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- /*
- * Copyright 2016-present Facebook, Inc.
- *
- * Licensed under the Apache License, Version 2.0 (the "License");
- * you may not use this file except in compliance with the License.
- * You may obtain a copy of the License at
- *
- * http://www.apache.org/licenses/LICENSE-2.0
- *
- * Unless required by applicable law or agreed to in writing, software
- * distributed under the License is distributed on an "AS IS" BASIS,
- * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
- * See the License for the specific language governing permissions and
- * limitations under the License.
- */
- #pragma once
- // clang-format off
- #include <cstddef>
- // Default constraint for the probe arguments as operands.
- #ifndef FOLLY_SDT_ARG_CONSTRAINT
- #define FOLLY_SDT_ARG_CONSTRAINT "nor"
- #endif
- // Instruction to emit for the probe.
- #define FOLLY_SDT_NOP nop
- // Note section properties.
- #define FOLLY_SDT_NOTE_NAME "stapsdt"
- #define FOLLY_SDT_NOTE_TYPE 3
- // Semaphore variables are put in this section
- #define FOLLY_SDT_SEMAPHORE_SECTION ".probes"
- // Size of address depending on platform.
- #ifdef __LP64__
- #define FOLLY_SDT_ASM_ADDR .8byte
- #else
- #define FOLLY_SDT_ASM_ADDR .4byte
- #endif
- // Assembler helper Macros.
- #define FOLLY_SDT_S(x) #x
- #define FOLLY_SDT_ASM_1(x) FOLLY_SDT_S(x) "\n"
- #define FOLLY_SDT_ASM_2(a, b) FOLLY_SDT_S(a) "," FOLLY_SDT_S(b) "\n"
- #define FOLLY_SDT_ASM_3(a, b, c) FOLLY_SDT_S(a) "," FOLLY_SDT_S(b) "," \
- FOLLY_SDT_S(c) "\n"
- #define FOLLY_SDT_ASM_STRING(x) FOLLY_SDT_ASM_1(.asciz FOLLY_SDT_S(x))
- // Helper to determine the size of an argument.
- #define FOLLY_SDT_IS_ARRAY_POINTER(x) ((__builtin_classify_type(x) == 14) || \
- (__builtin_classify_type(x) == 5))
- #define FOLLY_SDT_ARGSIZE(x) (FOLLY_SDT_IS_ARRAY_POINTER(x) \
- ? sizeof(void*) \
- : sizeof(x))
- // Format of each probe arguments as operand.
- // Size of the arugment tagged with FOLLY_SDT_Sn, with "n" constraint.
- // Value of the argument tagged with FOLLY_SDT_An, with configured constraint.
- #define FOLLY_SDT_ARG(n, x) \
- [FOLLY_SDT_S##n] "n" ((size_t)FOLLY_SDT_ARGSIZE(x)), \
- [FOLLY_SDT_A##n] FOLLY_SDT_ARG_CONSTRAINT (x)
- // Templates to append arguments as operands.
- #define FOLLY_SDT_OPERANDS_0() [__sdt_dummy] "g" (0)
- #define FOLLY_SDT_OPERANDS_1(_1) FOLLY_SDT_ARG(1, _1)
- #define FOLLY_SDT_OPERANDS_2(_1, _2) \
- FOLLY_SDT_OPERANDS_1(_1), FOLLY_SDT_ARG(2, _2)
- #define FOLLY_SDT_OPERANDS_3(_1, _2, _3) \
- FOLLY_SDT_OPERANDS_2(_1, _2), FOLLY_SDT_ARG(3, _3)
- #define FOLLY_SDT_OPERANDS_4(_1, _2, _3, _4) \
- FOLLY_SDT_OPERANDS_3(_1, _2, _3), FOLLY_SDT_ARG(4, _4)
- #define FOLLY_SDT_OPERANDS_5(_1, _2, _3, _4, _5) \
- FOLLY_SDT_OPERANDS_4(_1, _2, _3, _4), FOLLY_SDT_ARG(5, _5)
- #define FOLLY_SDT_OPERANDS_6(_1, _2, _3, _4, _5, _6) \
- FOLLY_SDT_OPERANDS_5(_1, _2, _3, _4, _5), FOLLY_SDT_ARG(6, _6)
- #define FOLLY_SDT_OPERANDS_7(_1, _2, _3, _4, _5, _6, _7) \
- FOLLY_SDT_OPERANDS_6(_1, _2, _3, _4, _5, _6), FOLLY_SDT_ARG(7, _7)
- #define FOLLY_SDT_OPERANDS_8(_1, _2, _3, _4, _5, _6, _7, _8) \
- FOLLY_SDT_OPERANDS_7(_1, _2, _3, _4, _5, _6, _7), FOLLY_SDT_ARG(8, _8)
- #define FOLLY_SDT_OPERANDS_9(_1, _2, _3, _4, _5, _6, _7, _8, _9) \
- FOLLY_SDT_OPERANDS_8(_1, _2, _3, _4, _5, _6, _7, _8), FOLLY_SDT_ARG(9, _9)
- // Templates to reference the arguments from operands in note section.
