From c528858cbd4fef01f2007cea8a4e8e25a6b86443 Mon Sep 17 00:00:00 2001
From: Eric Christopher <echristo@gmail.com>
Date: Fri, 24 Jan 2014 11:40:29 +0000
Subject: Use DW_AT_high_pc and DW_AT_low_pc for the high and low pc for a
 compile unit. Make these relocations on the platforms that need relocations
 and add a routine to ensure that we don't put the addresses in an offset
 table for split dwarf.

llvm-svn: 199990
---
 llvm/lib/CodeGen/AsmPrinter/DwarfDebug.cpp | 16 +++++++++++++---
 1 file changed, 13 insertions(+), 3 deletions(-)

(limited to 'llvm/lib/CodeGen/AsmPrinter/DwarfDebug.cpp')

diff --git a/llvm/lib/CodeGen/AsmPrinter/DwarfDebug.cpp b/llvm/lib/CodeGen/AsmPrinter/DwarfDebug.cpp
index 7ba4fece43b..077af8c3756 100644
--- a/llvm/lib/CodeGen/AsmPrinter/DwarfDebug.cpp
+++ b/llvm/lib/CodeGen/AsmPrinter/DwarfDebug.cpp
@@ -187,6 +187,7 @@ DwarfDebug::DwarfDebug(AsmPrinter *A, Module *M)
   DwarfAddrSectionSym = 0;
   DwarfAbbrevDWOSectionSym = DwarfStrDWOSectionSym = 0;
   FunctionBeginSym = FunctionEndSym = 0;
+  TextSectionBeginSym = TextSectionEndSym = 0;
   CurFn = 0;
   CurMI = 0;
 
@@ -1061,9 +1062,12 @@ void DwarfDebug::finalizeModuleInfo() {
         addSectionLabel(Asm, U, U->getUnitDie(), dwarf::DW_AT_ranges,
                         Asm->GetTempSymbol("cu_ranges", U->getUniqueID()),
                         DwarfDebugRangeSectionSym);
-      else
-        U->addUInt(U->getUnitDie(), dwarf::DW_AT_low_pc, dwarf::DW_FORM_addr,
-                   0);
+      else {
+        U->addLocalLabelAddress(U->getUnitDie(), dwarf::DW_AT_low_pc,
+                                TextSectionBeginSym);
+        U->addLocalLabelAddress(U->getUnitDie(), dwarf::DW_AT_high_pc,
+                                TextSectionEndSym);
+      }
     }
   }
 
@@ -1117,6 +1121,10 @@ void DwarfDebug::endSections() {
       Sym = Asm->GetTempSymbol("debug_end", ID);
       Asm->OutStreamer.SwitchSection(Section);
       Asm->OutStreamer.EmitLabel(Sym);
+      // If this is the end of the text section keep track of where the end of
+      // the section is so that we can use it later.
+      if (Section == Asm->getObjFileLowering().getTextSection())
+        TextSectionEndSym = Sym;
     }
 
     // Insert a final terminator.
@@ -2012,6 +2020,8 @@ void DwarfDebug::emitSectionLabels() {
 
   DwarfDebugLocSectionSym =
       emitSectionSym(Asm, TLOF.getDwarfLocSection(), "section_debug_loc");
+
+  TextSectionBeginSym = emitSectionSym(Asm, TLOF.getTextSection(), "text_begin");
 }
 
 // Recursively emits a debug information entry.
-- 
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