Ben Murdoch | 4a90d5f | 2016-03-22 12:00:34 +0000 | [diff] [blame] | 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 | #include "src/signature.h" |
| 6 | |
| 7 | #include "src/handles.h" |
| 8 | #include "src/v8.h" |
| 9 | #include "src/zone-containers.h" |
| 10 | |
| 11 | #include "src/wasm/ast-decoder.h" |
| 12 | #include "src/wasm/encoder.h" |
Ben Murdoch | da12d29 | 2016-06-02 14:46:10 +0100 | [diff] [blame^] | 13 | #include "src/wasm/wasm-macro-gen.h" |
Ben Murdoch | 4a90d5f | 2016-03-22 12:00:34 +0000 | [diff] [blame] | 14 | #include "src/wasm/wasm-module.h" |
| 15 | #include "src/wasm/wasm-opcodes.h" |
| 16 | |
| 17 | #include "src/v8memory.h" |
| 18 | |
Ben Murdoch | da12d29 | 2016-06-02 14:46:10 +0100 | [diff] [blame^] | 19 | #if DEBUG |
| 20 | #define TRACE(...) \ |
| 21 | do { \ |
| 22 | if (FLAG_trace_wasm_encoder) PrintF(__VA_ARGS__); \ |
| 23 | } while (false) |
| 24 | #else |
| 25 | #define TRACE(...) |
| 26 | #endif |
| 27 | |
Ben Murdoch | 4a90d5f | 2016-03-22 12:00:34 +0000 | [diff] [blame] | 28 | namespace v8 { |
| 29 | namespace internal { |
| 30 | namespace wasm { |
| 31 | |
| 32 | /*TODO: add error cases for adding too many locals, too many functions and bad |
| 33 | indices in body */ |
| 34 | |
| 35 | namespace { |
| 36 | void EmitUint8(byte** b, uint8_t x) { |
| 37 | Memory::uint8_at(*b) = x; |
| 38 | *b += 1; |
| 39 | } |
| 40 | |
| 41 | |
| 42 | void EmitUint16(byte** b, uint16_t x) { |
Ben Murdoch | 097c5b2 | 2016-05-18 11:27:45 +0100 | [diff] [blame] | 43 | WriteUnalignedUInt16(*b, x); |
Ben Murdoch | 4a90d5f | 2016-03-22 12:00:34 +0000 | [diff] [blame] | 44 | *b += 2; |
| 45 | } |
| 46 | |
| 47 | |
| 48 | void EmitUint32(byte** b, uint32_t x) { |
Ben Murdoch | 097c5b2 | 2016-05-18 11:27:45 +0100 | [diff] [blame] | 49 | WriteUnalignedUInt32(*b, x); |
Ben Murdoch | 4a90d5f | 2016-03-22 12:00:34 +0000 | [diff] [blame] | 50 | *b += 4; |
| 51 | } |
| 52 | |
Ben Murdoch | da12d29 | 2016-06-02 14:46:10 +0100 | [diff] [blame^] | 53 | // Sections all start with a size, but it's unknown at the start. |
| 54 | // We generate a large varint which we then fixup later when the size is known. |
| 55 | // |
| 56 | // TODO(jfb) Not strictly necessary since sizes are calculated ahead of time. |
| 57 | const size_t padded_varint = 5; |
Ben Murdoch | 4a90d5f | 2016-03-22 12:00:34 +0000 | [diff] [blame] | 58 | |
| 59 | void EmitVarInt(byte** b, size_t val) { |
| 60 | while (true) { |
| 61 | size_t next = val >> 7; |
| 62 | byte out = static_cast<byte>(val & 0x7f); |
| 63 | if (next) { |
| 64 | *((*b)++) = 0x80 | out; |
| 65 | val = next; |
| 66 | } else { |
| 67 | *((*b)++) = out; |
| 68 | break; |
| 69 | } |
| 70 | } |
| 71 | } |
Ben Murdoch | 4a90d5f | 2016-03-22 12:00:34 +0000 | [diff] [blame] | 72 | |
Ben Murdoch | da12d29 | 2016-06-02 14:46:10 +0100 | [diff] [blame^] | 73 | size_t SizeOfVarInt(size_t value) { |
| 74 | size_t size = 0; |
| 75 | do { |
| 76 | size++; |
| 77 | value = value >> 7; |
| 78 | } while (value > 0); |
| 79 | return size; |
| 80 | } |
| 81 | |
| 82 | void FixupSection(byte* start, byte* end) { |
| 83 | // Same as EmitVarInt, but fixed-width with zeroes in the MSBs. |
| 84 | size_t val = end - start - padded_varint; |
| 85 | TRACE(" fixup %u\n", (unsigned)val); |
| 86 | for (size_t pos = 0; pos != padded_varint; ++pos) { |
| 87 | size_t next = val >> 7; |
| 88 | byte out = static_cast<byte>(val & 0x7f); |
| 89 | if (pos != padded_varint - 1) { |
| 90 | *(start++) = 0x80 | out; |
| 91 | val = next; |
| 92 | } else { |
| 93 | *(start++) = out; |
| 94 | // TODO(jfb) check that the pre-allocated fixup size isn't overflowed. |
| 95 | } |
| 96 | } |
| 97 | } |
| 98 | |
| 99 | // Returns the start of the section, where the section VarInt size is. |
| 100 | byte* EmitSection(WasmSection::Code code, byte** b) { |
| 101 | byte* start = *b; |
| 102 | const char* name = WasmSection::getName(code); |
| 103 | size_t length = WasmSection::getNameLength(code); |
| 104 | TRACE("emit section: %s\n", name); |
| 105 | for (size_t padding = 0; padding != padded_varint; ++padding) { |
| 106 | EmitUint8(b, 0xff); // Will get fixed up later. |
| 107 | } |
| 108 | EmitVarInt(b, length); // Section name string size. |
| 109 | for (size_t i = 0; i != length; ++i) EmitUint8(b, name[i]); |
| 110 | return start; |
| 111 | } |
| 112 | } // namespace |
Ben Murdoch | 4a90d5f | 2016-03-22 12:00:34 +0000 | [diff] [blame] | 113 | |
