Add tile info dump function and assert variants

src/map.cpp

@@ -387,3 +387,43 @@ uint GetClosestWaterDistance(TileIndex tile, bool water)
 
 	return max_dist;
 }
+
+char *DumpTileInfo(char *b, const char *last, TileIndex tile)
+{
+	static const char *tile_type_names[16] = {
+		"MP_CLEAR",
+		"MP_RAILWAY",
+		"MP_ROAD",
+		"MP_HOUSE",
+		"MP_TREES",
+		"MP_STATION",
+		"MP_WATER",
+		"MP_VOID",
+		"MP_INDUSTRY",
+		"MP_TUNNELBRIDGE",
+		"MP_OBJECT",
+		"INVALID_B",
+		"INVALID_C",
+		"INVALID_D",
+		"INVALID_E",
+		"INVALID_F",
+	};
+
+	if (tile == INVALID_TILE) {
+		b += seprintf(b, last, "tile: %X (INVALID_TILE)", tile);
+	} else {
+		b += seprintf(b, last, "tile: %X (%u x %u)", tile, TileX(tile), TileY(tile));
+	}
+	if (!_m || !_me) {
+		b += seprintf(b, last, ", NO MAP ALLOCATED");
+	} else {
+		if (tile >= MapSize()) {
+			b += seprintf(b, last, ", TILE OUTSIDE MAP");
+		} else {
+			b += seprintf(b, last, ", type: %02X (%s), height: %02X, data: %02X %04X %02X %02X %02X %02X %02X",
+					_m[tile].type, tile_type_names[GB(_m[tile].type, 4, 4)], _m[tile].height,
+					_m[tile].m1, _m[tile].m2, _m[tile].m3, _m[tile].m4, _m[tile].m5, _me[tile].m6, _me[tile].m7);
+		}
+	}
+	return b;
+}

src/map_func.h

@@ -426,4 +426,6 @@ static inline TileIndex RandomTileSeed(uint32 r)
 
 uint GetClosestWaterDistance(TileIndex tile, bool water);
 
+char *DumpTileInfo(char *b, const char *last, TileIndex tile);
+
 #endif /* MAP_FUNC_H */

src/openttd.cpp

@@ -124,7 +124,7 @@ void CDECL error(const char *s, ...)
 	abort();
 }
 
-void CDECL assert_msg_error(int line, const char *file, const char *expr, const char *str, ...)
+void CDECL assert_msg_error(int line, const char *file, const char *expr, const char *extra, const char *str, ...)
 {
 	va_list va;
 	char buf[2048];
@@ -132,6 +132,10 @@ void CDECL assert_msg_error(int line, const char *file, const char *expr, const
 	char *b = buf;
 	b += seprintf(b, lastof(buf), "Assertion failed at line %i of %s: %s\n\t", line, file, expr);
 
+	if (extra != nullptr) {
+		b += seprintf(b, lastof(buf), "%s\n\t", extra);
+	}
+
 	va_start(va, str);
 	vseprintf(b, lastof(buf), str, va);
 	va_end(va);
@@ -143,6 +147,12 @@ void CDECL assert_msg_error(int line, const char *file, const char *expr, const
 	abort();
 }
 
+const char *assert_tile_info(uint32 tile) {
+	static char buffer[128];
+	DumpTileInfo(buffer, lastof(buffer), tile);
+	return buffer;
+}
+
 /**
  * Shows some information on the console/a popup box depending on the OS.
  * @param str the text to show.

src/stdafx.h

@@ -458,7 +458,8 @@ assert_compile(SIZE_MAX >= UINT32_MAX);
 
 void NORETURN CDECL usererror(const char *str, ...) WARN_FORMAT(1, 2);
 void NORETURN CDECL error(const char *str, ...) WARN_FORMAT(1, 2);
-void NORETURN CDECL assert_msg_error(int line, const char *file, const char *expr, const char *str, ...) WARN_FORMAT(4, 5);
+void NORETURN CDECL assert_msg_error(int line, const char *file, const char *expr, const char *extra, const char *str, ...) WARN_FORMAT(5, 6);
+const char *assert_tile_info(uint32 tile);
 #define NOT_REACHED() error("NOT_REACHED triggered at line %i of %s", __LINE__, __FILE__)
 
 /* For non-debug builds with assertions enabled use the special assertion handler:
@@ -473,9 +474,13 @@ void NORETURN CDECL assert_msg_error(int line, const char *file, const char *exp
 /* Asserts are enabled if NDEBUG isn't defined, or if we are using MSVC and WITH_ASSERT is defined. */
 #if !defined(NDEBUG) || (defined(_MSC_VER) && defined(WITH_ASSERT))
 	#define OTTD_ASSERT
-	#define assert_msg(expression, ...) if (unlikely(!(expression))) assert_msg_error(__LINE__, __FILE__, #expression, __VA_ARGS__);
+	#define assert_msg(expression, ...) if (unlikely(!(expression))) assert_msg_error(__LINE__, __FILE__, #expression, nullptr, __VA_ARGS__);
+	#define assert_msg_tile(expression, tile, ...) if (unlikely(!(expression))) assert_msg_error(__LINE__, __FILE__, #expression, assert_tile_info(tile), __VA_ARGS__);
+	#define assert_tile(expression, tile) if (unlikely(!(expression))) error("Assertion failed at line %i of %s: %s\n\t%s", __LINE__, __FILE__, #expression, assert_tile_info(tile));
 #else
 	#define assert_msg(expression, ...)
+	#define assert_msg_tile(expression, tile, ...)
+	#define assert_tile(expression, tile)
 #endif
 
 #if defined(MORPHOS) || defined(__NDS__) || defined(__DJGPP__)