implemented support for the AVR CPU and standalone OS

compiler/cgen.nim

@@ -778,6 +778,9 @@ proc genMainProc(m: BModule) =
     PosixCMain = "int main(int argc, char** args, char** env) {$n" &
         "  cmdLine = args;$n" & "  cmdCount = argc;$n" & "  gEnv = env;$n" &
         "  NimMain();$n" & "  return nim_program_result;$n" & "}$n"
+    StandaloneCMain = "int main(void) {$n" &
+        "  NimMain();$n" & 
+        "  return 0;$n" & "}$n"
     WinNimMain = "N_CDECL(void, NimMain)(void) {$n" &
         CommonMainBody & "}$n"
     WinCMain = "N_STDCALL(int, WinMain)(HINSTANCE hCurInstance, $n" &
@@ -807,6 +810,9 @@ proc genMainProc(m: BModule) =
   elif optGenDynLib in gGlobalOptions:
     nimMain = posixNimDllMain
     otherMain = posixCDllMain
+  elif platform.targetOS == osStandalone:
+    nimMain = PosixNimMain
+    otherMain = StandaloneCMain
   else:
     nimMain = PosixNimMain
     otherMain = PosixCMain

compiler/platform.nim

@@ -21,7 +21,8 @@ type
                     # conditionals to condsyms (end of module).
     osNone, osDos, osWindows, osOs2, osLinux, osMorphos, osSkyos, osSolaris, 
     osIrix, osNetbsd, osFreebsd, osOpenbsd, osAix, osPalmos, osQnx, osAmiga, 
-    osAtari, osNetware, osMacos, osMacosx, osEcmaScript, osNimrodVM
+    osAtari, osNetware, osMacos, osMacosx, osEcmaScript, osNimrodVM, 
+    osStandalone
 
 type 
   TInfoOSProp* = enum 
@@ -139,14 +140,18 @@ const
       exeExt: "", extSep: ".", props: {}), 
      (name: "NimrodVM", parDir: "..", dllFrmt: "lib$1.so", altDirSep: "/", 
       objExt: ".o", newLine: "\x0A", pathSep: ":", dirSep: "/", 
-      scriptExt: ".sh", curDir: ".", exeExt: "", extSep: ".", props: {})]
+      scriptExt: ".sh", curDir: ".", exeExt: "", extSep: ".", props: {}),
+     (name: "Standalone", parDir: "..", dllFrmt: "lib$1.so", altDirSep: "/",
+      objExt: ".o", newLine: "\x0A", pathSep: ":", dirSep: "/",
+      scriptExt: ".sh", curDir: ".", exeExt: ".elf", extSep: ".", 
+      props: {})]
 
 type 
   TSystemCPU* = enum # Also add CPU for in initialization section and 
                      # alias conditionals to condsyms (end of module).
     cpuNone, cpuI386, cpuM68k, cpuAlpha, cpuPowerpc, cpuPowerpc64,
     cpuSparc, cpuVm, cpuIa64, cpuAmd64, cpuMips, cpuArm, 
-    cpuEcmaScript, cpuNimrodVM
+    cpuEcmaScript, cpuNimrodVM, cpuAVR
 
 type 
   TEndian* = enum 
@@ -169,7 +174,8 @@ const
     (name: "mips", intSize: 32, endian: bigEndian, floatSize: 64, bit: 32), 
     (name: "arm", intSize: 32, endian: littleEndian, floatSize: 64, bit: 32), 
     (name: "ecmascript", intSize: 32, endian: bigEndian,floatSize: 64,bit: 32), 
-    (name: "nimrodvm", intSize: 32, endian: bigEndian, floatSize: 64, bit: 32)]
+    (name: "nimrodvm", intSize: 32, endian: bigEndian, floatSize: 64, bit: 32),
+    (name: "avr", intSize: 16, endian: littleEndian, floatSize: 32, bit: 16)]
 
 var 
   targetCPU*, hostCPU*: TSystemCPU

koch.nim

@@ -141,7 +141,7 @@ proc boot(args: string) =
       return
     copyExe(output, (i+1).thVersion)
   copyExe(output, finalDest)
-  echo "[Warning] executables are still not equal"
+  when not defined(windows): echo "[Warning] executables are still not equal"
 
 # -------------- clean --------------------------------------------------------
 

lib/system.nim

@@ -851,7 +851,7 @@ template sysAssert(cond: bool, msg: string) =
 
 include "system/inclrtl"
 
-when not defined(ecmascript) and not defined(nimrodVm):
+when not defined(ecmascript) and not defined(nimrodVm) and not defined(avr):
   include "system/cgprocs"
 
 proc add *[T](x: var seq[T], y: T) {.magic: "AppendSeqElem", noSideEffect.}
@@ -1604,9 +1604,10 @@ when not defined(EcmaScript) and not defined(NimrodVM):
   {.push stack_trace: off.}
 
   proc initGC()
-  when not defined(boehmgc):
+  when not defined(boehmgc) and not defined(useMalloc):
     proc initAllocator() {.inline.}
 
+  when not defined(nogc):
     proc initStackBottom() {.inline.} = 
       # WARNING: This is very fragile! An array size of 8 does not work on my
       # Linux 64bit system. Very strange, but we are at the will of GCC's 
@@ -1868,7 +1869,7 @@ when not defined(EcmaScript) and not defined(NimrodVM):
   when hasThreadSupport:
     include "system/syslocks"
     include "system/threads"
-  else:
+  elif not defined(nogc):
     initStackBottom()
     initGC()
 
@@ -1881,21 +1882,23 @@ when not defined(EcmaScript) and not defined(NimrodVM):
     ## for debug builds.
     
