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Implement support for copying C++ classes. (#6434)
When performing impl lookup for `Core.Copy` for a C++ class type, look for a copy constructor. If we find one, synthesize an impl witness that calls the constructor. This adds initial support for impl lookup to delegate to the C++ interop logic for queries involving C++ types. For now, we don't implement the rules from #6166 that compare a synthesized type structure for the C++ impl against the best Carbon type structure, but the framework for building that support is established here. Currently there is no caching of the lookup here, and we build unique `ImplWitnessTable`s for each lookup, which leads to each impl lookup producing a distinct facet value. This results in some errors in generic contexts; this will be addressed in follow-up changes. This PR aims only to support the non-generic case. --------- Co-authored-by: Dana Jansens <danakj@orodu.net> Co-authored-by: Carbon Infra Bot <carbon-external-infra@google.com>
This commit is contained in:
Richard Smith
co-authored by
Dana Jansens
Carbon Infra Bot
Dana Jansens
Carbon Infra Bot
parent
19660ccde0
commit
372f632d9d
@@ -35,6 +35,31 @@ fn F() {
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let c: Cpp.C = Cpp.C.C();
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}
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// ============================================================================
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// Copy constructor
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// ============================================================================
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// --- copy.h
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class Copy {
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public:
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Copy();
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Copy(const Copy&);
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private:
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int n;
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};
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// --- call_copy.carbon
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library "[[@TEST_NAME]]";
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import Cpp library "copy.h";
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fn Copy(c: Cpp.Copy) -> Cpp.Copy {
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return c;
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}
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// CHECK:STDOUT: ; ModuleID = 'import_default.carbon'
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// CHECK:STDOUT: source_filename = "import_default.carbon"
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// 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"
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@@ -112,3 +137,70 @@ fn F() {
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// CHECK:STDOUT: !9 = !{null}
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// CHECK:STDOUT: !10 = !DILocation(line: 7, column: 18, scope: !7)
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// CHECK:STDOUT: !11 = !DILocation(line: 6, column: 1, scope: !7)
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// CHECK:STDOUT: ; ModuleID = 'call_copy.carbon'
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// CHECK:STDOUT: source_filename = "call_copy.carbon"
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// 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"
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// CHECK:STDOUT: target triple = "x86_64-unknown-linux-gnu"
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// CHECK:STDOUT:
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// CHECK:STDOUT: ; Function Attrs: nounwind
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// CHECK:STDOUT: define void @_CCopy.Main(ptr sret([4 x i8]) %return, ptr %c) #0 !dbg !7 {
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// CHECK:STDOUT: entry:
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// CHECK:STDOUT: %.loc7_10.1.temp = alloca [4 x i8], align 1, !dbg !13
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// CHECK:STDOUT: call void @llvm.lifetime.start.p0(ptr %.loc7_10.1.temp), !dbg !13
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// CHECK:STDOUT: call void @_ZN4CopyC1ERKS_.carbon_thunk(ptr %c, ptr %return), !dbg !13
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// CHECK:STDOUT: ret void, !dbg !14
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// CHECK:STDOUT: }
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// CHECK:STDOUT:
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// CHECK:STDOUT: ; Function Attrs: alwaysinline nounwind
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// CHECK:STDOUT: define void @"_COp:thunk.Copy.Cpp"(ptr sret([4 x i8]) %return, ptr %self) #1 !dbg !15 {
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// CHECK:STDOUT: entry:
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// CHECK:STDOUT: call void @_ZN4CopyC1ERKS_.carbon_thunk(ptr %self, ptr %return), !dbg !18
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// CHECK:STDOUT: ret void, !dbg !18
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// CHECK:STDOUT: }
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// CHECK:STDOUT:
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// CHECK:STDOUT: ; Function Attrs: nocallback nofree nosync nounwind willreturn memory(argmem: readwrite)
