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Extract MemoryTag-related methods from common.
It is independent of TCMalloc's build options. PiperOrigin-RevId: 704807947 Change-Id: I79578679cdab0aa9e1433e05ad827d09a6e15057
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,44 @@ | ||
| // Copyright 2024 The TCMalloc Authors | ||
| // | ||
| // 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 | ||
| // | ||
| // https://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. | ||
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| #include "tcmalloc/internal/memory_tag.h" | ||
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| #include "absl/strings/string_view.h" | ||
| #include "tcmalloc/internal/config.h" | ||
| #include "tcmalloc/internal/optimization.h" | ||
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| GOOGLE_MALLOC_SECTION_BEGIN | ||
| namespace tcmalloc::tcmalloc_internal { | ||
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| absl::string_view MemoryTagToLabel(MemoryTag tag) { | ||
| switch (tag) { | ||
| case MemoryTag::kNormal: | ||
| return "NORMAL"; | ||
| case MemoryTag::kNormalP1: | ||
| return "NORMAL_P1"; | ||
| case MemoryTag::kSampled: | ||
| return "SAMPLED"; | ||
| case MemoryTag::kSelSan: | ||
| return "SELSAN"; | ||
| case MemoryTag::kCold: | ||
| return "COLD"; | ||
| case MemoryTag::kMetadata: | ||
| return "METADATA"; | ||
| } | ||
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| ASSUME(false); | ||
| } | ||
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| } // namespace tcmalloc::tcmalloc_internal | ||
| GOOGLE_MALLOC_SECTION_END |
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,89 @@ | ||
| // Copyright 2024 The TCMalloc Authors | ||
| // | ||
| // 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 | ||
| // | ||
| // https://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. | ||
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| #ifndef TCMALLOC_INTERNAL_MEMORY_TAG_H_ | ||
| #define TCMALLOC_INTERNAL_MEMORY_TAG_H_ | ||
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| #include <algorithm> | ||
| #include <cstdint> | ||
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| #include "absl/strings/string_view.h" | ||
| #include "tcmalloc/internal/config.h" | ||
| #include "tcmalloc/internal/logging.h" | ||
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| GOOGLE_MALLOC_SECTION_BEGIN | ||
| namespace tcmalloc::tcmalloc_internal { | ||
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| enum class MemoryTag : uint8_t { | ||
| // Sampled, infrequently allocated | ||
| kSampled = 0x0, | ||
| // Normal memory, NUMA partition 0 | ||
| kNormalP0 = kSanitizerAddressSpace ? 0x1 : 0x4, | ||
| // Normal memory, NUMA partition 1 | ||
| kNormalP1 = kSanitizerAddressSpace ? 0xff : 0x6, | ||
| // Normal memory | ||
| kNormal = kNormalP0, | ||
| // Cold | ||
| kCold = 0x2, | ||
| // Metadata | ||
| kMetadata = 0x3, | ||
| // SelSan sampled spans, kept separately because we need to quickly | ||
| // distinguish them from the rest during delete and they also consume | ||
| // shadow memory. 0xfe is an arbitrary value that shouldn't be used. | ||
| kSelSan = kSelSanPresent ? 0x1 : 0xfe, | ||
| }; | ||
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| inline constexpr uintptr_t kTagShift = std::min(kAddressBits - 4, 42); | ||
| inline constexpr uintptr_t kTagMask = | ||
| uintptr_t{kSanitizerAddressSpace ? 0x3 : 0x7} << kTagShift; | ||
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| inline MemoryTag GetMemoryTag(const void* ptr) { | ||
| return static_cast<MemoryTag>((reinterpret_cast<uintptr_t>(ptr) & kTagMask) >> | ||
| kTagShift); | ||
| } | ||
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| inline bool IsNormalMemory(const void* ptr) { | ||
| // This is slightly faster than checking kNormalP0/P1 separetly. | ||
| static_assert((static_cast<uint8_t>(MemoryTag::kNormalP0) & | ||
| (static_cast<uint8_t>(MemoryTag::kSampled) | | ||
| static_cast<uint8_t>(MemoryTag::kCold))) == 0); | ||
| bool res = (static_cast<uintptr_t>(GetMemoryTag(ptr)) & | ||
| static_cast<uintptr_t>(MemoryTag::kNormal)) != 0; | ||
| TC_ASSERT(res == (GetMemoryTag(ptr) == MemoryTag::kNormalP0 || | ||
| GetMemoryTag(ptr) == MemoryTag::kNormalP1), | ||
| "ptr=%p res=%d tag=%d", ptr, res, | ||
| static_cast<int>(GetMemoryTag(ptr))); | ||
| return res; | ||
| } | ||
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| inline bool IsSelSanMemory(const void* ptr) { | ||
| // This is a faster way to check for SelSan memory provided we already know | ||
| // it's not a normal memory, and assuming it's not kMetadata (both assumptions | ||
| // are checked by the assert below). A straightforward comparison with kSelSan | ||
| // leads to extraction/check of 2 bits (these use 2 8-byte immediates); | ||
| // this check can be done with a single BT instruction. | ||
| // kSelSanPresent part allows to optimize away branches in non SelSan build. | ||
| bool res = | ||
| kSelSanPresent && (static_cast<uintptr_t>(GetMemoryTag(ptr)) & | ||
| static_cast<uintptr_t>(MemoryTag::kSelSan)) != 0; | ||
| TC_ASSERT_EQ(res, GetMemoryTag(ptr) == MemoryTag::kSelSan); | ||
| return res; | ||
| } | ||
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| absl::string_view MemoryTagToLabel(MemoryTag tag); | ||
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| } // namespace tcmalloc::tcmalloc_internal | ||
| GOOGLE_MALLOC_SECTION_END | ||
|
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| #endif // TCMALLOC_INTERNAL_MEMORY_TAG_H_ |
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