lib/IR/DiagnosticInfo.cpp

//===- llvm/Support/DiagnosticInfo.cpp - Diagnostic Definitions -*- C++ -*-===//
//
//                     The LLVM Compiler Infrastructure
//
// This file is distributed under the University of Illinois Open Source
// License. See LICENSE.TXT for details.
//
//===----------------------------------------------------------------------===//
//
// This file defines the different classes involved in low level diagnostics.
//
// Diagnostics reporting is still done as part of the LLVMContext.
//===----------------------------------------------------------------------===//

#include "llvm/IR/DiagnosticInfo.h"
#include "llvm/ADT/StringExtras.h"
#include "llvm/ADT/Twine.h"
#include "llvm/ADT/iterator_range.h"
#include "llvm/IR/BasicBlock.h"
#include "llvm/IR/Constants.h"
#include "llvm/IR/DebugInfoMetadata.h"
#include "llvm/IR/DerivedTypes.h"
#include "llvm/IR/DiagnosticPrinter.h"
#include "llvm/IR/Function.h"
#include "llvm/IR/GlobalValue.h"
#include "llvm/IR/Instruction.h"
#include "llvm/IR/LLVMContext.h"
#include "llvm/IR/Metadata.h"
#include "llvm/IR/Module.h"
#include "llvm/IR/Type.h"
#include "llvm/IR/Value.h"
#include "llvm/Support/Casting.h"
#include "llvm/Support/CommandLine.h"
#include "llvm/Support/ErrorHandling.h"
#include "llvm/Support/Regex.h"
#include "llvm/Support/raw_ostream.h"
#include <atomic>
#include <cassert>
#include <memory>
#include <string>

using namespace llvm;

namespace {

/// \brief Regular expression corresponding to the value given in one of the
/// -pass-remarks* command line flags. Passes whose name matches this regexp
/// will emit a diagnostic when calling the associated diagnostic function
/// (emitOptimizationRemark, emitOptimizationRemarkMissed or
/// emitOptimizationRemarkAnalysis).
struct PassRemarksOpt {
  std::shared_ptr<Regex> Pattern;

  void operator=(const std::string &Val) {
    // Create a regexp object to match pass names for emitOptimizationRemark.
    if (!Val.empty()) {
      Pattern = std::make_shared<Regex>(Val);
      std::string RegexError;
      if (!Pattern->isValid(RegexError))
        report_fatal_error("Invalid regular expression '" + Val +
                               "' in -pass-remarks: " + RegexError,
                           false);
    }
  }
};

} // end anonymous namespace

static PassRemarksOpt PassRemarksOptLoc;
static PassRemarksOpt PassRemarksMissedOptLoc;
static PassRemarksOpt PassRemarksAnalysisOptLoc;

// -pass-remarks
//    Command line flag to enable emitOptimizationRemark()
static cl::opt<PassRemarksOpt, true, cl::parser<std::string>>
PassRemarks("pass-remarks", cl::value_desc("pattern"),
            cl::desc("Enable optimization remarks from passes whose name match "
                     "the given regular expression"),
            cl::Hidden, cl::location(PassRemarksOptLoc), cl::ValueRequired,
            cl::ZeroOrMore);

// -pass-remarks-missed
//    Command line flag to enable emitOptimizationRemarkMissed()
static cl::opt<PassRemarksOpt, true, cl::parser<std::string>> PassRemarksMissed(
    "pass-remarks-missed", cl::value_desc("pattern"),
    cl::desc("Enable missed optimization remarks from passes whose name match "
             "the given regular expression"),
    cl::Hidden, cl::location(PassRemarksMissedOptLoc), cl::ValueRequired,
    cl::ZeroOrMore);

// -pass-remarks-analysis
//    Command line flag to enable emitOptimizationRemarkAnalysis()
static cl::opt<PassRemarksOpt, true, cl::parser<std::string>>
PassRemarksAnalysis(
    "pass-remarks-analysis", cl::value_desc("pattern"),
    cl::desc(
        "Enable optimization analysis remarks from passes whose name match "
        "the given regular expression"),
    cl::Hidden, cl::location(PassRemarksAnalysisOptLoc), cl::ValueRequired,
    cl::ZeroOrMore);

int llvm::getNextAvailablePluginDiagnosticKind() {
  static std::atomic<int> PluginKindID(DK_FirstPluginKind);
  return ++PluginKindID;
}

const char *OptimizationRemarkAnalysis::AlwaysPrint = "";

