mirror of
https://github.com/c64scene-ar/llvm-6502.git
synced 2024-12-23 15:29:51 +00:00
0b16ae209a
reflect the fact that it's a range being defined. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@4147 91177308-0d34-0410-b5e6-96231b3b80d8
472 lines
15 KiB
C++
472 lines
15 KiB
C++
//===- ReadInst.cpp - Code to read an instruction from bytecode -----------===//
|
|
//
|
|
// This file defines the mechanism to read an instruction from a bytecode
|
|
// stream.
|
|
//
|
|
// Note that this library should be as fast as possible, reentrant, and
|
|
// threadsafe!!
|
|
//
|
|
// TODO: Change from getValue(Raw.Arg1) etc, to getArg(Raw, 1)
|
|
// Make it check type, so that casts are checked.
|
|
//
|
|
//===----------------------------------------------------------------------===//
|
|
|
|
#include "ReaderInternals.h"
|
|
#include "llvm/iTerminators.h"
|
|
#include "llvm/iMemory.h"
|
|
#include "llvm/iPHINode.h"
|
|
#include "llvm/iOther.h"
|
|
using std::vector;
|
|
using std::cerr;
|
|
|
|
bool BytecodeParser::ParseRawInst(const uchar *&Buf, const uchar *EndBuf,
|
|
RawInst &Result) {
|
|
unsigned Op, Typ;
|
|
if (read(Buf, EndBuf, Op)) return true;
|
|
|
|
// bits Instruction format: Common to all formats
|
|
// --------------------------
|
|
// 01-00: Opcode type, fixed to 1.
|
|
// 07-02: Opcode
|
|
Result.NumOperands = (Op >> 0) & 03;
|
|
Result.Opcode = (Op >> 2) & 63;
|
|
|
|
switch (Result.NumOperands) {
|
|
case 1:
|
|
// bits Instruction format:
|
|
// --------------------------
|
|
// 19-08: Resulting type plane
|
|
// 31-20: Operand #1 (if set to (2^12-1), then zero operands)
|
|
//
|
|
Result.Ty = getType((Op >> 8) & 4095);
|
|
Result.Arg1 = (Op >> 20) & 4095;
|
|
if (Result.Arg1 == 4095) // Handle special encoding for 0 operands...
|
|
Result.NumOperands = 0;
|
|
break;
|
|
case 2:
|
|
// bits Instruction format:
|
|
// --------------------------
|
|
// 15-08: Resulting type plane
|
|
// 23-16: Operand #1
|
|
// 31-24: Operand #2
|
|
//
|
|
Result.Ty = getType((Op >> 8) & 255);
|
|
Result.Arg1 = (Op >> 16) & 255;
|
|
Result.Arg2 = (Op >> 24) & 255;
|
|
break;
|
|
case 3:
|
|
// bits Instruction format:
|
|
// --------------------------
|
|
// 13-08: Resulting type plane
|
|
// 19-14: Operand #1
|
|
// 25-20: Operand #2
|
|
// 31-26: Operand #3
|
|
//
|
|
Result.Ty = getType((Op >> 8) & 63);
|
|
Result.Arg1 = (Op >> 14) & 63;
|
|
Result.Arg2 = (Op >> 20) & 63;
|
|
Result.Arg3 = (Op >> 26) & 63;
|
|
break;
|
|
case 0:
|
|
Buf -= 4; // Hrm, try this again...
|
|
if (read_vbr(Buf, EndBuf, Result.Opcode)) return true;
|
|
Result.Opcode >>= 2;
|
|
if (read_vbr(Buf, EndBuf, Typ)) return true;
|
|
Result.Ty = getType(Typ);
|
|
if (Result.Ty == 0) return true;
|
|
if (read_vbr(Buf, EndBuf, Result.NumOperands)) return true;
|
|
|
|
switch (Result.NumOperands) {
|
|
case 0:
|
|
cerr << "Zero Arg instr found!\n";
|
|
return true; // This encoding is invalid!
|
|
case 1:
|
|
if (read_vbr(Buf, EndBuf, Result.Arg1)) return true;
|
|
break;
|
|
case 2:
|
|
if (read_vbr(Buf, EndBuf, Result.Arg1) ||
|
|
read_vbr(Buf, EndBuf, Result.Arg2)) return true;
|
|
break;
|
|
case 3:
|
|
if (read_vbr(Buf, EndBuf, Result.Arg1) ||
|
|
read_vbr(Buf, EndBuf, Result.Arg2) ||
|
|
read_vbr(Buf, EndBuf, Result.Arg3)) return true;
|
|
break;
|
|
default:
|
|
if (read_vbr(Buf, EndBuf, Result.Arg1) ||
|
|
read_vbr(Buf, EndBuf, Result.Arg2)) return true;
|
|
|
|
// Allocate a vector to hold arguments 3, 4, 5, 6 ...
|
|
Result.VarArgs = new vector<unsigned>(Result.NumOperands-2);
|
|
for (unsigned a = 0; a < Result.NumOperands-2; a++)
|
|
if (read_vbr(Buf, EndBuf, (*Result.VarArgs)[a])) return true;
|
|
break;
|
|
}
|
|
if (align32(Buf, EndBuf)) return true;
|
|
break;
|
|
}
|
|
|
|
#if 0
|
|
cerr << "NO: " << Result.NumOperands << " opcode: " << Result.Opcode
|
|
<< " Ty: " << Result.Ty->getDescription() << " arg1: " << Result.Arg1
|
|
<< " arg2: " << Result.Arg2 << " arg3: " << Result.Arg3 << "\n";
|
|
#endif
|
|
return false;
|
|
}
|
|
|
|
|
|
bool BytecodeParser::ParseInstruction(const uchar *&Buf, const uchar *EndBuf,
|
|
Instruction *&Res,
|
|
BasicBlock *BB /*HACK*/) {
|
|
RawInst Raw;
|
|
if (ParseRawInst(Buf, EndBuf, Raw))
|
|
return true;
|
|
|
|
if (Raw.Opcode >= Instruction::BinaryOpsBegin &&
|
|
Raw.Opcode < Instruction::BinaryOpsEnd && Raw.NumOperands == 2) {
|
|
Res = BinaryOperator::create((Instruction::BinaryOps)Raw.Opcode,
|
|
getValue(Raw.Ty, Raw.Arg1),
|
|
getValue(Raw.Ty, Raw.Arg2));
|
|
return false;
|
|
}
|
|
|
|
Value *V;
|
|
switch (Raw.Opcode) {
|
|
case Instruction::Cast: {
|
|
V = getValue(Raw.Ty, Raw.Arg1);
|
|
const Type *Ty = getType(Raw.Arg2);
|
|
if (V == 0 || Ty == 0) { cerr << "Invalid cast!\n"; return true; }
|
|
Res = new CastInst(V, Ty);
|
|
return false;
|
|
}
|
|
case Instruction::PHINode: {
|
|
PHINode *PN = new PHINode(Raw.Ty);
|
|
switch (Raw.NumOperands) {
|
|
case 0:
|
|
case 1:
|
|
case 3: cerr << "Invalid phi node encountered!\n";
|
|
delete PN;
|
|
return true;
|
|
case 2: PN->addIncoming(getValue(Raw.Ty, Raw.Arg1),
|
|
cast<BasicBlock>(getValue(Type::LabelTy,Raw.Arg2)));
|
|
break;
|
|
default:
|
|
PN->addIncoming(getValue(Raw.Ty, Raw.Arg1),
|
|
cast<BasicBlock>(getValue(Type::LabelTy, Raw.Arg2)));
|
|
if (Raw.VarArgs->size() & 1) {
|
|
cerr << "PHI Node with ODD number of arguments!\n";
|
|
delete PN;
|
|
return true;
|
|
} else {
|
|
vector<unsigned> &args = *Raw.VarArgs;
|
|
for (unsigned i = 0; i < args.size(); i+=2)
|
|
PN->addIncoming(getValue(Raw.Ty, args[i]),
|
|
cast<BasicBlock>(getValue(Type::LabelTy, args[i+1])));
|
|
}
|
|
delete Raw.VarArgs;
|
|
break;
|
|
}
|
|
Res = PN;
|
|
return false;
|
|
}
|
|
|
|
case Instruction::Shl:
|
|
case Instruction::Shr:
|
|
Res = new ShiftInst((Instruction::OtherOps)Raw.Opcode,
|
|
getValue(Raw.Ty, Raw.Arg1),
|
|
getValue(Type::UByteTy, Raw.Arg2));
|
|
return false;
|
|
case Instruction::Ret:
|
|
if (Raw.NumOperands == 0) {
|
|
Res = new ReturnInst(); return false;
|
|
} else if (Raw.NumOperands == 1) {
|
|
Res = new ReturnInst(getValue(Raw.Ty, Raw.Arg1)); return false;
|
|
}
|
|
break;
|
|
|
|
case Instruction::Br:
|
|
if (Raw.NumOperands == 1) {
|
|
Res = new BranchInst(cast<BasicBlock>(getValue(Type::LabelTy, Raw.Arg1)));
|
|
return false;
|
|
} else if (Raw.NumOperands == 3) {
|
|
Res = new BranchInst(cast<BasicBlock>(getValue(Type::LabelTy, Raw.Arg1)),
|
|
cast<BasicBlock>(getValue(Type::LabelTy, Raw.Arg2)),
|
|
getValue(Type::BoolTy , Raw.Arg3));
|
|
return false;
|
|
}
|
|
break;
|
|
|
|
case Instruction::Switch: {
|
|
SwitchInst *I =
|
|
new SwitchInst(getValue(Raw.Ty, Raw.Arg1),
|
|
cast<BasicBlock>(getValue(Type::LabelTy, Raw.Arg2)));
|
|
Res = I;
|
|
if (Raw.NumOperands < 3) return false; // No destinations? Wierd.
|
|
|
|
if (Raw.NumOperands == 3 || Raw.VarArgs->size() & 1) {
|
|
cerr << "Switch statement with odd number of arguments!\n";
|
|
delete I;
|
|
return true;
|
|
}
|
|
|
|
vector<unsigned> &args = *Raw.VarArgs;
|
|
for (unsigned i = 0; i < args.size(); i += 2)
|
|
I->dest_push_back(cast<Constant>(getValue(Raw.Ty, args[i])),
|
|
cast<BasicBlock>(getValue(Type::LabelTy, args[i+1])));
|
|
|
|
delete Raw.VarArgs;
|
|
return false;
|
|
}
|
|
|
|
case Instruction::Call: {
|
|
Value *M = getValue(Raw.Ty, Raw.Arg1);
|
|
if (M == 0) return true;
|
|
|
|
// Check to make sure we have a pointer to method type
|
|
const PointerType *PTy = dyn_cast<PointerType>(M->getType());
|
|
if (PTy == 0) return true;
|
|
const FunctionType *MTy = dyn_cast<FunctionType>(PTy->getElementType());
|
|
if (MTy == 0) return true;
|
|
|
|
vector<Value *> Params;
|
|
const FunctionType::ParamTypes &PL = MTy->getParamTypes();
|
|
|
|
if (!MTy->isVarArg()) {
|
|
FunctionType::ParamTypes::const_iterator It = PL.begin();
|
|
|
|
switch (Raw.NumOperands) {
|
|
case 0: cerr << "Invalid call instruction encountered!\n";
|
|
return true;
|
|
case 1: break;
|
|
case 2: Params.push_back(getValue(*It++, Raw.Arg2)); break;
|
|
case 3: Params.push_back(getValue(*It++, Raw.Arg2));
|
|
if (It == PL.end()) return true;
|
|
Params.push_back(getValue(*It++, Raw.Arg3)); break;
|
|
default:
|
|
Params.push_back(getValue(*It++, Raw.Arg2));
|
|
{
|
|
vector<unsigned> &args = *Raw.VarArgs;
|
|
for (unsigned i = 0; i < args.size(); i++) {
|
|
if (It == PL.end()) return true;
|
|
// TODO: Check getValue for null!
|
|
Params.push_back(getValue(*It++, args[i]));
|
|
}
|
|
}
|
|
delete Raw.VarArgs;
|
|
}
|
|
if (It != PL.end()) return true;
|
|
} else {
|
|
if (Raw.NumOperands > 2) {
|
|
vector<unsigned> &args = *Raw.VarArgs;
|
|
if (args.size() < 1) return true;
|
|
|
|
if ((args.size() & 1) != 0)
|
|
return true; // Must be pairs of type/value
|
|
for (unsigned i = 0; i < args.size(); i+=2) {
|
|
const Type *Ty = getType(args[i]);
|
|
if (Ty == 0)
|
|
return true;
|
|
|
|
Value *V = getValue(Ty, args[i+1]);
|
|
if (V == 0) return true;
|
|
Params.push_back(V);
|
|
}
|
|
delete Raw.VarArgs;
|
|
}
|
|
}
|
|
|
|
Res = new CallInst(M, Params);
|
|
return false;
|
|
}
|
|
case Instruction::Invoke: {
|
|
Value *M = getValue(Raw.Ty, Raw.Arg1);
|
|
if (M == 0) return true;
|
|
|
|
// Check to make sure we have a pointer to method type
|
|
const PointerType *PTy = dyn_cast<PointerType>(M->getType());
|
|
if (PTy == 0) return true;
|
|
const FunctionType *MTy = dyn_cast<FunctionType>(PTy->getElementType());
|
|
if (MTy == 0) return true;
|
|
|
|
vector<Value *> Params;
|
|
const FunctionType::ParamTypes &PL = MTy->getParamTypes();
|
|
vector<unsigned> &args = *Raw.VarArgs;
|
|
|
|
BasicBlock *Normal, *Except;
|
|
|
|
if (!MTy->isVarArg()) {
|
|
if (Raw.NumOperands < 3) return true;
|
|
|
|
Normal = cast<BasicBlock>(getValue(Type::LabelTy, Raw.Arg2));
|
|
Except = cast<BasicBlock>(getValue(Type::LabelTy, args[0]));
|
|
|
|
FunctionType::ParamTypes::const_iterator It = PL.begin();
|
|
for (unsigned i = 1; i < args.size(); i++) {
|
|
if (It == PL.end()) return true;
|
|
// TODO: Check getValue for null!
|
|
Params.push_back(getValue(*It++, args[i]));
|
|
}
|
|
|
|
if (It != PL.end()) return true;
|
|
} else {
|
|
if (args.size() < 4) return true;
|
|
|
|
Normal = cast<BasicBlock>(getValue(Type::LabelTy, args[0]));
|
|
Except = cast<BasicBlock>(getValue(Type::LabelTy, args[2]));
|
|
|
|
if ((args.size() & 1) != 0)
|
|
return true; // Must be pairs of type/value
|
|
for (unsigned i = 4; i < args.size(); i+=2) {
|
|
// TODO: Check getValue for null!
|
|
Params.push_back(getValue(getType(args[i]), args[i+1]));
|
|
}
|
|
}
|
|
|
|
delete Raw.VarArgs;
|
|
Res = new InvokeInst(M, Normal, Except, Params);
|
|
return false;
|
|
}
|
|
case Instruction::Malloc:
|
|
if (Raw.NumOperands > 2) return true;
|
|
V = Raw.NumOperands ? getValue(Type::UIntTy, Raw.Arg1) : 0;
|
|
if (const PointerType *PTy = dyn_cast<PointerType>(Raw.Ty))
|
|
Res = new MallocInst(PTy->getElementType(), V);
|
|
else
|
|
return true;
|
|
return false;
|
|
|
|
case Instruction::Alloca:
|
|
if (Raw.NumOperands > 2) return true;
|
|
V = Raw.NumOperands ? getValue(Type::UIntTy, Raw.Arg1) : 0;
|
|
if (const PointerType *PTy = dyn_cast<PointerType>(Raw.Ty))
|
|
Res = new AllocaInst(PTy->getElementType(), V);
|
|
else
|
|
return true;
|
|
return false;
|
|
|
|
case Instruction::Free:
|
|
V = getValue(Raw.Ty, Raw.Arg1);
|
|
if (!isa<PointerType>(V->getType())) return true;
|
|
Res = new FreeInst(V);
|
|
return false;
|
|
|
|
case Instruction::Load:
|
|
case Instruction::GetElementPtr: {
|
|
vector<Value*> Idx;
|
|
if (!isa<PointerType>(Raw.Ty)) return true;
|
|
const CompositeType *TopTy = dyn_cast<CompositeType>(Raw.Ty);
|
|
|
|
switch (Raw.NumOperands) {
|
|
case 0: cerr << "Invalid load encountered!\n"; return true;
|
|
case 1: break;
|
|
case 2:
|
|
if (!TopTy) return true;
|
|
Idx.push_back(V = getValue(TopTy->getIndexType(), Raw.Arg2));
|
|
if (!V) return true;
|
|
break;
|
|
case 3: {
|
|
if (!TopTy) return true;
|
|
Idx.push_back(V = getValue(TopTy->getIndexType(), Raw.Arg2));
|
|
if (!V) return true;
|
|
|
|
const Type *ETy = GetElementPtrInst::getIndexedType(TopTy, Idx, true);
|
|
const CompositeType *ElTy = dyn_cast_or_null<CompositeType>(ETy);
|
|
if (!ElTy) return true;
|
|
|
|
Idx.push_back(V = getValue(ElTy->getIndexType(), Raw.Arg3));
|
|
if (!V) return true;
|
|
break;
|
|
}
|
|
default:
|
|
if (!TopTy) return true;
|
|
Idx.push_back(V = getValue(TopTy->getIndexType(), Raw.Arg2));
|
|
if (!V) return true;
|
|
|
|
vector<unsigned> &args = *Raw.VarArgs;
|
|
for (unsigned i = 0, E = args.size(); i != E; ++i) {
|
|
const Type *ETy = GetElementPtrInst::getIndexedType(Raw.Ty, Idx, true);
|
|
const CompositeType *ElTy = dyn_cast_or_null<CompositeType>(ETy);
|
|
if (!ElTy) return true;
|
|
Idx.push_back(V = getValue(ElTy->getIndexType(), args[i]));
|
|
if (!V) return true;
|
|
}
|
|
delete Raw.VarArgs;
|
|
break;
|
|
}
|
|
|
|
if (Raw.Opcode == Instruction::Load) {
|
|
Value *Src = getValue(Raw.Ty, Raw.Arg1);
|
|
if (!Idx.empty()) {
|
|
cerr << "WARNING: Bytecode contains load instruction with indices. "
|
|
<< "Replacing with getelementptr/load pair\n";
|
|
assert(GetElementPtrInst::getIndexedType(Raw.Ty, Idx) &&
|
|
"Bad indices for Load!");
|
|
Src = new GetElementPtrInst(Src, Idx);
|
|
// FIXME: Remove this compatibility code and the BB parameter to this
|
|
// method.
|
|
BB->getInstList().push_back(cast<Instruction>(Src));
|
|
}
|
|
Res = new LoadInst(Src);
|
|
} else if (Raw.Opcode == Instruction::GetElementPtr)
|
|
Res = new GetElementPtrInst(getValue(Raw.Ty, Raw.Arg1), Idx);
|
|
else
|
|
abort();
|
|
return false;
|
|
}
|
|
case Instruction::Store: {
|
|
vector<Value*> Idx;
|
|
if (!isa<PointerType>(Raw.Ty)) return true;
|
|
const CompositeType *TopTy = dyn_cast<CompositeType>(Raw.Ty);
|
|
|
|
switch (Raw.NumOperands) {
|
|
case 0:
|
|
case 1: cerr << "Invalid store encountered!\n"; return true;
|
|
case 2: break;
|
|
case 3:
|
|
if (!TopTy) return true;
|
|
Idx.push_back(V = getValue(TopTy->getIndexType(), Raw.Arg3));
|
|
if (!V) return true;
|
|
break;
|
|
default:
|
|
vector<unsigned> &args = *Raw.VarArgs;
|
|
const CompositeType *ElTy = TopTy;
|
|
unsigned i, E;
|
|
for (i = 0, E = args.size(); ElTy && i != E; ++i) {
|
|
Idx.push_back(V = getValue(ElTy->getIndexType(), args[i]));
|
|
if (!V) return true;
|
|
|
|
const Type *ETy = GetElementPtrInst::getIndexedType(Raw.Ty, Idx, true);
|
|
ElTy = dyn_cast_or_null<CompositeType>(ETy);
|
|
}
|
|
if (i != E)
|
|
return true; // didn't use up all of the indices!
|
|
|
|
delete Raw.VarArgs;
|
|
break;
|
|
}
|
|
|
|
Value *Ptr = getValue(Raw.Ty, Raw.Arg2);
|
|
if (!Idx.empty()) {
|
|
cerr << "WARNING: Bytecode contains load instruction with indices. "
|
|
<< "Replacing with getelementptr/load pair\n";
|
|
|
|
const Type *ElType = GetElementPtrInst::getIndexedType(Raw.Ty, Idx);
|
|
if (ElType == 0) return true;
|
|
|
|
Ptr = new GetElementPtrInst(Ptr, Idx);
|
|
// FIXME: Remove this compatibility code and the BB parameter to this
|
|
// method.
|
|
BB->getInstList().push_back(cast<Instruction>(Ptr));
|
|
}
|
|
|
|
const Type *ValTy = cast<PointerType>(Ptr->getType())->getElementType();
|
|
Res = new StoreInst(getValue(ValTy, Raw.Arg1), Ptr);
|
|
return false;
|
|
}
|
|
} // end switch(Raw.Opcode)
|
|
|
|
cerr << "Unrecognized instruction! " << Raw.Opcode
|
|
<< " ADDR = 0x" << (void*)Buf << "\n";
|
|
return true;
|
|
}
|