Build everything as C++ (#1176)

src/link/symbol.cpp

@@ -0,0 +1,62 @@
+/* SPDX-License-Identifier: MIT */
+
+#include <inttypes.h>
+#include <stdbool.h>
+#include <stdlib.h>
+
+#include "link/object.hpp"
+#include "link/symbol.hpp"
+#include "link/main.hpp"
+
+#include "error.hpp"
+#include "hashmap.hpp"
+
+HashMap symbols;
+
+struct ForEachSymbolArg {
+	void (*callback)(struct Symbol *symbol, void *arg);
+	void *arg;
+};
+
+static void forEach(void *symbol, void *arg)
+{
+	struct ForEachSymbolArg *callbackArg = (struct ForEachSymbolArg *)arg;
+
+	callbackArg->callback((struct Symbol *)symbol, callbackArg->arg);
+}
+
+void sym_ForEach(void (*callback)(struct Symbol *, void *), void *arg)
+{
+	struct ForEachSymbolArg callbackArg = { .callback = callback, .arg = arg };
+
+	hash_ForEach(symbols, forEach, &callbackArg);
+}
+
+void sym_AddSymbol(struct Symbol *symbol)
+{
+	// Check if the symbol already exists
+	struct Symbol *other = (struct Symbol *)hash_GetElement(symbols, symbol->name);
+
+	if (other) {
+		fprintf(stderr, "error: \"%s\" both in %s from ", symbol->name, symbol->objFileName);
+		dumpFileStack(symbol->src);
+		fprintf(stderr, "(%" PRIu32 ") and in %s from ",
+			symbol->lineNo, other->objFileName);
+		dumpFileStack(other->src);
+		fprintf(stderr, "(%" PRIu32 ")\n", other->lineNo);
+		exit(1);
+	}
+
+	// If not, add it
+	hash_AddElement(symbols, symbol->name, symbol);
+}
+
+struct Symbol *sym_GetSymbol(char const *name)
+{
+	return (struct Symbol *)hash_GetElement(symbols, name);
+}
+
+void sym_CleanupSymbols(void)
+{
+	hash_EmptyMap(symbols);
+}