Cheri-research/cheri-cap-lib
1
0
Fork 0
Code Issues 1 Pull Requests Actions Packages Projects Releases Wiki Activity

Workaround for default typeclass function definitions

Browse Source
This commit is contained in:
Peter Rugg
2020-04-23 15:44:25 +01:00
parent 80ba19db9f
commit a5f3c776c7
2 changed files with 11 additions and 8 deletions
Download Patch File Download Diff File Expand all files Collapse all files

13
CHERICap.bsv
View File

@@ -170,10 +170,13 @@ typeclass CHERICap#(type t, numeric type ot, numeric type flg, numeric type n, n
// Returns a null cap with an address set to the argument
function t nullWithAddr (Bit#(n) addr);
// Workaround to allow null cap to be derived in default implementations
function t nullCapFromDummy(t dummy);
// Return the maximally permissive capability (initial register state)
function t almightyCap;
// Return the null capability
function t nullCap;
function t nullCap = nullCapFromDummy(?);
// Check if a type is valid
function Bool validAsType (t dummy, Bit#(n) checkType);
@@ -196,12 +199,12 @@ typeclass CHERICap#(type t, numeric type ot, numeric type flg, numeric type n, n
// TODO the following do not compile due to "not enough explicit type information"
// Get representable alignment mask
// function Bit#(n) getRepresentableAlignmentMask (t dummy, Bit#(n) length_request) =
// setBoundsCombined(nullCap, length_request).mask;
function Bit#(n) getRepresentableAlignmentMask (t dummy, Bit#(n) length_request) =
setBoundsCombined(nullCapFromDummy(dummy), length_request).mask;
// Get representable length
// function Bit#(n) getRepresentableLength (t dummy, Bit#(n) length_request) =
// setBoundsCombined(nullCap, length_request).length;
function Bit#(n) getRepresentableLength (t dummy, Bit#(n) length_request) =
setBoundsCombined(nullCapFromDummy(dummy), length_request).length;
// Assert that the encoding is valid
function Bool isDerivable (t cap);