C interpriter

cpp-voxel-engine/imgui.ini

@@ -5,6 +5,6 @@ Collapsed=0
 
 [Window][Debug]
 Pos=12,41
-Size=336,392
+Size=778,630
 Collapsed=0
 

python-c-interpriter/main.c

@@ -0,0 +1,14 @@
+#include "other.h"
+
+void main() {
+    int a = 5;
+    printf("%d", a);
+    foo();
+    int i = 10;
+    while (i != 0)
+    {
+        printf("%d", i);
+        i -= 1;
+
+    }
+}

python-c-interpriter/main.py

@@ -0,0 +1,159 @@
+import sys
+import os
+import re
+
+# ──────── Interpreter State ────────
+
+class Frame:
+    def __init__(self, function_name, locals=None):
+        self.function_name = function_name
+        self.locals = locals or {}
+
+class InterpreterState:
+    def __init__(self):
+        self.stack = []  # Call stack
+        self.functions = {}  # name → AST
+
+    def push_frame(self, name):
+        self.stack.append(Frame(name))
+
+    def pop_frame(self):
+        return self.stack.pop()
+
+    def current_frame(self):
+        return self.stack[-1] if self.stack else None
+
+    def debug_bt(self):
+        print("\nBacktrace:")
+        for i, frame in enumerate(reversed(self.stack)):
+            print(f"  #{i} {frame.function_name}")
+        print()
+
+    def debug_vars(self):
+        frame = self.current_frame()
+        print("\nVariables:")
+        if frame:
+            for k, v in frame.locals.items():
+                print(f"  {k} = {v}")
+        else:
+            print("  No active frame.")
+        print()
+
+# ──────── C Parser (toy) ────────
+
+def parse_c_file(filename, included=None):
+    if included is None:
+        included = set()
+
+    abs_path = os.path.abspath(filename)
+    if abs_path in included:
+        return {}
+
+    included.add(abs_path)
+
+    try:
+        with open(abs_path) as f:
+            lines = f.readlines()
+    except FileNotFoundError:
+        print(f"Error: File '{filename}' not found.")
+        return {}
+
+    ast = {}
+    current_fn = None
+    body = []
+
+    for line in lines:
+        line = line.strip()
+        if line.startswith("#include"):
+            match = re.match(r'#include\s+"(.+?)"', line)
+            if match:
+                included_ast = parse_c_file(os.path.join(os.path.dirname(abs_path), match.group(1)), included)
+                ast.update(included_ast)
+        elif line.startswith("void"):
+            fn_match = re.match(r'void\s+(\w+)\s*\(\s*\)\s*{', line)
+            if fn_match:
+                if current_fn:
+                    ast[current_fn] = body
+                    body = []
+                current_fn = fn_match.group(1)
+        elif line == "}":
+            if current_fn:
+                ast[current_fn] = body
+                current_fn = None
+                body = []
+        elif re.match(r'int\s+\w+\s*=\s*\d+;', line):
+            var_match = re.match(r'int\s+(\w+)\s*=\s*(\d+);', line)
+            body.append(('decl', var_match.group(1), int(var_match.group(2))))
+        elif re.match(r'printf\(".*",\s*\w+\);', line):
+            print_match = re.match(r'printf\(".*",\s*(\w+)\);', line)
+            body.append(('print', print_match.group(1)))
+        elif re.match(r'\w+\(\);', line):
+            call_match = re.match(r'(\w+)\(\);', line)
+            body.append(('call', call_match.group(1)))
+    return ast
+
+# ──────── Interpreter Executor ────────
+
+class Interpreter:
+    def __init__(self, state):
+        self.state = state
+
+    def run_function(self, name):
+        if name not in self.state.functions:
+            print(f"Function '{name}' not defined.")
+            return
+        self.state.push_frame(name)
+        body = self.state.functions[name]
+        for stmt in body:
+            self.exec_stmt(stmt)
+        self.state.pop_frame()
+
+    def exec_stmt(self, stmt):
+        frame = self.state.current_frame()
+        if stmt[0] == 'decl':
+            _, var, val = stmt
+            frame.locals[var] = val
+        elif stmt[0] == 'print':
+            var = stmt[1]
+            print(frame.locals.get(var, 'undefined'))
+        elif stmt[0] == 'call':
+            self.run_function(stmt[1])
+
+# ──────── Debugger CLI ────────
+
+def debugger_loop(state, interp):
+    print("Mini C Interpreter Debugger")
+    print("Commands: run, bt, vars, quit")
+    while True:
+        cmd = input("(debug) ").strip()
+        if cmd == "run":
+            interp.run_function("main")
+        elif cmd == "bt":
+            state.debug_bt()
+        elif cmd == "vars":
+            state.debug_vars()
+        elif cmd == "quit":
+            break
+        else:
+            print("Unknown command. Use: run, bt, vars, quit")
+
+# ──────── Entry Point ────────
+
+def main():
+    if len(sys.argv) < 2:
+        print("Usage: python c_interpreter.py <file.c>")
+        return
+
+    filename = sys.argv[1]
+    ast = parse_c_file(filename)
+    if not ast:
+        print("No functions parsed.")
+        return
+
+    state = InterpreterState()
+    state.functions = ast
+    interp = Interpreter(state)
+    debugger_loop(state, interp)
+
+if __name__ == "__main__":
+    main()

python-c-interpriter/other.h

@@ -0,0 +1,4 @@
+void foo() {
+    int x = 10;
+    printf("%d", x);
+}