mirror of
https://github.com/c64scene-ar/llvm-6502.git
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Move include/Config and include/Support into include/llvm/Config, include/llvm/ADT and include/llvm/Support. From here on out, all LLVM public header files must be under include/llvm/. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@16137 91177308-0d34-0410-b5e6-96231b3b80d8
1134 lines
39 KiB
C++
1134 lines
39 KiB
C++
//===-- Writer.cpp - Library for writing LLVM bytecode files --------------===//
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//
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// The LLVM Compiler Infrastructure
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//
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// This file was developed by the LLVM research group and is distributed under
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// the University of Illinois Open Source License. See LICENSE.TXT for details.
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//
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//===----------------------------------------------------------------------===//
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//
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// This library implements the functionality defined in llvm/Bytecode/Writer.h
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//
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// Note that this file uses an unusual technique of outputting all the bytecode
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// to a vector of unsigned char, then copies the vector to an ostream. The
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// reason for this is that we must do "seeking" in the stream to do back-
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// patching, and some very important ostreams that we want to support (like
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// pipes) do not support seeking. :( :( :(
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//
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//===----------------------------------------------------------------------===//
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#include "WriterInternals.h"
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#include "llvm/Bytecode/WriteBytecodePass.h"
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#include "llvm/Constants.h"
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#include "llvm/DerivedTypes.h"
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#include "llvm/Instructions.h"
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#include "llvm/Module.h"
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#include "llvm/SymbolTable.h"
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#include "llvm/Support/GetElementPtrTypeIterator.h"
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#include "llvm/ADT/STLExtras.h"
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#include "llvm/ADT/Statistic.h"
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#include <cstring>
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#include <algorithm>
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using namespace llvm;
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/// This value needs to be incremented every time the bytecode format changes
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/// so that the reader can distinguish which format of the bytecode file has
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/// been written.
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/// @brief The bytecode version number
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const unsigned BCVersionNum = 4;
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static RegisterPass<WriteBytecodePass> X("emitbytecode", "Bytecode Writer");
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static Statistic<>
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BytesWritten("bytecodewriter", "Number of bytecode bytes written");
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//===----------------------------------------------------------------------===//
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//=== Output Primitives ===//
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//===----------------------------------------------------------------------===//
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// output - If a position is specified, it must be in the valid portion of the
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// string... note that this should be inlined always so only the relevant IF
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// body should be included.
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inline void BytecodeWriter::output(unsigned i, int pos) {
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if (pos == -1) { // Be endian clean, little endian is our friend
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Out.push_back((unsigned char)i);
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Out.push_back((unsigned char)(i >> 8));
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Out.push_back((unsigned char)(i >> 16));
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Out.push_back((unsigned char)(i >> 24));
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} else {
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Out[pos ] = (unsigned char)i;
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Out[pos+1] = (unsigned char)(i >> 8);
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Out[pos+2] = (unsigned char)(i >> 16);
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Out[pos+3] = (unsigned char)(i >> 24);
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}
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}
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inline void BytecodeWriter::output(int i) {
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output((unsigned)i);
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}
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/// output_vbr - Output an unsigned value, by using the least number of bytes
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/// possible. This is useful because many of our "infinite" values are really
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/// very small most of the time; but can be large a few times.
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/// Data format used: If you read a byte with the high bit set, use the low
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/// seven bits as data and then read another byte.
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inline void BytecodeWriter::output_vbr(uint64_t i) {
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while (1) {
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if (i < 0x80) { // done?
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Out.push_back((unsigned char)i); // We know the high bit is clear...
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return;
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}
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// Nope, we are bigger than a character, output the next 7 bits and set the
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// high bit to say that there is more coming...
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Out.push_back(0x80 | ((unsigned char)i & 0x7F));
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i >>= 7; // Shift out 7 bits now...
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}
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}
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inline void BytecodeWriter::output_vbr(unsigned i) {
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while (1) {
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if (i < 0x80) { // done?
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Out.push_back((unsigned char)i); // We know the high bit is clear...
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return;
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}
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// Nope, we are bigger than a character, output the next 7 bits and set the
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// high bit to say that there is more coming...
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Out.push_back(0x80 | ((unsigned char)i & 0x7F));
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i >>= 7; // Shift out 7 bits now...
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}
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}
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inline void BytecodeWriter::output_typeid(unsigned i) {
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if (i <= 0x00FFFFFF)
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this->output_vbr(i);
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else {
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this->output_vbr(0x00FFFFFF);
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this->output_vbr(i);
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}
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}
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inline void BytecodeWriter::output_vbr(int64_t i) {
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if (i < 0)
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output_vbr(((uint64_t)(-i) << 1) | 1); // Set low order sign bit...
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else
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output_vbr((uint64_t)i << 1); // Low order bit is clear.
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}
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inline void BytecodeWriter::output_vbr(int i) {
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if (i < 0)
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output_vbr(((unsigned)(-i) << 1) | 1); // Set low order sign bit...
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else
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output_vbr((unsigned)i << 1); // Low order bit is clear.
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}
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inline void BytecodeWriter::output(const std::string &s) {
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unsigned Len = s.length();
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output_vbr(Len ); // Strings may have an arbitrary length...
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Out.insert(Out.end(), s.begin(), s.end());
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}
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inline void BytecodeWriter::output_data(const void *Ptr, const void *End) {
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Out.insert(Out.end(), (const unsigned char*)Ptr, (const unsigned char*)End);
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}
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inline void BytecodeWriter::output_float(float& FloatVal) {
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/// FIXME: This isn't optimal, it has size problems on some platforms
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/// where FP is not IEEE.
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union {
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float f;
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uint32_t i;
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} FloatUnion;
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FloatUnion.f = FloatVal;
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Out.push_back( static_cast<unsigned char>( (FloatUnion.i & 0xFF )));
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Out.push_back( static_cast<unsigned char>( (FloatUnion.i >> 8) & 0xFF));
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Out.push_back( static_cast<unsigned char>( (FloatUnion.i >> 16) & 0xFF));
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Out.push_back( static_cast<unsigned char>( (FloatUnion.i >> 24) & 0xFF));
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}
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inline void BytecodeWriter::output_double(double& DoubleVal) {
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/// FIXME: This isn't optimal, it has size problems on some platforms
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/// where FP is not IEEE.
