// Try to get the the document corresponding to the given JSStackFrame.
static already_AddRefed<nsIDocument>
GetFrameDocument(JSContext *cx, JSStackFrame *fp)
{
if (!cx || !fp)
return nsnull;
JSObject* scope = JS_GetGlobalForFrame(fp);
if (!scope)
return nsnull;
JSAutoEnterCompartment ac;
if (!ac.enter(cx, scope))
return nsnull;
nsCOMPtr<nsIDOMWindow> window =
do_QueryInterface(nsJSUtils::GetStaticScriptGlobal(cx, scope));
if (!window)
return nsnull;
// If it's a window, get its document.
nsCOMPtr<nsIDOMDocument> domDoc;
window->GetDocument(getter_AddRefs(domDoc));
nsCOMPtr<nsIDocument> doc = do_QueryInterface(domDoc);
return doc.forget();
}
static char* FormatJSFrame(JSContext* cx, JSStackFrame* fp,
char* buf, int num,
JSBool showArgs, JSBool showLocals, JSBool showThisProps)
{
JSPropertyDescArray callProps = {0, nsnull};
JSPropertyDescArray thisProps = {0, nsnull};
JSBool gotThisVal = false;
jsval thisVal;
JSObject* callObj = nsnull;
JSString* funname = nsnull;
JSAutoByteString funbytes;
const char* filename = nsnull;
PRInt32 lineno = 0;
JSFunction* fun = nsnull;
uint32 namedArgCount = 0;
jsval val;
JSBool isString;
// get the info for this stack frame
JSScript* script = JS_GetFrameScript(cx, fp);
jsbytecode* pc = JS_GetFramePC(cx, fp);
JSAutoRequest ar(cx);
JSAutoEnterCompartment ac;
if (!ac.enter(cx, JS_GetGlobalForFrame(fp)))
return buf;
if (script && pc) {
filename = JS_GetScriptFilename(cx, script);
lineno = (PRInt32) JS_PCToLineNumber(cx, script, pc);
fun = JS_GetFrameFunction(cx, fp);
if (fun)
funname = JS_GetFunctionId(fun);
if (showArgs || showLocals) {
callObj = JS_GetFrameCallObject(cx, fp);
if (callObj)
if (!JS_GetPropertyDescArray(cx, callObj, &callProps))
callProps.array = nsnull; // just to be sure
}
gotThisVal = JS_GetFrameThis(cx, fp, &thisVal);
if (!gotThisVal ||
!showThisProps ||
JSVAL_IS_PRIMITIVE(thisVal) ||
!JS_GetPropertyDescArray(cx, JSVAL_TO_OBJECT(thisVal),
&thisProps)) {
thisProps.array = nsnull; // just to be sure
}
}
// print the frame number and function name
if (funname)
buf = JS_sprintf_append(buf, "%d %s(", num, funbytes.encode(cx, funname));
else if (fun)
buf = JS_sprintf_append(buf, "%d anonymous(", num);
else
buf = JS_sprintf_append(buf, "%d <TOP LEVEL>", num);
if (!buf) goto out;
// print the function arguments
if (showArgs && callObj) {
for (uint32 i = 0; i < callProps.length; i++) {
JSPropertyDesc* desc = &callProps.array[i];
if (desc->flags & JSPD_ARGUMENT) {
JSAutoByteString nameBytes;
const char* name = JSVAL2String(cx, desc->id, &isString, &nameBytes);
if (!isString)
name = nsnull;
JSAutoByteString valueBytes;
const char* value = JSVAL2String(cx, desc->value, &isString, &valueBytes);
buf = JS_sprintf_append(buf, "%s%s%s%s%s%s",
namedArgCount ? ", " : "",
name ? name :"",
name ? " = " : "",
isString ? "\"" : "",
value ? value : "?unknown?",
isString ? "\"" : "");
if (!buf) goto out;
namedArgCount++;
}
}
// print any unnamed trailing args (found in 'arguments' object)
if (JS_GetProperty(cx, callObj, "arguments", &val) &&
JSVAL_IS_OBJECT(val)) {
uint32_t argCount;
JSObject* argsObj = JSVAL_TO_OBJECT(val);
if (JS_GetProperty(cx, argsObj, "length", &val) &&
JS_ValueToECMAUint32(cx, val, &argCount) &&
argCount > namedArgCount) {
for (uint32 k = namedArgCount; k < argCount; k++) {
char number[8];
JS_snprintf(number, 8, "%d", (int) k);
if (JS_GetProperty(cx, argsObj, number, &val)) {
JSAutoByteString valueBytes;
const char *value = JSVAL2String(cx, val, &isString, &valueBytes);
buf = JS_sprintf_append(buf, "%s%s%s%s",
k ? ", " : "",
isString ? "\"" : "",
value ? value : "?unknown?",
isString ? "\"" : "");
if (!buf) goto out;
}
}
}
}
}
// print filename and line number
buf = JS_sprintf_append(buf, "%s [\"%s\":%d]\n",
fun ? ")" : "",
filename ? filename : "<unknown>",
lineno);
if (!buf) goto out;
// print local variables
if (showLocals && callProps.array) {
for (uint32 i = 0; i < callProps.length; i++) {
JSPropertyDesc* desc = &callProps.array[i];
if (desc->flags & JSPD_VARIABLE) {
JSAutoByteString nameBytes;
JSAutoByteString valueBytes;
const char *name = JSVAL2String(cx, desc->id, nsnull, &nameBytes);
const char *value = JSVAL2String(cx, desc->value, &isString, &valueBytes);
if (name && value) {
buf = JS_sprintf_append(buf, TAB "%s = %s%s%s\n",
name,
isString ? "\"" : "",
value,
isString ? "\"" : "");
if (!buf) goto out;
}
}
}
}
// print the value of 'this'
if (showLocals) {
if (gotThisVal) {
JSString* thisValStr;
JSAutoByteString thisValBytes;
if (nsnull != (thisValStr = JS_ValueToString(cx, thisVal)) &&
thisValBytes.encode(cx, thisValStr)) {
buf = JS_sprintf_append(buf, TAB "this = %s\n", thisValBytes.ptr());
if (!buf) goto out;
}
} else
buf = JS_sprintf_append(buf, TAB "<failed to get 'this' value>\n");
}
// print the properties of 'this', if it is an object
if (showThisProps && thisProps.array) {
for (uint32 i = 0; i < thisProps.length; i++) {
JSPropertyDesc* desc = &thisProps.array[i];
if (desc->flags & JSPD_ENUMERATE) {
JSAutoByteString nameBytes;
JSAutoByteString valueBytes;
const char *name = JSVAL2String(cx, desc->id, nsnull, &nameBytes);
const char *value = JSVAL2String(cx, desc->value, &isString, &valueBytes);
if (name && value) {
buf = JS_sprintf_append(buf, TAB "this.%s = %s%s%s\n",
name,
isString ? "\"" : "",
value,
isString ? "\"" : "");
if (!buf) goto out;
}
}
}
}
out:
if (callProps.array)
JS_PutPropertyDescArray(cx, &callProps);
if (thisProps.array)
JS_PutPropertyDescArray(cx, &thisProps);
return buf;
}
