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aa69a484eb0774d1b00107bc145bf46c0f871256
carbon-lang/toolchain/lower/testdata/interop/cpp/field.carbon
T
Richard SmithDana JansensChandler Carruth
 aa69a484eb Add support for running LLVM optimizer. (#6225) 
Adds a flag `--optimize=<mode>` that specifies what to optimize for:

* `--optimize=none` turns off the optimizer as much as possible, but
still respects always_inline.
* `--optimize=debug` aims to be the equivalent of `-Og` / `-O1`, and
provides optimizations that don't affect the ability to debug the
program. This is the default.
* `--optimize=size` optimizes for the size of the produced program, and
aims to be the equivalent of `-Oz`.
* `--optimize=speed` optimizes for the execution time of the produced
program, and aims to be the equivalent of `-O3`.

Following the approach taken by Clang, the optimization level feeds into
both the configuration of the LLVM pass pipeline and the attributes
added to function definitions generated by the frontend.

Optimization is performed in a new phase, `optimize`, which runs between
`lower` and `codegen`.

---------

Co-authored-by: Dana Jansens <danakj@orodu.net>
Co-authored-by: Chandler Carruth <chandlerc@gmail.com>
2025-11-05 00:15:14 +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/int.carbon
//
// AUTOUPDATE
// TIP: To test this file alone, run:
// TIP: bazel test //toolchain/testing:file_test --test_arg=--file_tests=toolchain/lower/testdata/interop/cpp/field.carbon
// TIP: To dump output, run:
// TIP: bazel run //toolchain/testing:file_test -- --dump_output --file_tests=toolchain/lower/testdata/interop/cpp/field.carbon
// --- struct.h
struct A {
int n;
alignas(16) int m;
};
// --- access_struct.carbon
library "[[@TEST_NAME]]";
import Cpp library "struct.h";
// TODO: We generate 4-byte-aligned loads here, and should generate
// 16-byte-aligned loads as Clang does.
fn AccessN(a: Cpp.A) -> i32 {
return a.n;
}
fn AccessM(a: Cpp.A) -> i32 {
return a.m;
}
// --- assign_struct.carbon
library "[[@TEST_NAME]]";
import Cpp library "struct.h";
// TODO: We generate 4-byte-aligned stores here, and should generate
// 16-byte-aligned stores as Clang does.
fn AssignN(p: Cpp.A*) {
p->n = 1;
}
fn AssignM(p: Cpp.A*) {
p->m = 1;
}
// --- union.h
union A {
int n;
int m;
};
// --- access_union.carbon
library "[[@TEST_NAME]]";
import Cpp library "union.h";
fn AccessN(a: Cpp.A) -> i32 {
return a.n;
}
fn AccessM(a: Cpp.A) -> i32 {
return a.m;
}
// --- assign_union.carbon
library "[[@TEST_NAME]]";
import Cpp library "union.h";
fn AssignN(p: Cpp.A*) {
p->n = 1;
}
fn AssignM(p: Cpp.A*) {
p->m = 1;
}
// --- anon_union.h
struct A {
int x;
union {
int n;
int *_Nonnull p;
};
};
// --- access_anon_union.carbon
library "[[@TEST_NAME]]";
import Cpp library "anon_union.h";
fn AccessN(a: Cpp.A) -> i32 {
return a.n;
}
fn AccessP(a: Cpp.A) -> i32 {
return *a.p;
}
// CHECK:STDOUT: ; ModuleID = 'access_struct.carbon'
// CHECK:STDOUT: source_filename = "access_struct.carbon"
// CHECK:STDOUT: target datalayout = "e-m:e-p270:32:32-p271:32:32-p272:64:64-i64:64-i128:128-f80:128-n8:16:32:64-S128"
