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AssemblyWriter.cs
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using System;
using System.Collections.Generic;
using System.Diagnostics;
using System.Globalization;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
using UndertaleModLib.Decompiler;
using UndertaleModLib.Models;
using static UndertaleModLib.Models.UndertaleInstruction;
namespace UndertaleModLib.Compiler
{
public static partial class Compiler
{
public static class AssemblyWriter
{
public class CodeWriter
{
public CompileContext compileContext;
public List<UndertaleInstruction> instructions;
public uint offset = 0;
public Stack<DataType> typeStack = new Stack<DataType>();
public Stack<LoopContext> loopContexts = new Stack<LoopContext>();
public Stack<OtherContext> otherContexts = new Stack<OtherContext>();
public List<string> ErrorMessages = new List<string>();
public List<VariablePatch> varPatches = new List<VariablePatch>();
public List<FunctionPatch> funcPatches = new List<FunctionPatch>();
public List<StringPatch> stringPatches = new List<StringPatch>();
public CodeWriter(CompileContext context)
{
compileContext = context;
instructions = new List<UndertaleInstruction>(128);
offset = 0;
}
public UndertaleInstruction Emit(Opcode opcode)
{
var res = new UndertaleInstruction()
{
Kind = opcode,
Address = offset
};
instructions.Add(res);
offset += res.CalculateInstructionSize();
return res;
}
public UndertaleInstruction Emit(Opcode opcode, DataType type1)
{
var res = new UndertaleInstruction()
{
Kind = opcode,
Address = offset,
Type1 = type1
};
instructions.Add(res);
offset += res.CalculateInstructionSize();
return res;
}
public UndertaleInstruction Emit(Opcode opcode, DataType type1, DataType type2)
{
var res = new UndertaleInstruction()
{
Kind = opcode,
Address = offset,
Type1 = type1,
Type2 = type2
};
instructions.Add(res);
offset += res.CalculateInstructionSize();
return res;
}
public UndertaleInstruction EmitRef(Opcode opcode, DataType type1)
{
var res = new UndertaleInstruction()
{
Kind = opcode,
Address = offset,
Type1 = type1
};
instructions.Add(res);
offset += 2;
return res;
}
public UndertaleInstruction EmitRef(Opcode opcode, DataType type1, DataType type2)
{
var res = new UndertaleInstruction()
{
Kind = opcode,
Address = offset,
Type1 = type1,
Type2 = type2
};
instructions.Add(res);
offset += 2;
return res;
}
public List<UndertaleInstruction> Finish()
{
bool defineArguments = true;
if (compileContext.OriginalCode != null)
{
UndertaleCodeLocals locals = compileContext.Data?.CodeLocals.For(compileContext.OriginalCode);
if (locals != null)
{
// Update the code locals of the UndertaleCode
defineArguments = false;
// First, remove unnecessary locals
for (int i = 1; i < locals.Locals.Count; i++)
{
string localName = locals.Locals[i].Name.Content;
if (CompileContext.GMS2_3 != true)
locals.Locals[i].Index = (uint)i;
if (!compileContext.LocalVars.ContainsKey(localName))
{
locals.Locals.RemoveAt(i--);
compileContext.OriginalCode.LocalsCount--;
}
}
// Now add in the ones we are actually using that don't already exist
bool hasLocal(string name)
{
foreach (var l in locals.Locals)
{
if (name == l.Name.Content)
return true;
}
return false;
}
compileContext.MainThreadDelegate.Invoke(() =>
{
var variables = compileContext.Data?.Variables;
foreach (var l in compileContext.LocalVars)
{
string name = l.Key;
if (!hasLocal(name))
{
if (variables != null && CompileContext.GMS2_3 == true)
{
