mirror of https://github.com/lukechilds/node.git
Ryan Dahl
15 years ago
194 changed files with 10315 additions and 3224 deletions
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// Copyright 2010 the V8 project authors. All rights reserved.
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// Redistribution and use in source and binary forms, with or without
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// modification, are permitted provided that the following conditions are
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// met:
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//
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// * Redistributions of source code must retain the above copyright
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// notice, this list of conditions and the following disclaimer.
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// * Redistributions in binary form must reproduce the above
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// copyright notice, this list of conditions and the following
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// disclaimer in the documentation and/or other materials provided
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// with the distribution.
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// * Neither the name of Google Inc. nor the names of its
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// contributors may be used to endorse or promote products derived
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// from this software without specific prior written permission.
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//
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// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
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// "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
|
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// LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
|
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// A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
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// OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
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// SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
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// LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
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// DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
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// THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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// (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
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// OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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// LiveEdit feature implementation. The script should be executed after
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// debug-delay.js.
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// Changes script text and recompiles all relevant functions if possible.
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// The change is always a substring (change_pos, change_pos + change_len)
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// being replaced with a completely different string new_str.
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//
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// Only one function will have its Code changed in result of this function.
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// All nested functions (should they have any instances at the moment) are left
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// unchanged and re-linked to a newly created script instance representing old
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// version of the source. (Generally speaking,
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// during the change all nested functions are erased and completely different
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// set of nested functions are introduced.) All other functions just have
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// their positions updated.
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//
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// @param {Script} script that is being changed
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// @param {Array} change_log a list that collects engineer-readable description
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// of what happened.
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Debug.LiveEditChangeScript = function(script, change_pos, change_len, new_str, |
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change_log) { |
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// So far the function works as namespace.
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var liveedit = Debug.LiveEditChangeScript; |
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var Assert = liveedit.Assert; |
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// Fully compiles source string as a script. Returns Array of
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// FunctionCompileInfo -- a descriptions of all functions of the script.
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// Elements of array are ordered by start positions of functions (from top
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// to bottom) in the source. Fields outer_index and next_sibling_index help
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// to navigate the nesting structure of functions.
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//
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// The script is used for compilation, because it produces code that
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// needs to be linked with some particular script (for nested functions).
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function DebugGatherCompileInfo(source) { |
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// Get function info, elements are partially sorted (it is a tree
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// of nested functions serialized as parent followed by serialized children.
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var raw_compile_info = %LiveEditGatherCompileInfo(script, source); |
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// Sort function infos by start position field.
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var compile_info = new Array(); |
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var old_index_map = new Array(); |
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for (var i = 0; i < raw_compile_info.length; i++) { |
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compile_info.push(new liveedit.FunctionCompileInfo(raw_compile_info[i])); |
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old_index_map.push(i); |
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} |
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for (var i = 0; i < compile_info.length; i++) { |
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var k = i; |
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for (var j = i + 1; j < compile_info.length; j++) { |
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if (compile_info[k].start_position > compile_info[j].start_position) { |
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k = j; |
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} |
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} |
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if (k != i) { |
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var temp_info = compile_info[k]; |
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var temp_index = old_index_map[k]; |
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compile_info[k] = compile_info[i]; |
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old_index_map[k] = old_index_map[i]; |
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compile_info[i] = temp_info; |
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old_index_map[i] = temp_index; |
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} |
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} |
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// After sorting update outer_inder field using old_index_map. Also
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// set next_sibling_index field.
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var current_index = 0; |
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// The recursive function, that goes over all children of a particular
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// node (i.e. function info).
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function ResetIndexes(new_parent_index, old_parent_index) { |
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var previous_sibling = -1; |
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while (current_index < compile_info.length && |
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compile_info[current_index].outer_index == old_parent_index) { |
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var saved_index = current_index; |
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compile_info[saved_index].outer_index = new_parent_index; |
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if (previous_sibling != -1) { |
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compile_info[previous_sibling].next_sibling_index = saved_index; |
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} |
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previous_sibling = saved_index; |
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current_index++; |
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ResetIndexes(saved_index, old_index_map[saved_index]); |
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} |
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if (previous_sibling != -1) { |
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compile_info[previous_sibling].next_sibling_index = -1; |
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} |
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} |
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ResetIndexes(-1, -1); |
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Assert(current_index == compile_info.length); |
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return compile_info; |
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} |
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// Given a positions, finds a function that fully includes the entire change.
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function FindChangedFunction(compile_info, offset, len) { |
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// First condition: function should start before the change region.
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// Function #0 (whole-script function) always does, but we want
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// one, that is later in this list.
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var index = 0; |
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while (index + 1 < compile_info.length && |
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compile_info[index + 1].start_position <= offset) { |
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index++; |
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} |
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// Now we are at the last function that begins before the change
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// region. The function that covers entire change region is either
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// this function or the enclosing one.
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for (; compile_info[index].end_position < offset + len; |
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index = compile_info[index].outer_index) { |
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Assert(index != -1); |
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} |
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return index; |
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} |
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// Variable forward declarations. Preprocessor "Minifier" needs them.
