[flang-commits] [flang] [flang] Add ability to have special allocator for descriptor data (PR #100690)

[Thirumalai Shaktivel via flang-commits]

Valentin Clement =?utf-8?b?KOODkOODrOODsw=?=,Valentin Clement
 <clementval at gmail.com>,Valentin Clement =?utf-8?b?KOODkOODrOODsw=?=,
Valentin Clement =?utf-8?b?KOODkOODrOODsw=?=,Valentin Clement
 <clementval at gmail.com>,Valentin Clement <clementval at gmail.com>,Valentin
 Clement <clementval at gmail.com>
Message-ID:
In-Reply-To: <llvm.org/llvm/llvm-project/pull/100690 at github.com>


================
@@ -420,6 +420,27 @@ class Descriptor {
 
   void Dump(FILE * = stdout) const;
 
+// Value of the addendum presence flag.
+#define _CFI_ADDENDUM_FLAG 1
+// Number of bits needed to be shifted when manipulating the allocator index.
+#define _CFI_ALLOCATOR_IDX_SHIFT 1
+// Allocator index mask.
+#define _CFI_ALLOCATOR_IDX_MASK 0b00001110
+
+  RT_API_ATTRS inline bool HasAddendum() const {
+    return raw_.extra & _CFI_ADDENDUM_FLAG;
+  }
+  RT_API_ATTRS inline void SetHasAddendum() {
+    raw_.extra |= _CFI_ADDENDUM_FLAG;
+  }
+  RT_API_ATTRS inline int GetAllocIdx() const {
+    return (raw_.extra & _CFI_ALLOCATOR_IDX_MASK) >> _CFI_ALLOCATOR_IDX_SHIFT;
+  }
+  RT_API_ATTRS inline void SetAllocIdx(int pos) {
+    raw_.extra &= ~_CFI_ALLOCATOR_IDX_MASK; // Clear the allocator index bits.
+    raw_.extra |= (pos << _CFI_ALLOCATOR_IDX_SHIFT);
----------------
Thirumalai-Shaktivel wrote:

With:
```
	[...]
    -DCMAKE_C_COMPILER=gcc \
    -DCMAKE_CXX_COMPILER=g++ \
    -DFLANG_ENABLE_WERROR=ON
```
I get the error.
With `-DFLANG_ENABLE_WERROR=OFF` gives some WARNING and it works 

https://github.com/llvm/llvm-project/pull/100690