support for the Genode OS framework (#5560)

lib/genode_cpp/syslocks.h

@@ -0,0 +1,78 @@
+/*
+ *
+ *           Nim's Runtime Library
+ *       (c) Copyright 2017 Emery Hemingway
+ *
+ *   See the file "copying.txt", included in this
+ *   distribution, for details about the copyright.
+ *
+ */
+
+#ifndef _GENODE_CPP__SYSLOCKS_H_
+#define _GENODE_CPP__SYSLOCKS_H_
+
+/* Genode includes */
+#include <base/semaphore.h>
+#include <base/lock.h>
+
+namespace Nim {
+	struct SysLock;
+	struct SysCond;
+}
+
+struct Nim::SysLock
+{
+	Genode::Lock _lock_a, _lock_b;
+	bool         _locked;
+
+	void acquireSys()
+	{
+		_lock_a.lock();
+		_locked = true;
+		_lock_a.unlock();
+		_lock_b.lock();
+	}
+
+	bool tryAcquireSys()
+	{
+		if (_locked)
+			return false;
+
+		_lock_a.lock();
+		if (_locked) {
+			_lock_a.unlock();
+			return false;
+		} else {
+			_locked = true;
+			_lock_b.lock();
+			_lock_a.unlock();
+			return true;
+		}
+	}
+
+	void releaseSys()
+	{
+		_locked = false;
+		_lock_a.unlock();
+		_lock_b.unlock();
+	}
+};
+
+struct Nim::SysCond
+{
+	Genode::Semaphore _semaphore;
+
+	void waitSysCond(SysLock &syslock)
+	{
+		syslock.releaseSys();
+		_semaphore.down();
+		syslock.acquireSys();
+	}
+
+	void signalSysCond()
+	{
+		_semaphore.up();
+	}
+};
+
+#endif

lib/genode_cpp/threads.h

@@ -0,0 +1,69 @@
+/*
+ *
+ *           Nim's Runtime Library
+ *       (c) Copyright 2017 Emery Hemingway
+ *
+ *   See the file "copying.txt", included in this
+ *   distribution, for details about the copyright.
+ *
+ */
+
+
+#ifndef _GENODE_CPP__THREAD_H_
+#define _GENODE_CPP__THREAD_H_
+
+#include <base/thread.h>
+#include <util/avl_tree.h>
+#include <util/reconstructible.h>
+
+namespace Nim { struct SysThread; }
+
+struct Nim::SysThread
+{
+	typedef void (Entry)(void*);
+
+	struct Thread : Genode::Thread
+	{
+		void *_tls;
+
+		Entry *_func;
+		void  *_arg;
+
+		void entry() override {
+			(_func)(_arg); }
+
+		Thread(Genode::Env &env, Genode::size_t stack_size, Entry func, void *arg)
+		: Genode::Thread(env, "nim-thread", stack_size), _func(func), _arg(arg)
+		{
+			Genode::Thread::start();
+		}
+	};
+
+	Genode::Constructible<Thread> _thread;
+
+	void initThread(Genode::Env *env, Genode::size_t stack_size, Entry func, void *arg) {
+		_thread.construct(*env, stack_size, func, arg); }
+
+	void joinThread() {
+		_thread->join(); }
+
+	static bool offMainThread() {
+		return dynamic_cast<SysThread::Thread*>(Genode::Thread::myself()); }
+
+	static void *threadVarGetValue()
+	{
+		SysThread::Thread *thr =
+			static_cast<SysThread::Thread*>(Genode::Thread::myself());
+		return thr->_tls;
+	}
+
+	static void threadVarSetValue(void *value)
+	{
+		SysThread::Thread *thr =
+			static_cast<SysThread::Thread*>(Genode::Thread::myself());
+		thr->_tls = value;
+	}
+
+};
+
+#endif

lib/nimbase.h

@@ -498,6 +498,11 @@ typedef int Nim_and_C_compiler_disagree_on_target_architecture[sizeof(NI) == siz
 #  include <sys/types.h>
 #endif
 
+#if defined(__GENODE__)
+#include <libc/component.h>
+extern Libc::Env *genodeEnv;
+#endif
+
 /* Compile with -d:checkAbi and a sufficiently C11:ish compiler to enable */
 #define NIM_CHECK_SIZE(typ, sz) \
   _Static_assert(sizeof(typ) == sz, "Nim & C disagree on type size")

lib/pure/concurrency/cpuinfo.nim

@@ -37,6 +37,10 @@ when defined(macosx) or defined(bsd):
               a: var csize, b: pointer, c: int): cint {.
               importc: "sysctl", nodecl.}
 
