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carbon-lang/toolchain/check/context.cpp
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// Part of the Carbon Language project, under the Apache License v2.0 with LLVM
// Exceptions. See /LICENSE for license information.
// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
#include "toolchain/check/context.h"
#include <optional>
#include <string>
#include <utility>
#include "common/check.h"
#include "common/vlog.h"
#include "llvm/ADT/Sequence.h"
#include "toolchain/base/kind_switch.h"
#include "toolchain/check/decl_name_stack.h"
#include "toolchain/check/eval.h"
#include "toolchain/check/generic.h"
#include "toolchain/check/generic_region_stack.h"
#include "toolchain/check/import.h"
#include "toolchain/check/import_ref.h"
#include "toolchain/check/inst_block_stack.h"
#include "toolchain/check/merge.h"
#include "toolchain/diagnostics/diagnostic_emitter.h"
#include "toolchain/diagnostics/format_providers.h"
#include "toolchain/lex/tokenized_buffer.h"
#include "toolchain/parse/node_ids.h"
#include "toolchain/parse/node_kind.h"
#include "toolchain/sem_ir/file.h"
#include "toolchain/sem_ir/formatter.h"
#include "toolchain/sem_ir/generic.h"
#include "toolchain/sem_ir/ids.h"
#include "toolchain/sem_ir/import_ir.h"
#include "toolchain/sem_ir/inst.h"
#include "toolchain/sem_ir/inst_kind.h"
#include "toolchain/sem_ir/name_scope.h"
#include "toolchain/sem_ir/type_info.h"
#include "toolchain/sem_ir/typed_insts.h"
namespace Carbon::Check {
Context::Context(DiagnosticEmitter* emitter,
llvm::function_ref<const Parse::TreeAndSubtrees&()>
get_parse_tree_and_subtrees,
SemIR::File* sem_ir, llvm::raw_ostream* vlog_stream)
: emitter_(emitter),
get_parse_tree_and_subtrees_(get_parse_tree_and_subtrees),
sem_ir_(sem_ir),
vlog_stream_(vlog_stream),
node_stack_(sem_ir->parse_tree(), vlog_stream),
inst_block_stack_("inst_block_stack_", *sem_ir, vlog_stream),
pattern_block_stack_("pattern_block_stack_", *sem_ir, vlog_stream),
param_and_arg_refs_stack_(*sem_ir, vlog_stream, node_stack_),
args_type_info_stack_("args_type_info_stack_", *sem_ir, vlog_stream),
decl_name_stack_(this),
scope_stack_(sem_ir_->identifiers()),
global_init_(this) {
// Map the builtin `<error>` and `type` type constants to their corresponding
// special `TypeId` values.
type_ids_for_type_constants_.Insert(
SemIR::ConstantId::ForTemplateConstant(SemIR::ErrorInst::SingletonInstId),
SemIR::ErrorInst::SingletonTypeId);
type_ids_for_type_constants_.Insert(
SemIR::ConstantId::ForTemplateConstant(SemIR::TypeType::SingletonInstId),
SemIR::TypeType::SingletonTypeId);
// TODO: Remove this and add a `VerifyOnFinish` once we properly push and pop
// in the right places.
generic_region_stack().Push();
}
auto Context::TODO(SemIRLoc loc, std::string label) -> bool {
CARBON_DIAGNOSTIC(SemanticsTodo, Error, "semantics TODO: `{0}`", std::string);
emitter_->Emit(loc, SemanticsTodo, std::move(label));
return false;
}
auto Context::VerifyOnFinish() -> void {
// Information in all the various context objects should be cleaned up as
// various pieces of context go out of scope. At this point, nothing should
// remain.
// node_stack_ will still contain top-level entities.
inst_block_stack_.VerifyOnFinish();
pattern_block_stack_.VerifyOnFinish();
param_and_arg_refs_stack_.VerifyOnFinish();
args_type_info_stack_.VerifyOnFinish();
CARBON_CHECK(struct_type_fields_stack_.empty());
// TODO: Add verification for decl_name_stack_ and
// decl_introducer_state_stack_.
scope_stack_.VerifyOnFinish();
// TODO: Add verification for generic_region_stack_.
}
auto Context::GetOrAddInst(SemIR::LocIdAndInst loc_id_and_inst)
-> SemIR::InstId {
if (loc_id_and_inst.loc_id.is_implicit()) {
auto const_id =
TryEvalInst(*this, SemIR::InstId::Invalid, loc_id_and_inst.inst);
if (const_id.is_valid()) {
CARBON_VLOG("GetOrAddInst: constant: {0}\n", loc_id_and_inst.inst);
return constant_values().GetInstId(const_id);
}
}
// TODO: For an implicit instruction, this reattempts evaluation.
return AddInst(loc_id_and_inst);
}
// Finish producing an instruction. Set its constant value, and register it in
// any applicable instruction lists.
auto Context::FinishInst(SemIR::InstId inst_id, SemIR::Inst inst) -> void {
GenericRegionStack::DependencyKind dep_kind =
GenericRegionStack::DependencyKind::None;
// If the instruction has a symbolic constant type, track that we need to
// substitute into it.
if (constant_values().DependsOnGenericParameter(
types().GetConstantId(inst.type_id()))) {
dep_kind |= GenericRegionStack::DependencyKind::SymbolicType;
}
// If the instruction has a constant value, compute it.
auto const_id = TryEvalInst(*this, inst_id, inst);
constant_values().Set(inst_id, const_id);
if (const_id.is_constant()) {
CARBON_VLOG("Constant: {0} -> {1}\n", inst,
constant_values().GetInstId(const_id));
// If the constant value is symbolic, track that we need to substitute into
// it.
if (constant_values().DependsOnGenericParameter(const_id)) {
dep_kind |= GenericRegionStack::DependencyKind::SymbolicConstant;
}
}
// Keep track of dependent instructions.
if (dep_kind != GenericRegionStack::DependencyKind::None) {
// TODO: Also check for template-dependent instructions.
generic_region_stack().AddDependentInst(
{.inst_id = inst_id, .kind = dep_kind});
}
}
// Returns whether a parse node associated with an imported instruction of kind
// `imported_kind` is usable as the location of a corresponding local
// instruction of kind `local_kind`.
