Merge "webrtc: Use the NDK cpufeatures directly"

2 files changed, 2 insertions, 399 deletions

diff --git a/webrtc/system_wrappers/source/Android.mk b/webrtc/system_wrappers/source/Android.mk
index 5fa5bdda97..91cbb4c1d4 100644
--- a/webrtc/system_wrappers/source/Android.mk
+++ b/webrtc/system_wrappers/source/Android.mk
@@ -17,7 +17,6 @@ LOCAL_MODULE := libwebrtc_system_wrappers
 LOCAL_MODULE_TAGS := optional
 LOCAL_CPP_EXTENSION := .cc
 LOCAL_SRC_FILES := \
-    android/cpu-features.c \
     cpu_features_android.c \
     sort.cc \
     aligned_malloc.cc \
@@ -62,4 +61,6 @@ LOCAL_SDK_VERSION := 14
 LOCAL_MODULE := $(LOCAL_MODULE)_$(WEBRTC_STL)
 endif
 
+LOCAL_WHOLE_STATIC_LIBRARIES += cpufeatures
+
 include $(BUILD_STATIC_LIBRARY)
diff --git a/webrtc/system_wrappers/source/android/cpu-features.c b/webrtc/system_wrappers/source/android/cpu-features.c
deleted file mode 100644
index 749e7b3781..0000000000
--- a/webrtc/system_wrappers/source/android/cpu-features.c
+++ /dev/null
@@ -1,398 +0,0 @@
-/*
- *  Copyright (c) 2012 The WebRTC project authors. All Rights Reserved.
- *
- *  Use of this source code is governed by a BSD-style license
- *  that can be found in the LICENSE file in the root of the source
- *  tree. An additional intellectual property rights grant can be found
- *  in the file PATENTS.  All contributing project authors may
- *  be found in the AUTHORS file in the root of the source tree.
- */
-
-#include <sys/system_properties.h>
-#ifdef __arm__
-#include <machine/cpu-features.h>
-#endif
-#include <pthread.h>
-#include "cpu-features.h"
-#include <stdio.h>
-#include <stdlib.h>
-#include <string.h>
-#include <unistd.h>
-#include <fcntl.h>
-#include <errno.h>
-
-static  pthread_once_t     g_once;
-static  AndroidCpuFamily   g_cpuFamily;
-static  uint64_t           g_cpuFeatures;
-static  int                g_cpuCount;
-
-static const int  android_cpufeatures_debug = 0;
-
-#ifdef __arm__
-#  define DEFAULT_CPU_FAMILY  ANDROID_CPU_FAMILY_ARM
-#elif defined __i386__
-#  define DEFAULT_CPU_FAMILY  ANDROID_CPU_FAMILY_X86
-#else
-#  define DEFAULT_CPU_FAMILY  ANDROID_CPU_FAMILY_UNKNOWN
-#endif
-
-#define  D(...) \
-    do { \
-        if (android_cpufeatures_debug) { \
-            printf(__VA_ARGS__); fflush(stdout); \
-        } \
-    } while (0)
-
-#ifdef __i386__
-static __inline__ void x86_cpuid(int func, int values[4])
-{
-    int a, b, c, d;
-    /* We need to preserve ebx since we're compiling PIC code */
-    /* this means we can't use "=b" for the second output register */
-    __asm__ __volatile__ ( \
-      "push %%ebx\n"
-      "cpuid\n" \
-      "mov %1, %%ebx\n"
-      "pop %%ebx\n"
-      : "=a" (a), "=r" (b), "=c" (c), "=d" (d) \
-      : "a" (func) \
-    );
-    values[0] = a;
-    values[1] = b;
-    values[2] = c;
-    values[3] = d;
-}
-#endif
-
-/* Read the content of /proc/cpuinfo into a user-provided buffer.
- * Return the length of the data, or -1 on error. Does *not*
- * zero-terminate the content. Will not read more
- * than 'buffsize' bytes.
- */
-static int
-read_file(const char*  pathname, char*  buffer, size_t  buffsize)
-{
-    int  fd, len;
-
-    fd = open(pathname, O_RDONLY);
-    if (fd < 0)
-        return -1;
-
-    do {
-        len = read(fd, buffer, buffsize);
-    } while (len < 0 && errno == EINTR);
-
-    close(fd);
-
-    return len;
-}
-
-/* Extract the content of a the first occurence of a given field in
- * the content of /proc/cpuinfo and return it as a heap-allocated
- * string that must be freed by the caller.
- *
- * Return NULL if not found
- */
-static char*
-extract_cpuinfo_field(char* buffer, int buflen, const char* field)
-{
-    int  fieldlen = strlen(field);
-    char* bufend = buffer + buflen;
-    char* result = NULL;
-    int len, ignore;
-    const char *p, *q;
-
-    /* Look for first field occurence, and ensures it starts the line.