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union {
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double d;
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uint64_t i;
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} DoubleUnion;
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DoubleUnion.d = DoubleVal;
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Out.push_back( static_cast<unsigned char>( (DoubleUnion.i & 0xFF )));
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Out.push_back( static_cast<unsigned char>( (DoubleUnion.i >> 8) & 0xFF));
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Out.push_back( static_cast<unsigned char>( (DoubleUnion.i >> 16) & 0xFF));
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Out.push_back( static_cast<unsigned char>( (DoubleUnion.i >> 24) & 0xFF));
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Out.push_back( static_cast<unsigned char>( (DoubleUnion.i >> 32) & 0xFF));
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Out.push_back( static_cast<unsigned char>( (DoubleUnion.i >> 40) & 0xFF));
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Out.push_back( static_cast<unsigned char>( (DoubleUnion.i >> 48) & 0xFF));
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Out.push_back( static_cast<unsigned char>( (DoubleUnion.i >> 56) & 0xFF));
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}
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inline BytecodeBlock::BytecodeBlock(unsigned ID, BytecodeWriter& w,
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bool elideIfEmpty, bool hasLongFormat )
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: Id(ID), Writer(w), ElideIfEmpty(elideIfEmpty), HasLongFormat(hasLongFormat){
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if (HasLongFormat) {
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w.output(ID);
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w.output(0U); // For length in long format
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} else {
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w.output(0U); /// Place holder for ID and length for this block
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}
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Loc = w.size();
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}
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inline BytecodeBlock::~BytecodeBlock() { // Do backpatch when block goes out
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// of scope...
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if (Loc == Writer.size() && ElideIfEmpty) {
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// If the block is empty, and we are allowed to, do not emit the block at
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// all!
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Writer.resize(Writer.size()-(HasLongFormat?8:4));
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return;
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}
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//cerr << "OldLoc = " << Loc << " NewLoc = " << NewLoc << " diff = "
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// << (NewLoc-Loc) << endl;
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if (HasLongFormat)
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Writer.output(unsigned(Writer.size()-Loc), int(Loc-4));
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else
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Writer.output(unsigned(Writer.size()-Loc) << 5 | (Id & 0x1F), int(Loc-4));
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}
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//===----------------------------------------------------------------------===//
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//=== Constant Output ===//
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//===----------------------------------------------------------------------===//
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void BytecodeWriter::outputType(const Type *T) {
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output_vbr((unsigned)T->getTypeID());
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// That's all there is to handling primitive types...
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if (T->isPrimitiveType()) {
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return; // We might do this if we alias a prim type: %x = type int
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}
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switch (T->getTypeID()) { // Handle derived types now.
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case Type::FunctionTyID: {
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const FunctionType *MT = cast<FunctionType>(T);
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int Slot = Table.getSlot(MT->getReturnType());
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assert(Slot != -1 && "Type used but not available!!");
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output_typeid((unsigned)Slot);
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// Output the number of arguments to function (+1 if varargs):
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output_vbr((unsigned)MT->getNumParams()+MT->isVarArg());
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// Output all of the arguments...
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FunctionType::param_iterator I = MT->param_begin();
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for (; I != MT->param_end(); ++I) {
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Slot = Table.getSlot(*I);
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assert(Slot != -1 && "Type used but not available!!");
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output_typeid((unsigned)Slot);
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}
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// Terminate list with VoidTy if we are a varargs function...
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if (MT->isVarArg())
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output_typeid((unsigned)Type::VoidTyID);
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break;
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}
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case Type::ArrayTyID: {
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const ArrayType *AT = cast<ArrayType>(T);
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int Slot = Table.getSlot(AT->getElementType());
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assert(Slot != -1 && "Type used but not available!!");
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output_typeid((unsigned)Slot);
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//std::cerr << "Type slot = " << Slot << " Type = " << T->getName() << endl;
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output_vbr(AT->getNumElements());
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break;
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}
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case Type::PackedTyID: {
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const PackedType *PT = cast<PackedType>(T);
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int Slot = Table.getSlot(PT->getElementType());
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assert(Slot != -1 && "Type used but not available!!");
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output_typeid((unsigned)Slot);
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output_vbr(PT->getNumElements());
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break;
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}
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case Type::StructTyID: {
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const StructType *ST = cast<StructType>(T);
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// Output all of the element types...
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for (StructType::element_iterator I = ST->element_begin(),
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E = ST->element_end(); I != E; ++I) {
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int Slot = Table.getSlot(*I);
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assert(Slot != -1 && "Type used but not available!!");
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output_typeid((unsigned)Slot);
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}
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// Terminate list with VoidTy
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output_typeid((unsigned)Type::VoidTyID);
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break;
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}
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case Type::PointerTyID: {
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const PointerType *PT = cast<PointerType>(T);
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int Slot = Table.getSlot(PT->getElementType());
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assert(Slot != -1 && "Type used but not available!!");
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output_typeid((unsigned)Slot);
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break;
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}
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case Type::OpaqueTyID: {
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// No need to emit anything, just the count of opaque types is enough.
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break;
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}
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//case Type::PackedTyID:
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default:
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std::cerr << __FILE__ << ":" << __LINE__ << ": Don't know how to serialize"
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<< " Type '" << T->getDescription() << "'\n";
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break;
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}
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}
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void BytecodeWriter::outputConstant(const Constant *CPV) {
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assert((CPV->getType()->isPrimitiveType() || !CPV->isNullValue()) &&
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"Shouldn't output null constants!");
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// We must check for a ConstantExpr before switching by type because
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// a ConstantExpr can be of any type, and has no explicit value.
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//
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if (const ConstantExpr *CE = dyn_cast<ConstantExpr>(CPV)) {
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// FIXME: Encoding of constant exprs could be much more compact!
