From a765e7a2d8d19b62fb1031b2551b6cb75cf84e38 Mon Sep 17 00:00:00 2001
From: J08nY
Date: Wed, 1 Oct 2025 14:30:43 +0200
Subject: Add equivalence test using GDB introspection.

---
 test/gdb_script.py | 87 ++++++++++++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 87 insertions(+)
 create mode 100644 test/gdb_script.py

(limited to 'test/gdb_script.py')

diff --git a/test/gdb_script.py b/test/gdb_script.py
new file mode 100644
index 0000000..c231a3c
--- /dev/null
+++ b/test/gdb_script.py
@@ -0,0 +1,87 @@
+import sys
+import json
+
+import gdb
+
+
+def extract_bn(bn):
+    data_ptr = bn["dp"]
+    used = int(bn["used"])
+    bs = int(gdb.lookup_global_symbol("bn_digit_bits").value())
+    result = 0
+    for i in range(used):
+        limb = int((data_ptr + i).dereference())
+        result += limb << (i * bs)
+    return result
+
+
+def extract_point(point):
+    result = {}
+    for field in point.type.fields():
+        field_name = field.name
+        if len(field_name) != 1:
+            continue
+        field_value = point[field_name]
+        result[field_name] = extract_bn(field_value)
+    return result
+
+
+class TraceFunction(gdb.Breakpoint):
+    def stop(self):
+        try:
+            set_bp.enabled = True
+            frame = gdb.newest_frame()
+            block = frame.block()
+            print(frame.name(), file=sys.stderr)
+            out = []
+            for sym in block:
+                if sym.is_argument:
+                    name = sym.name
+                    try:
+                        value = frame.read_var(name)
+                    except Exception as e:
+                        value = f"<unavailable: {e}>"
+                    deref = value.dereference()
+                    if deref.type.name == "point_t":
+                        if "out" in name:
+                            out.append(deref)
+                        else:
+                            pt = extract_point(deref)
+                            print(f"{name}: {json.dumps(pt)}", file=sys.stderr)
+            bp = TraceExit(frame)
+            bp.silent = True
+            bp.target = out
+        except RuntimeError as e:
+            pass
+        return False  # Continue execution
+
+
+class TraceExit(gdb.FinishBreakpoint):
+    def stop(self):
+        set_bp.enabled = False
+        for i, point in enumerate(self.target):
+            print(f"out_{i}: {json.dumps(extract_point(point))}", file=sys.stderr)
+        return False  # Continue execution
+
+
+def register_bp(name):
+    if gdb.lookup_global_symbol(name) is not None:
+        bp = TraceFunction(name)
+        bp.silent = True
+        return bp
+    return None
+
+
+register_bp("point_add")
+register_bp("point_dadd")
+register_bp("point_dadd")
+register_bp("point_ladd")
+register_bp("point_dbl")
+register_bp("point_neg")
+register_bp("point_scl")
+register_bp("point_tpl")
+set_bp = register_bp("point_set")
+set_bp.enabled = False
+
+gdb.execute("run")
+# print("\x04", file=sys.stderr)
-- 
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