mirror of
https://github.com/carbon-language/carbon-lang.git
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Fix mangling collision for C++ class template specializations (#7269)
Carbon-side thunks (for example the `Copy`/`Destroy` witness thunks generated for imported C++ types) are mangled by Carbon, and their names incorporate a fingerprint of the involved types. The instruction fingerprinter identifies a class only by its name and parent scope, which is sufficient for Carbon classes but not for imported C++ classes: different specializations of one class template (and other cases such as types in anonymous namespaces) share a Carbon name and parent scope. As a result, the thunks for two distinct specializations could mangle to the same name, producing a single LLVM function with two definitions and failing `verifyModule` during lowering. When fingerprinting a class imported from C++, also include the Clang mangled name of its type. Test: toolchain/lower/testdata/interop/cpp/thunks.carbon gains a split with two specializations of one class template, each requiring a thunk; their thunks now get distinct mangled names instead of colliding. Assisted-by: Claude Code --------- Co-authored-by: Christopher Di Bella <cjdb.ns@gmail.com>
This commit is contained in:
Chandler Carruth
co-authored by
Christopher Di Bella
Christopher Di Bella
parent
3ef128ac91
commit
8a59f2a76b
@@ -458,7 +458,7 @@ fn F() {
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// CHECK:STDOUT: %empty_tuple.type: type = tuple_type () [concrete]
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// CHECK:STDOUT: %foo.cpp_overload_set.type: type = cpp_overload_set_type @foo.cpp_overload_set [concrete]
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// CHECK:STDOUT: %foo.cpp_overload_set.value: %foo.cpp_overload_set.type = cpp_overload_set_value @foo.cpp_overload_set [concrete]
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// CHECK:STDOUT: %ptr.72b: type = ptr_type %U [concrete]
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// CHECK:STDOUT: %ptr.b3b: type = ptr_type %U [concrete]
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// CHECK:STDOUT: %foo__carbon_thunk.type: type = fn_type @foo__carbon_thunk [concrete]
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// CHECK:STDOUT: %foo__carbon_thunk: %foo__carbon_thunk.type = struct_value () [concrete]
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// CHECK:STDOUT: }
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@@ -484,7 +484,7 @@ fn F() {
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// CHECK:STDOUT: %foo.ref: %foo.cpp_overload_set.type = name_ref foo, imports.%foo.cpp_overload_set.value [concrete = constants.%foo.cpp_overload_set.value]
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// CHECK:STDOUT: %u.ref: %U = name_ref u, %u
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// CHECK:STDOUT: %.loc8: ref %U = value_as_ref %u.ref
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// CHECK:STDOUT: %addr: %ptr.72b = addr_of %.loc8
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// CHECK:STDOUT: %addr: %ptr.b3b = addr_of %.loc8
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// CHECK:STDOUT: %foo__carbon_thunk.call: init %empty_tuple.type = call imports.%foo__carbon_thunk.decl(%addr)
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// CHECK:STDOUT: <elided>
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// CHECK:STDOUT: }
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@@ -496,7 +496,7 @@ fn F() {
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// CHECK:STDOUT: %empty_tuple.type: type = tuple_type () [concrete]
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// CHECK:STDOUT: %foo.cpp_overload_set.type: type = cpp_overload_set_type @foo.cpp_overload_set [concrete]
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// CHECK:STDOUT: %foo.cpp_overload_set.value: %foo.cpp_overload_set.type = cpp_overload_set_value @foo.cpp_overload_set [concrete]
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// CHECK:STDOUT: %ptr.72b: type = ptr_type %U [concrete]
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// CHECK:STDOUT: %ptr.b3b: type = ptr_type %U [concrete]
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// CHECK:STDOUT: %foo__carbon_thunk.type: type = fn_type @foo__carbon_thunk [concrete]
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// CHECK:STDOUT: %foo__carbon_thunk: %foo__carbon_thunk.type = struct_value () [concrete]
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// CHECK:STDOUT: }
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@@ -522,7 +522,7 @@ fn F() {
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// CHECK:STDOUT: %foo.ref: %foo.cpp_overload_set.type = name_ref foo, imports.%foo.cpp_overload_set.value [concrete = constants.%foo.cpp_overload_set.value]
