mirror of
https://github.com/c64scene-ar/llvm-6502.git
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1d670cc402
* Support globally unique constants * Support recursive and forward referenced types * Support abstract types * Add new BCR_TRACE macro to enable debugging of why the bytecode reader occasionally refuses to read something git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@448 91177308-0d34-0410-b5e6-96231b3b80d8
333 lines
11 KiB
C++
333 lines
11 KiB
C++
//===- ReadInst.cpp - Code to read an instruction from bytecode -------------===
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//
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// This file defines the mechanism to read an instruction from a bytecode
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// stream.
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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: Change from getValue(Raw.Arg1) etc, to getArg(Raw, 1)
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// Make it check type, so that casts are checked.
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//
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//===------------------------------------------------------------------------===
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#include "llvm/iOther.h"
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#include "llvm/iTerminators.h"
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#include "llvm/iMemory.h"
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#include "llvm/DerivedTypes.h"
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#include "ReaderInternals.h"
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bool BytecodeParser::ParseRawInst(const uchar *&Buf, const uchar *EndBuf,
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RawInst &Result) {
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unsigned Op, Typ;
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if (read(Buf, EndBuf, Op)) return failure(true);
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Result.NumOperands = Op >> 30;
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Result.Opcode = (Op >> 24) & 63;
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switch (Result.NumOperands) {
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case 1:
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Result.Ty = getType((Op >> 12) & 4095);
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Result.Arg1 = Op & 4095;
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if (Result.Arg1 == 4095) // Handle special encoding for 0 operands...
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Result.NumOperands = 0;
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break;
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case 2:
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Result.Ty = getType((Op >> 16) & 255);
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Result.Arg1 = (Op >> 8 ) & 255;
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Result.Arg2 = (Op >> 0 ) & 255;
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break;
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case 3:
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Result.Ty = getType((Op >> 18) & 63);
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Result.Arg1 = (Op >> 12) & 63;
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Result.Arg2 = (Op >> 6 ) & 63;
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Result.Arg3 = (Op >> 0 ) & 63;
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break;
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case 0:
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Buf -= 4; // Hrm, try this again...
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if (read_vbr(Buf, EndBuf, Result.Opcode)) return failure(true);
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if (read_vbr(Buf, EndBuf, Typ)) return failure(true);
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Result.Ty = getType(Typ);
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if (read_vbr(Buf, EndBuf, Result.NumOperands)) return failure(true);
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switch (Result.NumOperands) {
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case 0:
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cerr << "Zero Arg instr found!\n";
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return failure(true); // This encoding is invalid!
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case 1:
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if (read_vbr(Buf, EndBuf, Result.Arg1)) return failure(true);
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break;
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case 2:
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if (read_vbr(Buf, EndBuf, Result.Arg1) ||
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read_vbr(Buf, EndBuf, Result.Arg2)) return failure(true);
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break;
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case 3:
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if (read_vbr(Buf, EndBuf, Result.Arg1) ||
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read_vbr(Buf, EndBuf, Result.Arg2) ||
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read_vbr(Buf, EndBuf, Result.Arg3)) return failure(true);
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break;
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default:
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if (read_vbr(Buf, EndBuf, Result.Arg1) ||
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read_vbr(Buf, EndBuf, Result.Arg2)) return failure(true);
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// Allocate a vector to hold arguments 3, 4, 5, 6 ...
