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llvm-project/llvm/lib/ProfileData/GCOV.cpp

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//===- GCOV.cpp - LLVM coverage tool --------------------------------------===//
//
// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
// See https://llvm.org/LICENSE.txt for license information.
// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
//
//===----------------------------------------------------------------------===//
//
// GCOV implements the interface to read and write coverage files that use
// 'gcov' format.
//
//===----------------------------------------------------------------------===//
#include "llvm/ProfileData/GCOV.h"
#include "llvm/ADT/STLExtras.h"
#include "llvm/Config/llvm-config.h"
#include "llvm/Demangle/Demangle.h"
#include "llvm/Support/Debug.h"
#include "llvm/Support/FileSystem.h"
#include "llvm/Support/Format.h"
#include "llvm/Support/MD5.h"
#include "llvm/Support/Path.h"
#include "llvm/Support/raw_ostream.h"
#include <algorithm>
#include <system_error>
#include <unordered_map>
using namespace llvm;
enum : uint32_t {
GCOV_ARC_ON_TREE = 1 << 0,
GCOV_ARC_FALLTHROUGH = 1 << 2,
GCOV_TAG_FUNCTION = 0x01000000,
GCOV_TAG_BLOCKS = 0x01410000,
GCOV_TAG_ARCS = 0x01430000,
GCOV_TAG_LINES = 0x01450000,
GCOV_TAG_COUNTER_ARCS = 0x01a10000,
// GCOV_TAG_OBJECT_SUMMARY superseded GCOV_TAG_PROGRAM_SUMMARY in GCC 9.
GCOV_TAG_OBJECT_SUMMARY = 0xa1000000,
GCOV_TAG_PROGRAM_SUMMARY = 0xa3000000,
};
namespace {
struct Summary {
Summary(StringRef Name) : Name(Name) {}
StringRef Name;
uint64_t lines = 0;
uint64_t linesExec = 0;
uint64_t branches = 0;
uint64_t branchesExec = 0;
uint64_t branchesTaken = 0;
};
struct LineInfo {
SmallVector<const GCOVBlock *, 1> blocks;
uint64_t count = 0;
bool exists = false;
};
struct SourceInfo {
StringRef filename;
SmallString<0> displayName;
std::vector<std::vector<const GCOVFunction *>> startLineToFunctions;
std::vector<LineInfo> lines;
bool ignored = false;
SourceInfo(StringRef filename) : filename(filename) {}
};
class Context {
public:
Context(const GCOV::Options &Options) : options(Options) {}
void print(StringRef filename, StringRef gcno, StringRef gcda,
GCOVFile &file);
private:
std::string getCoveragePath(StringRef filename, StringRef mainFilename) const;
void printFunctionDetails(const GCOVFunction &f, raw_ostream &os) const;
void printBranchInfo(const GCOVBlock &Block, uint32_t &edgeIdx,
raw_ostream &OS) const;
void printSummary(const Summary &summary, raw_ostream &os) const;
void collectFunction(GCOVFunction &f, Summary &summary);
void collectSourceLine(SourceInfo &si, Summary *summary, LineInfo &line,
size_t lineNum) const;
void collectSource(SourceInfo &si, Summary &summary) const;
void annotateSource(SourceInfo &si, const GCOVFile &file, StringRef gcno,
StringRef gcda, raw_ostream &os) const;
void printSourceToIntermediate(const SourceInfo &si, raw_ostream &os) const;
const GCOV::Options &options;
std::vector<SourceInfo> sources;
};
} // namespace
//===----------------------------------------------------------------------===//
// GCOVFile implementation.
