This PR modifies `specializeResetT` so that it generates the proper
reset code for range types. I've tested it in the examples for issues
#23214 and #22462 as well as our codebase, and it seems to fix the
issues I had been experiencing.
fixes#23200, fixes#18866#21065 made it so `auto` proc return types remained as `tyAnything` and
not turned to `tyUntyped`. This had the side effect that anything
previously bound to `tyAnything` in the proc type match was then bound
to the proc return type, which is wrong since we don't know the proc
return type even if we know the expected parameter types (`tyUntyped`
also [does not care about its previous bindings in
`typeRel`](ab4278d217/compiler/sigmatch.nim (L1059-L1061))
maybe for this reason).
Now we mark `tyAnything` return types for routines as `tfRetType` [as
done for other meta return
types](18b5fb256d/compiler/semtypes.nim (L1451)),
and ignore bindings to `tyAnything` + `tfRetType` types in `semtypinst`.
On top of this, we reset the type relation in `paramTypesMatch` only
after creating the instantiation (instead of trusting
`isInferred`/`isInferredConvertible` before creating the instantiation),
using the same mechanism that `isBothMetaConvertible` uses.
This fixes the issues as well as making the disabled t15386_2 test
introduced in #21065 work. As seen in the changes for the other tests,
the error messages give an obscure `proc (a: GenericParam): auto` now,
but it does give the correct error that the overload doesn't match
instead of matching the overload pre-emptively and expecting a specific
return type.
tsugar had to be changed due to #16906, which is the problem where
`void` is not inferred in the case where `result` was never touched.
fixes#23186
As explained in #23186, generics can transform `genericProc[int]` into a
call `` `[]`(genericProc, int) `` which causes a problem when
`genericProc` is resemmed, since it is not a resolved generic proc. `[]`
needs unresolved generic procs since `mArrGet` also handles explicit
generic instantiations, so delay the resolved generic proc check to
`semFinishOperands` which is intentionally not called for `mArrGet`.
The root issue for
[t6137](https://github.com/nim-lang/Nim/blob/devel/tests/generics/t6137.nim)
is also fixed (because this change breaks it otherwise), the compiler
doesn't consider the possibility that an assigned generic param can be
an unresolved static value (note the line `if t.kind == tyStatic: s.ast
= t.n` below the change in sigmatch), now it properly errors that it
couldn't instantiate it as it would for a type param. ~~The change in
semtypinst is just for symmetry with the code above it which also gives
a `cannot instantiate` error, it may or may not be necessary/correct.~~
Now removed, I don't think it was correct.
Still possible that this has unintended consequences.
Nim manual says:
> When using the Cpp backend, params marked as byref will translate to
cpp references `&`
But how `byref` pragma translate to depends on whether it is used with
`importc` or `importcpp`.
When `byref` pragma used with `importc` types and compiled with the Cpp
backend, it is not traslated to cpp reference `&`.
---------
Co-authored-by: Andreas Rumpf <rumpf_a@web.de>
- Clarified the implications of order of operation.
- Mentioned overlapping isn't handled
- Added the runnableExamples block
Fixes#23160, which supposedly should have been fixed in an earlier PR
#23022, but the wording was still not clear enough to my liking, which
the raised issue kind of confirms.
fixes#23177
`changeType` doesn't perform range checks to see if the expression fits
the new type [if the old type is the same as the new
type](62d8ca4306/compiler/semexprs.nim (L633)).
For `nkIntLit`, we previously set the type to the concrete base of the
expected type first, then call `changeType`, which works for things like
range types but not bare types of smaller bit size like `int8`. Now we
don't set the type (so the type is nil), and `changeType` performs the
range check when the type is unset (nil).
fixes#22775
It's pre-existing that [`prepareOperand` doesn't typecheck expressions
which have
types](a4f3bf3742/compiler/sigmatch.nim (L2444)).
