v8/test/mjsunit/debug-scopes.js

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// Copyright 2008 the V8 project authors. All rights reserved.
// Redistribution and use in source and binary forms, with or without
// modification, are permitted provided that the following conditions are
// met:
//
// * Redistributions of source code must retain the above copyright
// notice, this list of conditions and the following disclaimer.
// * Redistributions in binary form must reproduce the above
// copyright notice, this list of conditions and the following
// disclaimer in the documentation and/or other materials provided
// with the distribution.
// * Neither the name of Google Inc. nor the names of its
// contributors may be used to endorse or promote products derived
// from this software without specific prior written permission.
//
// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
// "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
// LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
// A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
// OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
// SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
// LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
// DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
// THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
// (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
// OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
// Flags: --expose-debug-as debug
// The functions used for testing backtraces. They are at the top to make the
// testing of source line/column easier.
// Get the Debug object exposed from the debug context global object.
Debug = debug.Debug
var name;
var listener_delegate;
var listener_called;
var exception;
var begin_test_count = 0;
var end_test_count = 0;
var break_count = 0;
// Debug event listener which delegates.
function listener(event, exec_state, event_data, data) {
try {
if (event == Debug.DebugEvent.Break) {
break_count++;
listener_called = true;
listener_delegate(exec_state)
}
} catch (e) {
exception = e;
}
}
// Add the debug event listener.
Debug.setListener(listener);
// Initialize for a noew test.
function BeginTest(name) {
test_name = name;
listener_delegate = null;
listener_called = false;
exception = null;
begin_test_count++;
}
// Check result of a test.
function EndTest() {
assertTrue(listener_called, "listerner not called for " + test_name);
assertNull(exception, test_name)
end_test_count++;
}
// Check that the scope chain contains the expected types of scopes.
function CheckScopeChain(scopes, exec_state) {
assertEquals(scopes.length, exec_state.frame().scopeCount());
for (var i = 0; i < scopes.length; i++) {
var scope = exec_state.frame().scope(i);
assertTrue(scope.isScope());
assertEquals(scopes[i], scope.scopeType());
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// Check the global object when hitting the global scope.
if (scopes[i] == debug.ScopeType.Global) {
assertEquals(this, scope.scopeObject().value());
}
}
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// Get the debug command processor.
var dcp = exec_state.debugCommandProcessor("unspecified_running_state");
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// Send a scopes request and check the result.
var json;
request_json = '{"seq":0,"type":"request","command":"scopes"}'
var response_json = dcp.processDebugJSONRequest(request_json);
var response = JSON.parse(response_json);
assertEquals(scopes.length, response.body.scopes.length);
for (var i = 0; i < scopes.length; i++) {
assertEquals(i, response.body.scopes[i].index);
assertEquals(scopes[i], response.body.scopes[i].type);
if (scopes[i] == debug.ScopeType.Local ||
scopes[i] == debug.ScopeType.Closure) {
assertTrue(response.body.scopes[i].object.ref < 0);
} else {
assertTrue(response.body.scopes[i].object.ref >= 0);
}
var found = false;
for (var j = 0; j < response.refs.length && !found; j++) {
found = response.refs[j].handle == response.body.scopes[i].object.ref;
}
assertTrue(found, "Scope object " + response.body.scopes[i].object.ref + " not found");
}
}
// Check that the content of the scope is as expected. For functions just check
// that there is a function.
function CheckScopeContent(content, number, exec_state) {
var scope = exec_state.frame().scope(number)
var count = 0;
for (var p in content) {
var property_mirror = scope.scopeObject().property(p);
assertFalse(property_mirror.isUndefined(), 'property ' + p + ' not found in scope');
if (typeof(content[p]) === 'function') {
assertTrue(property_mirror.value().isFunction());
} else {
assertEquals(content[p], property_mirror.value().value(), 'property ' + p + ' has unexpected value');
}
count++;
}
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// 'arguments' and might be exposed in the local and closure scope. Just
// ignore this.
