Class: MilkTea::Build

Inherits:
Object
  • Object
show all
Defined in:
lib/milk_tea/tooling/build.rb

Defined Under Namespace

Classes: FrontendModule, Result, RubyFrontend

Constant Summary collapse

DEFAULT_WASM_SHELL_TEMPLATE_PATH = 
File.expand_path("templates/wasm_shell.html", __dir__).freeze
WASM_SHELL_SCRIPT_PLACEHOLDER = 
"{{{ SCRIPT }}}".freeze
WASM_SHELL_CANVAS_PLACEHOLDER = 
"{{{ MILK_TEA_CANVAS }}}".freeze
WASM_SHELL_OUTPUT_PLACEHOLDER = 
"{{{ MILK_TEA_OUTPUT }}}".freeze
WASM_SHELL_BOOTSTRAP_PLACEHOLDER = 
"{{{ MILK_TEA_BOOTSTRAP }}}".freeze
WASM_SHELL_TEMPLATE = 
File.read(DEFAULT_WASM_SHELL_TEMPLATE_PATH).freeze
WASM_SHELL_CANVAS_TEMPLATE = 
<<~HTML.freeze
  <canvas id="canvas" oncontextmenu="event.preventDefault()" tabindex="-1"></canvas>
HTML
WASM_SHELL_OUTPUT_TEMPLATE = 
<<~HTML.freeze
  <pre id="output"></pre>
HTML
WASM_SHELL_BOOTSTRAP_TEMPLATE = 
<<~HTML.freeze
  <script>
    var Module = {
      print: (function() {
        var element = document.getElementById('output');
        if (element) element.textContent = '';
        return function(text) {
          if (arguments.length > 1) text = Array.prototype.slice.call(arguments).join(' ');
          console.log(text);
          if (element) {
            element.textContent += text + "\\n";
            element.scrollTop = element.scrollHeight;
          }
        };
      })(),
      printErr: (function() {
        var element = document.getElementById('output');
        return function(text) {
          if (arguments.length > 1) text = Array.prototype.slice.call(arguments).join(' ');
          console.error(text);
          if (element) {
            element.textContent += "[err] " + text + "\\n";
            element.scrollTop = element.scrollHeight;
          }
        };
      })(),
      canvas: (function() {
        return document.getElementById('canvas');
      })()
    };
  </script>
HTML

Class Method Summary collapse

Instance Method Summary collapse

Constructor Details

#initialize(path, output_path:, cc:, keep_c_path:, raw_bindings:, module_roots: nil, package_graph: nil, frontend: nil, debug: false, profile: nil, platform: nil, bundle: false, archive: false, no_cache: false, sanitize: false, kind: :executable, debug_guards: nil) ⇒ Build

Returns a new instance of Build.



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# File 'lib/milk_tea/tooling/build.rb', line 130

def initialize(path, output_path:, cc:, keep_c_path:, raw_bindings:, module_roots: nil, package_graph: nil, frontend: nil, debug: false, profile: nil, platform: nil, bundle: false, archive: false, no_cache: false, sanitize: false, kind: :executable, debug_guards: nil)
  @kind = case kind
  when :executable, :static, :shared then kind
  else raise BuildError, "unknown build kind #{kind}; expected executable|static|shared"
  end
  @explicit_output_path = !output_path.nil?
  resolved_source = use_package_build_for?(path)
  if resolved_source
    @package_build = true
    manifest = resolved_source[:manifest]
    @source_path = manifest.source_path
    @project_root = manifest.root_dir
    @package_name = manifest.package_name
    @archive = archive
    @bundle = bundle || archive
    if manifest.package_kind == :library && @kind == :executable
      raise BuildError, "cannot build library package #{manifest.package_name} as an executable"
    end
    unless @source_path
      raise BuildError, "application package #{manifest.package_name} has no build entry; set build.entry or create src/main.mt"
    end
    @profile = normalize_profile(profile || manifest.profile || (debug ? :debug : :debug))
    @platform = normalize_platform(platform || manifest.platform || host_platform)
    @resolved_source_path = ModuleLoader.resolve_source_path(@source_path, platform: @platform, error_class: BuildError)
    validate_bundle_mode!
    @manifest_output_path = manifest.output_path
    if @bundle
      @bundle_root = File.expand_path(output_path || manifest.output_path || default_package_bundle_root)
      @output_path = File.join(@bundle_root, "#{@package_name}#{artifact_extension}")
    else
      @bundle_root = nil
      resolved_output = output_path || manifest.output_path || default_package_output_path
      @output_path = normalize_output_path(File.expand_path(resolved_output))
    end
    @assets_paths = manifest.assets_paths
    @html_template_path = manifest.html_template_path
  else
    @package_build = false
    @source_path = File.expand_path(path)
    @project_root = File.dirname(@source_path)
    @package_name = File.basename(@project_root).tr("-", "_")
    @archive = archive
    @bundle = bundle || archive
    @profile = normalize_profile(profile || (debug ? :debug : :debug))
    @platform = normalize_platform(platform || host_platform)
    @resolved_source_path = ModuleLoader.resolve_source_path(@source_path, platform: @platform, error_class: BuildError)
    validate_bundle_mode!
    @manifest_output_path = nil
    @bundle_root = nil
    @output_path = normalize_output_path(File.expand_path(output_path || default_source_output_path(@source_path)))
    @assets_paths = []
    @html_template_path = nil
  end
  @cc = resolve_compiler(cc)
  @keep_c_path = keep_c_path ? File.expand_path(keep_c_path) : nil
  @raw_bindings = raw_bindings
  @package_graph = package_graph
  @module_roots = (module_roots || @package_graph&.source_roots || MilkTea::ModuleRoots.roots_for_path(@source_path)).dup
  @frontend = frontend || RubyFrontend.new
  @no_cache = no_cache || sanitize
  @sanitize = sanitize
  @debug = debug
  @debug_guards = debug_guards
end

Class Method Details

.build(path, output_path: nil, cc: ENV.fetch("CC", "cc"), keep_c_path: nil, raw_bindings: nil, module_roots: nil, package_graph: nil, frontend: nil, debug: false, profile: nil, platform: nil, bundle: false, archive: false, no_cache: false, sanitize: false, kind: :executable, debug_guards: nil) ⇒ Object 



