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mollusk
2018-02-10 10:27:19 -07:00
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# This file is a part of Julia. License is MIT: https://julialang.org/license
# timing
# time() in libc.jl
# high-resolution relative time, in nanoseconds
"""
time_ns()
Get the time in nanoseconds. The time corresponding to 0 is undefined, and wraps every 5.8 years.
"""
time_ns() = ccall(:jl_hrtime, UInt64, ())
# This type must be kept in sync with the C struct in src/gc.h
struct GC_Num
allocd ::Int64 # GC internal
deferred_alloc::Int64 # GC internal
freed ::Int64 # GC internal
malloc ::UInt64
realloc ::UInt64
poolalloc ::UInt64
bigalloc ::UInt64
freecall ::UInt64
total_time ::UInt64
total_allocd::UInt64 # GC internal
since_sweep ::UInt64 # GC internal
collect ::Csize_t # GC internal
pause ::Cint
full_sweep ::Cint
end
gc_num() = ccall(:jl_gc_num, GC_Num, ())
# This type is to represent differences in the counters, so fields may be negative
struct GC_Diff
allocd ::Int64 # Bytes allocated
malloc ::Int64 # Number of GC aware malloc()
realloc ::Int64 # Number of GC aware realloc()
poolalloc ::Int64 # Number of pool allocation
bigalloc ::Int64 # Number of big (non-pool) allocation
freecall ::Int64 # Number of GC aware free()
total_time ::Int64 # Time spent in garbage collection
pause ::Int64 # Number of GC pauses
full_sweep ::Int64 # Number of GC full collection
end
gc_total_bytes(gc_num::GC_Num) =
(gc_num.allocd + gc_num.deferred_alloc +
Int64(gc_num.collect) + Int64(gc_num.total_allocd))
function GC_Diff(new::GC_Num, old::GC_Num)
# logic from `src/gc.c:jl_gc_total_bytes`
old_allocd = gc_total_bytes(old)
new_allocd = gc_total_bytes(new)
return GC_Diff(new_allocd - old_allocd,
Int64(new.malloc - old.malloc),
Int64(new.realloc - old.realloc),
Int64(new.poolalloc - old.poolalloc),
Int64(new.bigalloc - old.bigalloc),
Int64(new.freecall - old.freecall),
Int64(new.total_time - old.total_time),
new.pause - old.pause,
new.full_sweep - old.full_sweep)
end
function gc_alloc_count(diff::GC_Diff)
diff.malloc + diff.realloc + diff.poolalloc + diff.bigalloc
end
# total time spend in garbage collection, in nanoseconds
gc_time_ns() = ccall(:jl_gc_total_hrtime, UInt64, ())
# total number of bytes allocated so far
gc_bytes() = ccall(:jl_gc_total_bytes, Int64, ())
"""
tic()
Set a timer to be read by the next call to [`toc`](@ref) or [`toq`](@ref). The
macro call `@time expr` can also be used to time evaluation.
```julia-repl
julia> tic()
0x0000c45bc7abac95
julia> sleep(0.3)
julia> toc()
elapsed time: 0.302745944 seconds
0.302745944
```
"""
function tic()
t0 = time_ns()
task_local_storage(:TIMERS, (t0, get(task_local_storage(), :TIMERS, ())))
return t0
end
"""
toq()
Return, but do not print, the time elapsed since the last [`tic`](@ref). The
macro calls `@timed expr` and `@elapsed expr` also return evaluation time.
```julia-repl
julia> tic()
0x0000c46477a9675d
julia> sleep(0.3)
julia> toq()
0.302251004
```
"""
function toq()
t1 = time_ns()
timers = get(task_local_storage(), :TIMERS, ())
if timers === ()
error("toc() without tic()")
end
t0 = timers[1]::UInt64
task_local_storage(:TIMERS, timers[2])
(t1-t0)/1e9
end
"""
toc()
Print and return the time elapsed since the last [`tic`](@ref). The macro call
`@time expr` can also be used to time evaluation.