DiagnosticInfoInlineAsm::DiagnosticInfoInlineAsm(const Instruction &I,
                                                 const Twine &MsgStr,
                                                 DiagnosticSeverity Severity)
    : DiagnosticInfo(DK_InlineAsm, Severity), MsgStr(MsgStr), Instr(&I) {
  if (const MDNode *SrcLoc = I.getMetadata("srcloc")) {
    if (SrcLoc->getNumOperands() != 0)
      if (const auto *CI =
              mdconst::dyn_extract<ConstantInt>(SrcLoc->getOperand(0)))
        LocCookie = CI->getZExtValue();
  }
}

void DiagnosticInfoInlineAsm::print(DiagnosticPrinter &DP) const {
  DP << getMsgStr();
  if (getLocCookie())
    DP << " at line " << getLocCookie();
}

void DiagnosticInfoResourceLimit::print(DiagnosticPrinter &DP) const {
  DP << getResourceName() << " limit";

  if (getResourceLimit() != 0)
    DP << " of " << getResourceLimit();

  DP << " exceeded (" <<  getResourceSize() << ") in " << getFunction();
}

void DiagnosticInfoDebugMetadataVersion::print(DiagnosticPrinter &DP) const {
  DP << "ignoring debug info with an invalid version (" << getMetadataVersion()
     << ") in " << getModule();
}

void DiagnosticInfoIgnoringInvalidDebugMetadata::print(
    DiagnosticPrinter &DP) const {
  DP << "ignoring invalid debug info in " << getModule().getModuleIdentifier();
}

void DiagnosticInfoSampleProfile::print(DiagnosticPrinter &DP) const {
  if (!FileName.empty()) {
    DP << getFileName();
    if (LineNum > 0)
      DP << ":" << getLineNum();
    DP << ": ";
  }
  DP << getMsg();
}

void DiagnosticInfoPGOProfile::print(DiagnosticPrinter &DP) const {
  if (getFileName())
    DP << getFileName() << ": ";
  DP << getMsg();
}

DiagnosticLocation::DiagnosticLocation(const DebugLoc &DL) {
  if (!DL)
    return;
  Filename = DL->getFilename();
  Line = DL->getLine();
  Column = DL->getColumn();
}

DiagnosticLocation::DiagnosticLocation(const DISubprogram *SP) {
  if (!SP)
    return;
  Filename = SP->getFilename();
  Line = SP->getScopeLine();
  Column = 0;
}

void DiagnosticInfoWithLocationBase::getLocation(StringRef *Filename,
                                                 unsigned *Line,
                                                 unsigned *Column) const {
  *Filename = Loc.getFilename();
  *Line = Loc.getLine();
  *Column = Loc.getColumn();
}

const std::string DiagnosticInfoWithLocationBase::getLocationStr() const {
  StringRef Filename("<unknown>");
  unsigned Line = 0;
  unsigned Column = 0;
  if (isLocationAvailable())
    getLocation(&Filename, &Line, &Column);
  return (Filename + ":" + Twine(Line) + ":" + Twine(Column)).str();
}

DiagnosticInfoOptimizationBase::Argument::Argument(StringRef Key, const Value *V)
    : Key(Key) {
  if (auto *F = dyn_cast<Function>(V)) {
    if (DISubprogram *SP = F->getSubprogram())
      Loc = SP;
  }
  else if (auto *I = dyn_cast<Instruction>(V))
    Loc = I->getDebugLoc();

  // Only include names that correspond to user variables.  FIXME: we should use
  // debug info if available to get the name of the user variable.
  if (isa<llvm::Argument>(V) || isa<GlobalValue>(V))
    Val = GlobalValue::dropLLVMManglingEscape(V->getName());
  else if (isa<Constant>(V)) {
    raw_string_ostream OS(Val);
    V->printAsOperand(OS, /*PrintType=*/false);
  } else if (auto *I = dyn_cast<Instruction>(V))
    Val = I->getOpcodeName();
}

DiagnosticInfoOptimizationBase::Argument::Argument(StringRef Key, const Type *T)
    : Key(Key) {
  raw_string_ostream OS(Val);
  OS << *T;
}

