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carbon-lang/toolchain/lower/testdata/class/field.carbon
T
David Blaikie 4739828cca Generalize non-const ClassInit lowering beyond only InitializeFrom insts (#5199) 
Fixes #5186

With @zygoloid's kind assistance, this generalizes the existing
non-const lowering of ClassInit, that had previously only handled
InitializeFrom, to find other cases - such as a nested ClassInit used to
initialize a class member.

This refactors the `FindReturnSlotArgForInitializer` from
`check/convert.cpp` into `sem_ir/file.{h,cpp}` for use from lowering
(since lower doesn't depend on check, which I assume is an intentional
layering constraint - so figured it made sense to move it to sem_ir, and
found one or two similar-ish utility functions in `sem_ir/file.{h,cpp}`,
so figured that was a good spot)
2025-04-01 18:45:07 +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/class/field.carbon
// TIP: To dump output, run:
// TIP: bazel run //toolchain/testing:file_test -- --dump_output --file_tests=toolchain/lower/testdata/class/field.carbon
// --- basic.carbon
library "[[@TEST_NAME]]";
class C {
var a: i32;
var b: C*;
}
fn F(c: C) -> i32 {
return (*c.b).a;
}
fn Run() -> i32 {
var c: C;
c.a = 1;
c.b = &c;
return F(c);
}
// --- inplace_init_with_nonconst.carbon
library "[[@TEST_NAME]]";
class Other { }
class Use {
var a: Other*;
var b: Other;
}
fn Run() {
var o: Other;
// .a is initialized with a non-constant expression
// .b is initialized with in-place class_init
var u: Use = {.a = &o, .b = {}};
}
// --- implicit_init_with_nonempty_nonconst.carbon
library "[[@TEST_NAME]]";
class Other {
var v: i32;
}
class Use {
var a: Other*;
var b: Other;
}
fn Run() {
var o: Other;
// .a is initialized with a non-constant expression
// .b is initialized with in-place class_init
var u: Use = {.a = &o, .b = {.v = 42}};
}
// CHECK:STDOUT: ; ModuleID = 'basic.carbon'
// CHECK:STDOUT: source_filename = "basic.carbon"
// CHECK:STDOUT:
// CHECK:STDOUT: define i32 @_CF.Main(ptr %c) !dbg !4 {
// CHECK:STDOUT: entry:
// CHECK:STDOUT: %.loc10_13.1.b = getelementptr inbounds nuw { i32, ptr }, ptr %c, i32 0, i32 1, !dbg !7
// CHECK:STDOUT: %.loc10_13.2 = load ptr, ptr %.loc10_13.1.b, align 8, !dbg !7
// CHECK:STDOUT: %.loc10_16.1.a = getelementptr inbounds nuw { i32, ptr }, ptr %.loc10_13.2, i32 0, i32 0, !dbg !8
// CHECK:STDOUT: %.loc10_16.2 = load i32, ptr %.loc10_16.1.a, align 4, !dbg !8
// CHECK:STDOUT: ret i32 %.loc10_16.2, !dbg !9
// CHECK:STDOUT: }
// CHECK:STDOUT:
// CHECK:STDOUT: define i32 @main() !dbg !10 {
// CHECK:STDOUT: entry:
// CHECK:STDOUT: %c.var = alloca { i32, ptr }, align 8, !dbg !11
// CHECK:STDOUT: call void @llvm.lifetime.start.p0(i64 16, ptr %c.var), !dbg !11
// CHECK:STDOUT: %.loc15_4.a = getelementptr inbounds nuw { i32, ptr }, ptr %c.var, i32 0, i32 0, !dbg !12
// CHECK:STDOUT: store i32 1, ptr %.loc15_4.a, align 4, !dbg !12
// CHECK:STDOUT: %.loc16.b = getelementptr inbounds nuw { i32, ptr }, ptr %c.var, i32 0, i32 1, !dbg !13
// CHECK:STDOUT: store ptr %c.var, ptr %.loc16.b, align 8, !dbg !13
// CHECK:STDOUT: %F.call = call i32 @_CF.Main(ptr %c.var), !dbg !14
// CHECK:STDOUT: ret i32 %F.call, !dbg !15
// 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 captures(none)) #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: "basic.carbon", directory: "")
// CHECK:STDOUT: !4 = distinct !DISubprogram(name: "F", linkageName: "_CF.Main", scope: null, file: !3, line: 9, type: !5, spFlags: DISPFlagDefinition, unit: !2)
// CHECK:STDOUT: !5 = !DISubroutineType(types: !6)
// CHECK:STDOUT: !6 = !{}
// CHECK:STDOUT: !7 = !DILocation(line: 10, column: 12, scope: !4)
// CHECK:STDOUT: !8 = !DILocation(line: 10, column: 10, scope: !4)
// CHECK:STDOUT: !9 = !DILocation(line: 10, column: 3, scope: !4)
// CHECK:STDOUT: !10 = distinct !DISubprogram(name: "Run", linkageName: "main", scope: null, file: !3, line: 13, type: !5, spFlags: DISPFlagDefinition, unit: !2)
// CHECK:STDOUT: !11 = !DILocation(line: 14, column: 3, scope: !10)
// CHECK:STDOUT: !12 = !DILocation(line: 15, column: 3, scope: !10)
