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llvm-project/clang/lib/CodeGen/CGOpenMPRuntime.h

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//===----- CGOpenMPRuntime.h - Interface to OpenMP Runtimes -----*- C++ -*-===//
//
// The LLVM Compiler Infrastructure
//
// This file is distributed under the University of Illinois Open Source
// License. See LICENSE.TXT for details.
//
//===----------------------------------------------------------------------===//
//
// This provides a class for OpenMP runtime code generation.
//
//===----------------------------------------------------------------------===//
#ifndef LLVM_CLANG_LIB_CODEGEN_CGOPENMPRUNTIME_H
#define LLVM_CLANG_LIB_CODEGEN_CGOPENMPRUNTIME_H
#include "clang/AST/Type.h"
#include "clang/Basic/OpenMPKinds.h"
#include "clang/Basic/SourceLocation.h"
#include "llvm/ADT/DenseMap.h"
#include "llvm/ADT/DenseSet.h"
#include "llvm/ADT/StringMap.h"
#include "llvm/IR/ValueHandle.h"
namespace llvm {
class ArrayType;
class Constant;
class Function;
class FunctionType;
class GlobalVariable;
class StructType;
class Type;
class Value;
} // namespace llvm
namespace clang {
class Expr;
class OMPExecutableDirective;
class VarDecl;
namespace CodeGen {
class CodeGenFunction;
class CodeGenModule;
typedef llvm::function_ref<void(CodeGenFunction &)> RegionCodeGenTy;
class CGOpenMPRuntime {
private:
enum OpenMPRTLFunction {
/// \brief Call to void __kmpc_fork_call(ident_t *loc, kmp_int32 argc,
/// kmpc_micro microtask, ...);
OMPRTL__kmpc_fork_call,
/// \brief Call to void *__kmpc_threadprivate_cached(ident_t *loc,
/// kmp_int32 global_tid, void *data, size_t size, void ***cache);
OMPRTL__kmpc_threadprivate_cached,
/// \brief Call to void __kmpc_threadprivate_register( ident_t *,
/// void *data, kmpc_ctor ctor, kmpc_cctor cctor, kmpc_dtor dtor);
OMPRTL__kmpc_threadprivate_register,
// Call to __kmpc_int32 kmpc_global_thread_num(ident_t *loc);
OMPRTL__kmpc_global_thread_num,
// Call to void __kmpc_critical(ident_t *loc, kmp_int32 global_tid,
// kmp_critical_name *crit);
OMPRTL__kmpc_critical,
// Call to void __kmpc_end_critical(ident_t *loc, kmp_int32 global_tid,
// kmp_critical_name *crit);
OMPRTL__kmpc_end_critical,
// Call to kmp_int32 __kmpc_cancel_barrier(ident_t *loc, kmp_int32
// global_tid);
OMPRTL__kmpc_cancel_barrier,
// Call to void __kmpc_for_static_fini(ident_t *loc, kmp_int32 global_tid);
OMPRTL__kmpc_for_static_fini,
// Call to void __kmpc_serialized_parallel(ident_t *loc, kmp_int32
// global_tid);
OMPRTL__kmpc_serialized_parallel,
// Call to void __kmpc_end_serialized_parallel(ident_t *loc, kmp_int32
// global_tid);
OMPRTL__kmpc_end_serialized_parallel,
// Call to void __kmpc_push_num_threads(ident_t *loc, kmp_int32 global_tid,
// kmp_int32 num_threads);
OMPRTL__kmpc_push_num_threads,
// Call to void __kmpc_flush(ident_t *loc);
OMPRTL__kmpc_flush,
// Call to kmp_int32 __kmpc_master(ident_t *, kmp_int32 global_tid);
OMPRTL__kmpc_master,
// Call to void __kmpc_end_master(ident_t *, kmp_int32 global_tid);
OMPRTL__kmpc_end_master,
// Call to kmp_int32 __kmpc_omp_taskyield(ident_t *, kmp_int32 global_tid,
// int end_part);
OMPRTL__kmpc_omp_taskyield,
// Call to kmp_int32 __kmpc_single(ident_t *, kmp_int32 global_tid);
OMPRTL__kmpc_single,
