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carbon-lang/toolchain/lower/testdata/array/base.carbon
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Richard Smith b1230218d5 Make fingerprinting stable across compatible source changes. (#4789) 
Include the index rather than the name in the fingerprint of a symbolic
binding. While both the index and the name contribute to the canonical
identity, using either one of them in the fingerprint is sufficient to
ensure that distinct entities get different fingerprints. Changing the
name of a symbolic binding should ideally not result in fingerprint
changes, so exclude the name from the fingerprint when we have an index.

Use the canonical type and constraint when fingerprinting an impl, so
that uses of names in `name_ref` instructions aren't considered, only
the entity the name resolves to, and different ways of spelling the same
type have the same fingerprint. This similarly allows compatible changes
to be made to impls without changing the fingerprint.

Exclude the declaration block when determining the fingerprint of a
declaration. The declaration block contains the declarations of
parameters of the declaration, which do affect whether two declarations
are identical, but not whether they denote the same entity, because it
would be invalid to have different declaration blocks for declarations
with the same name in the same scope. Therefore changes to the
declaration block are compatible, and it's useful for such changes to
not affect the fingerprint.

This is not easy to test in isolation with our current testing
machinery. However, a follow-on PR will change the name of a parameter
in the prelude, and with this in place, will not cause any changes to
occur elsewhere in the toolchain tests.
2025-01-10 22:30:22 +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
//
// AUTOUPDATE
// TIP: To test this file alone, run:
// TIP: bazel test //toolchain/testing:file_test --test_arg=--file_tests=toolchain/lower/testdata/array/base.carbon
// TIP: To dump output, run:
// TIP: bazel run //toolchain/testing:file_test -- --dump_output --file_tests=toolchain/lower/testdata/array/base.carbon
fn Run() {
var a: [i32; 1] = (1,);
var b: [f64; 2] = (11.1, 2.2,);
var c: [(); 5] = ((), (), (), (), (),);
var d: (i32, i32, i32) = (1, 2, 3);
var e: [i32; 3] = d;
}
// CHECK:STDOUT: ; ModuleID = 'base.carbon'
// CHECK:STDOUT: source_filename = "base.carbon"
// CHECK:STDOUT:
// CHECK:STDOUT: @array.237.loc12_25 = internal constant [1 x i32] [i32 1]
// CHECK:STDOUT: @array.6a2.loc13_33 = internal constant [2 x double] [double 0x4026333333333334, double 2.200000e+00]
// CHECK:STDOUT: @array.1cb.loc14_41 = internal constant [5 x {}] zeroinitializer
// CHECK:STDOUT: @tuple.loc15_37 = internal constant { i32, i32, i32 } { i32 1, i32 2, i32 3 }
// CHECK:STDOUT:
// CHECK:STDOUT: define void @main() !dbg !4 {
// CHECK:STDOUT: entry:
