Auto merge of #76558 - tmandry:rollup-bskim2r, r=tmandry

Rollup of 7 pull requests

Successful merges:

 - #74787 (Move `rustllvm` into `compiler/rustc_llvm`)
 - #76458 (Add drain_filter method to HashMap and HashSet)
 - #76472 (rustbuild: don't set PYTHON_EXECUTABLE and WITH_POLLY cmake vars since they are no longer supported by llvm)
 - #76497 (Use intra-doc links in `core::ptr`)
 - #76500 (Add -Zgraphviz_dark_mode and monospace font fix)
 - #76543 (Document btree's unwrap_unchecked)
 - #76556 (Revert #76285)

Failed merges:

r? `@ghost`

1 files changed, 70 insertions, 0 deletions

diff --git a/compiler/rustc_llvm/llvm-wrapper/CoverageMappingWrapper.cpp b/compiler/rustc_llvm/llvm-wrapper/CoverageMappingWrapper.cpp
new file mode 100644
index 00000000000..2b1143a4ecf
--- /dev/null
+++ b/compiler/rustc_llvm/llvm-wrapper/CoverageMappingWrapper.cpp
@@ -0,0 +1,70 @@
+#include "LLVMWrapper.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;
+}