feat(lexer, preprocessor): replace cstring conversion with copy and refactor macro expansion

- Replace `scc_cstring_from_cstr(scc_cstring_as_cstr(...))` with `scc_cstring_copy()` in lexer to fix memory leaks
- Extract macro expansion logic into separate `expand_macro.c` file
- Remove `expand_stack` parameter from `scc_pp_expand_macro()` function
- Add new parsing functions for macro replacement lists and arguments
- Add string utility functions for whitespace trimming and string joining
- Update memory stream documentation for clarity

runtime/libutils/include/hashtable.h

@@ -1,12 +1,12 @@
 /**
- * @file hashmap.h
+ * @file hashtable.h
  * @brief 开放寻址法哈希表实现
  *
  * 提供基于向量容器的哈希表实现，支持动态扩容和墓碑机制
  */
 
-#ifndef __SCC_HASHMAP_H__
-#define __SCC_HASHMAP_H__
+#ifndef __SCC_HASHTABLE_H__
+#define __SCC_HASHTABLE_H__
 
 #include <libcore.h>
 
@@ -121,4 +121,4 @@ typedef int (*scc_hashtable_iter_fn)(const void *key, void *value,
 void scc_hashtable_foreach(scc_hashtable_t *ht, scc_hashtable_iter_fn iter_func,
                            void *context);
 
-#endif /* __SCC_HASHMAP_H__ */
+#endif /* __SCC_HASHTABLE_H__ */

runtime/libutils/include/libutils.h

@@ -1,9 +1,9 @@
 #ifndef __SMCC_UTILS_H__
 #define __SMCC_UTILS_H__
 
-#include "hashmap.h"
+#include "hashtable.h"
 #include "kllist.h"
 #include "strpool.h"
 #include <libcore.h>
 
-#endif // __SMCC_UTILS_H__
+#endif /* __SMCC_UTILS_H__ */

runtime/libutils/include/strpool.h

@@ -8,7 +8,7 @@
 #ifndef __SCC_STRPOOL_H__
 #define __SCC_STRPOOL_H__
 
-#include "hashmap.h"
+#include "hashtable.h"
 #include <libcore.h>
 
 /**

runtime/libutils/src/hashtable.c

@@ -1,4 +1,4 @@
-#include <hashmap.h>
+#include <hashtable.h>
 
 #ifndef SCC_INIT_HASHMAP_SIZE
 #define SCC_INIT_HASHMAP_SIZE (32)

runtime/libutils/src/vector-gdb.py

@@ -1,112 +0,0 @@
-# vector_gdb.py
-import gdb # type: ignore
-from gdb.printing import PrettyPrinter # type: ignore
-
-class VectorPrinter:
-    """兼容新旧注册方式的最终方案"""
-    
-    def __init__(self, val: gdb.Value):
-        self.val:gdb.Value = val
-        
-    def check_type(self) -> bool:
-        """类型检查（兼容匿名结构体）"""
-        try:
-            if self.val.type.code != gdb.TYPE_CODE_STRUCT:
-                return False
-            fields = self.val.type.fields()
-            if not fields:
-                return False
-            exp = ['size', 'cap', 'data']
-            for t in fields:
-                if t.name in exp:
-                    exp.remove(t.name)
-                else:
-                    return False
-            return True
-        except gdb.error:
-            return False
-    
-    def to_string(self):
-        if not self.check_type():
-            return "Not a vector"
-            
-        return "vector({} size={}, cap={})".format(
-            self.val.address,
-            self.val['size'],
-            self.val['cap'],
-        )
-    
-    def display_hint(self):
-        return 'array'
-    
-    def children(self):
-        """生成数组元素（关键改进点）"""
-        if not self.check_type():
-            return []
-            
-        size = int(self.val['size'])
-        cap = int(self.val['cap'])
-        data_ptr = self.val['data']
-        
-        if cap == 0 or data_ptr == 0:
-            return []
-        
-        # 使用 GDB 内置数组转换
-        array = data_ptr.dereference()
-        array = array.cast(data_ptr.type.target().array(cap - 1))
-        
-        for i in range(size):
-            # state = "<used>" if i < size else "<unused>"
-            try:
-                value = array[i]
-                yield (f"[{i}] {value.type} {value.address}", value)
-            except gdb.MemoryError:
-                yield (f"[{i}]", "<invalid>")
-
-# 注册方式一：传统append方法（您之前有效的方式）self
-def append_printer():
-    gdb.pretty_printers.append(
-        lambda val: VectorPrinter(val) if VectorPrinter(val).check_type() else None
-    )
-
-# 注册方式二：新版注册方法（备用方案）  
-def register_new_printer():
-    class VectorPrinterLocator(PrettyPrinter):
-        def __init__(self):
-            super().__init__("vector_printer")
-            
-        def __call__(self, val):
-            ret = VectorPrinter(val).check_type()
-            print(f"ret {ret}, type {val.type}, {[(i.name, i.type) for i in  val.type.fields()]}")
-            return None
-    
-    gdb.printing.register_pretty_printer(
-        gdb.current_objfile(),
-        VectorPrinterLocator()
-    )
-
-# 双重注册保证兼容性
-append_printer()  # 保留您原来有效的方式
-# register_new_printer()  # 添加新版注册
-
-class VectorInfoCommand(gdb.Command):
-    """保持原有命令不变"""
-    def __init__(self):
-        super().__init__("vector_info", gdb.COMMAND_USER)
-        
-    def invoke(self, argument, from_tty):
-        val = gdb.parse_and_eval(argument)
-        printer = VectorPrinter(val)
-        
-        if not printer.check_type():
-            print("Invalid vector")
-            return
-            
-        print("=== Vector Details ===")
-        print("Size:", val['size'])
-        print("Capacity:", val['cap'])
-        print("Elements:")
-        for name, value in printer.children():
-            print(f"  {name}: {value}")
-
-VectorInfoCommand()