var scope_size = scope.scopeObject().properties().length;
if (!scope.scopeObject().property('arguments').isUndefined()) {
scope_size--;
}
// Also ignore synthetic variable from catch block.
if (!scope.scopeObject().property('.catch-var').isUndefined()) {
scope_size--;
}
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if (count != scope_size) {
print('Names found in scope:');
var names = scope.scopeObject().propertyNames();
for (var i = 0; i < names.length; i++) {
print(names[i]);
}
}
assertEquals(count, scope_size);
// Get the debug command processor.
var dcp = exec_state.debugCommandProcessor("unspecified_running_state");
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// Send a scope request for information on a single scope and check the
// result.
request_json = '{"seq":0,"type":"request","command":"scope","arguments":{"number":'
request_json += scope.scopeIndex();
request_json += '}}'
var response_json = dcp.processDebugJSONRequest(request_json);
var response = JSON.parse(response_json);
assertEquals(scope.scopeType(), response.body.type);
assertEquals(number, response.body.index);
if (scope.scopeType() == debug.ScopeType.Local ||
scope.scopeType() == debug.ScopeType.Closure) {
assertTrue(response.body.object.ref < 0);
} else {
assertTrue(response.body.object.ref >= 0);
}
var found = false;
for (var i = 0; i < response.refs.length && !found; i++) {
found = response.refs[i].handle == response.body.object.ref;
}
assertTrue(found, "Scope object " + response.body.object.ref + " not found");
}
// Simple empty local scope.
BeginTest("Local 1");
function local_1() {
debugger;
}
listener_delegate = function(exec_state) {
CheckScopeChain([debug.ScopeType.Local,
debug.ScopeType.Global], exec_state);
CheckScopeContent({}, 0, exec_state);
}
local_1()
EndTest();
// Local scope with a parameter.
BeginTest("Local 2");
function local_2(a) {
debugger;
}
listener_delegate = function(exec_state) {
CheckScopeChain([debug.ScopeType.Local,
debug.ScopeType.Global], exec_state);
CheckScopeContent({a:1}, 0, exec_state);
}
local_2(1)
EndTest();
// Local scope with a parameter and a local variable.
BeginTest("Local 3");
function local_3(a) {
var x = 3;
debugger;
}
listener_delegate = function(exec_state) {
CheckScopeChain([debug.ScopeType.Local,
debug.ScopeType.Global], exec_state);
CheckScopeContent({a:1,x:3}, 0, exec_state);
}
local_3(1)
EndTest();
// Local scope with parameters and local variables.
BeginTest("Local 4");
function local_4(a, b) {
var x = 3;
var y = 4;
debugger;
}
listener_delegate = function(exec_state) {
CheckScopeChain([debug.ScopeType.Local,
debug.ScopeType.Global], exec_state);
CheckScopeContent({a:1,b:2,x:3,y:4}, 0, exec_state);
}
local_4(1, 2)
EndTest();
// Empty local scope with use of eval.
BeginTest("Local 5");
function local_5() {
eval('');
debugger;
}
listener_delegate = function(exec_state) {
CheckScopeChain([debug.ScopeType.Local,
debug.ScopeType.Global], exec_state);
CheckScopeContent({}, 0, exec_state);
}
local_5()
EndTest();
// Local introducing local variable using eval.
BeginTest("Local 6");
function local_6() {
eval('var i = 5');
debugger;
}
listener_delegate = function(exec_state) {
CheckScopeChain([debug.ScopeType.Local,
debug.ScopeType.Global], exec_state);
CheckScopeContent({i:5}, 0, exec_state);
}
local_6()
EndTest();
// Local scope with parameters, local variables and local variable introduced
// using eval.