Templates can take typed subscript expressions, transform them into
calls to `[]`, and then have this `[]` not be resolved later if the
expression is nested inside of a call argument, which leaks an untyped
expression past semantic analysis. To prevent this, don't transform any
typed subscript expressions into calls to `[]` in templates. Ditto for
curly subscripts (with `{}`) and assignments to subscripts and curly
subscripts (with `[]=` and `{}=`).
This is in reference to a [feature
request](https://github.com/nim-lang/Nim/issues/22142) that I posted.
I'm making this PR to demonstrate the suggested change and expect that
this should be scrutinized
---------
Co-authored-by: Bung <crc32@qq.com>
Co-authored-by: Andreas Rumpf <rumpf_a@web.de>
This PR modernises the NEP1 style guide to prefer hanging indent over
vertial alignment for long code statements while still allowing
alignment in legacy code.
The change is based on research and study of existing style guides for
both braced and indented languages that have seen wide adoption as well
as working with a large Nim codebase with several teams touching the
same code regularly.
The research was done as part of due diligence leading up to
[nph](https://github.com/arnetheduck/nph) which uses this style
throughout.
There are several reasons why hanging indent works well for
collaboration, good code practices and modern Nim features:
* as NEP1 itself points out, alignment causes unnecessary friction when
refactoring, adding/removing items to lists and otherwise improving code
style or due to the need for realignment - the new recommendation aligns
NEP1 with itself
* When collaborating, alignment leads to unnecessary git conflicts and
blame changes - with hanging indent, such conflicts are minimised.
* Vertical alignment pushes much of the code to the right where often
there is little space - when using modern features such as generics
where types may be composed of several (descriptively named) components,
there is simply no more room for parameters or comments
* The space to the left of the alignemnt cannot productively be used for
anything (unlike on the right, where comments may be placed)
* Double hanging indent maintaines visual separation between parameters
/ condition and the body that follows.
This may seem like a drastic change, but in reality, it is not:
* the most popular editor for Nim (vscode) already promotes this style
by default (if you press enter after `(`, it will jump to an indent on
the next line)
* although orthogonal to these changes, tools such as `nph` can be used
to reformat existing code should this be desired - when done in a single
commit, `git blame` is not lost and neither are exsting PRs (they can
simply be reformatted deterministically) - `nph` is also integrated with
vscode.
* It only affects long lines - ie most code remains unchanged
Examples of vertical alignment in the wild, for wildly successful
languages and formatters:
* [PEP-8](https://peps.python.org/pep-0008/#indentation)
*
[black](https://black.readthedocs.io/en/stable/the_black_code_style/current_style.html#how-black-wraps-lines)
* [prettier](https://prettier.io/docs/en/)
The above examples are useful mainly to show that hanging-indent
_generally_ is no impediment to efficient code reading and on the whole
is an uncontroversial choice as befits the standard library.
why ?
- We already have an emit that does the same thing
- The name asm itself is a bit confusing, you might think it's an alias
for asm.js or something else.
- The asm keyword is used differently on different compiler targets (it
makes it inexpressive).
- Does anyone (other than some compiler libraries) use asm instead of
emit ? If yes, it's a bit strange to use asm somewhere and emit
somewhere. By making the asm keyword for js target deprecated, there
would be even less use of the asm keyword for js target, reducing the
amount of confusion.
- New users might accidentally use a non-universal approach via the asm
keyword instead of emit, and then when they learn about asm, try to
figure out what the differences are.
see https://forum.nim-lang.org/t/10821
---------
Co-authored-by: Andreas Rumpf <rumpf_a@web.de>
fixes#23002, fixes#22841, refs comments in #23097
When an identifier is ambiguous in scope (i.e. multiple imports contain
symbols with the same name), attempt resolving it through type inference
(by creating a symchoice). To do this efficiently, `qualifiedLookUp` had
to be broken up so that `semExpr` can access the ambiguous candidates
directly (now obtained directly via `lookUpCandidates`).
This fixes the linked issues, but an example like:
```nim
let on = 123
{.warning[ProveInit]: on.}
```
will still fail, since `on` is unambiguously the local `let` symbol here
(this is also true for `proc on` but `proc` symbols generate symchoices
anyway).
