feat: don't request Solc JSON AST unless absolutely necessary

crates/chisel/src/session_source.rs

@@ -318,15 +318,10 @@ impl SessionSource {
         let mut sources = Sources::new();
         sources.insert(self.file_name.clone(), Source::new(self.to_repl_source()));
 
+        let remappings = self.config.foundry_config.get_all_remappings().collect::<Vec<_>>();
+
         // Include Vm.sol if forge-std remapping is not available
-        if !self.config.no_vm &&
-            !self
-                .config
-                .foundry_config
-                .get_all_remappings()
-                .into_iter()
-                .any(|r| r.name.starts_with("forge-std"))
-        {
+        if !self.config.no_vm && !remappings.iter().any(|r| r.name.starts_with("forge-std")) {
             sources.insert(PathBuf::from("forge-std/Vm.sol"), Source::new(VM_SOURCE));
         }
 
@@ -337,7 +332,7 @@ impl SessionSource {
             .expect("Solidity source not found");
 
         // get all remappings from the config
-        compiler_input.settings.remappings = self.config.foundry_config.get_all_remappings();
+        compiler_input.settings.remappings = remappings;
 
         // We also need to enforce the EVM version that the user has specified.
         compiler_input.settings.evm_version = Some(self.config.foundry_config.evm_version);

crates/cli/src/opts/build/core.rs

@@ -216,6 +216,10 @@ impl Provider for CoreBuildArgs {
             dict.insert("build_info".to_string(), self.build_info.into());
         }
 
+        if self.compiler.ast {
+            dict.insert("ast".to_string(), true.into());
+        }
+
         if self.compiler.optimize {
             dict.insert("optimizer".to_string(), self.compiler.optimize.into());
         }

crates/cli/src/opts/build/mod.rs

@@ -15,6 +15,11 @@ pub use self::paths::ProjectPathsArgs;
 #[derive(Clone, Debug, Default, Serialize, Parser)]
 #[clap(next_help_heading = "Compiler options")]
 pub struct CompilerArgs {
+    /// Includes the AST as JSON in the compiler output.
+    #[clap(long, help_heading = "Compiler options")]
+    #[serde(skip)]
+    pub ast: bool,
+
     /// The target EVM version.
     #[clap(long, value_name = "VERSION")]
     #[serde(skip_serializing_if = "Option::is_none")]

crates/cli/src/utils/mod.rs

@@ -30,7 +30,7 @@ pub use foundry_config::utils::*;
 /// Deterministic fuzzer seed used for gas snapshots and coverage reports.
 ///
 /// The keccak256 hash of "foundry rulez"
-pub static STATIC_FUZZ_SEED: [u8; 32] = [
+pub const STATIC_FUZZ_SEED: [u8; 32] = [
     0x01, 0x00, 0xfa, 0x69, 0xa5, 0xf1, 0x71, 0x0a, 0x95, 0xcd, 0xef, 0x94, 0x88, 0x9b, 0x02, 0x84,
     0x5d, 0x64, 0x0b, 0x19, 0xad, 0xf0, 0xe3, 0x57, 0xb8, 0xd4, 0xbe, 0x7d, 0x49, 0xee, 0x70, 0xe6,
 ];

crates/common/src/compile.rs

@@ -2,10 +2,10 @@
 
 use crate::{compact_to_contract, glob::GlobMatcher, term::SpinnerReporter, TestFunctionExt};
 use comfy_table::{presets::ASCII_MARKDOWN, Attribute, Cell, Color, Table};
-use eyre::Result;
+use eyre::{Context, Result};
 use foundry_block_explorers::contract::Metadata;
 use foundry_compilers::{
-    artifacts::{BytecodeObject, ContractBytecodeSome},
+    artifacts::{BytecodeObject, CompactContractBytecode, ContractBytecodeSome},
     remappings::Remapping,
     report::{BasicStdoutReporter, NoReporter, Report},
     Artifact, ArtifactId, FileFilter, Graph, Project, ProjectCompileOutput, ProjectPathsConfig,
@@ -281,6 +281,32 @@ pub struct ContractSources {
 }
 
 impl ContractSources {
+    /// Collects the contract sources and artifacts from the project compile output.
+    pub fn from_project_output(
+        output: &ProjectCompileOutput,
+        root: &Path,
+    ) -> Result<ContractSources> {
+        let mut sources = ContractSources::default();
+        for (id, artifact) in output.artifact_ids() {
+            if let Some(file_id) = artifact.id {
+                let abs_path = root.join(&id.path);
+                let source_code = std::fs::read_to_string(abs_path).wrap_err_with(|| {
+                    format!("failed to read artifact source file for `{}`", id.identifier())
+                })?;
+                let compact = CompactContractBytecode {
+                    abi: artifact.abi.clone(),
+                    bytecode: artifact.bytecode.clone(),
+                    deployed_bytecode: artifact.deployed_bytecode.clone(),
+                };
+                let contract = compact_to_contract(compact)?;
+                sources.insert(&id, file_id, source_code, contract);
+            } else {
+                warn!(id = id.identifier(), "source not found");
+            }
+        }
+        Ok(sources)
+    }
+
     /// Inserts a contract into the sources.
     pub fn insert(
         &mut self,

crates/common/src/contracts.rs

@@ -2,6 +2,7 @@
 
 use alloy_json_abi::{Event, Function, JsonAbi};
 use alloy_primitives::{hex, Address, Selector, B256};
+use eyre::Result;
 use foundry_compilers::{
     artifacts::{CompactContractBytecode, ContractBytecodeSome},
     ArtifactId, ProjectPathsConfig,
@@ -33,10 +34,7 @@ impl ContractsByArtifact {
 
     /// Finds a contract which has the same contract name or identifier as `id`. If more than one is
     /// found, return error.
-    pub fn find_by_name_or_identifier(
-        &self,
-        id: &str,
-    ) -> eyre::Result<Option<ArtifactWithContractRef>> {
+    pub fn find_by_name_or_identifier(&self, id: &str) -> Result<Option<ArtifactWithContractRef>> {
         let contracts = self
             .iter()
             .filter(|(artifact, _)| artifact.name == id || artifact.identifier() == id)
@@ -203,9 +201,7 @@ pub fn get_artifact_path(paths: &ProjectPathsConfig, path: &str) -> PathBuf {
 }
 
 /// Helper function to convert CompactContractBytecode ~> ContractBytecodeSome
-pub fn compact_to_contract(
-    contract: CompactContractBytecode,
-) -> eyre::Result<ContractBytecodeSome> {
+pub fn compact_to_contract(contract: CompactContractBytecode) -> Result<ContractBytecodeSome> {
     Ok(ContractBytecodeSome {
         abi: contract.abi.ok_or_else(|| eyre::eyre!("No contract abi"))?,
         bytecode: contract.bytecode.ok_or_else(|| eyre::eyre!("No contract bytecode"))?.into(),

crates/config/README.md

@@ -138,6 +138,7 @@ extra_output_files = []
 names = false
 sizes = false
 via_ir = false
+ast = false
 # caches storage retrieved locally for certain chains and endpoints
 # can also be restricted to `chains = ["optimism", "mainnet"]`
 # by default all endpoints will be cached, alternative options are "remote" for only caching non localhost endpoints and "<regex>"

crates/config/src/lib.rs

@@ -318,6 +318,8 @@ pub struct Config {
     /// If set to true, changes compilation pipeline to go through the Yul intermediate
     /// representation.
     pub via_ir: bool,
+    /// Whether to include the AST as JSON in the compiler output.
+    pub ast: bool,
     /// RPC storage caching settings determines what chains and endpoints to cache
     pub rpc_storage_caching: StorageCachingConfig,
     /// Disables storage caching entirely. This overrides any settings made in
@@ -668,7 +670,7 @@ impl Config {
             .set_auto_detect(self.is_auto_detect())
             .set_offline(self.offline)
             .set_cached(cached)
-            .set_build_info(cached & self.build_info)
+            .set_build_info(cached && self.build_info)
             .set_no_artifacts(no_artifacts)
             .build()?;
 
@@ -768,7 +770,7 @@ impl Config {
             .tests(&self.test)
             .scripts(&self.script)
             .artifacts(&self.out)
-            .libs(self.libs.clone())
+            .libs(self.libs.iter())
             .remappings(self.get_all_remappings());
 
         if let Some(build_info_path) = &self.build_info_path {
@@ -796,8 +798,8 @@ impl Config {
     /// contracts/tokens/token.sol
     /// contracts/math/math.sol
     /// ```
-    pub fn get_all_remappings(&self) -> Vec<Remapping> {
-        self.remappings.iter().map(|m| m.clone().into()).collect()
+    pub fn get_all_remappings(&self) -> impl Iterator<Item = Remapping> + '_ {
+        self.remappings.iter().map(|m| m.clone().into())
     }
 