| 114 | struct WasmFunctionBuilder::Type { |
| 115 | bool param_; |
| 116 | LocalType type_; |
| 117 | }; |
| 118 | |
| 119 | |
| 120 | WasmFunctionBuilder::WasmFunctionBuilder(Zone* zone) |
| 121 | : return_type_(kAstI32), |
| 122 | locals_(zone), |
| 123 | exported_(0), |
| 124 | external_(0), |
| 125 | body_(zone), |
| 126 | local_indices_(zone), |
| 127 | name_(zone) {} |
| 128 | |
| 129 | |
| 130 | uint16_t WasmFunctionBuilder::AddParam(LocalType type) { |
| 131 | return AddVar(type, true); |
| 132 | } |
| 133 | |
| 134 | |
| 135 | uint16_t WasmFunctionBuilder::AddLocal(LocalType type) { |
| 136 | return AddVar(type, false); |
| 137 | } |
| 138 | |
| 139 | |
| 140 | uint16_t WasmFunctionBuilder::AddVar(LocalType type, bool param) { |
| 141 | locals_.push_back({param, type}); |
| 142 | return static_cast<uint16_t>(locals_.size() - 1); |
| 143 | } |
| 144 | |
| 145 | |
| 146 | void WasmFunctionBuilder::ReturnType(LocalType type) { return_type_ = type; } |
| 147 | |
| 148 | |
| 149 | void WasmFunctionBuilder::EmitCode(const byte* code, uint32_t code_size) { |
| 150 | EmitCode(code, code_size, nullptr, 0); |
| 151 | } |
| 152 | |
| 153 | |
| 154 | void WasmFunctionBuilder::EmitCode(const byte* code, uint32_t code_size, |
| 155 | const uint32_t* local_indices, |
| 156 | uint32_t indices_size) { |
| 157 | size_t size = body_.size(); |
| 158 | for (size_t i = 0; i < code_size; i++) { |
| 159 | body_.push_back(code[i]); |
| 160 | } |
| 161 | for (size_t i = 0; i < indices_size; i++) { |
| 162 | local_indices_.push_back(local_indices[i] + static_cast<uint32_t>(size)); |
| 163 | } |
| 164 | } |
| 165 | |
| 166 | |
| 167 | void WasmFunctionBuilder::Emit(WasmOpcode opcode) { |
| 168 | body_.push_back(static_cast<byte>(opcode)); |
| 169 | } |
| 170 | |
| 171 | |
| 172 | void WasmFunctionBuilder::EmitWithU8(WasmOpcode opcode, const byte immediate) { |
| 173 | body_.push_back(static_cast<byte>(opcode)); |
| 174 | body_.push_back(immediate); |
| 175 | } |
| 176 | |
Ben Murdoch | da12d29 | 2016-06-02 14:46:10 +0100 | [diff] [blame^] | 177 | void WasmFunctionBuilder::EmitWithU8U8(WasmOpcode opcode, const byte imm1, |
| 178 | const byte imm2) { |
| 179 | body_.push_back(static_cast<byte>(opcode)); |
| 180 | body_.push_back(imm1); |
| 181 | body_.push_back(imm2); |
| 182 | } |
Ben Murdoch | 4a90d5f | 2016-03-22 12:00:34 +0000 | [diff] [blame] | 183 | |
Ben Murdoch | da12d29 | 2016-06-02 14:46:10 +0100 | [diff] [blame^] | 184 | void WasmFunctionBuilder::EmitWithVarInt(WasmOpcode opcode, |
| 185 | uint32_t immediate) { |
| 186 | body_.push_back(static_cast<byte>(opcode)); |
| 187 | size_t immediate_size = SizeOfVarInt(immediate); |
| 188 | body_.insert(body_.end(), immediate_size, 0); |
| 189 | byte* p = &body_[body_.size() - immediate_size]; |
| 190 | EmitVarInt(&p, immediate); |
| 191 | } |
| 192 | |
| 193 | uint32_t WasmFunctionBuilder::EmitEditableVarIntImmediate() { |
| 194 | // Guess that the immediate will be 1 byte. If it is more, we'll have to |
| 195 | // shift everything down. |
| 196 | body_.push_back(0); |
Ben Murdoch | 4a90d5f | 2016-03-22 12:00:34 +0000 | [diff] [blame] | 197 | return static_cast<uint32_t>(body_.size()) - 1; |
| 198 | } |
| 199 | |
Ben Murdoch | da12d29 | 2016-06-02 14:46:10 +0100 | [diff] [blame^] | 200 | void WasmFunctionBuilder::EditVarIntImmediate(uint32_t offset, |
| 201 | const uint32_t immediate) { |
| 202 | uint32_t immediate_size = static_cast<uint32_t>(SizeOfVarInt(immediate)); |
| 203 | // In EmitEditableVarIntImmediate, we guessed that we'd only need one byte. |
| 204 | // If we need more, shift everything down to make room for the larger |
| 205 | // immediate. |
| 206 | if (immediate_size > 1) { |
| 207 | uint32_t diff = immediate_size - 1; |
| 208 | body_.insert(body_.begin() + offset, diff, 0); |
Ben Murdoch | 4a90d5f | 2016-03-22 12:00:34 +0000 | [diff] [blame] | 209 | |
Ben Murdoch | da12d29 | 2016-06-02 14:46:10 +0100 | [diff] [blame^] | 210 | for (size_t i = 0; i < local_indices_.size(); ++i) { |
| 211 | if (local_indices_[i] >= offset) { |
| 212 | local_indices_[i] += diff; |
| 213 | } |
| 214 | } |
| 215 | } |
| 216 | DCHECK(offset + immediate_size <= body_.size()); |
| 217 | byte* p = &body_[offset]; |
| 218 | EmitVarInt(&p, immediate); |
Ben Murdoch | 4a90d5f | 2016-03-22 12:00:34 +0000 | [diff] [blame] | 219 | } |
| 220 | |
| 221 | |
| 222 | void WasmFunctionBuilder::Exported(uint8_t flag) { exported_ = flag; } |
