[llvm] [LLVM][IR] Add location tracking to LLVM IR parser (PR #155797)

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@@ -0,0 +1,69 @@
+//===-- AsmParserContext.h --------------------------------------*- C++ -*-===//
+//
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
+//
+//===----------------------------------------------------------------------===//
+
+#ifndef LLVM_ASMPARSER_ASMPARSER_STATE_H
+#define LLVM_ASMPARSER_ASMPARSER_STATE_H
+
+#include "llvm/ADT/DenseMap.h"
+#include "llvm/IR/Value.h"
+#include <optional>
+
+namespace llvm {
+
+/// Registry of file location information for LLVM IR constructs
+///
+/// This class provides access to the file location information
+/// for various LLVM IR constructs. Currently, it supports Function,
+/// BasicBlock and Instruction locations.
+///
+/// When available, it can answer queries about what is at a given
+/// file location, as well as where in a file a given IR construct
+/// is.
+///
+/// This information is optionally emitted by the LLParser while
+/// it reads LLVM textual IR.
+class AsmParserContext {
----------------
Bertik23 wrote:

It is supposed to be used similarly to AsmParserState in MLIR, In tools, that need to know some things from the parser, in this case we want to use it to be able to access locations or instructions, functions, ... in IR files for the purposes of navigating in the file via a LSP server (such as goto definition/references)

https://github.com/llvm/llvm-project/pull/155797