Buglist check script supports json paths

.circleci/config.yml

@@ -195,6 +195,12 @@ jobs:
       TERM: xterm
     steps:
       - checkout
+      - run:
+          name: JS deps
+          command: |
+            npm install download
+            npm install JSONPath
+            npm install mktemp
       - run:
           name: Test buglist
           command: ./test/buglistTests.js

docs/bugs.json

@@ -5,7 +5,8 @@
         "description": "If a struct is used in an event, the address of the struct is logged instead of the actual data.",
         "introduced": "0.4.17",
         "fixed": "0.5.0",
-		"severity": "very low"
+        "severity": "very low",
+        "check": {"ast-compact-json-path": "$..[?(@.nodeType === 'EventDefinition')]..[?(@.nodeType === 'UserDefinedTypeName' && @.typeDescriptions.typeString.startsWith('struct'))]"}
     },
     {
         "name": "NestedArrayFunctionCallDecoder",

docs/bugs.rst

@@ -57,13 +57,18 @@ conditions
     means that the optimizer has to be switched on to enable the bug.
     If no conditions are given, assume that the bug is present.
 check
-    This field contains JavaScript regular expressions that are to be matched
-    against the source code ("source-regex") to find out if the
-    smart contract contains the bug or not. If there is no match,
-    then the bug is very likely not present. If there is a match,
-    the bug might be present. For improved accuracy, the regular
-    expression should be applied to the source code after stripping
+    This field contains different checks that report whether the smart contract
+    contains the bug or not. The first type of check are Javascript regular
+    expressions that are to be matched against the source code ("source-regex")
+    if the bug is present.  If there is no match, then the bug is very likely
+    not present. If there is a match, the bug might be present.  For improved
+    accuracy, the checks should be applied to the source code after stripping
     comments.
+    The second type of check are patterns to be checked on the compact AST of
+    the Solidity program ("ast-compact-json-path"). The specified search query
+    is a `JsonPath <https://github.com/json-path/JsonPath>`_ expression.
+    If at least one path of the Solidity AST matches the query, the bug is
+    likely present.
 
 .. literalinclude:: bugs.json
    :language: js

test/buglistTests.js

@@ -2,6 +2,11 @@
 
 "use strict";
 
+var util = require('util')
+var exec = util.promisify(require('child_process').exec)
+var mktemp = require('mktemp');
+var download = require('download')
+var JSONPath = require('JSONPath')
 var fs = require('fs')
 var bugs = JSON.parse(fs.readFileSync(__dirname + '/../docs/bugs.json', 'utf8'))
 
@@ -19,6 +24,10 @@ var tests = fs.readFileSync(__dirname + '/buglist_test_vectors.md', 'utf8')
 
 var testVectorParser = /\s*#\s+(\S+)\s+## buggy\n([^#]*)## fine\n([^#]*)/g
 
+runTests()
+
+async function runTests()
+{
 	var result;
 	while ((result = testVectorParser.exec(tests)) !== null)
 	{
@@ -27,19 +36,99 @@ while ((result = testVectorParser.exec(tests)) !== null)
 		var fine = result[3].split('\n--\n')
 		console.log("Testing " + name + " with " + buggy.length + " buggy and " + fine.length + " fine instances")
 
-    var regex = RegExp(bugsByName[name].check['regex-source'])
+		try {
+			await checkRegex(name, buggy, fine)
+			await checkJSONPath(name, buggy, fine)
+		} catch (err) {
+			console.error("Error: " + err)
+		}
+	}
+}
+
+function checkRegex(name, buggy, fine)
+{
+    return new Promise(function(resolve, reject) {
+		var regexStr = bugsByName[name].check['regex-source']
+		if (regexStr !== undefined)
+		{
+			var regex = RegExp(regexStr)
 			for (var i in buggy)
 			{
 				if (!regex.exec(buggy[i]))
 				{
-            throw "Bug " + name + ": Buggy source does not match: " + buggy[i]
+					reject("Bug " + name + ": Buggy source does not match: " + buggy[i])
 				}
 			}
 			for (var i in fine)
 			{
 				if (regex.exec(fine[i]))
 				{
-            throw "Bug " + name + ": Non-buggy source matches: " + fine[i]
+					reject("Bug " + name + ": Non-buggy source matches: " + fine[i])
 				}
 			}
 		}
+		resolve()
+	})
+}
+
+async function checkJSONPath(name, buggy, fine)
+{
+	var jsonPath = bugsByName[name].check['ast-compact-json-path']
+	if (jsonPath !== undefined)
+	{
+		var url = "http://github.com/ethereum/solidity/releases/download/v" + bugsByName[name].introduced + "/solc-static-linux"
+		try {
+			var tmpdir = await mktemp.createDir('XXXXX')
+			var binary = tmpdir + "/solc-static-linux"
+			await download(url, tmpdir)
+			exec("chmod +x " + binary)
+			for (var i in buggy)
+			{
+				var result = await checkJsonPathTest(buggy[i], tmpdir, binary, jsonPath, i)
+				if (!result)
+					throw "Bug " + name + ": Buggy source does not contain path: " + buggy[i]
+			}
+			for (var i in fine)
+			{
+				var result = await checkJsonPathTest(fine[i], tmpdir, binary, jsonPath, i + buggy.length)
+				if (result)
+					throw "Bug " + name + ": Non-buggy source contains path: " + fine[i]
+			}
+			exec("rm -r " + tmpdir)
+		} catch (err) {
+			throw err
+		}
+	}
+}
+
+function checkJsonPathTest(code, tmpdir, binary, query, idx) {
+    return new Promise(function(resolve, reject) {
+        var solFile = tmpdir + "/jsonPath" + idx + ".sol"
+        var astFile = tmpdir + "/ast" + idx + ".json"
+        writeFilePromise(solFile, code)
+        .then(() => {
+            return exec(binary + " --ast-compact-json " + solFile + " > " + astFile)
+        })
+        .then(() => {
+            var jsonRE = /(\{[\s\S]*\})/
+            var ast = JSON.parse(jsonRE.exec(fs.readFileSync(astFile, 'utf8'))[0])
+            var result = JSONPath({json: ast, path: query})
+            if (result.length > 0)
+                resolve(true)
+            else
+                resolve(false)
+        })
+        .catch((err) => {
+            reject(err)
+        })
+    })
+}
+
+function writeFilePromise(filename, data) {
+    return new Promise(function(resolve, reject) {
+        fs.writeFile(filename, data, 'utf8', function(err) {
+            if (err) reject(err)
+            else resolve(data)
+        })
+    })
+}

test/buglist_test_vectors.md

@@ -67,3 +67,48 @@ function f() m(uint[2][2]) { }
 --
 
 function f() returns (uint, uint) { uint[2][2] memory x; }
+
+# EventStructWrongData
+
+## buggy
+
+pragma experimental ABIEncoderV2;
+contract C
+{
+	struct S { uint x; }
+	event E(S);
+	event F(S);
+	enum A { B, C }
+	event G(A);
+	function f(S s);
+}
+
+--
+
+pragma experimental ABIEncoderV2;
+contract C
+{
+	struct S { uint x; }
+	event E(S indexed);
+	event F(uint, S, bool);
+}
+
+## fine
+
+pragma experimental ABIEncoderV2;
+contract C
+{
+	struct S { uint x; }
+	enum A { B, C }
+	event G(A);
+}
+
+--
+
+pragma experimental ABIEncoderV2;
+contract C
+{
+	struct S { uint x; }
+	function f(S s);
+	S s1;
+}