[sr-dev] git:master:90f4bd59: Revert "core/mem: removed tlsf_malloc_bits.h"

[Daniel-Constantin Mierla]

Module: kamailio
Branch: master
Commit: 90f4bd591aba7c6fbe234df1f3868edf4ff0a9f1
URL: https://github.com/kamailio/kamailio/commit/90f4bd591aba7c6fbe234df1f3868edf4ff0a9f1

Author: Daniel-Constantin Mierla <miconda at gmail.com>
Committer: Daniel-Constantin Mierla <miconda at gmail.com>
Date: 2021-09-06T10:29:50+02:00

Revert "core/mem: removed tlsf_malloc_bits.h"

This reverts commit 2d7aee506c617f2d258719562f8debf2b4ba087e.

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Added: src/core/mem/tlsf_malloc_bits.h

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Diff:  https://github.com/kamailio/kamailio/commit/90f4bd591aba7c6fbe234df1f3868edf4ff0a9f1.diff
Patch: https://github.com/kamailio/kamailio/commit/90f4bd591aba7c6fbe234df1f3868edf4ff0a9f1.patch

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diff --git a/src/core/mem/tlsf_malloc_bits.h b/src/core/mem/tlsf_malloc_bits.h
new file mode 100644
index 0000000000..29c783d4a4
--- /dev/null
+++ b/src/core/mem/tlsf_malloc_bits.h
@@ -0,0 +1,119 @@
+#ifndef INCLUDED_tlsfbits
+#define INCLUDED_tlsfbits
+
+#if defined(__cplusplus)
+#define tlsf_decl inline
+#else
+#define tlsf_decl static
+#endif
+
+/*
+** Architecture-specific bit manipulation routines.
+**
+** TLSF achieves O(1) cost for malloc and free operations by limiting
+** the search for a free block to a free list of guaranteed size
+** adequate to fulfill the request, combined with efficient free list
+** queries using bitmasks and architecture-specific bit-manipulation
+** routines.
+**
+** Most modern processors provide instructions to count leading zeroes
+** in a word, find the lowest and highest set bit, etc. These
+** specific implementations will be used when available, falling back
+** to a reasonably efficient generic implementation.
+**
+** NOTE: TLSF spec relies on ffs/fls returning value 0..31.
+** ffs/fls return 1-32 by default, returning 0 for error.
+*/
+
+/*
+** Detect whether or not we are building for a 32- or 64-bit (LP/LLP)
+** architecture. There is no reliable portable method at compile-time.
+*/
+#if defined (__alpha__) || defined (__ia64__) || defined (__x86_64__) \
+	|| defined (_WIN64) || defined (__LP64__) || defined (__LLP64__)
+#define TLSF_64BIT
+#endif
+
+/*
+** gcc 3.4 and above have builtin support, specialized for architecture.
+** Some compilers masquerade as gcc; patchlevel test filters them out.
+**
+** Note: clang is compatible with GCC builtins and will also define those macros
+*/
+#if defined (__GNUC__) && (__GNUC__ > 3 || (__GNUC__ == 3 && __GNUC_MINOR__ >= 4)) \
+	&& defined (__GNUC_PATCHLEVEL__)
+
+tlsf_decl int tlsf_ffs(unsigned int word)
+{
+	return __builtin_ffs(word) - 1;
+}
+
+tlsf_decl int tlsf_fls(unsigned int word)
+{
+	const int bit = word ? 32 - __builtin_clz(word) : 0;
+	return bit - 1;
+}
+
+#if defined (TLSF_64BIT)
+tlsf_decl int tlsf_fls_sizet(size_t size)
+{
+	const int bit = size ? 64 - __builtin_clzl(size) : 0;
+	return bit - 1;
+}
+#endif
+#else
+/* Fall back to generic implementation. */
+
+tlsf_decl int tlsf_fls_generic(unsigned int word)
+{
+	int bit = 32;
+
+	if (!word) bit -= 1;
+	if (!(word & 0xffff0000)) { word <<= 16; bit -= 16; }
+	if (!(word & 0xff000000)) { word <<= 8; bit -= 8; }
+	if (!(word & 0xf0000000)) { word <<= 4; bit -= 4; }
+	if (!(word & 0xc0000000)) { word <<= 2; bit -= 2; }
+	if (!(word & 0x80000000)) { word <<= 1; bit -= 1; }
+
+	return bit;
+}
+
+/* Implement ffs in terms of fls. */
+tlsf_decl int tlsf_ffs(unsigned int word)
+{
+	return tlsf_fls_generic(word & (~word + 1)) - 1;
+}
+
+tlsf_decl int tlsf_fls(unsigned int word)
+{
+	return tlsf_fls_generic(word) - 1;
+}
+
+#if defined (TLSF_64BIT)
+tlsf_decl int tlsf_fls_sizet(size_t size)
+{
+	int high = (int)(size >> 32);
+	int bits = 0;
+	if (high)
+	{
+		bits = 32 + tlsf_fls(high);
+	}
+	else
+	{
+		bits = tlsf_fls((int)size & 0xffffffff);
+
+	}
+	return bits;
+}
+#endif /* defined (TLSF_64BIT) */
+
+#endif /* GNUC */
+
+
+#if !defined (TLSF_64BIT)
+#define tlsf_fls_sizet tlsf_fls
+#endif
+
+#undef tlsf_decl
+
+#endif