Ben Murdoch | 4a90d5f | 2016-03-22 12:00:34 +0000 | [diff] [blame] | 1 | // Copyright 2012 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 | // LiveEdit feature implementation. The script should be executed after |
| 6 | // debug.js. |
| 7 | |
| 8 | // A LiveEdit namespace. It contains functions that modifies JavaScript code |
| 9 | // according to changes of script source (if possible). |
| 10 | // |
| 11 | // When new script source is put in, the difference is calculated textually, |
| 12 | // in form of list of delete/add/change chunks. The functions that include |
| 13 | // change chunk(s) get recompiled, or their enclosing functions are |
| 14 | // recompiled instead. |
| 15 | // If the function may not be recompiled (e.g. it was completely erased in new |
| 16 | // version of the script) it remains unchanged, but the code that could |
| 17 | // create a new instance of this function goes away. An old version of script |
| 18 | // is created to back up this obsolete function. |
| 19 | // All unchanged functions have their positions updated accordingly. |
| 20 | // |
| 21 | // LiveEdit namespace is declared inside a single function constructor. |
| 22 | |
| 23 | (function(global, utils) { |
| 24 | "use strict"; |
| 25 | |
| 26 | // ------------------------------------------------------------------- |
| 27 | // Imports |
| 28 | |
| 29 | var FindScriptSourcePosition = global.Debug.findScriptSourcePosition; |
| 30 | var GetScriptBreakPoints; |
| 31 | var GlobalArray = global.Array; |
| 32 | var MathFloor = global.Math.floor; |
| 33 | var SyntaxError = global.SyntaxError; |
| 34 | |
| 35 | utils.Import(function(from) { |
| 36 | GetScriptBreakPoints = from.GetScriptBreakPoints; |
| 37 | }); |
| 38 | |
| 39 | // ------------------------------------------------------------------- |
| 40 | |
| 41 | // Forward declaration for minifier. |
| 42 | var FunctionStatus; |
| 43 | |
| 44 | // Applies the change to the script. |
| 45 | // The change is in form of list of chunks encoded in a single array as |
| 46 | // a series of triplets (pos1_start, pos1_end, pos2_end) |
| 47 | function ApplyPatchMultiChunk(script, diff_array, new_source, preview_only, |
| 48 | change_log) { |
| 49 | |
| 50 | var old_source = script.source; |
| 51 | |
| 52 | // Gather compile information about old version of script. |
| 53 | var old_compile_info = GatherCompileInfo(old_source, script); |
| 54 | |
| 55 | // Build tree structures for old and new versions of the script. |
| 56 | var root_old_node = BuildCodeInfoTree(old_compile_info); |
| 57 | |
| 58 | var pos_translator = new PosTranslator(diff_array); |
| 59 | |
| 60 | // Analyze changes. |
| 61 | MarkChangedFunctions(root_old_node, pos_translator.GetChunks()); |
| 62 | |
| 63 | // Find all SharedFunctionInfo's that were compiled from this script. |
| 64 | FindLiveSharedInfos(root_old_node, script); |
| 65 | |
| 66 | // Gather compile information about new version of script. |
| 67 | var new_compile_info; |
| 68 | try { |
| 69 | new_compile_info = GatherCompileInfo(new_source, script); |
| 70 | } catch (e) { |
| 71 | var failure = |
| 72 | new Failure("Failed to compile new version of script: " + e); |
| 73 | if (e instanceof SyntaxError) { |
| 74 | var details = { |
| 75 | type: "liveedit_compile_error", |
| 76 | syntaxErrorMessage: e.message |
| 77 | }; |
| 78 | CopyErrorPositionToDetails(e, details); |
| 79 | failure.details = details; |
| 80 | } |
| 81 | throw failure; |
| 82 | } |
| 83 | var root_new_node = BuildCodeInfoTree(new_compile_info); |
| 84 | |
| 85 | // Link recompiled script data with other data. |
| 86 | FindCorrespondingFunctions(root_old_node, root_new_node); |
| 87 | |
| 88 | // Prepare to-do lists. |
| 89 | var replace_code_list = new GlobalArray(); |
| 90 | var link_to_old_script_list = new GlobalArray(); |
| 91 | var link_to_original_script_list = new GlobalArray(); |
| 92 | var update_positions_list = new GlobalArray(); |
| 93 | |
| 94 | function HarvestTodo(old_node) { |
| 95 | function CollectDamaged(node) { |
| 96 | link_to_old_script_list.push(node); |
| 97 | for (var i = 0; i < node.children.length; i++) { |
| 98 | CollectDamaged(node.children[i]); |
| 99 | } |
| 100 | } |
| 101 | |
| 102 | // Recursively collects all newly compiled functions that are going into |
| 103 | // business and should have link to the actual script updated. |
| 104 | function CollectNew(node_list) { |
| 105 | for (var i = 0; i < node_list.length; i++) { |
| 106 | link_to_original_script_list.push(node_list[i]); |
| 107 | CollectNew(node_list[i].children); |
| 108 | } |
| 109 | } |
| 110 | |
| 111 | if (old_node.status == FunctionStatus.DAMAGED) { |
| 112 | CollectDamaged(old_node); |
| 113 | return; |
| 114 | } |
| 115 | if (old_node.status == FunctionStatus.UNCHANGED) { |
| 116 | update_positions_list.push(old_node); |
| 117 | } else if (old_node.status == FunctionStatus.SOURCE_CHANGED) { |
| 118 | update_positions_list.push(old_node); |
| 119 | } else if (old_node.status == FunctionStatus.CHANGED) { |
| 120 | replace_code_list.push(old_node); |
| 121 | CollectNew(old_node.unmatched_new_nodes); |
| 122 | } |
| 123 | for (var i = 0; i < old_node.children.length; i++) { |
| 124 | HarvestTodo(old_node.children[i]); |
| 125 | } |
| 126 | } |
| 127 | |
| 128 | var preview_description = { |
| 129 | change_tree: DescribeChangeTree(root_old_node), |
| 130 | textual_diff: { |
| 131 | old_len: old_source.length, |
| 132 | new_len: new_source.length, |
| 133 | chunks: diff_array |
| 134 | }, |
| 135 | updated: false |
| 136 | }; |
| 137 | |
| 138 | if (preview_only) { |
| 139 | return preview_description; |
| 140 | } |
| 141 | |
| 142 | HarvestTodo(root_old_node); |
| 143 | |
