eb381b9444
The RandomNumberGenerator is a pseudorandom number generator with 48-bit state. It is properly seeded using either (1) the --random-seed if specified, or (2) the entropy_source function if configured, or (3) /dev/urandom if available, or (4) falls back to Time and TimeTicks based seeding. Each Isolate now contains a RandomNumberGenerator, which replaces the previous private_random_seed. Every native context still has its own random_seed. But this random seed is now properly initialized during bootstrapping, instead of on-demand initialization. This will allow us to cleanup and speedup the HRandom implementation quite a lot (this is delayed for a followup CL)! Also stop messing with the system rand()/random(), which should not be done from a library anyway! We probably re-seeded the libc rand()/random() after the application (i.e. Chrome) already seeded it (with better entropy than what we used). Another followup CL will replace the use of the per-isolate random number generator for the address randomization and thereby get rid of the Isolate::UncheckedCurrent() usage in the platform code. TEST=cctest/test-random-number-generator,cctest/test-random R=mstarzinger@chromium.org Review URL: https://codereview.chromium.org/23548024 git-svn-id: http://v8.googlecode.com/svn/branches/bleeding_edge@16612 ce2b1a6d-e550-0410-aec6-3dcde31c8c00
86 lines
3.6 KiB
C++
86 lines
3.6 KiB
C++
// Copyright 2006-2008 the V8 project authors. All rights reserved.
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// Redistribution and use in source and binary forms, with or without
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// modification, are permitted provided that the following conditions are
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// met:
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//
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// * Redistributions of source code must retain the above copyright
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// notice, this list of conditions and the following disclaimer.
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// * Redistributions in binary form must reproduce the above
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// copyright notice, this list of conditions and the following
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// disclaimer in the documentation and/or other materials provided
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// with the distribution.
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// * Neither the name of Google Inc. nor the names of its
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// contributors may be used to endorse or promote products derived
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// from this software without specific prior written permission.
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//
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// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
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// "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
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// LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
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// A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
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// OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
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// SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
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// LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
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// DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
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// THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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// (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
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// OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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#ifndef V8_FLAGS_H_
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#define V8_FLAGS_H_
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#include "atomicops.h"
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namespace v8 {
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namespace internal {
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// Declare all of our flags.
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#define FLAG_MODE_DECLARE
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#include "flag-definitions.h"
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// The global list of all flags.
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class FlagList {
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public:
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// The list of all flags with a value different from the default
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// and their values. The format of the list is like the format of the
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// argv array passed to the main function, e.g.
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// ("--prof", "--log-file", "v8.prof", "--nolazy").
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//
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// The caller is responsible for disposing the list, as well
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// as every element of it.
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static List<const char*>* argv();
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// Set the flag values by parsing the command line. If remove_flags is
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// set, the flags and associated values are removed from (argc,
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// argv). Returns 0 if no error occurred. Otherwise, returns the argv
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// index > 0 for the argument where an error occurred. In that case,
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// (argc, argv) will remain unchanged independent of the remove_flags
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// value, and no assumptions about flag settings should be made.
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//
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// The following syntax for flags is accepted (both '-' and '--' are ok):
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//
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// --flag (bool flags only)
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// --noflag (bool flags only)
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// --flag=value (non-bool flags only, no spaces around '=')
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// --flag value (non-bool flags only)
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// -- (equivalent to --js_arguments, captures all remaining args)
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static int SetFlagsFromCommandLine(int* argc, char** argv, bool remove_flags);
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// Set the flag values by parsing the string str. Splits string into argc
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// substrings argv[], each of which consisting of non-white-space chars,
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// and then calls SetFlagsFromCommandLine() and returns its result.
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static int SetFlagsFromString(const char* str, int len);
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// Reset all flags to their default value.
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static void ResetAllFlags();
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// Print help to stdout with flags, types, and default values.
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static void PrintHelp();
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// Set flags as consequence of being implied by another flag.
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static void EnforceFlagImplications();
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};
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} } // namespace v8::internal
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#endif // V8_FLAGS_H_
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