llvm/lib/Analysis/DbgInfoPrinter.cpp

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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/Pass.h"
#include "llvm/Function.h"
#include "llvm/Module.h"
#include "llvm/Value.h"
#include "llvm/IntrinsicInst.h"
#include "llvm/Analysis/DebugInfo.h"
#include "llvm/Analysis/Passes.h"
#include "llvm/Analysis/ValueTracking.h"
#include "llvm/Support/CFG.h"
#include "llvm/Support/Compiler.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 {
struct VISIBILITY_HIDDEN PrintDbgInfo : public FunctionPass {
private:
raw_ostream &Out;
void printStopPoint(const DbgStopPointInst *DSI);
void printFuncStart(const DbgFuncStartInst *FS);
void printVariableDeclaration(const Value *V);
public:
static char ID; // Pass identification
PrintDbgInfo() : FunctionPass(&ID), Out(outs()) {}
virtual bool runOnFunction(Function &F);
virtual void getAnalysisUsage(AnalysisUsage &AU) const {
AU.setPreservesAll();
}
};
char PrintDbgInfo::ID = 0;
static RegisterPass<PrintDbgInfo> X("print-dbginfo",
"Print debug info in human readable form");
}
FunctionPass *llvm::createDbgInfoPrinterPass() { return new PrintDbgInfo(); }
void PrintDbgInfo::printVariableDeclaration(const Value *V)
{
if(const DbgDeclareInst* DDI = findDbgDeclare(V)) {
DIVariable Var(cast<GlobalVariable>(DDI->getVariable()));
Out << "; variable " << Var.getName()
<< " of type " << Var.getType().getName()
<< " at line " << Var.getLineNumber() << "\n";
}
}
void PrintDbgInfo::printStopPoint(const DbgStopPointInst *DSI)
{
if (PrintDirectory) {
std::string dir;
GetConstantStringInfo(DSI->getDirectory(), dir);
Out << dir << "/";
}
std::string file;
GetConstantStringInfo(DSI->getFileName(), file);
Out << file << ":" << DSI->getLine();
if (unsigned Col = DSI->getColumn()) {
Out << ":" << Col;
}
}
void PrintDbgInfo::printFuncStart(const DbgFuncStartInst *FS)
{
DISubprogram Subprogram(cast<GlobalVariable>(FS->getSubprogram()));
Out << ";fully qualified function name: " << Subprogram.getDisplayName()
<< " return type: " << Subprogram.getType().getName()
<< " at line " << Subprogram.getLineNumber()
<< "\n\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;
const DbgStopPointInst *DSI = findBBStopPoint(BB);
Out << BB->getName();
Out << ":";
if (DSI) {
Out << "; (";
printStopPoint(DSI);
Out << ")";
}
Out << "\n";
// A dbgstoppoint's information is valid until we encounter a new one.
const DbgStopPointInst *LastDSP = DSI;
bool printed = DSI != 0;
for (BasicBlock::const_iterator i = BB->begin(), e = BB->end(); i != e; ++i) {
if (isa<DbgInfoIntrinsic>(i)) {
if ((DSI = dyn_cast<DbgStopPointInst>(i))) {
if (DSI->getContext() == LastDSP->getContext() &&
DSI->getLineValue() == LastDSP->getLineValue() &&
DSI->getColumnValue() == LastDSP->getColumnValue()) {
// Don't print same location twice.
continue;
}
LastDSP = cast<DbgStopPointInst>(i);
// Don't print consecutive stoppoints, use a flag
// to know which one we printed.
printed = false;
} else if (const DbgFuncStartInst *FS = dyn_cast<DbgFuncStartInst>(i)) {
printFuncStart(FS);
}
} else {
if (!printed && LastDSP) {
Out << "; ";
printStopPoint(LastDSP);
Out << "\n";
printed = true;
}
Out << *i;
printVariableDeclaration(i);
}
}
}
return false;
}