UndertaleVariable def = variables.DefineLocal(compileContext.OriginalReferencedLocalVars, 0, name, compileContext.Data.Strings, compileContext.Data);
if (def != null)
compileContext.OriginalReferencedLocalVars.Add(def); // Add to the end, even if redundant (searches go from front to back anyway)
locals.Locals.Add(new UndertaleCodeLocals.LocalVar() { Index = (uint)def.VarID, Name = compileContext.Data?.Strings?.MakeString(name) });
}
else
locals.Locals.Add(new UndertaleCodeLocals.LocalVar() { Index = (uint)locals.Locals.Count, Name = compileContext.Data?.Strings?.MakeString(name) });
}
}
compileContext.OriginalCode.LocalsCount = (uint)locals.Locals.Count;
if (compileContext.OriginalCode.LocalsCount > compileContext.Data.MaxLocalVarCount)
compileContext.Data.MaxLocalVarCount = compileContext.OriginalCode.LocalsCount;
});
}
}
int localId = 0;
List<VariablePatch> localPatches = varPatches.FindAll(p => p.InstType == InstanceType.Local);
compileContext.MainThreadDelegate.Invoke(() =>
{
if (compileContext.ensureVariablesDefined)
{
var variables = compileContext.Data?.Variables;
if (variables != null)
{
foreach (KeyValuePair<string, string> v in compileContext.LocalVars)
{
if (v.Key == "arguments")
{
if (!defineArguments)
{
localId++;
continue;
}
}
UndertaleVariable def = variables.DefineLocal(compileContext.OriginalReferencedLocalVars, localId++, v.Key, compileContext.Data.Strings, compileContext.Data);
if (def != null)
{
foreach (var patch in localPatches.FindAll(p => p.Name == v.Key))
{
if (patch.Target.Kind == Opcode.Pop)
patch.Target.Destination = new Reference<UndertaleVariable>(def, patch.VarType);
else
patch.Target.Value = new Reference<UndertaleVariable>(def, patch.VarType);
if (patch.VarType == VariableType.Normal)
patch.Target.TypeInst = InstanceType.Local;
else if (CompileContext.GMS2_3)
patch.InstType = InstanceType.Self;
}
}
}
foreach (var patch in varPatches)
{
if (patch.InstType != InstanceType.Local)
{
var realInstType = patch.InstType;
if (realInstType >= 0)
realInstType = InstanceType.Self;
else if (realInstType == InstanceType.Other)
realInstType = InstanceType.Self;
else if (realInstType == InstanceType.Arg)
realInstType = InstanceType.Builtin;
else if (realInstType == InstanceType.Builtin)
realInstType = InstanceType.Self; // used with @@This@@
else if (realInstType == InstanceType.Stacktop)
realInstType = InstanceType.Self; // used with @@GetInstance@@
// 2.3 variable fix
// Definitely needs at least some change when ++/-- support is added,
// since that does use instance type global
if (CompileContext.GMS2_3 &&
patch.VarType == VariableType.Array &&
realInstType == InstanceType.Global)
realInstType = InstanceType.Self;
UndertaleVariable def = variables.EnsureDefined(patch.Name, realInstType,
compileContext.BuiltInList.GlobalArray.ContainsKey(patch.Name) ||
compileContext.BuiltInList.GlobalNotArray.ContainsKey(patch.Name) ||
compileContext.BuiltInList.Instance.ContainsKey(patch.Name) ||
compileContext.BuiltInList.InstanceLimitedEvent.ContainsKey(patch.Name),
compileContext.Data.Strings, compileContext.Data);
if (patch.Target.Kind == Opcode.Pop)
patch.Target.Destination = new Reference<UndertaleVariable>(def, patch.VarType);
else
patch.Target.Value = new Reference<UndertaleVariable>(def, patch.VarType);
if (patch.VarType == VariableType.Normal)
patch.Target.TypeInst = patch.InstType;
}
}
}
}
// GMS2.3 totally changed how functions work
// The FUNC chunk contains references to builtin functions, and anonymous function definitions called gml_Script_...