static auto HasCompatibleImportedNodeKind(SemIR::InstKind imported_kind,
SemIR::InstKind local_kind) -> bool {
if (imported_kind == local_kind) {
return true;
}
if (imported_kind == SemIR::ImportDecl::Kind &&
local_kind == SemIR::Namespace::Kind) {
static_assert(
std::is_convertible_v<decltype(SemIR::ImportDecl::Kind)::TypedNodeId,
decltype(SemIR::Namespace::Kind)::TypedNodeId>);
return true;
}
return false;
}
auto Context::CheckCompatibleImportedNodeKind(
SemIR::ImportIRInstId imported_loc_id, SemIR::InstKind kind) -> void {
auto& import_ir_inst = import_ir_insts().Get(imported_loc_id);
const auto* import_ir = import_irs().Get(import_ir_inst.ir_id).sem_ir;
auto imported_kind = import_ir->insts().Get(import_ir_inst.inst_id).kind();
CARBON_CHECK(
HasCompatibleImportedNodeKind(imported_kind, kind),
"Node of kind {0} created with location of imported node of kind {1}",
kind, imported_kind);
}
auto Context::AddPlaceholderInstInNoBlock(SemIR::LocIdAndInst loc_id_and_inst)
-> SemIR::InstId {
auto inst_id = sem_ir().insts().AddInNoBlock(loc_id_and_inst);
CARBON_VLOG("AddPlaceholderInst: {0}\n", loc_id_and_inst.inst);
constant_values().Set(inst_id, SemIR::ConstantId::Invalid);
return inst_id;
}
auto Context::AddPlaceholderInst(SemIR::LocIdAndInst loc_id_and_inst)
-> SemIR::InstId {
auto inst_id = AddPlaceholderInstInNoBlock(loc_id_and_inst);
inst_block_stack_.AddInstId(inst_id);
return inst_id;
}
auto Context::ReplaceLocIdAndInstBeforeConstantUse(
SemIR::InstId inst_id, SemIR::LocIdAndInst loc_id_and_inst) -> void {
sem_ir().insts().SetLocIdAndInst(inst_id, loc_id_and_inst);
CARBON_VLOG("ReplaceInst: {0} -> {1}\n", inst_id, loc_id_and_inst.inst);
FinishInst(inst_id, loc_id_and_inst.inst);
}
auto Context::ReplaceInstBeforeConstantUse(SemIR::InstId inst_id,
SemIR::Inst inst) -> void {
sem_ir().insts().Set(inst_id, inst);
CARBON_VLOG("ReplaceInst: {0} -> {1}\n", inst_id, inst);
FinishInst(inst_id, inst);
}
auto Context::ReplaceInstPreservingConstantValue(SemIR::InstId inst_id,
SemIR::Inst inst) -> void {
auto old_const_id = sem_ir().constant_values().Get(inst_id);
sem_ir().insts().Set(inst_id, inst);
CARBON_VLOG("ReplaceInst: {0} -> {1}\n", inst_id, inst);
auto new_const_id = TryEvalInst(*this, inst_id, inst);
CARBON_CHECK(old_const_id == new_const_id);
}
auto Context::DiagnoseDuplicateName(SemIRLoc dup_def, SemIRLoc prev_def)
-> void {
CARBON_DIAGNOSTIC(NameDeclDuplicate, Error,
"duplicate name being declared in the same scope");
CARBON_DIAGNOSTIC(NameDeclPrevious, Note, "name is previously declared here");
emitter_->Build(dup_def, NameDeclDuplicate)
.Note(prev_def, NameDeclPrevious)
.Emit();
}
auto Context::DiagnoseNameNotFound(SemIRLoc loc, SemIR::NameId name_id)
-> void {
CARBON_DIAGNOSTIC(NameNotFound, Error, "name `{0}` not found", SemIR::NameId);
emitter_->Emit(loc, NameNotFound, name_id);
}
// Given an instruction associated with a scope and a `SpecificId` for that
// scope, returns an instruction that describes the specific scope.
static auto GetInstForSpecificScope(Context& context, SemIR::InstId inst_id,
SemIR::SpecificId specific_id)
-> SemIR::InstId {
if (!specific_id.is_valid()) {
return inst_id;
}
auto inst = context.insts().Get(inst_id);
CARBON_KIND_SWITCH(inst) {
case CARBON_KIND(SemIR::ClassDecl class_decl): {
return context.types().GetInstId(
context.GetClassType(class_decl.class_id, specific_id));
}
case CARBON_KIND(SemIR::InterfaceDecl interface_decl): {
return context.types().GetInstId(
context.GetInterfaceType(interface_decl.interface_id, specific_id));
}
default: {
// Don't know how to form a specific for this generic scope.
// TODO: Handle more cases.
return SemIR::InstId::Invalid;
}
}
}
auto Context::DiagnoseMemberNameNotFound(
SemIRLoc loc, SemIR::NameId name_id,
llvm::ArrayRef<LookupScope> lookup_scopes) -> void {
if (lookup_scopes.size() == 1 &&
lookup_scopes.front().name_scope_id.is_valid()) {
const auto& scope = name_scopes().Get(lookup_scopes.front().name_scope_id);
if (auto specific_inst_id = GetInstForSpecificScope(
*this, scope.inst_id(), lookup_scopes.front().specific_id);
specific_inst_id.is_valid()) {
CARBON_DIAGNOSTIC(MemberNameNotFoundInScope, Error,
"member name `{0}` not found in {1}", SemIR::NameId,
InstIdAsType);
emitter_->Emit(loc, MemberNameNotFoundInScope, name_id, specific_inst_id);
return;
}
}
CARBON_DIAGNOSTIC(MemberNameNotFound, Error, "member name `{0}` not found",
SemIR::NameId);
emitter_->Emit(loc, MemberNameNotFound, name_id);
}
auto Context::NoteAbstractClass(SemIR::ClassId class_id,
DiagnosticBuilder& builder) -> void {
const auto& class_info = classes().Get(class_id);
CARBON_CHECK(
class_info.inheritance_kind == SemIR::Class::InheritanceKind::Abstract,
"Class is not abstract");
CARBON_DIAGNOSTIC(ClassAbstractHere, Note,
"class was declared abstract here");
builder.Note(class_info.definition_id, ClassAbstractHere);
}
auto Context::NoteIncompleteClass(SemIR::ClassId class_id,
DiagnosticBuilder& builder) -> void {
const auto& class_info = classes().Get(class_id);
CARBON_CHECK(!class_info.is_defined(), "Class is not incomplete");
if (class_info.definition_id.is_valid()) {
CARBON_DIAGNOSTIC(ClassIncompleteWithinDefinition, Note,
"class is incomplete within its definition");
builder.Note(class_info.definition_id, ClassIncompleteWithinDefinition);
} else {
CARBON_DIAGNOSTIC(ClassForwardDeclaredHere, Note,
"class was forward declared here");
builder.Note(class_info.latest_decl_id(), ClassForwardDeclaredHere);
}
}
auto Context::NoteUndefinedInterface(SemIR::InterfaceId interface_id,
DiagnosticBuilder& builder) -> void {
const auto& interface_info = interfaces().Get(interface_id);
CARBON_CHECK(!interface_info.is_defined(), "Interface is not incomplete");
if (interface_info.is_being_defined()) {
CARBON_DIAGNOSTIC(InterfaceUndefinedWithinDefinition, Note,
"interface is currently being defined");
builder.Note(interface_info.definition_id,
InterfaceUndefinedWithinDefinition);
} else {
CARBON_DIAGNOSTIC(InterfaceForwardDeclaredHere, Note,
"interface was forward declared here");
builder.Note(interface_info.latest_decl_id(), InterfaceForwardDeclaredHere);
}
}
auto Context::AddNameToLookup(SemIR::NameId name_id, SemIR::InstId target_id)
-> void {
if (auto existing = scope_stack().LookupOrAddName(name_id, target_id);
existing.is_valid()) {
DiagnoseDuplicateName(target_id, existing);
}
}
auto Context::LookupNameInDecl(SemIR::LocId loc_id, SemIR::NameId name_id,
SemIR::NameScopeId scope_id) -> SemIR::InstId {
if (!scope_id.is_valid()) {
// Look for a name in the current scope only. There are two cases where the
// name would be in an outer scope:
//
// - The name is the sole component of the declared name:
//
// class A;
// fn F() {
// class A;
// }
//
// In this case, the inner A is not the same class as the outer A, so
// lookup should not find the outer A.
