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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, hashes, strutils, msgs, wordrecg,
platform, trees, options, cgendata
when defined(nimPreviewSlimSystem):
import std/assertions
proc getPragmaStmt*(n: PNode, w: TSpecialWord): PNode =
case n.kind
of nkStmtList:
for i in 0..<n.len:
result = getPragmaStmt(n[i], w)
if result != nil: break
of nkPragma:
for i in 0..<n.len:
if whichPragma(n[i]) == w: return n[i]
else: discard
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 mangle*(name: string): string =
result = newStringOfCap(name.len)
var start = 0
if name[0] in Digits:
result.add("X" & name[0])
start = 1
var requiresUnderscore = false
template special(x) =
result.add x
requiresUnderscore = true
for i in start..<name.len:
let c = name[i]
case c
of 'a'..'z', '0'..'9', 'A'..'Z':
result.add(c)
of '_':
# we generate names like 'foo_9' for scope disambiguations and so
# disallow this here:
if i > 0 and i < name.len-1 and name[i+1] in Digits:
discard
else:
result.add(c)
of '$': special "dollar"
of '%': special "percent"
of '&': special "amp"
of '^': special "roof"
of '!': special "emark"
of '?': special "qmark"
of '*': special "star"
of '+': special "plus"
of '-': special "minus"
of '/': special "slash"
of '\\': special "backslash"
of '=': special "eq"
of '<': special "lt"
of '>': special "gt"
of '~': special "tilde"
of ':': special "colon"
of '.': special "dot"
of '@': special "at"
of '|': special "bar"
else:
result.add("X" & toHex(ord(c), 2))
requiresUnderscore = true
if requiresUnderscore:
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
if 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 (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)
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