/// readGCNO - Read GCNO buffer.
bool GCOVFile::readGCNO(GCOVBuffer &buf) {
if (!buf.readGCNOFormat())
return false;
if (!buf.readGCOVVersion(Version))
return false;
Checksum = buf.getWord();
if (Version >= GCOV::V900)
cwd = buf.getString();
if (Version >= GCOV::V800)
buf.getWord(); // hasUnexecutedBlocks
uint32_t tag, length;
GCOVFunction *fn;
while ((tag = buf.getWord())) {
if (!buf.readInt(length))
return false;
if (tag == GCOV_TAG_FUNCTION) {
functions.push_back(std::make_unique<GCOVFunction>(*this));
fn = functions.back().get();
fn->ident = buf.getWord();
fn->linenoChecksum = buf.getWord();
if (Version >= GCOV::V407)
fn->cfgChecksum = buf.getWord();
buf.readString(fn->Name);
StringRef filename;
if (Version < GCOV::V800) {
filename = buf.getString();
fn->startLine = buf.getWord();
} else {
fn->artificial = buf.getWord();
filename = buf.getString();
fn->startLine = buf.getWord();
fn->startColumn = buf.getWord();
fn->endLine = buf.getWord();
if (Version >= GCOV::V900)
fn->endColumn = buf.getWord();
}
auto r = filenameToIdx.try_emplace(filename, filenameToIdx.size());
if (r.second)
filenames.emplace_back(filename);
fn->srcIdx = r.first->second;
IdentToFunction[fn->ident] = fn;
} else if (tag == GCOV_TAG_BLOCKS && fn) {
if (Version < GCOV::V800) {
for (uint32_t i = 0; i != length; ++i) {
buf.getWord(); // Ignored block flags
fn->blocks.push_back(std::make_unique<GCOVBlock>(i));
}
} else {
uint32_t num = buf.getWord();
for (uint32_t i = 0; i != num; ++i)
fn->blocks.push_back(std::make_unique<GCOVBlock>(i));
}
} else if (tag == GCOV_TAG_ARCS && fn) {
uint32_t srcNo = buf.getWord();
if (srcNo >= fn->blocks.size()) {
errs() << "unexpected block number: " << srcNo << " (in "
<< fn->blocks.size() << ")\n";
return false;
}
GCOVBlock *src = fn->blocks[srcNo].get();
for (uint32_t i = 0, e = (length - 1) / 2; i != e; ++i) {
uint32_t dstNo = buf.getWord(), flags = buf.getWord();
GCOVBlock *dst = fn->blocks[dstNo].get();
auto arc = std::make_unique<GCOVArc>(*src, *dst, flags);
src->addDstEdge(arc.get());
dst->addSrcEdge(arc.get());
if (arc->onTree())
fn->treeArcs.push_back(std::move(arc));
else
fn->arcs.push_back(std::move(arc));
}
} else if (tag == GCOV_TAG_LINES && fn) {
uint32_t srcNo = buf.getWord();
if (srcNo >= fn->blocks.size()) {
errs() << "unexpected block number: " << srcNo << " (in "
<< fn->blocks.size() << ")\n";
return false;
}
GCOVBlock &Block = *fn->blocks[srcNo];
for (;;) {
uint32_t line = buf.getWord();
if (line)
Block.addLine(line);
else {
StringRef filename = buf.getString();
if (filename.empty())
break;
// TODO Unhandled
}
}
}
}
GCNOInitialized = true;
return true;
}
/// readGCDA - Read GCDA buffer. It is required that readGCDA() can only be
/// called after readGCNO().
bool GCOVFile::readGCDA(GCOVBuffer &buf) {
assert(GCNOInitialized && "readGCDA() can only be called after readGCNO()");
if (!buf.readGCDAFormat())
return false;
GCOV::GCOVVersion GCDAVersion;
if (!buf.readGCOVVersion(GCDAVersion))
return false;
if (Version != GCDAVersion) {
errs() << "GCOV versions do not match.\n";
return false;
}
uint32_t GCDAChecksum;
if (!buf.readInt(GCDAChecksum))
return false;
if (Checksum != GCDAChecksum) {
errs() << "File checksums do not match: " << Checksum
<< " != " << GCDAChecksum << ".\n";
return false;
}
uint32_t dummy, tag, length;
uint32_t ident;
GCOVFunction *fn = nullptr;
while ((tag = buf.getWord())) {
if (!buf.readInt(length))
return false;
uint32_t pos = buf.cursor.tell();
if (tag == GCOV_TAG_OBJECT_SUMMARY) {
buf.readInt(RunCount);
buf.readInt(dummy);
// clang<11 uses a fake 4.2 format which sets length to 9.
