[llvm-commits] [llvm] r83127 - /llvm/trunk/lib/Target/ARM/AsmPrinter/ARMAsmPrinter.cpp

[Bob Wilson]

Author: bwilson
Date: Tue Sep 29 19:23:42 2009
New Revision: 83127

URL: http://llvm.org/viewvc/llvm-project?rev=83127&view=rev
Log:
For Darwin, emit all the text section directives together before the dwarf
section directives.  This causes the assembler to put the text sections at
the beginning of the object file, which helps work around a limitation of the
Darwin ARM relocations.  Radar 7255355.

Modified:
    llvm/trunk/lib/Target/ARM/AsmPrinter/ARMAsmPrinter.cpp

Modified: llvm/trunk/lib/Target/ARM/AsmPrinter/ARMAsmPrinter.cpp
URL: http://llvm.org/viewvc/llvm-project/llvm/trunk/lib/Target/ARM/AsmPrinter/ARMAsmPrinter.cpp?rev=83127&r1=83126&r2=83127&view=diff

==============================================================================
--- llvm/trunk/lib/Target/ARM/AsmPrinter/ARMAsmPrinter.cpp (original)
+++ llvm/trunk/lib/Target/ARM/AsmPrinter/ARMAsmPrinter.cpp Tue Sep 29 19:23:42 2009
@@ -1046,6 +1046,25 @@
 
 bool ARMAsmPrinter::doInitialization(Module &M) {
 
+  if (Subtarget->isTargetDarwin()) {
+    Reloc::Model RelocM = TM.getRelocationModel();
+    if (RelocM == Reloc::PIC_ || RelocM == Reloc::DynamicNoPIC) {
+      // Declare all the text sections up front (before the DWARF sections
+      // emitted by AsmPrinter::doInitialization) so the assembler will keep
+      // them together at the beginning of the object file.  This helps
+      // avoid out-of-range branches that are due a fundamental limitation of
+      // the way symbol offsets are encoded with the current Darwin ARM
+      // relocations.
+      O << "\t.section __TEXT,__text,regular\n"
+        << "\t.section __TEXT,__textcoal_nt,coalesced\n"
+        << "\t.section __TEXT,__const_coal,coalesced\n";
+      if (RelocM == Reloc::DynamicNoPIC)
+        O << "\t.section __TEXT,__symbol_stub4,symbol_stubs,none,12\n";
+      else
+        O << "\t.section __TEXT,__picsymbolstub4,symbol_stubs,none,16\n";
+    }
+  }
+
   bool Result = AsmPrinter::doInitialization(M);
   DW = getAnalysisIfAvailable<DwarfWriter>();