llvm-project/llvm/tools/llvm-dis/llvm-dis.cpp

206 lines
6.3 KiB
C++

//===-- llvm-dis.cpp - The low-level LLVM disassembler --------------------===//
//
// The LLVM Compiler Infrastructure
//
// This file is distributed under the University of Illinois Open Source
// License. See LICENSE.TXT for details.
//
//===----------------------------------------------------------------------===//
//
// 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/IR/LLVMContext.h"
#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/Module.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/ManagedStatic.h"
#include "llvm/Support/MemoryBuffer.h"
#include "llvm/Support/PrettyStackTrace.h"
#include "llvm/Support/Signals.h"
#include "llvm/Support/ToolOutputFile.h"
#include <system_error>
using namespace llvm;
static cl::opt<std::string>
InputFilename(cl::Positional, cl::desc("<input bitcode>"), cl::init("-"));
static cl::opt<std::string>
OutputFilename("o", cl::desc("Override output filename"),
cl::value_desc("filename"));
static cl::opt<bool>
Force("f", cl::desc("Enable binary output on terminals"));
static cl::opt<bool>
DontPrint("disable-output", cl::desc("Don't output the .ll file"), cl::Hidden);
static cl::opt<bool>
ShowAnnotations("show-annotations",
cl::desc("Add informational comments to the .ll file"));
static cl::opt<bool> PreserveAssemblyUseListOrder(
"preserve-ll-uselistorder",
cl::desc("Preserve use-list order when writing LLVM assembly."),
cl::init(false), cl::Hidden);
static cl::opt<bool>
MaterializeMetadata("materialize-metadata",
cl::desc("Load module without materializing metadata, "
"then materialize only the metadata"));
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() << "]";
}
}
}
};
} // end anon namespace
static void diagnosticHandler(const DiagnosticInfo &DI, void *Context) {
raw_ostream &OS = errs();
OS << (char *)Context << ": ";
switch (DI.getSeverity()) {
case DS_Error: OS << "error: "; break;
case DS_Warning: OS << "warning: "; break;
case DS_Remark: OS << "remark: "; break;
case DS_Note: OS << "note: "; break;
}
DiagnosticPrinterRawOStream DP(OS);
DI.print(DP);
OS << '\n';
if (DI.getSeverity() == DS_Error)
exit(1);
}
static ExitOnError ExitOnErr;
static std::unique_ptr<Module> openInputFile(LLVMContext &Context) {
std::unique_ptr<MemoryBuffer> MB =
ExitOnErr(errorOrToExpected(MemoryBuffer::getFileOrSTDIN(InputFilename)));
std::unique_ptr<Module> M =
ExitOnErr(getOwningLazyBitcodeModule(std::move(MB), Context,
/*ShouldLazyLoadMetadata=*/true));
if (MaterializeMetadata)
ExitOnErr(M->materializeMetadata());
else
ExitOnErr(M->materializeAll());
return M;
}
int main(int argc, char **argv) {
// Print a stack trace if we signal out.
sys::PrintStackTraceOnErrorSignal(argv[0]);
PrettyStackTraceProgram X(argc, argv);
ExitOnErr.setBanner(std::string(argv[0]) + ": error: ");
LLVMContext Context;
llvm_shutdown_obj Y; // Call llvm_shutdown() on exit.
Context.setDiagnosticHandler(diagnosticHandler, argv[0]);
cl::ParseCommandLineOptions(argc, argv, "llvm .bc -> .ll disassembler\n");
std::unique_ptr<Module> M = openInputFile(Context);
// Just use stdout. We won't actually print anything on it.
if (DontPrint)
OutputFilename = "-";
if (OutputFilename.empty()) { // Unspecified output, infer it.
if (InputFilename == "-") {
OutputFilename = "-";
} else {
StringRef IFN = InputFilename;
OutputFilename = (IFN.endswith(".bc") ? IFN.drop_back(3) : IFN).str();
OutputFilename += ".ll";
}
}
std::error_code EC;
std::unique_ptr<tool_output_file> Out(
new tool_output_file(OutputFilename, EC, sys::fs::F_None));
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)
M->print(Out->os(), Annotator.get(), PreserveAssemblyUseListOrder);
// Declare success.
Out->keep();
return 0;
}