diff --git a/libsolidity/interface/CompilerStack.cpp b/libsolidity/interface/CompilerStack.cpp
index 13eaae08a..7f2b15261 100644
--- a/libsolidity/interface/CompilerStack.cpp
+++ b/libsolidity/interface/CompilerStack.cpp
@@ -1322,7 +1322,7 @@ void CompilerStack::assemble(
 	}
 
 	// Throw a warning if EIP-170 limits are exceeded:
-	//   If contract creation returns data with length greater than 0x6000 (214 + 213) bytes,
+	//   If contract creation returns data with length greater than 0x6000 (2^14 + 2^13) bytes,
 	//   contract creation fails with an out of gas error.
 	if (
 		m_evmVersion >= langutil::EVMVersion::spuriousDragon() &&
@@ -1338,6 +1338,24 @@ void CompilerStack::assemble(
 			"Consider enabling the optimizer (with a low \"runs\" value!), "
 			"turning off revert strings, or using libraries."
 		);
+
+	// Throw a warning if EIP-3860 limits are exceeded:
+	//   If initcode is larger than 0xC000 bytes (twice the runtime code limit),
+	//   then contract creation fails with an out of gas error.
+	if (
+		m_evmVersion >= langutil::EVMVersion::shanghai() &&
+		compiledContract.object.bytecode.size() > 0xC000
+	)
+		m_errorReporter.warning(
+			3860_error,
+			_contract.location(),
+			"Contract initcode size is "s +
+			to_string(compiledContract.object.bytecode.size()) +
+			" bytes and exceeds 49152 bytes (a limit introduced in Shanghai). "
+			"This contract may not be deployable on Mainnet. "
+			"Consider enabling the optimizer (with a low \"runs\" value!), "
+			"turning off revert strings, or using libraries."
+		);
 }
 
 void CompilerStack::compileContract(
diff --git a/test/libsolidity/syntaxTests/bytecode_too_large.sol b/test/libsolidity/syntaxTests/sizeLimits/bytecode_too_large.sol
similarity index 100%
rename from test/libsolidity/syntaxTests/bytecode_too_large.sol
rename to test/libsolidity/syntaxTests/sizeLimits/bytecode_too_large.sol
diff --git a/test/libsolidity/syntaxTests/bytecode_too_large_abiencoder_v1.sol b/test/libsolidity/syntaxTests/sizeLimits/bytecode_too_large_abiencoder_v1.sol
similarity index 100%
rename from test/libsolidity/syntaxTests/bytecode_too_large_abiencoder_v1.sol
rename to test/libsolidity/syntaxTests/sizeLimits/bytecode_too_large_abiencoder_v1.sol
diff --git a/test/libsolidity/syntaxTests/bytecode_too_large_byzantium.sol b/test/libsolidity/syntaxTests/sizeLimits/bytecode_too_large_byzantium.sol
similarity index 100%
rename from test/libsolidity/syntaxTests/bytecode_too_large_byzantium.sol
rename to test/libsolidity/syntaxTests/sizeLimits/bytecode_too_large_byzantium.sol
diff --git a/test/libsolidity/syntaxTests/bytecode_too_large_homestead.sol b/test/libsolidity/syntaxTests/sizeLimits/bytecode_too_large_homestead.sol
similarity index 100%
rename from test/libsolidity/syntaxTests/bytecode_too_large_homestead.sol
rename to test/libsolidity/syntaxTests/sizeLimits/bytecode_too_large_homestead.sol
diff --git a/test/libsolidity/syntaxTests/sizeLimits/combined_too_large_paris.sol b/test/libsolidity/syntaxTests/sizeLimits/combined_too_large_paris.sol
new file mode 100644
index 000000000..82a3415d0
--- /dev/null
+++ b/test/libsolidity/syntaxTests/sizeLimits/combined_too_large_paris.sol
@@ -0,0 +1,31 @@
+contract A {
+    function f() public pure returns (string memory ret) {
+        // 27000 bytes long data
+        ret = ".......................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................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+    }
+}
+
+contract B is A {
+    function g() public pure returns (bool) {
+        return true;
+    }
+}
+
+contract C is A {
+    function g() public pure returns (bool) {
+        return false;
+    }
+}
+
+contract test {
+    constructor() {
+        new B();
+        new C();
+    }
+}
+// ====
+// EVMVersion: =paris
+// ----
+// Warning 5574: (0-27130): Contract code size is 27192 bytes and exceeds 24576 bytes (a limit introduced in Spurious Dragon). This contract may not be deployable on Mainnet. Consider enabling the optimizer (with a low "runs" value!), turning off revert strings, or using libraries.
