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#include "mangle.h"
#include "name.h"
#include "syntax.h"
namespace Slang
{
struct ManglingContext
{
StringBuilder sb;
};
void emitRaw(
ManglingContext* context,
char const* text)
{
context->sb.append(text);
}
void emit(
ManglingContext* context,
UInt value)
{
context->sb.append(value);
}
void emitName(
ManglingContext* context,
Name* name)
{
String str = getText(name);
// If the name consists of only traditional "identifer characters"
// (`[a-zA-Z_]`), then we wnat to emit it more or less directly.
//
// If it contains code points outside that range, we'll need to
// do something to encode them. I don't want to deal with
// that right now, so I'm going to ignore it.
// We prefix the string with its byte length, so that
// decoding doesn't have to worry about finding a terminator.
UInt length = str.Length();
emit(context, length);
context->sb.append(str);
}
void emitType(
ManglingContext* context,
Type* type)
{
// TODO: actually implement this bit...
}
void emitQualifiedName(
ManglingContext* context,
Decl* decl)
{
auto parentDecl = decl->ParentDecl;
if( parentDecl )
{
emitQualifiedName(context, parentDecl);
}
// A generic declaration is kind of a pseudo-declaration
// as far as the user is concerned; so we don't want
// to emit its name.
if( auto genericDecl = dynamic_cast<GenericDecl*>(decl) )
{
return;
}
emitName(context, decl->nameAndLoc.name);
if( auto parentGenericDecl = dynamic_cast<GenericDecl*>(parentDecl))
{
emitRaw(context, "g");
UInt genericParameterCount = 0;
for( auto mm : parentGenericDecl->Members )
{
if(mm.As<GenericTypeParamDecl>())
{
genericParameterCount++;
}
else if(mm.As<GenericValueParamDecl>())
{
genericParameterCount++;
}
else if(mm.As<GenericTypeConstraintDecl>())
{
genericParameterCount++;
}
else
{
}
}
emit(context, genericParameterCount);
for( auto mm : parentGenericDecl->Members )
{
if(auto genericTypeParamDecl = mm.As<GenericTypeParamDecl>())
{
emitRaw(context, "T");
}
else if(auto genericValueParamDecl = mm.As<GenericValueParamDecl>())
{
emitRaw(context, "v");
emitType(context, genericValueParamDecl->getType());
}
else if(mm.As<GenericTypeConstraintDecl>())
{
emitRaw(context, "C");
// TODO: actually emit info about the constraint
}
else
{
}
}
}
// If the declaration has parameters, then we need to emit
// those parameters to distinguish it from other declarations
// of the same name that might have different parameters.
//
// We'll also go ahead and emit the result type as well,
// just for completeness.
//
if( auto callableDecl = dynamic_cast<CallableDecl*>(decl) )
{
emitRaw(context, "p");
UInt parameterCount = callableDecl->GetParameters().Count();
emit(context, parameterCount);
for(auto pp : callableDecl->GetParameters())
{
emitType(context, pp->getType());
}
emitType(context, callableDecl->ReturnType);
}
}
void mangleName(
ManglingContext* context,
Decl* decl)
{
// TODO: catch cases where the declaration should
// forward to something else? E.g., what if we
// are asked to mangle the name of a `typedef`?
// We will start with a unique prefix to avoid
// clashes with user-defined symbols:
emitRaw(context, "_S");
// Next we will add a bit of info to register
// the *kind* of declaration we are dealing with.
//
// Functions will get no prefix, since we assume
// they are a common case:
if(dynamic_cast<FuncDecl*>(decl))
{}
// Types will get a `T` prefix:
else if(dynamic_cast<AggTypeDecl*>(decl))
emitRaw(context, "T");
else if(dynamic_cast<TypeDefDecl*>(decl))
emitRaw(context, "T");
// Variables will get a `V` prefix:
//
// TODO: probably need to pull constant-buffer
// declarations out of this...
else if(dynamic_cast<VarDeclBase*>(decl))
emitRaw(context, "V");
else
{
// TODO: handle other cases
}
// Now we encode the qualified name of the decl.
emitQualifiedName(context, decl);
}
String getMangledName(Decl* decl)
{
ManglingContext context;
mangleName(&context, decl);
return context.sb.ProduceString();
}
}
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