Adding upstream version 86.0.1.upstream/86.0.1upstream

Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>

1 files changed, 91 insertions, 0 deletions

diff --git a/js/src/rust/wasm.rs b/js/src/rust/wasm.rs
new file mode 100644
index 0000000000..c8230063c0
--- /dev/null
+++ b/js/src/rust/wasm.rs
@@ -0,0 +1,91 @@
+/* Copyright 2020 Mozilla Foundation
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+#[no_mangle]
+pub unsafe extern "C" fn wasm_text_to_binary(
+    text: *const u16,
+    text_len: usize,
+    out_bytes: *mut *mut u8,
+    out_bytes_len: *mut usize,
+    out_error: *mut *mut u8,
+    out_error_len: *mut usize,
+) -> bool {
+    let text_slice = std::slice::from_raw_parts(text, text_len);
+    let text = String::from_utf16_lossy(text_slice);
+    match wat::parse_str(&text) {
+        Ok(bytes) => {
+            let bytes_box = bytes.into_boxed_slice();
+            let bytes_slice = Box::leak(bytes_box);
+            out_bytes.write(bytes_slice.as_mut_ptr());
+            out_bytes_len.write(bytes_slice.len());
+            true
+        }
+        Err(error) => {
+            let error = Box::leak(format!("{}\0", error).into_boxed_str());
+            out_error.write(error.as_mut_ptr());
+            out_error_len.write(error.len());
+            false
+        }
+    }
+}
+
+#[no_mangle]
+pub unsafe extern "C" fn wasm_code_offsets(
+    bytes: *const u8,
+    bytes_len: usize,
+    out_offsets: *mut *mut u32,
+    out_offsets_len: *mut usize,
+) {
+    fn code_offsets(bytes: &[u8]) -> Vec<u32> {
+        use wasmparser::*;
+
+        if bytes.is_empty() {
+            return Vec::new();
+        }
+
+        let mut offsets = Vec::new();
+        let mut parser = Parser::new(bytes);
+        let mut next_input = ParserInput::Default;
+
+        while !parser.eof() {
+            let offset = parser.current_position();
+            match parser.read_with_input(next_input) {
+                ParserState::BeginSection { code, .. } if *code != SectionCode::Code => {
+                    next_input = ParserInput::SkipSection;
+                }
+                ParserState::CodeOperator(..) => {
+                    offsets.push(offset as u32);
+                    next_input = ParserInput::Default
+                }
+                _ => next_input = ParserInput::Default,
+            }
+        }
+
+        offsets
+    }
+
+    let bytes = std::slice::from_raw_parts(bytes, bytes_len);
+    let offsets = code_offsets(bytes);
+
+    if offsets.len() == 0 {
+        out_offsets.write(std::ptr::null_mut());
+        out_offsets_len.write(0);
+    } else {
+        let offsets_box = offsets.into_boxed_slice();
+        let offsets_slice = Box::leak(offsets_box);
+        out_offsets.write(offsets_slice.as_mut_ptr());
+        out_offsets_len.write(offsets_slice.len());
+    }
+}