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assert(CE->getNumOperands() > 0 && "ConstantExpr with 0 operands");
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output_vbr(CE->getNumOperands()); // flags as an expr
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output_vbr(CE->getOpcode()); // flags as an expr
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for (User::const_op_iterator OI = CE->op_begin(); OI != CE->op_end(); ++OI){
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int Slot = Table.getSlot(*OI);
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assert(Slot != -1 && "Unknown constant used in ConstantExpr!!");
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output_vbr((unsigned)Slot);
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Slot = Table.getSlot((*OI)->getType());
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output_typeid((unsigned)Slot);
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}
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return;
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} else {
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output_vbr(0U); // flag as not a ConstantExpr
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}
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switch (CPV->getType()->getTypeID()) {
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case Type::BoolTyID: // Boolean Types
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if (cast<ConstantBool>(CPV)->getValue())
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output_vbr(1U);
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else
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output_vbr(0U);
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break;
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case Type::UByteTyID: // Unsigned integer types...
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case Type::UShortTyID:
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case Type::UIntTyID:
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case Type::ULongTyID:
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output_vbr(cast<ConstantUInt>(CPV)->getValue());
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break;
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case Type::SByteTyID: // Signed integer types...
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case Type::ShortTyID:
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case Type::IntTyID:
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case Type::LongTyID:
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output_vbr(cast<ConstantSInt>(CPV)->getValue());
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break;
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case Type::ArrayTyID: {
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const ConstantArray *CPA = cast<ConstantArray>(CPV);
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assert(!CPA->isString() && "Constant strings should be handled specially!");
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for (unsigned i = 0, e = CPA->getNumOperands(); i != e; ++i) {
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int Slot = Table.getSlot(CPA->getOperand(i));
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assert(Slot != -1 && "Constant used but not available!!");
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output_vbr((unsigned)Slot);
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}
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break;
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}
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case Type::PackedTyID: {
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const ConstantPacked *CP = cast<ConstantPacked>(CPV);
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for (unsigned i = 0, e = CP->getNumOperands(); i != e; ++i) {
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int Slot = Table.getSlot(CP->getOperand(i));
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assert(Slot != -1 && "Constant used but not available!!");
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output_vbr((unsigned)Slot);
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}
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break;
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}
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case Type::StructTyID: {
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const ConstantStruct *CPS = cast<ConstantStruct>(CPV);
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for (unsigned i = 0, e = CPS->getNumOperands(); i != e; ++i) {
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int Slot = Table.getSlot(CPS->getOperand(i));
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assert(Slot != -1 && "Constant used but not available!!");
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output_vbr((unsigned)Slot);
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}
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break;
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}
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case Type::PointerTyID:
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assert(0 && "No non-null, non-constant-expr constants allowed!");
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abort();
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case Type::FloatTyID: { // Floating point types...
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float Tmp = (float)cast<ConstantFP>(CPV)->getValue();
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output_float(Tmp);
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break;
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}
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case Type::DoubleTyID: {
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double Tmp = cast<ConstantFP>(CPV)->getValue();
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output_double(Tmp);
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break;
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}
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case Type::VoidTyID:
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case Type::LabelTyID:
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default:
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std::cerr << __FILE__ << ":" << __LINE__ << ": Don't know how to serialize"
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<< " type '" << *CPV->getType() << "'\n";
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break;
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}
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return;
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}
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void BytecodeWriter::outputConstantStrings() {
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SlotCalculator::string_iterator I = Table.string_begin();
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SlotCalculator::string_iterator E = Table.string_end();
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if (I == E) return; // No strings to emit
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// If we have != 0 strings to emit, output them now. Strings are emitted into
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// the 'void' type plane.
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output_vbr(unsigned(E-I));
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output_typeid(Type::VoidTyID);
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// Emit all of the strings.
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for (I = Table.string_begin(); I != E; ++I) {
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const ConstantArray *Str = *I;
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int Slot = Table.getSlot(Str->getType());
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assert(Slot != -1 && "Constant string of unknown type?");
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output_typeid((unsigned)Slot);
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// Now that we emitted the type (which indicates the size of the string),
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// emit all of the characters.
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std::string Val = Str->getAsString();
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output_data(Val.c_str(), Val.c_str()+Val.size());
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}
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}
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//===----------------------------------------------------------------------===//
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//=== Instruction Output ===//
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//===----------------------------------------------------------------------===//
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typedef unsigned char uchar;
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// outputInstructionFormat0 - Output those wierd instructions that have a large
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// number of operands or have large operands themselves...
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//
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// Format: [opcode] [type] [numargs] [arg0] [arg1] ... [arg<numargs-1>]
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//
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void BytecodeWriter::outputInstructionFormat0(const Instruction *I, unsigned Opcode,
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const SlotCalculator &Table,
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unsigned Type) {
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// Opcode must have top two bits clear...
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output_vbr(Opcode << 2); // Instruction Opcode ID
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output_typeid(Type); // Result type
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unsigned NumArgs = I->getNumOperands();
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output_vbr(NumArgs + (isa<CastInst>(I) || isa<VANextInst>(I) ||
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isa<VAArgInst>(I)));
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if (!isa<GetElementPtrInst>(&I)) {
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for (unsigned i = 0; i < NumArgs; ++i) {
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int Slot = Table.getSlot(I->getOperand(i));
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assert(Slot >= 0 && "No slot number for value!?!?");
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output_vbr((unsigned)Slot);
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}
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if (isa<CastInst>(I) || isa<VAArgInst>(I)) {
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int Slot = Table.getSlot(I->getType());
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assert(Slot != -1 && "Cast return type unknown?");
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output_typeid((unsigned)Slot);
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} else if (const VANextInst *VAI = dyn_cast<VANextInst>(I)) {
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int Slot = Table.getSlot(VAI->getArgType());
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assert(Slot != -1 && "VarArg argument type unknown?");
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output_typeid((unsigned)Slot);
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}
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} else {
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int Slot = Table.getSlot(I->getOperand(0));
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assert(Slot >= 0 && "No slot number for value!?!?");
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output_vbr(unsigned(Slot));
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// We need to encode the type of sequential type indices into their slot #
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unsigned Idx = 1;
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for (gep_type_iterator TI = gep_type_begin(I), E = gep_type_end(I);
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Idx != NumArgs; ++TI, ++Idx) {
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Slot = Table.getSlot(I->getOperand(Idx));
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assert(Slot >= 0 && "No slot number for value!?!?");
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if (isa<SequentialType>(*TI)) {
|
|
unsigned IdxId;
|
|
switch (I->getOperand(Idx)->getType()->getTypeID()) {
|
|
default: assert(0 && "Unknown index type!");
|
|
case Type::UIntTyID: IdxId = 0; break;
|
|
case Type::IntTyID: IdxId = 1; break;
|
|
case Type::ULongTyID: IdxId = 2; break;
|
|
case Type::LongTyID: IdxId = 3; break;
|
|
}
|
|
Slot = (Slot << 2) | IdxId;
|
|
}
|
|
output_vbr(unsigned(Slot));
|
|
}
|
|
}
|
|
}
|
|
|
|
|
|
// outputInstrVarArgsCall - Output the absurdly annoying varargs function calls.