| 144 | // Collect shared infos for functions whose code need to be patched. |
| 145 | var replaced_function_old_infos = new GlobalArray(); |
| 146 | var replaced_function_new_infos = new GlobalArray(); |
| 147 | for (var i = 0; i < replace_code_list.length; i++) { |
| 148 | var old_infos = replace_code_list[i].live_shared_function_infos; |
| 149 | var new_info = |
| 150 | replace_code_list[i].corresponding_node.info.shared_function_info; |
| 151 | |
| 152 | if (old_infos) { |
| 153 | for (var j = 0; j < old_infos.length; j++) { |
| 154 | replaced_function_old_infos.push(old_infos[j]); |
| 155 | replaced_function_new_infos.push(new_info); |
| 156 | } |
| 157 | } |
| 158 | } |
| 159 | |
| 160 | // We haven't changed anything before this line yet. |
| 161 | // Committing all changes. |
| 162 | |
| 163 | // Check that function being patched is not currently on stack or drop them. |
| 164 | var dropped_functions_number = |
| 165 | CheckStackActivations(replaced_function_old_infos, |
| 166 | replaced_function_new_infos, |
| 167 | change_log); |
| 168 | |
| 169 | // Our current implementation requires client to manually issue "step in" |
| 170 | // command for correct stack state if the stack was modified. |
| 171 | preview_description.stack_modified = dropped_functions_number != 0; |
| 172 | |
| 173 | // Start with breakpoints. Convert their line/column positions and |
| 174 | // temporary remove. |
| 175 | var break_points_restorer = TemporaryRemoveBreakPoints(script, change_log); |
| 176 | |
| 177 | var old_script; |
| 178 | |
| 179 | // Create an old script only if there are function that should be linked |
| 180 | // to old version. |
| 181 | if (link_to_old_script_list.length == 0) { |
| 182 | %LiveEditReplaceScript(script, new_source, null); |
| 183 | old_script = UNDEFINED; |
| 184 | } else { |
| 185 | var old_script_name = CreateNameForOldScript(script); |
| 186 | |
| 187 | // Update the script text and create a new script representing an old |
| 188 | // version of the script. |
| 189 | old_script = %LiveEditReplaceScript(script, new_source, |
| 190 | old_script_name); |
| 191 | |
| 192 | var link_to_old_script_report = new GlobalArray(); |
| 193 | change_log.push( { linked_to_old_script: link_to_old_script_report } ); |
| 194 | |
| 195 | // We need to link to old script all former nested functions. |
| 196 | for (var i = 0; i < link_to_old_script_list.length; i++) { |
| 197 | LinkToOldScript(link_to_old_script_list[i], old_script, |
| 198 | link_to_old_script_report); |
| 199 | } |
| 200 | |
| 201 | preview_description.created_script_name = old_script_name; |
| 202 | } |
| 203 | |
| 204 | // Link to an actual script all the functions that we are going to use. |
| 205 | for (var i = 0; i < link_to_original_script_list.length; i++) { |
| 206 | %LiveEditFunctionSetScript( |
| 207 | link_to_original_script_list[i].info.shared_function_info, script); |
| 208 | } |
| 209 | |
| 210 | for (var i = 0; i < replace_code_list.length; i++) { |
| 211 | PatchFunctionCode(replace_code_list[i], change_log); |
| 212 | } |
| 213 | |
| 214 | var position_patch_report = new GlobalArray(); |
| 215 | change_log.push( {position_patched: position_patch_report} ); |
| 216 | |
| 217 | for (var i = 0; i < update_positions_list.length; i++) { |
| 218 | // TODO(LiveEdit): take into account whether it's source_changed or |
| 219 | // unchanged and whether positions changed at all. |
| 220 | PatchPositions(update_positions_list[i], diff_array, |
| 221 | position_patch_report); |
| 222 | |
| 223 | if (update_positions_list[i].live_shared_function_infos) { |
| 224 | update_positions_list[i].live_shared_function_infos. |
| 225 | forEach(function (info) { |
| 226 | %LiveEditFunctionSourceUpdated(info.raw_array); |
| 227 | }); |
| 228 | } |
| 229 | } |
| 230 | |
| 231 | break_points_restorer(pos_translator, old_script); |
| 232 | |
| 233 | preview_description.updated = true; |
| 234 | return preview_description; |
| 235 | } |
| 236 | |
| 237 | // Fully compiles source string as a script. Returns Array of |
| 238 | // FunctionCompileInfo -- a descriptions of all functions of the script. |
| 239 | // Elements of array are ordered by start positions of functions (from top |
| 240 | // to bottom) in the source. Fields outer_index and next_sibling_index help |
| 241 | // to navigate the nesting structure of functions. |
| 242 | // |
| 243 | // All functions get compiled linked to script provided as parameter script. |
| 244 | // TODO(LiveEdit): consider not using actual scripts as script, because |
| 245 | // we have to manually erase all links right after compile. |
| 246 | function GatherCompileInfo(source, script) { |
| 247 | // Get function info, elements are partially sorted (it is a tree of |
| 248 | // nested functions serialized as parent followed by serialized children. |
| 249 | var raw_compile_info = %LiveEditGatherCompileInfo(script, source); |
| 250 | |
| 251 | // Sort function infos by start position field. |
| 252 | var compile_info = new GlobalArray(); |
| 253 | var old_index_map = new GlobalArray(); |
| 254 | for (var i = 0; i < raw_compile_info.length; i++) { |
| 255 | var info = new FunctionCompileInfo(raw_compile_info[i]); |
| 256 | // Remove all links to the actual script. Breakpoints system and |
| 257 | // LiveEdit itself believe that any function in heap that points to a |
| 258 | // particular script is a regular function. |
| 259 | // For some functions we will restore this link later. |
| 260 | %LiveEditFunctionSetScript(info.shared_function_info, UNDEFINED); |
| 261 | compile_info.push(info); |
| 262 | old_index_map.push(i); |
| 263 | } |
| 264 | |
| 265 | for (var i = 0; i < compile_info.length; i++) { |
| 266 | var k = i; |
