From 1191c0008b55b055b8bb855330eec1cc72e9213f Mon Sep 17 00:00:00 2001
From: Gagandeep Singh <gdp.1807@gmail.com>
Date: Thu, 21 Dec 2023 16:57:10 +0530
Subject: [PATCH 1/3] Following changes have been made,

DEV: Fix xt::empty in initialiser statement
DEV: Fix type of ArrayItem ASR node
---
 src/lc/clang_ast_to_asr.h | 25 +++++++++++++++----------
 1 file changed, 15 insertions(+), 10 deletions(-)

diff --git a/src/lc/clang_ast_to_asr.h b/src/lc/clang_ast_to_asr.h
index ce187dc..3f205c0 100644
--- a/src/lc/clang_ast_to_asr.h
+++ b/src/lc/clang_ast_to_asr.h
@@ -477,10 +477,7 @@ class ClangASTtoASRVisitor: public clang::RecursiveASTVisitor<ClangASTtoASRVisit
                 }
                 tmp = ASR::make_ArrayItem_t(al, Lloc(x), obj,
                     array_indices.p, array_indices.size(),
-                    ASRUtils::type_get_past_allocatable(
-                        ASRUtils::type_get_past_pointer(
-                            ASRUtils::type_get_past_array(
-                                ASRUtils::expr_type(obj)))),
+                    ASRUtils::extract_type(ASRUtils::expr_type(obj)),
                     ASR::arraystorageType::RowMajor, nullptr);
             } else {
                 throw std::runtime_error("Only indexing arrays is supported for now with operator().");
@@ -534,6 +531,9 @@ class ClangASTtoASRVisitor: public clang::RecursiveASTVisitor<ClangASTtoASRVisit
         if( cxx_operator_name.size() > 0 ) {
             func_name = cxx_operator_name;
         } else if( member_name.size() > 0 ) {
+            if( callee == nullptr ) {
+                throw std::runtime_error("Callee object not available.");
+            }
             func_name = member_name;
         } else {
             ASR::Var_t* callee_Var = ASR::down_cast<ASR::Var_t>(callee);
@@ -667,8 +667,12 @@ class ClangASTtoASRVisitor: public clang::RecursiveASTVisitor<ClangASTtoASRVisit
     }
 
     bool TraverseCallExpr(clang::CallExpr *x) {
+        cxx_operator_name.clear();
         TraverseStmt(x->getCallee());
-        ASR::expr_t* callee = ASRUtils::EXPR(tmp);
+        ASR::expr_t* callee = nullptr;
+        if( tmp != nullptr ) {
+            callee = ASRUtils::EXPR(tmp);
+        }
         if( check_and_handle_special_function(x, callee) ) {
             return true;
         }
@@ -843,7 +847,7 @@ class ClangASTtoASRVisitor: public clang::RecursiveASTVisitor<ClangASTtoASRVisit
             assignment_target = var;
             TraverseStmt(x->getInit());
             assignment_target = nullptr;
-            if( tmp != nullptr ) {
+            if( tmp != nullptr && !is_stmt_created ) {
                 ASR::expr_t* init_val = ASRUtils::EXPR(tmp);
                 add_reshape_if_needed(init_val, var);
                 tmp = ASR::make_Assignment_t(al, Lloc(x), var, init_val, nullptr);
@@ -1060,16 +1064,17 @@ class ClangASTtoASRVisitor: public clang::RecursiveASTVisitor<ClangASTtoASRVisit
     }
 
     bool TraverseDeclRefExpr(clang::DeclRefExpr* x) {
+        cxx_operator_name.clear();
         std::string name = x->getNameInfo().getAsString();
-        if( name == "operator<<" || name == "cout" ||
+        ASR::symbol_t* sym = resolve_symbol(name);
+        if( sym == nullptr &&
+            (name == "operator<<" || name == "cout" ||
             name == "endl" || name == "operator()" ||
             name == "operator+" || name == "operator=" ||
-            name == "view" || name == "empty" ) {
+            name == "view" || name == "empty" || name == "printf") ) {
             cxx_operator_name = name;
             return true;
         }
-        ASR::symbol_t* sym = resolve_symbol(name);
-        LCOMPILERS_ASSERT(sym != nullptr);
         tmp = ASR::make_Var_t(al, Lloc(x), sym);
         is_stmt_created = false;
         return true;

