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