fallow-engine 3.5.1

Typed analysis engine facade for fallow consumers
Documentation 
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//! Symbol trace types exposed through the engine boundary.

use fallow_config::ResolvedConfig;

use crate::{EngineError, EngineResult, session::AnalysisSession};

use fallow_types::trace_chain::{SymbolChainQuery, SymbolChainTrace};

#[expect(
    unused_imports,
    reason = "engine owns a copied trace-chain implementation whose internal pub uses serve its tests"
)]
#[path = "trace_chain_impl.rs"]
mod trace_chain_impl;

/// Run symbol-level call-chain tracing through the engine boundary.
///
/// # Errors
///
/// Returns an error if parsing, graph construction, or retained module
/// analysis fails.
pub fn trace_symbol_chain(
    config: &ResolvedConfig,
    query: SymbolChainQuery<'_>,
) -> EngineResult<Option<SymbolChainTrace>> {
    let session = AnalysisSession::from_resolved_config(config.clone());
    trace_symbol_chain_with_session(&session, query)
}

/// Run symbol-level call-chain tracing through an existing analysis session.
///
/// # Errors
///
/// Returns an error if parsing, graph construction, or retained module
/// analysis fails.
pub fn trace_symbol_chain_with_session(
    session: &AnalysisSession,
    query: SymbolChainQuery<'_>,
) -> EngineResult<Option<SymbolChainTrace>> {
    let output = session.analyze_dead_code_with_shared_artifacts(true, true)?;
    let graph = output
        .graph
        .as_ref()
        .ok_or_else(|| EngineError::new("trace requires a retained module graph"))?;
    let modules = output.modules.as_deref().unwrap_or(&[]);
    Ok(trace_chain_impl::trace_symbol_chain(
        graph.as_graph(),
        modules,
        session.root(),
        query,
    ))
}