[clang] [llvm] [MC] Emit a jump table size section (PR #101962)
Saleem Abdulrasool via cfe-commits
cfe-commits at lists.llvm.org
Fri Aug 30 18:02:42 PDT 2024
================
@@ -2764,10 +2771,59 @@ void AsmPrinter::emitJumpTableInfo() {
for (const MachineBasicBlock *MBB : JTBBs)
emitJumpTableEntry(MJTI, MBB, JTI);
}
+
+ if (EmitJumpTableSizesSection)
+ emitJumpTableSizesSection(MJTI, F);
+
if (!JTInDiffSection)
OutStreamer->emitDataRegion(MCDR_DataRegionEnd);
}
+void AsmPrinter::emitJumpTableSizesSection(const MachineJumpTableInfo *MJTI,
+ const Function &F) const {
+ const std::vector<MachineJumpTableEntry> &JT = MJTI->getJumpTables();
+
+ if (JT.empty())
+ return;
+
+ StringRef GroupName = F.hasComdat() ? F.getComdat()->getName() : "";
+ MCSection *JumpTableSizesSection = nullptr;
+ StringRef sectionName = ".llvm_jump_table_sizes";
+
+ if (TM.getTargetTriple().isOSBinFormatELF()) {
+ MCSymbolELF *LinkedToSym = dyn_cast<MCSymbolELF>(CurrentFnSym);
+ int Flags = F.hasComdat() ? ELF::SHF_GROUP : 0;
+
+ JumpTableSizesSection = OutContext.getELFSection(
+ sectionName, ELF::SHT_LLVM_JT_SIZES, Flags, 0, GroupName, F.hasComdat(),
+ MCSection::NonUniqueID, LinkedToSym);
+ } else if (TM.getTargetTriple().isOSBinFormatCOFF()) {
+ if (F.hasComdat()) {
+ MCSymbolCOFF *LinkedToSym = dyn_cast<MCSymbolCOFF>(CurrentFnSym);
+
+ JumpTableSizesSection = OutContext.getCOFFSection(
+ sectionName,
+ COFF::IMAGE_SCN_CNT_INITIALIZED_DATA | COFF::IMAGE_SCN_MEM_READ |
+ COFF::IMAGE_SCN_LNK_COMDAT | COFF::IMAGE_SCN_MEM_DISCARDABLE,
+ F.getComdat()->getName(), COFF::IMAGE_COMDAT_SELECT_ASSOCIATIVE);
+ } else
----------------
compnerd wrote:
Braces here would be nice to match the other side.
https://github.com/llvm/llvm-project/pull/101962
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