// CHECK:STDOUT: target triple = "x86_64-unknown-linux-gnu"
// CHECK:STDOUT:
// CHECK:STDOUT: ; Function Attrs: nounwind
// CHECK:STDOUT: define i32 @_CAccessN.Main(ptr %a) #0 !dbg !7 {
// CHECK:STDOUT: entry:
// CHECK:STDOUT: %.loc9_11.1.n = getelementptr inbounds nuw [32 x i8], ptr %a, i32 0, i32 0, !dbg !10
// CHECK:STDOUT: %.loc9_11.2 = load i32, ptr %.loc9_11.1.n, align 4, !dbg !10
// CHECK:STDOUT: ret i32 %.loc9_11.2, !dbg !11
// CHECK:STDOUT: }
// CHECK:STDOUT:
// CHECK:STDOUT: ; Function Attrs: nounwind
// CHECK:STDOUT: define i32 @_CAccessM.Main(ptr %a) #0 !dbg !12 {
// CHECK:STDOUT: entry:
// CHECK:STDOUT: %.loc13_11.1.m = getelementptr inbounds nuw [32 x i8], ptr %a, i32 0, i32 16, !dbg !13
// CHECK:STDOUT: %.loc13_11.2 = load i32, ptr %.loc13_11.1.m, align 4, !dbg !13
// CHECK:STDOUT: ret i32 %.loc13_11.2, !dbg !14
// CHECK:STDOUT: }
// CHECK:STDOUT:
// CHECK:STDOUT: attributes #0 = { nounwind }
// CHECK:STDOUT:
// CHECK:STDOUT: !llvm.module.flags = !{!0, !1, !2, !3, !4}
// CHECK:STDOUT: !llvm.dbg.cu = !{!5}
// CHECK:STDOUT:
// CHECK:STDOUT: !0 = !{i32 7, !"Dwarf Version", i32 5}
// CHECK:STDOUT: !1 = !{i32 2, !"Debug Info Version", i32 3}
// CHECK:STDOUT: !2 = !{i32 1, !"wchar_size", i32 4}
// CHECK:STDOUT: !3 = !{i32 8, !"PIC Level", i32 0}
// CHECK:STDOUT: !4 = !{i32 7, !"PIE Level", i32 2}
// CHECK:STDOUT: !5 = distinct !DICompileUnit(language: DW_LANG_C, file: !6, producer: "carbon", isOptimized: false, runtimeVersion: 0, emissionKind: FullDebug)
// CHECK:STDOUT: !6 = !DIFile(filename: "access_struct.carbon", directory: "")
// CHECK:STDOUT: !7 = distinct !DISubprogram(name: "AccessN", linkageName: "_CAccessN.Main", scope: null, file: !6, line: 8, type: !8, spFlags: DISPFlagDefinition, unit: !5)
// CHECK:STDOUT: !8 = !DISubroutineType(types: !9)
// CHECK:STDOUT: !9 = !{}
// CHECK:STDOUT: !10 = !DILocation(line: 9, column: 10, scope: !7)
// CHECK:STDOUT: !11 = !DILocation(line: 9, column: 3, scope: !7)
// CHECK:STDOUT: !12 = distinct !DISubprogram(name: "AccessM", linkageName: "_CAccessM.Main", scope: null, file: !6, line: 12, type: !8, spFlags: DISPFlagDefinition, unit: !5)
// CHECK:STDOUT: !13 = !DILocation(line: 13, column: 10, scope: !12)
// CHECK:STDOUT: !14 = !DILocation(line: 13, column: 3, scope: !12)
// CHECK:STDOUT: ; ModuleID = 'assign_struct.carbon'
// CHECK:STDOUT: source_filename = "assign_struct.carbon"
// CHECK:STDOUT: target datalayout = "e-m:e-p270:32:32-p271:32:32-p272:64:64-i64:64-i128:128-f80:128-n8:16:32:64-S128"
// CHECK:STDOUT: target triple = "x86_64-unknown-linux-gnu"
// CHECK:STDOUT:
// CHECK:STDOUT: ; Function Attrs: nounwind
// CHECK:STDOUT: define void @_CAssignN.Main(ptr %p) #0 !dbg !7 {
// CHECK:STDOUT: entry:
// CHECK:STDOUT: %.loc9_4.2.n = getelementptr inbounds nuw [32 x i8], ptr %p, i32 0, i32 0, !dbg !10
// CHECK:STDOUT: store i32 1, ptr %.loc9_4.2.n, align 4, !dbg !10
// CHECK:STDOUT: ret void, !dbg !11
// CHECK:STDOUT: }
// CHECK:STDOUT:
// CHECK:STDOUT: ; Function Attrs: nounwind
// CHECK:STDOUT: define void @_CAssignM.Main(ptr %p) #0 !dbg !12 {
// CHECK:STDOUT: entry:
