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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/interop/cpp/function_param_int16.carbon
Vendored
+16 -16
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@@ -1315,17 +1315,17 @@ fn F() {
// CHECK:STDOUT: !entry:
// CHECK:STDOUT: name_binding_decl {
// CHECK:STDOUT: %a.patt: %pattern_type.2f8 = binding_pattern a [concrete]
// CHECK:STDOUT: %.loc7_3.1: %pattern_type.2f8 = var_pattern %a.patt [concrete]
// CHECK:STDOUT: %a.var_patt: %pattern_type.2f8 = var_pattern %a.patt [concrete]
// CHECK:STDOUT: }
// CHECK:STDOUT: %a.var: ref %i16 = var a
// CHECK:STDOUT: %a.var: ref %i16 = var %a.var_patt
// CHECK:STDOUT: %int_1: Core.IntLiteral = int_value 1 [concrete = constants.%int_1.5b8]
// CHECK:STDOUT: %impl.elem0: %.236 = impl_witness_access constants.%ImplicitAs.impl_witness.97b, element0 [concrete = constants.%Convert.d0a]
// CHECK:STDOUT: %bound_method.loc7_3.1: <bound method> = bound_method %int_1, %impl.elem0 [concrete = constants.%Convert.bound]
// CHECK:STDOUT: %specific_fn: <specific function> = specific_function %impl.elem0, @Convert.2(constants.%int_16) [concrete = constants.%Convert.specific_fn]
// CHECK:STDOUT: %bound_method.loc7_3.2: <bound method> = bound_method %int_1, %specific_fn [concrete = constants.%bound_method]
// CHECK:STDOUT: %int.convert_checked: init %i16 = call %bound_method.loc7_3.2(%int_1) [concrete = constants.%int_1.f90]
// CHECK:STDOUT: %.loc7_3.2: init %i16 = converted %int_1, %int.convert_checked [concrete = constants.%int_1.f90]
// CHECK:STDOUT: assign %a.var, %.loc7_3.2
// CHECK:STDOUT: %.loc7_3: init %i16 = converted %int_1, %int.convert_checked [concrete = constants.%int_1.f90]
// CHECK:STDOUT: assign %a.var, %.loc7_3
// CHECK:STDOUT: %.loc7_10: type = splice_block %i16 [concrete = constants.%i16] {
// CHECK:STDOUT: %int_16: Core.IntLiteral = int_value 16 [concrete = constants.%int_16]
// CHECK:STDOUT: %i16: type = class_type @Int, @Int(constants.%int_16) [concrete = constants.%i16]
@@ -1400,17 +1400,17 @@ fn F() {
// CHECK:STDOUT: !entry:
// CHECK:STDOUT: name_binding_decl {
// CHECK:STDOUT: %a.patt: %pattern_type.2f8 = binding_pattern a [concrete]
// CHECK:STDOUT: %.loc7_3.1: %pattern_type.2f8 = var_pattern %a.patt [concrete]
// CHECK:STDOUT: %a.var_patt: %pattern_type.2f8 = var_pattern %a.patt [concrete]
// CHECK:STDOUT: }
// CHECK:STDOUT: %a.var: ref %i16 = var a
// CHECK:STDOUT: %a.var: ref %i16 = var %a.var_patt
// CHECK:STDOUT: %int_1: Core.IntLiteral = int_value 1 [concrete = constants.%int_1.5b8]
// CHECK:STDOUT: %impl.elem0: %.236 = impl_witness_access constants.%ImplicitAs.impl_witness.97b, element0 [concrete = constants.%Convert.d0a]
// CHECK:STDOUT: %bound_method.loc7_3.1: <bound method> = bound_method %int_1, %impl.elem0 [concrete = constants.%Convert.bound]
// CHECK:STDOUT: %specific_fn: <specific function> = specific_function %impl.elem0, @Convert.2(constants.%int_16) [concrete = constants.%Convert.specific_fn]
// CHECK:STDOUT: %bound_method.loc7_3.2: <bound method> = bound_method %int_1, %specific_fn [concrete = constants.%bound_method]
// CHECK:STDOUT: %int.convert_checked: init %i16 = call %bound_method.loc7_3.2(%int_1) [concrete = constants.%int_1.f90]
// CHECK:STDOUT: %.loc7_3.2: init %i16 = converted %int_1, %int.convert_checked [concrete = constants.%int_1.f90]
// CHECK:STDOUT: assign %a.var, %.loc7_3.2
// CHECK:STDOUT: %.loc7_3: init %i16 = converted %int_1, %int.convert_checked [concrete = constants.%int_1.f90]
// CHECK:STDOUT: assign %a.var, %.loc7_3
// CHECK:STDOUT: %.loc7_10: type = splice_block %i16 [concrete = constants.%i16] {
// CHECK:STDOUT: %int_16: Core.IntLiteral = int_value 16 [concrete = constants.%int_16]
