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ARM: fix memory leak, simplify WoA stack probing

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This fixes the memory leak introduced with the initial addition of support for
WoA stack probing.  Now that the pseudo-instruction expansion can handle an
external symbol, use that to generate the load which simplifies the logic as
well as avoids the memory leak.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@207737 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Saleem Abdulrasool 2014-05-01 04:19:59 +00:00
parent fd2fb48924
commit a1a235f869
1 changed files with 3 additions and 9 deletions
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12
lib/Target/ARM/ARMFrameLowering.cpp
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@ -25,7 +25,6 @@
#include "llvm/CodeGen/RegisterScavenging.h"
#include "llvm/IR/CallingConv.h"
#include "llvm/IR/Function.h"
#include "llvm/IR/Module.h"
#include "llvm/MC/MCContext.h"
#include "llvm/Support/CommandLine.h"
#include "llvm/Target/TargetOptions.h"
@ -316,20 +315,15 @@ void ARMFrameLowering::emitPrologue(MachineFunction &MF) const {
.addReg(ARM::R4, RegState::Implicit);
break;
case CodeModel::Large:
case CodeModel::JITDefault: {
LLVMContext &Ctx = MF.getMMI().getModule()->getContext();
const GlobalValue *F =
Function::Create(FunctionType::get(Type::getVoidTy(Ctx), false),
GlobalValue::AvailableExternallyLinkage, "__chkstk");
case CodeModel::JITDefault:
BuildMI(MBB, MBBI, dl, TII.get(ARM::t2MOVi32imm), ARM::R12)
.addGlobalAddress(F);
.addExternalSymbol("__chkstk");
BuildMI(MBB, MBBI, dl, TII.get(ARM::BLX))
.addReg(ARM::R12, RegState::Kill)
.addReg(ARM::R4, RegState::Implicit);
break;
}
}
AddDefaultCC(AddDefaultPred(BuildMI(MBB, MBBI, dl, TII.get(ARM::t2SUBrr),
ARM::SP)