+// Warning 5574: (27132-27224): Contract code size is 27218 bytes and exceeds 24576 bytes (a limit introduced in Spurious Dragon). This contract may not be deployable on Mainnet. Consider enabling the optimizer (with a low "runs" value!), turning off revert strings, or using libraries.
+// Warning 5574: (27226-27319): Contract code size is 27218 bytes and exceeds 24576 bytes (a limit introduced in Spurious Dragon). This contract may not be deployable on Mainnet. Consider enabling the optimizer (with a low "runs" value!), turning off revert strings, or using libraries.
diff --git a/test/libsolidity/syntaxTests/sizeLimits/combined_too_large_shanghai.sol b/test/libsolidity/syntaxTests/sizeLimits/combined_too_large_shanghai.sol
new file mode 100644
index 000000000..4854b0a64
--- /dev/null
+++ b/test/libsolidity/syntaxTests/sizeLimits/combined_too_large_shanghai.sol
@@ -0,0 +1,32 @@
+contract A {
+    function f() public pure returns (string memory ret) {
+        // 27000 bytes long data
+        ret = ".......................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................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+    }
+}
+
+contract B is A {
+    function g() public pure returns (bool) {
+        return true;
+    }
+}
+
+contract C is A {
+    function g() public pure returns (bool) {
+        return false;
+    }
+}
+
+contract test {
+    constructor() {
+        new B();
+        new C();
+    }
+}
+// ====
+// EVMVersion: =shanghai
+// ----
+// Warning 5574: (0-27130): Contract code size is 27186 bytes and exceeds 24576 bytes (a limit introduced in Spurious Dragon). This contract may not be deployable on Mainnet. Consider enabling the optimizer (with a low "runs" value!), turning off revert strings, or using libraries.
+// Warning 5574: (27132-27224): Contract code size is 27212 bytes and exceeds 24576 bytes (a limit introduced in Spurious Dragon). This contract may not be deployable on Mainnet. Consider enabling the optimizer (with a low "runs" value!), turning off revert strings, or using libraries.
+// Warning 5574: (27226-27319): Contract code size is 27211 bytes and exceeds 24576 bytes (a limit introduced in Spurious Dragon). This contract may not be deployable on Mainnet. Consider enabling the optimizer (with a low "runs" value!), turning off revert strings, or using libraries.
+// Warning 3860: (27321-27398): Contract initcode size is 54626 bytes and exceeds 49152 bytes (a limit introduced in Shanghai). This contract may not be deployable on Mainnet. Consider enabling the optimizer (with a low "runs" value!), turning off revert strings, or using libraries.
diff --git a/test/libsolidity/syntaxTests/sizeLimits/initcode_too_large_paris.sol b/test/libsolidity/syntaxTests/sizeLimits/initcode_too_large_paris.sol
new file mode 100644
index 000000000..cbfa94466
--- /dev/null
+++ b/test/libsolidity/syntaxTests/sizeLimits/initcode_too_large_paris.sol
@@ -0,0 +1,29 @@
+contract A {
+    function f() public pure returns (string memory ret) {
+        // 20000 bytes long data
+        ret = ".......................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................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.";
+    }
+}
+
+contract B is A {
+    function g() public pure returns (bool) {
+        return true;
+    }
+}
+
+contract C is A {
+    function g() public pure returns (bool) {
+        return false;
+    }
+}
+
+contract test {
+    constructor() {
+        new A();
+        new B();
+        new C();
+    }
+}
+// ====
+// EVMVersion: =paris
+// ----
diff --git a/test/libsolidity/syntaxTests/sizeLimits/initcode_too_large_shanghai.sol b/test/libsolidity/syntaxTests/sizeLimits/initcode_too_large_shanghai.sol
new file mode 100644
index 000000000..1f648c630
--- /dev/null
+++ b/test/libsolidity/syntaxTests/sizeLimits/initcode_too_large_shanghai.sol
@@ -0,0 +1,30 @@
+contract A {
+    function f() public pure returns (string memory ret) {
+        // 20000 bytes long data
+        ret = ".......................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................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.";
+    }
+}
+
+contract B is A {
+    function g() public pure returns (bool) {
+        return true;
+    }
+}
+
+contract C is A {
+    function g() public pure returns (bool) {
+        return false;
+    }
+}
+
+contract test {
+    constructor() {
+        new A();
+        new B();
+        new C();
+    }
+}
+// ====
+// EVMVersion: =shanghai
+// ----
+// Warning 3860: (20321-20415): Contract initcode size is 60893 bytes and exceeds 49152 bytes (a limit introduced in Shanghai). This contract may not be deployable on Mainnet. Consider enabling the optimizer (with a low "runs" value!), turning off revert strings, or using libraries.