// CHECK:STDOUT: !13 = !DILocation(line: 16, column: 3, scope: !10)
// CHECK:STDOUT: !14 = !DILocation(line: 17, column: 10, scope: !10)
// CHECK:STDOUT: !15 = !DILocation(line: 17, column: 3, scope: !10)
// CHECK:STDOUT: ; ModuleID = 'inplace_init_with_nonconst.carbon'
// CHECK:STDOUT: source_filename = "inplace_init_with_nonconst.carbon"
// CHECK:STDOUT:
// CHECK:STDOUT: @Other.val.loc15_33.5 = internal constant {} zeroinitializer
// CHECK:STDOUT:
// CHECK:STDOUT: define void @main() !dbg !4 {
// CHECK:STDOUT: entry:
// CHECK:STDOUT: %o.var = alloca {}, align 8, !dbg !7
// CHECK:STDOUT: %u.var = alloca { ptr, {} }, align 8, !dbg !7
// CHECK:STDOUT: call void @llvm.lifetime.start.p0(i64 0, ptr %o.var), !dbg !7
// CHECK:STDOUT: call void @llvm.lifetime.start.p0(i64 8, ptr %u.var), !dbg !7
// CHECK:STDOUT: %.loc15_33.2.a = getelementptr inbounds nuw { ptr, {} }, ptr %u.var, i32 0, i32 0, !dbg !8
// CHECK:STDOUT: store ptr %o.var, ptr %.loc15_33.2.a, align 8, !dbg !8
// CHECK:STDOUT: %.loc15_33.4.b = getelementptr inbounds nuw { ptr, {} }, ptr %u.var, i32 0, i32 1, !dbg !8
// CHECK:STDOUT: call void @llvm.memcpy.p0.p0.i64(ptr align 1 %.loc15_33.4.b, ptr align 1 @Other.val.loc15_33.5, i64 0, i1 false), !dbg !8
// CHECK:STDOUT: ret void, !dbg !9
// 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 captures(none)) #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 writeonly captures(none), ptr noalias readonly captures(none), i64, i1 immarg) #1
// CHECK:STDOUT:
// CHECK:STDOUT: ; uselistorder directives
// CHECK:STDOUT: uselistorder ptr @llvm.lifetime.start.p0, { 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: "inplace_init_with_nonconst.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: 3, scope: !4)
// CHECK:STDOUT: !8 = !DILocation(line: 15, column: 16, scope: !4)
// CHECK:STDOUT: !9 = !DILocation(line: 11, column: 1, scope: !4)
// CHECK:STDOUT: ; ModuleID = 'implicit_init_with_nonempty_nonconst.carbon'
// CHECK:STDOUT: source_filename = "implicit_init_with_nonempty_nonconst.carbon"
// CHECK:STDOUT:
// CHECK:STDOUT: @Other.val.loc17_40.5 = internal constant { i32 } { i32 42 }
// CHECK:STDOUT:
// CHECK:STDOUT: define void @main() !dbg !4 {
// CHECK:STDOUT: entry:
// CHECK:STDOUT: %o.var = alloca { i32 }, align 8, !dbg !7
// CHECK:STDOUT: %u.var = alloca { ptr, { i32 } }, align 8, !dbg !7
// CHECK:STDOUT: call void @llvm.lifetime.start.p0(i64 4, ptr %o.var), !dbg !7
// CHECK:STDOUT: call void @llvm.lifetime.start.p0(i64 16, ptr %u.var), !dbg !7
// CHECK:STDOUT: %.loc17_40.2.a = getelementptr inbounds nuw { ptr, { i32 } }, ptr %u.var, i32 0, i32 0, !dbg !8
// CHECK:STDOUT: store ptr %o.var, ptr %.loc17_40.2.a, align 8, !dbg !8
// CHECK:STDOUT: %.loc17_40.4.b = getelementptr inbounds nuw { ptr, { i32 } }, ptr %u.var, i32 0, i32 1, !dbg !8
// CHECK:STDOUT: %.loc17_39.3.v = getelementptr inbounds nuw { i32 }, ptr %.loc17_40.4.b, i32 0, i32 0, !dbg !9
// CHECK:STDOUT: call void @llvm.memcpy.p0.p0.i64(ptr align 4 %.loc17_40.4.b, ptr align 4 @Other.val.loc17_40.5, i64 4, i1 false), !dbg !8
// CHECK:STDOUT: ret void, !dbg !10
// 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 captures(none)) #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 writeonly captures(none), ptr noalias readonly captures(none), i64, i1 immarg) #1
// CHECK:STDOUT:
// CHECK:STDOUT: ; uselistorder directives
// CHECK:STDOUT: uselistorder ptr @llvm.lifetime.start.p0, { 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: "implicit_init_with_nonempty_nonconst.carbon", directory: "")
// CHECK:STDOUT: !4 = distinct !DISubprogram(name: "Run", linkageName: "main", scope: null, file: !3, line: 13, type: !5, spFlags: DISPFlagDefinition, unit: !2)
// CHECK:STDOUT: !5 = !DISubroutineType(types: !6)
// CHECK:STDOUT: !6 = !{}
// CHECK:STDOUT: !7 = !DILocation(line: 14, column: 3, scope: !4)
// CHECK:STDOUT: !8 = !DILocation(line: 17, column: 16, scope: !4)
// CHECK:STDOUT: !9 = !DILocation(line: 17, column: 31, scope: !4)
// CHECK:STDOUT: !10 = !DILocation(line: 13, column: 1, scope: !4)
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