mirror of
https://github.com/denoland/deno.git
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300 lines
11 KiB
Rust
300 lines
11 KiB
Rust
// Copyright 2018-2020 the Deno authors. All rights reserved. MIT license.
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use crate::ErrBox;
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use rusty_v8 as v8;
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use std::convert::TryFrom;
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use std::convert::TryInto;
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use std::error::Error;
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use std::fmt;
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/// A `JSError` represents an exception coming from V8, with stack frames and
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/// line numbers. The deno_cli crate defines another `JSError` type, which wraps
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/// the one defined here, that adds source map support and colorful formatting.
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#[derive(Debug, PartialEq, Clone)]
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pub struct JSError {
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pub message: String,
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pub source_line: Option<String>,
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pub script_resource_name: Option<String>,
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pub line_number: Option<i64>,
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pub start_column: Option<i64>, // 0-based
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pub end_column: Option<i64>, // 0-based
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pub frames: Vec<JSStackFrame>,
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pub formatted_frames: Vec<String>,
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}
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#[derive(Debug, PartialEq, Clone)]
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pub struct JSStackFrame {
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pub type_name: Option<String>,
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pub function_name: Option<String>,
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pub method_name: Option<String>,
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pub file_name: Option<String>,
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pub line_number: Option<i64>,
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pub column_number: Option<i64>,
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pub eval_origin: Option<String>,
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pub is_top_level: Option<bool>,
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pub is_eval: bool,
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pub is_native: bool,
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pub is_constructor: bool,
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pub is_async: bool,
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pub is_promise_all: bool,
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pub promise_index: Option<i64>,
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}
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fn get_property<'a>(
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scope: &mut impl v8::ToLocal<'a>,
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context: v8::Local<v8::Context>,
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object: v8::Local<v8::Object>,
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key: &str,
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) -> Option<v8::Local<'a, v8::Value>> {
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let key = v8::String::new(scope, key).unwrap();
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object.get(scope, context, key.into())
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}
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impl JSError {
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pub(crate) fn create(js_error: Self) -> ErrBox {
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ErrBox::from(js_error)
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}
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pub fn from_v8_exception(
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scope: &mut impl v8::InIsolate,
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exception: v8::Local<v8::Value>,
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) -> Self {
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// Create a new HandleScope because we're creating a lot of new local
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// handles below.
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let mut hs = v8::HandleScope::new(scope);
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let scope = hs.enter();
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let context = { scope.get_current_context().unwrap() };
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let msg = v8::Exception::create_message(scope, exception);
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let (message, frames, formatted_frames) = if exception.is_native_error() {
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// The exception is a JS Error object.
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let exception: v8::Local<v8::Object> =
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exception.clone().try_into().unwrap();
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// Get the message by formatting error.name and error.message.
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let name = get_property(scope, context, exception, "name")
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.and_then(|m| m.to_string(scope))
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.map(|s| s.to_rust_string_lossy(scope))
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.unwrap_or_else(|| "undefined".to_string());
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let message_prop = get_property(scope, context, exception, "message")
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.and_then(|m| m.to_string(scope))
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.map(|s| s.to_rust_string_lossy(scope))
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.unwrap_or_else(|| "undefined".to_string());
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let message = format!("Uncaught {}: {}", name, message_prop);
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// Access error.stack to ensure that prepareStackTrace() has been called.
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// This should populate error.__callSiteEvals and error.__formattedFrames.
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let _ = get_property(scope, context, exception, "stack");
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// Read an array of structured frames from error.__callSiteEvals.
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let frames_v8 =
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get_property(scope, context, exception, "__callSiteEvals");
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let frames_v8: Option<v8::Local<v8::Array>> =
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frames_v8.and_then(|a| a.try_into().ok());
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// Read an array of pre-formatted frames from error.__formattedFrames.
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let formatted_frames_v8 =
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get_property(scope, context, exception, "__formattedFrames");
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let formatted_frames_v8: Option<v8::Local<v8::Array>> =
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formatted_frames_v8.and_then(|a| a.try_into().ok());
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// Convert them into Vec<JSStack> and Vec<String> respectively.