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var old_compile_info; |
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var shared_infos; |
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// Finds SharedFunctionInfo that corresponds compile info with index
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// in old version of the script.
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function FindFunctionInfo(index) { |
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var old_info = old_compile_info[index]; |
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for (var i = 0; i < shared_infos.length; i++) { |
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var info = shared_infos[i]; |
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if (info.start_position == old_info.start_position && |
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info.end_position == old_info.end_position) { |
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return info; |
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} |
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} |
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} |
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// Replaces function's Code.
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function PatchCode(new_info, shared_info) { |
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%LiveEditReplaceFunctionCode(new_info.raw_array, shared_info.raw_array); |
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change_log.push( {function_patched: new_info.function_name} ); |
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} |
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var change_len_old; |
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var change_len_new; |
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// Translate position in old version of script into position in new
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// version of script.
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function PosTranslator(old_pos) { |
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if (old_pos <= change_pos) { |
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return old_pos; |
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} |
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if (old_pos >= change_pos + change_len_old) { |
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return old_pos + change_len_new - change_len_old; |
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} |
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return -1; |
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} |
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var position_change_array; |
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var position_patch_report; |
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function PatchPositions(new_info, shared_info) { |
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if (!shared_info) { |
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// TODO: explain what is happening.
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return; |
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} |
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%LiveEditPatchFunctionPositions(shared_info.raw_array, |
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position_change_array); |
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position_patch_report.push( { name: new_info.function_name } ); |
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} |
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var link_to_old_script_report; |
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var old_script; |
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// Makes a function associated with another instance of a script (the
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// one representing its old version). This way the function still
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// may access its own text.
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function LinkToOldScript(shared_info) { |
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%LiveEditRelinkFunctionToScript(shared_info.raw_array, old_script); |
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link_to_old_script_report.push( { name: shared_info.function_name } ); |
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} |
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var old_source = script.source; |
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var change_len_old = change_len; |
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var change_len_new = new_str.length; |
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// Prepare new source string.
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var new_source = old_source.substring(0, change_pos) + |
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new_str + old_source.substring(change_pos + change_len); |
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// Find all SharedFunctionInfo's that are compiled from this script.
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var shared_raw_list = %LiveEditFindSharedFunctionInfosForScript(script); |
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var shared_infos = new Array(); |
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for (var i = 0; i < shared_raw_list.length; i++) { |
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shared_infos.push(new liveedit.SharedInfoWrapper(shared_raw_list[i])); |
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} |
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// Gather compile information about old version of script.
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var old_compile_info = DebugGatherCompileInfo(old_source); |
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// Gather compile information about new version of script.
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var new_compile_info; |
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try { |
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new_compile_info = DebugGatherCompileInfo(new_source); |
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} catch (e) { |
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throw new liveedit.Failure("Failed to compile new version of script: " + e); |
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} |
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// An index of a single function, that is going to have its code replaced.
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var function_being_patched = |
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FindChangedFunction(old_compile_info, change_pos, change_len_old); |
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// In old and new script versions function with a change should have the
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// same indexes.
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var function_being_patched2 = |
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FindChangedFunction(new_compile_info, change_pos, change_len_new); |
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Assert(function_being_patched == function_being_patched2, |
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"inconsistent old/new compile info"); |
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// Check that function being patched has the same expectations in a new
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// version. Otherwise we cannot safely patch its behavior and should
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// choose the outer function instead.
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while (!liveedit.CompareFunctionExpectations( |
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old_compile_info[function_being_patched], |
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new_compile_info[function_being_patched])) { |
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Assert(old_compile_info[function_being_patched].outer_index == |
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new_compile_info[function_being_patched].outer_index); |
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function_being_patched = |
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old_compile_info[function_being_patched].outer_index; |
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Assert(function_being_patched != -1); |
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} |
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// Check that function being patched is not currently on stack.
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liveedit.CheckStackActivations( |
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[ FindFunctionInfo(function_being_patched) ], change_log ); |
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// Committing all changes.
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var old_script_name = liveedit.CreateNameForOldScript(script); |
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// Update the script text and create a new script representing an old
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// version of the script.
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var old_script = %LiveEditReplaceScript(script, new_source, old_script_name); |
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PatchCode(new_compile_info[function_being_patched], |
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FindFunctionInfo(function_being_patched)); |
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var position_patch_report = new Array(); |
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change_log.push( {position_patched: position_patch_report} ); |
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var position_change_array = [ change_pos, |
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change_pos + change_len_old, |
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change_pos + change_len_new ]; |
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// Update positions of all outer functions (i.e. all functions, that
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// are partially below the function being patched).
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for (var i = new_compile_info[function_being_patched].outer_index; |
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i != -1; |
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i = new_compile_info[i].outer_index) { |
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PatchPositions(new_compile_info[i], FindFunctionInfo(i)); |
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} |
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// Update positions of all functions that are fully below the function
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// being patched.
