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/*===- InstrProfiling.h- Support library for PGO instrumentation ----------===*\
|*
|* 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
|*
\*===----------------------------------------------------------------------===*/
#ifndef PROFILE_INSTRPROFILING_H_
#define PROFILE_INSTRPROFILING_H_
#include "InstrProfilingPort.h"
#include <stdio.h>
#define INSTR_PROF_VISIBILITY COMPILER_RT_VISIBILITY
#include "profile/InstrProfData.inc"
enum ValueKind {
#define VALUE_PROF_KIND(Enumerator, Value, Descr) Enumerator = Value,
#include "profile/InstrProfData.inc"
};
typedef void *IntPtrT;
typedef struct COMPILER_RT_ALIGNAS(INSTR_PROF_DATA_ALIGNMENT)
__llvm_profile_data {
#define INSTR_PROF_DATA(Type, LLVMType, Name, Initializer) Type Name;
#include "profile/InstrProfData.inc"
} __llvm_profile_data;
typedef struct __llvm_profile_header {
#define INSTR_PROF_RAW_HEADER(Type, Name, Initializer) Type Name;
#include "profile/InstrProfData.inc"
} __llvm_profile_header;
typedef struct ValueProfNode * PtrToNodeT;
typedef struct ValueProfNode {
#define INSTR_PROF_VALUE_NODE(Type, LLVMType, Name, Initializer) Type Name;
#include "profile/InstrProfData.inc"
} ValueProfNode;
/*!
* \brief Return 1 if profile counters are continuously synced to the raw
* profile via an mmap(). This is in contrast to the default mode, in which
* the raw profile is written out at program exit time.
*/
int __llvm_profile_is_continuous_mode_enabled(void);
/*!
* \brief Enable continuous mode.
*
* See \ref __llvm_profile_is_continuous_mode_enabled. The behavior is undefined
* if continuous mode is already enabled, or if it cannot be enable due to
* conflicting options.
*/
void __llvm_profile_enable_continuous_mode(void);
/*!
* \brief Set the page size.
*
* This is a pre-requisite for enabling continuous mode. The buffer size
* calculation code inside of libprofile cannot simply call getpagesize(), as
* it is not allowed to depend on libc.
*/
void __llvm_profile_set_page_size(unsigned PageSize);
/*!
* \brief Get number of bytes necessary to pad the argument to eight
* byte boundary.
*/
uint8_t __llvm_profile_get_num_padding_bytes(uint64_t SizeInBytes);
/*!
* \brief Get required size for profile buffer.
*/
uint64_t __llvm_profile_get_size_for_buffer(void);
/*!
* \brief Write instrumentation data to the given buffer.
*
* \pre \c Buffer is the start of a buffer at least as big as \a
* __llvm_profile_get_size_for_buffer().
*/
int __llvm_profile_write_buffer(char *Buffer);
const __llvm_profile_data *__llvm_profile_begin_data(void);
const __llvm_profile_data *__llvm_profile_end_data(void);
const char *__llvm_profile_begin_names(void);
const char *__llvm_profile_end_names(void);
char *__llvm_profile_begin_counters(void);
char *__llvm_profile_end_counters(void);
ValueProfNode *__llvm_profile_begin_vnodes();
ValueProfNode *__llvm_profile_end_vnodes();
uint32_t *__llvm_profile_begin_orderfile();
/*!
* \brief Clear profile counters to zero.
*
*/
void __llvm_profile_reset_counters(void);
/*!
* \brief Merge profile data from buffer.
*
* Read profile data form buffer \p Profile and merge with in-process profile
* counters. The client is expected to have checked or already knows the profile
* data in the buffer matches the in-process counter structure before calling
* it. Returns 0 (success) if the profile data is valid. Upon reading
* invalid/corrupted profile data, returns 1 (failure).
*/
int __llvm_profile_merge_from_buffer(const char *Profile, uint64_t Size);
/*! \brief Check if profile in buffer matches the current binary.
*
* Returns 0 (success) if the profile data in buffer \p Profile with size
* \p Size was generated by the same binary and therefore matches
* structurally the in-process counters. If the profile data in buffer is
* not compatible, the interface returns 1 (failure).
*/
int __llvm_profile_check_compatibility(const char *Profile,
uint64_t Size);
/*!
* \brief Counts the number of times a target value is seen.
*
* Records the target value for the CounterIndex if not seen before. Otherwise,
* increments the counter associated w/ the target value.
* void __llvm_profile_instrument_target(uint64_t TargetValue, void *Data,
* uint32_t CounterIndex);
*/
void INSTR_PROF_VALUE_PROF_FUNC(
#define VALUE_PROF_FUNC_PARAM(ArgType, ArgName, ArgLLVMType) ArgType ArgName
#include "profile/InstrProfData.inc"
);
void __llvm_profile_instrument_target_value(uint64_t TargetValue, void *Data,
uint32_t CounterIndex,
uint64_t CounterValue);
/*!
* \brief Write instrumentation data to the current file.
*
* Writes to the file with the last name given to \a *
* __llvm_profile_set_filename(),
* or if it hasn't been called, the \c LLVM_PROFILE_FILE environment variable,
* or if that's not set, the last name set to INSTR_PROF_PROFILE_NAME_VAR,
* or if that's not set, \c "default.profraw".
*/
int __llvm_profile_write_file(void);
int __llvm_orderfile_write_file(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);
int __llvm_orderfile_dump(void);
/*!
* \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 Set the FILE object for writing instrumentation data. Return 0 if set
* successfully or return 1 if failed.
