Lei Zhang | 72e8b69 | 2019-02-05 19:16:52 +0000 | [diff] [blame] | 1 | // Copyright 2019 PDFium 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 "testing/v8_initializer.h" |
| 6 | |
Felix Kauselmann | 5fe8569 | 2019-02-11 20:55:52 +0000 | [diff] [blame] | 7 | #include <cstring> |
| 8 | |
Lei Zhang | b6992dd | 2019-02-05 23:30:20 +0000 | [diff] [blame] | 9 | #include "public/fpdfview.h" |
| 10 | #include "testing/utils/file_util.h" |
Lei Zhang | 72e8b69 | 2019-02-05 19:16:52 +0000 | [diff] [blame] | 11 | #include "testing/utils/path_service.h" |
| 12 | #include "v8/include/libplatform/libplatform.h" |
| 13 | #include "v8/include/v8.h" |
| 14 | |
| 15 | namespace { |
| 16 | |
| 17 | #ifdef V8_USE_EXTERNAL_STARTUP_DATA |
| 18 | // Returns the full path for an external V8 data file based on either |
| 19 | // the currect exectuable path or an explicit override. |
| 20 | std::string GetFullPathForSnapshotFile(const std::string& exe_path, |
| 21 | const std::string& bin_dir, |
| 22 | const std::string& filename) { |
| 23 | std::string result; |
| 24 | if (!bin_dir.empty()) { |
| 25 | result = bin_dir; |
| 26 | if (*bin_dir.rbegin() != PATH_SEPARATOR) { |
| 27 | result += PATH_SEPARATOR; |
| 28 | } |
| 29 | } else if (!exe_path.empty()) { |
| 30 | size_t last_separator = exe_path.rfind(PATH_SEPARATOR); |
| 31 | if (last_separator != std::string::npos) { |
| 32 | result = exe_path.substr(0, last_separator + 1); |
| 33 | } |
| 34 | } |
| 35 | result += filename; |
| 36 | return result; |
| 37 | } |
| 38 | |
| 39 | bool GetExternalData(const std::string& exe_path, |
| 40 | const std::string& bin_dir, |
| 41 | const std::string& filename, |
| 42 | v8::StartupData* result_data) { |
| 43 | std::string full_path = |
| 44 | GetFullPathForSnapshotFile(exe_path, bin_dir, filename); |
| 45 | size_t data_length = 0; |
| 46 | std::unique_ptr<char, pdfium::FreeDeleter> data_buffer = |
| 47 | GetFileContents(full_path.c_str(), &data_length); |
| 48 | if (!data_buffer) |
| 49 | return false; |
| 50 | |
| 51 | result_data->data = data_buffer.release(); |
| 52 | result_data->raw_size = data_length; |
| 53 | return true; |
| 54 | } |
| 55 | #endif // V8_USE_EXTERNAL_STARTUP_DATA |
| 56 | |
| 57 | std::unique_ptr<v8::Platform> InitializeV8Common(const std::string& exe_path) { |
| 58 | v8::V8::InitializeICUDefaultLocation(exe_path.c_str()); |
| 59 | |
| 60 | std::unique_ptr<v8::Platform> platform = v8::platform::NewDefaultPlatform(); |
| 61 | v8::V8::InitializePlatform(platform.get()); |
| 62 | |
| 63 | const char* recommended_v8_flags = FPDF_GetRecommendedV8Flags(); |
| 64 | v8::V8::SetFlagsFromString(recommended_v8_flags, |
| 65 | static_cast<int>(strlen(recommended_v8_flags))); |
| 66 | |
| 67 | // By enabling predictable mode, V8 won't post any background tasks. |
| 68 | // By enabling GC, it makes it easier to chase use-after-free. |
| 69 | static const char kAdditionalV8Flags[] = "--predictable --expose-gc"; |
| 70 | v8::V8::SetFlagsFromString(kAdditionalV8Flags, |
| 71 | static_cast<int>(strlen(kAdditionalV8Flags))); |
| 72 | |
| 73 | v8::V8::Initialize(); |
| 74 | return platform; |
| 75 | } |
| 76 | |
| 77 | } // namespace |
| 78 | |
| 79 | #ifdef V8_USE_EXTERNAL_STARTUP_DATA |
| 80 | std::unique_ptr<v8::Platform> InitializeV8ForPDFiumWithStartupData( |
| 81 | const std::string& exe_path, |
| 82 | const std::string& bin_dir, |
| 83 | v8::StartupData* natives_blob, |
| 84 | v8::StartupData* snapshot_blob) { |
| 85 | std::unique_ptr<v8::Platform> platform = InitializeV8Common(exe_path); |
| 86 | if (natives_blob && snapshot_blob) { |
| 87 | if (!GetExternalData(exe_path, bin_dir, "natives_blob.bin", natives_blob)) |
| 88 | return nullptr; |
| 89 | if (!GetExternalData(exe_path, bin_dir, "snapshot_blob.bin", snapshot_blob)) |
| 90 | return nullptr; |
| 91 | v8::V8::SetNativesDataBlob(natives_blob); |
| 92 | v8::V8::SetSnapshotDataBlob(snapshot_blob); |
| 93 | } |
| 94 | return platform; |
| 95 | } |
| 96 | #else // V8_USE_EXTERNAL_STARTUP_DATA |
| 97 | std::unique_ptr<v8::Platform> InitializeV8ForPDFium( |
| 98 | const std::string& exe_path) { |
| 99 | return InitializeV8Common(exe_path); |
| 100 | } |
| 101 | #endif // V8_USE_EXTERNAL_STARTUP_DATA |