642 lines
22 KiB
Forth
642 lines
22 KiB
Forth
# widgets in the environment share the following pattern of updates:
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# process-* functions read keys and update which object the cursor is at
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# render-* functions print to screen and update which row/col each object's cursor is at
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type sandbox {
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setup: (handle line)
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data: (handle line)
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# bookkeeping for process-*
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cursor-call-path: (handle call-path-element)
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expanded-words: (handle call-path)
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partial-name-for-cursor-word: (handle word) # only when renaming word
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partial-name-for-function: (handle word) # only when defining function
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# bookkeeping for render-*
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cursor-row: int
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cursor-col: int
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#
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next: (handle sandbox)
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prev: (handle sandbox)
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}
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type function {
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name: (handle array byte)
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args: (handle word) # in reverse order
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body: (handle line)
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# bookkeeping for process-*
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cursor-word: (handle word)
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# bookkeeping for render-*
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cursor-row: int
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cursor-col: int
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# todo: some sort of indication of spatial location
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next: (handle function)
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}
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type line {
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name: (handle array byte)
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data: (handle word)
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result: (handle result) # might be cached
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next: (handle line)
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prev: (handle line)
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}
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type word {
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scalar-data: (handle gap-buffer)
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next: (handle word)
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prev: (handle word)
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}
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# todo: turn this into a sum type
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type value {
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type: int
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number-data: float # if type = 0
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text-data: (handle array byte) # if type = 1
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array-data: (handle array value) # if type = 2
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file-data: (handle buffered-file) # if type = 3
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filename: (handle array byte) # if type = 3
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screen-data: (handle screen) # if type = 4
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}
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type table {
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data: (handle array bind)
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next: (handle table)
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}
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type bind {
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key: (handle array byte)
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value: (handle value) # I'd inline this but we sometimes want to return a specific value from a table
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}
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# A call-path is a data structure that can unambiguously refer to any specific
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# call arbitrarily deep inside the call hierarchy of a program.
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type call-path {
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data: (handle call-path-element)
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next: (handle call-path)
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}
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# A call-path element is a list of elements, each of which corresponds to some call.
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type call-path-element {
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word: (handle word)
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next: (handle call-path-element)
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}
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type result {
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data: value-stack
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error: (handle array byte) # single error message for now
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}
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fn initialize-sandbox _sandbox: (addr sandbox) {
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var sandbox/esi: (addr sandbox) <- copy _sandbox
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var line-ah/eax: (addr handle line) <- get sandbox, data
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allocate line-ah
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var line/eax: (addr line) <- lookup *line-ah
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initialize-line line
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var word-ah/ecx: (addr handle word) <- get line, data
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var cursor-call-path-ah/eax: (addr handle call-path-element) <- get sandbox, cursor-call-path
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allocate cursor-call-path-ah
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var cursor-call-path/eax: (addr call-path-element) <- lookup *cursor-call-path-ah
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var dest/eax: (addr handle word) <- get cursor-call-path, word
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copy-object word-ah, dest