```julia-repl
julia> tic()
0x0000c45bc7abac95
julia> sleep(0.3)
julia> toc()
elapsed time: 0.302745944 seconds
0.302745944
```
"""
function toc()
t = toq()
println("elapsed time: ", t, " seconds")
return t
end
# print elapsed time, return expression value
const _mem_units = ["byte", "KiB", "MiB", "GiB", "TiB", "PiB"]
const _cnt_units = ["", " k", " M", " G", " T", " P"]
function prettyprint_getunits(value, numunits, factor)
if value == 0 || value == 1
return (value, 1)
end
unit = ceil(Int, log(value) / log(factor))
unit = min(numunits, unit)
number = value/factor^(unit-1)
return number, unit
end
function padded_nonzero_print(value,str)
if value != 0
blanks = " "[1:18-length(str)]
println("$str:$blanks$value")
end
end
function time_print(elapsedtime, bytes, gctime, allocs)
@printf("%10.6f seconds", elapsedtime/1e9)
if bytes != 0 || allocs != 0
bytes, mb = prettyprint_getunits(bytes, length(_mem_units), Int64(1024))
allocs, ma = prettyprint_getunits(allocs, length(_cnt_units), Int64(1000))
if ma == 1
@printf(" (%d%s allocation%s: ", allocs, _cnt_units[ma], allocs==1 ? "" : "s")
else
@printf(" (%.2f%s allocations: ", allocs, _cnt_units[ma])
end
if mb == 1
@printf("%d %s%s", bytes, _mem_units[mb], bytes==1 ? "" : "s")
else
@printf("%.3f %s", bytes, _mem_units[mb])
end
if gctime > 0
@printf(", %.2f%% gc time", 100*gctime/elapsedtime)
end
print(")")
elseif gctime > 0
@printf(", %.2f%% gc time", 100*gctime/elapsedtime)
end
println()
end
function timev_print(elapsedtime, diff::GC_Diff)
allocs = gc_alloc_count(diff)
time_print(elapsedtime, diff.allocd, diff.total_time, allocs)
print("elapsed time (ns): $elapsedtime\n")
padded_nonzero_print(diff.total_time, "gc time (ns)")
padded_nonzero_print(diff.allocd, "bytes allocated")
padded_nonzero_print(diff.poolalloc, "pool allocs")
padded_nonzero_print(diff.bigalloc, "non-pool GC allocs")
padded_nonzero_print(diff.malloc, "malloc() calls")
padded_nonzero_print(diff.realloc, "realloc() calls")
padded_nonzero_print(diff.freecall, "free() calls")
padded_nonzero_print(diff.pause, "GC pauses")
padded_nonzero_print(diff.full_sweep, "full collections")
end
"""
@time
A macro to execute an expression, printing the time it took to execute, the number of
allocations, and the total number of bytes its execution caused to be allocated, before
returning the value of the expression.
See also [`@timev`](@ref), [`@timed`](@ref), [`@elapsed`](@ref), and
[`@allocated`](@ref).
```julia-repl
julia> @time rand(10^6);
0.001525 seconds (7 allocations: 7.630 MiB)
julia> @time begin
sleep(0.3)
1+1
end
0.301395 seconds (8 allocations: 336 bytes)
```
"""
macro time(ex)
quote
local stats = gc_num()
local elapsedtime = time_ns()
local val = $(esc(ex))
elapsedtime = time_ns() - elapsedtime
local diff = GC_Diff(gc_num(), stats)
time_print(elapsedtime, diff.allocd, diff.total_time,
gc_alloc_count(diff))
val
end
end
"""
@timev
This is a verbose version of the `@time` macro. It first prints the same information as
`@time`, then any non-zero memory allocation counters, and then returns the value of the
expression.
See also [`@time`](@ref), [`@timed`](@ref), [`@elapsed`](@ref), and
[`@allocated`](@ref).
```julia-repl
julia> @timev rand(10^6);
0.001006 seconds (7 allocations: 7.630 MiB)
elapsed time (ns): 1005567
bytes allocated: 8000256
pool allocs: 6
malloc() calls: 1
```
"""
macro timev(ex)
quote
local stats = gc_num()
local elapsedtime = time_ns()
local val = $(esc(ex))
elapsedtime = time_ns() - elapsedtime
timev_print(elapsedtime, GC_Diff(gc_num(), stats))
val
end
end
"""
@elapsed
A macro to evaluate an expression, discarding the resulting value, instead returning the
number of seconds it took to execute as a floating-point number.
