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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
Download Patch File Download Diff File Expand all files Collapse all files
toolchain/lower/testdata/function/generic/call_recursive_basic.carbon
Vendored
+7 -3
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@@ -28,15 +28,15 @@ fn F[T:! Core.Copy](x: T, count: i32) -> T {
fn M() {
var n: i32 = 0;
var m: f64 = 1.0;
var ptr_i32 : i32*;
var ptr_f64 : f64*;
var ptr_i32 : i32* = &n;
var ptr_f64 : f64* = &m;
F(n, 0);
F(m, 0);
F(ptr_i32, 0);
F(ptr_f64, 0);
var c: C;
var c: C = {};
F(c, 0);
}
@@ -66,7 +66,9 @@ fn M() {
// CHECK:STDOUT: call void @llvm.lifetime.start.p0(ptr %m.var), !dbg !15
// CHECK:STDOUT: store double 1.000000e+00, ptr %m.var, align 8, !dbg !15
// CHECK:STDOUT: call void @llvm.lifetime.start.p0(ptr %ptr_i32.var), !dbg !16
// CHECK:STDOUT: store ptr %n.var, ptr %ptr_i32.var, align 8, !dbg !16
// CHECK:STDOUT: call void @llvm.lifetime.start.p0(ptr %ptr_f64.var), !dbg !17
// CHECK:STDOUT: store ptr %m.var, ptr %ptr_f64.var, align 8, !dbg !17
// CHECK:STDOUT: %.loc34_5 = load i32, ptr %n.var, align 4, !dbg !20
// CHECK:STDOUT: %F.call.loc34 = call i32 @_CF.Main.64ccbb8e5d9a0b8e(i32 %.loc34_5, i32 0), !dbg !21
// CHECK:STDOUT: %.loc35_5 = load double, ptr %m.var, align 8, !dbg !22
@@ -76,6 +78,7 @@ fn M() {
// CHECK:STDOUT: %.loc37_5 = load ptr, ptr %ptr_f64.var, align 8, !dbg !26
// CHECK:STDOUT: %F.call.loc37 = call ptr @_CF.Main.779b9c0f3b54a7f8(ptr %.loc37_5, i32 0), !dbg !27
// CHECK:STDOUT: call void @llvm.lifetime.start.p0(ptr %c.var), !dbg !18
// CHECK:STDOUT: call void @llvm.memcpy.p0.p0.i64(ptr align 1 %c.var, ptr align 1 @C.val.loc15_51, i64 0, i1 false), !dbg !18
// CHECK:STDOUT: call void @llvm.lifetime.start.p0(ptr %.loc40_9.4.temp), !dbg !19
// CHECK:STDOUT: call void @_CF.Main.706e9f413f1bae3d(ptr %.loc40_9.4.temp, ptr %c.var, i32 0), !dbg !19
// CHECK:STDOUT: ret void, !dbg !28
@@ -149,6 +152,7 @@ fn M() {
// CHECK:STDOUT: }
// CHECK:STDOUT:
// CHECK:STDOUT: ; uselistorder directives
// CHECK:STDOUT: uselistorder ptr @llvm.memcpy.p0.p0.i64, { 1, 0 }
// CHECK:STDOUT: uselistorder ptr @llvm.lifetime.start.p0, { 5, 4, 3, 2, 1, 0 }
// CHECK:STDOUT: uselistorder ptr @_CF.Main.779b9c0f3b54a7f8, { 1, 2, 0 }
// CHECK:STDOUT: