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Side by Side Diff: src/wasm/wasm-module.h

Issue 1504713014: Initial import of v8-native WASM. (Closed) Base URL: https://chromium.googlesource.com/v8/v8.git@master
Patch Set: Created 5 years ago
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1 // Copyright 2015 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_WASM_MODULE_H_
6 #define V8_WASM_MODULE_H_
7
8 #include "src/wasm/wasm-opcodes.h"
9 #include "src/wasm/wasm-result.h"
10
11 #include "src/api.h"
12 #include "src/handles.h"
13
14 namespace v8 {
15 namespace internal {
16
17 namespace compiler {
18 class CallDescriptor;
19 }
20
21 namespace wasm {
22 const size_t kMaxModuleSize = 1024 * 1024 * 1024;
23 const size_t kMaxFunctionSize = 128 * 1024;
24 const size_t kMaxStringSize = 256;
25
26 enum WasmSectionDeclCode {
27 kDeclMemory = 0x00,
28 kDeclSignatures = 0x01,
29 kDeclFunctions = 0x02,
30 kDeclGlobals = 0x03,
31 kDeclDataSegments = 0x04,
32 kDeclFunctionTable = 0x05,
33 kDeclEnd = 0x06,
34 };
35
36 static const int kMaxModuleSectionCode = 6;
37
38 enum WasmFunctionDeclBit {
39 kDeclFunctionName = 0x01,
40 kDeclFunctionImport = 0x02,
41 kDeclFunctionLocals = 0x04,
42 kDeclFunctionExport = 0x08
43 };
44
45 // Constants for fixed-size elements within a module.
46 static const size_t kDeclMemorySize = 3;
47 static const size_t kDeclGlobalSize = 6;
48 static const size_t kDeclDataSegmentSize = 13;
49
50 // Static representation of a wasm function.
51 struct WasmFunction {
52 FunctionSig* sig; // signature of the function.
53 uint16_t sig_index; // index into the signature table.
54 uint32_t name_offset; // offset in the module bytes of the name, if any.
55 uint32_t code_start_offset; // offset in the module bytes of code start.
56 uint32_t code_end_offset; // offset in the module bytes of code end.
57 uint16_t local_int32_count; // number of int32 local variables.
58 uint16_t local_int64_count; // number of int64 local variables.
59 uint16_t local_float32_count; // number of float32 local variables.
60 uint16_t local_float64_count; // number of float64 local variables.
61 bool exported; // true if this function is exported.
62 bool external; // true if this function is externally supplied.
63 };
64
65 struct ModuleEnv; // forward declaration of decoder interface.
66
67 // Static representation of a wasm global variable.
68 struct WasmGlobal {
69 uint32_t name_offset; // offset in the module bytes of the name, if any.
70 MachineType type; // type of the global.
71 uint32_t offset; // offset from beginning of globals area.
72 bool exported; // true if this global is exported.
73 };
74
75 // Static representation of a wasm data segment.
76 struct WasmDataSegment {
77 uint32_t dest_addr; // destination memory address of the data.
78 uint32_t source_offset; // start offset in the module bytes.
79 uint32_t source_size; // end offset in the module bytes.
80 bool init; // true if loaded upon instantiation.
81 };
82
83 // Static representation of a module.
84 struct WasmModule {
85 static const uint8_t kMinMemSize = 12; // Minimum memory size = 4kb
86 static const uint8_t kMaxMemSize = 30; // Maximum memory size = 1gb
87
88 Isolate* shared_isolate; // isolate for storing shared code.
89 const byte* module_start; // starting address for the module bytes.
90 const byte* module_end; // end address for the module bytes.
91 uint8_t min_mem_size_log2; // minimum size of the memory (log base 2).
92 uint8_t max_mem_size_log2; // maximum size of the memory (log base 2).
93 bool mem_export; // true if the memory is exported.
94 bool mem_external; // true if the memory is external.