See also [`@time`](@ref), [`@timev`](@ref), [`@timed`](@ref),
and [`@allocated`](@ref).
```julia-repl
julia> @elapsed sleep(0.3)
0.301391426
```
"""
macro elapsed(ex)
quote
local t0 = time_ns()
local val = $(esc(ex))
(time_ns()-t0)/1e9
end
end
# measure bytes allocated without *most* contamination from compilation
# Note: This reports a different value from the @time macros, because
# it wraps the call in a function, however, this means that things
# like: @allocated y = foo()
# will not work correctly, because it will set y in the context of
# the local function made by the macro, not the current function
"""
@allocated
A macro to evaluate an expression, discarding the resulting value, instead returning the
total number of bytes allocated during evaluation of the expression. Note: the expression is
evaluated inside a local function, instead of the current context, in order to eliminate the
effects of compilation, however, there still may be some allocations due to JIT compilation.
This also makes the results inconsistent with the `@time` macros, which do not try to adjust
for the effects of compilation.
See also [`@time`](@ref), [`@timev`](@ref), [`@timed`](@ref),
and [`@elapsed`](@ref).
```julia-repl
julia> @allocated rand(10^6)
8000080
```
"""
macro allocated(ex)
quote
let
local f
function f()
b0 = gc_bytes()
$(esc(ex))
gc_bytes() - b0
end
f()
end
end
end
"""
@timed
A macro to execute an expression, and return the value of the expression, elapsed time,
total bytes allocated, garbage collection time, and an object with various memory allocation
counters.
See also [`@time`](@ref), [`@timev`](@ref), [`@elapsed`](@ref), and
[`@allocated`](@ref).
```julia-repl
julia> val, t, bytes, gctime, memallocs = @timed rand(10^6);
julia> t
0.006634834
julia> bytes
8000256
julia> gctime
0.0055765
julia> fieldnames(typeof(memallocs))
9-element Array{Symbol,1}:
:allocd
:malloc
:realloc
:poolalloc
:bigalloc
:freecall
:total_time
:pause
:full_sweep
julia> memallocs.total_time
5576500
```
"""
macro timed(ex)
quote
local stats = gc_num()
local elapsedtime = time_ns()
local val = $(esc(ex))
elapsedtime = time_ns() - elapsedtime
local diff = GC_Diff(gc_num(), stats)
val, elapsedtime/1e9, diff.allocd, diff.total_time/1e9, diff
end
end
function fftw_vendor()
if Base.libfftw_name in ("libmkl_rt", "mkl_rt")
return :mkl
else
return :fftw
end
end
## printing with color ##
function with_output_color(f::Function, color::Union{Int, Symbol}, io::IO, args...; bold::Bool = false)
buf = IOBuffer()
have_color && bold && print(buf, text_colors[:bold])
have_color && print(buf, get(text_colors, color, color_normal))
try f(IOContext(buf, io), args...)
finally
have_color && color != :nothing && print(buf, get(disable_text_style, color, text_colors[:default]))
have_color && (bold || color == :bold) && print(buf, disable_text_style[:bold])
print(io, String(take!(buf)))
end
end
"""
print_with_color(color::Union{Symbol, Int}, [io], xs...; bold::Bool = false)
Print `xs` in a color specified as a symbol.
`color` may take any of the values $(Base.available_text_colors_docstring)
or an integer between 0 and 255 inclusive. Note that not all terminals support 256 colors.
If the keyword `bold` is given as `true`, the result will be printed in bold.
