41 lines
1.2 KiB
Ruby
41 lines
1.2 KiB
Ruby
module Ast
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class IfExpression < Expression
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# attr_reader :cond, :if_true, :if_false
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def compile context
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f = context.function
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# to execute the logic as the if states it, the blocks are the other way around
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# so we can the jump over the else if true ,and the else joins unconditionally after the true_block
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merge_block = f.new_block "if_merge"
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true_block = f.new_block "if_true"
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false_block = f.new_block "if_false"
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puts "compiling if condition #{cond}"
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cond_val = cond.compile(context)
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unless cond_val.is_a? Vm::BranchCondition
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cond_val = cond_val.is_true? f
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end
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f.b true_block , condition_code: cond_val.operator
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f.insertion_point.branch = true_block
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f.insert_at false_block
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if_false.each do |part|
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puts "compiling in if false #{part}"
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last = part.compile(context )
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end
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f.b merge_block
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f.insertion_point.branch = false_block
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f.insert_at true_block
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last = nil
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if_true.each do |part|
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puts "compiling in if true #{part}"
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last = part.compile(context )
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end
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puts "compiled if: end"
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f.insert_at merge_block
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return last
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end
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end
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end |