// The anonymous functions are bound to names by code in Data.GlobalInit
// so to get an actual mapping from names to functions, you have to decompile all GlobalInit scripts...
Decompiler.Decompiler.BuildSubFunctionCache(compileContext.Data);
foreach (var patch in funcPatches)
{
if (patch.isNewFunc)
{
// If there's already a function at this position, it's almost certainly the same one renamed.
// Disconnect it anyway.
if (compileContext.OriginalCode.ChildEntries.FirstOrDefault(e => e.Offset == patch.Offset) is UndertaleCode oldChild)
compileContext.OriginalCode.ChildEntries.Remove(oldChild);
UndertaleString childName = compileContext.Data.Strings.MakeString("gml_Script_" + patch.Name, out int childNameIndex);
UndertaleCode childEntry = new()
{
Name = childName,
Length = compileContext.OriginalCode.Length, // todo: get a more certainly up-to-date length
ParentEntry = compileContext.OriginalCode,
Offset = patch.Offset,
ArgumentsCount = (ushort)patch.ArgCount,
LocalsCount = compileContext.OriginalCode.LocalsCount // todo: use just the locals for the individual script
};
compileContext.OriginalCode.ChildEntries.Add(childEntry);
int childEntryIndex = compileContext.Data.Code.IndexOf(compileContext.OriginalCode) + compileContext.OriginalCode.ChildEntries.Count;
compileContext.Data.Code.Insert(childEntryIndex, childEntry);
UndertaleScript childScript = new()
{
Name = childName,
Code = childEntry
};
compileContext.Data.Scripts.Add(childScript);
UndertaleFunction childFunction = new()
{
Name = childName,
NameStringID = childNameIndex,
Autogenerated = true
};
compileContext.Data.Functions.Add(childFunction);
compileContext.Data.KnownSubFunctions.Add(patch.Name, childFunction);
continue;
}
UndertaleFunction def;
if (patch.ArgCount >= 0)
{
patch.Target.ArgumentsCount = (ushort)patch.ArgCount;
def = compileContext.Data.Functions.ByName(patch.Name);
if (CompileContext.GMS2_3)
{
if (def != null && def.Autogenerated)
def = null;
def ??= compileContext.Data.KnownSubFunctions.GetValueOrDefault(patch.Name);
}
if (compileContext.ensureFunctionsDefined)
def ??= compileContext.Data.Functions.EnsureDefined(patch.Name, compileContext.Data.Strings, true);
if (def != null)
{
patch.Target.Function = new Reference<UndertaleFunction>(def);
}
else
{
throw new Exception("Unknown function: " + patch.Name);
}
}
else
{
def = compileContext.Data.Functions.ByName(patch.Name);
// This code is only reachable using a 2.3 function definition. ("push.i gml_Script_scr_stuff")
def ??= compileContext.Data.KnownSubFunctions.GetValueOrDefault(patch.Name);
if (compileContext.ensureFunctionsDefined)
def ??= compileContext.Data.Functions.EnsureDefined(patch.Name, compileContext.Data.Strings, true);
if (def != null)
{
patch.Target.Value = new Reference<UndertaleFunction>(def);
}
else
{
throw new Exception("Unknown function: " + patch.Name);
}
}
}
if (stringPatches.Count >= 512)
{
// Kick in optimization by mapping all of them to indices
Dictionary<string, int> stringMap = new Dictionary<string, int>(compileContext.Data.Strings.Count);
