mirror of
https://github.com/c64scene-ar/llvm-6502.git
synced 2024-11-10 17:07:06 +00:00
58604cd944
Unify default construction of error_code uses on this idiom so that users don't feel compelled to make static globals for naming convenience. (unfortunately I couldn't make the original ctor private as some APIs don't return their result, instead using an out parameter (that makes sense to default construct) - which is a bit of a pity. I did, however, find/fix some cases of unnecessary default construction of error_code before I hit the unfixable cases) git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@150197 91177308-0d34-0410-b5e6-96231b3b80d8
99 lines
2.9 KiB
C++
99 lines
2.9 KiB
C++
//===--- llvm/Support/DataStream.cpp - Lazy streamed data -----------------===//
|
|
//
|
|
// The LLVM Compiler Infrastructure
|
|
//
|
|
// This file is distributed under the University of Illinois Open Source
|
|
// License. See LICENSE.TXT for details.
|
|
//
|
|
//===----------------------------------------------------------------------===//
|
|
//
|
|
// This file implements DataStreamer, which fetches bytes of Data from
|
|
// a stream source. It provides support for streaming (lazy reading) of
|
|
// bitcode. An example implementation of streaming from a file or stdin
|
|
// is included.
|
|
//
|
|
//===----------------------------------------------------------------------===//
|
|
|
|
#define DEBUG_TYPE "Data-stream"
|
|
#include "llvm/ADT/Statistic.h"
|
|
#include "llvm/Support/DataStream.h"
|
|
#include "llvm/Support/Program.h"
|
|
#include "llvm/Support/system_error.h"
|
|
#include <string>
|
|
#include <cerrno>
|
|
#include <cstdio>
|
|
#if !defined(_MSC_VER) && !defined(__MINGW32__)
|
|
#include <unistd.h>
|
|
#else
|
|
#include <io.h>
|
|
#endif
|
|
#include <fcntl.h>
|
|
using namespace llvm;
|
|
|
|
// Interface goals:
|
|
// * StreamableMemoryObject doesn't care about complexities like using
|
|
// threads/async callbacks to actually overlap download+compile
|
|
// * Don't want to duplicate Data in memory
|
|
// * Don't need to know total Data len in advance
|
|
// Non-goals:
|
|
// StreamableMemoryObject already has random access so this interface only does
|
|
// in-order streaming (no arbitrary seeking, else we'd have to buffer all the
|
|
// Data here in addition to MemoryObject). This also means that if we want
|
|
// to be able to to free Data, BitstreamBytes/BitcodeReader will implement it
|
|
|
|
STATISTIC(NumStreamFetches, "Number of calls to Data stream fetch");
|
|
|
|
namespace llvm {
|
|
DataStreamer::~DataStreamer() {}
|
|
}
|
|
|
|
namespace {
|
|
|
|
// Very simple stream backed by a file. Mostly useful for stdin and debugging;
|
|
// actual file access is probably still best done with mmap.
|
|
class DataFileStreamer : public DataStreamer {
|
|
int Fd;
|
|
public:
|
|
DataFileStreamer() : Fd(0) {}
|
|
virtual ~DataFileStreamer() {
|
|
close(Fd);
|
|
}
|
|
virtual size_t GetBytes(unsigned char *buf, size_t len) {
|
|
NumStreamFetches++;
|
|
return read(Fd, buf, len);
|
|
}
|
|
|
|
error_code OpenFile(const std::string &Filename) {
|
|
if (Filename == "-") {
|
|
Fd = 0;
|
|
sys::Program::ChangeStdinToBinary();
|
|
return error_code::success();
|
|
}
|
|
|
|
int OpenFlags = O_RDONLY;
|
|
#ifdef O_BINARY
|
|
OpenFlags |= O_BINARY; // Open input file in binary mode on win32.
|
|
#endif
|
|
Fd = ::open(Filename.c_str(), OpenFlags);
|
|
if (Fd == -1)
|
|
return error_code(errno, posix_category());
|
|
return error_code::success();
|
|
}
|
|
};
|
|
|
|
}
|
|
|
|
namespace llvm {
|
|
DataStreamer *getDataFileStreamer(const std::string &Filename,
|
|
std::string *StrError) {
|
|
DataFileStreamer *s = new DataFileStreamer();
|
|
if (error_code e = s->OpenFile(Filename)) {
|
|
*StrError = std::string("Could not open ") + Filename + ": " +
|
|
e.message() + "\n";
|
|
return NULL;
|
|
}
|
|
return s;
|
|
}
|
|
|
|
}
|