Source/WebGPU/WGSL/AST/ShaderModule.h

/*
 * Copyright (c) 2021 Apple Inc. All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 * 1. Redistributions of source code must retain the above copyright
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 *    notice, this list of conditions and the following disclaimer in the
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 *
 * THIS SOFTWARE IS PROVIDED BY APPLE INC. ``AS IS'' AND ANY
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 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
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#pragma once

#include "ASTNode.h"
#include "FunctionDecl.h"
#include "GlobalDecl.h"
#include "GlobalDirective.h"
#include "GlobalVariableDecl.h"
#include "StructureDecl.h"
#include <wtf/HashMap.h>
#include <wtf/text/StringHash.h>
#include <wtf/text/WTFString.h>

namespace WGSL::AST {

class ShaderModule final : ASTNode {
    WTF_MAKE_FAST_ALLOCATED;
public:
    ShaderModule(SourceSpan span, Vector<UniqueRef<GlobalDirective>>&& directives, Vector<UniqueRef<GlobalDecl>>&& decls)
        : ASTNode(span)
        , m_directives(WTFMove(directives))
    {
        for (auto& decl : decls) {
            if (is<StructDecl>(decl.get())) {
                // We want to go from UniqueRef<BaseClass> to UniqueRef<DerivedClass>, but that is not supported by downcast.
                // So instead we do UniqueRef -> unique_ptr -> raw_pointer -(downcast)-> raw_pointer -> unique_ptr -> UniqueRef...
                GlobalDecl* rawPtr = decl.moveToUniquePtr().release();
                StructDecl* downcastedRawPtr = downcast<StructDecl>(rawPtr);
                m_structs.append(makeUniqueRefFromNonNullUniquePtr(std::unique_ptr<StructDecl>(downcastedRawPtr)));
            } else if (is<GlobalVariableDecl>(decl.get())) {
                GlobalDecl* rawPtr = decl.moveToUniquePtr().release();
                GlobalVariableDecl* downcastedRawPtr = downcast<GlobalVariableDecl>(rawPtr);
                m_globalVars.append(makeUniqueRefFromNonNullUniquePtr(std::unique_ptr<GlobalVariableDecl>(downcastedRawPtr)));
            } else {
                GlobalDecl* rawPtr = decl.moveToUniquePtr().release();
                FunctionDecl* func = downcast<FunctionDecl>(rawPtr);
                m_functions.append(makeUniqueRefFromNonNullUniquePtr(std::unique_ptr<FunctionDecl>(func)));
            }
        }
    }

    Vector<UniqueRef<GlobalDirective>>& directives() { return m_directives; }
    Vector<UniqueRef<StructDecl>>& structs() { return m_structs; }
    Vector<UniqueRef<GlobalVariableDecl>>& globalVars() { return m_globalVars; }
    Vector<UniqueRef<FunctionDecl>>& functions() { return m_functions; }

private:
    Vector<UniqueRef<GlobalDirective>> m_directives;

    Vector<UniqueRef<StructDecl>> m_structs;
    Vector<UniqueRef<GlobalVariableDecl>> m_globalVars;
    Vector<UniqueRef<FunctionDecl>> m_functions;
};

} // namespace WGSL::AST