[llvm-commits] [llvm] r130409 - /llvm/trunk/lib/VMCore/AsmWriter.cpp
Devang Patel
dpatel at apple.com
Thu Apr 28 10:41:38 PDT 2011
Author: dpatel
Date: Thu Apr 28 12:41:38 2011
New Revision: 130409
URL: http://llvm.org/viewvc/llvm-project?rev=130409&view=rev
Log:
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.
Modified:
llvm/trunk/lib/VMCore/AsmWriter.cpp
Modified: llvm/trunk/lib/VMCore/AsmWriter.cpp
URL: http://llvm.org/viewvc/llvm-project/llvm/trunk/lib/VMCore/AsmWriter.cpp?rev=130409&r1=130408&r2=130409&view=diff
==============================================================================
--- llvm/trunk/lib/VMCore/AsmWriter.cpp (original)
+++ llvm/trunk/lib/VMCore/AsmWriter.cpp Thu Apr 28 12:41:38 2011
@@ -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 @@
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 @@
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() << "]";
+ }
+ }
}
}
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