add line numbers

src/chunk.c

@@ -6,23 +6,28 @@ void newChunk(Chunk* chunk) {
   chunk->count = 0;
   chunk->capacity = 0;
   chunk->code = NULL;
+  chunk->lines = NULL;
   newValueArray(&chunk->constants);
 }
 
-void writeChunk(Chunk *chunk, uint8_t byte) {
+void writeChunk(Chunk *chunk, uint8_t byte, int line) {
   if (chunk->capacity < chunk->count + 1) {
     int oldCapacity = chunk->capacity;
     chunk->capacity = GROW_CAPACITY(oldCapacity);
     chunk->code = GROW_ARRAY(uint8_t, chunk->code,
         oldCapacity, chunk->capacity);
+    chunk->lines = GROW_ARRAY(int, chunk->lines,
+        oldCapacity, chunk->capacity);
   }
 
   chunk->code[chunk->count] = byte;
+  chunk->lines[chunk->count] = line;
   chunk->count++;
 }
 
 void freeChunk(Chunk *chunk) {
   FREE_ARRAY(uint8_t, chunk->code, chunk->capacity);
+  FREE_ARRAY(int, chunk->lines, chunk->capacity);
   freeValueArray(&chunk->constants);
   newChunk(chunk);
 }

src/chunk.h

@@ -15,12 +15,13 @@ typedef struct Chunk {
   int count;
   int capacity;
   uint8_t *code;
+  int *lines;
   ValueArray constants;
 } Chunk;
 
 void newChunk(Chunk *chunk);
 void freeChunk(Chunk *chunk);
-void writeChunk(Chunk *chunk, uint8_t byte);
+void writeChunk(Chunk *chunk, uint8_t byte, int line);
 int addConstant(Chunk *chunk, Value value);
 
 #endif

src/debug.c

@@ -27,6 +27,12 @@ static int simpleInstruction(const char* name, int offset) {
 
 int disassembleInstruction(Chunk* chunk, int offset) {
   printf("%04d ", offset);
+  if (offset > 0 &&
+      chunk->lines[offset] == chunk->lines[offset - 1]) {
+    printf("   | ");
+  } else {
+    printf("%4d ", chunk->lines[offset]);
+  }
 
   uint8_t instruction = chunk->code[offset];
   switch (instruction) {

src/main.c

@@ -7,10 +7,10 @@ int main(int argc, const char** argv) {
   newChunk(&chunk);
 
   int constant = addConstant(&chunk, 1.2);
-  writeChunk(&chunk, OP_CONSTANT);
-  writeChunk(&chunk, constant);
+  writeChunk(&chunk, OP_CONSTANT, 1);
+  writeChunk(&chunk, constant, 1);
 
-  writeChunk(&chunk, OP_RETURN);
+  writeChunk(&chunk, OP_RETURN, 1);
 
   disassembleChunk(&chunk, "test chunk");
   freeChunk(&chunk);