class SyntaxTree::YARV::BranchIf

### Summary

‘branchif` has one argument: the jump index. It pops one value off the stack: the jump condition.

If the value popped off the stack is true, ‘branchif` jumps to the jump index and continues executing there.

### Usage

~~~ruby x = true x ||= “foo” puts x ~~~

Source

# File lib/syntax_tree/yarv/instructions.rb, line 178
def initialize(label)
  @label = label
end

Source

# File lib/syntax_tree/yarv/instructions.rb, line 194
def ==(other)
  other.is_a?(BranchIf) && other.label == label
end

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# File lib/syntax_tree/yarv/instructions.rb, line 210
def branch_targets
  [label]
end

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# File lib/syntax_tree/yarv/instructions.rb, line 206
def call(vm)
  vm.jump(label) if vm.pop
end

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# File lib/syntax_tree/yarv/instructions.rb, line 190
def deconstruct_keys(_keys)
  { label: label }
end

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# File lib/syntax_tree/yarv/instructions.rb, line 182
def disasm(fmt)
  fmt.instruction("branchif", [fmt.label(label)])
end

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# File lib/syntax_tree/yarv/instructions.rb, line 214
def falls_through?
  true
end

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# File lib/syntax_tree/yarv/instructions.rb, line 198
def length
  2
end

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# File lib/syntax_tree/yarv/instructions.rb, line 202
def pops
  1
end

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# File lib/syntax_tree/yarv/instructions.rb, line 186
def to_a(_iseq)
  [:branchif, label.name]
end