// CHECK:STDOUT: %.loc13_4.2.m = getelementptr inbounds nuw [32 x i8], ptr %p, i32 0, i32 16, !dbg !13
// CHECK:STDOUT: store i32 1, ptr %.loc13_4.2.m, align 4, !dbg !13
// CHECK:STDOUT: ret void, !dbg !14
// CHECK:STDOUT: }
// CHECK:STDOUT:
// CHECK:STDOUT: attributes #0 = { nounwind }
// CHECK:STDOUT:
// CHECK:STDOUT: !llvm.module.flags = !{!0, !1, !2, !3, !4}
// CHECK:STDOUT: !llvm.dbg.cu = !{!5}
// CHECK:STDOUT:
// CHECK:STDOUT: !0 = !{i32 7, !"Dwarf Version", i32 5}
// CHECK:STDOUT: !1 = !{i32 2, !"Debug Info Version", i32 3}
// CHECK:STDOUT: !2 = !{i32 1, !"wchar_size", i32 4}
// CHECK:STDOUT: !3 = !{i32 8, !"PIC Level", i32 0}
// CHECK:STDOUT: !4 = !{i32 7, !"PIE Level", i32 2}
// CHECK:STDOUT: !5 = distinct !DICompileUnit(language: DW_LANG_C, file: !6, producer: "carbon", isOptimized: false, runtimeVersion: 0, emissionKind: FullDebug)
// CHECK:STDOUT: !6 = !DIFile(filename: "assign_struct.carbon", directory: "")
// CHECK:STDOUT: !7 = distinct !DISubprogram(name: "AssignN", linkageName: "_CAssignN.Main", scope: null, file: !6, line: 8, type: !8, spFlags: DISPFlagDefinition, unit: !5)
// CHECK:STDOUT: !8 = !DISubroutineType(types: !9)
// CHECK:STDOUT: !9 = !{}
// CHECK:STDOUT: !10 = !DILocation(line: 9, column: 3, scope: !7)
// CHECK:STDOUT: !11 = !DILocation(line: 8, column: 1, scope: !7)
// CHECK:STDOUT: !12 = distinct !DISubprogram(name: "AssignM", linkageName: "_CAssignM.Main", scope: null, file: !6, line: 12, type: !8, spFlags: DISPFlagDefinition, unit: !5)
// CHECK:STDOUT: !13 = !DILocation(line: 13, column: 3, scope: !12)
// CHECK:STDOUT: !14 = !DILocation(line: 12, column: 1, scope: !12)
// CHECK:STDOUT: ; ModuleID = 'access_union.carbon'
// CHECK:STDOUT: source_filename = "access_union.carbon"
// CHECK:STDOUT: target datalayout = "e-m:e-p270:32:32-p271:32:32-p272:64:64-i64:64-i128:128-f80:128-n8:16:32:64-S128"
// CHECK:STDOUT: target triple = "x86_64-unknown-linux-gnu"
// CHECK:STDOUT:
// CHECK:STDOUT: ; Function Attrs: nounwind
// CHECK:STDOUT: define i32 @_CAccessN.Main(ptr %a) #0 !dbg !7 {
// CHECK:STDOUT: entry:
// CHECK:STDOUT: %.loc7_11.1.n = getelementptr inbounds nuw [4 x i8], ptr %a, i32 0, i32 0, !dbg !10
// CHECK:STDOUT: %.loc7_11.2 = load i32, ptr %.loc7_11.1.n, align 4, !dbg !10
// CHECK:STDOUT: ret i32 %.loc7_11.2, !dbg !11
// CHECK:STDOUT: }
// CHECK:STDOUT:
// CHECK:STDOUT: ; Function Attrs: nounwind
// CHECK:STDOUT: define i32 @_CAccessM.Main(ptr %a) #0 !dbg !12 {
// CHECK:STDOUT: entry:
// CHECK:STDOUT: %.loc11_11.1.m = getelementptr inbounds nuw [4 x i8], ptr %a, i32 0, i32 0, !dbg !13
// CHECK:STDOUT: %.loc11_11.2 = load i32, ptr %.loc11_11.1.m, align 4, !dbg !13
// CHECK:STDOUT: ret i32 %.loc11_11.2, !dbg !14
// CHECK:STDOUT: }
// CHECK:STDOUT:
// CHECK:STDOUT: attributes #0 = { nounwind }
// CHECK:STDOUT:
// CHECK:STDOUT: !llvm.module.flags = !{!0, !1, !2, !3, !4}
// CHECK:STDOUT: !llvm.dbg.cu = !{!5}
// CHECK:STDOUT:
// CHECK:STDOUT: !0 = !{i32 7, !"Dwarf Version", i32 5}
// CHECK:STDOUT: !1 = !{i32 2, !"Debug Info Version", i32 3}
// CHECK:STDOUT: !2 = !{i32 1, !"wchar_size", i32 4}