if (length == 9)
buf.readInt(RunCount);
} else if (tag == GCOV_TAG_PROGRAM_SUMMARY) {
// clang<11 uses a fake 4.2 format which sets length to 0.
if (length > 0) {
buf.readInt(dummy);
buf.readInt(dummy);
buf.readInt(RunCount);
}
++ProgramCount;
} else if (tag == GCOV_TAG_FUNCTION) {
if (length == 0) // Placeholder
continue;
// As of GCC 10, GCOV_TAG_FUNCTION_LENGTH has never been larger than 3.
// However, clang<11 uses a fake 4.2 format which may set length larger
// than 3.
if (length < 2 || !buf.readInt(ident))
return false;
auto It = IdentToFunction.find(ident);
uint32_t linenoChecksum, cfgChecksum = 0;
buf.readInt(linenoChecksum);
if (Version >= GCOV::V407)
buf.readInt(cfgChecksum);
if (It != IdentToFunction.end()) {
fn = It->second;
if (linenoChecksum != fn->linenoChecksum ||
cfgChecksum != fn->cfgChecksum) {
errs() << fn->Name
<< format(": checksum mismatch, (%u, %u) != (%u, %u)\n",
linenoChecksum, cfgChecksum, fn->linenoChecksum,
fn->cfgChecksum);
return false;
}
}
} else if (tag == GCOV_TAG_COUNTER_ARCS && fn) {
if (length != 2 * fn->arcs.size()) {
errs() << fn->Name
<< format(
": GCOV_TAG_COUNTER_ARCS mismatch, got %u, expected %u\n",
length, unsigned(2 * fn->arcs.size()));
return false;
}
for (std::unique_ptr<GCOVArc> &arc : fn->arcs) {
if (!buf.readInt64(arc->count))
return false;
arc->src.count += arc->count;
}
if (fn->blocks.size() >= 2) {
GCOVBlock &src = *fn->blocks[0];
GCOVBlock &sink =
Version < GCOV::V408 ? *fn->blocks.back() : *fn->blocks[1];
auto arc = std::make_unique<GCOVArc>(sink, src, GCOV_ARC_ON_TREE);
sink.addDstEdge(arc.get());
src.addSrcEdge(arc.get());
fn->treeArcs.push_back(std::move(arc));
for (GCOVBlock &block : fn->blocksRange())
fn->propagateCounts(block, nullptr);
for (size_t i = fn->treeArcs.size() - 1; i; --i)
fn->treeArcs[i - 1]->src.count += fn->treeArcs[i - 1]->count;
}
}
pos += 4 * length;
if (pos < buf.cursor.tell())
return false;
buf.de.skip(buf.cursor, pos - buf.cursor.tell());
}
return true;
}
void GCOVFile::print(raw_ostream &OS) const {
for (const GCOVFunction &f : *this)
f.print(OS);
}
#if !defined(NDEBUG) || defined(LLVM_ENABLE_DUMP)
/// dump - Dump GCOVFile content to dbgs() for debugging purposes.
LLVM_DUMP_METHOD void GCOVFile::dump() const { print(dbgs()); }
#endif
bool GCOVArc::onTree() const { return flags & GCOV_ARC_ON_TREE; }
//===----------------------------------------------------------------------===//
// GCOVFunction implementation.
StringRef GCOVFunction::getName(bool demangle) const {
if (!demangle)
return Name;
if (demangled.empty()) {
do {
if (Name.startswith("_Z")) {
int status = 0;
// Name is guaranteed to be NUL-terminated.
char *res = itaniumDemangle(Name.data(), nullptr, nullptr, &status);
if (status == 0) {
demangled = res;
free(res);
break;
}
}
demangled = Name;
} while (0);
}
return demangled;
}
StringRef GCOVFunction::getFilename() const { return file.filenames[srcIdx]; }
/// getEntryCount - Get the number of times the function was called by
/// retrieving the entry block's count.