| 223 | |
| 224 | |
| 225 | void WasmFunctionBuilder::External(uint8_t flag) { external_ = flag; } |
| 226 | |
| 227 | void WasmFunctionBuilder::SetName(const unsigned char* name, int name_length) { |
| 228 | name_.clear(); |
| 229 | if (name_length > 0) { |
| 230 | for (int i = 0; i < name_length; i++) { |
| 231 | name_.push_back(*(name + i)); |
| 232 | } |
Ben Murdoch | 4a90d5f | 2016-03-22 12:00:34 +0000 | [diff] [blame] | 233 | } |
| 234 | } |
| 235 | |
| 236 | |
| 237 | WasmFunctionEncoder* WasmFunctionBuilder::Build(Zone* zone, |
| 238 | WasmModuleBuilder* mb) const { |
| 239 | WasmFunctionEncoder* e = |
| 240 | new (zone) WasmFunctionEncoder(zone, return_type_, exported_, external_); |
| 241 | uint16_t* var_index = zone->NewArray<uint16_t>(locals_.size()); |
| 242 | IndexVars(e, var_index); |
| 243 | if (body_.size() > 0) { |
| 244 | // TODO(titzer): iterate over local indexes, not the bytes. |
| 245 | const byte* start = &body_[0]; |
| 246 | const byte* end = start + body_.size(); |
| 247 | size_t local_index = 0; |
| 248 | for (size_t i = 0; i < body_.size();) { |
| 249 | if (local_index < local_indices_.size() && |
| 250 | i == local_indices_[local_index]) { |
| 251 | int length = 0; |
| 252 | uint32_t index; |
| 253 | ReadUnsignedLEB128Operand(start + i, end, &length, &index); |
| 254 | uint16_t new_index = var_index[index]; |
| 255 | const std::vector<uint8_t>& index_vec = UnsignedLEB128From(new_index); |
| 256 | for (size_t j = 0; j < index_vec.size(); j++) { |
| 257 | e->body_.push_back(index_vec.at(j)); |
| 258 | } |
| 259 | i += length; |
| 260 | local_index++; |
| 261 | } else { |
| 262 | e->body_.push_back(*(start + i)); |
| 263 | i++; |
| 264 | } |
| 265 | } |
| 266 | } |
| 267 | FunctionSig::Builder sig(zone, return_type_ == kAstStmt ? 0 : 1, |
| 268 | e->params_.size()); |
| 269 | if (return_type_ != kAstStmt) { |
| 270 | sig.AddReturn(static_cast<LocalType>(return_type_)); |
| 271 | } |
| 272 | for (size_t i = 0; i < e->params_.size(); i++) { |
| 273 | sig.AddParam(static_cast<LocalType>(e->params_[i])); |
| 274 | } |
| 275 | e->signature_index_ = mb->AddSignature(sig.Build()); |
| 276 | e->name_.insert(e->name_.begin(), name_.begin(), name_.end()); |
| 277 | return e; |
| 278 | } |
| 279 | |
| 280 | |
| 281 | void WasmFunctionBuilder::IndexVars(WasmFunctionEncoder* e, |
| 282 | uint16_t* var_index) const { |
| 283 | uint16_t param = 0; |
Ben Murdoch | 097c5b2 | 2016-05-18 11:27:45 +0100 | [diff] [blame] | 284 | uint16_t i32 = 0; |
| 285 | uint16_t i64 = 0; |
| 286 | uint16_t f32 = 0; |
| 287 | uint16_t f64 = 0; |
Ben Murdoch | 4a90d5f | 2016-03-22 12:00:34 +0000 | [diff] [blame] | 288 | for (size_t i = 0; i < locals_.size(); i++) { |
| 289 | if (locals_.at(i).param_) { |
| 290 | param++; |
| 291 | } else if (locals_.at(i).type_ == kAstI32) { |
Ben Murdoch | 097c5b2 | 2016-05-18 11:27:45 +0100 | [diff] [blame] | 292 | i32++; |
Ben Murdoch | 4a90d5f | 2016-03-22 12:00:34 +0000 | [diff] [blame] | 293 | } else if (locals_.at(i).type_ == kAstI64) { |
Ben Murdoch | 097c5b2 | 2016-05-18 11:27:45 +0100 | [diff] [blame] | 294 | i64++; |
Ben Murdoch | 4a90d5f | 2016-03-22 12:00:34 +0000 | [diff] [blame] | 295 | } else if (locals_.at(i).type_ == kAstF32) { |
Ben Murdoch | 097c5b2 | 2016-05-18 11:27:45 +0100 | [diff] [blame] | 296 | f32++; |
Ben Murdoch | 4a90d5f | 2016-03-22 12:00:34 +0000 | [diff] [blame] | 297 | } else if (locals_.at(i).type_ == kAstF64) { |
Ben Murdoch | 097c5b2 | 2016-05-18 11:27:45 +0100 | [diff] [blame] | 298 | f64++; |
Ben Murdoch | 4a90d5f | 2016-03-22 12:00:34 +0000 | [diff] [blame] | 299 | } |
| 300 | } |
Ben Murdoch | 097c5b2 | 2016-05-18 11:27:45 +0100 | [diff] [blame] | 301 | e->local_i32_count_ = i32; |
| 302 | e->local_i64_count_ = i64; |
| 303 | e->local_f32_count_ = f32; |
| 304 | e->local_f64_count_ = f64; |
| 305 | f64 = param + i32 + i64 + f32; |
| 306 | f32 = param + i32 + i64; |
| 307 | i64 = param + i32; |
| 308 | i32 = param; |
Ben Murdoch | 4a90d5f | 2016-03-22 12:00:34 +0000 | [diff] [blame] | 309 | param = 0; |
| 310 | for (size_t i = 0; i < locals_.size(); i++) { |
| 311 | if (locals_.at(i).param_) { |
| 312 | e->params_.push_back(locals_.at(i).type_); |
| 313 | var_index[i] = param++; |
| 314 | } else if (locals_.at(i).type_ == kAstI32) { |
Ben Murdoch | 097c5b2 | 2016-05-18 11:27:45 +0100 | [diff] [blame] | 315 | var_index[i] = i32++; |
