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Add offset to PlSymbol
It's useful for extension scripts to be able to get the file offset of symbols in non-addressable regions. One example of this is CHR ROM data for an NES cartridge. However, we were getting the offset by doing an address-to-offset mapping on the plugin side, which by definition doesn't work for non-addressable memory. So we now add the offset to PlSymbol objects for user labels and address region pre-labels. The NES visualizer has been updated to use the new field. Also, fixed a bogus complaint about bank overruns for non-addressable regions.
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@ -81,6 +81,11 @@ namespace PluginCommon {
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/// </summary>
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public string Tag { get; private set; }
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/// <summary>
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/// Symbol offset, for user labels and pre-labels; -1 otherwise.
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/// </summary>
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public int Offset { get; private set; }
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/// <summary>
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/// Nullary constructor, for deserialization.
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@ -92,14 +97,20 @@ namespace PluginCommon {
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/// </summary>
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/// <param name="label">Symbol label.</param>
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/// <param name="value">Symbol value.</param>
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/// <param name="width">Width, for platform/project symbols.</param>
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/// <param name="source">Symbol source.</param>
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/// <param name="type">Symbol type.</param>
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/// <param name="tag">Symbol group tag.</param>
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public PlSymbol(string label, int value, int width, Source source, Type type, string tag) {
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/// <param name="offset">Offset, for user labels and pre-labels; -1 otherwise.</param>
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public PlSymbol(string label, int value, int width, Source source, Type type, string tag,
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int offset) {
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Label = label;
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Value = value;
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Width = width;
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SymbolSource = source;
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SymbolType = type;
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Tag = tag;
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Offset = offset;
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}
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/// <summary>
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@ -407,6 +407,10 @@ namespace SourceGen.AsmGen {
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if (attr.Length != instrBytes) {
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// This instruction has another instruction inside it. Throw out what we
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// computed and just output as bytes.
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// TODO: in some odd situations we can split something that doesn't need
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// to be split (see note at end of #107). Working around the problem at
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// this stage is a little awkward because I think we need to check for the
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// presence of labels on one or more later lines.
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gen.GenerateShortSequence(offset, instrBytes, out opcodeStr, out operandStr);
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} else if (isPcRelBankWrap && gen.Quirks.NoPcRelBankWrap) {
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// Some assemblers have trouble generating PC-relative operands that wrap
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@ -759,7 +759,7 @@ namespace SourceGen {
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IEnumerator<AddressMap.AddressChange> addrIter = AddrMap.AddressChangeIterator;
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while (addrIter.MoveNext()) {
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AddressMap.AddressChange change = addrIter.Current;
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if (!change.IsStart) {
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if (!change.IsStart || change.Address == Address.NON_ADDR) {
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continue;
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}
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AddressMap.AddressRegion region = change.Region;
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@ -1552,46 +1552,7 @@ namespace SourceGen {
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}
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}
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// Create a mapping from label (which must be unique) to file offset. This
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// is different from UserLabels (which only has user-created labels, and is
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// sorted by offset) and SymbolTable (which has constants and platform symbols,
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// and uses the address as the value rather than the offset).
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SortedList<string, int> labelList = new SortedList<string, int>(mFileData.Length,
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Asm65.Label.LABEL_COMPARER);
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for (int offset = 0; offset < mAnattribs.Length; offset++) {
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Anattrib attr = mAnattribs[offset];
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if (attr.Symbol != null) {
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try {
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labelList.Add(attr.Symbol.Label, offset);
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} catch (ArgumentException ex) {
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// Duplicate UserLabel entries are stripped when projects are loaded, but
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// it might be possible to cause this by hiding/unhiding a label (e.g.
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// using a code start tag to place it in the middle of an instruction).
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// Just ignore the duplicate.
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Debug.WriteLine("Xref ignoring duplicate label '" + attr.Symbol.Label +
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"': " + ex.Message);
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}
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}
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}
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// Add all valid address region pre-labels. Duplicates of user labels will be
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// rejected. Note the references will appear on the line for the next file offset,
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// not the pre-label itself, because we need to associate it with a file offset.
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IEnumerator<AddressMap.AddressChange> addrIter = AddrMap.AddressChangeIterator;
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while (addrIter.MoveNext()) {
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AddressMap.AddressChange change = addrIter.Current;
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if (!change.IsStart) {
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continue;
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}
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if (change.Region.HasValidPreLabel) {
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try {
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labelList.Add(change.Region.PreLabel, change.Region.Offset);
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} catch (ArgumentException ex) {
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Debug.WriteLine("Xref ignoring pre-label duplicate '" +
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change.Region.PreLabel + "': " + ex.Message);
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}
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}
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}
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SortedList<string, int> labelList = CreateLabelToOffsetMap();
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// No particular reason to do this here, but it's convenient.
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ByteCounts.Reset();
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@ -1802,6 +1763,54 @@ namespace SourceGen {
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return xset; // will be null if not found
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}
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/// <summary>
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/// Creates a mapping from label (which must be unique) to file offset. This
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/// is different from UserLabels (which only has user-created labels, and is
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/// sorted by offset) and SymbolTable (which has constants and platform symbols,
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/// and uses the address as the value rather than the offset).
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///
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/// We use Anattribs to ensure that we only include visible labels.
