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b576c94c15
Header files will be on the way. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@9298 91177308-0d34-0410-b5e6-96231b3b80d8
392 lines
13 KiB
C++
392 lines
13 KiB
C++
//===- ReadInst.cpp - Code to read an instruction from bytecode -----------===//
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//
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// The LLVM Compiler Infrastructure
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//
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// This file was developed by the LLVM research group and is distributed under
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// the University of Illinois Open Source License. See LICENSE.TXT for details.
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//
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//===----------------------------------------------------------------------===//
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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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//===----------------------------------------------------------------------===//
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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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#include "llvm/Module.h"
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namespace {
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struct RawInst { // The raw fields out of the bytecode stream...
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unsigned NumOperands;
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unsigned Opcode;
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unsigned Type;
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RawInst(const unsigned char *&Buf, const unsigned char *EndBuf,
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std::vector<unsigned> &Args);
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};
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}
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RawInst::RawInst(const unsigned char *&Buf, const unsigned char *EndBuf,
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std::vector<unsigned> &Args) {
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unsigned Op, Typ;
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if (read(Buf, EndBuf, Op))
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throw std::string("Error reading from buffer.");
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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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Opcode = (Op >> 2) & 63;
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Args.resize((Op >> 0) & 03);
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switch (Args.size()) {
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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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Type = (Op >> 8) & 4095;
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Args[0] = (Op >> 20) & 4095;
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if (Args[0] == 4095) // Handle special encoding for 0 operands...
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Args.resize(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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Type = (Op >> 8) & 255;
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Args[0] = (Op >> 16) & 255;
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Args[1] = (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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Type = (Op >> 8) & 63;
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Args[0] = (Op >> 14) & 63;
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Args[1] = (Op >> 20) & 63;
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Args[2] = (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, Opcode))
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throw std::string("Error reading from buffer.");
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Opcode >>= 2;
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if (read_vbr(Buf, EndBuf, Type))
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throw std::string("Error reading from buffer.");
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unsigned NumOperands;
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if (read_vbr(Buf, EndBuf, NumOperands))
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throw std::string("Error reading from buffer.");
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Args.resize(NumOperands);
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if (NumOperands == 0)
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throw std::string("Zero-argument instruction found; this is invalid.");
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for (unsigned i = 0; i != NumOperands; ++i)
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if (read_vbr(Buf, EndBuf, Args[i]))
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throw std::string("Error reading from buffer");
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if (align32(Buf, EndBuf))
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throw std::string("Unaligned bytecode buffer.");
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break;
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}
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}
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void BytecodeParser::ParseInstruction(const unsigned char *&Buf,
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const unsigned char *EndBuf,
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std::vector<unsigned> &Args,
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BasicBlock *BB) {
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Args.clear();
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RawInst RI(Buf, EndBuf, Args);
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const Type *InstTy = getType(RI.Type);
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Instruction *Result = 0;
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if (RI.Opcode >= Instruction::BinaryOpsBegin &&
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RI.Opcode < Instruction::BinaryOpsEnd && Args.size() == 2)
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Result = BinaryOperator::create((Instruction::BinaryOps)RI.Opcode,
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getValue(RI.Type, Args[0]),
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getValue(RI.Type, Args[1]));
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switch (RI.Opcode) {
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default:
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if (Result == 0) throw std::string("Illegal instruction read!");
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break;
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case Instruction::VAArg:
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Result = new VAArgInst(getValue(RI.Type, Args[0]), getType(Args[1]));
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break;
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case Instruction::VANext:
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if (!hasOldStyleVarargs) {
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Result = new VANextInst(getValue(RI.Type, Args[0]), getType(Args[1]));
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} else {
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// In the old-style varargs scheme, this was the "va_arg" instruction.
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// Emit emulation code now.
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if (!usesOldStyleVarargs) {
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usesOldStyleVarargs = true;
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std::cerr << "WARNING: this bytecode file uses obsolete features. "
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<< "Disassemble and assemble to update it.\n";
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}
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Value *VAListPtr = getValue(RI.Type, Args[0]);
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const Type *ArgTy = getType(Args[1]);
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// First, load the valist...
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Instruction *CurVAList = new LoadInst(VAListPtr, "");
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BB->getInstList().push_back(CurVAList);
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// Construct the vaarg
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Result = new VAArgInst(CurVAList, ArgTy);
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// Now we must advance the pointer and update it in memory.