// Call to void __kmpc_end_single(ident_t *, kmp_int32 global_tid);
OMPRTL__kmpc_end_single,
// Call to kmp_task_t * __kmpc_omp_task_alloc(ident_t *, kmp_int32 gtid,
// kmp_int32 flags, size_t sizeof_kmp_task_t, size_t sizeof_shareds,
// kmp_routine_entry_t *task_entry);
OMPRTL__kmpc_omp_task_alloc,
// Call to kmp_int32 __kmpc_omp_task(ident_t *, kmp_int32 gtid, kmp_task_t *
// new_task);
OMPRTL__kmpc_omp_task,
// Call to void __kmpc_copyprivate(ident_t *loc, kmp_int32 global_tid,
// kmp_int32 cpy_size, void *cpy_data, void(*cpy_func)(void *, void *),
// kmp_int32 didit);
OMPRTL__kmpc_copyprivate,
// Call to kmp_int32 __kmpc_reduce(ident_t *loc, kmp_int32 global_tid,
// kmp_int32 num_vars, size_t reduce_size, void *reduce_data, void
// (*reduce_func)(void *lhs_data, void *rhs_data), kmp_critical_name *lck);
OMPRTL__kmpc_reduce,
// Call to kmp_int32 __kmpc_reduce_nowait(ident_t *loc, kmp_int32
// global_tid, kmp_int32 num_vars, size_t reduce_size, void *reduce_data,
// void (*reduce_func)(void *lhs_data, void *rhs_data), kmp_critical_name
// *lck);
OMPRTL__kmpc_reduce_nowait,
// Call to void __kmpc_end_reduce(ident_t *loc, kmp_int32 global_tid,
// kmp_critical_name *lck);
OMPRTL__kmpc_end_reduce,
// Call to void __kmpc_end_reduce_nowait(ident_t *loc, kmp_int32 global_tid,
// kmp_critical_name *lck);
OMPRTL__kmpc_end_reduce_nowait,
// Call to void __kmpc_omp_task_begin_if0(ident_t *, kmp_int32 gtid,
// kmp_task_t * new_task);
OMPRTL__kmpc_omp_task_begin_if0,
// Call to void __kmpc_omp_task_complete_if0(ident_t *, kmp_int32 gtid,
// kmp_task_t * new_task);
OMPRTL__kmpc_omp_task_complete_if0,
// Call to void __kmpc_ordered(ident_t *loc, kmp_int32 global_tid);
OMPRTL__kmpc_ordered,
// Call to void __kmpc_end_ordered(ident_t *loc, kmp_int32 global_tid);
OMPRTL__kmpc_end_ordered,
// Call to kmp_int32 __kmpc_omp_taskwait(ident_t *loc, kmp_int32
// global_tid);
OMPRTL__kmpc_omp_taskwait,
};
/// \brief Values for bit flags used in the ident_t to describe the fields.
/// All enumeric elements are named and described in accordance with the code
/// from http://llvm.org/svn/llvm-project/openmp/trunk/runtime/src/kmp.h
enum OpenMPLocationFlags {
/// \brief Use trampoline for internal microtask.
OMP_IDENT_IMD = 0x01,
/// \brief Use c-style ident structure.
OMP_IDENT_KMPC = 0x02,
/// \brief Atomic reduction option for kmpc_reduce.
OMP_ATOMIC_REDUCE = 0x10,
/// \brief Explicit 'barrier' directive.
OMP_IDENT_BARRIER_EXPL = 0x20,
/// \brief Implicit barrier in code.
OMP_IDENT_BARRIER_IMPL = 0x40,
/// \brief Implicit barrier in 'for' directive.
OMP_IDENT_BARRIER_IMPL_FOR = 0x40,
/// \brief Implicit barrier in 'sections' directive.
OMP_IDENT_BARRIER_IMPL_SECTIONS = 0xC0,
/// \brief Implicit barrier in 'single' directive.
OMP_IDENT_BARRIER_IMPL_SINGLE = 0x140
};
CodeGenModule &CGM;
/// \brief Default const ident_t object used for initialization of all other
/// ident_t objects.
llvm::Constant *DefaultOpenMPPSource;
/// \brief Map of flags and corresponding default locations.
typedef llvm::DenseMap<unsigned, llvm::Value *> OpenMPDefaultLocMapTy;
OpenMPDefaultLocMapTy OpenMPDefaultLocMap;
llvm::Value *getOrCreateDefaultLocation(OpenMPLocationFlags Flags);
/// \brief Describes ident structure that describes a source location.
