Fix a stackmap bug introduced in r220710.

[oota-llvm.git] / lib / Target / X86 / X86MCInstLower.cpp

diff --git a/lib/Target/X86/X86MCInstLower.cpp b/lib/Target/X86/X86MCInstLower.cpp
index 004d2aca941c675baf104fe9dfb9e1da10c2ad17..4e0d594238c2ef09bed5961876b489354e03e779 100644 (file)
--- a/lib/Target/X86/X86MCInstLower.cpp
+++ b/lib/Target/X86/X86MCInstLower.cpp
@@ -264,7 +264,8 @@ MCOperand X86MCInstLower::LowerSymbolOperand(const MachineOperand &MO,
     Expr = MCBinaryExpr::CreateSub(Expr,
                             MCSymbolRefExpr::Create(MF.getPICBaseSymbol(), Ctx),
                                    Ctx);
-    if (MO.isJTI() && MAI.hasSetDirective()) {
+    if (MO.isJTI()) {
+      assert(MAI.doesSetDirectiveSuppressesReloc());
       // If .set directive is supported, use it to reduce the number of
       // relocations the assembler will generate for differences between
       // local labels. This is only safe when the symbols are in the same
@@ -1098,7 +1099,8 @@ void X86AsmPrinter::EmitInstruction(const MachineInstr *MI) {
     // a constant shuffle mask. We won't be able to do this at the MC layer
     // because the mask isn't an immediate.
   case X86::PSHUFBrm:
-  case X86::VPSHUFBrm: {
+  case X86::VPSHUFBrm:
+  case X86::VPSHUFBYrm: {
     if (!OutStreamer.isVerboseAsm())
       break;
     assert(MI->getNumOperands() > 5 &&
@@ -1207,5 +1209,21 @@ void X86AsmPrinter::EmitInstruction(const MachineInstr *MI) {
 
   MCInst TmpInst;
   MCInstLowering.Lower(MI, TmpInst);
+
+  // Stackmap shadows cannot include branch targets, so we can count the bytes
+  // in a call towards the shadow, but must ensure that the no thread returns
+  // in to the stackmap shadow.  The only way to achieve this is if the call
+  // is at the end of the shadow.
+  if (MI->isCall()) {
+    // Count then size of the call towards the shadow
+    SMShadowTracker.count(TmpInst, getSubtargetInfo());
+    // Then flush the shadow so that we fill with nops before the call, not
+    // after it.
+    SMShadowTracker.emitShadowPadding(OutStreamer, getSubtargetInfo());
+    // Then emit the call
+    OutStreamer.EmitInstruction(TmpInst, getSubtargetInfo());
+    return;
+  }
+
   EmitAndCountInstruction(TmpInst);
 }