mem = Array{Int64,1}(size_mem)
primitives = Array{Function,1}()
+primNames = Array{ASCIIString,1}()
# Built-in variables
mem[codeWordAddr] = -length(primitives)
mem[HERE] += 1
+ push!(primNames, name)
+
return codeWordAddr
end
function defNewVar(name::AbstractString, initial::Int64; flags::Int64=0)
createHeader(name, flags)
+ codeWordAddr = mem[HERE]
varAddr = mem[HERE] + 1
push!(primitives, eval(:(() -> begin
pushPS($(varAddr))
mem[mem[HERE]] = initial; mem[HERE] += 1
- return varAddr
+ return varAddr, codeWordAddr
end
function defConst(name::AbstractString, val::Int64; flags::Int64=0)
# Built-in variables
-defExistingVar("HERE", HERE)
-defExistingVar("LATEST", LATEST)
-defExistingVar("PSP0", PSP0)
-defExistingVar("RSP0", RSP0)
-STATE = defNewVar("STATE", 0)
-BASE = defNewVar("BASE", 10)
+HERE_CFA = defExistingVar("HERE", HERE)
+LATEST_CFA = defExistingVar("LATEST", LATEST)
+PSP0_CFA = defExistingVar("PSP0", PSP0)
+RSP0_CFA = defExistingVar("RSP0", RSP0)
+STATE, STATE_CFA = defNewVar("STATE", 0)
+BASE, BASE_CFA = defNewVar("BASE", 10)
# Constants
# I/O
defConst("TIB", TIB)
-NUMTIB = defNewVar("#TIB", 0)
-TOIN = defNewVar(">IN", 0)
+NUMTIB, NUMTIB_CFA = defNewVar("#TIB", 0)
+TOIN, TOIN_CFA = defNewVar(">IN", 0)
KEY = defPrim("KEY", () -> begin
if mem[TOIN] >= mem[NUMTIB]
wordAddr = mem[HERE]
offset = 0
+ if c == '\n'
+ # Treat newline as a special word
+
+ mem[wordAddr + offset] = Int64(c)
+ pushPS(wordAddr)
+ pushPS(1)
+ return mem[NEXT]
+ end
+
while true
mem[wordAddr + offset] = Int64(c)
offset += 1
c = Char(popPS())
if c == ' ' || c == '\t' || c == '\n'
+ # Rewind KEY
+ mem[TOIN] -= 1
break
end
end
wordLen = popPS()
wordAddr = popPS()
- word = getString(wordAddr, wordLen)
+ word = lowercase(getString(wordAddr, wordLen))
latest = LATEST
end
thisAddr = latest+2
- thisWord = getString(thisAddr, len)
+ thisWord = lowercase(getString(thisAddr, len))
- if thisWord == word
+ if lowercase(thisWord) == lowercase(word)
break
end
end
return mem[NEXT]
end)
+TELL = defPrim("TELL", () -> begin
+ len = popPS()
+ addr = popPS()
+ str = getString(addr, len)
+ print(str)
+ return mem[NEXT]
+end)
+
+# Outer interpreter
+
+INTERPRET = defPrim("INTERPRET", () -> begin
+
+ callPrim(mem[WORD])
+
+ wordName = getString(mem[reg.PSP-1], mem[reg.PSP])
+ println("... ", replace(wordName, "\n", "\\n"), " ...")
+
+ callPrim(mem[TWODUP])
+ callPrim(mem[FIND])
+
+ wordAddr = mem[reg.PSP]
+
+
+ if wordAddr>0
+ # Word in dictionary
+
+ isImmediate = (mem[wordAddr+1] & F_IMMED) != 0
+ callPrim(mem[TOCFA])
+
+ callPrim(mem[ROT]) # get rid of extra copy of word string details
+ popPS()
+ popPS()
+
+ if mem[STATE] == 0 || isImmediate
+ # Execute!
+ return mem[popPS()]
+ else
+ # Append CFA to dictionary
+ callPrim(mem[COMMA])
+ end
+ else
+ # Not in dictionary, assume number
+
+ popPS()
+
+ callPrim(mem[NUMBER])
+
+ if popPS() != 0
+ println("Parse error at word: '$wordName'")
+ return mem[NEXT]
+ else
+ end
+
+ if mem[STATE] == 0
+ # Number already on stack!
+ else
+ # Append literal to dictionary
+ pushPS(LIT)
+ callPrim(mem[COMMA])
+ callPrim(mem[COMMA])
+ end
+ end
+
+ return mem[NEXT]
+end)
+
+QUIT = defWord("QUIT",
+ [RSP0_CFA, RSPSTORE,
+ INTERPRET,
+ BRANCH,-2])
+
+NL = defPrim("\n", () -> begin
+ if mem[STATE] == 0
+ println(" ok")
+ end
+ return mem[NEXT]
+end)
+
+# Odds and Ends
+
+CHAR = defPrim("CHAR", () -> begin
+ callPrim(mem[WORD])
+ wordLen = popPS()
+ wordAddr = popPS()
+ word = getString(wordAddr, wordLen)
+ pushPS(Int64(word[1]))
+
+ return mem[NEXT]
+end)
+
+EXECUTE = defPrim("EXECUTE", () -> begin
+ return mem[popPS()]
+end)
+
+BYE = defPrim("BYE", () -> begin
+ return 0
+end)
+
#### VM loop ####
function runVM()
+ # Start with IP pointing to first instruction of outer interpreter
+ reg.IP = QUIT + 1
+
+ # Primitive processing loop.
+ # Everyting else is simply a consequence of this loop!
jmp = mem[NEXT]
- while (jmp = callPrim(jmp)) != 0 end
+ while (jmp = callPrim(jmp)) != 0
+ println("Evaluating prim $jmp [$(primNames[-jmp])]")
+ end
end
# Debugging tools
function dump(startAddr::Int64; count::Int64 = 100, cellsPerLine::Int64 = 10)
chars = Array{Char,1}(cellsPerLine)
- for i in 0:(count-1)
- addr = startAddr + i
- if i%cellsPerLine == 0
- print("$addr:")
- end
-
- print("\t$(mem[addr]) ")
+ lineStartAddr = cellsPerLine*div((startAddr-1),cellsPerLine) + 1
+ endAddr = startAddr + count - 1
+
+ q, r = divrem((endAddr-lineStartAddr+1), cellsPerLine)
+ numLines = q + (r > 0 ? 1 : 0)
+
+ i = lineStartAddr
+ for l in 1:numLines
+ print(i,":")
+
+ for c in 1:cellsPerLine
+ if i >= startAddr && i <= endAddr
+ print("\t",mem[i])
+ if mem[i]>=32 && mem[i]<128
+ chars[c] = Char(mem[i])
+ else
+ chars[c] = '.'
+ end
+ else
+ print("\t")
+ chars[c] = ' '
+ end
- if (mem[addr]>=32 && mem[addr]<128)
- chars[i%cellsPerLine + 1] = Char(mem[addr])
- else
- chars[i%cellsPerLine + 1] = '.'
+ i += 1
end
- if i%cellsPerLine == cellsPerLine-1
- println(string("\t", ASCIIString(chars)))
- end
+ println("\t", ASCIIString(chars))
end
end