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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.
#
# This module declares some helpers for the C code generator.
import
ast, types, msgs, wordrecg,
platform, trees, options, cgendata, mangleutils
import std/[hashes, strutils, formatfloat]
when defined(nimPreviewSlimSystem):
import std/assertions
proc getPragmaStmt*(n: PNode, w: TSpecialWord): PNode =
case n.kind
of nkStmtList:
result = nil
for i in 0..<n.len:
result = getPragmaStmt(n[i], w)
if result != nil: break
of nkPragma:
result = nil
for i in 0..<n.len:
if whichPragma(n[i]) == w: return n[i]
else:
result = nil
proc stmtsContainPragma*(n: PNode, w: TSpecialWord): bool =
result = getPragmaStmt(n, w) != nil
proc hashString*(conf: ConfigRef; s: string): BiggestInt =
# has to be the same algorithm as strmantle.hashString!
if CPU[conf.target.targetCPU].bit == 64:
# we have to use the same bitwidth
# as the target CPU
var b = 0'u64
for i in 0..<s.len:
b = b + uint(s[i])
b = b + (b shl 10)
b = b xor (b shr 6)
b = b + (b shl 3)
b = b xor (b shr 11)
b = b + (b shl 15)
result = cast[Hash](b)
else:
var a = 0'u32
for i in 0..<s.len:
a = a + uint32(s[i])
a = a + (a shl 10)
a = a xor (a shr 6)
a = a + (a shl 3)
a = a xor (a shr 11)
a = a + (a shl 15)
result = cast[Hash](uint(a))
template getUniqueType*(key: PType): PType = key
proc makeSingleLineCString*(s: string): string =
result = "\""
for c in items(s):
c.toCChar(result)
result.add('\"')
proc mapSetType(conf: ConfigRef; typ: PType): TCTypeKind =
case int(getSize(conf, typ))
of 1: result = ctInt8
of 2: result = ctInt16
of 4: result = ctInt32
of 8: result = ctInt64
else: result = ctArray
proc ccgIntroducedPtr*(conf: ConfigRef; s: PSym, retType: PType): bool =
var pt = skipTypes(s.typ, typedescInst)
assert skResult != s.kind
#note precedence: params override types
if optByRef in s.options: return true
elif sfByCopy in s.flags: return false
elif tfByRef in pt.flags: return true
elif tfByCopy in pt.flags: return false
case pt.kind
of tyObject:
if s.typ.sym != nil and sfForward in s.typ.sym.flags:
# forwarded objects are *always* passed by pointers for consistency!
result = true
elif s.typ.kind == tySink and conf.selectedGC notin {gcArc, gcAtomicArc, gcOrc, gcHooks}:
# bug #23354:
result = false
elif (optByRef in s.options) or (getSize(conf, pt) > conf.target.floatSize * 3):
result = true # requested anyway
elif (tfFinal in pt.flags) and (pt[0] == nil):
result = false # no need, because no subtyping possible
else:
result = true # ordinary objects are always passed by reference,
# otherwise casting doesn't work
of tyTuple:
result = (getSize(conf, pt) > conf.target.floatSize*3) or (optByRef in s.options)
else:
result = false
# first parameter and return type is 'lent T'? --> use pass by pointer
if s.position == 0 and retType != nil and retType.kind == tyLent:
result = not (pt.kind in {tyVar, tyArray, tyOpenArray, tyVarargs, tyRef, tyPtr, tyPointer} or
pt.kind == tySet and mapSetType(conf, pt) == ctArray)
proc encodeName*(name: string): string =
result = mangle(name)
result = $result.len & result
proc makeUnique(m: BModule; s: PSym, name: string = ""): string =
result = if name == "": s.name.s else: name
result.add "__"
result.add m.g.graph.ifaces[s.itemId.module].uniqueName
result.add "_u"
result.add $s.itemId.item
proc encodeSym*(m: BModule; s: PSym; makeUnique: bool = false): string =
#Module::Type
var name = s.name.s
if makeUnique:
name = makeUnique(m, s, name)
"N" & encodeName(s.skipGenericOwner.name.s) & encodeName(name) & "E"
proc encodeType*(m: BModule; t: PType): string =
result = ""
var kindName = ($t.kind)[2..^1]
kindName[0] = toLower($kindName[0])[0]
case t.kind
of tyObject, tyEnum, tyDistinct, tyUserTypeClass, tyGenericParam:
result = encodeSym(m, t.sym)
of tyGenericInst, tyUserTypeClassInst, tyGenericBody:
result = encodeName(t[0].sym.name.s)
result.add "I"
for i in 1..<t.len - 1:
result.add encodeType(m, t[i])
result.add "E"
of tySequence, tyOpenArray, tyArray, tyVarargs, tyTuple, tyProc, tySet, tyTypeDesc,
tyPtr, tyRef, tyVar, tyLent, tySink, tyStatic, tyUncheckedArray, tyOr, tyAnd, tyBuiltInTypeClass:
result =
case t.kind:
of tySequence: encodeName("seq")
else: encodeName(kindName)
result.add "I"
for i in 0..<t.len:
let s = t[i]
if s.isNil: continue
result.add encodeType(m, s)
result.add "E"
of tyRange:
var val = "range_"
if t.n[0].typ.kind in {tyFloat..tyFloat128}:
val.addFloat t.n[0].floatVal
val.add "_"
val.addFloat t.n[1].floatVal
else:
val.add $t.n[0].intVal & "_" & $t.n[1].intVal
result = encodeName(val)
of tyString..tyUInt64, tyPointer, tyBool, tyChar, tyVoid, tyAnything, tyNil, tyEmpty:
result = encodeName(kindName)
of tyAlias, tyInferred, tyOwned:
result = encodeType(m, t.elementType)
else:
assert false, "encodeType " & $t.kind
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