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# File 'lib/milk_tea/tooling/build.rb', line 73

def self.build(path, output_path: nil, cc: ENV.fetch("CC", "cc"), keep_c_path: nil, raw_bindings: nil, module_roots: nil, package_graph: nil, frontend: nil, debug: false, profile: nil, platform: nil, bundle: false, archive: false, no_cache: false, sanitize: false, kind: :executable, debug_guards: nil)
  raw_bindings ||= default_raw_bindings
  new(path, output_path:, cc:, keep_c_path:, raw_bindings:, module_roots:, package_graph:, frontend:, debug:, profile:, platform:, bundle:, archive:, no_cache:, sanitize:, kind:, debug_guards:).build
end

.clean(path, output_path: nil, profile: nil, platform: nil, bundle: false, archive: false) ⇒ Object 



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# File 'lib/milk_tea/tooling/build.rb', line 78

def self.clean(path, output_path: nil, profile: nil, platform: nil, bundle: false, archive: false)
  new(
    path,
    output_path:,
    cc: ENV.fetch("CC", "cc"),
    keep_c_path: nil,
    raw_bindings: nil,
    module_roots: nil,
    debug: false,
    profile:,
    platform:,
    bundle:,
    archive:
  ).clean
end

.default_raw_bindings(root: MilkTea.root) ⇒ Object 



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# File 'lib/milk_tea/tooling/build.rb', line 124

def self.default_raw_bindings(root: MilkTea.root)
  require_relative "../bindings"

  RawBindings.default_registry(root:)
end

.ensure_program_has_entrypoint!(program, ir_program) ⇒ Object

Raises:



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# File 'lib/milk_tea/tooling/build.rb', line 650

def self.ensure_program_has_entrypoint!(program, ir_program)
  return if ir_program.functions.any?(&:entry_point)
  return if program.is_a?(IR::Program)

  if program.root_analysis.functions.key?("main")
    raise BuildError, "root main is not a valid executable entrypoint; expected `function main() -> int|void`, `function main(argc: int, argv: ptr[cstr]) -> int|void`, `function main(argc: int, argv: ptr[ptr[char]]) -> int|void`, or `function main(args: span[str]) -> int|void`"
  end

  raise BuildError, "no executable entrypoint found; define `main` with one of the supported executable signatures"
end

.frontend_build_artifacts(program, emit_line_directives: false, binary_path: nil, debug_guards: false) ⇒ Object 



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# File 'lib/milk_tea/tooling/build.rb', line 94

def self.frontend_build_artifacts(program, emit_line_directives: false, binary_path: nil, debug_guards: false)
  ir_program = program.is_a?(IR::Program) ? program : Lowering.lower(program)
  ensure_program_has_entrypoint!(program, ir_program)
  compiled_c = CBackend.emit(ir_program, emit_line_directives:, debug_guards:)
  saved_c = emit_line_directives ? nil : compiled_c

  {
    ir_program: ir_program,
    compiled_c: compiled_c,
    saved_c: saved_c,
    debug_map: binary_path ? DebugMap.from_ir(ir_program, binary_path:) : nil,
    modules: frontend_modules(program),
  }
end

.frontend_modules(program) ⇒ Object 



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# File 'lib/milk_tea/tooling/build.rb', line 109

def self.frontend_modules(program)
  return [].freeze if program.is_a?(IR::Program)

  program.analyses_by_module_name.keys.sort.map do |module_name|
    analysis = program.analyses_by_module_name.fetch(module_name)
    FrontendModule.new(
      name: module_name,
      kind: analysis.module_kind,
      link_libraries: analysis.directives.grep(AST::LinkDirective).map(&:value).freeze,
      compiler_flags: analysis.directives.grep(AST::CompilerFlagDirective).map(&:value).freeze,
      uses_parallel_for: analysis.uses_parallel_for,
    )
  end.freeze
end

Instance Method Details

#add_archive_tree(tar, source_path, archive_path) ⇒ Object 



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# File 'lib/milk_tea/tooling/build.rb', line 1017

def add_archive_tree(tar, source_path, archive_path)
  stat = File.lstat(source_path)

  if stat.directory?
    tar.mkdir(archive_path, stat.mode & 0o777)
    Dir.children(source_path).sort.each do |child|
      add_archive_tree(tar, File.join(source_path, child), File.join(archive_path, child))
    end
  elsif stat.file?
    tar.add_file(archive_path, stat.mode & 0o777) do |io|
      File.open(source_path, "rb") do |file|
        IO.copy_stream(file, io)
      end
    end
  end
end

#artifact_extension ⇒ Object 



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# File 'lib/milk_tea/tooling/build.rb', line 1075

def artifact_extension
  return ".html" if target_wasm?
  return ".exe" if target_windows?

  ""
end

#build ⇒ Object 



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# File 'lib/milk_tea/tooling/build.rb', line 230

def build
  Types::Registry.reset!
  ensure_compiler_available!
  ensure_supported_backend!

  return build_static_library if @kind == :static
  return build_shared_library if @kind == :shared

  if @frontend.is_a?(RubyFrontend) && !@no_cache
    build_cached
  else
    build_uncached
  end
end

#build_cached ⇒ Object 



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# File 'lib/milk_tea/tooling/build.rb', line 351

def build_cached
  cache = BuildCache.new(root: MilkTea.root)
  emit_line_directives = line_directives_required?
  @cached = true

  program = load_program_with_cache(cache)

  compiled_c, frontend_modules, debug_map_source = compile_frontend(program, cache, emit_line_directives)

  prepare_bindings(frontend_modules)
  compiler_flags = collect_compiler_flags(frontend_modules)
  link_flags = collect_link_flags(frontend_modules)
  debug_map_path = DebugMap.sidecar_path_for(@output_path)

  FileUtils.mkdir_p(File.dirname(@output_path))

  saved_c = compile_frontend_saved_c(compiled_c, emit_line_directives)

  if @keep_c_path
    saved_c ||= compiled_c unless emit_line_directives
    if emit_line_directives && saved_c.nil?
      saved_c = CBackend.emit(Lowering.lower(program), emit_line_directives: false, debug_guards: false)
    end
    raise BuildError, "frontend did not provide saved C output for --keep-c debug build" if saved_c.nil?