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// CHECK:STDOUT: %u.ref: %U = name_ref u, %u
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// CHECK:STDOUT: %.loc8: ref %U = value_as_ref %u.ref
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// CHECK:STDOUT: %addr: %ptr.72b = addr_of %.loc8
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// CHECK:STDOUT: %addr: %ptr.b3b = addr_of %.loc8
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// CHECK:STDOUT: %foo__carbon_thunk.call: init %empty_tuple.type = call imports.%foo__carbon_thunk.decl(%addr)
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// CHECK:STDOUT: <elided>
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// CHECK:STDOUT: }
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@@ -534,7 +534,7 @@ fn F() {
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// CHECK:STDOUT: %empty_tuple.type: type = tuple_type () [concrete]
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// CHECK:STDOUT: %foo.cpp_overload_set.type: type = cpp_overload_set_type @foo.cpp_overload_set [concrete]
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// CHECK:STDOUT: %foo.cpp_overload_set.value: %foo.cpp_overload_set.type = cpp_overload_set_value @foo.cpp_overload_set [concrete]
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// CHECK:STDOUT: %ptr.72b: type = ptr_type %U [concrete]
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// CHECK:STDOUT: %ptr.b3b: type = ptr_type %U [concrete]
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// CHECK:STDOUT: %foo__carbon_thunk.type: type = fn_type @foo__carbon_thunk [concrete]
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// CHECK:STDOUT: %foo__carbon_thunk: %foo__carbon_thunk.type = struct_value () [concrete]
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// CHECK:STDOUT: }
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@@ -560,7 +560,7 @@ fn F() {
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// CHECK:STDOUT: %foo.ref: %foo.cpp_overload_set.type = name_ref foo, imports.%foo.cpp_overload_set.value [concrete = constants.%foo.cpp_overload_set.value]
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// CHECK:STDOUT: %u.ref: %U = name_ref u, %u
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// CHECK:STDOUT: %.loc8: ref %U = value_as_ref %u.ref
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// CHECK:STDOUT: %addr: %ptr.72b = addr_of %.loc8
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// CHECK:STDOUT: %addr: %ptr.b3b = addr_of %.loc8
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// CHECK:STDOUT: %foo__carbon_thunk.call: init %empty_tuple.type = call imports.%foo__carbon_thunk.decl(%addr)
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// CHECK:STDOUT: <elided>
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// CHECK:STDOUT: }
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@@ -569,11 +569,11 @@ fn F() {
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// CHECK:STDOUT:
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// CHECK:STDOUT: constants {
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// CHECK:STDOUT: %U: type = class_type @U [concrete]
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// CHECK:STDOUT: %pattern_type.162: type = pattern_type %U [concrete]
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// CHECK:STDOUT: %pattern_type.769: type = pattern_type %U [concrete]
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// CHECK:STDOUT: %empty_tuple.type: type = tuple_type () [concrete]
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// CHECK:STDOUT: %foo.cpp_overload_set.type: type = cpp_overload_set_type @foo.cpp_overload_set [concrete]
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// CHECK:STDOUT: %foo.cpp_overload_set.value: %foo.cpp_overload_set.type = cpp_overload_set_value @foo.cpp_overload_set [concrete]
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// CHECK:STDOUT: %ptr.c47: type = ptr_type %U [concrete]
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// CHECK:STDOUT: %ptr.987: type = ptr_type %U [concrete]
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// CHECK:STDOUT: %foo__carbon_thunk.type: type = fn_type @foo__carbon_thunk [concrete]
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// CHECK:STDOUT: %foo__carbon_thunk: %foo__carbon_thunk.type = struct_value () [concrete]
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// CHECK:STDOUT: %DefaultOrUnformed.type: type = facet_type <@DefaultOrUnformed> [concrete]
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@@ -584,9 +584,9 @@ fn F() {
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// CHECK:STDOUT: %U.Op.type: type = fn_type @U.Op [concrete]
