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#
#
# The Nim Compiler
# (c) Copyright 2012 Andreas Rumpf
#
# See the file "copying.txt", included in this
# distribution, for details about the copyright.
#
## Thread var support for crappy architectures that lack native support for
## thread local storage. (**Thank you Mac OS X!**)
# included from cgen.nim
proc emulatedThreadVars(): bool =
result = {optThreads, optTlsEmulation} <= gGlobalOptions
proc accessThreadLocalVar(p: BProc, s: PSym) =
if emulatedThreadVars() and not p.threadVarAccessed:
p.threadVarAccessed = true
incl p.module.flags, usesThreadVars
addf(p.procSec(cpsLocals), "\tNimThreadVars* NimTV_;$n", [])
add(p.procSec(cpsInit),
ropecg(p.module, "\tNimTV_ = (NimThreadVars*) #GetThreadLocalVars();$n"))
var
nimtv: Rope # Nim thread vars; the struct body
nimtvDeps: seq[PType] = @[] # type deps: every module needs whole struct
nimtvDeclared = initIntSet() # so that every var/field exists only once
# in the struct
# 'nimtv' is incredibly hard to modularize! Best effort is to store all thread
# vars in a ROD section and with their type deps and load them
# unconditionally...
# nimtvDeps is VERY hard to cache because it's not a list of IDs nor can it be
# made to be one.
proc declareThreadVar(m: BModule, s: PSym, isExtern: bool) =
if emulatedThreadVars():
# we gather all thread locals var into a struct; we need to allocate
# storage for that somehow, can't use the thread local storage
# allocator for it :-(
if not containsOrIncl(nimtvDeclared, s.id):
nimtvDeps.add(s.loc.t)
addf(nimtv, "$1 $2;$n", [getTypeDesc(m, s.loc.t), s.loc.r])
else:
if isExtern: add(m.s[cfsVars], "extern ")
if optThreads in gGlobalOptions: add(m.s[cfsVars], "NIM_THREADVAR ")
add(m.s[cfsVars], getTypeDesc(m, s.loc.t))
addf(m.s[cfsVars], " $1;$n", [s.loc.r])
proc generateThreadLocalStorage(m: BModule) =
if nimtv != nil and (usesThreadVars in m.flags or sfMainModule in m.module.flags):
for t in items(nimtvDeps): discard getTypeDesc(m, t)
addf(m.s[cfsSeqTypes], "typedef struct {$1} NimThreadVars;$n", [nimtv])
proc generateThreadVarsSize(m: BModule) =
if nimtv != nil:
let externc = if gCmd == cmdCompileToCpp or
sfCompileToCpp in m.module.flags: "extern \"C\" "
else: ""
addf(m.s[cfsProcs],
"$#NI NimThreadVarsSize(){return (NI)sizeof(NimThreadVars);}$n",
[externc.rope])
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