int i = 0;
foreach (var s in compileContext.Data.Strings)
stringMap[s.Content] = i++;
foreach (var patch in stringPatches)
{
if (stringMap.TryGetValue(patch.Content, out int ind))
{
patch.Target.Value = new UndertaleResourceById<UndertaleString, UndertaleChunkSTRG>(
compileContext.Data.Strings[ind], ind);
}
else
{
UndertaleString newString = new UndertaleString(patch.Content);
patch.Target.Value = new UndertaleResourceById<UndertaleString, UndertaleChunkSTRG>(
newString, compileContext.Data.Strings.Count);
compileContext.Data.Strings.Add(newString);
}
}
}
else
{
foreach (var patch in stringPatches)
{
int ind;
UndertaleString str = compileContext.Data.Strings.MakeString(patch.Content, out ind);
var def = new UndertaleResourceById<UndertaleString, UndertaleChunkSTRG>(str, ind);
patch.Target.Value = def;
}
}
});
return instructions;
}
}
public class VariablePatch
{
public UndertaleInstruction Target;
public string Name;
public VariableType VarType;
public InstanceType InstType;
}
public class FunctionPatch
{
public UndertaleInstruction Target;
public string Name;
public int ArgCount;
public uint Offset;
public bool isNewFunc = false;
}
public class StringPatch
{
public UndertaleInstruction Target;
public string Content;
}
public class Patch
{
public List<UndertaleInstruction> Patches;
public UndertaleInstruction Target;
public int TargetIndex = -1;
public static Patch Start()
{
return new Patch()
{
Patches = new List<UndertaleInstruction>()
};
}
public static Patch StartHere(CodeWriter cw)
{
return new Patch()
{
TargetIndex = cw.instructions.Count,
Patches = new List<UndertaleInstruction>()
};
}
public static Patch Start(UndertaleInstruction target)
{
return new Patch()
{
Target = target
};
}
public void Finish(CodeWriter cw)
{
if (TargetIndex != -1)
{
var target = cw.instructions[TargetIndex];
foreach (UndertaleInstruction i in Patches)
{
i.JumpOffset = (int)target.Address - (int)i.Address;
}
}
else if (Target == null)
{
foreach (UndertaleInstruction i in Patches)
{
i.JumpOffset = (int)cw.offset - (int)i.Address;
}
}
}
public void Add(UndertaleInstruction instr)
{
if (TargetIndex != -1 || Target == null)
{
Patches.Add(instr);
}
else
{
instr.JumpOffset = (int)Target.Address - (int)instr.Address;
}
}
}
public class OtherContext
{
public enum ContextKind
{
Switch,
With
}
public ContextKind Kind;
public Patch Break;
public Patch Continue;
public DataType TypeToPop; // switch statements
public bool BreakUsed = false;
public bool ContinueUsed = false;
public OtherContext(Patch @break, Patch @continue, DataType typeToPop)
{
Kind = ContextKind.Switch;
Break = @break;
Continue = @continue;
TypeToPop = typeToPop;
}
public OtherContext(Patch @break, Patch @continue)
{
Kind = ContextKind.With;
Break = @break;
Continue = @continue;
}
public Patch UseBreak()
{
BreakUsed = true;
return Break;
}
public Patch UseContinue()
{
ContinueUsed = true;
return Continue;
}
}
public struct LoopContext
{
public Patch Break;