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Result.VarArgs = new vector<unsigned>(Result.NumOperands-2);
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for (unsigned a = 0; a < Result.NumOperands-2; a++)
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if (read_vbr(Buf, EndBuf, (*Result.VarArgs)[a])) return failure(true);
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break;
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}
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if (align32(Buf, EndBuf)) return failure(true);
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break;
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}
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#if 0
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cerr << "NO: " << Result.NumOperands << " opcode: " << Result.Opcode
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<< " Ty: " << Result.Ty->getDescription() << " arg1: " << Result.Arg1
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<< " arg2: " << Result.Arg2 << " arg3: " << Result.Arg3 << endl;
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#endif
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return false;
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}
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bool BytecodeParser::ParseInstruction(const uchar *&Buf, const uchar *EndBuf,
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Instruction *&Res) {
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RawInst Raw;
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if (ParseRawInst(Buf, EndBuf, Raw)) return failure(true);
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if (Raw.Opcode >= Instruction::FirstUnaryOp &&
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Raw.Opcode < Instruction::NumUnaryOps && Raw.NumOperands == 1) {
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Res = UnaryOperator::create((Instruction::UnaryOps)Raw.Opcode,
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getValue(Raw.Ty,Raw.Arg1));
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return false;
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} else if (Raw.Opcode >= Instruction::FirstBinaryOp &&
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Raw.Opcode < Instruction::NumBinaryOps && Raw.NumOperands == 2) {
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Res = BinaryOperator::create((Instruction::BinaryOps)Raw.Opcode,
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getValue(Raw.Ty, Raw.Arg1),
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getValue(Raw.Ty, Raw.Arg2));
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return false;
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}
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Value *V;
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switch (Raw.Opcode) {
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case Instruction::Cast:
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Res = new CastInst(getValue(Raw.Ty, Raw.Arg1), getType(Raw.Arg2));
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return false;
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case Instruction::PHINode: {
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PHINode *PN = new PHINode(Raw.Ty);
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switch (Raw.NumOperands) {
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case 0:
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case 1:
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case 3: cerr << "Invalid phi node encountered!\n";
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delete PN;
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return failure(true);
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case 2: PN->addIncoming(getValue(Raw.Ty, Raw.Arg1),
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(BasicBlock*)getValue(Type::LabelTy, Raw.Arg2));
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break;
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default:
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PN->addIncoming(getValue(Raw.Ty, Raw.Arg1),
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(BasicBlock*)getValue(Type::LabelTy, Raw.Arg2));
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if (Raw.VarArgs->size() & 1) {
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cerr << "PHI Node with ODD number of arguments!\n";
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delete PN;
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return failure(true);
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} else {
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vector<unsigned> &args = *Raw.VarArgs;
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for (unsigned i = 0; i < args.size(); i+=2)
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PN->addIncoming(getValue(Raw.Ty, args[i]),
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(BasicBlock*)getValue(Type::LabelTy, args[i+1]));
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}
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delete Raw.VarArgs;
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break;
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}
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Res = PN;
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return false;
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}
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case Instruction::Shl:
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case Instruction::Shr:
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Res = new ShiftInst((Instruction::OtherOps)Raw.Opcode,
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getValue(Raw.Ty, Raw.Arg1),
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getValue(Type::UByteTy, Raw.Arg2));
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return false;
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case Instruction::Ret:
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if (Raw.NumOperands == 0) {
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Res = new ReturnInst(); return false;
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} else if (Raw.NumOperands == 1) {
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Res = new ReturnInst(getValue(Raw.Ty, Raw.Arg1)); return false;
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}
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break;
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case Instruction::Br:
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if (Raw.NumOperands == 1) {
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Res = new BranchInst((BasicBlock*)getValue(Type::LabelTy, Raw.Arg1));
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return false;
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} else if (Raw.NumOperands == 3) {
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Res = new BranchInst((BasicBlock*)getValue(Type::LabelTy, Raw.Arg1),
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(BasicBlock*)getValue(Type::LabelTy, Raw.Arg2),
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getValue(Type::BoolTy , Raw.Arg3));
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return false;
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}
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break;
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case Instruction::Switch: {
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SwitchInst *I =
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new SwitchInst(getValue(Raw.Ty, Raw.Arg1),
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(BasicBlock*)getValue(Type::LabelTy, Raw.Arg2));
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Res = I;
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if (Raw.NumOperands < 3) return false; // No destinations? Wierd.
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if (Raw.NumOperands == 3 || Raw.VarArgs->size() & 1) {
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cerr << "Switch statement with odd number of arguments!\n";
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delete I;
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return failure(true);
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}
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vector<unsigned> &args = *Raw.VarArgs;
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for (unsigned i = 0; i < args.size(); i += 2)
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I->dest_push_back((ConstPoolVal*)getValue(Raw.Ty, args[i]),
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(BasicBlock*)getValue(Type::LabelTy, args[i+1]));
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delete Raw.VarArgs;
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return false;
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}
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case Instruction::Call: {
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Method *M = (Method*)getValue(Raw.Ty, Raw.Arg1);
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if (M == 0) return failure(true);
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vector<Value *> Params;
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const MethodType::ParamTypes &PL = M->getMethodType()->getParamTypes();
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if (!M->getType()->isMethodType()->isVarArg()) {
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MethodType::ParamTypes::const_iterator It = PL.begin();
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switch (Raw.NumOperands) {
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case 0: cerr << "Invalid call instruction encountered!\n";
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return failure(true);
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case 1: break;
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case 2: Params.push_back(getValue(*It++, Raw.Arg2)); break;
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case 3: Params.push_back(getValue(*It++, Raw.Arg2));
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if (It == PL.end()) return failure(true);
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Params.push_back(getValue(*It++, Raw.Arg3)); break;
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default:
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Params.push_back(getValue(*It++, Raw.Arg2));
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{
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vector<unsigned> &args = *Raw.VarArgs;
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for (unsigned i = 0; i < args.size(); i++) {
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if (It == PL.end()) return failure(true);
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// TODO: Check getValue for null!