// CHECK:STDOUT: !3 = !{i32 8, !"PIC Level", i32 0}
// CHECK:STDOUT: !4 = !{i32 7, !"PIE Level", i32 2}
// CHECK:STDOUT: !5 = distinct !DICompileUnit(language: DW_LANG_C, file: !6, producer: "carbon", isOptimized: false, runtimeVersion: 0, emissionKind: FullDebug)
// CHECK:STDOUT: !6 = !DIFile(filename: "access_union.carbon", directory: "")
// CHECK:STDOUT: !7 = distinct !DISubprogram(name: "AccessN", linkageName: "_CAccessN.Main", scope: null, file: !6, line: 6, type: !8, spFlags: DISPFlagDefinition, unit: !5)
// CHECK:STDOUT: !8 = !DISubroutineType(types: !9)
// CHECK:STDOUT: !9 = !{}
// CHECK:STDOUT: !10 = !DILocation(line: 7, column: 10, scope: !7)
// CHECK:STDOUT: !11 = !DILocation(line: 7, column: 3, scope: !7)
// CHECK:STDOUT: !12 = distinct !DISubprogram(name: "AccessM", linkageName: "_CAccessM.Main", scope: null, file: !6, line: 10, type: !8, spFlags: DISPFlagDefinition, unit: !5)
// CHECK:STDOUT: !13 = !DILocation(line: 11, column: 10, scope: !12)
// CHECK:STDOUT: !14 = !DILocation(line: 11, column: 3, scope: !12)
// CHECK:STDOUT: ; ModuleID = 'assign_union.carbon'
// CHECK:STDOUT: source_filename = "assign_union.carbon"
// CHECK:STDOUT: target datalayout = "e-m:e-p270:32:32-p271:32:32-p272:64:64-i64:64-i128:128-f80:128-n8:16:32:64-S128"
// CHECK:STDOUT: target triple = "x86_64-unknown-linux-gnu"
// CHECK:STDOUT:
// CHECK:STDOUT: ; Function Attrs: nounwind
// CHECK:STDOUT: define void @_CAssignN.Main(ptr %p) #0 !dbg !7 {
// CHECK:STDOUT: entry:
// CHECK:STDOUT: %.loc7_4.2.n = getelementptr inbounds nuw [4 x i8], ptr %p, i32 0, i32 0, !dbg !10
// CHECK:STDOUT: store i32 1, ptr %.loc7_4.2.n, align 4, !dbg !10
// CHECK:STDOUT: ret void, !dbg !11
// CHECK:STDOUT: }
// CHECK:STDOUT:
// CHECK:STDOUT: ; Function Attrs: nounwind
// CHECK:STDOUT: define void @_CAssignM.Main(ptr %p) #0 !dbg !12 {
// CHECK:STDOUT: entry:
// CHECK:STDOUT: %.loc11_4.2.m = getelementptr inbounds nuw [4 x i8], ptr %p, i32 0, i32 0, !dbg !13
// CHECK:STDOUT: store i32 1, ptr %.loc11_4.2.m, align 4, !dbg !13
// CHECK:STDOUT: ret void, !dbg !14
// CHECK:STDOUT: }
// CHECK:STDOUT:
// CHECK:STDOUT: attributes #0 = { nounwind }
// CHECK:STDOUT:
// CHECK:STDOUT: !llvm.module.flags = !{!0, !1, !2, !3, !4}
// CHECK:STDOUT: !llvm.dbg.cu = !{!5}
// CHECK:STDOUT:
// CHECK:STDOUT: !0 = !{i32 7, !"Dwarf Version", i32 5}
// CHECK:STDOUT: !1 = !{i32 2, !"Debug Info Version", i32 3}
// CHECK:STDOUT: !2 = !{i32 1, !"wchar_size", i32 4}
// CHECK:STDOUT: !3 = !{i32 8, !"PIC Level", i32 0}
// CHECK:STDOUT: !4 = !{i32 7, !"PIE Level", i32 2}
// CHECK:STDOUT: !5 = distinct !DICompileUnit(language: DW_LANG_C, file: !6, producer: "carbon", isOptimized: false, runtimeVersion: 0, emissionKind: FullDebug)
// CHECK:STDOUT: !6 = !DIFile(filename: "assign_union.carbon", directory: "")
// CHECK:STDOUT: !7 = distinct !DISubprogram(name: "AssignN", linkageName: "_CAssignN.Main", scope: null, file: !6, line: 6, type: !8, spFlags: DISPFlagDefinition, unit: !5)
// CHECK:STDOUT: !8 = !DISubroutineType(types: !9)
// CHECK:STDOUT: !9 = !{}
// CHECK:STDOUT: !10 = !DILocation(line: 7, column: 3, scope: !7)
