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Add command line option to print debug info in human readable form as comment in llvm IR output. This, i.e -enable-debug-info-comment, is very useful if you want to easily find out which optimization pass is losing line number information.

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git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@130409 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Devang Patel 2011-04-28 17:41:38 +00:00
parent 88e92cf16b
commit d78bfbc6bb
1 changed files with 55 additions and 0 deletions
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55
lib/VMCore/AsmWriter.cpp
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@ -32,6 +32,7 @@
#include "llvm/ADT/StringExtras.h"
#include "llvm/ADT/STLExtras.h"
#include "llvm/Support/CFG.h"
#include "llvm/Support/CommandLine.h"
#include "llvm/Support/Debug.h"
#include "llvm/Support/Dwarf.h"
#include "llvm/Support/ErrorHandling.h"
@ -41,6 +42,11 @@
#include <cctype>
using namespace llvm;
static cl::opt<bool>
EnableDebugInfoComment("enable-debug-info-comment", cl::Hidden,
cl::desc("Enable debug info comments"));
// Make virtual table appear in this compilation unit.
AssemblyAnnotationWriter::~AssemblyAnnotationWriter() {}
@ -1729,6 +1735,18 @@ void AssemblyWriter::printBasicBlock(const BasicBlock *BB) {
if (AnnotationWriter) AnnotationWriter->emitBasicBlockEndAnnot(BB, Out);
}
/// printDebugLoc - Print DebugLoc.
static void printDebugLoc(const DebugLoc &DL, formatted_raw_ostream &OS) {
OS << DL.getLine() << ":" << DL.getCol();
if (MDNode *N = DL.getInlinedAt(getGlobalContext())) {
DebugLoc IDL = DebugLoc::getFromDILocation(N);
if (!IDL.isUnknown()) {
OS << "@";
printDebugLoc(IDL,OS);
}
}
}
/// printInfoComment - Print a little comment after the instruction indicating
/// which slot it occupies.
///
@ -1736,6 +1754,43 @@ void AssemblyWriter::printInfoComment(const Value &V) {
if (AnnotationWriter) {
AnnotationWriter->printInfoComment(V, Out);
return;
} else if (EnableDebugInfoComment) {
bool Padded = false;
if (const Instruction *I = dyn_cast<Instruction>(&V)) {
const DebugLoc &DL = I->getDebugLoc();
if (!DL.isUnknown()) {
if (!Padded) {
Out.PadToColumn(50);
Padded = true;
Out << ";";
}
Out << " [debug line = ";
printDebugLoc(DL,Out);
Out << "]";
}
if (const DbgDeclareInst *DDI = dyn_cast<DbgDeclareInst>(I)) {
const MDNode *Var = DDI->getVariable();
if (!Padded) {
Out.PadToColumn(50);
Padded = true;
Out << ";";
}
if (Var && Var->getNumOperands() >= 2)
if (MDString *MDS = dyn_cast_or_null<MDString>(Var->getOperand(2)))
Out << " [debug variable = " << MDS->getString() << "]";
}
else if (const DbgValueInst *DVI = dyn_cast<DbgValueInst>(I)) {
const MDNode *Var = DVI->getVariable();
if (!Padded) {
Out.PadToColumn(50);
Padded = true;
Out << ";";
}
if (Var && Var->getNumOperands() >= 2)
if (MDString *MDS = dyn_cast_or_null<MDString>(Var->getOperand(2)))
Out << " [debug variable = " << MDS->getString() << "]";
}
}
}
}