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Params.push_back(getValue(*It++, args[i]));
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}
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}
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delete Raw.VarArgs;
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}
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if (It != PL.end()) return failure(true);
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} else {
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// The first parameter does not have a type specifier... because there
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// must be at least one concrete argument to a vararg type...
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Params.push_back(getValue(PL.front(), Raw.Arg2));
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vector<unsigned> &args = *Raw.VarArgs;
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if ((args.size() & 1) != 0)
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return failure(true); // Must be pairs of type/value
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for (unsigned i = 0; i < args.size(); i+=2) {
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// TODO: Check getValue for null!
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Params.push_back(getValue(getType(args[i]), args[i+1]));
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}
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delete Raw.VarArgs;
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}
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Res = new CallInst(M, Params);
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return false;
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}
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case Instruction::Malloc:
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if (Raw.NumOperands > 2) return failure(true);
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V = Raw.NumOperands ? getValue(Type::UIntTy, Raw.Arg1) : 0;
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Res = new MallocInst(Raw.Ty, V);
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return false;
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case Instruction::Alloca:
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if (Raw.NumOperands > 2) return failure(true);
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V = Raw.NumOperands ? getValue(Type::UIntTy, Raw.Arg1) : 0;
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Res = new AllocaInst(Raw.Ty, V);
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return false;
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case Instruction::Free:
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V = getValue(Raw.Ty, Raw.Arg1);
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if (!V->getType()->isPointerType()) return failure(true);
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Res = new FreeInst(V);
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return false;
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case Instruction::Load:
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case Instruction::GetElementPtr: {
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vector<ConstPoolVal*> Idx;
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switch (Raw.NumOperands) {
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case 0: cerr << "Invalid load encountered!\n"; return failure(true);
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case 1: break;
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case 2: V = getValue(Type::UByteTy, Raw.Arg2);
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if (!V->isConstant()) return failure(true);
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Idx.push_back(V->castConstant());
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break;
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case 3: V = getValue(Type::UByteTy, Raw.Arg2);
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if (!V->isConstant()) return failure(true);
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Idx.push_back(V->castConstant());
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V = getValue(Type::UByteTy, Raw.Arg3);
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if (!V->isConstant()) return failure(true);
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Idx.push_back(V->castConstant());
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break;
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default:
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V = getValue(Type::UByteTy, Raw.Arg2);
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if (!V->isConstant()) return failure(true);
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Idx.push_back(V->castConstant());
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vector<unsigned> &args = *Raw.VarArgs;
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for (unsigned i = 0, E = args.size(); i != E; ++i) {
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V = getValue(Type::UByteTy, args[i]);
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if (!V->isConstant()) return failure(true);
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Idx.push_back(V->castConstant());
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}
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delete Raw.VarArgs;
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break;
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}
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if (Raw.Opcode == Instruction::Load)
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Res = new LoadInst(getValue(Raw.Ty, Raw.Arg1), Idx);
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else if (Raw.Opcode == Instruction::GetElementPtr)
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Res = new GetElementPtrInst(getValue(Raw.Ty, Raw.Arg1), Idx);
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else
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abort();
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return false;
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}
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case Instruction::Store: {
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vector<ConstPoolVal*> Idx;
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switch (Raw.NumOperands) {
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case 0:
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case 1: cerr << "Invalid store encountered!\n"; return failure(true);
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case 2: break;
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case 3: V = getValue(Type::UByteTy, Raw.Arg3);
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if (!V->isConstant()) return failure(true);
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Idx.push_back(V->castConstant());
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break;
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default:
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vector<unsigned> &args = *Raw.VarArgs;
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for (unsigned i = 0, E = args.size(); i != E; ++i) {
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V = getValue(Type::UByteTy, args[i]);
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if (!V->isConstant()) return failure(true);
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Idx.push_back(V->castConstant());
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}
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delete Raw.VarArgs;
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break;
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}
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const Type *ElType = StoreInst::getIndexedType(Raw.Ty, Idx);
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if (ElType == 0) return failure(true);
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Res = new StoreInst(getValue(ElType, Raw.Arg1), getValue(Raw.Ty, Raw.Arg2),
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Idx);
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return false;
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}
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} // end switch(Raw.Opcode)
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cerr << "Unrecognized instruction! " << Raw.Opcode
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<< " ADDR = 0x" << (void*)Buf << endl;
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return failure(true);
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}
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