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plugins <- new.env()
plugins[["default"]] <- function( ){
includes = '#include <R.h>
#include <Rdefines.h>
#include <R_ext/Error.h>
'
list(
includes = includes,
body = function( x ) paste( x, '\nRf_warning("your C++ program does not return anything"); \n return R_NilValue ; ' )
)
}
registerPlugin <- function( name, plugin ){
plugins[[ name ]] <- plugin
}
getPlugin <- function( name, ... ){
if( name %in% ls( plugins ) ){
plugins[[ name ]]( ... )
} else if( sprintf("package-%s", name) %in% search() || require( name, character.only = TRUE, quietly = TRUE) ){
plugin <- get( "inlineCxxPlugin" , asNamespace(name) )
if( is.null(plugin) ){
stop( sprintf( "package '%s' does not define an inline plugin", name ) )
}
registerPlugin( name, plugin )
plugin( ... )
} else {
stop( sprintf( "could not find plugin '%s'", name ) )
}
}
paste0 <- function(...) paste(..., sep="")
addLineNumbers <- function( code ){
code <- strsplit( paste( code, collapse = "\n" ), "\n" )[[1]]
sprintf( "%4d : %s", 1:length(code), code)
}
cxxfunction <- function (
sig = character(), body = character(),
plugin = "default",
includes = "",
settings = getPlugin(plugin),
...,
verbose = FALSE
){
f <- basename( tempfile( ) )
if( ! is.list( sig ) ){
sig <- list( sig )
names( sig ) <- f
if( ! length( body ) ) body <- ""
names( body ) <- f
}
if( length(sig) != length(body) )
stop("mismatch between the number of functions declared in 'sig' and the number of function bodies provided in 'body'")
signature <- lapply( sig, function(x) {
if( ! length(x) ){
""
} else {
paste( sprintf( "SEXP %s", names(x) ), collapse = ", " )
}
} )
decl <- lapply( 1:length(sig) , function(index) {
sprintf( 'SEXP %s( %s) ;', names(signature)[index] , signature[[index]] )
} )
def <- lapply( 1:length(sig), function(index){
sprintf( '
SEXP %s( %s ){
%s
}
', names(signature)[index],
signature[[index]],
if(is.null(settings$body)) body[[index]] else settings$body(body[[index]]) )
} )
settings_includes <- if( is.null( settings$includes ) ) "" else paste( settings$includes, collapse = "\n" )
code <- sprintf( '// includes from the plugin
%s
// user includes
%s
// declaration
extern "C" {
%s
}
// definition
%s
', settings_includes , paste( includes, collapse = "\n" ),
paste( decl, collapse = "\n" ),
paste( def, collapse = "\n")
)
if( !is.null( env <- settings$env ) ){
do.call( Sys.setenv, env )
if( isTRUE(verbose) ){
cat( " >> setting environment variables: \n" )
writeLines( sprintf( "%s = %s", names(env), env ) )
}
}
LinkingTo <- settings$LinkingTo
if( !is.null( LinkingTo ) ){
paths <- .find.package(LinkingTo, quiet=TRUE)
if( length( paths ) ){
flag <- paste(
paste0( '-I"', paths, '/include"' ),
collapse = " " )
Sys.setenv( CLINK_CPPFLAGS = flag )
if( isTRUE( verbose ) ){
cat( sprintf( "\n >> LinkingTo : %s\n", paste( LinkingTo, collapse = ", " ) ) )
cat( "CLINK_CPPFLAGS = ", flag, "\n\n" )
}
}
}
if( isTRUE( verbose ) ){
writeLines( " >> Program source :\n" )
writeLines( addLineNumbers( code ) )
}
language <- "C++"
## WRITE AND COMPILE THE CODE
libLFile <- compileCode( f, code, language = language, verbose = verbose )
## SET A FINALIZER TO PERFORM CLEANUP
cleanup <- function(env) {
if ( f %in% names(getLoadedDLLs()) ) dyn.unload(libLFile)
unlink(libLFile)
}
reg.finalizer(environment(), cleanup, onexit=TRUE)
## Create new objects of class CFunc, each containing the code of ALL inline
## functions. This will be used to recompile the whole shared lib when needed
res <- vector("list", length(sig))
names(res) <- names(sig)
res <- new( "CFuncList", res )
for( i in seq_along(sig) ){
res[[i]] <- new( "CFunc", code = code )
## this is the skeleton of the function, the external call is added below using 'body'
## important here: all variables are kept in the local environment
fn <- function(arg) {
if ( !file.exists(libLFile) )
libLFile <<- compileCode(f, code, "C++", verbose)
if ( !( f %in% names(getLoadedDLLs()) ) ) dyn.load(libLFile)
}
## Modify the function formals to give the right argument list
args <- formals(fn)[ rep(1, length(sig[[i]])) ]
names(args) <- names(sig[[i]])
formals(fn) <- args
## create .C/.Call function call that will be added to 'fn'
body <- quote( .Call( "EXTERNALNAME", PACKAGE=f, ARG) )[ c(1:3, rep(4, length(sig[[i]]))) ]
for ( j in seq(along = sig[[i]]) ) body[[j+3]] <- as.name(names(sig[[i]])[j])
body[[2]] <- names(sig)[[i]]
## update the body of 'fn'
body(fn)[[4]] <- body
## set fn as THE function in CFunc of res[[i]]
res[[i]]@.Data <- fn
}
## clear the environment
rm( j )
if( identical( length(sig), 1L ) ) res[[1L]] else res
}
|
