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//===-- DiffConsumer.cpp - Difference Consumer ------------------*- C++ -*-===//
//
// 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
//
//===----------------------------------------------------------------------===//
//
// This files implements the LLVM difference Consumer
//
//===----------------------------------------------------------------------===//
#include "DiffConsumer.h"
#include "llvm/IR/Instructions.h"
#include "llvm/Support/Debug.h"
#include "llvm/Support/ErrorHandling.h"
using namespace llvm;
static void ComputeNumbering(const Function *F,
DenseMap<const Value *, unsigned> &Numbering) {
unsigned IN = 0;
// Arguments get the first numbers.
for (const auto &Arg : F->args())
if (!Arg.hasName())
Numbering[&Arg] = IN++;
// Walk the basic blocks in order.
for (const auto &Func : *F) {
if (!Func.hasName())
Numbering[&Func] = IN++;
// Walk the instructions in order.
for (const auto &BB : Func)
// void instructions don't get numbers.
if (!BB.hasName() && !BB.getType()->isVoidTy())
Numbering[&BB] = IN++;
}
assert(!Numbering.empty() && "asked for numbering but numbering was no-op");
}
void Consumer::anchor() { }
void DiffConsumer::printValue(const Value *V, bool isL) {
if (V->hasName()) {
out << (isa<GlobalValue>(V) ? '@' : '%') << V->getName();
return;
}
if (V->getType()->isVoidTy()) {
if (auto *SI = dyn_cast<StoreInst>(V)) {
out << "store to ";
printValue(SI->getPointerOperand(), isL);
} else if (auto *CI = dyn_cast<CallInst>(V)) {
out << "call to ";
printValue(CI->getCalledOperand(), isL);
} else if (auto *II = dyn_cast<InvokeInst>(V)) {
out << "invoke to ";
printValue(II->getCalledOperand(), isL);
} else {
out << *V;
}
return;
}
if (isa<Constant>(V)) {
out << *V;
return;
}
unsigned N = contexts.size();
while (N > 0) {
--N;
DiffContext &ctxt = contexts[N];
if (!ctxt.IsFunction) continue;
if (isL) {
if (ctxt.LNumbering.empty())
ComputeNumbering(cast<Function>(ctxt.L), ctxt.LNumbering);
out << '%' << ctxt.LNumbering[V];
return;
} else {
if (ctxt.RNumbering.empty())
ComputeNumbering(cast<Function>(ctxt.R), ctxt.RNumbering);
out << '%' << ctxt.RNumbering[V];
return;
}
}
out << "<anonymous>";
}
void DiffConsumer::header() {
if (contexts.empty()) return;
for (SmallVectorImpl<DiffContext>::iterator
I = contexts.begin(), E = contexts.end(); I != E; ++I) {
if (I->Differences) continue;
if (isa<Function>(I->L)) {
// Extra newline between functions.
if (Differences) out << "\n";
const Function *L = cast<Function>(I->L);
const Function *R = cast<Function>(I->R);
if (L->getName() != R->getName())
out << "in function " << L->getName()
<< " / " << R->getName() << ":\n";
else
out << "in function " << L->getName() << ":\n";
} else if (isa<BasicBlock>(I->L)) {
const BasicBlock *L = cast<BasicBlock>(I->L);
const BasicBlock *R = cast<BasicBlock>(I->R);
if (L->hasName() && R->hasName() && L->getName() == R->getName())
out << " in block %" << L->getName() << ":\n";
else {
out << " in block ";
printValue(L, true);
out << " / ";
printValue(R, false);
out << ":\n";
}
} else if (isa<Instruction>(I->L)) {
out << " in instruction ";
printValue(I->L, true);
out << " / ";
printValue(I->R, false);
out << ":\n";
}
I->Differences = true;
}
}
void DiffConsumer::indent() {
unsigned N = Indent;
while (N--) out << ' ';
}
void DiffConsumer::reset() {
contexts.clear();
Differences = false;
Indent = 0;
}
bool DiffConsumer::hadDifferences() const {
return Differences;
}
void DiffConsumer::enterContext(const Value *L, const Value *R) {
contexts.push_back(DiffContext(L, R));
Indent += 2;
}
void DiffConsumer::exitContext() {
Differences |= contexts.back().Differences;
contexts.pop_back();
Indent -= 2;
}
void DiffConsumer::log(StringRef text) {
header();
indent();
out << text << '\n';
}
void DiffConsumer::logf(const LogBuilder &Log) {
header();
indent();
unsigned arg = 0;
StringRef format = Log.getFormat();
while (true) {
size_t percent = format.find('%');
if (percent == StringRef::npos) {
out << format;
break;
}
assert(format[percent] == '%');
if (percent > 0) out << format.substr(0, percent);
switch (format[percent+1]) {
case '%': out << '%'; break;
case 'l': printValue(Log.getArgument(arg++), true); break;
case 'r': printValue(Log.getArgument(arg++), false); break;
default: llvm_unreachable("unknown format character");
}
format = format.substr(percent+2);
}
out << '\n';
}
void DiffConsumer::logd(const DiffLogBuilder &Log) {
header();
for (unsigned I = 0, E = Log.getNumLines(); I != E; ++I) {
indent();
switch (Log.getLineKind(I)) {
case DC_match:
out << " ";
Log.getLeft(I)->print(dbgs()); dbgs() << '\n';
//printValue(Log.getLeft(I), true);
break;
case DC_left:
out << "< ";
Log.getLeft(I)->print(dbgs()); dbgs() << '\n';
//printValue(Log.getLeft(I), true);
break;
case DC_right:
out << "> ";
Log.getRight(I)->print(dbgs()); dbgs() << '\n';
//printValue(Log.getRight(I), false);
break;
}
//out << "\n";
}
}
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