mirror of
https://github.com/zellyn/go6502.git
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7a9a0cb41f
- Renamed "oldschool" to "common" - plan to base as65 and acme on it too. - Renamed opcode.Flavor to opcode.Set - too many uses of the word "flavor". - First implementation of as65: simply based it on common core. No tests yet demonstrate that that is incorrect :-)
96 lines
2.6 KiB
Go
96 lines
2.6 KiB
Go
package as65
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import (
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"fmt"
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"github.com/zellyn/go6502/asm/context"
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"github.com/zellyn/go6502/asm/expr"
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"github.com/zellyn/go6502/asm/flavors/common"
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"github.com/zellyn/go6502/asm/inst"
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"github.com/zellyn/go6502/asm/lines"
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"github.com/zellyn/go6502/opcodes"
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)
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// As65 implements an as65-compatible assembler flavor.
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type As65 struct {
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common.Base
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}
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func New(sets opcodes.Set) *As65 {
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a := &As65{}
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a.Name = "as65"
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a.OpcodesByName = opcodes.ByName(sets)
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a.LabelChars = common.Letters + common.Digits + "."
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a.LabelColons = common.ReqOptional
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a.ExplicitARegister = common.ReqRequired
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a.StringEndOptional = true
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a.CommentChar = ';'
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a.MsbChars = "/"
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a.ImmediateChars = "#"
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a.HexCommas = common.ReqOptional
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a.DefaultOriginVal = 0x0800
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a.Directives = map[string]common.DirectiveInfo{
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"ORG": {inst.TypeOrg, a.ParseOrg, 0},
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"OBJ": {inst.TypeNone, nil, 0},
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"ENDASM": {inst.TypeEnd, a.ParseNoArgDir, 0},
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"EQU": {inst.TypeEqu, a.ParseEquate, inst.VarEquNormal},
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"EPZ": {inst.TypeEqu, a.ParseEquate, inst.VarEquPageZero},
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"DFB": {inst.TypeData, a.ParseData, inst.VarBytes},
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"DW": {inst.TypeData, a.ParseData, inst.VarWordsLe},
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"DDB": {inst.TypeData, a.ParseData, inst.VarWordsBe},
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"ASC": {inst.TypeData, a.ParseAscii, inst.VarAscii},
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"DCI": {inst.TypeData, a.ParseAscii, inst.VarAsciiFlip},
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"HEX": {inst.TypeData, a.ParseHexString, inst.VarBytes},
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"PAGE": {inst.TypeNone, nil, 0}, // New page
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"TITLE": {inst.TypeNone, nil, 0}, // Title
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"SBTL": {inst.TypeNone, nil, 0}, // Subtitle
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"SKP": {inst.TypeNone, nil, 0}, // Skip lines
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"REP": {inst.TypeNone, nil, 0}, // Repeat character
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"CHR": {inst.TypeNone, nil, 0}, // Set repeated character
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}
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a.EquateDirectives = map[string]bool{
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"EQU": true,
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"EPZ": true,
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}
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a.Operators = map[string]expr.Operator{
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"*": expr.OpMul,
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"/": expr.OpDiv,
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"+": expr.OpPlus,
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"-": expr.OpMinus,
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"<": expr.OpLt,
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">": expr.OpGt,
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"=": expr.OpEq,
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}
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a.InitContextFunc = func(ctx context.Context) {
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ctx.SetOnOffDefaults(map[string]bool{
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"MSB": true, // MSB defaults to true, as per manual
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"LST": true, // Display listing: not used
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})
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}
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a.SetAsciiVariation = func(ctx context.Context, in *inst.I, lp *lines.Parse) {
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if in.Command == "ASC" {
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if ctx.Setting("MSB") {
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in.Var = inst.VarAsciiHi
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} else {
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in.Var = inst.VarAscii
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}
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return
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}
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if in.Command == "DCI" {
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in.Var = inst.VarAsciiFlip
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} else {
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panic(fmt.Sprintf("Unknown ascii directive: '%s'", in.Command))
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}
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}
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a.FixLabel = a.DefaultFixLabel
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a.IsNewParentLabel = a.DefaultIsNewParentLabel
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return a
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}
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