//
// - The name is a qualifier of some larger declared name:
//
// class A { class B; }
// fn F() {
// class A.B {}
// }
//
// In this case, we're not in the correct scope to define a member of
// class A, so we should reject, and we achieve this by not finding the
// name A from the outer scope.
return scope_stack().LookupInCurrentScope(name_id);
} else {
// We do not look into `extend`ed scopes here. A qualified name in a
// declaration must specify the exact scope in which the name was originally
// introduced:
//
// base class A { fn F(); }
// class B { extend base: A; }
//
// // Error, no `F` in `B`.
// fn B.F() {}
return LookupNameInExactScope(loc_id, name_id, scope_id,
name_scopes().Get(scope_id))
.first;
}
}
auto Context::LookupUnqualifiedName(Parse::NodeId node_id,
SemIR::NameId name_id, bool required)
-> LookupResult {
// TODO: Check for shadowed lookup results.
// Find the results from ancestor lexical scopes. These will be combined with
// results from non-lexical scopes such as namespaces and classes.
auto [lexical_result, non_lexical_scopes] =
scope_stack().LookupInLexicalScopes(name_id);
// Walk the non-lexical scopes and perform lookups into each of them.
for (auto [index, lookup_scope_id, specific_id] :
llvm::reverse(non_lexical_scopes)) {
if (auto non_lexical_result =
LookupQualifiedName(node_id, name_id,
LookupScope{.name_scope_id = lookup_scope_id,
.specific_id = specific_id},
/*required=*/false);
non_lexical_result.inst_id.is_valid()) {
return non_lexical_result;
}
}
if (lexical_result.is_valid()) {
// A lexical scope never needs an associated specific. If there's a
// lexically enclosing generic, then it also encloses the point of use of
// the name.
return {.specific_id = SemIR::SpecificId::Invalid,
.inst_id = lexical_result};
}
// We didn't find anything at all.
if (required) {
DiagnoseNameNotFound(node_id, name_id);
}
return {.specific_id = SemIR::SpecificId::Invalid,
.inst_id = SemIR::ErrorInst::SingletonInstId};
}
auto Context::LookupNameInExactScope(SemIRLoc loc, SemIR::NameId name_id,
SemIR::NameScopeId scope_id,
const SemIR::NameScope& scope)
-> std::pair<SemIR::InstId, SemIR::AccessKind> {
if (auto entry_id = scope.Lookup(name_id)) {
auto entry = scope.GetEntry(*entry_id);
LoadImportRef(*this, entry.inst_id);
return {entry.inst_id, entry.access_kind};
}
if (!scope.import_ir_scopes().empty()) {
// TODO: Enforce other access modifiers for imports.
return {ImportNameFromOtherPackage(*this, loc, scope_id,
scope.import_ir_scopes(), name_id),
SemIR::AccessKind::Public};
}
return {SemIR::InstId::Invalid, SemIR::AccessKind::Public};
}
// Prints diagnostics on invalid qualified name access.
static auto DiagnoseInvalidQualifiedNameAccess(Context& context, SemIRLoc loc,
SemIR::InstId scope_result_id,
SemIR::NameId name_id,
SemIR::AccessKind access_kind,
bool is_parent_access,
AccessInfo access_info) -> void {
auto class_type = context.insts().TryGetAs<SemIR::ClassType>(
context.constant_values().GetInstId(access_info.constant_id));
if (!class_type) {
return;
}
// TODO: Support scoped entities other than just classes.
const auto& class_info = context.classes().Get(class_type->class_id);
auto parent_type_id = class_info.self_type_id;
if (access_kind == SemIR::AccessKind::Private && is_parent_access) {
if (auto base_type_id =
class_info.GetBaseType(context.sem_ir(), class_type->specific_id);
base_type_id.is_valid()) {
parent_type_id = base_type_id;
} else if (auto adapted_type_id = class_info.GetAdaptedType(
context.sem_ir(), class_type->specific_id);
adapted_type_id.is_valid()) {
parent_type_id = adapted_type_id;
} else {
CARBON_FATAL("Expected parent for parent access");
}
}
CARBON_DIAGNOSTIC(
ClassInvalidMemberAccess, Error,
"cannot access {0:private|protected} member `{1}` of type {2}",
BoolAsSelect, SemIR::NameId, SemIR::TypeId);
CARBON_DIAGNOSTIC(ClassMemberDeclaration, Note, "declared here");
context.emitter()
.Build(loc, ClassInvalidMemberAccess,
access_kind == SemIR::AccessKind::Private, name_id, parent_type_id)
.Note(scope_result_id, ClassMemberDeclaration)
.Emit();
}
// Returns whether the access is prohibited by the access modifiers.
static auto IsAccessProhibited(std::optional<AccessInfo> access_info,
SemIR::AccessKind access_kind,
bool is_parent_access) -> bool {
if (!access_info) {
return false;
}
switch (access_kind) {
case SemIR::AccessKind::Public:
return false;
case SemIR::AccessKind::Protected:
return access_info->highest_allowed_access == SemIR::AccessKind::Public;
case SemIR::AccessKind::Private:
return access_info->highest_allowed_access !=
SemIR::AccessKind::Private ||
is_parent_access;
}
}
// Information regarding a prohibited access.
struct ProhibitedAccessInfo {
// The resulting inst of the lookup.
SemIR::InstId scope_result_id;
// The access kind of the lookup.
SemIR::AccessKind access_kind;
// If the lookup is from an extended scope. For example, if this is a base
// class member access from a class that extends it.
bool is_parent_access;
};
auto Context::AppendLookupScopesForConstant(
SemIR::LocId loc_id, SemIR::ConstantId base_const_id,
llvm::SmallVector<LookupScope>* scopes) -> bool {
auto base_id = constant_values().GetInstId(base_const_id);
auto base = insts().Get(base_id);
if (auto base_as_namespace = base.TryAs<SemIR::Namespace>()) {
scopes->push_back(
LookupScope{.name_scope_id = base_as_namespace->name_scope_id,
.specific_id = SemIR::SpecificId::Invalid});
return true;
}
if (auto base_as_class = base.TryAs<SemIR::ClassType>()) {
RequireDefinedType(GetTypeIdForTypeConstant(base_const_id), loc_id, [&] {
CARBON_DIAGNOSTIC(QualifiedExprInIncompleteClassScope, Error,
"member access into incomplete class {0}",
InstIdAsType);
return emitter().Build(loc_id, QualifiedExprInIncompleteClassScope,
base_id);
});
auto& class_info = classes().Get(base_as_class->class_id);
scopes->push_back(LookupScope{.name_scope_id = class_info.scope_id,
.specific_id = base_as_class->specific_id});
return true;
}
if (auto base_as_facet_type = base.TryAs<SemIR::FacetType>()) {
RequireDefinedType(GetTypeIdForTypeConstant(base_const_id), loc_id, [&] {
CARBON_DIAGNOSTIC(QualifiedExprInUndefinedInterfaceScope, Error,
"member access into undefined interface {0}",
InstIdAsType);
return emitter().Build(loc_id, QualifiedExprInUndefinedInterfaceScope,
base_id);
});
const auto& facet_type_info =
facet_types().Get(base_as_facet_type->facet_type_id);
for (auto interface : facet_type_info.impls_constraints) {
auto& interface_info = interfaces().Get(interface.interface_id);
scopes->push_back(LookupScope{.name_scope_id = interface_info.scope_id,
.specific_id = interface.specific_id});
}
return true;
}
if (base_const_id == SemIR::ErrorInst::SingletonConstantId) {
// Lookup into this scope should fail without producing an error.
