Class: ChildProcess::Tools::Generator
- Inherits:
-
Object
- Object
- ChildProcess::Tools::Generator
- Defined in:
- lib/childprocess/tools/generator.rb
Constant Summary collapse
- EXE_NAME =
"childprocess-sizeof-generator"
- TMP_PROGRAM =
"childprocess-sizeof-generator.c"
- DEFAULT_INCLUDES =
%w[stdio.h stddef.h]
Class Method Summary collapse
Instance Method Summary collapse
- #execute(src, opts) ⇒ Object
- #fetch_constant(name, opts) ⇒ Object
- #fetch_size(type_name, opts = {}) ⇒ Object
- #generate ⇒ Object
-
#initialize ⇒ Generator
constructor
A new instance of Generator.
- #result ⇒ Object
- #write ⇒ Object
Constructor Details
#initialize ⇒ Generator
Returns a new instance of Generator.
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# File 'lib/childprocess/tools/generator.rb', line 14 def initialize @cc = ENV['CC'] || 'gcc' @out = File.("../../unix/platform/#{ChildProcess.platform_name}.rb", __FILE__) @sizeof = {} @constants = {} end |
Class Method Details
.generate ⇒ Object
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# File 'lib/childprocess/tools/generator.rb', line 10 def self.generate new.generate end |
Instance Method Details
#execute(src, opts) ⇒ Object
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# File 'lib/childprocess/tools/generator.rb', line 85 def execute(src, opts) program = Array(opts[:define]).map do |key, value| <<-SRC #ifndef #{key} #define #{key} #{value} #endif SRC end.join("\n") program << "\n" includes = Array(opts[:include]) + DEFAULT_INCLUDES program << includes.map { |include| "#include <#{include}>" }.join("\n") program << "\n#{src}" File.open(TMP_PROGRAM, 'w') do |file| file << program end cmd = "#{@cc} #{TMP_PROGRAM} -o #{EXE_NAME}" system cmd unless $?.success? raise "failed to compile program: #{cmd.inspect}\n#{program}" end output = `./#{EXE_NAME} 2>&1` unless $?.success? raise "failed to run program: #{cmd.inspect}\n#{output}" end output.chomp ensure File.delete TMP_PROGRAM if File.exist?(TMP_PROGRAM) File.delete EXE_NAME if File.exist?(EXE_NAME) end |
#fetch_constant(name, opts) ⇒ Object
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# File 'lib/childprocess/tools/generator.rb', line 68 def fetch_constant(name, opts) print "#{name}: " src = <<-EOF int main() { printf("%d", (unsigned int)#{name}); return 0; } EOF output = execute(src, opts) value = Integer(output) @constants[name] = value puts value end |
#fetch_size(type_name, opts = {}) ⇒ Object
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# File 'lib/childprocess/tools/generator.rb', line 47 def fetch_size(type_name, opts = {}) print "sizeof(#{type_name}): " src = <<-EOF int main() { printf("%d", (unsigned int)sizeof(#{type_name})); return 0; } EOF output = execute(src, opts) if output.to_i < 1 raise "sizeof(#{type_name}) == #{output.to_i} (output=#{output})" end size = output.to_i @sizeof[type_name] = size puts size end |
#generate ⇒ Object
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# File 'lib/childprocess/tools/generator.rb', line 21 def generate fetch_size 'posix_spawn_file_actions_t', :include => "spawn.h" fetch_size 'posix_spawnattr_t', :include => "spawn.h" fetch_size 'sigset_t', :include => "signal.h" fetch_constant 'POSIX_SPAWN_RESETIDS', :include => 'spawn.h' fetch_constant 'POSIX_SPAWN_SETPGROUP', :include => 'spawn.h' fetch_constant 'POSIX_SPAWN_SETSIGDEF', :include => 'spawn.h' fetch_constant 'POSIX_SPAWN_SETSIGMASK', :include => 'spawn.h' if ChildProcess.linux? fetch_constant 'POSIX_SPAWN_USEVFORK', :include => 'spawn.h', :define => {'_GNU_SOURCE' => nil} end write end |
#result ⇒ Object
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# File 'lib/childprocess/tools/generator.rb', line 121 def result if @sizeof.empty? && @constants.empty? raise "no data collected, nothing to do" end out = ['module ChildProcess::Unix::Platform'] out << ' SIZEOF = {' max = @sizeof.keys.map { |e| e.length }.max @sizeof.each_with_index do |(type, size), idx| out << " :#{type.ljust max} => #{size}#{',' unless idx == @sizeof.size - 1}" end out << ' }' max = @constants.keys.map { |e| e.length }.max @constants.each do |name, val| out << " #{name.ljust max} = #{val}" end out << 'end' out.join "\n" end |
#write ⇒ Object
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# File 'lib/childprocess/tools/generator.rb', line 38 def write FileUtils.mkdir_p(File.dirname(@out)) File.open(@out, 'w') do |io| io.puts result end puts "wrote #{@out}" end |