Ben Murdoch | 4a90d5f | 2016-03-22 12:00:34 +0000 | [diff] [blame] | 316 | } else if (locals_.at(i).type_ == kAstI64) { |
Ben Murdoch | 097c5b2 | 2016-05-18 11:27:45 +0100 | [diff] [blame] | 317 | var_index[i] = i64++; |
Ben Murdoch | 4a90d5f | 2016-03-22 12:00:34 +0000 | [diff] [blame] | 318 | } else if (locals_.at(i).type_ == kAstF32) { |
Ben Murdoch | 097c5b2 | 2016-05-18 11:27:45 +0100 | [diff] [blame] | 319 | var_index[i] = f32++; |
Ben Murdoch | 4a90d5f | 2016-03-22 12:00:34 +0000 | [diff] [blame] | 320 | } else if (locals_.at(i).type_ == kAstF64) { |
Ben Murdoch | 097c5b2 | 2016-05-18 11:27:45 +0100 | [diff] [blame] | 321 | var_index[i] = f64++; |
Ben Murdoch | 4a90d5f | 2016-03-22 12:00:34 +0000 | [diff] [blame] | 322 | } |
| 323 | } |
| 324 | } |
| 325 | |
| 326 | |
| 327 | WasmFunctionEncoder::WasmFunctionEncoder(Zone* zone, LocalType return_type, |
| 328 | bool exported, bool external) |
| 329 | : params_(zone), |
| 330 | exported_(exported), |
| 331 | external_(external), |
| 332 | body_(zone), |
| 333 | name_(zone) {} |
| 334 | |
| 335 | |
| 336 | uint32_t WasmFunctionEncoder::HeaderSize() const { |
| 337 | uint32_t size = 3; |
Ben Murdoch | 4a90d5f | 2016-03-22 12:00:34 +0000 | [diff] [blame] | 338 | if (!external_) size += 2; |
Ben Murdoch | da12d29 | 2016-06-02 14:46:10 +0100 | [diff] [blame^] | 339 | if (HasName()) { |
| 340 | uint32_t name_size = NameSize(); |
| 341 | size += static_cast<uint32_t>(SizeOfVarInt(name_size)) + name_size; |
| 342 | } |
Ben Murdoch | 4a90d5f | 2016-03-22 12:00:34 +0000 | [diff] [blame] | 343 | return size; |
| 344 | } |
| 345 | |
| 346 | |
| 347 | uint32_t WasmFunctionEncoder::BodySize(void) const { |
Ben Murdoch | da12d29 | 2016-06-02 14:46:10 +0100 | [diff] [blame^] | 348 | // TODO(titzer): embed a LocalDeclEncoder in the WasmFunctionEncoder |
| 349 | LocalDeclEncoder local_decl; |
| 350 | local_decl.AddLocals(local_i32_count_, kAstI32); |
| 351 | local_decl.AddLocals(local_i64_count_, kAstI64); |
| 352 | local_decl.AddLocals(local_f32_count_, kAstF32); |
| 353 | local_decl.AddLocals(local_f64_count_, kAstF64); |
| 354 | |
| 355 | return external_ ? 0 |
| 356 | : static_cast<uint32_t>(body_.size() + local_decl.Size()); |
Ben Murdoch | 4a90d5f | 2016-03-22 12:00:34 +0000 | [diff] [blame] | 357 | } |
| 358 | |
| 359 | |
| 360 | uint32_t WasmFunctionEncoder::NameSize() const { |
Ben Murdoch | 097c5b2 | 2016-05-18 11:27:45 +0100 | [diff] [blame] | 361 | return HasName() ? static_cast<uint32_t>(name_.size()) : 0; |
Ben Murdoch | 4a90d5f | 2016-03-22 12:00:34 +0000 | [diff] [blame] | 362 | } |
| 363 | |
| 364 | |
| 365 | void WasmFunctionEncoder::Serialize(byte* buffer, byte** header, |
| 366 | byte** body) const { |
| 367 | uint8_t decl_bits = (exported_ ? kDeclFunctionExport : 0) | |
| 368 | (external_ ? kDeclFunctionImport : 0) | |
Ben Murdoch | 4a90d5f | 2016-03-22 12:00:34 +0000 | [diff] [blame] | 369 | (HasName() ? kDeclFunctionName : 0); |
| 370 | |
| 371 | EmitUint8(header, decl_bits); |
| 372 | EmitUint16(header, signature_index_); |
| 373 | |
| 374 | if (HasName()) { |
Ben Murdoch | da12d29 | 2016-06-02 14:46:10 +0100 | [diff] [blame^] | 375 | EmitVarInt(header, NameSize()); |
| 376 | for (size_t i = 0; i < name_.size(); ++i) { |
| 377 | EmitUint8(header, name_[i]); |
| 378 | } |
Ben Murdoch | 4a90d5f | 2016-03-22 12:00:34 +0000 | [diff] [blame] | 379 | } |
| 380 | |
Ben Murdoch | 4a90d5f | 2016-03-22 12:00:34 +0000 | [diff] [blame] | 381 | |
| 382 | if (!external_) { |
Ben Murdoch | da12d29 | 2016-06-02 14:46:10 +0100 | [diff] [blame^] | 383 | // TODO(titzer): embed a LocalDeclEncoder in the WasmFunctionEncoder |
| 384 | LocalDeclEncoder local_decl; |
| 385 | local_decl.AddLocals(local_i32_count_, kAstI32); |
| 386 | local_decl.AddLocals(local_i64_count_, kAstI64); |
| 387 | local_decl.AddLocals(local_f32_count_, kAstF32); |
| 388 | local_decl.AddLocals(local_f64_count_, kAstF64); |
| 389 | |
| 390 | EmitUint16(header, static_cast<uint16_t>(body_.size() + local_decl.Size())); |
| 391 | (*header) += local_decl.Emit(*header); |
Ben Murdoch | 4a90d5f | 2016-03-22 12:00:34 +0000 | [diff] [blame] | 392 | if (body_.size() > 0) { |
| 393 | std::memcpy(*header, &body_[0], body_.size()); |
| 394 | (*header) += body_.size(); |
| 395 | } |
| 396 | } |
| 397 | } |
| 398 | |
| 399 | |
| 400 | WasmDataSegmentEncoder::WasmDataSegmentEncoder(Zone* zone, const byte* data, |
| 401 | uint32_t size, uint32_t dest) |
