public static AssemblyBuilder Compile(WasmModule module, string className, string assemblyName)
{
var assembly = AssemblyBuilder.DefineDynamicAssembly(new AssemblyName(assemblyName), AssemblyBuilderAccess.RunAndCollect);
var m = assembly.DefineDynamicModule(assemblyName);
var type = m.DefineType(className);
var funcSection = module.ReadFunctionSection();
var codeSection = module.ReadCodeSection();
var typeSection = module.ReadTypeSection();
for (var i = 0; i < funcSection.Entries.Count; i++)
{
var func = funcSection.Entries[0];
var sig = typeSection.Entries[(int)func];
var code = codeSection.Bodies[i];
var method = type.DefineMethod($"func_{i}", MethodAttributes.Private, Convert(sig.Return), sig.Parameters.Select(p => Convert(p)).ToArray());
var ilGen = method.GetILGenerator();
var arg = new WasmMSILArg(ilGen);
var visitor = new WasmMSIL();
foreach (var opcode in code.Opcodes)
{
opcode.AcceptVistor(visitor, arg);
}
}
return(assembly);
}
public IntermediateContext(FunctionSignature signature, WasmModule wasmModule, StreamWriter writer)
{
Indentation = 0;
Signature = signature;
WasmModule = wasmModule;
streamWriter = writer;
Stack = new Stack <Variable>();
StackIndices = new Stack <int>();
StackIndices.Push(0);
varCount = 0;
RestOfBlockUnreachable = false;
}
public static int Main(string[] args)
{
WasmModule module;
using (FileStream input = File.Open(@".\sample.wasm", FileMode.Open, FileAccess.Read)) {
module = WasmModule.Create(input);
}
bool validModule = module.Validate();
using (FileStream output = File.Open(@".\sample.wat", FileMode.Create, FileAccess.Write)) {
module.ToText(output);
}
return(0);
}
private static void Main(string[] args)
{
// print debug messages to console
Trace.Listeners.Add(new ConsoleTraceListener());
var arguments = Cli.Parse <CliArguments>(args);
if (!File.Exists(arguments.InputFile))
{
Console.WriteLine("Pass me a file as argument");
return;
}
var sw = Stopwatch.StartNew();
var wasmFile = WasmModule.Read(arguments.InputFile);
sw.Stop();
Console.WriteLine($"Read in {sw.Elapsed}");
Console.WriteLine("wasm version: " + wasmFile.Version);
sw = Stopwatch.StartNew();
Stream outputStream = arguments.OutputFile is null
? Console.OpenStandardOutput()
: File.Open(arguments.OutputFile, FileMode.Create);
using var w = new StreamWriter(outputStream);
IDecompiler dec = arguments.Decompiler switch {
DecompilerKind.Disassembler => (IDecompiler) new DisassemblingDecompiler(wasmFile),
DecompilerKind.IntermediateRepresentation => new IntermediateRepresentationDecompiler(wasmFile),
DecompilerKind.Generic => new GenericDecompiler(wasmFile),
_ => throw new Exception("Invalid decompiler type specified"),
};
for (uint i = arguments.Skip; i < Math.Min(arguments.Skip + arguments.Count, wasmFile.FunctionBodies.Length); i++)
{
Debug.WriteLine($"Decompiling function {i} (0x{i:X})");
dec.DecompileFunction(w, (int)i);
}
sw.Stop();
Console.WriteLine($"Written to {arguments.OutputFile} in {sw.Elapsed}");
}
public GenericDecompiler(WasmModule wasmModule)
{
WasmModule = wasmModule;
}
public Rewriter(WasmModule module, string @namespace, string @class)
{
Module = module;
Namespace = @namespace;
Class = @class;
}
public static ModuleNode Compile(WasmModule module)
{
var funcSection = module.Function;
var codeSection = module.Code;
var typeSection = module.Type;
var importSection = module.Import;
var globalSection = module.Global;
var moduleNode = new ModuleNode();
var context = new WasmNodeContext {
Module = moduleNode
};
foreach (var type in typeSection.Entries)
{
context.Types.Add(type);
}
foreach (var import in importSection.Entries)
{
switch (import.Kind)
{
case WasmExternalKind.Function:
var type = typeSection.Entries[(int)import.TypeIndex];
var function = new FunctionNode(type)
{
Name = $"{import.Module}_{import.Field}"
};
moduleNode.ImportedFunctions.Add(function);
moduleNode.Imports.Add(new ImportNode {
Module = import.Module,
Field = import.Field,
Node = function
});
break;
case WasmExternalKind.Global:
var global = new GlobalNode(import.Global.Type, import.Global.Mutable)
{
Name = $"{import.Module}_{import.Field}"
};
moduleNode.ImportedGlobals.Add(global);
moduleNode.Imports.Add(new ImportNode {
Module = import.Module,
Field = import.Field,
Node = global
});
break;
}
}
AddGlobals(context, globalSection);
DeclareFunctions(context, funcSection, typeSection);
for (var i = 0; i < codeSection.Bodies.Count; i++)
{
var code = codeSection.Bodies[i];
var func = moduleNode.Functions[i];
var arg = new WasmFunctionNodeArg(func)
{
Context = context
};
foreach (var local in code.Locals)
{
func.AddLocals(local.Type, local.Count);
}
arg.PushBlock(func.Execution);
var visitor = new WasmNode();
foreach (var opcode in code.Opcodes)
{
opcode.AcceptVistor(visitor, arg);
}
}
return(moduleNode);
}
public WasmModuleInstance(WasmModule module)
{
Module = module;
Exports = new WasmModuleExports(this);
}
public IntermediateConverter(WasmModule wasmModule, FunctionBody function, FunctionSignature signature)
{
this.wasmModule = wasmModule;
this.function = function;
this.signature = signature;
}
public DisassemblingDecompiler(WasmModule wasmModule)
{
WasmModule = wasmModule;
}
public IntermediateRepresentationDecompiler(WasmModule wasmModule)
{
WasmModule = wasmModule;
}