| 267 | for (var j = i + 1; j < compile_info.length; j++) { |
| 268 | if (compile_info[k].start_position > compile_info[j].start_position) { |
| 269 | k = j; |
| 270 | } |
| 271 | } |
| 272 | if (k != i) { |
| 273 | var temp_info = compile_info[k]; |
| 274 | var temp_index = old_index_map[k]; |
| 275 | compile_info[k] = compile_info[i]; |
| 276 | old_index_map[k] = old_index_map[i]; |
| 277 | compile_info[i] = temp_info; |
| 278 | old_index_map[i] = temp_index; |
| 279 | } |
| 280 | } |
| 281 | |
| 282 | // After sorting update outer_index field using old_index_map. Also |
| 283 | // set next_sibling_index field. |
| 284 | var current_index = 0; |
| 285 | |
| 286 | // The recursive function, that goes over all children of a particular |
| 287 | // node (i.e. function info). |
| 288 | function ResetIndexes(new_parent_index, old_parent_index) { |
| 289 | var previous_sibling = -1; |
| 290 | while (current_index < compile_info.length && |
| 291 | compile_info[current_index].outer_index == old_parent_index) { |
| 292 | var saved_index = current_index; |
| 293 | compile_info[saved_index].outer_index = new_parent_index; |
| 294 | if (previous_sibling != -1) { |
| 295 | compile_info[previous_sibling].next_sibling_index = saved_index; |
| 296 | } |
| 297 | previous_sibling = saved_index; |
| 298 | current_index++; |
| 299 | ResetIndexes(saved_index, old_index_map[saved_index]); |
| 300 | } |
| 301 | if (previous_sibling != -1) { |
| 302 | compile_info[previous_sibling].next_sibling_index = -1; |
| 303 | } |
| 304 | } |
| 305 | |
| 306 | ResetIndexes(-1, -1); |
| 307 | Assert(current_index == compile_info.length); |
| 308 | |
| 309 | return compile_info; |
| 310 | } |
| 311 | |
| 312 | |
| 313 | // Replaces function's Code. |
| 314 | function PatchFunctionCode(old_node, change_log) { |
| 315 | var new_info = old_node.corresponding_node.info; |
| 316 | if (old_node.live_shared_function_infos) { |
| 317 | old_node.live_shared_function_infos.forEach(function (old_info) { |
| 318 | %LiveEditReplaceFunctionCode(new_info.raw_array, |
| 319 | old_info.raw_array); |
| 320 | |
| 321 | // The function got a new code. However, this new code brings all new |
| 322 | // instances of SharedFunctionInfo for nested functions. However, |
| 323 | // we want the original instances to be used wherever possible. |
| 324 | // (This is because old instances and new instances will be both |
| 325 | // linked to a script and breakpoints subsystem does not really |
| 326 | // expects this; neither does LiveEdit subsystem on next call). |
| 327 | for (var i = 0; i < old_node.children.length; i++) { |
| 328 | if (old_node.children[i].corresponding_node) { |
| 329 | var corresponding_child_info = |
| 330 | old_node.children[i].corresponding_node.info. |
| 331 | shared_function_info; |
| 332 | |
| 333 | if (old_node.children[i].live_shared_function_infos) { |
| 334 | old_node.children[i].live_shared_function_infos. |
| 335 | forEach(function (old_child_info) { |
| 336 | %LiveEditReplaceRefToNestedFunction( |
| 337 | old_info.info, |
| 338 | corresponding_child_info, |
| 339 | old_child_info.info); |
| 340 | }); |
| 341 | } |
| 342 | } |
| 343 | } |
| 344 | }); |
| 345 | |
| 346 | change_log.push( {function_patched: new_info.function_name} ); |
| 347 | } else { |
| 348 | change_log.push( {function_patched: new_info.function_name, |
| 349 | function_info_not_found: true} ); |
| 350 | } |
| 351 | } |
| 352 | |
| 353 | |
| 354 | // Makes a function associated with another instance of a script (the |
| 355 | // one representing its old version). This way the function still |
| 356 | // may access its own text. |
| 357 | function LinkToOldScript(old_info_node, old_script, report_array) { |
| 358 | if (old_info_node.live_shared_function_infos) { |
| 359 | old_info_node.live_shared_function_infos. |
| 360 | forEach(function (info) { |
| 361 | %LiveEditFunctionSetScript(info.info, old_script); |
| 362 | }); |
| 363 | |
| 364 | report_array.push( { name: old_info_node.info.function_name } ); |
| 365 | } else { |
| 366 | report_array.push( |
| 367 | { name: old_info_node.info.function_name, not_found: true } ); |
| 368 | } |
| 369 | } |
| 370 | |
| 371 | |
| 372 | // Returns function that restores breakpoints. |
| 373 | function TemporaryRemoveBreakPoints(original_script, change_log) { |
| 374 | var script_break_points = GetScriptBreakPoints(original_script); |
| 375 | |
| 376 | var break_points_update_report = []; |
| 377 | change_log.push( { break_points_update: break_points_update_report } ); |
| 378 | |
| 379 | var break_point_old_positions = []; |
| 380 | for (var i = 0; i < script_break_points.length; i++) { |
| 381 | var break_point = script_break_points[i]; |
| 382 | |
| 383 | break_point.clear(); |
| 384 | |
| 385 | // TODO(LiveEdit): be careful with resource offset here. |
| 386 | var break_point_position = FindScriptSourcePosition(original_script, |
| 387 | break_point.line(), break_point.column()); |
| 388 | |
| 389 | var old_position_description = { |
| 390 | position: break_point_position, |
| 391 | line: break_point.line(), |
| 392 | column: break_point.column() |
| 393 | }; |
| 394 | break_point_old_positions.push(old_position_description); |
| 395 | } |
| 396 | |
| 397 | |
| 398 | // Restores breakpoints and creates their copies in the "old" copy of |
| 399 | // the script. |
| 400 | return function (pos_translator, old_script_copy_opt) { |
| 401 | // Update breakpoints (change positions and restore them in old version |
| 402 | // of script. |
| 403 | for (var i = 0; i < script_break_points.length; i++) { |
| 404 | var break_point = script_break_points[i]; |
| 405 | if (old_script_copy_opt) { |
| 406 | var clone = break_point.cloneForOtherScript(old_script_copy_opt); |