    write_c_file(@keep_c_path, saved_c)
    compile_and_link_cached(compiled_c, compiler_flags, link_flags, cache)
    if debug_map_source
      DebugMap.from_ir(debug_map_source, binary_path: @output_path).write(debug_map_path)
    end
    stage_runtime_assets
    archive_path = write_bundle_archive
    return Result.new(output_path: @output_path, c_path: @keep_c_path, compiler: @cc, link_flags:, profile: @profile, platform: @platform, bundle_root: @bundle_root, archive_path:, cached: @cached)
  end

  compile_and_link_cached(compiled_c, compiler_flags, link_flags, cache)

  if debug_map_source
    debug_map = debug_map_source.is_a?(IR::Program) ? DebugMap.from_ir(debug_map_source, binary_path: @output_path) : debug_map_source
    debug_map.write(debug_map_path)
  end
  stage_runtime_assets
  archive_path = write_bundle_archive

  Result.new(output_path: @output_path, c_path: nil, compiler: @cc, link_flags:, profile: @profile, platform: @platform, bundle_root: @bundle_root, archive_path:, cached: @cached)
end

#build_shared_library ⇒ Object

Raises:



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# File 'lib/milk_tea/tooling/build.rb', line 261

def build_shared_library
  cache = @no_cache ? nil : BuildCache.new(root: MilkTea.root)
  emit_line_directives = line_directives_required?
  _source_files, program, compiled_c, saved_c, frontend_modules, _ir_program = prepare_program(cache:, emit_line_directives:)
  prepare_bindings(frontend_modules)
  compiler_flags = collect_compiler_flags(frontend_modules)
  link_flags = collect_link_flags(frontend_modules)

  object_path = compile_or_cache_object(cache, compiled_c || saved_c, pic: true)
  shared_flags = darwin_target? ? ["-dynamiclib"] : ["-shared"]
  command = [@cc, *shared_flags, "-o", @output_path, object_path, *link_flags, *compiler_flags]
  stdout, stderr, status = Open3.capture3(*command)
  raise BuildError, "shared library link failed:\n#{stdout}#{stderr}" unless status.success?

  generate_header(program) if program
  Result.new(output_path: @output_path, c_path: nil, compiler: @cc, link_flags:, profile: @profile, platform: @platform, bundle_root: nil, archive_path: nil, cached: false)
end

#build_static_library ⇒ Object

Raises:



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# File 'lib/milk_tea/tooling/build.rb', line 245

def build_static_library
  cache = @no_cache ? nil : BuildCache.new(root: MilkTea.root)
  emit_line_directives = line_directives_required?
  _source_files, program, compiled_c, saved_c, frontend_modules, _ir_program = prepare_program(cache:, emit_line_directives:)
  prepare_bindings(frontend_modules)

  object_path = compile_or_cache_object(cache, compiled_c || saved_c)
  archive_path = @output_path
  command = darwin_target? ? ["libtool", "-static", "-o", archive_path, object_path] : ["ar", "rcs", archive_path, object_path]
  stdout, stderr, status = Open3.capture3(*command)
  raise BuildError, "archiver failed:\n#{stdout}#{stderr}" unless status.success?

  generate_header(program) if program
  Result.new(output_path: @output_path, c_path: nil, compiler: @cc, link_flags: [], profile: @profile, platform: @platform, bundle_root: nil, archive_path: nil, cached: false)
end

#build_uncached ⇒ Object 



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# File 'lib/milk_tea/tooling/build.rb', line 398

def build_uncached
  emit_line_directives = line_directives_required?
  artifacts = @frontend.compile(
    path: @resolved_source_path,
    module_roots: @module_roots,
    package_graph: @package_graph,
    platform: @platform,
    emit_line_directives: emit_line_directives,
    binary_path: @output_path,
    debug_guards: debug_guards_enabled?,
  )
  ir_program = artifacts[:ir_program]
  compiled_c = artifacts.fetch(:compiled_c)
  saved_c = artifacts[:saved_c]
  debug_map = artifacts.fetch(:debug_map)
  frontend_modules = artifacts.fetch(:modules)
  prepare_bindings(frontend_modules)
  compiler_flags = collect_compiler_flags(frontend_modules)
  link_flags = collect_link_flags(frontend_modules)
  debug_map_path = DebugMap.sidecar_path_for(@output_path)

  FileUtils.mkdir_p(File.dirname(@output_path))

  if @keep_c_path
    saved_c ||= compiled_c unless emit_line_directives
    saved_c ||= CBackend.emit(ir_program, emit_line_directives: false, debug_guards: false) if emit_line_directives && ir_program
    raise BuildError, "frontend did not provide saved C output for --keep-c debug build" if saved_c.nil?

    write_c_file(@keep_c_path, saved_c)
    if emit_line_directives
      compile_generated_c(compiled_c, compiler_flags, link_flags)
    else
      compile(@keep_c_path, compiler_flags, link_flags)
    end
    debug_map.write(debug_map_path)
    stage_runtime_assets
    archive_path = write_bundle_archive
    return Result.new(output_path: @output_path, c_path: @keep_c_path, compiler: @cc, link_flags:, profile: @profile, platform: @platform, bundle_root: @bundle_root, archive_path:, cached: false)
  end

  compile_generated_c(compiled_c, compiler_flags, link_flags)

  debug_map.write(debug_map_path)
  stage_runtime_assets
  archive_path = write_bundle_archive

  Result.new(output_path: @output_path, c_path: nil, compiler: @cc, link_flags:, profile: @profile, platform: @platform, bundle_root: @bundle_root, archive_path:, cached: false)
end

#bundle_archive_path ⇒ Object 



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# File 'lib/milk_tea/tooling/build.rb', line 1013

def bundle_archive_path
  "#{@bundle_root}.tar.gz"
end

#cache_cache_dir ⇒ Object 



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# File 'lib/milk_tea/tooling/build.rb', line 343

def cache_cache_dir
  File.join(MilkTea.data_root.to_s, "tmp", "mtc-cache")
end

#clean ⇒ Object 



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# File 'lib/milk_tea/tooling/build.rb', line 211

def clean
  target_path = clean_target_path
  if File.directory?(target_path)
    FileUtils.rm_rf(target_path)
  else
    clean_output_artifacts(target_path)
    clean_staged_runtime_assets(target_path)
    FileUtils.rm_f(DebugMap.sidecar_path_for(@output_path))
  end
  clean_bundle_archive
  clean_cache
  target_path
end

