/// <summary>
/// </summary>
/// <param name="llvmWriter">
/// </param>
/// <param name="exceptionHandlingClause">
/// </param>
public static void WriteCatchBegin(this LlvmWriter llvmWriter, CatchOfFinallyClause exceptionHandlingClause)
{
var writer = llvmWriter.Output;
var isFinally = exceptionHandlingClause.Flags.HasFlag(ExceptionHandlingClauseOptions.Finally);
if (isFinally)
{
writer.WriteLine("; Begin of Finally");
}
else
{
writer.WriteLine("; Begin of Catch");
}
var catchType = exceptionHandlingClause.Catch;
var opCodeNone = OpCodePart.CreateNop;
var bytePointerType = llvmWriter.ResolveType("System.Byte").ToPointerType();
var errorObjectOfCatchResultNumber = llvmWriter.WriteSetResultNumber(opCodeNone, bytePointerType);
writer.WriteLine("load i8** %.error_object");
var beginCatchResultNumber = llvmWriter.WriteSetResultNumber(opCodeNone, bytePointerType);
writer.WriteLine("call i8* @__cxa_begin_catch(i8* {0})", errorObjectOfCatchResultNumber);
if (catchType != null)
{
llvmWriter.WriteBitcast(opCodeNone, beginCatchResultNumber, catchType);
writer.WriteLine(string.Empty);
exceptionHandlingClause.ExceptionResult = opCodeNone.Result;
}
if (isFinally)
{
// set default error handler jump to carry on try/catch execution
writer.WriteLine("store i32 0, i32* %.finally_jump{0}", exceptionHandlingClause.Offset);
writer.WriteLine("br label %.finally_no_error_entry{0}", exceptionHandlingClause.Offset);
writer.Indent--;
writer.WriteLine(".finally_no_error_entry{0}:", exceptionHandlingClause.Offset);
writer.Indent++;
}
if (isFinally)
{
writer.WriteLine("; Begin of Finally Handler Body");
}
else
{
writer.WriteLine("; Begin of Catch Handler Body");
}
}
/// <summary>
/// </summary>
/// <param name="llvmWriter">
/// </param>
/// <param name="opCode">
/// </param>
/// <param name="exceptionHandlingClause">
/// </param>
/// <returns>
/// </returns>
private static IType WriteThrowInvoke(LlvmWriter llvmWriter, OpCodePart opCode, CatchOfFinallyClause exceptionHandlingClause)
{
var writer = llvmWriter.Output;
var errorAllocationResultNumber = llvmWriter.WriteAllocateException(opCode);
var exceptionPointerType = opCode.OpCodeOperands[0].Result.Type;
writer.Write("invoke void @__cxa_throw(i8* {0}, i8* bitcast (", errorAllocationResultNumber);
exceptionPointerType.WriteRttiPointerClassInfoDeclaration(writer);
writer.WriteLine("* @\"{0}\" to i8*), i8* null)", exceptionPointerType.GetRttiPointerInfoName());
writer.Indent++;
if (exceptionHandlingClause != null)
{
writer.Write("to label %.unreachable unwind label %.catch{0}", exceptionHandlingClause.Offset);
}
else
{
writer.Write("to label %.unreachable unwind label %.unwind_exception");
llvmWriter.needToWriteUnwindException = true;
}
llvmWriter.WriteDbgLine(opCode);
writer.WriteLine(string.Empty);
writer.Indent--;
llvmWriter.needToWriteUnreachable = true;
return exceptionPointerType;
}
/// <summary>
/// </summary>
/// <param name="llvmWriter">
/// </param>
/// <param name="opCode">
/// </param>
/// <param name="exceptionHandlingClause">
/// </param>
public static void WriteThrow(this LlvmWriter llvmWriter, OpCodePart opCode, CatchOfFinallyClause exceptionHandlingClause)
{
var writer = llvmWriter.Output;
writer.WriteLine("; Throw");
var exceptionPointerType = exceptionHandlingClause != null
? WriteThrowInvoke(llvmWriter, opCode, exceptionHandlingClause)
: WriteThrowCall(llvmWriter, opCode);
llvmWriter.typeRttiPointerDeclRequired.Add(exceptionPointerType);
llvmWriter.CheckIfExternalDeclarationIsRequired(exceptionPointerType);
}
/// <summary>
/// </summary>
/// <param name="llvmWriter">
/// </param>
/// <param name="exceptionHandlingClause">
