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cgen.nim
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#
#
# The Nim Compiler
# (c) Copyright 2015 Andreas Rumpf
#
# See the file "copying.txt", included in this
# distribution, for details about the copyright.
#
## This module implements the C code generator.
import
std/[
hashes,
intsets,
os,
math,
tables,
sets
],
ast/[
ast,
astalgo,
trees,
nimsets,
idents,
types,
typesrenderer,
wordrecg,
treetab,
renderer,
reports,
lineinfos,
astmsgs,
ndi
],
modules/[
magicsys,
],
front/[
options,
msgs
],
utils/[
platform,
nversion,
bitsets,
ropes,
pathutils
],
sem/[
passes,
rodutils,
aliases,
lowerings,
transf,
injectdestructors
],
backend/[
extccomp,
ccgutils,
cgmeth,
cgendata
],
plugins/[
]
when not defined(leanCompiler):
import sem/[spawn, semparallel]
import std/strutils except `%` # collides with ropes.`%`
from ic / ic import ModuleBackendFlag
import dynlib
when not declared(dynlib.libCandidates):
proc libCandidates(s: string, dest: var seq[string]) =
## given a library name pattern `s` write possible library names to `dest`.
var le = strutils.find(s, '(')
var ri = strutils.find(s, ')', le+1)
if le >= 0 and ri > le:
var prefix = substr(s, 0, le - 1)
var suffix = substr(s, ri + 1)
for middle in split(substr(s, le + 1, ri - 1), '|'):
libCandidates(prefix & middle & suffix, dest)
else:
dest.add(s)
when options.hasTinyCBackend:
import backend/tccgen
proc hcrOn(m: BModule): bool = m.config.hcrOn
proc hcrOn(p: BProc): bool = p.module.config.hcrOn
proc addForwardedProc(m: BModule, prc: PSym) =
m.g.forwardedProcs.add(prc)
proc findPendingModule(m: BModule, s: PSym): BModule =
let ms = s.itemId.module #getModule(s)
result = m.g.modules[ms]
proc initLoc(result: var TLoc, k: TLocKind, lode: PNode, s: TStorageLoc) =
result.k = k
result.storage = s
result.lode = lode
result.r = nil
result.flags = {}
proc fillLoc(a: var TLoc, k: TLocKind, lode: PNode, r: Rope, s: TStorageLoc) =
# fills the loc if it is not already initialized
if a.k == locNone:
a.k = k
a.lode = lode
a.storage = s
if a.r == nil: a.r = r
proc t(a: TLoc): PType {.inline.} =
if a.lode.kind == nkSym:
result = a.lode.sym.typ
else:
result = a.lode.typ
proc lodeTyp(t: PType): PNode =
result = newNode(nkEmpty)
result.typ = t
proc isSimpleConst(typ: PType): bool =
let t = skipTypes(typ, abstractVar)
result = t.kind notin
{tyTuple, tyObject, tyArray, tySet, tySequence} and not
(t.kind == tyProc and t.callConv == ccClosure)
proc useHeader(m: BModule, sym: PSym) =
if lfHeader in sym.loc.flags:
assert(sym.annex != nil)
let str = getStr(sym.annex.path)
m.includeHeader(str)
proc cgsym(m: BModule, name: string): Rope
proc getCFile(m: BModule): AbsoluteFile
proc getModuleDllPath(m: BModule): Rope =
let (dir, name, ext) = splitFile(getCFile(m))
let filename = strutils.`%`(platform.OS[m.g.config.target.targetOS].dllFrmt, [name & ext])
result = makeCString(dir.string & "/" & filename)
proc getModuleDllPath(m: BModule, module: int): Rope =
result = getModuleDllPath(m.g.modules[module])
proc getModuleDllPath(m: BModule, s: PSym): Rope =
result = getModuleDllPath(m.g.modules[s.itemId.module])
import macros
proc cgFormatValue(result: var string; value: Rope) =
for str in leaves(value):
result.add str
proc cgFormatValue(result: var string; value: string) =
result.add value
proc cgFormatValue(result: var string; value: BiggestInt) =
result.addInt value
proc cgFormatValue(result: var string; value: Int128) =
result.addInt128 value
# TODO: please document
macro ropecg(m: BModule, frmt: static[FormatStr], args: untyped): Rope =
args.expectKind nnkBracket
# echo "ropecg ", newLit(frmt).repr, ", ", args.repr
var i = 0
result = nnkStmtListExpr.newTree()
result.add quote do:
assert `m` != nil
let resVar = genSym(nskVar, "res")
