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carbon-lang/toolchain/lower/testdata/operators/increment.carbon
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Dana Jansens 4261bb2dd2 Track and don't replace active .Self (#7443) 
In #7436 we stopped substituting `.Self` when collecting witnesses out
of a facet type. While this was correct, it did not capture all the
cases that need to avoid substituting `.Self`. And it poisoned the
`IdentifiedFacetType` cache by not replacing `.Self` but storing the
result in the cache. This led to incoherent behaviour, where the result
of an impl lookup would change depending on which ones had been done
previously.

Now we use a flag to track for each `.Self` if we're currently
type-checking inside the scope where it was introduced in a facet type.
While inside that scope, identify should not replace the `.Self`. Any
use of it should remain as-is since we don't yet know what value will
replace it. We call this state "frozen" since it should not be modified
by identify. This requires a substitution step when we leave the scope
that introduced the `.Self`, to remove the flag. The flag is set in the
`EntityName` of the `SymbolicBinding`, and is part of the canonical
value, since `.Self` can become part of types, which are constants, and
the flag needs to follow it for correct behaviour.

We also have to ensure the flag is the same when doing comparison with
constants from inside a facet type and constants from outside. For
instance in `(Z where .Z1 = ()) where .Z2 = .Z1`, when we arrive at the
second `.Z1` its `.Self` will be frozen, while the `.Z1 = ()` contains a
non-frozen `.Self`. So we add the frozen flag to the first when storing
it in `where_stack` in order to compare the constant values of the two
`.Z1`.

The `WhereExpr` requirement inst kinds now have an `InstConstantKind` of
`AlwaysUnique` instead of `Never`. This allows us to add them to the
usual InstBlocks, and in an `eval fn` body they have a constant value,
so eval does not fail when trying to call that function. We have to be
careful to not consider `AlwaysUnique` as being actually concrete
though, since their constant value erases `.Self`-dependence. This
allows us to stop special casing them when thawing the requirements
block in a `WhereExpr`, and we can just thaw each `InstId` in the block
in a straightforward manner.

We add the new flag to the instruction's fingerprint and name in
formatted semir.
2026-07-08 18:04:56 +00:00