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Instruction *TheVANext = new VANextInst(CurVAList, ArgTy);
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BB->getInstList().push_back(TheVANext);
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BB->getInstList().push_back(new StoreInst(TheVANext, VAListPtr));
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}
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break;
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case Instruction::Cast:
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Result = new CastInst(getValue(RI.Type, Args[0]), getType(Args[1]));
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break;
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case Instruction::PHI: {
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if (Args.size() == 0 || (Args.size() & 1))
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throw std::string("Invalid phi node encountered!\n");
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PHINode *PN = new PHINode(InstTy);
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PN->op_reserve(Args.size());
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for (unsigned i = 0, e = Args.size(); i != e; i += 2)
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PN->addIncoming(getValue(RI.Type, Args[i]), getBasicBlock(Args[i+1]));
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Result = PN;
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break;
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}
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case Instruction::Shl:
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case Instruction::Shr:
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Result = new ShiftInst((Instruction::OtherOps)RI.Opcode,
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getValue(RI.Type, Args[0]),
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getValue(Type::UByteTyID, Args[1]));
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break;
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case Instruction::Ret:
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if (Args.size() == 0)
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Result = new ReturnInst();
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else if (Args.size() == 1)
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Result = new ReturnInst(getValue(RI.Type, Args[0]));
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else
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throw std::string("Unrecognized instruction!");
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break;
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case Instruction::Br:
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if (Args.size() == 1)
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Result = new BranchInst(getBasicBlock(Args[0]));
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else if (Args.size() == 3)
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Result = new BranchInst(getBasicBlock(Args[0]), getBasicBlock(Args[1]),
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getValue(Type::BoolTyID , Args[2]));
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else
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throw std::string("Invalid number of operands for a 'br' instruction!");
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break;
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case Instruction::Switch: {
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if (Args.size() & 1)
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throw std::string("Switch statement with odd number of arguments!");
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SwitchInst *I = new SwitchInst(getValue(RI.Type, Args[0]),
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getBasicBlock(Args[1]));
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for (unsigned i = 2, e = Args.size(); i != e; i += 2)
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I->addCase(cast<Constant>(getValue(RI.Type, Args[i])),
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getBasicBlock(Args[i+1]));
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Result = I;
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break;
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}
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case Instruction::Call: {
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if (Args.size() == 0)
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throw std::string("Invalid call instruction encountered!");
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Value *F = getValue(RI.Type, Args[0]);
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// Check to make sure we have a pointer to function type
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const PointerType *PTy = dyn_cast<PointerType>(F->getType());
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if (PTy == 0) throw std::string("Call to non function pointer value!");
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const FunctionType *FTy = dyn_cast<FunctionType>(PTy->getElementType());
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if (FTy == 0) throw std::string("Call to non function pointer value!");
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std::vector<Value *> Params;
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const FunctionType::ParamTypes &PL = FTy->getParamTypes();
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if (!FTy->isVarArg()) {
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FunctionType::ParamTypes::const_iterator It = PL.begin();
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for (unsigned i = 1, e = Args.size(); i != e; ++i) {
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if (It == PL.end()) throw std::string("Invalid call instruction!");
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Params.push_back(getValue(*It++, Args[i]));
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}
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if (It != PL.end()) throw std::string("Invalid call instruction!");
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} else {
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Args.erase(Args.begin(), Args.begin()+1+hasVarArgCallPadding);
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unsigned FirstVariableOperand;
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if (!hasVarArgCallPadding) {
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if (Args.size() < FTy->getNumParams())
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throw std::string("Call instruction missing operands!");
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// Read all of the fixed arguments
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for (unsigned i = 0, e = FTy->getNumParams(); i != e; ++i)
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Params.push_back(getValue(FTy->getParamType(i), Args[i]));
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FirstVariableOperand = FTy->getNumParams();
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} else {
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FirstVariableOperand = 0;
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}
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if ((Args.size()-FirstVariableOperand) & 1) // Must be pairs of type/value
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throw std::string("Invalid call instruction!");
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for (unsigned i = FirstVariableOperand, e = Args.size(); i != e; i += 2)
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Params.push_back(getValue(Args[i], Args[i+1]));
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}
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Result = new CallInst(F, Params);
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break;
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}
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case Instruction::Invoke: {
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if (Args.size() < 3) throw std::string("Invalid invoke instruction!");
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Value *F = getValue(RI.Type, Args[0]);
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// Check to make sure we have a pointer to function type
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const PointerType *PTy = dyn_cast<PointerType>(F->getType());
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if (PTy == 0) throw std::string("Invoke to non function pointer value!");
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const FunctionType *FTy = dyn_cast<FunctionType>(PTy->getElementType());
