1 // Copyright 2016 the V8 project authors. All rights reserved. 2 // Use of this source code is governed by a BSD-style license that can be 3 // found in the LICENSE file. 4 5 #ifndef V8_CODEGEN_EXTERNAL_REFERENCE_TABLE_H_ 6 #define V8_CODEGEN_EXTERNAL_REFERENCE_TABLE_H_ 7 8 #include <vector> 9 10 #include "src/builtins/accessors.h" 11 #include "src/builtins/builtins.h" 12 #include "src/codegen/external-reference.h" 13 #include "src/logging/counters-definitions.h" 14 15 namespace v8 { 16 namespace internal { 17 18 class Isolate; 19 20 // ExternalReferenceTable is a helper class that defines the relationship 21 // between external references and their encodings. It is used to build 22 // hashmaps in ExternalReferenceEncoder and ExternalReferenceDecoder. 23 class ExternalReferenceTable { 24 public: 25 // For the nullptr ref, see the constructor. 26 static constexpr int kSpecialReferenceCount = 1; 27 static constexpr int kExternalReferenceCount = 28 ExternalReference::kExternalReferenceCount; 29 static constexpr int kBuiltinsReferenceCount = 30 #define COUNT_C_BUILTIN(...) +1 31 BUILTIN_LIST_C(COUNT_C_BUILTIN); 32 #undef COUNT_C_BUILTIN 33 static constexpr int kRuntimeReferenceCount = 34 Runtime::kNumFunctions - 35 Runtime::kNumInlineFunctions; // Don't count dupe kInline... functions. 36 static constexpr int kIsolateAddressReferenceCount = kIsolateAddressCount; 37 static constexpr int kAccessorReferenceCount = 38 Accessors::kAccessorInfoCount + Accessors::kAccessorSetterCount; 39 // The number of stub cache external references, see AddStubCache. 40 static constexpr int kStubCacheReferenceCount = 12; 41 static constexpr int kStatsCountersReferenceCount = 42 #define SC(...) +1 43 STATS_COUNTER_NATIVE_CODE_LIST(SC); 44 #undef SC 45 static constexpr int kSize = 46 kSpecialReferenceCount + kExternalReferenceCount + 47 kBuiltinsReferenceCount + kRuntimeReferenceCount + 48 kIsolateAddressReferenceCount + kAccessorReferenceCount + 49 kStubCacheReferenceCount + kStatsCountersReferenceCount; 50 static constexpr uint32_t kEntrySize = 51 static_cast<uint32_t>(kSystemPointerSize); 52 static constexpr uint32_t kSizeInBytes = kSize * kEntrySize + 2 * kUInt32Size; 53 address(uint32_t i)54 Address address(uint32_t i) const { return ref_addr_[i]; } name(uint32_t i)55 const char* name(uint32_t i) const { return ref_name_[i]; } 56 is_initialized()57 bool is_initialized() const { return is_initialized_ != 0; } 58 59 static const char* ResolveSymbol(void* address); 60 OffsetOfEntry(uint32_t i)61 static constexpr uint32_t OffsetOfEntry(uint32_t i) { 62 // Used in CodeAssembler::LookupExternalReference. 63 return i * kEntrySize; 64 } 65 NameFromOffset(uint32_t offset)66 const char* NameFromOffset(uint32_t offset) { 67 DCHECK_EQ(offset % kEntrySize, 0); 68 DCHECK_LT(offset, kSizeInBytes); 69 int index = offset / kEntrySize; 70 return name(index); 71 } 72 73 ExternalReferenceTable() = default; 74 void Init(Isolate* isolate); 75 76 private: 77 void Add(Address address, int* index); 78 79 void AddReferences(Isolate* isolate, int* index); 80 void AddBuiltins(int* index); 81 void AddRuntimeFunctions(int* index); 82 void AddIsolateAddresses(Isolate* isolate, int* index); 83 void AddAccessors(int* index); 84 void AddStubCache(Isolate* isolate, int* index); 85 86 Address GetStatsCounterAddress(StatsCounter* counter); 87 void AddNativeCodeStatsCounters(Isolate* isolate, int* index); 88 89 STATIC_ASSERT(sizeof(Address) == kEntrySize); 90 Address ref_addr_[kSize]; 91 static const char* const ref_name_[kSize]; 92 93 // Not bool to guarantee deterministic size. 94 uint32_t is_initialized_ = 0; 95 96 // Redirect disabled stats counters to this field. This is done to make sure 97 // we can have a snapshot that includes native counters even when the embedder 98 // isn't collecting them. 99 // This field is uint32_t since the MacroAssembler and CodeStubAssembler 100 // accesses this field as a uint32_t. 101 uint32_t dummy_stats_counter_ = 0; 102 103 DISALLOW_COPY_AND_ASSIGN(ExternalReferenceTable); 104 }; 105 106 STATIC_ASSERT(ExternalReferenceTable::kSizeInBytes == 107 sizeof(ExternalReferenceTable)); 108 109 } // namespace internal 110 } // namespace v8 111 #endif // V8_CODEGEN_EXTERNAL_REFERENCE_TABLE_H_ 112