# during `koch boot` the median of all generates strings from this
# macro is around 40 bytes in length.
result.add newVarStmt(resVar, newCall(bindSym"newStringOfCap", newLit(80)))
let formatValue = bindSym"cgFormatValue"
var num = 0
var strLit = ""
template flushStrLit() =
if strLit != "":
result.add newCall(ident "add", resVar, newLit(strLit))
strLit.setLen 0
while i < frmt.len:
if frmt[i] == '$':
inc(i) # skip '$'
case frmt[i]
of '$':
strLit.add '$'
inc(i)
of '#':
flushStrLit()
inc(i)
result.add newCall(formatValue, resVar, args[num])
inc(num)
of '0'..'9':
var j = 0
while true:
j = (j * 10) + ord(frmt[i]) - ord('0')
inc(i)
if i >= frmt.len or not (frmt[i] in {'0'..'9'}): break
num = j
if j > args.len:
error("ropes: invalid format string " & newLit(frmt).repr & " args.len: " & $args.len)
flushStrLit()
result.add newCall(formatValue, resVar, args[j-1])
of 'n':
flushStrLit()
result.add quote do:
if optLineDir notin `m`.config.options:
`resVar`.add("\L")
inc(i)
of 'N':
strLit.add "\L"
inc(i)
else:
error("ropes: invalid format string $" & frmt[i])
elif frmt[i] == '#' and frmt[i+1] in IdentStartChars:
inc(i)
var j = i
while frmt[j] in IdentChars: inc(j)
var ident = newLit(substr(frmt, i, j-1))
i = j
flushStrLit()
result.add newCall(formatValue, resVar, newCall(ident"cgsym", m, ident))
elif frmt[i] == '#' and frmt[i+1] == '$':
inc(i, 2)
var j = 0
while frmt[i] in Digits:
j = (j * 10) + ord(frmt[i]) - ord('0')
inc(i)
let ident = args[j-1]
flushStrLit()
result.add newCall(formatValue, resVar, newCall(ident"cgsym", m, ident))
var start = i
while i < frmt.len:
if frmt[i] != '$' and frmt[i] != '#': inc(i)
else: break
if i - 1 >= start:
strLit.add(substr(frmt, start, i - 1))
flushStrLit()
result.add newCall(ident"rope", resVar)
proc indentLine(p: BProc, r: Rope): Rope =
result = r
for i in 0..<p.blocks.len:
prepend(result, "\t".rope)
template appcg(m: BModule, c: var Rope, frmt: FormatStr,
args: untyped) =
c.add(ropecg(m, frmt, args))
template appcg(m: BModule, sec: TCFileSection, frmt: FormatStr,
args: untyped) =
m.s[sec].add(ropecg(m, frmt, args))
template appcg(p: BProc, sec: TCProcSection, frmt: FormatStr,
args: untyped) =
p.s(sec).add(ropecg(p.module, frmt, args))
template line(p: BProc, sec: TCProcSection, r: Rope) =
p.s(sec).add(indentLine(p, r))
template line(p: BProc, sec: TCProcSection, r: string) =
p.s(sec).add(indentLine(p, r.rope))
template lineF(p: BProc, sec: TCProcSection, frmt: FormatStr,
args: untyped) =
p.s(sec).add(indentLine(p, frmt % args))
template lineCg(p: BProc, sec: TCProcSection, frmt: FormatStr,
args: untyped) =
p.s(sec).add(indentLine(p, ropecg(p.module, frmt, args)))
template linefmt(p: BProc, sec: TCProcSection, frmt: FormatStr,
args: untyped) =
p.s(sec).add(indentLine(p, ropecg(p.module, frmt, args)))
proc safeLineNm(info: TLineInfo): int =
result = toLinenumber(info)
if result < 0: result = 0 # negative numbers are not allowed in #line
proc genCLineDir(r: var Rope, filename: string, line: int; conf: ConfigRef) =
assert line >= 0
if optLineDir in conf.options and line > 0:
r.addf("$N#line $2 $1$N",
[rope(makeSingleLineCString(filename)), rope(line)])
proc genCLineDir(r: var Rope, info: TLineInfo; conf: ConfigRef) =
genCLineDir(r, toFullPath(conf, info), info.safeLineNm, conf)
proc freshLineInfo(p: BProc; info: TLineInfo): bool =
if p.lastLineInfo.line != info.line or
p.lastLineInfo.fileIndex != info.fileIndex:
p.lastLineInfo.line = info.line
p.lastLineInfo.fileIndex = info.fileIndex
result = true
proc genLineDir(p: BProc, t: PNode) =
let line = t.info.safeLineNm
if optEmbedOrigSrc in p.config.globalOptions:
p.s(cpsStmts).add(~"//" & sourceLine(p.config, t.info) & "\L")
genCLineDir(p.s(cpsStmts), toFullPath(p.config, t.info), line, p.config)