/// All descriptions are taken from
/// http://llvm.org/svn/llvm-project/openmp/trunk/runtime/src/kmp.h
/// Original structure:
/// typedef struct ident {
/// kmp_int32 reserved_1; /**< might be used in Fortran;
/// see above */
/// kmp_int32 flags; /**< also f.flags; KMP_IDENT_xxx flags;
/// KMP_IDENT_KMPC identifies this union
/// member */
/// kmp_int32 reserved_2; /**< not really used in Fortran any more;
/// see above */
///#if USE_ITT_BUILD
/// /* but currently used for storing
/// region-specific ITT */
/// /* contextual information. */
///#endif /* USE_ITT_BUILD */
/// kmp_int32 reserved_3; /**< source[4] in Fortran, do not use for
/// C++ */
/// char const *psource; /**< String describing the source location.
/// The string is composed of semi-colon separated
// fields which describe the source file,
/// the function and a pair of line numbers that
/// delimit the construct.
/// */
/// } ident_t;
enum IdentFieldIndex {
/// \brief might be used in Fortran
IdentField_Reserved_1,
/// \brief OMP_IDENT_xxx flags; OMP_IDENT_KMPC identifies this union member.
IdentField_Flags,
/// \brief Not really used in Fortran any more
IdentField_Reserved_2,
/// \brief Source[4] in Fortran, do not use for C++
IdentField_Reserved_3,
/// \brief String describing the source location. The string is composed of
/// semi-colon separated fields which describe the source file, the function
/// and a pair of line numbers that delimit the construct.
IdentField_PSource
};
llvm::StructType *IdentTy;
/// \brief Map for SourceLocation and OpenMP runtime library debug locations.
typedef llvm::DenseMap<unsigned, llvm::Value *> OpenMPDebugLocMapTy;
OpenMPDebugLocMapTy OpenMPDebugLocMap;
/// \brief The type for a microtask which gets passed to __kmpc_fork_call().
/// Original representation is:
/// typedef void (kmpc_micro)(kmp_int32 global_tid, kmp_int32 bound_tid,...);
llvm::FunctionType *Kmpc_MicroTy;
/// \brief Stores debug location and ThreadID for the function.
struct DebugLocThreadIdTy {
llvm::Value *DebugLoc;
llvm::Value *ThreadID;
};
/// \brief Map of local debug location, ThreadId and functions.
typedef llvm::DenseMap<llvm::Function *, DebugLocThreadIdTy>
OpenMPLocThreadIDMapTy;
OpenMPLocThreadIDMapTy OpenMPLocThreadIDMap;
/// \brief Type kmp_critical_name, originally defined as typedef kmp_int32
/// kmp_critical_name[8];
llvm::ArrayType *KmpCriticalNameTy;
/// \brief An ordered map of auto-generated variables to their unique names.
/// It stores variables with the following names: 1) ".gomp_critical_user_" +
/// <critical_section_name> + ".var" for "omp critical" directives; 2)
/// <mangled_name_for_global_var> + ".cache." for cache for threadprivate
/// variables.
llvm::StringMap<llvm::AssertingVH<llvm::Constant>, llvm::BumpPtrAllocator>
InternalVars;
/// \brief Type typedef kmp_int32 (* kmp_routine_entry_t)(kmp_int32, void *);
llvm::Type *KmpRoutineEntryPtrTy;
QualType KmpRoutineEntryPtrQTy;
/// \brief Build type kmp_routine_entry_t (if not built yet).
void emitKmpRoutineEntryT(QualType KmpInt32Ty);
/// \brief Emits object of ident_t type with info for source location.
/// \param Flags Flags for OpenMP location.
///
llvm::Value *emitUpdateLocation(CodeGenFunction &CGF, SourceLocation Loc,
OpenMPLocationFlags Flags = OMP_IDENT_KMPC);
/// \brief Returns pointer to ident_t type.
llvm::Type *getIdentTyPointerTy();
/// \brief Returns pointer to kmpc_micro type.
llvm::Type *getKmpc_MicroPointerTy();
/// \brief Returns specified OpenMP runtime function.