"""
print_with_color(color::Union{Int, Symbol}, io::IO, msg...; bold::Bool = false) =
with_output_color(print, color, io, msg...; bold = bold)
print_with_color(color::Union{Int, Symbol}, msg...; bold::Bool = false) =
print_with_color(color, STDOUT, msg...; bold = bold)
println_with_color(color::Union{Int, Symbol}, io::IO, msg...; bold::Bool = false) =
with_output_color(println, color, io, msg...; bold = bold)
println_with_color(color::Union{Int, Symbol}, msg...; bold::Bool = false) =
println_with_color(color, STDOUT, msg...; bold = bold)
## warnings and messages ##
const log_info_to = Dict{Tuple{Union{Module,Void},Union{Symbol,Void}},IO}()
const log_warn_to = Dict{Tuple{Union{Module,Void},Union{Symbol,Void}},IO}()
const log_error_to = Dict{Tuple{Union{Module,Void},Union{Symbol,Void}},IO}()
function _redirect(io::IO, log_to::Dict, sf::StackTraces.StackFrame)
isnull(sf.linfo) && return io
mod = get(sf.linfo).def.module
fun = sf.func
if haskey(log_to, (mod,fun))
return log_to[(mod,fun)]
elseif haskey(log_to, (mod,nothing))
return log_to[(mod,nothing)]
elseif haskey(log_to, (nothing,nothing))
return log_to[(nothing,nothing)]
else
return io
end
end
function _redirect(io::IO, log_to::Dict, fun::Symbol)
clos = string("#",fun,"#")
kw = string("kw##",fun)
local sf
break_next_frame = false
for trace in backtrace()
stack::Vector{StackFrame} = StackTraces.lookup(trace)
filter!(frame -> !frame.from_c, stack)
for frame in stack
isnull(frame.linfo) && continue
sf = frame
break_next_frame && (@goto skip)
get(frame.linfo).def.module == Base || continue
sff = string(frame.func)
if frame.func == fun || startswith(sff, clos) || startswith(sff, kw)
break_next_frame = true
end
end
end
@label skip
_redirect(io, log_to, sf)
end
@inline function redirect(io::IO, log_to::Dict, arg::Union{Symbol,StackTraces.StackFrame})
if isempty(log_to)
return io
else
if length(log_to)==1 && haskey(log_to,(nothing,nothing))
return log_to[(nothing,nothing)]
else
return _redirect(io, log_to, arg)
end
end
end
"""
logging(io [, m [, f]][; kind=:all])
logging([; kind=:all])
Stream output of informational, warning, and/or error messages to `io`,
overriding what was otherwise specified. Optionally, divert stream only for
module `m`, or specifically function `f` within `m`. `kind` can be `:all` (the
default), `:info`, `:warn`, or `:error`. See `Base.log_{info,warn,error}_to`
for the current set of redirections. Call `logging` with no arguments (or just
the `kind`) to reset everything.
"""
function logging(io::IO, m::Union{Module,Void}=nothing, f::Union{Symbol,Void}=nothing;
kind::Symbol=:all)
(kind==:all || kind==:info) && (log_info_to[(m,f)] = io)
(kind==:all || kind==:warn) && (log_warn_to[(m,f)] = io)
(kind==:all || kind==:error) && (log_error_to[(m,f)] = io)
nothing
end
function logging(; kind::Symbol=:all)
(kind==:all || kind==:info) && empty!(log_info_to)
(kind==:all || kind==:warn) && empty!(log_warn_to)
(kind==:all || kind==:error) && empty!(log_error_to)
nothing
end
"""
info([io, ] msg..., [prefix="INFO: "])
Display an informational message.
Argument `msg` is a string describing the information to be displayed.
The `prefix` keyword argument can be used to override the default
prepending of `msg`.
```jldoctest
julia> info("hello world")
INFO: hello world
julia> info("hello world"; prefix="MY INFO: ")
MY INFO: hello world
```
See also [`logging`](@ref).
