From 63cb4fbbb961da133c68865845eaf22d9b876700 Mon Sep 17 00:00:00 2001
From: chai <chaifix@163.com>
Date: Sun, 27 Sep 2020 20:31:53 +0800
Subject: *misc

---
 src/lua51/lobject.h | 78 ++++++++++++++++++++++++++++++++---------------------
 1 file changed, 47 insertions(+), 31 deletions(-)

(limited to 'src/lua51/lobject.h')

diff --git a/src/lua51/lobject.h b/src/lua51/lobject.h
index ead9391..5d6df6c 100644
--- a/src/lua51/lobject.h
+++ b/src/lua51/lobject.h
@@ -43,7 +43,7 @@ typedef union GCObject GCObject;
 // 需要垃圾回收的类型包含这个头，包含TString, Udata, Proto, UpVal, Closure, Table以及lua_State七个
 //c next   指向下一个gc链表的成员
 //c tt     数据类型
-//c marked GC标记，用来保存颜色,有白色（2种）,灰色和黑色
+//c marked GC标记，用一个字节进行标记，在lgc.h
 #define CommonHeader	GCObject *next; lu_byte tt; lu_byte marked
 
 
@@ -242,16 +242,16 @@ typedef struct Proto {
   CommonHeader;
 	//c 常量表，能看出来lua保存常量的单元是函数原型，所有代码片段都会被编译为proto
   TValue *k;  /* constants used by the function */
-	//c 函数字节码起始点
+	//c 这个函数的字节码
   Instruction *code;
-	//c 内部函数
+	//c 这个函数内嵌套的函数
   struct Proto **p;  /* functions defined inside the function */
   int *lineinfo;  /* map from opcodes to source lines */
-	//c 局部变量
+	//c 局部变量，在lparser.c > registerlocalvar注册
   struct LocVar *locvars;  /* information about local variables */
-	//c upvalues
+	//c upvalue表
   TString **upvalues;  /* upvalue names */
-  TString  *source; //文件名
+  TString  *source; //c 文件名，只有顶层函数有，内嵌函数这个字段是空的
   int sizeupvalues;
   int sizek;  /* size of `k' */
   int sizecode;
@@ -276,7 +276,9 @@ typedef struct Proto {
 
 //c 局部变量
 typedef struct LocVar {
-  TString *varname;
+	//c 变量名，只会在编译器用到，存在FuncState结构，用来查找局部变量ID
+  TString *varname; 
+	//c 
   int startpc;  /* first point where variable is active */
   int endpc;    /* first point where variable is dead */
 } LocVar;
@@ -287,19 +289,30 @@ typedef struct LocVar {
 ** Upvalues
 */
 //c 判断upvalue是关闭的方式是 uv->v == &uv->u.value
-//c upvalue有开闭的概念
-//c 开是指upvalue完全由此方法所有，之前的调用已经结束
-//c 关闭是指upvalue还在之前的栈上
+// upvalue有开闭的概念
+// 开是指upvalue完全由此方法所有，之前的调用已经结束
+// 关闭是指upvalue还在之前的栈上
+typedef struct UpVal {
+  CommonHeader;
+  TValue *v;  /* points to stack or to its own value */ //c upvalue的栈地址
+  union {
+    TValue value;  /* the value (when closed) */
+    struct {  /* double linked list (when open) */
+      struct UpVal *prev;
+      struct UpVal *next;
+    } l;
+  } u;
+} UpVal;
 /*
-* function func() 
-* 	local a = 10; 
-* 	local b = function() 
-* 		a = a + 1 
-* 		print(a) 
-* 	end 
+* function func()
+* 	local a = 10;
+* 	local b = function()
+* 		a = a + 1
+* 		print(a)
+* 	end
 * 	b() -- 这个是开
-* end 
-* 
+* end
+*
 * function func()
 * 	local a = 10;
 * 	local b = function()
@@ -307,22 +320,11 @@ typedef struct LocVar {
 * 		print(a)
 * 	end
 * 	return b
-* end 
-* 
+* end
+*
 * fn = func()
 * fn() -- 这个是关
 */
-typedef struct UpVal {
-  CommonHeader;
-  TValue *v;  /* points to stack or to its own value */ //c upvalue的栈地址
-  union {
-    TValue value;  /* the value (when closed) */
-    struct {  /* double linked list (when open) */
-      struct UpVal *prev;
-      struct UpVal *next;
-    } l;
-  } u;
-} UpVal;
 
 
 /*
@@ -335,6 +337,13 @@ typedef struct UpVal {
 
 typedef struct CClosure {
   ClosureHeader;
+	/*
+	CommonHeader;  //c gc header
+	lu_byte isC;   //c is c closure
+	lu_byte nupvalues;  //c number of upvalues
+	GCObject *gclist; //c gclist?
+	struct Table *env //c 这个闭包的环境
+	*/
   lua_CFunction f;
   TValue upvalue[1];
 } CClosure;
@@ -342,6 +351,13 @@ typedef struct CClosure {
 
 typedef struct LClosure {
   ClosureHeader;
+	/*
+	CommonHeader;  //c gc header
+	lu_byte isC;   //c is c closure
+	lu_byte nupvalues;  //c number of upvalues
+ 	GCObject *gclist; //c gclist?
+	struct Table *env //c 这个闭包的环境，在luaF_newLclosure设置
+	*/
   struct Proto *p; // lua闭包的函数原型
   UpVal *upvals[1]; // lua闭包的upvalue
 } LClosure;
-- 
cgit v1.1-26-g67d0