@@ -395,6 +395,7 @@ # Features
 set(DEBUGGER_SRC
 	${CMAKE_CURRENT_SOURCE_DIR}/src/debugger/debugger.c
 	${CMAKE_CURRENT_SOURCE_DIR}/src/debugger/parser.c
+	${CMAKE_CURRENT_SOURCE_DIR}/src/debugger/symbols.c
 	${CMAKE_CURRENT_SOURCE_DIR}/src/debugger/cli-debugger.c)
 
 set(FEATURE_SRC)
@@ -603,7 +604,8 @@ ${GB_RENDERER_SRC})
 	list(APPEND DEBUGGER_SRC
 		${CMAKE_CURRENT_SOURCE_DIR}/src/lr35902/debugger/cli-debugger.c
 		${CMAKE_CURRENT_SOURCE_DIR}/src/lr35902/debugger/debugger.c
-		${CMAKE_CURRENT_SOURCE_DIR}/src/gb/debugger/cli.c)
+		${CMAKE_CURRENT_SOURCE_DIR}/src/gb/debugger/cli.c
+		${CMAKE_CURRENT_SOURCE_DIR}/src/gb/debugger/symbols.c)
 	list(APPEND TEST_SRC
 		${LR35902_TEST_SRC}
 		${GB_TEST_SRC})

@@ -39,12 +39,14 @@ };
 
 struct mCoreConfig;
 struct mCoreSync;
+struct mDebuggerSymbols;
 struct mStateExtdata;
 struct mVideoLogContext;
 struct mCore {
 	void* cpu;
 	void* board;
 	struct mDebugger* debugger;
+	struct mDebuggerSymbols* symbolTable;
 
 #if !defined(MINIMAL_CORE) || MINIMAL_CORE < 2
 	struct mDirectorySet dirs;
@@ -135,6 +137,8 @@ struct mDebuggerPlatform* (*debuggerPlatform)(struct mCore*);
 	struct CLIDebuggerSystem* (*cliDebuggerSystem)(struct mCore*);
 	void (*attachDebugger)(struct mCore*, struct mDebugger*);
 	void (*detachDebugger)(struct mCore*);
+
+	void (*loadSymbols)(struct mCore*, struct VFile*);
 #endif
 
 	struct mCheatDevice* (*cheatDevice)(struct mCore*);

@@ -94,6 +94,7 @@ void (*clearWatchpoint)(struct mDebuggerPlatform*, uint32_t address);
 	void (*checkBreakpoints)(struct mDebuggerPlatform*);
 };
 
+struct mDebuggerSymbols;
 struct mDebugger {
 	struct mCPUComponent d;
 	struct mDebuggerPlatform* platform;

@@ -0,0 +1,25 @@
+/* Copyright (c) 2013-2017 Jeffrey Pfau
+ *
+ * This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
+#ifndef DEBUGGER_SYMBOLS_H
+#define DEBUGGER_SYMBOLS_H
+
+#include <mgba-util/common.h>
+
+CXX_GUARD_START
+
+struct mDebuggerSymbols;
+
+struct mDebuggerSymbols* mDebuggerSymbolTableCreate(void);
+void mDebuggerSymbolTableDestroy(struct mDebuggerSymbols*);
+
+bool mDebuggerSymbolLookup(const struct mDebuggerSymbols*, const char* name, int32_t* value, int* segment);
+
+void mDebuggerSymbolAdd(struct mDebuggerSymbols*, const char* name, int32_t value, int segment);
+void mDebuggerSymbolRemove(struct mDebuggerSymbols*, const char* name);
+
+CXX_GUARD_END
+
+#endif

@@ -0,0 +1,19 @@
+/* Copyright (c) 2013-2017 Jeffrey Pfau
+ *
+ * This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
+#ifndef GB_SYMBOLS_H
+#define GB_SYMBOLS_H
+
+#include <mgba-util/common.h>
+
+CXX_GUARD_START
+
+struct mDebuggerSymbols;
+struct VFile;
+void GBLoadSymbols(struct mDebuggerSymbols*, struct VFile* vf);
+
+CXX_GUARD_END
+
+#endif

@@ -5,6 +5,8 @@ * License, v. 2.0. If a copy of the MPL was not distributed with this
  * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
 #include <mgba/internal/debugger/cli-debugger.h>
 
