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Object: Fix type punned pointer issues by making DataRefImpl a union and using intptr_t.

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git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@123962 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Michael J. Spencer
2011-01-21 02:27:02 +00:00
parent be111ef182
commit 7acdb4d237
3 changed files with 82 additions and 84 deletions
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51
lib/Object/COFFObjectFile.cpp
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@@ -128,13 +128,14 @@ public:
} // end namespace
SymbolRef COFFObjectFile::getSymbolNext(DataRefImpl Symb) const {
const coff_symbol *symb = *reinterpret_cast<const coff_symbol**>(&Symb);
const coff_symbol *symb = reinterpret_cast<const coff_symbol*>(Symb.p);
symb += 1 + symb->NumberOfAuxSymbols;
return SymbolRef(DataRefImpl(symb), this);
Symb.p = reinterpret_cast<intptr_t>(symb);
return SymbolRef(Symb, this);
}
StringRef COFFObjectFile::getSymbolName(DataRefImpl Symb) const {
const coff_symbol *symb = *reinterpret_cast<const coff_symbol**>(&Symb);
const coff_symbol *symb = reinterpret_cast<const coff_symbol*>(Symb.p);
// Check for string table entry. First 4 bytes are 0.
if (symb->Name.Offset.Zeroes == 0) {
uint32_t Offset = symb->Name.Offset.Offset;
@@ -149,7 +150,7 @@ StringRef COFFObjectFile::getSymbolName(DataRefImpl Symb) const {
}
uint64_t COFFObjectFile::getSymbolAddress(DataRefImpl Symb) const {
const coff_symbol *symb = *reinterpret_cast<const coff_symbol**>(&Symb);
const coff_symbol *symb = reinterpret_cast<const coff_symbol*>(Symb.p);
const coff_section *Section = getSection(symb->SectionNumber);
char Type = getSymbolNMTypeChar(Symb);
if (Type == 'U' || Type == 'w')
@@ -163,7 +164,7 @@ uint64_t COFFObjectFile::getSymbolSize(DataRefImpl Symb) const {
// FIXME: Return the correct size. This requires looking at all the symbols
// in the same section as this symbol, and looking for either the next
// symbol, or the end of the section.
const coff_symbol *symb = *reinterpret_cast<const coff_symbol**>(&Symb);
const coff_symbol *symb = reinterpret_cast<const coff_symbol*>(Symb.p);
const coff_section *Section = getSection(symb->SectionNumber);
char Type = getSymbolNMTypeChar(Symb);
if (Type == 'U' || Type == 'w')
@@ -174,7 +175,7 @@ uint64_t COFFObjectFile::getSymbolSize(DataRefImpl Symb) const {
}
char COFFObjectFile::getSymbolNMTypeChar(DataRefImpl Symb) const {
const coff_symbol *symb = *reinterpret_cast<const coff_symbol**>(&Symb);
const coff_symbol *symb = reinterpret_cast<const coff_symbol*>(Symb.p);
char ret = StringSwitch<char>(getSymbolName(Symb))
.StartsWith(".debug", 'N')
.StartsWith(".sxdata", 'N')
@@ -236,13 +237,14 @@ bool COFFObjectFile::isSymbolInternal(DataRefImpl Symb) const {
}
SectionRef COFFObjectFile::getSectionNext(DataRefImpl Sec) const {
const coff_section *sec = *reinterpret_cast<const coff_section**>(&Sec);
const coff_section *sec = reinterpret_cast<const coff_section*>(Sec.p);
sec += 1;
return SectionRef(DataRefImpl(sec), this);
Sec.p = reinterpret_cast<intptr_t>(sec);
return SectionRef(Sec, this);
}
StringRef COFFObjectFile::getSectionName(DataRefImpl Sec) const {
const coff_section *sec = *reinterpret_cast<const coff_section**>(&Sec);
const coff_section *sec = reinterpret_cast<const coff_section*>(Sec.p);
StringRef name;
if (sec->Name[7] == 0)
// Null terminated, let ::strlen figure out the length.
@@ -263,23 +265,23 @@ StringRef COFFObjectFile::getSectionName(DataRefImpl Sec) const {
}
uint64_t COFFObjectFile::getSectionAddress(DataRefImpl Sec) const {
const coff_section *sec = *reinterpret_cast<const coff_section**>(&Sec);
const coff_section *sec = reinterpret_cast<const coff_section*>(Sec.p);
return sec->VirtualAddress;
}
uint64_t COFFObjectFile::getSectionSize(DataRefImpl Sec) const {
const coff_section *sec = *reinterpret_cast<const coff_section**>(&Sec);
const coff_section *sec = reinterpret_cast<const coff_section*>(Sec.p);
return sec->SizeOfRawData;
}
StringRef COFFObjectFile::getSectionContents(DataRefImpl Sec) const {
const coff_section *sec = *reinterpret_cast<const coff_section**>(&Sec);
const coff_section *sec = reinterpret_cast<const coff_section*>(Sec.p);
return StringRef(reinterpret_cast<const char *>(base + sec->PointerToRawData),
sec->SizeOfRawData);
}
bool COFFObjectFile::isSectionText(DataRefImpl Sec) const {
const coff_section *sec = *reinterpret_cast<const coff_section**>(&Sec);
const coff_section *sec = reinterpret_cast<const coff_section*>(Sec.p);
return sec->Characteristics & COFF::IMAGE_SCN_CNT_CODE;
}
@@ -300,29 +302,32 @@ COFFObjectFile::COFFObjectFile(MemoryBuffer *Object)
}
ObjectFile::symbol_iterator COFFObjectFile::begin_symbols() const {
return symbol_iterator(
SymbolRef(DataRefImpl(SymbolTable), this));
DataRefImpl ret;
ret.p = reinterpret_cast<intptr_t>(SymbolTable);
return symbol_iterator(SymbolRef(ret, this));
}
ObjectFile::symbol_iterator COFFObjectFile::end_symbols() const {
// The symbol table ends where the string table begins.
return symbol_iterator(
SymbolRef(DataRefImpl(StringTable), this));
DataRefImpl ret;
ret.p = reinterpret_cast<intptr_t>(StringTable);
return symbol_iterator(SymbolRef(ret, this));
}
ObjectFile::section_iterator COFFObjectFile::begin_sections() const {
return section_iterator(
SectionRef(DataRefImpl(SectionTable), this));
DataRefImpl ret;
ret.p = reinterpret_cast<intptr_t>(SectionTable);
return section_iterator(SectionRef(ret, this));
}
ObjectFile::section_iterator COFFObjectFile::end_sections() const {
return section_iterator(
SectionRef(
DataRefImpl((void *)(SectionTable + Header->NumberOfSections)), this));
DataRefImpl ret;
ret.p = reinterpret_cast<intptr_t>(SectionTable + Header->NumberOfSections);
return section_iterator(SectionRef(ret, this));
}
uint8_t COFFObjectFile::getBytesInAddress() const {
return 4;
return getArch() == Triple::x86_64 ? 8 : 4;
}
StringRef COFFObjectFile::getFileFormatName() const {