Type symbols are not considered to not confuse the type inference. This
includes the change in sigmatch, up to this point symchoices with
nonoverloadable symbols could be created, they just wouldn't be
considered during disambiguation. Now every proper symbol except types
are considered in disambiguation, so the correct symbols must be picked
during the creation of the symchoice node. I remember there being a
violating case of this in the compiler, but this was very likely fixed
by excluding type symbols as CI seems to have found no issues.
The pure enum ambiguity test was disabled because ambiguous pure enums
now behave like overloadable enums with this behavior, so we get a
longer error message for `echo amb` like `type mismatch: got <MyEnum |
OtherEnum> but expected T`
Filling in some more logic in `typeRel` that I came across when poking
the compiler in another PR. Some of the cases where `typeRel` returns an
"incorrect" result are actually common, but `sumGeneric` ends up
breaking the tie correctly. There isn't anything wrong with that
necessarily, but I assume that it's preferred these functions behave
just as well in isolation as they do when integrated.
I will be following up this description with specific examples.
Fixes an issue where importing the `strutils` module, or any other
importing the `strutils` module, ends up with a compile time error on
platforms where ints are less then 32-bit wide.
The fix follows the suggestions made in #23125.
(Inspired by this pragma in nir asm PR)
`inlineAsmSyntax` pragma allowing specify target inline assembler syntax
in `asm` stmt.
It prevents compiling code with different of the target CC inline asm
syntax, i.e. it will not allow gcc inline asm code to be compiled with
vcc.
```nim
proc nothing() =
asm {.inlineAsmSyntax: "gcc".} """
nop
"""
```
The current C(C++) backend implementation cannot generate code for gcc
and for vcc at the same time. For example, `{.inlineAsmSyntax: "vcc".}`
with the ICC compiler will not generate code with intel asm syntax, even
though ICC can use both gcc-like asm and vcc-like. For implement support
for gcc and for vcc at the same time in ICC compiler, we need to
refactor extccomp
---------
Co-authored-by: Andreas Rumpf <rumpf_a@web.de>
I have made `realloc` absorb unused adjacent memory, which improves the
performance. I'm investigating whether `deallocOsPages` can be used to
improve memory comsumption.
Rendering of `nkRecList` produces an indent and adds a new line at the
end. However for things like case object `of`/`else` branches or `when`
branches this is already done, so this produces 2 indents and an extra
new line. Instead, just add an indent in the place where the indent that
`nkRecList` produces is needed, for the rendering of the final node of
`nkObjectTy`. There doesn't seem to be a need to add the newline.
Before:
```nim
case x*: bool
of true:
y*: int
of false:
nil
```
After:
```nim
case x*: bool
of true:
y*: int
of false:
nil
```
Continued from #23096 which was reverted due to breaking a package and
failing docgen tests. Docgen should now work, but ~~a PR is still
pending for the package: https://github.com/SciNim/Unchained/pull/45~~
has been merged
refs #23091, especially post merge comments
Unsure if `experimental` and `bind` are the perfect constructs to use
but they seem to get the job done here. Symbol nodes do not get marked
`nfOpenSym` if the `bind` statement is used for their symbol, and
`nfOpenSym` nodes do not get replaced by new local symbols if the
experimental switch is not enabled in the local context (meaning it also
works with `push experimental`). However this incurs a warning as the
fact that the node is marked `nfOpenSym` means we did not `bind` it, so
we might want to do that or turn on the experimental switch if we didn't
intend to bind it.
The experimental switch name is arbitrary and could be changed.
---------
Co-authored-by: Andreas Rumpf <rumpf_a@web.de>
This code will crash `check`/`nimsuggest` since the `ra` register is
uninitialised
```nim
import macros
static:
discard parseExpr("'")
```
Now it assigns an empty node so that it has something
Testament changes were so I could properly write a test. It would pass
even with a segfault since it could find the error