-     */
-    p = buffer;
-    bufend = buffer + buflen;
-    for (;;) {
-        p = memmem(p, bufend-p, field, fieldlen);
-        if (p == NULL)
-            goto EXIT;
-
-        if (p == buffer || p[-1] == '\n')
-            break;
-
-        p += fieldlen;
-    }
-
-    /* Skip to the first column followed by a space */
-    p += fieldlen;
-    p  = memchr(p, ':', bufend-p);
-    if (p == NULL || p[1] != ' ')
-        goto EXIT;
-
-    /* Find the end of the line */
-    p += 2;
-    q = memchr(p, '\n', bufend-p);
-    if (q == NULL)
-        q = bufend;
-
-    /* Copy the line into a heap-allocated buffer */
-    len = q-p;
-    result = malloc(len+1);
-    if (result == NULL)
-        goto EXIT;
-
-    memcpy(result, p, len);
-    result[len] = '\0';
-
-EXIT:
-    return result;
-}
-
-/* Count the number of occurences of a given field prefix in /proc/cpuinfo.
- */
-static int
-count_cpuinfo_field(char* buffer, int buflen, const char* field)
-{
-    int fieldlen = strlen(field);
-    const char* p = buffer;
-    const char* bufend = buffer + buflen;
-    const char* q;
-    int count = 0;
-
-    for (;;) {
-        const char* q;
-
-        p = memmem(p, bufend-p, field, fieldlen);
-        if (p == NULL)
-            break;
-
-        /* Ensure that the field is at the start of a line */
-        if (p > buffer && p[-1] != '\n') {
-            p += fieldlen;
-            continue;
-        }
-
-
-        /* skip any whitespace */
-        q = p + fieldlen;
-        while (q < bufend && (*q == ' ' || *q == '\t'))
-            q++;
-
-        /* we must have a colon now */
-        if (q < bufend && *q == ':') {
-            count += 1;
-            q ++;
-        }
-        p = q;
-    }
-
-    return count;
-}
-
-/* Like strlen(), but for constant string literals */
-#define STRLEN_CONST(x)  ((sizeof(x)-1)
-
-
-/* Checks that a space-separated list of items contains one given 'item'.
- * Returns 1 if found, 0 otherwise.
- */
-static int
-has_list_item(const char* list, const char* item)
-{
-    const char*  p = list;
-    int itemlen = strlen(item);
-
-    if (list == NULL)
-        return 0;
-
-    while (*p) {
-        const char*  q;
-
-        /* skip spaces */
-        while (*p == ' ' || *p == '\t')
-            p++;
-
-        /* find end of current list item */
-        q = p;
-        while (*q && *q != ' ' && *q != '\t')
-            q++;
-
-        if (itemlen == q-p && !memcmp(p, item, itemlen))
-            return 1;
-
-        /* skip to next item */
-        p = q;
-    }
-    return 0;
-}
-
-
-static void
-android_cpuInit(void)
-{
-    char cpuinfo[4096];
-    int  cpuinfo_len;
-
-    g_cpuFamily   = DEFAULT_CPU_FAMILY;
-    g_cpuFeatures = 0;
-    g_cpuCount    = 1;
-
-    cpuinfo_len = read_file("/proc/cpuinfo", cpuinfo, sizeof cpuinfo);
-    D("cpuinfo_len is (%d):\n%.*s\n", cpuinfo_len,
-      cpuinfo_len >= 0 ? cpuinfo_len : 0, cpuinfo);
-
-    if (cpuinfo_len < 0)  /* should not happen */ {
-        return;
-    }
-
-    /* Count the CPU cores, the value may be 0 for single-core CPUs */
-    g_cpuCount = count_cpuinfo_field(cpuinfo, cpuinfo_len, "processor");
-    if (g_cpuCount == 0) {
-        g_cpuCount = count_cpuinfo_field(cpuinfo, cpuinfo_len, "Processor");
-        if (g_cpuCount == 0) {
-            g_cpuCount = 1;
-        }
-    }
-
-    D("found cpuCount = %d\n", g_cpuCount);
-
-#ifdef __ARM_ARCH__
-    {
-        char*  features = NULL;
-        char*  architecture = NULL;
-
-        /* Extract architecture from the "CPU Architecture" field.
-         * The list is well-known, unlike the the output of
-         * the 'Processor' field which can vary greatly.
-         *
-         * See the definition of the 'proc_arch' array in
-         * $KERNEL/arch/arm/kernel/setup.c and the 'c_show' function in
-         * same file.
