carbon-language/carbon-lang
1
0
Fork 0
mirror of https://github.com/carbon-language/carbon-lang.git synced 2026-09-28 21:04:54 +01:00
Code Issues Packages Projects Releases 10 Wiki Activity
Files
5714f4deb2eaf52d4b2026a02027eb41bf581759
carbon-lang/toolchain/lower/testdata/function/generic/call_recursive_mutual.carbon
T
Jon Ross-PerkinsandDana Jansens 5e3bb523f8 Add builtin functions for destroy, with special requirements in facet types (#6035) 
This is in support of a goal of changing the blanket `destroy` impl to
use (roughly):

```
private fn CanAggregateDestroy() -> type = "type.can_aggregate_destroy";

// Handles aggregate type destruction.
impl forall [AggregateDestroyT:! CanAggregateDestroy()] AggregateDestroyT as Destroy {
  fn Op[addr self: Self*]() = "type.aggregate_destroy";
}
```

That isn't done here because there's still other issues that migrating
raises. What this *does* do is add the builtin functions, and in
particular, support to `FacetTypeInfo` to make `CanAggregateDestroy`
work.

The "special requirement" approach in `FacetTypeInfo` allows us to
support restricting a blanket impl under the current approach of impls.
Maybe we'll find a cleaner approach that can work in the future, but
this fits into the current model by propagating similar to other
requirements. I'm using an enum mask because we have a number of similar
things to add (e.g. copy, move) but I'm not sure we need a full vector.

A few alternatives considered were:

- Supporting syntax more like `where .Self impls
TypeCanAggregateDestroy(.Self, SupportedInterface,
UnsupportedInterface)`. I think it'd be a little cleaner, but requires
better compile-time evaluation in order to assess the type of the call.
Right now it's expected to be a `FacetType` too early to make this work,
and I was concerned about pouring too much more time down this route.
- Providing an actual interface, in particular doing name lookup back
into `Core.` for an interface. This would've added name lookup overhead,
and the question of whether an `impl` exists.
- Generating an interface. This avoids the name lookup, but would still
raise the question of whether an `impl` should also be generated. Work
I've previously done generating interfaces for class destruction also
feels complex to both write and understand (an unfortunate issue).
- Still modeling as an `ImplsConstraint`, for example by defining a
special `InterfaceId::CanAggregateDestroy = -2` similar to what we do on
other ids. I was hesitant because of how this expands the number of
modes of `InterfaceId`, and things for consuming code to watch out for,
for what feels like a relatively niche set of use-cases that are only
interface-like.

---------

Co-authored-by: Dana Jansens <danakj@orodu.net>
2025-09-15 17:03:43 +00:00

228 lines
13 KiB
Plaintext
Raw Blame History

// Part of the Carbon Language project, under the Apache License v2.0 with LLVM
// Exceptions. See /LICENSE for license information.
// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
//
// INCLUDE-FILE: toolchain/testing/testdata/min_prelude/full.carbon
//
// AUTOUPDATE
// TIP: To test this file alone, run:
// TIP: bazel test //toolchain/testing:file_test --test_arg=--file_tests=toolchain/lower/testdata/function/generic/call_recursive_mutual.carbon
// TIP: To dump output, run:
// TIP: bazel run //toolchain/testing:file_test -- --dump_output --file_tests=toolchain/lower/testdata/function/generic/call_recursive_mutual.carbon
// Builds on `call_recursive_basic.carbon`.
// The two specifics for mutual recursive functions F and G,
// when T is a pointer, could be deduplicated.