|
|
// This are more annoying than most because the signature of the call does not
|
|
// tell us anything about the types of the arguments in the varargs portion.
|
|
// Because of this, we encode (as type 0) all of the argument types explicitly
|
|
// before the argument value. This really sucks, but you shouldn't be using
|
|
// varargs functions in your code! *death to printf*!
|
|
//
|
|
// Format: [opcode] [type] [numargs] [arg0] [arg1] ... [arg<numargs-1>]
|
|
//
|
|
void BytecodeWriter::outputInstrVarArgsCall(const Instruction *I,
|
|
unsigned Opcode,
|
|
const SlotCalculator &Table,
|
|
unsigned Type) {
|
|
assert(isa<CallInst>(I) || isa<InvokeInst>(I));
|
|
// Opcode must have top two bits clear...
|
|
output_vbr(Opcode << 2); // Instruction Opcode ID
|
|
output_typeid(Type); // Result type (varargs type)
|
|
|
|
const PointerType *PTy = cast<PointerType>(I->getOperand(0)->getType());
|
|
const FunctionType *FTy = cast<FunctionType>(PTy->getElementType());
|
|
unsigned NumParams = FTy->getNumParams();
|
|
|
|
unsigned NumFixedOperands;
|
|
if (isa<CallInst>(I)) {
|
|
// Output an operand for the callee and each fixed argument, then two for
|
|
// each variable argument.
|
|
NumFixedOperands = 1+NumParams;
|
|
} else {
|
|
assert(isa<InvokeInst>(I) && "Not call or invoke??");
|
|
// Output an operand for the callee and destinations, then two for each
|
|
// variable argument.
|
|
NumFixedOperands = 3+NumParams;
|
|
}
|
|
output_vbr(2 * I->getNumOperands()-NumFixedOperands);
|
|
|
|
// The type for the function has already been emitted in the type field of the
|
|
// instruction. Just emit the slot # now.
|
|
for (unsigned i = 0; i != NumFixedOperands; ++i) {
|
|
int Slot = Table.getSlot(I->getOperand(i));
|
|
assert(Slot >= 0 && "No slot number for value!?!?");
|
|
output_vbr((unsigned)Slot);
|
|
}
|
|
|
|
for (unsigned i = NumFixedOperands, e = I->getNumOperands(); i != e; ++i) {
|
|
// Output Arg Type ID
|
|
int Slot = Table.getSlot(I->getOperand(i)->getType());
|
|
assert(Slot >= 0 && "No slot number for value!?!?");
|
|
output_typeid((unsigned)Slot);
|
|
|
|
// Output arg ID itself
|
|
Slot = Table.getSlot(I->getOperand(i));
|
|
assert(Slot >= 0 && "No slot number for value!?!?");
|
|
output_vbr((unsigned)Slot);
|
|
}
|
|
}
|
|
|
|
|
|
// outputInstructionFormat1 - Output one operand instructions, knowing that no
|
|
// operand index is >= 2^12.
|
|
//
|
|
inline void BytecodeWriter::outputInstructionFormat1(const Instruction *I,
|
|
unsigned Opcode,
|
|
unsigned *Slots,
|
|
unsigned Type) {
|
|
// bits Instruction format:
|
|
// --------------------------
|
|
// 01-00: Opcode type, fixed to 1.
|
|
// 07-02: Opcode
|
|
// 19-08: Resulting type plane
|
|
// 31-20: Operand #1 (if set to (2^12-1), then zero operands)
|
|
//
|
|
unsigned Bits = 1 | (Opcode << 2) | (Type << 8) | (Slots[0] << 20);
|
|
// cerr << "1 " << IType << " " << Type << " " << Slots[0] << endl;
|
|
output(Bits);
|
|
}
|
|
|
|
|
|
// outputInstructionFormat2 - Output two operand instructions, knowing that no
|
|
// operand index is >= 2^8.
|
|
//
|
|
inline void BytecodeWriter::outputInstructionFormat2(const Instruction *I,
|
|
unsigned Opcode,
|
|
unsigned *Slots,
|
|
unsigned Type) {
|
|
// bits Instruction format:
|
|
// --------------------------
|
|
// 01-00: Opcode type, fixed to 2.
|
|
// 07-02: Opcode
|
|
// 15-08: Resulting type plane
|
|
// 23-16: Operand #1
|
|
// 31-24: Operand #2
|
|
//
|
|
unsigned Bits = 2 | (Opcode << 2) | (Type << 8) |
|
|
(Slots[0] << 16) | (Slots[1] << 24);
|
|
// cerr << "2 " << IType << " " << Type << " " << Slots[0] << " "
|
|
// << Slots[1] << endl;
|
|
output(Bits);
|
|
}
|
|
|
|
|
|
// outputInstructionFormat3 - Output three operand instructions, knowing that no
|
|
// operand index is >= 2^6.
|
|
//
|
|
inline void BytecodeWriter::outputInstructionFormat3(const Instruction *I,
|
|
unsigned Opcode,
|
|
unsigned *Slots,
|
|
unsigned Type) {
|
|
// bits Instruction format:
|
|
// --------------------------
|
|
// 01-00: Opcode type, fixed to 3.