if ({optLineTrace, optStackTrace} * p.options == {optLineTrace, optStackTrace}) and
(p.prc == nil or sfPure notin p.prc.flags) and t.info.fileIndex != InvalidFileIdx:
if freshLineInfo(p, t.info):
linefmt(p, cpsStmts, "nimln_($1, $2);$n",
[line, quotedFilename(p.config, t.info)])
proc accessThreadLocalVar(p: BProc, s: PSym)
proc emulatedThreadVars(conf: ConfigRef): bool {.inline.}
proc genProc(m: BModule, prc: PSym)
proc raiseInstr(p: BProc): Rope
template compileToCpp(m: BModule): untyped =
m.config.backend == backendCpp or sfCompileToCpp in m.module.flags
proc getTempName(m: BModule): Rope =
result = m.tmpBase & rope(m.labels)
inc m.labels
proc rdLoc(a: TLoc): Rope =
# 'read' location (deref if indirect)
result = a.r
if lfIndirect in a.flags: result = "(*$1)" % [result]
proc lenField(p: BProc): Rope =
result = rope(if p.module.compileToCpp: "len" else: "Sup.len")
proc lenExpr(p: BProc; a: TLoc): Rope =
if optSeqDestructors in p.config.globalOptions:
result = rdLoc(a) & ".len"
else:
result = "($1 ? $1->$2 : 0)" % [rdLoc(a), lenField(p)]
proc dataField(p: BProc): Rope =
if optSeqDestructors in p.config.globalOptions:
result = rope".p->data"
else:
result = rope"->data"
include ccgliterals
include ccgtypes
# ------------------------------ Manager of temporaries ------------------
template mapTypeChooser(n: PNode): TSymKind =
(if n.kind == nkSym: n.sym.kind else: skVar)
template mapTypeChooser(a: TLoc): TSymKind = mapTypeChooser(a.lode)
proc addrLoc(conf: ConfigRef; a: TLoc): Rope =
result = a.r
if lfIndirect notin a.flags and mapType(conf, a.t, mapTypeChooser(a)) != ctArray:
result = "(&" & result & ")"
proc byRefLoc(p: BProc; a: TLoc): Rope =
result = a.r
if lfIndirect notin a.flags and mapType(p.config, a.t, mapTypeChooser(a)) != ctArray and not
p.module.compileToCpp:
result = "(&" & result & ")"
proc rdCharLoc(a: TLoc): Rope =
# read a location that may need a char-cast:
result = rdLoc(a)
if skipTypes(a.t, abstractRange).kind == tyChar:
result = "((NU8)($1))" % [result]
type
TAssignmentFlag = enum
needToCopy
TAssignmentFlags = set[TAssignmentFlag]
proc genObjConstr(p: BProc, e: PNode, d: var TLoc)
proc rawConstExpr(p: BProc, n: PNode; d: var TLoc)
proc genAssignment(p: BProc, dest, src: TLoc, flags: TAssignmentFlags)
type
ObjConstrMode = enum
constructObj,
constructRefObj
proc genObjectInit(p: BProc, section: TCProcSection, t: PType, a: var TLoc,
mode: ObjConstrMode) =
#if optNimV2 in p.config.globalOptions: return
case analyseObjectWithTypeField(t)
of frNone:
discard
of frHeader:
var r = rdLoc(a)
if mode == constructRefObj: r = "(*$1)" % [r]
var s = skipTypes(t, abstractInst)
if not p.module.compileToCpp:
while s.kind == tyObject and s[0] != nil:
r.add(".Sup")
s = skipTypes(s[0], skipPtrs)
if optTinyRtti in p.config.globalOptions:
linefmt(p, section, "$1.m_type = $2;$n", [r, genTypeInfoV2(p.module, t, a.lode.info)])
else:
linefmt(p, section, "$1.m_type = $2;$n", [r, genTypeInfoV1(p.module, t, a.lode.info)])
of frEmbedded:
# inheritance in C++ does not allow struct initialization: bug #18410
if not p.module.compileToCpp and optTinyRtti in p.config.globalOptions:
var tmp: TLoc
if mode == constructRefObj:
let objType = t.skipTypes(abstractInst+{tyRef})
rawConstExpr(p, newNodeIT(nkType, a.lode.info, objType), tmp)
linefmt(p, cpsStmts,
"#nimCopyMem((void*)$1, (NIM_CONST void*)&$2, sizeof($3));$n",
[rdLoc(a), rdLoc(tmp), getTypeDesc(p.module, objType, mapTypeChooser(a))])
else:
rawConstExpr(p, newNodeIT(nkType, a.lode.info, t), tmp)
genAssignment(p, a, tmp, {})
else:
# worst case for performance:
var r = if mode == constructObj: addrLoc(p.config, a) else: rdLoc(a)
linefmt(p, section, "#objectInit($1, $2);$n", [r, genTypeInfoV1(p.module, t, a.lode.info)])
if isException(t):
var r = rdLoc(a)
if mode == constructRefObj: r = "(*$1)" % [r]