/// </param>
private static void WriteRethrowInvoke(LlvmWriter llvmWriter, CatchOfFinallyClause exceptionHandlingClause)
{
var writer = llvmWriter.Output;
writer.WriteLine("invoke void @__cxa_rethrow()");
if (exceptionHandlingClause != null)
{
writer.Indent++;
writer.WriteLine(
"to label %.unreachable unwind label %.catch_with_cleanup_{0}_{1}",
exceptionHandlingClause.Offset,
exceptionHandlingClause.Offset + exceptionHandlingClause.Length);
writer.Indent--;
exceptionHandlingClause.RethrowCatchWithCleanUpRequired = true;
}
else
{
writer.Indent++;
writer.WriteLine("to label %.unreachable unwind label %.unwind_exception");
writer.Indent--;
llvmWriter.needToWriteUnwindException = true;
}
llvmWriter.needToWriteUnreachable = true;
}
/// <summary>
/// </summary>
/// <param name="llvmWriter">
/// </param>
/// <param name="opCode">
/// </param>
/// <param name="options">
/// </param>
/// <param name="finallyOrFaultClause">
/// </param>
/// <param name="catch">
/// </param>
/// <param name="filter">
/// </param>
/// <param name="exceptionAllocationResultNumber">
/// </param>
public static void WriteLandingPad(
this LlvmWriter llvmWriter,
OpCodePart opCode,
LandingPadOptions options,
CatchOfFinallyClause finallyOrFaultClause,
IType[] @catch = null,
int[] filter = null,
int? exceptionAllocationResultNumber = null)
{
var writer = llvmWriter.Output;
llvmWriter.WriteLandingPadVariables();
var landingPadResult = llvmWriter.WriteSetResultNumber(opCode, llvmWriter.ResolveType("System.Byte").ToPointerType());
writer.WriteLine("landingpad { i8*, i32 } personality i8* bitcast (i32 (...)* @__gxx_personality_v0 to i8*)");
if (options.HasFlag(LandingPadOptions.Cleanup))
{
writer.Indent++;
writer.WriteLine("cleanup");
writer.Indent--;
}
if (options.HasFlag(LandingPadOptions.EmptyFilter))
{
writer.Indent++;
writer.WriteLine("filter [0 x i8*] zeroinitializer");
writer.Indent--;
}
if (@catch != null && @catch.Any())
{
foreach (var catchType in @catch)
{
writer.Indent++;
if (catchType != null)
{
writer.Write("catch i8* bitcast (");
catchType.WriteRttiPointerClassInfoDeclaration(writer);
writer.WriteLine("* @\"{0}\" to i8*)", catchType.GetRttiPointerInfoName());
llvmWriter.typeRttiPointerDeclRequired.Add(catchType);
llvmWriter.CheckIfExternalDeclarationIsRequired(catchType);
}
else
{
writer.Write("catch i8* null");
}
writer.Indent--;
}
}
else if (finallyOrFaultClause != null)
{
// default catch with rethrowing it
writer.Indent++;
writer.WriteLine("catch i8* null");
writer.Indent--;
finallyOrFaultClause.EmptyFinallyRethrowRequired = true;
}
var getErrorObjectResultNumber = llvmWriter.WriteSetResultNumber(opCode, llvmWriter.ResolveType("System.Byte").ToPointerType());
writer.WriteLine("extractvalue {1} {0}, 0", landingPadResult, "{ i8*, i32 }");
writer.WriteLine("store i8* {0}, i8** %.error_object", getErrorObjectResultNumber);
var getErrorTypeIdResultNumber = llvmWriter.WriteSetResultNumber(opCode, llvmWriter.ResolveType("System.Int32"));
writer.WriteLine("extractvalue {1} {0}, 1", landingPadResult, "{ i8*, i32 }");
writer.Write("store i32 {0}, i32* %.error_typeid", getErrorTypeIdResultNumber);
if (exceptionAllocationResultNumber.HasValue)
{
writer.WriteLine(string.Empty);
writer.Write("call void @__cxa_free_exception(i8* {0})", exceptionAllocationResultNumber.Value);
}
opCode.Result = landingPadResult;
}
/// <summary>
/// </summary>
/// <param name="llvmWriter">
/// </param>
/// <param name="opCode">
/// </param>
/// <param name="exceptionHandlingClause">
/// </param>
/// <param name="upperLevelExceptionHandlingClause">
/// </param>
public static void WriteRethrow(