| 407 | clone.set(old_script_copy_opt); |
| 408 | |
| 409 | break_points_update_report.push( { |
| 410 | type: "copied_to_old", |
| 411 | id: break_point.number(), |
| 412 | new_id: clone.number(), |
| 413 | positions: break_point_old_positions[i] |
| 414 | } ); |
| 415 | } |
| 416 | |
| 417 | var updated_position = pos_translator.Translate( |
| 418 | break_point_old_positions[i].position, |
| 419 | PosTranslator.ShiftWithTopInsideChunkHandler); |
| 420 | |
| 421 | var new_location = |
| 422 | original_script.locationFromPosition(updated_position, false); |
| 423 | |
| 424 | break_point.update_positions(new_location.line, new_location.column); |
| 425 | |
| 426 | var new_position_description = { |
| 427 | position: updated_position, |
| 428 | line: new_location.line, |
| 429 | column: new_location.column |
| 430 | }; |
| 431 | |
| 432 | break_point.set(original_script); |
| 433 | |
| 434 | break_points_update_report.push( { type: "position_changed", |
| 435 | id: break_point.number(), |
| 436 | old_positions: break_point_old_positions[i], |
| 437 | new_positions: new_position_description |
| 438 | } ); |
| 439 | } |
| 440 | }; |
| 441 | } |
| 442 | |
| 443 | |
| 444 | function Assert(condition, message) { |
| 445 | if (!condition) { |
| 446 | if (message) { |
| 447 | throw "Assert " + message; |
| 448 | } else { |
| 449 | throw "Assert"; |
| 450 | } |
| 451 | } |
| 452 | } |
| 453 | |
| 454 | function DiffChunk(pos1, pos2, len1, len2) { |
| 455 | this.pos1 = pos1; |
| 456 | this.pos2 = pos2; |
| 457 | this.len1 = len1; |
| 458 | this.len2 = len2; |
| 459 | } |
| 460 | |
| 461 | function PosTranslator(diff_array) { |
| 462 | var chunks = new GlobalArray(); |
| 463 | var current_diff = 0; |
| 464 | for (var i = 0; i < diff_array.length; i += 3) { |
| 465 | var pos1_begin = diff_array[i]; |
| 466 | var pos2_begin = pos1_begin + current_diff; |
| 467 | var pos1_end = diff_array[i + 1]; |
| 468 | var pos2_end = diff_array[i + 2]; |
| 469 | chunks.push(new DiffChunk(pos1_begin, pos2_begin, pos1_end - pos1_begin, |
| 470 | pos2_end - pos2_begin)); |
| 471 | current_diff = pos2_end - pos1_end; |
| 472 | } |
| 473 | this.chunks = chunks; |
| 474 | } |
| 475 | PosTranslator.prototype.GetChunks = function() { |
| 476 | return this.chunks; |
| 477 | }; |
| 478 | |
| 479 | PosTranslator.prototype.Translate = function(pos, inside_chunk_handler) { |
| 480 | var array = this.chunks; |
| 481 | if (array.length == 0 || pos < array[0].pos1) { |
| 482 | return pos; |
| 483 | } |
| 484 | var chunk_index1 = 0; |
| 485 | var chunk_index2 = array.length - 1; |
| 486 | |
| 487 | while (chunk_index1 < chunk_index2) { |
| 488 | var middle_index = MathFloor((chunk_index1 + chunk_index2) / 2); |
| 489 | if (pos < array[middle_index + 1].pos1) { |
| 490 | chunk_index2 = middle_index; |
| 491 | } else { |
| 492 | chunk_index1 = middle_index + 1; |
| 493 | } |
| 494 | } |
| 495 | var chunk = array[chunk_index1]; |
| 496 | if (pos >= chunk.pos1 + chunk.len1) { |
| 497 | return pos + chunk.pos2 + chunk.len2 - chunk.pos1 - chunk.len1; |
| 498 | } |
| 499 | |
| 500 | if (!inside_chunk_handler) { |
| 501 | inside_chunk_handler = PosTranslator.DefaultInsideChunkHandler; |
| 502 | } |
| 503 | return inside_chunk_handler(pos, chunk); |
| 504 | }; |
| 505 | |
| 506 | PosTranslator.DefaultInsideChunkHandler = function(pos, diff_chunk) { |
| 507 | Assert(false, "Cannot translate position in changed area"); |
| 508 | }; |
| 509 | |
| 510 | PosTranslator.ShiftWithTopInsideChunkHandler = |
| 511 | function(pos, diff_chunk) { |
| 512 | // We carelessly do not check whether we stay inside the chunk after |
| 513 | // translation. |
| 514 | return pos - diff_chunk.pos1 + diff_chunk.pos2; |
| 515 | }; |
| 516 | |
| 517 | var FunctionStatus = { |
| 518 | // No change to function or its inner functions; however its positions |
| 519 | // in script may have been shifted. |
| 520 | UNCHANGED: "unchanged", |
| 521 | // The code of a function remains unchanged, but something happened inside |
| 522 | // some inner functions. |
| 523 | SOURCE_CHANGED: "source changed", |
| 524 | // The code of a function is changed or some nested function cannot be |
| 525 | // properly patched so this function must be recompiled. |
| 526 | CHANGED: "changed", |
| 527 | // Function is changed but cannot be patched. |
| 528 | DAMAGED: "damaged" |
| 529 | }; |
| 530 | |
| 531 | function CodeInfoTreeNode(code_info, children, array_index) { |
| 532 | this.info = code_info; |
| 533 | this.children = children; |
| 534 | // an index in array of compile_info |
| 535 | this.array_index = array_index; |
| 536 | this.parent = UNDEFINED; |
| 537 | |
| 538 | this.status = FunctionStatus.UNCHANGED; |
| 539 | // Status explanation is used for debugging purposes and will be shown |
| 540 | // in user UI if some explanations are needed. |
| 541 | this.status_explanation = UNDEFINED; |
| 542 | this.new_start_pos = UNDEFINED; |
| 543 | this.new_end_pos = UNDEFINED; |
| 544 | this.corresponding_node = UNDEFINED; |
| 545 | this.unmatched_new_nodes = UNDEFINED; |
| 546 | |
| 547 | // 'Textual' correspondence/matching is weaker than 'pure' |
| 548 | // correspondence/matching. We need 'textual' level for visual presentation |
| 549 | // in UI, we use 'pure' level for actual code manipulation. |
| 550 | // Sometimes only function body is changed (functions in old and new script |
| 551 | // textually correspond), but we cannot patch the code, so we see them |
| 552 | // as an old function deleted and new function created. |
| 553 | this.textual_corresponding_node = UNDEFINED; |
| 554 | this.textually_unmatched_new_nodes = UNDEFINED; |
| 555 | |
| 556 | this.live_shared_function_infos = UNDEFINED; |
| 557 | } |
| 558 | |
