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Fix access to whole sub-structs (#3086)

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* Add support for accessing whole struct
* Update tests

Signed-off-by: Kamil Rakoczy <krakoczy@antmicro.com>
This commit is contained in:
Kamil Rakoczy 2022-02-14 14:34:20 +01:00 • committed by GitHub
parent 59738c09be
commit 68c67c40ec
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GPG key ID: 4AEE18F83AFDEB23
7 changed files with 72 additions and 11 deletions
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2
frontends/ast/genrtlil.cc
View file

@ -877,7 +877,7 @@ void AstNode::detectSignWidthWorker(int &width_hint, bool &sign_hint, bool *foun
this_width = id_ast->children[0]->range_left - id_ast->children[0]->range_right + 1;
if (children.size() > 1)
range = children[1];
} else if (id_ast->type == AST_STRUCT_ITEM) {
} else if (id_ast->type == AST_STRUCT_ITEM || id_ast->type == AST_STRUCT) {
AstNode *tmp_range = make_struct_member_range(this, id_ast);
this_width = tmp_range->range_left - tmp_range->range_right + 1;
delete tmp_range;

22
frontends/ast/simplify.cc
View file

@ -307,6 +307,10 @@ static int size_packed_struct(AstNode *snode, int base_offset)
if (node->type == AST_STRUCT || node->type == AST_UNION) {
// embedded struct or union
width = size_packed_struct(node, base_offset + offset);
// set range of struct
node->range_right = base_offset + offset;
node->range_left = base_offset + offset + width - 1;
node->range_valid = true;
}
else {
log_assert(node->type == AST_STRUCT_ITEM);
@ -493,14 +497,12 @@ static void add_members_to_scope(AstNode *snode, std::string name)
// in case later referenced in assignments
log_assert(snode->type==AST_STRUCT || snode->type==AST_UNION);
for (auto *node : snode->children) {
auto member_name = name + "." + node->str;
current_scope[member_name] = node;
if (node->type != AST_STRUCT_ITEM) {
// embedded struct or union
add_members_to_scope(node, name + "." + node->str);
}
else {
auto member_name = name + "." + node->str;
current_scope[member_name] = node;
}
}
}
@ -1341,6 +1343,16 @@ bool AstNode::simplify(bool const_fold, bool at_zero, bool in_lvalue, int stage,
case AST_PARAMETER:
case AST_LOCALPARAM:
// if parameter is implicit type which is the typename of a struct or union,
// save information about struct in wiretype attribute
if (children[0]->type == AST_IDENTIFIER && current_scope.count(children[0]->str) > 0) {
auto item_node = current_scope[children[0]->str];
if (item_node->type == AST_STRUCT || item_node->type == AST_UNION) {
attributes[ID::wiretype] = item_node->clone();
size_packed_struct(attributes[ID::wiretype], 0);
add_members_to_scope(attributes[ID::wiretype], str);
}
}
while (!children[0]->basic_prep && children[0]->simplify(false, false, false, stage, -1, false, true) == true)
did_something = true;
children[0]->detectSignWidth(width_hint, sign_hint);
@ -2018,7 +2030,7 @@ bool AstNode::simplify(bool const_fold, bool at_zero, bool in_lvalue, int stage,
if (name_has_dot(str, sname)) {
if (current_scope.count(str) > 0) {
auto item_node = current_scope[str];
if (item_node->type == AST_STRUCT_ITEM) {
if (item_node->type == AST_STRUCT_ITEM || item_node->type == AST_STRUCT) {
// structure member, rewrite this node to reference the packed struct wire
auto range = make_struct_member_range(this, item_node);
newNode = new AstNode(AST_IDENTIFIER, range);