#clean_bundle_archive ⇒ Object 



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# File 'lib/milk_tea/tooling/build.rb', line 886

def clean_bundle_archive
  return unless @archive

  FileUtils.rm_f(bundle_archive_path)
end

#clean_cache ⇒ Object 



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# File 'lib/milk_tea/tooling/build.rb', line 225

def clean_cache
  cache_dir = File.join(MilkTea.data_root.to_s, "tmp", "mtc-cache")
  FileUtils.rm_rf(cache_dir) if File.exist?(cache_dir)
end

#clean_output_artifacts(target_path) ⇒ Object 



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# File 'lib/milk_tea/tooling/build.rb', line 876

def clean_output_artifacts(target_path)
  FileUtils.rm_f(target_path)
  return unless target_wasm? && File.extname(target_path) == ".html"

  base_path = target_path.sub(/\.html\z/, "")
  %w[.js .wasm .data .worker.js .symbols .wasm.map].each do |extension|
    FileUtils.rm_f("#{base_path}#{extension}")
  end
end

#clean_staged_runtime_assets(target_path) ⇒ Object 



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# File 'lib/milk_tea/tooling/build.rb', line 892

def clean_staged_runtime_assets(target_path)
  runtime_asset_mappings_for(target_path).each do |_source_path, staged_path|
    FileUtils.rm_rf(staged_path)
  end

  FileUtils.rm_f(runtime_asset_pack_path_for(target_path)) if runtime_assets_packed?
end

#clean_target_path ⇒ Object 



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# File 'lib/milk_tea/tooling/build.rb', line 447

def clean_target_path
  if @package_build && !@explicit_output_path && @manifest_output_path.nil?
    return File.join(@project_root, "build", "dist") if @bundle

    File.join(@project_root, "build")
  elsif @bundle
    @bundle_root
  else
    @output_path
  end
end

#collect_compiler_flags(frontend_modules) ⇒ Object 



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# File 'lib/milk_tea/tooling/build.rb', line 817

def collect_compiler_flags(frontend_modules)
  std_c_include_flag = "-I#{MilkTea.root.join('std/c')}"

  flags = frontend_modules.each_with_object([]) do |mod, result|
    next unless mod.kind == :raw_module

    if mod.name.start_with?("std.c.")
      result << std_c_include_flag unless result.include?(std_c_include_flag)
    end

    mod.compiler_flags.each do |compiler_flag|
      result << compiler_flag unless result.include?(compiler_flag)
    end

    binding = @raw_bindings.find_by_module_name(mod.name)
    next unless binding

    binding.build_flags(platform: @platform).each do |flag|
      result << flag unless result.include?(flag)
    end
  end

  if frontend_modules.any?(&:uses_parallel_for)
    flags << std_c_include_flag unless flags.include?(std_c_include_flag)
    libuv_binding = @raw_bindings.find_by_module_name("std.c.libuv")
    if libuv_binding
      libuv_binding.build_flags(platform: @platform).each do |flag|
        flags << flag unless flags.include?(flag)
      end
    end
  end

  flags
rescue RawBindings::Error => e
  raise BuildError, e.message
end

#collect_link_flags(frontend_modules) ⇒ Object 



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# File 'lib/milk_tea/tooling/build.rb', line 781

def collect_link_flags(frontend_modules)
  flags = frontend_modules.each_with_object([]) do |mod, flags|
    next unless mod.kind == :raw_module

    binding = @raw_bindings.find_by_module_name(mod.name)
    if binding
      binding.link_flags(platform: @platform).grep(/\A-L/).each do |flag|
        flags << flag unless flags.include?(flag)
      end
    end

    mod.link_libraries.each do |link_library|
      flag = "-l#{link_library}"
      flags << flag unless flags.include?(flag)
    end

    if binding
      binding.link_flags(platform: @platform).reject { |flag| flag.start_with?("-L") }.each do |flag|
        flags << flag unless flags.include?(flag)
      end
    end
  end

  if frontend_modules.any?(&:uses_parallel_for) && !flags.include?("-luv")
    libuv_binding = @raw_bindings.find_by_module_name("std.c.libuv")
    if libuv_binding
      libuv_binding.link_flags(platform: @platform).each do |flag|
        flags << flag unless flags.include?(flag)
      end
    end
    flags << "-luv" unless flags.include?("-luv")
  end

  flags
end

#compile(c_path, compiler_flags, link_flags) ⇒ Object 



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# File 'lib/milk_tea/tooling/build.rb', line 854

def compile(c_path, compiler_flags, link_flags)
  return compile_wasm(c_path, compiler_flags, link_flags) if target_wasm?

  profile_flags = profile_compiler_flags
  command = [@cc, "-std=c11", *sanitize_flags, *profile_flags, *compiler_flags, c_path, "-o", @output_path, *link_flags]
  stdout, stderr, status = Open3.capture3(*command)
  return if status.success?

  details = [stdout, stderr].reject(&:empty?).join
  raise BuildError, details.empty? ? "C compiler failed" : "C compiler failed:\n#{details}"
rescue Errno::ENOENT
  raise BuildError, "C compiler not found: #{@cc}"
end

#compile_and_link_cached(compiled_c, compiler_flags, link_flags, cache) ⇒ Object 



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# File 'lib/milk_tea/tooling/build.rb', line 636

def compile_and_link_cached(compiled_c, compiler_flags, link_flags, cache)
  binary_key = cache.binary_key(c_source: compiled_c, cc: @cc, compiler_flags:, link_flags:)
  cached_binary = cache.fetch_binary(binary_key)

  if cached_binary
    FileUtils.cp(cached_binary, @output_path)
    return
  end

  @cached = false
  compile_generated_c(compiled_c, compiler_flags, link_flags)
  cache.store_binary(binary_key, @output_path)
end

#compile_frontend(program, cache, emit_line_directives) ⇒ Object 



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# File 'lib/milk_tea/tooling/build.rb', line 476

def compile_frontend(program, cache, emit_line_directives)
  source_files = program.analyses_by_path.keys.each_with_object({}) do |path, hash|
    hash[path] = File.read(path, mode: "rb")
  end
  key = cache.program_key(source_files: source_files.to_a)

  cached = cache.fetch_program(key)
  if cached
    return [cached.c_source, cached.frontend_modules, nil]
  end

