Chapter 19.3

clox/src/CMakeLists.txt

@@ -15,6 +15,7 @@ add_executable(Lox
   scanner.h
   scanner.c
   object.h
+  object.c
   main.c)
 
 install(TARGETS Lox)

clox/src/compiler.c

@@ -190,6 +190,11 @@ static void number() {
   emitConstant(NUMBER_VAL(value));
 }
 
+static void string() {
+  emitConstant(OBJ_VAL(
+      copyString(parser.previous.start + 1, parser.previous.length - 2)));
+}
+
 static void unary() {
   TokenType operatorType = parser.previous.type;
 
@@ -235,7 +240,7 @@ ParseRule rules[] = {
     [TOKEN_LESS] = {NULL, binary, PREC_COMPARISON},
     [TOKEN_LESS_EQUAL] = {NULL, binary, PREC_COMPARISON},
     [TOKEN_IDENTIFIER] = {NULL, NULL, PREC_NONE},
-    [TOKEN_STRING] = {NULL, NULL, PREC_NONE},
+    [TOKEN_STRING] = {string, NULL, PREC_NONE},
     [TOKEN_NUMBER] = {number, NULL, PREC_NONE},
     [TOKEN_AND] = {NULL, NULL, PREC_NONE},
     [TOKEN_CLASS] = {NULL, NULL, PREC_NONE},

clox/src/compiler.h

@@ -1,6 +1,7 @@
 #ifndef COMPILER_H
 #define COMPILER_H
 
+#include "object.h"
 #include "vm.h"
 
 bool compile(const char *source, Chunk *chunk);

clox/src/memory.h

@@ -3,16 +3,18 @@
 
 #include "common.h"
 
-#define GROW_CAPACITY(capacity) \
+#define ALLOCATE(type, count)                                                  \
-  ((capacity) < 8 ? 8 : (capacity) * 2)
+  (type *)reallocate(NULL, 0, sizeof(type) * (count))
 
-#define GROW_ARRAY(type, pointer, oldCount, newCount) \
+#define GROW_CAPACITY(capacity) ((capacity) < 8 ? 8 : (capacity)*2)
-  (type*)reallocate(pointer, sizeof(type) * (oldCount), \
-                    sizeof(type) * (newCount))
 
-#define FREE_ARRAY(type, pointer, oldCount) \
+#define GROW_ARRAY(type, pointer, oldCount, newCount)                          \
+  (type *)reallocate(pointer, sizeof(type) * (oldCount),                       \
+                     sizeof(type) * (newCount))
+
+#define FREE_ARRAY(type, pointer, oldCount)                                    \
   reallocate(pointer, sizeof(type) * (oldCount), 0)
 
-void* reallocate(void* pointer, size_t oldSize, size_t newSize);
+void *reallocate(void *pointer, size_t oldSize, size_t newSize);
 
 #endif

clox/src/object.h

@@ -25,6 +25,8 @@ struct ObjString {
   char *chars;
 };
 
+ObjString *copyString(const char *chars, int length);
+
 static inline bool isObjType(Value value, ObjType type) {
   return IS_OBJ(value) && AS_OBJ(value)->type == type;
 }