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// CHECK:STDOUT: %U.Op: %U.Op.type = struct_value () [concrete]
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// CHECK:STDOUT: %custom_witness.3d0: <witness> = custom_witness (%U.Op), @Default [concrete]
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// CHECK:STDOUT: %Default.facet.c27: %Default.type = facet_value %U, (%custom_witness.3d0) [concrete]
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// CHECK:STDOUT: %DefaultOrUnformed.impl_witness.f55: <witness> = impl_witness imports.%DefaultOrUnformed.impl_witness_table.b72, @T.as_type.as.DefaultOrUnformed.impl(%Default.facet.c27) [concrete]
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// CHECK:STDOUT: %DefaultOrUnformed.facet: %DefaultOrUnformed.type = facet_value %U, (%DefaultOrUnformed.impl_witness.f55) [concrete]
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// CHECK:STDOUT: %Default.facet.f66: %Default.type = facet_value %U, (%custom_witness.3d0) [concrete]
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// CHECK:STDOUT: %DefaultOrUnformed.impl_witness.9ec: <witness> = impl_witness imports.%DefaultOrUnformed.impl_witness_table.b72, @T.as_type.as.DefaultOrUnformed.impl(%Default.facet.f66) [concrete]
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// CHECK:STDOUT: %DefaultOrUnformed.facet: %DefaultOrUnformed.type = facet_value %U, (%DefaultOrUnformed.impl_witness.9ec) [concrete]
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// CHECK:STDOUT: %U.cpp_destructor.type: type = fn_type @U.cpp_destructor [concrete]
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// CHECK:STDOUT: %U.cpp_destructor: %U.cpp_destructor.type = struct_value () [concrete]
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// CHECK:STDOUT: }
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@@ -618,14 +618,14 @@ fn F() {
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// CHECK:STDOUT: %foo.ref: %foo.cpp_overload_set.type = name_ref foo, imports.%foo.cpp_overload_set.value [concrete = constants.%foo.cpp_overload_set.value]
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// CHECK:STDOUT: %u.ref: %U = name_ref u, %u
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// CHECK:STDOUT: %.loc8: ref %U = value_as_ref %u.ref
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// CHECK:STDOUT: %addr: %ptr.c47 = addr_of %.loc8
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// CHECK:STDOUT: %addr: %ptr.987 = addr_of %.loc8
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// CHECK:STDOUT: %foo__carbon_thunk.call: init %empty_tuple.type = call imports.%foo__carbon_thunk.decl(%addr)
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// CHECK:STDOUT: name_binding_decl {
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// CHECK:STDOUT: %x.patt: %pattern_type.162 = ref_binding_pattern x [concrete]
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// CHECK:STDOUT: %x.var_patt: %pattern_type.162 = var_pattern %x.patt [concrete]
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// CHECK:STDOUT: %x.patt: %pattern_type.769 = ref_binding_pattern x [concrete]
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// CHECK:STDOUT: %x.var_patt: %pattern_type.769 = var_pattern %x.patt [concrete]
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// CHECK:STDOUT: }
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// CHECK:STDOUT: %x.var: ref %U = var %x.var_patt
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// CHECK:STDOUT: %DefaultOrUnformed.facet: %DefaultOrUnformed.type = facet_value constants.%U, (constants.%DefaultOrUnformed.impl_witness.f55) [concrete = constants.%DefaultOrUnformed.facet]
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// CHECK:STDOUT: %DefaultOrUnformed.facet: %DefaultOrUnformed.type = facet_value constants.%U, (constants.%DefaultOrUnformed.impl_witness.9ec) [concrete = constants.%DefaultOrUnformed.facet]
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// CHECK:STDOUT: %.loc10_24.1: %DefaultOrUnformed.type = converted constants.%U, %DefaultOrUnformed.facet [concrete = constants.%DefaultOrUnformed.facet]
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// CHECK:STDOUT: %as_type: type = facet_access_type %.loc10_24.1 [concrete = constants.%U]
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// CHECK:STDOUT: %.loc10_24.2: type = converted %.loc10_24.1, %as_type [concrete = constants.%U]
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@@ -651,7 +651,7 @@ fn F() {
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// CHECK:STDOUT: %empty_tuple.type: type = tuple_type () [concrete]
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// CHECK:STDOUT: %foo.cpp_overload_set.type: type = cpp_overload_set_type @foo.cpp_overload_set [concrete]
