The Tor Browser: js/src/jit/arm/Architecture-arm.cpp@129ffea94266 (annotated)

js/src/jit/arm/Architecture-arm.cpp@129ffea94266 (annotated)

js/src/jit/arm/Architecture-arm.cpp

Sat, 03 Jan 2015 20:18:00 +0100

author: Michael Schloh von Bennewitz <michael@schloh.com>
date: Sat, 03 Jan 2015 20:18:00 +0100
branch: TOR_BUG_3246
changeset 7: 129ffea94266
permissions: -rw-r--r--

Conditionally enable double key logic according to:
private browsing mode or privacy.thirdparty.isolate preference and
implement in GetCookieStringCommon and FindCookie where it counts...
With some reservations of how to convince FindCookie users to test
condition and pass a nullptr when disabling double key logic.

 /* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 4 -*-
  * vim: set ts=8 sts=4 et sw=4 tw=99:
  * This Source Code Form is subject to the terms of the Mozilla Public
  * License, v. 2.0. If a copy of the MPL was not distributed with this
  * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
 #include "jit/arm/Architecture-arm.h"
 #ifndef JS_ARM_SIMULATOR
 #include <elf.h>
 #endif
 #include <fcntl.h>
 #include <unistd.h>
 #include "jit/arm/Assembler-arm.h"
 #define HWCAP_USE_HARDFP_ABI (1 << 28)
 #if !(defined(ANDROID) || defined(MOZ_B2G)) && !defined(JS_ARM_SIMULATOR)
 #define HWCAP_ARMv7 (1 << 29)
 #include <asm/hwcap.h>
 #else
 #define HWCAP_VFP      (1<<0)
 #define HWCAP_VFPv3    (1<<1)
 #define HWCAP_VFPv3D16 (1<<2)
 #define HWCAP_VFPv4    (1<<3)
 #define HWCAP_IDIVA    (1<<4)
 #define HWCAP_IDIVT    (1<<5)
 #define HWCAP_NEON     (1<<6)
 #define HWCAP_ARMv7    (1<<7)
 #endif
 namespace js {
 namespace jit {
 uint32_t GetARMFlags()
 {
     static bool isSet = false;
     static uint32_t flags = 0;
     if (isSet)
         return flags;
 #ifdef JS_CODEGEN_ARM_HARDFP
     flags |= HWCAP_USE_HARDFP_ABI;
 #endif
     static const char *env = getenv("ARMHWCAP");
     if (env && env[0]) {
         if (strstr(env, "help")) {
             fflush(NULL);
             printf(
                    "\n"
                    "usage: ARMHWCAP=option,option,option,... where options can be:\n"
                    "\n"
                    "  armv7    \n"
                    "  vfp      \n"
                    "  neon     \n"
                    "  vfpv3    \n"
                    "  vfpv3d16 \n"
                    "  vfpv4    \n"
                    "  idiva    \n"
                    "  idivt    \n"
 #if defined(JS_ARM_SIMULATOR)
                    "  hardfp   \n"
 #endif
                    "\n"
                    );
             exit(0);
             /*NOTREACHED*/
         } else {
             // Canonicalize each token to have a leading and trailing space.
             const char *start = env;  // Token start.
             for (;;) {
                 char  ch = *start;
                 if (!ch) {
                     // End of string.
                     break;
                 }
                 if (ch == ' ' || ch == ',') {
                     // Skip separator characters.
                     start++;
                     continue;
                 }
                 // Find the end of the token.
                 const char *end = start + 1;
                 for (; ; end++) {
                     ch = *end;
                     if (!ch || ch == ' ' || ch == ',')
                         break;
                 }
                 size_t count = end - start;
                 if (count == 3 && strncmp(start, "vfp", 3) == 0)
                     flags |= HWCAP_VFP;
                 else if (count == 5 && strncmp(start, "vfpv3", 5) == 0)
                     flags |= HWCAP_VFPv3;
                 else if (count == 8 && strncmp(start, "vfpv3d16", 8) == 0)
                     flags |= HWCAP_VFPv3D16;
                 else if (count == 5 && strncmp(start, "vfpv4", 5) == 0)
                     flags |= HWCAP_VFPv4;
                 else if (count == 5 && strncmp(start, "idiva", 5) == 0)
                     flags |= HWCAP_IDIVA;
                 else if (count == 5 && strncmp(start, "idivt", 5) == 0)
                     flags |= HWCAP_IDIVT;
                 else if (count == 4 && strncmp(start, "neon", 4) == 0)
                     flags |= HWCAP_NEON;
                 else if (count == 5 && strncmp(start, "armv7", 5) == 0)
                     flags |= HWCAP_ARMv7;
 #if defined(JS_ARM_SIMULATOR)
                 else if (count == 6 && strncmp(start, "hardfp", 6) == 0)
