[lldb][RISCV] add function calls tests

Function calls support in LLDB expressions for RISCV: 5 of 5

Adds tests on function calls inside lldb expressions

Author: dlav-sc

lldb/test/API/riscv/expressions/Makefile

@@ -0,0 +1,3 @@
+CXX_SOURCES := main.cpp
+
+include Makefile.rules

lldb/test/API/riscv/expressions/TestExpressions.py

@@ -0,0 +1,88 @@
+"""
+Test RISC-V expressions evaluation.
+"""
+
+import lldb
+from lldbsuite.test.decorators import *
+from lldbsuite.test.lldbtest import *
+from lldbsuite.test import lldbutil
+
+
+class TestExpressions(TestBase):
+
+    def common_setup(self):
+        self.build()
+        lldbutil.run_to_source_breakpoint(
+            self, "// break here", lldb.SBFileSpec("main.cpp")
+        )
+
+    @skipIf(archs=no_match(["rv64gc"]))
+    def test_int_arg(self):
+        self.common_setup()
+        self.expect_expr("foo(foo(5), foo())", result_type="int", result_value="8")
+    
+    @skipIf(archs=no_match(["rv64gc"]))
+    def test_double_arg(self):
+        self.common_setup()
+        self.expect(
+            "expr func_with_double_arg(1, 6.5)",
+            error=True,
+            substrs=["Architecture passes failure on function $__lldb_expr"],
+        )
+
+    @skipIf(archs=no_match(["rv64gc"]))
+    def test_ptr_arg(self):
+        self.common_setup()
+        self.expect(
+            "expr func_with_ptr_arg(\"bla\")",
+            error=True,
+            substrs=["Architecture passes failure on function $__lldb_expr"],
+        )
+
+    @skipIf(archs=no_match(["rv64gc"]))
+    def test_struct_arg(self):
+        self.common_setup()
+        self.expect_expr("func_with_struct_arg(s)", result_type="int", result_value="3")
+
+    @skipIf(archs=no_match(["rv64gc"]))
+    def test_unsupported_struct_arg(self):
+        self.common_setup()
+        self.expect(
+            "expr func_with_unsupported_struct_arg(u)",
+            error=True,
+            substrs=["Architecture passes failure on function $__lldb_expr"],
+        )
+
+    @skipIf(archs=no_match(["rv64gc"]))
+    def test_double_ret_val(self):
+        self.common_setup()
+
+        self.expect(
+            "expr func_with_double_return()",
+            error=True,
+            substrs=["Architecture passes failure on function $__lldb_expr"],
+        )
+
+    @skipIf(archs=no_match(["rv64gc"]))
+    def test_ptr_ret_val(self):
+        self.common_setup()
+        self.expect(
+            "expr func_with_ptr_return()",
+            error=True,
+            substrs=["Architecture passes failure on function $__lldb_expr"],
+        )
+
+    @skipIf(archs=no_match(["rv64gc"]))
+    def test_struct_return(self):
+        self.common_setup()
+        self.expect_expr("func_with_struct_return()", result_type="S")
+
+    @skipIf(archs=no_match(["rv64gc"]))
+    def test_ptr_ret_val(self):
+        self.common_setup()
+        self.expect(
+            "expr func_with_unsupported_struct_return()",
+            error=True,
+            substrs=["Architecture passes failure on function $__lldb_expr"],
+        )
+     

lldb/test/API/riscv/expressions/main.cpp

@@ -0,0 +1,51 @@
+struct S {
+  int a;
+  int b;
+};
+
+struct U {
+  int a;
+  double d;
+};
+
+int g;
+
+int func_with_double_arg(int a, double b) { return 1; }
+
+int func_with_ptr_arg(char *msg) { return 2; }
+
+int func_with_struct_arg(struct S s) { return 3; }
+
+int func_with_unsupported_struct_arg(struct U u) { return 4; }
+
+double func_with_double_return() { return 42.0; }
+
+int *func_with_ptr_return() { return &g; }
+
+struct S func_with_struct_return() {
+  struct S s = {3, 4};
+  return s;
+}
+
+struct U func_with_unsupported_struct_return() {
+  struct U u = {3, 42.0};
+  return u;
+}
+
+int foo() { return 3; }
+
+int foo(int a) { return a; }
+
+int foo(int a, int b) { return a + b; }
+
+int main() {
+  struct S s = {1, 2};
+  struct U u = {1, 1.0};
+  double d = func_with_double_arg(1, 1.0) + func_with_ptr_arg("msg") +
+             func_with_struct_arg(s) + func_with_double_return() +
+             func_with_unsupported_struct_arg(u) + foo() + foo(1) + foo(1, 2);
+  int *ptr = func_with_ptr_return();
+  s = func_with_struct_return();
+  u = func_with_unsupported_struct_return();
+  return 0; // break here
+}