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authorEric Christopher <echristo@gmail.com>2012-11-07 23:22:07 +0000
committerEric Christopher <echristo@gmail.com>2012-11-07 23:22:07 +0000
commit806e03d2381709ddfb5a8012729bbe6eae12caf5 (patch)
treed01da4fb8a09017a564b27968af88dc1fb82084d /tools/llvm-dwarfdump
parentb0319962cfdb18da38ef47da621f148fe144b092 (diff)
Add a relocation visitor to lib object. This works via caching relocated
values in a map that can be passed to consumers. Add a testcase that ensures this works for llvm-dwarfdump. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@167558 91177308-0d34-0410-b5e6-96231b3b80d8
Diffstat (limited to 'tools/llvm-dwarfdump')
-rw-r--r--tools/llvm-dwarfdump/llvm-dwarfdump.cpp59
1 files changed, 58 insertions, 1 deletions
diff --git a/tools/llvm-dwarfdump/llvm-dwarfdump.cpp b/tools/llvm-dwarfdump/llvm-dwarfdump.cpp
index 309bc4ecd46..e73300a0cd8 100644
--- a/tools/llvm-dwarfdump/llvm-dwarfdump.cpp
+++ b/tools/llvm-dwarfdump/llvm-dwarfdump.cpp
@@ -15,6 +15,7 @@
#include "llvm/ADT/Triple.h"
#include "llvm/ADT/STLExtras.h"
#include "llvm/Object/ObjectFile.h"
+#include "llvm/Object/RelocVisitor.h"
#include "llvm/DebugInfo/DIContext.h"
#include "llvm/Support/CommandLine.h"
#include "llvm/Support/Debug.h"
@@ -28,6 +29,9 @@
#include "llvm/Support/system_error.h"
#include <algorithm>
#include <cstring>
+#include <list>
+#include <string>
+
using namespace llvm;
using namespace object;
@@ -67,6 +71,7 @@ static void DumpInput(const StringRef &Filename) {
OwningPtr<ObjectFile> Obj(ObjectFile::createObjectFile(Buff.take()));
StringRef DebugInfoSection;
+ RelocAddrMap RelocMap;
StringRef DebugAbbrevSection;
StringRef DebugLineSection;
StringRef DebugArangesSection;
@@ -97,6 +102,57 @@ static void DumpInput(const StringRef &Filename) {
DebugStringSection = data;
else if (name == "debug_ranges")
DebugRangesSection = data;
+ // Any more debug info sections go here.
+ else
+ continue;
+
+ // TODO: For now only handle relocations for the debug_info section.
+ if (name != "debug_info")
+ continue;
+
+ if (i->begin_relocations() != i->end_relocations()) {
+ uint64_t SectionSize;
+ i->getSize(SectionSize);
+ for (relocation_iterator reloc_i = i->begin_relocations(),
+ reloc_e = i->end_relocations();
+ reloc_i != reloc_e; reloc_i.increment(ec)) {
+ uint64_t Address;
+ reloc_i->getAddress(Address);
+ uint64_t Type;
+ reloc_i->getType(Type);
+
+ RelocVisitor V(Obj->getFileFormatName());
+ // The section address is always 0 for debug sections.
+ RelocToApply R(V.visit(Type, *reloc_i));
+ if (V.error()) {
+ SmallString<32> Name;
+ error_code ec(reloc_i->getTypeName(Name));
+ if (ec) {
+ errs() << "Aaaaaa! Nameless relocation! Aaaaaa!\n";
+ }
+ errs() << "error: failed to compute relocation: "
+ << Name << "\n";
+ continue;
+ }
+
+ if (Address + R.Width > SectionSize) {
+ errs() << "error: " << R.Width << "-byte relocation starting "
+ << Address << " bytes into section " << name << " which is "
+ << SectionSize << " bytes long.\n";
+ continue;
+ }
+ if (R.Width > 8) {
+ errs() << "error: can't handle a relocation of more than 8 bytes at "
+ "a time.\n";
+ continue;
+ }
+ DEBUG(dbgs() << "Writing " << format("%p", R.Value)
+ << " at " << format("%p", Address)
+ << " with width " << format("%d", R.Width)
+ << "\n");
+ RelocMap[Address] = std::make_pair(R.Width, R.Value);
+ }
+ }
}
OwningPtr<DIContext> dictx(DIContext::getDWARFContext(/*FIXME*/true,
@@ -105,7 +161,8 @@ static void DumpInput(const StringRef &Filename) {
DebugArangesSection,
DebugLineSection,
DebugStringSection,
- DebugRangesSection));
+ DebugRangesSection,
+ RelocMap));
if (Address == -1ULL) {
outs() << Filename
<< ":\tfile format " << Obj->getFileFormatName() << "\n\n";