Class: CodeTools::Generator::BasicBlock
- Inherits:
-
Object
- Object
- CodeTools::Generator::BasicBlock
- Defined in:
- lib/rubinius/code/compiler/generator.rb
Constant Summary collapse
- SEPARATOR_SIZE =
40
Instance Attribute Summary collapse
-
#left ⇒ Object
Returns the value of attribute left.
-
#right ⇒ Object
Returns the value of attribute right.
Instance Method Summary collapse
- #add_stack(read, write) ⇒ Object
- #check_stack(stack_size) ⇒ Object
- #close(record_exit = false) ⇒ Object
- #flow_stack_size(stack) ⇒ Object
-
#initialize(generator) ⇒ BasicBlock
constructor
A new instance of BasicBlock.
- #invalid(message) ⇒ Object
- #location(ip = nil) ⇒ Object
- #open ⇒ Object
- #validate_stack ⇒ Object
- #visited? ⇒ Boolean
Constructor Details
#initialize(generator) ⇒ BasicBlock
Returns a new instance of BasicBlock.
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# File 'lib/rubinius/code/compiler/generator.rb', line 80 def initialize(generator) @generator = generator @ip = generator.ip @enter_size = nil @max_size = 0 @min_size = 0 @exit_ip = 0 @exit_size = nil @stack = 0 @left = nil @right = nil @visited = false @closed = false end |
Instance Attribute Details
#left ⇒ Object
Returns the value of attribute left.
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# File 'lib/rubinius/code/compiler/generator.rb', line 77 def left @left end |
#right ⇒ Object
Returns the value of attribute right.
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# File 'lib/rubinius/code/compiler/generator.rb', line 78 def right @right end |
Instance Method Details
#add_stack(read, write) ⇒ Object
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# File 'lib/rubinius/code/compiler/generator.rb', line 95 def add_stack(read, write) read_change = @stack - read @min_size = read_change if read_change < @min_size @stack += (write - read) @max_size = @stack if @stack > @max_size end |
#check_stack(stack_size) ⇒ Object
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# File 'lib/rubinius/code/compiler/generator.rb', line 230 def check_stack(stack_size) if @enter_size unless stack_size == @enter_size invalid "unbalanced stack at #{location}: #{stack_size} != #{@enter_size}" end else if not @closed invalid "control fails to exit properly at #{location}" end @enter_size = stack_size end end |
#close(record_exit = false) ⇒ Object
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# File 'lib/rubinius/code/compiler/generator.rb', line 108 def close(record_exit=false) @closed = true if record_exit @exit_size = @stack @exit_ip = @generator.ip - 1 end end |
#flow_stack_size(stack) ⇒ Object
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# File 'lib/rubinius/code/compiler/generator.rb', line 198 def flow_stack_size(stack) unless @visited @visited = true @generator.accumulate_stack(@enter_size + @max_size) net_size = @enter_size + @stack if net_size < 0 invalid "net stack underflow in block starting at #{location}" end if @enter_size + @min_size < 0 invalid "minimum stack underflow in block starting at #{location}" end if @exit_size and @enter_size + @exit_size < 1 invalid "exit stack underflow in block starting at #{location(@exit_ip)}" end if @left @left.check_stack net_size stack.push @left unless @left.visited? end if @right @right.check_stack net_size stack.push @right unless @right.visited? end end end |
#invalid(message) ⇒ Object
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# File 'lib/rubinius/code/compiler/generator.rb', line 125 def invalid() puts name = @generator.name.inspect size = (SEPARATOR_SIZE - name.size - 2) / 2 size = 1 if size <= 0 puts "\n#{"=" * size} #{name} #{"=" * (size + name.size % 2)}" literals = @generator.literals names = @generator.local_names stream = @generator.stream i = 0 n = stream.size stack = 0 while i < n insn = Rubinius::InstructionSet[stream[i]] printf "[%3d] %04d %-28s" % [stack, i, insn.opcode.inspect] args = stream[i+1, insn.size-1] if insn.size > 1 insn.args.each_with_index do |kind, index| arg = args[index] case kind when :literal printf "%s " % literals[arg].inspect when :local printf "%s " % (names ? names[arg] : arg) else printf "%d " % arg end end end puts if insn.variable_stack? use = insn.stack_consumed if use.kind_of? Array use = args[use[1] - 1] + use[0] end pro = insn.stack_produced if pro.kind_of? Array pro = (args[pro[1] - 1] * pro[2]) + pro[0] end stack += pro - use else stack += insn.stack_difference end i += insn.size end puts "-" * SEPARATOR_SIZE raise CompileError, end |
#location(ip = nil) ⇒ Object
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# File 'lib/rubinius/code/compiler/generator.rb', line 117 def location(ip=nil) ip ||= @ip line = @generator.ip_to_line(ip) "#{@generator.name}: line: #{line}, IP: #{ip}" end |
#open ⇒ Object
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# File 'lib/rubinius/code/compiler/generator.rb', line 104 def open @ip = @generator.ip end |
#validate_stack ⇒ Object
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# File 'lib/rubinius/code/compiler/generator.rb', line 188 def validate_stack @enter_size = 0 stack = [self] until stack.empty? bb = stack.shift bb.flow_stack_size stack end end |
#visited? ⇒ Boolean
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# File 'lib/rubinius/code/compiler/generator.rb', line 184 def visited? @visited end |