From 570c4da40a76ac9ec8fddfbab202b9290d7d44e5 Mon Sep 17 00:00:00 2001
From: David Robillard <d@drobilla.net>
Date: Tue, 9 Apr 2019 10:28:59 +0200
Subject: Allocate nodes with posix_memalign when available

This fixes platforms where the system malloc returns memory that is not aligned
to sizeof(SerdNode) (128 bits).
---
 src/node.c   | 15 +++++++++++----
 src/system.c | 29 +++++++++++++++++++++++++----
 src/system.h |  8 +++++++-
 3 files changed, 43 insertions(+), 9 deletions(-)

diff --git a/src/node.c b/src/node.c
index b6e5f01d..b31cc01c 100644
--- a/src/node.c
+++ b/src/node.c
@@ -19,6 +19,7 @@
 #include "serd_internal.h"
 #include "static_nodes.h"
 #include "string_utils.h"
+#include "system.h"
 
 #include <assert.h>
 #include <float.h>
@@ -92,11 +93,13 @@ SerdNode*
 serd_node_malloc(size_t n_bytes, SerdNodeFlags flags, SerdNodeType type)
 {
 	const size_t size = sizeof(SerdNode) + serd_node_pad_size(n_bytes);
-	SerdNode*    node = (SerdNode*)calloc(1, size);
+	SerdNode*    node = (SerdNode*)serd_calloc_aligned(size, serd_node_align);
+
+	assert((uintptr_t)node % serd_node_align == 0);
+
 	node->n_bytes = 0;
 	node->flags   = flags;
 	node->type    = type;
-	assert((intptr_t)node % serd_node_align == 0);
 	return node;
 }
 
@@ -337,9 +340,13 @@ serd_node_copy(const SerdNode* node)
 		return NULL;
 	}
 
-	const size_t size = serd_node_total_size(node);
 	serd_node_check_padding(node);
-	SerdNode*    copy = (SerdNode*)calloc(1, size + 3);
+
+	const size_t size = serd_node_total_size(node);
+	SerdNode* copy = (SerdNode*)serd_calloc_aligned(size + 3, serd_node_align);
+
+	assert((intptr_t)node % serd_node_align == 0);
+
 	memcpy(copy, node, size);
 	return copy;
 }
diff --git a/src/system.c b/src/system.c
index 1af179f5..4d8633ee 100644
--- a/src/system.c
+++ b/src/system.c
@@ -1,5 +1,5 @@
 /*
-  Copyright 2011-2018 David Robillard <http://drobilla.net>
+  Copyright 2011-2019 David Robillard <http://drobilla.net>
 
   Permission to use, copy, modify, and/or distribute this software for any
   purpose with or without fee is hereby granted, provided that the above
@@ -21,15 +21,36 @@
 #include "serd_config.h"
 
 #include <stdlib.h>
+#include <string.h>
 
 void*
-serd_allocate_buffer(size_t size)
+serd_malloc_aligned(size_t size, size_t alignment)
 {
 #ifdef HAVE_POSIX_MEMALIGN
-	void* ptr;
-	const int ret = posix_memalign(&ptr, SERD_PAGE_SIZE, size);
+	void*     ptr = NULL;
+	const int ret = posix_memalign(&ptr, alignment, size);
 	return ret ? NULL : ptr;
 #else
 	return malloc(size);
 #endif
 }
+
+void*
+serd_calloc_aligned(size_t size, size_t alignment)
+{
+#ifdef HAVE_POSIX_MEMALIGN
+	void* ptr = serd_malloc_aligned(size, alignment);
+	if (ptr) {
+		memset(ptr, 0, size);
+	}
+	return ptr;
+#else
+	return calloc(1, size);
+#endif
+}
+
+void*
+serd_allocate_buffer(size_t size)
+{
+	return serd_malloc_aligned(size, SERD_PAGE_SIZE);
+}
diff --git a/src/system.h b/src/system.h
index f17eb278..dcb5dbaa 100644
--- a/src/system.h
+++ b/src/system.h
@@ -1,5 +1,5 @@
 /*
-  Copyright 2011-2018 David Robillard <http://drobilla.net>
+  Copyright 2011-2019 David Robillard <http://drobilla.net>
 
   Permission to use, copy, modify, and/or distribute this software for any
   purpose with or without fee is hereby granted, provided that the above
@@ -38,6 +38,12 @@ serd_file_read_byte(void* buf, size_t size, size_t nmemb, void* stream)
 	return 1;
 }
 
+/** Allocate a buffer aligned to `alignment` bytes. */
+void* serd_malloc_aligned(size_t size, size_t alignment);
+
+/** Allocate a zeroed buffer aligned to `alignment` bytes. */
+void* serd_calloc_aligned(size_t size, size_t alignment);
+
 /** Allocate an aligned buffer for I/O. */
 void* serd_allocate_buffer(size_t size);
 
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