| 559 | // From array of function infos that is implicitly a tree creates |
| 560 | // an actual tree of functions in script. |
| 561 | function BuildCodeInfoTree(code_info_array) { |
| 562 | // Throughtout all function we iterate over input array. |
| 563 | var index = 0; |
| 564 | |
| 565 | // Recursive function that builds a branch of tree. |
| 566 | function BuildNode() { |
| 567 | var my_index = index; |
| 568 | index++; |
| 569 | var child_array = new GlobalArray(); |
| 570 | while (index < code_info_array.length && |
| 571 | code_info_array[index].outer_index == my_index) { |
| 572 | child_array.push(BuildNode()); |
| 573 | } |
| 574 | var node = new CodeInfoTreeNode(code_info_array[my_index], child_array, |
| 575 | my_index); |
| 576 | for (var i = 0; i < child_array.length; i++) { |
| 577 | child_array[i].parent = node; |
| 578 | } |
| 579 | return node; |
| 580 | } |
| 581 | |
| 582 | var root = BuildNode(); |
| 583 | Assert(index == code_info_array.length); |
| 584 | return root; |
| 585 | } |
| 586 | |
| 587 | // Applies a list of the textual diff chunks onto the tree of functions. |
| 588 | // Determines status of each function (from unchanged to damaged). However |
| 589 | // children of unchanged functions are ignored. |
| 590 | function MarkChangedFunctions(code_info_tree, chunks) { |
| 591 | |
| 592 | // A convenient iterator over diff chunks that also translates |
| 593 | // positions from old to new in a current non-changed part of script. |
| 594 | var chunk_it = new function() { |
| 595 | var chunk_index = 0; |
| 596 | var pos_diff = 0; |
| 597 | this.current = function() { return chunks[chunk_index]; }; |
| 598 | this.next = function() { |
| 599 | var chunk = chunks[chunk_index]; |
| 600 | pos_diff = chunk.pos2 + chunk.len2 - (chunk.pos1 + chunk.len1); |
| 601 | chunk_index++; |
| 602 | }; |
| 603 | this.done = function() { return chunk_index >= chunks.length; }; |
| 604 | this.TranslatePos = function(pos) { return pos + pos_diff; }; |
| 605 | }; |
| 606 | |
| 607 | // A recursive function that processes internals of a function and all its |
| 608 | // inner functions. Iterator chunk_it initially points to a chunk that is |
| 609 | // below function start. |
| 610 | function ProcessInternals(info_node) { |
| 611 | info_node.new_start_pos = chunk_it.TranslatePos( |
| 612 | info_node.info.start_position); |
| 613 | var child_index = 0; |
| 614 | var code_changed = false; |
| 615 | var source_changed = false; |
| 616 | // Simultaneously iterates over child functions and over chunks. |
| 617 | while (!chunk_it.done() && |
| 618 | chunk_it.current().pos1 < info_node.info.end_position) { |
| 619 | if (child_index < info_node.children.length) { |
| 620 | var child = info_node.children[child_index]; |
| 621 | |
| 622 | if (child.info.end_position <= chunk_it.current().pos1) { |
| 623 | ProcessUnchangedChild(child); |
| 624 | child_index++; |
| 625 | continue; |
| 626 | } else if (child.info.start_position >= |
| 627 | chunk_it.current().pos1 + chunk_it.current().len1) { |
| 628 | code_changed = true; |
| 629 | chunk_it.next(); |
| 630 | continue; |
| 631 | } else if (child.info.start_position <= chunk_it.current().pos1 && |
| 632 | child.info.end_position >= chunk_it.current().pos1 + |
| 633 | chunk_it.current().len1) { |
| 634 | ProcessInternals(child); |
| 635 | source_changed = source_changed || |
| 636 | ( child.status != FunctionStatus.UNCHANGED ); |
| 637 | code_changed = code_changed || |
| 638 | ( child.status == FunctionStatus.DAMAGED ); |
| 639 | child_index++; |
| 640 | continue; |
| 641 | } else { |
| 642 | code_changed = true; |
| 643 | child.status = FunctionStatus.DAMAGED; |
| 644 | child.status_explanation = |
| 645 | "Text diff overlaps with function boundary"; |
| 646 | child_index++; |
| 647 | continue; |
| 648 | } |
| 649 | } else { |
| 650 | if (chunk_it.current().pos1 + chunk_it.current().len1 <= |
| 651 | info_node.info.end_position) { |
| 652 | info_node.status = FunctionStatus.CHANGED; |
| 653 | chunk_it.next(); |
| 654 | continue; |
| 655 | } else { |
| 656 | info_node.status = FunctionStatus.DAMAGED; |
| 657 | info_node.status_explanation = |
| 658 | "Text diff overlaps with function boundary"; |
| 659 | return; |
| 660 | } |
| 661 | } |
| 662 | Assert("Unreachable", false); |
| 663 | } |
| 664 | while (child_index < info_node.children.length) { |
| 665 | var child = info_node.children[child_index]; |
| 666 | ProcessUnchangedChild(child); |
| 667 | child_index++; |
| 668 | } |
| 669 | if (code_changed) { |
| 670 | info_node.status = FunctionStatus.CHANGED; |
| 671 | } else if (source_changed) { |
| 672 | info_node.status = FunctionStatus.SOURCE_CHANGED; |
| 673 | } |
| 674 | info_node.new_end_pos = |
| 675 | chunk_it.TranslatePos(info_node.info.end_position); |
| 676 | } |
| 677 | |
| 678 | function ProcessUnchangedChild(node) { |
| 679 | node.new_start_pos = chunk_it.TranslatePos(node.info.start_position); |
| 680 | node.new_end_pos = chunk_it.TranslatePos(node.info.end_position); |
| 681 | } |
| 682 | |
| 683 | ProcessInternals(code_info_tree); |
| 684 | } |
| 685 | |
| 686 | // For each old function (if it is not damaged) tries to find a corresponding |
| 687 | // function in new script. Typically it should succeed (non-damaged functions |
| 688 | // by definition may only have changes inside their bodies). However there are |
| 689 | // reasons for correspondence not to be found; function with unmodified text |
| 690 | // in new script may become enclosed into other function; the innocent change |
| 691 | // inside function body may in fact be something like "} function B() {" that |
| 692 | // splits a function into 2 functions. |
| 693 | function FindCorrespondingFunctions(old_code_tree, new_code_tree) { |
