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#include "ReaderInternals.h"
#include "Support/StringExtras.h"
#include "Config/fcntl.h"
#include "Config/unistd.h"
#include "Config/sys/mman.h"
#define CHECK_ALIGN32(begin,end) \
if (align32(begin,end)) \
throw std::string("Alignment error: ReaderWrappers.cpp:" + \
utostr((unsigned)__LINE__));
namespace {
/// 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=(BytecodeFileReader &BFR); // Do not implement
public:
BytecodeFileReader(const std::string &Filename);
~BytecodeFileReader();
};
/// 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=(BytecodeStdinReader &BFR); // Do not implement
public:
BytecodeStdinReader();
~BytecodeStdinReader();
};
/// 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::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;
unsigned char *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);
}
#define ALIGN_PTRS 0
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!");
#if ALIGN_PTRS
FileBuf = (unsigned char*)mmap(0, FileData.size(), PROT_READ|PROT_WRITE,
MAP_PRIVATE|MAP_ANONYMOUS, -1, 0);
assert((Buf != (unsigned char*)-1) && "mmap returned error!");
memcpy(Buf, &FileData[0], FileData.size());
#else
FileBuf = &FileData[0];
#endif
#if 0
// Allocate a new buffer to hold the bytecode...
unsigned char *ParseBegin=0;
unsigned Offset=0;
if ((intptr_t)Buffer & 3) {
delete [] Buffer;
Buffer = new unsigned char[Length+4];
Offset = 4-((intptr_t)Buffer & 3); // Make sure it's aligned
}
memcpy(Buffer+Offset, Buf, Length); // Copy it over
ParseBegin = Buffer+Offset;
#endif
ParseBytecode(FileBuf, FileData.size(), "<stdin>");
}
BytecodeStdinReader::~BytecodeStdinReader() {
#if ALIGN_PTRS
munmap((char*)FileBuf, FileData.size()); // Free mmap'd data area
#endif
}
///
///
AbstractModuleProvider*
getBytecodeBufferModuleProvider(const unsigned char *Buffer, unsigned Length,
const std::string &ModuleID) {
CHECK_ALIGN32(Buffer, Buffer+Length);
BytecodeParser *Parser = new BytecodeParser();
Parser->ParseBytecode(Buffer, Length, ModuleID);
return Parser;
}
Module *ParseBytecodeBuffer(const unsigned char *Buffer, unsigned Length,
const std::string &ModuleID, std::string *ErrorStr){
AbstractModuleProvider *AMP =
getBytecodeBufferModuleProvider(Buffer, Length, ModuleID);
Module *M = AMP->releaseModule();
delete AMP;
return M;
}
/// Parse and return a class file...
///
AbstractModuleProvider*
getBytecodeModuleProvider(const std::string &Filename) {
if (Filename != std::string("-")) // Read from a file...
return new BytecodeFileReader(Filename);
else // Read from stdin
return new BytecodeStdinReader();
}
Module *ParseBytecodeFile(const std::string &Filename, std::string *ErrorStr) {
AbstractModuleProvider *AMP = getBytecodeModuleProvider(Filename);
Module *M = AMP->releaseModule();
delete AMP;
return M;
}
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