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 //===- TargetCallingConv.td - Target Calling Conventions ---*- tablegen -*-===//
 //
 // Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
 // See https://llvm.org/LICENSE.txt for license information.
 // SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 //
 // This file defines the target-independent interfaces with which targets
 // describe their calling conventions.
 //
 //===----------------------------------------------------------------------===//
 
 class CCAction;
 class CallingConv;
 
 /// CCCustom - Calls a custom arg handling function.
 class CCCustom<string fn> : CCAction {
   string FuncName = fn;
 }
 
 /// CCPredicateAction - Instances of this class check some predicate, then
 /// delegate to another action if the predicate is true.
 class CCPredicateAction<CCAction A> : CCAction {
   CCAction SubAction = A;
 }
 
 /// CCIfType - If the current argument is one of the specified types, apply
 /// Action A.
 class CCIfType<list<ValueType> vts, CCAction A> : CCPredicateAction<A> {
   list<ValueType> VTs = vts;
 }
 
 /// CCIf - If the predicate matches, apply A.
 class CCIf<string predicate, CCAction A> : CCPredicateAction<A> {
   string Predicate = predicate;
 }
 
 /// CCIfByVal - If the current argument has ByVal parameter attribute, apply
 /// Action A.
 class CCIfByVal<CCAction A> : CCIf<"ArgFlags.isByVal()", A> {
 }
 
 /// CCIfPreallocated - If the current argument has Preallocated parameter attribute,
 /// apply Action A.
 class CCIfPreallocated<CCAction A> : CCIf<"ArgFlags.isPreallocated()", A> {
 }
 
 /// CCIfSwiftSelf - If the current argument has swiftself parameter attribute,
 /// apply Action A.
 class CCIfSwiftSelf<CCAction A> : CCIf<"ArgFlags.isSwiftSelf()", A> {
 }
 
 /// CCIfSwiftAsync - If the current argument has swiftasync parameter attribute,
 /// apply Action A.
 class CCIfSwiftAsync<CCAction A> : CCIf<"ArgFlags.isSwiftAsync()", A> {
 }
 
 /// CCIfSwiftError - If the current argument has swifterror parameter attribute,
 /// apply Action A.
 class CCIfSwiftError<CCAction A> : CCIf<"ArgFlags.isSwiftError()", A> {
 }
 
 /// CCIfCFGuardTarget - If the current argument has cfguardtarget parameter
 /// attribute, apply Action A.
 class CCIfCFGuardTarget<CCAction A> : CCIf<"ArgFlags.isCFGuardTarget()", A> {
 }
 
 /// CCIfConsecutiveRegs - If the current argument has InConsecutiveRegs
 /// parameter attribute, apply Action A.
 class CCIfConsecutiveRegs<CCAction A> : CCIf<"ArgFlags.isInConsecutiveRegs()", A> {
 }
 
 /// CCIfCC - Match if the current calling convention is 'CC'.
 class CCIfCC<string CC, CCAction A>
   : CCIf<!strconcat("State.getCallingConv() == ", CC), A> {}
 
 /// CCIfInReg - If this argument is marked with the 'inreg' attribute, apply
 /// the specified action.
 class CCIfInReg<CCAction A> : CCIf<"ArgFlags.isInReg()", A> {}
 
 /// CCIfNest - If this argument is marked with the 'nest' attribute, apply
 /// the specified action.
 class CCIfNest<CCAction A> : CCIf<"ArgFlags.isNest()", A> {}
 
 /// CCIfSplit - If this argument is marked with the 'split' attribute, apply
 /// the specified action.
 class CCIfSplit<CCAction A> : CCIf<"ArgFlags.isSplit()", A> {}
 
 /// CCIfSRet - If this argument is marked with the 'sret' attribute, apply
 /// the specified action.
 class CCIfSRet<CCAction A> : CCIf<"ArgFlags.isSRet()", A> {}
 
 /// CCIfVarArg - If the current function is vararg - apply the action
 class CCIfVarArg<CCAction A> : CCIf<"State.isVarArg()", A> {}
 
 /// CCIfNotVarArg - If the current function is not vararg - apply the action
 class CCIfNotVarArg<CCAction A> : CCIf<"!State.isVarArg()", A> {}
 
 /// CCIfPtrAddrSpace - If the top-level parent of the current argument has
 /// pointer type in the specified address-space.
 class CCIfPtrAddrSpace<int AS, CCAction A>
     : CCIf<"(ArgFlags.isPointer() && ArgFlags.getPointerAddrSpace() == " # AS # ")", A> {}
 
 /// CCIfPtr - If the top-level parent of the current argument had
 /// pointer type in some address-space.
 class CCIfPtr<CCAction A> : CCIf<"ArgFlags.isPointer()", A> {}
 
