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https://github.com/denoland/deno.git
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230 lines
7.6 KiB
Rust
230 lines
7.6 KiB
Rust
// Copyright 2018-2020 the Deno authors. All rights reserved. MIT license.
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// Note that source_map_mappings requires 0-indexed line and column numbers but
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// V8 Exceptions are 1-indexed.
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// TODO: This currently only applies to uncaught exceptions. It would be nice to
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// also have source maps for situations like this:
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// const err = new Error("Boo!");
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// console.log(err.stack);
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// It would require calling into Rust from Error.prototype.prepareStackTrace.
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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>,
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pub end_column: Option<i64>,
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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 line_number: i64, // zero indexed
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pub column: i64, // zero indexed
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pub script_name: String,
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pub function_name: String,
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pub is_eval: bool,
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pub is_constructor: bool,
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pub is_async: bool,
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// TODO(nayeemrmn): Support more CallSite fields.
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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 exception: Option<v8::Local<v8::Object>> =
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exception.clone().try_into().ok();
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let _ = exception.map(|e| get_property(scope, context, e, "stack"));
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let maybe_call_sites = exception
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.and_then(|e| get_property(scope, context, e, "__callSiteEvals"));
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let maybe_call_sites: Option<v8::Local<v8::Array>> =
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maybe_call_sites.and_then(|a| a.try_into().ok());
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let (frames, formatted_frames) = if let Some(call_sites) = maybe_call_sites
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{
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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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let formatted_frames_v8 =
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get_property(scope, context, exception.unwrap(), "__formattedFrames");
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let formatted_frames_v8: v8::Local<v8::Array> = formatted_frames_v8
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.and_then(|a| a.try_into().ok())
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.expect("__formattedFrames should be defined if __callSiteEvals is.");
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for i in 0..call_sites.length() {
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let call_site: v8::Local<v8::Object> = call_sites
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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 line_number: 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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.unwrap();
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let line_number = line_number.value() - 1;
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let column_number: 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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.unwrap();
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let column_number = column_number.value() - 1;
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let file_name: Result<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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let file_name = file_name
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.map_or_else(|_| String::new(), |s| s.to_rust_string_lossy(scope));
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let function_name: Result<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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let function_name = function_name
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.map_or_else(|_| String::new(), |s| s.to_rust_string_lossy(scope));
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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_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_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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frames.push(JSStackFrame {
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line_number,
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column: column_number,
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script_name: file_name,
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function_name,
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is_constructor,
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is_eval,
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is_async,
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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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(frames, formatted_frames)
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} else {
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(vec![], vec![])
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};
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Self {
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message: msg.get(scope).to_rust_string_lossy(scope),
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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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script_name: &str,
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line_number: i64,
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column: i64,
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) -> String {
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// TODO match this style with how typescript displays errors.
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let line_number = line_number + 1;
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let column = column + 1;
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format!("{}:{}:{}", script_name, line_number, column)
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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 self.script_resource_name.is_some() {
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let script_resource_name = self.script_resource_name.as_ref().unwrap();
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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() - 1,
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self.start_column.unwrap() - 1,
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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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write!(f, "\n{}\n", self.source_line.as_ref().unwrap())?;
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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 {
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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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