Chapter 14.1-6

1 files changed, 46 insertions, 0 deletions

diff --git a/clox/src/debug.c b/clox/src/debug.c
new file mode 100644
index 0000000..68fdbc5
--- /dev/null
+++ b/clox/src/debug.c
@@ -0,0 +1,46 @@
+#include <stdio.h>
+
+#include "debug.h"
+#include "value.h"
+
+void disassembleChunk(Chunk* chunk, const char* name) {
+  printf("== %s ==\n", name);
+
+  for (int offset = 0; offset < chunk->count;) {
+    offset = disassembleInstruction(chunk, offset);
+  }
+}
+
+static int constantInstruction(const char* name, Chunk* chunk, int offset) {
+  uint8_t constant = chunk->code[offset + 1];
+  printf("%-16s %4d '", name, constant);
+  printValue(chunk->constants.values[constant]);
+  printf("'\n");
+  return offset + 2;
+}
+
+static int simpleInstruction(const char* name, int offset) {
+  printf("%s\n", name);
+  return offset + 1;
+}
+
+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) {
+  case OP_CONSTANT:
+    return constantInstruction("OP_CONSTANT", chunk, offset);
+  case OP_RETURN:
+    return simpleInstruction("OP_RETURN", offset);
+  default:
+    printf("Unknown opcode %d\n", instruction);
+    return offset + 1;
+  }
+}