-//===-- WriteInst.cpp - Functions for writing instructions -------*- C++ -*--=//
+//===-- InstructionWriter.cpp - Functions for writing instructions --------===//
+//
+// The LLVM Compiler Infrastructure
+//
+// This file was developed by the LLVM research group and is distributed under
+// the University of Illinois Open Source License. See LICENSE.TXT for details.
+//
+//===----------------------------------------------------------------------===//
//
// This file implements the routines for encoding instruction opcodes to a
// bytecode stream.
//
-// Note that the performance of this library is not terribly important, because
-// it shouldn't be used by JIT type applications... so it is not a huge focus
-// at least. :)
-//
//===----------------------------------------------------------------------===//
#include "WriterInternals.h"
#include "llvm/Module.h"
-#include "llvm/Method.h"
-#include "llvm/BasicBlock.h"
-#include "llvm/Instruction.h"
#include "llvm/DerivedTypes.h"
-#include "llvm/Tools/DataTypes.h"
+#include "llvm/Instructions.h"
+#include "Support/Statistic.h"
#include <algorithm>
+static Statistic<>
+NumInstrs("bytecodewriter", "Number of instructions");
+
typedef unsigned char uchar;
// outputInstructionFormat0 - Output those wierd instructions that have a large
//
// Format: [opcode] [type] [numargs] [arg0] [arg1] ... [arg<numargs-1>]
//
-static void outputInstructionFormat0(const Instruction *I,
+static void outputInstructionFormat0(const Instruction *I, unsigned Opcode,
const SlotCalculator &Table,
- unsigned Type, vector<uchar> &Out) {
+ unsigned Type, std::deque<uchar> &Out) {
// Opcode must have top two bits clear...
- output_vbr(I->getInstType(), Out); // Instruction Opcode ID
+ output_vbr(Opcode << 2, Out); // Instruction Opcode ID
output_vbr(Type, Out); // Result type
- unsigned NumArgs; // Count the number of arguments to the instruction
- for (NumArgs = 0; I->getOperand(NumArgs); NumArgs++) /*empty*/;
- output_vbr(NumArgs, Out);
+ unsigned NumArgs = I->getNumOperands();
+ output_vbr(NumArgs + (isa<CastInst>(I) || isa<VANextInst>(I) ||
+ isa<VAArgInst>(I)), Out);
- for (unsigned i = 0; const Value *N = I->getOperand(i); i++) {
- assert(i < NumArgs && "Count of arguments failed!");
+ for (unsigned i = 0; i < NumArgs; ++i) {
+ int Slot = Table.getSlot(I->getOperand(i));
+ assert(Slot >= 0 && "No slot number for value!?!?");
+ output_vbr((unsigned)Slot, Out);
+ }
- int Slot = Table.getValSlot(N);
+ if (isa<CastInst>(I) || isa<VAArgInst>(I)) {
+ int Slot = Table.getSlot(I->getType());
+ assert(Slot != -1 && "Cast return type unknown?");
+ output_vbr((unsigned)Slot, Out);
+ } else if (const VANextInst *VAI = dyn_cast<VANextInst>(I)) {
+ int Slot = Table.getSlot(VAI->getArgType());
+ assert(Slot != -1 && "VarArg argument type unknown?");
+ output_vbr((unsigned)Slot, Out);
+ }
+
+ align32(Out); // We must maintain correct alignment!
+}
+
+
+// outputInstrVarArgsCall - Output the absurdly annoying varargs function calls.
+// This are more annoying than most because the signature of the call does not
+// tell us anything about the types of the arguments in the varargs portion.
+// Because of this, we encode (as type 0) all of the argument types explicitly
+// before the argument value. This really sucks, but you shouldn't be using
+// varargs functions in your code! *death to printf*!
+//
+// Format: [opcode] [type] [numargs] [arg0] [arg1] ... [arg<numargs-1>]
+//
+static void outputInstrVarArgsCall(const Instruction *I, unsigned Opcode,
+ const SlotCalculator &Table, unsigned Type,
+ std::deque<uchar> &Out) {
+ assert(isa<CallInst>(I) || isa<InvokeInst>(I));
+ // Opcode must have top two bits clear...