// CHECK:STDOUT: %a.var = alloca [1 x i32], align 4, !dbg !7
// CHECK:STDOUT: %b.var = alloca [2 x double], align 8, !dbg !7
// CHECK:STDOUT: %c.var = alloca [5 x {}], align 8, !dbg !7
// CHECK:STDOUT: %d.var = alloca { i32, i32, i32 }, align 8, !dbg !7
// CHECK:STDOUT: %e.var = alloca [3 x i32], align 4, !dbg !7
// CHECK:STDOUT: call void @llvm.lifetime.start.p0(i64 4, ptr %a.var), !dbg !7
// CHECK:STDOUT: %.loc12_24.3.array.index = getelementptr inbounds [1 x i32], ptr %a.var, i32 0, i64 0, !dbg !8
// CHECK:STDOUT: call void @llvm.memcpy.p0.p0.i64(ptr align 4 %a.var, ptr align 4 @array.237.loc12_25, i64 4, i1 false), !dbg !9
// CHECK:STDOUT: call void @llvm.lifetime.start.p0(i64 16, ptr %b.var), !dbg !7
// CHECK:STDOUT: %.loc13_32.2.array.index = getelementptr inbounds [2 x double], ptr %b.var, i32 0, i64 0, !dbg !10
// CHECK:STDOUT: %.loc13_32.4.array.index = getelementptr inbounds [2 x double], ptr %b.var, i32 0, i64 1, !dbg !10
// CHECK:STDOUT: call void @llvm.memcpy.p0.p0.i64(ptr align 8 %b.var, ptr align 8 @array.6a2.loc13_33, i64 16, i1 false), !dbg !11
// CHECK:STDOUT: call void @llvm.lifetime.start.p0(i64 0, ptr %c.var), !dbg !7
// CHECK:STDOUT: %.loc14_40.2.array.index = getelementptr inbounds [5 x {}], ptr %c.var, i32 0, i64 0, !dbg !12
// CHECK:STDOUT: %.loc14_40.4.array.index = getelementptr inbounds [5 x {}], ptr %c.var, i32 0, i64 1, !dbg !12
// CHECK:STDOUT: %.loc14_40.6.array.index = getelementptr inbounds [5 x {}], ptr %c.var, i32 0, i64 2, !dbg !12
// CHECK:STDOUT: %.loc14_40.8.array.index = getelementptr inbounds [5 x {}], ptr %c.var, i32 0, i64 3, !dbg !12
// CHECK:STDOUT: %.loc14_40.10.array.index = getelementptr inbounds [5 x {}], ptr %c.var, i32 0, i64 4, !dbg !12
// CHECK:STDOUT: call void @llvm.memcpy.p0.p0.i64(ptr align 1 %c.var, ptr align 1 @array.1cb.loc14_41, i64 0, i1 false), !dbg !13
// CHECK:STDOUT: call void @llvm.lifetime.start.p0(i64 12, ptr %d.var), !dbg !7
// CHECK:STDOUT: %tuple.elem0.loc15.tuple.elem = getelementptr inbounds nuw { i32, i32, i32 }, ptr %d.var, i32 0, i32 0, !dbg !14
// CHECK:STDOUT: %tuple.elem1.loc15.tuple.elem = getelementptr inbounds nuw { i32, i32, i32 }, ptr %d.var, i32 0, i32 1, !dbg !14
// CHECK:STDOUT: %tuple.elem2.loc15.tuple.elem = getelementptr inbounds nuw { i32, i32, i32 }, ptr %d.var, i32 0, i32 2, !dbg !14
// CHECK:STDOUT: call void @llvm.memcpy.p0.p0.i64(ptr align 4 %d.var, ptr align 4 @tuple.loc15_37, i64 12, i1 false), !dbg !15
// CHECK:STDOUT: call void @llvm.lifetime.start.p0(i64 12, ptr %e.var), !dbg !7
// CHECK:STDOUT: %tuple.elem0.loc16.tuple.elem = getelementptr inbounds nuw { i32, i32, i32 }, ptr %d.var, i32 0, i32 0, !dbg !16
// CHECK:STDOUT: %.loc16_21.1 = load i32, ptr %tuple.elem0.loc16.tuple.elem, align 4, !dbg !16
// CHECK:STDOUT: %.loc16_21.2.array.index = getelementptr inbounds [3 x i32], ptr %e.var, i32 0, i64 0, !dbg !16
// CHECK:STDOUT: store i32 %.loc16_21.1, ptr %.loc16_21.2.array.index, align 4, !dbg !16