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/// </summary>
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private SortedList<string, int> CreateLabelToOffsetMap() {
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SortedList<string, int> labelList = new SortedList<string, int>(mFileData.Length,
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Asm65.Label.LABEL_COMPARER);
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for (int offset = 0; offset < mAnattribs.Length; offset++) {
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Anattrib attr = mAnattribs[offset];
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if (attr.Symbol != null) {
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try {
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labelList.Add(attr.Symbol.Label, offset);
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} catch (ArgumentException ex) {
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// Duplicate UserLabel entries are stripped when projects are loaded, but
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// it might be possible to cause this by hiding/unhiding a label (e.g.
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// using a code start tag to place it in the middle of an instruction).
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// Just ignore the duplicate.
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Debug.WriteLine("Xref ignoring duplicate label '" + attr.Symbol.Label +
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"': " + ex.Message);
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}
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}
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}
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// Add all valid address region pre-labels. Duplicates of user labels will be
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// rejected. Note the references will appear on the line for the next file offset,
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// not the pre-label itself, because we need to associate it with a file offset.
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IEnumerator<AddressMap.AddressChange> addrIter = AddrMap.AddressChangeIterator;
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while (addrIter.MoveNext()) {
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AddressMap.AddressChange change = addrIter.Current;
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if (!change.IsStart) {
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continue;
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}
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if (change.Region.HasValidPreLabel) {
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try {
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labelList.Add(change.Region.PreLabel, change.Region.Offset);
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} catch (ArgumentException ex) {
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Debug.WriteLine("Xref ignoring pre-label duplicate '" +
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change.Region.PreLabel + "': " + ex.Message);
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}
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}
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}
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return labelList;
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}
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/// <summary>
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/// Replaces generic auto-labels with fancier versions generated from xrefs.
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/// </summary>
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@ -3177,7 +3177,7 @@ namespace SourceGen {
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public void GoToLabel(Symbol sym) {
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int offset = mProject.FindLabelOffsetByName(sym.Label);
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if (offset >= 0) {
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// TODO(someday): jump to correct line for address region pre-labels
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// TODO(someday): jump to symbol line, not arstart, for address region pre-labels
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GoToLocation(new NavStack.Location(offset, 0, NavStack.GoToMode.JumpToCodeData),
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true);
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} else {
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@ -115,8 +115,7 @@ namespace RuntimeData.Nintendo {
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foreach (PlSymbol sym in plSyms) {
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if (sym.Label == CHR_ROM) {
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int addr = sym.Value;
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mChrRomOffset = mAddrTrans.AddressToOffset(0, addr);
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mChrRomOffset = sym.Offset;
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break;
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}
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}
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@ -327,18 +327,51 @@ namespace SourceGen.Sandbox {
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/// <summary>
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/// Gathers a list of symbols from the project's symbol table.
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/// </summary>
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/// <remarks>
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/// Remember that we need to set this up before code analysis runs, so many of the
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/// secondary data structures (like Anattribs) won't be available.
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/// </remarks>
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private List<PlSymbol> GeneratePlSymbolList() {
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List<PlSymbol> plSymbols = new List<PlSymbol>();
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SymbolTable symTab = mProject.SymbolTable;
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// UserLabels maps offset to Symbol. Create the reverse mapping.
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Dictionary<Symbol, int> symbolOffsets =
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new Dictionary<Symbol, int>(mProject.UserLabels.Count);
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foreach (KeyValuePair<int, Symbol> kvp in mProject.UserLabels) {
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symbolOffsets[kvp.Value] = kvp.Key;
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}
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// Add in the address region pre-labels.
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IEnumerator<AddressMap.AddressChange> addrIter = mProject.AddrMap.AddressChangeIterator;
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while (addrIter.MoveNext()) {
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AddressMap.AddressChange change = addrIter.Current;
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if (!change.IsStart) {
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continue;
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}
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if (change.Region.HasValidPreLabel) {
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Symbol newSym = new Symbol(change.Region.PreLabel,
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change.Region.PreLabelAddress, Symbol.Source.AddrPreLabel,
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Symbol.Type.ExternalAddr, Symbol.LabelAnnotation.None);
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symbolOffsets[newSym] = change.Region.Offset;
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}
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}
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foreach (Symbol sym in symTab) {
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PlSymbol.Source plsSource;
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int symOff, offset = -1;
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switch (sym.SymbolSource) {
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case Symbol.Source.User:
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plsSource = PlSymbol.Source.User;
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if (symbolOffsets.TryGetValue(sym, out symOff)) {
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offset = symOff;
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}
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break;
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case Symbol.Source.AddrPreLabel:
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plsSource = PlSymbol.Source.AddrPreLabel;
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if (symbolOffsets.TryGetValue(sym, out symOff)) {
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offset = symOff;
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}
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break;
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case Symbol.Source.Project:
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plsSource = PlSymbol.Source.Project;
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@ -381,8 +414,8 @@ namespace SourceGen.Sandbox {
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tag = defSym.Tag;
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}
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plSymbols.Add(new PlSymbol(sym.Label, sym.Value, width, plsSource, plsType, tag));
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plSymbols.Add(new PlSymbol(sym.Label, sym.Value, width, plsSource, plsType, tag,
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offset));
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}
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return plSymbols;
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