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Revert "[X86] Support the "ms-hotpatch" attribute."

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This reverts commit r278048. Something changed between the last time I
built this--it takes awhile on my ridiculously slow and ancient
computer--and now that broke this.

llvm-svn: 278053
This commit is contained in:
Charles Davis
2016-08-08 21:20:15 +00:00
parent 0e37911334
commit e9c32c7ed3
12 changed files with 22 additions and 168 deletions
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30
llvm/lib/CodeGen/PatchableFunction.cpp
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@@ -13,11 +13,12 @@
//===----------------------------------------------------------------------===//
#include "llvm/CodeGen/Passes.h"
#include "llvm/Analysis/TargetTransformInfo.h"
#include "llvm/CodeGen/Analysis.h"
#include "llvm/CodeGen/MachineFunction.h"
#include "llvm/CodeGen/MachineFunctionPass.h"
#include "llvm/CodeGen/MachineInstrBuilder.h"
#include "llvm/Target/TargetFrameLowering.h"
#include "llvm/Target/TargetInstrInfo.h"
#include "llvm/Target/TargetSubtargetInfo.h"
using namespace llvm;
@@ -28,9 +29,8 @@ struct PatchableFunction : public MachineFunctionPass {
initializePatchableFunctionPass(*PassRegistry::getPassRegistry());
}
void getAnalysisUsage(AnalysisUsage &AU) const override;
bool runOnMachineFunction(MachineFunction &F) override;
MachineFunctionProperties getRequiredProperties() const override {
MachineFunctionProperties getRequiredProperties() const override {
return MachineFunctionProperties().set(
MachineFunctionProperties::Property::AllVRegsAllocated);
}
@@ -53,29 +53,31 @@ static bool doesNotGeneratecode(const MachineInstr &MI) {
}
}
void PatchableFunction::getAnalysisUsage(AnalysisUsage &AU) const {
MachineFunctionPass::getAnalysisUsage(AU);
AU.addRequired<TargetTransformInfoWrapperPass>();
}
bool PatchableFunction::runOnMachineFunction(MachineFunction &MF) {
if (!MF.getFunction()->hasFnAttribute("patchable-function"))
return false;
#ifndef NDEBUG
Attribute PatchAttr = MF.getFunction()->getFnAttribute("patchable-function");
StringRef PatchType = PatchAttr.getValueAsString();
assert((PatchType == "prologue-short-redirect" ||
PatchType == "ms-hotpatch") && "Only possibilities today!");
assert(PatchType == "prologue-short-redirect" && "Only possibility today!");
#endif
auto &FirstMBB = *MF.begin();
MachineBasicBlock::iterator FirstActualI = FirstMBB.begin();
for (; doesNotGeneratecode(*FirstActualI); ++FirstActualI)
assert(FirstActualI != FirstMBB.end());
const TargetTransformInfo &TTI =
getAnalysis<TargetTransformInfoWrapperPass>().getTTI(*MF.getFunction());
TTI.emitPatchableOp(PatchType, FirstMBB, FirstActualI);
auto *TII = MF.getSubtarget().getInstrInfo();
auto MIB = BuildMI(FirstMBB, FirstActualI, FirstActualI->getDebugLoc(),
TII->get(TargetOpcode::PATCHABLE_OP))
.addImm(2)
.addImm(FirstActualI->getOpcode());
for (auto &MO : FirstActualI->operands())
MIB.addOperand(MO);
FirstActualI->eraseFromParent();
MF.ensureAlignment(4);
return true;
}