+ output_vbr(Opcode << 2, Out); // Instruction Opcode ID
+ output_vbr(Type, Out); // Result type (varargs type)
+
+ const PointerType *PTy = cast<PointerType>(I->getOperand(0)->getType());
+ const FunctionType *FTy = cast<FunctionType>(PTy->getElementType());
+ unsigned NumParams = FTy->getNumParams();
+
+ unsigned NumFixedOperands;
+ if (isa<CallInst>(I)) {
+ // Output an operand for the callee and each fixed argument, then two for
+ // each variable argument.
+ NumFixedOperands = 1+NumParams;
+ } else {
+ assert(isa<InvokeInst>(I) && "Not call or invoke??");
+ // Output an operand for the callee and destinations, then two for each
+ // variable argument.
+ NumFixedOperands = 3+NumParams;
+ }
+ output_vbr(2 * I->getNumOperands()-NumFixedOperands, Out);
+
+ // The type for the function has already been emitted in the type field of the
+ // instruction. Just emit the slot # now.
+ for (unsigned i = 0; i != NumFixedOperands; ++i) {
+ int Slot = Table.getSlot(I->getOperand(i));
+ assert(Slot >= 0 && "No slot number for value!?!?");
+ output_vbr((unsigned)Slot, Out);
+ }
+
+ for (unsigned i = NumFixedOperands, e = I->getNumOperands(); i != e; ++i) {
+ // Output Arg Type ID
+ int Slot = Table.getSlot(I->getOperand(i)->getType());
+ assert(Slot >= 0 && "No slot number for value!?!?");
+ output_vbr((unsigned)Slot, Out);
+
+ // Output arg ID itself
+ Slot = Table.getSlot(I->getOperand(i));
+ assert(Slot >= 0 && "No slot number for value!?!?");
output_vbr((unsigned)Slot, Out);
}
align32(Out); // We must maintain correct alignment!
// outputInstructionFormat1 - Output one operand instructions, knowing that no
// operand index is >= 2^12.
//
-static void outputInstructionFormat1(const Instruction *I,
+static void outputInstructionFormat1(const Instruction *I, unsigned Opcode,
const SlotCalculator &Table, int *Slots,
- unsigned Type, vector<uchar> &Out) {
- unsigned IType = I->getInstType(); // Instruction Opcode ID
-
+ unsigned Type, std::deque<uchar> &Out) {
// bits Instruction format:
// --------------------------
- // 31-30: Opcode type, fixed to 1.
- // 29-24: Opcode
- // 23-12: Resulting type plane
- // 11- 0: Operand #1 (if set to (2^12-1), then zero operands)
+ // 01-00: Opcode type, fixed to 1.
+ // 07-02: Opcode
+ // 19-08: Resulting type plane
+ // 31-20: Operand #1 (if set to (2^12-1), then zero operands)
//
- unsigned Opcode = (1 << 30) | (IType << 24) | (Type << 12) | Slots[0];
+ unsigned Bits = 1 | (Opcode << 2) | (Type << 8) | (Slots[0] << 20);
// cerr << "1 " << IType << " " << Type << " " << Slots[0] << endl;
- output(Opcode, Out);
+ output(Bits, Out);
}
// outputInstructionFormat2 - Output two operand instructions, knowing that no
// operand index is >= 2^8.
//
-static void outputInstructionFormat2(const Instruction *I,
+static void outputInstructionFormat2(const Instruction *I, unsigned Opcode,
const SlotCalculator &Table, int *Slots,
- unsigned Type, vector<uchar> &Out) {
- unsigned IType = I->getInstType(); // Instruction Opcode ID
-
+ unsigned Type, std::deque<uchar> &Out) {
// bits Instruction format:
// --------------------------
- // 31-30: Opcode type, fixed to 2.
- // 29-24: Opcode
- // 23-16: Resulting type plane
- // 15- 8: Operand #1
- // 7- 0: Operand #2
+ // 01-00: Opcode type, fixed to 2.
