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//===-- 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");
}
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