1 //===-- Execution.cpp - Implement code to simulate the program ------------===//
3 // The LLVM Compiler Infrastructure
5 // This file was developed by the LLVM research group and is distributed under
6 // the University of Illinois Open Source License. See LICENSE.TXT for details.
8 //===----------------------------------------------------------------------===//
10 // This file contains the actual instruction interpreter.
12 //===----------------------------------------------------------------------===//
14 #include "Interpreter.h"
15 #include "llvm/Instructions.h"
16 #include "llvm/DerivedTypes.h"
17 #include "llvm/Constants.h"
18 #include "Support/Statistic.h"
19 #include <cmath> // For fmod
21 Interpreter *TheEE = 0;
24 Statistic<> NumDynamicInsts("lli", "Number of dynamic instructions executed");
27 //===----------------------------------------------------------------------===//
28 // Value Manipulation code
29 //===----------------------------------------------------------------------===//
31 // Operations used by constant expr implementations...
32 static GenericValue executeCastOperation(Value *Src, const Type *DestTy,
33 ExecutionContext &SF);
34 static GenericValue executeAddInst(GenericValue Src1, GenericValue Src2,
37 GenericValue Interpreter::getOperandValue(Value *V, ExecutionContext &SF) {
38 if (ConstantExpr *CE = dyn_cast<ConstantExpr>(V)) {
39 switch (CE->getOpcode()) {
40 case Instruction::Cast:
41 return executeCastOperation(CE->getOperand(0), CE->getType(), SF);
42 case Instruction::GetElementPtr:
43 return TheEE->executeGEPOperation(CE->getOperand(0), CE->op_begin()+1,
45 case Instruction::Add:
46 return executeAddInst(getOperandValue(CE->getOperand(0), SF),
47 getOperandValue(CE->getOperand(1), SF),
50 std::cerr << "Unhandled ConstantExpr: " << CE << "\n";
52 return GenericValue();
54 } else if (Constant *CPV = dyn_cast<Constant>(V)) {
55 return TheEE->getConstantValue(CPV);
56 } else if (GlobalValue *GV = dyn_cast<GlobalValue>(V)) {
57 return PTOGV(TheEE->getPointerToGlobal(GV));
63 static void SetValue(Value *V, GenericValue Val, ExecutionContext &SF) {
67 //===----------------------------------------------------------------------===//
68 // Annotation Wrangling code
69 //===----------------------------------------------------------------------===//
71 void Interpreter::initializeExecutionEngine() {
75 //===----------------------------------------------------------------------===//
76 // Binary Instruction Implementations
77 //===----------------------------------------------------------------------===//
79 #define IMPLEMENT_BINARY_OPERATOR(OP, TY) \
80 case Type::TY##TyID: Dest.TY##Val = Src1.TY##Val OP Src2.TY##Val; break
82 static GenericValue executeAddInst(GenericValue Src1, GenericValue Src2,
85 switch (Ty->getPrimitiveID()) {
86 IMPLEMENT_BINARY_OPERATOR(+, UByte);
87 IMPLEMENT_BINARY_OPERATOR(+, SByte);
88 IMPLEMENT_BINARY_OPERATOR(+, UShort);
89 IMPLEMENT_BINARY_OPERATOR(+, Short);
90 IMPLEMENT_BINARY_OPERATOR(+, UInt);
91 IMPLEMENT_BINARY_OPERATOR(+, Int);
92 IMPLEMENT_BINARY_OPERATOR(+, ULong);
93 IMPLEMENT_BINARY_OPERATOR(+, Long);
94 IMPLEMENT_BINARY_OPERATOR(+, Float);
95 IMPLEMENT_BINARY_OPERATOR(+, Double);
97 std::cout << "Unhandled type for Add instruction: " << *Ty << "\n";
103 static GenericValue executeSubInst(GenericValue Src1, GenericValue Src2,
