Add fuzzer config files for oss-fuzz and a solidity fuzzing dictionary.

Update ossfuzz README.md.

test/tools/ossfuzz/README.md

@@ -8,6 +8,14 @@ To help oss-fuzz do this, we (as project maintainers) need to provide the follow
 
 - test harnesses: C/C++ tests that define the `LLVMFuzzerTestOneInput` API. This determines what is to be fuzz tested.
 - build infrastructure: (c)make targets per fuzzing binary. Fuzzing requires coverage and memory instrumentation of the code to be fuzzed.
+- configuration files: These are files with the `.options` extension that are parsed by oss-fuzz. The only option that we use currently is the `dictionary` option that asks the fuzzing engines behind oss-fuzz to use the specified dictionary. The specified dictionary happens to be `solidity.dict.`
+
+`solidity.dict` contains Solidity-specific syntactical tokens that are more likely to guide the fuzzer towards generating parseable and varied Solidity input.
+
+To be consistent and aid better evaluation of the utility of the fuzzing dictionary, we stick to the following rules-of-thumb:
+  - Full tokens such as `block.number` are preceded and followed by a whitespace
+  - Incomplete tokens including function calls such as `msg.sender.send()` are abbreviated `.send(` to provide some leeway to the fuzzer to sythesize variants such as `address(this).send()`
+  - Language keywords are suffixed by a whitespace with the exception of those that end a line of code such as `break;` and `continue;`
 
 ## What is libFuzzingEngine.a?
 

test/tools/ossfuzz/config/solc_noopt_ossfuzz.options

@@ -0,0 +1,2 @@
+[libfuzzer]
+dict = solidity.dict

test/tools/ossfuzz/config/solc_opt_ossfuzz.options

@@ -0,0 +1,2 @@
+[libfuzzer]
+dict = solidity.dict

test/tools/ossfuzz/config/solidity.dict

@@ -0,0 +1,213 @@
+" address(this).balance "
+" block.coinbase "
+" block.difficulty "
+" block.gaslimit "
+" block.number "
+" block.timestamp "
+" days "
+" ether "
+" finney "
+" gasleft() "
+" hours "
+" minutes "
+" msg.data "
+" msg.gas "
+" msg.sender "
+" msg.sig "
+" msg.value "
+" now "
+" seconds "
+" szabo "
+" tx.gasprice "
+" tx.origin "
+" weeks "
+" wei "
+" years "
+"!="
+"%"
+"&"
+"("
+")"
+"*"
+"**"
+"+"
+"++"
+"-"
+"--"
+".balance"
+".call("
+".callcode("
+".creationCode"
+".delegatecall("
+".gas("
+".kill("
+".length"
+".pop();"
+".push("
+".runtimeCode"
+".send("
+".staticcall("
+".transfer("
+".value"
+"/"
+"//"
+"0**0"
+"1.1"
+"2e10"
+":="
+";"
+"<"
+"<<"
+"<="
+"=="
+">"
+">="
+">>"
+"[a, b, c]"
+"\\udead"
+"\\xff"
+"^"
+"abi.encode("
+"abi.encodePacked("
+"abi.encodeWithSelector("
+"abi.encodeWithSignature("
+"add("
+"addmod("
+"address(this).call("
+"address(this).callcode("
+"address(this).delegatecall("
+"address(this).send("
+"address(this).transfer("
+"anonymous"
+"assembly { "
+"assert("
+"block.blockhash("
+"bool "
+"break;"
+"byte "
+"bytes("
+"bytes1 "
+"bytes10 "
+"bytes11 "
+"bytes12 "
+"bytes13 "
+"bytes14 "
+"bytes15 "
+"bytes16 "
+"bytes17 "
+"bytes18 "
+"bytes19 "
+"bytes2 "
+"bytes20 "
+"bytes21 "
+"bytes22 "
+"bytes23 "
+"bytes24 "
+"bytes25 "
+"bytes26 "
+"bytes27 "
+"bytes28 "
+"bytes29 "
+"bytes3 "
+"bytes30 "
+"bytes32 "
+"bytes4 "
+"bytes5 "
+"bytes6 "
+"bytes7 "
+"bytes8 "
+"bytes9 "
+"constant "
+"constructor "
+"continue;"
+"contract "
+"delete "
+"do "
+"ecrecover("
+"else "
+"emit a("
+"enum B { "
+"event e("
+"external "
+"false "
+"fixed "
+"fixed128x128 "
+"for (a=0;a<2;a++) "
+"function bid() public payable { "
+"hex\"001122FF\""
+"if "
+"int "
+"int x = -2**255;"
+"int256 "
+"int8 "
+"interface i { "
+"internal "
+"is "
+"keccak256("
+"keccak256.gas("
+"keccak256.value("
+"let x := "
+"library l { "
+"log0("
+"log1("
+"log2("
+"log3("
+"log4("
+"mapping("
+"memory m = "
+"modifier onlySeller() { "
+"mulmod("
+"new "
+"payable "
+"pragma experimental ABIEncoderV2;"
+"pragma experimental SMTChecker;"
+"pragma solidity >=0.4.0;"
+"pragma solidity ^90.90.0"
+"public "
+"pure "
+"require("
+"require(msg.sender == 0,\"\""
+"return "
+"returns ("
+"revert("
+"ripemd160("
+"ripemd160.gas("
+"ripemd160.value("
+"self"
+"selfdestruct("
+"sha256("
+"sha256.gas("
+"sha256.value("
+"sha3("
+"storage sto = "
+"string memory str = "
+"string storage str = "
+"struct V { "
+"suicide("
+"super "
+"switch "
+"this"
+"throw "
+"true "
+"try "
+"type("
+"ufixed "
+"ufixed128x128 "
+"uint "
+"uint256 "
+"uint8 "
+"uint[] "
+"uint[][5] "
+"using "
+"var "
+"view "
+"while "
+"x % y"
+"x * 2**y"
+"x / 2**y"
+"x << y"
+"{ uint x; }"
+"{"
+"|"
+"}"
+"~"