Files
carbon-lang/toolchain/check/pointer_dereference.cpp
T
Chandler Carruth 8c64f0bfdd Add -Wmissing-prototypes and fix issues it finds. (#4019)
Most of these are places where we failed to include a header file and
simply never got an error about this. The fix is to include the header
file.

Most other cases are functions that should have been marked `static` but
were not. Finding all of these was a main motivation for me enabling the
warning despite how much work it is.

One complicating factor was that we weren't including the `handle.h` for
all the state-based handler functions. While this isn't a tiny amount of
code, it is just declarations and doesn't add any extra dependencies. It
also lets us have the checking for which functions need to be `static`
and which don't. For the `parse` library I had to add the `handle.h`
header as well, I tried to match the design of it in `check`.

I have also had to work around a bug in the warning, but given the value
it seems to be providing, that seems reasonable. I've filed the bug
upstream: https://github.com/llvm/llvm-project/issues/94138

I also had to use some hacks to work around limitations of Bazel rules
that wrap `cc_library` rules and don't expose `copts`. I filed a bug for
`cc_proto_library` specifically:
~https://github.com/bazelbuild/bazel/issues/22610~ 
https://github.com/bazelbuild/bazel/issues/4446
2024-06-04 20:04:45 +00:00

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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/pointer_dereference.h"
#include "llvm/ADT/STLFunctionalExtras.h"
#include "toolchain/check/context.h"
#include "toolchain/check/convert.h"
#include "toolchain/parse/node_ids.h"
#include "toolchain/sem_ir/ids.h"
namespace Carbon::Check {
auto PerformPointerDereference(
Context& context, Parse::AnyPointerDeferenceExprId node_id,
SemIR::InstId base_id,
llvm::function_ref<auto(SemIR::TypeId not_pointer_type_id)->void>
diagnose_not_pointer) -> SemIR::InstId {
// TODO: Once we have a finalized design for a pointer interface, use
//
// HandleUnaryOperator(context, node_id, {"Pointer", "Dereference"});
//
// to convert to a pointer value.
base_id = ConvertToValueExpr(context, base_id);
auto type_id =
context.GetUnqualifiedType(context.insts().Get(base_id).type_id());
auto result_type_id = SemIR::TypeId::Error;
if (auto pointer_type =
context.types().TryGetAs<SemIR::PointerType>(type_id)) {
result_type_id = pointer_type->pointee_id;
} else if (type_id != SemIR::TypeId::Error) {
diagnose_not_pointer(type_id);
}
return context.AddInst<SemIR::Deref>(
node_id, {.type_id = result_type_id, .pointer_id = base_id});
}
} // namespace Carbon::Check