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Make {} as Class an initializing expression. (#6882)

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Previously we forced a temporary materialization, resulting in it being
treated as an ephemeral reference expression. This change allows

```carbon
var x: Class = {} as Class;
```

even when `Class` is not copyable.
This commit is contained in:
Richard Smith
2026-03-11 20:21:21 +00:00
committed by GitHub
parent 6ac561afe9
commit 2e5b195813
45 changed files with 592 additions and 740 deletions
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toolchain/lower/testdata/interop/cpp/reference.carbon
Vendored
+4 -4
View File
@@ -133,7 +133,7 @@ fn GetRefs() {
// 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: @C.val.loc19_18.3 = internal constant {} zeroinitializer
// CHECK:STDOUT: @C.val.loc19_20.1 = internal constant {} zeroinitializer
// CHECK:STDOUT:
// CHECK:STDOUT: ; Function Attrs: alwaysinline mustprogress uwtable
// CHECK:STDOUT: define dso_local void @_Z9TakeCRRefO1C.carbon_thunk(ptr noundef %0) #0 {
@@ -194,7 +194,7 @@ fn GetRefs() {
// CHECK:STDOUT: call void @llvm.lifetime.start.p0(ptr %c.var), !dbg !19
// CHECK:STDOUT: call void @_Z8TakeCRefR1C(ptr %c.var), !dbg !24
// CHECK:STDOUT: call void @llvm.lifetime.start.p0(ptr %.loc19_18.2.temp), !dbg !20
// CHECK:STDOUT: call void @llvm.memcpy.p0.p0.i64(ptr align 1 %.loc19_18.2.temp, ptr align 1 @C.val.loc19_18.3, i64 0, i1 false), !dbg !20
// CHECK:STDOUT: call void @llvm.memcpy.p0.p0.i64(ptr align 1 %.loc19_18.2.temp, ptr align 1 @C.val.loc19_20.1, i64 0, i1 false), !dbg !20
// CHECK:STDOUT: call void @_Z9TakeCRRefO1C.carbon_thunk(ptr %.loc19_18.2.temp), !dbg !25
// CHECK:STDOUT: call void @_Z13TakeConstCRefRK1C.carbon_thunk(ptr %c.var), !dbg !26
// CHECK:STDOUT: call void @llvm.lifetime.start.p0(ptr %n.var), !dbg !21
@@ -270,7 +270,7 @@ fn GetRefs() {
// CHECK:STDOUT:
// CHECK:STDOUT: %class.ForceThunk = type { i8 }
// CHECK:STDOUT:
// CHECK:STDOUT: @C.val.loc20_18.3 = internal constant {} zeroinitializer
// CHECK:STDOUT: @C.val.loc20_20.1 = internal constant {} zeroinitializer
// CHECK:STDOUT:
// CHECK:STDOUT: ; Function Attrs: alwaysinline mustprogress uwtable
// CHECK:STDOUT: define dso_local void @_Z8TakeCRefR1C10ForceThunk.carbon_thunk1(ptr noundef nonnull align 1 dereferenceable(1) %0) #0 {
@@ -361,7 +361,7 @@ fn GetRefs() {
// CHECK:STDOUT: call void @llvm.lifetime.start.p0(ptr %c.var), !dbg !21
// CHECK:STDOUT: call void @_Z8TakeCRefR1C10ForceThunk.carbon_thunk1(ptr %c.var), !dbg !26
// CHECK:STDOUT: call void @llvm.lifetime.start.p0(ptr %.loc20_18.2.temp), !dbg !22
// CHECK:STDOUT: call void @llvm.memcpy.p0.p0.i64(ptr align 1 %.loc20_18.2.temp, ptr align 1 @C.val.loc20_18.3, i64 0, i1 false), !dbg !22
// CHECK:STDOUT: call void @llvm.memcpy.p0.p0.i64(ptr align 1 %.loc20_18.2.temp, ptr align 1 @C.val.loc20_20.1, i64 0, i1 false), !dbg !22
// CHECK:STDOUT: call void @_Z9TakeCRRefRK1C10ForceThunk.carbon_thunk1(ptr %.loc20_18.2.temp), !dbg !27
// CHECK:STDOUT: call void @_Z13TakeConstCRefRK1C10ForceThunk.carbon_thunk1(ptr %c.var), !dbg !28
// CHECK:STDOUT: call void @llvm.lifetime.start.p0(ptr %n.var), !dbg !23
toolchain/lower/testdata/interop/cpp/template.carbon
Vendored
+4 -4
View File
@@ -263,7 +263,7 @@ fn Call3() {
// CHECK:STDOUT:
// CHECK:STDOUT: %class.X = type { i8 }
// CHECK:STDOUT:
// CHECK:STDOUT: @X.val.loc12_12.3 = internal constant {} zeroinitializer
// CHECK:STDOUT: @X.val.loc12_14.1 = internal constant {} zeroinitializer
// CHECK:STDOUT:
// CHECK:STDOUT: ; Function Attrs: alwaysinline mustprogress uwtable
// CHECK:STDOUT: define dso_local void @_Z3fooIJEEv1XDpT_.carbon_thunk(ptr noundef %0) #0 {
@@ -318,7 +318,7 @@ fn Call3() {
// CHECK:STDOUT: entry:
// CHECK:STDOUT: %.loc12_12.2.temp = alloca {}, align 8, !dbg !17
// CHECK:STDOUT: call void @llvm.lifetime.start.p0(ptr %.loc12_12.2.temp), !dbg !17
// CHECK:STDOUT: call void @llvm.memcpy.p0.p0.i64(ptr align 1 %.loc12_12.2.temp, ptr align 1 @X.val.loc12_12.3, i64 0, i1 false), !dbg !17
// CHECK:STDOUT: call void @llvm.memcpy.p0.p0.i64(ptr align 1 %.loc12_12.2.temp, ptr align 1 @X.val.loc12_14.1, i64 0, i1 false), !dbg !17
// CHECK:STDOUT: call void @_Z3fooIJEEv1XDpT_.carbon_thunk(ptr %.loc12_12.2.temp), !dbg !18
// CHECK:STDOUT: ret void, !dbg !19
// CHECK:STDOUT: }
@@ -328,7 +328,7 @@ fn Call3() {
// CHECK:STDOUT: entry:
// CHECK:STDOUT: %.loc18_12.2.temp = alloca {}, align 8, !dbg !21
// CHECK:STDOUT: call void @llvm.lifetime.start.p0(ptr %.loc18_12.2.temp), !dbg !21
// CHECK:STDOUT: call void @llvm.memcpy.p0.p0.i64(ptr align 1 %.loc18_12.2.temp, ptr align 1 @X.val.loc12_12.3, i64 0, i1 false), !dbg !21
// CHECK:STDOUT: call void @llvm.memcpy.p0.p0.i64(ptr align 1 %.loc18_12.2.temp, ptr align 1 @X.val.loc12_14.1, i64 0, i1 false), !dbg !21
// CHECK:STDOUT: call void @_Z3fooIJiEEv1XDpT_.carbon_thunk(ptr %.loc18_12.2.temp, i32 2), !dbg !22
// CHECK:STDOUT: ret void, !dbg !23
// CHECK:STDOUT: }
@@ -338,7 +338,7 @@ fn Call3() {
// CHECK:STDOUT: entry:
// CHECK:STDOUT: %.loc24_12.2.temp = alloca {}, align 8, !dbg !25
// CHECK:STDOUT: call void @llvm.lifetime.start.p0(ptr %.loc24_12.2.temp), !dbg !25
// CHECK:STDOUT: call void @llvm.memcpy.p0.p0.i64(ptr align 1 %.loc24_12.2.temp, ptr align 1 @X.val.loc12_12.3, i64 0, i1 false), !dbg !25
// CHECK:STDOUT: call void @llvm.memcpy.p0.p0.i64(ptr align 1 %.loc24_12.2.temp, ptr align 1 @X.val.loc12_14.1, i64 0, i1 false), !dbg !25
// CHECK:STDOUT: call void @_Z3fooIJiiEEv1XDpT_.carbon_thunk(ptr %.loc24_12.2.temp, i32 2, i32 3), !dbg !26
// CHECK:STDOUT: ret void, !dbg !27
// CHECK:STDOUT: }