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Merge pull request #1918 from whitequark/simplify-improve_enum

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ast/simplify: improve enum handling
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whitequark 2020-04-15 14:16:50 +00:00 committed by GitHub
parent 43cc6bd8a1 2106f78bb1
commit 2d436bc4f1
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2 changed files with 5 additions and 7 deletions
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4
README.md
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@ -443,8 +443,8 @@ Verilog Attributes and non-standard features
- The ``wiretype`` attribute is added by the verilog parser for wires of a - The ``wiretype`` attribute is added by the verilog parser for wires of a
typedef'd type to indicate the type identifier. typedef'd type to indicate the type identifier.
- Various ``enum_{width}_{value}`` attributes are added to wires of an - Various ``enum_value_{value}`` attributes are added to wires of an enumerated type
enumerated type to give a map of possible enum items to their values. to give a map of possible enum items to their values.
- The ``enum_base_type`` attribute is added to enum items to indicate which - The ``enum_base_type`` attribute is added to enum items to indicate which
enum they belong to (enums -- anonymous and otherwise -- are enum they belong to (enums -- anonymous and otherwise -- are

8
frontends/ast/simplify.cc
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@ -931,9 +931,7 @@ bool AstNode::simplify(bool const_fold, bool at_zero, bool in_lvalue, int stage,
); );
} }
//start building attribute string //start building attribute string
std::string enum_item_str = "\\enum_"; std::string enum_item_str = "\\enum_value_";
enum_item_str.append(std::to_string(width));
enum_item_str.append("_");
//get enum item value //get enum item value
if(enum_item->children[0]->type != AST_CONSTANT){ if(enum_item->children[0]->type != AST_CONSTANT){
log_error("expected const, got %s for %s (%s)\n", log_error("expected const, got %s for %s (%s)\n",
@ -941,8 +939,8 @@ bool AstNode::simplify(bool const_fold, bool at_zero, bool in_lvalue, int stage,
enum_item->str.c_str(), enum_node->str.c_str() enum_item->str.c_str(), enum_node->str.c_str()
); );
} }
int val = enum_item->children[0]->asInt(is_signed); RTLIL::Const val = enum_item->children[0]->bitsAsConst(width, is_signed);
enum_item_str.append(std::to_string(val)); enum_item_str.append(val.as_string());
//set attribute for available val to enum item name mappings //set attribute for available val to enum item name mappings
attributes[enum_item_str.c_str()] = mkconst_str(enum_item->str); attributes[enum_item_str.c_str()] = mkconst_str(enum_item->str);
} }