================
@@ -740,16 +764,182 @@ Interpreter::Visit(const BooleanLiteralNode *node) {
return ValueObject::CreateValueObjectFromBool(m_target, value, "result");
}
+llvm::Expected<CastKind>
+Interpreter::VerifyCastType(lldb::ValueObjectSP operand, CompilerType op_type,
+ CompilerType target_type, int location) {
+
+ if (target_type.IsScalarType()) {
+ if (op_type.IsPointerType() || op_type.IsNullPtrType()) {
+ // Cast from pointer to float/double is not allowed.
+ if (target_type.IsFloat()) {
+ std::string errMsg = llvm::formatv(
+ "Cast from {0} to {1} is not allowed", op_type.TypeDescription(),
+ target_type.TypeDescription());
+ return llvm::make_error<DILDiagnosticError>(
+ m_expr, std::move(errMsg), location,
+ op_type.TypeDescription().length());
+ }
+ // Casting pointer to bool is valid. Otherwise check if the result type
+ // is at least as big as the pointer size.
+ uint64_t type_byte_size = 0;
+ uint64_t rhs_type_byte_size = 0;
+ if (auto temp = target_type.GetByteSize(m_exe_ctx_scope.get()))
+ type_byte_size = *temp;
+ if (auto temp = op_type.GetByteSize(m_exe_ctx_scope.get()))
+ rhs_type_byte_size = *temp;
+ if (!target_type.IsBoolean() && type_byte_size < rhs_type_byte_size) {
+ std::string errMsg = llvm::formatv(
+ "cast from pointer to smaller type {0} loses information",
+ target_type.TypeDescription());
+ return llvm::make_error<DILDiagnosticError>(
+ m_expr, std::move(errMsg), location,
+ op_type.TypeDescription().length());
+ }
+ } else if (!op_type.IsScalarType() && !op_type.IsEnumerationType()) {
+ // Otherwise accept only arithmetic types and enums.
+ std::string errMsg = llvm::formatv(
+ "cannot convert {0} to {1} without a conversion operator",
+ op_type.TypeDescription(), target_type.TypeDescription());
+
+ return llvm::make_error<DILDiagnosticError>(
+ m_expr, std::move(errMsg), location,
+ op_type.TypeDescription().length());
+ }
+ return CastKind::eArithmetic;
+ }
+
+ if (target_type.IsEnumerationType()) {
+ // Cast to enum type.
+ if (!op_type.IsScalarType() && !op_type.IsEnumerationType()) {
+ std::string errMsg = llvm::formatv("Cast from {0} to {1} is not allowed",
+ op_type.TypeDescription(),
+ target_type.TypeDescription());
+
+ return llvm::make_error<DILDiagnosticError>(
+ m_expr, std::move(errMsg), location,
+ op_type.TypeDescription().length());
+ }
+ return CastKind::eEnumeration;
+ }
+
+ if (target_type.IsPointerType()) {
+ if (!op_type.IsInteger() && !op_type.IsEnumerationType() &&
+ !op_type.IsArrayType() && !op_type.IsPointerType() &&
+ !op_type.IsNullPtrType()) {
+ std::string errMsg = llvm::formatv(
+ "cannot cast from type {0} to pointer type {1}",
+ op_type.TypeDescription(), target_type.TypeDescription());
+
+ return llvm::make_error<DILDiagnosticError>(
+ m_expr, std::move(errMsg), location,
+ op_type.TypeDescription().length());
+ }
+ return CastKind::ePointer;
+ }
+
+ if (target_type.IsNullPtrType()) {
+ // Cast to nullptr type.
+ bool is_signed;
+ if (!target_type.IsNullPtrType() &&
----------------
Michael137 wrote:
This condition can never fire since we already checked
`target_type.IsNullPtrType()`
What's the intention behind these checks?
https://github.com/llvm/llvm-project/pull/170332
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