106 switch (Ty->getPrimitiveID()) {
107 IMPLEMENT_BINARY_OPERATOR(-, UByte);
108 IMPLEMENT_BINARY_OPERATOR(-, SByte);
109 IMPLEMENT_BINARY_OPERATOR(-, UShort);
110 IMPLEMENT_BINARY_OPERATOR(-, Short);
111 IMPLEMENT_BINARY_OPERATOR(-, UInt);
112 IMPLEMENT_BINARY_OPERATOR(-, Int);
113 IMPLEMENT_BINARY_OPERATOR(-, ULong);
114 IMPLEMENT_BINARY_OPERATOR(-, Long);
115 IMPLEMENT_BINARY_OPERATOR(-, Float);
116 IMPLEMENT_BINARY_OPERATOR(-, Double);
118 std::cout << "Unhandled type for Sub instruction: " << *Ty << "\n";
124 static GenericValue executeMulInst(GenericValue Src1, GenericValue Src2,
127 switch (Ty->getPrimitiveID()) {
128 IMPLEMENT_BINARY_OPERATOR(*, UByte);
129 IMPLEMENT_BINARY_OPERATOR(*, SByte);
130 IMPLEMENT_BINARY_OPERATOR(*, UShort);
131 IMPLEMENT_BINARY_OPERATOR(*, Short);
132 IMPLEMENT_BINARY_OPERATOR(*, UInt);
133 IMPLEMENT_BINARY_OPERATOR(*, Int);
134 IMPLEMENT_BINARY_OPERATOR(*, ULong);
135 IMPLEMENT_BINARY_OPERATOR(*, Long);
136 IMPLEMENT_BINARY_OPERATOR(*, Float);
137 IMPLEMENT_BINARY_OPERATOR(*, Double);
139 std::cout << "Unhandled type for Mul instruction: " << Ty << "\n";
145 static GenericValue executeDivInst(GenericValue Src1, GenericValue Src2,
148 switch (Ty->getPrimitiveID()) {
149 IMPLEMENT_BINARY_OPERATOR(/, UByte);
150 IMPLEMENT_BINARY_OPERATOR(/, SByte);
151 IMPLEMENT_BINARY_OPERATOR(/, UShort);
152 IMPLEMENT_BINARY_OPERATOR(/, Short);
153 IMPLEMENT_BINARY_OPERATOR(/, UInt);
154 IMPLEMENT_BINARY_OPERATOR(/, Int);
155 IMPLEMENT_BINARY_OPERATOR(/, ULong);
156 IMPLEMENT_BINARY_OPERATOR(/, Long);
157 IMPLEMENT_BINARY_OPERATOR(/, Float);
158 IMPLEMENT_BINARY_OPERATOR(/, Double);
160 std::cout << "Unhandled type for Div instruction: " << *Ty << "\n";
166 static GenericValue executeRemInst(GenericValue Src1, GenericValue Src2,
169 switch (Ty->getPrimitiveID()) {
170 IMPLEMENT_BINARY_OPERATOR(%, UByte);
171 IMPLEMENT_BINARY_OPERATOR(%, SByte);
172 IMPLEMENT_BINARY_OPERATOR(%, UShort);
173 IMPLEMENT_BINARY_OPERATOR(%, Short);
174 IMPLEMENT_BINARY_OPERATOR(%, UInt);
175 IMPLEMENT_BINARY_OPERATOR(%, Int);
176 IMPLEMENT_BINARY_OPERATOR(%, ULong);
177 IMPLEMENT_BINARY_OPERATOR(%, Long);
178 case Type::FloatTyID:
179 Dest.FloatVal = fmod(Src1.FloatVal, Src2.FloatVal);
181 case Type::DoubleTyID:
182 Dest.DoubleVal = fmod(Src1.DoubleVal, Src2.DoubleVal);
185 std::cout << "Unhandled type for Rem instruction: " << *Ty << "\n";
191 static GenericValue executeAndInst(GenericValue Src1, GenericValue Src2,
194 switch (Ty->getPrimitiveID()) {
195 IMPLEMENT_BINARY_OPERATOR(&, Bool);
196 IMPLEMENT_BINARY_OPERATOR(&, UByte);
197 IMPLEMENT_BINARY_OPERATOR(&, SByte);
198 IMPLEMENT_BINARY_OPERATOR(&, UShort);
199 IMPLEMENT_BINARY_OPERATOR(&, Short);
200 IMPLEMENT_BINARY_OPERATOR(&, UInt);
201 IMPLEMENT_BINARY_OPERATOR(&, Int);
202 IMPLEMENT_BINARY_OPERATOR(&, ULong);
203 IMPLEMENT_BINARY_OPERATOR(&, Long);
205 std::cout << "Unhandled type for And instruction: " << *Ty << "\n";
211 static GenericValue executeOrInst(GenericValue Src1, GenericValue Src2,
214 switch (Ty->getPrimitiveID()) {
215 IMPLEMENT_BINARY_OPERATOR(|, Bool);
216 IMPLEMENT_BINARY_OPERATOR(|, UByte);
217 IMPLEMENT_BINARY_OPERATOR(|, SByte);
218 IMPLEMENT_BINARY_OPERATOR(|, UShort);
219 IMPLEMENT_BINARY_OPERATOR(|, Short);
220 IMPLEMENT_BINARY_OPERATOR(|, UInt);
221 IMPLEMENT_BINARY_OPERATOR(|, Int);