scopes->push_back(LookupScope{.name_scope_id = SemIR::NameScopeId::Invalid,
.specific_id = SemIR::SpecificId::Invalid});
return true;
}
// TODO: Per the design, if `base_id` is any kind of type, then lookup should
// treat it as a name scope, even if it doesn't have members. For example,
// `(i32*).X` should fail because there's no name `X` in `i32*`, not because
// there's no name `X` in `type`.
return false;
}
auto Context::LookupQualifiedName(SemIR::LocId loc_id, SemIR::NameId name_id,
llvm::ArrayRef<LookupScope> lookup_scopes,
bool required,
std::optional<AccessInfo> access_info)
-> LookupResult {
llvm::SmallVector<LookupScope> scopes(lookup_scopes);
// TODO: Support reporting of multiple prohibited access.
llvm::SmallVector<ProhibitedAccessInfo> prohibited_accesses;
LookupResult result = {.specific_id = SemIR::SpecificId::Invalid,
.inst_id = SemIR::InstId::Invalid};
bool has_error = false;
bool is_parent_access = false;
// Walk this scope and, if nothing is found here, the scopes it extends.
while (!scopes.empty()) {
auto [scope_id, specific_id] = scopes.pop_back_val();
if (!scope_id.is_valid()) {
has_error = true;
continue;
}
const auto& name_scope = name_scopes().Get(scope_id);
has_error |= name_scope.has_error();
auto [scope_result_id, access_kind] =
LookupNameInExactScope(loc_id, name_id, scope_id, name_scope);
auto is_access_prohibited =
IsAccessProhibited(access_info, access_kind, is_parent_access);
// Keep track of prohibited accesses, this will be useful for reporting
// multiple prohibited accesses if we can't find a suitable lookup.
if (is_access_prohibited) {
prohibited_accesses.push_back({
.scope_result_id = scope_result_id,
.access_kind = access_kind,
.is_parent_access = is_parent_access,
});
}
if (!scope_result_id.is_valid() || is_access_prohibited) {
// If nothing is found in this scope or if we encountered an invalid
// access, look in its extended scopes.
const auto& extended = name_scope.extended_scopes();
scopes.reserve(scopes.size() + extended.size());
for (auto extended_id : llvm::reverse(extended)) {
// Substitute into the constant describing the extended scope to
// determine its corresponding specific.
CARBON_CHECK(extended_id.is_valid());
LoadImportRef(*this, extended_id);
SemIR::ConstantId const_id =
GetConstantValueInSpecific(sem_ir(), specific_id, extended_id);
DiagnosticAnnotationScope annotate_diagnostics(
&emitter(), [&](auto& builder) {
CARBON_DIAGNOSTIC(FromExtendHere, Note,
"declared as an extended scope here");
builder.Note(extended_id, FromExtendHere);
});
if (!AppendLookupScopesForConstant(loc_id, const_id, &scopes)) {
// TODO: Handle case where we have a symbolic type and instead should
// look in its type.
}
}
is_parent_access |= !extended.empty();
continue;
}
// If this is our second lookup result, diagnose an ambiguity.
if (result.inst_id.is_valid()) {
CARBON_DIAGNOSTIC(
NameAmbiguousDueToExtend, Error,
"ambiguous use of name `{0}` found in multiple extended scopes",
SemIR::NameId);
emitter_->Emit(loc_id, NameAmbiguousDueToExtend, name_id);
// TODO: Add notes pointing to the scopes.
return {.specific_id = SemIR::SpecificId::Invalid,
.inst_id = SemIR::ErrorInst::SingletonInstId};
}
result.inst_id = scope_result_id;
result.specific_id = specific_id;
}
if (required && !result.inst_id.is_valid()) {
if (!has_error) {
if (prohibited_accesses.empty()) {
DiagnoseMemberNameNotFound(loc_id, name_id, lookup_scopes);
} else {
// TODO: We should report multiple prohibited accesses in case we don't
// find a valid lookup. Reporting the last one should suffice for now.
auto [scope_result_id, access_kind, is_parent_access] =
prohibited_accesses.back();
// Note, `access_info` is guaranteed to have a value here, since
// `prohibited_accesses` is non-empty.
DiagnoseInvalidQualifiedNameAccess(*this, loc_id, scope_result_id,
name_id, access_kind,
is_parent_access, *access_info);
}
}
return {.specific_id = SemIR::SpecificId::Invalid,
.inst_id = SemIR::ErrorInst::SingletonInstId};
}
return result;
}
// Returns the scope of the Core package, or Invalid if it's not found.
//
// TODO: Consider tracking the Core package in SemIR so we don't need to use
// name lookup to find it.
static auto GetCorePackage(Context& context, SemIRLoc loc, llvm::StringRef name)
-> SemIR::NameScopeId {
auto core_ident_id = context.identifiers().Add("Core");
auto packaging = context.parse_tree().packaging_decl();
if (packaging && packaging->names.package_id == core_ident_id) {
return SemIR::NameScopeId::Package;
}
auto core_name_id = SemIR::NameId::ForIdentifier(core_ident_id);
// Look up `package.Core`.
auto [core_inst_id, _] = context.LookupNameInExactScope(
loc, core_name_id, SemIR::NameScopeId::Package,
context.name_scopes().Get(SemIR::NameScopeId::Package));
if (core_inst_id.is_valid()) {
// We expect it to be a namespace.
if (auto namespace_inst =
context.insts().TryGetAs<SemIR::Namespace>(core_inst_id)) {
// TODO: Decide whether to allow the case where `Core` is not a package.
return namespace_inst->name_scope_id;
}
}
CARBON_DIAGNOSTIC(
CoreNotFound, Error,
"`Core.{0}` implicitly referenced here, but package `Core` not found",
std::string);
context.emitter().Emit(loc, CoreNotFound, name.str());
return SemIR::NameScopeId::Invalid;
}
auto Context::LookupNameInCore(SemIRLoc loc, llvm::StringRef name)
-> SemIR::InstId {
auto core_package_id = GetCorePackage(*this, loc, name);
if (!core_package_id.is_valid()) {
return SemIR::ErrorInst::SingletonInstId;
}
auto name_id = SemIR::NameId::ForIdentifier(identifiers().Add(name));
auto [inst_id, _] = LookupNameInExactScope(
loc, name_id, core_package_id, name_scopes().Get(core_package_id));
if (!inst_id.is_valid()) {
CARBON_DIAGNOSTIC(
CoreNameNotFound, Error,
"name `Core.{0}` implicitly referenced here, but not found",
SemIR::NameId);
emitter_->Emit(loc, CoreNameNotFound, name_id);
return SemIR::ErrorInst::SingletonInstId;
}
// Look through import_refs and aliases.
