| /* |
| * Copyright 2017 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 |
| |
| // Default constraint for the probe arguments as operands. |
| #ifndef FOLLY_SDT_ARG_CONSTRAINT |
| #if defined(__powerpc64__) || defined(__powerpc__) |
| #define FOLLY_SDT_ARG_CONSTRAINT "nZr" |
| #else |
| #define FOLLY_SDT_ARG_CONSTRAINT "nor" |
| #endif |
| #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 |
| |
| // 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_ISARRAY(x) (__builtin_classify_type(x) == 14) |
| #define FOLLY_SDT_ARGSIZE(x) (FOLLY_SDT_ISARRAY(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) |
| |
| // Templates to reference the arguments from operands in note section. |
| #if defined(__powerpc64__ ) || defined(__powerpc__) |
| #define FOLLY_SDT_ARGTMPL(id) %I[id]%[id] |
| #elif defined(__i386__) |
| #define FOLLY_SDT_ARGTMPL(id) %w[id] |
| #else |
| #define FOLLY_SDT_ARGTMPL(id) %[id] |
| #endif |
| #define FOLLY_SDT_ARGFMT(no) %n[FOLLY_SDT_S##no]@FOLLY_SDT_ARGTMPL(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) |
| |
| // Structure of note section for the probe. |
| #define FOLLY_SDT_NOTE_CONTENT(provider, name, 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 Semaphore address*/\ |
| FOLLY_SDT_ASM_1( FOLLY_SDT_ASM_ADDR 0) /*Reserved for Semaphore 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, n, arglist) \ |
| __asm__ __volatile__ ( \ |
| FOLLY_SDT_NOTE_CONTENT(provider, name, 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, N, ...) N |
| #define FOLLY_SDT_NARG(...) \ |
| FOLLY_SDT_NARG_(__VA_ARGS__, 8, 7, 6, 5, 4, 3, 2, 1, 0) |
| #define FOLLY_SDT_PROBE_N(provider, name, N, ...) \ |
| FOLLY_SDT_PROBE(provider, name, N, (__VA_ARGS__)) |
