From: Evan Cheng <evan.cheng@apple.com>
Date: Thu, 10 Sep 2009 01:23:53 +0000 (+0000)
Subject: Proper support of non-lazy indirect symbols.
X-Git-Url: http://demsky.eecs.uci.edu/git/?a=commitdiff_plain;h=08669746d04468898b094908484946216628d359;p=oota-llvm.git

Proper support of non-lazy indirect symbols.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@81422 91177308-0d34-0410-b5e6-96231b3b80d8
---

diff --git a/lib/Target/ARM/ARMCodeEmitter.cpp b/lib/Target/ARM/ARMCodeEmitter.cpp
index d6092fa127f..6275f516697 100644
--- a/lib/Target/ARM/ARMCodeEmitter.cpp
+++ b/lib/Target/ARM/ARMCodeEmitter.cpp
@@ -60,6 +60,7 @@ namespace {
     ARMJITInfo                *JTI;
     const ARMInstrInfo        *II;
     const TargetData          *TD;
+    const ARMSubtarget        *Subtarget;
     TargetMachine             &TM;
     CodeEmitter               &MCE;
     const std::vector<MachineConstantPoolEntry> *MCPEs;
@@ -163,7 +164,7 @@ namespace {
     /// Routines that handle operands which add machine relocations which are
     /// fixed up by the relocation stage.
     void emitGlobalAddress(GlobalValue *GV, unsigned Reloc,
-                           bool NeedStub, intptr_t ACPV = 0);
+                           bool NeedStub,  bool Indirect, intptr_t ACPV = 0);
     void emitExternalSymbolAddress(const char *ES, unsigned Reloc);
     void emitConstPoolAddress(unsigned CPI, unsigned Reloc);
     void emitJumpTableAddress(unsigned JTIndex, unsigned Reloc);
@@ -195,9 +196,10 @@ bool Emitter<CodeEmitter>::runOnMachineFunction(MachineFunction &MF) {
   assert((MF.getTarget().getRelocationModel() != Reloc::Default ||
           MF.getTarget().getRelocationModel() != Reloc::Static) &&
          "JIT relocation model must be set to static or default!");
+  JTI = ((ARMTargetMachine&)MF.getTarget()).getJITInfo();
   II = ((ARMTargetMachine&)MF.getTarget()).getInstrInfo();
   TD = ((ARMTargetMachine&)MF.getTarget()).getTargetData();
-  JTI = ((ARMTargetMachine&)MF.getTarget()).getJITInfo();
+  Subtarget = &TM.getSubtarget<ARMSubtarget>();
   MCPEs = &MF.getConstantPool()->getConstants();
   MJTEs = &MF.getJumpTableInfo()->getJumpTables();
   IsPIC = TM.getRelocationModel() == Reloc::PIC_;
@@ -244,7 +246,7 @@ unsigned Emitter<CodeEmitter>::getMachineOpValue(const MachineInstr &MI,
   else if (MO.isImm())
     return static_cast<unsigned>(MO.getImm());
   else if (MO.isGlobal())
-    emitGlobalAddress(MO.getGlobal(), ARM::reloc_arm_branch, true);
+    emitGlobalAddress(MO.getGlobal(), ARM::reloc_arm_branch, true, false);
   else if (MO.isSymbol())
     emitExternalSymbolAddress(MO.getSymbolName(), ARM::reloc_arm_branch);
   else if (MO.isCPI()) {
@@ -270,9 +272,14 @@ unsigned Emitter<CodeEmitter>::getMachineOpValue(const MachineInstr &MI,
 ///
 template<class CodeEmitter>
 void Emitter<CodeEmitter>::emitGlobalAddress(GlobalValue *GV, unsigned Reloc,
-                                             bool NeedStub, intptr_t ACPV) {
-  MCE.addRelocation(MachineRelocation::getGV(MCE.getCurrentPCOffset(), Reloc,
-                                             GV, ACPV, NeedStub));
+                                             bool NeedStub, bool Indirect,
+                                             intptr_t ACPV) {
+  MachineRelocation MR = Indirect
+    ? MachineRelocation::getIndirectSymbol(MCE.getCurrentPCOffset(), Reloc,
+                                           GV, ACPV, NeedStub)
+    : MachineRelocation::getGV(MCE.getCurrentPCOffset(), Reloc,
+                               GV, ACPV, NeedStub);
+  MCE.addRelocation(MR);
 }
 
 /// emitExternalSymbolAddress - Arrange for the address of an external symbol to
@@ -417,8 +424,11 @@ void Emitter<CodeEmitter>::emitConstPoolInstruction(const MachineInstr &MI) {
 
     GlobalValue *GV = ACPV->getGV();
     if (GV) {
+      Reloc::Model RelocM = TM.getRelocationModel();
       emitGlobalAddress(GV, ARM::reloc_arm_machine_cp_entry,
-                        isa<Function>(GV), (intptr_t)ACPV);
+                        isa<Function>(GV),
+                        Subtarget->GVIsIndirectSymbol(GV, RelocM),
+                        (intptr_t)ACPV);
      } else  {
       emitExternalSymbolAddress(ACPV->getSymbol(), ARM::reloc_arm_absolute);
     }
@@ -437,7 +447,7 @@ void Emitter<CodeEmitter>::emitConstPoolInstruction(const MachineInstr &MI) {
       });
 
     if (GlobalValue *GV = dyn_cast<GlobalValue>(CV)) {
-      emitGlobalAddress(GV, ARM::reloc_arm_absolute, isa<Function>(GV));
+      emitGlobalAddress(GV, ARM::reloc_arm_absolute, isa<Function>(GV), false);
       emitWordLE(0);
     } else if (const ConstantInt *CI = dyn_cast<ConstantInt>(CV)) {
       uint32_t Val = *(uint32_t*)CI->getValue().getRawData();
diff --git a/lib/Target/ARM/ARMJITInfo.cpp b/lib/Target/ARM/ARMJITInfo.cpp
index 754fafe0287..24990e67a38 100644
--- a/lib/Target/ARM/ARMJITInfo.cpp
+++ b/lib/Target/ARM/ARMJITInfo.cpp
@@ -145,6 +145,9 @@ void *ARMJITInfo::emitGlobalValueIndirectSym(const GlobalValue *GV, void *Ptr,
     llvm_unreachable("ERROR: Unable to mark indirect symbol writable");
   }
   JCE.emitWordLE((intptr_t)Ptr);
+  if (!sys::Memory::setRangeExecutable((void*)Addr, 4)) {
+    llvm_unreachable("ERROR: Unable to mark indirect symbol executable");
+  }
   void *PtrAddr = JCE.finishGVStub(GV);
   addIndirectSymAddr(Ptr, (intptr_t)PtrAddr);
   return PtrAddr;