[StackMaps] Add explicit location size accessor to the stackmap parser

The reserved uint8 field in the location block of the stackmap record is used to denote the size of the location.

Patch By: jacob.hughes@kcl.ac.uk
Differential Revision: https://reviews.llvm.org/D59167

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@358319 91177308-0d34-0410-b5e6-96231b3b80d8

diff --git a/include/llvm/Object/StackMapParser.h b/include/llvm/Object/StackMapParser.h
index 8817516eb2128f1c14ee9ec21270548db60712a3..50e4bae13a5b039d09bcbfb655bed7cf3ab92131 100644 (file)
--- a/include/llvm/Object/StackMapParser.h
+++ b/include/llvm/Object/StackMapParser.h
@@ -114,6 +114,12 @@ public:
       return LocationKind(P[KindOffset]);
     }
 
+    /// Get the Size for this location.
+    uint8_t getSize() const {
+        return read<uint8_t>(P + SizeOffset);
+
+    }
+
     /// Get the Dwarf register number for this location.
     uint16_t getDwarfRegNum() const {
       return read<uint16_t>(P + DwarfRegNumOffset);
@@ -148,7 +154,8 @@ public:
     }
 
     static const int KindOffset = 0;
-    static const int DwarfRegNumOffset = KindOffset + sizeof(uint16_t);
+    static const int SizeOffset = KindOffset + sizeof(uint8_t);
+    static const int DwarfRegNumOffset = SizeOffset + sizeof(uint8_t);
     static const int SmallConstantOffset = DwarfRegNumOffset + sizeof(uint16_t);
     static const int LocationAccessorSize = sizeof(uint64_t);