+#include <mgba/internal/debugger/symbols.h>
+
 #include <mgba/core/core.h>
 #include <mgba/core/version.h>
 #include <mgba/internal/debugger/parser.h>
@@ -497,7 +499,11 @@
 static void _lookupIdentifier(struct mDebugger* debugger, const char* name, struct CLIDebugVector* dv) {
 	struct CLIDebugger* cliDebugger = (struct CLIDebugger*) debugger;
 	if (cliDebugger->system) {
-		uint32_t value = cliDebugger->system->lookupPlatformIdentifier(cliDebugger->system, name, dv);
+		uint32_t value;
+		if (debugger->core->symbolTable && mDebuggerSymbolLookup(debugger->core->symbolTable, name, &dv->intValue, &dv->segmentValue)) {
+			return;
+		}
+		value = cliDebugger->system->lookupPlatformIdentifier(cliDebugger->system, name, dv);
 		if (dv->type != CLIDV_ERROR_TYPE) {
 			dv->intValue = value;
 			return;

@@ -62,6 +62,9 @@ debugger->d.id = DEBUGGER_ID;
 	debugger->d.init = mDebuggerInit;
 	debugger->d.deinit = mDebuggerDeinit;
 	debugger->core = core;
+	if (!debugger->core->symbolTable) {
+		debugger->core->loadSymbols(debugger->core, NULL);
+	}
 	debugger->platform = core->debuggerPlatform(core);
 	debugger->platform->p = debugger;
 	core->attachDebugger(core, debugger);

@@ -0,0 +1,49 @@
+/* Copyright (c) 2013-2017 Jeffrey Pfau
+ *
+ * This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
+#include <mgba/internal/debugger/symbols.h>
+
+#include <mgba-util/table.h>
+
+struct mDebuggerSymbol {
+	int32_t value;
+	int segment;
+};
+
+struct mDebuggerSymbols {
+	struct Table names;
+};
+
+struct mDebuggerSymbols* mDebuggerSymbolTableCreate(void) {
+	struct mDebuggerSymbols* st = malloc(sizeof(*st));
+	HashTableInit(&st->names, 0, free);
+	return st;
+}
+
+void mDebuggerSymbolTableDestroy(struct mDebuggerSymbols* st) {
+	HashTableDeinit(&st->names);
+	free(st);
+}
+
+bool mDebuggerSymbolLookup(const struct mDebuggerSymbols* st, const char* name, int32_t* value, int* segment) {
+	struct mDebuggerSymbol* sym = HashTableLookup(&st->names, name);
+	if (!sym) {
+		return false;
+	}
+	*value = sym->value;
+	*segment = sym->segment;
+	return true;
+}
+
+void mDebuggerSymbolAdd(struct mDebuggerSymbols* st, const char* name, int32_t value, int segment) {
+	struct mDebuggerSymbol* sym = malloc(sizeof(*sym));
+	sym->value = value;
+	sym->segment = segment;
+	HashTableInsert(&st->names, name, sym);
+}
+
+void mDebuggerSymbolRemove(struct mDebuggerSymbols* st, const char* name) {
+	HashTableRemove(&st->names, name);
+}

@@ -6,7 +6,9 @@ * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
 #include <mgba/gb/core.h>
 
 #include <mgba/core/core.h>
+#include <mgba/internal/debugger/symbols.h>
 #include <mgba/internal/gb/cheats.h>
+#include <mgba/internal/gb/debugger/symbols.h>
 #include <mgba/internal/gb/extra/cli.h>
 #include <mgba/internal/gb/io.h>
 #include <mgba/internal/gb/gb.h>
@@ -90,8 +92,11 @@ LR35902Deinit(core->cpu);
 	GBDestroy(core->board);
 	mappedMemoryFree(core->cpu, sizeof(struct LR35902Core));
 	mappedMemoryFree(core->board, sizeof(struct GB));
-#if !defined(MINIMAL_CORE) || MINIMAL_CORE < 2
+#if defined USE_DEBUGGERS && (!defined(MINIMAL_CORE) || MINIMAL_CORE < 2)
 	mDirectorySetDeinit(&core->dirs);
+	if (core->symbolTable) {
+		mDebuggerSymbolTableDestroy(core->symbolTable);
+	}
 #endif
 