BeginTest("Local 7");
function local_7(a, b) {
var x = 3;
var y = 4;
eval('var i = 5');
eval('var j = 6');
debugger;
}
listener_delegate = function(exec_state) {
CheckScopeChain([debug.ScopeType.Local,
debug.ScopeType.Global], exec_state);
CheckScopeContent({a:1,b:2,x:3,y:4,i:5,j:6}, 0, exec_state);
}
local_7(1, 2)
EndTest();
// Single empty with block.
BeginTest("With 1");
function with_1() {
with({}) {
debugger;
}
}
listener_delegate = function(exec_state) {
CheckScopeChain([debug.ScopeType.With,
debug.ScopeType.Local,
debug.ScopeType.Global], exec_state);
CheckScopeContent({}, 0, exec_state);
}
with_1()
EndTest();
// Nested empty with blocks.
BeginTest("With 2");
function with_2() {
with({}) {
with({}) {
debugger;
}
}
}
listener_delegate = function(exec_state) {
CheckScopeChain([debug.ScopeType.With,
debug.ScopeType.With,
debug.ScopeType.Local,
debug.ScopeType.Global], exec_state);
CheckScopeContent({}, 0, exec_state);
CheckScopeContent({}, 1, exec_state);
}
with_2()
EndTest();
// With block using an in-place object literal.
BeginTest("With 3");
function with_3() {
with({a:1,b:2}) {
debugger;
}
}
listener_delegate = function(exec_state) {
CheckScopeChain([debug.ScopeType.With,
debug.ScopeType.Local,
debug.ScopeType.Global], exec_state);
CheckScopeContent({a:1,b:2}, 0, exec_state);
}
with_3()
EndTest();
// Nested with blocks using in-place object literals.
BeginTest("With 4");
function with_4() {
with({a:1,b:2}) {
with({a:2,b:1}) {
debugger;
}
}
}
listener_delegate = function(exec_state) {
CheckScopeChain([debug.ScopeType.With,
debug.ScopeType.With,
debug.ScopeType.Local,
debug.ScopeType.Global], exec_state);
CheckScopeContent({a:2,b:1}, 0, exec_state);
CheckScopeContent({a:1,b:2}, 1, exec_state);
}
with_4()
EndTest();
// Nested with blocks using existing object.
BeginTest("With 5");
var with_object = {c:3,d:4};
function with_5() {
with(with_object) {
with(with_object) {
debugger;
}
}
}
listener_delegate = function(exec_state) {
CheckScopeChain([debug.ScopeType.With,
debug.ScopeType.With,
debug.ScopeType.Local,
debug.ScopeType.Global], exec_state);
CheckScopeContent(with_object, 0, exec_state);
CheckScopeContent(with_object, 1, exec_state);
assertEquals(exec_state.frame().scope(0).scopeObject(), exec_state.frame().scope(1).scopeObject());
assertEquals(with_object, exec_state.frame().scope(1).scopeObject().value());
}
with_5()
EndTest();
// Simple closure formed by returning an inner function referering the outer
// functions arguments.
BeginTest("Closure 1");
function closure_1(a) {
function f() {
debugger;
return a;
};
return f;
}
listener_delegate = function(exec_state) {
CheckScopeChain([debug.ScopeType.Local,
debug.ScopeType.Closure,
debug.ScopeType.Global], exec_state);
CheckScopeContent({a:1}, 1, exec_state);
}
closure_1(1)()
EndTest();
// Simple closure formed by returning an inner function referering the outer
// functions arguments. Due to VM optimizations parts of the actual closure is
// missing from the debugger information.
BeginTest("Closure 2");
function closure_2(a, b) {
var x = a + 2;
var y = b + 2;
function f() {
debugger;
return a + x;
};
return f;
}
listener_delegate = function(exec_state) {
CheckScopeChain([debug.ScopeType.Local,
debug.ScopeType.Closure,
debug.ScopeType.Global], exec_state);
CheckScopeContent({a:1,x:3}, 1, exec_state);
}
closure_2(1, 2)()
EndTest();
// Simple closure formed by returning an inner function referering the outer
// functions arguments. Using all arguments and locals from the outer function
// in the inner function makes these part of the debugger information on the
// closure.
