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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, astalgo, ropes, lists, hashes, strutils, types, msgs, wordrecg,
platform, trees
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*(s: string): BiggestInt =
# has to be the same algorithm as system.hashString!
if CPU[targetCPU].bit == 64:
# we have to use the same bitwidth
# as the target CPU
var b = 0'i64
for i in countup(0, len(s) - 1):
b = b +% ord(s[i])
b = b +% `shl`(b, 10)
b = b xor `shr`(b, 6)
b = b +% `shl`(b, 3)
b = b xor `shr`(b, 11)
b = b +% `shl`(b, 15)
result = b
else:
var a = 0'i32
for i in countup(0, len(s) - 1):
a = a +% ord(s[i]).int32
a = a +% `shl`(a, 10'i32)
a = a xor `shr`(a, 6'i32)
a = a +% `shl`(a, 3'i32)
a = a xor `shr`(a, 11'i32)
a = a +% `shl`(a, 15'i32)
result = a
var
gTypeTable: array[TTypeKind, TIdTable]
gCanonicalTypes: array[TTypeKind, PType]
proc initTypeTables() =
for i in countup(low(TTypeKind), high(TTypeKind)): initIdTable(gTypeTable[i])
proc resetCaches* =
## XXX: fix that more properly
initTypeTables()
for i in low(gCanonicalTypes)..high(gCanonicalTypes):
gCanonicalTypes[i] = nil
when false:
proc echoStats*() =
for i in countup(low(TTypeKind), high(TTypeKind)):
echo i, " ", gTypeTable[i].counter
proc slowSearch(key: PType; k: TTypeKind): PType =
# tuples are quite horrible as C does not support them directly and
# tuple[string, string] is a (strange) subtype of
# tuple[nameA, nameB: string]. This bites us here, so we
# use 'sameBackendType' instead of 'sameType'.
if idTableHasObjectAsKey(gTypeTable[k], key): return key
for h in countup(0, high(gTypeTable[k].data)):
var t = PType(gTypeTable[k].data[h].key)
if t != nil and sameBackendType(t, key):
return t
idTablePut(gTypeTable[k], key, key)
result = key
proc getUniqueType*(key: PType): PType =
# this is a hotspot in the compiler!
if key == nil: return
var k = key.kind
case k
of tyBool, tyChar, tyInt..tyUInt64:
# no canonicalization for integral types, so that e.g. ``pid_t`` is
# produced instead of ``NI``.
result = key
of tyEmpty, tyNil, tyExpr, tyStmt, tyPointer, tyString,
tyCString, tyNone, tyVoid:
result = gCanonicalTypes[k]
if result == nil:
gCanonicalTypes[k] = key
result = key
of tyTypeDesc, tyTypeClasses, tyGenericParam, tyFromExpr, tyFieldAccessor:
if key.sym != nil:
internalError(key.sym.info, "metatype not eliminated")
else:
internalError("metatype not eliminated")
of tyDistinct:
if key.deepCopy != nil: result = key
else: result = getUniqueType(lastSon(key))
of tyGenericInst, tyOrdinal, tyMutable, tyStatic:
result = getUniqueType(lastSon(key))
#let obj = lastSon(key)
#if obj.sym != nil and obj.sym.name.s == "TOption":
# echo "for ", typeToString(key), " I returned "
# debug result
of tyPtr, tyRef, tyVar:
let elemType = lastSon(key)
if elemType.kind in {tyBool, tyChar, tyInt..tyUInt64}:
# no canonicalization for integral types, so that e.g. ``ptr pid_t`` is
# produced instead of ``ptr NI``.
result = key
else:
result = slowSearch(key, k)
of tyArrayConstr, tyGenericInvocation, tyGenericBody,
tyOpenArray, tyArray, tySet, tyRange, tyTuple,
tySequence, tyForward, tyVarargs, tyProxy:
# we have to do a slow linear search because types may need
# to be compared by their structure:
result = slowSearch(key, k)
of tyObject:
if tfFromGeneric notin key.flags:
# fast case; lookup per id suffices:
result = PType(idTableGet(gTypeTable[k], key))
if result == nil:
idTablePut(gTypeTable[k], key, key)
result = key
else:
# ugly slow case: need to compare by structure
if idTableHasObjectAsKey(gTypeTable[k], key): return key
for h in countup(0, high(gTypeTable[k].data)):
var t = PType(gTypeTable[k].data[h].key)
if t != nil and sameBackendType(t, key):
return t
idTablePut(gTypeTable[k], key, key)
result = key
of tyEnum:
result = PType(idTableGet(gTypeTable[k], key))
if result == nil:
idTablePut(gTypeTable[k], key, key)
result = key
of tyProc:
if key.callConv != ccClosure:
result = key
else:
# ugh, we need the canon here:
result = slowSearch(key, k)
of tyUnused, tyUnused0, tyUnused1: internalError("getUniqueType")
proc tableGetType*(tab: TIdTable, key: PType): RootRef =
# returns nil if we need to declare this type
result = idTableGet(tab, key)
if (result == nil) and (tab.counter > 0):
# we have to do a slow linear search because types may need
# to be compared by their structure:
for h in countup(0, high(tab.data)):
var t = PType(tab.data[h].key)
if t != nil:
if sameType(t, key):
return tab.data[h].val
proc makeSingleLineCString*(s: string): string =
result = "\""
for c in items(s):
result.add(c.toCChar)
result.add('\"')
proc mangle*(name: string): string =
## Lowercases the given name and manges any non-alphanumeric characters
## so they are represented as `HEX____`. If the name starts with a number,
## `N` is prepended
result = newStringOfCap(name.len)
case name[0]
of Letters:
result.add(name[0])
of Digits:
result.add("N" & name[0])
else:
result = "HEX" & toHex(ord(name[0]), 2)
for i in 1..(name.len-1):
let c = name[i]
case c
of 'A'..'Z':
add(result, c.toLowerAscii)
of '_':
discard
of 'a'..'z', '0'..'9':
add(result, c)
else:
add(result, "HEX" & toHex(ord(c), 2))
proc makeLLVMString*(s: string): Rope =
const MaxLineLength = 64
result = nil
var res = "c\""
for i in countup(0, len(s) - 1):
if (i + 1) mod MaxLineLength == 0:
add(result, rope(res))
setLen(res, 0)
case s[i]
of '\0'..'\x1F', '\x80'..'\xFF', '\"', '\\':
add(res, '\\')
add(res, toHex(ord(s[i]), 2))
else: add(res, s[i])
add(res, "\\00\"")
add(result, rope(res))
initTypeTables()
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