| 694 | |
| 695 | // A recursive function that tries to find a correspondence for all |
| 696 | // child functions and for their inner functions. |
| 697 | function ProcessNode(old_node, new_node) { |
| 698 | var scope_change_description = |
| 699 | IsFunctionContextLocalsChanged(old_node.info, new_node.info); |
| 700 | if (scope_change_description) { |
| 701 | old_node.status = FunctionStatus.CHANGED; |
| 702 | } |
| 703 | |
| 704 | var old_children = old_node.children; |
| 705 | var new_children = new_node.children; |
| 706 | |
| 707 | var unmatched_new_nodes_list = []; |
| 708 | var textually_unmatched_new_nodes_list = []; |
| 709 | |
| 710 | var old_index = 0; |
| 711 | var new_index = 0; |
| 712 | while (old_index < old_children.length) { |
| 713 | if (old_children[old_index].status == FunctionStatus.DAMAGED) { |
| 714 | old_index++; |
| 715 | } else if (new_index < new_children.length) { |
| 716 | if (new_children[new_index].info.start_position < |
| 717 | old_children[old_index].new_start_pos) { |
| 718 | unmatched_new_nodes_list.push(new_children[new_index]); |
| 719 | textually_unmatched_new_nodes_list.push(new_children[new_index]); |
| 720 | new_index++; |
| 721 | } else if (new_children[new_index].info.start_position == |
| 722 | old_children[old_index].new_start_pos) { |
| 723 | if (new_children[new_index].info.end_position == |
| 724 | old_children[old_index].new_end_pos) { |
| 725 | old_children[old_index].corresponding_node = |
| 726 | new_children[new_index]; |
| 727 | old_children[old_index].textual_corresponding_node = |
| 728 | new_children[new_index]; |
| 729 | if (scope_change_description) { |
| 730 | old_children[old_index].status = FunctionStatus.DAMAGED; |
| 731 | old_children[old_index].status_explanation = |
| 732 | "Enclosing function is now incompatible. " + |
| 733 | scope_change_description; |
| 734 | old_children[old_index].corresponding_node = UNDEFINED; |
| 735 | } else if (old_children[old_index].status != |
| 736 | FunctionStatus.UNCHANGED) { |
| 737 | ProcessNode(old_children[old_index], |
| 738 | new_children[new_index]); |
| 739 | if (old_children[old_index].status == FunctionStatus.DAMAGED) { |
| 740 | unmatched_new_nodes_list.push( |
| 741 | old_children[old_index].corresponding_node); |
| 742 | old_children[old_index].corresponding_node = UNDEFINED; |
| 743 | old_node.status = FunctionStatus.CHANGED; |
| 744 | } |
| 745 | } |
| 746 | } else { |
| 747 | old_children[old_index].status = FunctionStatus.DAMAGED; |
| 748 | old_children[old_index].status_explanation = |
| 749 | "No corresponding function in new script found"; |
| 750 | old_node.status = FunctionStatus.CHANGED; |
| 751 | unmatched_new_nodes_list.push(new_children[new_index]); |
| 752 | textually_unmatched_new_nodes_list.push(new_children[new_index]); |
| 753 | } |
| 754 | new_index++; |
| 755 | old_index++; |
| 756 | } else { |
| 757 | old_children[old_index].status = FunctionStatus.DAMAGED; |
| 758 | old_children[old_index].status_explanation = |
| 759 | "No corresponding function in new script found"; |
| 760 | old_node.status = FunctionStatus.CHANGED; |
| 761 | old_index++; |
| 762 | } |
| 763 | } else { |
| 764 | old_children[old_index].status = FunctionStatus.DAMAGED; |
| 765 | old_children[old_index].status_explanation = |
| 766 | "No corresponding function in new script found"; |
| 767 | old_node.status = FunctionStatus.CHANGED; |
| 768 | old_index++; |
| 769 | } |
| 770 | } |
| 771 | |
| 772 | while (new_index < new_children.length) { |
| 773 | unmatched_new_nodes_list.push(new_children[new_index]); |
| 774 | textually_unmatched_new_nodes_list.push(new_children[new_index]); |
| 775 | new_index++; |
| 776 | } |
| 777 | |
| 778 | if (old_node.status == FunctionStatus.CHANGED) { |
| 779 | if (old_node.info.param_num != new_node.info.param_num) { |
| 780 | old_node.status = FunctionStatus.DAMAGED; |
| 781 | old_node.status_explanation = "Changed parameter number: " + |
| 782 | old_node.info.param_num + " and " + new_node.info.param_num; |
| 783 | } |
| 784 | } |
| 785 | old_node.unmatched_new_nodes = unmatched_new_nodes_list; |
| 786 | old_node.textually_unmatched_new_nodes = |
| 787 | textually_unmatched_new_nodes_list; |
| 788 | } |
| 789 | |
| 790 | ProcessNode(old_code_tree, new_code_tree); |
| 791 | |
| 792 | old_code_tree.corresponding_node = new_code_tree; |
| 793 | old_code_tree.textual_corresponding_node = new_code_tree; |
| 794 | |
| 795 | Assert(old_code_tree.status != FunctionStatus.DAMAGED, |
| 796 | "Script became damaged"); |
| 797 | } |
| 798 | |
| 799 | function FindLiveSharedInfos(old_code_tree, script) { |
| 800 | var shared_raw_list = %LiveEditFindSharedFunctionInfosForScript(script); |
| 801 | |
| 802 | var shared_infos = new GlobalArray(); |
| 803 | |
| 804 | for (var i = 0; i < shared_raw_list.length; i++) { |
| 805 | shared_infos.push(new SharedInfoWrapper(shared_raw_list[i])); |
| 806 | } |
| 807 | |
| 808 | // Finds all SharedFunctionInfos that corresponds to compile info |
| 809 | // in old version of the script. |
| 810 | function FindFunctionInfos(compile_info) { |
| 811 | var wrappers = []; |
| 812 | |
| 813 | for (var i = 0; i < shared_infos.length; i++) { |
| 814 | var wrapper = shared_infos[i]; |
| 815 | if (wrapper.start_position == compile_info.start_position && |
| 816 | wrapper.end_position == compile_info.end_position) { |
| 817 | wrappers.push(wrapper); |
| 818 | } |
| 819 | } |
| 820 | |
| 821 | if (wrappers.length > 0) { |
| 822 | return wrappers; |
| 823 | } |
| 824 | } |
| 825 | |
| 826 | function TraverseTree(node) { |
| 827 | node.live_shared_function_infos = FindFunctionInfos(node.info); |
| 828 | |
| 829 | for (var i = 0; i < node.children.length; i++) { |
