Merge pull request #13698 from ethereum/evm-paris

Add basic support for the EVM version Paris

Author: cameel

.circleci/soltest_all.sh

@@ -31,7 +31,7 @@ REPODIR="$(realpath "$(dirname "$0")"/..)"
 # shellcheck source=scripts/common.sh
 source "${REPODIR}/scripts/common.sh"
 
-EVM_VALUES=(homestead byzantium constantinople petersburg istanbul berlin london)
+EVM_VALUES=(homestead byzantium constantinople petersburg istanbul berlin london paris)
 DEFAULT_EVM=london
 [[ " ${EVM_VALUES[*]} " =~ $DEFAULT_EVM ]]
 OPTIMIZE_VALUES=(0 1)

Changelog.md

@@ -6,6 +6,7 @@ Language Features:
 Compiler Features:
  * Commandline Interface: Return exit code ``2`` on uncaught exceptions.
  * Commandline Interface: Add `--no-cbor-metadata` that skips CBOR metadata from getting appended at the end of the bytecode.
+ * EVM: Basic support for the EVM version "Paris".
  * Natspec: Add event Natspec inheritance for devdoc.
  * Standard JSON: Add a boolean field `settings.metadata.appendCBOR` that skips CBOR metadata from getting appended at the end of the bytecode.
  * Yul Optimizer: Allow replacing the previously hard-coded cleanup sequence by specifying custom steps after a colon delimiter (``:``) in the sequence string.

docs/using-the-compiler.rst

@@ -172,7 +172,8 @@ at each version. Backward compatibility is not guaranteed between each version.
      the optimizer.
 - ``london`` (**default**)
    - The block's base fee (`EIP-3198 <https://eips.ethereum.org/EIPS/eip-3198>`_ and `EIP-1559 <https://eips.ethereum.org/EIPS/eip-1559>`_) can be accessed via the global ``block.basefee`` or ``basefee()`` in inline assembly.
-
+- ``paris``
+   - No changes, however the semantics of the ``difficulty`` value have changed (see `EIP-4399 <https://eips.ethereum.org/EIPS/eip-4399>`_).
 
 .. index:: ! standard JSON, ! --standard-json
 .. _compiler-api:
@@ -305,7 +306,7 @@ Input Description
         },
         // Version of the EVM to compile for.
         // Affects type checking and code generation. Can be homestead,
-        // tangerineWhistle, spuriousDragon, byzantium, constantinople, petersburg, istanbul or berlin
+        // tangerineWhistle, spuriousDragon, byzantium, constantinople, petersburg, istanbul, berlin, london or paris
         "evmVersion": "byzantium",
         // Optional: Change compilation pipeline to go through the Yul intermediate representation.
         // This is false by default.

docs/yul.rst

@@ -933,7 +933,7 @@ the ``dup`` and ``swap`` instructions as well as ``jump`` instructions, labels a
 +-------------------------+-----+---+-----------------------------------------------------------------+
 | number()                |     | F | current block number                                            |
 +-------------------------+-----+---+-----------------------------------------------------------------+
-| difficulty()            |     | F | difficulty of the current block                                 |
+| difficulty()            |     | F | difficulty of the current block (see note below)                |
 +-------------------------+-----+---+-----------------------------------------------------------------+
 | gaslimit()              |     | F | block gas limit of the current block                            |
 +-------------------------+-----+---+-----------------------------------------------------------------+
@@ -948,6 +948,13 @@ the ``dup`` and ``swap`` instructions as well as ``jump`` instructions, labels a
   You need to use the ``returndatasize`` opcode to check which part of this memory area contains the return data.
   The remaining bytes will retain their values as of before the call.
 
+.. note::
+  With the Paris network upgrade the semantics of ``difficulty`` have been changed.
+  It returns the value of ``prevrandao``, which is a 256-bit value, whereas the highest recorded
+  difficulty value within Ethash was ~54 bits.
+  This change is described in `EIP-4399 <https://eips.ethereum.org/EIPS/eip-4399>`_.
+  Please note that irrelevant to which EVM version is selected in the compiler, the semantics of
+  instructions depend on the final chain of deployment.
 