return constant_values().GetConstantInstId(inst_id);
}
template <typename BranchNode, typename... Args>
static auto AddDominatedBlockAndBranchImpl(Context& context,
Parse::NodeId node_id, Args... args)
-> SemIR::InstBlockId {
if (!context.inst_block_stack().is_current_block_reachable()) {
return SemIR::InstBlockId::Unreachable;
}
auto block_id = context.inst_blocks().AddDefaultValue();
context.AddInst<BranchNode>(node_id, {block_id, args...});
return block_id;
}
auto Context::AddDominatedBlockAndBranch(Parse::NodeId node_id)
-> SemIR::InstBlockId {
return AddDominatedBlockAndBranchImpl<SemIR::Branch>(*this, node_id);
}
auto Context::AddDominatedBlockAndBranchWithArg(Parse::NodeId node_id,
SemIR::InstId arg_id)
-> SemIR::InstBlockId {
return AddDominatedBlockAndBranchImpl<SemIR::BranchWithArg>(*this, node_id,
arg_id);
}
auto Context::AddDominatedBlockAndBranchIf(Parse::NodeId node_id,
SemIR::InstId cond_id)
-> SemIR::InstBlockId {
return AddDominatedBlockAndBranchImpl<SemIR::BranchIf>(*this, node_id,
cond_id);
}
auto Context::AddConvergenceBlockAndPush(Parse::NodeId node_id, int num_blocks)
-> void {
CARBON_CHECK(num_blocks >= 2, "no convergence");
SemIR::InstBlockId new_block_id = SemIR::InstBlockId::Unreachable;
for ([[maybe_unused]] auto _ : llvm::seq(num_blocks)) {
if (inst_block_stack().is_current_block_reachable()) {
if (new_block_id == SemIR::InstBlockId::Unreachable) {
new_block_id = inst_blocks().AddDefaultValue();
}
AddInst<SemIR::Branch>(node_id, {.target_id = new_block_id});
}
inst_block_stack().Pop();
}
inst_block_stack().Push(new_block_id);
}
auto Context::AddConvergenceBlockWithArgAndPush(
Parse::NodeId node_id, std::initializer_list<SemIR::InstId> block_args)
-> SemIR::InstId {
CARBON_CHECK(block_args.size() >= 2, "no convergence");
SemIR::InstBlockId new_block_id = SemIR::InstBlockId::Unreachable;
for (auto arg_id : block_args) {
if (inst_block_stack().is_current_block_reachable()) {
if (new_block_id == SemIR::InstBlockId::Unreachable) {
new_block_id = inst_blocks().AddDefaultValue();
}
AddInst<SemIR::BranchWithArg>(
node_id, {.target_id = new_block_id, .arg_id = arg_id});
}
inst_block_stack().Pop();
}
inst_block_stack().Push(new_block_id);
// Acquire the result value.
SemIR::TypeId result_type_id = insts().Get(*block_args.begin()).type_id();
return AddInst<SemIR::BlockArg>(
node_id, {.type_id = result_type_id, .block_id = new_block_id});
}
auto Context::SetBlockArgResultBeforeConstantUse(SemIR::InstId select_id,
SemIR::InstId cond_id,
SemIR::InstId if_true,
SemIR::InstId if_false)
-> void {
CARBON_CHECK(insts().Is<SemIR::BlockArg>(select_id));
// Determine the constant result based on the condition value.
SemIR::ConstantId const_id = SemIR::ConstantId::NotConstant;
auto cond_const_id = constant_values().Get(cond_id);
if (!cond_const_id.is_template()) {
// Symbolic or non-constant condition means a non-constant result.
} else if (auto literal = insts().TryGetAs<SemIR::BoolLiteral>(
constant_values().GetInstId(cond_const_id))) {
const_id = constant_values().Get(literal.value().value.ToBool() ? if_true
: if_false);
} else {
CARBON_CHECK(cond_const_id == SemIR::ErrorInst::SingletonConstantId,
"Unexpected constant branch condition.");
const_id = SemIR::ErrorInst::SingletonConstantId;
}
if (const_id.is_constant()) {
CARBON_VLOG("Constant: {0} -> {1}\n", insts().Get(select_id),
constant_values().GetInstId(const_id));
constant_values().Set(select_id, const_id);
}
}
auto Context::AddCurrentCodeBlockToFunction(Parse::NodeId node_id) -> void {
CARBON_CHECK(!inst_block_stack().empty(), "no current code block");
if (return_scope_stack().empty()) {
CARBON_CHECK(node_id.is_valid(),
"No current function, but node_id not provided");
TODO(node_id,
"Control flow expressions are currently only supported inside "
"functions.");
return;
}
if (!inst_block_stack().is_current_block_reachable()) {
// Don't include unreachable blocks in the function.
return;
}
auto function_id =
insts()
.GetAs<SemIR::FunctionDecl>(return_scope_stack().back().decl_id)
.function_id;
functions()
.Get(function_id)
.body_block_ids.push_back(inst_block_stack().PeekOrAdd());
}
auto Context::is_current_position_reachable() -> bool {
if (!inst_block_stack().is_current_block_reachable()) {
return false;
}
// Our current position is at the end of a reachable block. That position is
// reachable unless the previous instruction is a terminator instruction.
auto block_contents = inst_block_stack().PeekCurrentBlockContents();
if (block_contents.empty()) {
return true;
}
const auto& last_inst = insts().Get(block_contents.back());
return last_inst.kind().terminator_kind() !=
SemIR::TerminatorKind::Terminator;
}
auto Context::Finalize() -> void {
// Pop information for the file-level scope.
sem_ir().set_top_inst_block_id(inst_block_stack().Pop());
scope_stack().Pop();
// Finalizes the list of exports on the IR.
inst_blocks().Set(SemIR::InstBlockId::Exports, exports_);
// Finalizes the ImportRef inst block.
inst_blocks().Set(SemIR::InstBlockId::ImportRefs, import_ref_ids_);
// Finalizes __global_init.
global_init_.Finalize();
}
namespace {
// Worklist-based type completion mechanism.
//
// When attempting to complete a type, we may find other types that also need to
// be completed: types nested within that type, and the value representation of
// the type. In order to complete a type without recursing arbitrarily deeply,
// we use a worklist of tasks:
//
// - An `AddNestedIncompleteTypes` step adds a task for all incomplete types
// nested within a type to the work list.
