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+<!DOCTYPE html>
+<html><head>
+<meta name="viewport" content="width=device-width, initial-scale=1.0">
+<meta http-equiv="content-type" content="text/html; charset=UTF-8">
+<link href="../sqlite.css" rel="stylesheet">
+<title>Memory Allocation Subsystem</title>
+<!-- path=../ -->
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+<body>
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+<!-- keywords: sqlite3_free sqlite3_malloc sqlite3_malloc64 sqlite3_msize sqlite3_realloc sqlite3_realloc64 -->
+<div class=nosearch>
+<a href="intro.html"><h2>SQLite C Interface</h2></a>
+<h2>Memory Allocation Subsystem</h2>
+</div>
+<blockquote><pre>
+void *sqlite3_malloc(int);
+void *sqlite3_malloc64(sqlite3_uint64);
+void *sqlite3_realloc(void*, int);
+void *sqlite3_realloc64(void*, sqlite3_uint64);
+void sqlite3_free(void*);
+sqlite3_uint64 sqlite3_msize(void*);
+</pre></blockquote>
+<p>
+The SQLite core uses these three routines for all of its own
+internal memory allocation needs. "Core" in the previous sentence
+does not include operating-system specific <a href="../vfs.html">VFS</a> implementation.  The
+Windows VFS uses native malloc() and free() for some operations.</p>
+
+<p>The sqlite3_malloc() routine returns a pointer to a block
+of memory at least N bytes in length, where N is the parameter.
+If sqlite3_malloc() is unable to obtain sufficient free
+memory, it returns a NULL pointer.  If the parameter N to
+sqlite3_malloc() is zero or negative then sqlite3_malloc() returns
+a NULL pointer.</p>
+
+<p>The sqlite3_malloc64(N) routine works just like
+sqlite3_malloc(N) except that N is an unsigned 64-bit integer instead
+of a signed 32-bit integer.</p>
+
+<p>Calling sqlite3_free() with a pointer previously returned
+by sqlite3_malloc() or sqlite3_realloc() releases that memory so
+that it might be reused.  The sqlite3_free() routine is
+a no-op if is called with a NULL pointer.  Passing a NULL pointer
+to sqlite3_free() is harmless.  After being freed, memory
+should neither be read nor written.  Even reading previously freed
+memory might result in a segmentation fault or other severe error.
+Memory corruption, a segmentation fault, or other severe error
+might result if sqlite3_free() is called with a non-NULL pointer that
+was not obtained from sqlite3_malloc() or sqlite3_realloc().</p>
+
+<p>The sqlite3_realloc(X,N) interface attempts to resize a
+prior memory allocation X to be at least N bytes.
+If the X parameter to sqlite3_realloc(X,N)
+is a NULL pointer then its behavior is identical to calling
+sqlite3_malloc(N).
+If the N parameter to sqlite3_realloc(X,N) is zero or
+negative then the behavior is exactly the same as calling
+sqlite3_free(X).
+sqlite3_realloc(X,N) returns a pointer to a memory allocation
+of at least N bytes in size or NULL if insufficient memory is available.
+If M is the size of the prior allocation, then min(N,M) bytes
+of the prior allocation are copied into the beginning of buffer returned
+by sqlite3_realloc(X,N) and the prior allocation is freed.
+If sqlite3_realloc(X,N) returns NULL and N is positive, then the
+prior allocation is not freed.</p>
+
+<p>The sqlite3_realloc64(X,N) interfaces works the same as
+sqlite3_realloc(X,N) except that N is a 64-bit unsigned integer instead
+of a 32-bit signed integer.</p>
+
+<p>If X is a memory allocation previously obtained from sqlite3_malloc(),
+sqlite3_malloc64(), sqlite3_realloc(), or sqlite3_realloc64(), then
+sqlite3_msize(X) returns the size of that memory allocation in bytes.
+The value returned by sqlite3_msize(X) might be larger than the number
+of bytes requested when X was allocated.  If X is a NULL pointer then
+sqlite3_msize(X) returns zero.  If X points to something that is not
+the beginning of memory allocation, or if it points to a formerly
+valid memory allocation that has now been freed, then the behavior
+of sqlite3_msize(X) is undefined and possibly harmful.</p>
+
+<p>The memory returned by sqlite3_malloc(), sqlite3_realloc(),
+sqlite3_malloc64(), and sqlite3_realloc64()
+is always aligned to at least an 8 byte boundary, or to a
+4 byte boundary if the <a href="../compile.html#4_byte_aligned_malloc">SQLITE_4_BYTE_ALIGNED_MALLOC</a> compile-time
+option is used.</p>
+
+<p>The pointer arguments to <a href="../c3ref/free.html">sqlite3_free()</a> and <a href="../c3ref/free.html">sqlite3_realloc()</a>
+must be either NULL or else pointers obtained from a prior
+invocation of <a href="../c3ref/free.html">sqlite3_malloc()</a> or <a href="../c3ref/free.html">sqlite3_realloc()</a> that have
+not yet been released.</p>
+
+<p>The application must not read or write any part of
+a block of memory after it has been released using
+<a href="../c3ref/free.html">sqlite3_free()</a> or <a href="../c3ref/free.html">sqlite3_realloc()</a>.
+</p><p>See also lists of
+  <a href="objlist.html">Objects</a>,
+  <a href="constlist.html">Constants</a>, and
+  <a href="funclist.html">Functions</a>.</p>
+