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llvm-objdump: Do not attempt to disassemble symbols outside of section

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boundaries.

It is possible to create an ELF executable where symbol from say .text
section 'points' to the address outside the section boundaries. It does
not have a sense to disassemble something outside the section.

Without this fix llvm-objdump prints finite or infinite (depends on
the executable file architecture) number of 'invalid instruction
encoding' warnings.

llvm-svn: 202083
This commit is contained in:
Simon Atanasyan
2014-02-24 22:12:11 +00:00
parent 6a162d850b
commit 2b614e1163
4 changed files with 34 additions and 3 deletions
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9
llvm/tools/llvm-objdump/llvm-objdump.cpp
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@@ -405,6 +405,10 @@ static void DisassembleObject(const ObjectFile *Obj, bool InlineRelocs) {
if (error(I->getAddress(SectionAddr)))
break;
uint64_t SectSize;
if (error(I->getSize(SectSize)))
break;
// Make a list of all the symbols in this section.
std::vector<std::pair<uint64_t, StringRef> > Symbols;
for (symbol_iterator SI = Obj->symbol_begin(), SE = Obj->symbol_end();
@@ -417,6 +421,8 @@ static void DisassembleObject(const ObjectFile *Obj, bool InlineRelocs) {
if (Address == UnknownAddressOrSize)
continue;
Address -= SectionAddr;
if (Address >= SectSize)
continue;
StringRef Name;
if (error(SI->getName(Name)))
@@ -473,9 +479,6 @@ static void DisassembleObject(const ObjectFile *Obj, bool InlineRelocs) {
StringRefMemoryObject memoryObject(Bytes, SectionAddr);
uint64_t Size;
uint64_t Index;
uint64_t SectSize;
if (error(I->getSize(SectSize)))
break;
std::vector<RelocationRef>::const_iterator rel_cur = Rels.begin();
std::vector<RelocationRef>::const_iterator rel_end = Rels.end();