fn G[T:! Core.Copy](x: T, count: i32) -> T;
fn F[T:! Core.Copy](x: T, count: i32) -> T {
if (count > 3) {
return x;
}
return G(x, count + 1);
}
fn G[T:! Core.Copy](x: T, count: i32) -> T {
if (count > 4) {
return x;
}
return F(x, count + 1);
}
fn M() {
var n: i32 = 0;
var m: f64 = 1.0;
var ptr_i32 : i32*;
var ptr_f64 : f64*;
F(n, 0);
F(m, 0);
F(ptr_i32, 0);
F(ptr_f64, 0);
}
// CHECK:STDOUT: ; ModuleID = 'call_recursive_mutual.carbon'
// CHECK:STDOUT: source_filename = "call_recursive_mutual.carbon"
// CHECK:STDOUT:
// CHECK:STDOUT: define void @_CM.Main() !dbg !4 {
// CHECK:STDOUT: entry:
// CHECK:STDOUT: %n.var = alloca i32, align 4, !dbg !7
// CHECK:STDOUT: %m.var = alloca double, align 8, !dbg !8
// CHECK:STDOUT: %ptr_i32.var = alloca ptr, align 8, !dbg !9
// CHECK:STDOUT: %ptr_f64.var = alloca ptr, align 8, !dbg !10
// CHECK:STDOUT: call void @llvm.lifetime.start.p0(ptr %n.var), !dbg !7
// CHECK:STDOUT: store i32 0, ptr %n.var, align 4, !dbg !7
// CHECK:STDOUT: call void @llvm.lifetime.start.p0(ptr %m.var), !dbg !8
// CHECK:STDOUT: store double 1.000000e+00, ptr %m.var, align 8, !dbg !8
// CHECK:STDOUT: call void @llvm.lifetime.start.p0(ptr %ptr_i32.var), !dbg !9
// CHECK:STDOUT: call void @llvm.lifetime.start.p0(ptr %ptr_f64.var), !dbg !10
// CHECK:STDOUT: %.loc38_5 = load i32, ptr %n.var, align 4, !dbg !11
// CHECK:STDOUT: %F.call.loc38 = call i32 @_CF.Main.de631560529e9861(i32 %.loc38_5, i32 0), !dbg !12
// CHECK:STDOUT: %.loc39_5 = load double, ptr %m.var, align 8, !dbg !13
// CHECK:STDOUT: %F.call.loc39 = call double @_CF.Main.3836ccc537683c19(double %.loc39_5, i32 0), !dbg !14
// CHECK:STDOUT: %.loc40_5 = load ptr, ptr %ptr_i32.var, align 8, !dbg !15
// CHECK:STDOUT: %F.call.loc40 = call ptr @_CF.Main.a194de4a3b8dbd0c(ptr %.loc40_5, i32 0), !dbg !16
// CHECK:STDOUT: %.loc41_5 = load ptr, ptr %ptr_f64.var, align 8, !dbg !17
// CHECK:STDOUT: %F.call.loc41 = call ptr @_CF.Main.a194de4a3b8dbd0c(ptr %.loc41_5, i32 0), !dbg !18
// CHECK:STDOUT: ret void, !dbg !19
// CHECK:STDOUT: }
// CHECK:STDOUT:
// CHECK:STDOUT: ; Function Attrs: nocallback nofree nosync nounwind willreturn memory(argmem: readwrite)
// CHECK:STDOUT: declare void @llvm.lifetime.start.p0(ptr captures(none)) #0
// CHECK:STDOUT:
// CHECK:STDOUT: define linkonce_odr i32 @_CF.Main.de631560529e9861(i32 %x, i32 %count) !dbg !20 {
// CHECK:STDOUT: entry:
// CHECK:STDOUT: %Int.as.OrderedWith.impl.Greater.call = icmp sgt i32 %count, 3, !dbg !21
// CHECK:STDOUT: br i1 %Int.as.OrderedWith.impl.Greater.call, label %if.then, label %if.else, !dbg !22
// CHECK:STDOUT:
// CHECK:STDOUT: if.then: ; preds = %entry
// CHECK:STDOUT: ret i32 %x, !dbg !23
// CHECK:STDOUT:
// CHECK:STDOUT: if.else: ; preds = %entry
// CHECK:STDOUT: %Int.as.AddWith.impl.Op.call = add i32 %count, 1, !dbg !24
// CHECK:STDOUT: %G.call = call i32 @_CG.Main.de631560529e9861(i32 %x, i32 %Int.as.AddWith.impl.Op.call), !dbg !25
// CHECK:STDOUT: ret i32 %G.call, !dbg !26
// CHECK:STDOUT: }
// CHECK:STDOUT:
// CHECK:STDOUT: define linkonce_odr double @_CF.Main.3836ccc537683c19(double %x, i32 %count) !dbg !27 {
