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shell: 'set' for defining globals 

Currently stateful, but still good for things.
This commit is contained in:
Kartik K. Agaram 2021-04-06 10:00:23 -07:00
parent 26a1849895
commit 7032a92cf2
2 changed files with 62 additions and 0 deletions
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47
shell/evaluate.mu
View File

@ -88,6 +88,53 @@ fn evaluate _in: (addr handle cell), out: (addr handle cell), env-h: (handle cel
trace-higher trace
return
}
$evaluate:set: {
# trees starting with "set" define globals
var expr/esi: (addr cell) <- copy in-addr
# if its first elem is not "set", break
var first-ah/ecx: (addr handle cell) <- get in-addr, left
var rest-ah/edx: (addr handle cell) <- get in-addr, right
var first/eax: (addr cell) <- lookup *first-ah
var first-type/ecx: (addr int) <- get first, type
compare *first-type, 2/symbol
break-if-!=
var sym-data-ah/eax: (addr handle stream byte) <- get first, text-data
var sym-data/eax: (addr stream byte) <- lookup *sym-data-ah
var set?/eax: boolean <- stream-data-equal? sym-data, "set"
compare set?, 0/false
break-if-=
#
trace-text trace, "eval", "set"
trace-text trace, "eval", "evaluating second arg"
var rest/eax: (addr cell) <- lookup *rest-ah
var first-arg-ah/ecx: (addr handle cell) <- get rest, left
{
var first-arg/eax: (addr cell) <- lookup *first-arg-ah
var first-arg-type/eax: (addr int) <- get first-arg, type
compare *first-arg-type, 2/symbol
break-if-=
error trace, "first arg to set must be a symbol"
trace-higher trace
return
}
rest-ah <- get rest, right
rest <- lookup *rest-ah
var second-arg-ah/edx: (addr handle cell) <- get rest, left
evaluate second-arg-ah, out, env-h, globals, trace
trace-text trace, "eval", "saving global binding"
var first-arg/eax: (addr cell) <- lookup *first-arg-ah
var first-arg-data-ah/eax: (addr handle stream byte) <- get first-arg, text-data
var first-arg-data/eax: (addr stream byte) <- lookup *first-arg-data-ah
var tmp-string: (handle array byte)
var tmp-ah/edx: (addr handle array byte) <- address tmp-string
rewind-stream first-arg-data
stream-to-array first-arg-data, tmp-ah
var first-arg-data-string/eax: (addr array byte) <- lookup *tmp-ah
var out2/edi: (addr handle cell) <- copy out
append-global globals, first-arg-data-string, *out2
trace-higher trace
return
}
trace-text trace, "eval", "function call"
trace-text trace, "eval", "evaluating list elements"
var evaluated-list-storage: (handle cell)

15
shell/global.mu
View File

@ -37,6 +37,21 @@ fn append-primitive _self: (addr global-table), name: (addr array byte) {
new-primitive-function curr-value-ah, curr-index
}
fn append-global _self: (addr global-table), name: (addr array byte), value: (handle cell) {
var self/esi: (addr global-table) <- copy _self
var final-index-addr/ecx: (addr int) <- get self, final-index
increment *final-index-addr
var curr-index/ecx: int <- copy *final-index-addr
var data-ah/eax: (addr handle array global) <- get self, data
var data/eax: (addr array global) <- lookup *data-ah
var curr-offset/esi: (offset global) <- compute-offset data, curr-index
var curr/esi: (addr global) <- index data, curr-offset
var curr-name-ah/eax: (addr handle array byte) <- get curr, name
copy-array-object name, curr-name-ah
var curr-value-ah/eax: (addr handle cell) <- get curr, value
copy-handle value, curr-value-ah
}
fn lookup-symbol-in-globals _sym: (addr cell), out: (addr handle cell), _globals: (addr global-table), trace: (addr trace) {
var sym/eax: (addr cell) <- copy _sym
var sym-data-ah/eax: (addr handle stream byte) <- get sym, text-data