  @cached = false

  method_defs_hash = compute_method_defs_hash(program)
  previous_method_defs = cache.fetch_method_defs
  if previous_method_defs && previous_method_defs != method_defs_hash
    cache.invalidate_all_module_ir
  end

  module_changes = detect_module_changes(program, cache, source_files)
  if module_changes.any? { |_, v| v == :changed }
    changed = module_changes.select { |_, v| v == :changed }.keys
    warn "    #{changed.length} of #{module_changes.length} module(s) changed" if $VERBOSE || ENV["MTC_VERBOSE"]
  end

  rgraph = reverse_import_graph(program)
  changed_names = module_changes.select { |_, v| v == :changed }.map { |k, _| k.to_s }
  invalidated = {}
  changed_names.each { |mod| invalidated[mod] = true }
  changed_names.each do |mod|
    (rgraph[mod] || []).each { |dep| invalidated[dep] = true }
  end

  preload = {}
  preload_synthetics = {}
  module_changes.each do |module_name, status|
    next unless status == :unchanged
    next if invalidated.key?(module_name.to_s)

    path = program.analyses_by_path.keys.find { |p| program.analyses_by_path[p].module_name.to_s == module_name.to_s }
    next unless path

    module_content = source_files[path]
    next unless module_content

    path_key = cache.module_key(path, module_content)
    cached_data = cache.fetch_module_ir(path_key)
    next unless cached_data

    if cached_data.is_a?(Array)
      ir, synths = cached_data
      preload[module_name.to_s] = ir
      preload_synthetics[module_name.to_s] = synths || {}
    end
  end

  ir_program, modules, per_module_synthetics = Lowering.lower_incremental(
    program,
    cached: preload.empty? ? nil : preload,
    cached_synthetics: preload_synthetics.empty? ? nil : preload_synthetics,
  )

  Build.ensure_program_has_entrypoint!(program, ir_program)
  compiled_c = CBackend.emit(ir_program, emit_line_directives:, debug_guards: debug_guards_enabled?)

  frontend_modules = Build.send(:frontend_modules, program)

  cache.store_program(key, c_source: compiled_c, frontend_modules:)

  source_files.each do |path, content|
    analysis = program.analyses_by_path[path]
    next unless analysis
    next if preload.key?(analysis.module_name.to_s)

    path_key = cache.module_key(path, content)
    fragment = modules[analysis.module_name]
    synths = per_module_synthetics[analysis.module_name]
    cache.store_module_ir(path_key, fragment, synthetics: synths) if fragment
  end

  cache.store_method_defs(method_defs_hash)
  update_module_caches(program, cache, source_files)

  [compiled_c, frontend_modules, ir_program]
end

#compile_frontend_saved_c(compiled_c, emit_line_directives) ⇒ Object 



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# File 'lib/milk_tea/tooling/build.rb', line 630

def compile_frontend_saved_c(compiled_c, emit_line_directives)
  return nil if emit_line_directives

  compiled_c
end

#compile_generated_c(source, compiler_flags, link_flags) ⇒ Object 



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# File 'lib/milk_tea/tooling/build.rb', line 753

def compile_generated_c(source, compiler_flags, link_flags)
  Tempfile.create(["milk-tea-build", ".c"]) do |file|
    file.write(source)
    file.flush
    file.close

    compile(file.path, compiler_flags, link_flags)
  end
end

#compile_or_cache_object(cache, source, pic: false) ⇒ Object 



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# File 'lib/milk_tea/tooling/build.rb', line 313

def compile_or_cache_object(cache, source, pic: false)
  return compile_to_object(source, pic:) unless cache

  hasher = Digest::SHA256.new
  hasher << source << "\0"
  hasher << (pic ? "pic" : "nopic") << "\0"
  hasher << @cc << "\0"
  key = hasher.hexdigest

  object_path = File.join(cache_cache_dir, "objects", key[0, 2], key, "object.o")
  return object_path if File.exist?(object_path)

  FileUtils.mkdir_p(File.dirname(object_path))
  compile_to_object_at(source, object_path, pic:)
  object_path
end

#compile_to_object_at(source, output_path, pic: false) ⇒ Object

Raises:



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# File 'lib/milk_tea/tooling/build.rb', line 330

def compile_to_object_at(source, output_path, pic: false)
  c_path = "#{output_path}.c"
  File.write(c_path, source)
  profile_flags = profile_compiler_flags
  pic_flags = pic ? ["-fPIC"] : []
  std_c_include_flag = "-I#{MilkTea.root.join('std/c')}"
  command = [@cc, "-std=c11", "-c", *pic_flags, *profile_flags, std_c_include_flag, c_path, "-o", output_path]
  stdout, stderr, status = Open3.capture3(*command)
  FileUtils.rm_f(c_path)
  raise BuildError, "C compilation failed:\n#{stdout}#{stderr}" unless status.success?
  output_path
end

#compile_wasm(c_path, compiler_flags, link_flags) ⇒ Object 



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# File 'lib/milk_tea/tooling/build.rb', line 900

def compile_wasm(c_path, compiler_flags, link_flags)
  profile_flags = profile_compiler_flags
  preload_flags = wasm_asset_flags
  module_api_flags = ["-sINCOMING_MODULE_JS_API=canvas,print,printErr"]

  with_wasm_shell_file do |shell_path|
    command = [@cc, "-std=c11", *profile_flags, *compiler_flags, c_path, "-o", @output_path, "--shell-file", shell_path, *module_api_flags, *preload_flags, *link_flags]
    stdout, stderr, status = Open3.capture3(*command)
    return if status.success?

    details = [stdout, stderr].reject(&:empty?).join
    raise BuildError, details.empty? ? "C compiler failed" : "C compiler failed:\n#{details}"
  end
rescue Errno::ENOENT
  raise BuildError, "C compiler not found: #{@cc}"
end

#compiler_available?(compiler) ⇒ Boolean

Returns:

  • (Boolean) 


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# File 'lib/milk_tea/tooling/build.rb', line 1098

def compiler_available?(compiler)
  return File.file?(compiler) && File.executable?(compiler) if compiler.include?(File::SEPARATOR)

