feat(forge build): add initcode size check

crates/common/src/compile.rs

@@ -44,6 +44,9 @@ pub struct ProjectCompiler {
     /// Whether to bail on compiler errors.
     bail: Option<bool>,
 
+    /// Whether to ignore the contract initcode size limit introduced by EIP-3860.
+    ignore_eip_3860: Option<bool>,
+
     /// Extra files to include, that are not necessarily in the project's source dir.
     files: Vec<PathBuf>,
 }
@@ -65,6 +68,7 @@ impl ProjectCompiler {
             print_sizes: None,
             quiet: Some(crate::shell::verbosity().is_silent()),
             bail: None,
+            ignore_eip_3860: None,
             files: Vec::new(),
         }
     }
@@ -114,6 +118,13 @@ impl ProjectCompiler {
         self
     }
 
+    /// Sets whether to ignore EIP-3860 initcode size limits.
+    #[inline]
+    pub fn ignore_eip_3860(mut self, yes: bool) -> Self {
+        self.ignore_eip_3860 = Some(yes);
+        self
+    }
+
     /// Sets extra files to include, that are not necessarily in the project's source dir.
     #[inline]
     pub fn files(mut self, files: impl IntoIterator<Item = PathBuf>) -> Self {
@@ -232,7 +243,8 @@ impl ProjectCompiler {
                 .collect();
 
             for (name, artifact) in artifacts {
-                let size = deployed_contract_size(artifact).unwrap_or_default();
+                let runtime_size = contract_size(artifact, false).unwrap_or_default();
+                let init_size = contract_size(artifact, true).unwrap_or_default();
 
                 let is_dev_contract = artifact
                     .abi
@@ -244,22 +256,32 @@ impl ProjectCompiler {
                         })
                     })
                     .unwrap_or(false);
-                size_report.contracts.insert(name, ContractInfo { size, is_dev_contract });
+                size_report
+                    .contracts
+                    .insert(name, ContractInfo { runtime_size, init_size, is_dev_contract });
             }
 
             println!("{size_report}");
 
             // TODO: avoid process::exit
             // exit with error if any contract exceeds the size limit, excluding test contracts.
-            if size_report.exceeds_size_limit() {
+            if size_report.exceeds_runtime_size_limit() {
+                std::process::exit(1);
+            }
+
+            // Check size limits only if not ignoring EIP-3860
+            if !self.ignore_eip_3860.unwrap_or(false) && size_report.exceeds_initcode_size_limit() {
                 std::process::exit(1);
             }
         }
     }
 }
 
 // https://eips.ethereum.org/EIPS/eip-170
-const CONTRACT_SIZE_LIMIT: usize = 24576;
+const CONTRACT_RUNTIME_SIZE_LIMIT: usize = 24576;
+
+// https://eips.ethereum.org/EIPS/eip-3860
+const CONTRACT_INITCODE_SIZE_LIMIT: usize = 49152;
 
 /// Contracts with info about their size
 pub struct SizeReport {
@@ -268,20 +290,34 @@ pub struct SizeReport {
 }
 
 impl SizeReport {
-    /// Returns the size of the largest contract, excluding test contracts.
-    pub fn max_size(&self) -> usize {
-        let mut max_size = 0;
-        for contract in self.contracts.values() {
-            if !contract.is_dev_contract && contract.size > max_size {
-                max_size = contract.size;
-            }
-        }
-        max_size
+    /// Returns the maximum runtime code size, excluding dev contracts.
+    pub fn max_runtime_size(&self) -> usize {
+        self.contracts
+            .values()
+            .filter(|c| !c.is_dev_contract)
+            .map(|c| c.runtime_size)
+            .max()
+            .unwrap_or(0)
+    }
+
+    /// Returns the maximum initcode size, excluding dev contracts.
+    pub fn max_init_size(&self) -> usize {
+        self.contracts
+            .values()
+            .filter(|c| !c.is_dev_contract)
+            .map(|c| c.init_size)
+            .max()
+            .unwrap_or(0)
     }
 
-    /// Returns true if any contract exceeds the size limit, excluding test contracts.
-    pub fn exceeds_size_limit(&self) -> bool {
-        self.max_size() > CONTRACT_SIZE_LIMIT
+    /// Returns true if any contract exceeds the runtime size limit, excluding dev contracts.
+    pub fn exceeds_runtime_size_limit(&self) -> bool {
+        self.max_runtime_size() > CONTRACT_RUNTIME_SIZE_LIMIT
+    }
+
+    /// Returns true if any contract exceeds the initcode size limit, excluding dev contracts.
+    pub fn exceeds_initcode_size_limit(&self) -> bool {
+        self.max_init_size() > CONTRACT_INITCODE_SIZE_LIMIT
     }
 }
 
