--- /dev/null
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}
}
-static uint32_t calculateAlignment(const MachOObjectFile *ObjectFile) {
- // TODO: Implement getAlign() and remove hard coding
- // Will be implemented in a follow-up.
+// For compatibility with cctools lipo, alignment is calculated as the minimum
+// aligment of all segments. Each segments's alignment is the maximum alignment
+// from its sections
+static uint32_t calculateSegmentAlignment(const MachOObjectFile &O) {
+ uint32_t P2CurrentAlignment;
+ uint32_t P2MinAlignment = MachOUniversalBinary::MaxSectionAlignment;
+ const bool Is64Bit = O.is64Bit();
+
+ for (const auto &LC : O.load_commands()) {
+ if (LC.C.cmd != (Is64Bit ? MachO::LC_SEGMENT_64 : MachO::LC_SEGMENT))
+ continue;
+ if (O.getHeader().filetype == MachO::MH_OBJECT) {
+ unsigned NumberOfSections =
+ (Is64Bit ? O.getSegment64LoadCommand(LC).nsects
+ : O.getSegmentLoadCommand(LC).nsects);
+ P2CurrentAlignment = NumberOfSections ? 2 : P2MinAlignment;
+ for (unsigned SI = 0; SI < NumberOfSections; ++SI) {
+ P2CurrentAlignment = std::max(P2CurrentAlignment,
+ (Is64Bit ? O.getSection64(LC, SI).align
+ : O.getSection(LC, SI).align));
+ }
+ } else {
+ P2CurrentAlignment =
+ countTrailingZeros(Is64Bit ? O.getSegment64LoadCommand(LC).vmaddr
+ : O.getSegmentLoadCommand(LC).vmaddr);
+ }
+ P2MinAlignment = std::min(P2MinAlignment, P2CurrentAlignment);
+ }
+ // return a value >= 4 byte aligned, and less than MachO MaxSectionAlignment
+ return std::max(
+ static_cast<uint32_t>(2),
+ std::min(P2MinAlignment, static_cast<uint32_t>(
+ MachOUniversalBinary::MaxSectionAlignment)));
+}
+static uint32_t calculateAlignment(const MachOObjectFile *ObjectFile) {
switch (ObjectFile->getHeader().cputype) {
case MachO::CPU_TYPE_I386:
case MachO::CPU_TYPE_X86_64:
case MachO::CPU_TYPE_ARM64_32:
return 14; // log2 value of page size(16k) for Darwin ARM
default:
- return 12;
+ return calculateSegmentAlignment(*ObjectFile);
}
}