# Built-in variables
nextVarAddr = 1
-HERE = nextVarAddr; nextVarAddr += 1
+H = nextVarAddr; nextVarAddr += 1
LATEST = nextVarAddr; nextVarAddr += 1
RSP0 = nextVarAddr # bottom of RS
PSP0 = RSP0 + size_RS # bottom of PS
TIB = PSP0 + size_PS # address of terminal input buffer
-mem[HERE] = TIB + size_TIB # location of bottom of dictionary
+mem[H] = TIB + size_TIB # location of bottom of dictionary
mem[LATEST] = 0 # no previous definition
-DICT = mem[HERE] # Save bottom of dictionary as constant
+DICT = mem[H] # Save bottom of dictionary as constant
# VM registers
type Reg
F_LENMASK = 127
function createHeader(name::AbstractString, flags::Int64)
- mem[mem[HERE]] = mem[LATEST]
- mem[LATEST] = mem[HERE]
- mem[HERE] += 1
+ mem[mem[H]] = mem[LATEST]
+ mem[LATEST] = mem[H]
+ mem[H] += 1
- mem[mem[HERE]] = length(name) | flags; mem[HERE] += 1
- putString(name, mem[HERE]); mem[HERE] += length(name)
+ mem[mem[H]] = length(name) | flags; mem[H] += 1
+ putString(name, mem[H]); mem[H] += length(name)
end
function defPrimWord(name::AbstractString, f::Function; flags::Int64=0)
createHeader(name, flags)
- codeWordAddr = mem[HERE]
+ codeWordAddr = mem[H]
mem[codeWordAddr] = defPrim(f, name=name)
- mem[HERE] += 1
+ mem[H] += 1
return codeWordAddr
end
function defWord(name::AbstractString, wordAddrs::Array{Int64,1}; flags::Int64=0)
createHeader(name, flags)
- addr = mem[HERE]
- mem[mem[HERE]] = DOCOL
- mem[HERE] += 1
+ addr = mem[H]
+ mem[mem[H]] = DOCOL
+ mem[H] += 1
for wordAddr in wordAddrs
- mem[mem[HERE]] = wordAddr
- mem[HERE] += 1
+ mem[mem[H]] = wordAddr
+ mem[H] += 1
end
return addr
function defNewVar(name::AbstractString, initial::Int64; flags::Int64=0)
createHeader(name, flags)
- codeWordAddr = mem[HERE]
- varAddr = mem[HERE] + 1
+ codeWordAddr = mem[H]
+ varAddr = mem[H] + 1
- mem[mem[HERE]] = DOVAR; mem[HERE] += 1
- mem[mem[HERE]] = initial; mem[HERE] += 1
+ mem[mem[H]] = DOVAR; mem[H] += 1
+ mem[mem[H]] = initial; mem[H] += 1
return varAddr, codeWordAddr
end
function defConst(name::AbstractString, val::Int64; flags::Int64=0)
createHeader(name, flags)
- codeWordAddr = mem[HERE]
+ codeWordAddr = mem[H]
- mem[mem[HERE]] = DOCON; mem[HERE] += 1
- mem[mem[HERE]] = val; mem[HERE] += 1
+ mem[mem[H]] = DOCON; mem[H] += 1
+ mem[mem[H]] = val; mem[H] += 1
return codeWordAddr
end
# Dictionary entries for core built-in variables, constants
-HERE_CFA = defExistingVar("HERE", HERE)
+H_CFA = defExistingVar("H", H)
LATEST_CFA = defExistingVar("LATEST", LATEST)
PSP0_CFA = defConst("PSP0", PSP0)
# Dictionary searches
+TOCFA = defPrimWord(">CFA", () -> begin
+
+ addr = popPS()
+ lenAndFlags = mem[addr+1]
+ len = lenAndFlags & F_LENMASK
+
+ pushPS(addr + 2 + len)
+
+ return NEXT
+end)
+
+TOBODY = defWord(">BODY", [INCR, EXIT])
+
FIND = defPrimWord("FIND", () -> begin
countedAddr = popPS()
end
end
- pushPS(latest)
-
- return NEXT
-end)
-
-TOCFA = defPrimWord(">CFA", () -> begin
-
- addr = popPS()
- lenAndFlags = mem[addr+1]
- len = lenAndFlags & F_LENMASK
+ if latest > 0
+ pushPS(latest)
+ callPrim(mem[TOCFA])
+ if (lenAndFlags & F_IMMED) == F_IMMED
+ pushPS(1)
+ else
+ pushPS(-1)
+ end
+ else
+ pushPS(countedAddr)
+ pushPS(0)
+ end
- pushPS(addr + 2 + len)
return NEXT
end)
-TOPFA = defWord(">PFA", [TOCFA, INCR, EXIT])
# Branching
end)
COMMA = defPrimWord(",", () -> begin
- mem[mem[HERE]] = popPS()
- mem[HERE] += 1
+ mem[mem[H]] = popPS()
+ mem[H] += 1
return NEXT
end)
mem[TOIN] += 1
end
- countAddr = mem[HERE]
- addr = mem[HERE]+1
+ countAddr = mem[H]
+ addr = mem[H]+1
# Start reading in word
count = 0
delim = popPS()
# Chew up initial occurrences of delim
- addr = mem[HERE]
+ addr = mem[H]
# Start reading input stream
count = 0
# Compilation
+HERE = defWord("HERE",
+ [H_CFA, FETCH, EXIT])
+
HEADER = defPrimWord("HEADER", () -> begin
wordAddr = popPS()+1
wordLen = mem[wordAddr-1]
return NEXT
end)
+CREATE = defWord("CREATE",
+ [LIT, 32, WORD, HEADER,
+ LIT, DOVAR, COMMA,
+ EXIT])
+
+DODOES = defPrim(() -> begin
+ pushRS(reg.IP)
+ reg.IP = popPS()
+ pushPS(reg.W + 1)
+ return NEXT
+end, name="DODOES")
+
+DOES_HELPER = defPrimWord("(DOES>)", () -> begin
+
+ pushPS(mem[LATEST])
+ callPrim(mem[TOCFA])
+ cfa = popPS()
+
+ runtimeAddr = popPS()
+
+ mem[cfa] = defPrim(eval(:(() -> begin
+ pushPS($(runtimeAddr))
+ return DODOES
+ end)), name="doesPrim")
+
+ return NEXT
+end, flags=F_IMMED)
+
+DOES = defWord("DOES>",
+ [BTICK, LIT, COMMA, HERE, LIT, 3, ADD, COMMA,
+ BTICK, DOES_HELPER, COMMA, BTICK, EXIT, COMMA, EXIT],
+ flags=F_IMMED)
+
LBRAC = defPrimWord("[", () -> begin
mem[STATE] = 0
return NEXT