uint64_t GCOVFunction::getEntryCount() const {
return blocks.front()->getCount();
}
GCOVBlock &GCOVFunction::getExitBlock() const {
return file.getVersion() < GCOV::V408 ? *blocks.back() : *blocks[1];
}
// For each basic block, the sum of incoming edge counts equals the sum of
// outgoing edge counts by Kirchoff's circuit law. If the unmeasured arcs form a
// spanning tree, the count for each unmeasured arc (GCOV_ARC_ON_TREE) can be
// uniquely identified.
uint64_t GCOVFunction::propagateCounts(const GCOVBlock &v, GCOVArc *pred) {
// If GCOV_ARC_ON_TREE edges do form a tree, visited is not needed; otherwise
// this prevents infinite recursion.
if (!visited.insert(&v).second)
return 0;
uint64_t excess = 0;
for (GCOVArc *e : v.srcs())
if (e != pred)
excess += e->onTree() ? propagateCounts(e->src, e) : e->count;
for (GCOVArc *e : v.dsts())
if (e != pred)
excess -= e->onTree() ? propagateCounts(e->dst, e) : e->count;
if (int64_t(excess) < 0)
excess = -excess;
if (pred)
pred->count = excess;
return excess;
}
void GCOVFunction::print(raw_ostream &OS) const {
OS << "===== " << Name << " (" << ident << ") @ " << getFilename() << ":"
<< startLine << "\n";
for (const auto &Block : blocks)
Block->print(OS);
}
#if !defined(NDEBUG) || defined(LLVM_ENABLE_DUMP)
/// dump - Dump GCOVFunction content to dbgs() for debugging purposes.
LLVM_DUMP_METHOD void GCOVFunction::dump() const { print(dbgs()); }
#endif
/// collectLineCounts - Collect line counts. This must be used after
/// reading .gcno and .gcda files.
//===----------------------------------------------------------------------===//
// GCOVBlock implementation.
void GCOVBlock::print(raw_ostream &OS) const {
OS << "Block : " << number << " Counter : " << count << "\n";
if (!pred.empty()) {
OS << "\tSource Edges : ";
for (const GCOVArc *Edge : pred)
OS << Edge->src.number << " (" << Edge->count << "), ";
OS << "\n";
}
if (!succ.empty()) {
OS << "\tDestination Edges : ";
for (const GCOVArc *Edge : succ) {
if (Edge->flags & GCOV_ARC_ON_TREE)
OS << '*';
OS << Edge->dst.number << " (" << Edge->count << "), ";
}
OS << "\n";
}
if (!lines.empty()) {
OS << "\tLines : ";
for (uint32_t N : lines)
OS << (N) << ",";
OS << "\n";
}
}
#if !defined(NDEBUG) || defined(LLVM_ENABLE_DUMP)
/// dump - Dump GCOVBlock content to dbgs() for debugging purposes.
LLVM_DUMP_METHOD void GCOVBlock::dump() const { print(dbgs()); }
#endif
uint64_t
GCOVBlock::augmentOneCycle(GCOVBlock *src,
std::vector<std::pair<GCOVBlock *, size_t>> &stack) {
GCOVBlock *u;
size_t i;
stack.clear();
stack.emplace_back(src, 0);
src->incoming = (GCOVArc *)1; // Mark u available for cycle detection
for (;;) {
std::tie(u, i) = stack.back();
if (i == u->succ.size()) {
u->traversable = false;
stack.pop_back();
if (stack.empty())
break;
continue;
}
++stack.back().second;
GCOVArc *succ = u->succ[i];
// Ignore saturated arcs (cycleCount has been reduced to 0) and visited
// blocks. Ignore self arcs to guard against bad input (.gcno has no
// self arcs).
if (succ->cycleCount == 0 || !succ->dst.traversable || &succ->dst == u)
continue;
if (succ->dst.incoming == nullptr) {
succ->dst.incoming = succ;
stack.emplace_back(&succ->dst, 0);
continue;
}
uint64_t minCount = succ->cycleCount;
for (GCOVBlock *v = u;;) {
minCount = std::min(minCount, v->incoming->cycleCount);
v = &v->incoming->src;
if (v == &succ->dst)
break;
}
succ->cycleCount -= minCount;
for (GCOVBlock *v = u;;) {
v->incoming->cycleCount -= minCount;
v = &v->incoming->src;
if (v == &succ->dst)
break;
}
return minCount;
}
return 0;
}
// Get the total execution count of loops among blocks on the same line.
