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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
ast, astalgo, hashes, trees, platform, magicsys, extccomp, options, intsets,
nversion, nimsets, msgs, bitsets, idents, types,
ccgutils, os, ropes, math, wordrecg, treetab, cgmeth,
rodutils, renderer, cgendata, aliases,
lowerings, tables, sets, ndi, lineinfos, pathutils, transf,
injectdestructors, astmsgs, modulepaths, backendpragmas
import pipelineutils
when defined(nimPreviewSlimSystem):
import std/assertions
when not defined(leanCompiler):
import spawn, semparallel
import strutils except `%`, addf # 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 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 =
# TODO fixme
if m.config.symbolFiles == v2Sf:
let ms = s.itemId.module #getModule(s)
result = m.g.modules[ms]
else:
var ms = getModule(s)
result = m.g.modules[ms.position]
proc initLoc(result: var TLoc, k: TLocKind, lode: PNode, s: TStorageLoc, flags: TLocFlags = {}) =
result.k = k
result.storage = s
result.lode = lode
result.r = ""
result.flags = flags
proc fillLoc(a: var TLoc, k: TLocKind, lode: PNode, r: Rope, s: TStorageLoc) {.inline.} =
# 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 == "": a.r = r
proc fillLoc(a: var TLoc, k: TLocKind, lode: PNode, s: TStorageLoc) {.inline.} =
# fills the loc if it is not already initialized
if a.k == locNone:
a.k = k
a.lode = lode
a.storage = s
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)
proc cgsymValue(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: 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 '^':
flushStrLit()
inc(i)
result.add newCall(formatValue, resVar, args[^1])
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 $" & frmt[i])
elif frmt[i] == '#' and frmt[i+1] in IdentStartChars:
inc(i)
var j = i
while frmt[j] in IdentChars: inc(j)
var ident = newLit(substr(frmt, i, j-1))
i = j
flushStrLit()
result.add newCall(formatValue, resVar, newCall(ident"cgsymValue", m, ident))
elif frmt[i] == '#' and frmt[i+1] == '$':
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"cgsymValue", m, ident))
elif frmt[i] == '#' and frmt[i+1] == '#':
inc(i, 2)
strLit.add("#")
else:
strLit.add(frmt[i])
inc(i)
flushStrLit()
result.add newCall(ident"rope", resVar)
proc addIndent(p: BProc; result: var Rope) =
var i = result.len
let newLen = i + p.blocks.len
result.setLen newLen
while i < newLen:
result[i] = '\t'
inc i
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: string) =
addIndent p, p.s(sec)
p.s(sec).add(r)
template lineF(p: BProc, sec: TCProcSection, frmt: FormatStr,
args: untyped) =
addIndent p, p.s(sec)
p.s(sec).add(frmt % args)
template lineCg(p: BProc, sec: TCProcSection, frmt: FormatStr,
args: untyped) =
addIndent p, p.s(sec)
p.s(sec).add(ropecg(p.module, frmt, args))
template linefmt(p: BProc, sec: TCProcSection, frmt: FormatStr,
args: untyped) =
addIndent p, p.s(sec)
p.s(sec).add(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, filename: string, line: int; p: BProc; info: TLineInfo; lastFileIndex: FileIndex) =
assert line >= 0
if optLineDir in p.config.options and line > 0:
if lastFileIndex == info.fileIndex:
r.addf("\n#line $1\n", [rope(line)])
else:
r.addf("\n#line $2 $1\n",
[rope(makeSingleLineCString(filename)), rope(line)])
proc genCLineDir(r: var Rope, info: TLineInfo; conf: ConfigRef) =
if optLineDir in conf.options:
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 genCLineDir(r: var Rope, p: BProc, info: TLineInfo; conf: ConfigRef) =
if optLineDir in conf.options:
let lastFileIndex = p.lastLineInfo.fileIndex
if freshLineInfo(p, info):
genCLineDir(r, toFullPath(conf, info), info.safeLineNm, p, info, lastFileIndex)
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")
let lastFileIndex = p.lastLineInfo.fileIndex
let freshLine = freshLineInfo(p, t.info)
if freshLine:
genCLineDir(p.s(cpsStmts), toFullPath(p.config, t.info), line, p, t.info, lastFileIndex)
if ({optLineTrace, optStackTrace} * p.options == {optLineTrace, optStackTrace}) and
(p.prc == nil or sfPure notin p.prc.flags) and t.info.fileIndex != InvalidFileIdx:
if freshLine:
if lastFileIndex == t.info.fileIndex:
linefmt(p, cpsStmts, "nimln_($1);\n",
[line])
else:
linefmt(p, cpsStmts, "nimlf_($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; result: var 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)
if lfIndirect in a.flags:
result = "(*" & a.r & ")"
else:
result = a.r
proc addRdLoc(a: TLoc; result: var Rope) =
if lfIndirect in a.flags:
result.add "(*" & a.r & ")"
else:
result.add a.r
proc lenField(p: BProc): Rope {.inline.} =
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 dataFieldAccessor(p: BProc, sym: Rope): Rope =
if optSeqDestructors in p.config.globalOptions:
result = "(" & sym & ").p"
else:
result = sym
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 addAddrLoc(conf: ConfigRef; a: TLoc; result: var Rope) =
if lfIndirect notin a.flags and mapType(conf, a.t, mapTypeChooser(a) == skParam) != ctArray:
result.add "(&" & a.r & ")"
else:
result.add a.r
proc addrLoc(conf: ConfigRef; a: TLoc): Rope =
if lfIndirect notin a.flags and mapType(conf, a.t, mapTypeChooser(a) == skParam) != ctArray:
result = "(&" & a.r & ")"
else:
result = a.r
proc byRefLoc(p: BProc; a: TLoc): Rope =
if lfIndirect notin a.flags and mapType(p.config, a.t, mapTypeChooser(a) == skParam) != ctArray and not
p.module.compileToCpp:
result = "(&" & a.r & ")"
else:
result = a.r
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:
if 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, descKindFromSymKind 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 loc.r != ""
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, descKindFromSymKind 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):
if containsGarbageCollectedRef(loc.t):
var nilLoc: TLoc
initLoc(nilLoc, locTemp, loc.lode, OnStack)
nilLoc.r = rope("NIM_NIL")
genRefAssign(p, loc, nilLoc)
else:
linefmt(p, cpsStmts, "$1 = ($2)0;$n", [rdLoc(loc),
getTypeDesc(p.module, typ, descKindFromSymKind 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 isOrHasImportedCppType(typ):
linefmt(p, cpsStmts, "#nimZeroMem((void*)$1, sizeof($2));$n",
[addrLoc(p.config, loc), getTypeDesc(p.module, typ, descKindFromSymKind 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) & "_"
if p.module.compileToCpp and isOrHasImportedCppType(t):
linefmt(p, cpsLocals, "$1 $2{};$n", [getTypeDesc(p.module, t, dkVar), result.r])
else:
linefmt(p, cpsLocals, "$1 $2;$n", [getTypeDesc(p.module, t, dkVar), 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, dkVar), 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:
fillLocalName(p, s)
fillLoc(s.loc, locLocalVar, n, 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)])
genCLineDir(result, p, n.info, p.config)
result.add getTypeDesc(p.module, s.typ, dkVar)
if sfCodegenDecl notin s.flags:
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: "\n"
let decl = localVarDecl(p, n) & (if p.module.compileToCpp and isOrHasImportedCppType(n.typ): "{};" else: ";") & 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 genGlobalVarDecl(p: BProc, n: PNode; td, value: Rope; decl: var Rope) =
let s = n.sym
if sfCodegenDecl notin s.flags:
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 != "": 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")
else:
if value != "":
decl = runtimeFormat(s.cgDeclFrmt & " = $#;$n", [td, s.loc.r, value])
else:
decl = runtimeFormat(s.cgDeclFrmt & ";$n", [td, s.loc.r])
proc genCppVarForCtor(p: BProc, v: PSym; vn, value: PNode; decl: var Rope)
proc callGlobalVarCppCtor(p: BProc; v: PSym; vn, value: PNode) =
let s = vn.sym
fillBackendName(p.module, s)
fillLoc(s.loc, locGlobalVar, vn, OnHeap)
var decl: Rope
let td = getTypeDesc(p.module, vn.sym.typ, dkVar)
genGlobalVarDecl(p, vn, td, "", decl)
decl.add " " & $s.loc.r
genCppVarForCtor(p, v, vn, value, decl)
p.module.s[cfsVars].add decl
proc assignGlobalVar(p: BProc, n: PNode; value: Rope) =
let s = n.sym
if s.loc.k == locNone:
fillBackendName(p.module, s)
fillLoc(s.loc, locGlobalVar, n, 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 != "":
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 != "":
internalError(p.config, n.info, ".threadvar variables cannot have a value")
else:
var decl: Rope = ""
let td = getTypeDesc(p.module, s.loc.t, dkVar)
genGlobalVarDecl(p, n, td, value, decl)
if s.constraint.isNil:
if value != "":
if p.module.compileToCpp and value.startsWith "{{}":