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if (FTy == 0) throw std::string("Invoke to non function pointer value!");
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std::vector<Value *> Params;
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BasicBlock *Normal, *Except;
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const FunctionType::ParamTypes &PL = FTy->getParamTypes();
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if (!FTy->isVarArg()) {
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Normal = getBasicBlock(Args[1]);
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Except = getBasicBlock(Args[2]);
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FunctionType::ParamTypes::const_iterator It = PL.begin();
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for (unsigned i = 3, e = Args.size(); i != e; ++i) {
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if (It == PL.end()) throw std::string("Invalid invoke instruction!");
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Params.push_back(getValue(*It++, Args[i]));
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}
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if (It != PL.end()) throw std::string("Invalid invoke instruction!");
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} else {
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Args.erase(Args.begin(), Args.begin()+1+hasVarArgCallPadding);
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unsigned FirstVariableArgument;
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if (!hasVarArgCallPadding) {
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Normal = getBasicBlock(Args[0]);
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Except = getBasicBlock(Args[1]);
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FirstVariableArgument = FTy->getNumParams()+2;
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for (unsigned i = 2; i != FirstVariableArgument; ++i)
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Params.push_back(getValue(FTy->getParamType(i-2), Args[i]));
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} else {
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if (Args.size() < 4) throw std::string("Invalid invoke instruction!");
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if (Args[0] != Type::LabelTyID || Args[2] != Type::LabelTyID)
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throw std::string("Invalid invoke instruction!");
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Normal = getBasicBlock(Args[1]);
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Except = getBasicBlock(Args[3]);
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FirstVariableArgument = 4;
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}
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if (Args.size()-FirstVariableArgument & 1) // Must be pairs of type/value
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throw std::string("Invalid invoke instruction!");
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for (unsigned i = FirstVariableArgument; i < Args.size(); i += 2)
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Params.push_back(getValue(Args[i], Args[i+1]));
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}
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Result = new InvokeInst(F, Normal, Except, Params);
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break;
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}
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case Instruction::Malloc:
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if (Args.size() > 2) throw std::string("Invalid malloc instruction!");
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if (!isa<PointerType>(InstTy))
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throw std::string("Invalid malloc instruction!");
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Result = new MallocInst(cast<PointerType>(InstTy)->getElementType(),
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Args.size() ? getValue(Type::UIntTyID,
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Args[0]) : 0);
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break;
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case Instruction::Alloca:
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if (Args.size() > 2) throw std::string("Invalid alloca instruction!");
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if (!isa<PointerType>(InstTy))
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throw std::string("Invalid alloca instruction!");
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Result = new AllocaInst(cast<PointerType>(InstTy)->getElementType(),
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Args.size() ? getValue(Type::UIntTyID, Args[0]) :0);
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break;
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case Instruction::Free:
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if (!isa<PointerType>(InstTy))
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throw std::string("Invalid free instruction!");
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Result = new FreeInst(getValue(RI.Type, Args[0]));
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break;
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case Instruction::GetElementPtr: {
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if (Args.size() == 0 || !isa<PointerType>(InstTy))
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throw std::string("Invalid getelementptr instruction!");
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std::vector<Value*> Idx;
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const Type *NextTy = InstTy;
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for (unsigned i = 1, e = Args.size(); i != e; ++i) {
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const CompositeType *TopTy = dyn_cast_or_null<CompositeType>(NextTy);
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if (!TopTy) throw std::string("Invalid getelementptr instruction!");
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Idx.push_back(getValue(TopTy->getIndexType(), Args[i]));
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NextTy = GetElementPtrInst::getIndexedType(InstTy, Idx, true);
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}
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Result = new GetElementPtrInst(getValue(RI.Type, Args[0]), Idx);
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break;
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}
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case 62: // volatile load
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case Instruction::Load:
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if (Args.size() != 1 || !isa<PointerType>(InstTy))
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throw std::string("Invalid load instruction!");
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Result = new LoadInst(getValue(RI.Type, Args[0]), "", RI.Opcode == 62);
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break;
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case 63: // volatile store
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case Instruction::Store: {
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if (!isa<PointerType>(InstTy) || Args.size() != 2)
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throw std::string("Invalid store instruction!");
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Value *Ptr = getValue(RI.Type, Args[1]);
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const Type *ValTy = cast<PointerType>(Ptr->getType())->getElementType();
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Result = new StoreInst(getValue(ValTy, Args[0]), Ptr, RI.Opcode == 63);
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break;
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}
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case Instruction::Unwind:
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if (Args.size() != 0) throw std::string("Invalid unwind instruction!");
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Result = new UnwindInst();
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break;
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} // end switch(RI.Opcode)
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insertValue(Result, Values);
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BB->getInstList().push_back(Result);
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BCR_TRACE(4, *Result);
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}
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