| 830 | TraverseTree(node.children[i]); |
| 831 | } |
| 832 | } |
| 833 | |
| 834 | TraverseTree(old_code_tree); |
| 835 | } |
| 836 | |
| 837 | |
| 838 | // An object describing function compilation details. Its index fields |
| 839 | // apply to indexes inside array that stores these objects. |
| 840 | function FunctionCompileInfo(raw_array) { |
| 841 | this.function_name = raw_array[0]; |
| 842 | this.start_position = raw_array[1]; |
| 843 | this.end_position = raw_array[2]; |
| 844 | this.param_num = raw_array[3]; |
| 845 | this.code = raw_array[4]; |
| 846 | this.code_scope_info = raw_array[5]; |
| 847 | this.scope_info = raw_array[6]; |
| 848 | this.outer_index = raw_array[7]; |
| 849 | this.shared_function_info = raw_array[8]; |
| 850 | this.next_sibling_index = null; |
| 851 | this.raw_array = raw_array; |
| 852 | } |
| 853 | |
| 854 | function SharedInfoWrapper(raw_array) { |
| 855 | this.function_name = raw_array[0]; |
| 856 | this.start_position = raw_array[1]; |
| 857 | this.end_position = raw_array[2]; |
| 858 | this.info = raw_array[3]; |
| 859 | this.raw_array = raw_array; |
| 860 | } |
| 861 | |
| 862 | // Changes positions (including all statements) in function. |
| 863 | function PatchPositions(old_info_node, diff_array, report_array) { |
| 864 | if (old_info_node.live_shared_function_infos) { |
| 865 | old_info_node.live_shared_function_infos.forEach(function (info) { |
| 866 | %LiveEditPatchFunctionPositions(info.raw_array, |
| 867 | diff_array); |
| 868 | }); |
| 869 | |
| 870 | report_array.push( { name: old_info_node.info.function_name } ); |
| 871 | } else { |
| 872 | // TODO(LiveEdit): function is not compiled yet or is already collected. |
| 873 | report_array.push( |
| 874 | { name: old_info_node.info.function_name, info_not_found: true } ); |
| 875 | } |
| 876 | } |
| 877 | |
| 878 | // Adds a suffix to script name to mark that it is old version. |
| 879 | function CreateNameForOldScript(script) { |
| 880 | // TODO(635): try better than this; support several changes. |
| 881 | return script.name + " (old)"; |
| 882 | } |
| 883 | |
| 884 | // Compares a function scope heap structure, old and new version, whether it |
| 885 | // changed or not. Returns explanation if they differ. |
| 886 | function IsFunctionContextLocalsChanged(function_info1, function_info2) { |
| 887 | var scope_info1 = function_info1.scope_info; |
| 888 | var scope_info2 = function_info2.scope_info; |
| 889 | |
| 890 | var scope_info1_text; |
| 891 | var scope_info2_text; |
| 892 | |
| 893 | if (scope_info1) { |
| 894 | scope_info1_text = scope_info1.toString(); |
| 895 | } else { |
| 896 | scope_info1_text = ""; |
| 897 | } |
| 898 | if (scope_info2) { |
| 899 | scope_info2_text = scope_info2.toString(); |
| 900 | } else { |
| 901 | scope_info2_text = ""; |
| 902 | } |
| 903 | |
| 904 | if (scope_info1_text != scope_info2_text) { |
| 905 | return "Variable map changed: [" + scope_info1_text + |
| 906 | "] => [" + scope_info2_text + "]"; |
| 907 | } |
| 908 | // No differences. Return undefined. |
| 909 | return; |
| 910 | } |
| 911 | |
| 912 | // Minifier forward declaration. |
| 913 | var FunctionPatchabilityStatus; |
| 914 | |
| 915 | // For array of wrapped shared function infos checks that none of them |
| 916 | // have activations on stack (of any thread). Throws a Failure exception |
| 917 | // if this proves to be false. |
| 918 | function CheckStackActivations(old_shared_wrapper_list, |
| 919 | new_shared_list, |
| 920 | change_log) { |
| 921 | var old_shared_list = new GlobalArray(); |
| 922 | for (var i = 0; i < old_shared_wrapper_list.length; i++) { |
| 923 | old_shared_list[i] = old_shared_wrapper_list[i].info; |
| 924 | } |
| 925 | var result = %LiveEditCheckAndDropActivations( |
| 926 | old_shared_list, new_shared_list, true); |
| 927 | if (result[old_shared_wrapper_list.length]) { |
| 928 | // Extra array element may contain error message. |
| 929 | throw new Failure(result[old_shared_wrapper_list.length]); |
| 930 | } |
| 931 | |
| 932 | var problems = new GlobalArray(); |
| 933 | var dropped = new GlobalArray(); |
| 934 | for (var i = 0; i < old_shared_list.length; i++) { |
| 935 | var shared = old_shared_wrapper_list[i]; |
| 936 | if (result[i] == FunctionPatchabilityStatus.REPLACED_ON_ACTIVE_STACK) { |
| 937 | dropped.push({ name: shared.function_name } ); |
| 938 | } else if (result[i] != FunctionPatchabilityStatus.AVAILABLE_FOR_PATCH) { |
| 939 | var description = { |
| 940 | name: shared.function_name, |
| 941 | start_pos: shared.start_position, |
| 942 | end_pos: shared.end_position, |
| 943 | replace_problem: |
| 944 | FunctionPatchabilityStatus.SymbolName(result[i]) |
| 945 | }; |
| 946 | problems.push(description); |
| 947 | } |
| 948 | } |
| 949 | if (dropped.length > 0) { |
| 950 | change_log.push({ dropped_from_stack: dropped }); |
| 951 | } |
| 952 | if (problems.length > 0) { |
| 953 | change_log.push( { functions_on_stack: problems } ); |
| 954 | throw new Failure("Blocked by functions on stack"); |
| 955 | } |
| 956 | |
| 957 | return dropped.length; |
| 958 | } |
| 959 | |
| 960 | // A copy of the FunctionPatchabilityStatus enum from liveedit.h |
| 961 | var FunctionPatchabilityStatus = { |
| 962 | AVAILABLE_FOR_PATCH: 1, |
| 963 | BLOCKED_ON_ACTIVE_STACK: 2, |
| 964 | BLOCKED_ON_OTHER_STACK: 3, |
| 965 | BLOCKED_UNDER_NATIVE_CODE: 4, |
| 966 | REPLACED_ON_ACTIVE_STACK: 5, |
| 967 | BLOCKED_UNDER_GENERATOR: 6, |
| 968 | BLOCKED_ACTIVE_GENERATOR: 7, |
| 969 | BLOCKED_NO_NEW_TARGET_ON_RESTART: 8 |
| 970 | }; |
| 971 | |
| 972 | FunctionPatchabilityStatus.SymbolName = function(code) { |
| 973 | var enumeration = FunctionPatchabilityStatus; |
| 974 | for (var name in enumeration) { |