var s = skipTypes(t, abstractInst)
if not p.module.compileToCpp:
while s.kind == tyObject and s[0] != nil and s.sym.magic != mException:
r.add(".Sup")
s = skipTypes(s[0], skipPtrs)
linefmt(p, section, "$1.name = $2;$n", [r, makeCString(t.skipTypes(abstractInst).sym.name.s)])
proc genRefAssign(p: BProc, dest, src: TLoc)
proc isComplexValueType(t: PType): bool {.inline.} =
let t = t.skipTypes(abstractInst + tyUserTypeClasses)
result = t.kind in {tyArray, tySet, tyTuple, tyObject, tyOpenArray} or
(t.kind == tyProc and t.callConv == ccClosure)
include ccgreset
proc resetLoc(p: BProc, loc: var TLoc) =
let containsGcRef = optSeqDestructors notin p.config.globalOptions and containsGarbageCollectedRef(loc.t)
let typ = skipTypes(loc.t, abstractVarRange)
if isImportedCppType(typ): return
if optSeqDestructors in p.config.globalOptions and typ.kind in {tyString, tySequence}:
assert rdLoc(loc) != nil
let atyp = skipTypes(loc.t, abstractInst)
if atyp.kind in {tyVar, tyLent}:
linefmt(p, cpsStmts, "$1->len = 0; $1->p = NIM_NIL;$n", [rdLoc(loc)])
else:
linefmt(p, cpsStmts, "$1.len = 0; $1.p = NIM_NIL;$n", [rdLoc(loc)])
elif not isComplexValueType(typ):
if containsGcRef:
var nilLoc: TLoc
initLoc(nilLoc, locTemp, loc.lode, OnStack)
nilLoc.r = rope("NIM_NIL")
genRefAssign(p, loc, nilLoc)
else:
linefmt(p, cpsStmts, "$1 = 0;$n", [rdLoc(loc)])
else:
if loc.storage != OnStack and containsGcRef:
specializeReset(p, loc)
when false:
linefmt(p, cpsStmts, "#genericReset((void*)$1, $2);$n",
[addrLoc(p.config, loc), genTypeInfoV1(p.module, loc.t, loc.lode.info)])
# XXX: generated reset procs should not touch the m_type
# field, so disabling this should be safe:
genObjectInit(p, cpsStmts, loc.t, loc, constructObj)
else:
# array passed as argument decayed into pointer, bug #7332
# so we use getTypeDesc here rather than rdLoc(loc)
linefmt(p, cpsStmts, "#nimZeroMem((void*)$1, sizeof($2));$n",
[addrLoc(p.config, loc),
getTypeDesc(p.module, loc.t, mapTypeChooser(loc))])
# XXX: We can be extra clever here and call memset only
# on the bytes following the m_type field?
genObjectInit(p, cpsStmts, loc.t, loc, constructObj)
proc constructLoc(p: BProc, loc: var TLoc, isTemp = false) =
let typ = loc.t
if optSeqDestructors in p.config.globalOptions and skipTypes(typ, abstractInst + {tyStatic}).kind in {tyString, tySequence}:
linefmt(p, cpsStmts, "$1.len = 0; $1.p = NIM_NIL;$n", [rdLoc(loc)])
elif not isComplexValueType(typ):
linefmt(p, cpsStmts, "$1 = ($2)0;$n", [rdLoc(loc),
getTypeDesc(p.module, typ, mapTypeChooser(loc))])
else:
if not isTemp or containsGarbageCollectedRef(loc.t):
# don't use nimZeroMem for temporary values for performance if we can
# avoid it:
if not isImportedCppType(typ):
linefmt(p, cpsStmts, "#nimZeroMem((void*)$1, sizeof($2));$n",
[addrLoc(p.config, loc), getTypeDesc(p.module, typ, mapTypeChooser(loc))])
genObjectInit(p, cpsStmts, loc.t, loc, constructObj)
proc initLocalVar(p: BProc, v: PSym, immediateAsgn: bool) =
if sfNoInit notin v.flags:
# we know it is a local variable and thus on the stack!
# If ``not immediateAsgn`` it is not initialized in a binding like
# ``var v = X`` and thus we need to init it.
# If ``v`` contains a GC-ref we may pass it to ``unsureAsgnRef`` somehow
# which requires initialization. However this can really only happen if
# ``var v = X()`` gets transformed into ``X(&v)``.
# Nowadays the logic in ccgcalls deals with this case however.
if not immediateAsgn:
constructLoc(p, v.loc)
proc getTemp(p: BProc, t: PType, result: var TLoc; needsInit=false) =
inc(p.labels)
result.r = "T" & rope(p.labels) & "_"
linefmt(p, cpsLocals, "$1 $2;$n", [getTypeDesc(p.module, t, skVar), result.r])
result.k = locTemp
result.lode = lodeTyp t
result.storage = OnStack
result.flags = {}
constructLoc(p, result, not needsInit)
when false:
