From: Simon Pilgrim <llvm-dev@redking.me.uk>
Date: Tue, 7 Jun 2022 11:38:05 +0000 (+0100)
Subject: [X86] X86SpeculativeLoadHardening.cpp - pass DebugLoc by const reference not value.
X-Git-Tag: upstream/15.0.7~5666
X-Git-Url: http://review.tizen.org/git/?a=commitdiff_plain;h=5cea1553b885380101a0b1827120e4a544d302a6;p=platform%2Fupstream%2Fllvm.git

[X86] X86SpeculativeLoadHardening.cpp - pass DebugLoc by const reference not value.
---

diff --git a/llvm/lib/Target/X86/X86SpeculativeLoadHardening.cpp b/llvm/lib/Target/X86/X86SpeculativeLoadHardening.cpp
index 882dae7..3317db8 100644
--- a/llvm/lib/Target/X86/X86SpeculativeLoadHardening.cpp
+++ b/llvm/lib/Target/X86/X86SpeculativeLoadHardening.cpp
@@ -181,17 +181,18 @@ private:
   void tracePredStateThroughBlocksAndHarden(MachineFunction &MF);
 
   unsigned saveEFLAGS(MachineBasicBlock &MBB,
-                      MachineBasicBlock::iterator InsertPt, DebugLoc Loc);
+                      MachineBasicBlock::iterator InsertPt,
+                      const DebugLoc &Loc);
   void restoreEFLAGS(MachineBasicBlock &MBB,
-                     MachineBasicBlock::iterator InsertPt, DebugLoc Loc,
+                     MachineBasicBlock::iterator InsertPt, const DebugLoc &Loc,
                      Register Reg);
 
   void mergePredStateIntoSP(MachineBasicBlock &MBB,
-                            MachineBasicBlock::iterator InsertPt, DebugLoc Loc,
-                            unsigned PredStateReg);
+                            MachineBasicBlock::iterator InsertPt,
+                            const DebugLoc &Loc, unsigned PredStateReg);
   unsigned extractPredStateFromSP(MachineBasicBlock &MBB,
                                   MachineBasicBlock::iterator InsertPt,
-                                  DebugLoc Loc);
+                                  const DebugLoc &Loc);
 
   void
   hardenLoadAddr(MachineInstr &MI, MachineOperand &BaseMO,
@@ -203,7 +204,7 @@ private:
   bool canHardenRegister(Register Reg);
   unsigned hardenValueInRegister(Register Reg, MachineBasicBlock &MBB,
                                  MachineBasicBlock::iterator InsertPt,
-                                 DebugLoc Loc);
+                                 const DebugLoc &Loc);
   unsigned hardenPostLoad(MachineInstr &MI);
   void hardenReturnInstr(MachineInstr &MI);
   void tracePredStateThroughCall(MachineInstr &MI);
@@ -1500,7 +1501,7 @@ void X86SpeculativeLoadHardeningPass::tracePredStateThroughBlocksAndHarden(
 /// as the save so that no PHI nodes are inserted.
 unsigned X86SpeculativeLoadHardeningPass::saveEFLAGS(
     MachineBasicBlock &MBB, MachineBasicBlock::iterator InsertPt,
-    DebugLoc Loc) {
+    const DebugLoc &Loc) {
   // FIXME: Hard coding this to a 32-bit register class seems weird, but matches
   // what instruction selection does.
   Register Reg = MRI->createVirtualRegister(&X86::GR32RegClass);
@@ -1517,8 +1518,8 @@ unsigned X86SpeculativeLoadHardeningPass::saveEFLAGS(
 /// This must be done within the same basic block as the save in order to
 /// reliably lower.
 void X86SpeculativeLoadHardeningPass::restoreEFLAGS(
-    MachineBasicBlock &MBB, MachineBasicBlock::iterator InsertPt, DebugLoc Loc,
-    Register Reg) {
+    MachineBasicBlock &MBB, MachineBasicBlock::iterator InsertPt,
+    const DebugLoc &Loc, Register Reg) {
   BuildMI(MBB, InsertPt, Loc, TII->get(X86::COPY), X86::EFLAGS).addReg(Reg);
   ++NumInstsInserted;
 }
@@ -1528,8 +1529,8 @@ void X86SpeculativeLoadHardeningPass::restoreEFLAGS(
 /// a way that won't form non-canonical pointers and also will be preserved
 /// across normal stack adjustments.
 void X86SpeculativeLoadHardeningPass::mergePredStateIntoSP(
-    MachineBasicBlock &MBB, MachineBasicBlock::iterator InsertPt, DebugLoc Loc,
-    unsigned PredStateReg) {
+    MachineBasicBlock &MBB, MachineBasicBlock::iterator InsertPt,
+    const DebugLoc &Loc, unsigned PredStateReg) {
   Register TmpReg = MRI->createVirtualRegister(PS->RC);
   // FIXME: This hard codes a shift distance based on the number of bits needed
   // to stay canonical on 64-bit. We should compute this somehow and support
@@ -1549,7 +1550,7 @@ void X86SpeculativeLoadHardeningPass::mergePredStateIntoSP(
 /// Extracts the predicate state stored in the high bits of the stack pointer.
 unsigned X86SpeculativeLoadHardeningPass::extractPredStateFromSP(
     MachineBasicBlock &MBB, MachineBasicBlock::iterator InsertPt,
-    DebugLoc Loc) {
+    const DebugLoc &Loc) {
   Register PredStateReg = MRI->createVirtualRegister(PS->RC);
   Register TmpReg = MRI->createVirtualRegister(PS->RC);
 
@@ -1907,7 +1908,7 @@ bool X86SpeculativeLoadHardeningPass::canHardenRegister(Register Reg) {
 /// register class as `Reg`.
 unsigned X86SpeculativeLoadHardeningPass::hardenValueInRegister(
     Register Reg, MachineBasicBlock &MBB, MachineBasicBlock::iterator InsertPt,
-    DebugLoc Loc) {
+    const DebugLoc &Loc) {
   assert(canHardenRegister(Reg) && "Cannot harden this register!");
   assert(Reg.isVirtual() && "Cannot harden a physical register!");