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_IR_LLVMCONTEXT_H
16 #define LLVM_IR_LLVMCONTEXT_H
18 #include "llvm/Support/Compiler.h"
22 class LLVMContextImpl;
28 template <typename T> class SmallVectorImpl;
30 /// This is an important class for using LLVM in a threaded context. It
31 /// (opaquely) owns and manages the core "global" data of LLVM's core
32 /// infrastructure, including the type and constant uniquing tables.
33 /// LLVMContext itself provides no locking guarantees, so you should be careful
34 /// to have one context per thread.
37 LLVMContextImpl *const pImpl;
41 // Pinned metadata names, which always have the same value. This is a
42 // compile-time performance optimization, not a correctness optimization.
45 MD_tbaa = 1, // "tbaa"
46 MD_prof = 2, // "prof"
47 MD_fpmath = 3, // "fpmath"
48 MD_range = 4, // "range"
49 MD_tbaa_struct = 5 // "tbaa.struct"
52 /// getMDKindID - Return a unique non-zero ID for the specified metadata kind.
53 /// This ID is uniqued across modules in the current LLVMContext.
54 unsigned getMDKindID(StringRef Name) const;
56 /// getMDKindNames - Populate client supplied SmallVector with the name for
57 /// custom metadata IDs registered in this LLVMContext.
58 void getMDKindNames(SmallVectorImpl<StringRef> &Result) const;
61 typedef void (*DiagHandlerTy)(const SMDiagnostic&, void *Context,
64 /// setDiagnosticHandler - This method sets a handler that is invoked
65 /// when problems are detected by the backend. The first argument is a
66 /// function pointer and the second is a context pointer that gets passed
67 /// into the DiagHandler.
69 /// LLVMContext doesn't take ownership or interpret either of these
71 void setDiagnosticHandler(DiagHandlerTy DiagHandler, void *DiagContext = 0);
73 /// getDiagnosticHandler - Return the diagnostic handler set by
74 /// setDiagnosticHandler.
75 DiagHandlerTy getDiagnosticHandler() const;
77 /// getDiagnosticContext - Return the diagnostic context set by
78 /// setDiagnosticHandler.
79 void *getDiagnosticContext() const;
81 /// FIXME: Temporary copies of the old names; to be removed as soon as
82 /// clang switches to the new ones.
83 typedef DiagHandlerTy InlineAsmDiagHandlerTy;
84 void setInlineAsmDiagnosticHandler(InlineAsmDiagHandlerTy DiagHandler,
85 void *DiagContext = 0) {
86 setDiagnosticHandler(DiagHandler, DiagContext);
88 InlineAsmDiagHandlerTy getInlineAsmDiagnosticHandler() const {
89 return getDiagnosticHandler();
91 void *getInlineAsmDiagnosticContext() const {
92 return getDiagnosticContext();
95 /// emitError - Emit an error message to the currently installed error handler
96 /// with optional location information. This function returns, so code should
97 /// be prepared to drop the erroneous construct on the floor and "not crash".
98 /// The generated code need not be correct. The error message will be
99 /// implicitly prefixed with "error: " and should not end with a ".".
100 void emitError(unsigned LocCookie, const Twine &ErrorStr);
101 void emitError(const Instruction *I, const Twine &ErrorStr);
102 void emitError(const Twine &ErrorStr);
105 LLVMContext(LLVMContext&) LLVM_DELETED_FUNCTION;
106 void operator=(LLVMContext&) LLVM_DELETED_FUNCTION;
108 /// addModule - Register a module as being instantiated in this context. If
109 /// the context is deleted, the module will be deleted as well.
110 void addModule(Module*);
112 /// removeModule - Unregister a module from this context.
113 void removeModule(Module*);
115 // Module needs access to the add/removeModule methods.
119 /// getGlobalContext - Returns a global context. This is for LLVM clients that
120 /// only care about operating on a single thread.
121 extern LLVMContext &getGlobalContext();