================
@@ -701,3 +808,95 @@ void
CGHLSLRuntime::emitInitListOpaqueValues(CodeGenFunction &CGF,
}
}
}
+
+std::optional<LValue> CGHLSLRuntime::emitResourceArraySubscriptExpr(
+ const ArraySubscriptExpr *ArraySubsExpr, CodeGenFunction &CGF) {
+ assert(ArraySubsExpr->getType()->isHLSLResourceRecord() ||
+ ArraySubsExpr->getType()->isHLSLResourceRecordArray() &&
+ "expected resource array subscript expression");
+
+ // let clang codegen handle local resource array subscrips
+ const VarDecl *ArrayDecl = dyn_cast<VarDecl>(getArrayDecl(ArraySubsExpr));
+ if (!ArrayDecl || !ArrayDecl->hasGlobalStorage())
+ return std::nullopt;
+
+ // FIXME: this is not yet implemented (llvm/llvm-project#145426)
+ assert(!ArraySubsExpr->getType()->isArrayType() &&
+ "indexing of array subsets it not supported yet");
+
+ // get total array size (= range size)
+ const Type *ResArrayTy = ArrayDecl->getType().getTypePtr();
+ assert(ResArrayTy->isHLSLResourceRecordArray() &&
+ "expected array of resource classes");
+ llvm::Value *Range =
+ llvm::ConstantInt::get(CGM.IntTy, getTotalArraySize(ResArrayTy));
+
+ // Iterate through all nested array subscript expressions to calculate
+ // the index in the flattened resource array (if this is a multi-
+ // dimensional array). The index is calculated as a sum of all indices
+ // multiplied by the total size of the array at that level.
+ Value *Index = nullptr;
+ Value *Multiplier = nullptr;
+ const ArraySubscriptExpr *ASE = ArraySubsExpr;
+ while (ASE != nullptr) {
+ Value *SubIndex = CGF.EmitScalarExpr(ASE->getIdx());
----------------
bob80905 wrote:
Could SubIndex ever be null?
https://github.com/llvm/llvm-project/pull/152454
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