// CHECK:STDOUT: entry:
// CHECK:STDOUT: %Int.as.OrderedWith.impl.Greater.call = icmp sgt i32 %count, 3, !dbg !28
// CHECK:STDOUT: br i1 %Int.as.OrderedWith.impl.Greater.call, label %if.then, label %if.else, !dbg !29
// CHECK:STDOUT:
// CHECK:STDOUT: if.then: ; preds = %entry
// CHECK:STDOUT: ret double %x, !dbg !30
// CHECK:STDOUT:
// CHECK:STDOUT: if.else: ; preds = %entry
// CHECK:STDOUT: %Int.as.AddWith.impl.Op.call = add i32 %count, 1, !dbg !31
// CHECK:STDOUT: %G.call = call double @_CG.Main.3836ccc537683c19(double %x, i32 %Int.as.AddWith.impl.Op.call), !dbg !32
// CHECK:STDOUT: ret double %G.call, !dbg !33
// CHECK:STDOUT: }
// CHECK:STDOUT:
// CHECK:STDOUT: define linkonce_odr ptr @_CF.Main.a194de4a3b8dbd0c(ptr %x, i32 %count) !dbg !34 {
// CHECK:STDOUT: entry:
// CHECK:STDOUT: %Int.as.OrderedWith.impl.Greater.call = icmp sgt i32 %count, 3, !dbg !35
// CHECK:STDOUT: br i1 %Int.as.OrderedWith.impl.Greater.call, label %if.then, label %if.else, !dbg !36
// CHECK:STDOUT:
// CHECK:STDOUT: if.then: ; preds = %entry
// CHECK:STDOUT: ret ptr %x, !dbg !37
// CHECK:STDOUT:
// CHECK:STDOUT: if.else: ; preds = %entry
// CHECK:STDOUT: %Int.as.AddWith.impl.Op.call = add i32 %count, 1, !dbg !38
// CHECK:STDOUT: %G.call = call ptr @_CG.Main.a194de4a3b8dbd0c(ptr %x, i32 %Int.as.AddWith.impl.Op.call), !dbg !39
// CHECK:STDOUT: ret ptr %G.call, !dbg !40
// CHECK:STDOUT: }
// CHECK:STDOUT:
// CHECK:STDOUT: define linkonce_odr i32 @_CG.Main.de631560529e9861(i32 %x, i32 %count) !dbg !41 {
// CHECK:STDOUT: entry:
// CHECK:STDOUT: %Int.as.OrderedWith.impl.Greater.call = icmp sgt i32 %count, 4, !dbg !42
// CHECK:STDOUT: br i1 %Int.as.OrderedWith.impl.Greater.call, label %if.then, label %if.else, !dbg !43
// CHECK:STDOUT:
// CHECK:STDOUT: if.then: ; preds = %entry
// CHECK:STDOUT: ret i32 %x, !dbg !44
// CHECK:STDOUT:
// CHECK:STDOUT: if.else: ; preds = %entry
// CHECK:STDOUT: %Int.as.AddWith.impl.Op.call = add i32 %count, 1, !dbg !45
// CHECK:STDOUT: %F.call = call i32 @_CF.Main.de631560529e9861(i32 %x, i32 %Int.as.AddWith.impl.Op.call), !dbg !46
// CHECK:STDOUT: ret i32 %F.call, !dbg !47
// CHECK:STDOUT: }
// CHECK:STDOUT:
// CHECK:STDOUT: define linkonce_odr double @_CG.Main.3836ccc537683c19(double %x, i32 %count) !dbg !48 {
// CHECK:STDOUT: entry:
// CHECK:STDOUT: %Int.as.OrderedWith.impl.Greater.call = icmp sgt i32 %count, 4, !dbg !49
// CHECK:STDOUT: br i1 %Int.as.OrderedWith.impl.Greater.call, label %if.then, label %if.else, !dbg !50
// CHECK:STDOUT:
// CHECK:STDOUT: if.then: ; preds = %entry
// CHECK:STDOUT: ret double %x, !dbg !51
// CHECK:STDOUT:
// CHECK:STDOUT: if.else: ; preds = %entry
// CHECK:STDOUT: %Int.as.AddWith.impl.Op.call = add i32 %count, 1, !dbg !52
// CHECK:STDOUT: %F.call = call double @_CF.Main.3836ccc537683c19(double %x, i32 %Int.as.AddWith.impl.Op.call), !dbg !53
// CHECK:STDOUT: ret double %F.call, !dbg !54
// CHECK:STDOUT: }
// CHECK:STDOUT:
// CHECK:STDOUT: define linkonce_odr ptr @_CG.Main.a194de4a3b8dbd0c(ptr %x, i32 %count) !dbg !55 {
// CHECK:STDOUT: entry:
