X-Git-Url: https://git.saurik.com/cycript.git/blobdiff_plain/b799113bd4ec270504dd9f552142c1adfd6e583a..2fad14e52c8cde8c45003a2ebb6907a57ca380e4:/Pooling.hpp

diff --git a/Pooling.hpp b/Pooling.hpp
index 807182e..550a03a 100644
--- a/Pooling.hpp
+++ b/Pooling.hpp
@@ -1,21 +1,21 @@
 /* Cycript - Optimizing JavaScript Compiler/Runtime
- * Copyright (C) 2009-2013  Jay Freeman (saurik)
+ * Copyright (C) 2009-2015  Jay Freeman (saurik)
 */
 
-/* GNU General Public License, Version 3 {{{ */
+/* GNU Affero General Public License, Version 3 {{{ */
 /*
- * Cycript is free software: you can redistribute it and/or modify
- * it under the terms of the GNU General Public License as published
- * by the Free Software Foundation, either version 3 of the License,
- * or (at your option) any later version.
- *
- * Cycript is distributed in the hope that it will be useful, but
- * WITHOUT ANY WARRANTY; without even the implied warranty of
+ * 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 General Public License for more details.
- *
- * You should have received a copy of the GNU General Public License
- * along with Cycript.  If not, see <http://www.gnu.org/licenses/>.
+ * 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/>.
 **/
 /* }}} */
 
@@ -23,76 +23,202 @@
 #define CYCRIPT_POOLING_HPP
 
 #include <cstdarg>
+#include <cstdio>
 #include <cstdlib>
+#include <cstring>
 
-#include <apr_pools.h>
-#include <apr_strings.h>
+#include <algorithm>
+
+#include <stdint.h>
 
 #include "Exception.hpp"
 #include "Local.hpp"
 #include "Standard.hpp"
 
+// XXX: std::aligned_storage and alignof
+static const size_t CYAlignment(sizeof(void *));
+
+template <typename Type_>
+static void CYAlign(Type_ &data, size_t size) {
+    data = reinterpret_cast<Type_>((reinterpret_cast<uintptr_t>(data) + (size - 1)) & ~static_cast<uintptr_t>(size - 1));
+}
+
+class CYPool;
+_finline void *operator new(size_t size, CYPool &pool);
+_finline void *operator new [](size_t size, CYPool &pool);
+
 class CYPool {
   private:
-    apr_pool_t *pool_;
-
-  public:
-    CYPool() {
-        _aprcall(apr_pool_create(&pool_, NULL));
+    uint8_t *data_;
+    size_t size_;
+    size_t next_;
+
+    struct Cleaner {
+        Cleaner *next_;
+        void (*code_)(void *);
+        void *data_;
+
+        Cleaner(Cleaner *next, void (*code)(void *), void *data) :
+            next_(next),
+            code_(code),
+            data_(data)
+        {
+        }
+    } *cleaner_;
+
+    template <typename Type_>
+    static void delete_(void *data) {
+        reinterpret_cast<Type_ *>(data)->~Type_();
     }
 
-    CYPool(apr_pool_t *pool) :
-        pool_(pool)
+    CYPool(const CYPool &);
+
+  public:
+    CYPool(size_t next = 64) :
+        data_(NULL),
+        size_(0),
+        next_(next),
+        cleaner_(NULL)
     {
     }
 
     ~CYPool() {
-        apr_pool_destroy(pool_);
+        for (Cleaner *cleaner(cleaner_); cleaner != NULL; ) {
+            Cleaner *next(cleaner->next_);
+            (*cleaner->code_)(cleaner->data_);
+            cleaner = next;
+        }
+    }
+
+    template <typename Type_>
+    Type_ *malloc(size_t size, size_t alignment = CYAlignment) {
+        uint8_t *end(data_);
+        CYAlign(end, alignment);
+        end += size;
+
+        if (size_t(end - data_) > size_) {
+            size_t need(sizeof(Cleaner));
+            CYAlign(need, alignment);
+            need += size;
+            size_ = std::max<size_t>(next_, need);
+            next_ *= 2;
+            data_ = reinterpret_cast<uint8_t *>(::malloc(size_));
+            atexit(free, data_);
+            _assert(size <= size_);
+        }
+
+        uint8_t *data(data_);
+        CYAlign(data, alignment);
+        end = data + size;
+        size_ -= end - data_;
+        data_ = end;
+        return reinterpret_cast<Type_ *>(data);
     }
 
-    void Clear() {
-        apr_pool_clear(pool_);
+    char *strdup(const char *data) {
+        if (data == NULL)
+            return NULL;
+        return memdup(data, strlen(data) + 1, 1);
     }
 
