# Built-in variables
nextVarAddr = 1
-RSP0 = nextVarAddr; nextVarAddr += 1
-PSP0 = nextVarAddr; nextVarAddr += 1
-HERE = nextVarAddr; nextVarAddr += 1
+H = nextVarAddr; nextVarAddr += 1
LATEST = nextVarAddr; nextVarAddr += 1
-mem[RSP0] = nextVarAddr # bottom of RS
-mem[PSP0] = mem[RSP0] + size_RS # bottom of PS
-TIB = mem[PSP0] + size_PS # address of terminal input buffer
-mem[HERE] = TIB + size_TIB # location of bottom of dictionary
-mem[LATEST] = 0 # no previous definition
+RSP0 = nextVarAddr # bottom of RS
+PSP0 = RSP0 + size_RS # bottom of PS
+TIB = PSP0 + size_PS # address of terminal input buffer
+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
IP::Int64 # Instruction pointer
W::Int64 # Working register
end
-reg = Reg(mem[RSP0], mem[PSP0], 0, 0)
+reg = Reg(RSP0, PSP0, 0, 0)
# Stack manipulation functions
Base.showerror(io::IO, ex::ParamStackUnderflow) = print(io, "Parameter stack underflow.")
Base.showerror(io::IO, ex::ReturnStackUnderflow) = print(io, "Return stack underflow.")
-getRSDepth() = reg.RSP - mem[RSP0]
-getPSDepth() = reg.PSP - mem[PSP0]
+getRSDepth() = reg.RSP - RSP0
+getPSDepth() = reg.PSP - PSP0
function ensurePSDepth(depth::Int64)
if getPSDepth()<depth
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 = defExistingVar("PSP0", PSP0)
-RSP0_CFA = defExistingVar("RSP0", RSP0)
+
+PSP0_CFA = defConst("PSP0", PSP0)
+RSP0_CFA = defConst("RSP0", RSP0)
defConst("DOCOL", DOCOL)
defConst("DOCON", DOCON)
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
QUIT = defWord("QUIT",
[LIT, 0, STATE_CFA, STORE,
LIT, 0, NUMTIB_CFA, STORE,
- RSP0_CFA, FETCH, RSPSTORE,
+ RSP0_CFA, RSPSTORE,
QUERY,
INTERPRET, PROMPT,
BRANCH,-4])
ABORT = defWord("ABORT",
- [PSP0_CFA, FETCH, PSPSTORE, QUIT])
+ [PSP0_CFA, PSPSTORE, QUIT])
INCLUDE = defPrimWord("INCLUDE", () -> begin
pushPS(32)
end
function printPS()
- count = reg.PSP - mem[PSP0]
+ count = reg.PSP - PSP0
if count > 0
print("<$count>")
- for i in (mem[PSP0]+1):reg.PSP
+ for i in (PSP0+1):reg.PSP
print(" $(mem[i])")
end
println()
end
function printRS()
- count = reg.RSP - mem[RSP0]
+ count = reg.RSP - RSP0
if count > 0
print("<$count>")
- for i in (mem[RSP0]+1):reg.RSP
+ for i in (RSP0+1):reg.RSP
print(" $(mem[i])")
end
println()
The Lambda Lab / projects / forth.jl.git / blobdiff