ref: a52a00a9ca7753ef41814b55878b510e8dc80b7b
dir: /include/asm/symbol.h/
/* * This file is part of RGBDS. * * Copyright (c) 1997-2020, Carsten Sorensen and RGBDS contributors. * * SPDX-License-Identifier: MIT */ #ifndef RGBDS_SYMBOL_H #define RGBDS_SYMBOL_H #include <stdbool.h> #include <stdint.h> #include <string.h> #include <time.h> #include "asm/section.h" #include "platform.h" // MIN_NB_ELMS #define MAXSYMLEN 255 enum SymbolType { SYM_LABEL, SYM_EQU, SYM_VAR, SYM_MACRO, SYM_EQUS, SYM_REF // Forward reference to a label }; struct Symbol { char name[MAXSYMLEN + 1]; enum SymbolType type; bool isExported; // Whether the symbol is to be exported bool isBuiltin; // Whether the symbol is a built-in struct Section *section; struct FileStackNode *src; // Where the symbol was defined uint32_t fileLine; // Line where the symbol was defined bool hasCallback; union { // If sym_IsNumeric int32_t value; int32_t (*numCallback)(void); // For SYM_MACRO and SYM_EQUS; TODO: have separate fields struct { size_t macroSize; char *macro; }; // For SYM_EQUS char const *(*strCallback)(void); }; uint32_t ID; // ID of the symbol in the object file (-1 if none) struct Symbol *next; // Next object to output in the object file }; bool sym_IsPC(struct Symbol const *sym); static inline bool sym_IsDefined(struct Symbol const *sym) { return sym->type != SYM_REF; } static inline struct Section *sym_GetSection(struct Symbol const *sym) { return sym_IsPC(sym) ? sect_GetSymbolSection() : sym->section; } static inline bool sym_IsConstant(struct Symbol const *sym) { if (sym->type == SYM_LABEL) { struct Section const *sect = sym_GetSection(sym); return sect && sect->org != (uint32_t)-1; } return sym->type == SYM_EQU || sym->type == SYM_VAR; } static inline bool sym_IsNumeric(struct Symbol const *sym) { return sym->type == SYM_LABEL || sym->type == SYM_EQU || sym->type == SYM_VAR; } static inline bool sym_IsLabel(struct Symbol const *sym) { return sym->type == SYM_LABEL || sym->type == SYM_REF; } static inline bool sym_IsLocal(struct Symbol const *sym) { return sym_IsLabel(sym) && strchr(sym->name, '.'); } static inline bool sym_IsExported(struct Symbol const *sym) { return sym->isExported; } // Get a string equate's value static inline char const *sym_GetStringValue(struct Symbol const *sym) { if (sym->hasCallback) return sym->strCallback(); return sym->macro; } void sym_ForEach(void (*func)(struct Symbol *, void *), void *arg); int32_t sym_GetValue(struct Symbol const *sym); void sym_SetExportAll(bool set); struct Symbol *sym_AddLocalLabel(char const *symName); struct Symbol *sym_AddLabel(char const *symName); struct Symbol *sym_AddAnonLabel(void); void sym_WriteAnonLabelName(char buf[MIN_NB_ELMS(MAXSYMLEN + 1)], uint32_t ofs, bool neg); void sym_Export(char const *symName); struct Symbol *sym_AddEqu(char const *symName, int32_t value); struct Symbol *sym_RedefEqu(char const *symName, int32_t value); struct Symbol *sym_AddVar(char const *symName, int32_t value); uint32_t sym_GetPCValue(void); uint32_t sym_GetConstantSymValue(struct Symbol const *sym); uint32_t sym_GetConstantValue(char const *symName); // Find a symbol by exact name, bypassing expansion checks struct Symbol *sym_FindExactSymbol(char const *symName); // Find a symbol by exact name; may not be scoped, produces an error if it is struct Symbol *sym_FindUnscopedSymbol(char const *symName); // Find a symbol, possibly scoped, by name struct Symbol *sym_FindScopedSymbol(char const *symName); struct Symbol const *sym_GetPC(void); struct Symbol *sym_AddMacro(char const *symName, int32_t defLineNo, char *body, size_t size); struct Symbol *sym_Ref(char const *symName); struct Symbol *sym_AddString(char const *symName, char const *value); struct Symbol *sym_RedefString(char const *symName, char const *value); void sym_Purge(char const *symName); void sym_Init(time_t now); // Functions to save and restore the current symbol scope. char const *sym_GetCurrentSymbolScope(void); void sym_SetCurrentSymbolScope(char const *newScope); #endif // RGBDS_SYMBOL_H