JavaScriptCore-iOS/JavaScriptCore/offlineasm/settings.rb at master · fealebenpae/JavaScriptCore-iOS

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# 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.

require "config"

require "ast"

require "backends"

require "parser"

require "transform"

# computeSettingsCombinations(ast) -> settingsCombiations

# Computes an array of settings maps, where a settings map constitutes

# a configuration for the assembly code being generated. The map

# contains key value pairs where keys are settings names (strings) and

# the values are booleans (true for enabled, false for disabled).

def computeSettingsCombinations(ast)

settingsCombinations = []

def settingsCombinator(settingsCombinations, mapSoFar, remaining)

if remaining.empty?

settingsCombinations << mapSoFar

return

end

newMap = mapSoFar.dup

newMap[remaining[0]] = true

settingsCombinator(settingsCombinations, newMap, remaining[1..-1])

newMap = mapSoFar.dup

newMap[remaining[0]] = false

settingsCombinator(settingsCombinations, newMap, remaining[1..-1])

end

settingsCombinator(settingsCombinations, {}, (ast.filter(Setting).uniq.collect{|v| v.name} + BACKENDS).uniq)

settingsCombinations

end

# forSettings(concreteSettings, ast) {

# | concreteSettings, lowLevelAST, backend | ... }

# Determines if the settings combination is valid, and if so, calls

# the block with the information you need to generate code.

def forSettings(concreteSettings, ast)

# Check which architectures this combinator claims to support.

numClaimedBackends = 0

selectedBackend = nil

BACKENDS.each {

| backend |

isSupported = concreteSettings[backend]

raise unless isSupported != nil

numClaimedBackends += if isSupported then 1 else 0 end

if isSupported

selectedBackend = backend

end

}

return if numClaimedBackends > 1

# Resolve the AST down to a low-level form (no macros or conditionals).

lowLevelAST = ast.resolveSettings(concreteSettings)

yield concreteSettings, lowLevelAST, selectedBackend

end

# forEachValidSettingsCombination(ast) {

# | concreteSettings, ast, backend, index | ... }

# forEachValidSettingsCombination(ast, settingsCombinations) {

# | concreteSettings, ast, backend, index | ... }

# Executes the given block for each valid settings combination in the

# settings map. The ast passed into the block is resolved

# (ast.resolve) against the settings.

# The first form will call computeSettingsCombinations(ast) for you.

def forEachValidSettingsCombination(ast, *optionalSettingsCombinations)

raise if optionalSettingsCombinations.size > 1

if optionalSettingsCombinations.empty?

settingsCombinations = computeSettingsCombinations(ast)

else

settingsCombinations = optionalSettingsCombiations[0]

end

settingsCombinations.each_with_index {

| concreteSettings, index |

forSettings(concreteSettings, ast) {

| concreteSettings_, lowLevelAST, backend |

yield concreteSettings, lowLevelAST, backend, index

}

end

# cppSettingsTest(concreteSettings)

# Returns the C++ code used to test if we are in a configuration that

# corresponds to the given concrete settings.

def cppSettingsTest(concreteSettings)

"#if " + concreteSettings.to_a.collect{

| pair |

(if pair[1]

else

"!"

end) + "OFFLINE_ASM_" + pair[0]

}.join(" && ")

end

# isASTErroneous(ast)

# Tests to see if the AST claims that there is an error - i.e. if the

# user's code, after settings resolution, has Error nodes.

def isASTErroneous(ast)

not ast.filter(Error).empty?

end

# assertConfiguration(concreteSettings)

# Emits a check that asserts that we're using the given configuration.

def assertConfiguration(concreteSettings)

$output.puts cppSettingsTest(concreteSettings)

$output.puts "#else"

$output.puts "#error \"Configuration mismatch.\""

$output.puts "#endif"

end

# emitCodeInConfiguration(concreteSettings, ast, backend) {

# | concreteSettings, ast, backend | ... }

# Emits all relevant guards to see if the configuration holds and

# calls the block if the configuration is not erroneous.

def emitCodeInConfiguration(concreteSettings, ast, backend)

Label.resetReferenced

if !$emitWinAsm

$output.puts cppSettingsTest(concreteSettings)

else

if backend == "X86_WIN"

$output.puts ".MODEL FLAT, C"

end

$output.puts "INCLUDE #{File.basename($output.path)}.sym"

$output.puts "_TEXT SEGMENT"

end

if isASTErroneous(ast)

$output.puts "#error \"Invalid configuration.\""

elsif not WORKING_BACKENDS.include? backend

$output.puts "#error \"This backend is not supported yet.\""

else

yield concreteSettings, ast, backend

end

if !$emitWinAsm

$output.puts "#endif"

else

$output.puts "_TEXT ENDS"

$output.puts "END"

# Write symbols needed by MASM

File.open("#{File.basename($output.path)}.sym", "w") {

| outp |

Label.forReferencedExtern {

| name |

outp.puts "EXTERN #{name[1..-1]} : near"

}

end

# emitCodeInAllConfigurations(ast) {

# | concreteSettings, ast, backend, index | ... }

# Emits guard codes for all valid configurations, and calls the block

# for those configurations that are valid and not erroneous.

def emitCodeInAllConfigurations(ast)

forEachValidSettingsCombination(ast) {

| concreteSettings, lowLevelAST, backend, index |

$output.puts cppSettingsTest(concreteSettings)

yield concreteSettings, lowLevelAST, backend, index

$output.puts "#endif"

}

end

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