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// CHECK:STDOUT: %foo.cpp_overload_set.value: %foo.cpp_overload_set.type = cpp_overload_set_value @foo.cpp_overload_set [concrete]
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// CHECK:STDOUT: %ptr.9be: type = ptr_type %U [concrete]
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// CHECK:STDOUT: %ptr.ff3: type = ptr_type %U [concrete]
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// CHECK:STDOUT: %foo__carbon_thunk.type: type = fn_type @foo__carbon_thunk [concrete]
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// CHECK:STDOUT: %foo__carbon_thunk: %foo__carbon_thunk.type = struct_value () [concrete]
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// CHECK:STDOUT: }
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@@ -686,7 +686,7 @@ fn F() {
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// CHECK:STDOUT: %foo.ref: %foo.cpp_overload_set.type = name_ref foo, imports.%foo.cpp_overload_set.value [concrete = constants.%foo.cpp_overload_set.value]
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// CHECK:STDOUT: %u.ref: %U = name_ref u, %u
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// CHECK:STDOUT: %.loc8: ref %U = value_as_ref %u.ref
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// CHECK:STDOUT: %addr: %ptr.9be = addr_of %.loc8
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// CHECK:STDOUT: %addr: %ptr.ff3 = addr_of %.loc8
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// CHECK:STDOUT: %foo__carbon_thunk.call: init %empty_tuple.type = call imports.%foo__carbon_thunk.decl(%addr)
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// CHECK:STDOUT: <elided>
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// CHECK:STDOUT: }
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@@ -699,10 +699,10 @@ fn F() {
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// CHECK:STDOUT: %U: type = class_type @U [concrete]
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// CHECK:STDOUT: %foo.cpp_overload_set.type: type = cpp_overload_set_type @foo.cpp_overload_set [concrete]
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// CHECK:STDOUT: %foo.cpp_overload_set.value: %foo.cpp_overload_set.type = cpp_overload_set_value @foo.cpp_overload_set [concrete]
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// CHECK:STDOUT: %ptr.676: type = ptr_type %U [concrete]
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// CHECK:STDOUT: %ptr.5aa: type = ptr_type %U [concrete]
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// CHECK:STDOUT: %foo__carbon_thunk.type: type = fn_type @foo__carbon_thunk [concrete]
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// CHECK:STDOUT: %foo__carbon_thunk: %foo__carbon_thunk.type = struct_value () [concrete]
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// CHECK:STDOUT: %pattern_type.194: type = pattern_type %O [concrete]
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// CHECK:STDOUT: %pattern_type.554: type = pattern_type %O [concrete]
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// CHECK:STDOUT: %DefaultOrUnformed.type: type = facet_type <@DefaultOrUnformed> [concrete]
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// CHECK:STDOUT: %Default.type: type = facet_type <@Default> [concrete]
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// CHECK:STDOUT: %T.4ca: %Default.type = symbolic_binding T, 0 [symbolic]
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@@ -711,9 +711,9 @@ fn F() {
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// CHECK:STDOUT: %O.Op.type: type = fn_type @O.Op [concrete]
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// CHECK:STDOUT: %O.Op: %O.Op.type = struct_value () [concrete]
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// CHECK:STDOUT: %custom_witness.213: <witness> = custom_witness (%O.Op), @Default [concrete]
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// CHECK:STDOUT: %Default.facet.15f: %Default.type = facet_value %O, (%custom_witness.213) [concrete]
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// CHECK:STDOUT: %DefaultOrUnformed.impl_witness.424: <witness> = impl_witness imports.%DefaultOrUnformed.impl_witness_table.b72, @T.as_type.as.DefaultOrUnformed.impl(%Default.facet.15f) [concrete]
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// CHECK:STDOUT: %DefaultOrUnformed.facet: %DefaultOrUnformed.type = facet_value %O, (%DefaultOrUnformed.impl_witness.424) [concrete]
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// CHECK:STDOUT: %Default.facet.478: %Default.type = facet_value %O, (%custom_witness.213) [concrete]
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// CHECK:STDOUT: %DefaultOrUnformed.impl_witness.1cc: <witness> = impl_witness imports.%DefaultOrUnformed.impl_witness_table.b72, @T.as_type.as.DefaultOrUnformed.impl(%Default.facet.478) [concrete]