| 975 | if (enumeration[name] == code) { |
| 976 | return name; |
| 977 | } |
| 978 | } |
| 979 | }; |
| 980 | |
| 981 | |
| 982 | // A logical failure in liveedit process. This means that change_log |
| 983 | // is valid and consistent description of what happened. |
| 984 | function Failure(message) { |
| 985 | this.message = message; |
| 986 | } |
| 987 | |
| 988 | Failure.prototype.toString = function() { |
| 989 | return "LiveEdit Failure: " + this.message; |
| 990 | }; |
| 991 | |
| 992 | function CopyErrorPositionToDetails(e, details) { |
| 993 | function createPositionStruct(script, position) { |
| 994 | if (position == -1) return; |
| 995 | var location = script.locationFromPosition(position, true); |
| 996 | if (location == null) return; |
| 997 | return { |
| 998 | line: location.line + 1, |
| 999 | column: location.column + 1, |
| 1000 | position: position |
| 1001 | }; |
| 1002 | } |
| 1003 | |
| 1004 | if (!("scriptObject" in e) || !("startPosition" in e)) { |
| 1005 | return; |
| 1006 | } |
| 1007 | |
| 1008 | var script = e.scriptObject; |
| 1009 | |
| 1010 | var position_struct = { |
| 1011 | start: createPositionStruct(script, e.startPosition), |
| 1012 | end: createPositionStruct(script, e.endPosition) |
| 1013 | }; |
| 1014 | details.position = position_struct; |
| 1015 | } |
| 1016 | |
| 1017 | // A testing entry. |
| 1018 | function GetPcFromSourcePos(func, source_pos) { |
| 1019 | return %GetFunctionCodePositionFromSource(func, source_pos); |
| 1020 | } |
| 1021 | |
| 1022 | // LiveEdit main entry point: changes a script text to a new string. |
| 1023 | function SetScriptSource(script, new_source, preview_only, change_log) { |
| 1024 | var old_source = script.source; |
| 1025 | var diff = CompareStrings(old_source, new_source); |
| 1026 | return ApplyPatchMultiChunk(script, diff, new_source, preview_only, |
| 1027 | change_log); |
| 1028 | } |
| 1029 | |
| 1030 | function CompareStrings(s1, s2) { |
| 1031 | return %LiveEditCompareStrings(s1, s2); |
| 1032 | } |
| 1033 | |
| 1034 | // Applies the change to the script. |
| 1035 | // The change is always a substring (change_pos, change_pos + change_len) |
| 1036 | // being replaced with a completely different string new_str. |
| 1037 | // This API is a legacy and is obsolete. |
| 1038 | // |
| 1039 | // @param {Script} script that is being changed |
| 1040 | // @param {Array} change_log a list that collects engineer-readable |
| 1041 | // description of what happened. |
| 1042 | function ApplySingleChunkPatch(script, change_pos, change_len, new_str, |
| 1043 | change_log) { |
| 1044 | var old_source = script.source; |
| 1045 | |
| 1046 | // Prepare new source string. |
| 1047 | var new_source = old_source.substring(0, change_pos) + |
| 1048 | new_str + old_source.substring(change_pos + change_len); |
| 1049 | |
| 1050 | return ApplyPatchMultiChunk(script, |
| 1051 | [ change_pos, change_pos + change_len, change_pos + new_str.length], |
| 1052 | new_source, false, change_log); |
| 1053 | } |
| 1054 | |
| 1055 | // Creates JSON description for a change tree. |
| 1056 | function DescribeChangeTree(old_code_tree) { |
| 1057 | |
| 1058 | function ProcessOldNode(node) { |
| 1059 | var child_infos = []; |
| 1060 | for (var i = 0; i < node.children.length; i++) { |
| 1061 | var child = node.children[i]; |
| 1062 | if (child.status != FunctionStatus.UNCHANGED) { |
| 1063 | child_infos.push(ProcessOldNode(child)); |
| 1064 | } |
| 1065 | } |
| 1066 | var new_child_infos = []; |
| 1067 | if (node.textually_unmatched_new_nodes) { |
| 1068 | for (var i = 0; i < node.textually_unmatched_new_nodes.length; i++) { |
| 1069 | var child = node.textually_unmatched_new_nodes[i]; |
| 1070 | new_child_infos.push(ProcessNewNode(child)); |
| 1071 | } |
| 1072 | } |
| 1073 | var res = { |
| 1074 | name: node.info.function_name, |
| 1075 | positions: DescribePositions(node), |
| 1076 | status: node.status, |
| 1077 | children: child_infos, |
| 1078 | new_children: new_child_infos |
| 1079 | }; |
| 1080 | if (node.status_explanation) { |
| 1081 | res.status_explanation = node.status_explanation; |
| 1082 | } |
| 1083 | if (node.textual_corresponding_node) { |
| 1084 | res.new_positions = DescribePositions(node.textual_corresponding_node); |
| 1085 | } |
| 1086 | return res; |
| 1087 | } |
| 1088 | |
| 1089 | function ProcessNewNode(node) { |
| 1090 | var child_infos = []; |
| 1091 | // Do not list ancestors. |
| 1092 | if (false) { |
| 1093 | for (var i = 0; i < node.children.length; i++) { |
| 1094 | child_infos.push(ProcessNewNode(node.children[i])); |
| 1095 | } |
| 1096 | } |
| 1097 | var res = { |
| 1098 | name: node.info.function_name, |
| 1099 | positions: DescribePositions(node), |
| 1100 | children: child_infos, |
| 1101 | }; |
| 1102 | return res; |
| 1103 | } |
| 1104 | |
| 1105 | function DescribePositions(node) { |
| 1106 | return { |
| 1107 | start_position: node.info.start_position, |
| 1108 | end_position: node.info.end_position |
| 1109 | }; |
| 1110 | } |
| 1111 | |
| 1112 | return ProcessOldNode(old_code_tree); |
| 1113 | } |
| 1114 | |
| 1115 | // ------------------------------------------------------------------- |
| 1116 | // Exports |
| 1117 | |
| 1118 | var LiveEdit = {}; |
| 1119 | LiveEdit.SetScriptSource = SetScriptSource; |
| 1120 | LiveEdit.ApplyPatchMultiChunk = ApplyPatchMultiChunk; |
| 1121 | LiveEdit.Failure = Failure; |
| 1122 | LiveEdit.GetPcFromSourcePos = GetPcFromSourcePos; |
| 1123 | |
| 1124 | LiveEdit.TestApi = { |
| 1125 | PosTranslator: PosTranslator, |
| 1126 | CompareStrings: CompareStrings, |
| 1127 | ApplySingleChunkPatch: ApplySingleChunkPatch |
| 1128 | }; |
| 1129 | |
| 1130 | global.Debug.LiveEdit = LiveEdit; |
| 1131 | |
| 1132 | }) |