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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
70 lines
1.9 KiB
C++
70 lines
1.9 KiB
C++
/* SPDX-License-Identifier: MIT */
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#ifndef RGBDS_ASM_RPN_HPP
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#define RGBDS_ASM_RPN_HPP
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#include <stdint.h>
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#include <string>
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#include <vector>
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#include "either.hpp"
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#include "linkdefs.hpp"
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struct Symbol;
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struct Expression {
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Either<
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int32_t, // If the expression's value is known, it's here
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std::string // Why the expression is not known, if it isn't
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>
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data = 0;
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bool isSymbol = false; // Whether the expression represents a symbol suitable for const diffing
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std::vector<uint8_t> rpn{}; // Bytes serializing the RPN expression
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uint32_t rpnPatchSize = 0; // Size the expression will take in the object file
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Expression() = default;
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Expression(Expression &&) = default;
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#ifdef _MSC_VER
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// MSVC and WinFlexBison won't build without this...
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Expression(Expression const &) = default;
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#endif
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Expression &operator=(Expression &&) = default;
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bool isKnown() const {
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return data.holds<int32_t>();
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}
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int32_t value() const {
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return data.get<int32_t>();
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}
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int32_t getConstVal() const;
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Symbol const *symbolOf() const;
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bool isDiffConstant(Symbol const *symName) const;
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void makeNumber(uint32_t value);
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void makeSymbol(std::string const &symName);
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void makeBankSymbol(std::string const &symName);
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void makeBankSection(std::string const §Name);
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void makeSizeOfSection(std::string const §Name);
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void makeStartOfSection(std::string const §Name);
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void makeSizeOfSectionType(SectionType type);
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void makeStartOfSectionType(SectionType type);
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void makeUnaryOp(RPNCommand op, Expression &&src);
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void makeBinaryOp(RPNCommand op, Expression &&src1, Expression const &src2);
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void makeCheckHRAM();
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void makeCheckRST();
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void checkNBit(uint8_t n) const;
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private:
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void clear();
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uint8_t *reserveSpace(uint32_t size);
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uint8_t *reserveSpace(uint32_t size, uint32_t patchSize);
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};
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bool checkNBit(int32_t v, uint8_t n, char const *name);
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#endif // RGBDS_ASM_RPN_HPP
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