void WebAssemblyFrameLowering::processFunctionBeforeCalleeSavedScan( |
| MachineFunction &MF, RegScavenger *RS) const { |
| llvm_unreachable("TODO: implement processFunctionBeforeCalleeSavedScan"); |
| } |