diff --git a/lib.nas b/lib.nas
index f59ad6b..44c82b0 100644
--- a/lib.nas
+++ b/lib.nas
@@ -260,6 +260,7 @@ var math=
     pi:    3.14159265358979323846264338327950288,
     inf:   1/0,
     nan:   0/0,
+    pow:   func(x,y){return __builtin_pow(x,y);  },
     sin:   func(x)  {return __builtin_sin(x);    },
     cos:   func(x)  {return __builtin_cos(x);    },
     tan:   func(x)  {return __builtin_tan(x);    },
diff --git a/main.cpp b/main.cpp
index e62f2bb..244ba54 100644
--- a/main.cpp
+++ b/main.cpp
@@ -138,7 +138,7 @@ int main(int argc,const char* argv[])
         {"--code",VM_CODEINFO},{"-c",VM_CODEINFO},
         {"--exec",VM_EXEC},{"-e",VM_EXEC},
         {"--opcnt",VM_OPCALLNUM|VM_EXEC},{"-o",VM_OPCALLNUM|VM_EXEC},
-        {"--time",VM_EXECTIME},{"-t",VM_EXECTIME},
+        {"--time",VM_EXECTIME|VM_EXEC},{"-t",VM_EXECTIME|VM_EXEC},
         {"--detail",VM_DBGINFO|VM_EXEC},{"-d",VM_DBGINFO|VM_EXEC},
         {"--optimize",VM_OPTIMIZE},{"-op",VM_OPTIMIZE},
         {"--debug",VM_DEBUG},{"-dbg",VM_DEBUG}
diff --git a/makefile b/makefile
index 3df0450..451d2f2 100644
--- a/makefile
+++ b/makefile
@@ -5,9 +5,9 @@ nasal.exe:main.cpp nasal_ast.h nasal_err.h nasal_builtin.h nasal_opt.h nasal_cod
 	g++ -std=c++11 -O3 main.cpp -o nasal.exe -fno-exceptions -Wshadow -Wall -static
 test:nasal
 	@ ./nasal -op -e test/ascii-art.nas
-	@ ./nasal -op -c test/bf.nas
-	@ ./nasal -op -c test/bfcolored.nas
-	@ ./nasal -op -c test/bfconvertor.nas
+	@ ./nasal -op -a -c test/bf.nas
+	@ ./nasal -op -a -c test/bfcolored.nas
+	@ ./nasal -op -a -c test/bfconvertor.nas
 	@ ./nasal -op -e -d test/bfs.nas
 	@ ./nasal -op -t test/bigloop.nas
 	@ ./nasal -op -e test/bp.nas
@@ -33,9 +33,9 @@ test:nasal
 	@ ./nasal -op -e test/qrcode.nas
 	@ ./nasal -op -t -d test/quick_sort.nas
 	@ ./nasal -op -e test/scalar.nas
-	-@ ./nasal -op -t test/snake.nas
-	@ ./nasal -op -e test/trait.nas
-	-@ ./nasal -op -t test/tetris.nas
-	@ ./nasal -op -t -d test/turingmachine.nas
-	@ ./nasal -op -t -d -o test/ycombinator.nas
+	-@ ./nasal -op -c -t test/snake.nas
+	@ ./nasal -op -c -e test/trait.nas
+	-@ ./nasal -op -c -t test/tetris.nas
+	@ ./nasal -op -c -t -d test/turingmachine.nas
+	@ ./nasal -op -c -t -d -o test/ycombinator.nas
 	
\ No newline at end of file
diff --git a/nasal_builtin.h b/nasal_builtin.h
index 3aba324..24fd4c9 100644
--- a/nasal_builtin.h
+++ b/nasal_builtin.h
@@ -29,6 +29,7 @@ nas_native(builtin_and);
 nas_native(builtin_or);
 nas_native(builtin_nand);
 nas_native(builtin_not);
+nas_native(builtin_pow);
 nas_native(builtin_sin);
 nas_native(builtin_cos);
 nas_native(builtin_tan);
@@ -116,6 +117,7 @@ struct
     {"__builtin_or",      builtin_or      },
     {"__builtin_nand",    builtin_nand    },
     {"__builtin_not",     builtin_not     },
+    {"__builtin_pow",     builtin_pow     },
     {"__builtin_sin",     builtin_sin     },
     {"__builtin_cos",     builtin_cos     },
     {"__builtin_tan",     builtin_tan     },
@@ -468,6 +470,14 @@ nasal_ref builtin_not(nasal_ref* local,nasal_gc& gc)
     int number=(int)a.num();
     return {vm_num,(double)(~number)};
 }
+nasal_ref builtin_pow(nasal_ref* local,nasal_gc& gc)
+{
+    nasal_ref x=local[1];
+    nasal_ref y=local[2];
+    if(x.type!=vm_num || y.type!=vm_num)
+        return builtin_err("pow","\"x\" or \"y\" must be number");
