Build everything as C++ (#1176)

include/asm/rpn.hpp

@@ -0,0 +1,62 @@
+/* SPDX-License-Identifier: MIT */
+
+#ifndef RGBDS_ASM_RPN_H
+#define RGBDS_ASM_RPN_H
+
+#include <stdint.h>
+#include <stdbool.h>
+
+#include "linkdefs.hpp"
+
+#define MAXRPNLEN 1048576
+
+struct Expression {
+	int32_t  val;          // If the expression's value is known, it's here
+	char     *reason;      // Why the expression is not known, if it isn't
+	bool     isKnown;      // Whether the expression's value is known
+	bool     isSymbol;     // Whether the expression represents a symbol
+	uint8_t  *rpn;         // Array of bytes serializing the RPN expression
+	uint32_t rpnCapacity;  // Size of the `rpn` buffer
+	uint32_t rpnLength;    // Used size of the `rpn` buffer
+	uint32_t rpnPatchSize; // Size the expression will take in the object file
+};
+
+// Determines if an expression is known at assembly time
+static inline bool rpn_isKnown(struct Expression const *expr)
+{
+	return expr->isKnown;
+}
+
+// Determines if an expression is a symbol suitable for const diffing
+static inline bool rpn_isSymbol(const struct Expression *expr)
+{
+	return expr->isSymbol;
+}
+
+void rpn_Symbol(struct Expression *expr, char const *symName);
+void rpn_Number(struct Expression *expr, uint32_t i);
+void rpn_LOGNOT(struct Expression *expr, const struct Expression *src);
+struct Symbol const *rpn_SymbolOf(struct Expression const *expr);
+bool rpn_IsDiffConstant(struct Expression const *src, struct Symbol const *symName);
+void rpn_BinaryOp(enum RPNCommand op, struct Expression *expr,
+		  const struct Expression *src1,
+		  const struct Expression *src2);
+void rpn_HIGH(struct Expression *expr, const struct Expression *src);
+void rpn_LOW(struct Expression *expr, const struct Expression *src);
+void rpn_ISCONST(struct Expression *expr, const struct Expression *src);
+void rpn_UNNEG(struct Expression *expr, const struct Expression *src);
+void rpn_UNNOT(struct Expression *expr, const struct Expression *src);
+void rpn_BankSymbol(struct Expression *expr, char const *symName);
+void rpn_BankSection(struct Expression *expr, char const *sectionName);
+void rpn_BankSelf(struct Expression *expr);
+void rpn_SizeOfSection(struct Expression *expr, char const *sectionName);
+void rpn_StartOfSection(struct Expression *expr, char const *sectionName);
+void rpn_SizeOfSectionType(struct Expression *expr, enum SectionType type);
+void rpn_StartOfSectionType(struct Expression *expr, enum SectionType type);
+void rpn_Free(struct Expression *expr);
+void rpn_CheckHRAM(struct Expression *expr, const struct Expression *src);
+void rpn_CheckRST(struct Expression *expr, const struct Expression *src);
+void rpn_CheckNBit(struct Expression const *expr, uint8_t n);
+int32_t rpn_GetConstVal(struct Expression const *expr);
+
+#endif // RGBDS_ASM_RPN_H