================
@@ -983,6 +995,44 @@ llvm::Error
ProcessElfCore::ParseThreadContextsFromNoteSegment(
}
}
+bool ProcessElfCore::IsElf(const NT_FILE_Entry entry) {
+ const uint8_t elf_header[4] = {0x7f, 0x45, 0x4c,
+ 0x46}; // ELF file begin with this 4 bytes
+ uint8_t buf[4];
+ Status error;
+ size_t byte_read = ReadMemory(entry.start, buf, 4, error);
+ if (byte_read == 4) {
+ return memcmp(elf_header, buf, 4) == 0;
+ } else {
+ return false;
+ }
+}
+
+UUID ProcessElfCore::FindBuildId(const NT_FILE_Entry entry) {
+ if (!IsElf(entry)) {
+ return UUID();
+ }
+ // Build ID is stored in the ELF file as a section named ".note.gnu.build-id"
+ uint8_t gnu_build_id_bytes[8] = {0x03, 0x00, 0x00, 0x00,
+ 0x47, 0x4e, 0x55, 0x00};
+ lldb::addr_t gnu_build_id_addr =
+ FastSearch(entry.start, entry.end, gnu_build_id_bytes, 8);
+ if (gnu_build_id_addr == LLDB_INVALID_ADDRESS) {
+ return UUID();
+ }
+ uint8_t buf[36];
+ Status error;
+ size_t byte_read = ReadMemory(gnu_build_id_addr - 8, buf, 36, error);
+ // .note.gnu.build-id starts with 04 00 00 00 {id_byte_size} 00 00 00 03 00
00
+ // 00 47 4e 55 00
+ if (byte_read == 36) {
+ if (buf[0] == 0x04) {
+ return UUID(llvm::ArrayRef<uint8_t>(buf + 16, buf[4] /*byte size*/));
+ }
+ }
----------------
clayborg wrote:
remove braces per llvm coding guidelines for single statement `if`
https://github.com/llvm/llvm-project/pull/92078
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