mirror of
https://github.com/fadden/6502bench.git
synced 2024-07-31 22:29:10 +00:00
9c3422623d
Memory-mapped I/O locations can have different behavior when read vs. written. This is part 1 of a change to allow two different symbols to represent the same address, based on I/O direction. This also adds a set of address masks for systems like the Atari 2600 that map hardware addresses to multiple locations. This change updates the data structures, .sym65 file reader, project serialization, and DefSymbol editor.
242 lines
9.4 KiB
C#
242 lines
9.4 KiB
C#
/*
|
|
* Copyright 2019 faddenSoft
|
|
*
|
|
* Licensed under the Apache License, Version 2.0 (the "License");
|
|
* you may not use this file except in compliance with the License.
|
|
* You may obtain a copy of the License at
|
|
*
|
|
* http://www.apache.org/licenses/LICENSE-2.0
|
|
*
|
|
* Unless required by applicable law or agreed to in writing, software
|
|
* distributed under the License is distributed on an "AS IS" BASIS,
|
|
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
|
|
* See the License for the specific language governing permissions and
|
|
* limitations under the License.
|
|
*/
|
|
using System;
|
|
using System.Diagnostics;
|
|
|
|
namespace SourceGen {
|
|
/// <summary>
|
|
/// Symbolic representation of a value. Instances are immutable.
|
|
/// </summary>
|
|
public class Symbol {
|
|
/// <summary>
|
|
/// How was the symbol defined?
|
|
/// </summary>
|
|
public enum Source {
|
|
// These are in order of highest to lowest precedence. This matters when
|
|
// looking up a symbol by value from the symbol table, because multiple symbols
|
|
// can have the same value.
|
|
Unknown = 0,
|
|
User, // user-defined label
|
|
Project, // from project configuration file
|
|
Platform, // from platform definition file
|
|
Auto, // auto-generated label
|
|
Variable // local variable
|
|
}
|
|
|
|
/// <summary>
|
|
/// Local internal label, global internal label, or reference to an
|
|
/// external address? Constants get a separate type in case we need to
|
|
/// distinguish them from addresses.
|
|
/// </summary>
|
|
public enum Type {
|
|
Unknown = 0,
|
|
LocalOrGlobalAddr, // local symbol, may be promoted to global
|
|
GlobalAddr, // user wants this to be a global symbol
|
|
GlobalAddrExport, // global symbol that is exported to linkers
|
|
ExternalAddr, // reference to address outside program (e.g. platform sym file)
|
|
Constant // constant value
|
|
}
|
|
|
|
/// <summary>
|
|
/// True if the symbol's type is an internal label (auto or user). Will be false
|
|
/// for external addresses (including variables) and constants.
|
|
/// </summary>
|
|
public bool IsInternalLabel {
|
|
get {
|
|
return SymbolSource == Source.User || SymbolSource == Source.Auto;
|
|
}
|
|
}
|
|
|
|
/// <summary>
|
|
/// True if the symbol is a local variable.
|
|
/// </summary>
|
|
public bool IsVariable {
|
|
get {
|
|
return SymbolSource == Source.Variable;
|
|
}
|
|
}
|
|
|
|
|
|
/// <summary>
|
|
/// Label sent to assembler.
|
|
/// </summary>
|
|
public string Label { get; private set; }
|
|
|
|
/// <summary>
|
|
/// Symbol's numeric value.
|
|
/// </summary>
|
|
public int Value { get; private set; }
|
|
|
|
/// <summary>
|
|
/// Symbol origin, e.g. auto-generated or entered by user. Enum values are in
|
|
/// priority order.
|
|
/// </summary>
|
|
public Source SymbolSource { get; private set; }
|
|
|
|
/// <summary>
|
|
/// Type of symbol, e.g. local or global.
|
|
/// </summary>
|
|
public Type SymbolType { get; private set; }
|
|
|
|
/// <summary>
|
|
/// Two-character string representation of Source and Type, for display in the UI.
|
|
/// </summary>
|
|
public string SourceTypeString { get; private set; }
|
|
|
|
|
|
// No nullary constructor.
|
|
private Symbol() { }
|
|
|
|
/// <summary>
|
|
/// Constructs immutable object.
|
|
/// </summary>
|
|
/// <param name="label">Label string. Syntax assumed valid.</param>
|
|
/// <param name="value">Symbol value.</param>
|
|
/// <param name="source">User-defined, auto-generated, ?</param>
|
|
/// <param name="type">Type of symbol this is.</param>
|
|
public Symbol(string label, int value, Source source, Type type) {
|
|
Debug.Assert(!string.IsNullOrEmpty(label));
|
|
Label = label;
|
|
Value = value;
|
|
SymbolType = type;
|
|
SymbolSource = source;
|
|
|
|
// Generate SourceTypeString.
