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Use the regular code paths for interpreting. Add new instructions: `StartSpeculation` will reset the diagnostics pointers to `nullptr`, which will keep us from reporting any diagnostics during speculation. `EndSpeculation` will undo this. The rest depends on what `Emitter` we use. For `EvalEmitter`, we have no bytecode, so we implement `speculate()` by simply visiting the first argument of `__builtin_constant_p`. If the evaluation fails, we push a `0` on the stack, otherwise a `1`. For `ByteCodeEmitter`, add another instrucion called `BCP`, that interprets all the instructions following it until the next `EndSpeculation` instruction. If any of those instructions fails, we jump to the `EndLabel`, which brings us right before the `EndSpeculation`. We then push the result on the stack.
The LLVM Compiler Infrastructure
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.
Getting the Source Code and Building LLVM
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.
Getting in touch
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.