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//===-- llvm-dis.cpp - The low-level LLVM disassembler --------------------===//
//
// 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 utility may be invoked in the following manner:
// llvm-dis [options] - Read LLVM bitcode from stdin, write asm to stdout
// llvm-dis [options] x.bc - Read LLVM bitcode from the x.bc file, write asm
// to the x.ll file.
// Options:
// --help - Output information about command line switches
//
//===----------------------------------------------------------------------===//
#include "llvm/Bitcode/BitcodeReader.h"
#include "llvm/IR/AssemblyAnnotationWriter.h"
#include "llvm/IR/DebugInfo.h"
#include "llvm/IR/DiagnosticInfo.h"
#include "llvm/IR/DiagnosticPrinter.h"
#include "llvm/IR/IntrinsicInst.h"
#include "llvm/IR/LLVMContext.h"
#include "llvm/IR/Module.h"
#include "llvm/IR/ModuleSummaryIndex.h"
#include "llvm/IR/Type.h"
#include "llvm/Support/CommandLine.h"
#include "llvm/Support/Error.h"
#include "llvm/Support/FileSystem.h"
#include "llvm/Support/FormattedStream.h"
#include "llvm/Support/InitLLVM.h"
#include "llvm/Support/MemoryBuffer.h"
#include "llvm/Support/ToolOutputFile.h"
#include "llvm/Support/WithColor.h"
#include <system_error>
using namespace llvm;
static cl::OptionCategory DisCategory("Disassembler Options");
static cl::list<std::string> InputFilenames(cl::Positional,
cl::desc("[input bitcode]..."),
cl::cat(DisCategory));
static cl::opt<std::string> OutputFilename("o",
cl::desc("Override output filename"),
cl::value_desc("filename"),
cl::cat(DisCategory));
static cl::opt<bool> Force("f", cl::desc("Enable binary output on terminals"),
cl::cat(DisCategory));
static cl::opt<bool> DontPrint("disable-output",
cl::desc("Don't output the .ll file"),
cl::Hidden, cl::cat(DisCategory));
static cl::opt<bool>
SetImporting("set-importing",
cl::desc("Set lazy loading to pretend to import a module"),
cl::Hidden, cl::cat(DisCategory));
static cl::opt<bool>
ShowAnnotations("show-annotations",
cl::desc("Add informational comments to the .ll file"),
cl::cat(DisCategory));
static cl::opt<bool> PreserveAssemblyUseListOrder(
"preserve-ll-uselistorder",
cl::desc("Preserve use-list order when writing LLVM assembly."),
cl::init(false), cl::Hidden, cl::cat(DisCategory));
static cl::opt<bool>
MaterializeMetadata("materialize-metadata",
cl::desc("Load module without materializing metadata, "
"then materialize only the metadata"),
cl::cat(DisCategory));
static cl::opt<bool> PrintThinLTOIndexOnly(
"print-thinlto-index-only",
cl::desc("Only read thinlto index and print the index as LLVM assembly."),
cl::init(false), cl::Hidden, cl::cat(DisCategory));
namespace {
static void printDebugLoc(const DebugLoc &DL, formatted_raw_ostream &OS) {
OS << DL.getLine() << ":" << DL.getCol();
if (DILocation *IDL = DL.getInlinedAt()) {
OS << "@";
printDebugLoc(IDL, OS);
}
}
class CommentWriter : public AssemblyAnnotationWriter {
public:
void emitFunctionAnnot(const Function *F,
formatted_raw_ostream &OS) override {
OS << "; [#uses=" << F->getNumUses() << ']'; // Output # uses
OS << '\n';
}
void printInfoComment(const Value &V, formatted_raw_ostream &OS) override {
bool Padded = false;
if (!V.getType()->isVoidTy()) {
OS.PadToColumn(50);
Padded = true;
// Output # uses and type
OS << "; [#uses=" << V.getNumUses() << " type=" << *V.getType() << "]";
}
if (const Instruction *I = dyn_cast<Instruction>(&V)) {
if (const DebugLoc &DL = I->getDebugLoc()) {
if (!Padded) {
OS.PadToColumn(50);
Padded = true;
OS << ";";
}
OS << " [debug line = ";
printDebugLoc(DL,OS);
OS << "]";
}
if (const DbgDeclareInst *DDI = dyn_cast<DbgDeclareInst>(I)) {