95
96 std::vector<WasmGlobal>* globals; // globals in this module.
97 std::vector<FunctionSig*>* signatures; // signatures in this module.
98 std::vector<WasmFunction>* functions; // functions in this module.
99 std::vector<WasmDataSegment>* data_segments; // data segments in this module.
100 std::vector<uint16_t>* function_table; // function table.
101
102 // Get a pointer to a string stored in the module bytes representing a name.
103 const char* GetName(uint32_t offset) {
104 CHECK(BoundsCheck(offset, offset + 1));
105 if (offset == 0) return "<?>"; // no name.
106 return reinterpret_cast<const char*>(module_start + offset);
107 }
108
109 // Checks the given offset range is contained within the module bytes.
110 bool BoundsCheck(uint32_t start, uint32_t end) {
111 size_t size = module_end - module_start;
112 return start < size && end < size;
113 }
114
115 // Creates a new instantiation of the module in the given isolate.
116 MaybeHandle<JSObject> Instantiate(Isolate* isolate, Handle<JSObject> ffi,
117 Handle<JSArrayBuffer> memory);
118 };
119
120 // forward declaration.
121 class WasmLinker;
122
123 // Interface provided to the decoder/graph builder which contains only
124 // minimal information about the globals, functions, and function tables.
125 struct ModuleEnv {
126 uintptr_t globals_area; // address of the globals area.
127 uintptr_t mem_start; // address of the start of linear memory.
128 uintptr_t mem_end; // address of the end of linear memory.
129
130 WasmModule* module;
131 WasmLinker* linker;
132 std::vector<Handle<Code>>* function_code;
133 Handle<FixedArray> function_table;
134 Handle<JSArrayBuffer> memory;
135 Handle<Context> context;
136 bool asm_js; // true if the module originated from asm.js.
137
138 bool IsValidGlobal(uint32_t index) {
139 return module && index < module->globals->size();
140 }
141 bool IsValidFunction(uint32_t index) {
142 return module && index < module->functions->size();
143 }
144 bool IsValidSignature(uint32_t index) {
145 return module && index < module->signatures->size();
146 }
147 MachineType GetGlobalType(uint32_t index) {
148 DCHECK(IsValidGlobal(index));
149 return module->globals->at(index).type;
150 }
151 FunctionSig* GetFunctionSignature(uint32_t index) {
152 DCHECK(IsValidFunction(index));
153 return module->functions->at(index).sig;
154 }
155 FunctionSig* GetSignature(uint32_t index) {
156 DCHECK(IsValidSignature(index));
157 return module->signatures->at(index);
158 }
159 size_t FunctionTableSize() {
160 return module ? module->function_table->size() : 0;
161 }
162
163 Handle<Code> GetFunctionCode(uint32_t index);
164 Handle<FixedArray> GetFunctionTable();
165
166 compiler::CallDescriptor* GetWasmCallDescriptor(Zone* zone, FunctionSig* sig);
167 compiler::CallDescriptor* GetCallDescriptor(Zone* zone, uint32_t index);
168 };
169
170 std::ostream& operator<<(std::ostream& os, const WasmModule& module);
171 std::ostream& operator<<(std::ostream& os, const WasmFunction& function);
172
173 typedef Result<WasmModule*> ModuleResult;
174 typedef Result<WasmFunction*> FunctionResult;
175
176 // For testing. Decode, verify, and run the last exported function in the
177 // given encoded module.
178 int32_t CompileAndRunWasmModule(Isolate* isolate, const byte* module_start,
179 const byte* module_end, bool asm_js = false);
180
181 // For testing. Decode, verify, and run the last exported function in the
182 // given decoded module.
183 int32_t CompileAndRunWasmModule(Isolate* isolate, WasmModule* module);
184 } // namespace wasm
185 } // namespace internal
186 } // namespace v8
187
188 #endif // V8_WASM_MODULE_H_
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