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aa8a5f174d
* Replaced std::exit() with return llvm::Expected/llvm::Error<T> for expected errors like invalid syntax. * Use llvm::formatv() for formatting lexer error messages. x * Addresed merge errors. * Fixed impl scope. * Made ErrorBuilder::operator<< nodiscard, to catch code forgetting 'return' in 'return FATAL_COMPILATION_ERROR()'. * FatalComplationError() -> ParseAndLexContext::RecordLexerError(). Other usages of ERROR_TOKEN in lexer.lpp were actually supposed to be END_OF_FILE. * Update executable_semantics/syntax/parse_and_lex_context.h Co-authored-by: Jon Meow <jperkins@google.com> * Code review fixes. * Update executable_semantics/syntax/parser.ypp Co-authored-by: Jon Meow <jperkins@google.com> * More code review fixes. * Update executable_semantics/interpreter/type_checker.h Co-authored-by: Jon Meow <jperkins@google.com> * Yet more code review fixes... * Update executable_semantics/syntax/lexer.lpp Co-authored-by: Jon Meow <jperkins@google.com> * code review comments * Update executable_semantics/interpreter/interpreter.cpp Co-authored-by: Geoff Romer <gromer@google.com> * Apply suggestions from code review Co-authored-by: Jon Meow <jperkins@google.com> * Update executable_semantics/syntax/lexer.lpp Co-authored-by: Jon Meow <jperkins@google.com> * code review * code review * Apply suggestions from code review Co-authored-by: Jon Meow <jperkins@google.com> * formatted code * review comments * Switched to the new ErrorOr<V> error implementation * code review comments * fixed comment * restored ostream.h as #976 makes the change unnecesary * review comments Co-authored-by: Jon Meow <jperkins@google.com> Co-authored-by: Geoff Romer <gromer@google.com>
83 lines
2.7 KiB
C++
83 lines
2.7 KiB
C++
// Part of the Carbon Language project, under the Apache License v2.0 with LLVM
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// Exceptions. See /LICENSE for license information.
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// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
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#include "executable_semantics/interpreter/impl_scope.h"
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#include "executable_semantics/common/error.h"
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#include "executable_semantics/interpreter/value.h"
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#include "llvm/Support/Casting.h"
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using llvm::cast;
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namespace Carbon {
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void ImplScope::Add(Nonnull<const Value*> iface, Nonnull<const Value*> type,
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ValueNodeView impl) {
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impls_.push_back({.interface = iface, .type = type, .impl = impl});
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}
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void ImplScope::AddParent(Nonnull<const ImplScope*> parent) {
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parent_scopes_.push_back(parent);
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}
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auto ImplScope::Resolve(Nonnull<const Value*> iface_type,
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Nonnull<const Value*> type,
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SourceLocation source_loc) const
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-> ErrorOr<ValueNodeView> {
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ASSIGN_OR_RETURN(std::optional<ValueNodeView> result,
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TryResolve(iface_type, type, source_loc));
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if (!result.has_value()) {
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return FATAL_COMPILATION_ERROR(source_loc)
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<< "could not find implementation of " << *iface_type << " for "
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<< *type;
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}
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return *result;
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}
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auto ImplScope::TryResolve(Nonnull<const Value*> iface_type,
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Nonnull<const Value*> type,
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SourceLocation source_loc) const
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-> ErrorOr<std::optional<ValueNodeView>> {
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std::optional<ValueNodeView> result =
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ResolveHere(iface_type, type, source_loc);
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if (result.has_value()) {
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return result;
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}
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for (Nonnull<const ImplScope*> parent : parent_scopes_) {
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ASSIGN_OR_RETURN(auto parent_result,
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parent->TryResolve(iface_type, type, source_loc));
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if (parent_result.has_value() && result.has_value() &&
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*parent_result != *result) {
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return FATAL_COMPILATION_ERROR(source_loc)
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<< "ambiguous implementations of " << *iface_type << " for "
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<< *type;
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}
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result = parent_result;
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}
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return result;
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}
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auto ImplScope::ResolveHere(Nonnull<const Value*> iface_type,
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Nonnull<const Value*> impl_type,
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SourceLocation /*source_loc*/) const
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-> std::optional<ValueNodeView> {
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switch (iface_type->kind()) {
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case Value::Kind::InterfaceType: {
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const auto& iface = cast<InterfaceType>(*iface_type);
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for (const Impl& impl : impls_) {
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if (TypeEqual(&iface, impl.interface) &&
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TypeEqual(impl_type, impl.type)) {
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return impl.impl;
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}
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}
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return std::nullopt;
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}
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default:
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FATAL() << "expected an interface, not " << *iface_type;
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break;
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}
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}
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} // namespace Carbon
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