222 IMPLEMENT_BINARY_OPERATOR(|, ULong);
223 IMPLEMENT_BINARY_OPERATOR(|, Long);
225 std::cout << "Unhandled type for Or instruction: " << *Ty << "\n";
231 static GenericValue executeXorInst(GenericValue Src1, GenericValue Src2,
234 switch (Ty->getPrimitiveID()) {
235 IMPLEMENT_BINARY_OPERATOR(^, Bool);
236 IMPLEMENT_BINARY_OPERATOR(^, UByte);
237 IMPLEMENT_BINARY_OPERATOR(^, SByte);
238 IMPLEMENT_BINARY_OPERATOR(^, UShort);
239 IMPLEMENT_BINARY_OPERATOR(^, Short);
240 IMPLEMENT_BINARY_OPERATOR(^, UInt);
241 IMPLEMENT_BINARY_OPERATOR(^, Int);
242 IMPLEMENT_BINARY_OPERATOR(^, ULong);
243 IMPLEMENT_BINARY_OPERATOR(^, Long);
245 std::cout << "Unhandled type for Xor instruction: " << *Ty << "\n";
251 #define IMPLEMENT_SETCC(OP, TY) \
252 case Type::TY##TyID: Dest.BoolVal = Src1.TY##Val OP Src2.TY##Val; break
254 // Handle pointers specially because they must be compared with only as much
255 // width as the host has. We _do not_ want to be comparing 64 bit values when
256 // running on a 32-bit target, otherwise the upper 32 bits might mess up
257 // comparisons if they contain garbage.
258 #define IMPLEMENT_POINTERSETCC(OP) \
259 case Type::PointerTyID: \
260 Dest.BoolVal = (void*)(intptr_t)Src1.PointerVal OP \
261 (void*)(intptr_t)Src2.PointerVal; break
263 static GenericValue executeSetEQInst(GenericValue Src1, GenericValue Src2,
266 switch (Ty->getPrimitiveID()) {
267 IMPLEMENT_SETCC(==, UByte);
268 IMPLEMENT_SETCC(==, SByte);
269 IMPLEMENT_SETCC(==, UShort);
270 IMPLEMENT_SETCC(==, Short);
271 IMPLEMENT_SETCC(==, UInt);
272 IMPLEMENT_SETCC(==, Int);
273 IMPLEMENT_SETCC(==, ULong);
274 IMPLEMENT_SETCC(==, Long);
275 IMPLEMENT_SETCC(==, Float);
276 IMPLEMENT_SETCC(==, Double);
277 IMPLEMENT_POINTERSETCC(==);
279 std::cout << "Unhandled type for SetEQ instruction: " << *Ty << "\n";
285 static GenericValue executeSetNEInst(GenericValue Src1, GenericValue Src2,
288 switch (Ty->getPrimitiveID()) {
289 IMPLEMENT_SETCC(!=, UByte);
290 IMPLEMENT_SETCC(!=, SByte);
291 IMPLEMENT_SETCC(!=, UShort);
292 IMPLEMENT_SETCC(!=, Short);
293 IMPLEMENT_SETCC(!=, UInt);
294 IMPLEMENT_SETCC(!=, Int);
295 IMPLEMENT_SETCC(!=, ULong);
296 IMPLEMENT_SETCC(!=, Long);
297 IMPLEMENT_SETCC(!=, Float);
298 IMPLEMENT_SETCC(!=, Double);
299 IMPLEMENT_POINTERSETCC(!=);
302 std::cout << "Unhandled type for SetNE instruction: " << *Ty << "\n";
308 static GenericValue executeSetLEInst(GenericValue Src1, GenericValue Src2,
311 switch (Ty->getPrimitiveID()) {
312 IMPLEMENT_SETCC(<=, UByte);
313 IMPLEMENT_SETCC(<=, SByte);
314 IMPLEMENT_SETCC(<=, UShort);
315 IMPLEMENT_SETCC(<=, Short);
316 IMPLEMENT_SETCC(<=, UInt);
317 IMPLEMENT_SETCC(<=, Int);
318 IMPLEMENT_SETCC(<=, ULong);
319 IMPLEMENT_SETCC(<=, Long);
320 IMPLEMENT_SETCC(<=, Float);
321 IMPLEMENT_SETCC(<=, Double);
322 IMPLEMENT_POINTERSETCC(<=);
324 std::cout << "Unhandled type for SetLE instruction: " << Ty << "\n";
330 static GenericValue executeSetGEInst(GenericValue Src1, GenericValue Src2,
333 switch (Ty->getPrimitiveID()) {
334 IMPLEMENT_SETCC(>=, UByte);
335 IMPLEMENT_SETCC(>=, SByte);
336 IMPLEMENT_SETCC(>=, UShort);
337 IMPLEMENT_SETCC(>=, Short);
338 IMPLEMENT_SETCC(>=, UInt);
339 IMPLEMENT_SETCC(>=, Int);
340 IMPLEMENT_SETCC(>=, ULong);
341 IMPLEMENT_SETCC(>=, Long);
342 IMPLEMENT_SETCC(>=, Float);
343 IMPLEMENT_SETCC(>=, Double);