+when defined(genode):
+  proc affinitySpaceTotal(): cuint {.
+    importcpp: "genodeEnv->cpu().affinity_space().total()".}
+
 proc countProcessors*(): int {.rtl, extern: "ncpi$1".} =
   ## returns the numer of the processors/cores the machine has.
   ## Returns 0 if it cannot be detected.
@@ -61,7 +65,8 @@ proc countProcessors*(): int {.rtl, extern: "ncpi$1".} =
   elif defined(irix):
     var SC_NPROC_ONLN {.importc: "_SC_NPROC_ONLN", header: "<unistd.h>".}: cint
     result = sysconf(SC_NPROC_ONLN)
+  elif defined(genode):
+    result = affinitySpaceTotal().int
   else:
     result = sysconf(SC_NPROCESSORS_ONLN)
   if result <= 0: result = 1
-

lib/pure/os.nim

@@ -825,16 +825,16 @@ proc putEnv*(key, val: string) {.tags: [WriteEnvEffect].} =
   else:
     add environment, (key & '=' & val)
     indx = high(environment)
-  when defined(unix):
-    if c_putenv(environment[indx]) != 0'i32:
-      raiseOSError(osLastError())
-  else:
+  when defined(windows):
     when useWinUnicode:
       var k = newWideCString(key)
       var v = newWideCString(val)
       if setEnvironmentVariableW(k, v) == 0'i32: raiseOSError(osLastError())
     else:
       if setEnvironmentVariableA(key, val) == 0'i32: raiseOSError(osLastError())
+  else:
+    if c_putenv(environment[indx]) != 0'i32:
+      raiseOSError(osLastError())
 
 iterator envPairs*(): tuple[key, value: TaintedString] {.tags: [ReadEnvEffect].} =
   ## Iterate over all `environments variables`:idx:. In the first component
@@ -1091,7 +1091,7 @@ proc rawCreateDir(dir: string): bool =
       result = false
     else:
       raiseOSError(osLastError())
-  elif defined(unix):
+  elif defined(posix):
     let res = mkdir(dir, 0o777)
     if res == 0'i32:
       result = true
@@ -1452,7 +1452,9 @@ elif defined(windows):
     if isNil(ownArgv): ownArgv = parseCmdLine($getCommandLine())
     return TaintedString(ownArgv[i])
 
-elif not defined(createNimRtl) and not(defined(posix) and appType == "lib"):
+elif not defined(createNimRtl) and
+  not(defined(posix) and appType == "lib") and
+  not defined(genode):
   # On Posix, there is no portable way to get the command line from a DLL.
   var
     cmdCount {.importc: "cmdCount".}: cint
@@ -1606,6 +1608,8 @@ proc getAppFilename*(): string {.rtl, extern: "nos$1", tags: [ReadIOEffect].} =
       result = getApplAux("/proc/self/exe")
     elif defined(solaris):
       result = getApplAux("/proc/" & $getpid() & "/path/a.out")
+    elif defined(genode):
+      raiseOSError("POSIX command line not supported")
     elif defined(freebsd) or defined(dragonfly):
       result = getApplFreebsd()
     # little heuristic that may work on other POSIX-like systems:

lib/system.nim

@@ -1384,25 +1384,34 @@ var programResult* {.exportc: "nim_program_result".}: int
   ## under normal circumstances. When the program is terminated
   ## prematurely using ``quit``, this value is ignored.
 