                     flags |= HWCAP_USE_HARDFP_ABI;
 #endif
                 else
                     fprintf(stderr, "Warning: unexpected ARMHWCAP flag at: %s\n", start);
                 start = end;
             }
 #ifdef DEBUG
             IonSpew(IonSpew_Codegen, "ARMHWCAP: '%s'\n   flags: 0x%x\n", env, flags);
 #endif
             isSet = true;
             return flags;
         }
     }
 #ifdef JS_ARM_SIMULATOR
     isSet = true;
     flags = HWCAP_ARMv7 | HWCAP_VFP | HWCAP_VFPv3 | HWCAP_VFPv4 | HWCAP_NEON;
     return flags;
 #else
 #if WTF_OS_LINUX
     int fd = open("/proc/self/auxv", O_RDONLY);
     if (fd > 0) {
         Elf32_auxv_t aux;
         while (read(fd, &aux, sizeof(Elf32_auxv_t))) {
             if (aux.a_type == AT_HWCAP) {
                 close(fd);
                 flags = aux.a_un.a_val;
                 isSet = true;
 #if defined(__ARM_ARCH_7__) || defined (__ARM_ARCH_7A__)
                 // this should really be detected at runtime, but
                 // /proc/*/auxv doesn't seem to carry the ISA
                 // I could look in /proc/cpuinfo as well, but
                 // the chances that it will be different from this
                 // are low.
                 flags |= HWCAP_ARMv7;
 #endif
                 return flags;
             }
         }
         close(fd);
     }
 #if defined(__ARM_ARCH_7__) || defined (__ARM_ARCH_7A__)
     flags = HWCAP_ARMv7;
 #endif
     isSet = true;
     return flags;
 #elif defined(WTF_OS_ANDROID) || defined(MOZ_B2G)
     FILE *fp = fopen("/proc/cpuinfo", "r");
     if (!fp)
         return false;
     char buf[1024];
     memset(buf, 0, sizeof(buf));
     size_t len = fread(buf, sizeof(char), sizeof(buf) - 2, fp);
     fclose(fp);
     // Canonicalize each token to have a leading and trailing space.
     buf[len] = ' ';
     buf[len + 1] = '\0';
     for (size_t i = 0; i < len; i++) {
         char  ch = buf[i];
         if (!ch)
             break;
         else if (ch == '\n')
             buf[i] = 0x20;
         else
             buf[i] = ch;
     }
     if (strstr(buf, " vfp "))
         flags |= HWCAP_VFP;
     if (strstr(buf, " vfpv3 "))
         flags |= HWCAP_VFPv3;
     if (strstr(buf, " vfpv3d16 "))
         flags |= HWCAP_VFPv3D16;
     if (strstr(buf, " vfpv4 "))
         flags |= HWCAP_VFPv4;
     if (strstr(buf, " idiva "))
         flags |= HWCAP_IDIVA;
     if (strstr(buf, " idivt "))
         flags |= HWCAP_IDIVT;
     if (strstr(buf, " neon "))
         flags |= HWCAP_NEON;
     // not part of the HWCAP flag, but I need to know this, and we're not using
     //  that bit, so... I'm using it
     if (strstr(buf, "ARMv7"))
         flags |= HWCAP_ARMv7;
 #ifdef DEBUG
     IonSpew(IonSpew_Codegen, "ARMHWCAP: '%s'\n   flags: 0x%x\n", buf, flags);
 #endif
     isSet = true;
     return flags;
 #endif
     return 0;
 #endif // JS_ARM_SIMULATOR
 }
 bool hasMOVWT()
 {
     return GetARMFlags() & HWCAP_ARMv7;
 }
 bool hasVFPv3()
 {
     return GetARMFlags() & HWCAP_VFPv3;
 }
 bool hasVFP()
 {
     return GetARMFlags() & HWCAP_VFP;
 }
 bool has32DP()
 {
     return !(GetARMFlags() & HWCAP_VFPv3D16 && !(GetARMFlags() & HWCAP_NEON));
 }
 bool useConvReg()
 {
     return has32DP();
 }
 bool hasIDIV()
 {
 #if defined HWCAP_IDIVA
     return GetARMFlags() & HWCAP_IDIVA;
 #else
     return false;
 #endif
 }
 // This is defined in the header and inlined when not using the simulator.
 #if defined(JS_ARM_SIMULATOR)
 bool useHardFpABI()
 {
     return GetARMFlags() & HWCAP_USE_HARDFP_ABI;
 }
 #endif
 Registers::Code
 Registers::FromName(const char *name)
 {
     // Check for some register aliases first.
     if (strcmp(name, "ip") == 0)
         return ip;
     if (strcmp(name, "r13") == 0)
         return r13;
     if (strcmp(name, "lr") == 0)
         return lr;
     if (strcmp(name, "r15") == 0)
         return r15;
     for (size_t i = 0; i < Total; i++) {
         if (strcmp(GetName(i), name) == 0)
             return Code(i);
     }
     return Invalid;
 }
 FloatRegisters::Code
 FloatRegisters::FromName(const char *name)
 {
     for (size_t i = 0; i < Total; i++) {
         if (strcmp(GetName(i), name) == 0)
             return Code(i);
     }
     return Invalid;
 }
 } // namespace jit
 } // namespace js

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js/src/jit/arm/Architecture-arm.cpp@129ffea94266 (annotated)

js/src/jit/arm/Architecture-arm.cpp