// - A `BuildValueRepr` step computes the value representation for a
// type, once all of its nested types are complete, and marks the type as
// complete.
class TypeCompleter {
public:
TypeCompleter(Context& context, Context::BuildDiagnosticFn diagnoser)
: context_(context), diagnoser_(diagnoser) {}
// Attempts to complete the given type. Returns true if it is now complete,
// false if it could not be completed.
auto Complete(SemIR::TypeId type_id) -> bool {
Push(type_id);
while (!work_list_.empty()) {
if (!ProcessStep()) {
return false;
}
}
return true;
}
private:
// Adds `type_id` to the work list, if it's not already complete.
auto Push(SemIR::TypeId type_id) -> void {
if (!context_.types().IsComplete(type_id)) {
work_list_.push_back(
{.type_id = type_id, .phase = Phase::AddNestedIncompleteTypes});
}
}
// Runs the next step.
auto ProcessStep() -> bool {
auto [type_id, phase] = work_list_.back();
// We might have enqueued the same type more than once. Just skip the
// type if it's already complete.
if (context_.types().IsComplete(type_id)) {
work_list_.pop_back();
return true;
}
auto inst_id = context_.types().GetInstId(type_id);
auto inst = context_.insts().Get(inst_id);
auto old_work_list_size = work_list_.size();
switch (phase) {
case Phase::AddNestedIncompleteTypes:
if (!AddNestedIncompleteTypes(inst)) {
return false;
}
CARBON_CHECK(work_list_.size() >= old_work_list_size,
"AddNestedIncompleteTypes should not remove work items");
work_list_[old_work_list_size - 1].phase = Phase::BuildValueRepr;
break;
case Phase::BuildValueRepr: {
auto value_rep = BuildValueRepr(type_id, inst);
context_.types().SetValueRepr(type_id, value_rep);
CARBON_CHECK(old_work_list_size == work_list_.size(),
"BuildValueRepr should not change work items");
work_list_.pop_back();
// Also complete the value representation type, if necessary. This
// should never fail: the value representation shouldn't require any
// additional nested types to be complete.
if (!context_.types().IsComplete(value_rep.type_id)) {
work_list_.push_back(
{.type_id = value_rep.type_id, .phase = Phase::BuildValueRepr});
}
// For a pointer representation, the pointee also needs to be complete.
if (value_rep.kind == SemIR::ValueRepr::Pointer) {
if (value_rep.type_id == SemIR::ErrorInst::SingletonTypeId) {
break;
}
auto pointee_type_id =
context_.sem_ir().GetPointeeType(value_rep.type_id);
if (!context_.types().IsComplete(pointee_type_id)) {
work_list_.push_back(
{.type_id = pointee_type_id, .phase = Phase::BuildValueRepr});
}
}
break;
}
}
return true;
}
// Adds any types nested within `type_inst` that need to be complete for
// `type_inst` to be complete to our work list.
auto AddNestedIncompleteTypes(SemIR::Inst type_inst) -> bool {
CARBON_KIND_SWITCH(type_inst) {
case CARBON_KIND(SemIR::ArrayType inst): {
Push(inst.element_type_id);
break;
}
case CARBON_KIND(SemIR::StructType inst): {
for (auto field : context_.struct_type_fields().Get(inst.fields_id)) {
Push(field.type_id);
}
break;
}
case CARBON_KIND(SemIR::TupleType inst): {
for (auto element_type_id :
context_.type_blocks().Get(inst.elements_id)) {
Push(element_type_id);
}
break;
}
case CARBON_KIND(SemIR::ClassType inst): {
auto& class_info = context_.classes().Get(inst.class_id);
if (!class_info.is_defined()) {
if (diagnoser_) {
auto builder = diagnoser_();
context_.NoteIncompleteClass(inst.class_id, builder);
builder.Emit();
}
return false;
}
if (inst.specific_id.is_valid()) {
ResolveSpecificDefinition(context_, inst.specific_id);
}
if (auto adapted_type_id =
class_info.GetAdaptedType(context_.sem_ir(), inst.specific_id);
adapted_type_id.is_valid()) {
Push(adapted_type_id);
} else {
Push(class_info.GetObjectRepr(context_.sem_ir(), inst.specific_id));
}
break;
}
case CARBON_KIND(SemIR::ConstType inst): {
Push(inst.inner_id);
break;
}
default:
break;
}
return true;
}
// Makes an empty value representation, which is used for types that have no
// state, such as empty structs and tuples.
auto MakeEmptyValueRepr() const -> SemIR::ValueRepr {
return {.kind = SemIR::ValueRepr::None,
.type_id = context_.GetTupleType({})};
}
// Makes a value representation that uses pass-by-copy, copying the given
// type.
auto MakeCopyValueRepr(SemIR::TypeId rep_id,
SemIR::ValueRepr::AggregateKind aggregate_kind =
SemIR::ValueRepr::NotAggregate) const
-> SemIR::ValueRepr {
return {.kind = SemIR::ValueRepr::Copy,
.aggregate_kind = aggregate_kind,
.type_id = rep_id};
}
// Makes a value representation that uses pass-by-address with the given
// pointee type.
auto MakePointerValueRepr(SemIR::TypeId pointee_id,
SemIR::ValueRepr::AggregateKind aggregate_kind =
SemIR::ValueRepr::NotAggregate) const
-> SemIR::ValueRepr {
// TODO: Should we add `const` qualification to `pointee_id`?
return {.kind = SemIR::ValueRepr::Pointer,
.aggregate_kind = aggregate_kind,
.type_id = context_.GetPointerType(pointee_id)};
}
// Gets the value representation of a nested type, which should already be
// complete.
auto GetNestedValueRepr(SemIR::TypeId nested_type_id) const {
CARBON_CHECK(context_.types().IsComplete(nested_type_id),
"Nested type should already be complete");
auto value_rep = context_.types().GetValueRepr(nested_type_id);
CARBON_CHECK(value_rep.kind != SemIR::ValueRepr::Unknown,
"Complete type should have a value representation");
return value_rep;
}
template <typename InstT>
requires(InstT::Kind.template IsAnyOf<
SemIR::AutoType, SemIR::BoolType, SemIR::BoundMethodType,
SemIR::ErrorInst, SemIR::IntLiteralType, SemIR::LegacyFloatType,
SemIR::NamespaceType, SemIR::SpecificFunctionType, SemIR::TypeType,
SemIR::VtableType, SemIR::WitnessType>())
auto BuildValueReprForInst(SemIR::TypeId type_id, InstT /*inst*/) const
-> SemIR::ValueRepr {
return MakeCopyValueRepr(type_id);
}
auto BuildValueReprForInst(SemIR::TypeId type_id,
SemIR::StringType /*inst*/) const
-> SemIR::ValueRepr {
// TODO: Decide on string value semantics. This should probably be a
// custom value representation carrying a pointer and size or
// similar.
return MakePointerValueRepr(type_id);
}
auto BuildStructOrTupleValueRepr(size_t num_elements,
SemIR::TypeId elementwise_rep,
bool same_as_object_rep) const
-> SemIR::ValueRepr {
SemIR::ValueRepr::AggregateKind aggregate_kind =
same_as_object_rep ? SemIR::ValueRepr::ValueAndObjectAggregate
: SemIR::ValueRepr::ValueAggregate;
if (num_elements == 1) {
// The value representation for a struct or tuple with a single element
// is a struct or tuple containing the value representation of the
// element.
