Making GLSL AST nodes while preserving lineno info

Eventually we will need some way to locate an identifier's
definition, so add "lineno" to each AST node.  May want to
change this to "position" later.  The makeAstNode<T>() function
takes care of automatically decorating nodes with line numbers.

src/libs/glsl/glslparser.h

@@ -33,6 +33,7 @@
 #include "glslparsertable_p.h"
 #include "glsllexer.h"
 #include "glslast.h"
+#include "glslengine.h"
 #include <vector>
 #include <stack>
 
@@ -70,10 +71,51 @@ private:
     inline int tokenKind(int index) const { return _tokens.at(index).kind; }
     void reduce(int ruleno);
 
+    template <typename T>
+    T *makeAstNode()
+    {
+        T *node = new (_engine->pool()) T ();
+        node->lineno = yyloc >= 0 ? (_tokens[yyloc].line + 1) : 0;
+        return node;
+    }
+
+    template <typename T, typename A1>
+    T *makeAstNode(A1 a1)
+    {
+        T *node = new (_engine->pool()) T (a1);
+        node->lineno = yyloc >= 0 ? (_tokens[yyloc].line + 1) : 0;
+        return node;
+    }
+
+    template <typename T, typename A1, typename A2>
+    T *makeAstNode(A1 a1, A2 a2)
+    {
+        T *node = new (_engine->pool()) T (a1, a2);
+        node->lineno = yyloc >= 0 ? (_tokens[yyloc].line + 1) : 0;
+        return node;
+    }
+
+    template <typename T, typename A1, typename A2, typename A3>
+    T *makeAstNode(A1 a1, A2 a2, A3 a3)
+    {
+        T *node = new (_engine->pool()) T (a1, a2, a3);
+        node->lineno = yyloc >= 0 ? (_tokens[yyloc].line + 1) : 0;
+        return node;
+    }
+
+    template <typename T, typename A1, typename A2, typename A3, typename A4>
+    T *makeAstNode(A1 a1, A2 a2, A3 a3, A4 a4)
+    {
+        T *node = new (_engine->pool()) T (a1, a2, a3, a4);
+        node->lineno = yyloc >= 0 ? (_tokens[yyloc].line + 1) : 0;
+        return node;
+    }
+
 private:
     Engine *_engine;
     int _tos;
     int _index;
+    int yyloc;
     std::vector<int> _stateStack;
     std::vector<int> _locationStack;
     std::vector<Value> _symStack;