-    operator apr_pool_t *() const {
-        return pool_;
+    template <typename Type_>
+    Type_ *memdup(const Type_ *data, size_t size, size_t alignment = CYAlignment) {
+        Type_ *copy(malloc<Type_>(size, alignment));
+        memcpy(copy, data, size);
+        return copy;
     }
 
-    void *operator()(size_t size) const {
-        return apr_palloc(pool_, size);
+    char *strndup(const char *data, size_t size) {
+        return strmemdup(data, strnlen(data, size));
     }
 
-    char *strdup(const char *data) const {
-        return apr_pstrdup(pool_, data);
+    char *strmemdup(const char *data, size_t size) {
+        char *copy(malloc<char>(size + 1, 1));
+        memcpy(copy, data, size);
+        copy[size] = '\0';
+        return copy;
     }
 
-    char *strndup(const char *data, size_t size) const {
-        return apr_pstrndup(pool_, data, size);
+    // XXX: this could be made much more efficient
+    __attribute__((__sentinel__))
+    char *strcat(const char *data, ...) {
+        size_t size(strlen(data)); {
+            va_list args;
+            va_start(args, data);
+
+            while (const char *arg = va_arg(args, const char *))
+                size += strlen(arg);
+
+            va_end(args);
+        }
+
+        char *copy(malloc<char>(size + 1, 1)); {
+            va_list args;
+            va_start(args, data);
+
+            size_t offset(strlen(data));
+            memcpy(copy, data, offset);
+
+            while (const char *arg = va_arg(args, const char *)) {
+                size_t size(strlen(arg));
+                memcpy(copy + offset, arg, size);
+                offset += size;
+            }
+
+            va_end(args);
+        }
+
+        copy[size] = '\0';
+        return copy;
     }
 
-    char *strmemdup(const char *data, size_t size) const {
-        return apr_pstrmemdup(pool_, data, size);
+    // XXX: most people using this might should use sprintf
+    char *itoa(long value) {
+        return sprintf(16, "%ld", value);
     }
 
-    char *sprintf(const char *format, ...) const {
+    __attribute__((__format__(__printf__, 3, 4)))
+    char *sprintf(size_t size, const char *format, ...) {
         va_list args;
         va_start(args, format);
-        char *data(vsprintf(format, args));
+        char *copy(vsprintf(size, format, args));
         va_end(args);
-        return data;
+        return copy;
+    }
+
+    char *vsprintf(size_t size, const char *format, va_list args) {
+        va_list copy;
+        va_copy(copy, args);
+        char buffer[size];
+        int writ(vsnprintf(buffer, size, format, copy));
+        va_end(copy);
+        _assert(writ >= 0);
+
+        if (size_t(writ) >= size)
+            return vsprintf(writ + 1, format, args);
+        return strmemdup(buffer, writ);
     }
 
-    char *vsprintf(const char *format, va_list args) const {
-        return apr_pvsprintf(pool_, format, args);
+    void atexit(void (*code)(void *), void *data = NULL);
+
+    template <typename Type_>
+    Type_ &object() {
+        Type_ *value(new(*this) Type_());
+        atexit(&delete_<Type_>, value);
+        return *value;
     }
 };
 
 _finline void *operator new(size_t size, CYPool &pool) {
-    return pool(size);
+    return pool.malloc<void>(size);
 }
 
 _finline void *operator new [](size_t size, CYPool &pool) {
-    return pool(size);
+    return pool.malloc<void>(size);
+}
+
+_finline void CYPool::atexit(void (*code)(void *), void *data) {
+    cleaner_ = new(*this) Cleaner(cleaner_, code, data);
 }
 
 struct CYData {
@@ -114,7 +240,7 @@ struct CYData {
     }
 
     static void *operator new(size_t size, CYPool &pool) {
-        void *data(pool(size));
+        void *data(pool.malloc<void>(size));
         reinterpret_cast<CYData *>(data)->pool_ = &pool;
         return data;
     }
@@ -152,7 +278,7 @@ struct CYPoolAllocator {
     }
 
     pointer allocate(size_type size, const void *hint = 0) {
-        return reinterpret_cast<pointer>((*pool_)(size));
+        return pool_->malloc<value_type>(size);
     }
 
     void deallocate(pointer data, size_type size) {
@@ -199,4 +325,7 @@ class CYLocalPool :
 #define $pool \
     (*CYLocal<CYPool>::Get())
 
+template <>
+::pthread_key_t CYLocal<CYPool>::key_;
+
 #endif/*CYCRIPT_POOLING_HPP*/