// TODO: Consider doing the same whenever `elementwise_rep` is
// sufficiently small.
return MakeCopyValueRepr(elementwise_rep, aggregate_kind);
}
// For a struct or tuple with multiple fields, we use a pointer
// to the elementwise value representation.
return MakePointerValueRepr(elementwise_rep, aggregate_kind);
}
auto BuildValueReprForInst(SemIR::TypeId type_id,
SemIR::StructType struct_type) const
-> SemIR::ValueRepr {
auto fields = context_.struct_type_fields().Get(struct_type.fields_id);
if (fields.empty()) {
return MakeEmptyValueRepr();
}
// Find the value representation for each field, and construct a struct
// of value representations.
llvm::SmallVector<SemIR::StructTypeField> value_rep_fields;
value_rep_fields.reserve(fields.size());
bool same_as_object_rep = true;
for (auto field : fields) {
auto field_value_rep = GetNestedValueRepr(field.type_id);
if (!field_value_rep.IsCopyOfObjectRepr(context_.sem_ir(),
field.type_id)) {
same_as_object_rep = false;
field.type_id = field_value_rep.type_id;
}
value_rep_fields.push_back(field);
}
auto value_rep =
same_as_object_rep
? type_id
: context_.GetStructType(
context_.struct_type_fields().AddCanonical(value_rep_fields));
return BuildStructOrTupleValueRepr(fields.size(), value_rep,
same_as_object_rep);
}
auto BuildValueReprForInst(SemIR::TypeId type_id,
SemIR::TupleType tuple_type) const
-> SemIR::ValueRepr {
// TODO: Share more code with structs.
auto elements = context_.type_blocks().Get(tuple_type.elements_id);
if (elements.empty()) {
return MakeEmptyValueRepr();
}
// Find the value representation for each element, and construct a tuple
// of value representations.
llvm::SmallVector<SemIR::TypeId> value_rep_elements;
value_rep_elements.reserve(elements.size());
bool same_as_object_rep = true;
for (auto element_type_id : elements) {
auto element_value_rep = GetNestedValueRepr(element_type_id);
if (!element_value_rep.IsCopyOfObjectRepr(context_.sem_ir(),
element_type_id)) {
same_as_object_rep = false;
}
value_rep_elements.push_back(element_value_rep.type_id);
}
auto value_rep = same_as_object_rep
? type_id
: context_.GetTupleType(value_rep_elements);
return BuildStructOrTupleValueRepr(elements.size(), value_rep,
same_as_object_rep);
}
auto BuildValueReprForInst(SemIR::TypeId type_id,
SemIR::ArrayType /*inst*/) const
-> SemIR::ValueRepr {
// For arrays, it's convenient to always use a pointer representation,
// even when the array has zero or one element, in order to support
// indexing.
return MakePointerValueRepr(type_id, SemIR::ValueRepr::ObjectAggregate);
}
auto BuildValueReprForInst(SemIR::TypeId /*type_id*/,
SemIR::ClassType inst) const -> SemIR::ValueRepr {
auto& class_info = context_.classes().Get(inst.class_id);
// The value representation of an adapter is the value representation of
// its adapted type.
if (auto adapted_type_id =
class_info.GetAdaptedType(context_.sem_ir(), inst.specific_id);
adapted_type_id.is_valid()) {
return GetNestedValueRepr(adapted_type_id);
}
// Otherwise, the value representation for a class is a pointer to the
// object representation.
// TODO: Support customized value representations for classes.
// TODO: Pick a better value representation when possible.
return MakePointerValueRepr(
class_info.GetObjectRepr(context_.sem_ir(), inst.specific_id),
SemIR::ValueRepr::ObjectAggregate);
}
template <typename InstT>
requires(InstT::Kind.template IsAnyOf<
SemIR::AssociatedEntityType, SemIR::FacetAccessType,
SemIR::FacetType, SemIR::FunctionType, SemIR::GenericClassType,
SemIR::GenericInterfaceType, SemIR::UnboundElementType,
SemIR::WhereExpr>())
auto BuildValueReprForInst(SemIR::TypeId /*type_id*/, InstT /*inst*/) const
-> SemIR::ValueRepr {
// These types have no runtime operations, so we use an empty value
// representation.
//
// TODO: There is information we could model here:
// - For an interface, we could use a witness.
// - For an associated entity, we could use an index into the witness.
// - For an unbound element, we could use an index or offset.
return MakeEmptyValueRepr();
}
template <typename InstT>
requires(InstT::Kind.template IsAnyOf<SemIR::BindSymbolicName,
SemIR::InterfaceWitnessAccess>())
auto BuildValueReprForInst(SemIR::TypeId type_id, InstT /*inst*/) const
-> SemIR::ValueRepr {
// For symbolic types, we arbitrarily pick a copy representation.
return MakeCopyValueRepr(type_id);
}
template <typename InstT>
requires(InstT::Kind.template IsAnyOf<SemIR::FloatType, SemIR::IntType,
SemIR::PointerType>())
auto BuildValueReprForInst(SemIR::TypeId type_id, InstT /*inst*/) const
-> SemIR::ValueRepr {
return MakeCopyValueRepr(type_id);
}
auto BuildValueReprForInst(SemIR::TypeId /*type_id*/,
SemIR::ConstType inst) const -> SemIR::ValueRepr {
// The value representation of `const T` is the same as that of `T`.
// Objects are not modifiable through their value representations.
return GetNestedValueRepr(inst.inner_id);
}
template <typename InstT>
requires(InstT::Kind.is_type() == SemIR::InstIsType::Never)
auto BuildValueReprForInst(SemIR::TypeId /*type_id*/, InstT inst) const
-> SemIR::ValueRepr {
CARBON_FATAL("Type refers to non-type inst {0}", inst);
}
// Builds and returns the value representation for the given type. All nested
// types, as found by AddNestedIncompleteTypes, are known to be complete.
auto BuildValueRepr(SemIR::TypeId type_id, SemIR::Inst inst) const
-> SemIR::ValueRepr {
// Use overload resolution to select the implementation, producing compile
// errors when BuildValueReprForInst isn't defined for a given instruction.
CARBON_KIND_SWITCH(inst) {
#define CARBON_SEM_IR_INST_KIND(Name) \
case CARBON_KIND(SemIR::Name typed_inst): { \
return BuildValueReprForInst(type_id, typed_inst); \
}
#include "toolchain/sem_ir/inst_kind.def"
}
}
enum class Phase : int8_t {
// The next step is to add nested types to the list of types to complete.
AddNestedIncompleteTypes,
// The next step is to build the value representation for the type.
BuildValueRepr,
};
struct WorkItem {
SemIR::TypeId type_id;
Phase phase;
};
Context& context_;
llvm::SmallVector<WorkItem> work_list_;
Context::BuildDiagnosticFn diagnoser_;
};
} // namespace
auto Context::TryToCompleteType(SemIR::TypeId type_id) -> bool {
return TypeCompleter(*this, nullptr).Complete(type_id);
}
auto Context::RequireCompleteType(SemIR::TypeId type_id, SemIR::LocId loc_id,
BuildDiagnosticFn diagnoser) -> bool {
CARBON_CHECK(diagnoser);
if (!TypeCompleter(*this, diagnoser).Complete(type_id)) {
return false;
}
// For a symbolic type, create an instruction to require the corresponding
// specific type to be complete.
if (type_id.AsConstantId().is_symbolic()) {
// TODO: Deduplicate these.
