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When executing an
Unreachable
instruction, the VM unconditionallyexits with an error of the L0 language.
The opcode is added for the convenience of the code generator / higher-
level passes: a procedure ending in an
Unreachable
statement now nolonger requires an (unnecessary) exit continuation in order to result
in well-formed bytecode.
While
pass0
could relatively easily insert aRet
instruction tomake the bytecode well-formed, the dedicated instruction has the
benefit that it aborts execution.
Notes For Reviewers
Unreachable
for the source language