 In some internal dialects, there are additional functions:
 

liblangutil/EVMVersion.h

@@ -56,10 +56,11 @@ class EVMVersion:
 	static EVMVersion istanbul() { return {Version::Istanbul}; }
 	static EVMVersion berlin() { return {Version::Berlin}; }
 	static EVMVersion london() { return {Version::London}; }
+	static EVMVersion paris() { return {Version::Paris}; }
 
 	static std::optional<EVMVersion> fromString(std::string const& _version)
 	{
-		for (auto const& v: {homestead(), tangerineWhistle(), spuriousDragon(), byzantium(), constantinople(), petersburg(), istanbul(), berlin(), london()})
+		for (auto const& v: {homestead(), tangerineWhistle(), spuriousDragon(), byzantium(), constantinople(), petersburg(), istanbul(), berlin(), london(), paris()})
 			if (_version == v.name())
 				return v;
 		return std::nullopt;
@@ -81,6 +82,7 @@ class EVMVersion:
 		case Version::Istanbul: return "istanbul";
 		case Version::Berlin: return "berlin";
 		case Version::London: return "london";
+		case Version::Paris: return "paris";
 		}
 		return "INVALID";
 	}
@@ -102,7 +104,7 @@ class EVMVersion:
 	bool canOverchargeGasForCall() const { return *this >= tangerineWhistle(); }
 
 private:
-	enum class Version { Homestead, TangerineWhistle, SpuriousDragon, Byzantium, Constantinople, Petersburg, Istanbul, Berlin, London };
+	enum class Version { Homestead, TangerineWhistle, SpuriousDragon, Byzantium, Constantinople, Petersburg, Istanbul, Berlin, London, Paris };
 
 	EVMVersion(Version _version): m_version(_version) {}
 

scripts/tests.sh

@@ -105,7 +105,7 @@ EVM_VERSIONS="homestead byzantium"
 
 if [ -z "$CI" ]
 then
-    EVM_VERSIONS+=" constantinople petersburg istanbul berlin london"
+    EVM_VERSIONS+=" constantinople petersburg istanbul berlin london paris"
 fi
 
 # And then run the Solidity unit-tests in the matrix combination of optimizer / no optimizer

solc/CommandLineParser.cpp

@@ -586,7 +586,7 @@ General Information)").c_str(),
 			g_strEVMVersion.c_str(),
 			po::value<string>()->value_name("version")->default_value(EVMVersion{}.name()),
 			"Select desired EVM version. Either homestead, tangerineWhistle, spuriousDragon, "
-			"byzantium, constantinople, petersburg, istanbul, berlin or london."
+			"byzantium, constantinople, petersburg, istanbul, berlin, london or paris."
 		)
 		(
 			g_strExperimentalViaIR.c_str(),

test/EVMHost.cpp

@@ -122,7 +122,8 @@ EVMHost::EVMHost(langutil::EVMVersion _evmVersion, evmc::VM& _vm):
 		m_evmRevision = EVMC_BERLIN;
 	else if (_evmVersion == langutil::EVMVersion::london())
 		m_evmRevision = EVMC_LONDON;
-	// TODO: support EVMVersion::paris()
+	else if (_evmVersion == langutil::EVMVersion::paris())
+		m_evmRevision = EVMC_PARIS;
 	else
 		assertThrow(false, Exception, "Unsupported EVM version");
 

test/libsolidity/StandardCompiler.cpp

@@ -1082,6 +1082,8 @@ BOOST_AUTO_TEST_CASE(evm_version)
 	BOOST_CHECK(result["contracts"]["fileA"]["A"]["metadata"].asString().find("\"evmVersion\":\"berlin\"") != string::npos);
 	result = compile(inputForVersion("\"evmVersion\": \"london\","));
 	BOOST_CHECK(result["contracts"]["fileA"]["A"]["metadata"].asString().find("\"evmVersion\":\"london\"") != string::npos);
+	result = compile(inputForVersion("\"evmVersion\": \"paris\","));
+	BOOST_CHECK(result["contracts"]["fileA"]["A"]["metadata"].asString().find("\"evmVersion\":\"paris\"") != string::npos);
 	// test default
 	result = compile(inputForVersion(""));
 	BOOST_CHECK(result["contracts"]["fileA"]["A"]["metadata"].asString().find("\"evmVersion\":\"london\"") != string::npos);

test/libsolidity/semanticTests/state/block_difficulty.sol

@@ -5,6 +5,7 @@ contract C {
 }
 // ====
 // compileToEwasm: also
+// EVMVersion: <paris
 // ----
 // f() -> 200000000
 // f() -> 200000000