344 IMPLEMENT_POINTERSETCC(>=);
346 std::cout << "Unhandled type for SetGE instruction: " << *Ty << "\n";
352 static GenericValue executeSetLTInst(GenericValue Src1, GenericValue Src2,
355 switch (Ty->getPrimitiveID()) {
356 IMPLEMENT_SETCC(<, UByte);
357 IMPLEMENT_SETCC(<, SByte);
358 IMPLEMENT_SETCC(<, UShort);
359 IMPLEMENT_SETCC(<, Short);
360 IMPLEMENT_SETCC(<, UInt);
361 IMPLEMENT_SETCC(<, Int);
362 IMPLEMENT_SETCC(<, ULong);
363 IMPLEMENT_SETCC(<, Long);
364 IMPLEMENT_SETCC(<, Float);
365 IMPLEMENT_SETCC(<, Double);
366 IMPLEMENT_POINTERSETCC(<);
368 std::cout << "Unhandled type for SetLT instruction: " << *Ty << "\n";
374 static GenericValue executeSetGTInst(GenericValue Src1, GenericValue Src2,
377 switch (Ty->getPrimitiveID()) {
378 IMPLEMENT_SETCC(>, UByte);
379 IMPLEMENT_SETCC(>, SByte);
380 IMPLEMENT_SETCC(>, UShort);
381 IMPLEMENT_SETCC(>, Short);
382 IMPLEMENT_SETCC(>, UInt);
383 IMPLEMENT_SETCC(>, Int);
384 IMPLEMENT_SETCC(>, ULong);
385 IMPLEMENT_SETCC(>, Long);
386 IMPLEMENT_SETCC(>, Float);
387 IMPLEMENT_SETCC(>, Double);
388 IMPLEMENT_POINTERSETCC(>);
390 std::cout << "Unhandled type for SetGT instruction: " << *Ty << "\n";
396 void Interpreter::visitBinaryOperator(BinaryOperator &I) {
397 ExecutionContext &SF = ECStack.back();
398 const Type *Ty = I.getOperand(0)->getType();
399 GenericValue Src1 = getOperandValue(I.getOperand(0), SF);
400 GenericValue Src2 = getOperandValue(I.getOperand(1), SF);
401 GenericValue R; // Result
403 switch (I.getOpcode()) {
404 case Instruction::Add: R = executeAddInst (Src1, Src2, Ty); break;
405 case Instruction::Sub: R = executeSubInst (Src1, Src2, Ty); break;
406 case Instruction::Mul: R = executeMulInst (Src1, Src2, Ty); break;
407 case Instruction::Div: R = executeDivInst (Src1, Src2, Ty); break;
408 case Instruction::Rem: R = executeRemInst (Src1, Src2, Ty); break;
409 case Instruction::And: R = executeAndInst (Src1, Src2, Ty); break;
410 case Instruction::Or: R = executeOrInst (Src1, Src2, Ty); break;
411 case Instruction::Xor: R = executeXorInst (Src1, Src2, Ty); break;
412 case Instruction::SetEQ: R = executeSetEQInst(Src1, Src2, Ty); break;
413 case Instruction::SetNE: R = executeSetNEInst(Src1, Src2, Ty); break;
414 case Instruction::SetLE: R = executeSetLEInst(Src1, Src2, Ty); break;
415 case Instruction::SetGE: R = executeSetGEInst(Src1, Src2, Ty); break;
416 case Instruction::SetLT: R = executeSetLTInst(Src1, Src2, Ty); break;
417 case Instruction::SetGT: R = executeSetGTInst(Src1, Src2, Ty); break;
419 std::cout << "Don't know how to handle this binary operator!\n-->" << I;
426 //===----------------------------------------------------------------------===//
427 // Terminator Instruction Implementations
428 //===----------------------------------------------------------------------===//
430 void Interpreter::exitCalled(GenericValue GV) {
431 ExitCode = GV.SByteVal;
435 void Interpreter::visitReturnInst(ReturnInst &I) {
436 ExecutionContext &SF = ECStack.back();
437 const Type *RetTy = 0;
440 // Save away the return value... (if we are not 'ret void')
441 if (I.getNumOperands()) {
442 RetTy = I.getReturnValue()->getType();
443 Result = getOperandValue(I.getReturnValue(), SF);
446 // Pop the current stack frame... this invalidates SF
449 if (ECStack.empty()) { // Finished main. Put result into exit code...
