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cxxrtl: expose port direction in debug information.

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This can be useful to distinguish e.g. a combinatorially driven wire
with type `CXXRTL_VALUE` from a module input with the same type, as
well as general introspection.
This commit is contained in:
whitequark 2020-09-02 15:18:44 +00:00
parent 8d6e5c6391
commit b025ee0aa6
3 changed files with 51 additions and 5 deletions
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25
backends/cxxrtl/cxxrtl_capi.h
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@ -112,6 +112,28 @@ enum cxxrtl_type {
// More object types may be added in the future, but the existing ones will never change.
};
// Flags of a simulated object.
enum cxxrtl_flag {
// Node is a module input port.
//
// This flag can be set on objects of type `CXXRTL_VALUE` and `CXXRTL_WIRE`. It may be combined
// with `CXXRTL_OUTPUT`, as well as other flags.
CXXRTL_INPUT = 1 << 0,
// Node is a module output port.
//
// This flag can be set on objects of type `CXXRTL_WIRE`. It may be combined with `CXXRTL_INPUT`,
// as well as other flags.
CXXRTL_OUTPUT = 1 << 1,
// Node is a module inout port.
//
// This flag can be set on objects of type `CXXRTL_WIRE`. It may be combined with other flags.
CXXRTL_INOUT = (CXXRTL_INPUT|CXXRTL_OUTPUT),
// More object flags may be added in the future, but the existing ones will never change.
};
// Description of a simulated object.
//
// The `data` array can be accessed directly to inspect and, if applicable, modify the bits
@ -123,6 +145,9 @@ struct cxxrtl_object {
// determines all other properties of the object.
uint32_t type; // actually `enum cxxrtl_type`
// Flags of the object.
uint32_t flags; // actually bit mask of `enum cxxrtl_flags`
// Width of the object in bits.
size_t width;