| 402 | : data_(zone), dest_(dest) { |
| 403 | for (size_t i = 0; i < size; i++) { |
| 404 | data_.push_back(data[i]); |
| 405 | } |
| 406 | } |
| 407 | |
| 408 | |
| 409 | uint32_t WasmDataSegmentEncoder::HeaderSize() const { |
| 410 | static const int kDataSegmentSize = 13; |
| 411 | return kDataSegmentSize; |
| 412 | } |
| 413 | |
| 414 | |
| 415 | uint32_t WasmDataSegmentEncoder::BodySize() const { |
| 416 | return static_cast<uint32_t>(data_.size()); |
| 417 | } |
| 418 | |
| 419 | |
| 420 | void WasmDataSegmentEncoder::Serialize(byte* buffer, byte** header, |
| 421 | byte** body) const { |
Ben Murdoch | da12d29 | 2016-06-02 14:46:10 +0100 | [diff] [blame^] | 422 | EmitVarInt(header, dest_); |
| 423 | EmitVarInt(header, static_cast<uint32_t>(data_.size())); |
Ben Murdoch | 4a90d5f | 2016-03-22 12:00:34 +0000 | [diff] [blame] | 424 | |
Ben Murdoch | da12d29 | 2016-06-02 14:46:10 +0100 | [diff] [blame^] | 425 | std::memcpy(*header, &data_[0], data_.size()); |
| 426 | (*header) += data_.size(); |
Ben Murdoch | 4a90d5f | 2016-03-22 12:00:34 +0000 | [diff] [blame] | 427 | } |
| 428 | |
Ben Murdoch | 4a90d5f | 2016-03-22 12:00:34 +0000 | [diff] [blame] | 429 | WasmModuleBuilder::WasmModuleBuilder(Zone* zone) |
| 430 | : zone_(zone), |
| 431 | signatures_(zone), |
| 432 | functions_(zone), |
| 433 | data_segments_(zone), |
| 434 | indirect_functions_(zone), |
| 435 | globals_(zone), |
Ben Murdoch | da12d29 | 2016-06-02 14:46:10 +0100 | [diff] [blame^] | 436 | signature_map_(zone), |
| 437 | start_function_index_(-1) {} |
Ben Murdoch | 4a90d5f | 2016-03-22 12:00:34 +0000 | [diff] [blame] | 438 | |
| 439 | uint16_t WasmModuleBuilder::AddFunction() { |
| 440 | functions_.push_back(new (zone_) WasmFunctionBuilder(zone_)); |
| 441 | return static_cast<uint16_t>(functions_.size() - 1); |
| 442 | } |
| 443 | |
| 444 | |
| 445 | WasmFunctionBuilder* WasmModuleBuilder::FunctionAt(size_t index) { |
| 446 | if (functions_.size() > index) { |
| 447 | return functions_.at(index); |
| 448 | } else { |
| 449 | return nullptr; |
| 450 | } |
| 451 | } |
| 452 | |
| 453 | |
| 454 | void WasmModuleBuilder::AddDataSegment(WasmDataSegmentEncoder* data) { |
| 455 | data_segments_.push_back(data); |
| 456 | } |
| 457 | |
| 458 | |
Ben Murdoch | 097c5b2 | 2016-05-18 11:27:45 +0100 | [diff] [blame] | 459 | bool WasmModuleBuilder::CompareFunctionSigs::operator()(FunctionSig* a, |
| 460 | FunctionSig* b) const { |
| 461 | if (a->return_count() < b->return_count()) return true; |
| 462 | if (a->return_count() > b->return_count()) return false; |
| 463 | if (a->parameter_count() < b->parameter_count()) return true; |
| 464 | if (a->parameter_count() > b->parameter_count()) return false; |
Ben Murdoch | 4a90d5f | 2016-03-22 12:00:34 +0000 | [diff] [blame] | 465 | for (size_t r = 0; r < a->return_count(); r++) { |
Ben Murdoch | 097c5b2 | 2016-05-18 11:27:45 +0100 | [diff] [blame] | 466 | if (a->GetReturn(r) < b->GetReturn(r)) return true; |
| 467 | if (a->GetReturn(r) > b->GetReturn(r)) return false; |
Ben Murdoch | 4a90d5f | 2016-03-22 12:00:34 +0000 | [diff] [blame] | 468 | } |
| 469 | for (size_t p = 0; p < a->parameter_count(); p++) { |
Ben Murdoch | 097c5b2 | 2016-05-18 11:27:45 +0100 | [diff] [blame] | 470 | if (a->GetParam(p) < b->GetParam(p)) return true; |
| 471 | if (a->GetParam(p) > b->GetParam(p)) return false; |
Ben Murdoch | 4a90d5f | 2016-03-22 12:00:34 +0000 | [diff] [blame] | 472 | } |
Ben Murdoch | 097c5b2 | 2016-05-18 11:27:45 +0100 | [diff] [blame] | 473 | return false; |
Ben Murdoch | 4a90d5f | 2016-03-22 12:00:34 +0000 | [diff] [blame] | 474 | } |
| 475 | |
| 476 | |
| 477 | uint16_t WasmModuleBuilder::AddSignature(FunctionSig* sig) { |
| 478 | SignatureMap::iterator pos = signature_map_.find(sig); |
| 479 | if (pos != signature_map_.end()) { |
| 480 | return pos->second; |
| 481 | } else { |
| 482 | uint16_t index = static_cast<uint16_t>(signatures_.size()); |
| 483 | signature_map_[sig] = index; |
| 484 | signatures_.push_back(sig); |
| 485 | return index; |
| 486 | } |
| 487 | } |
| 488 | |
| 489 | |
| 490 | void WasmModuleBuilder::AddIndirectFunction(uint16_t index) { |
| 491 | indirect_functions_.push_back(index); |
| 492 | } |
| 493 | |
Ben Murdoch | da12d29 | 2016-06-02 14:46:10 +0100 | [diff] [blame^] | 494 | void WasmModuleBuilder::MarkStartFunction(uint16_t index) { |
| 495 | start_function_index_ = index; |
| 496 | } |
