Rollup merge of #74787 - petrochenkov:rustllvm, r=cuviper

Move `rustllvm` into `compiler/rustc_llvm`

The `rustllvm` directory is not self-contained, it contains C++ code built by a build script of the `rustc_llvm` crate which is then linked into that crate.
So it makes sense to make `rustllvm` a part of `rustc_llvm` and move it into its directory.
I replaced `rustllvm` with more obvious `llvm-wrapper` as the subdirectory name, but something like `llvm-adapter` would work as well, other suggestions are welcome.

To make things more confusing, the Rust side of FFI functions defined in `rustllvm` can be found in `rustc_codegen_llvm` rather than in `rustc_llvm`. Perhaps they need to be moved as well, but this PR doesn't do that.

The presence of multiple LLVM-related directories in `src` (`llvm-project`, `rustllvm`, `librustc_llvm`, `librustc_codegen_llvm` and their predecessors) historically confused me and made me wonder about their purpose.
With this PR we will have LLVM itself (`llvm-project`), a FFI crate (`rustc_llvm`, kind of `llvm-sys`) and a codegen backend crate using LLVM through the FFI crate (`rustc_codegen_llvm`).

1 files changed, 0 insertions, 70 deletions

diff --git a/src/rustllvm/CoverageMappingWrapper.cpp b/src/rustllvm/CoverageMappingWrapper.cpp
deleted file mode 100644
index 81aba0cbf7d..00000000000
--- a/src/rustllvm/CoverageMappingWrapper.cpp
+++ /dev/null
@@ -1,70 +0,0 @@
-#include "rustllvm.h"
-#include "llvm/ProfileData/Coverage/CoverageMapping.h"
-#include "llvm/ProfileData/Coverage/CoverageMappingWriter.h"
-#include "llvm/ProfileData/InstrProf.h"
-#include "llvm/ADT/ArrayRef.h"
-#include "llvm/Support/LEB128.h"
-
-#include <iostream>
-
-using namespace llvm;
-
-extern "C" void LLVMRustCoverageWriteFilenamesSectionToBuffer(
-    const char* const Filenames[],
-    size_t FilenamesLen,
-    RustStringRef BufferOut) {
-  // LLVM 11's CoverageFilenamesSectionWriter uses its new `Version4` format,
-  // so we're manually writing the `Version3` format ourselves.
-  RawRustStringOstream OS(BufferOut);
-  encodeULEB128(FilenamesLen, OS);
-  for (size_t i = 0; i < FilenamesLen; i++) {
-    StringRef Filename(Filenames[i]);
-    encodeULEB128(Filename.size(), OS);
-    OS << Filename;
-  }
-}
-
-extern "C" void LLVMRustCoverageWriteMappingToBuffer(
-    const unsigned *VirtualFileMappingIDs,
-    unsigned NumVirtualFileMappingIDs,
-    const coverage::CounterExpression *Expressions,
-    unsigned NumExpressions,
-    coverage::CounterMappingRegion *MappingRegions,
-    unsigned NumMappingRegions,
-    RustStringRef BufferOut) {
-  auto CoverageMappingWriter = coverage::CoverageMappingWriter(
-      makeArrayRef(VirtualFileMappingIDs, NumVirtualFileMappingIDs),
-      makeArrayRef(Expressions, NumExpressions),
-      makeMutableArrayRef(MappingRegions, NumMappingRegions));
-  RawRustStringOstream OS(BufferOut);
-  CoverageMappingWriter.write(OS);
-}
-
-extern "C" LLVMValueRef LLVMRustCoverageCreatePGOFuncNameVar(LLVMValueRef F, const char *FuncName) {
-  StringRef FuncNameRef(FuncName);
-  return wrap(createPGOFuncNameVar(*cast<Function>(unwrap(F)), FuncNameRef));
-}
-
-extern "C" uint64_t LLVMRustCoverageComputeHash(const char *Name) {
-  StringRef NameRef(Name);
-  return IndexedInstrProf::ComputeHash(NameRef);
-}
-
-extern "C" void LLVMRustCoverageWriteSectionNameToString(LLVMModuleRef M,
-                                                         RustStringRef Str) {
-  Triple TargetTriple(unwrap(M)->getTargetTriple());
-  auto name = getInstrProfSectionName(IPSK_covmap,
-                                      TargetTriple.getObjectFormat());
-  RawRustStringOstream OS(Str);
-  OS << name;
-}
-
-extern "C" void LLVMRustCoverageWriteMappingVarNameToString(RustStringRef Str) {
-  auto name = getCoverageMappingVarName();
-  RawRustStringOstream OS(Str);
-  OS << name;
-}
-
-extern "C" uint32_t LLVMRustCoverageMappingVersion() {
-  return coverage::CovMapVersion::Version3;
-}