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generate_offset_extractor.rb
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#!/usr/bin/env ruby
# Copyright (C) 2011-2018 Apple Inc. All rights reserved.
#
# Redistribution and use in source and binary forms, with or without
# modification, are permitted provided that the following conditions
# are met:
# 1. Redistributions of source code must retain the above copyright
# notice, this list of conditions and the following disclaimer.
# 2. Redistributions in binary form must reproduce the above copyright
# notice, this list of conditions and the following disclaimer in the
# documentation and/or other materials provided with the distribution.
#
# THIS SOFTWARE IS PROVIDED BY APPLE INC. AND ITS CONTRIBUTORS ``AS IS''
# AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO,
# THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
# PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL APPLE INC. OR ITS CONTRIBUTORS
# BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
# CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
# SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
# INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
# CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
# ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF
# THE POSSIBILITY OF SUCH DAMAGE.
$: << File.dirname(__FILE__)
require "config"
require "backends"
require "digest/sha1"
require "offsets"
require "parser"
require "self_hash"
require "settings"
require "transform"
IncludeFile.processIncludeOptions()
inputFlnm = ARGV.shift
settingsFlnm = ARGV.shift
outputFlnm = ARGV.shift
validBackends = canonicalizeBackendNames(ARGV.shift.split(/[,\s]+/))
includeOnlyBackends(validBackends)
variants = ARGV.shift.split(/[,\s]+/)
begin
configurationList = configurationIndicesForVariants(settingsFlnm, variants)
rescue MissingMagicValuesException
$stderr.puts "OffsetExtractor: No magic values found. Skipping offsets extractor file generation."
exit 1
end
def emitMagicNumber
OFFSET_MAGIC_NUMBERS.each {
| number |
$output.puts "unsigned(#{number}),"
}
end
configurationHash = Digest::SHA1.hexdigest(configurationList.join(' '))
inputHash = "// OffsetExtractor input hash: #{parseHash(inputFlnm)} #{configurationHash} #{selfHash}"
if FileTest.exist? outputFlnm
File.open(outputFlnm, "r") {
| inp |
firstLine = inp.gets
if firstLine and firstLine.chomp == inputHash
# Nothing changed.
exit 0
end
}
end
ast = parse(inputFlnm)
settingsCombinations = computeSettingsCombinations(ast)
File.open(outputFlnm, "w") {
| outp |
$output = outp
outp.puts inputHash
configurationList.each {
| configIndex |
forSettings(settingsCombinations[configIndex], ast) {
| concreteSettings, lowLevelAST, backend |
lowLevelAST = lowLevelAST.demacroify({})
offsetsList = offsetsList(lowLevelAST)
sizesList = sizesList(lowLevelAST)
constsList = constsList(lowLevelAST)
emitCodeInConfiguration(concreteSettings, lowLevelAST, backend) {
constsList.each_with_index {
| const, index |
outp.puts "constexpr int64_t constValue#{index} = static_cast<int64_t>(#{const.value});"
}
outp.puts "static const int64_t offsetExtractorTable[] = {"
OFFSET_HEADER_MAGIC_NUMBERS.each {
| number |
outp.puts "unsigned(#{number}),"
}
emitMagicNumber
outp.puts "#{configIndex},"
offsetsList.each {
| offset |
emitMagicNumber
outp.puts "OFFLINE_ASM_OFFSETOF(#{offset.struct}, #{offset.field}),"
}
sizesList.each {
| sizeof |
emitMagicNumber
outp.puts "sizeof(#{sizeof.struct}),"
}
constsList.each_with_index {
| const, index |
emitMagicNumber
outp.puts "constValue#{index},"
}
outp.puts "};"
}
}
}
outp.puts "static const int64_t offsetExtractorTable[] = { };" if not configurationList.size
}