[AIX] Lowering jump table, constant pool and block address in asm

This patch lowering jump table, constant pool and block address in assembly.
1. On AIX, jump table index is always relative;
2. Put CPI and JTI into ReadOnlySection until we support unique data sections;
3. Create the temp symbol for block address symbol;
4. Update MIR testcases and add related assembly part;

Differential Revision: https://reviews.llvm.org/D70243

1 files changed, 12 insertions, 1 deletions

diff --git a/llvm/lib/CodeGen/MachineModuleInfo.cpp b/llvm/lib/CodeGen/MachineModuleInfo.cpp
index 48a72c8..0094a92 100644
--- a/llvm/lib/CodeGen/MachineModuleInfo.cpp
+++ b/llvm/lib/CodeGen/MachineModuleInfo.cpp
@@ -23,6 +23,7 @@
 #include "llvm/InitializePasses.h"
 #include "llvm/MC/MCContext.h"
 #include "llvm/MC/MCSymbol.h"
+#include "llvm/MC/MCSymbolXCOFF.h"
 #include "llvm/Pass.h"
 #include "llvm/Support/Casting.h"
 #include "llvm/Support/ErrorHandling.h"
@@ -117,7 +118,17 @@ ArrayRef<MCSymbol *> MMIAddrLabelMap::getAddrLabelSymbolToEmit(BasicBlock *BB) {
   BBCallbacks.back().setMap(this);
   Entry.Index = BBCallbacks.size() - 1;
   Entry.Fn = BB->getParent();
-  Entry.Symbols.push_back(Context.createTempSymbol(!BB->hasAddressTaken()));
+  MCSymbol *Sym = Context.createTempSymbol(!BB->hasAddressTaken());
+  if (Context.getObjectFileInfo()->getTargetTriple().isOSBinFormatXCOFF()) {
+    MCSymbol *FnEntryPointSym =
+        Context.lookupSymbol("." + Entry.Fn->getName());
+    assert(FnEntryPointSym && "The function entry pointer symbol should have"
+		              " already been initialized.");
+    MCSectionXCOFF *Csect =
+        cast<MCSymbolXCOFF>(FnEntryPointSym)->getContainingCsect();
+    cast<MCSymbolXCOFF>(Sym)->setContainingCsect(Csect);
+  }
+  Entry.Symbols.push_back(Sym);
   return Entry.Symbols;
 }