DiagnosticInfoOptimizationBase::Argument::Argument(StringRef Key, int N)
    : Key(Key), Val(itostr(N)) {}

DiagnosticInfoOptimizationBase::Argument::Argument(StringRef Key, unsigned N)
    : Key(Key), Val(utostr(N)) {}

void DiagnosticInfoOptimizationBase::print(DiagnosticPrinter &DP) const {
  DP << getLocationStr() << ": " << getMsg();
  if (Hotness)
    DP << " (hotness: " << *Hotness << ")";
}

OptimizationRemark::OptimizationRemark(const char *PassName,
                                       StringRef RemarkName,
                                       const DiagnosticLocation &Loc,
                                       const Value *CodeRegion)
    : DiagnosticInfoIROptimization(
          DK_OptimizationRemark, DS_Remark, PassName, RemarkName,
          *cast<BasicBlock>(CodeRegion)->getParent(), Loc, CodeRegion) {}

OptimizationRemark::OptimizationRemark(const char *PassName,
                                       StringRef RemarkName,
                                       const Instruction *Inst)
    : DiagnosticInfoIROptimization(DK_OptimizationRemark, DS_Remark, PassName,
                                   RemarkName, *Inst->getParent()->getParent(),
                                   Inst->getDebugLoc(), Inst->getParent()) {}

// Helper to allow for an assert before attempting to return an invalid
// reference.
static const BasicBlock &getFirstFunctionBlock(const Function *Func) {
  assert(!Func->empty() && "Function does not have a body");
  return Func->front();
}

OptimizationRemark::OptimizationRemark(const char *PassName,
                                       StringRef RemarkName,
                                       const Function *Func)
    : DiagnosticInfoIROptimization(DK_OptimizationRemark, DS_Remark, PassName,
                                   RemarkName, *Func, Func->getSubprogram(),
                                   &getFirstFunctionBlock(Func)) {}

bool OptimizationRemark::isEnabled(StringRef PassName) {
  return PassRemarksOptLoc.Pattern &&
         PassRemarksOptLoc.Pattern->match(PassName);
}

OptimizationRemarkMissed::OptimizationRemarkMissed(
    const char *PassName, StringRef RemarkName, const DiagnosticLocation &Loc,
    const Value *CodeRegion)
    : DiagnosticInfoIROptimization(
          DK_OptimizationRemarkMissed, DS_Remark, PassName, RemarkName,
          *cast<BasicBlock>(CodeRegion)->getParent(), Loc, CodeRegion) {}

OptimizationRemarkMissed::OptimizationRemarkMissed(const char *PassName,
                                                   StringRef RemarkName,
                                                   const Instruction *Inst)
    : DiagnosticInfoIROptimization(DK_OptimizationRemarkMissed, DS_Remark,
                                   PassName, RemarkName,
                                   *Inst->getParent()->getParent(),
                                   Inst->getDebugLoc(), Inst->getParent()) {}

bool OptimizationRemarkMissed::isEnabled(StringRef PassName) {
  return PassRemarksMissedOptLoc.Pattern &&
         PassRemarksMissedOptLoc.Pattern->match(PassName);
}

OptimizationRemarkAnalysis::OptimizationRemarkAnalysis(
    const char *PassName, StringRef RemarkName, const DiagnosticLocation &Loc,
    const Value *CodeRegion)
    : DiagnosticInfoIROptimization(
          DK_OptimizationRemarkAnalysis, DS_Remark, PassName, RemarkName,
          *cast<BasicBlock>(CodeRegion)->getParent(), Loc, CodeRegion) {}

OptimizationRemarkAnalysis::OptimizationRemarkAnalysis(const char *PassName,
                                                       StringRef RemarkName,
                                                       const Instruction *Inst)
    : DiagnosticInfoIROptimization(DK_OptimizationRemarkAnalysis, DS_Remark,
                                   PassName, RemarkName,
                                   *Inst->getParent()->getParent(),
                                   Inst->getDebugLoc(), Inst->getParent()) {}

