mirror of
https://github.com/c64scene-ar/llvm-6502.git
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d70684f758
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@598 91177308-0d34-0410-b5e6-96231b3b80d8
241 lines
8.4 KiB
C++
241 lines
8.4 KiB
C++
//===-- Writer.cpp - Library for writing VM bytecode files -------*- C++ -*--=//
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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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// This library uses the Analysis library to figure out offsets for
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// variables in the method tables...
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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 deque of unsigned char's, then copies the deque 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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// The choice of the deque data structure is influenced by the extremely fast
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// "append" speed, plus the free "seek"/replace in the middle of the stream. I
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// didn't use a vector because the stream could end up very large and copying
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// the whole thing to reallocate would be kinda silly.
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//
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// Note that the performance of this library is not terribly important, because
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// it shouldn't be used by JIT type applications... so it is not a huge focus
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// at least. :)
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//
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//===----------------------------------------------------------------------===//
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#include "WriterInternals.h"
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#include "llvm/Module.h"
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#include "llvm/GlobalVariable.h"
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#include "llvm/Method.h"
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#include "llvm/BasicBlock.h"
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#include "llvm/ConstPoolVals.h"
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#include "llvm/SymbolTable.h"
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#include "llvm/DerivedTypes.h"
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#include "llvm/Support/STLExtras.h"
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#include <string.h>
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#include <algorithm>
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BytecodeWriter::BytecodeWriter(deque<unsigned char> &o, const Module *M)
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: Out(o), Table(M, false) {
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outputSignature();
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// Emit the top level CLASS block.
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BytecodeBlock ModuleBlock(BytecodeFormat::Module, Out);
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// Output the ID of first "derived" type:
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output_vbr((unsigned)Type::FirstDerivedTyID, Out);
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align32(Out);
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// Output module level constants, including types used by the method protos
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outputConstants(false);
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// The ModuleInfoBlock follows directly after the Module constant pool
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outputModuleInfoBlock(M);
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// Do the whole module now! Process each method at a time...
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for_each(M->begin(), M->end(),
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bind_obj(this, &BytecodeWriter::processMethod));
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// If needed, output the symbol table for the module...
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if (M->hasSymbolTable())
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outputSymbolTable(*M->getSymbolTable());
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}
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// TODO: REMOVE
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#include "llvm/Assembly/Writer.h"
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void BytecodeWriter::outputConstants(bool isMethod) {
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BytecodeBlock CPool(BytecodeFormat::ConstantPool, Out);
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unsigned NumPlanes = Table.getNumPlanes();
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for (unsigned pno = 0; pno < NumPlanes; pno++) {
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const vector<const Value*> &Plane = Table.getPlane(pno);
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if (Plane.empty()) continue; // Skip empty type planes...
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unsigned ValNo = 0;
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if (isMethod) // Don't reemit module constants
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ValNo = Table.getModuleLevel(pno);
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else if (pno == Type::TypeTyID)
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ValNo = Type::FirstDerivedTyID; // Start emitting at the derived types...
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// Scan through and ignore method arguments...
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for (; ValNo < Plane.size() && Plane[ValNo]->isMethodArgument(); ValNo++)
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/*empty*/;
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unsigned NC = ValNo; // Number of constants
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for (; NC < Plane.size() &&
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(Plane[NC]->isConstant() || Plane[NC]->isType()); NC++) /*empty*/;
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NC -= ValNo; // Convert from index into count
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if (NC == 0) continue; // Skip empty type planes...
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// Output type header: [num entries][type id number]
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//
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output_vbr(NC, Out);
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// Output the Type ID Number...
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int Slot = Table.getValSlot(Plane.front()->getType());
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assert (Slot != -1 && "Type in constant pool but not in method!!");
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output_vbr((unsigned)Slot, Out);
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//cout << "Emitting " << NC << " constants of type '"
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// << Plane.front()->getType()->getName() << "' = Slot #" << Slot << endl;
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for (unsigned i = ValNo; i < ValNo+NC; ++i) {
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const Value *V = Plane[i];
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if (const ConstPoolVal *CPV = V->castConstant()) {
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//cerr << "Serializing value: <" << V->getType() << ">: "
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// << ((const ConstPoolVal*)V)->getStrValue() << ":"
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// << Out.size() << "\n";
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outputConstant(CPV);
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} else {
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const Type *Ty = V->castTypeAsserting();
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outputType(Ty);
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}
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}
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}
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}
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void BytecodeWriter::outputModuleInfoBlock(const Module *M) {
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BytecodeBlock ModuleInfoBlock(BytecodeFormat::ModuleGlobalInfo, Out);
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// Output the types for the global variables in the module...