     /// Returns the configured rpc jwt secret
@@ -1025,6 +1027,7 @@ impl Config {
     /// `extra_output` fields
     pub fn configured_artifacts_handler(&self) -> ConfigurableArtifacts {
         let mut extra_output = self.extra_output.clone();
+
         // Sourcify verification requires solc metadata output. Since, it doesn't
         // affect the UX & performance of the compiler, output the metadata files
         // by default.
@@ -1034,7 +1037,7 @@ impl Config {
             extra_output.push(ContractOutputSelection::Metadata);
         }
 
-        ConfigurableArtifacts::new(extra_output, self.extra_output_files.clone())
+        ConfigurableArtifacts::new(extra_output, self.extra_output_files.iter().cloned())
     }
 
     /// Parses all libraries in the form of
@@ -1043,45 +1046,54 @@ impl Config {
         Libraries::parse(&self.libraries)
     }
 
+    /// Returns all libraries with applied remappings. Same as `self.solc_settings()?.libraries`.
+    pub fn libraries_with_remappings(&self) -> Result<Libraries, SolcError> {
+        Ok(self.parsed_libraries()?.with_applied_remappings(&self.project_paths()))
+    }
+
     /// Returns the configured `solc` `Settings` that includes:
-    ///   - all libraries
-    ///   - the optimizer (including details, if configured)
-    ///   - evm version
+    /// - all libraries
+    /// - the optimizer (including details, if configured)
+    /// - evm version
     pub fn solc_settings(&self) -> Result<Settings, SolcError> {
-        let libraries = self.parsed_libraries()?.with_applied_remappings(&self.project_paths());
-        let optimizer = self.optimizer();
-
         // By default if no targets are specifically selected the model checker uses all targets.
         // This might be too much here, so only enable assertion checks.
         // If users wish to enable all options they need to do so explicitly.
         let mut model_checker = self.model_checker.clone();
-        if let Some(ref mut model_checker_settings) = model_checker {
+        if let Some(model_checker_settings) = &mut model_checker {
             if model_checker_settings.targets.is_none() {
                 model_checker_settings.targets = Some(vec![ModelCheckerTarget::Assert]);
             }
         }
 
         let mut settings = Settings {
-            optimizer,
+            libraries: self.libraries_with_remappings()?,
+            optimizer: self.optimizer(),
             evm_version: Some(self.evm_version),
-            libraries,
             metadata: Some(SettingsMetadata {
                 use_literal_content: Some(self.use_literal_content),
                 bytecode_hash: Some(self.bytecode_hash),
                 cbor_metadata: Some(self.cbor_metadata),
             }),
             debug: self.revert_strings.map(|revert_strings| DebuggingSettings {
                 revert_strings: Some(revert_strings),
+                // Not used.
                 debug_info: Vec::new(),
             }),
             model_checker,
-            ..Default::default()
+            via_ir: Some(self.via_ir),
+            // Not used.
+            stop_after: None,
+            // Set in project paths.
+            remappings: Vec::new(),
+            // Set with `with_extra_output` below.
+            output_selection: Default::default(),
         }
-        .with_extra_output(self.configured_artifacts_handler().output_selection())
-        .with_ast();
+        .with_extra_output(self.configured_artifacts_handler().output_selection());
 
-        if self.via_ir {
-            settings = settings.with_via_ir();
+        // We're keeping AST in `--build-info` for backwards compatibility with HardHat.
+        if self.ast || self.build_info {
+            settings = settings.with_ast();
         }
 
         Ok(settings)
@@ -1874,6 +1886,7 @@ impl Default for Config {
             ignored_file_paths: vec![],
             deny_warnings: false,
             via_ir: false,
+            ast: false,
             rpc_storage_caching: Default::default(),
             rpc_endpoints: Default::default(),
             etherscan: Default::default(),
@@ -2882,7 +2895,7 @@ mod tests {
 
             // contains additional remapping to the source dir
             assert_eq!(
-                config.get_all_remappings(),
+                config.get_all_remappings().collect::<Vec<_>>(),
                 vec![
                     Remapping::from_str("ds-test/=lib/ds-test/src/").unwrap(),
                     Remapping::from_str("env-lib/=lib/env-lib/").unwrap(),

crates/forge/bin/cmd/coverage.rs

@@ -88,6 +88,9 @@ impl CoverageArgs {
         // Set fuzz seed so coverage reports are deterministic
         config.fuzz.seed = Some(U256::from_be_bytes(STATIC_FUZZ_SEED));
 