BeginTest("Closure 3");
function closure_3(a, b) {
var x = a + 2;
var y = b + 2;
function f() {
debugger;
return a + b + x + y;
};
return f;
}
listener_delegate = function(exec_state) {
CheckScopeChain([debug.ScopeType.Local,
debug.ScopeType.Closure,
debug.ScopeType.Global], exec_state);
CheckScopeContent({a:1,b:2,x:3,y:4}, 1, exec_state);
}
closure_3(1, 2)()
EndTest();
// Simple closure formed by returning an inner function referering the outer
// functions arguments. Using all arguments and locals from the outer function
// in the inner function makes these part of the debugger information on the
// closure. Use the inner function as well...
BeginTest("Closure 4");
function closure_4(a, b) {
var x = a + 2;
var y = b + 2;
function f() {
debugger;
if (f) {
return a + b + x + y;
}
};
return f;
}
listener_delegate = function(exec_state) {
CheckScopeChain([debug.ScopeType.Local,
debug.ScopeType.Closure,
debug.ScopeType.Global], exec_state);
CheckScopeContent({a:1,b:2,x:3,y:4,f:function(){}}, 1, exec_state);
}
closure_4(1, 2)()
EndTest();
// Simple closure formed by returning an inner function referering the outer
// functions arguments. In the presence of eval all arguments and locals
// (including the inner function itself) from the outer function becomes part of
// the debugger infformation on the closure.
BeginTest("Closure 5");
function closure_5(a, b) {
var x = 3;
var y = 4;
function f() {
eval('');
debugger;
return 1;
};
return f;
}
listener_delegate = function(exec_state) {
CheckScopeChain([debug.ScopeType.Local,
debug.ScopeType.Closure,
debug.ScopeType.Global], exec_state);
CheckScopeContent({a:1,b:2,x:3,y:4,f:function(){}}, 1, exec_state);
}
closure_5(1, 2)()
EndTest();
// Two closures. Due to optimizations only the parts actually used are provided
// through the debugger information.
BeginTest("Closure 6");
function closure_6(a, b) {
function f(a, b) {
var x = 3;
var y = 4;
return function() {
var x = 3;
var y = 4;
debugger;
some_global = a;
return f;
}
}
return f(a, b);
}
listener_delegate = function(exec_state) {
CheckScopeChain([debug.ScopeType.Local,
debug.ScopeType.Closure,
debug.ScopeType.Closure,
debug.ScopeType.Global], exec_state);
CheckScopeContent({a:1}, 1, exec_state);
CheckScopeContent({f:function(){}}, 2, exec_state);
}
closure_6(1, 2)()
EndTest();
// Two closures. In the presence of eval all information is provided as the
// compiler cannot determine which parts are used.
BeginTest("Closure 7");
function closure_7(a, b) {
var x = 3;
var y = 4;
eval('var i = 5');
eval('var j = 6');
function f(a, b) {
var x = 3;
var y = 4;
eval('var i = 5');
eval('var j = 6');
return function() {
debugger;
some_global = a;
return f;
}
}
return f(a, b);
}
listener_delegate = function(exec_state) {
CheckScopeChain([debug.ScopeType.Local,
debug.ScopeType.Closure,
debug.ScopeType.Closure,
debug.ScopeType.Global], exec_state);
CheckScopeContent({}, 0, exec_state);
CheckScopeContent({a:1,b:2,x:3,y:4,i:5,j:6}, 1, exec_state);
CheckScopeContent({a:1,b:2,x:3,y:4,i:5,j:6,f:function(){}}, 2, exec_state);
}
closure_7(1, 2)()
EndTest();
// Test a mixture of scopes.