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// CHECK:STDOUT: %DefaultOrUnformed.facet: %DefaultOrUnformed.type = facet_value %O, (%DefaultOrUnformed.impl_witness.1cc) [concrete]
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// CHECK:STDOUT: %O.cpp_destructor.type: type = fn_type @O.cpp_destructor [concrete]
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// CHECK:STDOUT: %O.cpp_destructor: %O.cpp_destructor.type = struct_value () [concrete]
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// CHECK:STDOUT: }
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@@ -741,14 +741,14 @@ fn F() {
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// CHECK:STDOUT: %foo.ref: %foo.cpp_overload_set.type = name_ref foo, imports.%foo.cpp_overload_set.value [concrete = constants.%foo.cpp_overload_set.value]
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// CHECK:STDOUT: %u.ref: %U = name_ref u, %u
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// CHECK:STDOUT: %.loc8: ref %U = value_as_ref %u.ref
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// CHECK:STDOUT: %addr: %ptr.676 = addr_of %.loc8
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// CHECK:STDOUT: %addr: %ptr.5aa = addr_of %.loc8
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// CHECK:STDOUT: %foo__carbon_thunk.call: init %empty_tuple.type = call imports.%foo__carbon_thunk.decl(%addr)
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// CHECK:STDOUT: name_binding_decl {
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// CHECK:STDOUT: %x.patt: %pattern_type.194 = ref_binding_pattern x [concrete]
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// CHECK:STDOUT: %x.var_patt: %pattern_type.194 = var_pattern %x.patt [concrete]
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// CHECK:STDOUT: %x.patt: %pattern_type.554 = ref_binding_pattern x [concrete]
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// CHECK:STDOUT: %x.var_patt: %pattern_type.554 = var_pattern %x.patt [concrete]
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// CHECK:STDOUT: }
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// CHECK:STDOUT: %x.var: ref %O = var %x.var_patt
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// CHECK:STDOUT: %DefaultOrUnformed.facet: %DefaultOrUnformed.type = facet_value constants.%O, (constants.%DefaultOrUnformed.impl_witness.424) [concrete = constants.%DefaultOrUnformed.facet]
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// CHECK:STDOUT: %DefaultOrUnformed.facet: %DefaultOrUnformed.type = facet_value constants.%O, (constants.%DefaultOrUnformed.impl_witness.1cc) [concrete = constants.%DefaultOrUnformed.facet]
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// CHECK:STDOUT: %.loc9_22.1: %DefaultOrUnformed.type = converted constants.%O, %DefaultOrUnformed.facet [concrete = constants.%DefaultOrUnformed.facet]
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// CHECK:STDOUT: %as_type: type = facet_access_type %.loc9_22.1 [concrete = constants.%O]
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// CHECK:STDOUT: %.loc9_22.2: type = converted %.loc9_22.1, %as_type [concrete = constants.%O]
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@@ -777,7 +777,7 @@ fn F() {
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// CHECK:STDOUT: %U.bar: %U.bar.type = struct_value () [concrete]
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// CHECK:STDOUT: %foo.cpp_overload_set.type: type = cpp_overload_set_type @foo.cpp_overload_set [concrete]
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// CHECK:STDOUT: %foo.cpp_overload_set.value: %foo.cpp_overload_set.type = cpp_overload_set_value @foo.cpp_overload_set [concrete]
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// CHECK:STDOUT: %ptr.72b: type = ptr_type %U [concrete]
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// CHECK:STDOUT: %ptr.b3b: type = ptr_type %U [concrete]
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// CHECK:STDOUT: %foo__carbon_thunk.type: type = fn_type @foo__carbon_thunk [concrete]
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// CHECK:STDOUT: %foo__carbon_thunk: %foo__carbon_thunk.type = struct_value () [concrete]
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// CHECK:STDOUT: }
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@@ -809,7 +809,7 @@ fn F() {
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// CHECK:STDOUT: %foo.ref: %foo.cpp_overload_set.type = name_ref foo, imports.%foo.cpp_overload_set.value [concrete = constants.%foo.cpp_overload_set.value]
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// CHECK:STDOUT: %u.ref: %U = name_ref u, %u
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// CHECK:STDOUT: %.loc9: ref %U = value_as_ref %u.ref
