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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/Types.h"
+#include "llvm/IR/DiagnosticHandler.h"
+#include "llvm/Support/CBindingWrapping.h"
+#include "llvm/Support/Options.h"
+#include <cstdint>
+#include <memory>
+#include <string>
+
+namespace llvm {
+
+class DiagnosticInfo;
+enum DiagnosticSeverity : char;
+class Function;
+class Instruction;
+class LLVMContextImpl;
+class Module;
+class OptPassGate;
+template <typename T> class SmallVectorImpl;
+class SMDiagnostic;
+class StringRef;
+class Twine;
+
+namespace yaml {
+
+class Output;
+
+} // end namespace yaml
+
+namespace SyncScope {
+
+typedef uint8_t ID;
+
+/// Known synchronization scope IDs, which always have the same value. All
+/// synchronization scope IDs that LLVM has special knowledge of are listed
+/// here. Additionally, this scheme allows LLVM to efficiently check for
+/// specific synchronization scope ID without comparing strings.
+enum {
+ /// Synchronized with respect to signal handlers executing in the same thread.
+ SingleThread = 0,
+
+ /// Synchronized with respect to all concurrently executing threads.
+ System = 1
+};
+
+} // end namespace SyncScope
+
+/// 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(LLVMContext &) = delete;
+ LLVMContext &operator=(const LLVMContext &) = delete;
+ ~LLVMContext();
+
+ // Pinned metadata names, which always have the same value. This is a
+ // compile-time performance optimization, not a correctness optimization.
+ enum : unsigned {
+ 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"
+ MD_alias_scope = 7, // "alias.scope"
+ MD_noalias = 8, // "noalias",
+ MD_nontemporal = 9, // "nontemporal"
+ MD_mem_parallel_loop_access = 10, // "llvm.mem.parallel_loop_access"
+ MD_nonnull = 11, // "nonnull"
+ MD_dereferenceable = 12, // "dereferenceable"
+ MD_dereferenceable_or_null = 13, // "dereferenceable_or_null"
+ MD_make_implicit = 14, // "make.implicit"
+ MD_unpredictable = 15, // "unpredictable"
+ MD_invariant_group = 16, // "invariant.group"
+ MD_align = 17, // "align"
+ MD_loop = 18, // "llvm.loop"
+ MD_type = 19, // "type"
+ MD_section_prefix = 20, // "section_prefix"
+ MD_absolute_symbol = 21, // "absolute_symbol"
+ MD_associated = 22, // "associated"
+ MD_callees = 23, // "callees"
+ MD_irr_loop = 24, // "irr_loop"
+ };
+
+ /// Known operand bundle tag IDs, which always have the same value. All
+ /// operand bundle tags that LLVM has special knowledge of are listed here.
+ /// Additionally, this scheme allows LLVM to efficiently check for specific
+ /// operand bundle tags without comparing strings.
+ enum : unsigned {
+ OB_deopt = 0, // "deopt"
+ OB_funclet = 1, // "funclet"
+ OB_gc_transition = 2, // "gc-transition"
+ };
+
+ /// 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;
+
+ /// getOperandBundleTags - Populate client supplied SmallVector with the
+ /// bundle tags registered in this LLVMContext. The bundle tags are ordered
+ /// by increasing bundle IDs.
+ /// \see LLVMContext::getOperandBundleTagID
+ void getOperandBundleTags(SmallVectorImpl<StringRef> &Result) const;
+
+ /// getOperandBundleTagID - Maps a bundle tag to an integer ID. Every bundle
+ /// tag registered with an LLVMContext has an unique ID.
+ uint32_t getOperandBundleTagID(StringRef Tag) const;
+
+ /// getOrInsertSyncScopeID - Maps synchronization scope name to
+ /// synchronization scope ID. Every synchronization scope registered with
+ /// LLVMContext has unique ID except pre-defined ones.
+ SyncScope::ID getOrInsertSyncScopeID(StringRef SSN);
+
+ /// getSyncScopeNames - Populates client supplied SmallVector with
+ /// synchronization scope names registered with LLVMContext. Synchronization
+ /// scope names are ordered by increasing synchronization scope IDs.
+ void getSyncScopeNames(SmallVectorImpl<StringRef> &SSNs) const;
+
+ /// Define the GC for a function
+ void setGC(const Function &Fn, std::string GCName);
+
+ /// Return the GC for a function
+ const std::string &getGC(const Function &Fn);
+
+ /// Remove the GC for a function
+ void deleteGC(const Function &Fn);
+
+ /// Return true if the Context runtime configuration is set to discard all
+ /// value names. When true, only GlobalValue names will be available in the
+ /// IR.
+ bool shouldDiscardValueNames() const;
+
+ /// Set the Context runtime configuration to discard all value name (but
+ /// GlobalValue). Clients can use this flag to save memory and runtime,
+ /// especially in release mode.
