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These aren't particularly useful without side effects, but one step at
a time.
This diverges slightly from the book, in that OpPop retains the last
value it "forgot" from the stack in a special field on the
interpreter.
This makes it possible to return values from expression statements,
which helps in cases where Lox is embedded as a scripting
language (please don't do this ever) or in tests.
Change-Id: Ided0bc04c6e80ddb23ba4693d61ac9e08b002d58
Reviewed-on: https://cl.tvl.fyi/c/depot/+/2584
Reviewed-by: tazjin <mail@tazj.in>
Tested-by: BuildkiteCI
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Change-Id: I6c60934d57170157d877e71cc87a97ab773342b5
Reviewed-on: https://cl.tvl.fyi/c/depot/+/2581
Reviewed-by: tazjin <mail@tazj.in>
Tested-by: BuildkiteCI
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Change-Id: I03b751db52a3bd502fb4fbda6e89cad087ccad74
Reviewed-on: https://cl.tvl.fyi/c/depot/+/2575
Reviewed-by: tazjin <mail@tazj.in>
Tested-by: BuildkiteCI
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Change-Id: I5587a11646e228c5af4dc7ca6da026bb4a2592a6
Reviewed-on: https://cl.tvl.fyi/c/depot/+/2574
Reviewed-by: tazjin <mail@tazj.in>
Tested-by: BuildkiteCI
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Change-Id: I9a5bd3581d4ed05371651697ec496341eb7971ae
Reviewed-on: https://cl.tvl.fyi/c/depot/+/2572
Reviewed-by: tazjin <mail@tazj.in>
Tested-by: BuildkiteCI
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Adds support for true, false & nil. These each come with a new
separate opcode and are pushed directly on the stack.
Change-Id: I405b5b09496dcf99d514d3411c083e0834377167
Reviewed-on: https://cl.tvl.fyi/c/depot/+/2571
Reviewed-by: tazjin <mail@tazj.in>
Tested-by: BuildkiteCI
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Introduces a new enum which represents the different types of possible
values, and modifies the rest of the existing code to wrap/unwrap
these enum variants correctly.
Notably in the vm module, a new macro has been introduced that makes
it possible to encode a type expectation and return a runtime error in
case of a type mismatch.
Change-Id: I325b5e31e395c62d8819ab2af6d398e1277333c0
Reviewed-on: https://cl.tvl.fyi/c/depot/+/2570
Reviewed-by: tazjin <mail@tazj.in>
Tested-by: BuildkiteCI
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If I was adding any dependencies, this might be a good one for a
property-based test thing, but I'm not going to.
Change-Id: Ia801d041479d1a88c59ef9e0fe1460b3640382e3
Reviewed-on: https://cl.tvl.fyi/c/depot/+/2569
Reviewed-by: tazjin <mail@tazj.in>
Tested-by: BuildkiteCI
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