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| 1 // Copyright 2015 the V8 project authors. All rights reserved. | 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 | 2 // Use of this source code is governed by a BSD-style license that can be |
| 3 // found in the LICENSE file. | 3 // found in the LICENSE file. |
| 4 | 4 |
| 5 #ifndef V8_WASM_DECODER_H_ | 5 #ifndef V8_WASM_DECODER_H_ |
| 6 #define V8_WASM_DECODER_H_ | 6 #define V8_WASM_DECODER_H_ |
| 7 | 7 |
| 8 #include "src/base/compiler-specific.h" | 8 #include "src/base/compiler-specific.h" |
| 9 #include "src/base/smart-pointers.h" | 9 #include "src/base/smart-pointers.h" |
| 10 #include "src/flags.h" | 10 #include "src/flags.h" |
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| 197 if (checkAvailable(4)) { | 197 if (checkAvailable(4)) { |
| 198 uint32_t val = read_u32(pc_); | 198 uint32_t val = read_u32(pc_); |
| 199 TRACE("%02x %02x %02x %02x = %u\n", pc_[0], pc_[1], pc_[2], pc_[3], val); | 199 TRACE("%02x %02x %02x %02x = %u\n", pc_[0], pc_[1], pc_[2], pc_[3], val); |
| 200 pc_ += 4; | 200 pc_ += 4; |
| 201 return val; | 201 return val; |
| 202 } | 202 } |
| 203 return traceOffEnd<uint32_t>(); | 203 return traceOffEnd<uint32_t>(); |
| 204 } | 204 } |
| 205 | 205 |
| 206 // Reads a LEB128 variable-length 32-bit integer and advances {pc_}. | 206 // Reads a LEB128 variable-length 32-bit integer and advances {pc_}. |
| 207 uint32_t consume_u32v(int* length, const char* name = nullptr) { | 207 uint32_t consume_u32v(const char* name = nullptr) { |
| 208 TRACE(" +%d %-20s: ", static_cast<int>(pc_ - start_), | 208 TRACE(" +%d %-20s: ", static_cast<int>(pc_ - start_), |
| 209 name ? name : "varint"); | 209 name ? name : "varint"); |
| 210 | |
| 211 if (checkAvailable(1)) { | 210 if (checkAvailable(1)) { |
| 212 const byte* pos = pc_; | 211 const byte* pos = pc_; |
| 213 const byte* end = pc_ + 5; | 212 const byte* end = pc_ + 5; |
| 214 if (end > limit_) end = limit_; | 213 if (end > limit_) end = limit_; |
| 215 | 214 |
| 216 uint32_t result = 0; | 215 uint32_t result = 0; |
| 217 int shift = 0; | 216 int shift = 0; |
| 218 byte b = 0; | 217 byte b = 0; |
| 219 while (pc_ < end) { | 218 while (pc_ < end) { |
| 220 b = *pc_++; | 219 b = *pc_++; |
| 221 TRACE("%02x ", b); | 220 TRACE("%02x ", b); |
| 222 result = result | ((b & 0x7F) << shift); | 221 result = result | ((b & 0x7F) << shift); |
| 223 if ((b & 0x80) == 0) break; | 222 if ((b & 0x80) == 0) break; |
| 224 shift += 7; | 223 shift += 7; |
| 225 } | 224 } |
| 226 | 225 |
| 227 *length = static_cast<int>(pc_ - pos); | 226 int length = static_cast<int>(pc_ - pos); |
| 228 if (pc_ == end && (b & 0x80)) { | 227 if (pc_ == end && (b & 0x80)) { |
| 229 error(pc_ - 1, "varint too large"); | 228 error(pc_ - 1, "varint too large"); |
| 230 } else if (*length == 0) { | 229 } else if (length == 0) { |
| 231 error(pc_, "varint of length 0"); | 230 error(pc_, "varint of length 0"); |
| 232 } else { | 231 } else { |
| 233 TRACE("= %u\n", result); | 232 TRACE("= %u\n", result); |
| 234 } | 233 } |
| 235 return result; | 234 return result; |
| 236 } | 235 } |
| 237 return traceOffEnd<uint32_t>(); | 236 return traceOffEnd<uint32_t>(); |
| 238 } | 237 } |
| 239 | 238 |
| 240 // Consume {size} bytes and send them to the bit bucket, advancing {pc_}. | 239 // Consume {size} bytes and send them to the bit bucket, advancing {pc_}. |
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| 402 return result; | 401 return result; |
| 403 } | 402 } |
| 404 }; | 403 }; |
| 405 | 404 |
| 406 #undef TRACE | 405 #undef TRACE |
| 407 } // namespace wasm | 406 } // namespace wasm |
| 408 } // namespace internal | 407 } // namespace internal |
| 409 } // namespace v8 | 408 } // namespace v8 |
| 410 | 409 |
| 411 #endif // V8_WASM_DECODER_H_ | 410 #endif // V8_WASM_DECODER_H_ |
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