1 //===-- Execution.cpp - Implement code to simulate the program ------------===//
3 // The LLVM Compiler Infrastructure
5 // This file is distributed under the University of Illinois Open Source
6 // License. See LICENSE.TXT for details.
8 //===----------------------------------------------------------------------===//
10 // This file contains the actual instruction interpreter.
12 //===----------------------------------------------------------------------===//
14 #define DEBUG_TYPE "interpreter"
15 #include "Interpreter.h"
16 #include "llvm/Constants.h"
17 #include "llvm/DerivedTypes.h"
18 #include "llvm/Instructions.h"
19 #include "llvm/ParameterAttributes.h"
20 #include "llvm/CodeGen/IntrinsicLowering.h"
21 #include "llvm/Support/GetElementPtrTypeIterator.h"
22 #include "llvm/ADT/APInt.h"
23 #include "llvm/ADT/Statistic.h"
24 #include "llvm/Support/Debug.h"
25 #include "llvm/Support/MathExtras.h"
31 STATISTIC(NumDynamicInsts, "Number of dynamic instructions executed");
32 static Interpreter *TheEE = 0;
34 //===----------------------------------------------------------------------===//
35 // Various Helper Functions
36 //===----------------------------------------------------------------------===//
38 static inline uint64_t doSignExtension(uint64_t Val, const IntegerType* ITy) {
39 // Determine if the value is signed or not
40 bool isSigned = (Val & (1 << (ITy->getBitWidth()-1))) != 0;
41 // If its signed, extend the sign bits
43 Val |= ~ITy->getBitMask();
47 static void SetValue(Value *V, GenericValue Val, ExecutionContext &SF) {
51 void Interpreter::initializeExecutionEngine() {
55 //===----------------------------------------------------------------------===//
56 // Binary Instruction Implementations
57 //===----------------------------------------------------------------------===//
59 #define IMPLEMENT_BINARY_OPERATOR(OP, TY) \
60 case Type::TY##TyID: \
61 Dest.TY##Val = Src1.TY##Val OP Src2.TY##Val; \
64 #define IMPLEMENT_INTEGER_BINOP1(OP, TY) \
65 case Type::IntegerTyID: { \
66 Dest.IntVal = Src1.IntVal OP Src2.IntVal; \
71 static void executeAddInst(GenericValue &Dest, GenericValue Src1,
72 GenericValue Src2, const Type *Ty) {
73 switch (Ty->getTypeID()) {
74 IMPLEMENT_INTEGER_BINOP1(+, Ty);
75 IMPLEMENT_BINARY_OPERATOR(+, Float);
76 IMPLEMENT_BINARY_OPERATOR(+, Double);
78 cerr << "Unhandled type for Add instruction: " << *Ty << "\n";
83 static void executeSubInst(GenericValue &Dest, GenericValue Src1,
84 GenericValue Src2, const Type *Ty) {
85 switch (Ty->getTypeID()) {
86 IMPLEMENT_INTEGER_BINOP1(-, Ty);
87 IMPLEMENT_BINARY_OPERATOR(-, Float);
88 IMPLEMENT_BINARY_OPERATOR(-, Double);
90 cerr << "Unhandled type for Sub instruction: " << *Ty << "\n";
95 static void executeMulInst(GenericValue &Dest, GenericValue Src1,
96 GenericValue Src2, const Type *Ty) {
97 switch (Ty->getTypeID()) {
98 IMPLEMENT_INTEGER_BINOP1(*, Ty);
99 IMPLEMENT_BINARY_OPERATOR(*, Float);
100 IMPLEMENT_BINARY_OPERATOR(*, Double);
102 cerr << "Unhandled type for Mul instruction: " << *Ty << "\n";
107 static void executeFDivInst(GenericValue &Dest, GenericValue Src1,
108 GenericValue Src2, const Type *Ty) {
109 switch (Ty->getTypeID()) {
110 IMPLEMENT_BINARY_OPERATOR(/, Float);
111 IMPLEMENT_BINARY_OPERATOR(/, Double);
113 cerr << "Unhandled type for FDiv instruction: " << *Ty << "\n";
118 static void executeFRemInst(GenericValue &Dest, GenericValue Src1,
119 GenericValue Src2, const Type *Ty) {
120 switch (Ty->getTypeID()) {
121 case Type::FloatTyID:
122 Dest.FloatVal = fmod(Src1.FloatVal, Src2.FloatVal);
124 case Type::DoubleTyID:
125 Dest.DoubleVal = fmod(Src1.DoubleVal, Src2.DoubleVal);
128 cerr << "Unhandled type for Rem instruction: " << *Ty << "\n";
133 #define IMPLEMENT_INTEGER_ICMP(OP, TY) \
134 case Type::IntegerTyID: \
135 Dest.IntVal = APInt(1,Src1.IntVal.OP(Src2.IntVal)); \
138 // Handle pointers specially because they must be compared with only as much
139 // width as the host has. We _do not_ want to be comparing 64 bit values when
140 // running on a 32-bit target, otherwise the upper 32 bits might mess up
141 // comparisons if they contain garbage.