Ben Murdoch | 4a90d5f | 2016-03-22 12:00:34 +0000 | [diff] [blame] | 497 | |
| 498 | WasmModuleWriter* WasmModuleBuilder::Build(Zone* zone) { |
| 499 | WasmModuleWriter* writer = new (zone) WasmModuleWriter(zone); |
| 500 | for (auto function : functions_) { |
| 501 | writer->functions_.push_back(function->Build(zone, this)); |
| 502 | } |
| 503 | for (auto segment : data_segments_) { |
| 504 | writer->data_segments_.push_back(segment); |
| 505 | } |
| 506 | for (auto sig : signatures_) { |
| 507 | writer->signatures_.push_back(sig); |
| 508 | } |
| 509 | for (auto index : indirect_functions_) { |
| 510 | writer->indirect_functions_.push_back(index); |
| 511 | } |
| 512 | for (auto global : globals_) { |
| 513 | writer->globals_.push_back(global); |
| 514 | } |
Ben Murdoch | da12d29 | 2016-06-02 14:46:10 +0100 | [diff] [blame^] | 515 | writer->start_function_index_ = start_function_index_; |
Ben Murdoch | 4a90d5f | 2016-03-22 12:00:34 +0000 | [diff] [blame] | 516 | return writer; |
| 517 | } |
| 518 | |
| 519 | |
| 520 | uint32_t WasmModuleBuilder::AddGlobal(MachineType type, bool exported) { |
| 521 | globals_.push_back(std::make_pair(type, exported)); |
| 522 | return static_cast<uint32_t>(globals_.size() - 1); |
| 523 | } |
| 524 | |
| 525 | |
| 526 | WasmModuleWriter::WasmModuleWriter(Zone* zone) |
| 527 | : functions_(zone), |
| 528 | data_segments_(zone), |
| 529 | signatures_(zone), |
| 530 | indirect_functions_(zone), |
| 531 | globals_(zone) {} |
| 532 | |
Ben Murdoch | 4a90d5f | 2016-03-22 12:00:34 +0000 | [diff] [blame] | 533 | struct Sizes { |
| 534 | size_t header_size; |
| 535 | size_t body_size; |
| 536 | |
| 537 | size_t total() { return header_size + body_size; } |
| 538 | |
| 539 | void Add(size_t header, size_t body) { |
| 540 | header_size += header; |
| 541 | body_size += body; |
| 542 | } |
| 543 | |
Ben Murdoch | da12d29 | 2016-06-02 14:46:10 +0100 | [diff] [blame^] | 544 | void AddSection(WasmSection::Code code, size_t other_size) { |
| 545 | Add(padded_varint + SizeOfVarInt(WasmSection::getNameLength(code)) + |
| 546 | WasmSection::getNameLength(code), |
| 547 | 0); |
| 548 | if (other_size) Add(SizeOfVarInt(other_size), 0); |
Ben Murdoch | 4a90d5f | 2016-03-22 12:00:34 +0000 | [diff] [blame] | 549 | } |
| 550 | }; |
| 551 | |
Ben Murdoch | 4a90d5f | 2016-03-22 12:00:34 +0000 | [diff] [blame] | 552 | WasmModuleIndex* WasmModuleWriter::WriteTo(Zone* zone) const { |
| 553 | Sizes sizes = {0, 0}; |
| 554 | |
Ben Murdoch | da12d29 | 2016-06-02 14:46:10 +0100 | [diff] [blame^] | 555 | sizes.Add(2 * sizeof(uint32_t), 0); // header |
| 556 | |
| 557 | sizes.AddSection(WasmSection::Code::Memory, 0); |
Ben Murdoch | 4a90d5f | 2016-03-22 12:00:34 +0000 | [diff] [blame] | 558 | sizes.Add(kDeclMemorySize, 0); |
Ben Murdoch | da12d29 | 2016-06-02 14:46:10 +0100 | [diff] [blame^] | 559 | TRACE("Size after memory: %u, %u\n", (unsigned)sizes.header_size, |
| 560 | (unsigned)sizes.body_size); |
Ben Murdoch | 4a90d5f | 2016-03-22 12:00:34 +0000 | [diff] [blame] | 561 | |
Ben Murdoch | 4a90d5f | 2016-03-22 12:00:34 +0000 | [diff] [blame] | 562 | if (globals_.size() > 0) { |
Ben Murdoch | da12d29 | 2016-06-02 14:46:10 +0100 | [diff] [blame^] | 563 | sizes.AddSection(WasmSection::Code::Globals, globals_.size()); |
| 564 | /* These globals never have names, so are always 3 bytes. */ |
| 565 | sizes.Add(3 * globals_.size(), 0); |
| 566 | TRACE("Size after globals: %u, %u\n", (unsigned)sizes.header_size, |
| 567 | (unsigned)sizes.body_size); |
Ben Murdoch | 4a90d5f | 2016-03-22 12:00:34 +0000 | [diff] [blame] | 568 | } |
| 569 | |
Ben Murdoch | da12d29 | 2016-06-02 14:46:10 +0100 | [diff] [blame^] | 570 | if (signatures_.size() > 0) { |
| 571 | sizes.AddSection(WasmSection::Code::Signatures, signatures_.size()); |
| 572 | for (auto sig : signatures_) { |
| 573 | sizes.Add( |
| 574 | 1 + SizeOfVarInt(sig->parameter_count()) + sig->parameter_count(), 0); |
| 575 | } |
| 576 | TRACE("Size after signatures: %u, %u\n", (unsigned)sizes.header_size, |
| 577 | (unsigned)sizes.body_size); |
Ben Murdoch | 4a90d5f | 2016-03-22 12:00:34 +0000 | [diff] [blame] | 578 | } |
| 579 | |
Ben Murdoch | da12d29 | 2016-06-02 14:46:10 +0100 | [diff] [blame^] | 580 | if (functions_.size() > 0) { |
| 581 | sizes.AddSection(WasmSection::Code::Functions, functions_.size()); |
| 582 | for (auto function : functions_) { |
| 583 | sizes.Add(function->HeaderSize() + function->BodySize(), |