public Patch Continue;
public bool BreakUsed;
public bool ContinueUsed;
public LoopContext(Patch @break, Patch @continue)
{
Break = @break;
Continue = @continue;
BreakUsed = false;
ContinueUsed = false;
}
public Patch UseBreak()
{
BreakUsed = true;
return Break;
}
public Patch UseContinue()
{
ContinueUsed = true;
return Continue;
}
}
private static Patch HelpUseBreak(ref Stack<LoopContext> s)
{
LoopContext c = s.Pop();
Patch res = c.UseBreak();
s.Push(c);
return res;
}
private static Patch HelpUseContinue(ref Stack<LoopContext> s)
{
LoopContext c = s.Pop();
Patch res = c.UseContinue();
s.Push(c);
return res;
}
private static Patch HelpUseBreak(ref Stack<OtherContext> s)
{
OtherContext c = s.Pop();
Patch res = c.UseBreak();
s.Push(c);
return res;
}
private static Patch HelpUseContinue(ref Stack<OtherContext> s)
{
OtherContext c = s.Pop();
Patch res = c.UseContinue();
s.Push(c);
return res;
}
public static CodeWriter AssembleStatement(CompileContext compileContext, Parser.Statement s)
{
CodeWriter cw = new CodeWriter(compileContext);
AssembleStatement(cw, s);
return cw;
}
private static void AssembleStatement(CodeWriter cw, Parser.Statement s, int remaining = -1)
{
switch (s.Kind)
{
case Parser.Statement.StatementKind.Discard:
break;
case Parser.Statement.StatementKind.Block:
{
for (int i = 0; i < s.Children.Count; i++)
{
AssembleStatement(cw, s.Children[i], s.Children.Count - i);
}
}
break;
case Parser.Statement.StatementKind.Assign:
{
if (s.Children.Count != 3)
{
AssemblyWriterError(cw, "Malformed assignment statement.", s.Token);
break;
}
switch (s.Children[1].Token.Kind)
{
case Lexer.Token.TokenKind.Assign:
AssembleExpression(cw, s.Children[2], s.Children[0]); // value
AssembleStoreVariable(cw, s.Children[0], cw.typeStack.Pop()); // variable reference
break;
case Lexer.Token.TokenKind.AssignPlus:
AssembleOperationAssign(cw, s, Opcode.Add);
break;
case Lexer.Token.TokenKind.AssignMinus:
AssembleOperationAssign(cw, s, Opcode.Sub);
break;
case Lexer.Token.TokenKind.AssignTimes:
AssembleOperationAssign(cw, s, Opcode.Mul);
break;
case Lexer.Token.TokenKind.AssignDivide:
AssembleOperationAssign(cw, s, Opcode.Div);
break;
case Lexer.Token.TokenKind.AssignAnd:
AssembleOperationAssign(cw, s, Opcode.And, true);
break;
case Lexer.Token.TokenKind.AssignOr:
AssembleOperationAssign(cw, s, Opcode.Or, true);
break;
case Lexer.Token.TokenKind.AssignXor:
AssembleOperationAssign(cw, s, Opcode.Xor, true);
break;
case Lexer.Token.TokenKind.AssignMod:
AssembleOperationAssign(cw, s, Opcode.Mod);
break;
}
}
break;
case Parser.Statement.StatementKind.Pre:
AssemblePostOrPre(cw, s, false, false);
break;
case Parser.Statement.StatementKind.Post:
AssemblePostOrPre(cw, s, true, false);
break;
case Parser.Statement.StatementKind.TempVarDeclare:
foreach (Parser.Statement subDeclare in s.Children)
{
if (subDeclare.Children.Count != 0)
{
// Assignment
AssembleStatement(cw, subDeclare.Children[0]);
}
}
break;
case Parser.Statement.StatementKind.GlobalVarDeclare:
// Nothing?