 	struct GBCore* gbcore = (struct GBCore*) core;
@@ -552,6 +557,19 @@ }
 	cpu->components[CPU_COMPONENT_DEBUGGER] = NULL;
 	core->debugger = NULL;
 }
+
+static void _GBCoreLoadSymbols(struct mCore* core, struct VFile* vf) {
+	core->symbolTable = mDebuggerSymbolTableCreate();
+#if !defined(MINIMAL_CORE) || MINIMAL_CORE < 2
+	if (!vf) {
+		vf = mDirectorySetOpenSuffix(&core->dirs, core->dirs.base, ".sym", O_RDONLY);
+	}
+#endif
+	if (!vf) {
+		return;
+	}
+	GBLoadSymbols(core->symbolTable, vf);
+}
 #endif
 
 static struct mCheatDevice* _GBCoreCheatDevice(struct mCore* core) {
@@ -671,6 +689,7 @@ memset(&core->opts, 0, sizeof(core->opts));
 	core->cpu = NULL;
 	core->board = NULL;
 	core->debugger = NULL;
+	core->symbolTable = NULL;
 	core->init = _GBCoreInit;
 	core->deinit = _GBCoreDeinit;
 	core->platform = _GBCorePlatform;
@@ -728,6 +747,7 @@ core->debuggerPlatform = _GBCoreDebuggerPlatform;
 	core->cliDebuggerSystem = _GBCoreCliDebuggerSystem;
 	core->attachDebugger = _GBCoreAttachDebugger;
 	core->detachDebugger = _GBCoreDetachDebugger;
+	core->loadSymbols = _GBCoreLoadSymbols;
 #endif
 	core->cheatDevice = _GBCoreCheatDevice;
 	core->savedataClone = _GBCoreSavedataClone;

@@ -0,0 +1,55 @@
+/* Copyright (c) 2013-2016 Jeffrey Pfau
+ *
+ * This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
+#include <mgba/internal/gb/debugger/symbols.h>
+
+#include <mgba/internal/debugger/symbols.h>
+#include <mgba-util/string.h>
+#include <mgba-util/vfs.h>
+
+void GBLoadSymbols(struct mDebuggerSymbols* st, struct VFile* vf) {
+	char line[512];
+
+	while (true) {
+		ssize_t bytesRead = vf->readline(vf, line, sizeof(line));
+		if (bytesRead <= 0) {
+			break;
+		}
+		if (line[bytesRead - 1] == '\n') {
+			line[bytesRead - 1] = '\0';
+		}
+		int segment = -1;
+		uint32_t address = 0;
+
+		uint8_t byte;
+		const char* buf = line;
+		while (buf) {
+			buf = hex8(buf, &byte);
+			if (!buf) {
+				break;
+			}
+			address <<= 8;
+			address += byte;
+
+			if (buf[0] == ':') {
+				segment = address;
+				address = 0;
+				++buf;
+			}
+			if (isspace((int) buf[0])) {
+				break;
+			}
+		}
+		if (!buf) {
+			continue;
+		}
+
+		while (isspace((int) buf[0])) {
+			++buf;
+		}
+
+		mDebuggerSymbolAdd(st, buf, address, segment);
+	}
+}

@@ -72,6 +72,7 @@ }
 	core->cpu = cpu;
 	core->board = gba;
 	core->debugger = NULL;
+	core->symbolTable = NULL;
 	gbacore->overrides = NULL;
 	gbacore->debuggerPlatform = NULL;
 	gbacore->cheatDevice = NULL;
@@ -555,6 +556,10 @@ static void _GBACoreDetachDebugger(struct mCore* core) {
 	GBADetachDebugger(core->board);
 	core->debugger = NULL;
 }
+
+static void _GBACoreLoadSymbols(struct mCore* core, struct VFile* vf) {
+	// TODO
+}
 #endif
 
 static struct mCheatDevice* _GBACoreCheatDevice(struct mCore* core) {
@@ -747,6 +752,7 @@ core->debuggerPlatform = _GBACoreDebuggerPlatform;
 	core->cliDebuggerSystem = _GBACoreCliDebuggerSystem;
 	core->attachDebugger = _GBACoreAttachDebugger;
 	core->detachDebugger = _GBACoreDetachDebugger;
+	core->loadSymbols = _GBACoreLoadSymbols;
 #endif
 	core->cheatDevice = _GBACoreCheatDevice;
 	core->savedataClone = _GBACoreSavedataClone;