450 if (RetTy && RetTy->isIntegral()) { // Nonvoid return type?
451 ExitCode = Result.IntVal; // Capture the exit code of the program
456 // If we have a previous stack frame, and we have a previous call,
457 // fill in the return value...
458 ExecutionContext &NewSF = ECStack.back();
460 if (NewSF.Caller->getType() != Type::VoidTy) // Save result...
461 SetValue(NewSF.Caller, Result, NewSF);
462 NewSF.Caller = 0; // We returned from the call...
467 void Interpreter::visitBranchInst(BranchInst &I) {
468 ExecutionContext &SF = ECStack.back();
471 Dest = I.getSuccessor(0); // Uncond branches have a fixed dest...
472 if (!I.isUnconditional()) {
473 Value *Cond = I.getCondition();
474 if (getOperandValue(Cond, SF).BoolVal == 0) // If false cond...
475 Dest = I.getSuccessor(1);
477 SwitchToNewBasicBlock(Dest, SF);
480 void Interpreter::visitSwitchInst(SwitchInst &I) {
481 ExecutionContext &SF = ECStack.back();
482 GenericValue CondVal = getOperandValue(I.getOperand(0), SF);
483 const Type *ElTy = I.getOperand(0)->getType();
485 // Check to see if any of the cases match...
486 BasicBlock *Dest = 0;
487 for (unsigned i = 2, e = I.getNumOperands(); i != e; i += 2)
488 if (executeSetEQInst(CondVal,
489 getOperandValue(I.getOperand(i), SF), ElTy).BoolVal) {
490 Dest = cast<BasicBlock>(I.getOperand(i+1));
494 if (!Dest) Dest = I.getDefaultDest(); // No cases matched: use default
495 SwitchToNewBasicBlock(Dest, SF);
498 // SwitchToNewBasicBlock - This method is used to jump to a new basic block.
499 // This function handles the actual updating of block and instruction iterators
500 // as well as execution of all of the PHI nodes in the destination block.
502 // This method does this because all of the PHI nodes must be executed
503 // atomically, reading their inputs before any of the results are updated. Not
504 // doing this can cause problems if the PHI nodes depend on other PHI nodes for
505 // their inputs. If the input PHI node is updated before it is read, incorrect
506 // results can happen. Thus we use a two phase approach.
508 void Interpreter::SwitchToNewBasicBlock(BasicBlock *Dest, ExecutionContext &SF){
509 BasicBlock *PrevBB = SF.CurBB; // Remember where we came from...
510 SF.CurBB = Dest; // Update CurBB to branch destination
511 SF.CurInst = SF.CurBB->begin(); // Update new instruction ptr...
513 if (!isa<PHINode>(SF.CurInst)) return; // Nothing fancy to do
515 // Loop over all of the PHI nodes in the current block, reading their inputs.
516 std::vector<GenericValue> ResultValues;
518 for (; PHINode *PN = dyn_cast<PHINode>(SF.CurInst); ++SF.CurInst) {
519 // Search for the value corresponding to this previous bb...
520 int i = PN->getBasicBlockIndex(PrevBB);
521 assert(i != -1 && "PHINode doesn't contain entry for predecessor??");
522 Value *IncomingValue = PN->getIncomingValue(i);
524 // Save the incoming value for this PHI node...
525 ResultValues.push_back(getOperandValue(IncomingValue, SF));
528 // Now loop over all of the PHI nodes setting their values...
529 SF.CurInst = SF.CurBB->begin();
530 for (unsigned i = 0; PHINode *PN = dyn_cast<PHINode>(SF.CurInst);
532 SetValue(PN, ResultValues[i], SF);
535 //===----------------------------------------------------------------------===//
536 // Memory Instruction Implementations
537 //===----------------------------------------------------------------------===//
539 void Interpreter::visitAllocationInst(AllocationInst &I) {
540 ExecutionContext &SF = ECStack.back();
542 const Type *Ty = I.getType()->getElementType(); // Type to be allocated
544 // Get the number of elements being allocated by the array...