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for (Module::const_giterator I = M->gbegin(), End = M->gend(); I != End;++I) {
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const GlobalVariable *GV = *I;
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int Slot = Table.getValSlot(GV->getType());
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assert(Slot != -1 && "Module global vars is broken!");
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// Fields: bit0 = isConstant, bit1 = hasInitializer, bit2+ = slot#
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unsigned oSlot = ((unsigned)Slot << 2) | (GV->hasInitializer() << 1) |
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GV->isConstant();
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output_vbr(oSlot, Out);
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// If we have an initialized, output it now.
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if (GV->hasInitializer()) {
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Slot = Table.getValSlot(GV->getInitializer());
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assert(Slot != -1 && "No slot for global var initializer!");
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output_vbr((unsigned)Slot, Out);
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}
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}
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output_vbr((unsigned)Table.getValSlot(Type::VoidTy), Out);
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// Output the types of the methods in this module...
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for (Module::const_iterator I = M->begin(), End = M->end(); I != End; ++I) {
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int Slot = Table.getValSlot((*I)->getType());
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assert(Slot != -1 && "Module const pool is broken!");
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assert(Slot >= Type::FirstDerivedTyID && "Derived type not in range!");
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output_vbr((unsigned)Slot, Out);
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}
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output_vbr((unsigned)Table.getValSlot(Type::VoidTy), Out);
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align32(Out);
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}
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void BytecodeWriter::processMethod(const Method *M) {
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BytecodeBlock MethodBlock(BytecodeFormat::Method, Out);
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// Only output the constant pool and other goodies if needed...
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if (!M->isExternal()) {
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// Get slot information about the method...
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Table.incorporateMethod(M);
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// Output information about the constants in the method...
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outputConstants(true);
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// Output basic block nodes...
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for_each(M->begin(), M->end(),
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bind_obj(this, &BytecodeWriter::processBasicBlock));
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// If needed, output the symbol table for the method...
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if (M->hasSymbolTable())
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outputSymbolTable(*M->getSymbolTable());
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Table.purgeMethod();
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}
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}
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void BytecodeWriter::processBasicBlock(const BasicBlock *BB) {
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BytecodeBlock MethodBlock(BytecodeFormat::BasicBlock, Out);
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// Process all the instructions in the bb...
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for_each(BB->begin(), BB->end(),
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bind_obj(this, &BytecodeWriter::processInstruction));
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}
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void BytecodeWriter::outputSymbolTable(const SymbolTable &MST) {
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BytecodeBlock MethodBlock(BytecodeFormat::SymbolTable, Out);
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for (SymbolTable::const_iterator TI = MST.begin(); TI != MST.end(); ++TI) {
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SymbolTable::type_const_iterator I = MST.type_begin(TI->first);
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SymbolTable::type_const_iterator End = MST.type_end(TI->first);
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int Slot;
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if (I == End) continue; // Don't mess with an absent type...
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// Symtab block header: [num entries][type id number]
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output_vbr(MST.type_size(TI->first), Out);
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Slot = Table.getValSlot(TI->first);
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assert(Slot != -1 && "Type in symtab, but not in table!");
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output_vbr((unsigned)Slot, Out);
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for (; I != End; ++I) {
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// Symtab entry: [def slot #][name]
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Slot = Table.getValSlot(I->second);
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assert(Slot != -1 && "Value in symtab but has no slot number!!");
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output_vbr((unsigned)Slot, Out);
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output(I->first, Out, false); // Don't force alignment...
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}
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}
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}
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void WriteBytecodeToFile(const Module *C, ostream &Out) {
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assert(C && "You can't write a null module!!");
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deque<unsigned char> Buffer;
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// This object populates buffer for us...
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BytecodeWriter BCW(Buffer, C);
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// Okay, write the deque out to the ostream now... the deque is not
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// sequential in memory, however, so write out as much as possible in big
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// chunks, until we're done.
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//
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deque<unsigned char>::const_iterator I = Buffer.begin(), E = Buffer.end();
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while (I != E) { // Loop until it's all written
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// Scan to see how big this chunk is...
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const unsigned char *ChunkPtr = &*I;
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const unsigned char *LastPtr = ChunkPtr;
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while (I != E) {
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const unsigned char *ThisPtr = &*++I;
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if (LastPtr+1 != ThisPtr) break;// Advanced by more than a byte of memory?
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LastPtr = ThisPtr;
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}
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// Write out the chunk...
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Out.write(ChunkPtr, LastPtr-ChunkPtr+(I != E));
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}
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Out.flush();
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}
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