| // Copyright 2018 The Fuchsia Authors. All rights reserved. |
| // Use of this source code is governed by a BSD-style license that can be |
| // found in the LICENSE file. |
| |
| // Internal implementation of <trace/event_args.h>. |
| // This is not part of the public API: use <trace/event_args.h> instead. |
| |
| #ifndef ZIRCON_SYSTEM_ULIB_LIB_TRACE_INTERNAL_EVENT_ARGS_H_ |
| #define ZIRCON_SYSTEM_ULIB_LIB_TRACE_INTERNAL_EVENT_ARGS_H_ |
| |
| #include <assert.h> |
| |
| #include <zircon/compiler.h> |
| |
| #include <lib/trace-engine/context.h> |
| #include <lib/trace-engine/types.h> |
| #include <lib/trace/internal/pairs_internal.h> |
| |
| #define TRACE_INTERNAL_NUM_ARGS(variable_name) (sizeof(variable_name) / sizeof((variable_name)[0])) |
| |
| // Note: Argument names are processed in two steps. The first step is here |
| // where we store the string in |name_ref.inline_string|. The second step is |
| // done by |trace_internal_complete_args()| which is normally called by the |
| // helper routines that finish recording the event. |
| #define TRACE_INTERNAL_COUNT_ARGS(...) TRACE_INTERNAL_COUNT_PAIRS(__VA_ARGS__) |
| #define TRACE_INTERNAL_ALLOCATE_ARGS(var_name, args...) \ |
| trace_arg_t var_name[TRACE_INTERNAL_COUNT_ARGS(args)]; \ |
| static_assert(TRACE_INTERNAL_NUM_ARGS(var_name) <= TRACE_MAX_ARGS, "too many args") |
| |
| #ifdef __cplusplus |
| |
| #define TRACE_INTERNAL_SCOPE_ARG_LABEL(var_name, idx) __trace_arg_##var_name##idx |
| |
| #define TRACE_INTERNAL_HOLD_ARG(var_name, idx, name_literal, arg_value) \ |
| const auto& TRACE_INTERNAL_SCOPE_ARG_LABEL(var_name, idx) = (arg_value); |
| #define TRACE_INTERNAL_MAKE_ARG(var_name, idx, name_literal, arg_value) \ |
| { \ |
| .name_ref = {.encoded_value = 0, .inline_string = (name_literal)}, \ |
| .value = ::trace::internal::MakeArgumentValue(TRACE_INTERNAL_SCOPE_ARG_LABEL(var_name, idx)) \ |
| } |
| |
| #define TRACE_INTERNAL_DECLARE_ARGS(context, var_name, args...) \ |
| TRACE_INTERNAL_APPLY_PAIRWISE(TRACE_INTERNAL_HOLD_ARG, var_name, args) \ |
| trace_arg_t var_name[] = { \ |
| TRACE_INTERNAL_APPLY_PAIRWISE_CSV(TRACE_INTERNAL_MAKE_ARG, var_name, args)}; \ |
| static_assert(TRACE_INTERNAL_NUM_ARGS(var_name) <= TRACE_MAX_ARGS, "too many args") |
| |
| #define TRACE_INTERNAL_ASSIGN_ARG(var_name, idx, name_literal, arg_value) \ |
| var_name[idx - 1].name_ref.encoded_value = 0; \ |
| var_name[idx - 1].name_ref.inline_string = (name_literal); \ |
| var_name[idx - 1].value = \ |
| ::trace::internal::MakeArgumentValue(TRACE_INTERNAL_SCOPE_ARG_LABEL(var_name, idx)); |
| #define TRACE_INTERNAL_INIT_ARGS(var_name, args...) \ |
| TRACE_INTERNAL_APPLY_PAIRWISE(TRACE_INTERNAL_HOLD_ARG, var_name, args) \ |
| TRACE_INTERNAL_APPLY_PAIRWISE(TRACE_INTERNAL_ASSIGN_ARG, var_name, args) |
| |
| #else |
| |
| #define TRACE_INTERNAL_MAKE_ARG(var_name, idx, name_literal, arg_value) \ |
| { .name_ref = {.encoded_value = 0, .inline_string = (name_literal)}, .value = (arg_value) } |
| |
| #define TRACE_INTERNAL_DECLARE_ARGS(context, var_name, args...) \ |
| trace_arg_t var_name[] = { \ |
| TRACE_INTERNAL_APPLY_PAIRWISE_CSV(TRACE_INTERNAL_MAKE_ARG, var_name, args)}; \ |
| static_assert(TRACE_INTERNAL_NUM_ARGS(var_name) <= TRACE_MAX_ARGS, "too many args") |
| |
| #define TRACE_INTERNAL_ASSIGN_ARG(var_name, idx, name_literal, arg_value) \ |
| var_name[idx - 1].name_ref.encoded_value = 0; \ |
| var_name[idx - 1].name_ref.inline_string = (name_literal); \ |
| var_name[idx - 1].value = (arg_value); |
| #define TRACE_INTERNAL_INIT_ARGS(var_name, args...) \ |
| TRACE_INTERNAL_APPLY_PAIRWISE(TRACE_INTERNAL_ASSIGN_ARG, var_name, args) |
| #endif // __cplusplus |
| |
| __BEGIN_CDECLS |
| void trace_internal_complete_args(trace_context_t* context, trace_arg_t* args, size_t num_args); |
| __END_CDECLS |
| |
| #define TRACE_INTERNAL_COMPLETE_ARGS(context, args, num_args) \ |
| do { \ |
| trace_internal_complete_args((context), (args), (num_args)); \ |
| } while (0) |
| |
| #ifdef __cplusplus |
| |
| #include <lib/trace/internal/string_traits.h> |
| #include <type_traits> |
| |
| namespace trace { |
| namespace internal { |