break;
case Parser.Statement.StatementKind.If:
{
AssembleExpression(cw, s.Children[0]); // condition
DataType type = cw.typeStack.Pop();
if (type != DataType.Boolean)
{
cw.Emit(Opcode.Conv, type, DataType.Boolean);
}
var conditionPatch = Patch.Start();
conditionPatch.Add(cw.Emit(Opcode.Bf));
AssembleStatement(cw, s.Children[1]); // body
if (s.Children.Count == 3)
{
var elsePatch = Patch.Start();
elsePatch.Add(cw.Emit(Opcode.B));
conditionPatch.Finish(cw);
AssembleStatement(cw, s.Children[2]); // else statement
elsePatch.Finish(cw);
}
else
{
conditionPatch.Finish(cw);
}
}
break;
case Parser.Statement.StatementKind.ForLoop:
{
if (s.Children.Count != 4)
{
AssemblyWriterError(cw, "Malformed for loop.", s.Token);
break;
}
AssembleStatement(cw, s.Children[0]); // initial set
var conditionPatch = Patch.StartHere(cw);
AssembleExpression(cw, s.Children[1]); // condition
DataType type = cw.typeStack.Pop();
if (type != DataType.Boolean)
{
cw.Emit(Opcode.Conv, type, DataType.Boolean);
}
var endLoopPatch = Patch.Start();
endLoopPatch.Add(cw.Emit(Opcode.Bf));
var continuePatch = Patch.Start();
cw.loopContexts.Push(new LoopContext(endLoopPatch, continuePatch));
AssembleStatement(cw, s.Children[3]); // body
cw.loopContexts.Pop();
continuePatch.Finish(cw);
AssembleStatement(cw, s.Children[2]); // code that runs each iteration, usually "i++" or something
conditionPatch.Add(cw.Emit(Opcode.B));
conditionPatch.Finish(cw);
endLoopPatch.Finish(cw);
}
break;
case Parser.Statement.StatementKind.WhileLoop:
{
if (s.Children.Count != 2)
{
AssemblyWriterError(cw, "Malformed while loop.", s.Token);
break;
}
Patch conditionPatch = Patch.StartHere(cw);
AssembleExpression(cw, s.Children[0]); // condition
DataType type = cw.typeStack.Pop();
if (type != DataType.Boolean)
{
cw.Emit(Opcode.Conv, type, DataType.Boolean);
}
Patch endLoopPatch = Patch.Start();
endLoopPatch.Add(cw.Emit(Opcode.Bf));
cw.loopContexts.Push(new LoopContext(endLoopPatch, conditionPatch));
AssembleStatement(cw, s.Children[1]); // body
cw.loopContexts.Pop();
conditionPatch.Add(cw.Emit(Opcode.B));
conditionPatch.Finish(cw);
endLoopPatch.Finish(cw);
}
break;
case Parser.Statement.StatementKind.RepeatLoop:
{
if (s.Children.Count != 2)
{
AssemblyWriterError(cw, "Malformed repeat loop.", s.Token);
break;
}
// This loop keeps its counter on the stack
AssembleExpression(cw, s.Children[0]); // number of times to repeat
DataType type = cw.typeStack.Pop();
if (type != DataType.Int32)
{
cw.Emit(Opcode.Conv, type, DataType.Int32);
}
Patch endPatch = Patch.Start();
Patch repeatPatch = Patch.Start();
cw.Emit(Opcode.Dup, DataType.Int32).Extra = 0;
cw.Emit(Opcode.Push, DataType.Int32).Value = 0; // This is REALLY weird, but this happens, always- normally it's pushi.e
cw.Emit(Opcode.Cmp, DataType.Int32, DataType.Int32)
.ComparisonKind = ComparisonType.LTE;
endPatch.Add(cw.Emit(Opcode.Bt));
cw.loopContexts.Push(new LoopContext(endPatch, repeatPatch));
Patch startPatch = Patch.StartHere(cw);
AssembleStatement(cw, s.Children[1]); // body
repeatPatch.Finish(cw);
cw.Emit(Opcode.Push, DataType.Int32).Value = 1; // This is also weird- normally it's pushi.e
cw.Emit(Opcode.Sub, DataType.Int32, DataType.Int32);