// CHECK:STDOUT: %tuple.elem1.loc16.tuple.elem = getelementptr inbounds nuw { i32, i32, i32 }, ptr %d.var, i32 0, i32 1, !dbg !16
// CHECK:STDOUT: %.loc16_21.4 = load i32, ptr %tuple.elem1.loc16.tuple.elem, align 4, !dbg !16
// CHECK:STDOUT: %.loc16_21.5.array.index = getelementptr inbounds [3 x i32], ptr %e.var, i32 0, i64 1, !dbg !16
// CHECK:STDOUT: store i32 %.loc16_21.4, ptr %.loc16_21.5.array.index, align 4, !dbg !16
// CHECK:STDOUT: %tuple.elem2.loc16.tuple.elem = getelementptr inbounds nuw { i32, i32, i32 }, ptr %d.var, i32 0, i32 2, !dbg !16
// CHECK:STDOUT: %.loc16_21.7 = load i32, ptr %tuple.elem2.loc16.tuple.elem, align 4, !dbg !16
// CHECK:STDOUT: %.loc16_21.8.array.index = getelementptr inbounds [3 x i32], ptr %e.var, i32 0, i64 2, !dbg !16
// CHECK:STDOUT: store i32 %.loc16_21.7, ptr %.loc16_21.8.array.index, align 4, !dbg !16
// CHECK:STDOUT: ret void, !dbg !17
// CHECK:STDOUT: }
// CHECK:STDOUT:
// CHECK:STDOUT: ; Function Attrs: nocallback nofree nosync nounwind willreturn memory(argmem: readwrite)
// CHECK:STDOUT: declare void @llvm.lifetime.start.p0(i64 immarg, ptr nocapture) #0
// CHECK:STDOUT:
// CHECK:STDOUT: ; Function Attrs: nocallback nofree nounwind willreturn memory(argmem: readwrite)
// CHECK:STDOUT: declare void @llvm.memcpy.p0.p0.i64(ptr noalias nocapture writeonly, ptr noalias nocapture readonly, i64, i1 immarg) #1
// CHECK:STDOUT:
// CHECK:STDOUT: ; uselistorder directives
// CHECK:STDOUT: uselistorder i32 1, { 0, 2, 1, 3, 4, 5, 6, 7 }
// CHECK:STDOUT: uselistorder ptr @llvm.lifetime.start.p0, { 4, 3, 2, 1, 0 }
// CHECK:STDOUT: uselistorder ptr @llvm.memcpy.p0.p0.i64, { 3, 2, 1, 0 }
// CHECK:STDOUT:
// CHECK:STDOUT: attributes #0 = { nocallback nofree nosync nounwind willreturn memory(argmem: readwrite) }
// CHECK:STDOUT: attributes #1 = { nocallback nofree 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: "base.carbon", directory: "")
// CHECK:STDOUT: !4 = distinct !DISubprogram(name: "Run", linkageName: "main", scope: null, file: !3, line: 11, type: !5, spFlags: DISPFlagDefinition, unit: !2)
// CHECK:STDOUT: !5 = !DISubroutineType(types: !6)
// CHECK:STDOUT: !6 = !{}
// CHECK:STDOUT: !7 = !DILocation(line: 12, column: 7, scope: !4)
// CHECK:STDOUT: !8 = !DILocation(line: 12, column: 21, scope: !4)
// CHECK:STDOUT: !9 = !DILocation(line: 12, column: 3, scope: !4)
// CHECK:STDOUT: !10 = !DILocation(line: 13, column: 21, scope: !4)
// CHECK:STDOUT: !11 = !DILocation(line: 13, column: 3, scope: !4)
// CHECK:STDOUT: !12 = !DILocation(line: 14, column: 20, scope: !4)
// CHECK:STDOUT: !13 = !DILocation(line: 14, column: 3, scope: !4)
// CHECK:STDOUT: !14 = !DILocation(line: 15, column: 28, scope: !4)
// CHECK:STDOUT: !15 = !DILocation(line: 15, column: 3, scope: !4)
// CHECK:STDOUT: !16 = !DILocation(line: 16, column: 21, scope: !4)
// CHECK:STDOUT: !17 = !DILocation(line: 11, column: 1, scope: !4)
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