dotscope 0.6.0

A high-performance, cross-platform framework for analyzing and reverse engineering .NET PE executables
Documentation 
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//! `LocalVariable` table loader for metadata processing
//!
//! This module provides the [`LocalVariableLoader`] implementation for processing
//! `LocalVariable` table data during metadata loading. The loader handles parallel
//! processing and integration with the broader loader context.

use crate::{
    metadata::{
        diagnostics::DiagnosticCategory,
        loader::{LoaderContext, MetadataLoader},
        tables::TableId,
    },
    Result,
};

/// Loader for the `LocalVariable` metadata table
///
/// Implements [`MetadataLoader`] to process the `LocalVariable` table (0x33)
/// which stores information about local variables within method scopes,
/// including their names, signatures, and attributes in Portable PDB format.
/// This loader handles the conversion from raw binary data to structured variable
/// metadata for debugging support.
///
/// # Processing Strategy
///
/// The loader uses parallel processing to efficiently handle large numbers of local
/// variable entries, resolving heap references and building the complete variable
/// metadata map for quick runtime access during debugging operations.
///
/// # Dependencies
///
/// This loader depends on the #Strings heap being available in the loader context
/// for resolving variable name strings.
///
/// # Reference
/// * [Portable PDB Format - LocalVariable Table](https://github.com/dotnet/core/blob/main/Documentation/diagnostics/portable_pdb.md#localvariable-table-0x33)
pub struct LocalVariableLoader;

impl MetadataLoader for LocalVariableLoader {
    fn load(&self, context: &LoaderContext) -> Result<()> {
        let (Some(header), Some(strings)) = (context.meta, context.strings) else {
            return Ok(());
        };
        let Some(table) = header.table::<crate::metadata::tables::LocalVariableRaw>() else {
            return Ok(());
        };

        table.par_iter().try_for_each(|row| {
            let token_msg = || format!("local variable 0x{:08x}", row.token.value());

            let Some(local_variable) = context.handle_result(
                row.to_owned(strings),
                DiagnosticCategory::Method,
                token_msg,
            )?
            else {
                return Ok(());
            };

            context
                .local_variable
                .insert(local_variable.token, local_variable);
            Ok(())
        })
    }

    fn table_id(&self) -> Option<TableId> {
        Some(TableId::LocalVariable)
    }

    fn dependencies(&self) -> &'static [TableId] {
        &[]
    }
}