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-rw-r--r--lib/IR/GCOV.cpp157
1 files changed, 135 insertions, 22 deletions
diff --git a/lib/IR/GCOV.cpp b/lib/IR/GCOV.cpp
index 5587cbfa08..73642c98f4 100644
--- a/lib/IR/GCOV.cpp
+++ b/lib/IR/GCOV.cpp
@@ -19,6 +19,7 @@
#include "llvm/Support/Format.h"
#include "llvm/Support/MemoryObject.h"
#include "llvm/Support/system_error.h"
+#include <algorithm>
using namespace llvm;
//===----------------------------------------------------------------------===//
@@ -278,10 +279,23 @@ bool GCOVFunction::readGCDA(GCOVBuffer &Buff, GCOV::GCOVVersion Version) {
Block.addCount(EdgeNo, ArcCount);
--Count;
}
+ Block.sortDstEdges();
}
return true;
}
+/// 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();
+}
+
+/// getExitCount - Get the number of times the function returned by retrieving
+/// the exit block's count.
+uint64_t GCOVFunction::getExitCount() const {
+ return Blocks.back()->getCount();
+}
+
/// dump - Dump GCOVFunction content to dbgs() for debugging purposes.
void GCOVFunction::dump() const {
dbgs() << "===== " << Name << " @ " << Filename << ":" << LineNumber << "\n";
@@ -296,6 +310,7 @@ void GCOVFunction::collectLineCounts(FileInfo &FI) {
for (SmallVectorImpl<GCOVBlock *>::iterator I = Blocks.begin(),
E = Blocks.end(); I != E; ++I)
(*I)->collectLineCounts(FI);
+ FI.addFunctionLine(Filename, LineNumber, this);
}
//===----------------------------------------------------------------------===//
@@ -318,6 +333,15 @@ void GCOVBlock::addCount(size_t DstEdgeNo, uint64_t N) {
DstEdges[DstEdgeNo]->Dst->Counter += N;
}
+/// sortDstEdges - Sort destination edges by block number, nop if already
+/// sorted. This is required for printing branch info in the correct order.
+void GCOVBlock::sortDstEdges() {
+ if (!DstEdgesAreSorted) {
+ SortDstEdgesFunctor SortEdges;
+ std::stable_sort(DstEdges.begin(), DstEdges.end(), SortEdges);
+ }
+}
+
/// collectLineCounts - Collect line counts. This must be used after
/// reading .gcno and .gcda files.
void GCOVBlock::collectLineCounts(FileInfo &FI) {
@@ -357,9 +381,32 @@ void GCOVBlock::dump() const {
//===----------------------------------------------------------------------===//
// FileInfo implementation.
+// Safe integer division, returns 0 if numerator is 0.
+static uint32_t safeDiv(uint64_t Numerator, uint64_t Divisor) {
+ if (!Numerator)
+ return 0;
+ return Numerator/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;
+}
+
/// print - Print source files with collected line count information.
-void FileInfo::print(StringRef GCNOFile, StringRef GCDAFile,
- const GCOVOptions &Options) const {
+void FileInfo::print(StringRef GCNOFile, StringRef GCDAFile) const {
for (StringMap<LineData>::const_iterator I = LineInfo.begin(),
E = LineInfo.end(); I != E; ++I) {
StringRef Filename = I->first();
@@ -383,12 +430,24 @@ void FileInfo::print(StringRef GCNOFile, StringRef GCDAFile,
OS << " -: 0:Programs:" << ProgramCount << "\n";
const LineData &Line = I->second;
- for (uint32_t i = 0; !AllLines.empty(); ++i) {
- LineData::const_iterator BlocksIt = Line.find(i);
+ for (uint32_t LineIndex = 0; !AllLines.empty(); ++LineIndex) {
+ if (Options.BranchProb) {
+ FunctionLines::const_iterator FuncsIt = Line.Functions.find(LineIndex);
+ if (FuncsIt != Line.Functions.end())
+ printFunctionSummary(OS, FuncsIt->second);
+ }
- if (BlocksIt != Line.end()) {
- // Add up the block counts to form line counts.
+ BlockLines::const_iterator BlocksIt = Line.Blocks.find(LineIndex);
+ if (BlocksIt == Line.Blocks.end()) {
+ // No basic blocks are on this line. Not an executable line of code.
