public void EnsureStringBuilderOnStackTop()
{
switch (StackTop)
{
case StringMangleStackTop.Unknown:
LoadOrCreateStringBuilder();
break;
case StringMangleStackTop.String:
using (Emitter.UseTempLocal <string>(out var stringVar))
{
Emitter.Stloc(stringVar);
LoadOrCreateStringBuilder();
Emitter.Ldloc(stringVar);
}
Emitter.Callvirt(SmUtils.Method_StringBuilder_Append_String);
break;
case StringMangleStackTop.StringBuilder:
break;
default: throw new CodeBug.Unreachable();
}
StackTop = StringMangleStackTop.StringBuilder;
}
void LoadOrCreateStringBuilder(Local initString)
{
if (_sbLocal != null)
{
Emitter.Ldloc(_sbLocal);
Emitter.Ldloc(initString);
Emitter.Callvirt(SmUtils.Method_StringBuilder_Append_String);
}
else
{
SmUtils.NewStringBuilder(Emitter, initString);
}
}
internal void Use(IStringMangleMethod demangler)
{
if (StackTop == StringMangleStackTop.String) // means we have more than one part, and previous demangler left us with a string
{
EnsureStringBuilderOnStackTop();
}
var top = demangler.Emit(this);
if (!top.HasValue)
{
return; // demangler refused to process current piece, calling code will select another demangler
}
switch (top.Value)
{
case StringMangleStackTop.String:
switch (StackTop)
{
case StringMangleStackTop.String:
using (Emitter.UseTempLocal <int>(out var stringVar1))
using (Emitter.UseTempLocal <int>(out var stringVar2))
{
Emitter.Stloc(stringVar1);
Emitter.Stloc(stringVar2);
LoadOrCreateStringBuilder(stringVar1);
Emitter.Ldloc(stringVar2);
}
Emitter.Callvirt(SmUtils.Method_StringBuilder_Append_String);
break;
case StringMangleStackTop.StringBuilder:
Emitter.Callvirt(SmUtils.Method_StringBuilder_Append_String);
top = StringMangleStackTop.StringBuilder;
break;
}
break;
case StringMangleStackTop.StringBuilder:
if (StackTop == StringMangleStackTop.String)
{
throw Mangler.Context.Error("demangler must call EnsureStringBuilderOnStackTop() if it needs a string builder instead of creating its own");
}
// StackTop == Unknown is Okay, means StringBuilder was created (and hopefully populated) by the demangler
// StackTop == StringBuilder is Okay, means StringBuilder was added to (and hopefully not created) by the demangler
break;
default: throw Mangler.Context.Error("demangler must leave either string or StringBuilder on stack");
}
StackTop = top.Value;
}
