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https://github.com/carbon-language/carbon-lang.git
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Richard Smith
709776ad1c
Instead of treating all C++ code as coming from a single synthetic `CheckIRId`, track the `SemIR::File` associated with each C++ location. This is necessary since each `SemIR::File` has a distinct `CppFile` and therefore distinct `SourceLocation`s and `ClangSourceLocId`s. Assisted-by: Gemini via Antigravity
78 lines
2.5 KiB
C++
78 lines
2.5 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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#ifndef CARBON_TOOLCHAIN_SEM_IR_ABSOLUTE_NODE_REF_H_
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#define CARBON_TOOLCHAIN_SEM_IR_ABSOLUTE_NODE_REF_H_
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#include "toolchain/parse/tree_and_subtrees.h"
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#include "toolchain/sem_ir/file.h"
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#include "toolchain/sem_ir/ids.h"
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namespace Carbon::SemIR {
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// A specific node location in a file. Usually refers to a NodeId in a Carbon
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// source file, but can also refer to a Clang source location within imported
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// C++ code.
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class AbsoluteNodeRef {
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public:
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// A specific node location in a file.
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explicit AbsoluteNodeRef(const File* file, Parse::NodeId node_id)
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: file_(file), is_cpp_(false), node_id_(node_id) {}
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// A Clang source location within imported C++ code.
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explicit AbsoluteNodeRef(const File* file,
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ClangSourceLocId clang_source_loc_id)
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: file_(file), is_cpp_(true), clang_source_loc_id_(clang_source_loc_id) {}
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// The file containing the location.
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auto file() const -> const File* { return file_; }
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// The ID of the IR.
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auto check_ir_id() const -> CheckIRId { return file_->check_ir_id(); }
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// Returns true if this is a C++ location.
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auto is_cpp() const -> bool { return is_cpp_; }
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// The specific node location in a file. Must be called only if
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// `is_cpp()` is false.
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auto node_id() const -> Parse::NodeId {
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CARBON_CHECK(!is_cpp());
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return node_id_;
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}
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// The Clang source location. Must be called only if `is_cpp()` is true.
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auto clang_source_loc_id() const -> ClangSourceLocId {
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CARBON_CHECK(is_cpp());
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return clang_source_loc_id_;
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}
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private:
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// The file containing the location.
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const File* file_;
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// True if this is a C++ location.
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bool is_cpp_;
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union {
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// See `node_id()`.
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Parse::NodeId node_id_;
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// See `clang_source_loc_id()`.
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ClangSourceLocId clang_source_loc_id_;
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};
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};
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// Resolves the `LocId` to a series of `AbsoluteNodeRef`s, which may be in
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// different files. The vector will have one entry if there were no imports, and
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// multiple entries when imports are traversed. The final entry is the actual
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// declaration.
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//
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// Note that the `LocId` here is typically not canonical, and it uses that fact
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// for non-canonical locations built from an `ExportDecl` instruction.
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auto GetAbsoluteNodeRef(const File* sem_ir, LocId loc_id)
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-> llvm::SmallVector<AbsoluteNodeRef>;
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} // namespace Carbon::SemIR
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#endif // CARBON_TOOLCHAIN_SEM_IR_ABSOLUTE_NODE_REF_H_
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