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472 lines
15 KiB
C++
472 lines
15 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 "ReaderInternals.h"
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#include "llvm/iTerminators.h"
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#include "llvm/iMemory.h"
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#include "llvm/iPHINode.h"
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#include "llvm/iOther.h"
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using std::vector;
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using std::cerr;
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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 true;
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// bits Instruction format: Common to all formats
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// --------------------------
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// 01-00: Opcode type, fixed to 1.
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// 07-02: Opcode
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Result.NumOperands = (Op >> 0) & 03;
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Result.Opcode = (Op >> 2) & 63;
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switch (Result.NumOperands) {
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case 1:
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// bits Instruction format:
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// --------------------------
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// 19-08: Resulting type plane
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// 31-20: Operand #1 (if set to (2^12-1), then zero operands)
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//
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Result.Ty = getType((Op >> 8) & 4095);
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Result.Arg1 = (Op >> 20) & 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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// bits Instruction format:
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// --------------------------
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// 15-08: Resulting type plane
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// 23-16: Operand #1
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// 31-24: Operand #2
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//
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Result.Ty = getType((Op >> 8) & 255);
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Result.Arg1 = (Op >> 16) & 255;
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Result.Arg2 = (Op >> 24) & 255;
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break;
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case 3:
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// bits Instruction format:
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// --------------------------
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// 13-08: Resulting type plane
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// 19-14: Operand #1
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// 25-20: Operand #2
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// 31-26: Operand #3
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//
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Result.Ty = getType((Op >> 8) & 63);
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Result.Arg1 = (Op >> 14) & 63;
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Result.Arg2 = (Op >> 20) & 63;
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Result.Arg3 = (Op >> 26) & 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 true;
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Result.Opcode >>= 2;
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if (read_vbr(Buf, EndBuf, Typ)) return true;
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Result.Ty = getType(Typ);
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if (Result.Ty == 0) return true;
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if (read_vbr(Buf, EndBuf, Result.NumOperands)) return 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 true; // This encoding is invalid!
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case 1:
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if (read_vbr(Buf, EndBuf, Result.Arg1)) return 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 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 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 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 true;
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break;
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}
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if (align32(Buf, EndBuf)) return 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 << "\n";
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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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BasicBlock *BB /*HACK*/) {
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RawInst Raw;
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if (ParseRawInst(Buf, EndBuf, Raw))
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return true;
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if (Raw.Opcode >= Instruction::BinaryOpsBegin &&
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Raw.Opcode < Instruction::BinaryOpsEnd && 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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V = getValue(Raw.Ty, Raw.Arg1);
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const Type *Ty = getType(Raw.Arg2);
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if (V == 0 || Ty == 0) { cerr << "Invalid cast!\n"; return true; }
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Res = new CastInst(V, Ty);
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return false;
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}
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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 true;
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case 2: PN->addIncoming(getValue(Raw.Ty, Raw.Arg1),
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cast<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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cast<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 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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cast<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(cast<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(cast<BasicBlock>(getValue(Type::LabelTy, Raw.Arg1)),
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cast<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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cast<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 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(cast<Constant>(getValue(Raw.Ty, args[i])),
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cast<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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Value *M = getValue(Raw.Ty, Raw.Arg1);
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if (M == 0) return true;
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// Check to make sure we have a pointer to method type
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const PointerType *PTy = dyn_cast<PointerType>(M->getType());
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if (PTy == 0) return true;
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const FunctionType *MTy = dyn_cast<FunctionType>(PTy->getElementType());
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if (MTy == 0) return true;
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vector<Value *> Params;
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const FunctionType::ParamTypes &PL = MTy->getParamTypes();
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if (!MTy->isVarArg()) {
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FunctionType::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 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 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 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 true;
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} else {
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if (Raw.NumOperands > 2) {
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vector<unsigned> &args = *Raw.VarArgs;
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if (args.size() < 1) return true;
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if ((args.size() & 1) != 0)
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return true; // Must be pairs of type/value
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for (unsigned i = 0; i < args.size(); i+=2) {
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const Type *Ty = getType(args[i]);
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if (Ty == 0)
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return true;
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Value *V = getValue(Ty, args[i+1]);
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if (V == 0) return true;
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Params.push_back(V);
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}
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delete Raw.VarArgs;
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}
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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::Invoke: {
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Value *M = getValue(Raw.Ty, Raw.Arg1);
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if (M == 0) return true;
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// Check to make sure we have a pointer to method type
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const PointerType *PTy = dyn_cast<PointerType>(M->getType());
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if (PTy == 0) return true;
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const FunctionType *MTy = dyn_cast<FunctionType>(PTy->getElementType());
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if (MTy == 0) return true;
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vector<Value *> Params;
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const FunctionType::ParamTypes &PL = MTy->getParamTypes();
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vector<unsigned> &args = *Raw.VarArgs;