/// \param Function OpenMP runtime function.
/// \return Specified function.
llvm::Constant *createRuntimeFunction(OpenMPRTLFunction Function);
/// \brief Returns __kmpc_for_static_init_* runtime function for the specified
/// size \a IVSize and sign \a IVSigned.
llvm::Constant *createForStaticInitFunction(unsigned IVSize, bool IVSigned);
/// \brief Returns __kmpc_dispatch_init_* runtime function for the specified
/// size \a IVSize and sign \a IVSigned.
llvm::Constant *createDispatchInitFunction(unsigned IVSize, bool IVSigned);
/// \brief Returns __kmpc_dispatch_next_* runtime function for the specified
/// size \a IVSize and sign \a IVSigned.
llvm::Constant *createDispatchNextFunction(unsigned IVSize, bool IVSigned);
/// \brief Returns __kmpc_dispatch_fini_* runtime function for the specified
/// size \a IVSize and sign \a IVSigned.
llvm::Constant *createDispatchFiniFunction(unsigned IVSize, bool IVSigned);
/// \brief If the specified mangled name is not in the module, create and
/// return threadprivate cache object. This object is a pointer's worth of
/// storage that's reserved for use by the OpenMP runtime.
/// \param VD Threadprivate variable.
/// \return Cache variable for the specified threadprivate.
llvm::Constant *getOrCreateThreadPrivateCache(const VarDecl *VD);
/// \brief Emits address of the word in a memory where current thread id is
/// stored.
virtual llvm::Value *emitThreadIDAddress(CodeGenFunction &CGF,
SourceLocation Loc);
/// \brief Gets thread id value for the current thread.
///
llvm::Value *getThreadID(CodeGenFunction &CGF, SourceLocation Loc);
/// \brief Gets (if variable with the given name already exist) or creates
/// internal global variable with the specified Name. The created variable has
/// linkage CommonLinkage by default and is initialized by null value.
/// \param Ty Type of the global variable. If it is exist already the type
/// must be the same.
/// \param Name Name of the variable.
llvm::Constant *getOrCreateInternalVariable(llvm::Type *Ty,
const llvm::Twine &Name);
/// \brief Set of threadprivate variables with the generated initializer.
llvm::DenseSet<const VarDecl *> ThreadPrivateWithDefinition;
/// \brief Emits initialization code for the threadprivate variables.
/// \param VDAddr Address of the global variable \a VD.
/// \param Ctor Pointer to a global init function for \a VD.
/// \param CopyCtor Pointer to a global copy function for \a VD.
/// \param Dtor Pointer to a global destructor function for \a VD.
/// \param Loc Location of threadprivate declaration.
void emitThreadPrivateVarInit(CodeGenFunction &CGF, llvm::Value *VDAddr,
llvm::Value *Ctor, llvm::Value *CopyCtor,
llvm::Value *Dtor, SourceLocation Loc);
/// \brief Returns corresponding lock object for the specified critical region
/// name. If the lock object does not exist it is created, otherwise the
/// reference to the existing copy is returned.
/// \param CriticalName Name of the critical region.
///
llvm::Value *getCriticalRegionLock(StringRef CriticalName);
public:
explicit CGOpenMPRuntime(CodeGenModule &CGM);
virtual ~CGOpenMPRuntime() {}
virtual void clear();
/// \brief Emits outlined function for the specified OpenMP parallel directive
/// \a D. This outlined function has type void(*)(kmp_int32 *ThreadID,
/// kmp_int32 BoundID, struct context_vars*).
/// \param D OpenMP directive.
/// \param ThreadIDVar Variable for thread id in the current OpenMP region.
/// \param CodeGen Code generation sequence for the \a D directive.
virtual llvm::Value *
emitParallelOutlinedFunction(const OMPExecutableDirective &D,
const VarDecl *ThreadIDVar,
const RegionCodeGenTy &CodeGen);
/// \brief Emits outlined function for the OpenMP task directive \a D. This
/// outlined function has type void(*)(kmp_int32 ThreadID, kmp_int32
/// PartID, struct context_vars*).
/// \param D OpenMP directive.
/// \param ThreadIDVar Variable for thread id in the current OpenMP region.
/// \param CodeGen Code generation sequence for the \a D directive.
