75 lines
2.8 KiB
C++
75 lines
2.8 KiB
C++
//===-- WebAssemblyFrameLowering.cpp - WebAssembly Frame Lowering ----------==//
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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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/// \file
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/// \brief This file contains the WebAssembly implementation of
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/// TargetFrameLowering class.
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///
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/// On WebAssembly, there aren't a lot of things to do here. There are no
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/// callee-saved registers to save, and no spill slots.
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///
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/// The stack grows downward.
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///
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//===----------------------------------------------------------------------===//
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#include "WebAssemblyFrameLowering.h"
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#include "MCTargetDesc/WebAssemblyMCTargetDesc.h"
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#include "WebAssemblyInstrInfo.h"
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#include "WebAssemblyMachineFunctionInfo.h"
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#include "WebAssemblySubtarget.h"
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#include "WebAssemblyTargetMachine.h"
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#include "llvm/CodeGen/MachineFrameInfo.h"
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#include "llvm/CodeGen/MachineFunction.h"
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#include "llvm/CodeGen/MachineInstrBuilder.h"
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#include "llvm/CodeGen/MachineModuleInfo.h"
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#include "llvm/CodeGen/MachineRegisterInfo.h"
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#include "llvm/Support/Debug.h"
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using namespace llvm;
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#define DEBUG_TYPE "wasm-frame-info"
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// TODO: Implement a red zone?
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/// Return true if the specified function should have a dedicated frame pointer
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/// register.
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bool WebAssemblyFrameLowering::hasFP(const MachineFunction &MF) const {
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const MachineFrameInfo *MFI = MF.getFrameInfo();
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const auto *RegInfo =
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MF.getSubtarget<WebAssemblySubtarget>().getRegisterInfo();
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return MFI->hasCalls() || MFI->hasVarSizedObjects() ||
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MFI->isFrameAddressTaken() || MFI->hasStackMap() ||
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MFI->hasPatchPoint() || RegInfo->needsStackRealignment(MF);
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}
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/// Under normal circumstances, when a frame pointer is not required, we reserve
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/// argument space for call sites in the function immediately on entry to the
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/// current function. This eliminates the need for add/sub sp brackets around
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/// call sites. Returns true if the call frame is included as part of the stack
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/// frame.
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bool WebAssemblyFrameLowering::hasReservedCallFrame(
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const MachineFunction &MF) const {
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return !MF.getFrameInfo()->hasVarSizedObjects();
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}
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void WebAssemblyFrameLowering::eliminateCallFramePseudoInstr(
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MachineFunction &MF, MachineBasicBlock &MBB,
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MachineBasicBlock::iterator I) const {
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llvm_unreachable("TODO: implement eliminateCallFramePseudoInstr");
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}
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void WebAssemblyFrameLowering::emitPrologue(MachineFunction &MF,
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MachineBasicBlock &MBB) const {
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// FIXME: Implement WebAssemblyFrameLowering::emitPrologue.
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}
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void WebAssemblyFrameLowering::emitEpilogue(MachineFunction &MF,
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MachineBasicBlock &MBB) const {
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llvm_unreachable("TODO: implement emitEpilogue");
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}
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