OptimizationRemarkAnalysis::OptimizationRemarkAnalysis(
    enum DiagnosticKind Kind, const char *PassName, StringRef RemarkName,
    const DiagnosticLocation &Loc, const Value *CodeRegion)
    : DiagnosticInfoIROptimization(Kind, DS_Remark, PassName, RemarkName,
                                   *cast<BasicBlock>(CodeRegion)->getParent(),
                                   Loc, CodeRegion) {}

bool OptimizationRemarkAnalysis::isEnabled(StringRef PassName) {
  return PassRemarksAnalysisOptLoc.Pattern &&
         PassRemarksAnalysisOptLoc.Pattern->match(PassName);
}

void DiagnosticInfoMIRParser::print(DiagnosticPrinter &DP) const {
  DP << Diagnostic;
}

void llvm::emitOptimizationRemark(LLVMContext &Ctx, const char *PassName,
                                  const Function &Fn,
                                  const DiagnosticLocation &Loc,
                                  const Twine &Msg) {
  Ctx.diagnose(OptimizationRemark(PassName, Fn, Loc, Msg));
}

void llvm::emitOptimizationRemarkMissed(LLVMContext &Ctx, const char *PassName,
                                        const Function &Fn,
                                        const DiagnosticLocation &Loc,
                                        const Twine &Msg) {
  Ctx.diagnose(OptimizationRemarkMissed(PassName, Fn, Loc, Msg));
}

void llvm::emitOptimizationRemarkAnalysis(LLVMContext &Ctx,
                                          const char *PassName,
                                          const Function &Fn,
                                          const DiagnosticLocation &Loc,
                                          const Twine &Msg) {
  Ctx.diagnose(OptimizationRemarkAnalysis(PassName, Fn, Loc, Msg));
}

void llvm::emitOptimizationRemarkAnalysisFPCommute(
    LLVMContext &Ctx, const char *PassName, const Function &Fn,
    const DiagnosticLocation &Loc, const Twine &Msg) {
  Ctx.diagnose(OptimizationRemarkAnalysisFPCommute(PassName, Fn, Loc, Msg));
}

void llvm::emitOptimizationRemarkAnalysisAliasing(LLVMContext &Ctx,
                                                  const char *PassName,
                                                  const Function &Fn,
                                                  const DiagnosticLocation &Loc,
                                                  const Twine &Msg) {
  Ctx.diagnose(OptimizationRemarkAnalysisAliasing(PassName, Fn, Loc, Msg));
}

DiagnosticInfoOptimizationFailure::DiagnosticInfoOptimizationFailure(
    const char *PassName, StringRef RemarkName, const DiagnosticLocation &Loc,
    const Value *CodeRegion)
    : DiagnosticInfoIROptimization(
          DK_OptimizationFailure, DS_Warning, PassName, RemarkName,
          *cast<BasicBlock>(CodeRegion)->getParent(), Loc, CodeRegion) {}

bool DiagnosticInfoOptimizationFailure::isEnabled() const {
  // Only print warnings.
  return getSeverity() == DS_Warning;
}

void DiagnosticInfoUnsupported::print(DiagnosticPrinter &DP) const {
  std::string Str;
  raw_string_ostream OS(Str);

  OS << getLocationStr() << ": in function " << getFunction().getName() << ' '
     << *getFunction().getFunctionType() << ": " << Msg << '\n';
  OS.flush();
  DP << Str;
}

void DiagnosticInfoISelFallback::print(DiagnosticPrinter &DP) const {
  DP << "Instruction selection used fallback path for " << getFunction();
}

DiagnosticInfoOptimizationBase &DiagnosticInfoOptimizationBase::
operator<<(StringRef S) {
  Args.emplace_back(S);
  return *this;
}

DiagnosticInfoOptimizationBase &DiagnosticInfoOptimizationBase::
operator<<(Argument A) {
  Args.push_back(std::move(A));
  return *this;
}

DiagnosticInfoOptimizationBase &DiagnosticInfoOptimizationBase::
operator<<(setIsVerbose V) {
  IsVerbose = true;
  return *this;
}

DiagnosticInfoOptimizationBase &DiagnosticInfoOptimizationBase::
operator<<(setExtraArgs EA) {
  FirstExtraArgIndex = Args.size();
  return *this;
}

std::string DiagnosticInfoOptimizationBase::getMsg() const {
  std::string Str;
  raw_string_ostream OS(Str);
  for (const DiagnosticInfoOptimizationBase::Argument &Arg :
       make_range(Args.begin(), FirstExtraArgIndex == -1
                                    ? Args.end()
                                    : Args.begin() + FirstExtraArgIndex))
    OS << Arg.Val;
  return OS.str();
}