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var old_next_sibling = |
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old_compile_info[function_being_patched].next_sibling_index; |
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var new_next_sibling = |
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new_compile_info[function_being_patched].next_sibling_index; |
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// We simply go over the tail of both old and new lists. Their tails should
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// have an identical structure.
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if (old_next_sibling == -1) { |
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Assert(new_next_sibling == -1); |
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} else { |
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Assert(old_compile_info.length - old_next_sibling == |
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new_compile_info.length - new_next_sibling); |
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for (var i = old_next_sibling, j = new_next_sibling; |
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i < old_compile_info.length; i++, j++) { |
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PatchPositions(new_compile_info[j], FindFunctionInfo(i)); |
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} |
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} |
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var link_to_old_script_report = new Array(); |
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change_log.push( { linked_to_old_script: link_to_old_script_report } ); |
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// We need to link to old script all former nested functions.
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for (var i = function_being_patched + 1; i < old_next_sibling; i++) { |
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LinkToOldScript(FindFunctionInfo(i), old_script); |
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} |
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} |
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Debug.LiveEditChangeScript.Assert = function(condition, message) { |
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if (!condition) { |
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if (message) { |
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throw "Assert " + message; |
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} else { |
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throw "Assert"; |
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} |
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} |
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} |
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// An object describing function compilation details. Its index fields
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// apply to indexes inside array that stores these objects.
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Debug.LiveEditChangeScript.FunctionCompileInfo = function(raw_array) { |
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this.function_name = raw_array[0]; |
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this.start_position = raw_array[1]; |
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this.end_position = raw_array[2]; |
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this.param_num = raw_array[3]; |
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this.code = raw_array[4]; |
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this.scope_info = raw_array[5]; |
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this.outer_index = raw_array[6]; |
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this.next_sibling_index = null; |
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this.raw_array = raw_array; |
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} |
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// A structure describing SharedFunctionInfo.
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Debug.LiveEditChangeScript.SharedInfoWrapper = function(raw_array) { |
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this.function_name = raw_array[0]; |
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this.start_position = raw_array[1]; |
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this.end_position = raw_array[2]; |
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this.info = raw_array[3]; |
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this.raw_array = raw_array; |
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} |
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// Adds a suffix to script name to mark that it is old version.
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Debug.LiveEditChangeScript.CreateNameForOldScript = function(script) { |
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// TODO(635): try better than this; support several changes.
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return script.name + " (old)"; |
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} |
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// Compares a function interface old and new version, whether it
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// changed or not.
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Debug.LiveEditChangeScript.CompareFunctionExpectations = |
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function(function_info1, function_info2) { |
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// Check that function has the same number of parameters (there may exist
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// an adapter, that won't survive function parameter number change).
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if (function_info1.param_num != function_info2.param_num) { |
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return false; |
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} |
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var scope_info1 = function_info1.scope_info; |
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var scope_info2 = function_info2.scope_info; |
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if (!scope_info1) { |
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return !scope_info2; |
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} |
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if (scope_info1.length != scope_info2.length) { |
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return false; |
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} |
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// Check that outer scope structure is not changed. Otherwise the function
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// will not properly work with existing scopes.
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return scope_info1.toString() == scope_info2.toString(); |
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} |
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// For array of wrapped shared function infos checks that none of them
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// have activations on stack (of any thread). Throws a Failure exception
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// if this proves to be false.
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Debug.LiveEditChangeScript.CheckStackActivations = function(shared_wrapper_list, |
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change_log) { |
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var liveedit = Debug.LiveEditChangeScript; |
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var shared_list = new Array(); |
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for (var i = 0; i < shared_wrapper_list.length; i++) { |
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shared_list[i] = shared_wrapper_list[i].info; |
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} |
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var result = %LiveEditCheckStackActivations(shared_list); |
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var problems = new Array(); |
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for (var i = 0; i < shared_list.length; i++) { |
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if (result[i] == liveedit.FunctionPatchabilityStatus.FUNCTION_BLOCKED_ON_STACK) { |
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var shared = shared_list[i]; |
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var description = { |
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name: shared.function_name, |
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start_pos: shared.start_position, |
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end_pos: shared.end_position |
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}; |
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problems.push(description); |
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} |
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} |
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if (problems.length > 0) { |
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change_log.push( { functions_on_stack: problems } ); |
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throw new liveedit.Failure("Blocked by functions on stack"); |
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} |
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} |
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|
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// A copy of the FunctionPatchabilityStatus enum from liveedit.h
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Debug.LiveEditChangeScript.FunctionPatchabilityStatus = { |
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FUNCTION_AVAILABLE_FOR_PATCH: 0, |
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FUNCTION_BLOCKED_ON_STACK: 1 |
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} |
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// A logical failure in liveedit process. This means that change_log
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// is valid and consistent description of what happened.
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Debug.LiveEditChangeScript.Failure = function(message) { |
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this.message = message; |
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} |
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Debug.LiveEditChangeScript.Failure.prototype.toString = function() { |
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return "LiveEdit Failure: " + this.message; |
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} |
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