[DWARFLinker] Use DIEEntry for backward ref_addr references (#181881) The classic DWARF linker avoids `DIEEntry` for `DW_FORM_ref_addr` references, using raw `DIEInteger` values with manual offset computation instead. A stale FIXME explains this was because "the implementation calls back to DwarfDebug to find the unit offset", but this is no longer true. `DIEEntry` resolves offsets via `DIEUnit::getDebugSectionOffset()`, which has no `DwarfDebug` dependency. And the real constraint is that forward references may point to placeholder `DIEs` that never get adopted into a unit tree (due toODR pruning), so `DIEEntry` cannot resolve them(a test failed during refactoring this). However, backward references are safe, the target DIE is already cloned and parented in a unit tree.
Welcome to the LLVM project!
This repository contains the source code for LLVM, a toolkit for the construction of highly optimized compilers, optimizers, and run-time environments.
The LLVM project has multiple components. The core of the project is itself called “LLVM”. This contains all of the tools, libraries, and header files needed to process intermediate representations and convert them into object files. Tools include an assembler, disassembler, bitcode analyzer, and bitcode optimizer.
C-like languages use the Clang frontend. This component compiles C, C++, Objective-C, and Objective-C++ code into LLVM bitcode -- and from there into object files, using LLVM.
Other components include: the libc++ C++ standard library, the LLD linker, and more.
Consult the Getting Started with LLVM page for information on building and running LLVM.
For information on how to contribute to the LLVM project, please take a look at the Contributing to LLVM guide.
Join the LLVM Discourse forums, Discord chat, LLVM Office Hours or Regular sync-ups.
The LLVM project has adopted a code of conduct for participants to all modes of communication within the project.