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//===-- llvm/LLVMContext.h - Class for managing "global" state --*- C++ -*-===//
//
// The LLVM Compiler Infrastructure
//
// This file is distributed under the University of Illinois Open Source
// License. See LICENSE.TXT for details.
//
//===----------------------------------------------------------------------===//
//
// This file declares LLVMContext, a container of "global" state in LLVM, such
// as the global type and constant uniquing tables.
//
//===----------------------------------------------------------------------===//
#ifndef LLVM_IR_LLVMCONTEXT_H
#define LLVM_IR_LLVMCONTEXT_H
#include "llvm-c/Core.h"
#include "llvm/Support/CBindingWrapping.h"
#include "llvm/Support/Compiler.h"
namespace llvm {
class LLVMContextImpl;
class StringRef;
class Twine;
class Instruction;
class Module;
class SMDiagnostic;
class DiagnosticInfo;
template <typename T> class SmallVectorImpl;
class Function;
class DebugLoc;
/// This is an important class for using LLVM in a threaded context. It
/// (opaquely) owns and manages the core "global" data of LLVM's core
/// infrastructure, including the type and constant uniquing tables.
/// LLVMContext itself provides no locking guarantees, so you should be careful
/// to have one context per thread.
class LLVMContext {
public:
LLVMContextImpl *const pImpl;
LLVMContext();
~LLVMContext();
// Pinned metadata names, which always have the same value. This is a
// compile-time performance optimization, not a correctness optimization.
enum {
MD_dbg = 0, // "dbg"
MD_tbaa = 1, // "tbaa"
MD_prof = 2, // "prof"
MD_fpmath = 3, // "fpmath"
MD_range = 4, // "range"
MD_tbaa_struct = 5, // "tbaa.struct"
MD_invariant_load = 6 // "invariant.load"
};
/// getMDKindID - Return a unique non-zero ID for the specified metadata kind.
/// This ID is uniqued across modules in the current LLVMContext.
unsigned getMDKindID(StringRef Name) const;
/// getMDKindNames - Populate client supplied SmallVector with the name for
/// custom metadata IDs registered in this LLVMContext.
void getMDKindNames(SmallVectorImpl<StringRef> &Result) const;
typedef void (*InlineAsmDiagHandlerTy)(const SMDiagnostic&, void *Context,
unsigned LocCookie);
/// Defines the type of a diagnostic handler.
/// \see LLVMContext::setDiagnosticHandler.
/// \see LLVMContext::diagnose.
typedef void (*DiagnosticHandlerTy)(const DiagnosticInfo &DI, void *Context);
/// Defines the type of a yield callback.
/// \see LLVMContext::setYieldCallback.
typedef void (*YieldCallbackTy)(LLVMContext *Context, void *OpaqueHandle);
/// setInlineAsmDiagnosticHandler - This method sets a handler that is invoked
/// when problems with inline asm are detected by the backend. The first
/// argument is a function pointer and the second is a context pointer that
/// gets passed into the DiagHandler.
///
/// LLVMContext doesn't take ownership or interpret either of these
/// pointers.
void setInlineAsmDiagnosticHandler(InlineAsmDiagHandlerTy DiagHandler,
void *DiagContext = nullptr);
/// getInlineAsmDiagnosticHandler - Return the diagnostic handler set by
/// setInlineAsmDiagnosticHandler.
InlineAsmDiagHandlerTy getInlineAsmDiagnosticHandler() const;
/// getInlineAsmDiagnosticContext - Return the diagnostic context set by
/// setInlineAsmDiagnosticHandler.
void *getInlineAsmDiagnosticContext() const;
/// setDiagnosticHandler - This method sets a handler that is invoked
/// when the backend needs to report anything to the user. The first
/// argument is a function pointer and the second is a context pointer that
/// gets passed into the DiagHandler.
///
/// LLVMContext doesn't take ownership or interpret either of these
/// pointers.
void setDiagnosticHandler(DiagnosticHandlerTy DiagHandler,
void *DiagContext = nullptr);
/// getDiagnosticHandler - Return the diagnostic handler set by
/// setDiagnosticHandler.
DiagnosticHandlerTy getDiagnosticHandler() const;
/// getDiagnosticContext - Return the diagnostic context set by
/// setDiagnosticContext.
void *getDiagnosticContext() const;
/// diagnose - Report a message to the currently installed diagnostic handler.
/// This function returns, in particular in the case of error reporting
/// (DI.Severity == RS_Error), so the caller should leave the compilation
/// process in a self-consistent state, even though the generated code
/// need not be correct.
/// The diagnostic message will be implicitly prefixed with a severity
/// keyword according to \p DI.getSeverity(), i.e., "error: "
/// for RS_Error, "warning: " for RS_Warning, and "note: " for RS_Note.
void diagnose(const DiagnosticInfo &DI);
/// \brief Registers a yield callback with the given context.
///
/// The yield callback function may be called by LLVM to transfer control back
/// to the client that invoked the LLVM compilation. This can be used to yield
/// control of the thread, or perform periodic work needed by the client.
/// There is no guaranteed frequency at which callbacks must occur; in fact,
/// the client is not guaranteed to ever receive this callback. It is at the
/// sole discretion of LLVM to do so and only if it can guarantee that
/// suspending the thread won't block any forward progress in other LLVM
/// contexts in the same process.
///
/// At a suspend point, the state of the current LLVM context is intentionally
/// undefined. No assumptions about it can or should be made. Only LLVM
/// context API calls that explicitly state that they can be used during a
/// yield callback are allowed to be used. Any other API calls into the
/// context are not supported until the yield callback function returns
/// control to LLVM. Other LLVM contexts are unaffected by this restriction.
void setYieldCallback(YieldCallbackTy Callback, void *OpaqueHandle);
/// \brief Calls the yield callback (if applicable).
///
/// This transfers control of the current thread back to the client, which may
/// suspend the current thread. Only call this method when LLVM doesn't hold
/// any global mutex or cannot block the execution in another LLVM context.
void yield();
/// emitError - Emit an error message to the currently installed error handler
/// with optional location information. This function returns, so code should
/// be prepared to drop the erroneous construct on the floor and "not crash".
/// The generated code need not be correct. The error message will be
/// implicitly prefixed with "error: " and should not end with a ".".
void emitError(unsigned LocCookie, const Twine &ErrorStr);
void emitError(const Instruction *I, const Twine &ErrorStr);
void emitError(const Twine &ErrorStr);
private:
LLVMContext(LLVMContext&) LLVM_DELETED_FUNCTION;
void operator=(LLVMContext&) LLVM_DELETED_FUNCTION;
/// addModule - Register a module as being instantiated in this context. If
/// the context is deleted, the module will be deleted as well.
void addModule(Module*);
/// removeModule - Unregister a module from this context.
void removeModule(Module*);
// Module needs access to the add/removeModule methods.
friend class Module;
};
/// getGlobalContext - Returns a global context. This is for LLVM clients that
/// only care about operating on a single thread.
extern LLVMContext &getGlobalContext();
// Create wrappers for C Binding types (see CBindingWrapping.h).
DEFINE_SIMPLE_CONVERSION_FUNCTIONS(LLVMContext, LLVMContextRef)
/* Specialized opaque context conversions.
*/
inline LLVMContext **unwrap(LLVMContextRef* Tys) {
return reinterpret_cast<LLVMContext**>(Tys);
}
inline LLVMContextRef *wrap(const LLVMContext **Tys) {
return reinterpret_cast<LLVMContextRef*>(const_cast<LLVMContext**>(Tys));
}
}
#endif
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