/* * 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 // 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__))