[llvm-commits] CVS: llvm/lib/CodeGen/AsmPrinter.cpp

[Chris Lattner]

Changes in directory llvm/lib/CodeGen:

AsmPrinter.cpp updated: 1.98 -> 1.99
---
Log message:

Add support for targets that want to do something with the llvm.used list,
because they have an aggressive linker that does dead code stripping.


---
Diffs of the changes:  (+21 -2)

 AsmPrinter.cpp |   23 +++++++++++++++++++++--
 1 files changed, 21 insertions(+), 2 deletions(-)


Index: llvm/lib/CodeGen/AsmPrinter.cpp
diff -u llvm/lib/CodeGen/AsmPrinter.cpp:1.98 llvm/lib/CodeGen/AsmPrinter.cpp:1.99
--- llvm/lib/CodeGen/AsmPrinter.cpp:1.98	Sun Sep 24 14:44:59 2006
+++ llvm/lib/CodeGen/AsmPrinter.cpp	Mon Sep 25 22:38:18 2006
@@ -253,8 +253,11 @@
 
   assert(GV->hasInitializer() && "Not a special LLVM global!");
   
-  if (GV->getName() == "llvm.used")
-    return true;  // No need to emit this at all.
+  if (GV->getName() == "llvm.used") {
+    if (TAI->getUsedDirective() != 0)    // No need to emit this at all.
+      EmitLLVMUsedList(GV->getInitializer());
+    return true;
+  }
 
   if (GV->getName() == "llvm.global_ctors" && GV->use_empty()) {
     SwitchToDataSection(TAI->getStaticCtorsSection(), 0);
@@ -273,6 +276,22 @@
   return false;
 }
 
+/// EmitLLVMUsedList - For targets that define a TAI::UsedDirective, mark each
+/// global in the specified llvm.used list as being used with this directive.
+void AsmPrinter::EmitLLVMUsedList(Constant *List) {
+  const char *Directive = TAI->getUsedDirective();
+
+  // Should be an array of 'sbyte*'.
+  ConstantArray *InitList = dyn_cast<ConstantArray>(List);
+  if (InitList == 0) return;
+  
+  for (unsigned i = 0, e = InitList->getNumOperands(); i != e; ++i) {
+    O << Directive;
+    EmitConstantValueOnly(InitList->getOperand(i));
+    O << "\n";
+  }
+}
+
 /// EmitXXStructorList - Emit the ctor or dtor list.  This just prints out the 
 /// function pointers, ignoring the init priority.
 void AsmPrinter::EmitXXStructorList(Constant *List) {