Handle Duff's device and other unstructured switch
statements
#459
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This PR introduces a new (unverified) elaboration pass, SwitchNorm, that recognizes structured
switch
statements and puts them in a normalized form. If selected (language support option-funstructured-switch
), otherswitch
statements are turned into a structured switch withgoto
actions, followed by the originalswitch
body with appropriate labels andgoto
.For example, Duff's infamous code
becomes
Other examples can be found in test/regression/switch3.c.