545 unsigned NumElements = getOperandValue(I.getOperand(0), SF).UIntVal;
547 // Allocate enough memory to hold the type...
548 void *Memory = malloc(NumElements * TD.getTypeSize(Ty));
550 GenericValue Result = PTOGV(Memory);
551 assert(Result.PointerVal != 0 && "Null pointer returned by malloc!");
552 SetValue(&I, Result, SF);
554 if (I.getOpcode() == Instruction::Alloca)
555 ECStack.back().Allocas.add(Memory);
558 void Interpreter::visitFreeInst(FreeInst &I) {
559 ExecutionContext &SF = ECStack.back();
560 assert(isa<PointerType>(I.getOperand(0)->getType()) && "Freeing nonptr?");
561 GenericValue Value = getOperandValue(I.getOperand(0), SF);
562 // TODO: Check to make sure memory is allocated
563 free(GVTOP(Value)); // Free memory
566 // getElementOffset - The workhorse for getelementptr.
568 GenericValue Interpreter::executeGEPOperation(Value *Ptr, User::op_iterator I,
570 ExecutionContext &SF) {
571 assert(isa<PointerType>(Ptr->getType()) &&
572 "Cannot getElementOffset of a nonpointer type!");
575 const Type *Ty = Ptr->getType();
577 for (; I != E; ++I) {
578 if (const StructType *STy = dyn_cast<StructType>(Ty)) {
579 const StructLayout *SLO = TD.getStructLayout(STy);
581 // Indices must be ubyte constants...
582 const ConstantUInt *CPU = cast<ConstantUInt>(*I);
583 assert(CPU->getType() == Type::UByteTy);
584 unsigned Index = CPU->getValue();
586 Total += SLO->MemberOffsets[Index];
587 Ty = STy->getElementTypes()[Index];
588 } else if (const SequentialType *ST = cast<SequentialType>(Ty)) {
589 // Get the index number for the array... which must be long type...
590 assert((*I)->getType() == Type::LongTy);
591 unsigned Idx = getOperandValue(*I, SF).LongVal;
592 Ty = ST->getElementType();
593 unsigned Size = TD.getTypeSize(Ty);
599 Result.PointerVal = getOperandValue(Ptr, SF).PointerVal + Total;
603 void Interpreter::visitGetElementPtrInst(GetElementPtrInst &I) {
604 ExecutionContext &SF = ECStack.back();
605 SetValue(&I, TheEE->executeGEPOperation(I.getPointerOperand(),
606 I.idx_begin(), I.idx_end(), SF), SF);
609 void Interpreter::visitLoadInst(LoadInst &I) {
610 ExecutionContext &SF = ECStack.back();
611 GenericValue SRC = getOperandValue(I.getPointerOperand(), SF);
612 GenericValue *Ptr = (GenericValue*)GVTOP(SRC);
613 GenericValue Result = LoadValueFromMemory(Ptr, I.getType());
614 SetValue(&I, Result, SF);
617 void Interpreter::visitStoreInst(StoreInst &I) {
618 ExecutionContext &SF = ECStack.back();
619 GenericValue Val = getOperandValue(I.getOperand(0), SF);
620 GenericValue SRC = getOperandValue(I.getPointerOperand(), SF);
621 StoreValueToMemory(Val, (GenericValue *)GVTOP(SRC),
622 I.getOperand(0)->getType());
625 //===----------------------------------------------------------------------===//
626 // Miscellaneous Instruction Implementations
627 //===----------------------------------------------------------------------===//
629 void Interpreter::visitCallInst(CallInst &I) {
630 ExecutionContext &SF = ECStack.back();
632 std::vector<GenericValue> ArgVals;
633 ArgVals.reserve(I.getNumOperands()-1);
634 for (unsigned i = 1; i < I.getNumOperands(); ++i) {
635 ArgVals.push_back(getOperandValue(I.getOperand(i), SF));
636 // Promote all integral types whose size is < sizeof(int) into ints. We do
637 // this by zero or sign extending the value as appropriate according to the
639 if (I.getOperand(i)->getType()->isIntegral() &&
640 I.getOperand(i)->getType()->getPrimitiveSize() < 4) {
641 const Type *Ty = I.getOperand(i)->getType();
642 if (Ty == Type::ShortTy)
643 ArgVals.back().IntVal = ArgVals.back().ShortVal;
644 else if (Ty == Type::UShortTy)
645 ArgVals.back().UIntVal = ArgVals.back().UShortVal;
646 else if (Ty == Type::SByteTy)
647 ArgVals.back().IntVal = ArgVals.back().SByteVal;
648 else if (Ty == Type::UByteTy)
649 ArgVals.back().UIntVal = ArgVals.back().UByteVal;
650 else if (Ty == Type::BoolTy)
651 ArgVals.back().UIntVal = ArgVals.back().BoolVal;
653 assert(0 && "Unknown type!");
657 // To handle indirect calls, we must get the pointer value from the argument
658 // and treat it as a function pointer.