@@ -291,29 +327,49 @@ impl Display for SizeReport {
         table.load_preset(ASCII_MARKDOWN);
         table.set_header([
             Cell::new("Contract").add_attribute(Attribute::Bold).fg(Color::Blue),
-            Cell::new("Size (B)").add_attribute(Attribute::Bold).fg(Color::Blue),
-            Cell::new("Margin (B)").add_attribute(Attribute::Bold).fg(Color::Blue),
+            Cell::new("Runtime Size (B)").add_attribute(Attribute::Bold).fg(Color::Blue),
+            Cell::new("Initcode Size (B)").add_attribute(Attribute::Bold).fg(Color::Blue),
+            Cell::new("Runtime Margin (B)").add_attribute(Attribute::Bold).fg(Color::Blue),
+            Cell::new("Initcode Margin (B)").add_attribute(Attribute::Bold).fg(Color::Blue),
         ]);
 
-        // filters out non dev contracts (Test or Script)
-        let contracts = self.contracts.iter().filter(|(_, c)| !c.is_dev_contract && c.size > 0);
+        // Filters out dev contracts
+        let contracts = self
+            .contracts
+            .iter()
+            .filter(|(_, c)| !c.is_dev_contract && (c.runtime_size > 0 || c.init_size > 0));
         for (name, contract) in contracts {
-            let margin = CONTRACT_SIZE_LIMIT as isize - contract.size as isize;
-            let color = match contract.size {
+            let runtime_margin =
+                CONTRACT_RUNTIME_SIZE_LIMIT as isize - contract.runtime_size as isize;
+            let init_margin = CONTRACT_INITCODE_SIZE_LIMIT as isize - contract.init_size as isize;
+
+            let runtime_color = match contract.runtime_size {
                 0..=17999 => Color::Reset,
-                18000..=CONTRACT_SIZE_LIMIT => Color::Yellow,
+                18000..=CONTRACT_RUNTIME_SIZE_LIMIT => Color::Yellow,
+                _ => Color::Red,
+            };
+
+            let init_color = match contract.init_size {
+                0..=35999 => Color::Reset,
+                36000..=CONTRACT_INITCODE_SIZE_LIMIT => Color::Yellow,
                 _ => Color::Red,
             };
 
             let locale = &Locale::en;
             table.add_row([
-                Cell::new(name).fg(color),
-                Cell::new(contract.size.to_formatted_string(locale))
+                Cell::new(name).fg(Color::Blue),
+                Cell::new(contract.runtime_size.to_formatted_string(locale))
                     .set_alignment(CellAlignment::Right)
-                    .fg(color),
-                Cell::new(margin.to_formatted_string(locale))
+                    .fg(runtime_color),
+                Cell::new(contract.init_size.to_formatted_string(locale))
                     .set_alignment(CellAlignment::Right)
-                    .fg(color),
+                    .fg(init_color),
+                Cell::new(runtime_margin.to_formatted_string(locale))
+                    .set_alignment(CellAlignment::Right)
+                    .fg(runtime_color),
+                Cell::new(init_margin.to_formatted_string(locale))
+                    .set_alignment(CellAlignment::Right)
+                    .fg(init_color),
             ]);
         }
 
@@ -322,30 +378,35 @@ impl Display for SizeReport {
     }
 }
 
-/// Returns the size of the deployed contract
-pub fn deployed_contract_size<T: Artifact>(artifact: &T) -> Option<usize> {
-    let bytecode = artifact.get_deployed_bytecode_object()?;
+/// Returns the deployed or init size of the contract.
+fn contract_size<T: Artifact>(artifact: &T, initcode: bool) -> Option<usize> {
+    let bytecode = if initcode {
+        artifact.get_bytecode_object()?
+    } else {
+        artifact.get_deployed_bytecode_object()?
+    };
+
     let size = match bytecode.as_ref() {
         BytecodeObject::Bytecode(bytes) => bytes.len(),
         BytecodeObject::Unlinked(unlinked) => {
-            // we don't need to account for placeholders here, because library placeholders take up
-            // 40 characters: `__$<library hash>$__` which is the same as a 20byte address in hex.
             let mut size = unlinked.as_bytes().len();
             if unlinked.starts_with("0x") {
                 size -= 2;
             }
-            // hex -> bytes
             size / 2
         }
     };
+
     Some(size)
 }
 
 /// How big the contract is and whether it is a dev contract where size limits can be neglected
 #[derive(Clone, Copy, Debug)]
 pub struct ContractInfo {
-    /// size of the contract in bytes
-    pub size: usize,
+    /// Size of the runtime code in bytes
+    pub runtime_size: usize,
+    /// Size of the initcode in bytes
+    pub init_size: usize,
     /// A development contract is either a Script or a Test contract.
     pub is_dev_contract: bool,
 }

crates/forge/bin/cmd/build.rs

@@ -60,6 +60,11 @@ pub struct BuildArgs {
     #[serde(skip)]
     pub sizes: bool,
 