///
virtual llvm::Value *emitTaskOutlinedFunction(const OMPExecutableDirective &D,
const VarDecl *ThreadIDVar,
const RegionCodeGenTy &CodeGen);
/// \brief Cleans up references to the objects in finished function.
///
void functionFinished(CodeGenFunction &CGF);
/// \brief Emits code for parallel or serial call of the \a OutlinedFn with
/// variables captured in a record which address is stored in \a
/// CapturedStruct.
/// \param OutlinedFn Outlined function to be run in parallel threads. Type of
/// this function is void(*)(kmp_int32 *, kmp_int32, struct context_vars*).
/// \param CapturedStruct A pointer to the record with the references to
/// variables used in \a OutlinedFn function.
/// \param IfCond Condition in the associated 'if' clause, if it was
/// specified, nullptr otherwise.
///
virtual void emitParallelCall(CodeGenFunction &CGF, SourceLocation Loc,
llvm::Value *OutlinedFn,
llvm::Value *CapturedStruct,
const Expr *IfCond);
/// \brief Emits a critical region.
/// \param CriticalName Name of the critical region.
/// \param CriticalOpGen Generator for the statement associated with the given
/// critical region.
virtual void emitCriticalRegion(CodeGenFunction &CGF, StringRef CriticalName,
const RegionCodeGenTy &CriticalOpGen,
SourceLocation Loc);
/// \brief Emits a master region.
/// \param MasterOpGen Generator for the statement associated with the given
/// master region.
virtual void emitMasterRegion(CodeGenFunction &CGF,
const RegionCodeGenTy &MasterOpGen,
SourceLocation Loc);
/// \brief Emits code for a taskyield directive.
virtual void emitTaskyieldCall(CodeGenFunction &CGF, SourceLocation Loc);
/// \brief Emits a single region.
/// \param SingleOpGen Generator for the statement associated with the given
/// single region.
virtual void emitSingleRegion(CodeGenFunction &CGF,
const RegionCodeGenTy &SingleOpGen,
SourceLocation Loc,
ArrayRef<const Expr *> CopyprivateVars,
ArrayRef<const Expr *> DestExprs,
ArrayRef<const Expr *> SrcExprs,
ArrayRef<const Expr *> AssignmentOps);
/// \brief Emit an ordered region.
/// \param OrderedOpGen Generator for the statement associated with the given
/// critical region.
virtual void emitOrderedRegion(CodeGenFunction &CGF,
const RegionCodeGenTy &OrderedOpGen,
SourceLocation Loc);
/// \brief Emit an implicit/explicit barrier for OpenMP threads.
/// \param Kind Directive for which this implicit barrier call must be
/// generated. Must be OMPD_barrier for explicit barrier generation.
///
virtual void emitBarrierCall(CodeGenFunction &CGF, SourceLocation Loc,
OpenMPDirectiveKind Kind);
/// \brief Check if the specified \a ScheduleKind is static non-chunked.
/// This kind of worksharing directive is emitted without outer loop.
/// \param ScheduleKind Schedule kind specified in the 'schedule' clause.
/// \param Chunked True if chunk is specified in the clause.
///
virtual bool isStaticNonchunked(OpenMPScheduleClauseKind ScheduleKind,
bool Chunked) const;
/// \brief Check if the specified \a ScheduleKind is dynamic.
/// This kind of worksharing directive is emitted without outer loop.
/// \param ScheduleKind Schedule Kind specified in the 'schedule' clause.
///
virtual bool isDynamic(OpenMPScheduleClauseKind ScheduleKind) const;
/// \brief Call the appropriate runtime routine to initialize it before start
/// of loop.
///
/// Depending on the loop schedule, it is nesessary to call some runtime
/// routine before start of the OpenMP loop to get the loop upper / lower
/// bounds \a LB and \a UB and stride \a ST.
///
/// \param CGF Reference to current CodeGenFunction.
/// \param Loc Clang source location.
/// \param SchedKind Schedule kind, specified by the 'schedule' clause.
/// \param IVSize Size of the iteration variable in bits.
/// \param IVSigned Sign of the interation variable.
/// \param IL Address of the output variable in which the flag of the
/// last iteration is returned.
/// \param LB Address of the output variable in which the lower iteration
/// number is returned.