// CHECK:STDOUT: %Int.as.OrderedWith.impl.Greater.call = icmp sgt i32 %count, 4, !dbg !56
// CHECK:STDOUT: br i1 %Int.as.OrderedWith.impl.Greater.call, label %if.then, label %if.else, !dbg !57
// CHECK:STDOUT:
// CHECK:STDOUT: if.then: ; preds = %entry
// CHECK:STDOUT: ret ptr %x, !dbg !58
// CHECK:STDOUT:
// CHECK:STDOUT: if.else: ; preds = %entry
// CHECK:STDOUT: %Int.as.AddWith.impl.Op.call = add i32 %count, 1, !dbg !59
// CHECK:STDOUT: %F.call = call ptr @_CF.Main.a194de4a3b8dbd0c(ptr %x, i32 %Int.as.AddWith.impl.Op.call), !dbg !60
// CHECK:STDOUT: ret ptr %F.call, !dbg !61
// CHECK:STDOUT: }
// CHECK:STDOUT:
// CHECK:STDOUT: ; uselistorder directives
// CHECK:STDOUT: uselistorder ptr @llvm.lifetime.start.p0, { 3, 2, 1, 0 }
// CHECK:STDOUT: uselistorder ptr @_CF.Main.a194de4a3b8dbd0c, { 1, 2, 0 }
// CHECK:STDOUT:
// CHECK:STDOUT: attributes #0 = { nocallback nofree nosync nounwind willreturn memory(argmem: readwrite) }
// CHECK:STDOUT:
// CHECK:STDOUT: !llvm.module.flags = !{!0, !1}
// CHECK:STDOUT: !llvm.dbg.cu = !{!2}
// CHECK:STDOUT:
// CHECK:STDOUT: !0 = !{i32 7, !"Dwarf Version", i32 5}
// CHECK:STDOUT: !1 = !{i32 2, !"Debug Info Version", i32 3}
// CHECK:STDOUT: !2 = distinct !DICompileUnit(language: DW_LANG_C, file: !3, producer: "carbon", isOptimized: false, runtimeVersion: 0, emissionKind: FullDebug)
// CHECK:STDOUT: !3 = !DIFile(filename: "call_recursive_mutual.carbon", directory: "")
// CHECK:STDOUT: !4 = distinct !DISubprogram(name: "M", linkageName: "_CM.Main", scope: null, file: !3, line: 32, type: !5, spFlags: DISPFlagDefinition, unit: !2)
// CHECK:STDOUT: !5 = !DISubroutineType(types: !6)
// CHECK:STDOUT: !6 = !{}
// CHECK:STDOUT: !7 = !DILocation(line: 33, column: 3, scope: !4)
// CHECK:STDOUT: !8 = !DILocation(line: 34, column: 3, scope: !4)
// CHECK:STDOUT: !9 = !DILocation(line: 35, column: 3, scope: !4)
// CHECK:STDOUT: !10 = !DILocation(line: 36, column: 3, scope: !4)
// CHECK:STDOUT: !11 = !DILocation(line: 38, column: 5, scope: !4)
// CHECK:STDOUT: !12 = !DILocation(line: 38, column: 3, scope: !4)
// CHECK:STDOUT: !13 = !DILocation(line: 39, column: 5, scope: !4)
// CHECK:STDOUT: !14 = !DILocation(line: 39, column: 3, scope: !4)
// CHECK:STDOUT: !15 = !DILocation(line: 40, column: 5, scope: !4)
// CHECK:STDOUT: !16 = !DILocation(line: 40, column: 3, scope: !4)
// CHECK:STDOUT: !17 = !DILocation(line: 41, column: 5, scope: !4)
// CHECK:STDOUT: !18 = !DILocation(line: 41, column: 3, scope: !4)
// CHECK:STDOUT: !19 = !DILocation(line: 32, column: 1, scope: !4)
// CHECK:STDOUT: !20 = distinct !DISubprogram(name: "F", linkageName: "_CF.Main.de631560529e9861", scope: null, file: !3, line: 18, type: !5, spFlags: DISPFlagDefinition, unit: !2)
// CHECK:STDOUT: !21 = !DILocation(line: 19, column: 7, scope: !20)
// CHECK:STDOUT: !22 = !DILocation(line: 19, column: 6, scope: !20)
// CHECK:STDOUT: !23 = !DILocation(line: 20, column: 5, scope: !20)
// CHECK:STDOUT: !24 = !DILocation(line: 22, column: 15, scope: !20)
// CHECK:STDOUT: !25 = !DILocation(line: 22, column: 10, scope: !20)