| 584 | function->NameSize()); |
| 585 | } |
| 586 | TRACE("Size after functions: %u, %u\n", (unsigned)sizes.header_size, |
| 587 | (unsigned)sizes.body_size); |
Ben Murdoch | 4a90d5f | 2016-03-22 12:00:34 +0000 | [diff] [blame] | 588 | } |
| 589 | |
Ben Murdoch | da12d29 | 2016-06-02 14:46:10 +0100 | [diff] [blame^] | 590 | if (start_function_index_ >= 0) { |
| 591 | sizes.AddSection(WasmSection::Code::StartFunction, 0); |
| 592 | sizes.Add(SizeOfVarInt(start_function_index_), 0); |
| 593 | TRACE("Size after start: %u, %u\n", (unsigned)sizes.header_size, |
| 594 | (unsigned)sizes.body_size); |
| 595 | } |
Ben Murdoch | 4a90d5f | 2016-03-22 12:00:34 +0000 | [diff] [blame] | 596 | |
Ben Murdoch | da12d29 | 2016-06-02 14:46:10 +0100 | [diff] [blame^] | 597 | if (data_segments_.size() > 0) { |
| 598 | sizes.AddSection(WasmSection::Code::DataSegments, data_segments_.size()); |
| 599 | for (auto segment : data_segments_) { |
| 600 | sizes.Add(segment->HeaderSize(), segment->BodySize()); |
| 601 | } |
| 602 | TRACE("Size after data segments: %u, %u\n", (unsigned)sizes.header_size, |
| 603 | (unsigned)sizes.body_size); |
| 604 | } |
| 605 | |
| 606 | if (indirect_functions_.size() > 0) { |
| 607 | sizes.AddSection(WasmSection::Code::FunctionTable, |
| 608 | indirect_functions_.size()); |
| 609 | for (auto function_index : indirect_functions_) { |
| 610 | sizes.Add(SizeOfVarInt(function_index), 0); |
| 611 | } |
| 612 | TRACE("Size after indirect functions: %u, %u\n", |
| 613 | (unsigned)sizes.header_size, (unsigned)sizes.body_size); |
| 614 | } |
| 615 | |
| 616 | if (sizes.body_size > 0) { |
| 617 | sizes.AddSection(WasmSection::Code::End, 0); |
| 618 | TRACE("Size after end: %u, %u\n", (unsigned)sizes.header_size, |
| 619 | (unsigned)sizes.body_size); |
| 620 | } |
Ben Murdoch | 4a90d5f | 2016-03-22 12:00:34 +0000 | [diff] [blame] | 621 | |
| 622 | ZoneVector<uint8_t> buffer_vector(sizes.total(), zone); |
| 623 | byte* buffer = &buffer_vector[0]; |
| 624 | byte* header = buffer; |
| 625 | byte* body = buffer + sizes.header_size; |
| 626 | |
Ben Murdoch | da12d29 | 2016-06-02 14:46:10 +0100 | [diff] [blame^] | 627 | // -- emit magic ------------------------------------------------------------- |
| 628 | TRACE("emit magic\n"); |
| 629 | EmitUint32(&header, kWasmMagic); |
| 630 | EmitUint32(&header, kWasmVersion); |
| 631 | |
Ben Murdoch | 4a90d5f | 2016-03-22 12:00:34 +0000 | [diff] [blame] | 632 | // -- emit memory declaration ------------------------------------------------ |
Ben Murdoch | da12d29 | 2016-06-02 14:46:10 +0100 | [diff] [blame^] | 633 | { |
| 634 | byte* section = EmitSection(WasmSection::Code::Memory, &header); |
| 635 | EmitVarInt(&header, 16); // min memory size |
| 636 | EmitVarInt(&header, 16); // max memory size |
| 637 | EmitUint8(&header, 0); // memory export |
| 638 | static_assert(kDeclMemorySize == 3, "memory size must match emit above"); |
| 639 | FixupSection(section, header); |
| 640 | } |
Ben Murdoch | 4a90d5f | 2016-03-22 12:00:34 +0000 | [diff] [blame] | 641 | |
| 642 | // -- emit globals ----------------------------------------------------------- |
| 643 | if (globals_.size() > 0) { |
Ben Murdoch | da12d29 | 2016-06-02 14:46:10 +0100 | [diff] [blame^] | 644 | byte* section = EmitSection(WasmSection::Code::Globals, &header); |
Ben Murdoch | 4a90d5f | 2016-03-22 12:00:34 +0000 | [diff] [blame] | 645 | EmitVarInt(&header, globals_.size()); |
| 646 | |
| 647 | for (auto global : globals_) { |
Ben Murdoch | da12d29 | 2016-06-02 14:46:10 +0100 | [diff] [blame^] | 648 | EmitVarInt(&header, 0); // Length of the global name. |
Ben Murdoch | 4a90d5f | 2016-03-22 12:00:34 +0000 | [diff] [blame] | 649 | EmitUint8(&header, WasmOpcodes::MemTypeCodeFor(global.first)); |
| 650 | EmitUint8(&header, global.second); |
| 651 | } |
Ben Murdoch | da12d29 | 2016-06-02 14:46:10 +0100 | [diff] [blame^] | 652 | FixupSection(section, header); |
Ben Murdoch | 4a90d5f | 2016-03-22 12:00:34 +0000 | [diff] [blame] | 653 | } |
| 654 | |
| 655 | // -- emit signatures -------------------------------------------------------- |
| 656 | if (signatures_.size() > 0) { |
Ben Murdoch | da12d29 | 2016-06-02 14:46:10 +0100 | [diff] [blame^] | 657 | byte* section = EmitSection(WasmSection::Code::Signatures, &header); |
Ben Murdoch | 4a90d5f | 2016-03-22 12:00:34 +0000 | [diff] [blame] | 658 | EmitVarInt(&header, signatures_.size()); |
