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/*
* memory_mapped_input_buffer.cpp
*
* Created on: Mar 3, 2010
* Author: chris
*/
#include <fcntl.h>
#include <stdio.h>
#include <stdint.h>
#include <sys/errno.h>
#include <sys/mman.h>
#include <sys/stat.h>
#include <antlr3input.h>
#include "memory_mapped_input_buffer.h"
#include "util/Assert.h"
#include "util/exception.h"
namespace CVC4 {
namespace parser {
extern "C" {
static ANTLR3_UINT32
MemoryMapFile(pANTLR3_INPUT_STREAM input, const std::string& filename);
void
UnmapFile(pANTLR3_INPUT_STREAM input);
pANTLR3_INPUT_STREAM MemoryMappedInputBufferNew(const std::string& filename) {
// Pointer to the input stream we are going to create
//
pANTLR3_INPUT_STREAM input;
ANTLR3_UINT32 status;
// Allocate memory for the input stream structure
//
input = (pANTLR3_INPUT_STREAM) ANTLR3_CALLOC(1, sizeof(ANTLR3_INPUT_STREAM));
if(input == NULL) {
return NULL;
}
// Structure was allocated correctly, now we can read the file.
//
status = MemoryMapFile(input, filename);
// Call the common 8 bit ASCII input stream handler
// Initializer type thingy doobry function.
//
antlr3AsciiSetupStream(input, ANTLR3_CHARSTREAM);
// Now we can set up the file name
//
input->istream->streamName
= input->strFactory->newStr(input->strFactory,
(uint8_t*) filename.c_str());
input->fileName = input->istream->streamName;
input->free = UnmapFile;
if(status != ANTLR3_SUCCESS) {
input->close(input);
return NULL;
}
return input;
}
static ANTLR3_UINT32 MemoryMapFile(pANTLR3_INPUT_STREAM input,
const std::string& filename) {
errno = 0;
struct stat st;
if(stat(filename.c_str(), &st) == -1) {
return ANTLR3_ERR_NOFILE;
}
input->sizeBuf = st.st_size;
int fd = open(filename.c_str(), O_RDONLY);
if(fd == -1) {
return ANTLR3_ERR_NOFILE;
}
input->data = mmap(0, input->sizeBuf, PROT_READ, MAP_FILE | MAP_PRIVATE, fd,
0);
errno = 0;
if(intptr_t(input->data) == -1) {
return ANTLR3_ERR_NOMEM;
}
return ANTLR3_SUCCESS;
}
/* This is a bit shady. antlr3AsciiSetupStream has free and close as aliases.
* We need to unmap the file somewhere, so we install this function as free and
* call the default version of close to de-allocate everything else. */
void UnmapFile(pANTLR3_INPUT_STREAM input) {
munmap((void*) input->data, input->sizeBuf);
input->close(input);
}
}
}
}
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