142 #define IMPLEMENT_POINTER_ICMP(OP) \
143 case Type::PointerTyID: \
144 Dest.IntVal = APInt(1,(void*)(intptr_t)Src1.PointerVal OP \
145 (void*)(intptr_t)Src2.PointerVal); \
148 static GenericValue executeICMP_EQ(GenericValue Src1, GenericValue Src2,
151 switch (Ty->getTypeID()) {
152 IMPLEMENT_INTEGER_ICMP(eq,Ty);
153 IMPLEMENT_POINTER_ICMP(==);
155 cerr << "Unhandled type for ICMP_EQ predicate: " << *Ty << "\n";
161 static GenericValue executeICMP_NE(GenericValue Src1, GenericValue Src2,
164 switch (Ty->getTypeID()) {
165 IMPLEMENT_INTEGER_ICMP(ne,Ty);
166 IMPLEMENT_POINTER_ICMP(!=);
168 cerr << "Unhandled type for ICMP_NE predicate: " << *Ty << "\n";
174 static GenericValue executeICMP_ULT(GenericValue Src1, GenericValue Src2,
177 switch (Ty->getTypeID()) {
178 IMPLEMENT_INTEGER_ICMP(ult,Ty);
179 IMPLEMENT_POINTER_ICMP(<);
181 cerr << "Unhandled type for ICMP_ULT predicate: " << *Ty << "\n";
187 static GenericValue executeICMP_SLT(GenericValue Src1, GenericValue Src2,
190 switch (Ty->getTypeID()) {
191 IMPLEMENT_INTEGER_ICMP(slt,Ty);
192 IMPLEMENT_POINTER_ICMP(<);
194 cerr << "Unhandled type for ICMP_SLT predicate: " << *Ty << "\n";
200 static GenericValue executeICMP_UGT(GenericValue Src1, GenericValue Src2,
203 switch (Ty->getTypeID()) {
204 IMPLEMENT_INTEGER_ICMP(ugt,Ty);
205 IMPLEMENT_POINTER_ICMP(>);
207 cerr << "Unhandled type for ICMP_UGT predicate: " << *Ty << "\n";
213 static GenericValue executeICMP_SGT(GenericValue Src1, GenericValue Src2,
216 switch (Ty->getTypeID()) {
217 IMPLEMENT_INTEGER_ICMP(sgt,Ty);
218 IMPLEMENT_POINTER_ICMP(>);
220 cerr << "Unhandled type for ICMP_SGT predicate: " << *Ty << "\n";
226 static GenericValue executeICMP_ULE(GenericValue Src1, GenericValue Src2,
229 switch (Ty->getTypeID()) {
230 IMPLEMENT_INTEGER_ICMP(ule,Ty);
231 IMPLEMENT_POINTER_ICMP(<=);
233 cerr << "Unhandled type for ICMP_ULE predicate: " << *Ty << "\n";
239 static GenericValue executeICMP_SLE(GenericValue Src1, GenericValue Src2,
242 switch (Ty->getTypeID()) {
243 IMPLEMENT_INTEGER_ICMP(sle,Ty);
244 IMPLEMENT_POINTER_ICMP(<=);
246 cerr << "Unhandled type for ICMP_SLE predicate: " << *Ty << "\n";
252 static GenericValue executeICMP_UGE(GenericValue Src1, GenericValue Src2,
255 switch (Ty->getTypeID()) {
256 IMPLEMENT_INTEGER_ICMP(uge,Ty);
257 IMPLEMENT_POINTER_ICMP(>=);
259 cerr << "Unhandled type for ICMP_UGE predicate: " << *Ty << "\n";
265 static GenericValue executeICMP_SGE(GenericValue Src1, GenericValue Src2,
268 switch (Ty->getTypeID()) {
269 IMPLEMENT_INTEGER_ICMP(sge,Ty);
270 IMPLEMENT_POINTER_ICMP(>=);
272 cerr << "Unhandled type for ICMP_SGE predicate: " << *Ty << "\n";
278 void Interpreter::visitICmpInst(ICmpInst &I) {
279 ExecutionContext &SF = ECStack.back();
