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IcallTableGenerator.cs
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IcallTableGenerator.cs
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// Licensed to the .NET Foundation under one or more agreements.
// The .NET Foundation licenses this file to you under the MIT license.
using System;
using System.Collections.Generic;
using System.IO;
using System.Linq;
using System.Text;
using System.Text.Json;
using System.Reflection;
using Microsoft.Build.Framework;
using Microsoft.Build.Utilities;
using WasmAppBuilder;
using JoinedString;
internal sealed class IcallTableGenerator
{
public string[]? Cookies { get; private set; }
private List<Icall> _icalls = new List<Icall>();
private readonly HashSet<string> _signatures = new();
private Dictionary<string, IcallClass> _runtimeIcalls = new Dictionary<string, IcallClass>();
private LogAdapter Log { get; set; }
private readonly Func<string, string> _fixupSymbolName;
//
// Given the runtime generated icall table, and a set of assemblies, generate
// a smaller linked icall table mapping tokens to C function names
// The runtime icall table should be generated using
// mono --print-icall-table
//
public IcallTableGenerator(string? runtimeIcallTableFile, Func<string, string> fixupSymbolName, LogAdapter log)
{
Log = log;
_fixupSymbolName = fixupSymbolName;
if (runtimeIcallTableFile != null)
ReadTable(runtimeIcallTableFile);
}
public void ScanAssembly(Assembly asm)
{
foreach (Type type in asm.GetTypes())
ProcessType(type);
}
public IEnumerable<string> Generate(string? outputPath)
{
if (outputPath != null)
{
using TempFileName tmpFileName = new();
using (var w = new JoinedStringStreamWriter(tmpFileName.Path, false))
EmitTable(w);
if (Utils.CopyIfDifferent(tmpFileName.Path, outputPath, useHash: false))
Log.LogMessage(MessageImportance.Low, $"Generating icall table to '{outputPath}'.");
else
Log.LogMessage(MessageImportance.Low, $"Icall table in {outputPath} is unchanged.");
}
return _signatures;
}
private void EmitTable(StreamWriter w)
{
var assemblyMap = new Dictionary<string, string>();
foreach (var icall in _icalls)
assemblyMap[icall.Assembly!] = icall.Assembly!;
foreach (var assembly in assemblyMap.Keys)
{
var sorted = _icalls.Where(i => i.Assembly == assembly).ToArray();
Array.Sort(sorted);
string aname = assembly == "System.Private.CoreLib" ? "corlib" : _fixupSymbolName(assembly);
w.Write(
$$"""
#define ICALL_TABLE_{{aname}} 1
static int {{aname}}_icall_indexes [] = {
{{sorted.Join($",{w.NewLine} ", (icall, i) => $"/* {i} */ {icall.TokenIndex}")}}
};
{{sorted.Join($" {w.NewLine}", GenIcallDecl)}}
static void *{{aname}}_icall_funcs [] = {
{{sorted.Join($",{w.NewLine} ", (icall, i) => $"/* {i}:{icall.TokenIndex} */ {icall.Func}" )}}
};
static uint8_t {{aname}}_icall_flags [] = {
{{sorted.Join($",{w.NewLine} ", (icall, i) => $"/* {i}:{icall.TokenIndex} */ {icall.Flags}")}}
};
""");
}
}
// Read the icall table generated by mono --print-icall-table
private void ReadTable(string filename)
{
using var stream = File.OpenRead(filename);
using JsonDocument json = JsonDocument.Parse(stream);
var arr = json.RootElement;
foreach (var v in arr.EnumerateArray())
{
var className = v.GetProperty("klass").GetString()!;
if (className == "")
// Dummy value
continue;
var icallClass = new IcallClass(className);
_runtimeIcalls[icallClass.Name] = icallClass;
foreach (var icall_j in v.GetProperty("icalls").EnumerateArray())
{
if (!icall_j.TryGetProperty("name", out var nameElem))
continue;
string name = nameElem.GetString()!;
string func = icall_j.GetProperty("func").GetString()!;
bool handles = icall_j.GetProperty("handles").GetBoolean();
int flags = icall_j.TryGetProperty ("flags", out var _) ? int.Parse (icall_j.GetProperty("flags").GetString()!) : 0;
icallClass.Icalls.Add(name, new Icall(name, func, handles, flags));
}
}
}
private void ProcessType(Type type)
{
foreach (var method in type.GetMethods(BindingFlags.DeclaredOnly | BindingFlags.Public | BindingFlags.NonPublic | BindingFlags.Static | BindingFlags.Instance))
{
if ((method.GetMethodImplementationFlags() & MethodImplAttributes.InternalCall) == 0)