+ void setDiscardValueNames(bool Discard);
+
+ /// Whether there is a string map for uniquing debug info
+ /// identifiers across the context. Off by default.
+ bool isODRUniquingDebugTypes() const;
+ void enableDebugTypeODRUniquing();
+ void disableDebugTypeODRUniquing();
+
+ using InlineAsmDiagHandlerTy = void (*)(const SMDiagnostic&, void *Context,
+ unsigned LocCookie);
+
+ /// Defines the type of a yield callback.
+ /// \see LLVMContext::setYieldCallback.
+ using YieldCallbackTy = void (*)(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;
+
+ /// setDiagnosticHandlerCallBack - This method sets a handler call back
+ /// 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. The third argument should be set to
+ /// true if the handler only expects enabled diagnostics.
+ ///
+ /// LLVMContext doesn't take ownership or interpret either of these
+ /// pointers.
+ void setDiagnosticHandlerCallBack(
+ DiagnosticHandler::DiagnosticHandlerTy DiagHandler,
+ void *DiagContext = nullptr, bool RespectFilters = false);
+
+ /// setDiagnosticHandler - This method sets unique_ptr to object of DiagnosticHandler
+ /// to provide custom diagnostic handling. The first argument is unique_ptr of object
+ /// of type DiagnosticHandler or a derived of that. The third argument should be
+ /// set to true if the handler only expects enabled diagnostics.
+ ///
+ /// Ownership of this pointer is moved to LLVMContextImpl.
+ void setDiagnosticHandler(std::unique_ptr<DiagnosticHandler> &&DH,
+ bool RespectFilters = false);
+
+ /// getDiagnosticHandlerCallBack - Return the diagnostic handler call back set by
+ /// setDiagnosticHandlerCallBack.
+ DiagnosticHandler::DiagnosticHandlerTy getDiagnosticHandlerCallBack() const;
+
+ /// getDiagnosticContext - Return the diagnostic context set by
+ /// setDiagnosticContext.
+ void *getDiagnosticContext() const;
+
+ /// getDiagHandlerPtr - Returns const raw pointer of DiagnosticHandler set by
+ /// setDiagnosticHandler.
+ const DiagnosticHandler *getDiagHandlerPtr() const;
+
+ /// getDiagnosticHandler - transfers owenership of DiagnosticHandler unique_ptr
+ /// to caller.
+ std::unique_ptr<DiagnosticHandler> getDiagnosticHandler();
+
+ /// \brief Return if a code hotness metric should be included in optimization
+ /// diagnostics.
+ bool getDiagnosticsHotnessRequested() const;
+ /// \brief Set if a code hotness metric should be included in optimization
+ /// diagnostics.
+ void setDiagnosticsHotnessRequested(bool Requested);
+
+ /// \brief Return the minimum hotness value a diagnostic would need in order
+ /// to be included in optimization diagnostics. If there is no minimum, this
+ /// returns None.
+ uint64_t getDiagnosticsHotnessThreshold() const;
+
+ /// \brief Set the minimum hotness value a diagnostic needs in order to be
+ /// included in optimization diagnostics.
+ void setDiagnosticsHotnessThreshold(uint64_t Threshold);
+
+ /// \brief Return the YAML file used by the backend to save optimization
+ /// diagnostics. If null, diagnostics are not saved in a file but only
+ /// emitted via the diagnostic handler.
+ yaml::Output *getDiagnosticsOutputFile();
+ /// Set the diagnostics output file used for optimization diagnostics.
+ ///
+ /// By default or if invoked with null, diagnostics are not saved in a file
+ /// but only emitted via the diagnostic handler. Even if an output file is
+ /// set, the handler is invoked for each diagnostic message.
+ void setDiagnosticsOutputFile(std::unique_ptr<yaml::Output> F);
+
+ /// \brief Get the prefix that should be printed in front of a diagnostic of
+ /// the given \p Severity
+ static const char *getDiagnosticMessagePrefix(DiagnosticSeverity Severity);
+
+ /// \brief Report a message to the currently installed diagnostic handler.
+ ///
+ /// This function returns, in particular in the case of error reporting
+ /// (DI.Severity == \a DS_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 \a DS_Error,
+ /// "warning: " for \a DS_Warning, and "note: " for \a DS_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);
+
+ /// \brief Query for a debug option's value.
+ ///
+ /// This function returns typed data populated from command line parsing.
+ template <typename ValT, typename Base, ValT(Base::*Mem)>
+ ValT getOption() const {
+ return OptionRegistry::instance().template get<ValT, Base, Mem>();
+ }
+
+ /// \brief Access the object which manages optimization bisection for failure
+ /// analysis.
+ OptPassGate &getOptPassGate();
+
+private:
+ // Module needs access to the add/removeModule methods.
+ friend class Module;
+
+ /// 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*);
+};
+
+// 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));
+}
+
+} // end namespace llvm
+
+#endif // LLVM_IR_LLVMCONTEXT_H