// Assuming a reducible flow graph, the count is the sum of back edge counts.
// Identifying loops is complex, so we simply find cycles and perform cycle
// cancelling iteratively.
uint64_t GCOVBlock::getCyclesCount(const BlockVector &blocks) {
std::vector<std::pair<GCOVBlock *, size_t>> stack;
uint64_t count = 0, d;
for (;;) {
// Make blocks on the line traversable and try finding a cycle.
for (auto b : blocks) {
const_cast<GCOVBlock *>(b)->traversable = true;
const_cast<GCOVBlock *>(b)->incoming = nullptr;
}
d = 0;
for (auto block : blocks) {
auto *b = const_cast<GCOVBlock *>(block);
if (b->traversable && (d = augmentOneCycle(b, stack)) > 0)
break;
}
if (d == 0)
break;
count += d;
}
// If there is no more loop, all traversable bits should have been cleared.
// This property is needed by subsequent calls.
for (auto b : blocks) {
assert(!b->traversable);
(void)b;
}
return count;
}
//===----------------------------------------------------------------------===//
// FileInfo implementation.
// Format dividend/divisor as a percentage. Return 1 if the result is greater
// than 0% and less than 1%.
static uint32_t formatPercentage(uint64_t dividend, uint64_t divisor) {
if (!dividend || !divisor)
return 0;
dividend *= 100;
return dividend < divisor ? 1 : dividend / divisor;
}
// This custom division function mimics gcov's branch ouputs:
// - Round to closest whole number
// - Only output 0% or 100% if it's exactly that value
static uint32_t branchDiv(uint64_t Numerator, uint64_t Divisor) {
if (!Numerator)
return 0;
if (Numerator == Divisor)
return 100;
uint8_t Res = (Numerator * 100 + Divisor / 2) / Divisor;
if (Res == 0)
return 1;
if (Res == 100)
return 99;
return Res;
}
namespace {
struct formatBranchInfo {
formatBranchInfo(const GCOV::Options &Options, uint64_t Count, uint64_t Total)
: Options(Options), Count(Count), Total(Total) {}
void print(raw_ostream &OS) const {
if (!Total)
OS << "never executed";
else if (Options.BranchCount)
OS << "taken " << Count;
else
OS << "taken " << branchDiv(Count, Total) << "%";
}
const GCOV::Options &Options;
uint64_t Count;
uint64_t Total;
};
static raw_ostream &operator<<(raw_ostream &OS, const formatBranchInfo &FBI) {
FBI.print(OS);
return OS;
}
class LineConsumer {
std::unique_ptr<MemoryBuffer> Buffer;
StringRef Remaining;
public:
LineConsumer() = default;
LineConsumer(StringRef Filename) {
// Open source files without requiring a NUL terminator. The concurrent
// modification may nullify the NUL terminator condition.
ErrorOr<std::unique_ptr<MemoryBuffer>> BufferOrErr =
MemoryBuffer::getFileOrSTDIN(Filename, -1,
/*RequiresNullTerminator=*/false);
if (std::error_code EC = BufferOrErr.getError()) {
errs() << Filename << ": " << EC.message() << "\n";
Remaining = "";
} else {
Buffer = std::move(BufferOrErr.get());
Remaining = Buffer->getBuffer();
}
}
bool empty() { return Remaining.empty(); }
void printNext(raw_ostream &OS, uint32_t LineNum) {
StringRef Line;
if (empty())
Line = "/*EOF*/";
else
std::tie(Line, Remaining) = Remaining.split("\n");
OS << format("%5u:", LineNum) << Line << "\n";
}
};
} // end anonymous namespace
/// Convert a path to a gcov filename. If PreservePaths is true, this
/// translates "/" to "#", ".." to "^", and drops ".", to match gcov.
