X-Git-Url: https://thelambdalab.xyz/gitweb/index.cgi?a=blobdiff_plain;f=src%2Fforth.jl;h=fb7121c27d13851b98c445e2daf7db1000219e4c;hb=87b17b0ee12c90f028186761fbb2bd5f6b4008eb;hp=a233743809fa806017a4ce0313d8d454fc51114d;hpb=366db53c2e77d243c744c11f68b8bdeb575c86e6;p=forth.jl.git

diff --git a/src/forth.jl b/src/forth.jl
index a233743..fb7121c 100644
--- a/src/forth.jl
+++ b/src/forth.jl
@@ -36,16 +36,14 @@ primNames = Array{ASCIIString,1}()
 # Built-in variables
 
 nextVarAddr = 1
-RSP0 = nextVarAddr; nextVarAddr += 1
-PSP0 = nextVarAddr; nextVarAddr += 1
 HERE = 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[HERE] = TIB + size_TIB          # location of bottom of dictionary
+mem[LATEST] = 0                     # no previous definition
 
 DICT = mem[HERE] # Save bottom of dictionary as constant
 
@@ -56,7 +54,7 @@ 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
 
@@ -66,8 +64,8 @@ type ReturnStackUnderflow <: Exception end
 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
@@ -237,8 +235,9 @@ end)
 
 HERE_CFA = defExistingVar("HERE", HERE)
 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)
@@ -567,7 +566,7 @@ RSPFETCH = defPrimWord("RSP@", () -> begin
 end)
 
 RSPSTORE = defPrimWord("RSP!", () -> begin
-    RSP = popPS()
+    reg.RSP = popPS()
     return NEXT
 end)
 
@@ -584,7 +583,7 @@ PSPFETCH = defPrimWord("PSP@", () -> begin
 end)
 
 PSPSTORE = defPrimWord("PSP!", () -> begin
-    PSP = popPS()
+    reg.PSP = popPS()
     return NEXT
 end)
 
@@ -764,7 +763,7 @@ NUMTIB, NUMTIB_CFA = defNewVar("#TIB", 0)
 TOIN, TOIN_CFA = defNewVar(">IN", 0)
 
 QUERY = defWord("QUERY",
-    [TIB_CFA, LIT, 80, EXPECT,
+    [TIB_CFA, LIT, 160, EXPECT,
     SPAN_CFA, FETCH, NUMTIB_CFA, STORE,
     LIT, 0, TOIN_CFA, STORE,
     EXIT])
@@ -876,11 +875,16 @@ PROMPT = defPrimWord("PROMPT", () -> begin
 end)
 
 QUIT = defWord("QUIT",
-    [RSP0_CFA, RSPSTORE,
+    [LIT, 0, STATE_CFA, STORE,
+    LIT, 0, NUMTIB_CFA, STORE,
+    RSP0_CFA, RSPSTORE,
     QUERY,
     INTERPRET, PROMPT,
     BRANCH,-4])
 
+ABORT = defWord("ABORT",
+    [PSP0_CFA, PSPSTORE, QUIT])
+
 INCLUDE = defPrimWord("INCLUDE", () -> begin
     pushPS(32)
     callPrim(mem[WORD])
@@ -984,7 +988,7 @@ function run(;initialize=true)
     jmp = NEXT
     while jmp != 0
         try
-#           println("Entering prim $(getPrimName(jmp))")
+            #println("Entering prim $(getPrimName(jmp))")
             jmp = callPrim(jmp)
 
         catch ex
@@ -995,16 +999,8 @@ function run(;initialize=true)
                 close(pop!(sources))
             end
 
-            # Want backtrace in here eventually
-            println("reg.W: $(reg.W) reg.IP: $(reg.IP)")
-            print("PS: "); printPS()
-            print("RS: "); printRS()
-
-            mem[STATE] = 0
-            mem[NUMTIB] = 0
-            reg.PSP = mem[PSP0]
-            reg.RSP = mem[RSP0]
-            reg.IP = QUIT + 1
+            # QUIT
+            reg.IP = ABORT + 1
             jmp = NEXT
         end
     end
@@ -1046,11 +1042,11 @@ function dump(startAddr::Int64; count::Int64 = 100, cellsPerLine::Int64 = 10)
 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()
@@ -1060,11 +1056,11 @@ function printPS()
 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()