69 lines
2.1 KiB
Ruby
69 lines
2.1 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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@@counter = 0 #naming the braches by counting mainly to get them back together in testing
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def compile frame , method
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is = cond.compile(frame , method)
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# is.is_false(frame,method)
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# TODO should/will use different branches for different conditions.
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branch_name = "if_merge_#{@@counter}".to_sym
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@@counter += 1
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branch = Virtual::ImplicitBranch.new branch_name
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method.add branch
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last = is
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if_true.each do |part|
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last = part.compile(frame,method )
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raise part.inspect if last.nil?
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end
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merge = Virtual::Label.new(branch_name)
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method.add merge
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branch.swap
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method.current = branch
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if_false.each do |part|
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last = part.compile(frame,method )
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raise part.inspect if last.nil?
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end
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method.add merge
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branch.swap
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method.current = merge
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#TODO should return the union of the true and false types
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last
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end
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def old
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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? Virtual::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 |