# TODO: taking this branch, re"\{\{\}(,\s\{\})*\}" might be emitted, resulting in
# either warnings (GCC 12.2+) or errors (Clang 15, MSVC 19.3+) of C++11+ compilers **when
# explicit constructors are around** due to overload resolution rules in place [^0][^1][^2]
# *Workaround* here: have C++'s static initialization mechanism do the default init work,
# for us lacking a deeper knowledge of an imported object's constructors' ex-/implicitness
# (so far) *and yet* trying to achieve default initialization.
# Still, generating {}s in genConstObjConstr() just to omit them here is faaaar from ideal;
# need to figure out a better way, possibly by keeping around more data about the
# imported objects' contructors?
#
# [^0]: https://en.cppreference.com/w/cpp/language/aggregate_initialization
# [^1]: https://cplusplus.github.io/CWG/issues/1518.html
# [^2]: https://eel.is/c++draft/over.match.ctor
decl.addf(" $1;$n", [s.loc.r])
else:
decl.addf(" $1 = $2;$n", [s.loc.r, value])
else:
decl.addf(" $1;$n", [s.loc.r])
p.module.s[cfsVars].add(decl)
if p.withinLoop > 0 and value == "":
# fixes tests/run/tzeroarray:
resetLoc(p, s.loc)
proc assignParam(p: BProc, s: PSym, retType: PType) =
assert(s.loc.r != "")
scopeMangledParam(p, s)
proc fillProcLoc(m: BModule; n: PNode) =
let sym = n.sym
if sym.loc.k == locNone:
fillBackendName(m, sym)
fillLoc(sym.loc, locProc, n, OnStack)
proc getLabel(p: BProc): TLabel =
inc(p.labels)
result = "LA" & rope(p.labels) & "_"
proc fixLabel(p: BProc, labl: TLabel) =
p.s(cpsStmts).add("$1: ;$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; result: var Rope)
proc genLiteral(p: BProc, n: PNode; result: var Rope)
proc genOtherArg(p: BProc; ri: PNode; i: int; typ: PType; result: var Rope; argsCounter: var int)
proc raiseExit(p: BProc)
proc initLocExpr(p: BProc, e: PNode, result: var TLoc, flags: TLocFlags = {}) =
initLoc(result, locNone, e, OnUnknown, flags)
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 = """
$1define nimfr_(proc, file) \
TFrame FR_; \
FR_.procname = proc; FR_.filename = file; FR_.line = 0; FR_.len = 0; #nimFrame(&FR_);
$1define 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_);
$1define nimln_(n) \
FR_.line = n;
$1define nimlf_(n, file) \
FR_.line = n; FR_.filename = file;
"""
if p.module.s[cfsFrameDefines].len == 0:
appcg(p.module, p.module.s[cfsFrameDefines], frameDefines, ["#"])
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 =
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 == "")
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)
rawMessage(m.config, hintDependency, lib.path.strVal)
var loadlib: Rope = ""
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, "($1 = #nimLoadLibrary(", [tmp])
genStringLiteral(m, n, loadlib)
loadlib.addf "))$n", []
appcg(m, m.s[cfsDynLibInit],
"if (!($1)) #nimLoadLibraryError(",
[loadlib])
genStringLiteral(m, lib.path, m.s[cfsDynLibInit])
m.s[cfsDynLibInit].addf ");$n", []
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, dkVar), 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 == "": 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, dkVar), 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, dkVar), lib.name, makeCString($extname)])
m.s[cfsVars].addf("$2 $1;$n", [sym.loc.r, getTypeDesc(m, sym.loc.t, dkVar)])
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, dkVar), lib.name, makeCString($extname)])
m.s[cfsVars].addf("$2* $1;$n",
[sym.loc.r, getTypeDesc(m, sym.loc.t, dkVar)])
proc symInDynamicLibPartial(m: BModule, sym: PSym) =
sym.loc.r = mangleDynLibProc(sym)
sym.typ.sym = nil # generate a new name
proc cgsymImpl(m: BModule; sym: PSym) {.inline.} =
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: " & $sym.kind)
proc cgsym(m: BModule, name: string) =
let sym = magicsys.getCompilerProc(m.g.graph, name)
if sym != nil:
cgsymImpl m, sym
else:
rawMessage(m.config, errGenerated, "system module needs: " & name)
proc cgsymValue(m: BModule, name: string): Rope =
let sym = magicsys.getCompilerProc(m.g.graph, name)
if sym != nil:
cgsymImpl m, sym
else:
rawMessage(m.config, errGenerated, "system module needs: " & 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) =
var nimbase = m.config.nimbasePattern
if nimbase == "": nimbase = "nimbase.h"
m.s[cfsHeaders].addf("\L#include \"$1\"\L", [nimbase])
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; result: var Rope) =
result.add("namespace ")
result.add(namespace)
result.add(" {\L")
proc closeNamespaceNim(result: var 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