Object/Archive: Add symbol table iteration.
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@143561 91177308-0d34-0410-b5e6-96231b3b80d8
diff --git a/lib/Object/Archive.cpp b/lib/Object/Archive.cpp
index f1c4b2d..968ddcd 100644
--- a/lib/Object/Archive.cpp
+++ b/lib/Object/Archive.cpp
@@ -13,6 +13,7 @@
#include "llvm/Object/Archive.h"
#include "llvm/ADT/APInt.h"
+#include "llvm/Support/Endian.h"
#include "llvm/Support/MemoryBuffer.h"
using namespace llvm;
@@ -171,8 +172,7 @@
}
Archive::Archive(MemoryBuffer *source, error_code &ec)
- : Binary(Binary::isArchive, source)
- , StringTable(Child(this, StringRef(0, 0))) {
+ : Binary(Binary::isArchive, source) {
// Check for sufficient magic.
if (!source || source->getBufferSize()
< (8 + sizeof(ArchiveMemberHeader) + 2) // Smallest archive.
@@ -181,15 +181,18 @@
return;
}
- // Get the string table. It's the 3rd member.
- child_iterator StrTable = begin_children(false);
+ // Get the special members.
+ child_iterator i = begin_children(false);
child_iterator e = end_children();
- for (int i = 0; StrTable != e && i < 2; ++StrTable, ++i) {}
- // Check to see if there were 3 members, or the 3rd member wasn't named "//".
- StringRef name;
- if (StrTable != e && !StrTable->getName(name) && name == "//")
- StringTable = StrTable;
+ if (i != e) ++i; // Nobody cares about the first member.
+ if (i != e) {
+ SymbolTable = i;
+ ++i;
+ }
+ if (i != e) {
+ StringTable = i;
+ }
ec = object_error::success;
}
@@ -208,3 +211,62 @@
Archive::child_iterator Archive::end_children() const {
return Child(this, StringRef(0, 0));
}
+
+error_code Archive::Symbol::getName(StringRef &Result) const {
+ Result =
+ StringRef(Parent->SymbolTable->getBuffer()->getBufferStart() + StringIndex);
+ return object_error::success;
+}
+
+error_code Archive::Symbol::getMember(child_iterator &Result) const {
+ const char *buf = Parent->SymbolTable->getBuffer()->getBufferStart();
+ uint32_t member_count = *reinterpret_cast<const support::ulittle32_t*>(buf);
+ const char *offsets = buf + 4;
+ buf += 4 + (member_count * 4); // Skip offsets.
+ uint32_t symbol_count = *reinterpret_cast<const support::ulittle32_t*>(buf);
+ const char *indicies = buf + 4;
+
+ uint16_t offsetindex =
+ *(reinterpret_cast<const support::ulittle16_t*>(indicies)
+ + SymbolIndex);
+
+ uint32_t offset = *(reinterpret_cast<const support::ulittle32_t*>(offsets)
+ + (offsetindex - 1));
+
+ const char *Loc = Parent->getData().begin() + offset;
+ size_t Size = sizeof(ArchiveMemberHeader) +
+ ToHeader(Loc)->getSize();
+ Result = Child(Parent, StringRef(Loc, Size));
+
+ return object_error::success;
+}
+
+Archive::Symbol Archive::Symbol::getNext() const {
+ Symbol t(*this);
+ const char *buf = Parent->SymbolTable->getBuffer()->getBufferStart();
+ buf += t.StringIndex;
+ while (*buf++); // Go to one past next null.
+ t.StringIndex = buf - Parent->SymbolTable->getBuffer()->getBufferStart();
+ ++t.SymbolIndex;
+ return t;
+}
+
+Archive::symbol_iterator Archive::begin_symbols() const {
+ const char *buf = SymbolTable->getBuffer()->getBufferStart();
+ uint32_t member_count = *reinterpret_cast<const support::ulittle32_t*>(buf);
+ buf += 4 + (member_count * 4); // Skip offsets.
+ uint32_t symbol_count = *reinterpret_cast<const support::ulittle32_t*>(buf);
+ buf += 4 + (symbol_count * 2); // Skip indices.
+ uint32_t string_start_offset =
+ buf - SymbolTable->getBuffer()->getBufferStart();
+ return symbol_iterator(Symbol(this, 0, string_start_offset));
+}
+
+Archive::symbol_iterator Archive::end_symbols() const {
+ const char *buf = SymbolTable->getBuffer()->getBufferStart();
+ uint32_t member_count = *reinterpret_cast<const support::ulittle32_t*>(buf);
+ buf += 4 + (member_count * 4); // Skip offsets.
+ uint32_t symbol_count = *reinterpret_cast<const support::ulittle32_t*>(buf);
+ return symbol_iterator(
+ Symbol(this, symbol_count, 0));
+}