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#include "LLVMWrapper.h"
#include "llvm/ADT/ArrayRef.h"
#include "llvm/ADT/SmallVector.h"
#include "llvm/ADT/StringRef.h"
#include "llvm/IR/Module.h"
#include "llvm/ProfileData/Coverage/CoverageMapping.h"
#include "llvm/ProfileData/Coverage/CoverageMappingWriter.h"
#include "llvm/ProfileData/InstrProf.h"
using namespace llvm;
// FFI equivalent of enum `llvm::coverage::Counter::CounterKind`
// https://github.com/rust-lang/llvm-project/blob/ea6fa9c2/llvm/include/llvm/ProfileData/Coverage/CoverageMapping.h#L97-L99
enum class LLVMRustCounterKind {
Zero = 0,
CounterValueReference = 1,
Expression = 2,
};
// FFI equivalent of struct `llvm::coverage::Counter`
// https://github.com/rust-lang/llvm-project/blob/ea6fa9c2/llvm/include/llvm/ProfileData/Coverage/CoverageMapping.h#L94-L149
struct LLVMRustCounter {
LLVMRustCounterKind CounterKind;
uint32_t ID;
};
static coverage::Counter fromRust(LLVMRustCounter Counter) {
switch (Counter.CounterKind) {
case LLVMRustCounterKind::Zero:
return coverage::Counter::getZero();
case LLVMRustCounterKind::CounterValueReference:
return coverage::Counter::getCounter(Counter.ID);
case LLVMRustCounterKind::Expression:
return coverage::Counter::getExpression(Counter.ID);
}
report_fatal_error("Bad LLVMRustCounterKind!");
}
// Must match the layout of
// `rustc_codegen_llvm::coverageinfo::ffi::CoverageSpan`.
struct LLVMRustCoverageSpan {
uint32_t FileID;
uint32_t LineStart;
uint32_t ColumnStart;
uint32_t LineEnd;
uint32_t ColumnEnd;
};
// Must match the layout of `rustc_codegen_llvm::coverageinfo::ffi::CodeRegion`.
struct LLVMRustCoverageCodeRegion {
LLVMRustCoverageSpan Span;
LLVMRustCounter Count;
};
// Must match the layout of
// `rustc_codegen_llvm::coverageinfo::ffi::ExpansionRegion`.
struct LLVMRustCoverageExpansionRegion {
LLVMRustCoverageSpan Span;
uint32_t ExpandedFileID;
};
// Must match the layout of
// `rustc_codegen_llvm::coverageinfo::ffi::BranchRegion`.
struct LLVMRustCoverageBranchRegion {
LLVMRustCoverageSpan Span;
LLVMRustCounter TrueCount;
LLVMRustCounter FalseCount;
};
// FFI equivalent of enum `llvm::coverage::CounterExpression::ExprKind`
// https://github.com/rust-lang/llvm-project/blob/ea6fa9c2/llvm/include/llvm/ProfileData/Coverage/CoverageMapping.h#L154
enum class LLVMRustCounterExprKind {
Subtract = 0,
Add = 1,
};
// FFI equivalent of struct `llvm::coverage::CounterExpression`
// https://github.com/rust-lang/llvm-project/blob/ea6fa9c2/llvm/include/llvm/ProfileData/Coverage/CoverageMapping.h#L151-L160
struct LLVMRustCounterExpression {
LLVMRustCounterExprKind Kind;
LLVMRustCounter LHS;
LLVMRustCounter RHS;
};
static coverage::CounterExpression::ExprKind
fromRust(LLVMRustCounterExprKind Kind) {
switch (Kind) {
case LLVMRustCounterExprKind::Subtract:
return coverage::CounterExpression::Subtract;
case LLVMRustCounterExprKind::Add:
return coverage::CounterExpression::Add;
}
report_fatal_error("Bad LLVMRustCounterExprKind!");
}
extern "C" void LLVMRustCoverageWriteFilenamesToBuffer(
const char *const Filenames[], size_t FilenamesLen, // String start pointers
const size_t *const Lengths, size_t LengthsLen, // Corresponding lengths
RustStringRef BufferOut) {
if (FilenamesLen != LengthsLen) {
report_fatal_error(
"Mismatched lengths in LLVMRustCoverageWriteFilenamesToBuffer");
}
SmallVector<std::string, 32> FilenameRefs;
FilenameRefs.reserve(FilenamesLen);
for (size_t i = 0; i < FilenamesLen; i++) {
FilenameRefs.emplace_back(Filenames[i], Lengths[i]);
}
auto FilenamesWriter = coverage::CoverageFilenamesSectionWriter(
ArrayRef<std::string>(FilenameRefs));
auto OS = RawRustStringOstream(BufferOut);
FilenamesWriter.write(OS);
}
extern "C" void LLVMRustCoverageWriteFunctionMappingsToBuffer(
const unsigned *VirtualFileMappingIDs, size_t NumVirtualFileMappingIDs,
const LLVMRustCounterExpression *RustExpressions, size_t NumExpressions,
const LLVMRustCoverageCodeRegion *CodeRegions, size_t NumCodeRegions,
const LLVMRustCoverageExpansionRegion *ExpansionRegions,
size_t NumExpansionRegions,
const LLVMRustCoverageBranchRegion *BranchRegions, size_t NumBranchRegions,
RustStringRef BufferOut) {
// Convert from FFI representation to LLVM representation.
