[WebAssembly] Remove MachineFrameInfo arg from checking functions (NFC)

[aheejin]

Summary

There are several functions in the form of has*** or needs*** in
WebAssemblyFrameLowering and its MachineFrameInfo argument can be
obtained from MachineFunction so it is not necessarily has to be
passed from a caller. Also, it is more in line with other overriden
fuctions like hasBP or hasReservedCallFrame, which also take only
MachineFunction argument.

llvm/trunk/lib/Target/WebAssembly/WebAssemblyFrameLowering.h

public:
   /// Write SP back to __stack_pointer global.
   void writeSPToGlobal(unsigned SrcReg, MachineFunction &MF,
                        MachineBasicBlock &MBB,
                        MachineBasicBlock::iterator &InsertStore,
                        const DebugLoc &DL) const;
 
 private:
   bool hasBP(const MachineFunction &MF) const;
-  bool needsSP(const MachineFunction &MF, const MachineFrameInfo &MFI) const;
-  bool needsSPWriteback(const MachineFunction &MF,
-                        const MachineFrameInfo &MFI) const;
+  bool needsSP(const MachineFunction &MF) const;
+  bool needsSPWriteback(const MachineFunction &MF) const;
 };
 
 }  // end namespace llvm
 
 #endif

llvm/trunk/lib/Target/WebAssembly/WebAssemblyFrameLowering.cpp

bool WebAssemblyFrameLowering::needsPrologForEH(
   auto EHType = MF.getTarget().getMCAsmInfo()->getExceptionHandlingType();
   return EHType == ExceptionHandling::Wasm &&
          MF.getFunction().hasPersonalityFn() && MF.getFrameInfo().hasCalls();
 }
 
 /// Returns true if this function needs a local user-space stack pointer.
 /// Unlike a machine stack pointer, the wasm user stack pointer is a global
 /// variable, so it is loaded into a register in the prolog.
-bool WebAssemblyFrameLowering::needsSP(const MachineFunction &MF,
-                                       const MachineFrameInfo &MFI) const {
+bool WebAssemblyFrameLowering::needsSP(const MachineFunction &MF) const {
+  auto &MFI = MF.getFrameInfo();
   return MFI.getStackSize() || MFI.adjustsStack() || hasFP(MF) ||
          needsPrologForEH(MF);
 }
 
 /// Returns true if the local user-space stack pointer needs to be written back
 /// to __stack_pointer global by this function (this is not meaningful if
 /// needsSP is false). If false, the stack red zone can be used and only a local
 /// SP is needed.
 bool WebAssemblyFrameLowering::needsSPWriteback(
-    const MachineFunction &MF, const MachineFrameInfo &MFI) const {
-  assert(needsSP(MF, MFI));
+    const MachineFunction &MF) const {
+  auto &MFI = MF.getFrameInfo();
+  assert(needsSP(MF));
   return MFI.getStackSize() > RedZoneSize || MFI.hasCalls() ||
          MF.getFunction().hasFnAttribute(Attribute::NoRedZone);
 }
 
 void WebAssemblyFrameLowering::writeSPToGlobal(
     unsigned SrcReg, MachineFunction &MF, MachineBasicBlock &MBB,
     MachineBasicBlock::iterator &InsertStore, const DebugLoc &DL) const {
   const auto *TII = MF.getSubtarget<WebAssemblySubtarget>().getInstrInfo();
 
   const char *ES = "__stack_pointer";
   auto *SPSymbol = MF.createExternalSymbolName(ES);
   BuildMI(MBB, InsertStore, DL, TII->get(WebAssembly::SET_GLOBAL_I32))
       .addExternalSymbol(SPSymbol, WebAssemblyII::MO_SYMBOL_GLOBAL)
       .addReg(SrcReg);
 }
 
 MachineBasicBlock::iterator
 WebAssemblyFrameLowering::eliminateCallFramePseudoInstr(
     MachineFunction &MF, MachineBasicBlock &MBB,
     MachineBasicBlock::iterator I) const {
   assert(!I->getOperand(0).getImm() && (hasFP(MF) || hasBP(MF)) &&
          "Call frame pseudos should only be used for dynamic stack adjustment");
   const auto *TII = MF.getSubtarget<WebAssemblySubtarget>().getInstrInfo();
   if (I->getOpcode() == TII->getCallFrameDestroyOpcode() &&
-      needsSPWriteback(MF, MF.getFrameInfo())) {
+      needsSPWriteback(MF)) {
     DebugLoc DL = I->getDebugLoc();
     writeSPToGlobal(WebAssembly::SP32, MF, MBB, I, DL);
   }
   return MBB.erase(I);
 }
 
 void WebAssemblyFrameLowering::emitPrologue(MachineFunction &MF,
                                             MachineBasicBlock &MBB) const {
   // TODO: Do ".setMIFlag(MachineInstr::FrameSetup)" on emitted instructions
   auto &MFI = MF.getFrameInfo();
   assert(MFI.getCalleeSavedInfo().empty() &&
          "WebAssembly should not have callee-saved registers");
 
-  if (!needsSP(MF, MFI)) return;
+  if (!needsSP(MF)) return;
   uint64_t StackSize = MFI.getStackSize();
 
   const auto *TII = MF.getSubtarget<WebAssemblySubtarget>().getInstrInfo();
   auto &MRI = MF.getRegInfo();
 
   auto InsertPt = MBB.begin();
   while (InsertPt != MBB.end() && WebAssembly::isArgument(*InsertPt))
     ++InsertPt;
void WebAssemblyFrameLowering::emitPrologue(MachineFunction &MF,
   if (hasFP(MF)) {
     // Unlike most conventional targets (where FP points to the saved FP),
     // FP points to the bottom of the fixed-size locals, so we can use positive
     // offsets in load/store instructions.
     BuildMI(MBB, InsertPt, DL, TII->get(WebAssembly::COPY),
             WebAssembly::FP32)
         .addReg(WebAssembly::SP32);
   }
-  if (StackSize && needsSPWriteback(MF, MFI)) {
+  if (StackSize && needsSPWriteback(MF)) {
     writeSPToGlobal(WebAssembly::SP32, MF, MBB, InsertPt, DL);
   }
 }
 
 void WebAssemblyFrameLowering::emitEpilogue(MachineFunction &MF,
                                             MachineBasicBlock &MBB) const {
-  auto &MFI = MF.getFrameInfo();
-  uint64_t StackSize = MFI.getStackSize();
-  if (!needsSP(MF, MFI) || !needsSPWriteback(MF, MFI)) return;
+  uint64_t StackSize = MF.getFrameInfo().getStackSize();
+  if (!needsSP(MF) || !needsSPWriteback(MF)) return;
   const auto *TII = MF.getSubtarget<WebAssemblySubtarget>().getInstrInfo();
   auto &MRI = MF.getRegInfo();
   auto InsertPt = MBB.getFirstTerminator();
   DebugLoc DL;
 
   if (InsertPt != MBB.end())
     DL = InsertPt->getDebugLoc();