+    return {vm_num,std::pow(x.num(),y.num())};
+}
 nasal_ref builtin_sin(nasal_ref* local,nasal_gc& gc)
 {
     nasal_ref val=local[1];
diff --git a/nasal_codegen.h b/nasal_codegen.h
index 3a9257b..6a5b8a7 100644
--- a/nasal_codegen.h
+++ b/nasal_codegen.h
@@ -1165,10 +1165,10 @@ void nasal_codegen::print_op(uint32_t index)
     printf("  0x%.8x:       %.2x %.2x %.2x %.2x %.2x        %s  ",
         index,
         c.op,
-        uint8_t((c.num&0xff000000)>>24),
-        uint8_t((c.num&0x00ff0000)>>16),
-        uint8_t((c.num&0x0000ff00)>>8),
-        uint8_t(c.num&0x000000ff),
+        uint8_t((c.num>>24)&0xff),
+        uint8_t((c.num>>16)&0xff),
+        uint8_t((c.num>>8)&0xff),
+        uint8_t(c.num&0xff),
         code_table[c.op].name
     );
     // print detail info
diff --git a/nasal_gc.h b/nasal_gc.h
index 980b9b2..9181ab0 100644
--- a/nasal_gc.h
+++ b/nasal_gc.h
@@ -505,10 +505,10 @@ void nasal_gc::info()
     };
     std::cout<<"\ngarbage collector info:\n";
     for(uint8_t i=vm_str;i<vm_type_size;++i)
-        std::cout<<name[i]<<" | "<<count[i]<<"\n";
+        std::cout<<"  "<<name[i]<<" | "<<count[i]<<"\n";
     std::cout<<"\nmemory allocator info(max size):\n";
     for(uint8_t i=vm_str;i<vm_type_size;++i)
-        std::cout<<name[i]<<" | "<<(size[i]+1)*increment[i]<<"(+"<<size[i]<<")\n";
+        std::cout<<"  "<<name[i]<<" | "<<(size[i]+1)*increment[i]<<"(+"<<size[i]<<")\n";
 }
 nasal_ref nasal_gc::alloc(uint8_t type)
 {
diff --git a/nasal_vm.h b/nasal_vm.h
index 1251036..3b9b28e 100644
--- a/nasal_vm.h
+++ b/nasal_vm.h
@@ -296,15 +296,16 @@ void nasal_vm::opcallsort(const uint64_t* arr)
         opcall.end(),
         [](op& a,op& b){return a.second>b.second;}
     );
+    std::cout<<"\noperands call info:";
     uint64_t total=0;
     for(auto& i:opcall)
     {
         if(!i.second)
             break;
         total+=i.second;
-        std::cout<<'\n'<<code_table[i.first].name<<": "<<i.second;
+        std::cout<<"\n  "<<code_table[i.first].name<<" : "<<i.second;
     }
-    std::cout<<"\ntotal : "<<total<<'\n';
+    std::cout<<"\n  total  : "<<total<<'\n';
 }
 void nasal_vm::die(std::string str)
 {
diff --git a/stl/lib.nas b/stl/lib.nas
index f59ad6b..44c82b0 100644
--- a/stl/lib.nas
+++ b/stl/lib.nas
@@ -260,6 +260,7 @@ var math=
     pi:    3.14159265358979323846264338327950288,
     inf:   1/0,
     nan:   0/0,
+    pow:   func(x,y){return __builtin_pow(x,y);  },
     sin:   func(x)  {return __builtin_sin(x);    },
     cos:   func(x)  {return __builtin_cos(x);    },
     tan:   func(x)  {return __builtin_tan(x);    },
diff --git a/test/lexer.nas b/test/lexer.nas
index 38b6245..aeb8980 100644
--- a/test/lexer.nas
+++ b/test/lexer.nas
@@ -5,12 +5,22 @@ var lexer=func(file)
     var (ptr,token)=(0,[]);
     var s=io.fin(file);
     var len=size(s);
+    var line=0;
+    var gen=func(tok)
+    {
+        append(token,{
+            line:line,
+            token:tok
+        });
+    }
     return
     {
         jmp_note:func()
         {
-            while(ptr<len and chr(s[ptr])!='\n')
+            while(ptr<len and s[ptr]!='\n'[0])
                 ptr+=1;
+            if(ptr<len and s[ptr]=='\n'[0])
+                line+=1;
             ptr+=1;
         },
         id_gen:func()