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BasicBlock *Normal, *Except;
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if (!MTy->isVarArg()) {
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if (Raw.NumOperands < 3) return true;
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Normal = cast<BasicBlock>(getValue(Type::LabelTy, Raw.Arg2));
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Except = cast<BasicBlock>(getValue(Type::LabelTy, args[0]));
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FunctionType::ParamTypes::const_iterator It = PL.begin();
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for (unsigned i = 1; i < args.size(); i++) {
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if (It == PL.end()) return 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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if (It != PL.end()) return true;
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} else {
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if (args.size() < 4) return true;
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Normal = cast<BasicBlock>(getValue(Type::LabelTy, args[0]));
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Except = cast<BasicBlock>(getValue(Type::LabelTy, args[2]));
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if ((args.size() & 1) != 0)
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return true; // Must be pairs of type/value
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for (unsigned i = 4; 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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}
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delete Raw.VarArgs;
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Res = new InvokeInst(M, Normal, Except, 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 true;
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V = Raw.NumOperands ? getValue(Type::UIntTy, Raw.Arg1) : 0;
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if (const PointerType *PTy = dyn_cast<PointerType>(Raw.Ty))
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Res = new MallocInst(PTy->getElementType(), V);
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else
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return true;
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return false;
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case Instruction::Alloca:
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if (Raw.NumOperands > 2) return true;
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V = Raw.NumOperands ? getValue(Type::UIntTy, Raw.Arg1) : 0;
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if (const PointerType *PTy = dyn_cast<PointerType>(Raw.Ty))
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Res = new AllocaInst(PTy->getElementType(), V);
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else
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return true;
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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 (!isa<PointerType>(V->getType())) return 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<Value*> Idx;
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if (!isa<PointerType>(Raw.Ty)) return true;
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const CompositeType *TopTy = dyn_cast<CompositeType>(Raw.Ty);
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switch (Raw.NumOperands) {
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case 0: cerr << "Invalid load encountered!\n"; return true;
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case 1: break;
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case 2:
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if (!TopTy) return true;
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Idx.push_back(V = getValue(TopTy->getIndexType(), Raw.Arg2));
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if (!V) return true;
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break;
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case 3: {
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if (!TopTy) return true;
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Idx.push_back(V = getValue(TopTy->getIndexType(), Raw.Arg2));
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if (!V) return true;
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const Type *ETy = GetElementPtrInst::getIndexedType(TopTy, Idx, true);
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const CompositeType *ElTy = dyn_cast_or_null<CompositeType>(ETy);
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if (!ElTy) return true;
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Idx.push_back(V = getValue(ElTy->getIndexType(), Raw.Arg3));
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if (!V) return true;
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break;
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}
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default:
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if (!TopTy) return true;
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Idx.push_back(V = getValue(TopTy->getIndexType(), Raw.Arg2));
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if (!V) return true;
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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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const Type *ETy = GetElementPtrInst::getIndexedType(Raw.Ty, Idx, true);
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const CompositeType *ElTy = dyn_cast_or_null<CompositeType>(ETy);
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if (!ElTy) return true;
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Idx.push_back(V = getValue(ElTy->getIndexType(), args[i]));
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if (!V) return true;
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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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Value *Src = getValue(Raw.Ty, Raw.Arg1);
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if (!Idx.empty()) {
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cerr << "WARNING: Bytecode contains load instruction with indices. "
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<< "Replacing with getelementptr/load pair\n";
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assert(GetElementPtrInst::getIndexedType(Raw.Ty, Idx) &&
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"Bad indices for Load!");
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Src = new GetElementPtrInst(Src, Idx);
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// FIXME: Remove this compatibility code and the BB parameter to this
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// method.
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BB->getInstList().push_back(cast<Instruction>(Src));
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}
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Res = new LoadInst(Src);
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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<Value*> Idx;
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if (!isa<PointerType>(Raw.Ty)) return true;
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const CompositeType *TopTy = dyn_cast<CompositeType>(Raw.Ty);
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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 true;
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case 2: break;
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case 3:
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if (!TopTy) return true;
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Idx.push_back(V = getValue(TopTy->getIndexType(), Raw.Arg3));
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if (!V) return true;
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break;
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default:
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vector<unsigned> &args = *Raw.VarArgs;
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const CompositeType *ElTy = TopTy;
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unsigned i, E;
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for (i = 0, E = args.size(); ElTy && i != E; ++i) {
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Idx.push_back(V = getValue(ElTy->getIndexType(), args[i]));
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if (!V) return true;
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const Type *ETy = GetElementPtrInst::getIndexedType(Raw.Ty, Idx, true);
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ElTy = dyn_cast_or_null<CompositeType>(ETy);
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}
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if (i != E)
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return true; // didn't use up all of the indices!
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delete Raw.VarArgs;
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break;
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}
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Value *Ptr = getValue(Raw.Ty, Raw.Arg2);
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if (!Idx.empty()) {
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cerr << "WARNING: Bytecode contains load instruction with indices. "
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<< "Replacing with getelementptr/load pair\n";
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const Type *ElType = GetElementPtrInst::getIndexedType(Raw.Ty, Idx);
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if (ElType == 0) return true;
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Ptr = new GetElementPtrInst(Ptr, Idx);
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// FIXME: Remove this compatibility code and the BB parameter to this
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// method.
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BB->getInstList().push_back(cast<Instruction>(Ptr));
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}
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const Type *ValTy = cast<PointerType>(Ptr->getType())->getElementType();
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Res = new StoreInst(getValue(ValTy, Raw.Arg1), Ptr);
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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 << "\n";
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return true;
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}
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