// CHECK:STDOUT: !26 = !DILocation(line: 22, column: 3, scope: !20)
// CHECK:STDOUT: !27 = distinct !DISubprogram(name: "F", linkageName: "_CF.Main.3836ccc537683c19", scope: null, file: !3, line: 18, type: !5, spFlags: DISPFlagDefinition, unit: !2)
// CHECK:STDOUT: !28 = !DILocation(line: 19, column: 7, scope: !27)
// CHECK:STDOUT: !29 = !DILocation(line: 19, column: 6, scope: !27)
// CHECK:STDOUT: !30 = !DILocation(line: 20, column: 5, scope: !27)
// CHECK:STDOUT: !31 = !DILocation(line: 22, column: 15, scope: !27)
// CHECK:STDOUT: !32 = !DILocation(line: 22, column: 10, scope: !27)
// CHECK:STDOUT: !33 = !DILocation(line: 22, column: 3, scope: !27)
// CHECK:STDOUT: !34 = distinct !DISubprogram(name: "F", linkageName: "_CF.Main.a194de4a3b8dbd0c", scope: null, file: !3, line: 18, type: !5, spFlags: DISPFlagDefinition, unit: !2)
// CHECK:STDOUT: !35 = !DILocation(line: 19, column: 7, scope: !34)
// CHECK:STDOUT: !36 = !DILocation(line: 19, column: 6, scope: !34)
// CHECK:STDOUT: !37 = !DILocation(line: 20, column: 5, scope: !34)
// CHECK:STDOUT: !38 = !DILocation(line: 22, column: 15, scope: !34)
// CHECK:STDOUT: !39 = !DILocation(line: 22, column: 10, scope: !34)
// CHECK:STDOUT: !40 = !DILocation(line: 22, column: 3, scope: !34)
// CHECK:STDOUT: !41 = distinct !DISubprogram(name: "G", linkageName: "_CG.Main.de631560529e9861", scope: null, file: !3, line: 25, type: !5, spFlags: DISPFlagDefinition, unit: !2)
// CHECK:STDOUT: !42 = !DILocation(line: 26, column: 7, scope: !41)
// CHECK:STDOUT: !43 = !DILocation(line: 26, column: 6, scope: !41)
// CHECK:STDOUT: !44 = !DILocation(line: 27, column: 5, scope: !41)
// CHECK:STDOUT: !45 = !DILocation(line: 29, column: 15, scope: !41)
// CHECK:STDOUT: !46 = !DILocation(line: 29, column: 10, scope: !41)
// CHECK:STDOUT: !47 = !DILocation(line: 29, column: 3, scope: !41)
// CHECK:STDOUT: !48 = distinct !DISubprogram(name: "G", linkageName: "_CG.Main.3836ccc537683c19", scope: null, file: !3, line: 25, type: !5, spFlags: DISPFlagDefinition, unit: !2)
// CHECK:STDOUT: !49 = !DILocation(line: 26, column: 7, scope: !48)
// CHECK:STDOUT: !50 = !DILocation(line: 26, column: 6, scope: !48)
// CHECK:STDOUT: !51 = !DILocation(line: 27, column: 5, scope: !48)
// CHECK:STDOUT: !52 = !DILocation(line: 29, column: 15, scope: !48)
// CHECK:STDOUT: !53 = !DILocation(line: 29, column: 10, scope: !48)
// CHECK:STDOUT: !54 = !DILocation(line: 29, column: 3, scope: !48)
// CHECK:STDOUT: !55 = distinct !DISubprogram(name: "G", linkageName: "_CG.Main.a194de4a3b8dbd0c", scope: null, file: !3, line: 25, type: !5, spFlags: DISPFlagDefinition, unit: !2)
// CHECK:STDOUT: !56 = !DILocation(line: 26, column: 7, scope: !55)
// CHECK:STDOUT: !57 = !DILocation(line: 26, column: 6, scope: !55)
// CHECK:STDOUT: !58 = !DILocation(line: 27, column: 5, scope: !55)
// CHECK:STDOUT: !59 = !DILocation(line: 29, column: 15, scope: !55)
// CHECK:STDOUT: !60 = !DILocation(line: 29, column: 10, scope: !55)
// CHECK:STDOUT: !61 = !DILocation(line: 29, column: 3, scope: !55)
Reference in New Issue View Git Blame Copy Permalink