# XXX Introduce a compiler switch in order to detect these easily.
if getSize(p.config, t) > 1024 * 1024:
if p.prc != nil:
echo "ENORMOUS TEMPORARY! ", p.config $ p.prc.info
else:
echo "ENORMOUS TEMPORARY! ", p.config $ p.lastLineInfo
writeStackTrace()
proc getTempCpp(p: BProc, t: PType, result: var TLoc; value: Rope) =
inc(p.labels)
result.r = "T" & rope(p.labels) & "_"
linefmt(p, cpsStmts, "$1 $2 = $3;$n", [getTypeDesc(p.module, t, skVar), result.r, value])
result.k = locTemp
result.lode = lodeTyp t
result.storage = OnStack
result.flags = {}
proc getIntTemp(p: BProc, result: var TLoc) =
inc(p.labels)
result.r = "T" & rope(p.labels) & "_"
linefmt(p, cpsLocals, "NI $1;$n", [result.r])
result.k = locTemp
result.storage = OnStack
result.lode = lodeTyp getSysType(p.module.g.graph, unknownLineInfo, tyInt)
result.flags = {}
proc localVarDecl(p: BProc; n: PNode): Rope =
let s = n.sym
if s.loc.k == locNone:
fillLoc(s.loc, locLocalVar, n, mangleLocalName(p, s), OnStack)
if s.kind == skLet: incl(s.loc.flags, lfNoDeepCopy)
if s.kind in {skLet, skVar, skField, skForVar} and s.alignment > 0:
result.addf("NIM_ALIGN($1) ", [rope(s.alignment)])
result.add getTypeDesc(p.module, s.typ, skVar)
if s.constraint.isNil:
if sfRegister in s.flags: result.add(" register")
#elif skipTypes(s.typ, abstractInst).kind in GcTypeKinds:
# decl.add(" GC_GUARD")
if sfVolatile in s.flags: result.add(" volatile")
if sfNoalias in s.flags: result.add(" NIM_NOALIAS")
result.add(" ")
result.add(s.loc.r)
else:
result = runtimeFormat(s.cgDeclFrmt, [result, s.loc.r])
proc assignLocalVar(p: BProc, n: PNode) =
#assert(s.loc.k == locNone) # not yet assigned
# this need not be fulfilled for inline procs; they are regenerated
# for each module that uses them!
let nl = if optLineDir in p.config.options: "" else: "\L"
let decl = localVarDecl(p, n) & ";" & nl
line(p, cpsLocals, decl)
include ccgthreadvars
proc varInDynamicLib(m: BModule, sym: PSym)
proc treatGlobalDifferentlyForHCR(m: BModule, s: PSym): bool =
return m.hcrOn and {sfThread, sfGlobal} * s.flags == {sfGlobal} and
({lfNoDecl, lfHeader} * s.loc.flags == {})
# and s.owner.kind == skModule # owner isn't always a module (global pragma on local var)
# and s.loc.k == locGlobalVar # loc isn't always initialized when this proc is used
proc assignGlobalVar(p: BProc, n: PNode; value: Rope) =
let s = n.sym
if s.loc.k == locNone:
fillLoc(s.loc, locGlobalVar, n, mangleName(p.module, s), OnHeap)
if treatGlobalDifferentlyForHCR(p.module, s): incl(s.loc.flags, lfIndirect)
if lfDynamicLib in s.loc.flags:
var q = findPendingModule(p.module, s)
if q != nil and not containsOrIncl(q.declaredThings, s.id):
varInDynamicLib(q, s)
else:
s.loc.r = mangleDynLibProc(s)
if value != nil:
internalError(p.config, n.info, ".dynlib variables cannot have a value")
return
useHeader(p.module, s)
if lfNoDecl in s.loc.flags: return
if not containsOrIncl(p.module.declaredThings, s.id):
if sfThread in s.flags:
declareThreadVar(p.module, s, sfImportc in s.flags)
if value != nil:
internalError(p.config, n.info, ".threadvar variables cannot have a value")
else:
var decl: Rope = nil
var td = getTypeDesc(p.module, s.loc.t, skVar)
if s.constraint.isNil:
if s.kind in {skLet, skVar, skField, skForVar} and s.alignment > 0:
decl.addf "NIM_ALIGN($1) ", [rope(s.alignment)]
if p.hcrOn: decl.add("static ")
elif sfImportc in s.flags: decl.add("extern ")
elif lfExportLib in s.loc.flags: decl.add("N_LIB_EXPORT_VAR ")
else: decl.add("N_LIB_PRIVATE ")
