Module clang 

The clang backend provided by squid.

This backend generates C code from the functions in the process image, compiles the C code with clang as a shared object file and loads that via dlopen() into the address space. We take little detour over clang to get the best possible LLVM codegen and thus the best performance.

Our original idea was to just emit the LLVM IR ourselves but no LLVM frontend is as good as clang anyways and C is a lot easier to generate than the LLVM IR, so this solution was less work and yielded better results.

Modules

perms

The permission bits used by the ClangBackend

Structs

ClangBackend

The ClangBackend generates C code from the code in the process image and compiles that with clang for optimal codegen. It constructs the ClangRuntime.

ClangBackendBuilder

The ClangBackendBuilder configures the ClangBackend with the values that you provide. Use the ClangBackend::builder method to create this builder.

ClangRuntime

The ClangRuntime gives you access to registers, memory, the event channel and the AOT-compiled code of the ClangBackend.

HeapChunk

The HeapChunk represents a single chunk on the heap of the runtime.

Symbol

The Symbols in the ClangRuntime are constructed from the symbols in the process image except that there is one runtime Symbol for every private + public name of a process image symbol.

Enums

AOTReturnCode

The raw return code of the “AOT”, i.e. the AOT-compiled C code.

CLifterError

This error type represents everything that can go wrong when generating C code.

ClangBackendError

This error shows everything that can go wrong during the operations of the ClangBackend.

ClangRuntimeFault

This type shows all errors that can occur during runtime

HeapError

The HeapError shows everything that can go wrong when operating with the heap.

SymbolType

The type of a symbol in the runtime’s symbol store

SymbolVisibility

The visibility of a symbol in the runtime’s symbol store