// Removes the TryBlock and all its TryHandlerBlocks. The code inside the try block
// is not removed.
public void removeTryBlock(TryBlock tryBlock)
{
int tryBlockIndex = baseBlocks.IndexOf(tryBlock);
if (tryBlockIndex < 0)
{
throw new ApplicationException("Can't remove the TryBlock since it's not this ScopeBlock's TryBlock");
}
foreach (var bb in tryBlock.BaseBlocks)
{
bb.Parent = this;
}
baseBlocks.RemoveAt(tryBlockIndex);
baseBlocks.InsertRange(tryBlockIndex, tryBlock.BaseBlocks);
tryBlock.BaseBlocks.Clear();
// Get removed blocks and make sure they're not referenced by remaining code
var removedBlocks = new List <Block>();
foreach (var handler in tryBlock.TryHandlerBlocks)
{
handler.getTheBlocks(removedBlocks);
}
if (!verifyNoExternalRefs(removedBlocks))
{
throw new ApplicationException("Removed blocks are referenced by remaining code");
}
removeAllDeadBlocks(Utils.convert <TryHandlerBlock, BaseBlock>(tryBlock.TryHandlerBlocks));
}
void AddTargets(List <BaseBlock> dest, TryBlock tryBlock)
{
AddTargets(dest, (ScopeBlock)tryBlock);
foreach (var tryHandlerBlock in tryBlock.TryHandlerBlocks)
{
dest.Add(tryHandlerBlock);
AddTargets(dest, tryHandlerBlock);
}
}
bool find(Blocks blocks, out TryBlock tryBlock)
{
tryBlock = null;
foreach (var bb in blocks.MethodBlocks.BaseBlocks) {
tryBlock = bb as TryBlock;
if (tryBlock == null)
continue;
if (tryBlock.TryHandlerBlocks.Count != 1)
continue;
var catchBlock = tryBlock.TryHandlerBlocks[0];
if (catchBlock.HandlerType != ExceptionHandlerType.Catch ||
catchBlock.CatchType.FullName != "System.Exception") {
continue;
}
if (catchBlock.BaseBlocks.Count != 1)
continue;
var handlerBlock = catchBlock.BaseBlocks[0] as HandlerBlock;
if (handlerBlock == null)
continue;
int calls = 0;
Instr callInstr = null;
bool failed = false;
foreach (var bb2 in handlerBlock.BaseBlocks) {
var block = bb2 as Block;
if (block == null) {
failed = true;
break;
}
foreach (var instr in block.Instructions) {
switch (instr.OpCode.Code) {
case Code.Call:
case Code.Calli:
case Code.Callvirt:
calls++;
callInstr = instr;
break;
}
}
}
if (failed || calls != 1 || callInstr.OpCode.Code != Code.Call)
continue;
var calledMethod = callInstr.Operand as MethodReference;
if (calledMethod == null)
continue;
if (!isExceptionLogger(calledMethod))
continue;
return true;
}
return false;
}
BaseBlocksList createBaseBlockList(List <Block> allBlocks, List <List <ExceptionHandler> > exSorted)
{
var bbl = new BaseBlocksList();
foreach (var block in allBlocks)
{
int start = instrToIndex[block.FirstInstr.Instruction];
int end = instrToIndex[block.LastInstr.Instruction];
bbl.add(block, start, end);
}
foreach (var exHandlers in exSorted)
{
var tryBlock = new TryBlock();
var tryStart = instrToIndex[exHandlers[0].TryStart];
var tryEnd = getInstrIndex(exHandlers[0].TryEnd) - 1;
tryBlock.BaseBlocks = bbl.replace(tryStart, tryEnd, tryBlock);
foreach (var exHandler in exHandlers)
{
var tryHandlerBlock = new TryHandlerBlock(exHandler);
tryBlock.addTryHandler(tryHandlerBlock);
int filterStart = -1, handlerStart = -1, handlerEnd = -1;
if (exHandler.FilterStart != null)
{
filterStart = instrToIndex[exHandler.FilterStart];
var end = instrToIndex[exHandler.HandlerStart] - 1;
tryHandlerBlock.FilterHandlerBlock.BaseBlocks = bbl.replace(filterStart, end, tryHandlerBlock.FilterHandlerBlock);
}
handlerStart = instrToIndex[exHandler.HandlerStart];
handlerEnd = getInstrIndex(exHandler.HandlerEnd) - 1;
tryHandlerBlock.HandlerBlock.BaseBlocks = bbl.replace(handlerStart, handlerEnd, tryHandlerBlock.HandlerBlock);