-proc quit*(errorcode: int = QuitSuccess) {.
-  magic: "Exit", importc: "exit", header: "<stdlib.h>", noreturn.}
-  ## Stops the program immediately with an exit code.
-  ##
-  ## Before stopping the program the "quit procedures" are called in the
-  ## opposite order they were added with `addQuitProc <#addQuitProc>`_.
-  ## ``quit`` never returns and ignores any exception that may have been raised
-  ## by the quit procedures.  It does *not* call the garbage collector to free
-  ## all the memory, unless a quit procedure calls `GC_fullCollect
-  ## <#GC_fullCollect>`_.
-  ##
-  ## The proc ``quit(QuitSuccess)`` is called implicitly when your nim
-  ## program finishes without incident. A raised unhandled exception is
-  ## equivalent to calling ``quit(QuitFailure)``.
-  ##
-  ## Note that this is a *runtime* call and using ``quit`` inside a macro won't
-  ## have any compile time effect. If you need to stop the compiler inside a
-  ## macro, use the `error <manual.html#error-pragma>`_ or `fatal
-  ## <manual.html#fatal-pragma>`_ pragmas.
+when defined(nimdoc):
+  proc quit*(errorcode: int = QuitSuccess) {.magic: "Exit", noreturn.}
+    ## Stops the program immediately with an exit code.
+    ##
+    ## Before stopping the program the "quit procedures" are called in the
+    ## opposite order they were added with `addQuitProc <#addQuitProc>`_.
+    ## ``quit`` never returns and ignores any exception that may have been raised
+    ## by the quit procedures.  It does *not* call the garbage collector to free
+    ## all the memory, unless a quit procedure calls `GC_fullCollect
+    ## <#GC_fullCollect>`_.
+    ##
+    ## The proc ``quit(QuitSuccess)`` is called implicitly when your nim
+    ## program finishes without incident. A raised unhandled exception is
+    ## equivalent to calling ``quit(QuitFailure)``.
+    ##
+    ## Note that this is a *runtime* call and using ``quit`` inside a macro won't
+    ## have any compile time effect. If you need to stop the compiler inside a
+    ## macro, use the `error <manual.html#error-pragma>`_ or `fatal
+    ## <manual.html#fatal-pragma>`_ pragmas.
+
+
+elif defined(genode):
+  proc quit*(errorcode: int = QuitSuccess) {.magic: "Exit", noreturn,
+    importcpp: "genodeEnv->parent().exit(@)", header: "<base/env.h>".}
+
+else:
+  proc quit*(errorcode: int = QuitSuccess) {.
+    magic: "Exit", importc: "exit", header: "<stdlib.h>", noreturn.}
 
 template sysAssert(cond: bool, msg: string) =
   when defined(useSysAssert):

lib/system/dyncalls.nim

@@ -146,6 +146,17 @@ elif defined(windows) or defined(dos):
       if result != nil: return
     procAddrError(name)
 
+elif defined(genode):
+
+  proc nimUnloadLibrary(lib: LibHandle) {.
+    error: "nimUnloadLibrary not implemented".}
+
+  proc nimLoadLibrary(path: string): LibHandle {.
+    error: "nimLoadLibrary not implemented".}
+
+  proc nimGetProcAddr(lib: LibHandle, name: cstring): ProcAddr {.
+    error: "nimGetProcAddr not implemented".}
+
 else:
   {.error: "no implementation for dyncalls".}
 

lib/system/osalloc.nim

@@ -77,6 +77,19 @@ when defined(emscripten):
     var mmapDescr = cast[EmscriptenMMapBlock](mmapDescrPos)
     munmap(mmapDescr.realPointer, mmapDescr.realSize)
 
+elif defined(genode):
+
+  proc osAllocPages(size: int): pointer {.
+   importcpp: "genodeEnv->rm().attach(genodeEnv->ram().alloc(@))".}
+
+  proc osTryAllocPages(size: int): pointer =
+    {.emit: """try {""".}
+    result = osAllocPages size
+    {.emit: """} catch (...) { }""".}
+
+  proc osDeallocPages(p: pointer, size: int) {.
+    importcpp: "genodeEnv->rm().detach(#)".}
+
 elif defined(posix):
   const
     PROT_READ  = 1             # page can be read

lib/system/syslocks.nim

@@ -75,6 +75,28 @@ when defined(Windows):
   proc waitSysCondWindows(cond: var SysCond) =
     discard waitForSingleObject(cond, -1'i32)
 
+elif defined(genode):
+  const
+    Header = "genode_cpp/syslocks.h"
+  type
+    SysLock {.importcpp: "Nim::SysLock", pure, final,
+              header: Header.} = object
+    SysCond {.importcpp: "Nim::SysCond", pure, final,
+              header: Header.} = object
+
+  proc initSysLock(L: var SysLock) = discard
+  proc deinitSys(L: var SysLock) = discard
+  proc acquireSys(L: var SysLock) {.noSideEffect, importcpp.}
+  proc tryAcquireSys(L: var SysLock): bool {.noSideEffect, importcpp.}
+  proc releaseSys(L: var SysLock) {.noSideEffect, importcpp.}
+
+  proc initSysCond(L: var SysCond) = discard
+  proc deinitSysCond(L: var SysCond) = discard
+  proc waitSysCond(cond: var SysCond, lock: var SysLock) {.
+    noSideEffect, importcpp.}
+  proc signalSysCond(cond: var SysCond) {.
+    noSideEffect, importcpp.}
+
 else:
   type
     SysLock {.importc: "pthread_mutex_t", pure, final,