continue;
try
{
AddSignature(type, method);
}
catch (Exception ex) when (ex is not LogAsErrorException)
{
Log.Warning("WASM0001", $"Could not get icall, or callbacks for method '{type.FullName}::{method.Name}' because '{ex.Message}'");
continue;
}
var className = method.DeclaringType!.FullName!;
if (!_runtimeIcalls.ContainsKey(className))
// Registered at runtime
continue;
var icallClass = _runtimeIcalls[className];
Icall? icall = null;
// Try name first
icallClass.Icalls.TryGetValue(method.Name, out icall);
if (icall == null)
{
string? methodSig = BuildSignature(method, className);
if (methodSig != null)
icallClass.Icalls.TryGetValue(methodSig, out icall);
if (icall == null)
// Registered at runtime
continue;
}
icall.Method = method;
icall.TokenIndex = (int)method.MetadataToken & 0xffffff;
icall.Assembly = method.DeclaringType.Module.Assembly.GetName().Name;
_icalls.Add(icall);
}
foreach (var nestedType in type.GetNestedTypes())
ProcessType(nestedType);
string? BuildSignature(MethodInfo method, string className)
{
// Then with signature
var sig = new StringBuilder(method.Name + "(");
int pindex = 0;
foreach (var par in method.GetParameters())
{
if (pindex > 0)
sig.Append(',');
var t = par.ParameterType;
try
{
AppendType(sig, t);
}
catch (NotImplementedException nie)
{
Log.Warning("WASM0001", $"Failed to generate icall function for method '[{method.DeclaringType!.Assembly.GetName().Name}] {className}::{method.Name}'" +
$" because type '{nie.Message}' is not supported for parameter named '{par.Name}'. Ignoring.");
return null;
}
pindex++;
}
sig.Append(')');
return sig.ToString();
}
void AddSignature(Type type, MethodInfo method)
{
string? signature = SignatureMapper.MethodToSignature(method, Log);
if (signature == null)
{
throw new LogAsErrorException($"Unsupported parameter type in method '{type.FullName}.{method.Name}'");
}
if (_signatures.Add(signature))
Log.LogMessage(MessageImportance.Low, $"Adding icall signature {signature} for method '{type.FullName}.{method.Name}'");
}
}
// Append the type name used by the runtime icall tables
private void AppendType(StringBuilder sb, Type t)
{
if (t.IsArray)
{
AppendType(sb, t.GetElementType()!);
sb.Append("[]");
}
else if (t.IsByRef)
{
AppendType(sb, t.GetElementType()!);
sb.Append('&');
}
else if (t.IsPointer)
{
AppendType(sb, t.GetElementType()!);
sb.Append('*');
}
else if (t.IsEnum)
{
AppendType(sb, Enum.GetUnderlyingType(t));
}
else
{
sb.Append(t.Name switch
{
nameof(Char) => "char",
nameof(Boolean) => "bool",
nameof(SByte) => "sbyte",
nameof(Byte) => "byte",
nameof(Int16) => "int16",
nameof(UInt16) => "uint16",
nameof(Int32) => "int",
nameof(UInt32) => "uint",
nameof(Int64) => "long",
nameof(UInt64) => "ulong",
nameof(IntPtr) => "intptr",
nameof(UIntPtr) => "uintptr",
nameof(Single) => "single",
nameof(Double) => "double",
nameof(Object) => "object",
nameof(String) => "string",
_ => throw new NotImplementedException(t.FullName)
});
}
}
private static string MapType(Type t) => t.Name switch
{
"Void" => "void",
nameof(Double) => "double",
nameof(Single) => "float",
nameof(Int64) => "int64_t",
nameof(UInt64) => "uint64_t",
_ => "int",
};
private static string GenIcallDecl(Icall icall)
{
List<string> args = new();
var method = icall.Method!;
if (!method.IsStatic)
args.Add("int");
args.AddRange(method.GetParameters().Select(p => MapType(p.ParameterType)));
if (icall.Handles)
args.Add("int");
return $"{MapType(method.ReturnType)} {icall.Func} ({args.Join(", ")});";
}
private sealed class Icall : IComparable<Icall>
{
public Icall(string name, string func, bool handles, int flags)
{
Name = name;
Func = func;
Flags = flags;
Handles = handles;
TokenIndex = 0;
}
public string Name;
public string Func;
public string? Assembly;
public bool Handles;
public int Flags;
public int TokenIndex;
public MethodInfo? Method;
public int CompareTo(Icall? other)
{
return TokenIndex - other!.TokenIndex;
}
}
private sealed class IcallClass
{
public IcallClass(string name)
{
Name = name;
Icalls = new Dictionary<string, Icall>();
}
public string Name;
public Dictionary<string, Icall> Icalls;
}
}