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#!/usr/bin/env ruby
# Copyright (C) 2011 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"
inputFlnm = ARGV.shift
outputFlnm = ARGV.shift
$stderr.puts "offlineasm: Parsing #{inputFlnm} and creating offset extractor #{outputFlnm}."
def emitMagicNumber
OFFSET_MAGIC_NUMBERS.each {
| number |
$output.puts "unsigned(#{number}),"
}
end
inputHash = "// offlineasm input hash: #{parseHash(inputFlnm)} #{selfHash}"
if FileTest.exist? outputFlnm
File.open(outputFlnm, "r") {
| inp |
firstLine = inp.gets
if firstLine and firstLine.chomp == inputHash
$stderr.puts "offlineasm: Nothing changed."
exit 0
end
}
end
originalAST = parse(inputFlnm)
#
# Optimize the AST to make configuration extraction faster. This reduces the AST to a form
# that only contains the things that matter for our purposes: offsets, sizes, and if
# statements.
#
class Node
def offsetsPruneTo(sequence)
children.each {
| child |
child.offsetsPruneTo(sequence)
}
end
def offsetsPrune
result = Sequence.new(codeOrigin, [])
offsetsPruneTo(result)
result
end
end
class IfThenElse
def offsetsPruneTo(sequence)
ifThenElse = IfThenElse.new(codeOrigin, predicate, thenCase.offsetsPrune)
ifThenElse.elseCase = elseCase.offsetsPrune
sequence.list << ifThenElse
end
end
class StructOffset
def offsetsPruneTo(sequence)
sequence.list << self
end
end
class Sizeof
def offsetsPruneTo(sequence)
sequence.list << self
end
end
prunedAST = originalAST.offsetsPrune
File.open(outputFlnm, "w") {
| outp |
$output = outp
outp.puts inputHash
length = 0
emitCodeInAllConfigurations(prunedAST) {
| settings, ast, backend, index |
offsetsList = ast.filter(StructOffset).uniq.sort
sizesList = ast.filter(Sizeof).uniq.sort
length += OFFSET_HEADER_MAGIC_NUMBERS.size + (OFFSET_MAGIC_NUMBERS.size + 1) * (1 + offsetsList.size + sizesList.size)
}
outp.puts "static const unsigned extractorTable[#{length}] = {"
emitCodeInAllConfigurations(prunedAST) {
| settings, ast, backend, index |
OFFSET_HEADER_MAGIC_NUMBERS.each {
| number |
$output.puts "unsigned(#{number}),"
}
offsetsList = ast.filter(StructOffset).uniq.sort
sizesList = ast.filter(Sizeof).uniq.sort
emitMagicNumber
outp.puts "#{index},"
offsetsList.each {
| offset |
emitMagicNumber
outp.puts "OFFLINE_ASM_OFFSETOF(#{offset.struct}, #{offset.field}),"
}
sizesList.each {
| offset |
emitMagicNumber
outp.puts "sizeof(#{offset.struct}),"
}
}
outp.puts "};"
}
$stderr.puts "offlineasm: offset extractor #{outputFlnm} successfully generated."
|
