| /*===---- instr_prof_interface.h - Instrumentation PGO User Program API ----=== | |
| * | |
| * Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions. | |
| * See https://llvm.org/LICENSE.txt for license information. | |
| * SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception | |
| * | |
| *===-----------------------------------------------------------------------=== | |
| * | |
| * This header provides a public interface for fine-grained control of counter | |
| * reset and profile dumping. These interface functions can be directly called | |
| * in user programs. | |
| * | |
| \*===---------------------------------------------------------------------===*/ | |
| extern "C" { | |
| // Profile file reset and dump interfaces. | |
| // When `-fprofile[-instr]-generate`/`-fcs-profile-generate` is in effect, | |
| // clang defines __LLVM_INSTR_PROFILE_GENERATE to pick up the API calls. | |
| /*! | |
| * \brief Set the filename for writing instrumentation data. | |
| * | |
| * Sets the filename to be used for subsequent calls to | |
| * \a __llvm_profile_write_file(). | |
| * | |
| * \c Name is not copied, so it must remain valid. Passing NULL resets the | |
| * filename logic to the default behaviour. | |
| * | |
| * Note: There may be multiple copies of the profile runtime (one for each | |
| * instrumented image/DSO). This API only modifies the filename within the | |
| * copy of the runtime available to the calling image. | |
| * | |
| * Warning: This is a no-op if continuous mode (\ref | |
| * __llvm_profile_is_continuous_mode_enabled) is on. The reason for this is | |
| * that in continuous mode, profile counters are mmap()'d to the profile at | |
| * program initialization time. Support for transferring the mmap'd profile | |
| * counts to a new file has not been implemented. | |
| */ | |
| void __llvm_profile_set_filename(const char *Name); | |
| /*! | |
| * \brief Interface to set all PGO counters to zero for the current process. | |
| * | |
| */ | |
| void __llvm_profile_reset_counters(void); | |
| /*! | |
| * \brief this is a wrapper interface to \c __llvm_profile_write_file. | |
| * After this interface is invoked, an already dumped flag will be set | |
| * so that profile won't be dumped again during program exit. | |
| * Invocation of interface __llvm_profile_reset_counters will clear | |
| * the flag. This interface is designed to be used to collect profile | |
| * data from user selected hot regions. The use model is | |
| * __llvm_profile_reset_counters(); | |
| * ... hot region 1 | |
| * __llvm_profile_dump(); | |
| * .. some other code | |
| * __llvm_profile_reset_counters(); | |
| * ... hot region 2 | |
| * __llvm_profile_dump(); | |
| * | |
| * It is expected that on-line profile merging is on with \c %m specifier | |
| * used in profile filename . If merging is not turned on, user is expected | |
| * to invoke __llvm_profile_set_filename to specify different profile names | |
| * for different regions before dumping to avoid profile write clobbering. | |
| */ | |
| int __llvm_profile_dump(void); | |
| } // extern "C" | |