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Object/Archive: Add BSD style long file name support and skip internal members.

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git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@142981 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Michael J. Spencer 2011-10-25 22:30:42 +00:00
parent c8aa726ec2
commit aaf98ead11
2 changed files with 49 additions and 8 deletions
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2
include/llvm/Object/Archive.h
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@ -71,7 +71,7 @@ public:
Archive(MemoryBuffer *source, error_code &ec);
child_iterator begin_children() const;
child_iterator begin_children(bool skip_internal = true) const;
child_iterator end_children() const;
// Cast methods.

55
lib/Object/Archive.cpp
View File

@ -32,7 +32,11 @@ struct ArchiveMemberHeader {
///! Get the name without looking up long names.
StringRef getName() const {
char EndCond = Name[0] == '/' ? ' ' : '/';
char EndCond;
if (Name[0] == '/' || Name[0] == '#')
EndCond = ' ';
else
EndCond = '/';
StringRef::size_type end = StringRef(Name, sizeof(Name)).find(EndCond);
if (end == StringRef::npos)
end = sizeof(Name);
@ -53,6 +57,21 @@ const ArchiveMemberHeader *ToHeader(const char *base) {
}
}
static bool isInternalMember(const ArchiveMemberHeader &amh) {
const char *internals[] = {
"/",
"//",
"#_LLVM_SYM_TAB_#"
};
StringRef name = amh.getName();
for (std::size_t i = 0; i < sizeof(internals) / sizeof(*internals); ++i) {
if (name == internals[i])
return true;
}
return false;
}
Archive::Child Archive::Child::getNext() const {
size_t SpaceToSkip = sizeof(ArchiveMemberHeader) +
ToHeader(Data.data())->getSize();
@ -101,6 +120,11 @@ error_code Archive::Child::getName(StringRef &Result) const {
return object_error::parse_failed;
Result = addr;
return object_error::success;
} else if (name.startswith("#1/")) {
APInt name_size;
name.substr(3).getAsInteger(10, name_size);
Result = Data.substr(0, name_size.getZExtValue());
return object_error::success;
}
// It's a simple name.
if (name[name.size() - 1] == '/')
@ -111,14 +135,27 @@ error_code Archive::Child::getName(StringRef &Result) const {
}
uint64_t Archive::Child::getSize() const {
return ToHeader(Data.data())->getSize();
uint64_t size = ToHeader(Data.data())->getSize();
// Don't include attached name.
StringRef name = ToHeader(Data.data())->getName();
if (name.startswith("#1/")) {
APInt name_size;
name.substr(3).getAsInteger(10, name_size);
size -= name_size.getZExtValue();
}
return size;
}
MemoryBuffer *Archive::Child::getBuffer() const {
StringRef name;
if (getName(name)) return NULL;
return MemoryBuffer::getMemBuffer(Data.substr(sizeof(ArchiveMemberHeader),
getSize()),
int size = sizeof(ArchiveMemberHeader);
if (name.startswith("#1/")) {
APInt name_size;
name.substr(3).getAsInteger(10, name_size);
size += name_size.getZExtValue();
}
return MemoryBuffer::getMemBuffer(Data.substr(size, getSize()),
name,
false);
}
@ -144,7 +181,7 @@ Archive::Archive(MemoryBuffer *source, error_code &ec)
}
// Get the string table. It's the 3rd member.
child_iterator StrTable = begin_children();
child_iterator StrTable = begin_children(false);
child_iterator e = end_children();
for (int i = 0; StrTable != e && i < 2; ++StrTable, ++i) {}
@ -156,11 +193,15 @@ Archive::Archive(MemoryBuffer *source, error_code &ec)
ec = object_error::success;
}
Archive::child_iterator Archive::begin_children() const {
Archive::child_iterator Archive::begin_children(bool skip_internal) const {
const char *Loc = Data->getBufferStart() + Magic.size();
size_t Size = sizeof(ArchiveMemberHeader) +
ToHeader(Loc)->getSize();
return Child(this, StringRef(Loc, Size));
Child c(this, StringRef(Loc, Size));
// Skip internals at the beginning of an archive.
if (skip_internal && isInternalMember(*ToHeader(Loc)))
return c.getNext();
return c;
}
Archive::child_iterator Archive::end_children() const {