+        // Coverage analysis requires the Solc AST output.
+        config.ast = true;
+
         let (project, output) = self.build(&config)?;
         p_println!(!self.opts.silent => "Analysing contracts...");
         let report = self.prepare(&config, output.clone())?;
@@ -99,47 +102,41 @@ impl CoverageArgs {
     /// Builds the project.
     fn build(&self, config: &Config) -> Result<(Project, ProjectCompileOutput)> {
         // Set up the project
-        let project = {
-            let mut project = config.ephemeral_no_artifacts_project()?;
-
-            if self.ir_minimum {
-                // TODO: How to detect solc version if the user does not specify a solc version in
-                // config  case1: specify local installed solc ?
-                //  case2: multiple solc versions used and  auto_detect_solc == true
-                if let Some(SolcReq::Version(version)) = &config.solc {
-                    if *version < Version::new(0, 8, 13) {
-                        return Err(eyre::eyre!(
+        let mut project = config.ephemeral_no_artifacts_project()?;
+        if self.ir_minimum {
+            // TODO: How to detect solc version if the user does not specify a solc version in
+            // config  case1: specify local installed solc ?
+            //  case2: multiple solc versions used and  auto_detect_solc == true
+            if let Some(SolcReq::Version(version)) = &config.solc {
+                if *version < Version::new(0, 8, 13) {
+                    return Err(eyre::eyre!(
                             "viaIR with minimum optimization is only available in Solidity 0.8.13 and above."
                         ));
-                    }
                 }
+            }
 
-                // print warning message
-                p_println!(!self.opts.silent => "{}",
-                Paint::yellow(
-                concat!(
-                "Warning! \"--ir-minimum\" flag enables viaIR with minimum optimization, which can result in inaccurate source mappings.\n",
+            // print warning message
+            let msg = Paint::yellow(concat!(
+                "Warning! \"--ir-minimum\" flag enables viaIR with minimum optimization, \
+                 which can result in inaccurate source mappings.\n",
                 "Only use this flag as a workaround if you are experiencing \"stack too deep\" errors.\n",
                 "Note that \"viaIR\" is only available in Solidity 0.8.13 and above.\n",
-                "See more:\n",
-                "https://github.com/foundry-rs/foundry/issues/3357\n"
-                )));
-
-                // Enable viaIR with minimum optimization
-                // https://github.com/ethereum/solidity/issues/12533#issuecomment-1013073350
-                // And also in new releases of solidity:
-                // https://github.com/ethereum/solidity/issues/13972#issuecomment-1628632202
-                project.solc_config.settings =
-                    project.solc_config.settings.with_via_ir_minimum_optimization()
-            } else {
-                project.solc_config.settings.optimizer.disable();
-                project.solc_config.settings.optimizer.runs = None;
-                project.solc_config.settings.optimizer.details = None;
-                project.solc_config.settings.via_ir = None;
-            }
-
-            project
-        };
+                "See more: https://github.com/foundry-rs/foundry/issues/3357",
+            ));
+            p_println!(!self.opts.silent => "{msg}");
+
+            // Enable viaIR with minimum optimization
+            // https://github.com/ethereum/solidity/issues/12533#issuecomment-1013073350
+            // And also in new releases of solidity:
+            // https://github.com/ethereum/solidity/issues/13972#issuecomment-1628632202
+            project.solc_config.settings =
+                project.solc_config.settings.with_via_ir_minimum_optimization()
+        } else {
+            project.solc_config.settings.optimizer.disable();
+            project.solc_config.settings.optimizer.runs = None;
+            project.solc_config.settings.optimizer.details = None;
+            project.solc_config.settings.via_ir = None;
+        }
 
         let output = ProjectCompiler::default()
             .compile(&project)?

crates/forge/bin/cmd/flatten.rs

@@ -36,13 +36,12 @@ impl FlattenArgs {
 
         // flatten is a subset of `BuildArgs` so we can reuse that to get the config
         let build_args = CoreBuildArgs { project_paths, ..Default::default() };
-
-        let config = build_args.try_load_config_emit_warnings()?;
-
-        let target_path = dunce::canonicalize(target_path)?;
-
+        let mut config = build_args.try_load_config_emit_warnings()?;
+        // `Flattener` uses the typed AST for better flattening results.
+        config.ast = true;
         let project = config.ephemeral_no_artifacts_project()?;
 
+        let target_path = dunce::canonicalize(target_path)?;
         let compiler_output = ProjectCompiler::new().files([target_path.clone()]).compile(&project);
 
         let flattened = match compiler_output {