cw.Emit(Opcode.Dup, DataType.Int32).Extra = 0;
cw.Emit(Opcode.Conv, DataType.Int32, DataType.Boolean);
startPatch.Add(cw.Emit(Opcode.Bt));
startPatch.Finish(cw);
endPatch.Finish(cw);
cw.Emit(Opcode.Popz, DataType.Int32); // Cleans up the stack of the decrementing value, which at this point should be <= 0
cw.loopContexts.Pop();
}
break;
case Parser.Statement.StatementKind.DoUntilLoop:
{
if (s.Children.Count != 2)
{
AssemblyWriterError(cw, "Malformed do..until loop.", s.Token);
break;
}
Patch endPatch = Patch.Start();
Patch repeatPatch = Patch.Start();
cw.loopContexts.Push(new LoopContext(endPatch, repeatPatch));
Patch startPatch = Patch.StartHere(cw);
AssembleStatement(cw, s.Children[0]); // body
repeatPatch.Finish(cw);
AssembleExpression(cw, s.Children[1]); // condition
DataType type = cw.typeStack.Pop();
if (type != DataType.Boolean)
{
cw.Emit(Opcode.Conv, type, DataType.Boolean);
}
startPatch.Add(cw.Emit(Opcode.Bf));
startPatch.Finish(cw);
endPatch.Finish(cw);
cw.loopContexts.Pop();
}
break;
case Parser.Statement.StatementKind.Switch:
{
Patch endPatch = Patch.Start();
bool isEnclosingLoop = (cw.loopContexts.Count > 0);
Patch continueEndPatch = null;
LoopContext enclosingContext = default(LoopContext);
if (isEnclosingLoop)
{
continueEndPatch = Patch.Start();
enclosingContext = cw.loopContexts.Peek();
}
// Value to compare against
AssembleExpression(cw, s.Children[0]);
var compareType = cw.typeStack.Pop();
cw.otherContexts.Push(new OtherContext(endPatch, continueEndPatch, compareType));
List<Tuple<Parser.Statement, Patch, int /* index in s.Children */>> cases = new List<Tuple<Parser.Statement, Patch, int>>();
Patch defaultPatch = null;
bool isReadyForOtherStatements = false;
for (int i = 1; i < s.Children.Count; i++)
{
var s2 = s.Children[i];
switch (s2.Kind)
{
case Parser.Statement.StatementKind.SwitchCase:
{
cw.Emit(Opcode.Dup, compareType).Extra = 0;
AssembleExpression(cw, s2.Children[0]);
cw.Emit(Opcode.Cmp, cw.typeStack.Pop(), compareType).ComparisonKind = ComparisonType.EQ;
Patch patch = Patch.Start();
patch.Add(cw.Emit(Opcode.Bt));
cases.Add(new Tuple<Parser.Statement, Patch, int>(s2, patch, i));
isReadyForOtherStatements = true;
}
break;
case Parser.Statement.StatementKind.SwitchDefault:
{
defaultPatch = Patch.Start();
cases.Add(new Tuple<Parser.Statement, Patch, int>(s2, defaultPatch, i));
isReadyForOtherStatements = true;
}
break;
default:
if (!isReadyForOtherStatements)
{
AssemblyWriterError(cw, "Statements in switch statement must be after case or default.", s2.Token);
}
break;
}
}
if (defaultPatch != null)
{
defaultPatch.Add(cw.Emit(Opcode.B));
}
endPatch.Add(cw.Emit(Opcode.B)); // Even if the default exists, this happens...
// Search for duplicates
List<Parser.Statement> alreadyUsed = new List<Parser.Statement>();
for (int i = 0; i < cases.Count; i++)
{
var c = cases[i].Item1;
bool shouldAdd = true;
for (int j = 0; j < alreadyUsed.Count; j++)
{
if (c == alreadyUsed[j])
{
shouldAdd = false;
AssemblyWriterError(cw, "Found duplicate case statement.", c.Token);
AssemblyWriterError(cw, "First occurrence:", alreadyUsed[j].Token);
}
}
if (shouldAdd)
alreadyUsed.Add(c);
}
// Write each case statement's code!