if s.kind == skLet and value != nil: decl.add("NIM_CONST ")
decl.add(td)
if p.hcrOn: decl.add("*")
if sfRegister in s.flags: decl.add(" register")
if sfVolatile in s.flags: decl.add(" volatile")
if sfNoalias in s.flags: decl.add(" NIM_NOALIAS")
if value != nil:
decl.addf(" $1 = $2;$n", [s.loc.r, value])
else:
decl.addf(" $1;$n", [s.loc.r])
else:
if value != nil:
decl = runtimeFormat(s.cgDeclFrmt & " = $#;$n", [td, s.loc.r, value])
else:
decl = runtimeFormat(s.cgDeclFrmt & ";$n", [td, s.loc.r])
p.module.s[cfsVars].add(decl)
if p.withinLoop > 0 and value == nil:
# fixes tests/run/tzeroarray:
resetLoc(p, s.loc)
proc assignParam(p: BProc, s: PSym, retType: PType) =
assert(s.loc.r != nil)
scopeMangledParam(p, s)
proc fillProcLoc(m: BModule; n: PNode) =
let sym = n.sym
if sym.loc.k == locNone:
fillLoc(sym.loc, locProc, n, mangleName(m, sym), OnStack)
proc getLabel(p: BProc): TLabel =
inc(p.labels)
result = "LA" & rope(p.labels) & "_"
proc fixLabel(p: BProc, labl: TLabel) =
lineF(p, cpsStmts, "$1: ;$n", [labl])
proc genVarPrototype(m: BModule, n: PNode)
proc requestConstImpl(p: BProc, sym: PSym)
proc genStmts(p: BProc, t: PNode)
proc expr(p: BProc, n: PNode, d: var TLoc)
proc genProcPrototype(m: BModule, sym: PSym)
proc putLocIntoDest(p: BProc, d: var TLoc, s: TLoc)
proc intLiteral(i: BiggestInt): Rope
proc genLiteral(p: BProc, n: PNode): Rope
proc genOtherArg(p: BProc; ri: PNode; i: int; typ: PType): Rope
proc raiseExit(p: BProc)
proc initLocExpr(p: BProc, e: PNode, result: var TLoc) =
initLoc(result, locNone, e, OnUnknown)
expr(p, e, result)
proc initLocExprSingleUse(p: BProc, e: PNode, result: var TLoc) =
initLoc(result, locNone, e, OnUnknown)
if e.kind in nkCallKinds and (e[0].kind != nkSym or e[0].sym.magic == mNone):
# We cannot check for tfNoSideEffect here because of mutable parameters.
discard "bug #8202; enforce evaluation order for nested calls for C++ too"
# We may need to consider that 'f(g())' cannot be rewritten to 'tmp = g(); f(tmp)'
# if 'tmp' lacks a move/assignment operator.
if e[0].kind == nkSym and sfCompileToCpp in e[0].sym.flags:
result.flags.incl lfSingleUse
else:
result.flags.incl lfSingleUse
expr(p, e, result)
include ccgcalls, "ccgstmts.nim"
proc initFrame(p: BProc, procname, filename: Rope): Rope =
const frameDefines = """
$1 define nimfr_(proc, file) \
TFrame FR_; \
FR_.procname = proc; FR_.filename = file; FR_.line = 0; FR_.len = 0; #nimFrame(&FR_);
$1 define nimfrs_(proc, file, slots, length) \
struct {TFrame* prev;NCSTRING procname;NI line;NCSTRING filename; NI len; VarSlot s[slots];} FR_; \
FR_.procname = proc; FR_.filename = file; FR_.line = 0; FR_.len = length; #nimFrame((TFrame*)&FR_);
$1 define nimln_(n, file) \
FR_.line = n; FR_.filename = file;
"""
if p.module.s[cfsFrameDefines].len == 0:
appcg(p.module, p.module.s[cfsFrameDefines], frameDefines, ["#"])
discard cgsym(p.module, "nimFrame")
result = ropecg(p.module, "\tnimfr_($1, $2);$n", [procname, filename])
proc initFrameNoDebug(p: BProc; frame, procname, filename: Rope; line: int): Rope =
discard cgsym(p.module, "nimFrame")
p.blocks[0].sections[cpsLocals].addf("TFrame $1;$n", [frame])
result = ropecg(p.module, "\t$1.procname = $2; $1.filename = $3; " &
" $1.line = $4; $1.len = -1; nimFrame(&$1);$n",
[frame, procname, filename, line])
proc deinitFrameNoDebug(p: BProc; frame: Rope): Rope =
result = ropecg(p.module, "\t#popFrameOfAddr(&$1);$n", [frame])
proc deinitFrame(p: BProc): Rope =
result = ropecg(p.module, "\t#popFrame();$n", [])