// CHECK:STDOUT: !11 = !DILocation(line: 6, column: 1, scope: !7)
// CHECK:STDOUT: !12 = distinct !DISubprogram(name: "AssignM", linkageName: "_CAssignM.Main", scope: null, file: !6, line: 10, type: !8, spFlags: DISPFlagDefinition, unit: !5)
// CHECK:STDOUT: !13 = !DILocation(line: 11, column: 3, scope: !12)
// CHECK:STDOUT: !14 = !DILocation(line: 10, column: 1, scope: !12)
// CHECK:STDOUT: ; ModuleID = 'access_anon_union.carbon'
// CHECK:STDOUT: source_filename = "access_anon_union.carbon"
// CHECK:STDOUT: target datalayout = "e-m:e-p270:32:32-p271:32:32-p272:64:64-i64:64-i128:128-f80:128-n8:16:32:64-S128"
// CHECK:STDOUT: target triple = "x86_64-unknown-linux-gnu"
// CHECK:STDOUT:
// CHECK:STDOUT: ; Function Attrs: nounwind
// CHECK:STDOUT: define i32 @_CAccessN.Main(ptr %a) #0 !dbg !7 {
// CHECK:STDOUT: entry:
// CHECK:STDOUT: %.loc7_11.1.n = getelementptr inbounds nuw [16 x i8], ptr %a, i32 0, i32 8, !dbg !10
// CHECK:STDOUT: %.loc7_11.2 = load i32, ptr %.loc7_11.1.n, align 4, !dbg !10
// CHECK:STDOUT: ret i32 %.loc7_11.2, !dbg !11
// CHECK:STDOUT: }
// CHECK:STDOUT:
// CHECK:STDOUT: ; Function Attrs: nounwind
// CHECK:STDOUT: define i32 @_CAccessP.Main(ptr %a) #0 !dbg !12 {
// CHECK:STDOUT: entry:
// CHECK:STDOUT: %.loc11_12.1.p = getelementptr inbounds nuw [16 x i8], ptr %a, i32 0, i32 8, !dbg !13
// CHECK:STDOUT: %.loc11_12.2 = load ptr, ptr %.loc11_12.1.p, align 8, !dbg !13
// CHECK:STDOUT: %.loc11_10.2 = load i32, ptr %.loc11_12.2, align 4, !dbg !14
// CHECK:STDOUT: ret i32 %.loc11_10.2, !dbg !15
// CHECK:STDOUT: }
// CHECK:STDOUT:
// CHECK:STDOUT: attributes #0 = { nounwind }
// CHECK:STDOUT:
// CHECK:STDOUT: !llvm.module.flags = !{!0, !1, !2, !3, !4}
// CHECK:STDOUT: !llvm.dbg.cu = !{!5}
// CHECK:STDOUT:
// CHECK:STDOUT: !0 = !{i32 7, !"Dwarf Version", i32 5}
// CHECK:STDOUT: !1 = !{i32 2, !"Debug Info Version", i32 3}
// CHECK:STDOUT: !2 = !{i32 1, !"wchar_size", i32 4}
// CHECK:STDOUT: !3 = !{i32 8, !"PIC Level", i32 0}
// CHECK:STDOUT: !4 = !{i32 7, !"PIE Level", i32 2}
// CHECK:STDOUT: !5 = distinct !DICompileUnit(language: DW_LANG_C, file: !6, producer: "carbon", isOptimized: false, runtimeVersion: 0, emissionKind: FullDebug)
// CHECK:STDOUT: !6 = !DIFile(filename: "access_anon_union.carbon", directory: "")
// CHECK:STDOUT: !7 = distinct !DISubprogram(name: "AccessN", linkageName: "_CAccessN.Main", scope: null, file: !6, line: 6, type: !8, spFlags: DISPFlagDefinition, unit: !5)
// CHECK:STDOUT: !8 = !DISubroutineType(types: !9)
// CHECK:STDOUT: !9 = !{}
// CHECK:STDOUT: !10 = !DILocation(line: 7, column: 10, scope: !7)
// CHECK:STDOUT: !11 = !DILocation(line: 7, column: 3, scope: !7)
// CHECK:STDOUT: !12 = distinct !DISubprogram(name: "AccessP", linkageName: "_CAccessP.Main", scope: null, file: !6, line: 10, type: !8, spFlags: DISPFlagDefinition, unit: !5)
// CHECK:STDOUT: !13 = !DILocation(line: 11, column: 11, scope: !12)
// CHECK:STDOUT: !14 = !DILocation(line: 11, column: 10, scope: !12)
// CHECK:STDOUT: !15 = !DILocation(line: 11, column: 3, scope: !12)
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