+ OS << " -:";
+ std::pair<StringRef, StringRef> P = AllLines.split('\n');
+ OS << format("%5u:", LineIndex+1) << P.first << "\n";
+ AllLines = P.second;
+ } else {
const BlockVector &Blocks = BlocksIt->second;
+
+ // Add up the block counts to form line counts.
uint64_t LineCount = 0;
for (BlockVector::const_iterator I = Blocks.begin(), E = Blocks.end();
I != E; ++I) {
@@ -406,30 +465,84 @@ void FileInfo::print(StringRef GCNOFile, StringRef GCDAFile,
OS << " #####:";
else
OS << format("%9" PRIu64 ":", LineCount);
- } else {
- OS << " -:";
- }
- std::pair<StringRef, StringRef> P = AllLines.split('\n');
- OS << format("%5u:", i+1) << P.first << "\n";
- AllLines = P.second;
- if (Options.AllBlocks && BlocksIt != Line.end()) {
- // Output the counts for each block at the last line of the block.
+ std::pair<StringRef, StringRef> P = AllLines.split('\n');
+ OS << format("%5u:", LineIndex+1) << P.first << "\n";
+ AllLines = P.second;
+
uint32_t BlockNo = 0;
- const BlockVector &Blocks = BlocksIt->second;
+ uint32_t EdgeNo = 0;
for (BlockVector::const_iterator I = Blocks.begin(), E = Blocks.end();
I != E; ++I) {
const GCOVBlock *Block = *I;
- if (Block->getLastLine() != i+1)
- continue;
- if (Block->getCount() == 0)
- OS << " $$$$$:";
- else
- OS << format("%9" PRIu64 ":", (uint64_t)Block->getCount());
- OS << format("%5u-block %u\n", i+1, BlockNo++);
+ // Only print block and branch information at the end of the block.
+ if (Block->getLastLine() != LineIndex+1)
+ continue;
+ if (Options.AllBlocks)
+ printBlockInfo(OS, *Block, LineIndex, BlockNo);
+ if (Options.BranchProb)
+ printBranchInfo(OS, *Block, LineIndex, EdgeNo);
}
}
}
}
}
+
+/// printFunctionSummary - Print function and block summary.
+void FileInfo::printFunctionSummary(raw_fd_ostream &OS,
+ const FunctionVector &Funcs) const {
+ for (FunctionVector::const_iterator I = Funcs.begin(), E = Funcs.end();
+ I != E; ++I) {
+ const GCOVFunction *Func = *I;
+ uint64_t EntryCount = Func->getEntryCount();
+ uint32_t BlocksExecuted = 0;
+ for (GCOVFunction::BlockIterator I = Func->block_begin(),
+ E = Func->block_end(); I != E; ++I) {
+ const GCOVBlock *Block = *I;
+ if (Block->getNumDstEdges() && Block->getCount())
+ ++BlocksExecuted;
+ }
+
+ OS << "function " << Func->getName() << " called " << EntryCount
+ << " returned " << safeDiv(Func->getExitCount()*100, EntryCount)
+ << "% blocks executed "
+ << safeDiv(BlocksExecuted*100, Func->getNumBlocks()-1) << "%\n";
+ }
+}
+
+/// printBlockInfo - Output counts for each block.
+void FileInfo::printBlockInfo(raw_fd_ostream &OS, const GCOVBlock &Block,
+ uint32_t LineIndex, uint32_t &BlockNo) const {
+ if (Block.getCount() == 0)
+ OS << " $$$$$:";
+ else
+ OS << format("%9" PRIu64 ":", Block.getCount());
+ OS << format("%5u-block %2u\n", LineIndex+1, BlockNo++);
+}
+
+/// printBranchInfo - Print branch probabilities for blocks that have
+/// conditional branches.
+void FileInfo::printBranchInfo(raw_fd_ostream &OS, const GCOVBlock &Block,
+ uint32_t LineIndex, uint32_t &EdgeNo) const {
+ if (Block.getNumDstEdges() < 2)
+ return;
+
+ SmallVector<uint64_t, 16> BranchCounts;
+ uint64_t TotalCounts = 0;
+ for (GCOVBlock::EdgeIterator I = Block.dst_begin(), E = Block.dst_end();
+ I != E; ++I) {
+ const GCOVEdge *Edge = *I;
+ BranchCounts.push_back(Edge->Count);
+ TotalCounts += Edge->Count;
+ }
+
+ for (SmallVectorImpl<uint64_t>::const_iterator I = BranchCounts.begin(),
+ E = BranchCounts.end(); I != E; ++I) {
+ if (TotalCounts)
+ OS << format("branch %2u taken %u%%\n", EdgeNo++,
+ branchDiv(*I, TotalCounts));
+ else
+ OS << format("branch %2u never executed\n", EdgeNo++);
+ }
+}
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