for (int i = 0; i < cases.Count; i++)
{
// Figure out where to start/end
var c = cases[i];
var next = (i + 1 < cases.Count) ? cases[i + 1] : null;
int endIndex = (next?.Item3 ?? s.Children.Count) - 1;
c.Item2.Finish(cw);
for (int j = c.Item3 + 1; j <= endIndex; j++)
{
AssembleStatement(cw, s.Children[j]);
}
}
// Write part at end in case a continue statement is used
OtherContext context = cw.otherContexts.Pop();
if (isEnclosingLoop && context.ContinueUsed)
{
endPatch.Add(cw.Emit(Opcode.B));
continueEndPatch.Finish(cw);
cw.Emit(Opcode.Popz, compareType);
enclosingContext.UseContinue().Add(cw.Emit(Opcode.B));
}
endPatch.Finish(cw);
cw.Emit(Opcode.Popz, compareType);
}
break;
case Parser.Statement.StatementKind.With:
{
Patch endPatch = Patch.Start();
Patch popEnvPatch = Patch.Start();
// Hacky override for @@Other@@ and @@This@@ usage- will likely expand to whatever other cases it turns out the compiler uses.
if (CompileContext.GMS2_3 &&
s.Children[0].Kind == Parser.Statement.StatementKind.ExprConstant &&
((InstanceType)s.Children[0].Constant.valueNumber).In(InstanceType.Other, InstanceType.Self))
{
cw.funcPatches.Add(new FunctionPatch()
{
Target = cw.EmitRef(Opcode.Call, DataType.Int32),
Name = (InstanceType)s.Children[0].Constant.valueNumber == InstanceType.Other ? "@@Other@@" : "@@This@@",
ArgCount = 0
});
cw.typeStack.Push(DataType.Variable);
}
else
AssembleExpression(cw, s.Children[0]); // new object/context
var type = cw.typeStack.Pop();
if (type != DataType.Int32)
{
if (CompileContext.GMS2_3 && type == DataType.Variable)
cw.Emit(Opcode.PushI, DataType.Int16).Value = (short)-9; // stacktop conversion
else
cw.Emit(Opcode.Conv, type, DataType.Int32);
}
cw.otherContexts.Push(new OtherContext(endPatch, popEnvPatch));
popEnvPatch.Add(cw.Emit(Opcode.PushEnv));
Patch startPatch = Patch.StartHere(cw);
AssembleStatement(cw, s.Children[1]);
popEnvPatch.Finish(cw);
startPatch.Add(cw.Emit(Opcode.PopEnv));
startPatch.Finish(cw);
if (cw.otherContexts.Pop().BreakUsed)
{
Patch cleanUpEndPatch = Patch.Start();
cleanUpEndPatch.Add(cw.Emit(Opcode.B));
endPatch.Finish(cw);
var dropPopenv = cw.Emit(Opcode.PopEnv);
dropPopenv.JumpOffsetPopenvExitMagic = true;
if (cw.compileContext.Data?.GeneralInfo?.BytecodeVersion <= 14)
dropPopenv.JumpOffset = -1048576; // magic for older versions
cleanUpEndPatch.Finish(cw);
}
else
{
endPatch.Finish(cw);
}
}
break;
case Parser.Statement.StatementKind.Continue:
if (cw.loopContexts.Count == 0 && (cw.otherContexts.Count == 0 || cw.otherContexts.Peek().Continue == null))
{
AssemblyWriterError(cw, "Continue statement placed outside of any loops.", s.Token);
}
else
{
if (cw.otherContexts.Count > 0 && cw.otherContexts.Peek().Continue != null)
HelpUseContinue(ref cw.otherContexts).Add(cw.Emit(Opcode.B));
else
HelpUseContinue(ref cw.loopContexts).Add(cw.Emit(Opcode.B));
}
break;
case Parser.Statement.StatementKind.Break:
if (cw.loopContexts.Count == 0 && cw.otherContexts.Count == 0)
{
AssemblyWriterError(cw, "Break statement placed outside of any loops.", s.Token);
}
else
{
if (cw.otherContexts.Count > 0 && cw.otherContexts.Peek().Break != null)
HelpUseBreak(ref cw.otherContexts).Add(cw.Emit(Opcode.B));
else
HelpUseBreak(ref cw.loopContexts).Add(cw.Emit(Opcode.B));
}
break;
case Parser.Statement.StatementKind.FunctionCall:
{
AssembleFunctionCall(cw, s);