Use std::shared_ptr<std::string> for lexed/parsed strings

include/asm/lexer.hpp

@@ -4,6 +4,7 @@
 #define RGBDS_ASM_LEXER_H
 
 #include <deque>
+#include <memory>
 #include <optional>
 #include <stdint.h>
 #include <string>
@@ -31,13 +32,10 @@ enum LexerMode {
 
 struct Expansion {
 	std::optional<std::string> name;
-	union {
-		char const *unowned;
-		char *owned; // Non-`const` only so it can be `delete []`d
-	} contents;
-	size_t size;   // Length of the contents
+	std::shared_ptr<std::string> contents;
 	size_t offset; // Cursor into the contents
-	bool owned;    // Whether or not to free contents when this expansion is freed
+
+	size_t size() const { return contents->size(); }
 };
 
 struct IfStackEntry {
@@ -140,10 +138,6 @@ struct CaptureBody {
 	size_t size;
 };
 
-struct String {
-	char string[MAXSTRLEN + 1];
-};
-
 void lexer_CheckRecursionDepth();
 uint32_t lexer_GetLineNo();
 uint32_t lexer_GetColNo();

include/asm/macro.hpp

@@ -3,26 +3,22 @@
 #ifndef RGBDS_MACRO_H
 #define RGBDS_MACRO_H
 
+#include <memory>
 #include <stdint.h>
-#include <stdlib.h>
 #include <string>
 #include <vector>
 
-#include "helpers.hpp"
-
-#include "asm/warning.hpp"
-
 struct MacroArgs {
 	unsigned int shift;
-	std::vector<std::string> args;
+	std::vector<std::shared_ptr<std::string>> args;
 
-	void append(std::string s);
+	void append(std::shared_ptr<std::string> arg);
 };
 
 MacroArgs *macro_GetCurrentArgs();
 void macro_UseNewArgs(MacroArgs *args);
-char const *macro_GetArg(uint32_t i);
-char const *macro_GetAllArgs();
+std::shared_ptr<std::string> macro_GetArg(uint32_t i);
+std::shared_ptr<std::string> macro_GetAllArgs();
 
 void macro_ShiftCurrentArgs(int32_t count);
 uint32_t macro_NbArgs();

include/asm/symbol.hpp

@@ -36,10 +36,10 @@ struct Symbol {
 	uint32_t fileLine;                  // Line where the symbol was defined
 
 	std::variant<
-	    int32_t,            // If isNumeric()
-	    int32_t (*)(),      // If isNumeric() and has a callback
-	    std::string_view *, // For SYM_MACRO
-	    std::string *       // For SYM_EQUS
+	    int32_t,                     // If isNumeric()
+	    int32_t (*)(),               // If isNumeric() and has a callback
+	    std::string_view *,          // For SYM_MACRO
+	    std::shared_ptr<std::string> // For SYM_EQUS
 	    >
 	    data;
 
@@ -62,7 +62,7 @@ struct Symbol {
 	int32_t getValue() const;
 	int32_t getOutputValue() const;
 	std::string_view *getMacro() const;
-	std::string *getEqus() const;
+	std::shared_ptr<std::string> getEqus() const;
 	uint32_t getConstantValue() const;
 };
 
@@ -90,8 +90,8 @@ Symbol *sym_FindScopedValidSymbol(std::string const &symName);
 Symbol const *sym_GetPC();
 Symbol *sym_AddMacro(std::string const &symName, int32_t defLineNo, char const *body, size_t size);
 Symbol *sym_Ref(std::string const &symName);
-Symbol *sym_AddString(std::string const &symName, char const *value);
-Symbol *sym_RedefString(std::string const &symName, char const *value);
+Symbol *sym_AddString(std::string const &symName, std::shared_ptr<std::string> value);
+Symbol *sym_RedefString(std::string const &symName, std::shared_ptr<std::string> value);
 void sym_Purge(std::string const &symName);
 void sym_Init(time_t now);