// Expressions:
std::vector<coverage::CounterExpression> Expressions;
Expressions.reserve(NumExpressions);
for (const auto &Expression :
ArrayRef<LLVMRustCounterExpression>(RustExpressions, NumExpressions)) {
Expressions.emplace_back(fromRust(Expression.Kind),
fromRust(Expression.LHS),
fromRust(Expression.RHS));
}
std::vector<coverage::CounterMappingRegion> MappingRegions;
MappingRegions.reserve(NumCodeRegions + NumExpansionRegions +
NumBranchRegions);
// Code regions:
for (const auto &Region : ArrayRef(CodeRegions, NumCodeRegions)) {
MappingRegions.push_back(coverage::CounterMappingRegion::makeRegion(
fromRust(Region.Count), Region.Span.FileID, Region.Span.LineStart,
Region.Span.ColumnStart, Region.Span.LineEnd, Region.Span.ColumnEnd));
}
// Expansion regions:
for (const auto &Region : ArrayRef(ExpansionRegions, NumExpansionRegions)) {
MappingRegions.push_back(coverage::CounterMappingRegion::makeExpansion(
Region.Span.FileID, Region.ExpandedFileID, Region.Span.LineStart,
Region.Span.ColumnStart, Region.Span.LineEnd, Region.Span.ColumnEnd));
}
// Branch regions:
for (const auto &Region : ArrayRef(BranchRegions, NumBranchRegions)) {
MappingRegions.push_back(coverage::CounterMappingRegion::makeBranchRegion(
fromRust(Region.TrueCount), fromRust(Region.FalseCount),
Region.Span.FileID, Region.Span.LineStart, Region.Span.ColumnStart,
Region.Span.LineEnd, Region.Span.ColumnEnd));
}
// Write the converted expressions and mappings to a byte buffer.
auto CoverageMappingWriter = coverage::CoverageMappingWriter(
ArrayRef<unsigned>(VirtualFileMappingIDs, NumVirtualFileMappingIDs),
Expressions, MappingRegions);
auto OS = RawRustStringOstream(BufferOut);
CoverageMappingWriter.write(OS);
}
extern "C" LLVMValueRef
LLVMRustCoverageCreatePGOFuncNameVar(LLVMValueRef F, const char *FuncName,
size_t FuncNameLen) {
auto FuncNameRef = StringRef(FuncName, FuncNameLen);
return wrap(createPGOFuncNameVar(*cast<Function>(unwrap(F)), FuncNameRef));
}
extern "C" uint64_t LLVMRustCoverageHashBytes(const char *Bytes,
size_t NumBytes) {
return IndexedInstrProf::ComputeHash(StringRef(Bytes, NumBytes));
}
// Private helper function for getting the covmap and covfun section names.
static void writeInstrProfSectionNameToString(LLVMModuleRef M,
InstrProfSectKind SectKind,
RustStringRef OutStr) {
auto TargetTriple = Triple(unwrap(M)->getTargetTriple());
auto name = getInstrProfSectionName(SectKind, TargetTriple.getObjectFormat());
auto OS = RawRustStringOstream(OutStr);
OS << name;
}
extern "C" void
LLVMRustCoverageWriteCovmapSectionNameToString(LLVMModuleRef M,
RustStringRef OutStr) {
writeInstrProfSectionNameToString(M, IPSK_covmap, OutStr);
}
extern "C" void
LLVMRustCoverageWriteCovfunSectionNameToString(LLVMModuleRef M,
RustStringRef OutStr) {
writeInstrProfSectionNameToString(M, IPSK_covfun, OutStr);
}
extern "C" void
LLVMRustCoverageWriteCovmapVarNameToString(RustStringRef OutStr) {
auto name = getCoverageMappingVarName();
auto OS = RawRustStringOstream(OutStr);
OS << name;
}
extern "C" uint32_t LLVMRustCoverageMappingVersion() {
// This should always be `CurrentVersion`, because that's the version LLVM
// will use when encoding the data we give it. If for some reason we ever
// want to override the version number we _emit_, do it on the Rust side.
return coverage::CovMapVersion::CurrentVersion;
}
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