static std::string mangleCoveragePath(StringRef Filename, bool PreservePaths) {
if (!PreservePaths)
return sys::path::filename(Filename).str();
// This behaviour is defined by gcov in terms of text replacements, so it's
// not likely to do anything useful on filesystems with different textual
// conventions.
llvm::SmallString<256> Result("");
StringRef::iterator I, S, E;
for (I = S = Filename.begin(), E = Filename.end(); I != E; ++I) {
if (*I != '/')
continue;
if (I - S == 1 && *S == '.') {
// ".", the current directory, is skipped.
} else if (I - S == 2 && *S == '.' && *(S + 1) == '.') {
// "..", the parent directory, is replaced with "^".
Result.append("^#");
} else {
if (S < I)
// Leave other components intact,
Result.append(S, I);
// And separate with "#".
Result.push_back('#');
}
S = I + 1;
}
if (S < I)
Result.append(S, I);
return std::string(Result.str());
}
std::string Context::getCoveragePath(StringRef filename,
StringRef mainFilename) const {
if (options.NoOutput)
// This is probably a bug in gcov, but when -n is specified, paths aren't
// mangled at all, and the -l and -p options are ignored. Here, we do the
// same.
return std::string(filename);
std::string CoveragePath;
if (options.LongFileNames && !filename.equals(mainFilename))
CoveragePath =
mangleCoveragePath(mainFilename, options.PreservePaths) + "##";
CoveragePath += mangleCoveragePath(filename, options.PreservePaths);
if (options.HashFilenames) {
MD5 Hasher;
MD5::MD5Result Result;
Hasher.update(filename.str());
Hasher.final(Result);
CoveragePath += "##" + std::string(Result.digest());
}
CoveragePath += ".gcov";
return CoveragePath;
}
void Context::collectFunction(GCOVFunction &f, Summary &summary) {
SourceInfo &si = sources[f.srcIdx];
if (f.startLine >= si.startLineToFunctions.size())
si.startLineToFunctions.resize(f.startLine + 1);
si.startLineToFunctions[f.startLine].push_back(&f);
for (const GCOVBlock &b : f.blocksRange()) {
if (b.lines.empty())
continue;
uint32_t maxLineNum = *std::max_element(b.lines.begin(), b.lines.end());
if (maxLineNum >= si.lines.size())
si.lines.resize(maxLineNum + 1);
for (uint32_t lineNum : b.lines) {
LineInfo &line = si.lines[lineNum];
if (!line.exists)
++summary.lines;
if (line.count == 0 && b.count)
++summary.linesExec;
line.exists = true;
line.count += b.count;
line.blocks.push_back(&b);
}
}
}
void Context::collectSourceLine(SourceInfo &si, Summary *summary,
LineInfo &line, size_t lineNum) const {
uint64_t count = 0;
for (const GCOVBlock *b : line.blocks) {
if (b->number == 0) {
// For nonstandard control flows, arcs into the exit block may be
// duplicately counted (fork) or not be counted (abnormal exit), and thus
// the (exit,entry) counter may be inaccurate. Count the entry block with
// the outgoing arcs.
for (const GCOVArc *arc : b->succ)
count += arc->count;
} else {
// Add counts from predecessors that are not on the same line.
