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57c3d74b9e
* Implement custom generic tagged union `Either` This should be more efficient than `std::variant`, while still keeping runtime safety as it `assert`s when `get`ting values. * Use `Either` for RPN expressions * Use `Either` for file stack node data * Use `Either` for `File` buffer * Use `Either` for `STRFMT` args * Use `Either` for RGBLINK symbol values * Support an equivalent of `std::monostate` for `Either` * Use `Either` for lexer tokens * Use `Either` for symbol values * Use `Either` for lexer mmap/buffer state
53 lines
1.1 KiB
C++
53 lines
1.1 KiB
C++
/* SPDX-License-Identifier: MIT */
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#ifndef RGBDS_LINK_SYMBOL_HPP
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#define RGBDS_LINK_SYMBOL_HPP
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// GUIDELINE: external code MUST NOT BE AWARE of the data structure used!
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#include <stdint.h>
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#include <string>
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#include "either.hpp"
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#include "linkdefs.hpp"
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struct FileStackNode;
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struct Section;
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struct Label {
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int32_t sectionID;
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int32_t offset;
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// Extra info computed during linking
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Section *section;
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};
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struct Symbol {
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// Info contained in the object files
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std::string name;
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ExportLevel type;
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char const *objFileName;
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FileStackNode const *src;
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int32_t lineNo;
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Either<
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int32_t, // Constants just have a numeric value
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Label // Label values refer to an offset within a specific section
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>
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data;
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Label &label() { return data.get<Label>(); }
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Label const &label() const { return data.get<Label>(); }
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};
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void sym_ForEach(void (*callback)(Symbol &));
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void sym_AddSymbol(Symbol &symbol);
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/*
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* Finds a symbol in all the defined symbols.
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* @param name The name of the symbol to look for
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* @return A pointer to the symbol, or `nullptr` if not found.
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*/
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Symbol *sym_GetSymbol(std::string const &name);
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#endif // RGBDS_LINK_SYMBOL_HPP
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