/// \param UB Address of the output variable in which the upper iteration
/// number is returned.
/// \param ST Address of the output variable in which the stride value is
/// returned nesessary to generated the static_chunked scheduled loop.
/// \param Chunk Value of the chunk for the static_chunked scheduled loop.
/// For the default (nullptr) value, the chunk 1 will be used.
///
virtual void emitForInit(CodeGenFunction &CGF, SourceLocation Loc,
OpenMPScheduleClauseKind SchedKind, unsigned IVSize,
bool IVSigned, llvm::Value *IL, llvm::Value *LB,
llvm::Value *UB, llvm::Value *ST,
llvm::Value *Chunk = nullptr);
/// \brief Call the appropriate runtime routine to notify that we finished
/// iteration of the ordered loop with the dynamic scheduling.
///
/// \param CGF Reference to current CodeGenFunction.
/// \param Loc Clang source location.
/// \param IVSize Size of the iteration variable in bits.
/// \param IVSigned Sign of the interation variable.
///
virtual void emitForOrderedDynamicIterationEnd(CodeGenFunction &CGF,
SourceLocation Loc,
unsigned IVSize,
bool IVSigned);
/// \brief Call the appropriate runtime routine to notify that we finished
/// all the work with current loop.
///
/// \param CGF Reference to current CodeGenFunction.
/// \param Loc Clang source location.
///
virtual void emitForStaticFinish(CodeGenFunction &CGF, SourceLocation Loc);
/// Call __kmpc_dispatch_next(
/// ident_t *loc, kmp_int32 tid, kmp_int32 *p_lastiter,
/// kmp_int[32|64] *p_lower, kmp_int[32|64] *p_upper,
/// kmp_int[32|64] *p_stride);
/// \param IVSize Size of the iteration variable in bits.
/// \param IVSigned Sign of the interation variable.
/// \param IL Address of the output variable in which the flag of the
/// last iteration is returned.
/// \param LB Address of the output variable in which the lower iteration
/// number is returned.
/// \param UB Address of the output variable in which the upper iteration
/// number is returned.
/// \param ST Address of the output variable in which the stride value is
/// returned.
virtual llvm::Value *emitForNext(CodeGenFunction &CGF, SourceLocation Loc,
unsigned IVSize, bool IVSigned,
llvm::Value *IL, llvm::Value *LB,
llvm::Value *UB, llvm::Value *ST);
/// \brief Emits call to void __kmpc_push_num_threads(ident_t *loc, kmp_int32
/// global_tid, kmp_int32 num_threads) to generate code for 'num_threads'
/// clause.
/// \param NumThreads An integer value of threads.
virtual void emitNumThreadsClause(CodeGenFunction &CGF,
llvm::Value *NumThreads,
SourceLocation Loc);
/// \brief Returns address of the threadprivate variable for the current
/// thread.
/// \param VD Threadprivate variable.
/// \param VDAddr Address of the global variable \a VD.
/// \param Loc Location of the reference to threadprivate var.
/// \return Address of the threadprivate variable for the current thread.
virtual llvm::Value *getAddrOfThreadPrivate(CodeGenFunction &CGF,
const VarDecl *VD,
llvm::Value *VDAddr,
SourceLocation Loc);
/// \brief Emit a code for initialization of threadprivate variable. It emits
/// a call to runtime library which adds initial value to the newly created
/// threadprivate variable (if it is not constant) and registers destructor
/// for the variable (if any).
/// \param VD Threadprivate variable.
/// \param VDAddr Address of the global variable \a VD.
/// \param Loc Location of threadprivate declaration.
/// \param PerformInit true if initialization expression is not constant.
virtual llvm::Function *
emitThreadPrivateVarDefinition(const VarDecl *VD, llvm::Value *VDAddr,
SourceLocation Loc, bool PerformInit,
CodeGenFunction *CGF = nullptr);
/// \brief Emit flush of the variables specified in 'omp flush' directive.