-         */
-        char* cpuArch = extract_cpuinfo_field(cpuinfo, cpuinfo_len, "CPU architecture");
-
-        if (cpuArch != NULL) {
-            char*  end;
-            long   archNumber;
-            int    hasARMv7 = 0;
-
-            D("found cpuArch = '%s'\n", cpuArch);
-
-            /* read the initial decimal number, ignore the rest */
-            archNumber = strtol(cpuArch, &end, 10);
-
-            /* Here we assume that ARMv8 will be upwards compatible with v7
-                * in the future. Unfortunately, there is no 'Features' field to
-                * indicate that Thumb-2 is supported.
-                */
-            if (end > cpuArch && archNumber >= 7) {
-                hasARMv7 = 1;
-            }
-
-            /* Unfortunately, it seems that certain ARMv6-based CPUs
-             * report an incorrect architecture number of 7!
-             *
-             * See http://code.google.com/p/android/issues/detail?id=10812
-             *
-             * We try to correct this by looking at the 'elf_format'
-             * field reported by the 'Processor' field, which is of the
-             * form of "(v7l)" for an ARMv7-based CPU, and "(v6l)" for
-             * an ARMv6-one.
-             */
-            if (hasARMv7) {
-                char* cpuProc = extract_cpuinfo_field(cpuinfo, cpuinfo_len,
-                                                      "Processor");
-                if (cpuProc != NULL) {
-                    D("found cpuProc = '%s'\n", cpuProc);
-                    if (has_list_item(cpuProc, "(v6l)")) {
-                        D("CPU processor and architecture mismatch!!\n");
-                        hasARMv7 = 0;
-                    }
-                    free(cpuProc);
-                }
-            }
-
-            if (hasARMv7) {
-                g_cpuFeatures |= ANDROID_CPU_ARM_FEATURE_ARMv7;
-            }
-
-            /* The LDREX / STREX instructions are available from ARMv6 */
-            if (archNumber >= 6) {
-                g_cpuFeatures |= ANDROID_CPU_ARM_FEATURE_LDREX_STREX;
-            }
-
-            free(cpuArch);
-        }
-
-        /* Extract the list of CPU features from 'Features' field */
-        char* cpuFeatures = extract_cpuinfo_field(cpuinfo, cpuinfo_len, "Features");
-
-        if (cpuFeatures != NULL) {
-
-            D("found cpuFeatures = '%s'\n", cpuFeatures);
-
-            if (has_list_item(cpuFeatures, "vfpv3"))
-                g_cpuFeatures |= ANDROID_CPU_ARM_FEATURE_VFPv3;
-
-            else if (has_list_item(cpuFeatures, "vfpv3d16"))
-                g_cpuFeatures |= ANDROID_CPU_ARM_FEATURE_VFPv3;
-
-            if (has_list_item(cpuFeatures, "neon")) {
-                /* Note: Certain kernels only report neon but not vfpv3
-                    *       in their features list. However, ARM mandates
-                    *       that if Neon is implemented, so must be VFPv3
-                    *       so always set the flag.
-                    */
-                g_cpuFeatures |= ANDROID_CPU_ARM_FEATURE_NEON |
-                                 ANDROID_CPU_ARM_FEATURE_VFPv3;
-            }
-            free(cpuFeatures);
-        }
-    }
-#endif /* __ARM_ARCH__ */
-
-#ifdef __i386__
-    g_cpuFamily = ANDROID_CPU_FAMILY_X86;
-
-    int regs[4];
-
-/* According to http://en.wikipedia.org/wiki/CPUID */
-#define VENDOR_INTEL_b  0x756e6547
-#define VENDOR_INTEL_c  0x6c65746e
-#define VENDOR_INTEL_d  0x49656e69
-
-    x86_cpuid(0, regs);
-    int vendorIsIntel = (regs[1] == VENDOR_INTEL_b &&
-                         regs[2] == VENDOR_INTEL_c &&
-                         regs[3] == VENDOR_INTEL_d);
-
-    x86_cpuid(1, regs);
-    if ((regs[2] & (1 << 9)) != 0) {
-        g_cpuFeatures |= ANDROID_CPU_X86_FEATURE_SSSE3;
-    }
-    if ((regs[2] & (1 << 23)) != 0) {
-        g_cpuFeatures |= ANDROID_CPU_X86_FEATURE_POPCNT;
-    }
-    if (vendorIsIntel && (regs[2] & (1 << 22)) != 0) {
-        g_cpuFeatures |= ANDROID_CPU_X86_FEATURE_MOVBE;
-    }
-#endif
-}
-
-
-AndroidCpuFamily
-android_getCpuFamily(void)
-{
-    pthread_once(&g_once, android_cpuInit);
-    return g_cpuFamily;
-}
-
-
-uint64_t
-android_getCpuFeatures(void)
-{
-    pthread_once(&g_once, android_cpuInit);
-    return g_cpuFeatures;
-}
-
-
-int
-android_getCpuCount(void)
-{
-    pthread_once(&g_once, android_cpuInit);
-    return g_cpuCount;
-}