Implemented transient storage in Yul and inline assembly

docs/grammar/SolidityLexer.g4

@@ -305,7 +305,7 @@ YulEVMBuiltin:
 	| 'delegatecall' | 'staticcall' | 'return' | 'revert' | 'selfdestruct' | 'invalid'
 	| 'log0' | 'log1' | 'log2' | 'log3' | 'log4' | 'chainid' | 'origin' | 'gasprice'
 	| 'blockhash' | 'coinbase' | 'timestamp' | 'number' | 'difficulty' | 'prevrandao'
-	| 'gaslimit' | 'basefee';
+	| 'gaslimit' | 'basefee' | 'tload' | 'tstore';
 
 YulLBrace: '{' -> pushMode(YulMode);
 YulRBrace: '}' -> popMode;

libevmasm/Instruction.cpp

@@ -163,6 +163,8 @@ std::map<std::string, Instruction> const solidity::evmasm::c_instructions =
 	{ "LOG2", Instruction::LOG2 },
 	{ "LOG3", Instruction::LOG3 },
 	{ "LOG4", Instruction::LOG4 },
+	{ "TLOAD", Instruction::TLOAD },
+	{ "TSTORE", Instruction::TSTORE },
 	{ "CREATE", Instruction::CREATE },
 	{ "CALL", Instruction::CALL },
 	{ "CALLCODE", Instruction::CALLCODE },
@@ -312,6 +314,8 @@ static std::map<Instruction, InstructionInfo> const c_instructionInfo =
 	{ Instruction::LOG2,		{ "LOG2",			0, 4, 0, true, Tier::Special } },
 	{ Instruction::LOG3,		{ "LOG3",			0, 5, 0, true, Tier::Special } },
 	{ Instruction::LOG4,		{ "LOG4",			0, 6, 0, true, Tier::Special } },
+	{ Instruction::TLOAD,       { "TLOAD",          0, 1, 1, false, Tier::Special} },
+	{ Instruction::TSTORE,      { "TSTORE",         0, 2, 0, true, Tier::Special} },
 	{ Instruction::CREATE,		{ "CREATE",			0, 3, 1, true, Tier::Special } },
 	{ Instruction::CALL,		{ "CALL",			0, 7, 1, true, Tier::Special } },
 	{ Instruction::CALLCODE,	{ "CALLCODE",		0, 7, 1, true, Tier::Special } },

libevmasm/Instruction.h

@@ -177,6 +177,9 @@ enum class Instruction: uint8_t
 	LOG3,				///< Makes a log entry; 3 topics.
 	LOG4,				///< Makes a log entry; 4 topics.
 
+	TLOAD = 0xb3,       ///< https://eips.ethereum.org/EIPS/eip-1153
+	TSTORE = 0xb4,      ///< https://eips.ethereum.org/EIPS/eip-1153
+
 	CREATE = 0xf0,		///< create a new account with associated code
 	CALL,				///< message-call into an account
 	CALLCODE,			///< message-call with another account's code only

libevmasm/SemanticInformation.cpp

@@ -486,6 +486,7 @@ bool SemanticInformation::invalidInPureFunctions(Instruction _instruction)
 	case Instruction::GASLIMIT:
 	case Instruction::STATICCALL:
 	case Instruction::SLOAD:
+	case Instruction::TLOAD:
 		return true;
 	default:
 		break;
@@ -505,6 +506,7 @@ bool SemanticInformation::invalidInViewFunctions(Instruction _instruction)
 	case Instruction::LOG2:
 	case Instruction::LOG3:
 	case Instruction::LOG4:
+	case Instruction::TSTORE:
 	case Instruction::CREATE:
 	case Instruction::CALL:
 	case Instruction::CALLCODE:

test/libsolidity/syntaxTests/inlineAssembly/transient.sol

@@ -0,0 +1,8 @@
+contract C {
+    function f() external returns(uint a) {
+        assembly {
+            tstore(0, 13)
+            a := tload(0)
+        }
+    }
+}

test/libsolidity/syntaxTests/viewPureChecker/tload_not_pure.sol

@@ -0,0 +1,9 @@
+contract C {
+    function f() external pure {
+        assembly {
+            pop(tload(0))
+        }
+    }
+}
+// ----
+// TypeError 2527: (81-89): Function declared as pure, but this expression (potentially) reads from the environment or state and thus requires "view".

test/libsolidity/syntaxTests/viewPureChecker/tload_view.sol

@@ -0,0 +1,7 @@
+contract C {
+    function f() external view returns (uint a) {
+        assembly {
+            a := tload(0)
+        }
+    }
+}

test/libsolidity/syntaxTests/viewPureChecker/tstore_not_view.sol

@@ -0,0 +1,9 @@
+contract C {
+    function f() external view {
+        assembly {
+            tstore(0, 0)
+        }
+    }
+}
+// ----
+// TypeError 8961: (77-89): Function cannot be declared as view because this expression (potentially) modifies the state.

test/tools/yulInterpreter/EVMInstructionInterpreter.cpp

@@ -315,6 +315,13 @@ u256 EVMInstructionInterpreter::eval(
 		accessMemory(arg[0], arg[1]);
 		logTrace(_instruction, arg);
 		return 0;
+
+	case Instruction::TLOAD:
+		// TODO
+		return 0;
+	case Instruction::TSTORE:
+		// TODO
+		return 0;
 	// --------------- calls ---------------
 	case Instruction::CREATE:
 		accessMemory(arg[1], arg[2]);