| |
| template <typename T> |
| struct is_bool : public std::is_same<std::remove_cv_t<T>, bool> {}; |
| |
| // Helps construct trace argument values using SFINAE to coerce types. |
| template <typename T, typename Enable = void> |
| struct ArgumentValueMaker; |
| |
| template <> |
| struct ArgumentValueMaker<trace_arg_value_t> { |
| static trace_arg_value_t Make(trace_arg_value_t value) { return value; } |
| }; |
| |
| template <> |
| struct ArgumentValueMaker<decltype(nullptr)> { |
| static trace_arg_value_t Make(decltype(nullptr) value) { return trace_make_null_arg_value(); } |
| }; |
| |
| template <typename T> |
| struct ArgumentValueMaker<T, typename std::enable_if<is_bool<T>::value>::type> { |
| static trace_arg_value_t Make(bool value) { return trace_make_bool_arg_value(value); } |
| }; |
| |
| template <typename T> |
| struct ArgumentValueMaker< |
| T, typename std::enable_if<std::is_signed<T>::value && std::is_integral<T>::value && |
| (sizeof(T) <= sizeof(int32_t))>::type> { |
| static trace_arg_value_t Make(int32_t value) { return trace_make_int32_arg_value(value); } |
| }; |
| |
| template <typename T> |
| struct ArgumentValueMaker< |
| T, typename std::enable_if<!is_bool<T>::value && std::is_unsigned<T>::value && |
| !std::is_enum<T>::value && |
| (sizeof(T) <= sizeof(uint32_t))>::type> { |
| static trace_arg_value_t Make(uint32_t value) { return trace_make_uint32_arg_value(value); } |
| }; |
| |
| template <typename T> |
| struct ArgumentValueMaker< |
| T, typename std::enable_if<std::is_signed<T>::value && std::is_integral<T>::value && |
| (sizeof(T) > sizeof(int32_t)) && |
| (sizeof(T) <= sizeof(int64_t))>::type> { |
| static trace_arg_value_t Make(int64_t value) { return trace_make_int64_arg_value(value); } |
| }; |
| |
| template <typename T> |
| struct ArgumentValueMaker< |
| T, typename std::enable_if<std::is_unsigned<T>::value && |
| !std::is_enum<T>::value && |
| (sizeof(T) > sizeof(uint32_t)) && |
| (sizeof(T) <= sizeof(uint64_t))>::type> { |
| static trace_arg_value_t Make(uint64_t value) { return trace_make_uint64_arg_value(value); } |
| }; |
| |
| template <typename T> |
| struct ArgumentValueMaker<T, typename std::enable_if<std::is_enum<T>::value>::type> { |
| using UnderlyingType = typename std::underlying_type<T>::type; |
| static trace_arg_value_t Make(UnderlyingType value) { |
| return ArgumentValueMaker<UnderlyingType>::Make(value); |
| } |
| }; |
| |
| template <typename T> |
| struct ArgumentValueMaker<T, typename std::enable_if<std::is_floating_point<T>::value>::type> { |
| static trace_arg_value_t Make(double value) { return trace_make_double_arg_value(value); } |
| }; |
| |
| template <size_t n> |
| struct ArgumentValueMaker<char[n]> { |
| static trace_arg_value_t Make(const char* value) { |
| return trace_make_string_arg_value( |
| trace_make_inline_string_ref(value, value[n - 1] ? n : n - 1)); |
| } |
| }; |
| |
| template <> |
| struct ArgumentValueMaker<const char*> { |
| static trace_arg_value_t Make(const char* value) { |
| return trace_make_string_arg_value(trace_make_inline_c_string_ref(value)); |
| } |
| }; |
| |
| // Works with various string types including fbl::String, fbl::StringView, |
| // std::string, and std::string_view. |
| template <typename T> |
| struct ArgumentValueMaker< |
| T, typename std::enable_if<::trace::internal::is_string_like<T>::value>::type> { |
| static trace_arg_value_t Make(const T& value) { |
| return trace_make_string_arg_value(trace_make_inline_string_ref( |
| ::trace::internal::GetStringData(value), ::trace::internal::GetStringLength(value))); |
| } |
| }; |
| |
| template <typename T> |
| struct ArgumentValueMaker<T*> { |
| static trace_arg_value_t Make(const T* pointer) { |
| return trace_make_pointer_arg_value(reinterpret_cast<uintptr_t>(pointer)); |
| } |
| }; |
| |
| template <typename T> |
| trace_arg_value_t MakeArgumentValue(const T& value) { |
| return ArgumentValueMaker<T>::Make(value); |
| } |
| |
| } // namespace internal |
| } // namespace trace |
| |
| #endif // __cplusplus |
| |
| #endif // ZIRCON_SYSTEM_ULIB_LIB_TRACE_INTERNAL_EVENT_ARGS_H_ |