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Add "noblackbox" attribute 

Signed-off-by: Clifford Wolf <clifford@clifford.at>
This commit is contained in:
Clifford Wolf 2019-04-21 11:40:09 +02:00
parent fb7f02be55
commit 5b7fea5245
2 changed files with 33 additions and 18 deletions
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7
README.md
View File

@ -310,7 +310,12 @@ Verilog Attributes and non-standard features
that have the same ports as the real thing but do not contain information
on the internal configuration. This modules are only used by the synthesis
passes to identify input and output ports of cells. The Verilog backend
also does not output blackbox modules on default.
also does not output blackbox modules on default. ``read_verilog``, unless
called with ``-noblackbox`` will automatically set the blackbox attribute
on any empty module it reads.
- The ``noblackbox`` attribute set on an empty module prevents ``read_verilog``
from automatically setting the blackbox attribute on the module.
- The ``whitebox`` attribute on modules triggers the same behavior as
``blackbox``, but is for whitebox modules, i.e. library modules that

44
frontends/ast/ast.cc
View File

@ -942,6 +942,20 @@ static AstModule* process_module(AstNode *ast, bool defer, AstNode *original_ast
if (!defer)
{
bool blackbox_module = flag_lib;
if (!blackbox_module && !flag_noblackbox) {
blackbox_module = true;
for (auto child : ast->children) {
if (child->type == AST_WIRE && (child->is_input || child->is_output))
continue;
if (child->type == AST_PARAMETER || child->type == AST_LOCALPARAM)
continue;
blackbox_module = false;
break;
}
}
while (ast->simplify(!flag_noopt, false, false, 0, -1, false, false)) { }
if (flag_dump_ast2) {
@ -976,35 +990,31 @@ static AstModule* process_module(AstNode *ast, bool defer, AstNode *original_ast
}
}
bool blackbox_module = flag_lib;
if (!blackbox_module && ast->attributes.count("\\blackbox")) {
AstNode *n = ast->attributes.at("\\blackbox");
if (n->type != AST_CONSTANT)
log_file_error(ast->filename, ast->linenum, "Blackbox attribute with non-constant value!\n");
log_file_error(ast->filename, ast->linenum, "Got blackbox attribute with non-constant value!\n");
blackbox_module = n->asBool();
}
if (!blackbox_module && !flag_noblackbox)
{
for (auto child : ast->children) {
if (child->type == AST_WIRE && (child->is_input || child->is_output))
continue;
if (child->type == AST_PARAMETER || child->type == AST_LOCALPARAM)
continue;
goto noblackbox;
}
blackbox_module = 1;
}
noblackbox:
if (blackbox_module && ast->attributes.count("\\whitebox")) {
AstNode *n = ast->attributes.at("\\whitebox");
if (n->type != AST_CONSTANT)
log_file_error(ast->filename, ast->linenum, "Whitebox attribute with non-constant value!\n");
log_file_error(ast->filename, ast->linenum, "Got whitebox attribute with non-constant value!\n");
blackbox_module = !n->asBool();
}
if (ast->attributes.count("\\noblackbox")) {
if (blackbox_module) {
AstNode *n = ast->attributes.at("\\noblackbox");
if (n->type != AST_CONSTANT)
log_file_error(ast->filename, ast->linenum, "Got noblackbox attribute with non-constant value!\n");
blackbox_module = !n->asBool();
}
delete ast->attributes.at("\\noblackbox");
ast->attributes.erase("\\noblackbox");
}
if (blackbox_module)
{
if (ast->attributes.count("\\whitebox")) {