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//===- DbgInfoPrinter.cpp - Print debug info in a human readable form ------==//
//
// The LLVM Compiler Infrastructure
//
// This file is distributed under the University of Illinois Open Source
// License. See LICENSE.TXT for details.
//
//===----------------------------------------------------------------------===//
//
// This file implements a pass that prints instructions, and associated debug
// info:
//
// - source/line/col information
// - original variable name
// - original type name
//
//===----------------------------------------------------------------------===//
#include "llvm/Analysis/Passes.h"
#include "llvm/Assembly/Writer.h"
#include "llvm/DebugInfo.h"
#include "llvm/IR/Function.h"
#include "llvm/IR/IntrinsicInst.h"
#include "llvm/IR/Metadata.h"
#include "llvm/IR/Module.h"
#include "llvm/Pass.h"
#include "llvm/Support/CFG.h"
#include "llvm/Support/CommandLine.h"
#include "llvm/Support/raw_ostream.h"
using namespace llvm;
static cl::opt<bool>
PrintDirectory("print-fullpath",
cl::desc("Print fullpath when printing debug info"),
cl::Hidden);
namespace {
class PrintDbgInfo : public FunctionPass {
raw_ostream &Out;
void printVariableDeclaration(const Value *V);
public:
static char ID; // Pass identification
PrintDbgInfo() : FunctionPass(ID), Out(errs()) {
initializePrintDbgInfoPass(*PassRegistry::getPassRegistry());
}
virtual bool runOnFunction(Function &F);
virtual void getAnalysisUsage(AnalysisUsage &AU) const {
AU.setPreservesAll();
}
};
char PrintDbgInfo::ID = 0;
}
INITIALIZE_PASS(PrintDbgInfo, "print-dbginfo",
"Print debug info in human readable form", false, false)
FunctionPass *llvm::createDbgInfoPrinterPass() { return new PrintDbgInfo(); }
/// Find the debug info descriptor corresponding to this global variable.
static Value *findDbgGlobalDeclare(GlobalVariable *V) {
const Module *M = V->getParent();
NamedMDNode *NMD = M->getNamedMetadata("llvm.dbg.gv");
if (!NMD)
return 0;
for (unsigned i = 0, e = NMD->getNumOperands(); i != e; ++i) {
DIDescriptor DIG(cast<MDNode>(NMD->getOperand(i)));
if (!DIG.isGlobalVariable())
continue;
if (DIGlobalVariable(DIG).getGlobal() == V)
return DIG;
}
return 0;
}
/// Find the debug info descriptor corresponding to this function.
static Value *findDbgSubprogramDeclare(Function *V) {
const Module *M = V->getParent();
NamedMDNode *NMD = M->getNamedMetadata("llvm.dbg.sp");
if (!NMD)
return 0;
for (unsigned i = 0, e = NMD->getNumOperands(); i != e; ++i) {
DIDescriptor DIG(cast<MDNode>(NMD->getOperand(i)));
if (!DIG.isSubprogram())
continue;
if (DISubprogram(DIG).getFunction() == V)
return DIG;
}
return 0;
}
/// Finds the llvm.dbg.declare intrinsic corresponding to this value if any.
/// It looks through pointer casts too.
static const DbgDeclareInst *findDbgDeclare(const Value *V) {
V = V->stripPointerCasts();
if (!isa<Instruction>(V) && !isa<Argument>(V))
return 0;
const Function *F = NULL;
if (const Instruction *I = dyn_cast<Instruction>(V))
F = I->getParent()->getParent();
else if (const Argument *A = dyn_cast<Argument>(V))
F = A->getParent();
for (Function::const_iterator FI = F->begin(), FE = F->end(); FI != FE; ++FI)
for (BasicBlock::const_iterator BI = (*FI).begin(), BE = (*FI).end();
BI != BE; ++BI)
if (const DbgDeclareInst *DDI = dyn_cast<DbgDeclareInst>(BI))
if (DDI->getAddress() == V)
return DDI;
return 0;
}
static bool getLocationInfo(const Value *V, std::string &DisplayName,
std::string &Type, unsigned &LineNo,
std::string &File, std::string &Dir) {
DICompileUnit Unit;
DIType TypeD;
if (GlobalVariable *GV = dyn_cast<GlobalVariable>(const_cast<Value*>(V))) {
Value *DIGV = findDbgGlobalDeclare(GV);
if (!DIGV) return false;
DIGlobalVariable Var(cast<MDNode>(DIGV));
StringRef D = Var.getDisplayName();
if (!D.empty())
DisplayName = D;
LineNo = Var.getLineNumber();
Unit = Var.getCompileUnit();
TypeD = Var.getType();
} else if (Function *F = dyn_cast<Function>(const_cast<Value*>(V))){
Value *DIF = findDbgSubprogramDeclare(F);
if (!DIF) return false;
DISubprogram Var(cast<MDNode>(DIF));
StringRef D = Var.getDisplayName();
if (!D.empty())
DisplayName = D;
LineNo = Var.getLineNumber();
Unit = Var.getCompileUnit();
TypeD = Var.getType();
} else {
const DbgDeclareInst *DDI = findDbgDeclare(V);
if (!DDI) return false;
DIVariable Var(cast<MDNode>(DDI->getVariable()));
StringRef D = Var.getName();
if (!D.empty())
DisplayName = D;
LineNo = Var.getLineNumber();
Unit = Var.getCompileUnit();
TypeD = Var.getType();
}
StringRef T = TypeD.getName();
if (!T.empty())
Type = T;
StringRef F = Unit.getFilename();
if (!F.empty())
File = F;
StringRef D = Unit.getDirectory();
if (!D.empty())
Dir = D;
return true;
}
void PrintDbgInfo::printVariableDeclaration(const Value *V) {
std::string DisplayName, File, Directory, Type;
unsigned LineNo = 0;
if (!getLocationInfo(V, DisplayName, Type, LineNo, File, Directory))
return;
Out << "; ";
WriteAsOperand(Out, V, false, 0);
if (isa<Function>(V))
Out << " is function " << DisplayName
<< " of type " << Type << " declared at ";
else
Out << " is variable " << DisplayName
<< " of type " << Type << " declared at ";
if (PrintDirectory)
Out << Directory << "/";
Out << File << ":" << LineNo << "\n";
}
bool PrintDbgInfo::runOnFunction(Function &F) {
if (F.isDeclaration())
return false;
Out << "function " << F.getName() << "\n\n";
for (Function::iterator I = F.begin(), E = F.end(); I != E; ++I) {
BasicBlock *BB = I;
if (I != F.begin() && (pred_begin(BB) == pred_end(BB)))
// Skip dead blocks.
continue;
Out << BB->getName();
Out << ":";
Out << "\n";
for (BasicBlock::const_iterator i = BB->begin(), e = BB->end();
i != e; ++i) {
printVariableDeclaration(i);
if (const User *U = dyn_cast<User>(i)) {
for(unsigned i=0;i<U->getNumOperands();i++)
printVariableDeclaration(U->getOperand(i));
}
}
}
return false;
}
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