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carbon-lang/toolchain/lower/testdata/class/virtual.carbon
T
Richard Smith c04d62a7d1 Ensure that all allocas are created in the entry block. (#4685) 
Non-entry-block allocas will allocate new stack memory each time they're
reached, resulting in leaking stack memory over time for allocas in a
loop. Move all such allocas to the entry block instead, and use an LLVM
intrinsic to mark when the lifetime of the variable actually begins.
2024-12-17 00:55:06 +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/virtual.carbon
// TIP: To dump output, run:
// TIP: bazel run //toolchain/testing:file_test -- --dump_output --file_tests=toolchain/lower/testdata/class/virtual.carbon
// --- classes.carbon
package Classes;
base class Base {
}
base class Intermediate {
extend base: Base;
virtual fn Fn();
}
class Derived {
extend base: Intermediate;
impl fn Fn();
}
// --- create.carbon
package Create;
import Classes;
fn Create() {
var b: Classes.Base;
var i: Classes.Intermediate;
var d: Classes.Derived;
}
fn Use(v: Classes.Intermediate*) {
v->Fn();
}
// --- member_init.carbon
package MemberInit;
base class Base {
var m: i32;
virtual fn Fn();
}
fn Fn() {
var i: i32 = 3;
// TODO: make `i` initialize `m` here (it currently initializes the vptr instead)
var v: Base = {.m = i};
// TODO: fix crash here
// var v: Base = {.m = 3};
v.m = 5;
}
// CHECK:STDOUT: ; ModuleID = 'classes.carbon'
// CHECK:STDOUT: source_filename = "classes.carbon"
// CHECK:STDOUT:
// CHECK:STDOUT: declare void @_CFn.Intermediate.Classes()
// CHECK:STDOUT:
// CHECK:STDOUT: declare void @_CFn.Derived.Classes()
// 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: "classes.carbon", directory: "")
// CHECK:STDOUT: ; ModuleID = 'create.carbon'
// CHECK:STDOUT: source_filename = "create.carbon"
// CHECK:STDOUT:
// CHECK:STDOUT: define void @_CCreate.Create() !dbg !4 {
// CHECK:STDOUT: entry:
// CHECK:STDOUT: %b.var = alloca {}, align 8, !dbg !7
// CHECK:STDOUT: %i.var = alloca { ptr, {} }, align 8, !dbg !7
// CHECK:STDOUT: %d.var = alloca { { ptr, {} } }, align 8, !dbg !7
// CHECK:STDOUT: call void @llvm.lifetime.start.p0(i64 0, ptr %b.var), !dbg !7
// CHECK:STDOUT: call void @llvm.lifetime.start.p0(i64 8, ptr %i.var), !dbg !7
// CHECK:STDOUT: call void @llvm.lifetime.start.p0(i64 8, ptr %d.var), !dbg !7
// CHECK:STDOUT: ret void, !dbg !8
// CHECK:STDOUT: }
// CHECK:STDOUT:
// CHECK:STDOUT: define void @_CUse.Create(ptr %v) !dbg !9 {
// CHECK:STDOUT: entry:
// CHECK:STDOUT: call void @_CFn.Intermediate.Classes(), !dbg !10
// CHECK:STDOUT: ret void, !dbg !11
// CHECK:STDOUT: }
// CHECK:STDOUT:
// CHECK:STDOUT: declare void @_CFn.Intermediate.Classes()
// 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: ; uselistorder directives
// CHECK:STDOUT: uselistorder ptr @llvm.lifetime.start.p0, { 2, 1, 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: "create.carbon", directory: "")
// CHECK:STDOUT: !4 = distinct !DISubprogram(name: "Create", linkageName: "_CCreate.Create", scope: null, file: !3, line: 6, type: !5, spFlags: DISPFlagDefinition, unit: !2)
// CHECK:STDOUT: !5 = !DISubroutineType(types: !6)
// CHECK:STDOUT: !6 = !{}
// CHECK:STDOUT: !7 = !DILocation(line: 7, column: 7, scope: !4)
// CHECK:STDOUT: !8 = !DILocation(line: 6, column: 1, scope: !4)
// CHECK:STDOUT: !9 = distinct !DISubprogram(name: "Use", linkageName: "_CUse.Create", scope: null, file: !3, line: 12, type: !5, spFlags: DISPFlagDefinition, unit: !2)
// CHECK:STDOUT: !10 = !DILocation(line: 13, column: 3, scope: !9)
// CHECK:STDOUT: !11 = !DILocation(line: 12, column: 1, scope: !9)
// CHECK:STDOUT: ; ModuleID = 'member_init.carbon'
// CHECK:STDOUT: source_filename = "member_init.carbon"
// CHECK:STDOUT:
// CHECK:STDOUT: declare void @_CFn.Base.MemberInit()
// CHECK:STDOUT:
// CHECK:STDOUT: define void @_CFn.MemberInit() !dbg !4 {
// CHECK:STDOUT: entry:
// CHECK:STDOUT: %i.var = alloca i32, align 4, !dbg !7
// CHECK:STDOUT: %v.var = alloca { ptr, i32 }, align 8, !dbg !7
// CHECK:STDOUT: call void @llvm.lifetime.start.p0(i64 4, ptr %i.var), !dbg !7
// CHECK:STDOUT: store i32 3, ptr %i.var, align 4, !dbg !8
// CHECK:STDOUT: call void @llvm.lifetime.start.p0(i64 16, ptr %v.var), !dbg !7
// CHECK:STDOUT: %.loc12_24.2.vptr = getelementptr inbounds nuw { ptr, i32 }, ptr %v.var, i32 0, i32 0, !dbg !9
// CHECK:STDOUT: store ptr null, ptr %.loc12_24.2.vptr, align 8, !dbg !9
// CHECK:STDOUT: %.loc12_23 = load i32, ptr %i.var, align 4, !dbg !10
// CHECK:STDOUT: %.loc12_24.5.m = getelementptr inbounds nuw { ptr, i32 }, ptr %v.var, i32 0, i32 1, !dbg !9
// CHECK:STDOUT: store i32 %.loc12_23, ptr %.loc12_24.5.m, align 4, !dbg !9
// CHECK:STDOUT: %.loc15_4.m = getelementptr inbounds nuw { ptr, i32 }, ptr %v.var, i32 0, i32 1, !dbg !11
// CHECK:STDOUT: store i32 5, ptr %.loc15_4.m, align 4, !dbg !11
// CHECK:STDOUT: ret void, !dbg !12
// 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: ; 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:
// 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: "member_init.carbon", directory: "")
// CHECK:STDOUT: !4 = distinct !DISubprogram(name: "Fn", linkageName: "_CFn.MemberInit", 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: 7, scope: !4)
// CHECK:STDOUT: !8 = !DILocation(line: 10, column: 3, scope: !4)
// CHECK:STDOUT: !9 = !DILocation(line: 12, column: 17, scope: !4)
// CHECK:STDOUT: !10 = !DILocation(line: 12, column: 23, scope: !4)
// CHECK:STDOUT: !11 = !DILocation(line: 15, column: 3, scope: !4)
// CHECK:STDOUT: !12 = !DILocation(line: 9, column: 1, scope: !4)
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