AddInstInNoBlock(SemIR::LocIdAndInst(
loc_id,
SemIR::RequireCompleteType{
.type_id = GetSingletonType(SemIR::WitnessType::SingletonInstId),
.complete_type_id = type_id}));
}
return true;
}
auto Context::RequireConcreteType(SemIR::TypeId type_id, SemIR::LocId loc_id,
BuildDiagnosticFn diagnoser,
BuildDiagnosticFn abstract_diagnoser)
-> bool {
CARBON_CHECK(abstract_diagnoser);
if (!RequireCompleteType(type_id, loc_id, diagnoser)) {
return false;
}
if (auto class_type = types().TryGetAs<SemIR::ClassType>(type_id)) {
auto& class_info = classes().Get(class_type->class_id);
if (class_info.inheritance_kind !=
SemIR::Class::InheritanceKind::Abstract) {
return true;
}
auto builder = abstract_diagnoser();
if (!builder) {
return false;
}
NoteAbstractClass(class_type->class_id, builder);
builder.Emit();
return false;
}
return true;
}
auto Context::RequireDefinedType(SemIR::TypeId type_id, SemIR::LocId loc_id,
BuildDiagnosticFn diagnoser) -> bool {
if (!RequireCompleteType(type_id, loc_id, diagnoser)) {
return false;
}
if (auto facet_type = types().TryGetAs<SemIR::FacetType>(type_id)) {
const auto& facet_type_info = facet_types().Get(facet_type->facet_type_id);
for (auto interface : facet_type_info.impls_constraints) {
auto interface_id = interface.interface_id;
if (!interfaces().Get(interface_id).is_defined()) {
auto builder = diagnoser();
NoteUndefinedInterface(interface_id, builder);
builder.Emit();
return false;
}
if (interface.specific_id.is_valid()) {
ResolveSpecificDefinition(*this, interface.specific_id);
}
}
// TODO: Finish facet type resolution.
}
return true;
}
auto Context::GetTypeIdForTypeConstant(SemIR::ConstantId constant_id)
-> SemIR::TypeId {
CARBON_CHECK(constant_id.is_constant(),
"Canonicalizing non-constant type: {0}", constant_id);
auto type_id =
insts().Get(constant_values().GetInstId(constant_id)).type_id();
// TODO: For now, we allow values of facet type to be used as types.
CARBON_CHECK(IsFacetType(type_id) ||
constant_id == SemIR::ErrorInst::SingletonConstantId,
"Forming type ID for non-type constant of type {0}",
types().GetAsInst(type_id));
return SemIR::TypeId::ForTypeConstant(constant_id);
}
auto Context::FacetTypeFromInterface(SemIR::InterfaceId interface_id,
SemIR::SpecificId specific_id)
-> SemIR::FacetType {
SemIR::FacetTypeId facet_type_id = facet_types().Add(
SemIR::FacetTypeInfo{.impls_constraints = {{interface_id, specific_id}},
.other_requirements = false});
return {.type_id = SemIR::TypeType::SingletonTypeId,
.facet_type_id = facet_type_id};
}
// Gets or forms a type_id for a type, given the instruction kind and arguments.
template <typename InstT, typename... EachArgT>
static auto GetTypeImpl(Context& context, EachArgT... each_arg)
-> SemIR::TypeId {
// TODO: Remove inst_id parameter from TryEvalInst.
InstT inst = {SemIR::TypeType::SingletonTypeId, each_arg...};
return context.GetTypeIdForTypeConstant(
TryEvalInst(context, SemIR::InstId::Invalid, inst));
}
// Gets or forms a type_id for a type, given the instruction kind and arguments,
// and completes the type. This should only be used when type completion cannot
// fail.
template <typename InstT, typename... EachArgT>
static auto GetCompleteTypeImpl(Context& context, EachArgT... each_arg)
-> SemIR::TypeId {
auto type_id = GetTypeImpl<InstT>(context, each_arg...);
bool complete = context.TryToCompleteType(type_id);
CARBON_CHECK(complete, "Type completion should not fail");
return type_id;
}
auto Context::GetStructType(SemIR::StructTypeFieldsId fields_id)
-> SemIR::TypeId {
return GetTypeImpl<SemIR::StructType>(*this, fields_id);
}
auto Context::GetTupleType(llvm::ArrayRef<SemIR::TypeId> type_ids)
-> SemIR::TypeId {
return GetTypeImpl<SemIR::TupleType>(*this,
type_blocks().AddCanonical(type_ids));
}
auto Context::GetAssociatedEntityType(SemIR::TypeId interface_type_id,
SemIR::TypeId entity_type_id)
-> SemIR::TypeId {
return GetTypeImpl<SemIR::AssociatedEntityType>(*this, interface_type_id,
entity_type_id);
}
auto Context::GetSingletonType(SemIR::InstId singleton_id) -> SemIR::TypeId {
CARBON_CHECK(SemIR::IsSingletonInstId(singleton_id));
auto type_id = GetTypeIdForTypeInst(singleton_id);
// To keep client code simpler, complete builtin types before returning them.
bool complete = TryToCompleteType(type_id);
CARBON_CHECK(complete, "Failed to complete builtin type");
return type_id;
}
auto Context::GetClassType(SemIR::ClassId class_id,
SemIR::SpecificId specific_id) -> SemIR::TypeId {
return GetCompleteTypeImpl<SemIR::ClassType>(*this, class_id, specific_id);
}
auto Context::GetFunctionType(SemIR::FunctionId fn_id,
SemIR::SpecificId specific_id) -> SemIR::TypeId {
return GetCompleteTypeImpl<SemIR::FunctionType>(*this, fn_id, specific_id);
}
auto Context::GetGenericClassType(SemIR::ClassId class_id,
SemIR::SpecificId enclosing_specific_id)
-> SemIR::TypeId {
return GetCompleteTypeImpl<SemIR::GenericClassType>(*this, class_id,
enclosing_specific_id);
}
auto Context::GetGenericInterfaceType(SemIR::InterfaceId interface_id,
SemIR::SpecificId enclosing_specific_id)
-> SemIR::TypeId {
return GetCompleteTypeImpl<SemIR::GenericInterfaceType>(
*this, interface_id, enclosing_specific_id);
}
auto Context::GetInterfaceType(SemIR::InterfaceId interface_id,
SemIR::SpecificId specific_id) -> SemIR::TypeId {
return GetTypeImpl<SemIR::FacetType>(
*this, FacetTypeFromInterface(interface_id, specific_id).facet_type_id);
}
auto Context::GetPointerType(SemIR::TypeId pointee_type_id) -> SemIR::TypeId {
return GetTypeImpl<SemIR::PointerType>(*this, pointee_type_id);
}
auto Context::GetUnboundElementType(SemIR::TypeId class_type_id,
SemIR::TypeId element_type_id)
-> SemIR::TypeId {
return GetTypeImpl<SemIR::UnboundElementType>(*this, class_type_id,
element_type_id);
}
auto Context::PrintForStackDump(llvm::raw_ostream& output) const -> void {
output << "Check::Context\n";
// In a stack dump, this is probably indented by a tab. We treat that as 8
// spaces then add a couple to indent past the Context label.
constexpr int Indent = 10;
node_stack_.PrintForStackDump(Indent, output);
inst_block_stack_.PrintForStackDump(Indent, output);
pattern_block_stack_.PrintForStackDump(Indent, output);
param_and_arg_refs_stack_.PrintForStackDump(Indent, output);
args_type_info_stack_.PrintForStackDump(Indent, output);
}
auto Context::DumpFormattedFile() const -> void {
SemIR::Formatter formatter(sem_ir_);
formatter.Print(llvm::errs());
}
} // namespace Carbon::Check
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