|
|
// 07-02: Opcode
|
|
// 13-08: Resulting type plane
|
|
// 19-14: Operand #1
|
|
// 25-20: Operand #2
|
|
// 31-26: Operand #3
|
|
//
|
|
unsigned Bits = 3 | (Opcode << 2) | (Type << 8) |
|
|
(Slots[0] << 14) | (Slots[1] << 20) | (Slots[2] << 26);
|
|
//cerr << "3 " << IType << " " << Type << " " << Slots[0] << " "
|
|
// << Slots[1] << " " << Slots[2] << endl;
|
|
output(Bits);
|
|
}
|
|
|
|
void BytecodeWriter::outputInstruction(const Instruction &I) {
|
|
assert(I.getOpcode() < 62 && "Opcode too big???");
|
|
unsigned Opcode = I.getOpcode();
|
|
unsigned NumOperands = I.getNumOperands();
|
|
|
|
// Encode 'volatile load' as 62 and 'volatile store' as 63.
|
|
if (isa<LoadInst>(I) && cast<LoadInst>(I).isVolatile())
|
|
Opcode = 62;
|
|
if (isa<StoreInst>(I) && cast<StoreInst>(I).isVolatile())
|
|
Opcode = 63;
|
|
|
|
// Figure out which type to encode with the instruction. Typically we want
|
|
// the type of the first parameter, as opposed to the type of the instruction
|
|
// (for example, with setcc, we always know it returns bool, but the type of
|
|
// the first param is actually interesting). But if we have no arguments
|
|
// we take the type of the instruction itself.
|
|
//
|
|
const Type *Ty;
|
|
switch (I.getOpcode()) {
|
|
case Instruction::Select:
|
|
case Instruction::Malloc:
|
|
case Instruction::Alloca:
|
|
Ty = I.getType(); // These ALWAYS want to encode the return type
|
|
break;
|
|
case Instruction::Store:
|
|
Ty = I.getOperand(1)->getType(); // Encode the pointer type...
|
|
assert(isa<PointerType>(Ty) && "Store to nonpointer type!?!?");
|
|
break;
|
|
default: // Otherwise use the default behavior...
|
|
Ty = NumOperands ? I.getOperand(0)->getType() : I.getType();
|
|
break;
|
|
}
|
|
|
|
unsigned Type;
|
|
int Slot = Table.getSlot(Ty);
|
|
assert(Slot != -1 && "Type not available!!?!");
|
|
Type = (unsigned)Slot;
|
|
|
|
// Varargs calls and invokes are encoded entirely different from any other
|
|
// instructions.
|
|
if (const CallInst *CI = dyn_cast<CallInst>(&I)){
|
|
const PointerType *Ty =cast<PointerType>(CI->getCalledValue()->getType());
|
|
if (cast<FunctionType>(Ty->getElementType())->isVarArg()) {
|
|
outputInstrVarArgsCall(CI, Opcode, Table, Type);
|
|
return;
|
|
}
|
|
} else if (const InvokeInst *II = dyn_cast<InvokeInst>(&I)) {
|
|
const PointerType *Ty =cast<PointerType>(II->getCalledValue()->getType());
|
|
if (cast<FunctionType>(Ty->getElementType())->isVarArg()) {
|
|
outputInstrVarArgsCall(II, Opcode, Table, Type);
|
|
return;
|
|
}
|
|
}
|
|
|
|
if (NumOperands <= 3) {
|
|
// Make sure that we take the type number into consideration. We don't want
|
|
// to overflow the field size for the instruction format we select.
|
|
//
|
|
unsigned MaxOpSlot = Type;
|
|
unsigned Slots[3]; Slots[0] = (1 << 12)-1; // Marker to signify 0 operands
|
|
|
|
for (unsigned i = 0; i != NumOperands; ++i) {
|
|
int slot = Table.getSlot(I.getOperand(i));
|
|
assert(slot != -1 && "Broken bytecode!");
|
|
if (unsigned(slot) > MaxOpSlot) MaxOpSlot = unsigned(slot);
|
|
Slots[i] = unsigned(slot);
|
|
}
|
|
|
|
// Handle the special cases for various instructions...
|
|
if (isa<CastInst>(I) || isa<VAArgInst>(I)) {
|
|
// Cast has to encode the destination type as the second argument in the
|
|
// packet, or else we won't know what type to cast to!
|
|
Slots[1] = Table.getSlot(I.getType());
|
|
assert(Slots[1] != ~0U && "Cast return type unknown?");
|
|
if (Slots[1] > MaxOpSlot) MaxOpSlot = Slots[1];
|
|
NumOperands++;
|
|
} else if (const VANextInst *VANI = dyn_cast<VANextInst>(&I)) {
|
|
Slots[1] = Table.getSlot(VANI->getArgType());
|
|
assert(Slots[1] != ~0U && "va_next return type unknown?");
|
|
if (Slots[1] > MaxOpSlot) MaxOpSlot = Slots[1];
|
|
NumOperands++;
|
|
} else if (const GetElementPtrInst *GEP = dyn_cast<GetElementPtrInst>(&I)) {
|
|
// We need to encode the type of sequential type indices into their slot #
|
|
unsigned Idx = 1;
|
|
for (gep_type_iterator I = gep_type_begin(GEP), E = gep_type_end(GEP);
|
|
I != E; ++I, ++Idx)
|
|
if (isa<SequentialType>(*I)) {
|
|
unsigned IdxId;
|
|
switch (GEP->getOperand(Idx)->getType()->getTypeID()) {
|
|
default: assert(0 && "Unknown index type!");
|
|
case Type::UIntTyID: IdxId = 0; break;
|
|
case Type::IntTyID: IdxId = 1; break;
|
|
case Type::ULongTyID: IdxId = 2; break;
|
|
case Type::LongTyID: IdxId = 3; break;
|
|
}
|
|
Slots[Idx] = (Slots[Idx] << 2) | IdxId;
|
|
if (Slots[Idx] > MaxOpSlot) MaxOpSlot = Slots[Idx];
|
|
}
|
|
}
|
|
|
|
// Decide which instruction encoding to use. This is determined primarily
|
|
// by the number of operands, and secondarily by whether or not the max
|
|
// operand will fit into the instruction encoding. More operands == fewer
|
|
// bits per operand.
