Revert "X86: Align the stack on word boundaries in LowerFormalArguments()"

[oota-llvm.git] / lib / Target / X86 / X86AsmPrinter.h

diff --git a/lib/Target/X86/X86AsmPrinter.h b/lib/Target/X86/X86AsmPrinter.h
index 4b9913c01e63714a79a4e6ba9cd18184d39fb1ac..48248dd70f3f801caa3945408ee1902db111ce77 100644 (file)
--- a/lib/Target/X86/X86AsmPrinter.h
+++ b/lib/Target/X86/X86AsmPrinter.h
@@ -7,8 +7,8 @@
 //
 //===----------------------------------------------------------------------===//
 
-#ifndef X86ASMPRINTER_H
-#define X86ASMPRINTER_H
+#ifndef LLVM_LIB_TARGET_X86_X86ASMPRINTER_H
+#define LLVM_LIB_TARGET_X86_X86ASMPRINTER_H
 
 #include "X86Subtarget.h"
 #include "llvm/CodeGen/AsmPrinter.h"
@@ -44,16 +44,27 @@ class LLVM_LIBRARY_VISIBILITY X86AsmPrinter : public AsmPrinter {
     ~StackMapShadowTracker();
     void startFunction(MachineFunction &MF);
     void count(MCInst &Inst, const MCSubtargetInfo &STI);
+
+    // Called to signal the start of a shadow of RequiredSize bytes.
     void reset(unsigned RequiredSize) {
       RequiredShadowSize = RequiredSize;
       CurrentShadowSize = 0;
-      Count = true;
+      InShadow = true;
     }
+
+    // Called before every stackmap/patchpoint, and at the end of basic blocks,
+    // to emit any necessary padding-NOPs.
     void emitShadowPadding(MCStreamer &OutStreamer, const MCSubtargetInfo &STI);
   private:
     TargetMachine &TM;
     std::unique_ptr<MCCodeEmitter> CodeEmitter;
-    bool Count;
+    bool InShadow;
+
+    // RequiredShadowSize holds the length of the shadow specified in the most
+    // recently encountered STACKMAP instruction.
+    // CurrentShadowSize counts the number of bytes encoded since the most
+    // recently encountered STACKMAP, stopping when that number is greater than
+    // or equal to RequiredShadowSize.
     unsigned RequiredShadowSize, CurrentShadowSize;
   };