feat(interface-types) New numbers and strings instructions #1329
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Basically the `x-to-y` instructions have been renamed `y.from_x`. This patch updates the instruction. The binary representation isn't specified yet, so it's just arbitrary values.
Hywan
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🎉 enhancement
…ructions. The `string.lift_memory` instruction replaces `memory-to-string`, and `string.lower_memory` replaces `string-to-memory`.
This method allows to peek the last item on the stack (if any) by reference.
Hywan
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10 tasks
MarkMcCaskey
approved these changes
Mar 24, 2020
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| let pointer = to_native::<i32>(&inputs[0], instruction)? as usize; |
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Does the fact this is an i32 cause a problem? It seems that we can't access the upper 2gb of memory by casting from i32 to usize because -1i32 as usize is 18446744073709551615; -1i32 as u32 as usize is 4294967295 which seems closer to what we'd want here.
If this is a mistake, perhaps we should add some tests using the upper 2gb of memory to make sure everything is working as expected as this issue will likely be in a lot of places!
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Hmm. The pointer is of kind i32 in the spec. It is regular a Wasm core type i32. Our API needs a usize, hence the casting.
You're right we need to check it is positive. I'm opening an issue to focus on that.
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1329: feat(interface-types) New numbers and strings instructions r=Hywan a=Hywan This PR does 3 things: * Transforms the `x-to-y` number lowerings and liftings instructions to the new set of instructions `y.from_x`. It's just the opposite. It's more logical, but the diff is dense due to that. The `lowering_lifting` module is renamed `numbers`. * Renames `memory-to-string` to `string.lift_memory`, and `string-to-memory` to `string.lower_memory`. It's also more logical, but the diff is dense due to that too. The `memory_to_string` and `string_to_module` modules are merged into the `strings` module. * Introduce the new `string.size` instruction (in the `strings` module). I think commits are clean and atomic enough, so it might be better to review it like that. For binary encoding/decoding, the binary representation is absolutely entirely arbitrary (since the working notes define nothing, obviously). Cf https://github.com/WebAssembly/interface-types/blob/master/proposals/interface-types/working-notes/Instructions.md Co-authored-by: Ivan Enderlin <[email protected]> Co-authored-by: Ivan Enderlin <[email protected]>
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This PR does 3 things:
x-to-ynumber lowerings and liftings instructions to the new set of instructionsy.from_x. It's just the opposite. It's more logical, but the diff is dense due to that. Thelowering_liftingmodule is renamednumbers.memory-to-stringtostring.lift_memory, andstring-to-memorytostring.lower_memory. It's also more logical, but the diff is dense due to that too. Thememory_to_stringandstring_to_modulemodules are merged into thestringsmodule.string.sizeinstruction (in thestringsmodule).I think commits are clean and atomic enough, so it might be better to review it like that.
For binary encoding/decoding, the binary representation is absolutely entirely arbitrary (since the working notes define nothing, obviously).
Cf https://github.com/WebAssembly/interface-types/blob/master/proposals/interface-types/working-notes/Instructions.md