+ // 07-02: Opcode
+ // 15-08: Resulting type plane
+ // 23-16: Operand #1
+ // 31-24: Operand #2
//
- unsigned Opcode = (2 << 30) | (IType << 24) | (Type << 16) |
- (Slots[0] << 8) | (Slots[1] << 0);
+ unsigned Bits = 2 | (Opcode << 2) | (Type << 8) |
+ (Slots[0] << 16) | (Slots[1] << 24);
// cerr << "2 " << IType << " " << Type << " " << Slots[0] << " "
// << Slots[1] << endl;
- output(Opcode, Out);
+ output(Bits, Out);
}
// outputInstructionFormat3 - Output three operand instructions, knowing that no
// operand index is >= 2^6.
//
-static void outputInstructionFormat3(const Instruction *I,
+static void outputInstructionFormat3(const Instruction *I, unsigned Opcode,
const SlotCalculator &Table, int *Slots,
- unsigned Type, vector<uchar> &Out) {
- unsigned IType = I->getInstType(); // Instruction Opcode ID
-
+ unsigned Type, std::deque<uchar> &Out) {
// bits Instruction format:
// --------------------------
- // 31-30: Opcode type, fixed to 3
- // 29-24: Opcode
- // 23-18: Resulting type plane
- // 17-12: Operand #1
- // 11- 6: Operand #2
- // 5- 0: Operand #3
+ // 01-00: Opcode type, fixed to 3.
+ // 07-02: Opcode
+ // 13-08: Resulting type plane
+ // 19-14: Operand #1
+ // 25-20: Operand #2
+ // 31-26: Operand #3
//
- unsigned Opcode = (3 << 30) | (IType << 24) | (Type << 18) |
- (Slots[0] << 12) | (Slots[1] << 6) | (Slots[2] << 0);
- // cerr << "3 " << IType << " " << Type << " " << Slots[0] << " "
- // << Slots[1] << " " << Slots[2] << endl;
- output(Opcode, Out);
+ unsigned Bits = 3 | (Opcode << 2) | (Type << 8) |
+ (Slots[0] << 14) | (Slots[1] << 20) | (Slots[2] << 26);
+ //cerr << "3 " << IType << " " << Type << " " << Slots[0] << " "
+ // << Slots[1] << " " << Slots[2] << endl;
+ output(Bits, Out);
}
-bool BytecodeWriter::processInstruction(const Instruction *I) {
- assert(I->getInstType() < 64 && "Opcode too big???");
+void BytecodeWriter::processInstruction(const Instruction &I) {
+ assert(I.getOpcode() < 62 && "Opcode too big???");
+ unsigned Opcode = I.getOpcode();
- unsigned NumOperands = 0;
+ // Encode 'volatile load' as 62 and 'volatile store' as 63.
+ if (isa<LoadInst>(I) && cast<LoadInst>(I).isVolatile())
+ Opcode = 62;
+ if (isa<StoreInst>(I) && cast<StoreInst>(I).isVolatile())
+ Opcode = 63;
+
+ unsigned NumOperands = I.getNumOperands();
int MaxOpSlot = 0;
- int Slots[3]; Slots[0] = (1 << 12)-1;
+ int Slots[3]; Slots[0] = (1 << 12)-1; // Marker to signify 0 operands
- const Value *Def;
- while ((Def = I->getOperand(NumOperands))) {
- int slot = Table.getValSlot(Def);
+ for (unsigned i = 0; i < NumOperands; ++i) {
+ const Value *Def = I.getOperand(i);
+ int slot = Table.getSlot(Def);
assert(slot != -1 && "Broken bytecode!");
if (slot > MaxOpSlot) MaxOpSlot = slot;
- if (NumOperands < 3) Slots[NumOperands] = slot;
- NumOperands++;
+ if (i < 3) Slots[i] = slot;
}
// Figure out which type to encode with the instruction. Typically we want
// the first param is actually interesting). But if we have no arguments
// we take the type of the instruction itself.
