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b18e7bdac8
Summary: Add a basic CodeGen bitcode test which (for now) only prints out the function name and nothing else. The current code merely implements the basic needed for the test run to not crash / assert. Getting to that point required: - Basic InstPrinter. - Basic AsmPrinter. - DiagnosticInfoUnsupported (not strictly required, but nice to have, duplicated from AMDGPU/BPF's ISelLowering). - Some SP and register setup in WebAssemblyTargetLowering. - Basic LowerFormalArguments. - GenInstrInfo. - Placeholder LowerFormalArguments. - Placeholder CanLowerReturn and LowerReturn. - Basic DAGToDAGISel::Select, which requiresGenDAGISel.inc as well as GET_INSTRINFO_ENUM with GenInstrInfo.inc. - Remove WebAssemblyFrameLowering::determineCalleeSaves and rely on default. - Implement WebAssemblyFrameLowering::hasFP, same as AArch64's implementation. Follow-up patches will implement a real AsmPrinter, which will require adding MI opcodes specific to WebAssembly. Reviewers: sunfish Subscribers: aemerson, jfb, llvm-commits Differential Revision: http://reviews.llvm.org/D11369 git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@242939 91177308-0d34-0410-b5e6-96231b3b80d8
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 = static_cast<const WebAssemblyRegisterInfo *>(
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MF.getSubtarget().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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