"""
function info(io::IO, msg...; prefix="INFO: ")
buf = IOBuffer()
iob = redirect(IOContext(buf, io), log_info_to, :info)
print_with_color(info_color(), iob, prefix; bold = true)
println_with_color(info_color(), iob, chomp(string(msg...)))
print(io, String(take!(buf)))
return
end
info(msg...; prefix="INFO: ") = info(STDERR, msg..., prefix=prefix)
# print a warning only once
const have_warned = Set()
warn_once(io::IO, msg...) = warn(io, msg..., once=true)
warn_once(msg...) = warn(STDERR, msg..., once=true)
"""
warn([io, ] msg..., [prefix="WARNING: ", once=false, key=nothing, bt=nothing, filename=nothing, lineno::Int=0])
Display a warning. Argument `msg` is a string describing the warning to be
displayed. Set `once` to true and specify a `key` to only display `msg` the
first time `warn` is called. If `bt` is not `nothing` a backtrace is displayed.
If `filename` is not `nothing` both it and `lineno` are displayed.
See also [`logging`](@ref).
"""
function warn(io::IO, msg...;
prefix="WARNING: ", once=false, key=nothing, bt=nothing,
filename=nothing, lineno::Int=0)
str = chomp(string(msg...))
if once
if key === nothing
key = str
end
(key in have_warned) && return
push!(have_warned, key)
end
buf = IOBuffer()
iob = redirect(IOContext(buf, io), log_warn_to, :warn)
print_with_color(warn_color(), iob, prefix; bold = true)
print_with_color(warn_color(), iob, str)
if bt !== nothing
show_backtrace(iob, bt)
end
if filename !== nothing
print(iob, "\nwhile loading $filename, in expression starting on line $lineno")
end
println(iob)
print(io, String(take!(buf)))
return
end
"""
warn(msg)
Display a warning. Argument `msg` is a string describing the warning to be displayed.
```jldoctest
julia> warn("Beep Beep")
WARNING: Beep Beep
```
"""
warn(msg...; kw...) = warn(STDERR, msg...; kw...)
warn(io::IO, err::Exception; prefix="ERROR: ", kw...) =
warn(io, sprint(showerror, err), prefix=prefix; kw...)
warn(err::Exception; prefix="ERROR: ", kw...) =
warn(STDERR, err, prefix=prefix; kw...)
info(io::IO, err::Exception; prefix="ERROR: ", kw...) =
info(io, sprint(showerror, err), prefix=prefix; kw...)
info(err::Exception; prefix="ERROR: ", kw...) =
info(STDERR, err, prefix=prefix; kw...)
function julia_cmd(julia=joinpath(JULIA_HOME, julia_exename()))
opts = JLOptions()
cpu_target = unsafe_string(opts.cpu_target)
image_file = unsafe_string(opts.image_file)
compile = if opts.compile_enabled == 0
"no"
elseif opts.compile_enabled == 2
"all"
elseif opts.compile_enabled == 3
"min"
else
"yes"
end
depwarn = if opts.depwarn == 0
"no"
elseif opts.depwarn == 2
"error"
else
"yes"
end
`$julia -C$cpu_target -J$image_file --compile=$compile --depwarn=$depwarn`
end
function julia_exename()
if ccall(:jl_is_debugbuild, Cint, ()) == 0
return @static is_windows() ? "julia.exe" : "julia"
else
return @static is_windows() ? "julia-debug.exe" : "julia-debug"
end
end
"""
securezero!(o)
`securezero!` fills the memory associated with an object `o` with zeros.
Unlike `fill!(o,0)` and similar code, which might be optimized away by
the compiler for objects about to be discarded, the `securezero!` function
will always be called.
"""
function securezero! end
@noinline securezero!(a::AbstractArray{<:Number}) = fill!(a, 0)
securezero!(s::String) = unsafe_securezero!(pointer(s), sizeof(s))
@noinline unsafe_securezero!{T}(p::Ptr{T}, len::Integer=1) =
ccall(:memset, Ptr{T}, (Ptr{T}, Cint, Csize_t), p, 0, len*sizeof(T))
unsafe_securezero!(p::Ptr{Void}, len::Integer=1) = Ptr{Void}(unsafe_securezero!(Ptr{UInt8}(p), len))
if is_windows()
function getpass(prompt::AbstractString)
print(prompt)
flush(STDOUT)
p = Vector{UInt8}(128) # mimic Unix getpass in ignoring more than 128-char passwords