this LlvmWriter llvmWriter, OpCodePart opCode, CatchOfFinallyClause exceptionHandlingClause, CatchOfFinallyClause upperLevelExceptionHandlingClause)
{
var writer = llvmWriter.Output;
writer.WriteLine("; Rethrow");
WriteRethrowInvoke(llvmWriter, exceptionHandlingClause);
}
/// <summary>
/// </summary>
/// <param name="llvmWriter">
/// </param>
/// <param name="finallyClause">
/// </param>
public static void WriteFinallyVariables(this LlvmWriter llvmWriter, CatchOfFinallyClause finallyClause)
{
if (finallyClause.FinallyVariablesAreWritten)
{
return;
}
finallyClause.FinallyVariablesAreWritten = true;
var writer = llvmWriter.Output;
writer.Write("%.finally_jump{0} = ", finallyClause.Offset);
writer.Write("alloca i32, align " + LlvmWriter.PointerSize);
writer.WriteLine(string.Empty);
}
/// <summary>
/// </summary>
/// <param name="llvmWriter">
/// </param>
/// <param name="finallyClause">
/// </param>
public static void WriteFinallyLeave(this LlvmWriter llvmWriter, CatchOfFinallyClause finallyClause)
{
var writer = llvmWriter.Output;
llvmWriter.WriteFinallyVariables(finallyClause);
writer.WriteLine("store i32 {0}, i32* %.finally_jump{1}", finallyClause.FinallyJumps.Count, finallyClause.Offset);
writer.WriteLine("br label %.finally_no_error_entry{0}", finallyClause.Offset);
}
/// <summary>
/// </summary>
/// <param name="llvmWriter">
/// </param>
/// <param name="finallyClause">
/// </param>
public static void WriteEndFinally(this LlvmWriter llvmWriter, CatchOfFinallyClause finallyClause)
{
llvmWriter.WriteFinallyVariables(finallyClause);
}
/// <summary>
/// </summary>
/// <param name="llvmWriter">
/// </param>
/// <param name="exceptionHandlingClause">
/// </param>
/// <param name="nextExceptionHandlingClause">
/// </param>
public static void WriteCatchTest(
this LlvmWriter llvmWriter, CatchOfFinallyClause exceptionHandlingClause, CatchOfFinallyClause nextExceptionHandlingClause)
{
var writer = llvmWriter.Output;
writer.WriteLine("br label %.exception_switch{0}", exceptionHandlingClause.Offset);
writer.Indent--;
writer.WriteLine(".exception_switch{0}:", exceptionHandlingClause.Offset);
writer.Indent++;
writer.WriteLine("; Test Exception type");
var catchType = exceptionHandlingClause.Catch;
var opCodeNone = OpCodePart.CreateNop;
var errorTypeIdOfCatchResultNumber = llvmWriter.WriteSetResultNumber(opCodeNone, llvmWriter.ResolveType("System.Int32"));
writer.WriteLine("load i32* %.error_typeid");
var errorTypeIdOfExceptionResultNumber = llvmWriter.WriteSetResultNumber(opCodeNone, llvmWriter.ResolveType("System.Byte").ToPointerType());
writer.Write("call i32 @llvm.eh.typeid.for(i8* bitcast (");
catchType.WriteRttiPointerClassInfoDeclaration(writer);
writer.WriteLine("* @\"{0}\" to i8*))", catchType.GetRttiPointerInfoName());
var compareResultResultNumber = llvmWriter.WriteSetResultNumber(opCodeNone, llvmWriter.ResolveType("System.Boolean"));
writer.WriteLine("icmp eq i32 {0}, {1}", errorTypeIdOfCatchResultNumber, errorTypeIdOfExceptionResultNumber);
writer.WriteLine(
"br i1 {0}, label %.exception_handler{1}, label %.{2}",
compareResultResultNumber,
exceptionHandlingClause.Offset,
nextExceptionHandlingClause != null ? string.Concat("exception_switch", nextExceptionHandlingClause.Offset) : "resume");
writer.Indent--;
writer.WriteLine(".exception_handler{0}:", exceptionHandlingClause.Offset);
writer.Indent++;
}
/// <summary>
/// </summary>
/// <param name="llvmWriter">
/// </param>
/// <param name="opCode">
/// </param>
/// <param name="exceptionHandlingClause">
/// </param>
/// <param name="upperLevelExceptionHandlingClause">
/// </param>
public static void WriteCatchEnd(