*
* Sets the FILE object to be used for subsequent calls to
* \a __llvm_profile_write_file(). The profile file name set by environment
* variable, command-line option, or calls to \a __llvm_profile_set_filename
* will be ignored.
*
* \c File will not be closed after a call to \a __llvm_profile_write_file() but
* it may be flushed. Passing NULL restores default behavior.
*
* If \c EnableMerge is nonzero, the runtime will always merge profiling data
* with the contents of the profiling file. If EnableMerge is zero, the runtime
* may still merge the data if it would have merged for another reason (for
* example, because of a %m specifier in the file name).
*
* Note: There may be multiple copies of the profile runtime (one for each
* instrumented image/DSO). This API only modifies the file object within the
* copy of the runtime available to the calling image.
*
* Warning: This is a no-op if EnableMerge is 0 in continuous mode (\ref
* __llvm_profile_is_continuous_mode_enabled), because disable merging requires
* copying the old profile file to new profile file and this function is usually
* used when the proess doesn't have permission to open file.
*/
int __llvm_profile_set_file_object(FILE *File, int EnableMerge);
/*! \brief Register to write instrumentation data to file at exit. */
int __llvm_profile_register_write_file_atexit(void);
/*! \brief Initialize file handling. */
void __llvm_profile_initialize_file(void);
/*! \brief Initialize the profile runtime. */
void __llvm_profile_initialize(void);
/*!
* \brief Return path prefix (excluding the base filename) of the profile data.
* This is useful for users using \c -fprofile-generate=./path_prefix who do
* not care about the default raw profile name. It is also useful to collect
* more than more profile data files dumped in the same directory (Online
* merge mode is turned on for instrumented programs with shared libs).
* Side-effect: this API call will invoke malloc with dynamic memory allocation.
*/
const char *__llvm_profile_get_path_prefix();
/*!
* \brief Return filename (including path) of the profile data. Note that if the
* user calls __llvm_profile_set_filename later after invoking this interface,
* the actual file name may differ from what is returned here.
* Side-effect: this API call will invoke malloc with dynamic memory allocation
* (the returned pointer must be passed to `free` to avoid a leak).
*
* Note: There may be multiple copies of the profile runtime (one for each
* instrumented image/DSO). This API only retrieves the filename from the copy
* of the runtime available to the calling image.
*/
const char *__llvm_profile_get_filename();
/*! \brief Get the magic token for the file format. */
uint64_t __llvm_profile_get_magic(void);
/*! \brief Get the version of the file format. */
uint64_t __llvm_profile_get_version(void);
/*! \brief Get the number of entries in the profile data section. */
uint64_t __llvm_profile_get_num_data(const __llvm_profile_data *Begin,
const __llvm_profile_data *End);
/*! \brief Get the size of the profile data section in bytes. */
uint64_t __llvm_profile_get_data_size(const __llvm_profile_data *Begin,
const __llvm_profile_data *End);
/*! \brief Get the size in bytes of a single counter entry. */
size_t __llvm_profile_counter_entry_size(void);
/*! \brief Get the number of entries in the profile counters section. */
uint64_t __llvm_profile_get_num_counters(const char *Begin, const char *End);
/*! \brief Get the size of the profile counters section in bytes. */
uint64_t __llvm_profile_get_counters_size(const char *Begin, const char *End);
/* ! \brief Given the sizes of the data and counter information, return the
* number of padding bytes before and after the counters, and after the names,
* in the raw profile.
*
* Note: When mmap() mode is disabled, no padding bytes before/after counters
* are needed. However, in mmap() mode, the counter section in the raw profile
* must be page-aligned: this API computes the number of padding bytes
* needed to achieve that.
*/
void __llvm_profile_get_padding_sizes_for_counters(
uint64_t DataSize, uint64_t CountersSize, uint64_t NamesSize,
uint64_t *PaddingBytesBeforeCounters, uint64_t *PaddingBytesAfterCounters,
uint64_t *PaddingBytesAfterNames);
/*!
* \brief Set the flag that profile data has been dumped to the file.
* This is useful for users to disable dumping profile data to the file for
* certain processes in case the processes don't have permission to write to
* the disks, and trying to do so would result in side effects such as crashes.
*/
void __llvm_profile_set_dumped();
/*!
* This variable is defined in InstrProfilingRuntime.cpp as a hidden
* symbol. Its main purpose is to enable profile runtime user to
* bypass runtime initialization code -- if the client code explicitly
* define this variable, then InstProfileRuntime.o won't be linked in.
* Note that this variable's visibility needs to be hidden so that the
* definition of this variable in an instrumented shared library won't
* affect runtime initialization decision of the main program.
* __llvm_profile_profile_runtime. */
COMPILER_RT_VISIBILITY extern int INSTR_PROF_PROFILE_RUNTIME_VAR;
/*!
* This variable is defined in InstrProfilingVersionVar.c as a hidden symbol
* (except on Apple platforms where this symbol is checked by TAPI). Its main
* purpose is to encode the raw profile version value and other format related
* information such as whether the profile is from IR based instrumentation. The
* variable is defined as weak so that compiler can emit an overriding
* definition depending on user option.
*/
extern uint64_t INSTR_PROF_RAW_VERSION_VAR; /* __llvm_profile_raw_version */
/*!
* This variable is a weak symbol defined in InstrProfiling.c. It allows
* compiler instrumentation to provide overriding definition with value
* from compiler command line. This variable has default visibility.
*/
extern char INSTR_PROF_PROFILE_NAME_VAR[1]; /* __llvm_profile_filename. */
#endif /* PROFILE_INSTRPROFILING_H_ */