fix(es/parser): Fix stack overflow due to deeply nested if (#6910)

**Related issue:**

 - Closes #6813.

Author: kdy1

.github/workflows/CI.yml

@@ -660,6 +660,7 @@ jobs:
       - name: Run cargo test (plugin)
         if: matrix.settings.crate == 'swc_plugin_runner'
         run: |
+          # export CARGO_TARGET_DIR=$(pwd)/target
           cargo test -p swc_plugin_runner --release --features plugin_transform_schema_v1 --features rkyv-impl --features ecma --features css
 
       - name: Run cargo test (swc_ecma_minifier)

Cargo.lock

@@ -37,6 +37,9 @@ swc_ecma_visit = { version = "0.82.3", path = "../swc_ecma_visit", optional = tr
 tracing        = "0.1.32"
 typed-arena    = "2.0.1"
 
+[target.'cfg(not(target_arch = "wasm32"))'.dependencies]
+stacker = "0.1.15"
+
 [dev-dependencies]
 criterion         = "0.3"
 pretty_assertions = "1.1"

crates/swc_ecma_parser/Cargo.toml

@@ -446,3 +446,13 @@ expose!(parse_file_as_expr, Box<Expr>, |p| {
 expose!(parse_file_as_module, Module, |p| { p.parse_module() });
 expose!(parse_file_as_script, Script, |p| { p.parse_script() });
 expose!(parse_file_as_program, Program, |p| { p.parse_program() });
+
+#[inline(always)]
+#[cfg_attr(target_arch = "wasm32", allow(unused))]
+fn maybe_grow<R, F: FnOnce() -> R>(red_zone: usize, stack_size: usize, callback: F) -> R {
+    #[cfg(target_arch = "wasm32")]
+    return callback();
+
+    #[cfg(not(target_arch = "wasm32"))]
+    return stacker::maybe_grow(red_zone, stack_size, callback);
+}

crates/swc_ecma_parser/src/lib.rs

@@ -486,15 +486,18 @@ impl<'a, I: Tokens> Parser<I> {
         }
 
         let cons = {
-            // Annex B
-            if !self.ctx().strict && is!(self, "function") {
-                // TODO: report error?
-            }
-            let ctx = Context {
-                ignore_else_clause: false,
-                ..self.ctx()
-            };
-            self.with_ctx(ctx).parse_stmt(false).map(Box::new)?
+            // Prevent stack overflow
+            crate::maybe_grow(512 * 1024, 2 * 1024 * 1024, || {
+                // Annex B
+                if !self.ctx().strict && is!(self, "function") {
+                    // TODO: report error?
+                }
+                let ctx = Context {
+                    ignore_else_clause: false,
+                    ..self.ctx()
+                };
+                self.with_ctx(ctx).parse_stmt(false).map(Box::new)
+            })?
         };
 
         // We parse `else` branch iteratively, to avoid stack overflow
@@ -516,13 +519,15 @@ impl<'a, I: Tokens> Parser<I> {
                 }
 
                 if !is!(self, "if") {
-                    let ctx = Context {
-                        ignore_else_clause: false,
-                        ..self.ctx()
-                    };
-
                     // As we eat `else` above, we need to parse statement once.
-                    let last = self.with_ctx(ctx).parse_stmt(false)?;
+                    let last = crate::maybe_grow(512 * 1024, 2 * 1024 * 1024, || {
+                        let ctx = Context {
+                            ignore_else_clause: false,
+                            ..self.ctx()
+                        };
+
+                        self.with_ctx(ctx).parse_stmt(false)
+                    })?;
                     break Some(last);
                 }
 

crates/swc_ecma_parser/src/parser/stmt.rs

@@ -0,0 +1,115 @@
+#![allow(clippy::needless_update)]
+
+use std::{
+    fs::File,
+    io::Read,
+    path::{Path, PathBuf},
+};
+
+use swc_common::{comments::SingleThreadedComments, FileName};
+use swc_ecma_ast::*;
+use swc_ecma_parser::{lexer::Lexer, EsConfig, PResult, Parser, StringInput, Syntax};
+use swc_ecma_visit::FoldWith;
+use testing::StdErr;
+
+use crate::common::Normalizer;
+
+#[path = "common/mod.rs"]
+mod common;
+
+#[testing::fixture("tests/js/**/*.js")]
+fn spec(file: PathBuf) {
+    let output = file.parent().unwrap().join(format!(
+        "{}.json",
+        file.file_name().unwrap().to_string_lossy()
+    ));
+    run_spec(&file, &output);
+}
+
+fn run_spec(file: &Path, output_json: &Path) {
+    let file_name = file
+        .display()
+        .to_string()
+        .replace("\\\\", "/")
+        .replace('\\', "/");
+
+    {
+        // Drop to reduce memory usage.
+        //
+        // Because the test suite contains lots of test cases, it results in oom in
+        // github actions.
+        let input = {
+            let mut buf = String::new();
+            File::open(file).unwrap().read_to_string(&mut buf).unwrap();
+            buf
+        };
+
+        eprintln!(
+            "\n\n========== Running reference test {}\nSource:\n{}\n",
+            file_name, input
+        );
+    }
+
+    with_parser(false, file, false, |p, _| {
+        let program = p.parse_program()?.fold_with(&mut Normalizer {
+            drop_span: false,
+            is_test262: false,
+        });
+
+        let json =
+            serde_json::to_string_pretty(&program).expect("failed to serialize module as json");
+
+        if StdErr::from(json).compare_to_file(output_json).is_err() {
+            panic!()
+        }
+
+        Ok(())
+    })
+    .map_err(|_| ())
+    .unwrap();
+}
+
+fn with_parser<F, Ret>(
+    treat_error_as_bug: bool,
+    file_name: &Path,
+    shift: bool,
+    f: F,
+) -> Result<Ret, StdErr>
+where
+    F: FnOnce(&mut Parser<Lexer<StringInput<'_>>>, &SingleThreadedComments) -> PResult<Ret>,
+{
+    ::testing::run_test(treat_error_as_bug, |cm, handler| {
+        if shift {
+            cm.new_source_file(FileName::Anon, "".into());
+        }
+
+        let comments = SingleThreadedComments::default();
+
+        let fm = cm
+            .load_file(file_name)
+            .unwrap_or_else(|e| panic!("failed to load {}: {}", file_name.display(), e));
+
+        let lexer = Lexer::new(
+            Syntax::Es(EsConfig {
+                ..Default::default()
+            }),
+            EsVersion::Es2015,
+            (&*fm).into(),
+            Some(&comments),
+        );
+
+        let mut p = Parser::new_from(lexer);
+
+        let res = f(&mut p, &comments).map_err(|e| e.into_diagnostic(handler).emit());
+
+        for err in p.take_errors() {
+            err.into_diagnostic(handler).emit();
+        }
+
+        if handler.has_errors() {
+            return Err(());
+        }
+
+        res
+    })
+}