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}
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# initialize line with a single empty word
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fn initialize-line _line: (addr line) {
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var line/esi: (addr line) <- copy _line
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var word-ah/eax: (addr handle word) <- get line, data
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allocate word-ah
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var word/eax: (addr word) <- lookup *word-ah
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initialize-word word
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}
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fn create-primitive-functions _self: (addr handle function) {
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# x 2* = x 2 *
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var self/esi: (addr handle function) <- copy _self
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allocate self
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var _f/eax: (addr function) <- lookup *self
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var f/esi: (addr function) <- copy _f
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var name-ah/eax: (addr handle array byte) <- get f, name
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populate-text-with name-ah, "2*"
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var args-ah/eax: (addr handle word) <- get f, args
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allocate args-ah
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var args/eax: (addr word) <- lookup *args-ah
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initialize-word-with args, "x"
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var body-ah/eax: (addr handle line) <- get f, body
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allocate body-ah
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var body/eax: (addr line) <- lookup *body-ah
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initialize-line body
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var curr-word-ah/ecx: (addr handle word) <- get body, data
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parse-words "x 2 *", curr-word-ah
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var cursor-word-ah/edx: (addr handle word) <- get f, cursor-word
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copy-object curr-word-ah, cursor-word-ah
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# x 1+ = x 1 +
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var next/esi: (addr handle function) <- get f, next
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allocate next
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var _f/eax: (addr function) <- lookup *next
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var f/esi: (addr function) <- copy _f
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var name-ah/eax: (addr handle array byte) <- get f, name
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populate-text-with name-ah, "1+"
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var args-ah/eax: (addr handle word) <- get f, args
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allocate args-ah
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var args/eax: (addr word) <- lookup *args-ah
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initialize-word-with args, "x"
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var body-ah/eax: (addr handle line) <- get f, body
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allocate body-ah
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var body/eax: (addr line) <- lookup *body-ah
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initialize-line body
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curr-word-ah <- get body, data
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parse-words "x 1 +", curr-word-ah
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var cursor-word-ah/edx: (addr handle word) <- get f, cursor-word
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copy-object curr-word-ah, cursor-word-ah
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# x 2+ = x 1+ 1+
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var next/esi: (addr handle function) <- get f, next
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allocate next
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var _f/eax: (addr function) <- lookup *next
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var f/esi: (addr function) <- copy _f
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var name-ah/eax: (addr handle array byte) <- get f, name
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populate-text-with name-ah, "2+"
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var args-ah/eax: (addr handle word) <- get f, args
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allocate args-ah
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var args/eax: (addr word) <- lookup *args-ah
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initialize-word-with args, "x"
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var body-ah/eax: (addr handle line) <- get f, body
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allocate body-ah
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var body/eax: (addr line) <- lookup *body-ah
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initialize-line body
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curr-word-ah <- get body, data
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parse-words "x 1+ 1+", curr-word-ah
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var cursor-word-ah/edx: (addr handle word) <- get f, cursor-word
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copy-object curr-word-ah, cursor-word-ah
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# x square = x x *
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var next/esi: (addr handle function) <- get f, next
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allocate next
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var _f/eax: (addr function) <- lookup *next
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var f/esi: (addr function) <- copy _f
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var name-ah/eax: (addr handle array byte) <- get f, name
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populate-text-with name-ah, "square"
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var args-ah/eax: (addr handle word) <- get f, args
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allocate args-ah
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var args/eax: (addr word) <- lookup *args-ah
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initialize-word-with args, "x"
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var body-ah/eax: (addr handle line) <- get f, body
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allocate body-ah
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var body/eax: (addr line) <- lookup *body-ah
