[clang] [CIR] Add array new cookie support (PR #163649)
Andy Kaylor via cfe-commits
cfe-commits at lists.llvm.org
Fri Oct 17 14:43:33 PDT 2025
================
@@ -1977,3 +1983,72 @@ mlir::Value CIRGenItaniumCXXABI::emitDynamicCast(CIRGenFunction &cgf,
return cgf.getBuilder().createDynCast(loc, src.getPointer(), destCIRTy,
isRefCast, castInfo);
}
+
+/************************** Array allocation cookies **************************/
+
+CharUnits CIRGenItaniumCXXABI::getArrayCookieSizeImpl(QualType elementType) {
+ // The array cookie is a size_t; pad that up to the element alignment.
+ // The cookie is actually right-justified in that space.
+ return std::max(
+ CharUnits::fromQuantity(cgm.SizeSizeInBytes),
+ cgm.getASTContext().getPreferredTypeAlignInChars(elementType));
+}
+
+Address CIRGenItaniumCXXABI::initializeArrayCookie(CIRGenFunction &cgf,
+ Address newPtr,
+ mlir::Value numElements,
+ const CXXNewExpr *e,
+ QualType elementType) {
+ assert(requiresArrayCookie(e));
+
+ // TODO: Get the address space when sanitizer support is implemented.
+
+ ASTContext &ctx = cgm.getASTContext();
+ CharUnits sizeSize = cgf.getSizeSize();
+ mlir::Location loc = cgf.getLoc(e->getSourceRange());
+
+ // The size of the cookie.
+ CharUnits cookieSize =
+ std::max(sizeSize, ctx.getPreferredTypeAlignInChars(elementType));
+ assert(cookieSize == getArrayCookieSizeImpl(elementType));
+
+ auto u8Ty = cgf.getBuilder().getUIntNTy(8);
+ auto u8PtrTy = cgf.getBuilder().getPointerTo(u8Ty);
----------------
andykaylor wrote:
```suggestion
cir::PointerType u8PtrTy = cgf.getBuilder().getUInt8PtrTy()
```
https://github.com/llvm/llvm-project/pull/163649
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