659 GenericValue SRC = getOperandValue(I.getCalledValue(), SF);
660 callFunction((Function*)GVTOP(SRC), ArgVals);
663 #define IMPLEMENT_SHIFT(OP, TY) \
664 case Type::TY##TyID: Dest.TY##Val = Src1.TY##Val OP Src2.UByteVal; break
666 void Interpreter::visitShl(ShiftInst &I) {
667 ExecutionContext &SF = ECStack.back();
668 const Type *Ty = I.getOperand(0)->getType();
669 GenericValue Src1 = getOperandValue(I.getOperand(0), SF);
670 GenericValue Src2 = getOperandValue(I.getOperand(1), SF);
673 switch (Ty->getPrimitiveID()) {
674 IMPLEMENT_SHIFT(<<, UByte);
675 IMPLEMENT_SHIFT(<<, SByte);
676 IMPLEMENT_SHIFT(<<, UShort);
677 IMPLEMENT_SHIFT(<<, Short);
678 IMPLEMENT_SHIFT(<<, UInt);
679 IMPLEMENT_SHIFT(<<, Int);
680 IMPLEMENT_SHIFT(<<, ULong);
681 IMPLEMENT_SHIFT(<<, Long);
683 std::cout << "Unhandled type for Shl instruction: " << *Ty << "\n";
685 SetValue(&I, Dest, SF);
688 void Interpreter::visitShr(ShiftInst &I) {
689 ExecutionContext &SF = ECStack.back();
690 const Type *Ty = I.getOperand(0)->getType();
691 GenericValue Src1 = getOperandValue(I.getOperand(0), SF);
692 GenericValue Src2 = getOperandValue(I.getOperand(1), SF);
695 switch (Ty->getPrimitiveID()) {
696 IMPLEMENT_SHIFT(>>, UByte);
697 IMPLEMENT_SHIFT(>>, SByte);
698 IMPLEMENT_SHIFT(>>, UShort);
699 IMPLEMENT_SHIFT(>>, Short);
700 IMPLEMENT_SHIFT(>>, UInt);
701 IMPLEMENT_SHIFT(>>, Int);
702 IMPLEMENT_SHIFT(>>, ULong);
703 IMPLEMENT_SHIFT(>>, Long);
705 std::cout << "Unhandled type for Shr instruction: " << *Ty << "\n";
708 SetValue(&I, Dest, SF);
711 #define IMPLEMENT_CAST(DTY, DCTY, STY) \
712 case Type::STY##TyID: Dest.DTY##Val = DCTY Src.STY##Val; break;
714 #define IMPLEMENT_CAST_CASE_START(DESTTY, DESTCTY) \
715 case Type::DESTTY##TyID: \
716 switch (SrcTy->getPrimitiveID()) { \
717 IMPLEMENT_CAST(DESTTY, DESTCTY, Bool); \
718 IMPLEMENT_CAST(DESTTY, DESTCTY, UByte); \
719 IMPLEMENT_CAST(DESTTY, DESTCTY, SByte); \
720 IMPLEMENT_CAST(DESTTY, DESTCTY, UShort); \
721 IMPLEMENT_CAST(DESTTY, DESTCTY, Short); \
722 IMPLEMENT_CAST(DESTTY, DESTCTY, UInt); \
723 IMPLEMENT_CAST(DESTTY, DESTCTY, Int); \
724 IMPLEMENT_CAST(DESTTY, DESTCTY, ULong); \
725 IMPLEMENT_CAST(DESTTY, DESTCTY, Long); \
726 IMPLEMENT_CAST(DESTTY, DESTCTY, Pointer);
728 #define IMPLEMENT_CAST_CASE_FP_IMP(DESTTY, DESTCTY) \
729 IMPLEMENT_CAST(DESTTY, DESTCTY, Float); \
730 IMPLEMENT_CAST(DESTTY, DESTCTY, Double)
732 #define IMPLEMENT_CAST_CASE_END() \
733 default: std::cout << "Unhandled cast: " << SrcTy << " to " << Ty << "\n"; \
738 #define IMPLEMENT_CAST_CASE(DESTTY, DESTCTY) \
739 IMPLEMENT_CAST_CASE_START(DESTTY, DESTCTY); \
740 IMPLEMENT_CAST_CASE_FP_IMP(DESTTY, DESTCTY); \
741 IMPLEMENT_CAST_CASE_END()
743 GenericValue Interpreter::executeCastOperation(Value *SrcVal, const Type *Ty,
744 ExecutionContext &SF) {
745 const Type *SrcTy = SrcVal->getType();
746 GenericValue Dest, Src = getOperandValue(SrcVal, SF);
748 switch (Ty->getPrimitiveID()) {
749 IMPLEMENT_CAST_CASE(UByte , (unsigned char));
750 IMPLEMENT_CAST_CASE(SByte , ( signed char));
751 IMPLEMENT_CAST_CASE(UShort , (unsigned short));
752 IMPLEMENT_CAST_CASE(Short , ( signed short));
753 IMPLEMENT_CAST_CASE(UInt , (unsigned int ));
