From a985e16832f86cbc42eb6488e6f9fc2a9eff7dc7 Mon Sep 17 00:00:00 2001
From: Ömer Sinan Ağacan <omeragacan@gmail.com>
Date: Tue, 6 Aug 2024 20:17:23 +0200
Subject: [Source maps] Handle single-segment entries in source map header
 decoder (#6794)

Single-segment mappings were already handled in readNextDebugLocation,
but not in readSourceMapHeader.
---
 test/gtest/binary-reader.cpp | 63 ++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 63 insertions(+)
 create mode 100644 test/gtest/binary-reader.cpp

(limited to 'test/gtest/binary-reader.cpp')

diff --git a/test/gtest/binary-reader.cpp b/test/gtest/binary-reader.cpp
new file mode 100644
index 000000000..b73fe55bd
--- /dev/null
+++ b/test/gtest/binary-reader.cpp
@@ -0,0 +1,63 @@
+/*
+ * Copyright 2024 WebAssembly Community Group participants
+ *
+ * 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.
+ */
+
+#include "parser/wat-parser.h"
+#include "print-test.h"
+#include "wasm-binary.h"
+#include "gtest/gtest.h"
+
+using namespace wasm;
+
+using BinaryReaderTest = PrintTest;
+
+// Check that debug location parsers can handle single-segment mappings.
+TEST_F(BinaryReaderTest, SourceMappingSingleSegment) {
+  auto moduleText = "(module)";
+  Module module;
+  parseWast(module, moduleText);
+
+  BufferWithRandomAccess buffer;
+  WasmBinaryWriter(&module, buffer, PassOptions());
+  auto moduleBytes = buffer.getAsChars();
+
+  // A single-segment mapping starting at offset 0.
+  std::string sourceMap = R"(
+      {
+          "version": 3,
+          "sources": [],
+          "names": [],
+          "mappings": "A"
+      }
+  )";
+  std::stringstream sourceMapStream(sourceMap);
+
+  // Test `readSourceMapHeader` (only check for errors, as there is no mapping
+  // to print).
+  {
+    Module module;
+    WasmBinaryReader binaryReader(module, FeatureSet::All, moduleBytes);
+    binaryReader.setDebugLocations(&sourceMapStream);
+    binaryReader.readSourceMapHeader();
+  }
+
+  // Test `readNextDebugLocation`.
+  {
+    Module module;
+    WasmBinaryReader binaryReader(module, FeatureSet::All, moduleBytes);
+    binaryReader.setDebugLocations(&sourceMapStream);
+    binaryReader.readNextDebugLocation();
+  }
+}
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