36 lines
1.0 KiB
Ruby
36 lines
1.0 KiB
Ruby
module Soml
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Compiler.class_eval do
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# an if evaluates the condition and jumps to the true block if true
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# so the else block is automatically after that.
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# But then the else needs to jump over the true block unconditionally.
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def on_if_statement statement
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branch_type , condition , if_true , if_false = *statement
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condition = condition.first
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reset_regs
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process(condition)
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branch_class = Object.const_get "Register::Is#{branch_type.capitalize}"
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true_block = Register::Label.new(if_true, "if_true")
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add_code branch_class.new( condition , true_block )
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# compile the false block
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reset_regs
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process_all(if_false) if if_false
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merge = Register::Label.new(statement , "if_merge")
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add_code Register::Branch.new(if_false, merge )
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# compile the true block
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add_code true_block
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reset_regs
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process_all(if_true)
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#puts "compiled if: end"
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add_code merge
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nil # statements don't return anything
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end
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end
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end
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