[llvm] r229181 - [dsymutil] Add a few generic helper methods.
Frederic Riss
friss at apple.com
Fri Feb 13 15:18:29 PST 2015
Author: friss
Date: Fri Feb 13 17:18:29 2015
New Revision: 229181
URL: http://llvm.org/viewvc/llvm-project?rev=229181&view=rev
Log:
[dsymutil] Add a few generic helper methods.
To be used in subsequent commits (separated to keep only core logic
in the follow-ups).
Modified:
llvm/trunk/tools/dsymutil/DwarfLinker.cpp
Modified: llvm/trunk/tools/dsymutil/DwarfLinker.cpp
URL: http://llvm.org/viewvc/llvm-project/llvm/trunk/tools/dsymutil/DwarfLinker.cpp?rev=229181&r1=229180&r2=229181&view=diff
==============================================================================
--- llvm/trunk/tools/dsymutil/DwarfLinker.cpp (original)
+++ llvm/trunk/tools/dsymutil/DwarfLinker.cpp Fri Feb 13 17:18:29 2015
@@ -12,6 +12,7 @@
#include "dsymutil.h"
#include "llvm/DebugInfo/DWARF/DWARFContext.h"
#include "llvm/DebugInfo/DWARF/DWARFDebugInfoEntry.h"
+#include "llvm/DebugInfo/DWARF/DWARFFormValue.h"
#include "llvm/Object/MachO.h"
#include <string>
@@ -112,6 +113,21 @@ private:
const object::MachOObjectFile &Obj,
const DebugMapObject &DMO);
/// @}
+
+ /// \defgroup Helpers Various helper methods.
+ ///
+ /// @{
+ const DWARFDebugInfoEntryMinimal *
+ resolveDIEReference(DWARFFormValue &RefValue, const DWARFUnit &Unit,
+ const DWARFDebugInfoEntryMinimal &DIE,
+ CompileUnit *&ReferencedCU);
+
+ CompileUnit *getUnitForOffset(unsigned Offset);
+
+ void reportWarning(const Twine &Warning, const DWARFUnit *Unit = nullptr,
+ const DWARFDebugInfoEntryMinimal *DIE = nullptr);
+ /// @}
+
private:
std::string OutputFilename;
bool Verbose;
@@ -119,8 +135,57 @@ private:
/// The units of the current debug map object.
std::vector<CompileUnit> Units;
+
+ /// The debug map object curently under consideration.
+ DebugMapObject *CurrentDebugObject;
};
+/// \brief Similar to DWARFUnitSection::getUnitForOffset(), but
+/// returning our CompileUnit object instead.
+CompileUnit *DwarfLinker::getUnitForOffset(unsigned Offset) {
+ auto CU =
+ std::upper_bound(Units.begin(), Units.end(), Offset,
+ [](uint32_t LHS, const CompileUnit &RHS) {
+ return LHS < RHS.getOrigUnit().getNextUnitOffset();
+ });
+ return CU != Units.end() ? &*CU : nullptr;
+}
+
+/// \brief Resolve the DIE attribute reference that has been
+/// extracted in \p RefValue. The resulting DIE migh be in another
+/// CompileUnit which is stored into \p ReferencedCU.
+/// \returns null if resolving fails for any reason.
+const DWARFDebugInfoEntryMinimal *DwarfLinker::resolveDIEReference(
+ DWARFFormValue &RefValue, const DWARFUnit &Unit,
+ const DWARFDebugInfoEntryMinimal &DIE, CompileUnit *&RefCU) {
+ assert(RefValue.isFormClass(DWARFFormValue::FC_Reference));
+ uint64_t RefOffset = *RefValue.getAsReference(&Unit);
+
+ if ((RefCU = getUnitForOffset(RefOffset)))
+ if (const auto *RefDie = RefCU->getOrigUnit().getDIEForOffset(RefOffset))
+ return RefDie;
+
+ reportWarning("could not find referenced DIE", &Unit, &DIE);
+ return nullptr;
+}
+
+/// \brief Report a warning to the user, optionaly including
+/// information about a specific \p DIE related to the warning.
+void DwarfLinker::reportWarning(const Twine &Warning, const DWARFUnit *Unit,
+ const DWARFDebugInfoEntryMinimal *DIE) {
+ if (CurrentDebugObject)
+ errs() << Twine("while processing ") +
+ CurrentDebugObject->getObjectFilename() + ":\n";
+ errs() << Twine("warning: ") + Warning + "\n";
+
+ if (!Verbose || !DIE)
+ return;
+
+ errs() << " in DIE:\n";
+ DIE->dump(errs(), const_cast<DWARFUnit *>(Unit), 0 /* RecurseDepth */,
+ 6 /* Indent */);
+}
+
/// \brief Recursive helper to gather the child->parent relationships in the
/// original compile unit.
void GatherDIEParents(const DWARFDebugInfoEntryMinimal *DIE, unsigned ParentIdx,
@@ -160,7 +225,7 @@ void DwarfLinker::findValidRelocsMachO(c
unsigned RelocSize = 1 << Obj.getAnyRelocationLength(MachOReloc);
uint64_t Offset64;
if ((RelocSize != 4 && RelocSize != 8) || Reloc.getOffset(Offset64)) {
- errs() << "warning: unsupported relocation in debug_info section.\n";
+ reportWarning(" unsupported relocation in debug_info section.");
continue;
}
uint32_t Offset = Offset64;
@@ -171,7 +236,7 @@ void DwarfLinker::findValidRelocsMachO(c
if (Sym != Obj.symbol_end()) {
StringRef SymbolName;
if (Sym->getName(SymbolName)) {
- errs() << "warning: error getting relocation symbol name.\n";
+ reportWarning("error getting relocation symbol name.");
continue;
}
if (const auto *Mapping = DMO.lookupSymbol(SymbolName))
@@ -194,8 +259,7 @@ bool DwarfLinker::findValidRelocs(const
if (auto *MachOObj = dyn_cast<object::MachOObjectFile>(&Obj))
findValidRelocsMachO(Section, *MachOObj, DMO);
else
- errs() << "warning: unsupported object file type: " << Obj.getFileName()
- << '\n';
+ reportWarning(Twine("unsupported object file type: ") + Obj.getFileName());
if (ValidRelocs.empty())
return false;
@@ -235,11 +299,13 @@ bool DwarfLinker::link(const DebugMap &M
}
for (const auto &Obj : Map.objects()) {
+ CurrentDebugObject = Obj.get();
+
if (Verbose)
outs() << "DEBUG MAP OBJECT: " << Obj->getObjectFilename() << "\n";
auto ErrOrObj = BinHolder.GetObjectFile(Obj->getObjectFilename());
if (std::error_code EC = ErrOrObj.getError()) {
- errs() << Obj->getObjectFilename() << ": " << EC.message() << "\n";
+ reportWarning(Twine(Obj->getObjectFilename()) + ": " + EC.message());
continue;
}
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