754 IMPLEMENT_CAST_CASE(Int , ( signed int ));
755 IMPLEMENT_CAST_CASE(ULong , (uint64_t));
756 IMPLEMENT_CAST_CASE(Long , ( int64_t));
757 IMPLEMENT_CAST_CASE(Pointer, (PointerTy));
758 IMPLEMENT_CAST_CASE(Float , (float));
759 IMPLEMENT_CAST_CASE(Double , (double));
760 IMPLEMENT_CAST_CASE(Bool , (bool));
762 std::cout << "Unhandled dest type for cast instruction: " << *Ty << "\n";
769 void Interpreter::visitCastInst(CastInst &I) {
770 ExecutionContext &SF = ECStack.back();
771 SetValue(&I, executeCastOperation(I.getOperand(0), I.getType(), SF), SF);
774 void Interpreter::visitVANextInst(VANextInst &I) {
775 ExecutionContext &SF = ECStack.back();
777 // Get the incoming valist element. LLI treats the valist as an integer.
778 GenericValue VAList = getOperandValue(I.getOperand(0), SF);
780 // Move to the next operand.
781 unsigned Argument = VAList.IntVal++;
782 assert(Argument < SF.VarArgs.size() &&
783 "Accessing past the last vararg argument!");
784 SetValue(&I, VAList, SF);
787 //===----------------------------------------------------------------------===//
788 // Dispatch and Execution Code
789 //===----------------------------------------------------------------------===//
791 //===----------------------------------------------------------------------===//
792 // callFunction - Execute the specified function...
794 void Interpreter::callFunction(Function *F,
795 const std::vector<GenericValue> &ArgVals) {
796 assert((ECStack.empty() || ECStack.back().Caller == 0 ||
797 ECStack.back().Caller->getNumOperands()-1 == ArgVals.size()) &&
798 "Incorrect number of arguments passed into function call!");
799 if (F->isExternal()) {
800 GenericValue Result = callExternalFunction(F, ArgVals);
801 const Type *RetTy = F->getReturnType();
803 // Copy the result back into the result variable if we are not returning
805 if (RetTy != Type::VoidTy) {
806 if (!ECStack.empty() && ECStack.back().Caller) {
807 ExecutionContext &SF = ECStack.back();
808 SetValue(SF.Caller, Result, SF);
809 SF.Caller = 0; // We returned from the call...
816 // Make a new stack frame... and fill it in.
817 ECStack.push_back(ExecutionContext());
818 ExecutionContext &StackFrame = ECStack.back();
819 StackFrame.CurFunction = F;
820 StackFrame.CurBB = F->begin();
821 StackFrame.CurInst = StackFrame.CurBB->begin();
823 // Run through the function arguments and initialize their values...
824 assert((ArgVals.size() == F->asize() ||
825 (ArgVals.size() > F->asize() && F->getFunctionType()->isVarArg())) &&
826 "Invalid number of values passed to function invocation!");
828 // Handle non-varargs arguments...
830 for (Function::aiterator AI = F->abegin(), E = F->aend(); AI != E; ++AI, ++i)
831 SetValue(AI, ArgVals[i], StackFrame);
833 // Handle varargs arguments...
834 StackFrame.VarArgs.assign(ArgVals.begin()+i, ArgVals.end());
837 void Interpreter::run() {
838 while (!ECStack.empty()) {
839 // Interpret a single instruction & increment the "PC".
840 ExecutionContext &SF = ECStack.back(); // Current stack frame
841 Instruction &I = *SF.CurInst++; // Increment before execute
843 // Track the number of dynamic instructions executed.
846 visit(I); // Dispatch to one of the visit* methods...