|
|
string sts;
|
|
switch (SymbolSource) {
|
|
case Source.Auto: sts = "A"; break;
|
|
case Source.User: sts = "U"; break;
|
|
case Source.Platform: sts = "P"; break;
|
|
case Source.Project: sts = "R"; break;
|
|
case Source.Variable: sts = "V"; break;
|
|
default: sts = "?"; break;
|
|
}
|
|
switch (SymbolType) {
|
|
case Type.LocalOrGlobalAddr: sts += "L"; break;
|
|
case Type.GlobalAddr: sts += "G"; break;
|
|
case Type.GlobalAddrExport: sts += "X"; break;
|
|
case Type.ExternalAddr: sts += "E"; break;
|
|
case Type.Constant: sts += "C"; break;
|
|
default: sts += "?"; break;
|
|
}
|
|
SourceTypeString = sts;
|
|
}
|
|
|
|
|
|
public override string ToString() {
|
|
return Label + "{" + SymbolSource + "," + SymbolType +
|
|
",val=$" + Value.ToString("x4") + "}";
|
|
}
|
|
|
|
public static bool operator ==(Symbol a, Symbol b) {
|
|
if (ReferenceEquals(a, b)) {
|
|
return true; // same object, or both null
|
|
}
|
|
if (ReferenceEquals(a, null) || ReferenceEquals(b, null)) {
|
|
return false; // one is null
|
|
}
|
|
// All fields must be equal. Ignore SourceTypeString, since it's generated
|
|
// from Source and Type.
|
|
return Asm65.Label.LABEL_COMPARER.Equals(a.Label, b.Label) && a.Value == b.Value &&
|
|
a.SymbolSource == b.SymbolSource && a.SymbolType == b.SymbolType;
|
|
}
|
|
public static bool operator !=(Symbol a, Symbol b) {
|
|
return !(a == b);
|
|
}
|
|
public override bool Equals(object obj) {
|
|
return obj is Symbol && this == (Symbol)obj;
|
|
}
|
|
public override int GetHashCode() {
|
|
// Convert the label to upper case before computing the hash code, so that
|
|
// symbols with "foo" and "FOO" (which are equal) have the same hash code.
|
|
return Asm65.Label.ToNormal(Label).GetHashCode() ^
|
|
Value ^ (int)SymbolType ^ (int)SymbolSource;
|
|
}
|
|
|
|
|
|
//
|
|
// Comparison function, used when sorting the symbol table.
|
|
//
|
|
|
|
public enum SymbolSortField { CombinedType, Value, Name };
|
|
|
|
public static int Compare(SymbolSortField sortField, bool isAscending,
|
|
Symbol a, Symbol b) {
|
|
// In the symbol table, only the label field is guaranteed to be unique. We
|
|
// use it as a secondary sort key when comparing the other fields.
|
|
switch (sortField) {
|
|
case SymbolSortField.CombinedType:
|
|
if (isAscending) {
|
|
int cmp = string.Compare(a.SourceTypeString, b.SourceTypeString);
|
|
if (cmp == 0) {
|
|
int aDir = 0;
|
|
int bDir = 0;
|
|
if (a is DefSymbol) {
|
|
aDir = (int)((DefSymbol)a).Direction;
|
|
}
|
|
if (b is DefSymbol) {
|
|
bDir = (int)((DefSymbol)b).Direction;
|
|
}
|
|
cmp = aDir - bDir;
|
|
}
|
|
if (cmp == 0) {
|
|
cmp = string.Compare(a.Label, b.Label);
|
|
}
|
|
return cmp;
|
|
} else {
|
|
int cmp = string.Compare(a.SourceTypeString, b.SourceTypeString);
|
|
if (cmp == 0) {
|
|
// secondary sort is always ascending, so negate
|
|
cmp = -string.Compare(a.Label, b.Label);
|
|
}
|
|
return -cmp;
|
|
}
|
|
case SymbolSortField.Value:
|
|
if (isAscending) {
|
|
int cmp;
|
|
if (a.Value < b.Value) {
|
|
cmp = -1;
|
|
} else if (a.Value > b.Value) {
|
|
cmp = 1;
|
|
} else {
|
|
cmp = string.Compare(a.Label, b.Label);
|
|
}
|
|
return cmp;
|
|
} else {
|
|
int cmp;
|
|
if (a.Value < b.Value) {
|
|
cmp = -1;
|
|
} else if (a.Value > b.Value) {
|
|
cmp = 1;
|
|
} else {
|
|
cmp = -string.Compare(a.Label, b.Label);
|
|
}
|
|
return -cmp;
|
|
}
|
|
case SymbolSortField.Name:
|
|
if (isAscending) {
|
|
return string.Compare(a.Label, b.Label);
|
|
} else {
|
|
return -string.Compare(a.Label, b.Label);
|
|
}
|
|
default:
|
|
Debug.Assert(false);
|
|
return 0;
|
|
}
|
|
}
|
|
}
|
|
}
|