280 const Type *Ty = I.getOperand(0)->getType();
281 GenericValue Src1 = getOperandValue(I.getOperand(0), SF);
282 GenericValue Src2 = getOperandValue(I.getOperand(1), SF);
283 GenericValue R; // Result
285 switch (I.getPredicate()) {
286 case ICmpInst::ICMP_EQ: R = executeICMP_EQ(Src1, Src2, Ty); break;
287 case ICmpInst::ICMP_NE: R = executeICMP_NE(Src1, Src2, Ty); break;
288 case ICmpInst::ICMP_ULT: R = executeICMP_ULT(Src1, Src2, Ty); break;
289 case ICmpInst::ICMP_SLT: R = executeICMP_SLT(Src1, Src2, Ty); break;
290 case ICmpInst::ICMP_UGT: R = executeICMP_UGT(Src1, Src2, Ty); break;
291 case ICmpInst::ICMP_SGT: R = executeICMP_SGT(Src1, Src2, Ty); break;
292 case ICmpInst::ICMP_ULE: R = executeICMP_ULE(Src1, Src2, Ty); break;
293 case ICmpInst::ICMP_SLE: R = executeICMP_SLE(Src1, Src2, Ty); break;
294 case ICmpInst::ICMP_UGE: R = executeICMP_UGE(Src1, Src2, Ty); break;
295 case ICmpInst::ICMP_SGE: R = executeICMP_SGE(Src1, Src2, Ty); break;
297 cerr << "Don't know how to handle this ICmp predicate!\n-->" << I;
304 #define IMPLEMENT_FCMP(OP, TY) \
305 case Type::TY##TyID: \
306 Dest.IntVal = APInt(1,Src1.TY##Val OP Src2.TY##Val); \
309 static GenericValue executeFCMP_OEQ(GenericValue Src1, GenericValue Src2,
312 switch (Ty->getTypeID()) {
313 IMPLEMENT_FCMP(==, Float);
314 IMPLEMENT_FCMP(==, Double);
316 cerr << "Unhandled type for FCmp EQ instruction: " << *Ty << "\n";
322 static GenericValue executeFCMP_ONE(GenericValue Src1, GenericValue Src2,
325 switch (Ty->getTypeID()) {
326 IMPLEMENT_FCMP(!=, Float);
327 IMPLEMENT_FCMP(!=, Double);
330 cerr << "Unhandled type for FCmp NE instruction: " << *Ty << "\n";
336 static GenericValue executeFCMP_OLE(GenericValue Src1, GenericValue Src2,
339 switch (Ty->getTypeID()) {
340 IMPLEMENT_FCMP(<=, Float);
341 IMPLEMENT_FCMP(<=, Double);
343 cerr << "Unhandled type for FCmp LE instruction: " << *Ty << "\n";
349 static GenericValue executeFCMP_OGE(GenericValue Src1, GenericValue Src2,
352 switch (Ty->getTypeID()) {
353 IMPLEMENT_FCMP(>=, Float);
354 IMPLEMENT_FCMP(>=, Double);
356 cerr << "Unhandled type for FCmp GE instruction: " << *Ty << "\n";
362 static GenericValue executeFCMP_OLT(GenericValue Src1, GenericValue Src2,
365 switch (Ty->getTypeID()) {
366 IMPLEMENT_FCMP(<, Float);
367 IMPLEMENT_FCMP(<, Double);
369 cerr << "Unhandled type for FCmp LT instruction: " << *Ty << "\n";
375 static GenericValue executeFCMP_OGT(GenericValue Src1, GenericValue Src2,
378 switch (Ty->getTypeID()) {
379 IMPLEMENT_FCMP(>, Float);
380 IMPLEMENT_FCMP(>, Double);
382 cerr << "Unhandled type for FCmp GT instruction: " << *Ty << "\n";
388 #define IMPLEMENT_UNORDERED(TY, X,Y) \
389 if (TY == Type::FloatTy) { \