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// 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/operators/increment.carbon
// TIP: To dump output, run:
// TIP: bazel run //toolchain/testing:file_test -- --dump_output --file_tests=toolchain/lower/testdata/operators/increment.carbon
// --- increment.carbon
library "[[@TEST_NAME]]";
fn IncrSigned() {
var from: i32 = 0;
++from;
}
// CHECK:STDOUT: ; ---
// CHECK:STDOUT: ; ModuleID = 'increment.carbon'
// CHECK:STDOUT: source_filename = "increment.carbon"
// CHECK:STDOUT:
// CHECK:STDOUT: ; Function Attrs: nounwind
// CHECK:STDOUT: define void @_CIncrSigned.Main() #0 !dbg !4 {
// CHECK:STDOUT: entry:
// CHECK:STDOUT: %from.var = alloca i32, align 4, !dbg !7
// CHECK:STDOUT: call void @llvm.lifetime.start.p0(ptr %from.var), !dbg !7
// CHECK:STDOUT: store i32 0, ptr %from.var, align 4, !dbg !7
// CHECK:STDOUT: call void @"_COp.Int.9452f4c51951679b.Core:Inc.Core.be1e879c1ad406d8"(ptr %from.var), !dbg !8
// CHECK:STDOUT: call void @"_COp.5e27612b9dd31a14:core.Destroy.Core"(ptr %from.var), !dbg !7
// CHECK:STDOUT: ret void, !dbg !9
// CHECK:STDOUT: }
// CHECK:STDOUT:
// CHECK:STDOUT: ; Function Attrs: nounwind
// CHECK:STDOUT: define weak_odr void @"_COp.5e27612b9dd31a14:core.Destroy.Core"(ptr %self) #0 !dbg !10 {
// CHECK:STDOUT: entry:
// CHECK:STDOUT: ret void, !dbg !16
// 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)) #1
// CHECK:STDOUT:
// CHECK:STDOUT: ; Function Attrs: nounwind
// CHECK:STDOUT: define linkonce_odr void @"_COp.Int.9452f4c51951679b.Core:Inc.Core.be1e879c1ad406d8"(ptr %self) #0 !dbg !17 {
// CHECK:STDOUT: call void @"_COp:thunk:AddAssignWith.6f9e8c1abf8bb3ea.Core:Int.9452f4c51951679b.Core:AddAssignWith.bcc2a64c00f3554f.Core.224cb1ed5cb3f064"(ptr %self, i32 1), !dbg !21
// CHECK:STDOUT: ret void, !dbg !22
// CHECK:STDOUT: }
// CHECK:STDOUT:
// CHECK:STDOUT: ; Function Attrs: alwaysinline nounwind
// CHECK:STDOUT: define linkonce_odr void @"_COp:thunk:AddAssignWith.6f9e8c1abf8bb3ea.Core:Int.9452f4c51951679b.Core:AddAssignWith.bcc2a64c00f3554f.Core.224cb1ed5cb3f064"(ptr %self, i32 %other) #2 !dbg !23 {
// CHECK:STDOUT: %1 = call i32 @"_CConvert.45e1f8de18643ddf:ImplicitAs.0bc6489996802dd4.Core.f0377c795e793659"(i32 %other), !dbg !29
// CHECK:STDOUT: %2 = load i32, ptr %self, align 4, !dbg !30
// CHECK:STDOUT: %3 = add i32 %2, %1, !dbg !30
// CHECK:STDOUT: store i32 %3, ptr %self, align 4, !dbg !30
// CHECK:STDOUT: ret void, !dbg !30
// CHECK:STDOUT: }
// CHECK:STDOUT:
// CHECK:STDOUT: ; Function Attrs: nounwind
// CHECK:STDOUT: define linkonce_odr i32 @"_CConvert.45e1f8de18643ddf:ImplicitAs.0bc6489996802dd4.Core.f0377c795e793659"(i32 %self) #0 !dbg !31 {
// CHECK:STDOUT: %1 = call i32 @"_CAsInt.Int.9452f4c51951679b.Core:AnyInt.Core.be1e879c1ad406d8"(i32 %self), !dbg !36
// CHECK:STDOUT: ret i32 %1, !dbg !37
// CHECK:STDOUT: }
// CHECK:STDOUT:
// CHECK:STDOUT: ; Function Attrs: nounwind
// CHECK:STDOUT: define linkonce_odr i32 @"_CAsInt.Int.9452f4c51951679b.Core:AnyInt.Core.be1e879c1ad406d8"(i32 %self) #0 !dbg !38 {
// CHECK:STDOUT: ret i32 %self, !dbg !41
// CHECK:STDOUT: }
// CHECK:STDOUT:
// CHECK:STDOUT: attributes #0 = { nounwind }
// CHECK:STDOUT: attributes #1 = { nocallback nofree nosync nounwind willreturn memory(argmem: readwrite) }
// CHECK:STDOUT: attributes #2 = { alwaysinline nounwind }
// CHECK:STDOUT:
// CHECK:STDOUT: !llvm.dbg.cu = !{!0}
// CHECK:STDOUT: !llvm.module.flags = !{!2, !3}
// CHECK:STDOUT:
// CHECK:STDOUT: !0 = distinct !DICompileUnit(language: DW_LANG_C_plus_plus, file: !1, producer: "carbon", isOptimized: false, runtimeVersion: 0, emissionKind: FullDebug)