|
|
//
|
|
switch (NumOperands) {
|
|
case 0:
|
|
case 1:
|
|
if (MaxOpSlot < (1 << 12)-1) { // -1 because we use 4095 to indicate 0 ops
|
|
outputInstructionFormat1(&I, Opcode, Slots, Type);
|
|
return;
|
|
}
|
|
break;
|
|
|
|
case 2:
|
|
if (MaxOpSlot < (1 << 8)) {
|
|
outputInstructionFormat2(&I, Opcode, Slots, Type);
|
|
return;
|
|
}
|
|
break;
|
|
|
|
case 3:
|
|
if (MaxOpSlot < (1 << 6)) {
|
|
outputInstructionFormat3(&I, Opcode, Slots, Type);
|
|
return;
|
|
}
|
|
break;
|
|
default:
|
|
break;
|
|
}
|
|
}
|
|
|
|
// If we weren't handled before here, we either have a large number of
|
|
// operands or a large operand index that we are referring to.
|
|
outputInstructionFormat0(&I, Opcode, Table, Type);
|
|
}
|
|
|
|
//===----------------------------------------------------------------------===//
|
|
//=== Block Output ===//
|
|
//===----------------------------------------------------------------------===//
|
|
|
|
BytecodeWriter::BytecodeWriter(std::vector<unsigned char> &o, const Module *M)
|
|
: Out(o), Table(M) {
|
|
|
|
// Emit the signature...
|
|
static const unsigned char *Sig = (const unsigned char*)"llvm";
|
|
output_data(Sig, Sig+4);
|
|
|
|
// Emit the top level CLASS block.
|
|
BytecodeBlock ModuleBlock(BytecodeFormat::ModuleBlockID, *this, false, true);
|
|
|
|
bool isBigEndian = M->getEndianness() == Module::BigEndian;
|
|
bool hasLongPointers = M->getPointerSize() == Module::Pointer64;
|
|
bool hasNoEndianness = M->getEndianness() == Module::AnyEndianness;
|
|
bool hasNoPointerSize = M->getPointerSize() == Module::AnyPointerSize;
|
|
|
|
// Output the version identifier... we are currently on bytecode version #2,
|
|
// which corresponds to LLVM v1.3.
|
|
unsigned Version = (BCVersionNum << 4) |
|
|
(unsigned)isBigEndian | (hasLongPointers << 1) |
|
|
(hasNoEndianness << 2) |
|
|
(hasNoPointerSize << 3);
|
|
output_vbr(Version);
|
|
|
|
// The Global type plane comes first
|
|
{
|
|
BytecodeBlock CPool(BytecodeFormat::GlobalTypePlaneBlockID, *this );
|
|
outputTypes(Type::FirstDerivedTyID);
|
|
}
|
|
|
|
// The ModuleInfoBlock follows directly after the type information
|
|
outputModuleInfoBlock(M);
|
|
|
|
// Output module level constants, used for global variable initializers
|
|
outputConstants(false);
|
|
|
|
// Do the whole module now! Process each function at a time...
|
|
for (Module::const_iterator I = M->begin(), E = M->end(); I != E; ++I)
|
|
outputFunction(I);
|
|
|
|
// If needed, output the symbol table for the module...
|
|
outputSymbolTable(M->getSymbolTable());
|
|
}
|
|
|
|
void BytecodeWriter::outputTypes(unsigned TypeNum)
|
|
{
|
|
// Write the type plane for types first because earlier planes (e.g. for a
|
|
// primitive type like float) may have constants constructed using types
|
|
// coming later (e.g., via getelementptr from a pointer type). The type
|
|
// plane is needed before types can be fwd or bkwd referenced.
|
|
const std::vector<const Type*>& Types = Table.getTypes();
|
|
assert(!Types.empty() && "No types at all?");
|
|
assert(TypeNum <= Types.size() && "Invalid TypeNo index");
|
|
|
|
unsigned NumEntries = Types.size() - TypeNum;
|
|
|
|
// Output type header: [num entries]
|
|
output_vbr(NumEntries);
|
|
|
|
for (unsigned i = TypeNum; i < TypeNum+NumEntries; ++i)
|
|
outputType(Types[i]);
|
|
}
|
|
|
|
// Helper function for outputConstants().
|
|
// Writes out all the constants in the plane Plane starting at entry StartNo.
|
|
//
|
|
void BytecodeWriter::outputConstantsInPlane(const std::vector<const Value*>
|
|
&Plane, unsigned StartNo) {
|
|
unsigned ValNo = StartNo;
|
|
|
|
// Scan through and ignore function arguments, global values, and constant
|
|
// strings.
|
|
for (; ValNo < Plane.size() &&
|
|
(isa<Argument>(Plane[ValNo]) || isa<GlobalValue>(Plane[ValNo]) ||
|
|
(isa<ConstantArray>(Plane[ValNo]) &&
|
|
cast<ConstantArray>(Plane[ValNo])->isString())); ValNo++)
|
|
/*empty*/;
|
|
|
|
unsigned NC = ValNo; // Number of constants
|
|
for (; NC < Plane.size() && (isa<Constant>(Plane[NC])); NC++)
|
|
/*empty*/;
|
|
NC -= ValNo; // Convert from index into count
|
|
if (NC == 0) return; // Skip empty type planes...
|
|
|
|
// FIXME: Most slabs only have 1 or 2 entries! We should encode this much
|
|
// more compactly.
|
|
|
|
// Output type header: [num entries][type id number]
|
|
//
|
|
output_vbr(NC);
|
|
|
|
// Output the Type ID Number...
|
|
int Slot = Table.getSlot(Plane.front()->getType());
|
|
assert (Slot != -1 && "Type in constant pool but not in function!!");
|
|
output_typeid((unsigned)Slot);
|
|
|
|
for (unsigned i = ValNo; i < ValNo+NC; ++i) {
|
|
const Value *V = Plane[i];
|
|
if (const Constant *C = dyn_cast<Constant>(V)) {
|
|
outputConstant(C);
|
|
}
|
|
}
|
|
}
|
|
|
|
static inline bool hasNullValue(unsigned TyID) {
|
|
return TyID != Type::LabelTyID && TyID != Type::VoidTyID;
|
|
}
|
|
|
|
void BytecodeWriter::outputConstants(bool isFunction) {
|
|
BytecodeBlock CPool(BytecodeFormat::ConstantPoolBlockID, *this,
|
|
true /* Elide block if empty */);
|
|
|
|
unsigned NumPlanes = Table.getNumPlanes();
|
|
|
|
if (isFunction)
|
|
// Output the type plane before any constants!
