dotscope 0.6.0

A high-performance, cross-platform framework for analyzing and reverse engineering .NET PE executables
Documentation 
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//! `LocalScope` table loader for metadata processing
//!
//! This module provides the [`LocalScopeLoader`] implementation for processing
//! ``LocalScope`` 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 `LocalScope` metadata table
///
/// Implements [`MetadataLoader`] to process the `LocalScope` table (0x32)
/// which defines the scope ranges where local variables and constants are active
/// within methods in Portable PDB format. This loader handles the conversion from
/// raw binary data to structured scope metadata for debugging support.
///
/// # Processing Strategy
///
/// The loader uses parallel processing to efficiently handle large numbers of local
/// scope entries, resolving table references and building the complete scope
/// metadata map for quick runtime access during debugging operations.
///
/// # Dependencies
///
/// This loader depends on several other metadata tables that must be loaded first:
/// - `MethodDef`: For method references
/// - `ImportScope`: For namespace import context
/// - `LocalVariable`: For variable list references
/// - `LocalConstant`: For constant list references
///
/// # Reference
/// * [Portable PDB Format - LocalScope Table](https://github.com/dotnet/core/blob/main/Documentation/diagnostics/portable_pdb.md#localscope-table-0x32)
pub struct LocalScopeLoader;

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

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

            let Some(local_scope) = context.handle_result(
                row.to_owned(
                    context.method_def,
                    &context.import_scope,
                    &context.local_variable,
                    &context.local_constant,
                    table,
                ),
                DiagnosticCategory::Method,
                token_msg,
            )?
            else {
                return Ok(());
            };

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

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

    fn dependencies(&self) -> &'static [TableId] {
        &[
            TableId::MethodDef,
            TableId::ImportScope,
            TableId::LocalVariable,
            TableId::LocalConstant,
        ]
    }
}