/// \param Vars List of variables to flush.
virtual void emitFlush(CodeGenFunction &CGF, ArrayRef<const Expr *> Vars,
SourceLocation Loc);
/// \brief Emit task region for the task directive. The task region is
/// emmitted in several steps:
/// 1. Emit a call to kmp_task_t *__kmpc_omp_task_alloc(ident_t *, kmp_int32
/// gtid, kmp_int32 flags, size_t sizeof_kmp_task_t, size_t sizeof_shareds,
/// kmp_routine_entry_t *task_entry). Here task_entry is a pointer to the
/// function:
/// kmp_int32 .omp_task_entry.(kmp_int32 gtid, kmp_task_t *tt) {
/// TaskFunction(gtid, tt->part_id, tt->shareds);
/// return 0;
/// }
/// 2. Copy a list of shared variables to field shareds of the resulting
/// structure kmp_task_t returned by the previous call (if any).
/// 3. Copy a pointer to destructions function to field destructions of the
/// resulting structure kmp_task_t.
/// 4. Emit a call to kmp_int32 __kmpc_omp_task(ident_t *, kmp_int32 gtid,
/// kmp_task_t *new_task), where new_task is a resulting structure from
/// previous items.
/// \param Tied true if the task is tied (the task is tied to the thread that
/// can suspend its task region), false - untied (the task is not tied to any
/// thread).
/// \param Final Contains either constant bool value, or llvm::Value * of i1
/// type for final clause. If the value is true, the task forces all of its
/// child tasks to become final and included tasks.
/// \param TaskFunction An LLVM function with type void (*)(i32 /*gtid*/, i32
/// /*part_id*/, captured_struct */*__context*/);
/// \param SharedsTy A type which contains references the shared variables.
/// \param Shareds Context with the list of shared variables from the \a
/// TaskFunction.
/// \param IfCond Not a nullptr if 'if' clause was specified, nullptr
/// otherwise.
virtual void emitTaskCall(CodeGenFunction &CGF, SourceLocation Loc, bool Tied,
llvm::PointerIntPair<llvm::Value *, 1, bool> Final,
llvm::Value *TaskFunction, QualType SharedsTy,
llvm::Value *Shareds, const Expr *IfCond);
/// \brief Emit code for the directive that does not require outlining.
///
/// \param CodeGen Code generation sequence for the \a D directive.
virtual void emitInlinedDirective(CodeGenFunction &CGF,
const RegionCodeGenTy &CodeGen);
/// \brief Emit a code for reduction clause. Next code should be emitted for
/// reduction:
/// \code
///
/// static kmp_critical_name lock = { 0 };
///
/// void reduce_func(void *lhs[<n>], void *rhs[<n>]) {
/// ...
/// *(Type<i>*)lhs[i] = RedOp<i>(*(Type<i>*)lhs[i], *(Type<i>*)rhs[i]);
/// ...
/// }
///
/// ...
/// void *RedList[<n>] = {&<RHSExprs>[0], ..., &<RHSExprs>[<n>-1]};
/// switch (__kmpc_reduce{_nowait}(<loc>, <gtid>, <n>, sizeof(RedList),
/// RedList, reduce_func, &<lock>)) {
/// case 1:
/// ...
/// <LHSExprs>[i] = RedOp<i>(*<LHSExprs>[i], *<RHSExprs>[i]);
/// ...
/// __kmpc_end_reduce{_nowait}(<loc>, <gtid>, &<lock>);
/// break;
/// case 2:
/// ...
/// Atomic(<LHSExprs>[i] = RedOp<i>(*<LHSExprs>[i], *<RHSExprs>[i]));
/// ...
/// break;
/// default:;
/// }
/// \endcode
///
/// \param LHSExprs List of LHS in \a ReductionOps reduction operations.
/// \param RHSExprs List of RHS in \a ReductionOps reduction operations.
/// \param ReductionOps List of reduction operations in form 'LHS binop RHS'
/// or 'operator binop(LHS, RHS)'.
/// \param WithNowait true if parent directive has also nowait clause, false
/// otherwise.
virtual void emitReduction(CodeGenFunction &CGF, SourceLocation Loc,
ArrayRef<const Expr *> LHSExprs,
ArrayRef<const Expr *> RHSExprs,
ArrayRef<const Expr *> ReductionOps,
bool WithNowait);
/// \brief Emit code for 'taskwait' directive.
virtual void emitTaskwaitCall(CodeGenFunction &CGF, SourceLocation Loc);
};
} // namespace CodeGen
} // namespace clang
#endif
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