|
|
outputTypes( Table.getModuleTypeLevel() );
|
|
else
|
|
// Output module-level string constants before any other constants.x
|
|
outputConstantStrings();
|
|
|
|
for (unsigned pno = 0; pno != NumPlanes; pno++) {
|
|
const std::vector<const Value*> &Plane = Table.getPlane(pno);
|
|
if (!Plane.empty()) { // Skip empty type planes...
|
|
unsigned ValNo = 0;
|
|
if (isFunction) // Don't re-emit module constants
|
|
ValNo += Table.getModuleLevel(pno);
|
|
|
|
if (hasNullValue(pno)) {
|
|
// Skip zero initializer
|
|
if (ValNo == 0)
|
|
ValNo = 1;
|
|
}
|
|
|
|
// Write out constants in the plane
|
|
outputConstantsInPlane(Plane, ValNo);
|
|
}
|
|
}
|
|
}
|
|
|
|
static unsigned getEncodedLinkage(const GlobalValue *GV) {
|
|
switch (GV->getLinkage()) {
|
|
default: assert(0 && "Invalid linkage!");
|
|
case GlobalValue::ExternalLinkage: return 0;
|
|
case GlobalValue::WeakLinkage: return 1;
|
|
case GlobalValue::AppendingLinkage: return 2;
|
|
case GlobalValue::InternalLinkage: return 3;
|
|
case GlobalValue::LinkOnceLinkage: return 4;
|
|
}
|
|
}
|
|
|
|
void BytecodeWriter::outputModuleInfoBlock(const Module *M) {
|
|
BytecodeBlock ModuleInfoBlock(BytecodeFormat::ModuleGlobalInfoBlockID, *this);
|
|
|
|
// Output the types for the global variables in the module...
|
|
for (Module::const_giterator I = M->gbegin(), End = M->gend(); I != End;++I) {
|
|
int Slot = Table.getSlot(I->getType());
|
|
assert(Slot != -1 && "Module global vars is broken!");
|
|
|
|
// Fields: bit0 = isConstant, bit1 = hasInitializer, bit2-4=Linkage,
|
|
// bit5+ = Slot # for type
|
|
unsigned oSlot = ((unsigned)Slot << 5) | (getEncodedLinkage(I) << 2) |
|
|
(I->hasInitializer() << 1) | (unsigned)I->isConstant();
|
|
output_vbr(oSlot );
|
|
|
|
// If we have an initializer, output it now.
|
|
if (I->hasInitializer()) {
|
|
Slot = Table.getSlot((Value*)I->getInitializer());
|
|
assert(Slot != -1 && "No slot for global var initializer!");
|
|
output_vbr((unsigned)Slot);
|
|
}
|
|
}
|
|
output_typeid((unsigned)Table.getSlot(Type::VoidTy));
|
|
|
|
// Output the types of the functions in this module...
|
|
for (Module::const_iterator I = M->begin(), End = M->end(); I != End; ++I) {
|
|
int Slot = Table.getSlot(I->getType());
|
|
assert(Slot != -1 && "Module const pool is broken!");
|
|
assert(Slot >= Type::FirstDerivedTyID && "Derived type not in range!");
|
|
output_typeid((unsigned)Slot);
|
|
}
|
|
output_typeid((unsigned)Table.getSlot(Type::VoidTy));
|
|
|
|
// Put out the list of dependent libraries for the Module
|
|
Module::lib_iterator LI = M->lib_begin();
|
|
Module::lib_iterator LE = M->lib_end();
|
|
output_vbr( unsigned(LE - LI) ); // Put out the number of dependent libraries
|
|
for ( ; LI != LE; ++LI ) {
|
|
output(*LI);
|
|
}
|
|
|
|
// Output the target triple from the module
|
|
output(M->getTargetTriple());
|
|
}
|
|
|
|
void BytecodeWriter::outputInstructions(const Function *F) {
|
|
BytecodeBlock ILBlock(BytecodeFormat::InstructionListBlockID, *this);
|
|
for (Function::const_iterator BB = F->begin(), E = F->end(); BB != E; ++BB)
|
|
for (BasicBlock::const_iterator I = BB->begin(), E = BB->end(); I!=E; ++I)
|
|
outputInstruction(*I);
|
|
}
|
|
|
|
void BytecodeWriter::outputFunction(const Function *F) {
|
|
BytecodeBlock FunctionBlock(BytecodeFormat::FunctionBlockID, *this);
|
|
output_vbr(getEncodedLinkage(F));
|
|
|
|
// If this is an external function, there is nothing else to emit!
|
|
if (F->isExternal()) return;
|
|
|
|
// Get slot information about the function...
|
|
Table.incorporateFunction(F);
|
|
|
|
if (Table.getCompactionTable().empty()) {
|
|
// Output information about the constants in the function if the compaction
|
|
// table is not being used.
|
|
outputConstants(true);
|
|
} else {
|
|
// Otherwise, emit the compaction table.
|
|
outputCompactionTable();
|
|
}
|
|
|
|
// Output all of the instructions in the body of the function
|
|
outputInstructions(F);
|
|
|
|
// If needed, output the symbol table for the function...
|
|
outputSymbolTable(F->getSymbolTable());
|
|
|
|
Table.purgeFunction();
|
|
}
|
|
|
|
void BytecodeWriter::outputCompactionTablePlane(unsigned PlaneNo,
|
|
const std::vector<const Value*> &Plane,
|
|
unsigned StartNo) {
|
|
unsigned End = Table.getModuleLevel(PlaneNo);
|
|
if (Plane.empty() || StartNo == End || End == 0) return; // Nothing to emit
|
|
assert(StartNo < End && "Cannot emit negative range!");
|
|
assert(StartNo < Plane.size() && End <= Plane.size());
|
|
|
|
// Do not emit the null initializer!
