front end optimization&stack overflow prompt

change parameter type to avoid unnecessary copies of string. change stack depth from 65536<<4 to 16+(65536<<2). now you could know stack overflow when it happens
2026-07-26 21:08:45 +08:00 · 2021-06-07 23:53:43 +08:00
parent a3dbaebfd8
commit 166fe32839
10 changed files with 172 additions and 396 deletions
@@ -1,8 +1,10 @@
 # Nasal Script Language

+## Introduction
+
 [Nasal](http://wiki.flightgear.org/Nasal_scripting_language) is a script language that used in [FlightGear](https://www.flightgear.org/).

-The interpreter is totally rewritten by ValKmjolnir using C++(standard c++11) without reusing the code in Andy Ross's nasal interpreter(https://github.com/andyross/nasal). But we really appreciate that Andy created this amazing programming language and his interpreter project.
+The interpreter is totally rewritten by ValKmjolnir using C++(standard c++11) without reusing the code in Andy Ross's nasal interpreter(<https://github.com/andyross/nasal>). But we really appreciate that Andy created this amazing programming language and his interpreter project.

 The interpreter is still in development(now it works well --2021/2/15). We really need your support!

@@ -10,9 +12,9 @@ Also,i am a member of [FGPRC](https://www.fgprc.org/), welcome to join us!

 (2021/5/4) Now this project uses MIT license.Edit it if you want, use this project to learn or create more interesting things(But don't forget me XD).

-# Why Writing Nasal Interpreter
+## Why Writing Nasal Interpreter

-Nasal is a script language first used in Flightgear, created by Andy Ross(https://github.com/andyross).
+Nasal is a script language first used in Flightgear, created by Andy Ross(<https://github.com/andyross>).

 But in last summer holiday, members in FGPRC told me that it is hard to debug with nasal-console in Flightgear, especially when checking syntax errors.

@@ -26,7 +28,7 @@ Also, you could use this language to write some interesting programs and run the

 You could add your own built-in functions to change this interpreter to a useful tool in your own projects(such as a script in your own game).

-# How to Compile
+## How to Compile

 Better choose the latest update of the interpreter.

@@ -34,7 +36,7 @@ MUST USE -O2 ! pragma gcc optimize(2) seems useless when using g++

 > g++ -std=c++11 -O2 main.cpp -o main.exe

-# Parser
+## Parser

 LL(k) parser.

@@ -47,7 +49,7 @@ These two expressions have the same first set,so LL(1) is useless for this langu

 Maybe in the future i can refactor it to LL(1) with special checks.

-## version 1.0(last update 2019/10/14)
+### version 1.0(last update 2019/10/14)

 First fully functional version of nasal_parser.

@@ -59,17 +61,17 @@ In version 0.17(2019/9/15) 0.18(2019/9/18) 0.19(2019/10/1)i was playing the pars

 This project began at 2019/8/31.

-# Abstract Syntax Tree
+## Abstract Syntax Tree

-## Version 1.2(last update 2019/10/31)
+### Version 1.2(last update 2019/10/31)

 The ast has been completed in this version.

-## Version 2.0(last update 2020/8/31)
+### Version 2.0(last update 2020/8/31)

 A completed ast-interpreter with unfinished lib functions.

-## Version 3.0(last update 2020/10/23)
+### Version 3.0(last update 2020/10/23)

 The ast is refactored and is now easier to read and maintain.

@@ -79,15 +81,15 @@ Now you can add your own functions as builtin-functions in this interpreter!

 I decide to save the ast interpreter after releasing v4.0. Because it took me a long time to think and write...

-## Version 5.0(last update 2021/3/7)
+### Version 5.0(last update 2021/3/7)

 I change my mind.AST interpreter leaves me too much things to do.

 If i continue saving this interpreter,it will be harder for me to make the bytecode vm become more efficient.

-# Byte Code Interpreter
+## Byte Code Interpreter

-## Version 4.0(last update 2020/12/17)
+### Version 4.0(last update 2020/12/17)

 I have just finished the first version of byte-code-interpreter.

@@ -120,7 +122,7 @@ for(var i=0;i<4000000;i+=1);
 0x0000000b: nop    0x00000000
 ```

-## Version 5.0(last update 2021/3/7)
+### Version 5.0(last update 2021/3/7)

 I decide to optimize bytecode vm in this version.

@@ -128,7 +130,7 @@ Because it takes more than 1.5s to count i from 0 to 4000000-1.This is not effic

 2021/1/23 update: Now it can count from 0 to 4000000-1 in 1.5s.

-## Version 6.0(last update 2021/6/1)
+### Version 6.0(last update 2021/6/1)

 Use loadg loadl callg calll mcallg mcalll to avoid branches.

@@ -169,7 +171,7 @@ for(var i=0;i<4000000;i+=1);
 0x0000000c: nop    0x00000000
 ```

-## Version 6.5(latest)
+### Version 6.5(latest)

 2021/5/31 update: Now gc can collect garbage correctly without re-collecting,which will cause fatal error.

@@ -213,9 +215,9 @@ f(1024,2048);
 0x00000011: nop    0x00000000
 ```

-# How to Use Nasal to Program
+## How to Use Nasal to Program

-## basic value type
+### basic value type

 Nasal has 6 value types.Number,string,vector,hash,function,nil.

@@ -281,7 +283,7 @@ var f=func(x,y,z,dynamic_para...)
 }
 ```

-## operators
+### operators

 ```javascript
 1+2;
@@ -311,7 +313,7 @@ a/=1;
 a~='string';
 ```

-## definition
+### definition

 ```javascript
 var a=1;
@@ -321,14 +323,14 @@ var (a,b,c)=(0,1,2);
 (var a,b,c)=(0,1,2);
 ```

-## multi-assignment
+### multi-assignment

 ```javascript
 (a,b[0],c.d)=[0,1,2];
 (a,b[1],c.e)=(0,1,2);
 ```

-## conditional expression
+### conditional expression

 ```javascript
 if(1)
@@ -349,7 +351,7 @@ else
 }
 ```

-## loop
+### loop

 ```javascript
 while(condition)
@@ -365,7 +367,7 @@ foreach(var i;elem)
    print(i);
 ```

-## subvec
+### subvec

 Use index to search one element in the string will get the ascii number of this character.If you want to get the character,use built-in function chr().

@@ -374,7 +376,7 @@ a[-1,1,0:2,0:,:3,:,nil:8,3:nil,nil:nil];
 "hello world"[0];
 ```

-## special function call
+### special function call

 This is of great use but is not very efficient(because hashmap use string as the key to compare).

@@ -382,7 +384,7 @@ This is of great use but is not very efficient(because hashmap use string as the
 a(x:0,y:1,z:2);
 ```

-## lambda
+### lambda

 Also functions have this kind of use:

@@ -391,7 +393,7 @@ func(x,y){return x+y}(0,1);
 func(x){return 1/(1+math.exp(-x));}(0.5);
 ```

-## closure
+### closure

 Use closure to OOP.

@@ -419,7 +421,7 @@ var student=func(name,age)
 }
 ```

-## built-in functions
+### built-in functions

 Must import lib.nas or has these functions' definitions inside your code.

@@ -522,11 +524,3 @@ nasal_val* builtin_getkeys(std::vector<nasal_val*>& local_scope,nasal_gc& gc)
    return ret_addr;
 }
 ```
-
-# 写在最后
-
-我要怎么才能告诉gitee的逆天管理员gitee上的ValKmjolnir和github的ValKmjolnir是一个人？
-
-他居然告诉我，我从github同步的仓库是他人项目？
-
-我证明我是我自己？:sweat_smile: