mirror of
https://github.com/c64scene-ar/llvm-6502.git
synced 2025-10-31 08:16:47 +00:00
8cdc6b726a
reading bytecode files with > 255 types in them, but only when optimization
is enabled. This was caused by GCC shrinking an enum to a single byte
instead of a whole word.
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@4266 91177308-0d34-0410-b5e6-96231b3b80d8
666 lines
21 KiB
C++
666 lines
21 KiB
C++
//===- Reader.cpp - Code to read bytecode files ---------------------------===//
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//
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// This library implements the functionality defined in llvm/Bytecode/Reader.h
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//
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// Note that this library should be as fast as possible, reentrant, and
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// threadsafe!!
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//
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// TODO: Return error messages to caller instead of printing them out directly.
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// TODO: Allow passing in an option to ignore the symbol table
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//
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//===----------------------------------------------------------------------===//
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#include "ReaderInternals.h"
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#include "llvm/Bytecode/Reader.h"
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#include "llvm/Bytecode/Format.h"
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#include "llvm/Module.h"
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#include "llvm/Constants.h"
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#include "llvm/iPHINode.h"
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#include "llvm/iOther.h"
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#include <sys/types.h>
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#include <sys/stat.h>
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#include <sys/mman.h>
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#include <fcntl.h>
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#include <unistd.h>
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#include <algorithm>
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using std::cerr;
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using std::pair;
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using std::make_pair;
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bool BytecodeParser::getTypeSlot(const Type *Ty, unsigned &Slot) {
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if (Ty->isPrimitiveType()) {
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Slot = Ty->getPrimitiveID();
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} else {
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// Check the method level types first...
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TypeValuesListTy::iterator I = find(MethodTypeValues.begin(),
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MethodTypeValues.end(), Ty);
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if (I != MethodTypeValues.end()) {
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Slot = FirstDerivedTyID+ModuleTypeValues.size()+
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(&*I - &MethodTypeValues[0]);
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} else {
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I = find(ModuleTypeValues.begin(), ModuleTypeValues.end(), Ty);
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if (I == ModuleTypeValues.end()) return true; // Didn't find type!
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Slot = FirstDerivedTyID + (&*I - &ModuleTypeValues[0]);
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}
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}
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//cerr << "getTypeSlot '" << Ty->getName() << "' = " << Slot << "\n";
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return false;
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}
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const Type *BytecodeParser::getType(unsigned ID) {
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if (ID < Type::NumPrimitiveIDs) {
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const Type *T = Type::getPrimitiveType((Type::PrimitiveID)ID);
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if (T) return T;
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}
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//cerr << "Looking up Type ID: " << ID << "\n";
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const Value *V = getValue(Type::TypeTy, ID, false);
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return cast_or_null<Type>(V);
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}
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int BytecodeParser::insertValue(Value *Val, std::vector<ValueList> &ValueTab) {
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unsigned type;
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if (getTypeSlot(Val->getType(), type)) return -1;
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assert(type != Type::TypeTyID && "Types should never be insertValue'd!");
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if (ValueTab.size() <= type)
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ValueTab.resize(type+1, ValueList());
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//cerr << "insertValue Values[" << type << "][" << ValueTab[type].size()
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// << "] = " << Val << "\n";
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ValueTab[type].push_back(Val);
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return ValueTab[type].size()-1;
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}
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Value *BytecodeParser::getValue(const Type *Ty, unsigned oNum, bool Create) {
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unsigned Num = oNum;
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unsigned type; // The type plane it lives in...
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if (getTypeSlot(Ty, type)) return 0;
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if (type == Type::TypeTyID) { // The 'type' plane has implicit values
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assert(Create == false);
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if (Num < Type::NumPrimitiveIDs) {
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const Type *T = Type::getPrimitiveType((Type::PrimitiveID)Num);
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if (T) return (Value*)T; // Asked for a primitive type...
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}
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// Otherwise, derived types need offset...
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Num -= FirstDerivedTyID;
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// Is it a module level type?
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if (Num < ModuleTypeValues.size())
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return (Value*)ModuleTypeValues[Num].get();
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// Nope, is it a method level type?
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Num -= ModuleTypeValues.size();
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if (Num < MethodTypeValues.size())
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return (Value*)MethodTypeValues[Num].get();
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return 0;
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}
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if (type < ModuleValues.size()) {
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if (Num < ModuleValues[type].size())
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return ModuleValues[type][Num];
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Num -= ModuleValues[type].size();
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}
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if (Values.size() > type && Values[type].size() > Num)
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return Values[type][Num];
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if (!Create) return 0; // Do not create a placeholder?
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Value *d = 0;
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switch (Ty->getPrimitiveID()) {
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case Type::FunctionTyID:
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cerr << "Creating method pholder! : " << type << ":" << oNum << " "
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<< Ty->getName() << "\n";
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d = new FunctionPHolder(Ty, oNum);
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if (insertValue(d, LateResolveModuleValues) == -1) return 0;
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return d;
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case Type::LabelTyID:
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d = new BBPHolder(Ty, oNum);
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break;
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default:
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d = new ValPHolder(Ty, oNum);
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break;
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}
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assert(d != 0 && "How did we not make something?");
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if (insertValue(d, LateResolveValues) == -1) return 0;
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return d;
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}
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/// getConstantValue - Just like getValue, except that it returns a null pointer
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/// only on error. It always returns a constant (meaning that if the value is
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/// defined, but is not a constant, that is an error). If the specified
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/// constant hasn't been parsed yet, a placeholder is defined and used. Later,
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/// after the real value is parsed, the placeholder is eliminated.
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///
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Constant *BytecodeParser::getConstantValue(const Type *Ty, unsigned Slot) {
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if (Value *V = getValue(Ty, Slot, false))
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return dyn_cast<Constant>(V); // If we already have the value parsed...
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GlobalRefsType::iterator I = GlobalRefs.find(make_pair(Ty, Slot));
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if (I != GlobalRefs.end()) {
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BCR_TRACE(5, "Previous forward ref found!\n");
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return cast<Constant>(I->second);
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} else {
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// Create a placeholder for the constant reference and
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// keep track of the fact that we have a forward ref to recycle it
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BCR_TRACE(5, "Creating new forward ref to a constant!\n");
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Constant *C = new ConstPHolder(Ty, Slot);
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// Keep track of the fact that we have a forward ref to recycle it
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GlobalRefs.insert(make_pair(make_pair(Ty, Slot), C));
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return C;
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}
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}
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bool BytecodeParser::postResolveValues(ValueTable &ValTab) {
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bool Error = false;
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for (unsigned ty = 0; ty < ValTab.size(); ++ty) {
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ValueList &DL = ValTab[ty];
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unsigned Size;
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while ((Size = DL.size())) {
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unsigned IDNumber = getValueIDNumberFromPlaceHolder(DL[Size-1]);
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Value *D = DL[Size-1];
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DL.pop_back();
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Value *NewDef = getValue(D->getType(), IDNumber, false);
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if (NewDef == 0) {
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Error = true; // Unresolved thinger
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cerr << "Unresolvable reference found: <"
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<< D->getType()->getDescription() << ">:" << IDNumber << "!\n";
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} else {
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// Fixup all of the uses of this placeholder def...
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D->replaceAllUsesWith(NewDef);
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// Now that all the uses are gone, delete the placeholder...
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// If we couldn't find a def (error case), then leak a little
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delete D; // memory, 'cause otherwise we can't remove all uses!
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}
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}
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}
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return Error;
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}
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bool BytecodeParser::ParseBasicBlock(const uchar *&Buf, const uchar *EndBuf,
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BasicBlock *&BB) {
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BB = new BasicBlock();
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while (Buf < EndBuf) {
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Instruction *Inst;
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if (ParseInstruction(Buf, EndBuf, Inst,
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/*HACK*/BB)) {
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delete BB;
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return true;
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}
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if (Inst == 0) { delete BB; return true; }
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if (insertValue(Inst, Values) == -1) { delete BB; return true; }
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BB->getInstList().push_back(Inst);
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BCR_TRACE(4, Inst);
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}
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return false;
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}
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bool BytecodeParser::ParseSymbolTable(const uchar *&Buf, const uchar *EndBuf,
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SymbolTable *ST) {
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while (Buf < EndBuf) {
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// Symtab block header: [num entries][type id number]
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unsigned NumEntries, Typ;
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if (read_vbr(Buf, EndBuf, NumEntries) ||
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read_vbr(Buf, EndBuf, Typ)) return true;
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const Type *Ty = getType(Typ);
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if (Ty == 0) return true;
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BCR_TRACE(3, "Plane Type: '" << Ty << "' with " << NumEntries <<
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" entries\n");
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for (unsigned i = 0; i < NumEntries; ++i) {
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// Symtab entry: [def slot #][name]
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unsigned slot;
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if (read_vbr(Buf, EndBuf, slot)) return true;
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std::string Name;
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if (read(Buf, EndBuf, Name, false)) // Not aligned...
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return true;
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Value *D = getValue(Ty, slot, false); // Find mapping...
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if (D == 0) {
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BCR_TRACE(3, "FAILED LOOKUP: Slot #" << slot << "\n");
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return true;
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}
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BCR_TRACE(4, "Map: '" << Name << "' to #" << slot << ":" << D;
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if (!isa<Instruction>(D)) cerr << "\n");
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D->setName(Name, ST);
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}
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}
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if (Buf > EndBuf) return true;
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return false;
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}
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void BytecodeParser::ResolveReferencesToValue(Value *NewV, unsigned Slot) {
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GlobalRefsType::iterator I = GlobalRefs.find(make_pair(NewV->getType(),Slot));
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if (I == GlobalRefs.end()) return; // Never forward referenced?
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BCR_TRACE(3, "Mutating forward refs!\n");
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Value *VPH = I->second; // Get the placeholder...
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// Loop over all of the uses of the Value. What they are depends
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// on what NewV is. Replacing a use of the old reference takes the
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// use off the use list, so loop with !use_empty(), not the use_iterator.
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while (!VPH->use_empty()) {
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Constant *C = cast<Constant>(VPH->use_back());
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unsigned numReplaced = C->mutateReferences(VPH, NewV);
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assert(numReplaced > 0 && "Supposed user wasn't really a user?");
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if (GlobalValue* GVal = dyn_cast<GlobalValue>(NewV)) {
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// Remove the placeholder GlobalValue from the module...
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GVal->getParent()->getGlobalList().remove(cast<GlobalVariable>(VPH));
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}
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}
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delete VPH; // Delete the old placeholder
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GlobalRefs.erase(I); // Remove the map entry for it
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}
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bool BytecodeParser::ParseMethod(const uchar *&Buf, const uchar *EndBuf,
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Module *C) {
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// Clear out the local values table...
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Values.clear();
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if (FunctionSignatureList.empty()) {
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Error = "Function found, but FunctionSignatureList empty!";
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return true; // Unexpected method!
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}
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const PointerType *PMTy = FunctionSignatureList.back().first; // PtrMeth
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const FunctionType *MTy = dyn_cast<FunctionType>(PMTy->getElementType());
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if (MTy == 0) return true; // Not ptr to method!
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unsigned isInternal;
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if (read_vbr(Buf, EndBuf, isInternal)) return true;
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unsigned MethSlot = FunctionSignatureList.back().second;
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FunctionSignatureList.pop_back();
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Function *M = new Function(MTy, isInternal != 0);
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BCR_TRACE(2, "METHOD TYPE: " << MTy << "\n");
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const FunctionType::ParamTypes &Params = MTy->getParamTypes();
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Function::aiterator AI = M->abegin();
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for (FunctionType::ParamTypes::const_iterator It = Params.begin();
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It != Params.end(); ++It, ++AI) {
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if (insertValue(AI, Values) == -1) {
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Error = "Error reading method arguments!\n";
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delete M; return true;
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}
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}
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while (Buf < EndBuf) {
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unsigned Type, Size;
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const uchar *OldBuf = Buf;
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if (readBlock(Buf, EndBuf, Type, Size)) {
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Error = "Error reading Function level block!";
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delete M; return true;
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}
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switch (Type) {
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case BytecodeFormat::ConstantPool:
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BCR_TRACE(2, "BLOCK BytecodeFormat::ConstantPool: {\n");
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if (ParseConstantPool(Buf, Buf+Size, Values, MethodTypeValues)) {
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delete M; return true;
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}
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break;
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case BytecodeFormat::BasicBlock: {
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BCR_TRACE(2, "BLOCK BytecodeFormat::BasicBlock: {\n");
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BasicBlock *BB;
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if (ParseBasicBlock(Buf, Buf+Size, BB) ||
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insertValue(BB, Values) == -1) {
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delete M; return true; // Parse error... :(
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}
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M->getBasicBlockList().push_back(BB);
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break;
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}
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case BytecodeFormat::SymbolTable:
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BCR_TRACE(2, "BLOCK BytecodeFormat::SymbolTable: {\n");
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if (ParseSymbolTable(Buf, Buf+Size, M->getSymbolTableSure())) {
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delete M; return true;
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}
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break;
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default:
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BCR_TRACE(2, "BLOCK <unknown>:ignored! {\n");
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Buf += Size;
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if (OldBuf > Buf) return true; // Wrap around!
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break;
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}
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BCR_TRACE(2, "} end block\n");
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if (align32(Buf, EndBuf)) {
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Error = "Error aligning Function level block!";
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delete M; // Malformed bc file, read past end of block.
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return true;
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}
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}
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if (postResolveValues(LateResolveValues) ||
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postResolveValues(LateResolveModuleValues)) {
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Error = "Error resolving method values!";
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delete M; return true; // Unresolvable references!
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}
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Value *FunctionPHolder = getValue(PMTy, MethSlot, false);
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assert(FunctionPHolder && "Something is broken no placeholder found!");
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assert(isa<Function>(FunctionPHolder) && "Not a function?");
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unsigned type; // Type slot
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assert(!getTypeSlot(MTy, type) && "How can meth type not exist?");
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getTypeSlot(PMTy, type);
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C->getFunctionList().push_back(M);
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// Replace placeholder with the real method pointer...
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ModuleValues[type][MethSlot] = M;
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// Clear out method level types...
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MethodTypeValues.clear();
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// If anyone is using the placeholder make them use the real method instead
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FunctionPHolder->replaceAllUsesWith(M);
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// We don't need the placeholder anymore!
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delete FunctionPHolder;
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ResolveReferencesToValue(M, MethSlot);
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return false;
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}
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bool BytecodeParser::ParseModuleGlobalInfo(const uchar *&Buf, const uchar *End,
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Module *Mod) {
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if (!FunctionSignatureList.empty()) {
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Error = "Two ModuleGlobalInfo packets found!";
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return true; // Two ModuleGlobal blocks?
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}
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// Read global variables...
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unsigned VarType;
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if (read_vbr(Buf, End, VarType)) return true;
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while (VarType != Type::VoidTyID) { // List is terminated by Void
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// VarType Fields: bit0 = isConstant, bit1 = hasInitializer,
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// bit2 = isInternal, bit3+ = slot#
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const Type *Ty = getType(VarType >> 3);
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if (!Ty || !isa<PointerType>(Ty)) {
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Error = "Global not pointer type! Ty = " + Ty->getDescription();
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return true;
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}
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const PointerType *PTy = cast<const PointerType>(Ty);
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const Type *ElTy = PTy->getElementType();
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Constant *Initializer = 0;
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if (VarType & 2) { // Does it have an initalizer?
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// Do not improvise... values must have been stored in the constant pool,
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// which should have been read before now.
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//
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unsigned InitSlot;
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if (read_vbr(Buf, End, InitSlot)) return true;
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Value *V = getValue(ElTy, InitSlot, false);
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if (V == 0) return true;
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Initializer = cast<Constant>(V);
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}
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// Create the global variable...
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GlobalVariable *GV = new GlobalVariable(ElTy, VarType & 1, VarType & 4,
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Initializer);
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int DestSlot = insertValue(GV, ModuleValues);
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if (DestSlot == -1) return true;
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Mod->getGlobalList().push_back(GV);
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ResolveReferencesToValue(GV, (unsigned)DestSlot);
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BCR_TRACE(2, "Global Variable of type: " << PTy->getDescription()
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<< " into slot #" << DestSlot << "\n");
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if (read_vbr(Buf, End, VarType)) return true;
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}
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// Read the method signatures for all of the methods that are coming, and
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// create fillers in the Value tables.
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unsigned FnSignature;
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if (read_vbr(Buf, End, FnSignature)) return true;
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while (FnSignature != Type::VoidTyID) { // List is terminated by Void
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const Type *Ty = getType(FnSignature);
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if (!Ty || !isa<PointerType>(Ty) ||
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!isa<FunctionType>(cast<PointerType>(Ty)->getElementType())) {
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Error = "Function not ptr to func type! Ty = " + Ty->getDescription();
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return true;
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}
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// We create methods by passing the underlying FunctionType to create...
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Ty = cast<PointerType>(Ty)->getElementType();
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// When the ModuleGlobalInfo section is read, we load the type of each
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// method and the 'ModuleValues' slot that it lands in. We then load a
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// placeholder into its slot to reserve it. When the method is loaded, this
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// placeholder is replaced.
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// Insert the placeholder...
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Value *Val = new FunctionPHolder(Ty, 0);
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if (insertValue(Val, ModuleValues) == -1) return true;
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// Figure out which entry of its typeslot it went into...
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unsigned TypeSlot;
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if (getTypeSlot(Val->getType(), TypeSlot)) return true;
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unsigned SlotNo = ModuleValues[TypeSlot].size()-1;
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// Keep track of this information in a linked list that is emptied as
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// methods are loaded...
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//
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FunctionSignatureList.push_back(
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make_pair(cast<const PointerType>(Val->getType()), SlotNo));
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if (read_vbr(Buf, End, FnSignature)) return true;
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BCR_TRACE(2, "Function of type: " << Ty << "\n");
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}
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if (align32(Buf, End)) return true;
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// Now that the function signature list is set up, reverse it so that we can
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// remove elements efficiently from the back of the vector.
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std::reverse(FunctionSignatureList.begin(), FunctionSignatureList.end());
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// This is for future proofing... in the future extra fields may be added that
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// we don't understand, so we transparently ignore them.
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//
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Buf = End;
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return false;
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}
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bool BytecodeParser::ParseModule(const uchar *Buf, const uchar *EndBuf,
|
|
Module *&Mod) {
|
|
|
|
unsigned Type, Size;
|
|
if (readBlock(Buf, EndBuf, Type, Size)) return true;
|
|
if (Type != BytecodeFormat::Module || Buf+Size != EndBuf) {
|
|
Error = "Expected Module packet!";
|
|
return true; // Hrm, not a class?
|
|
}
|
|
|
|
BCR_TRACE(0, "BLOCK BytecodeFormat::Module: {\n");
|
|
FunctionSignatureList.clear(); // Just in case...
|
|
|
|
// Read into instance variables...
|
|
if (read_vbr(Buf, EndBuf, FirstDerivedTyID)) return true;
|
|
if (align32(Buf, EndBuf)) return true;
|
|
BCR_TRACE(1, "FirstDerivedTyID = " << FirstDerivedTyID << "\n");
|
|
|
|
TheModule = Mod = new Module();
|
|
|
|
while (Buf < EndBuf) {
|
|
const uchar *OldBuf = Buf;
|
|
if (readBlock(Buf, EndBuf, Type, Size)) { delete Mod; return true;}
|
|
switch (Type) {
|
|
case BytecodeFormat::ConstantPool:
|
|
BCR_TRACE(1, "BLOCK BytecodeFormat::ConstantPool: {\n");
|
|
if (ParseConstantPool(Buf, Buf+Size, ModuleValues, ModuleTypeValues)) {
|
|
delete Mod; return true;
|
|
}
|
|
break;
|
|
|
|
case BytecodeFormat::ModuleGlobalInfo:
|
|
BCR_TRACE(1, "BLOCK BytecodeFormat::ModuleGlobalInfo: {\n");
|
|
|
|
if (ParseModuleGlobalInfo(Buf, Buf+Size, Mod)) {
|
|
delete Mod; return true;
|
|
}
|
|
break;
|
|
|
|
case BytecodeFormat::Function: {
|
|
BCR_TRACE(1, "BLOCK BytecodeFormat::Function: {\n");
|
|
if (ParseMethod(Buf, Buf+Size, Mod)) {
|
|
delete Mod; return true; // Error parsing function
|
|
}
|
|
break;
|
|
}
|
|
|
|
case BytecodeFormat::SymbolTable:
|
|
BCR_TRACE(1, "BLOCK BytecodeFormat::SymbolTable: {\n");
|
|
if (ParseSymbolTable(Buf, Buf+Size, Mod->getSymbolTableSure())) {
|
|
delete Mod; return true;
|
|
}
|
|
break;
|
|
|
|
default:
|
|
Error = "Expected Module Block!";
|
|
Buf += Size;
|
|
if (OldBuf > Buf) return true; // Wrap around!
|
|
break;
|
|
}
|
|
BCR_TRACE(1, "} end block\n");
|
|
if (align32(Buf, EndBuf)) { delete Mod; return true; }
|
|
}
|
|
|
|
if (!FunctionSignatureList.empty()) { // Expected more methods!
|
|
Error = "Function expected, but bytecode stream at end!";
|
|
return true;
|
|
}
|
|
|
|
BCR_TRACE(0, "} end block\n\n");
|
|
return false;
|
|
}
|
|
|
|
Module *BytecodeParser::ParseBytecode(const uchar *Buf, const uchar *EndBuf) {
|
|
LateResolveValues.clear();
|
|
unsigned Sig;
|
|
// Read and check signature...
|
|
if (read(Buf, EndBuf, Sig) ||
|
|
Sig != ('l' | ('l' << 8) | ('v' << 16) | 'm' << 24)) {
|
|
Error = "Invalid bytecode signature!";
|
|
return 0; // Invalid signature!
|
|
}
|
|
|
|
Module *Result;
|
|
if (ParseModule(Buf, EndBuf, Result)) return 0;
|
|
return Result;
|
|
}
|
|
|
|
|
|
Module *ParseBytecodeBuffer(const unsigned char *Buffer, unsigned Length) {
|
|
BytecodeParser Parser;
|
|
return Parser.ParseBytecode(Buffer, Buffer+Length);
|
|
}
|
|
|
|
// Parse and return a class file...
|
|
//
|
|
Module *ParseBytecodeFile(const std::string &Filename, std::string *ErrorStr) {
|
|
struct stat StatBuf;
|
|
Module *Result = 0;
|
|
|
|
if (Filename != std::string("-")) { // Read from a file...
|
|
int FD = open(Filename.c_str(), O_RDONLY);
|
|
if (FD == -1) {
|
|
if (ErrorStr) *ErrorStr = "Error opening file!";
|
|
return 0;
|
|
}
|
|
|
|
if (fstat(FD, &StatBuf) == -1) { close(FD); return 0; }
|
|
|
|
int Length = StatBuf.st_size;
|
|
if (Length == 0) {
|
|
if (ErrorStr) *ErrorStr = "Error stat'ing file!";
|
|
close(FD); return 0;
|
|
}
|
|
uchar *Buffer = (uchar*)mmap(0, Length, PROT_READ,
|
|
MAP_PRIVATE, FD, 0);
|
|
if (Buffer == (uchar*)-1) {
|
|
if (ErrorStr) *ErrorStr = "Error mmapping file!";
|
|
close(FD); return 0;
|
|
}
|
|
|
|
BytecodeParser Parser;
|
|
Result = Parser.ParseBytecode(Buffer, Buffer+Length);
|
|
|
|
munmap((char*)Buffer, Length);
|
|
close(FD);
|
|
if (ErrorStr) *ErrorStr = Parser.getError();
|
|
} else { // Read from stdin
|
|
size_t FileSize = 0;
|
|
int BlockSize;
|
|
uchar Buffer[4096], *FileData = 0;
|
|
while ((BlockSize = read(0, Buffer, 4096))) {
|
|
if (BlockSize == -1) { free(FileData); return 0; }
|
|
|
|
FileData = (uchar*)realloc(FileData, FileSize+BlockSize);
|
|
memcpy(FileData+FileSize, Buffer, BlockSize);
|
|
FileSize += BlockSize;
|
|
}
|
|
|
|
if (FileSize == 0) {
|
|
if (ErrorStr) *ErrorStr = "Standard Input empty!";
|
|
free(FileData); return 0;
|
|
}
|
|
|
|
#define ALIGN_PTRS 0
|
|
#if ALIGN_PTRS
|
|
uchar *Buf = (uchar*)mmap(0, FileSize, PROT_READ|PROT_WRITE,
|
|
MAP_PRIVATE|MAP_ANONYMOUS, -1, 0);
|
|
assert((Buf != (uchar*)-1) && "mmap returned error!");
|
|
memcpy(Buf, FileData, FileSize);
|
|
free(FileData);
|
|
#else
|
|
uchar *Buf = FileData;
|
|
#endif
|
|
|
|
BytecodeParser Parser;
|
|
Result = Parser.ParseBytecode(Buf, Buf+FileSize);
|
|
|
|
#if ALIGN_PTRS
|
|
munmap((char*)Buf, FileSize); // Free mmap'd data area
|
|
#else
|
|
free(FileData); // Free realloc'd block of memory
|
|
#endif
|
|
|
|
if (ErrorStr) *ErrorStr = Parser.getError();
|
|
}
|
|
|
|
return Result;
|
|
}
|