tryHandlerBlock.BaseBlocks = bbl.replace(filterStart == -1 ? handlerStart : filterStart, handlerEnd, tryHandlerBlock);
}
}
return(bbl);
}
void doTryBlock(TryBlock tryBlock)
{
var tryStart = blocks.Count;
stateStack.Push(new BlockState(tryBlock));
processBaseBlocks(tryBlock.BaseBlocks, (block) => {
return(block.LastInstr.OpCode == OpCodes.Leave ||
block.LastInstr.OpCode == OpCodes.Leave_S);
});
stateStack.Pop();
var tryEnd = blocks.Count - 1;
if (tryBlock.TryHandlerBlocks.Count == 0)
{
throw new ApplicationException("No handler blocks");
}
foreach (var handlerBlock in tryBlock.TryHandlerBlocks)
{
visited[handlerBlock] = true;
stateStack.Push(new BlockState(handlerBlock));
var filterStart = blocks.Count;
if (handlerBlock.FilterHandlerBlock.BaseBlocks != null)
{
doBaseBlock(handlerBlock.FilterHandlerBlock);
}
var handlerStart = blocks.Count;
doBaseBlock(handlerBlock.HandlerBlock);
var handlerEnd = blocks.Count - 1;
exceptions.Add(new ExceptionInfo(tryStart, tryEnd, filterStart, handlerStart, handlerEnd, handlerBlock.CatchType, handlerBlock.HandlerType));
stateStack.Pop();
}
}
BaseBlocksList CreateBaseBlockList(List<Block> allBlocks, List<List<ExceptionHandler>> exSorted) {
var bbl = new BaseBlocksList();
foreach (var block in allBlocks) {
int start = instrToIndex[block.FirstInstr.Instruction];
int end = instrToIndex[block.LastInstr.Instruction];
bbl.Add(block, start, end);
}
foreach (var exHandlers in exSorted) {
var tryBlock = new TryBlock();
var tryStart = instrToIndex[exHandlers[0].TryStart];
var tryEnd = GetInstrIndex(exHandlers[0].TryEnd) - 1;
tryBlock.BaseBlocks = bbl.Replace(tryStart, tryEnd, tryBlock);
foreach (var exHandler in exHandlers) {
var tryHandlerBlock = new TryHandlerBlock(exHandler);
tryBlock.AddTryHandler(tryHandlerBlock);
int filterStart = -1, handlerStart = -1, handlerEnd = -1;
if (exHandler.FilterStart != null) {
filterStart = instrToIndex[exHandler.FilterStart];
var end = instrToIndex[exHandler.HandlerStart] - 1;
tryHandlerBlock.FilterHandlerBlock.BaseBlocks = bbl.Replace(filterStart, end, tryHandlerBlock.FilterHandlerBlock);
}
handlerStart = instrToIndex[exHandler.HandlerStart];
handlerEnd = GetInstrIndex(exHandler.HandlerEnd) - 1;
tryHandlerBlock.HandlerBlock.BaseBlocks = bbl.Replace(handlerStart, handlerEnd, tryHandlerBlock.HandlerBlock);
tryHandlerBlock.BaseBlocks = bbl.Replace(filterStart == -1 ? handlerStart : filterStart, handlerEnd, tryHandlerBlock);
}
}
return bbl;
}
void doTryBlock(TryBlock tryBlock)
{
var tryStart = blocks.Count;
stateStack.Push(new BlockState(tryBlock));
processBaseBlocks(tryBlock.BaseBlocks, (block) => {
return block.LastInstr.OpCode == OpCodes.Leave ||
block.LastInstr.OpCode == OpCodes.Leave_S;
});
stateStack.Pop();
var tryEnd = blocks.Count - 1;
if (tryBlock.TryHandlerBlocks.Count == 0)
throw new ApplicationException("No handler blocks");
foreach (var handlerBlock in tryBlock.TryHandlerBlocks) {
visited[handlerBlock] = true;
stateStack.Push(new BlockState(handlerBlock));
var filterStart = blocks.Count;
if (handlerBlock.FilterHandlerBlock.BaseBlocks != null)
doBaseBlock(handlerBlock.FilterHandlerBlock);
var handlerStart = blocks.Count;
doBaseBlock(handlerBlock.HandlerBlock);
var handlerEnd = blocks.Count - 1;
exceptions.Add(new ExceptionInfo(tryStart, tryEnd, filterStart, handlerStart, handlerEnd, handlerBlock.CatchType, handlerBlock.HandlerType));
stateStack.Pop();
}
}
void AddTargets(List<BaseBlock> dest, TryBlock tryBlock) {
AddTargets(dest, (ScopeBlock)tryBlock);
foreach (var tryHandlerBlock in tryBlock.TryHandlerBlocks) {
dest.Add(tryHandlerBlock);
AddTargets(dest, tryHandlerBlock);
}
}