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// CHECK:STDOUT: %addr: %ptr.72b = addr_of %.loc9
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// CHECK:STDOUT: %addr: %ptr.b3b = addr_of %.loc9
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// CHECK:STDOUT: %foo__carbon_thunk.call: init %empty_tuple.type = call imports.%foo__carbon_thunk.decl(%addr)
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// CHECK:STDOUT: <elided>
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// CHECK:STDOUT: }
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@@ -821,7 +821,7 @@ fn F() {
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// CHECK:STDOUT: %empty_tuple.type: type = tuple_type () [concrete]
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// CHECK:STDOUT: %foo.cpp_overload_set.type: type = cpp_overload_set_type @foo.cpp_overload_set [concrete]
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// CHECK:STDOUT: %foo.cpp_overload_set.value: %foo.cpp_overload_set.type = cpp_overload_set_value @foo.cpp_overload_set [concrete]
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// CHECK:STDOUT: %ptr.72b: type = ptr_type %U [concrete]
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// CHECK:STDOUT: %ptr.b3b: type = ptr_type %U [concrete]
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// CHECK:STDOUT: %foo__carbon_thunk.type: type = fn_type @foo__carbon_thunk [concrete]
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// CHECK:STDOUT: %foo__carbon_thunk: %foo__carbon_thunk.type = struct_value () [concrete]
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// CHECK:STDOUT: %U.bar.cpp_overload_set.type: type = cpp_overload_set_type @U.bar.cpp_overload_set [concrete]
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@@ -853,7 +853,7 @@ fn F() {
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// CHECK:STDOUT: %foo.ref: %foo.cpp_overload_set.type = name_ref foo, imports.%foo.cpp_overload_set.value [concrete = constants.%foo.cpp_overload_set.value]
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// CHECK:STDOUT: %u.ref: %U = name_ref u, %u
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// CHECK:STDOUT: %.loc8: ref %U = value_as_ref %u.ref
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// CHECK:STDOUT: %addr: %ptr.72b = addr_of %.loc8
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// CHECK:STDOUT: %addr: %ptr.b3b = addr_of %.loc8
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// CHECK:STDOUT: %foo__carbon_thunk.call: init %empty_tuple.type = call imports.%foo__carbon_thunk.decl(%addr)
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// CHECK:STDOUT: %Cpp.ref.loc9: <namespace> = name_ref Cpp, imports.%Cpp [concrete = imports.%Cpp]
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// CHECK:STDOUT: %U.ref.loc9: type = name_ref U, imports.%U.decl [concrete = constants.%U]
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@@ -941,7 +941,7 @@ fn F() {
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// CHECK:STDOUT: %foo.cpp_overload_set.type: type = cpp_overload_set_type @foo.cpp_overload_set [concrete]
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// CHECK:STDOUT: %foo.cpp_overload_set.value: %foo.cpp_overload_set.type = cpp_overload_set_value @foo.cpp_overload_set [concrete]
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// CHECK:STDOUT: %U: type = class_type @U [concrete]
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// CHECK:STDOUT: %ptr.72b: type = ptr_type %U [concrete]
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// CHECK:STDOUT: %ptr.b3b: type = ptr_type %U [concrete]
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// CHECK:STDOUT: %foo__carbon_thunk.type: type = fn_type @foo__carbon_thunk [concrete]
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// CHECK:STDOUT: %foo__carbon_thunk: %foo__carbon_thunk.type = struct_value () [concrete]
|
||||
// CHECK:STDOUT: %U.cpp_destructor.type: type = fn_type @U.cpp_destructor [concrete]
|
||||
@@ -966,7 +966,7 @@ fn F() {
|
||||
// CHECK:STDOUT: %Cpp.ref: <namespace> = name_ref Cpp, imports.%Cpp [concrete = imports.%Cpp]
|
||||
// CHECK:STDOUT: %foo.ref: %foo.cpp_overload_set.type = name_ref foo, imports.%foo.cpp_overload_set.value [concrete = constants.%foo.cpp_overload_set.value]
|
||||
// CHECK:STDOUT: %.loc8_11.1: ref %U = temporary_storage
|
||||
// CHECK:STDOUT: %addr: %ptr.72b = addr_of %.loc8_11.1
|
||||
// CHECK:STDOUT: %addr: %ptr.b3b = addr_of %.loc8_11.1
|
||||
// CHECK:STDOUT: %foo__carbon_thunk.call: init %empty_tuple.type = call imports.%foo__carbon_thunk.decl(%addr)
|
||||
// CHECK:STDOUT: %.loc8_11.2: init %U to %.loc8_11.1 = mark_in_place_init %foo__carbon_thunk.call
|
||||
// CHECK:STDOUT: %.loc8_11.3: ref %U = temporary %.loc8_11.1, %.loc8_11.2
|
||||
|
||||
Reference in New Issue
Block a user