From 26c5b458a067388da968465ba9e102a084bf7a2c Mon Sep 17 00:00:00 2001
From: Bad Diode <bd@badd10de.dev>
Date: Tue, 26 Oct 2021 16:26:25 +0200
Subject: Add stack trace for function call debugging

---
 src/bytecode/vm.h | 17 +++++++++++++++++
 1 file changed, 17 insertions(+)

(limited to 'src/bytecode')

diff --git a/src/bytecode/vm.h b/src/bytecode/vm.h
index 33582b1..3f59aff 100755
--- a/src/bytecode/vm.h
+++ b/src/bytecode/vm.h
@@ -60,6 +60,22 @@ vm_reset(VM *vm) {
 }
 
 // Helper macros for a more clear VM switch.
+#ifdef DEBUG
+#define STACK_TRACE() \
+    fprintf(stderr, "stack trace:\n"); \
+    for (ssize_t i = array_size(vm->frames) - 1; i >= 0 ; i--) { \
+        CallFrame frame = vm->frames[i]; \
+        Chunk *chunk = frame.chunk; \
+        size_t instruction = vm->pc - chunk->code - 1; \
+        fprintf(stderr, "\t%-4ld  ->  ", i); \
+        fprintf(stderr, "%.*s",(int)array_size(chunk->name), chunk->name); \
+        fprintf(stderr, ":%ld:%ld\n", chunk->lines[instruction].line, chunk->lines[instruction].col); \
+        vm->pc = frame.rp; \
+    }
+#else
+#define STACK_TRACE()
+#endif
+
 #define RUNTIME_ERROR(ERR) \
     error_push((Error){ \
         .type = ERR_TYPE_RUNTIME, \
@@ -67,6 +83,7 @@ vm_reset(VM *vm) {
         .line = frame->chunk->lines[vm->pc - frame->chunk->code - 1].line, \
         .col = frame->chunk->lines[vm->pc - frame->chunk->code - 1].col, \
     }); \
+    STACK_TRACE() \
     return
 
 #define FIXNUM_ARITHMETIC_OP(OP) \
-- 
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