  ENV.fetch("PATH", "").split(File::PATH_SEPARATOR).any? do |entry|
    candidate = File.join(entry, compiler)
    File.file?(candidate) && File.executable?(candidate)
  end
end

#compiler_command_name(compiler) ⇒ Object 



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# File 'lib/milk_tea/tooling/build.rb', line 1107

def compiler_command_name(compiler)
  File.basename(compiler).downcase.sub(/\.(?:exe|bat|cmd|com|sh|py)\z/, "")
end

#compute_method_defs_hash(program) ⇒ Object 



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# File 'lib/milk_tea/tooling/build.rb', line 575

def compute_method_defs_hash(program)
  hasher = Digest::SHA256.new
  program.analyses_by_path.values.each do |analysis|
    analysis.ast.declarations.grep(AST::ExtendingBlock).each do |block|
      type_name = block.type_name.respond_to?(:name) ? block.type_name.name.parts.join(".") : block.type_name.to_s
      block.methods.each do |method|
        hasher << analysis.module_name.to_s << "\0"
        hasher << type_name << "\0"
        hasher << method.kind.to_s << "\0" << method.name << "\0"
      end
    end
  end
  hasher.hexdigest
end

#darwin_target? ⇒ Boolean

Returns:

  • (Boolean) 


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# File 'lib/milk_tea/tooling/build.rb', line 347

def darwin_target?
  @platform == :darwin || RUBY_PLATFORM =~ /darwin/
end

#debug_guards_enabled? ⇒ Boolean

Returns:

  • (Boolean) 


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# File 'lib/milk_tea/tooling/build.rb', line 1092

def debug_guards_enabled?
  return @debug_guards unless @debug_guards.nil?

  @profile == :debug
end

#default_package_bundle_root ⇒ Object 



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# File 'lib/milk_tea/tooling/build.rb', line 689

def default_package_bundle_root
  File.join(@project_root, "build", "dist", @platform.to_s, @profile.to_s, @package_name)
end

#default_package_output_path ⇒ Object 



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# File 'lib/milk_tea/tooling/build.rb', line 684

def default_package_output_path
  build_root = File.join(@project_root, "build")
  File.join(build_root, "bin", @platform.to_s, @profile.to_s, "#{@package_name}#{artifact_extension}")
end

#default_source_output_path(source_path) ⇒ Object 



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# File 'lib/milk_tea/tooling/build.rb', line 679

def default_source_output_path(source_path)
  base = source_path.sub(/\.mt\z/, "")
  target_wasm? ? "#{base}.html" : base
end

#detect_module_changes(program, cache, source_files) ⇒ Object 



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# File 'lib/milk_tea/tooling/build.rb', line 590

def detect_module_changes(program, cache, source_files)
  changes = {}

  program.analyses_by_path.each do |path, analysis|
    module_name = analysis.module_name.to_s
    content = source_files[path]
    next unless content

    module_key = cache.module_key(path, content)
    state = cache.fetch_module_state(module_key)

    if state.nil? || state[:source_key] != module_key
      changes[module_name] = :changed
    else
      changes[module_name] = :unchanged
    end
  end

  changes
end

#emscripten_backend?(compiler) ⇒ Boolean

Returns:

  • (Boolean) 


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# File 'lib/milk_tea/tooling/build.rb', line 1111

def emscripten_backend?(compiler)
  compiler_command_name(compiler).split(/[-_.]/).include?("emcc")
end

#ensure_compiler_available! ⇒ Object

Raises:



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# File 'lib/milk_tea/tooling/build.rb', line 763

def ensure_compiler_available!
  return if compiler_available?(@cc)

  raise BuildError, "C compiler not found: #{@cc}"
end

#ensure_runtime_assets_do_not_overlap_source!(source_path, staged_path) ⇒ Object

Raises:



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# File 'lib/milk_tea/tooling/build.rb', line 1054

def ensure_runtime_assets_do_not_overlap_source!(source_path, staged_path)
  return unless File.directory?(source_path)
  return unless path_within?(staged_path, source_path)

  raise BuildError, "native runtime asset output would be written inside build.assets source tree: #{staged_path}"
end

#ensure_supported_backend! ⇒ Object

Raises:



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# File 'lib/milk_tea/tooling/build.rb', line 769

def ensure_supported_backend!
  if target_wasm?
    return if emscripten_backend?(@cc)

    raise BuildError, "unsupported C compiler backend for wasm target: #{@cc}; use Emscripten emcc"
  end

  return unless msvc_style_backend?(@cc)

  raise BuildError, "unsupported C compiler backend for native target: #{@cc}; use a clang/gcc-style compiler driver instead of cl.exe or clang-cl"
end

#host_platform ⇒ Object 



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# File 'lib/milk_tea/tooling/build.rb', line 872

def host_platform
  MilkTea.host_platform
end

#line_directives_required? ⇒ Boolean

Returns:

  • (Boolean) 


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# File 'lib/milk_tea/tooling/build.rb', line 1088

def line_directives_required?
  @debug || @profile == :debug
end

#load_program_with_cache(cache) ⇒ Object 



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# File 'lib/milk_tea/tooling/build.rb', line 466

def load_program_with_cache(cache)
  loader = ModuleLoader.new(
    module_roots: @module_roots,
    package_graph: @package_graph,
    shared_cache: cache.shared_analysis_cache,
    platform: @platform,
  )
  loader.check_program(@resolved_source_path)
end

#load_wasm_shell_template_source ⇒ Object 



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# File 'lib/milk_tea/tooling/build.rb', line 939

def load_wasm_shell_template_source
  return WASM_SHELL_TEMPLATE.dup unless @html_template_path

  File.read(@html_template_path)
end

#msvc_style_backend?(compiler) ⇒ Boolean

Returns:

  • (Boolean) 


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# File 'lib/milk_tea/tooling/build.rb', line 1115

def msvc_style_backend?(compiler)
  tokens = compiler_command_name(compiler).split(/[-_.]/)
  tokens.last == "cl" || tokens.last(2) == %w[clang cl]
end

#normalize_output_path(path) ⇒ Object

Raises:



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# File 'lib/milk_tea/tooling/build.rb', line 719

def normalize_output_path(path)
  return path unless target_wasm?

  extension = File.extname(path)
  return "#{path}.html" if extension.empty?
  return path if extension == ".html"

  raise BuildError, "wasm output path must end with .html or omit the extension: #{path}"
end