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initialize-line body
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curr-word-ah <- get body, data
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parse-words "x x *", curr-word-ah
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var cursor-word-ah/edx: (addr handle word) <- get f, cursor-word
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copy-object curr-word-ah, cursor-word-ah
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# x 1- = x 1 -
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var next/esi: (addr handle function) <- get f, next
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allocate next
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var _f/eax: (addr function) <- lookup *next
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var f/esi: (addr function) <- copy _f
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var name-ah/eax: (addr handle array byte) <- get f, name
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populate-text-with name-ah, "1-"
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var args-ah/eax: (addr handle word) <- get f, args
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allocate args-ah
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var args/eax: (addr word) <- lookup *args-ah
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initialize-word-with args, "x"
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var body-ah/eax: (addr handle line) <- get f, body
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allocate body-ah
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var body/eax: (addr line) <- lookup *body-ah
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initialize-line body
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curr-word-ah <- get body, data
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parse-words "x 1 -", curr-word-ah
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var cursor-word-ah/edx: (addr handle word) <- get f, cursor-word
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copy-object curr-word-ah, cursor-word-ah
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# x y sub = x y -
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var next/esi: (addr handle function) <- get f, next
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allocate next
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var _f/eax: (addr function) <- lookup *next
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var f/esi: (addr function) <- copy _f
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var name-ah/eax: (addr handle array byte) <- get f, name
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populate-text-with name-ah, "sub"
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# critical lesson: args are stored in reverse order
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var args-ah/eax: (addr handle word) <- get f, args
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allocate args-ah
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var args/eax: (addr word) <- lookup *args-ah
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initialize-word-with args, "y"
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var next-arg-ah/eax: (addr handle word) <- get args, next
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allocate next-arg-ah
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var next-arg/eax: (addr word) <- lookup *next-arg-ah
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initialize-word-with next-arg, "x"
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var body-ah/eax: (addr handle line) <- get f, body
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allocate body-ah
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var body/eax: (addr line) <- lookup *body-ah
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initialize-line body
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curr-word-ah <- get body, data
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parse-words "x y -", curr-word-ah
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var cursor-word-ah/edx: (addr handle word) <- get f, cursor-word
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copy-object curr-word-ah, cursor-word-ah
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}
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fn function-body functions: (addr handle function), _word: (addr handle word), out: (addr handle line) {
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var function-name-storage: (handle array byte)
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var function-name-ah/ecx: (addr handle array byte) <- address function-name-storage
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var word-ah/esi: (addr handle word) <- copy _word
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var word/eax: (addr word) <- lookup *word-ah
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var gap-ah/eax: (addr handle gap-buffer) <- get word, scalar-data
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var gap/eax: (addr gap-buffer) <- lookup *gap-ah
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gap-buffer-to-string gap, function-name-ah
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var _function-name/eax: (addr array byte) <- lookup *function-name-ah
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var function-name/esi: (addr array byte) <- copy _function-name
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var curr-ah/ecx: (addr handle function) <- copy functions
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$function-body:loop: {
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var _curr/eax: (addr function) <- lookup *curr-ah
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var curr/edx: (addr function) <- copy _curr
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compare curr, 0
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break-if-=
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var curr-name-ah/eax: (addr handle array byte) <- get curr, name
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var curr-name/eax: (addr array byte) <- lookup *curr-name-ah
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var found?/eax: boolean <- string-equal? curr-name, function-name
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compare found?, 0/false
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{
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break-if-=
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var src/eax: (addr handle line) <- get curr, body
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copy-object src, out
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break $function-body:loop
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}
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curr-ah <- get curr, next
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loop
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}
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}
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fn body-length functions: (addr handle function), function-name: (addr handle word) -> _/eax: int {
