Slice/Array intrinsics: __slice and __elem_at
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__slice and __slice_elem__slice and __elem_at
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## Description This PR is part of #5110 and introduces two new intrinsic: `__slice` and `__elem_at`. `__slice` allows the creation of slices by slicing arrays or other slices. Whilst `__elem_at` returns a reference to an item inside the slice or the array. ## Out of bounds checks These intrinsic will not generate any runtime checks, these must be done manually, when and where appropriate; but they do a complete static analysis of all indices, to avoid runtime buffer overflows, when possible. That means that at runtime, it is possible to do a buffer overflow when reading/writing, which is an "undefined behaviour" as to what will happen. ## Empty Array This PR also solves a problem with empty arrays. Before empty arrays such as `let a = []` were being type-checked as `[Never; 0]`, which means that any code after them was being marked as dead. Now we correctly type check them as `[Unknown; 0]` and return a more friendly error. ``` 4 | 5 | // Empty array 6 | let a = []; | ^^ Type must be known at this point 7 | } | ____ ``` ## Check of constants inside fns This PR also solves a problem with not checking `const` expressions inside `fns`. We, for example, do not allow slices in constants, but we were only checking globals. Now we check constants also inside functions, methods etc... ## Small improvements for our e2e We can now `dbg` inside our e2e harness and get results like the ones below. One needs to include the lib `test/src/e2e_vm_tests/utils` and cal `something.dbg()` or `something.dbgln()`. There is no magic, and structs/enums will need to manually implement the `Dbg` trait. This is only to facilitate the debugging of our e2e tests.  ## Checklist - [ ] I have linked to any relevant issues. - [ ] I have commented my code, particularly in hard-to-understand areas. - [ ] I have updated the documentation where relevant (API docs, the reference, and the Sway book). - [ ] If my change requires substantial documentation changes, I have [requested support from the DevRel team](https://github.com/FuelLabs/devrel-requests/issues/new/choose) - [ ] I have added tests that prove my fix is effective or that my feature works. - [ ] I have added (or requested a maintainer to add) the necessary `Breaking*` or `New Feature` labels where relevant. - [ ] I have done my best to ensure that my PR adheres to [the Fuel Labs Code Review Standards](https://github.com/FuelLabs/rfcs/blob/master/text/code-standards/external-contributors.md). - [ ] I have requested a review from the relevant team or maintainers.
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Description
This PR is part of #5110 and introduces two new intrinsic:
__sliceand__elem_at.__sliceallows the creation of slices by slicing arrays or other slices. Whilst__elem_atreturns a reference to an item inside the slice or the array.Out of bounds checks
These intrinsic will not generate any runtime checks, these must be done manually, when and where appropriate; but they do a complete static analysis of all indices, to avoid runtime buffer overflows, when possible.
That means that at runtime, it is possible to do a buffer overflow when reading/writing, which is an "undefined behaviour" as to what will happen.
Empty Array
This PR also solves a problem with empty arrays. Before empty arrays such as
let a = []were being type-checked as[Never; 0], which means that any code after them was being marked as dead.Now we correctly type check them as
[Unknown; 0]and return a more friendly error.Check of constants inside fns
This PR also solves a problem with not checking
constexpressions insidefns. We, for example, do not allow slices in constants, but we were only checking globals. Now we check constants also inside functions, methods etc...Small improvements for our e2e
We can now
dbginside our e2e harness and get results like the ones below. One needs to include the libtest/src/e2e_vm_tests/utilsand calsomething.dbg()orsomething.dbgln(). There is no magic, and structs/enums will need to manually implement theDbgtrait.This is only to facilitate the debugging of our e2e tests.
Checklist
Breaking*orNew Featurelabels where relevant.