From 52169386ed7f50d1f800c797f1f51a5cc8323ced Mon Sep 17 00:00:00 2001
From: Gagandeep Singh <gdp.1807@gmail.com>
Date: Thu, 21 Dec 2023 17:02:38 +0530
Subject: [PATCH 2/3] TEST: Added test for xt::xtensor<...>

---
 integration_tests/array_08.cpp | 44 ++++++++++++++++++++++++++++++++++
 1 file changed, 44 insertions(+)
 create mode 100644 integration_tests/array_08.cpp

diff --git a/integration_tests/array_08.cpp b/integration_tests/array_08.cpp
new file mode 100644
index 0000000..fa0a962
--- /dev/null
+++ b/integration_tests/array_08.cpp
@@ -0,0 +1,44 @@
+#include <iostream>
+#include <xtensor/xtensor.hpp>
+#include "xtensor/xio.hpp"
+#include "xtensor/xview.hpp"
+
+xt::xtensor<double, 2> matmul(
+    xt::xtensor<double, 2>& a,
+    xt::xtensor<double, 2>& b) {
+    xt::xtensor<double, 2> ab = xt::empty<double>({a.shape(0), b.shape(1)});
+    for( int i = 0; i < a.shape(0); i++ ) {
+        for( int j = 0; j < b.shape(1); j++ ) {
+            ab(i, j) = 0;
+            for( int k = 0; k < a.shape(1); k++ ) {
+                ab(i, j) += a(i, k) * b(k, j);
+            }
+        }
+    }
+    return ab;
+}
+
+int main() {
+
+    xt::xtensor<double, 2> a = xt::empty<double>({3, 2});
+    xt::xtensor<double, 2> b = xt::empty<double>({2, 3});
+    xt::xtensor<double, 2> c = xt::empty<double>({3, 3});
+
+    for( int i = 0; i < a.shape(0); i++ ) {
+        for( int j = 0; j < a.shape(1); j++ ) {
+            a(i, j) = i * a.shape(0) * j;
+        }
+    }
+
+    for( int i = 0; i < b.shape(0); i++ ) {
+        for( int j = 0; j < b.shape(1); j++ ) {
+            b(i, j) = i * b.shape(0) * j;
+        }
+    }
+
+    std::cout << a << b << std::endl;
+    c = matmul(a, b);
+    std::cout << c << std::endl;
+
+    return 0;
+}

From e321e3a94431cf772cf32903a1c95809cd403a0a Mon Sep 17 00:00:00 2001
From: Gagandeep Singh <gdp.1807@gmail.com>
Date: Thu, 21 Dec 2023 17:02:50 +0530
Subject: [PATCH 3/3] TEST: Register array_08.cpp

---
 integration_tests/CMakeLists.txt | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/integration_tests/CMakeLists.txt b/integration_tests/CMakeLists.txt
index cfa54fd..3e6a855 100644
--- a/integration_tests/CMakeLists.txt
+++ b/integration_tests/CMakeLists.txt
@@ -198,3 +198,5 @@ RUN(NAME array_06.cpp LABELS gcc llvm NOFAST
     EXTRA_ARGS --extra-arg=-I${CONDA_PREFIX}/include)
 RUN(NAME array_07.cpp LABELS gcc llvm NOFAST
     EXTRA_ARGS --extra-arg=-I${CONDA_PREFIX}/include)
+RUN(NAME array_08.cpp LABELS gcc llvm NOFAST
+    EXTRA_ARGS --extra-arg=-I${CONDA_PREFIX}/include)