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Improve lowering for global variables. (#5492)

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- Track the `VarPattern` instruction on the `VarStorage` instruction so
that it's available for name mangling.
- Mangle global variables based on the first binding name within their
pattern.
- Give global variables external rather than internal linkage, except if
they have no bindings whatsoever in their pattern.
- To support lowering references to bindings nested within a global var,
such as for `var (x: i32, b: i32)`, add some basic initial support for
reference constant expressions. Treat a global `var` as a reference
constant, and treat an aggregate access into a reference constant as a
reference constant.
This commit is contained in:
Richard Smith
2025-05-21 00:09:10 +00:00
committed by GitHub
parent 7c2a6ef0e9
commit 5b884ae14d
294 changed files with 2901 additions and 2133 deletions
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toolchain/check/testdata/pointer/basic.carbon
Vendored
+7 -7
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@@ -80,17 +80,17 @@ fn F() -> i32 {
// CHECK:STDOUT: !entry:
// CHECK:STDOUT: name_binding_decl {
// CHECK:STDOUT: %n.patt: %pattern_type.7ce = binding_pattern n [concrete]
// CHECK:STDOUT: %.loc12_3.1: %pattern_type.7ce = var_pattern %n.patt [concrete]
// CHECK:STDOUT: %n.var_patt: %pattern_type.7ce = var_pattern %n.patt [concrete]
// CHECK:STDOUT: }
// CHECK:STDOUT: %n.var: ref %i32 = var n
// CHECK:STDOUT: %n.var: ref %i32 = var %n.var_patt
// CHECK:STDOUT: %int_0: Core.IntLiteral = int_value 0 [concrete = constants.%int_0.5c6]
// CHECK:STDOUT: %impl.elem0: %.9c3 = impl_witness_access constants.%ImplicitAs.impl_witness.c75, element0 [concrete = constants.%Convert.956]
// CHECK:STDOUT: %bound_method.loc12_3.1: <bound method> = bound_method %int_0, %impl.elem0 [concrete = constants.%Convert.bound]
// CHECK:STDOUT: %specific_fn: <specific function> = specific_function %impl.elem0, @Convert.2(constants.%int_32) [concrete = constants.%Convert.specific_fn]
// CHECK:STDOUT: %bound_method.loc12_3.2: <bound method> = bound_method %int_0, %specific_fn [concrete = constants.%bound_method]
// CHECK:STDOUT: %int.convert_checked: init %i32 = call %bound_method.loc12_3.2(%int_0) [concrete = constants.%int_0.6a9]
// CHECK:STDOUT: %.loc12_3.2: init %i32 = converted %int_0, %int.convert_checked [concrete = constants.%int_0.6a9]
// CHECK:STDOUT: assign %n.var, %.loc12_3.2
// CHECK:STDOUT: %.loc12_3: init %i32 = converted %int_0, %int.convert_checked [concrete = constants.%int_0.6a9]
// CHECK:STDOUT: assign %n.var, %.loc12_3
// CHECK:STDOUT: %.loc12_10: type = splice_block %i32.loc12 [concrete = constants.%i32] {
// CHECK:STDOUT: %int_32.loc12: Core.IntLiteral = int_value 32 [concrete = constants.%int_32]
// CHECK:STDOUT: %i32.loc12: type = class_type @Int, @Int(constants.%int_32) [concrete = constants.%i32]
@@ -98,13 +98,13 @@ fn F() -> i32 {
// CHECK:STDOUT: %n: ref %i32 = bind_name n, %n.var
// CHECK:STDOUT: name_binding_decl {
// CHECK:STDOUT: %p.patt: %pattern_type.fe8 = binding_pattern p [concrete]
// CHECK:STDOUT: %.loc13_3: %pattern_type.fe8 = var_pattern %p.patt [concrete]
// CHECK:STDOUT: %p.var_patt: %pattern_type.fe8 = var_pattern %p.patt [concrete]
// CHECK:STDOUT: }
// CHECK:STDOUT: %p.var: ref %ptr.235 = var p
// CHECK:STDOUT: %p.var: ref %ptr.235 = var %p.var_patt
// CHECK:STDOUT: %n.ref: ref %i32 = name_ref n, %n
// CHECK:STDOUT: %addr: %ptr.235 = addr_of %n.ref
// CHECK:STDOUT: assign %p.var, %addr
// CHECK:STDOUT: %.loc13_13: type = splice_block %ptr [concrete = constants.%ptr.235] {
// CHECK:STDOUT: %.loc13: type = splice_block %ptr [concrete = constants.%ptr.235] {
// CHECK:STDOUT: %int_32.loc13: Core.IntLiteral = int_value 32 [concrete = constants.%int_32]
// CHECK:STDOUT: %i32.loc13: type = class_type @Int, @Int(constants.%int_32) [concrete = constants.%i32]
// CHECK:STDOUT: %ptr: type = ptr_type %i32.loc13 [concrete = constants.%ptr.235]