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Add an interface for initialization of vars without an explicit initializer (#6934)

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When a `var` is not explicitly given an initializer, initialize it in
one of two ways:

* If its type implements the new interface `Core.Default`, call
`Core.Default.Op` to initialize it.
* Otherwise, if its type implements `UnformedInit`, leave it in an
unformed state. For now, this is always an uninitialized state, but that
will change in the future.
* If neither of those apply, the `var` declaration is ill-formed.

This is a step towards implementing leads decision #6739 and proposals
#257 and #5913.

Assisted-by: Gemini 3.1 Pro via Antigravity

---------

Co-authored-by: Geoff Romer <gromer@google.com>
This commit is contained in:
Richard Smith
2026-03-19 23:46:06 +00:00
committed by GitHub
co-authored by Geoff Romer
parent fd2d210c63
commit ce50f181f1
146 changed files with 5226 additions and 3535 deletions
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toolchain/lower/testdata/function/generic/call_basic.carbon
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+8
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@@ -125,15 +125,19 @@ fn M() {
// CHECK:STDOUT: %H.call.loc31 = call i32 @_CH.Main.64ccbb8e5d9a0b8e(i32 %.loc31_8.4), !dbg !39
// CHECK:STDOUT: store i32 %H.call.loc31, ptr %.loc31_9.2.temp, align 4, !dbg !39
// CHECK:STDOUT: call void @llvm.lifetime.start.p0(ptr %var_f64.var), !dbg !40
// CHECK:STDOUT: store double poison, ptr %var_f64.var, align 8, !dbg !40
// CHECK:STDOUT: %.loc35_5 = load double, ptr %var_f64.var, align 8, !dbg !47
// CHECK:STDOUT: %H.call.loc35 = call double @_CH.Main.de5b400758c39a65(double %.loc35_5), !dbg !48
// CHECK:STDOUT: call void @llvm.lifetime.start.p0(ptr %ptr_i32.var), !dbg !41
// CHECK:STDOUT: store ptr poison, ptr %ptr_i32.var, align 8, !dbg !41
// CHECK:STDOUT: %.loc37_5 = load ptr, ptr %ptr_i32.var, align 8, !dbg !49
// CHECK:STDOUT: %H.call.loc37 = call ptr @_CH.Main.779b9c0f3b54a7f8(ptr %.loc37_5), !dbg !50
// CHECK:STDOUT: call void @llvm.lifetime.start.p0(ptr %ptr_f64.var), !dbg !42
// CHECK:STDOUT: store ptr poison, ptr %ptr_f64.var, align 8, !dbg !42
// CHECK:STDOUT: %.loc39_5 = load ptr, ptr %ptr_f64.var, align 8, !dbg !51
// CHECK:STDOUT: %H.call.loc39 = call ptr @_CH.Main.779b9c0f3b54a7f8(ptr %.loc39_5), !dbg !52
// CHECK:STDOUT: call void @llvm.lifetime.start.p0(ptr %ptr_i8.var), !dbg !43
// CHECK:STDOUT: store ptr poison, ptr %ptr_i8.var, align 8, !dbg !43
// CHECK:STDOUT: %.loc41_5 = load ptr, ptr %ptr_i8.var, align 8, !dbg !53
// CHECK:STDOUT: %H.call.loc41 = call ptr @_CH.Main.779b9c0f3b54a7f8(ptr %.loc41_5), !dbg !54
// CHECK:STDOUT: call void @llvm.lifetime.start.p0(ptr %c.var), !dbg !44
@@ -172,15 +176,19 @@ fn M() {
// CHECK:STDOUT: %H.call.loc31 = call double @_CH.Main.de5b400758c39a65(double %.loc31_8.4), !dbg !67
// CHECK:STDOUT: store double %H.call.loc31, ptr %.loc31_9.2.temp, align 8, !dbg !67
// CHECK:STDOUT: call void @llvm.lifetime.start.p0(ptr %var_f64.var), !dbg !68
// CHECK:STDOUT: store double poison, ptr %var_f64.var, align 8, !dbg !68
// CHECK:STDOUT: %.loc35_5 = load double, ptr %var_f64.var, align 8, !dbg !75
// CHECK:STDOUT: %H.call.loc35 = call double @_CH.Main.de5b400758c39a65(double %.loc35_5), !dbg !76
// CHECK:STDOUT: call void @llvm.lifetime.start.p0(ptr %ptr_i32.var), !dbg !69
// CHECK:STDOUT: store ptr poison, ptr %ptr_i32.var, align 8, !dbg !69
// CHECK:STDOUT: %.loc37_5 = load ptr, ptr %ptr_i32.var, align 8, !dbg !77
// CHECK:STDOUT: %H.call.loc37 = call ptr @_CH.Main.779b9c0f3b54a7f8(ptr %.loc37_5), !dbg !78
// CHECK:STDOUT: call void @llvm.lifetime.start.p0(ptr %ptr_f64.var), !dbg !70
// CHECK:STDOUT: store ptr poison, ptr %ptr_f64.var, align 8, !dbg !70
// CHECK:STDOUT: %.loc39_5 = load ptr, ptr %ptr_f64.var, align 8, !dbg !79
// CHECK:STDOUT: %H.call.loc39 = call ptr @_CH.Main.779b9c0f3b54a7f8(ptr %.loc39_5), !dbg !80
// CHECK:STDOUT: call void @llvm.lifetime.start.p0(ptr %ptr_i8.var), !dbg !71
// CHECK:STDOUT: store ptr poison, ptr %ptr_i8.var, align 8, !dbg !71
// CHECK:STDOUT: %.loc41_5 = load ptr, ptr %ptr_i8.var, align 8, !dbg !81
// CHECK:STDOUT: %H.call.loc41 = call ptr @_CH.Main.779b9c0f3b54a7f8(ptr %.loc41_5), !dbg !82
// CHECK:STDOUT: call void @llvm.lifetime.start.p0(ptr %c.var), !dbg !72