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//===- ReaderWrappers.cpp - Parse bytecode from file or buffer -----------===//
//
// This file implements loading and parsing a bytecode file and parsing a
// bytecode module from a given buffer.
//
//===----------------------------------------------------------------------===//
#include "ReaderInternals.h"
#include "Support/StringExtras.h"
#include "Config/fcntl.h"
#include <sys/stat.h>
#include "Config/unistd.h"
#include "Config/sys/mman.h"
namespace {
/// FDHandle - Simple handle class to make sure a file descriptor gets closed
/// when the object is destroyed.
///
class FDHandle {
int FD;
public:
FDHandle(int fd) : FD(fd) {}
operator int() const { return FD; }
~FDHandle() {
if (FD != -1) close(FD);
}
};
/// BytecodeFileReader - parses a bytecode file from a file
///
class BytecodeFileReader : public BytecodeParser {
private:
unsigned char *Buffer;
int Length;
BytecodeFileReader(const BytecodeFileReader&); // Do not implement
void operator=(const BytecodeFileReader &BFR); // Do not implement
public:
BytecodeFileReader(const std::string &Filename);
~BytecodeFileReader();
};
}
BytecodeFileReader::BytecodeFileReader(const std::string &Filename) {
FDHandle FD = open(Filename.c_str(), O_RDONLY);
if (FD == -1)
throw std::string("Error opening file!");
// Stat the file to get its length...
struct stat StatBuf;
if (fstat(FD, &StatBuf) == -1 || StatBuf.st_size == 0)
throw std::string("Error stat'ing file!");
// mmap in the file all at once...
Length = StatBuf.st_size;
Buffer = (unsigned char*)mmap(0, Length, PROT_READ, MAP_PRIVATE, FD, 0);
if (Buffer == (unsigned char*)MAP_FAILED)
throw std::string("Error mmapping file!");
// Parse the bytecode we mmapped in
ParseBytecode(Buffer, Length, Filename);
}
BytecodeFileReader::~BytecodeFileReader() {
// Unmmap the bytecode...
munmap((char*)Buffer, Length);
}
////////////////////////////////////////////////////////////////////////////
namespace {
/// BytecodeBufferReader - parses a bytecode file from a buffer
///
class BytecodeBufferReader : public BytecodeParser {
private:
const unsigned char *Buffer;
bool MustDelete;
BytecodeBufferReader(const BytecodeBufferReader&); // Do not implement
void operator=(const BytecodeBufferReader &BFR); // Do not implement
public:
BytecodeBufferReader(const unsigned char *Buf, unsigned Length,
const std::string &ModuleID);
~BytecodeBufferReader();
};
}
BytecodeBufferReader::BytecodeBufferReader(const unsigned char *Buf,
unsigned Length,
const std::string &ModuleID)
{
// If not aligned, allocate a new buffer to hold the bytecode...
const unsigned char *ParseBegin = 0;
if ((intptr_t)Buf & 3) {
Buffer = new unsigned char[Length+4];
unsigned Offset = 4 - ((intptr_t)Buffer & 3); // Make sure it's aligned
ParseBegin = Buffer + Offset;
memcpy((unsigned char*)ParseBegin, Buf, Length); // Copy it over
MustDelete = true;
} else {
// If we don't need to copy it over, just use the caller's copy
ParseBegin = Buffer = Buf;
MustDelete = false;
}
ParseBytecode(ParseBegin, Length, ModuleID);
}
BytecodeBufferReader::~BytecodeBufferReader() {
if (MustDelete) delete [] Buffer;
}
namespace {
/// BytecodeStdinReader - parses a bytecode file from stdin
///
class BytecodeStdinReader : public BytecodeParser {
private:
std::vector<unsigned char> FileData;
unsigned char *FileBuf;
BytecodeStdinReader(const BytecodeStdinReader&); // Do not implement
void operator=(const BytecodeStdinReader &BFR); // Do not implement
public:
BytecodeStdinReader();
};
}
BytecodeStdinReader::BytecodeStdinReader() {
int BlockSize;
unsigned char Buffer[4096*4];
// Read in all of the data from stdin, we cannot mmap stdin...
while ((BlockSize = read(0 /*stdin*/, Buffer, 4096*4))) {
if (BlockSize == -1)
throw std::string("Error reading from stdin!");
FileData.insert(FileData.end(), Buffer, Buffer+BlockSize);
}
if (FileData.empty())
throw std::string("Standard Input empty!");
FileBuf = &FileData[0];
ParseBytecode(FileBuf, FileData.size(), "<stdin>");
}
/////////////////////////////////////////////////////////////////////////////
//
// Wrapper functions
//
/////////////////////////////////////////////////////////////////////////////
/// getBytecodeBufferModuleProvider - lazy function-at-a-time loading from a
/// buffer
ModuleProvider*
getBytecodeBufferModuleProvider(const unsigned char *Buffer, unsigned Length,
const std::string &ModuleID) {
return new BytecodeBufferReader(Buffer, Length, ModuleID);
}
/// ParseBytecodeBuffer - Parse a given bytecode buffer
///
Module *ParseBytecodeBuffer(const unsigned char *Buffer, unsigned Length,
const std::string &ModuleID, std::string *ErrorStr){
try {
std::auto_ptr<ModuleProvider>
AMP(getBytecodeBufferModuleProvider(Buffer, Length, ModuleID));
return AMP->releaseModule();
} catch (std::string &err) {
if (ErrorStr) *ErrorStr = err;
return 0;
}
}
/// getBytecodeModuleProvider - lazy function-at-a-time loading from a file
///
ModuleProvider *getBytecodeModuleProvider(const std::string &Filename) {
if (Filename != std::string("-")) // Read from a file...
return new BytecodeFileReader(Filename);
else // Read from stdin
return new BytecodeStdinReader();
}
/// ParseBytecodeFile - Parse the given bytecode file
///
Module *ParseBytecodeFile(const std::string &Filename, std::string *ErrorStr) {
try {
std::auto_ptr<ModuleProvider> AMP(getBytecodeModuleProvider(Filename));
return AMP->releaseModule();
} catch (std::string &err) {
if (ErrorStr) *ErrorStr = err;
return 0;
}
}
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