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sv: Add support for memories of a typedef

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Signed-off-by: David Shah <dave@ds0.me>
This commit is contained in:
David Shah 2019-09-20 11:46:37 +01:00
parent 30d2326030
commit af25585170
2 changed files with 30 additions and 6 deletions
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24
frontends/ast/simplify.cc
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@ -793,9 +793,9 @@ bool AstNode::simplify(bool const_fold, bool at_zero, bool in_lvalue, int stage,
}
// resolve types of wires
if (type == AST_WIRE) {
if (type == AST_WIRE || type == AST_MEMORY) {
if (is_custom_type) {
log_assert(children.size() == 1);
log_assert(children.size() >= 1);
log_assert(children[0]->type == AST_WIRETYPE);
if (!current_scope.count(children[0]->str))
log_file_error(filename, linenum, "Unknown identifier `%s' used as type name\n", children[0]->str.c_str());
@ -804,11 +804,14 @@ bool AstNode::simplify(bool const_fold, bool at_zero, bool in_lvalue, int stage,
log_file_error(filename, linenum, "`%s' does not name a type\n", children[0]->str.c_str());
log_assert(resolved_type->children.size() == 1);
AstNode *templ = resolved_type->children[0];
delete_children(); // type reference no longer needed
// Remove type reference
delete children[0];
children.erase(children.begin());
// Ensure typedef itself is fully simplified
while(templ->simplify(const_fold, at_zero, in_lvalue, stage, width_hint, sign_hint, in_param)) {};
if (type == AST_WIRE)
type = templ->type;
is_reg = templ->is_reg;
is_logic = templ->is_logic;
@ -820,8 +823,19 @@ bool AstNode::simplify(bool const_fold, bool at_zero, bool in_lvalue, int stage,
range_swapped = templ->range_swapped;
range_left = templ->range_left;
range_right = templ->range_right;
for (auto template_child : templ->children)
children.push_back(template_child->clone());
// Insert clones children from template at beginning
for (int i = 0; i < GetSize(templ->children); i++)
children.insert(children.begin() + i, templ->children[i]->clone());
if (type == AST_MEMORY && GetSize(children) == 1) {
// Single-bit memories must have [0:0] range
AstNode *rng = new AstNode(AST_RANGE);
rng->children.push_back(AstNode::mkconst_int(0, true));
rng->children.push_back(AstNode::mkconst_int(0, true));
children.insert(children.begin(), rng);
}
did_something = true;
}
log_assert(!is_custom_type);

10
tests/svtypes/typedef_memory_2.sv Normal file
View file

@ -0,0 +1,10 @@
module top(input [3:0] addr, wdata, input clk, wen, output reg [3:0] rdata);
typedef logic [3:0] nibble;
nibble mem[0:15];
always @(posedge clk) begin
if (wen) mem[addr] <= wdata;
rdata <= mem[addr];
end
endmodule