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var body-storage: (handle line)
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var body-ah/edi: (addr handle line) <- address body-storage
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function-body functions, function-name, body-ah
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var body/eax: (addr line) <- lookup *body-ah
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var result/eax: int <- num-words-in-line body
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return result
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}
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fn num-words-in-line _in: (addr line) -> _/eax: int {
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var in/esi: (addr line) <- copy _in
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var curr-ah/ecx: (addr handle word) <- get in, data
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var result/edi: int <- copy 0
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{
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var curr/eax: (addr word) <- lookup *curr-ah
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compare curr, 0
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break-if-=
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curr-ah <- get curr, next
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result <- increment
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loop
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}
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return result
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}
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fn populate-text-with _out: (addr handle array byte), _in: (addr array byte) {
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var in/esi: (addr array byte) <- copy _in
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var n/ecx: int <- length in
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var out/edx: (addr handle array byte) <- copy _out
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populate out, n
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var _out-addr/eax: (addr array byte) <- lookup *out
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var out-addr/edx: (addr array byte) <- copy _out-addr
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var i/eax: int <- copy 0
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{
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compare i, n
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break-if->=
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var src/esi: (addr byte) <- index in, i
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var val/ecx: byte <- copy-byte *src
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var dest/edi: (addr byte) <- index out-addr, i
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copy-byte-to *dest, val
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i <- increment
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loop
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}
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}
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fn initialize-path-from-sandbox _in: (addr sandbox), _out: (addr handle call-path-element) {
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var sandbox/esi: (addr sandbox) <- copy _in
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var line-ah/eax: (addr handle line) <- get sandbox, data
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var line/eax: (addr line) <- lookup *line-ah
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var src/esi: (addr handle word) <- get line, data
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var out-ah/edi: (addr handle call-path-element) <- copy _out
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var out/eax: (addr call-path-element) <- lookup *out-ah
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var dest/edi: (addr handle word) <- get out, word
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copy-object src, dest
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}
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fn initialize-path-from-line _line: (addr line), _out: (addr handle call-path-element) {
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var line/eax: (addr line) <- copy _line
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var src/esi: (addr handle word) <- get line, data
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var out-ah/edi: (addr handle call-path-element) <- copy _out
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var out/eax: (addr call-path-element) <- lookup *out-ah
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var dest/edi: (addr handle word) <- get out, word
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copy-object src, dest
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}
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fn find-in-call-paths call-paths: (addr handle call-path), needle: (addr handle call-path-element) -> _/eax: boolean {
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var curr-ah/esi: (addr handle call-path) <- copy call-paths
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$find-in-call-path:loop: {
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var curr/eax: (addr call-path) <- lookup *curr-ah
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compare curr, 0
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break-if-=
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{
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var curr-data/eax: (addr handle call-path-element) <- get curr, data
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var match?/eax: boolean <- call-path-element-match? curr-data, needle
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compare match?, 0/false
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{
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break-if-=
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return 1/true
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}
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}
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curr-ah <- get curr, next
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loop
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}
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return 0/false
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}
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fn call-path-element-match? _x: (addr handle call-path-element), _y: (addr handle call-path-element) -> _/eax: boolean {
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var x-ah/eax: (addr handle call-path-element) <- copy _x
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var x-a/eax: (addr call-path-element) <- lookup *x-ah
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var x/esi: (addr call-path-element) <- copy x-a
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var y-ah/eax: (addr handle call-path-element) <- copy _y
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var y-a/eax: (addr call-path-element) <- lookup *y-ah