   {.push stack_trace: off.}
+  when hostCPU == "avr":
+    include "system/embedded"
+  else:
     include "system/excpt"
+    
   # we cannot compile this with stack tracing on
   # as it would recurse endlessly!
   include "system/arithm"
   {.pop.} # stack trace
   {.pop.} # stack trace
       
-  include "system/dyncalls"
+  when hostOS != "standalone": include "system/dyncalls"
   include "system/sets"
 
   const
     GenericSeqSize = (2 * sizeof(int))
     
-  proc reprAny(p: pointer, typ: PNimType): string {.compilerRtl.}
-
   proc getDiscriminant(aa: Pointer, n: ptr TNimNode): int =
     sysAssert(n.kind == nkCase, "getDiscriminant: node != nkCase")
     var d: int
@@ -1918,7 +1921,7 @@ when not defined(EcmaScript) and not defined(NimrodVM):
 
   include "system/mmdisp"
   {.push stack_trace: off.}
-  include "system/sysstr"
+  when hostCPU != "avr": include "system/sysstr"
   {.pop.}
 
   include "system/sysio"
@@ -1938,6 +1941,7 @@ when not defined(EcmaScript) and not defined(NimrodVM):
     var res = TaintedString(newStringOfCap(80))
     while f.readLine(res): yield TaintedString(res)
 
+  when hostCPU != "avr":
     include "system/assign"
     include "system/repr"
 

lib/system/excpt.nim

@@ -27,7 +27,7 @@ else:
   proc writeToStdErr(msg: CString) =
     discard MessageBoxA(0, msg, nil, 0)
 
-proc registerSignalHandler() {.compilerproc.}
+proc registerSignalHandler()
 
 proc chckIndx(i, a, b: int): int {.inline, compilerproc.}
 proc chckRange(i, a, b: int): int {.inline, compilerproc.}

lib/system/mmdisp.nim

@@ -181,6 +181,78 @@ when defined(boehmgc):
   proc deallocOsPages() {.inline.} = nil
 
   include "system/cellsets"
+elif defined(nogc) and defined(useMalloc):
+  
+  when not defined(useNimRtl):
+    proc alloc(size: int): pointer =
+      result = cmalloc(size)
+      if result == nil: raiseOutOfMem()
+    proc alloc0(size: int): pointer =
+      result = alloc(size)
+      zeroMem(result, size)
+    proc realloc(p: Pointer, newsize: int): pointer =
+      result = crealloc(p, newsize)
+      if result == nil: raiseOutOfMem()
+    proc dealloc(p: Pointer) = cfree(p)
+    
+    proc allocShared(size: int): pointer =
+      result = cmalloc(size)
+      if result == nil: raiseOutOfMem()
+    proc allocShared0(size: int): pointer =
+      result = alloc(size)
+      zeroMem(result, size)
+    proc reallocShared(p: Pointer, newsize: int): pointer =
+      result = crealloc(p, newsize)
+      if result == nil: raiseOutOfMem()
+    proc deallocShared(p: Pointer) = cfree(p)
+
+    proc GC_disable() = nil
+    proc GC_enable() = nil
+    proc GC_fullCollect() = nil
+    proc GC_setStrategy(strategy: TGC_Strategy) = nil
+    proc GC_enableMarkAndSweep() = nil
+    proc GC_disableMarkAndSweep() = nil
+    proc GC_getStatistics(): string = return ""
+    
+    proc getOccupiedMem(): int = nil
+    proc getFreeMem(): int = nil
+    proc getTotalMem(): int = nil
+    
+    proc setStackBottom(theStackBottom: pointer) = nil
+
+  proc initGC() = nil
+
+  proc newObj(typ: PNimType, size: int): pointer {.compilerproc.} =
+    result = alloc(size)
+  proc newSeq(typ: PNimType, len: int): pointer {.compilerproc.} =
+    result = newObj(typ, addInt(mulInt(len, typ.base.size), GenericSeqSize))
+    cast[PGenericSeq](result).len = len
+    cast[PGenericSeq](result).reserved = len
+
+  proc growObj(old: pointer, newsize: int): pointer =
+    result = realloc(old, newsize)
+
+  proc nimGCref(p: pointer) {.compilerproc, inline.} = nil
+  proc nimGCunref(p: pointer) {.compilerproc, inline.} = nil
+  
+  proc unsureAsgnRef(dest: ppointer, src: pointer) {.compilerproc, inline.} =
+    dest[] = src
+  proc asgnRef(dest: ppointer, src: pointer) {.compilerproc, inline.} =
+    dest[] = src
+  proc asgnRefNoCycle(dest: ppointer, src: pointer) {.compilerproc, inline.} =
+    dest[] = src
+
+  type
+    TMemRegion = object {.final, pure.}
+  
+  proc Alloc(r: var TMemRegion, size: int): pointer =
+    result = alloc(size)
+  proc Alloc0(r: var TMemRegion, size: int): pointer =
+    result = alloc0(size)
+  proc Dealloc(r: var TMemRegion, p: Pointer) = Dealloc(p)
+  proc deallocOsPages(r: var TMemRegion) {.inline.} = nil
+  proc deallocOsPages() {.inline.} = nil
+
 elif defined(nogc):
   # Even though we don't want the GC, we cannot simply use C's memory manager
   # because Nimrod's runtime wants ``realloc`` to zero out the additional

lib/system/repr.nim

@@ -9,6 +9,8 @@
 
 # The generic ``repr`` procedure. It is an invaluable debugging tool.
 
+proc reprAny(p: pointer, typ: PNimType): string {.compilerRtl.}
+
 proc reprInt(x: int64): string {.compilerproc.} = return $x
 proc reprFloat(x: float): string {.compilerproc.} = return $x