- #define FOLLY_SDT_ARGFMT(no) %n[FOLLY_SDT_S##no]@%[FOLLY_SDT_A##no]
- #define FOLLY_SDT_ARG_TEMPLATE_0 /*No arguments*/
- #define FOLLY_SDT_ARG_TEMPLATE_1 FOLLY_SDT_ARGFMT(1)
- #define FOLLY_SDT_ARG_TEMPLATE_2 FOLLY_SDT_ARG_TEMPLATE_1 FOLLY_SDT_ARGFMT(2)
- #define FOLLY_SDT_ARG_TEMPLATE_3 FOLLY_SDT_ARG_TEMPLATE_2 FOLLY_SDT_ARGFMT(3)
- #define FOLLY_SDT_ARG_TEMPLATE_4 FOLLY_SDT_ARG_TEMPLATE_3 FOLLY_SDT_ARGFMT(4)
- #define FOLLY_SDT_ARG_TEMPLATE_5 FOLLY_SDT_ARG_TEMPLATE_4 FOLLY_SDT_ARGFMT(5)
- #define FOLLY_SDT_ARG_TEMPLATE_6 FOLLY_SDT_ARG_TEMPLATE_5 FOLLY_SDT_ARGFMT(6)
- #define FOLLY_SDT_ARG_TEMPLATE_7 FOLLY_SDT_ARG_TEMPLATE_6 FOLLY_SDT_ARGFMT(7)
- #define FOLLY_SDT_ARG_TEMPLATE_8 FOLLY_SDT_ARG_TEMPLATE_7 FOLLY_SDT_ARGFMT(8)
- #define FOLLY_SDT_ARG_TEMPLATE_9 FOLLY_SDT_ARG_TEMPLATE_8 FOLLY_SDT_ARGFMT(9)
- // Semaphore define, declare and probe note format
- #define FOLLY_SDT_SEMAPHORE(provider, name) \
- folly_sdt_semaphore_##provider##_##name
- #define FOLLY_SDT_DEFINE_SEMAPHORE(provider, name) \
- extern "C" { \
- volatile unsigned short FOLLY_SDT_SEMAPHORE(provider, name) \
- __attribute__((section(FOLLY_SDT_SEMAPHORE_SECTION), used)) = 0; \
- }
- #define FOLLY_SDT_DECLARE_SEMAPHORE(provider, name) \
- extern "C" volatile unsigned short FOLLY_SDT_SEMAPHORE(provider, name)
- #define FOLLY_SDT_SEMAPHORE_NOTE_0(provider, name) \
- FOLLY_SDT_ASM_1( FOLLY_SDT_ASM_ADDR 0) /*No Semaphore*/ \
- #define FOLLY_SDT_SEMAPHORE_NOTE_1(provider, name) \
- FOLLY_SDT_ASM_1(FOLLY_SDT_ASM_ADDR FOLLY_SDT_SEMAPHORE(provider, name))
- // Structure of note section for the probe.
- #define FOLLY_SDT_NOTE_CONTENT(provider, name, has_semaphore, arg_template) \
- FOLLY_SDT_ASM_1(990: FOLLY_SDT_NOP) \
- FOLLY_SDT_ASM_3( .pushsection .note.stapsdt,"","note") \
- FOLLY_SDT_ASM_1( .balign 4) \
- FOLLY_SDT_ASM_3( .4byte 992f-991f, 994f-993f, FOLLY_SDT_NOTE_TYPE) \
- FOLLY_SDT_ASM_1(991: .asciz FOLLY_SDT_NOTE_NAME) \
- FOLLY_SDT_ASM_1(992: .balign 4) \
- FOLLY_SDT_ASM_1(993: FOLLY_SDT_ASM_ADDR 990b) \
- FOLLY_SDT_ASM_1( FOLLY_SDT_ASM_ADDR 0) /*Reserved for Base Address*/ \
- FOLLY_SDT_SEMAPHORE_NOTE_##has_semaphore(provider, name) \
- FOLLY_SDT_ASM_STRING(provider) \
- FOLLY_SDT_ASM_STRING(name) \
- FOLLY_SDT_ASM_STRING(arg_template) \
- FOLLY_SDT_ASM_1(994: .balign 4) \
- FOLLY_SDT_ASM_1( .popsection)
- // Main probe Macro.
- #define FOLLY_SDT_PROBE(provider, name, has_semaphore, n, arglist) \
- __asm__ __volatile__ ( \
- FOLLY_SDT_NOTE_CONTENT( \
- provider, name, has_semaphore, FOLLY_SDT_ARG_TEMPLATE_##n) \
- :: FOLLY_SDT_OPERANDS_##n arglist \
- ) \
- // Helper Macros to handle variadic arguments.
- #define FOLLY_SDT_NARG_(_0, _1, _2, _3, _4, _5, _6, _7, _8, _9, N, ...) N
- #define FOLLY_SDT_NARG(...) \
- FOLLY_SDT_NARG_(__VA_ARGS__, 9, 8, 7, 6, 5, 4, 3, 2, 1, 0)
- #define FOLLY_SDT_PROBE_N(provider, name, has_semaphore, N, ...) \
- FOLLY_SDT_PROBE(provider, name, has_semaphore, N, (__VA_ARGS__))
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