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var y/edi: (addr call-path-element) <- copy y-a
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compare x, y
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{
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break-if-!=
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return 1/true
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}
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compare x, 0
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{
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break-if-!=
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return 0/false
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}
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compare y, 0
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{
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break-if-!=
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return 0/false
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}
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# compare word addresses, not contents
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var x-data-ah/ecx: (addr handle word) <- get x, word
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var x-data-a/eax: (addr word) <- lookup *x-data-ah
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var x-data/ecx: int <- copy x-data-a
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var y-data-ah/eax: (addr handle word) <- get y, word
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var y-data-a/eax: (addr word) <- lookup *y-data-ah
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var y-data/eax: int <- copy y-data-a
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#? print-string 0, "match? "
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#? print-int32-hex 0, x-data
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#? print-string 0, " vs "
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#? print-int32-hex 0, y-data
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#? print-string 0, "\n"
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compare x-data, y-data
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{
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break-if-=
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return 0/false
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}
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var x-next/ecx: (addr handle call-path-element) <- get x, next
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var y-next/eax: (addr handle call-path-element) <- get y, next
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var result/eax: boolean <- call-path-element-match? x-next, y-next
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return result
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}
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# order is irrelevant
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fn insert-in-call-path list: (addr handle call-path), new: (addr handle call-path-element) {
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var new-path-storage: (handle call-path)
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var new-path-ah/edi: (addr handle call-path) <- address new-path-storage
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allocate new-path-ah
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var new-path/eax: (addr call-path) <- lookup *new-path-ah
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var next/ecx: (addr handle call-path) <- get new-path, next
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copy-object list, next
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var dest/ecx: (addr handle call-path-element) <- get new-path, data
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deep-copy-call-path-element new, dest
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copy-object new-path-ah, list
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}
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# assumes dest is initially clear
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fn deep-copy-call-path-element _src: (addr handle call-path-element), _dest: (addr handle call-path-element) {
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var src/esi: (addr handle call-path-element) <- copy _src
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# if src is null, return
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var _src-addr/eax: (addr call-path-element) <- lookup *src
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compare _src-addr, 0
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break-if-=
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# allocate
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var src-addr/esi: (addr call-path-element) <- copy _src-addr
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var dest/eax: (addr handle call-path-element) <- copy _dest
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allocate dest
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# copy data
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var dest-addr/eax: (addr call-path-element) <- lookup *dest
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{
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var dest-data-addr/ecx: (addr handle word) <- get dest-addr, word
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var src-data-addr/eax: (addr handle word) <- get src-addr, word
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copy-object src-data-addr, dest-data-addr
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}
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# recurse
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var src-next/esi: (addr handle call-path-element) <- get src-addr, next
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var dest-next/eax: (addr handle call-path-element) <- get dest-addr, next
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deep-copy-call-path-element src-next, dest-next
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}
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fn delete-in-call-path list: (addr handle call-path), needle: (addr handle call-path-element) {
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var curr-ah/esi: (addr handle call-path) <- copy list
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$delete-in-call-path:loop: {
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var _curr/eax: (addr call-path) <- lookup *curr-ah
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var curr/ecx: (addr call-path) <- copy _curr
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compare curr, 0
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break-if-=
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{
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var curr-data/eax: (addr handle call-path-element) <- get curr, data
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var match?/eax: boolean <- call-path-element-match? curr-data, needle
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compare match?, 0/false
