vm: add Unreachable opcode
#34
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When executing an `Unreachable` instruction, the VM unconditionally exits 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 no longer requires an (unnecessary) exit continuation in order to result in well- formed bytecode.
saem
approved these changes
Sep 13, 2024
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When executing an
Unreachableinstruction, 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
Unreachablestatement now nolonger requires an (unnecessary) exit continuation in order to result
in well-formed bytecode.
While
pass0could relatively easily insert aRetinstruction tomake the bytecode well-formed, the dedicated instruction has the
benefit that it aborts execution.
Notes For Reviewers
Unreachablefor the source language