this LlvmWriter llvmWriter, OpCodePart opCode, CatchOfFinallyClause exceptionHandlingClause, CatchOfFinallyClause upperLevelExceptionHandlingClause)
{
var writer = llvmWriter.Output;
var isFinally = exceptionHandlingClause.Flags.HasFlag(ExceptionHandlingClauseOptions.Finally);
if (isFinally)
{
writer.WriteLine("; End of Finally Handler Body");
}
else
{
writer.WriteLine("; End of Catch Handler Body");
}
if (isFinally)
{
// process Leave jumps
var index = 0;
var opCodeNope = OpCodePart.CreateNop;
var fullyDefinedRef = new FullyDefinedReference(
string.Concat("%.finally_jump", exceptionHandlingClause.Offset), llvmWriter.ResolveType("System.Int32"));
llvmWriter.WriteLlvmLoad(opCodeNope, llvmWriter.ResolveType("System.Int32"), fullyDefinedRef);
writer.WriteLine(string.Empty);
writer.WriteLine("switch i32 {1}, label %.finally_exit{0} [", exceptionHandlingClause.Offset, opCodeNope.Result);
writer.Indent++;
writer.WriteLine("i32 {0}, label %.finally_exit{1}", index++, exceptionHandlingClause.Offset);
foreach (var leave in exceptionHandlingClause.FinallyJumps)
{
writer.WriteLine("i32 {0}, label %{1}", index++, leave);
}
writer.Indent--;
writer.WriteLine("]");
llvmWriter.WriteLabel(writer, string.Concat(".finally_exit", exceptionHandlingClause.Offset));
if (exceptionHandlingClause.EmptyFinallyRethrowRequired)
{
// rethrow exception in empty finally block
var opCodeNop = OpCodePart.CreateNop;
llvmWriter.WriteRethrow(
opCodeNop,
llvmWriter.catchScopes.Count > 0 ? llvmWriter.catchScopes.Peek() : null,
llvmWriter.tryScopes.Count > 0 ? llvmWriter.tryScopes.Peek().Catches.First() : null);
}
}
var startOfHandlerAddress = exceptionHandlingClause.Offset;
var endOfHandlerAddress = exceptionHandlingClause.Offset + exceptionHandlingClause.Length;
if (exceptionHandlingClause.RethrowCatchWithCleanUpRequired)
{
llvmWriter.WriteLabel(writer, string.Format(".catch_with_cleanup_{0}_{1}", startOfHandlerAddress, endOfHandlerAddress));
var opCodeNop = OpCodePart.CreateNop;
llvmWriter.WriteLandingPad(
opCodeNop,
LandingPadOptions.Cleanup,
null,
new[] { upperLevelExceptionHandlingClause != null ? upperLevelExceptionHandlingClause.Catch : llvmWriter.ResolveType("System.Exception") });
writer.WriteLine(string.Empty);
}
else
{
writer.WriteLine("store i32 0, i32* %.error_typeid");
}
writer.WriteLine("call void @__cxa_end_catch()");
if (!exceptionHandlingClause.RethrowCatchWithCleanUpRequired || upperLevelExceptionHandlingClause == null)
{
var isLeave = opCode.Any(Code.Leave, Code.Leave_S);
var nextOp = opCode.Next;
if (!isLeave &&
(nextOp == null || nextOp.JumpDestination == null || !nextOp.JumpDestination.Any() || nextOp.GroupAddressStart != endOfHandlerAddress))
{
if (nextOp != null && nextOp.CatchOrFinallyBegin == null || opCode.Any(Code.Leave, Code.Leave_S)
|| llvmWriter.OpsByAddressStart.Values.Any(op => op.ToCode() == Code.Ret))
{
writer.WriteLine("br label %.exit{0}", endOfHandlerAddress);
llvmWriter.WriteLabel(writer, string.Concat(".exit", endOfHandlerAddress));
writer.WriteLine(string.Empty);
}
else
{
writer.WriteLine("unreachable");
}
}
else
{
if (isLeave)
{
writer.WriteLine("br label %.a{0}", opCode.JumpAddress());
}
else
{
writer.WriteLine("br label %.a{0}", nextOp.GroupAddressStart);
}
}
}
else
{
if (!upperLevelExceptionHandlingClause.Flags.HasFlag(ExceptionHandlingClauseOptions.Finally))
{
writer.WriteLine("br label %.exception_switch{0}", upperLevelExceptionHandlingClause.Offset);
}
else
{
writer.WriteLine("br label %.finally_no_error_entry{0}", upperLevelExceptionHandlingClause.Offset);
}
}
if (isFinally)
{
writer.WriteLine("; End of Finally");
}
else
{
writer.WriteLine("; End of Catch");
}
}