|
|
++StartNo;
|
|
|
|
// Figure out which encoding to use. By far the most common case we have is
|
|
// to emit 0-2 entries in a compaction table plane.
|
|
switch (End-StartNo) {
|
|
case 0: // Avoid emitting two vbr's if possible.
|
|
case 1:
|
|
case 2:
|
|
output_vbr((PlaneNo << 2) | End-StartNo);
|
|
break;
|
|
default:
|
|
// Output the number of things.
|
|
output_vbr((unsigned(End-StartNo) << 2) | 3);
|
|
output_typeid(PlaneNo); // Emit the type plane this is
|
|
break;
|
|
}
|
|
|
|
for (unsigned i = StartNo; i != End; ++i)
|
|
output_vbr(Table.getGlobalSlot(Plane[i]));
|
|
}
|
|
|
|
void BytecodeWriter::outputCompactionTypes(unsigned StartNo) {
|
|
// Get the compaction type table from the slot calculator
|
|
const std::vector<const Type*> &CTypes = Table.getCompactionTypes();
|
|
|
|
// The compaction types may have been uncompactified back to the
|
|
// global types. If so, we just write an empty table
|
|
if (CTypes.size() == 0 ) {
|
|
output_vbr(0U);
|
|
return;
|
|
}
|
|
|
|
assert(CTypes.size() >= StartNo && "Invalid compaction types start index");
|
|
|
|
// Determine how many types to write
|
|
unsigned NumTypes = CTypes.size() - StartNo;
|
|
|
|
// Output the number of types.
|
|
output_vbr(NumTypes);
|
|
|
|
for (unsigned i = StartNo; i < StartNo+NumTypes; ++i)
|
|
output_typeid(Table.getGlobalSlot(CTypes[i]));
|
|
}
|
|
|
|
void BytecodeWriter::outputCompactionTable() {
|
|
// Avoid writing the compaction table at all if there is no content.
|
|
if (Table.getCompactionTypes().size() >= Type::FirstDerivedTyID ||
|
|
(!Table.CompactionTableIsEmpty())) {
|
|
BytecodeBlock CTB(BytecodeFormat::CompactionTableBlockID, *this,
|
|
true/*ElideIfEmpty*/);
|
|
const std::vector<std::vector<const Value*> > &CT =Table.getCompactionTable();
|
|
|
|
// First things first, emit the type compaction table if there is one.
|
|
outputCompactionTypes(Type::FirstDerivedTyID);
|
|
|
|
for (unsigned i = 0, e = CT.size(); i != e; ++i)
|
|
outputCompactionTablePlane(i, CT[i], 0);
|
|
}
|
|
}
|
|
|
|
void BytecodeWriter::outputSymbolTable(const SymbolTable &MST) {
|
|
// Do not output the Bytecode block for an empty symbol table, it just wastes
|
|
// space!
|
|
if ( MST.isEmpty() ) return;
|
|
|
|
BytecodeBlock SymTabBlock(BytecodeFormat::SymbolTableBlockID, *this,
|
|
true/* ElideIfEmpty*/);
|
|
|
|
// Write the number of types
|
|
output_vbr(MST.num_types());
|
|
|
|
// Write each of the types
|
|
for (SymbolTable::type_const_iterator TI = MST.type_begin(),
|
|
TE = MST.type_end(); TI != TE; ++TI ) {
|
|
// Symtab entry:[def slot #][name]
|
|
output_typeid((unsigned)Table.getSlot(TI->second));
|
|
output(TI->first);
|
|
}
|
|
|
|
// Now do each of the type planes in order.
|
|
for (SymbolTable::plane_const_iterator PI = MST.plane_begin(),
|
|
PE = MST.plane_end(); PI != PE; ++PI) {
|
|
SymbolTable::value_const_iterator I = MST.value_begin(PI->first);
|
|
SymbolTable::value_const_iterator End = MST.value_end(PI->first);
|
|
int Slot;
|
|
|
|
if (I == End) continue; // Don't mess with an absent type...
|
|
|
|
// Write the number of values in this plane
|
|
output_vbr(MST.type_size(PI->first));
|
|
|
|
// Write the slot number of the type for this plane
|
|
Slot = Table.getSlot(PI->first);
|
|
assert(Slot != -1 && "Type in symtab, but not in table!");
|
|
output_typeid((unsigned)Slot);
|
|
|
|
// Write each of the values in this plane
|
|
for (; I != End; ++I) {
|
|
// Symtab entry: [def slot #][name]
|
|
Slot = Table.getSlot(I->second);
|
|
assert(Slot != -1 && "Value in symtab but has no slot number!!");
|
|
output_vbr((unsigned)Slot);
|
|
output(I->first);
|
|
}
|
|
}
|
|
}
|
|
|
|
void llvm::WriteBytecodeToFile(const Module *M, std::ostream &Out) {
|
|
assert(M && "You can't write a null module!!");
|
|
|
|
std::vector<unsigned char> Buffer;
|
|
Buffer.reserve(64 * 1024); // avoid lots of little reallocs
|
|
|
|
// This object populates buffer for us...
|
|
BytecodeWriter BCW(Buffer, M);
|
|
|
|
// Keep track of how much we've written...
|
|
BytesWritten += Buffer.size();
|
|
|
|
// Okay, write the deque out to the ostream now... the deque is not
|
|
// sequential in memory, however, so write out as much as possible in big
|
|
// chunks, until we're done.
|
|
//
|
|
|
|
std::vector<unsigned char>::const_iterator I = Buffer.begin(),E = Buffer.end();
|
|
while (I != E) { // Loop until it's all written
|
|
// Scan to see how big this chunk is...
|
|
const unsigned char *ChunkPtr = &*I;
|
|
const unsigned char *LastPtr = ChunkPtr;
|
|
while (I != E) {
|
|
const unsigned char *ThisPtr = &*++I;
|
|
if (++LastPtr != ThisPtr) // Advanced by more than a byte of memory?
|
|
break;
|
|
}
|
|
|
|
// Write out the chunk...
|
|
Out.write((char*)ChunkPtr, unsigned(LastPtr-ChunkPtr));
|
|
}
|
|
Out.flush();
|
|
}
|
|
|
|
// vim: sw=2 ai
|