add new JumpTableSpecialLabelPrefix hook to asmprinter for jumptable emission.
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@33314 91177308-0d34-0410-b5e6-96231b3b80d8
diff --git a/lib/CodeGen/AsmPrinter.cpp b/lib/CodeGen/AsmPrinter.cpp
index caa9da0..a9e7201 100644
--- a/lib/CodeGen/AsmPrinter.cpp
+++ b/lib/CodeGen/AsmPrinter.cpp
@@ -244,6 +244,13 @@
if (EmittedSets.insert(JTBBs[ii]).second)
printSetLabel(i, JTBBs[ii]);
+ // On some targets (e.g. darwin) we want to emit two consequtive labels
+ // before each jump table. The first label is never referenced, but tells
+ // the assembler and linker the extents of the jump table object. The
+ // second label is actually referenced by the code.
+ if (const char *JTLabelPrefix = TAI->getJumpTableSpecialLabelPrefix())
+ O << JTLabelPrefix << "JTI" << getFunctionNumber() << '_' << i << ":\n";
+
O << TAI->getPrivateGlobalPrefix() << "JTI" << getFunctionNumber()
<< '_' << i << ":\n";
@@ -259,7 +266,8 @@
<< '_' << i << "_set_" << JTBBs[ii]->getNumber();
} else if (IsPic) {
printBasicBlockLabel(JTBBs[ii], false, false);
- //If the arch uses custom Jump Table directives, don't calc relative to JT
+ // If the arch uses custom Jump Table directives, don't calc relative to
+ // JT
if (!HadJTEntryDirective)
O << '-' << TAI->getPrivateGlobalPrefix() << "JTI"
<< getFunctionNumber() << '_' << i;
diff --git a/lib/Target/TargetAsmInfo.cpp b/lib/Target/TargetAsmInfo.cpp
index 3afbddb..45ea0ee 100644
--- a/lib/Target/TargetAsmInfo.cpp
+++ b/lib/Target/TargetAsmInfo.cpp
@@ -28,6 +28,7 @@
CommentString("#"),
GlobalPrefix(""),
PrivateGlobalPrefix("."),
+ JumpTableSpecialLabelPrefix(0),
GlobalVarAddrPrefix(""),
GlobalVarAddrSuffix(""),
FunctionAddrPrefix(""),