Adding GetILForModule cDAC API

[rcj1]

A couple comments on this one:

• I am assuming that IsMapped() is always true, excluding ReflectionEmit methods.
• I am also omitting the checks here; they don't seem important for the read-only dumping of IL and they would add a decent amount of complexity to the descriptor and contracts.
  • The first check validates various alignment and flags; to me they look superfluous for read-only operation.
  • The second check ensures that the RVA is valid within the PE file. We omit a check for the IL size in the existing DAC code; it seems we have accepted the risk of this leading to failure on a ReadVirtual if the given size is incorrect/corrupted.

[Copilot]

Pull Request Overview

This PR implements the GetILForModule cDAC API, which retrieves the address of IL (Intermediate Language) code for a given module and relative virtual address (RVA). The implementation replaces a placeholder that delegated to legacy code with a full cDAC-based solution.

Key changes:

• Adds complete implementation of GetILForModule in SOSDacImpl with proper parameter validation and error handling
• Introduces new GetILAddr method in the ILoader contract to calculate IL addresses from PE assembly data
• Includes DEBUG-only verification against legacy implementation to ensure compatibility

Reviewed Changes

Copilot reviewed 3 out of 3 changed files in this pull request and generated 1 comment.

File	Description
SOSDacImpl.cs	Replaces placeholder with full GetILForModule implementation including validation, error handling, and debug verification
Loader_1.cs	Implements GetILAddr method to calculate IL addresses by traversing PE assembly, image, and layout structures
ILoader.cs	Adds GetILAddr method signature to the ILoader contract interface

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[jkotas]

I am assuming that IsMapped() is always true, excluding ReflectionEmit methods.

That's only true on Windows for files loaded from disk.

IsMapped is typically false on non-Windows for non-R2R binaries. Also, it is likely false for binaries loaded from memory (e.g. using Assembly.Load(byte[]) API) on all platforms.