for (const GCOVArc *arc : b->pred)
if (!llvm::is_contained(line.blocks, &arc->src))
count += arc->count;
}
for (GCOVArc *arc : b->succ)
arc->cycleCount = arc->count;
}
count += GCOVBlock::getCyclesCount(line.blocks);
line.count = count;
if (line.exists) {
++summary->lines;
if (line.count != 0)
++summary->linesExec;
}
if (options.BranchInfo)
for (const GCOVBlock *b : line.blocks) {
if (b->getLastLine() != lineNum)
continue;
int branches = 0, execBranches = 0, takenBranches = 0;
for (const GCOVArc *arc : b->succ) {
++branches;
if (count != 0)
++execBranches;
if (arc->count != 0)
++takenBranches;
}
if (branches > 1) {
summary->branches += branches;
summary->branchesExec += execBranches;
summary->branchesTaken += takenBranches;
}
}
}
void Context::collectSource(SourceInfo &si, Summary &summary) const {
size_t lineNum = 0;
for (LineInfo &line : si.lines) {
collectSourceLine(si, &summary, line, lineNum);
++lineNum;
}
}
void Context::annotateSource(SourceInfo &si, const GCOVFile &file,
StringRef gcno, StringRef gcda,
raw_ostream &os) const {
auto source =
options.Intermediate ? LineConsumer() : LineConsumer(si.filename);
os << " -: 0:Source:" << si.displayName << '\n';
os << " -: 0:Graph:" << gcno << '\n';
os << " -: 0:Data:" << gcda << '\n';
os << " -: 0:Runs:" << file.RunCount << '\n';
if (file.Version < GCOV::V900)
os << " -: 0:Programs:" << file.ProgramCount << '\n';
for (size_t lineNum = 1; !source.empty(); ++lineNum) {
if (lineNum >= si.lines.size()) {
os << " -:";
source.printNext(os, lineNum);
continue;
}
const LineInfo &line = si.lines[lineNum];
if (options.BranchInfo && lineNum < si.startLineToFunctions.size())
for (const auto *f : si.startLineToFunctions[lineNum])
printFunctionDetails(*f, os);
if (!line.exists)
os << " -:";
else if (line.count == 0)
os << " #####:";
else
os << format("%9" PRIu64 ":", line.count);
source.printNext(os, lineNum);
uint32_t blockIdx = 0, edgeIdx = 0;
for (const GCOVBlock *b : line.blocks) {
if (b->getLastLine() != lineNum)
continue;
if (options.AllBlocks) {
if (b->getCount() == 0)
os << " $$$$$:";
else
os << format("%9" PRIu64 ":", b->count);
os << format("%5u-block %2u\n", lineNum, blockIdx++);
}
if (options.BranchInfo) {
size_t NumEdges = b->succ.size();
if (NumEdges > 1)
printBranchInfo(*b, edgeIdx, os);
else if (options.UncondBranch && NumEdges == 1) {
uint64_t count = b->succ[0]->count;
os << format("unconditional %2u ", edgeIdx++)
<< formatBranchInfo(options, count, count) << '\n';
}
}
}
}
}
void Context::printSourceToIntermediate(const SourceInfo &si,
raw_ostream &os) const {
os << "file:" << si.filename << '\n';
for (const auto &fs : si.startLineToFunctions)
for (const GCOVFunction *f : fs)
os << "function:" << f->startLine << ',' << f->getEntryCount() << ','
<< f->getName(options.Demangle) << '\n';
for (size_t lineNum = 1, size = si.lines.size(); lineNum < size; ++lineNum) {
const LineInfo &line = si.lines[lineNum];
if (line.blocks.empty())
continue;
// GCC 8 (r254259) added third third field for Ada:
// lcount:<line>,<count>,<has_unexecuted_blocks>
// We don't need the third field.
os << "lcount:" << lineNum << ',' << line.count << '\n';
if (!options.BranchInfo)
continue;
for (const GCOVBlock *b : line.blocks) {
if (b->succ.size() < 2 || b->getLastLine() != lineNum)
continue;
for (const GCOVArc *arc : b->succ) {
const char *type =
b->getCount() ? arc->count ? "taken" : "nottaken" : "notexec";
os << "branch:" << lineNum << ',' << type << '\n';
}
}
}
}
void Context::print(StringRef filename, StringRef gcno, StringRef gcda,
GCOVFile &file) {
for (StringRef filename : file.filenames) {
sources.emplace_back(filename);
SourceInfo &si = sources.back();
si.displayName = si.filename;
if (!options.SourcePrefix.empty() &&
sys::path::replace_path_prefix(si.displayName, options.SourcePrefix,
"") &&
!si.displayName.empty()) {
// TODO replace_path_prefix may strip the prefix even if the remaining
// part does not start with a separator.