# (also avoids any potential memory copies arising from push!)
try
plen = 0
while true
c = ccall(:_getch, UInt8, ())
if c == 0xff || c == UInt8('\n') || c == UInt8('\r')
break # EOF or return
elseif c == 0x00 || c == 0xe0
ccall(:_getch, UInt8, ()) # ignore function/arrow keys
elseif c == UInt8('\b') && plen > 0
plen -= 1 # delete last character on backspace
elseif !iscntrl(Char(c)) && plen < 128
p[plen += 1] = c
end
end
return unsafe_string(pointer(p), plen) # use unsafe_string rather than String(p[1:plen])
# to be absolutely certain we never make an extra copy
finally
securezero!(p)
end
return ""
end
else
getpass(prompt::AbstractString) = unsafe_string(ccall(:getpass, Cstring, (Cstring,), prompt))
end
# Windows authentication prompt
if is_windows()
struct CREDUI_INFO
cbSize::UInt32
parent::Ptr{Void}
pszMessageText::Ptr{UInt16}
pszCaptionText::Ptr{UInt16}
banner::Ptr{Void}
end
const CREDUIWIN_GENERIC = 0x0001
const CREDUIWIN_IN_CRED_ONLY = 0x0020
const CREDUIWIN_ENUMERATE_CURRENT_USER = 0x0200
const CRED_PACK_GENERIC_CREDENTIALS = 0x0004
const ERROR_SUCCESS = 0x0000
const ERROR_CANCELLED = 0x04c7
function winprompt(message, caption, default_username; prompt_username = true)
# Step 1: Create an encrypted username/password bundle that will be used to set
# the default username (in theory could also provide a default password)
credbuf = Array{UInt8,1}(1024)
credbufsize = Ref{UInt32}(sizeof(credbuf))
succeeded = ccall((:CredPackAuthenticationBufferW, "credui.dll"), stdcall, Bool,
(UInt32, Cwstring, Cwstring, Ptr{UInt8}, Ptr{UInt32}),
CRED_PACK_GENERIC_CREDENTIALS, default_username, "", credbuf, credbufsize)
@assert succeeded
# Step 2: Create the actual dialog
# 2.1: Set up the window
messageArr = Base.cwstring(message)
captionArr = Base.cwstring(caption)
pfSave = Ref{Bool}(false)
cred = Ref{CREDUI_INFO}(CREDUI_INFO(sizeof(CREDUI_INFO), C_NULL, pointer(messageArr), pointer(captionArr), C_NULL))
dwflags = CREDUIWIN_GENERIC | CREDUIWIN_ENUMERATE_CURRENT_USER
if !prompt_username
# Disable setting anything other than default_username
dwflags |= CREDUIWIN_IN_CRED_ONLY
end
authPackage = Ref{Culong}(0)
outbuf_data = Ref{Ptr{Void}}(C_NULL)
outbuf_size = Ref{Culong}(0)
# 2.2: Do the actual request
code = ccall((:CredUIPromptForWindowsCredentialsW, "credui.dll"), stdcall, UInt32, (Ptr{CREDUI_INFO}, UInt32, Ptr{Culong},
Ptr{Void}, Culong, Ptr{Ptr{Void}}, Ptr{Culong}, Ptr{Bool}, UInt32), cred, 0, authPackage, credbuf, credbufsize[],
outbuf_data, outbuf_size, pfSave, dwflags)