BeginTest("The full monty");
function the_full_monty(a, b) {
var x = 3;
var y = 4;
eval('var i = 5');
eval('var j = 6');
function f(a, b) {
var x = 9;
var y = 10;
eval('var i = 11');
eval('var j = 12');
with ({j:13}){
return function() {
var x = 14;
with ({a:15}) {
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with ({b:16}) {
debugger;
some_global = a;
return f;
}
}
}
}
}
return f(a, b);
}
listener_delegate = function(exec_state) {
CheckScopeChain([debug.ScopeType.With,
debug.ScopeType.With,
debug.ScopeType.Local,
debug.ScopeType.With,
debug.ScopeType.Closure,
debug.ScopeType.Closure,
debug.ScopeType.Global], exec_state);
CheckScopeContent({b:16}, 0, exec_state);
CheckScopeContent({a:15}, 1, exec_state);
CheckScopeContent({x:14}, 2, exec_state);
CheckScopeContent({j:13}, 3, exec_state);
CheckScopeContent({a:1,b:2,x:9,y:10,i:11,j:12}, 4, exec_state);
CheckScopeContent({a:1,b:2,x:3,y:4,i:5,j:6,f:function(){}}, 5, exec_state);
}
the_full_monty(1, 2)()
EndTest();
// Test global scope.
BeginTest("Global");
listener_delegate = function(exec_state) {
CheckScopeChain([debug.ScopeType.Global], exec_state);
}
debugger;
EndTest();
BeginTest("Catch block 1");
function catch_block_1() {
try {
throw 'Exception';
} catch (e) {
debugger;
}
};
listener_delegate = function(exec_state) {
CheckScopeChain([debug.ScopeType.Catch,
debug.ScopeType.Local,
debug.ScopeType.Global], exec_state);
CheckScopeContent({e:'Exception'}, 0, exec_state);
}
catch_block_1()
EndTest();
BeginTest("Catch block 2");
function catch_block_2() {
try {
throw 'Exception';
} catch (e) {
with({n:10}) {
debugger;
}
}
};
listener_delegate = function(exec_state) {
CheckScopeChain([debug.ScopeType.With,
debug.ScopeType.Catch,
debug.ScopeType.Local,
debug.ScopeType.Global], exec_state);
CheckScopeContent({n:10}, 0, exec_state);
CheckScopeContent({e:'Exception'}, 1, exec_state);
}
catch_block_2()
EndTest();
BeginTest("Catch block 3");
function catch_block_3() {
// Do eval to dynamically declare a local variable so that the context's
// extension slot is initialized with JSContextExtensionObject.
eval("var y = 78;");
try {
throw 'Exception';
} catch (e) {
debugger;
}
};
listener_delegate = function(exec_state) {
CheckScopeChain([debug.ScopeType.Catch,
debug.ScopeType.Local,
debug.ScopeType.Global], exec_state);
CheckScopeContent({e:'Exception'}, 0, exec_state);
CheckScopeContent({y:78}, 1, exec_state);
}
catch_block_3()
EndTest();
BeginTest("Catch block 4");
function catch_block_4() {
// Do eval to dynamically declare a local variable so that the context's
// extension slot is initialized with JSContextExtensionObject.
eval("var y = 98;");
try {
throw 'Exception';
} catch (e) {
with({n:10}) {
debugger;
}
}
};
listener_delegate = function(exec_state) {
CheckScopeChain([debug.ScopeType.With,
debug.ScopeType.Catch,
debug.ScopeType.Local,
debug.ScopeType.Global], exec_state);
CheckScopeContent({n:10}, 0, exec_state);
CheckScopeContent({e:'Exception'}, 1, exec_state);
CheckScopeContent({y:98}, 2, exec_state);
}
catch_block_4()
EndTest();
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assertEquals(begin_test_count, break_count, 'one or more tests did not enter the debugger');
assertEquals(begin_test_count, end_test_count, 'one or more tests did not have its result checked');