//
-
const Type *Ty;
- if (NumOperands)
- Ty = I->getOperand(0)->getType();
- else
- Ty = I->getType();
+ switch (I.getOpcode()) {
+ case Instruction::Malloc:
+ case Instruction::Alloca:
+ Ty = I.getType(); // Malloc & Alloca ALWAYS want to encode the return type
+ break;
+ case Instruction::Store:
+ Ty = I.getOperand(1)->getType(); // Encode the pointer type...
+ assert(isa<PointerType>(Ty) && "Store to nonpointer type!?!?");
+ break;
+ default: // Otherwise use the default behavior...
+ Ty = NumOperands ? I.getOperand(0)->getType() : I.getType();
+ break;
+ }
unsigned Type;
- int Slot = Table.getValSlot(Ty);
+ int Slot = Table.getSlot(Ty);
assert(Slot != -1 && "Type not available!!?!");
Type = (unsigned)Slot;
+ // Make sure that we take the type number into consideration. We don't want
+ // to overflow the field size for the instruction format we select.
+ //
+ if (Slot > MaxOpSlot) MaxOpSlot = Slot;
+
+ // Handle the special case for cast...
+ if (isa<CastInst>(I) || isa<VAArgInst>(I)) {
+ // Cast has to encode the destination type as the second argument in the
+ // packet, or else we won't know what type to cast to!
+ Slots[1] = Table.getSlot(I.getType());
+ assert(Slots[1] != -1 && "Cast return type unknown?");
+ if (Slots[1] > MaxOpSlot) MaxOpSlot = Slots[1];
+ NumOperands++;
+ } else if (const VANextInst *VANI = dyn_cast<VANextInst>(&I)) {
+ Slots[1] = Table.getSlot(VANI->getArgType());
+ assert(Slots[1] != -1 && "va_next return type unknown?");
+ if (Slots[1] > MaxOpSlot) MaxOpSlot = Slots[1];
+ NumOperands++;
+ } else if (const CallInst *CI = dyn_cast<CallInst>(&I)){// Handle VarArg calls
+ const PointerType *Ty = cast<PointerType>(CI->getCalledValue()->getType());
+ if (cast<FunctionType>(Ty->getElementType())->isVarArg()) {
+ outputInstrVarArgsCall(CI, Opcode, Table, Type, Out);
+ return;
+ }
+ } else if (const InvokeInst *II = dyn_cast<InvokeInst>(&I)) {// ... & Invokes
+ const PointerType *Ty = cast<PointerType>(II->getCalledValue()->getType());
+ if (cast<FunctionType>(Ty->getElementType())->isVarArg()) {
+ outputInstrVarArgsCall(II, Opcode, Table, Type, Out);
+ return;
+ }
+ }
+
+ ++NumInstrs;
// Decide which instruction encoding to use. This is determined primarily by
// the number of operands, and secondarily by whether or not the max operand
case 0:
case 1:
if (MaxOpSlot < (1 << 12)-1) { // -1 because we use 4095 to indicate 0 ops
- outputInstructionFormat1(I, Table, Slots, Type, Out);
- return false;
+ outputInstructionFormat1(&I, Opcode, Table, Slots, Type, Out);
+ return;
}
break;
case 2:
if (MaxOpSlot < (1 << 8)) {
- outputInstructionFormat2(I, Table, Slots, Type, Out);
- return false;
+ outputInstructionFormat2(&I, Opcode, Table, Slots, Type, Out);
+ return;
}
break;
case 3:
if (MaxOpSlot < (1 << 6)) {
- outputInstructionFormat3(I, Table, Slots, Type, Out);
- return false;
+ outputInstructionFormat3(&I, Opcode, Table, Slots, Type, Out);
+ return;
}
break;
}
- outputInstructionFormat0(I, Table, Type, Out);
- return false;
+ // If we weren't handled before here, we either have a large number of
+ // operands or a large operand index that we are referring to.
+ outputInstructionFormat0(&I, Opcode, Table, Type, Out);
}
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