# 2.3: If that failed for any reason other than the user canceling, error out.
# If the user canceled, just return a nullable
if code == ERROR_CANCELLED
return Nullable{Tuple{String,String}}()
elseif code != ERROR_SUCCESS
error(Base.Libc.FormatMessage(code))
end
# Step 3: Convert encrypted credentials back to plain text
passbuf = Array{UInt16,1}(1024)
passlen = Ref{UInt32}(length(passbuf))
usernamebuf = Array{UInt16,1}(1024)
usernamelen = Ref{UInt32}(length(usernamebuf))
# Need valid buffers for domain, even though we don't care
dummybuf = Array{UInt16,1}(1024)
succeeded = ccall((:CredUnPackAuthenticationBufferW, "credui.dll"), Bool,
(UInt32, Ptr{Void}, UInt32, Ptr{UInt16}, Ptr{UInt32}, Ptr{UInt16}, Ptr{UInt32}, Ptr{UInt16}, Ptr{UInt32}),
0, outbuf_data[], outbuf_size[], usernamebuf, usernamelen, dummybuf, Ref{UInt32}(1024), passbuf, passlen)
if !succeeded
error(Base.Libc.FormatMessage())
end
# Step 4: Free the encrypted buffer
# ccall(:SecureZeroMemory, Ptr{Void}, (Ptr{Void}, Csize_t), outbuf_data[], outbuf_size[]) - not an actual function
unsafe_securezero!(outbuf_data[], outbuf_size[])
ccall((:CoTaskMemFree, "ole32.dll"), Void, (Ptr{Void},), outbuf_data[])
# Done.
passbuf_ = passbuf[1:passlen[]-1]
result = Nullable((String(transcode(UInt8, usernamebuf[1:usernamelen[]-1])),
String(transcode(UInt8, passbuf_))))
securezero!(passbuf_)
securezero!(passbuf)
return result
end
end
"""
crc32c(data, crc::UInt32=0x00000000)
Compute the CRC-32c checksum of the given `data`, which can be
an `Array{UInt8}` or a `String`. Optionally, you can pass
a starting `crc` integer to be mixed in with the checksum.
(Technically, a little-endian checksum is computed.)
"""
function crc32c end
crc32c(a::Union{Array{UInt8},String}, crc::UInt32=0x00000000) =
ccall(:jl_crc32c, UInt32, (UInt32, Ptr{UInt8}, Csize_t), crc, a, sizeof(a))
"""
@kwdef typedef
This is a helper macro that automatically defines a keyword-based constructor for the type
declared in the expression `typedef`, which must be a `struct` or `mutable struct`
expression. The default argument is supplied by declaring fields of the form `field::T =
default`. If no default is provided then the default is provided by the `kwdef_val(T)`
function.
```julia
@kwdef struct Foo
a::Cint # implied default Cint(0)
b::Cint = 1 # specified default
z::Cstring # implied default Cstring(C_NULL)
y::Bar # implied default Bar()
end
```
"""
macro kwdef(expr)
expr = macroexpand(expr) # to expand @static
T = expr.args[2]
params_ex = Expr(:parameters)
call_ex = Expr(:call, T)
_kwdef!(expr.args[3], params_ex, call_ex)
quote
Base.@__doc__($(esc(expr)))
$(esc(Expr(:call,T,params_ex))) = $(esc(call_ex))
end
end
# @kwdef helper function
# mutates arguments inplace
function _kwdef!(blk, params_ex, call_ex)
for i in eachindex(blk.args)
ei = blk.args[i]
isa(ei, Expr) || continue
if ei.head == :(=)
# var::Typ = defexpr
dec = ei.args[1] # var::Typ
var = dec.args[1] # var
def = ei.args[2] # defexpr
push!(params_ex.args, Expr(:kw, var, def))
push!(call_ex.args, var)
blk.args[i] = dec
elseif ei.head == :(::)
dec = ei # var::Typ
var = dec.args[1] # var
def = :(Base.kwdef_val($(ei.args[2])))
push!(params_ex.args, Expr(:kw, var, def))
push!(call_ex.args, dec.args[1])
elseif ei.head == :block
# can arise with use of @static inside type decl
_kwdef!(ei, params_ex, call_ex)
end
end
blk
end
"""
kwdef_val(T)
The default value for a type for use with the `@kwdef` macro. Returns:
- null pointer for pointer types (`Ptr{T}`, `Cstring`, `Cwstring`)
- zero for integer types
- no-argument constructor calls (e.g. `T()`) for all other types
"""
function kwdef_val end
kwdef_val(::Type{Ptr{T}}) where {T} = Ptr{T}(C_NULL)
kwdef_val(::Type{Cstring}) = Cstring(C_NULL)
kwdef_val(::Type{Cwstring}) = Cwstring(C_NULL)
kwdef_val(::Type{T}) where {T<:Integer} = zero(T)
kwdef_val(::Type{T}) where {T} = T()