lib/system/threads.nim

@@ -46,7 +46,11 @@ const
   maxRegisters = 256 # don't think there is an arch with more registers
   useStackMaskHack = false ## use the stack mask hack for better performance
   StackGuardSize = 4096
-  ThreadStackMask = 1024*256*sizeof(int)-1
+  ThreadStackMask =
+    when defined(genode):
+      1024*64*sizeof(int)-1
+    else:
+      1024*256*sizeof(int)-1
   ThreadStackSize = ThreadStackMask+1 - StackGuardSize
 
 when defined(windows):
@@ -115,6 +119,49 @@ when defined(windows):
     ## get the ID of the currently running thread.
     result = int(getCurrentThreadId())
 
+elif defined(genode):
+  const
+    GenodeHeader = "genode_cpp/threads.h"
+  type
+    SysThread* {.importcpp: "Nim::SysThread",
+                 header: GenodeHeader, final, pure.} = object
+    GenodeThreadProc = proc (x: pointer) {.noconv.}
+    ThreadVarSlot = int
+
+  proc initThread(s: var SysThread,
+                  stackSize: culonglong,
+                  entry: GenodeThreadProc,
+                  arg: pointer) {.
+    importcpp: "#.initThread(genodeEnv, @)".}
+
+  proc threadVarAlloc(): ThreadVarSlot = 0
+
+  proc offMainThread(): bool {.
+    importcpp: "Nim::SysThread::offMainThread",
+    header: GenodeHeader.}
+
+  proc threadVarSetValue(value: pointer) {.
+    importcpp: "Nim::SysThread::threadVarSetValue(@)",
+    header: GenodeHeader.}
+
+  proc threadVarGetValue(): pointer {.
+    importcpp: "Nim::SysThread::threadVarGetValue()",
+    header: GenodeHeader.}
+
+  var mainTls: pointer
+
+  proc threadVarSetValue(s: ThreadVarSlot, value: pointer) {.inline.} =
+    if offMainThread():
+      threadVarSetValue(value);
+    else:
+      mainTls = value
+
+  proc threadVarGetValue(s: ThreadVarSlot): pointer {.inline.} =
+    if offMainThread():
+      threadVarGetValue();
+    else:
+      mainTls
+
 else:
   when not defined(macosx):
     {.passL: "-pthread".}
@@ -451,6 +498,9 @@ when defined(windows):
   proc threadProcWrapper[TArg](closure: pointer): int32 {.stdcall.} =
     threadProcWrapperBody(closure)
     # implicitly return 0
+elif defined(genode):
+   proc threadProcWrapper[TArg](closure: pointer) {.noconv.} =
+    threadProcWrapperBody(closure)
 else:
   proc threadProcWrapper[TArg](closure: pointer): pointer {.noconv.} =
     threadProcWrapperBody(closure)
@@ -482,6 +532,14 @@ when hostOS == "windows":
                                      cast[ptr SysThread](addr(a)), 1, -1)
       inc(k, MAXIMUM_WAIT_OBJECTS)
 
+elif defined(genode):
+  proc joinThread*[TArg](t: Thread[TArg]) {.importcpp.}
+    ## waits for the thread `t` to finish.
+
+  proc joinThreads*[TArg](t: varargs[Thread[TArg]]) =
+    ## waits for every thread in `t` to finish.
+    for i in 0..t.high: joinThread(t[i])
+
 else:
   proc joinThread*[TArg](t: Thread[TArg]) {.inline.} =
     ## waits for the thread `t` to finish.
@@ -531,6 +589,21 @@ when hostOS == "windows":
     ## shouldn't use this proc.
     setThreadAffinityMask(t.sys, uint(1 shl cpu))
 
+elif defined(genode):
+  proc createThread*[TArg](t: var Thread[TArg],
+                           tp: proc (arg: TArg) {.thread, nimcall.},
+                           param: TArg) =
+    when TArg isnot void: t.data = param
+    t.dataFn = tp
+    when hasSharedHeap: t.stackSize = ThreadStackSize
+    t.sys.initThread(
+      ThreadStackSize.culonglong,
+      threadProcWrapper[TArg], addr(t))
+
+  proc pinToCpu*[Arg](t: var Thread[Arg]; cpu: Natural) =
+    {.hint: "cannot change Genode thread CPU affinity after initialization".}
+    discard
+
 else:
   proc createThread*[TArg](t: var Thread[TArg],
                            tp: proc (arg: TArg) {.thread, nimcall.},