From ddeb187697cfab9802f10cc09b9901a50afe88e9 Mon Sep 17 00:00:00 2001
From: "Jay Freeman (saurik)" <saurik@saurik.com>
Date: Wed, 25 Nov 2015 16:03:14 -0800
Subject: [PATCH] Bison's stack was using up *half* my parsing time.

---
 Cycript.yy.in |   1 +
 Stack.hpp     | 138 ++++++++++++++++++++++++++++++++++++++++++++++++++
 2 files changed, 139 insertions(+)
 create mode 100644 Stack.hpp

diff --git a/Cycript.yy.in b/Cycript.yy.in
index d5d7c98..d797aed 100644
--- a/Cycript.yy.in
+++ b/Cycript.yy.in
@@ -27,6 +27,7 @@
 %code requires {
 #include "Driver.hpp"
 #include "Parser.hpp"
+#include "Stack.hpp"
 #define CYNew new($pool)
 
 @begin ObjectiveC
diff --git a/Stack.hpp b/Stack.hpp
new file mode 100644
index 0000000..4a3fc6e
--- /dev/null
+++ b/Stack.hpp
@@ -0,0 +1,138 @@
+/* Cycript - Optimizing JavaScript Compiler/Runtime
+ * Copyright (C) 2009-2015  Jay Freeman (saurik)
+*/
+
+/* GNU Affero General Public License, Version 3 {{{ */
+/*
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU Affero General Public License as published by
+ * the Free Software Foundation, either version 3 of the License, or
+ * (at your option) any later version.
+
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU Affero General Public License for more details.
+
+ * You should have received a copy of the GNU Affero General Public License
+ * along with this program.  If not, see <http://www.gnu.org/licenses/>.
+**/
+/* }}} */
+
+#ifndef YY_CY_STACK_HH_INCLUDED
+#define YY_CY_STACK_HH_INCLUDED
+
+namespace cy {
+
+template <class Type_>
+class stack {
+  public:
+    typedef std::reverse_iterator<Type_ *> const_iterator;
+
+  private:
+    Type_ *data_;
+    size_t size_;
+    size_t capacity_;
+
+    void destroy() {
+        data_ -= size_;
+        for (size_t i(0); i != size_; ++i)
+            data_[i].~Type_();
+    }
+
+    void reserve(size_t capacity) {
+        capacity_ = capacity;
+        Type_ *data(static_cast<Type_ *>(::operator new(sizeof(Type_) * capacity_)));
+
+        data_ -= size_;
+        for (size_t i(0); i != size_; ++i) {
+            Type_ &old(data_[i]);
+            new (data + i) Type_(old);
+            old.~Type_();
+        }
+
+        ::operator delete(data_);
+        data_ = data + size_;
+    }
+
+  public:
+    stack() :
+        data_(NULL),
+        size_(0)
+    {
+        reserve(200);
+    }
+
+    ~stack() {
+        destroy();
+        ::operator delete(data_);
+    }
+
+    _finline Type_ &operator [](size_t i) {
+        return data_[-1 - i];
+    }
+
+    _finline const Type_ &operator [](size_t i) const {
+        return data_[-1 - i];
+    }
+
+    _finline void push(Type_ &t) {
+        if (size_ == capacity_)
+            reserve(capacity_ * 2);
+        new (data_++) Type_(t);
+        ++size_;
+    }
+
+    _finline void pop() {
+        (--data_)->~Type_();
+        --size_;
+    }
+
+    _finline void pop(unsigned int size) {
+        for (; size != 0; --size)
+            pop();
+    }
+
+    void clear() {
+        destroy();
+        size_ = 0;
+    }
+
+    _finline size_t size() const {
+        return size_;
+    }
+
+    _finline const_iterator begin() const {
+        return const_iterator(data_);
+    }
+
+    _finline const_iterator end() const {
+        return const_iterator(data_ - size_);
+    }
+
+  private:
+    stack(const stack &);
+    stack &operator =(const stack &);
+};
+
+template <class Type_, class Stack_ = stack<Type_> >
+class slice {
+  public:
+    slice(const Stack_ &stack, unsigned int range) :
+        stack_(stack),
+        range_(range)
+    {
+    }
+
+    _finline const Type_ &operator [](unsigned int i) const {
+        return stack_[range_ - i];
+    }
+
+  private:
+    const Stack_ &stack_;
+    unsigned int range_;
+};
+
+}
+
+#endif/*YY_CY_STACK_HH_INCLUDED*/
-- 
2.47.2