 /// CCAssignToReg - This action matches if there is a register in the specified
 /// list that is still available.  If so, it assigns the value to the first
 /// available register and succeeds.
 class CCAssignToReg<list<Register> regList> : CCAction {
   list<Register> RegList = regList;
 }
 
 /// CCAssignToRegWithShadow - Same as CCAssignToReg, but with list of registers
 /// which became shadowed, when some register is used.
 class CCAssignToRegWithShadow<list<Register> regList,
                               list<Register> shadowList> : CCAction {
   list<Register> RegList = regList;
   list<Register> ShadowRegList = shadowList;
 }
 
 /// CCAssignToStack - This action always matches: it assigns the value to a
 /// stack slot of the specified size and alignment on the stack.  If size is
 /// zero then the ABI size is used; if align is zero then the ABI alignment
 /// is used - these may depend on the target or subtarget.
 class CCAssignToStack<int size, int align> : CCAction {
   int Size = size;
   int Align = align;
 }
 
 /// CCAssignToStackWithShadow - Same as CCAssignToStack, but with a list of
 /// registers to be shadowed. Note that, unlike CCAssignToRegWithShadow, this
 /// shadows ALL of the registers in shadowList.
 class CCAssignToStackWithShadow<int size,
                                 int align,
                                 list<Register> shadowList> : CCAction {
   int Size = size;
   int Align = align;
   list<Register> ShadowRegList = shadowList;
 }
 
 /// CCAssignToRegAndStack - Same as CCAssignToReg, but also allocates a stack
 /// slot, when some register is used. Basically, it works like:
 /// CCIf<CCAssignToReg<regList>, CCAssignToStack<size, align>>.
 class CCAssignToRegAndStack<list<Register> regList, int size, int align>
     : CCAssignToReg<regList> {
   int Size = size;
   int Align = align;
 }
 
 /// CCPassByVal - This action always matches: it assigns the value to a stack
 /// slot to implement ByVal aggregate parameter passing. Size and alignment
 /// specify the minimum size and alignment for the stack slot.
 class CCPassByVal<int size, int align> : CCAction {
   int Size = size;
   int Align = align;
 }
 
 /// CCPromoteToType - If applied, this promotes the specified current value to
 /// the specified type.
 class CCPromoteToType<ValueType destTy> : CCAction {
   ValueType DestTy = destTy;
 }
 
 /// CCPromoteToUpperBitsInType - If applied, this promotes the specified current
 /// value to the specified type and shifts the value into the upper bits.
 class CCPromoteToUpperBitsInType<ValueType destTy> : CCAction {
   ValueType DestTy = destTy;
 }
 
 /// CCBitConvertToType - If applied, this bitconverts the specified current
 /// value to the specified type.
 class CCBitConvertToType<ValueType destTy> : CCAction {
   ValueType DestTy = destTy;
 }
 
 /// CCTruncToType - If applied, this truncates the specified current value to
 /// the specified type.
 class CCTruncToType<ValueType destTy> : CCAction {
   ValueType DestTy = destTy;
 }
 
 /// CCPassIndirect - If applied, this stores the value to stack and passes the pointer
 /// as normal argument.
 class CCPassIndirect<ValueType destTy> : CCAction {
   ValueType DestTy = destTy;
 }
 
 /// CCDelegateTo - This action invokes the specified sub-calling-convention.  It
 /// is successful if the specified CC matches.
 class CCDelegateTo<CallingConv cc> : CCAction {
   CallingConv CC = cc;
 }
 
 /// CallingConv - An instance of this is used to define each calling convention
 /// that the target supports.
 class CallingConv<list<CCAction> actions> {
   list<CCAction> Actions = actions;
 
   /// If true, this calling convention will be emitted as externally visible in
   /// the llvm namespaces instead of as a static function.
   bit Entry = false;
 
   bit Custom = false;
 }
 
 /// CustomCallingConv - An instance of this is used to declare calling
 /// conventions that are implemented using a custom function of the same name.
 class CustomCallingConv : CallingConv<[]> {
   let Custom = true;
 }
 
 /// CalleeSavedRegs - A list of callee saved registers for a given calling
 /// convention.  The order of registers is used by PrologEpilogInsertion when
 /// allocation stack slots for saved registers.
 ///
 /// For each CalleeSavedRegs def, TableGen will emit a FOO_SaveList array for
 /// returning from getCalleeSavedRegs(), and a FOO_RegMask bit mask suitable for
 /// returning from getCallPreservedMask().
 class CalleeSavedRegs<dag saves> {
   dag SaveList = saves;
 
   // Registers that are also preserved across function calls, but should not be
   // included in the generated FOO_SaveList array. These registers will be
   // included in the FOO_RegMask bit mask. This can be used for registers that
   // are saved automatically, like the SPARC register windows.
   dag OtherPreserved;
 }

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