[PATCH] D49374: [LLF][ELF] - Support -z global

[George Rimar via Phabricator via llvm-commits]

grimar updated this revision to Diff 159168.
grimar retitled this revision from "[ELF] - Support -z global" to "[LLF][ELF] - Support -z global".
grimar added a comment.

- Documented the new option.


https://reviews.llvm.org/D49374

Files:
  ELF/Config.h
  ELF/Driver.cpp
  ELF/SyntheticSections.cpp
  docs/ld.lld.1
  test/ELF/dt_flags.s


Index: test/ELF/dt_flags.s
===================================================================
--- test/ELF/dt_flags.s
+++ test/ELF/dt_flags.s
@@ -3,7 +3,8 @@
 # RUN: llvm-mc -filetype=obj -triple=x86_64-unknown-linux %s -o %t
 # RUN: ld.lld -shared %t -o %t.so
 
-# RUN: ld.lld -z initfirst -z now -z nodelete -z nodlopen -z origin -Bsymbolic %t %t.so -o %t1
+# RUN: ld.lld -z global -z initfirst -z now -z nodelete -z nodlopen -z origin \
+# RUN:   -Bsymbolic %t %t.so -o %t1
 # RUN: llvm-readobj -dynamic-table %t1 | FileCheck -check-prefix=FLAGS %s
 
 # RUN: ld.lld %t %t.so -o %t2
@@ -14,7 +15,7 @@
 
 # FLAGS: DynamicSection [
 # FLAGS:   0x000000000000001E FLAGS ORIGIN SYMBOLIC BIND_NOW
-# FLAGS:   0x000000006FFFFFFB FLAGS_1 NOW NODELETE INITFIRST NOOPEN ORIGIN
+# FLAGS:   0x000000006FFFFFFB FLAGS_1 NOW GLOBAL NODELETE INITFIRST NOOPEN ORIGIN
 # FLAGS: ]
 
 # CHECK: DynamicSection [
Index: docs/ld.lld.1
===================================================================
--- docs/ld.lld.1
+++ docs/ld.lld.1
@@ -440,6 +440,12 @@
 Stack permissions are recorded in the
 .Dv PT_GNU_STACK
 segment.
+.It Cm global
+Sets the
+.Dv DF_1_GLOBAL flag in the
+.Dv DYNAMIC
+section.
+Different loaders can decide how to handle this flag on their own.
 .It Cm initfirst
 Sets the
 .Dv DF_1_INITFIRST
Index: ELF/SyntheticSections.cpp
===================================================================
--- ELF/SyntheticSections.cpp
+++ ELF/SyntheticSections.cpp
@@ -1264,6 +1264,8 @@
   uint32_t DtFlags1 = 0;
   if (Config->Bsymbolic)
     DtFlags |= DF_SYMBOLIC;
+  if (Config->ZGlobal)
+    DtFlags1 |= DF_1_GLOBAL;
   if (Config->ZInitfirst)
     DtFlags1 |= DF_1_INITFIRST;
   if (Config->ZNodelete)
Index: ELF/Driver.cpp
===================================================================
--- ELF/Driver.cpp
+++ ELF/Driver.cpp
@@ -338,10 +338,10 @@
 
 static bool isKnown(StringRef S) {
   return S == "combreloc" || S == "copyreloc" || S == "defs" ||
-         S == "execstack" || S == "hazardplt" || S == "initfirst" ||
-         S == "keep-text-section-prefix" || S == "lazy" || S == "muldefs" ||
-         S == "nocombreloc" || S == "nocopyreloc" || S == "nodelete" ||
-         S == "nodlopen" || S == "noexecstack" ||
+         S == "execstack" || S == "global" || S == "hazardplt" ||
+         S == "initfirst" || S == "keep-text-section-prefix" || S == "lazy" ||
+         S == "muldefs" || S == "nocombreloc" || S == "nocopyreloc" ||
+         S == "nodelete" || S == "nodlopen" || S == "noexecstack" ||
          S == "nokeep-text-section-prefix" || S == "norelro" || S == "notext" ||
          S == "now" || S == "origin" || S == "relro" || S == "retpolineplt" ||
          S == "rodynamic" || S == "text" || S == "wxneeded" ||
@@ -834,6 +834,7 @@
   Config->ZCombreloc = getZFlag(Args, "combreloc", "nocombreloc", true);
   Config->ZCopyreloc = getZFlag(Args, "copyreloc", "nocopyreloc", true);
   Config->ZExecstack = getZFlag(Args, "execstack", "noexecstack", false);
+  Config->ZGlobal = hasZOption(Args, "global");
   Config->ZHazardplt = hasZOption(Args, "hazardplt");
   Config->ZInitfirst = hasZOption(Args, "initfirst");
   Config->ZKeepTextSectionPrefix = getZFlag(
Index: ELF/Config.h
===================================================================
--- ELF/Config.h
+++ ELF/Config.h
@@ -180,6 +180,7 @@
   bool ZCombreloc;
   bool ZCopyreloc;
   bool ZExecstack;
+  bool ZGlobal;
   bool ZHazardplt;
   bool ZInitfirst;
   bool ZKeepTextSectionPrefix;


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