+    /// Ignore initcode contract bytecode size limit introduced by EIP-3860
+    #[arg(long, alias = "ignore-initcode-size")]
+    #[serde(skip)]
+    pub ignore_eip_3860: bool,
+
     #[command(flatten)]
     #[serde(flatten)]
     pub args: CoreBuildArgs,
@@ -102,6 +107,7 @@ impl BuildArgs {
             .files(files)
             .print_names(self.names)
             .print_sizes(self.sizes)
+            .ignore_eip_3860(self.ignore_eip_3860)
             .quiet(self.format_json)
             .bail(!self.format_json);
 
@@ -158,6 +164,10 @@ impl Provider for BuildArgs {
             dict.insert("sizes".to_string(), true.into());
         }
 
+        if self.ignore_eip_3860 {
+            dict.insert("ignore_eip_3860".to_string(), true.into());
+        }
+
         Ok(Map::from([(Config::selected_profile(), dict)]))
     }
 }

crates/forge/tests/cli/build.rs

@@ -1,3 +1,5 @@
+use crate::test_helpers::generate_large_contract;
+
 use foundry_config::Config;
 use foundry_test_utils::{forgetest, snapbox::IntoData, str};
 use globset::Glob;
@@ -42,6 +44,16 @@ contract Dummy {
 "#]].is_json());
 });
 
+forgetest!(initcode_size_exceeds_limit, |prj, cmd| {
+    prj.add_source("LargeContract", generate_large_contract(5450).as_str()).unwrap();
+    cmd.args(["build", "--sizes"]).assert_failure();
+});
+
+forgetest!(initcode_size_limit_can_be_ignored, |prj, cmd| {
+    prj.add_source("LargeContract", generate_large_contract(5450).as_str()).unwrap();
+    cmd.args(["build", "--sizes", "--ignore-eip-3860"]).assert_success();
+});
+
 // tests build output is as expected
 forgetest_init!(exact_build_output, |prj, cmd| {
     cmd.args(["build", "--force"]).assert_success().stdout_eq(str![[r#"
@@ -57,9 +69,9 @@ forgetest_init!(build_sizes_no_forge_std, |prj, cmd| {
     cmd.args(["build", "--sizes"]).assert_success().stdout_eq(str![
         r#"
 ...
-| Contract | Size (B) | Margin (B) |
-|----------|----------|------------|
-| Counter  |      247 |     24,329 |
+| Contract | Runtime Size (B) | Initcode Size (B) | Runtime Margin (B) | Initcode Margin (B) |
+|----------|------------------|-------------------|--------------------|---------------------|
+| Counter  |              247 |               277 |             24,329 |              48,875 |
 ...
 "#
     ]);

crates/forge/tests/cli/cmd.rs

@@ -2186,9 +2186,9 @@ forgetest_init!(can_build_sizes_repeatedly, |prj, cmd| {
 [COMPILING_FILES] with [SOLC_VERSION]
 [SOLC_VERSION] [ELAPSED]
 Compiler run successful!
-| Contract | Size (B) | Margin (B) |
-|----------|----------|------------|
-| Counter  |      247 |     24,329 |
+| Contract | Runtime Size (B) | Initcode Size (B) | Runtime Margin (B) | Initcode Margin (B) |
+|----------|------------------|-------------------|--------------------|---------------------|
+| Counter  |              247 |               277 |             24,329 |              48,875 |
 
 
 "#]]);

crates/forge/tests/cli/main.rs

@@ -21,6 +21,7 @@ mod script;
 mod soldeer;
 mod svm;
 mod test_cmd;
+mod test_helpers;
 mod verify;
 mod verify_bytecode;
 

crates/forge/tests/cli/test_helpers.rs

@@ -0,0 +1,26 @@
+//! Test helpers for Forge CLI tests.
+
+// This function generates a string containing the code of a Solidity contract
+// with a variable init code size.
+pub fn generate_large_contract(num_elements: usize) -> String {
+    let mut contract_code = String::new();
+
+    contract_code.push_str(
+        "// Auto-generated Solidity contract to inflate initcode size\ncontract HugeContract {\n    uint256 public number;\n"
+    );
+
+    contract_code.push_str("    uint256[] public largeArray;\n\n    constructor() {\n");
+    contract_code.push_str("        largeArray = [");
+
+    for i in 0..num_elements {
+        if i != 0 {
+            contract_code.push_str(", ");
+        }
+        contract_code.push_str(&i.to_string());
+    }
+
+    contract_code.push_str("];\n");
+    contract_code.push_str("    }\n}");
+
+    contract_code
+}