7c468e53c4
BUG=1013 TEST= Review URL: http://codereview.chromium.org/6017008 git-svn-id: http://v8.googlecode.com/svn/branches/bleeding_edge@6274 ce2b1a6d-e550-0410-aec6-3dcde31c8c00
175 lines
7.0 KiB
C++
175 lines
7.0 KiB
C++
// 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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#ifndef V8_LIVEEDIT_H_
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#define V8_LIVEEDIT_H_
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// Live Edit feature implementation.
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// User should be able to change script on already running VM. This feature
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// matches hot swap features in other frameworks.
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//
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// The basic use-case is when user spots some mistake in function body
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// from debugger and wishes to change the algorithm without restart.
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//
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// A single change always has a form of a simple replacement (in pseudo-code):
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// script.source[positions, positions+length] = new_string;
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// Implementation first determines, which function's body includes this
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// change area. Then both old and new versions of script are fully compiled
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// in order to analyze, whether the function changed its outer scope
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// expectations (or number of parameters). If it didn't, function's code is
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// patched with a newly compiled code. If it did change, enclosing function
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// gets patched. All inner functions are left untouched, whatever happened
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// to them in a new script version. However, new version of code will
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// instantiate newly compiled functions.
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#include "compiler.h"
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namespace v8 {
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namespace internal {
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// This class collects some specific information on structure of functions
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// in a particular script. It gets called from compiler all the time, but
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// actually records any data only when liveedit operation is in process;
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// in any other time this class is very cheap.
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//
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// The primary interest of the Tracker is to record function scope structures
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// in order to analyze whether function code maybe safely patched (with new
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// code successfully reading existing data from function scopes). The Tracker
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// also collects compiled function codes.
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class LiveEditFunctionTracker {
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public:
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explicit LiveEditFunctionTracker(FunctionLiteral* fun);
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~LiveEditFunctionTracker();
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void RecordFunctionInfo(Handle<SharedFunctionInfo> info,
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FunctionLiteral* lit);
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void RecordRootFunctionInfo(Handle<Code> code);
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static bool IsActive();
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};
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#ifdef ENABLE_DEBUGGER_SUPPORT
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class LiveEdit : AllStatic {
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public:
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static JSArray* GatherCompileInfo(Handle<Script> script,
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Handle<String> source);
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static void WrapSharedFunctionInfos(Handle<JSArray> array);
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MUST_USE_RESULT static MaybeObject* ReplaceFunctionCode(
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Handle<JSArray> new_compile_info_array,
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Handle<JSArray> shared_info_array);
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static MaybeObject* FunctionSourceUpdated(Handle<JSArray> shared_info_array);
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// Updates script field in FunctionSharedInfo.
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static void SetFunctionScript(Handle<JSValue> function_wrapper,
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Handle<Object> script_handle);
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MUST_USE_RESULT static MaybeObject* PatchFunctionPositions(
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Handle<JSArray> shared_info_array, Handle<JSArray> position_change_array);
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// For a script updates its source field. If old_script_name is provided
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// (i.e. is a String), also creates a copy of the script with its original
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// source and sends notification to debugger.
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static Object* ChangeScriptSource(Handle<Script> original_script,
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Handle<String> new_source,
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Handle<Object> old_script_name);
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// In a code of a parent function replaces original function as embedded
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// object with a substitution one.
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static void ReplaceRefToNestedFunction(Handle<JSValue> parent_function_shared,
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Handle<JSValue> orig_function_shared,
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Handle<JSValue> subst_function_shared);
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// Checks listed functions on stack and return array with corresponding
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// FunctionPatchabilityStatus statuses; extra array element may
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// contain general error message. Modifies the current stack and
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// has restart the lowest found frames and drops all other frames above
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// if possible and if do_drop is true.
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static Handle<JSArray> CheckAndDropActivations(
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Handle<JSArray> shared_info_array, bool do_drop);
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// A copy of this is in liveedit-debugger.js.
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enum FunctionPatchabilityStatus {
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FUNCTION_AVAILABLE_FOR_PATCH = 1,
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FUNCTION_BLOCKED_ON_ACTIVE_STACK = 2,
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FUNCTION_BLOCKED_ON_OTHER_STACK = 3,
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FUNCTION_BLOCKED_UNDER_NATIVE_CODE = 4,
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FUNCTION_REPLACED_ON_ACTIVE_STACK = 5
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};
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// Compares 2 strings line-by-line, then token-wise and returns diff in form
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// of array of triplets (pos1, pos1_end, pos2_end) describing list
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// of diff chunks.
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static Handle<JSArray> CompareStrings(Handle<String> s1,
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Handle<String> s2);
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};
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// A general-purpose comparator between 2 arrays.
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class Comparator {
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public:
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// Holds 2 arrays of some elements allowing to compare any pair of
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// element from the first array and element from the second array.
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class Input {
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public:
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virtual int getLength1() = 0;
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virtual int getLength2() = 0;
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virtual bool equals(int index1, int index2) = 0;
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protected:
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virtual ~Input() {}
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};
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// Receives compare result as a series of chunks.
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class Output {
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public:
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// Puts another chunk in result list. Note that technically speaking
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// only 3 arguments actually needed with 4th being derivable.
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virtual void AddChunk(int pos1, int pos2, int len1, int len2) = 0;
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protected:
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virtual ~Output() {}
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};
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// Finds the difference between 2 arrays of elements.
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static void CalculateDifference(Input* input,
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Output* result_writer);
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};
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#endif // ENABLE_DEBUGGER_SUPPORT
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} } // namespace v8::internal
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#endif /* V*_LIVEEDIT_H_ */
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