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//===-- WriterPrimitives.h - Bytecode writer file format prims --*- C++ -*-===//
//
// The LLVM Compiler Infrastructure
//
// This file was developed by the LLVM research group and is distributed under
// the University of Illinois Open Source License. See LICENSE.TXT for details.
//
//===----------------------------------------------------------------------===//
//
// This header defines some basic functions for writing basic primitive types to
// a bytecode stream.
//
//===----------------------------------------------------------------------===//
#ifndef WRITERPRIMITIVES_H
#define WRITERPRIMITIVES_H
#include "Support/DataTypes.h"
#include <string>
#include <deque>
namespace llvm {
// output - If a position is specified, it must be in the valid portion of the
// string... note that this should be inlined always so only the relevant IF
// body should be included...
//
static inline void output(unsigned i, std::deque<unsigned char> &Out,
int pos = -1) {
if (pos == -1) { // Be endian clean, little endian is our friend
Out.push_back((unsigned char)i);
Out.push_back((unsigned char)(i >> 8));
Out.push_back((unsigned char)(i >> 16));
Out.push_back((unsigned char)(i >> 24));
} else {
Out[pos ] = (unsigned char)i;
Out[pos+1] = (unsigned char)(i >> 8);
Out[pos+2] = (unsigned char)(i >> 16);
Out[pos+3] = (unsigned char)(i >> 24);
}
}
static inline void output(int i, std::deque<unsigned char> &Out) {
output((unsigned)i, Out);
}
// output_vbr - Output an unsigned value, by using the least number of bytes
// possible. This is useful because many of our "infinite" values are really
// very small most of the time... but can be large a few times...
//
// Data format used: If you read a byte with the night bit set, use the low
// seven bits as data and then read another byte...
//
// Note that using this may cause the output buffer to become unaligned...
//
static inline void output_vbr(uint64_t i, std::deque<unsigned char> &out) {
while (1) {
if (i < 0x80) { // done?
out.push_back((unsigned char)i); // We know the high bit is clear...
return;
}
// Nope, we are bigger than a character, output the next 7 bits and set the
// high bit to say that there is more coming...
out.push_back(0x80 | ((unsigned char)i & 0x7F));
i >>= 7; // Shift out 7 bits now...
}
}
static inline void output_vbr(unsigned i, std::deque<unsigned char> &out) {
while (1) {
if (i < 0x80) { // done?
out.push_back((unsigned char)i); // We know the high bit is clear...
return;
}
// Nope, we are bigger than a character, output the next 7 bits and set the
// high bit to say that there is more coming...
out.push_back(0x80 | ((unsigned char)i & 0x7F));
i >>= 7; // Shift out 7 bits now...
}
}
static inline void output_vbr(int64_t i, std::deque<unsigned char> &out) {
if (i < 0)
output_vbr(((uint64_t)(-i) << 1) | 1, out); // Set low order sign bit...
else
output_vbr((uint64_t)i << 1, out); // Low order bit is clear.
}
static inline void output_vbr(int i, std::deque<unsigned char> &out) {
if (i < 0)
output_vbr(((unsigned)(-i) << 1) | 1, out); // Set low order sign bit...
else
output_vbr((unsigned)i << 1, out); // Low order bit is clear.
}
// align32 - emit the minimal number of bytes that will bring us to 32 bit
// alignment...
//
static inline void align32(std::deque<unsigned char> &Out) {
int NumPads = (4-(Out.size() & 3)) & 3; // Bytes to get padding to 32 bits
while (NumPads--) Out.push_back((unsigned char)0xAB);
}
static inline void output(const std::string &s, std::deque<unsigned char> &Out,
bool Aligned = true) {
unsigned Len = s.length();
output_vbr(Len, Out); // Strings may have an arbitrary length...
Out.insert(Out.end(), s.begin(), s.end());
if (Aligned)
align32(Out); // Make sure we are now aligned...
}
static inline void output_data(const void *Ptr, const void *End,
std::deque<unsigned char> &Out) {
Out.insert(Out.end(), (const unsigned char*)Ptr, (const unsigned char*)End);
}
static inline void output_float(float& FloatVal,
std::deque<unsigned char>& Out) {
/// FIXME: This is a broken implementation! It writes
/// it in a platform-specific endianess. Need to make
/// it little endian always.
output_data(&FloatVal, &FloatVal+1, Out);
}
static inline void output_double(double& DoubleVal,
std::deque<unsigned char>& Out) {
/// FIXME: This is a broken implementation! It writes
/// it in a platform-specific endianess. Need to make
/// it little endian always.
output_data(&DoubleVal, &DoubleVal+1, Out);
}
} // End llvm namespace
// vim: sw=2 ai
#endif
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