@@ -28,7 +38,7 @@ var lexer=func(file)
                     break;
                 ptr+=1;
             }
-            append(token,tmp);
+            gen(tmp);
         },
         str_gen:func()
         {
@@ -57,13 +67,17 @@ var lexer=func(file)
                     else           str~=c;
                 }
                 else
+                {
+                    if(s[ptr]=='\n'[0])
+                        line+=1;
                     str~=chr(s[ptr]);
+                }
                 ptr+=1;
             }
             if(ptr>=len)
                 print("read eof when generating string.\n");
             ptr+=1;
-            append(token,str);
+            gen(str);
         },
         num_gen:func()
         {
@@ -79,7 +93,7 @@ var lexer=func(file)
                     number~=chr(s[ptr]);
                     ptr+=1;
                 }
-                append(token,num(number));
+                gen(num(number));
                 return;
             }
             elsif(ptr<len and chr(s[ptr])=='o')
@@ -90,7 +104,7 @@ var lexer=func(file)
                     number~=chr(s[ptr]);
                     ptr+=1;
                 }
-                append(token,num(number));
+                gen(num(number));
                 return;
             }
             while(ptr<len and ('0'[0]<=s[ptr] and s[ptr]<='9'[0]))
@@ -126,7 +140,7 @@ var lexer=func(file)
             var last_c=chr(number[-1]);
             if(last_c=='.' or last_c=='e' or last_c=='E' or last_c=='-' or last_c=='+')
                 println("error number: ",number);
-            append(token,num(number));
+            gen(num(number));
         },
         opr_gen:func()
         {
@@ -140,35 +154,41 @@ var lexer=func(file)
                     tmp~=chr(s[ptr]);
                     ptr+=1;
                 }
-                append(token,tmp);
+                gen(tmp);
                 return;
             }
             elsif(c=='.')
             {
                 if(ptr+2<len and chr(s[ptr+1])=='.' and chr(s[ptr+2])=='.')
                 {
-                    append(token,"...");
+                    gen("...");
                     ptr+=3;
                 }
                 else
                 {
-                    append(token,".");
+                    gen(".");
                     ptr+=1;
                 }
                 return;
             }
             elsif(c!=' ' and c!='\t' and c!='\n' and c!='\r' and s[ptr]>0)
-                append(token,c);
+                gen(c);
             ptr+=1;
             return;
         },
         compile:func()
         {
+            line=1;
             while(ptr<len)
             {
                 var c=s[ptr];
                 if(c=='#'[0])
                     me.jmp_note();
+                elsif(c=='\n'[0])
+                {
+                    line+=1;
+                    ptr+=1;
+                }
                 elsif('a'[0]<=c and c<='z'[0]
                     or 'A'[0]<=c and c<='Z'[0]
                     or c=='_'[0])
@@ -189,5 +209,4 @@ var lexer=func(file)
 var lex=lexer("test/props.nas");
 lex.compile();
 foreach(var tok;lex.get_token())
-    print(tok,' ');
-print('\n');
\ No newline at end of file
+    print('(',tok.line,' | ',tok.token,')\n');
\ No newline at end of file