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//===-- gen/coverage.h - Code Coverage Analysis -----------------*- C++ -*-===//
//
// LDC – the LLVM D compiler
//
// This file is distributed under the BSD-style LDC license. See the LICENSE
// file for details.
//
//===----------------------------------------------------------------------===//
#include "gen/coverage.h"
#include "dmd/module.h"
#include "driver/cl_options.h"
#include "gen/irstate.h"
#include "gen/logger.h"
void emitCoverageLinecountInc(const Loc &loc) {
Module *m = gIR->dmodule;
// Only emit coverage increment for locations in the source of the current
// module
// (for example, 'inlined' methods from other source files should be skipped).
if (!global.params.cov || !loc.linnum || !loc.filename || !m->d_cover_data ||
strcmp(m->srcfile.toChars(), loc.filename) != 0) {
return;
}
const unsigned line = loc.linnum - 1; // convert to 0-based line# index
assert(line < m->numlines);
IF_LOG Logger::println("Coverage: increment _d_cover_data[%d]", line);
LOG_SCOPE;
// Increment the line counter:
// Get GEP into _d_cover_data array...
LLType *i32Type = LLType::getInt32Ty(gIR->context());
LLConstant *idxs[] = {DtoConstUint(0), DtoConstUint(line)};
LLValue *ptr = llvm::ConstantExpr::getGetElementPtr(
LLArrayType::get(i32Type, m->numlines), m->d_cover_data, idxs, true);
// ...and generate the "increment" instruction(s)
switch (opts::coverageIncrement) {
case opts::CoverageIncrement::_default: // fallthrough
case opts::CoverageIncrement::atomic:
// Do an atomic increment, so this works when multiple threads are executed.
gIR->ir->CreateAtomicRMW(llvm::AtomicRMWInst::Add, ptr, DtoConstUint(1),
#if LDC_LLVM_VER >= 1300
LLAlign(4),
#endif
llvm::AtomicOrdering::Monotonic);
break;
case opts::CoverageIncrement::nonatomic: {
// Do a non-atomic increment, user is responsible for correct results with
// multithreaded execution
llvm::LoadInst *load = gIR->ir->CreateAlignedLoad(i32Type, ptr, LLAlign(4));
llvm::StoreInst *store = gIR->ir->CreateAlignedStore(
gIR->ir->CreateAdd(load, DtoConstUint(1)), ptr, LLAlign(4));
// add !nontemporal attribute, to inform the optimizer that caching is not
// needed
llvm::MDNode *node = llvm::MDNode::get(
gIR->context(), llvm::ConstantAsMetadata::get(DtoConstInt(1)));
load->setMetadata("nontemporal", node);
store->setMetadata("nontemporal", node);
break;
}
case opts::CoverageIncrement::boolean: {
// Do a boolean set, avoiding a memory read (blocking) and threading issues
// at the cost of not "counting"
llvm::StoreInst *store =
gIR->ir->CreateAlignedStore(DtoConstUint(1), ptr, LLAlign(4));
// add !nontemporal attribute, to inform the optimizer that caching is not
// needed
llvm::MDNode *node = llvm::MDNode::get(
gIR->context(), llvm::ConstantAsMetadata::get(DtoConstInt(1)));
store->setMetadata("nontemporal", node);
break;
}
}
// Set the 'counter valid' bit to 1 for this line of code
unsigned num_sizet_bits = gDataLayout->getTypeSizeInBits(DtoSize_t());
unsigned idx = line / num_sizet_bits;
unsigned bitidx = line % num_sizet_bits;
IF_LOG Logger::println("_d_cover_valid[%d] |= (1 << %d)", idx, bitidx);
m->d_cover_valid_init[idx] |= (size_t(1) << bitidx);
}
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