#normalize_platform(value) ⇒ Object 



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# File 'lib/milk_tea/tooling/build.rb', line 704

def normalize_platform(value)
  case value.to_s
  when "", "linux"
    :linux
  when "windows", "win", "win32"
    :windows
  when "wasm", "web", "html5", "browser"
    :wasm
  when "darwin", "macos", "osx"
    :darwin
  else
    raise BuildError, "unknown platform #{value}; expected linux|windows|wasm|darwin"
  end
end

#normalize_profile(value) ⇒ Object 



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# File 'lib/milk_tea/tooling/build.rb', line 693

def normalize_profile(value)
  case value.to_s
  when "", "debug", "dev"
    :debug
  when "release", "rel"
    :release
  else
    raise BuildError, "unknown profile #{value}; expected debug|release"
  end
end

#package_manifest_required_for?(path) ⇒ Boolean

Returns:

  • (Boolean) 


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# File 'lib/milk_tea/tooling/build.rb', line 661

def package_manifest_required_for?(path)
  expanded_path = File.expand_path(path)
  return true if File.directory?(expanded_path)
  return true if File.basename(expanded_path) == "package.toml"

  current = File.dirname(expanded_path)
  loop do
    return true if File.file?(File.join(current, "package.toml"))

    parent = File.dirname(current)
    break if parent == current

    current = parent
  end

  false
end

#path_within?(path, root) ⇒ Boolean

Returns:

  • (Boolean) 


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# File 'lib/milk_tea/tooling/build.rb', line 1061

def path_within?(path, root)
  normalized_path = File.expand_path(path)
  normalized_root = File.expand_path(root)
  normalized_path == normalized_root || normalized_path.start_with?(normalized_root + File::SEPARATOR)
end

#prepare_bindings(frontend_modules) ⇒ Object 



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# File 'lib/milk_tea/tooling/build.rb', line 735

def prepare_bindings(frontend_modules)
  frontend_modules.each do |mod|
    next unless mod.kind == :raw_module

    binding = @raw_bindings.find_by_module_name(mod.name)
    next unless binding

    binding.prepare!(cc: @cc, platform: @platform)
  end
rescue RawBindings::Error => e
  raise BuildError, e.message
end

#prepare_program(cache:, emit_line_directives:) ⇒ Object 



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# File 'lib/milk_tea/tooling/build.rb', line 279

def prepare_program(cache:, emit_line_directives:)
  loader = ModuleLoader.new(
    module_roots: @module_roots,
    package_graph: @package_graph,
    shared_cache: cache&.shared_analysis_cache,
    platform: @platform,
  )
  program = loader.check_program(@resolved_source_path)

  # Check program-level cache for C source
  source_files = program.analyses_by_path.keys.each_with_object({}) { |p, h| h[p] = File.read(p, mode: "rb") }
  if cache
    key = cache.program_key(source_files: source_files.to_a)
    cached = cache.fetch_program(key)
    if cached
      frontend_modules = cached.frontend_modules
      return [source_files, program, cached.c_source, cached.c_source, frontend_modules, nil]
    end
  end

  ir_program = Lowering.lower(program)
  dbg = debug_guards_enabled?
  saved_c = CBackend.emit(ir_program, emit_line_directives: false, debug_guards: dbg)
  compiled_c = emit_line_directives ? CBackend.emit(ir_program, emit_line_directives: true, debug_guards: dbg) : saved_c

  frontend_modules = Build.send(:frontend_modules, program)

  if cache
    cache.store_program(key, c_source: compiled_c, frontend_modules:)
  end

  [source_files, program, compiled_c, saved_c, frontend_modules, ir_program]
end

#profile_compiler_flags ⇒ Object 



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# File 'lib/milk_tea/tooling/build.rb', line 1082

def profile_compiler_flags
  return ["-g", "-O0"] if @debug || @profile == :debug

  ["-O3", "-DNDEBUG"]
end

#render_wasm_shell_template ⇒ Object 



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# File 'lib/milk_tea/tooling/build.rb', line 926

def render_wasm_shell_template
  template_source = load_wasm_shell_template_source
  validate_wasm_shell_placeholder!(template_source, WASM_SHELL_SCRIPT_PLACEHOLDER, "Emscripten {{{ SCRIPT }}}")
  validate_wasm_shell_placeholder!(template_source, WASM_SHELL_CANVAS_PLACEHOLDER, "Milk Tea {{{ MILK_TEA_CANVAS }}}")
  validate_wasm_shell_placeholder!(template_source, WASM_SHELL_OUTPUT_PLACEHOLDER, "Milk Tea {{{ MILK_TEA_OUTPUT }}}")
  validate_wasm_shell_placeholder!(template_source, WASM_SHELL_BOOTSTRAP_PLACEHOLDER, "Milk Tea {{{ MILK_TEA_BOOTSTRAP }}}")

  template_source
    .sub(WASM_SHELL_CANVAS_PLACEHOLDER, WASM_SHELL_CANVAS_TEMPLATE)
    .sub(WASM_SHELL_OUTPUT_PLACEHOLDER, WASM_SHELL_OUTPUT_TEMPLATE)
    .sub(WASM_SHELL_BOOTSTRAP_PLACEHOLDER, WASM_SHELL_BOOTSTRAP_TEMPLATE)
end

#resolve_compiler(requested_cc) ⇒ Object 



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# File 'lib/milk_tea/tooling/build.rb', line 729

def resolve_compiler(requested_cc)
  return ENV.fetch("EMCC", "emcc") if target_wasm? && requested_cc == ENV.fetch("CC", "cc")

  requested_cc
end

#reverse_import_graph(program) ⇒ Object 



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# File 'lib/milk_tea/tooling/build.rb', line 562

def reverse_import_graph(program)
  graph = Hash.new { |h, k| h[k] = [] }
  program.analyses_by_path.each do |path, analysis|
    module_name = analysis.module_name.to_s
    ast_imports = analysis.ast.respond_to?(:imports) ? analysis.ast.imports : []
    ast_imports.each do |import|
      imported_name = import.path.to_s
      graph[imported_name] << module_name
    end
  end
  graph
end

#runtime_asset_mappings_for(target_path) ⇒ Object 



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# File 'lib/milk_tea/tooling/build.rb', line 1034

def runtime_asset_mappings_for(target_path)
  return [] if @assets_paths.empty?
  return [] if target_wasm?