include ccgexprs
# ----------------------------- dynamic library handling -----------------
# We don't finalize dynamic libs as the OS does this for us.
proc isGetProcAddr(lib: PLib): bool =
let n = lib.path
result = n.kind in nkCallKinds and n.typ != nil and
n.typ.kind in {tyPointer, tyProc}
proc loadDynamicLib(m: BModule, lib: PLib) =
assert(lib != nil)
if not lib.generated:
lib.generated = true
var tmp = getTempName(m)
assert(lib.name == nil)
lib.name = tmp # BUGFIX: cgsym has awful side-effects
m.s[cfsVars].addf("static void* $1;$n", [tmp])
if lib.path.kind in {nkStrLit..nkTripleStrLit}:
var s: TStringSeq = @[]
libCandidates(lib.path.strVal, s)
localReport(m.config, reportStr(
rsemHintLibDependency, lib.path.strVal))
var loadlib: Rope = nil
for i in 0..high(s):
inc(m.labels)
if i > 0: loadlib.add("||")
let n = newStrNode(nkStrLit, s[i])
n.info = lib.path.info
appcg(m, loadlib, "($1 = #nimLoadLibrary($2))$n",
[tmp, genStringLiteral(m, n)])
appcg(m, m.s[cfsDynLibInit],
"if (!($1)) #nimLoadLibraryError($2);$n",
[loadlib, genStringLiteral(m, lib.path)])
else:
var p = newProc(nil, m)
p.options.excl optStackTrace
p.flags.incl nimErrorFlagDisabled
var dest: TLoc
initLoc(dest, locTemp, lib.path, OnStack)
dest.r = getTempName(m)
appcg(m, m.s[cfsDynLibInit],"$1 $2;$n",
[getTypeDesc(m, lib.path.typ, skVar), rdLoc(dest)])
expr(p, lib.path, dest)
m.s[cfsVars].add(p.s(cpsLocals))
m.s[cfsDynLibInit].add(p.s(cpsInit))
m.s[cfsDynLibInit].add(p.s(cpsStmts))
appcg(m, m.s[cfsDynLibInit],
"if (!($1 = #nimLoadLibrary($2))) #nimLoadLibraryError($2);$n",
[tmp, rdLoc(dest)])
if lib.name == nil: internalError(m.config, "loadDynamicLib")
proc mangleDynLibProc(sym: PSym): Rope =
# we have to build this as a single rope in order not to trip the
# optimization in genInfixCall, see test tests/cpp/t8241.nim
if sfCompilerProc in sym.flags:
# NOTE: sym.loc.r is the external name!
result = rope(sym.name.s)
else:
result = rope(strutils.`%`("Dl_$1_", $sym.id))
proc symInDynamicLib(m: BModule, sym: PSym) =
var lib = sym.annex
let isCall = isGetProcAddr(lib)
var extname = sym.loc.r
if not isCall: loadDynamicLib(m, lib)
var tmp = mangleDynLibProc(sym)
sym.loc.r = tmp # from now on we only need the internal name
sym.typ.sym = nil # generate a new name
inc(m.labels, 2)
if isCall:
let n = lib.path
var a: TLoc
initLocExpr(m.initProc, n[0], a)
var params = rdLoc(a) & "("
for i in 1..<n.len-1:
initLocExpr(m.initProc, n[i], a)
params.add(rdLoc(a))
params.add(", ")
let load = "\t$1 = ($2) ($3$4));$n" %
[tmp, getTypeDesc(m, sym.typ, skVar), params, makeCString($extname)]
var last = lastSon(n)
if last.kind == nkHiddenStdConv: last = last[1]
internalAssert(m.config, last.kind == nkStrLit)
let idx = last.strVal
if idx.len == 0:
m.initProc.s(cpsStmts).add(load)
elif idx.len == 1 and idx[0] in {'0'..'9'}:
m.extensionLoaders[idx[0]].add(load)
else:
internalError(m.config, sym.info, "wrong index: " & idx)
else:
appcg(m, m.s[cfsDynLibInit],
"\t$1 = ($2) #nimGetProcAddr($3, $4);$n",
[tmp, getTypeDesc(m, sym.typ, skVar), lib.name, makeCString($extname)])
m.s[cfsVars].addf("$2 $1;$n", [sym.loc.r, getTypeDesc(m, sym.loc.t, skVar)])
proc varInDynamicLib(m: BModule, sym: PSym) =
var lib = sym.annex
var extname = sym.loc.r
loadDynamicLib(m, lib)
incl(sym.loc.flags, lfIndirect)
var tmp = mangleDynLibProc(sym)
sym.loc.r = tmp # from now on we only need the internal name
inc(m.labels, 2)
appcg(m, m.s[cfsDynLibInit],
"$1 = ($2*) #nimGetProcAddr($3, $4);$n",
[tmp, getTypeDesc(m, sym.typ, skVar), lib.name, makeCString($extname)])
m.s[cfsVars].addf("$2* $1;$n",
[sym.loc.r, getTypeDesc(m, sym.loc.t, skVar)])
proc symInDynamicLibPartial(m: BModule, sym: PSym) =
sym.loc.r = mangleDynLibProc(sym)
sym.typ.sym = nil # generate a new name
proc cgsym(m: BModule, name: string): Rope =
let sym = magicsys.getCompilerProc(m.g.graph, name)
if sym != nil:
case sym.kind
of skProc, skFunc, skMethod, skConverter, skIterator: genProc(m, sym)
of skVar, skResult, skLet: genVarPrototype(m, newSymNode sym)
of skType: discard getTypeDesc(m, sym.typ)
else: internalError(m.config, "cgsym: " & name & ": " & $sym.kind)
else:
