static char* FormatJSStackDump(JSContext* cx, char* buf, JSBool showArgs, JSBool showLocals, JSBool showThisProps) { JSStackFrame* fp; JSStackFrame* iter = nsnull; int num = 0; while (nsnull != (fp = JS_FrameIterator(cx, &iter))) { buf = FormatJSFrame(cx, fp, buf, num, showArgs, showLocals, showThisProps); num++; } if (!num) buf = JS_sprintf_append(buf, "JavaScript stack is empty\n"); return buf; }
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 = JS_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_GetFrameScopeChain(cx, 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 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; }