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PatchableFunction: Skip pseudos that do not create code

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This fixes http://llvm.org/PR28524

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@275278 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Matthias Braun
2016-07-13 16:37:29 +00:00
parent 929c941856
commit e01c09683d
2 changed files with 47 additions and 5 deletions
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lib/CodeGen/PatchableFunction.cpp
+23 -5
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@@ -37,6 +37,22 @@ struct PatchableFunction : public MachineFunctionPass {
};
}
/// Returns true if instruction \p MI will not result in actual machine code
/// instructions.
static bool doesNotGeneratecode(const MachineInstr &MI) {
// TODO: Introduce an MCInstrDesc flag for this
switch (MI.getOpcode()) {
default: return false;
case TargetOpcode::IMPLICIT_DEF:
case TargetOpcode::KILL:
case TargetOpcode::CFI_INSTRUCTION:
case TargetOpcode::EH_LABEL:
case TargetOpcode::GC_LABEL:
case TargetOpcode::DBG_VALUE:
return true;
}
}
bool PatchableFunction::runOnMachineFunction(MachineFunction &MF) {
if (!MF.getFunction()->hasFnAttribute("patchable-function"))
return false;
@@ -48,18 +64,20 @@ bool PatchableFunction::runOnMachineFunction(MachineFunction &MF) {
#endif
auto &FirstMBB = *MF.begin();
auto &FirstMI = *FirstMBB.begin();
MachineBasicBlock::iterator FirstActualI = FirstMBB.begin();
for (; doesNotGeneratecode(*FirstActualI); ++FirstActualI)
assert(FirstActualI != FirstMBB.end());
auto *TII = MF.getSubtarget().getInstrInfo();
auto MIB = BuildMI(FirstMBB, FirstMBB.begin(), FirstMI.getDebugLoc(),
auto MIB = BuildMI(FirstMBB, FirstActualI, FirstActualI->getDebugLoc(),
TII->get(TargetOpcode::PATCHABLE_OP))
.addImm(2)
.addImm(FirstMI.getOpcode());
.addImm(FirstActualI->getOpcode());
for (auto &MO : FirstMI.operands())
for (auto &MO : FirstActualI->operands())
MIB.addOperand(MO);
FirstMI.eraseFromParent();
FirstActualI->eraseFromParent();
MF.ensureAlignment(4);
return true;
}