  @assets_paths.filter_map do |assets_path|
    staged_path = File.join(File.dirname(target_path), File.basename(assets_path))
    next if staged_path == assets_path

    [assets_path, staged_path]
  end
end

#runtime_asset_pack_path_for(target_path) ⇒ Object 



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# File 'lib/milk_tea/tooling/build.rb', line 1050

def runtime_asset_pack_path_for(target_path)
  File.join(File.dirname(target_path), "assets.mtpack")
end

#runtime_assets_packed? ⇒ Boolean

Returns:

  • (Boolean) 


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# File 'lib/milk_tea/tooling/build.rb', line 1046

def runtime_assets_packed?
  @bundle && !target_wasm? && !@assets_paths.empty?
end

#sanitize_flags ⇒ Object 



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# File 'lib/milk_tea/tooling/build.rb', line 868

def sanitize_flags
  @sanitize ? %w[-fsanitize=address,undefined -fno-sanitize-recover=all -fno-omit-frame-pointer] : []
end

#stage_runtime_assets ⇒ Object 



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# File 'lib/milk_tea/tooling/build.rb', line 962

def stage_runtime_assets
  if runtime_assets_packed?
    runtime_asset_mappings_for(@output_path).each do |_source_path, staged_path|
      FileUtils.rm_rf(staged_path)
    end

    begin
      AssetPack.write(runtime_asset_pack_path_for(@output_path), @assets_paths)
    rescue AssetPackError => e
      raise BuildError, e.message
    end

    return
  end

  runtime_asset_mappings_for(@output_path).each do |source_path, staged_path|
    ensure_runtime_assets_do_not_overlap_source!(source_path, staged_path)
    FileUtils.rm_rf(staged_path)
    FileUtils.mkdir_p(File.dirname(staged_path))

    if File.directory?(source_path)
      FileUtils.cp_r(source_path, File.dirname(staged_path))
    else
      FileUtils.cp(source_path, File.dirname(staged_path))
    end
  end
end

#target_wasm? ⇒ Boolean

Returns:

  • (Boolean) 


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# File 'lib/milk_tea/tooling/build.rb', line 1071

def target_wasm?
  @platform == :wasm
end

#target_windows? ⇒ Boolean

Returns:

  • (Boolean) 


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# File 'lib/milk_tea/tooling/build.rb', line 1067

def target_windows?
  @platform == :windows
end

#update_module_caches(program, cache, source_files) ⇒ Object 



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# File 'lib/milk_tea/tooling/build.rb', line 611

def update_module_caches(program, cache, source_files)
  program.analyses_by_path.each do |path, analysis|
    content = source_files[path]
    next unless content

    module_name = analysis.module_name.to_s
    module_key = cache.module_key(path, content)
    ast_imports = analysis.ast.respond_to?(:imports) ? analysis.ast.imports : []
    deps = ast_imports.map { |import| import.path.to_s }

    cache.store_module_state(
      module_key,
      module_name: module_name,
      source_key: module_key,
      dependencies: deps,
    )
  end
end

#use_package_build_for?(path) ⇒ Boolean

Returns:

  • (Boolean) 


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# File 'lib/milk_tea/tooling/build.rb', line 195

def use_package_build_for?(path)
  manifest = PackageManifest.load(path)
  return nil unless manifest&.source_path

  manifest_source = File.expand_path(manifest.source_path, manifest.root_dir)
  given_source = File.expand_path(path)
  return nil unless manifest_source == given_source || File.directory?(path)

  { manifest: }
rescue PackageManifestError => e
  if PackageManifest.manifest_exists_for?(path)
    raise BuildError, e.message
  end
  nil
end

#validate_bundle_mode! ⇒ Object

Raises:



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# File 'lib/milk_tea/tooling/build.rb', line 459

def validate_bundle_mode!
  return unless @bundle

  raise BuildError, "bundle mode requires a package build" unless @package_build
  raise BuildError, "bundle mode is supported only for native package builds" if target_wasm?
end

#validate_wasm_shell_placeholder!(template_source, placeholder, label) ⇒ Object

Raises:



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# File 'lib/milk_tea/tooling/build.rb', line 945

def validate_wasm_shell_placeholder!(template_source, placeholder, label)
  count = template_source.scan(Regexp.new(Regexp.escape(placeholder))).length
  return if count == 1

  template_path = @html_template_path || DEFAULT_WASM_SHELL_TEMPLATE_PATH
  raise BuildError, "wasm HTML template must contain #{label} exactly once: #{template_path}"
end

#wasm_asset_flags ⇒ Object 



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# File 'lib/milk_tea/tooling/build.rb', line 953

def wasm_asset_flags
  return [] unless target_wasm? && !@assets_paths.empty?

  @assets_paths.flat_map do |assets_path|
    mount_path = "/#{File.basename(assets_path)}"
    ["--preload-file", "#{assets_path}@#{mount_path}"]
  end
end

#with_wasm_shell_file ⇒ Object 



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# File 'lib/milk_tea/tooling/build.rb', line 917

def with_wasm_shell_file
  Tempfile.create(["milk-tea-shell", ".html"]) do |file|
    file.write(render_wasm_shell_template)
    file.flush
    file.close
    yield file.path
  end
end

#write_bundle_archive ⇒ Object 



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# File 'lib/milk_tea/tooling/build.rb', line 990

def write_bundle_archive
  return nil unless @archive

  archive_path = bundle_archive_path
  FileUtils.rm_f(archive_path)
  FileUtils.mkdir_p(File.dirname(archive_path))

  Tempfile.create(["milk-tea-bundle", ".tar"]) do |tar_file|
    Gem::Package::TarWriter.new(tar_file) do |tar|
      add_archive_tree(tar, @bundle_root, File.basename(@bundle_root))
    end

    tar_file.flush
    tar_file.rewind

    Zlib::GzipWriter.open(archive_path) do |gzip|
      IO.copy_stream(tar_file, gzip)
    end
  end

  archive_path
end

#write_c_file(path, source) ⇒ Object 



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# File 'lib/milk_tea/tooling/build.rb', line 748

def write_c_file(path, source)
  FileUtils.mkdir_p(File.dirname(path))
  File.write(path, source)
end