compiler/rustc_llvm/llvm-wrapper/CoverageMappingWrapper.cpp

   1 #include "LLVMWrapper.h"
   2 #include "llvm/ProfileData/Coverage/CoverageMapping.h"
   3 #include "llvm/ProfileData/Coverage/CoverageMappingWriter.h"
   4 #include "llvm/ProfileData/InstrProf.h"
   5 #include "llvm/ADT/ArrayRef.h"
   6
   7 #include <iostream>
   8
   9 using namespace llvm;
  10
  11 struct LLVMRustCounterMappingRegion {
  12   coverage::Counter Count;
  13   uint32_t FileID;
  14   uint32_t ExpandedFileID;
  15   uint32_t LineStart;
  16   uint32_t ColumnStart;
  17   uint32_t LineEnd;
  18   uint32_t ColumnEnd;
  19   coverage::CounterMappingRegion::RegionKind Kind;
  20 };
  21
  22 extern "C" void LLVMRustCoverageWriteFilenamesSectionToBuffer(
  23     const char* const Filenames[],
  24     size_t FilenamesLen,
  25     RustStringRef BufferOut) {
  26   SmallVector<StringRef,32> FilenameRefs;
  27   for (size_t i = 0; i < FilenamesLen; i++) {
  28     FilenameRefs.push_back(StringRef(Filenames[i]));
  29   }
  30   auto FilenamesWriter = coverage::CoverageFilenamesSectionWriter(
  31     makeArrayRef(FilenameRefs));
  32   RawRustStringOstream OS(BufferOut);
  33   FilenamesWriter.write(OS);
  34 }
  35
  36 extern "C" void LLVMRustCoverageWriteMappingToBuffer(
  37     const unsigned *VirtualFileMappingIDs,
  38     unsigned NumVirtualFileMappingIDs,
  39     const coverage::CounterExpression *Expressions,
  40     unsigned NumExpressions,
  41     LLVMRustCounterMappingRegion *RustMappingRegions,
  42     unsigned NumMappingRegions,
  43     RustStringRef BufferOut) {
  44   // Convert from FFI representation to LLVM representation.
  45   SmallVector<coverage::CounterMappingRegion, 0> MappingRegions;
  46   MappingRegions.reserve(NumMappingRegions);
  47   for (const auto &Region : makeArrayRef(RustMappingRegions, NumMappingRegions)) {
  48     MappingRegions.emplace_back(
  49         Region.Count, Region.FileID, Region.ExpandedFileID,
  50         Region.LineStart, Region.ColumnStart, Region.LineEnd, Region.ColumnEnd,
  51         Region.Kind);
  52   }
  53   auto CoverageMappingWriter = coverage::CoverageMappingWriter(
  54       makeArrayRef(VirtualFileMappingIDs, NumVirtualFileMappingIDs),
  55       makeArrayRef(Expressions, NumExpressions),
  56       MappingRegions);
  57   RawRustStringOstream OS(BufferOut);
  58   CoverageMappingWriter.write(OS);
  59 }
  60
  61 extern "C" LLVMValueRef LLVMRustCoverageCreatePGOFuncNameVar(LLVMValueRef F, const char *FuncName) {
  62   StringRef FuncNameRef(FuncName);
  63   return wrap(createPGOFuncNameVar(*cast<Function>(unwrap(F)), FuncNameRef));
  64 }
  65
  66 extern "C" uint64_t LLVMRustCoverageHashCString(const char *StrVal) {
  67   StringRef StrRef(StrVal);
  68   return IndexedInstrProf::ComputeHash(StrRef);
  69 }
  70
  71 extern "C" uint64_t LLVMRustCoverageHashByteArray(
  72     const char *Bytes,
  73     unsigned NumBytes) {
  74   StringRef StrRef(Bytes, NumBytes);
  75   return IndexedInstrProf::ComputeHash(StrRef);
  76 }
  77
  78 static void WriteSectionNameToString(LLVMModuleRef M,
  79                                      InstrProfSectKind SK,
  80                                      RustStringRef Str) {
  81   Triple TargetTriple(unwrap(M)->getTargetTriple());
  82   auto name = getInstrProfSectionName(SK, TargetTriple.getObjectFormat());
  83   RawRustStringOstream OS(Str);
  84   OS << name;
  85 }
  86
  87 extern "C" void LLVMRustCoverageWriteMapSectionNameToString(LLVMModuleRef M,
  88                                                             RustStringRef Str) {
  89   WriteSectionNameToString(M, IPSK_covmap, Str);
  90 }
  91
  92 extern "C" void LLVMRustCoverageWriteFuncSectionNameToString(LLVMModuleRef M,
  93                                                              RustStringRef Str) {
  94 #if LLVM_VERSION_GE(11, 0)
  95   WriteSectionNameToString(M, IPSK_covfun, Str);
  96 // else do nothing; the `Version` check will abort codegen on the Rust side
  97 #endif
  98 }
  99
 100 extern "C" void LLVMRustCoverageWriteMappingVarNameToString(RustStringRef Str) {
 101   auto name = getCoverageMappingVarName();
 102   RawRustStringOstream OS(Str);
 103   OS << name;
 104 }
 105
 106 extern "C" uint32_t LLVMRustCoverageMappingVersion() {
 107 #if LLVM_VERSION_GE(11, 0)
 108   return coverage::CovMapVersion::Version4;
 109 #else
 110   return coverage::CovMapVersion::Version3;
 111 #endif
 112 }