if (sys::path::is_separator(si.displayName[0]))
si.displayName.erase(si.displayName.begin());
else
si.displayName = si.filename;
}
if (options.RelativeOnly && sys::path::is_absolute(si.displayName))
si.ignored = true;
}
raw_ostream &os = llvm::outs();
for (GCOVFunction &f : make_pointee_range(file.functions)) {
Summary summary(f.getName(options.Demangle));
collectFunction(f, summary);
if (options.FuncCoverage && !options.UseStdout) {
os << "Function '" << summary.Name << "'\n";
printSummary(summary, os);
os << '\n';
}
}
for (SourceInfo &si : sources) {
if (si.ignored)
continue;
Summary summary(si.displayName);
collectSource(si, summary);
// Print file summary unless -t is specified.
std::string gcovName = getCoveragePath(si.filename, filename);
if (!options.UseStdout) {
os << "File '" << summary.Name << "'\n";
printSummary(summary, os);
if (!options.NoOutput && !options.Intermediate)
os << "Creating '" << gcovName << "'\n";
os << '\n';
}
if (options.NoOutput || options.Intermediate)
continue;
Optional<raw_fd_ostream> os;
if (!options.UseStdout) {
std::error_code ec;
os.emplace(gcovName, ec, sys::fs::OF_Text);
if (ec) {
errs() << ec.message() << '\n';
continue;
}
}
annotateSource(si, file, gcno, gcda,
options.UseStdout ? llvm::outs() : *os);
}
if (options.Intermediate && !options.NoOutput) {
// gcov 7.* unexpectedly create multiple .gcov files, which was fixed in 8.0
// (PR GCC/82702). We create just one file.
std::string outputPath(sys::path::filename(filename));
std::error_code ec;
raw_fd_ostream os(outputPath + ".gcov", ec, sys::fs::OF_Text);
if (ec) {
errs() << ec.message() << '\n';
return;
}
for (const SourceInfo &si : sources)
printSourceToIntermediate(si, os);
}
}
void Context::printFunctionDetails(const GCOVFunction &f,
raw_ostream &os) const {
const uint64_t entryCount = f.getEntryCount();
uint32_t blocksExec = 0;
const GCOVBlock &exitBlock = f.getExitBlock();
uint64_t exitCount = 0;
for (const GCOVArc *arc : exitBlock.pred)
exitCount += arc->count;
for (const GCOVBlock &b : f.blocksRange())
if (b.number != 0 && &b != &exitBlock && b.getCount())
++blocksExec;
os << "function " << f.getName(options.Demangle) << " called " << entryCount
<< " returned " << formatPercentage(exitCount, entryCount)
<< "% blocks executed "
<< formatPercentage(blocksExec, f.blocks.size() - 2) << "%\n";
}
/// printBranchInfo - Print conditional branch probabilities.
void Context::printBranchInfo(const GCOVBlock &Block, uint32_t &edgeIdx,
raw_ostream &os) const {
uint64_t total = 0;
for (const GCOVArc *arc : Block.dsts())
total += arc->count;
for (const GCOVArc *arc : Block.dsts())
os << format("branch %2u ", edgeIdx++)
<< formatBranchInfo(options, arc->count, total) << '\n';
}
void Context::printSummary(const Summary &summary, raw_ostream &os) const {
os << format("Lines executed:%.2f%% of %" PRIu64 "\n",
double(summary.linesExec) * 100 / summary.lines, summary.lines);
if (options.BranchInfo) {
if (summary.branches == 0) {
os << "No branches\n";
} else {
os << format("Branches executed:%.2f%% of %" PRIu64 "\n",
double(summary.branchesExec) * 100 / summary.branches,
summary.branches);
os << format("Taken at least once:%.2f%% of %" PRIu64 "\n",
double(summary.branchesTaken) * 100 / summary.branches,
summary.branches);
}
os << "No calls\n";
}
}
void llvm::gcovOneInput(const GCOV::Options &options, StringRef filename,
StringRef gcno, StringRef gcda, GCOVFile &file) {
Context fi(options);
fi.print(filename, gcno, gcda, file);
}
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