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{
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break-if-=
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var next-ah/ecx: (addr handle call-path) <- get curr, next
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copy-object next-ah, curr-ah
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loop $delete-in-call-path:loop
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}
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}
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curr-ah <- get curr, next
|
|
loop
|
|
}
|
|
}
|
|
|
|
fn increment-final-element list: (addr handle call-path-element) {
|
|
var final-ah/eax: (addr handle call-path-element) <- copy list
|
|
var final/eax: (addr call-path-element) <- lookup *final-ah
|
|
var val-ah/ecx: (addr handle word) <- get final, word
|
|
var val/eax: (addr word) <- lookup *val-ah
|
|
var new-ah/edx: (addr handle word) <- get val, next
|
|
var target/eax: (addr word) <- lookup *new-ah
|
|
compare target, 0
|
|
break-if-=
|
|
copy-object new-ah, val-ah
|
|
}
|
|
|
|
fn decrement-final-element list: (addr handle call-path-element) {
|
|
var final-ah/eax: (addr handle call-path-element) <- copy list
|
|
var final/eax: (addr call-path-element) <- lookup *final-ah
|
|
var val-ah/ecx: (addr handle word) <- get final, word
|
|
var val/eax: (addr word) <- lookup *val-ah
|
|
#? print-string 0, "replacing "
|
|
#? {
|
|
#? var foo/eax: int <- copy val
|
|
#? print-int32-hex 0, foo
|
|
#? }
|
|
var new-ah/edx: (addr handle word) <- get val, prev
|
|
var target/eax: (addr word) <- lookup *new-ah
|
|
compare target, 0
|
|
break-if-=
|
|
# val = val->prev
|
|
#? print-string 0, " with "
|
|
#? {
|
|
#? var foo/eax: int <- copy target
|
|
#? print-int32-hex 0, foo
|
|
#? }
|
|
#? print-string 0, "\n"
|
|
copy-object new-ah, val-ah
|
|
}
|
|
|
|
fn move-final-element-to-start-of-line list: (addr handle call-path-element) {
|
|
var final-ah/eax: (addr handle call-path-element) <- copy list
|
|
var final/eax: (addr call-path-element) <- lookup *final-ah
|
|
var val-ah/ecx: (addr handle word) <- get final, word
|
|
var val/eax: (addr word) <- lookup *val-ah
|
|
var new-ah/edx: (addr handle word) <- get val, prev
|
|
var target/eax: (addr word) <- lookup *new-ah
|
|
compare target, 0
|
|
break-if-=
|
|
copy-object new-ah, val-ah
|
|
move-final-element-to-start-of-line list
|
|
}
|
|
|
|
fn move-final-element-to-end-of-line list: (addr handle call-path-element) {
|
|
var final-ah/eax: (addr handle call-path-element) <- copy list
|
|
var final/eax: (addr call-path-element) <- lookup *final-ah
|
|
var val-ah/ecx: (addr handle word) <- get final, word
|
|
var val/eax: (addr word) <- lookup *val-ah
|
|
var new-ah/edx: (addr handle word) <- get val, next
|
|
var target/eax: (addr word) <- lookup *new-ah
|
|
compare target, 0
|
|
break-if-=
|
|
copy-object new-ah, val-ah
|
|
move-final-element-to-end-of-line list
|
|
}
|
|
|
|
fn push-to-call-path-element list: (addr handle call-path-element), new: (addr handle word) {
|
|
var new-element-storage: (handle call-path-element)
|
|
var new-element-ah/edi: (addr handle call-path-element) <- address new-element-storage
|
|
allocate new-element-ah
|
|
var new-element/eax: (addr call-path-element) <- lookup *new-element-ah
|
|
# save word
|
|
var dest/ecx: (addr handle word) <- get new-element, word
|
|
copy-object new, dest
|
|
# save next
|
|
var dest2/ecx: (addr handle call-path-element) <- get new-element, next
|
|
copy-object list, dest2
|
|
# return
|
|
copy-object new-element-ah, list
|
|
}
|
|
|
|
fn drop-from-call-path-element _list: (addr handle call-path-element) {
|
|
var list-ah/esi: (addr handle call-path-element) <- copy _list
|
|
var list/eax: (addr call-path-element) <- lookup *list-ah
|
|
var next/eax: (addr handle call-path-element) <- get list, next
|
|
copy-object next, _list
|
|
}
|
|
|
|
fn drop-nested-calls _list: (addr handle call-path-element) {
|
|
var list-ah/esi: (addr handle call-path-element) <- copy _list
|
|
var list/eax: (addr call-path-element) <- lookup *list-ah
|
|
var next-ah/edi: (addr handle call-path-element) <- get list, next
|
|
var next/eax: (addr call-path-element) <- lookup *next-ah
|
|
compare next, 0
|
|
break-if-=
|
|
copy-object next-ah, _list
|
|
drop-nested-calls _list
|
|
}
|
|
|
|
fn dump-call-path-element screen: (addr screen), _x-ah: (addr handle call-path-element) {
|
|
var x-ah/ecx: (addr handle call-path-element) <- copy _x-ah
|
|
var _x/eax: (addr call-path-element) <- lookup *x-ah
|
|
var x/esi: (addr call-path-element) <- copy _x
|
|
var word-ah/eax: (addr handle word) <- get x, word
|
|
var word/eax: (addr word) <- lookup *word-ah
|
|
print-word screen, word
|
|
var next-ah/ecx: (addr handle call-path-element) <- get x, next
|
|
var next/eax: (addr call-path-element) <- lookup *next-ah
|
|
compare next, 0
|
|
{
|
|
break-if-=
|
|
print-string screen, " "
|
|
dump-call-path-element screen, next-ah
|
|
return
|
|
}
|
|
print-string screen, "\n"
|
|
}
|
|
|
|
fn dump-call-paths screen: (addr screen), _x-ah: (addr handle call-path) {
|
|
var x-ah/ecx: (addr handle call-path) <- copy _x-ah
|
|
var x/eax: (addr call-path) <- lookup *x-ah
|
|
compare x, 0
|
|
break-if-=
|
|
var src/ecx: (addr handle call-path-element) <- get x, data
|
|
dump-call-path-element screen, src
|
|
var next-ah/ecx: (addr handle call-path) <- get x, next
|
|
var next/eax: (addr call-path) <- lookup *next-ah
|
|
compare next, 0
|
|
{
|
|
break-if-=
|
|
dump-call-paths screen, next-ah
|
|
}
|
|
}
|
|
|
|
fn function-width _self: (addr function) -> _/eax: int {
|
|
var self/esi: (addr function) <- copy _self
|
|
var args/ecx: (addr handle word) <- get self, args
|
|
var arg-width/eax: int <- word-list-length args
|
|
var result/edi: int <- copy arg-width
|
|
result <- add 4 # function-header-indent + body-indent
|
|
var body-ah/eax: (addr handle line) <- get self, body
|
|
var body-width/eax: int <- body-width body-ah
|
|
body-width <- add 1 # right margin
|
|
body-width <- add 2 # body-indent for "≡ "
|
|
compare result, body-width
|
|
{
|
|
break-if->=
|
|
result <- copy body-width
|
|
}
|
|
return result
|
|
}
|
|
|
|
fn body-width lines: (addr handle line) -> _/eax: int {
|
|
var curr-ah/esi: (addr handle line) <- copy lines
|
|
var result/edi: int <- copy 0
|
|
{
|
|
var curr/eax: (addr line) <- lookup *curr-ah
|
|
compare curr, 0
|
|
break-if-=
|
|
{
|
|
var words/ecx: (addr handle word) <- get curr, data
|
|
var curr-len/eax: int <- word-list-length words
|
|
compare curr-len, result
|
|
break-if-<=
|
|
result <- copy curr-len
|
|
}
|
|
curr-ah <- get curr, next
|
|
loop
|
|
}
|
|
return result
|
|
}
|
|
|
|
fn function-height _self: (addr function) -> _/eax: int {
|
|
var self/esi: (addr function) <- copy _self
|
|
var body-ah/eax: (addr handle line) <- get self, body
|
|
var result/eax: int <- line-list-length body-ah
|
|
result <- increment # for function header
|
|
return result
|
|
}
|
|
|
|
fn line-list-length lines: (addr handle line) -> _/eax: int {
|
|
var curr-ah/esi: (addr handle line) <- copy lines
|
|
var result/edi: int <- copy 0
|
|
{
|
|
var curr/eax: (addr line) <- lookup *curr-ah
|
|
compare curr, 0
|
|
break-if-=
|
|
curr-ah <- get curr, next
|
|
result <- increment
|
|
loop
|
|
}
|
|
return result
|
|
}
|