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Merged
merged 1 commit into from
Dec 27, 2022
Merged

Make is_dataclass robust #1385

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3 changes: 2 additions & 1 deletion integration_tests/structs_14.py
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Original file line number Diff line number Diff line change
@@ -1,4 +1,4 @@
from ltypes import i8, dataclass, i32, f32, c32, f64, i16, i64, c64, ccallable
from ltypes import i8, dataclass, i32, f32, c32, f64, i16, i64, c64, ccallable, packed
from numpy import empty, int8, int16, int32, int64, float32, complex64, complex128, float64
from copy import deepcopy

Expand All @@ -14,6 +14,7 @@ class buffer_struct:
buffer7: c64[32]

@ccallable
@packed
@dataclass
class buffer_struct_clink:
buffer: i8[32]
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101 changes: 32 additions & 69 deletions src/lpython/semantics/python_ast_to_asr.cpp
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Original file line number Diff line number Diff line change
Expand Up @@ -2133,80 +2133,43 @@ class CommonVisitor : public AST::BaseVisitor<Struct> {

bool is_dataclass(AST::expr_t** decorators, size_t n,
ASR::expr_t*& aligned_expr, bool& is_packed) {
if( n == 1 ) {
AST::expr_t* decorator = decorators[0];
if( !AST::is_a<AST::Name_t>(*decorator) ) {
return false;
}

AST::Name_t* dec_name = AST::down_cast<AST::Name_t>(decorator);
return std::string(dec_name->m_id) == "dataclass";
} else if( n == 2 ) {

if( AST::is_a<AST::Name_t>(*decorators[0]) &&
AST::is_a<AST::Name_t>(*decorators[1]) ) {
AST::Name_t* dc1_name = AST::down_cast<AST::Name_t>(decorators[0]);
AST::Name_t* dc2_name = AST::down_cast<AST::Name_t>(decorators[1]);
std::string dc1_str = dc1_name->m_id;
std::string dc2_str = dc2_name->m_id;
if( dc2_str == "packed" || dc1_str == "packed" ) {
bool is_dataclass_ = false;
for( size_t i = 0; i < n; i++ ) {
if( AST::is_a<AST::Name_t>(*decorators[i]) ) {
AST::Name_t* dc_name = AST::down_cast<AST::Name_t>(decorators[i]);
is_dataclass_ = std::string(dc_name->m_id) == "dataclass";
} else if( AST::is_a<AST::Call_t>(*decorators[i]) ) {
AST::Call_t* dc_call = AST::down_cast<AST::Call_t>(decorators[i]);
AST::Name_t* dc_name = AST::down_cast<AST::Name_t>(dc_call->m_func);
if( std::string(dc_name->m_id) == "packed" ) {
is_packed = true;
if( dc_call->n_keywords == 1 && dc_call->n_args == 0 ) {
AST::keyword_t kwarg = dc_call->m_keywords[0];
std::string kwarg_name = kwarg.m_arg;
if( kwarg_name == "aligned" ) {
this->visit_expr(*kwarg.m_value);
aligned_expr = ASRUtils::EXPR(tmp);
ASR::expr_t* aligned_expr_value = ASRUtils::expr_value(aligned_expr);
std::string msg = "Alignment should always evaluate to a constant expressions.";
if( !aligned_expr_value ) {
throw SemanticError(msg, aligned_expr->base.loc);
}
int64_t alignment_int;
if( !ASRUtils::extract_value(aligned_expr_value, alignment_int) ) {
throw SemanticError(msg, aligned_expr->base.loc);
}
if( alignment_int == 0 || ((alignment_int & (alignment_int - 1)) != 0) ) {
throw SemanticError("Alignment " + std::to_string(alignment_int) +
" is not a positive power of 2.",
aligned_expr->base.loc);
}
}
}
}
aligned_expr = nullptr;
return ((dc1_str == "dataclass" && (dc2_str == "packed" || dc2_str == "ccallable")) ||
((dc1_str == "packed" || dc1_str == "ccallable") && dc2_str == "dataclass"));
}

int32_t dc_idx = -1, pck_idx = -1;
if( AST::is_a<AST::Name_t>(*decorators[0]) &&
AST::is_a<AST::Call_t>(*decorators[1]) ) {
dc_idx = 0, pck_idx = 1;
} else if( AST::is_a<AST::Call_t>(*decorators[0]) &&
AST::is_a<AST::Name_t>(*decorators[1]) ) {
dc_idx = 1, pck_idx = 0;
}
if( dc_idx == -1 || pck_idx == -1 ) {
return false;
}
AST::Name_t* dc_name = AST::down_cast<AST::Name_t>(decorators[dc_idx]);
if( std::string(dc_name->m_id) != "dataclass" ) {
return false;
}
AST::Call_t* pck_call = AST::down_cast<AST::Call_t>(decorators[pck_idx]);
AST::Name_t* pck_name = AST::down_cast<AST::Name_t>(pck_call->m_func);
if( std::string(pck_name->m_id) != "packed" ) {
return false;
}
if( !(pck_call->n_keywords == 1 && pck_call->n_args == 0) ) {
return false;
}

AST::keyword_t kwarg = pck_call->m_keywords[0];
std::string kwarg_name = kwarg.m_arg;
if( kwarg_name != "aligned" ) {
return false;
}
this->visit_expr(*kwarg.m_value);
aligned_expr = ASRUtils::EXPR(tmp);
ASR::expr_t* aligned_expr_value = ASRUtils::expr_value(aligned_expr);
std::string msg = "Alignment should always evaluate to a constant expressions.";
if( !aligned_expr_value ) {
throw SemanticError(msg, aligned_expr->base.loc);
}
int64_t alignment_int;
if( !ASRUtils::extract_value(aligned_expr_value, alignment_int) ) {
throw SemanticError(msg, aligned_expr->base.loc);
}
if( alignment_int == 0 || ((alignment_int & (alignment_int - 1)) != 0) ) {
throw SemanticError("Alignment " + std::to_string(alignment_int) +
" is not a positive power of 2.",
aligned_expr->base.loc);
}
is_packed = true;
return true;
}

return false;
return is_dataclass_;
}

bool is_enum(AST::expr_t** bases, size_t n) {
Expand Down