+
+//===----------------------------------------------------------------------===//
+// AsmWriter - This class can be implemented by targets that need to customize
+// the format of the .s file writer.
+//
+// Subtargets can have multiple different asmwriters (e.g. AT&T vs Intel syntax
+// on X86 for example).
+//
+class AsmWriter {
+ // AsmWriterClassName - This specifies the suffix to use for the asmwriter
+ // class. Generated AsmWriter classes are always prefixed with the target
+ // name.
+ string AsmWriterClassName = "AsmPrinter";
+
+ // InstFormatName - AsmWriters can specify the name of the format string to
+ // print instructions with.
+ string InstFormatName = "AsmString";
+
+ // Variant - AsmWriters can be of multiple different variants. Variants are
+ // used to support targets that need to emit assembly code in ways that are
+ // mostly the same for different targets, but have minor differences in
+ // syntax. If the asmstring contains {|} characters in them, this integer
+ // will specify which alternative to use. For example "{x|y|z}" with Variant
+ // == 1, will expand to "y".
+ int Variant = 0;
+}
+def DefaultAsmWriter : AsmWriter;
+
+
+//===----------------------------------------------------------------------===//
+// Target - This class contains the "global" target information
+//
+class Target {
+ // CalleeSavedRegisters - As you might guess, this is a list of the callee
+ // saved registers for a target.
+ list<Register> CalleeSavedRegisters = [];
+
+ // PointerType - Specify the value type to be used to represent pointers in
+ // this target. Typically this is an i32 or i64 type.
+ ValueType PointerType;
+
+ // InstructionSet - Instruction set description for this target.
+ InstrInfo InstructionSet;
+
+ // AssemblyWriters - The AsmWriter instances available for this target.
+ list<AsmWriter> AssemblyWriters = [DefaultAsmWriter];
+}
+
+
+//===----------------------------------------------------------------------===//
+// DAG node definitions used by the instruction selector.
+//
+// NOTE: all of this is a work-in-progress and should be ignored for now.
+//
+/*
+class Expander<dag pattern, list<dag> result> {
+ dag Pattern = pattern;
+ list<dag> Result = result;
+}
+
+class DagNodeValType;
+def DNVT_any : DagNodeValType; // No constraint on tree node
+def DNVT_void : DagNodeValType; // Tree node always returns void
+def DNVT_val : DagNodeValType; // A non-void type
+def DNVT_arg0 : DagNodeValType; // Tree node returns same type as Arg0
+def DNVT_arg1 : DagNodeValType; // Tree node returns same type as Arg1
+def DNVT_ptr : DagNodeValType; // The target pointer type
+def DNVT_i8 : DagNodeValType; // Always have an i8 value
+
+class DagNode<DagNodeValType ret, list<DagNodeValType> args> {
+ DagNodeValType RetType = ret;
+ list<DagNodeValType> ArgTypes = args;
+ string EnumName = ?;
+}
+
+// BuiltinDagNodes are built into the instruction selector and correspond to
+// enum values.
+class BuiltinDagNode<DagNodeValType Ret, list<DagNodeValType> Args,
+ string Ename> : DagNode<Ret, Args> {
+ let EnumName = Ename;
+}
+
+// Magic nodes...
+def Void : RegisterClass<isVoid,0,[]> { let isDummyClass = 1; }
+def set : DagNode<DNVT_void, [DNVT_val, DNVT_arg0]>;
+def chain : BuiltinDagNode<DNVT_void, [DNVT_void, DNVT_void], "ChainNode">;
+def blockchain : BuiltinDagNode<DNVT_void, [DNVT_void, DNVT_void],
+ "BlockChainNode">;
+def ChainExpander : Expander<(chain Void, Void), []>;
+def BlockChainExpander : Expander<(blockchain Void, Void), []>;
+
+
+// Terminals...
+def imm : BuiltinDagNode<DNVT_val, [], "Constant">;
+def frameidx : BuiltinDagNode<DNVT_ptr, [], "FrameIndex">;
+def basicblock : BuiltinDagNode<DNVT_ptr, [], "BasicBlock">;
+
+// Arithmetic...
+def plus : BuiltinDagNode<DNVT_arg0, [DNVT_arg1, DNVT_arg0], "Plus">;
+def minus : BuiltinDagNode<DNVT_arg0, [DNVT_arg1, DNVT_arg0], "Minus">;
+def times : BuiltinDagNode<DNVT_arg0, [DNVT_arg1, DNVT_arg0], "Times">;
+def sdiv : BuiltinDagNode<DNVT_arg0, [DNVT_arg1, DNVT_arg0], "SDiv">;
+def udiv : BuiltinDagNode<DNVT_arg0, [DNVT_arg1, DNVT_arg0], "UDiv">;
+def srem : BuiltinDagNode<DNVT_arg0, [DNVT_arg1, DNVT_arg0], "SRem">;
+def urem : BuiltinDagNode<DNVT_arg0, [DNVT_arg1, DNVT_arg0], "URem">;
+def and : BuiltinDagNode<DNVT_arg0, [DNVT_arg1, DNVT_arg0], "And">;
+def or : BuiltinDagNode<DNVT_arg0, [DNVT_arg1, DNVT_arg0], "Or">;
+def xor : BuiltinDagNode<DNVT_arg0, [DNVT_arg1, DNVT_arg0], "Xor">;
+
+// Comparisons...
+def seteq : BuiltinDagNode<DNVT_i8 , [DNVT_arg1, DNVT_arg0], "SetEQ">;
+def setne : BuiltinDagNode<DNVT_i8 , [DNVT_arg1, DNVT_arg0], "SetNE">;
+def setlt : BuiltinDagNode<DNVT_i8 , [DNVT_arg1, DNVT_arg0], "SetLT">;
+def setle : BuiltinDagNode<DNVT_i8 , [DNVT_arg1, DNVT_arg0], "SetLE">;
+def setgt : BuiltinDagNode<DNVT_i8 , [DNVT_arg1, DNVT_arg0], "SetGT">;
+def setge : BuiltinDagNode<DNVT_i8 , [DNVT_arg1, DNVT_arg0], "SetGE">;
+
+def load : BuiltinDagNode<DNVT_val, [DNVT_ptr], "Load">;
+//def store : BuiltinDagNode<DNVT_Void, [DNVT_ptr, DNVT_val]>;
+
+// Other...
+def ret : BuiltinDagNode<DNVT_void, [DNVT_val], "Ret">;
+def retvoid : BuiltinDagNode<DNVT_void, [], "RetVoid">;
+def br : BuiltinDagNode<DNVT_void, [DNVT_ptr], "Br">;
+def brcond : BuiltinDagNode<DNVT_void, [DNVT_i8, DNVT_ptr, DNVT_ptr],
+ "BrCond">;
+
+def unspec1 : BuiltinDagNode<DNVT_any , [DNVT_val], "Unspec1">;
+def unspec2 : BuiltinDagNode<DNVT_any , [DNVT_val, DNVT_val], "Unspec2">;
+
+//===----------------------------------------------------------------------===//
+// DAG nonterminals definitions used by the instruction selector...
+//
+class Nonterminal<dag pattern> {
+ dag Pattern = pattern;
+ bit BuiltIn = 0;
+}
+
+*/