# we used to exclude the system module from this check, but for DLL
# generation support this sloppyness leads to hard to detect bugs, so
# we're picky here for the system module too:
localReport(m.config, reportStr(rsemSystemNeeds, name))
result = sym.loc.r
if m.hcrOn and sym != nil and sym.kind in {skProc..skIterator}:
result.addActualSuffixForHCR(m.module, sym)
proc generateHeaders(m: BModule) =
m.s[cfsHeaders].add("\L#include \"nimbase.h\"\L")
for it in m.headerFiles:
if it[0] == '#':
m.s[cfsHeaders].add(rope(it.replace('`', '"') & "\L"))
elif it[0] notin {'"', '<'}:
m.s[cfsHeaders].addf("#include \"$1\"$N", [rope(it)])
else:
m.s[cfsHeaders].addf("#include $1$N", [rope(it)])
m.s[cfsHeaders].add("""#undef LANGUAGE_C
#undef MIPSEB
#undef MIPSEL
#undef PPC
#undef R3000
#undef R4000
#undef i386
#undef linux
#undef mips
#undef near
#undef far
#undef powerpc
#undef unix
""")
proc openNamespaceNim(namespace: string): Rope =
result.add("namespace ")
result.add(namespace)
result.add(" {\L")
proc closeNamespaceNim(): Rope =
result.add("}\L")
proc closureSetup(p: BProc, prc: PSym) =
if tfCapturesEnv notin prc.typ.flags: return
# prc.ast[paramsPos].last contains the type we're after:
var ls = lastSon(prc.ast[paramsPos])
if ls.kind != nkSym:
internalError(p.config, prc.info, "closure generation failed")
var env = ls.sym
#echo "created environment: ", env.id, " for ", prc.name.s
assignLocalVar(p, ls)
# generate cast assignment:
if p.config.selectedGC == gcGo:
linefmt(p, cpsStmts, "#unsureAsgnRef((void**) $1, ($2) ClE_0);$n",
[addrLoc(p.config, env.loc), getTypeDesc(p.module, env.typ)])
else:
linefmt(p, cpsStmts, "$1 = ($2) ClE_0;$n",
[rdLoc(env.loc), getTypeDesc(p.module, env.typ)])
proc containsResult(n: PNode): bool =
result = false
case n.kind
of nkEmpty..pred(nkSym), succ(nkSym)..nkNilLit, nkFormalParams:
discard
of nkSym:
if n.sym.kind == skResult:
result = true
else:
for i in 0..<n.len:
if containsResult(n[i]): return true
const harmless = {nkConstSection, nkTypeSection, nkEmpty, nkCommentStmt, nkTemplateDef,
nkMacroDef, nkMixinStmt, nkBindStmt} +
declarativeDefs
proc easyResultAsgn(n: PNode): PNode =
case n.kind
of nkStmtList, nkStmtListExpr:
var i = 0
while i < n.len and n[i].kind in harmless: inc i
if i < n.len: result = easyResultAsgn(n[i])
of nkAsgn, nkFastAsgn:
if n[0].kind == nkSym and n[0].sym.kind == skResult and not containsResult(n[1]):
incl n.flags, nfPreventCg
return n[1]
of nkReturnStmt:
if n.len > 0:
result = easyResultAsgn(n[0])
if result != nil: incl n.flags, nfPreventCg
else: discard
type
InitResultEnum = enum Unknown, InitSkippable, InitRequired
proc allPathsAsgnResult(n: PNode): InitResultEnum =
# Exceptions coming from calls don't have not be considered here:
#
# proc bar(): string = raise newException(...)
#
# proc foo(): string =
# # optimized out: 'reset(result)'
# result = bar()
#
# try:
# a = foo()
# except:
# echo "a was not written to"
#
template allPathsInBranch(it) =
let a = allPathsAsgnResult(it)
case a
of InitRequired: return InitRequired
of InitSkippable: discard
of Unknown:
# sticky, but can be overwritten by InitRequired:
result = Unknown
result = Unknown
case n.kind
of nkStmtList, nkStmtListExpr:
for it in n:
result = allPathsAsgnResult(it)
if result != Unknown: return result
of nkAsgn, nkFastAsgn:
if n[0].kind == nkSym and n[0].sym.kind == skResult:
if not containsResult(n[1]): result = InitSkippable
else: result = InitRequired
elif containsResult(n):
result = InitRequired
of nkReturnStmt:
if n.len > 0:
if n[0].kind == nkEmpty and result != InitSkippable:
# This is a bare `return` statement, if `result` was not initialized
# anywhere else (or if we're not sure about this) let's require it to be
# initialized. This avoids cases like #9286 where this heuristic lead to
# wrong code being generated.
result = InitRequired
else: result = allPathsAsgnResult(n[0])
of nkIfStmt, nkIfExpr:
var exhaustive = false
result = InitSkippable
for it in n:
# Every condition must not use 'result':
if it.len == 2 and containsResult(it[0]):
return InitRequired
if it.len == 1: exhaustive = true
allPathsInBranch(it.lastSon)
# if the 'if' statement is not exhaustive and yet it touched 'result'
# in some way, say Unknown.
if not exhaustive: result = Unknown
of nkCaseStmt:
if containsResult(n[0]): return InitRequired
result = InitSkippable