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// CHECK:STDOUT: declare void @llvm.lifetime.start.p0(ptr captures(none)) #2
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// CHECK:STDOUT:
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// CHECK:STDOUT: ; Function Attrs: alwaysinline mustprogress
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// CHECK:STDOUT: define dso_local void @_ZN4CopyC1ERKS_.carbon_thunk(ptr %0, ptr %return) #3 {
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// CHECK:STDOUT: entry:
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// CHECK:STDOUT: %.addr = alloca ptr, align 8
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// CHECK:STDOUT: %return.addr = alloca ptr, align 8
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// CHECK:STDOUT: store ptr %0, ptr %.addr, align 8
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// CHECK:STDOUT: store ptr %return, ptr %return.addr, align 8
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// CHECK:STDOUT: %1 = load ptr, ptr %return.addr, align 8
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// CHECK:STDOUT: %2 = load ptr, ptr %.addr, align 8
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// CHECK:STDOUT: call void @_ZN4CopyC1ERKS_(ptr nonnull align 4 dereferenceable(4) %1, ptr nonnull align 4 dereferenceable(4) %2)
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// CHECK:STDOUT: ret void
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// CHECK:STDOUT: }
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// CHECK:STDOUT:
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// CHECK:STDOUT: declare void @_ZN4CopyC1ERKS_(ptr nonnull align 4 dereferenceable(4), ptr nonnull align 4 dereferenceable(4)) unnamed_addr #4
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// CHECK:STDOUT:
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// CHECK:STDOUT: attributes #0 = { nounwind }
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// CHECK:STDOUT: attributes #1 = { alwaysinline nounwind }
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// CHECK:STDOUT: attributes #2 = { nocallback nofree nosync nounwind willreturn memory(argmem: readwrite) }
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// CHECK:STDOUT: attributes #3 = { alwaysinline mustprogress "min-legal-vector-width"="0" "no-trapping-math"="true" "stack-protector-buffer-size"="0" "target-cpu"="x86-64" "target-features"="+cmov,+cx8,+fxsr,+mmx,+sse,+sse2,+x87" "tune-cpu"="generic" }
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// CHECK:STDOUT: attributes #4 = { "no-trapping-math"="true" "stack-protector-buffer-size"="0" "target-cpu"="x86-64" "target-features"="+cmov,+cx8,+fxsr,+mmx,+sse,+sse2,+x87" "tune-cpu"="generic" }
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// CHECK:STDOUT:
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// CHECK:STDOUT: !llvm.module.flags = !{!0, !1, !2, !3, !4}
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// CHECK:STDOUT: !llvm.dbg.cu = !{!5}
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// CHECK:STDOUT:
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// CHECK:STDOUT: !0 = !{i32 7, !"Dwarf Version", i32 5}
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// CHECK:STDOUT: !1 = !{i32 2, !"Debug Info Version", i32 3}
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// CHECK:STDOUT: !2 = !{i32 1, !"wchar_size", i32 4}
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// CHECK:STDOUT: !3 = !{i32 8, !"PIC Level", i32 0}
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// CHECK:STDOUT: !4 = !{i32 7, !"PIE Level", i32 2}
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// CHECK:STDOUT: !5 = distinct !DICompileUnit(language: DW_LANG_C_plus_plus, file: !6, producer: "carbon", isOptimized: false, runtimeVersion: 0, emissionKind: FullDebug)
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// CHECK:STDOUT: !6 = !DIFile(filename: "call_copy.carbon", directory: "")
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// CHECK:STDOUT: !7 = distinct !DISubprogram(name: "Copy", linkageName: "_CCopy.Main", scope: null, file: !6, line: 6, type: !8, spFlags: DISPFlagDefinition, unit: !5, retainedNodes: !11)
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// CHECK:STDOUT: !8 = !DISubroutineType(types: !9)
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// CHECK:STDOUT: !9 = !{!10, !10}
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// CHECK:STDOUT: !10 = !DIDerivedType(tag: DW_TAG_pointer_type, baseType: null, size: 8)
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// CHECK:STDOUT: !11 = !{!12}
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// CHECK:STDOUT: !12 = !DILocalVariable(arg: 1, scope: !7, type: !10)
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// CHECK:STDOUT: !13 = !DILocation(line: 7, column: 10, scope: !7)
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// CHECK:STDOUT: !14 = !DILocation(line: 7, column: 3, scope: !7)
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// CHECK:STDOUT: !15 = distinct !DISubprogram(name: "Op", linkageName: "_COp:thunk.Copy.Cpp", scope: null, file: !6, type: !8, spFlags: DISPFlagDefinition, unit: !5, retainedNodes: !16)
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// CHECK:STDOUT: !16 = !{!17}
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// CHECK:STDOUT: !17 = !DILocalVariable(arg: 1, scope: !15, type: !10)
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// CHECK:STDOUT: !18 = !DILocation(line: 0, scope: !15)
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