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let mut frames: Vec<JSStackFrame> = vec![];
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let mut formatted_frames: Vec<String> = vec![];
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if let (Some(frames_v8), Some(formatted_frames_v8)) =
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(frames_v8, formatted_frames_v8)
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{
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for i in 0..frames_v8.length() {
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let call_site: v8::Local<v8::Object> = frames_v8
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.get_index(scope, context, i)
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.unwrap()
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.try_into()
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.unwrap();
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let type_name: Option<v8::Local<v8::String>> =
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get_property(scope, context, call_site, "typeName")
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.unwrap()
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.try_into()
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.ok();
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let type_name = type_name.map(|s| s.to_rust_string_lossy(scope));
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let function_name: Option<v8::Local<v8::String>> =
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get_property(scope, context, call_site, "functionName")
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.unwrap()
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.try_into()
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.ok();
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let function_name =
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function_name.map(|s| s.to_rust_string_lossy(scope));
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let method_name: Option<v8::Local<v8::String>> =
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get_property(scope, context, call_site, "methodName")
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.unwrap()
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.try_into()
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.ok();
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let method_name = method_name.map(|s| s.to_rust_string_lossy(scope));
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let file_name: Option<v8::Local<v8::String>> =
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get_property(scope, context, call_site, "fileName")
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.unwrap()
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.try_into()
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.ok();
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let file_name = file_name.map(|s| s.to_rust_string_lossy(scope));
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let line_number: Option<v8::Local<v8::Integer>> =
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get_property(scope, context, call_site, "lineNumber")
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.unwrap()
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.try_into()
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.ok();
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let line_number = line_number.map(|n| n.value());
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let column_number: Option<v8::Local<v8::Integer>> =
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get_property(scope, context, call_site, "columnNumber")
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.unwrap()
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.try_into()
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.ok();
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let column_number = column_number.map(|n| n.value());
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let eval_origin: Option<v8::Local<v8::String>> =
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get_property(scope, context, call_site, "evalOrigin")
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.unwrap()
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.try_into()
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.ok();
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let eval_origin = eval_origin.map(|s| s.to_rust_string_lossy(scope));
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let is_top_level: Option<v8::Local<v8::Boolean>> =
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get_property(scope, context, call_site, "isTopLevel")
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.unwrap()
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.try_into()
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.ok();
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let is_top_level = is_top_level.map(|b| b.is_true());
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let is_eval: v8::Local<v8::Boolean> =
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get_property(scope, context, call_site, "isEval")
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.unwrap()
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.try_into()
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.unwrap();
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let is_eval = is_eval.is_true();
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let is_native: v8::Local<v8::Boolean> =
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get_property(scope, context, call_site, "isNative")
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.unwrap()
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.try_into()
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.unwrap();
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let is_native = is_native.is_true();
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let is_constructor: v8::Local<v8::Boolean> =
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get_property(scope, context, call_site, "isConstructor")
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.unwrap()
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.try_into()
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.unwrap();
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let is_constructor = is_constructor.is_true();
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let is_async: v8::Local<v8::Boolean> =
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get_property(scope, context, call_site, "isAsync")
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.unwrap()
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.try_into()
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.unwrap();
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let is_async = is_async.is_true();
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let is_promise_all: v8::Local<v8::Boolean> =
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get_property(scope, context, call_site, "isPromiseAll")
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.unwrap()
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.try_into()
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.unwrap();
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let is_promise_all = is_promise_all.is_true();
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let promise_index: Option<v8::Local<v8::Integer>> =
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get_property(scope, context, call_site, "columnNumber")
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.unwrap()
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.try_into()
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.ok();
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let promise_index = promise_index.map(|n| n.value());
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frames.push(JSStackFrame {
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type_name,
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function_name,
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method_name,
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file_name,
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line_number,
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column_number,
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eval_origin,
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is_top_level,
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is_eval,
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is_native,
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is_constructor,
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is_async,
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is_promise_all,
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promise_index,
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});
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let formatted_frame: v8::Local<v8::String> = formatted_frames_v8
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.get_index(scope, context, i)
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.unwrap()
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.try_into()
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.unwrap();
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let formatted_frame = formatted_frame.to_rust_string_lossy(scope);
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formatted_frames.push(formatted_frame)
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}
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}
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(message, frames, formatted_frames)
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} else {
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// The exception is not a JS Error object.
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// Get the message given by V8::Exception::create_message(), and provide
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// empty frames.
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(msg.get(scope).to_rust_string_lossy(scope), vec![], vec![])
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};
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Self {
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message,
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script_resource_name: msg
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.get_script_resource_name(scope)
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.and_then(|v| v8::Local::<v8::String>::try_from(v).ok())
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.map(|v| v.to_rust_string_lossy(scope)),
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source_line: msg
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.get_source_line(scope, context)
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.map(|v| v.to_rust_string_lossy(scope)),
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line_number: msg.get_line_number(context).and_then(|v| v.try_into().ok()),
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start_column: msg.get_start_column().try_into().ok(),
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end_column: msg.get_end_column().try_into().ok(),
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frames,
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formatted_frames,
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}
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}
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}
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impl Error for JSError {}
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fn format_source_loc(
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file_name: &str,
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line_number: i64,
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column_number: i64,
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) -> String {
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let line_number = line_number;
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let column_number = column_number;
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format!("{}:{}:{}", file_name, line_number, column_number)
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}
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impl fmt::Display for JSError {
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fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result {
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if let Some(script_resource_name) = &self.script_resource_name {
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if self.line_number.is_some() && self.start_column.is_some() {
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assert!(self.line_number.is_some());
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assert!(self.start_column.is_some());
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let source_loc = format_source_loc(
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script_resource_name,
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self.line_number.unwrap(),
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self.start_column.unwrap(),
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);
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write!(f, "{}", source_loc)?;
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}
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if self.source_line.is_some() {
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let source_line = self.source_line.as_ref().unwrap();
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write!(f, "\n{}\n", source_line)?;
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let mut s = String::new();
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for i in 0..self.end_column.unwrap() {
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if i >= self.start_column.unwrap() {
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s.push('^');
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} else if source_line.chars().nth(i as usize).unwrap() == '\t' {
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s.push('\t');
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} else {
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s.push(' ');
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}
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}
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writeln!(f, "{}", s)?;
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}
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}
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write!(f, "{}", self.message)?;
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for formatted_frame in &self.formatted_frames {
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// TODO: Strip ANSI color from formatted_frame.
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write!(f, "\n at {}", formatted_frame)?;
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}
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Ok(())
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}
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}
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