// CHECK:STDOUT: %i16: type = class_type @Int, @Int(constants.%int_16) [concrete = constants.%i16]
@@ -1486,17 +1486,17 @@ fn F() {
// CHECK:STDOUT: !entry:
// CHECK:STDOUT: name_binding_decl {
// CHECK:STDOUT: %a.patt: %pattern_type.2f8 = binding_pattern a [concrete]
// CHECK:STDOUT: %.loc7_3.1: %pattern_type.2f8 = var_pattern %a.patt [concrete]
// CHECK:STDOUT: %a.var_patt: %pattern_type.2f8 = var_pattern %a.patt [concrete]
// CHECK:STDOUT: }
// CHECK:STDOUT: %a.var: ref %i16 = var a
// CHECK:STDOUT: %a.var: ref %i16 = var %a.var_patt
// CHECK:STDOUT: %int_1: Core.IntLiteral = int_value 1 [concrete = constants.%int_1.5b8]
// CHECK:STDOUT: %impl.elem0: %.236 = impl_witness_access constants.%ImplicitAs.impl_witness.97b, element0 [concrete = constants.%Convert.d0a]
// CHECK:STDOUT: %bound_method.loc7_3.1: <bound method> = bound_method %int_1, %impl.elem0 [concrete = constants.%Convert.bound]
// CHECK:STDOUT: %specific_fn: <specific function> = specific_function %impl.elem0, @Convert.2(constants.%int_16) [concrete = constants.%Convert.specific_fn]
// CHECK:STDOUT: %bound_method.loc7_3.2: <bound method> = bound_method %int_1, %specific_fn [concrete = constants.%bound_method]
// CHECK:STDOUT: %int.convert_checked: init %i16 = call %bound_method.loc7_3.2(%int_1) [concrete = constants.%int_1.f90]
// CHECK:STDOUT: %.loc7_3.2: init %i16 = converted %int_1, %int.convert_checked [concrete = constants.%int_1.f90]
// CHECK:STDOUT: assign %a.var, %.loc7_3.2
// CHECK:STDOUT: %.loc7_3: init %i16 = converted %int_1, %int.convert_checked [concrete = constants.%int_1.f90]
// CHECK:STDOUT: assign %a.var, %.loc7_3
// CHECK:STDOUT: %.loc7_10: type = splice_block %i16 [concrete = constants.%i16] {
// CHECK:STDOUT: %int_16: Core.IntLiteral = int_value 16 [concrete = constants.%int_16]
// CHECK:STDOUT: %i16: type = class_type @Int, @Int(constants.%int_16) [concrete = constants.%i16]
@@ -1573,17 +1573,17 @@ fn F() {
// CHECK:STDOUT: !entry:
// CHECK:STDOUT: name_binding_decl {
// CHECK:STDOUT: %a.patt: %pattern_type.2f8 = binding_pattern a [concrete]
// CHECK:STDOUT: %.loc7_3.1: %pattern_type.2f8 = var_pattern %a.patt [concrete]
// CHECK:STDOUT: %a.var_patt: %pattern_type.2f8 = var_pattern %a.patt [concrete]
// CHECK:STDOUT: }
// CHECK:STDOUT: %a.var: ref %i16 = var a
// CHECK:STDOUT: %a.var: ref %i16 = var %a.var_patt
// CHECK:STDOUT: %int_1: Core.IntLiteral = int_value 1 [concrete = constants.%int_1.5b8]
// CHECK:STDOUT: %impl.elem0: %.236 = impl_witness_access constants.%ImplicitAs.impl_witness.97b, element0 [concrete = constants.%Convert.d0a]
// CHECK:STDOUT: %bound_method.loc7_3.1: <bound method> = bound_method %int_1, %impl.elem0 [concrete = constants.%Convert.bound]
// CHECK:STDOUT: %specific_fn: <specific function> = specific_function %impl.elem0, @Convert.2(constants.%int_16) [concrete = constants.%Convert.specific_fn]
// CHECK:STDOUT: %bound_method.loc7_3.2: <bound method> = bound_method %int_1, %specific_fn [concrete = constants.%bound_method]
// CHECK:STDOUT: %int.convert_checked: init %i16 = call %bound_method.loc7_3.2(%int_1) [concrete = constants.%int_1.f90]
// CHECK:STDOUT: %.loc7_3.2: init %i16 = converted %int_1, %int.convert_checked [concrete = constants.%int_1.f90]
// CHECK:STDOUT: assign %a.var, %.loc7_3.2
// CHECK:STDOUT: %.loc7_3: init %i16 = converted %int_1, %int.convert_checked [concrete = constants.%int_1.f90]
// CHECK:STDOUT: assign %a.var, %.loc7_3
// CHECK:STDOUT: %.loc7_10: type = splice_block %i16 [concrete = constants.%i16] {
// CHECK:STDOUT: %int_16: Core.IntLiteral = int_value 16 [concrete = constants.%int_16]
// CHECK:STDOUT: %i16: type = class_type @Int, @Int(constants.%int_16) [concrete = constants.%i16]