// CHECK:STDOUT: !1 = !DIFile(filename: "increment.carbon", directory: "")
// CHECK:STDOUT: !2 = !{i32 7, !"Dwarf Version", i32 5}
// CHECK:STDOUT: !3 = !{i32 2, !"Debug Info Version", i32 3}
// CHECK:STDOUT: !4 = distinct !DISubprogram(name: "IncrSigned", linkageName: "_CIncrSigned.Main", scope: null, file: !1, line: 4, type: !5, spFlags: DISPFlagDefinition, unit: !0)
// CHECK:STDOUT: !5 = !DISubroutineType(types: !6)
// CHECK:STDOUT: !6 = !{null}
// CHECK:STDOUT: !7 = !DILocation(line: 5, column: 3, scope: !4)
// CHECK:STDOUT: !8 = !DILocation(line: 6, column: 3, scope: !4)
// CHECK:STDOUT: !9 = !DILocation(line: 4, column: 1, scope: !4)
// CHECK:STDOUT: !10 = distinct !DISubprogram(name: "Op", linkageName: "_COp.5e27612b9dd31a14:core.Destroy.Core", scope: null, file: !1, line: 5, type: !11, spFlags: DISPFlagDefinition, unit: !0, retainedNodes: !14)
// CHECK:STDOUT: !11 = !DISubroutineType(types: !12)
// CHECK:STDOUT: !12 = !{null, !13}
// CHECK:STDOUT: !13 = !DIBasicType(name: "int", size: 32, encoding: DW_ATE_signed)
// CHECK:STDOUT: !14 = !{!15}
// CHECK:STDOUT: !15 = !DILocalVariable(arg: 1, scope: !10, type: !13)
// CHECK:STDOUT: !16 = !DILocation(line: 5, column: 3, scope: !10)
// CHECK:STDOUT: !17 = distinct !DISubprogram(name: "Op", linkageName: "_COp.Int.9452f4c51951679b.Core:Inc.Core.be1e879c1ad406d8", scope: null, file: !18, line: 396, type: !11, spFlags: DISPFlagDefinition, unit: !0, retainedNodes: !19)
// CHECK:STDOUT: !18 = !DIFile(filename: "{{.*}}/prelude/types/int.carbon", directory: "")
// CHECK:STDOUT: !19 = !{!20}
// CHECK:STDOUT: !20 = !DILocalVariable(arg: 1, scope: !17, type: !13)
// CHECK:STDOUT: !21 = !DILocation(line: 398, column: 5, scope: !17)
// CHECK:STDOUT: !22 = !DILocation(line: 396, column: 3, scope: !17)
// CHECK:STDOUT: !23 = distinct !DISubprogram(name: "Op", linkageName: "_COp:thunk:AddAssignWith.6f9e8c1abf8bb3ea.Core:Int.9452f4c51951679b.Core:AddAssignWith.bcc2a64c00f3554f.Core.224cb1ed5cb3f064", scope: null, file: !18, line: 331, type: !24, spFlags: DISPFlagDefinition, unit: !0, retainedNodes: !26)
// CHECK:STDOUT: !24 = !DISubroutineType(types: !25)
// CHECK:STDOUT: !25 = !{null, !13, !13}
// CHECK:STDOUT: !26 = !{!27, !28}
// CHECK:STDOUT: !27 = !DILocalVariable(arg: 1, scope: !23, type: !13)
// CHECK:STDOUT: !28 = !DILocalVariable(arg: 2, scope: !23, type: !13)
// CHECK:STDOUT: !29 = !DILocation(line: 0, scope: !23)
// CHECK:STDOUT: !30 = !DILocation(line: 331, column: 3, scope: !23)
// CHECK:STDOUT: !31 = distinct !DISubprogram(name: "Convert", linkageName: "_CConvert.45e1f8de18643ddf:ImplicitAs.0bc6489996802dd4.Core.f0377c795e793659", scope: null, file: !18, line: 64, type: !32, spFlags: DISPFlagDefinition, unit: !0, retainedNodes: !34)
// CHECK:STDOUT: !32 = !DISubroutineType(types: !33)
// CHECK:STDOUT: !33 = !{!13, !13}
// CHECK:STDOUT: !34 = !{!35}
// CHECK:STDOUT: !35 = !DILocalVariable(arg: 1, scope: !31, type: !13)
// CHECK:STDOUT: !36 = !DILocation(line: 66, column: 17, scope: !31)
// CHECK:STDOUT: !37 = !DILocation(line: 66, column: 5, scope: !31)
// CHECK:STDOUT: !38 = distinct !DISubprogram(name: "AsInt", linkageName: "_CAsInt.Int.9452f4c51951679b.Core:AnyInt.Core.be1e879c1ad406d8", scope: null, file: !18, line: 59, type: !32, spFlags: DISPFlagDefinition, unit: !0, retainedNodes: !39)
// CHECK:STDOUT: !39 = !{!40}
// CHECK:STDOUT: !40 = !DILocalVariable(arg: 1, scope: !38, type: !13)
// CHECK:STDOUT: !41 = !DILocation(line: 59, column: 28, scope: !38)
// CHECK:STDOUT:
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