| 659 | |
| 660 | for (FunctionSig* sig : signatures_) { |
Ben Murdoch | da12d29 | 2016-06-02 14:46:10 +0100 | [diff] [blame^] | 661 | EmitVarInt(&header, sig->parameter_count()); |
Ben Murdoch | 4a90d5f | 2016-03-22 12:00:34 +0000 | [diff] [blame] | 662 | if (sig->return_count() > 0) { |
| 663 | EmitUint8(&header, WasmOpcodes::LocalTypeCodeFor(sig->GetReturn())); |
| 664 | } else { |
| 665 | EmitUint8(&header, kLocalVoid); |
| 666 | } |
| 667 | for (size_t j = 0; j < sig->parameter_count(); j++) { |
| 668 | EmitUint8(&header, WasmOpcodes::LocalTypeCodeFor(sig->GetParam(j))); |
| 669 | } |
| 670 | } |
Ben Murdoch | da12d29 | 2016-06-02 14:46:10 +0100 | [diff] [blame^] | 671 | FixupSection(section, header); |
Ben Murdoch | 4a90d5f | 2016-03-22 12:00:34 +0000 | [diff] [blame] | 672 | } |
| 673 | |
| 674 | // -- emit functions --------------------------------------------------------- |
| 675 | if (functions_.size() > 0) { |
Ben Murdoch | da12d29 | 2016-06-02 14:46:10 +0100 | [diff] [blame^] | 676 | byte* section = EmitSection(WasmSection::Code::Functions, &header); |
Ben Murdoch | 4a90d5f | 2016-03-22 12:00:34 +0000 | [diff] [blame] | 677 | EmitVarInt(&header, functions_.size()); |
| 678 | |
| 679 | for (auto func : functions_) { |
| 680 | func->Serialize(buffer, &header, &body); |
| 681 | } |
Ben Murdoch | da12d29 | 2016-06-02 14:46:10 +0100 | [diff] [blame^] | 682 | FixupSection(section, header); |
| 683 | } |
| 684 | |
| 685 | // -- emit start function index ---------------------------------------------- |
| 686 | if (start_function_index_ >= 0) { |
| 687 | byte* section = EmitSection(WasmSection::Code::StartFunction, &header); |
| 688 | EmitVarInt(&header, start_function_index_); |
| 689 | FixupSection(section, header); |
Ben Murdoch | 4a90d5f | 2016-03-22 12:00:34 +0000 | [diff] [blame] | 690 | } |
| 691 | |
| 692 | // -- emit data segments ----------------------------------------------------- |
| 693 | if (data_segments_.size() > 0) { |
Ben Murdoch | da12d29 | 2016-06-02 14:46:10 +0100 | [diff] [blame^] | 694 | byte* section = EmitSection(WasmSection::Code::DataSegments, &header); |
Ben Murdoch | 4a90d5f | 2016-03-22 12:00:34 +0000 | [diff] [blame] | 695 | EmitVarInt(&header, data_segments_.size()); |
| 696 | |
| 697 | for (auto segment : data_segments_) { |
| 698 | segment->Serialize(buffer, &header, &body); |
| 699 | } |
Ben Murdoch | da12d29 | 2016-06-02 14:46:10 +0100 | [diff] [blame^] | 700 | FixupSection(section, header); |
Ben Murdoch | 4a90d5f | 2016-03-22 12:00:34 +0000 | [diff] [blame] | 701 | } |
| 702 | |
| 703 | // -- emit function table ---------------------------------------------------- |
| 704 | if (indirect_functions_.size() > 0) { |
Ben Murdoch | da12d29 | 2016-06-02 14:46:10 +0100 | [diff] [blame^] | 705 | byte* section = EmitSection(WasmSection::Code::FunctionTable, &header); |
Ben Murdoch | 4a90d5f | 2016-03-22 12:00:34 +0000 | [diff] [blame] | 706 | EmitVarInt(&header, indirect_functions_.size()); |
| 707 | |
| 708 | for (auto index : indirect_functions_) { |
Ben Murdoch | da12d29 | 2016-06-02 14:46:10 +0100 | [diff] [blame^] | 709 | EmitVarInt(&header, index); |
Ben Murdoch | 4a90d5f | 2016-03-22 12:00:34 +0000 | [diff] [blame] | 710 | } |
Ben Murdoch | da12d29 | 2016-06-02 14:46:10 +0100 | [diff] [blame^] | 711 | FixupSection(section, header); |
Ben Murdoch | 4a90d5f | 2016-03-22 12:00:34 +0000 | [diff] [blame] | 712 | } |
| 713 | |
Ben Murdoch | da12d29 | 2016-06-02 14:46:10 +0100 | [diff] [blame^] | 714 | if (sizes.body_size > 0) { |
| 715 | byte* section = EmitSection(WasmSection::Code::End, &header); |
| 716 | FixupSection(section, header); |
| 717 | } |
Ben Murdoch | 4a90d5f | 2016-03-22 12:00:34 +0000 | [diff] [blame] | 718 | |
| 719 | return new (zone) WasmModuleIndex(buffer, buffer + sizes.total()); |
| 720 | } |
| 721 | |
| 722 | |
| 723 | std::vector<uint8_t> UnsignedLEB128From(uint32_t result) { |
| 724 | std::vector<uint8_t> output; |
| 725 | uint8_t next = 0; |
| 726 | int shift = 0; |
| 727 | do { |
| 728 | next = static_cast<uint8_t>(result >> shift); |
| 729 | if (((result >> shift) & 0xFFFFFF80) != 0) { |
| 730 | next = next | 0x80; |
| 731 | } |
| 732 | output.push_back(next); |
| 733 | shift += 7; |
| 734 | } while ((next & 0x80) != 0); |
| 735 | return output; |
| 736 | } |
| 737 | } // namespace wasm |
| 738 | } // namespace internal |
| 739 | } // namespace v8 |