add constant string calculation in optimizer

main.cpp

@@ -28,10 +28,12 @@ void help()
     <<"    -l,   --lex     | view token info.\n"
     <<"    -a,   --ast     | view abstract syntax tree.\n"
     <<"    -c,   --code    | view bytecode.\n"
+    <<"    -e,   --exec    | execute.\n"
     <<"    -t,   --time    | execute and get the running time.\n"
     <<"    -o,   --opcnt   | execute and count used operands.\n"
     <<"    -d,   --detail  | execute and get detail crash info.\n"
     <<"    -op,  --optimize| use optimizer(beta).\n"
+    <<"                    | if want to use -op and run, please use -op -e/-t/-o/-d.\n"
     <<"    -dbg, --debug   | debug mode (this will ignore -t -o -d).\n"
     <<"file:\n"
     <<"    input file name to execute script file.\n";
@@ -139,6 +141,8 @@ int main(int argc,const char* argv[])
             cmd|=VM_ASTINFO;
         else if(s=="--code" || s=="-c")
             cmd|=VM_CODEINFO;
+        else if(s=="--exec" || s=="-e")
+            cmd|=VM_EXEC;
         else if(s=="--opcnt" || s=="-o")
             cmd|=VM_OPCALLNUM|VM_EXEC;
         else if(s=="--time" || s=="-t")

makefile

@@ -2,33 +2,33 @@
 nasal:main.cpp nasal_ast.h nasal_err.h nasal_builtin.h nasal_opt.h nasal_codegen.h nasal_gc.h nasal_import.h nasal_lexer.h nasal_parse.h nasal_vm.h nasal_dbg.h nasal.h
 	clang++ -std=c++11 -O3 main.cpp -o nasal -fno-exceptions -ldl -Wshadow -Wall
 test:nasal
-	./nasal test/ascii-art.nas
-	./nasal -c test/bf.nas
-	./nasal -c test/bfconvertor.nas
-	./nasal test/bfs.nas
-	./nasal -t test/bigloop.nas
-	./nasal test/bp.nas
-	./nasal test/calc.nas
-	./nasal test/choice.nas
-	./nasal test/class.nas
-	./nasal -c test/exception.nas
-	./nasal -t test/fib.nas
-	./nasal test/filesystem.nas
-	./nasal test/hexdump.nas
-	./nasal test/json.nas
-	./nasal test/leetcode1319.nas
-	./nasal test/lexer.nas
-	./nasal test/life.nas
-	./nasal -t test/loop.nas
-	./nasal -c test/mandel.nas
-	./nasal -t test/mandelbrot.nas
-	./nasal -c test/module_test.nas
-	./nasal test/nasal_test.nas
-	./nasal -t test/pi.nas
-	./nasal -t test/prime.nas
-	./nasal -t test/quick_sort.nas
-	./nasal test/scalar.nas
-	./nasal test/trait.nas
-	./nasal -t test/turingmachine.nas
-	./nasal -t test/ycombinator.nas
+	./nasal -op -e test/ascii-art.nas
+	./nasal -op -c test/bf.nas
+	./nasal -op -c test/bfconvertor.nas
+	./nasal -op -e test/bfs.nas
+	./nasal -op -t test/bigloop.nas
+	./nasal -op -e test/bp.nas
+	./nasal -op -e test/calc.nas
+	./nasal -op -e test/choice.nas
+	./nasal -op -e test/class.nas
+	./nasal -op -c test/exception.nas
+	./nasal -op -t test/fib.nas
+	./nasal -op -e test/filesystem.nas
+	./nasal -op -e test/hexdump.nas
+	./nasal -op -e test/json.nas
+	./nasal -op -e test/leetcode1319.nas
+	./nasal -op -e test/lexer.nas
+	./nasal -op -e test/life.nas
+	./nasal -op -t test/loop.nas
+	./nasal -op -c test/mandel.nas
+	./nasal -op -t test/mandelbrot.nas
+	./nasal -op -c test/module_test.nas
+	./nasal -op -e test/nasal_test.nas
+	./nasal -op -t test/pi.nas
+	./nasal -op -t test/prime.nas
+	./nasal -op -t test/quick_sort.nas
+	./nasal -op -e test/scalar.nas
+	./nasal -op -e test/trait.nas
+	./nasal -op -t test/turingmachine.nas
+	./nasal -op -t test/ycombinator.nas
 	

nasal_ast.h

@@ -3,7 +3,7 @@
 
 enum ast_node
 {
-    ast_null=0,
+    ast_null=0,      // null node
     ast_root,        // mark the root node of ast
     ast_block,       // expression block 
     ast_file,        // used to store which file the sub-tree is on, only used in main block

nasal_opt.h

@@ -1,22 +1,17 @@
 #ifndef __NASAL_OPT_H__
 #define __NASAL_OPT_H__
 
-void calc_const_num(nasal_ast& root)
+void const_str(nasal_ast& root)
+{
+    auto& vec=root.child();
+    root.set_str(vec[0].str()+vec[1].str());
+    root.child().clear();
+    root.set_type(ast_str);
+}
+
+void const_num(nasal_ast& root)
 {
     auto& vec=root.child();
-    for(auto& i:vec)
-        calc_const_num(i);
-    if(root.type()!=ast_add &&
-        root.type()!=ast_sub &&
-        root.type()!=ast_mult &&
-        root.type()!=ast_div &&
-        root.type()!=ast_less &&
-        root.type()!=ast_leq &&
-        root.type()!=ast_grt &&
-        root.type()!=ast_geq)
-        return;
-    if(vec.size()!=2 || vec[0].type()!=ast_num || vec[1].type()!=ast_num)
-        return;
     double res;
     switch(root.type())
     {
@@ -29,15 +24,39 @@ void calc_const_num(nasal_ast& root)
         case ast_grt: res=vec[0].num()>vec[1].num(); break;
         case ast_geq: res=vec[0].num()>=vec[1].num();break;
     }
-    if(std::isinf(res) || std::isnan(res)) // inf and nan will cause number hashmap error in codegen
+    // inf and nan will cause number hashmap error in codegen
+    if(std::isinf(res) || std::isnan(res))
         return;
     root.set_num(res);
     root.child().clear();
     root.set_type(ast_num);
 }
+
+void calc_const(nasal_ast& root)
+{
+    auto& vec=root.child();
+    for(auto& i:vec)
+        calc_const(i);
+    if(vec.size()!=2)
+        return;
+    if(root.type()!=ast_add &&
+        root.type()!=ast_sub &&
+        root.type()!=ast_mult &&
+        root.type()!=ast_div &&
+        root.type()!=ast_link &&
+        root.type()!=ast_less &&
+        root.type()!=ast_leq &&
+        root.type()!=ast_grt &&
+        root.type()!=ast_geq)
+        return;
+    if(root.type()==ast_link && vec[0].type()==ast_str && vec[1].type()==ast_str)
+        const_str(root);
+    else if(root.type()!=ast_link && vec[0].type()==ast_num && vec[1].type()==ast_num)
+        const_num(root);
+}
 void optimize(nasal_ast& root)
 {
     for(auto& i:root.child())
-        calc_const_num(i);
+        calc_const(i);
 }
 #endif

nasal_parse.h

@@ -99,8 +99,8 @@ private:
     nasal_ast ret_expr();
 public:
     nasal_parse(nasal_err& e):nerr(e){}
-    void       print(){root.print(0);}
-    void       compile(const nasal_lexer&);
+    void print(){root.print(0);}
+    void compile(const nasal_lexer&);
     nasal_ast& ast(){return root;}
     const nasal_ast& ast() const {return root;}
 };