if (!Padded) {
OS.PadToColumn(50);
OS << ";";
}
OS << " [debug variable = " << DDI->getVariable()->getName() << "]";
}
else if (const DbgValueInst *DVI = dyn_cast<DbgValueInst>(I)) {
if (!Padded) {
OS.PadToColumn(50);
OS << ";";
}
OS << " [debug variable = " << DVI->getVariable()->getName() << "]";
}
}
}
};
struct LLVMDisDiagnosticHandler : public DiagnosticHandler {
char *Prefix;
LLVMDisDiagnosticHandler(char *PrefixPtr) : Prefix(PrefixPtr) {}
bool handleDiagnostics(const DiagnosticInfo &DI) override {
raw_ostream &OS = errs();
OS << Prefix << ": ";
switch (DI.getSeverity()) {
case DS_Error: WithColor::error(OS); break;
case DS_Warning: WithColor::warning(OS); break;
case DS_Remark: OS << "remark: "; break;
case DS_Note: WithColor::note(OS); break;
}
DiagnosticPrinterRawOStream DP(OS);
DI.print(DP);
OS << '\n';
if (DI.getSeverity() == DS_Error)
exit(1);
return true;
}
};
} // end anon namespace
static ExitOnError ExitOnErr;
int main(int argc, char **argv) {
InitLLVM X(argc, argv);
ExitOnErr.setBanner(std::string(argv[0]) + ": error: ");
cl::HideUnrelatedOptions({&DisCategory, &getColorCategory()});
cl::ParseCommandLineOptions(argc, argv, "llvm .bc -> .ll disassembler\n");
LLVMContext Context;
Context.setDiagnosticHandler(
std::make_unique<LLVMDisDiagnosticHandler>(argv[0]));
if (InputFilenames.size() < 1) {
InputFilenames.push_back("-");
} else if (InputFilenames.size() > 1 && !OutputFilename.empty()) {
errs()
<< "error: output file name cannot be set for multiple input files\n";
return 1;
}
for (std::string InputFilename : InputFilenames) {
ErrorOr<std::unique_ptr<MemoryBuffer>> BufferOrErr =
MemoryBuffer::getFileOrSTDIN(InputFilename);
if (std::error_code EC = BufferOrErr.getError()) {
WithColor::error() << InputFilename << ": " << EC.message() << '\n';
return 1;
}
std::unique_ptr<MemoryBuffer> MB = std::move(BufferOrErr.get());
BitcodeFileContents IF = ExitOnErr(llvm::getBitcodeFileContents(*MB));
const size_t N = IF.Mods.size();
if (OutputFilename == "-" && N > 1)
errs() << "only single module bitcode files can be written to stdout\n";
for (size_t I = 0; I < N; ++I) {
BitcodeModule MB = IF.Mods[I];
std::unique_ptr<Module> M;
if (!PrintThinLTOIndexOnly) {
M = ExitOnErr(
MB.getLazyModule(Context, MaterializeMetadata, SetImporting));
if (MaterializeMetadata)
ExitOnErr(M->materializeMetadata());
else
ExitOnErr(M->materializeAll());
}
BitcodeLTOInfo LTOInfo = ExitOnErr(MB.getLTOInfo());
std::unique_ptr<ModuleSummaryIndex> Index;
if (LTOInfo.HasSummary)
Index = ExitOnErr(MB.getSummary());
std::string FinalFilename(OutputFilename);
// Just use stdout. We won't actually print anything on it.
if (DontPrint)
FinalFilename = "-";
if (FinalFilename.empty()) { // Unspecified output, infer it.
if (InputFilename == "-") {
FinalFilename = "-";
} else {
StringRef IFN = InputFilename;
FinalFilename = (IFN.endswith(".bc") ? IFN.drop_back(3) : IFN).str();
if (N > 1)
FinalFilename += std::string(".") + std::to_string(I);
FinalFilename += ".ll";
}
} else {
if (N > 1)
FinalFilename += std::string(".") + std::to_string(I);
}
std::error_code EC;
std::unique_ptr<ToolOutputFile> Out(
new ToolOutputFile(FinalFilename, EC, sys::fs::OF_TextWithCRLF));
if (EC) {
errs() << EC.message() << '\n';
return 1;
}
std::unique_ptr<AssemblyAnnotationWriter> Annotator;
if (ShowAnnotations)
Annotator.reset(new CommentWriter());
// All that llvm-dis does is write the assembly to a file.
if (!DontPrint) {
if (M)
M->print(Out->os(), Annotator.get(), PreserveAssemblyUseListOrder);
if (Index)
Index->print(Out->os());
}
// Declare success.
Out->keep();
}
}
return 0;
}
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