1 //===-- llvm/LLVMContext.h - Class for managing "global" state --*- C++ -*-===//
3 // The LLVM Compiler Infrastructure
5 // This file is distributed under the University of Illinois Open Source
6 // License. See LICENSE.TXT for details.
8 //===----------------------------------------------------------------------===//
10 // This file declares LLVMContext, a container of "global" state in LLVM, such
11 // as the global type and constant uniquing tables.
13 //===----------------------------------------------------------------------===//
15 #ifndef LLVM_LLVMCONTEXT_H
16 #define LLVM_LLVMCONTEXT_H
20 class LLVMContextImpl;
22 template <typename T> class SmallVectorImpl;
24 /// This is an important class for using LLVM in a threaded context. It
25 /// (opaquely) owns and manages the core "global" data of LLVM's core
26 /// infrastructure, including the type and constant uniquing tables.
27 /// LLVMContext itself provides no locking guarantees, so you should be careful
28 /// to have one context per thread.
31 LLVMContext(LLVMContext&);
32 void operator=(LLVMContext&);
35 LLVMContextImpl *const pImpl;
39 // Pinned metadata names, which always have the same value. This is a
40 // compile-time performance optimization, not a correctness optimization.
42 MD_dbg = 1 // "dbg" -> 1.
45 /// getMDKindID - Return a unique non-zero ID for the specified metadata kind.
46 /// This ID is uniqued across modules in the current LLVMContext.
47 unsigned getMDKindID(StringRef Name) const;
49 /// getMDKindNames - Populate client supplied SmallVector with the name for
50 /// custom metadata IDs registered in this LLVMContext. ID #0 is not used,
51 /// so it is filled in as an empty string.
52 void getMDKindNames(SmallVectorImpl<StringRef> &Result) const;
55 /// getGlobalContext - Returns a global context. This is for LLVM clients that
56 /// only care about operating on a single thread.
57 extern LLVMContext &getGlobalContext();