390 if (X.FloatVal != X.FloatVal || Y.FloatVal != Y.FloatVal) { \
391 Dest.IntVal = APInt(1,true); \
394 } else if (X.DoubleVal != X.DoubleVal || Y.DoubleVal != Y.DoubleVal) { \
395 Dest.IntVal = APInt(1,true); \
400 static GenericValue executeFCMP_UEQ(GenericValue Src1, GenericValue Src2,
403 IMPLEMENT_UNORDERED(Ty, Src1, Src2)
404 return executeFCMP_OEQ(Src1, Src2, Ty);
407 static GenericValue executeFCMP_UNE(GenericValue Src1, GenericValue Src2,
410 IMPLEMENT_UNORDERED(Ty, Src1, Src2)
411 return executeFCMP_ONE(Src1, Src2, Ty);
414 static GenericValue executeFCMP_ULE(GenericValue Src1, GenericValue Src2,
417 IMPLEMENT_UNORDERED(Ty, Src1, Src2)
418 return executeFCMP_OLE(Src1, Src2, Ty);
421 static GenericValue executeFCMP_UGE(GenericValue Src1, GenericValue Src2,
424 IMPLEMENT_UNORDERED(Ty, Src1, Src2)
425 return executeFCMP_OGE(Src1, Src2, Ty);
428 static GenericValue executeFCMP_ULT(GenericValue Src1, GenericValue Src2,
431 IMPLEMENT_UNORDERED(Ty, Src1, Src2)
432 return executeFCMP_OLT(Src1, Src2, Ty);
435 static GenericValue executeFCMP_UGT(GenericValue Src1, GenericValue Src2,
438 IMPLEMENT_UNORDERED(Ty, Src1, Src2)
439 return executeFCMP_OGT(Src1, Src2, Ty);
442 static GenericValue executeFCMP_ORD(GenericValue Src1, GenericValue Src2,
445 if (Ty == Type::FloatTy)
446 Dest.IntVal = APInt(1,(Src1.FloatVal == Src1.FloatVal &&
447 Src2.FloatVal == Src2.FloatVal));
449 Dest.IntVal = APInt(1,(Src1.DoubleVal == Src1.DoubleVal &&
450 Src2.DoubleVal == Src2.DoubleVal));
454 static GenericValue executeFCMP_UNO(GenericValue Src1, GenericValue Src2,
457 if (Ty == Type::FloatTy)
458 Dest.IntVal = APInt(1,(Src1.FloatVal != Src1.FloatVal ||
459 Src2.FloatVal != Src2.FloatVal));
461 Dest.IntVal = APInt(1,(Src1.DoubleVal != Src1.DoubleVal ||
462 Src2.DoubleVal != Src2.DoubleVal));
466 void Interpreter::visitFCmpInst(FCmpInst &I) {
467 ExecutionContext &SF = ECStack.back();
468 const Type *Ty = I.getOperand(0)->getType();
469 GenericValue Src1 = getOperandValue(I.getOperand(0), SF);
470 GenericValue Src2 = getOperandValue(I.getOperand(1), SF);
471 GenericValue R; // Result
473 switch (I.getPredicate()) {
474 case FCmpInst::FCMP_FALSE: R.IntVal = APInt(1,false); break;
475 case FCmpInst::FCMP_TRUE: R.IntVal = APInt(1,true); break;
476 case FCmpInst::FCMP_ORD: R = executeFCMP_ORD(Src1, Src2, Ty); break;
477 case FCmpInst::FCMP_UNO: R = executeFCMP_UNO(Src1, Src2, Ty); break;
478 case FCmpInst::FCMP_UEQ: R = executeFCMP_UEQ(Src1, Src2, Ty); break;
479 case FCmpInst::FCMP_OEQ: R = executeFCMP_OEQ(Src1, Src2, Ty); break;
480 case FCmpInst::FCMP_UNE: R = executeFCMP_UNE(Src1, Src2, Ty); break;
481 case FCmpInst::FCMP_ONE: R = executeFCMP_ONE(Src1, Src2, Ty); break;
482 case FCmpInst::FCMP_ULT: R = executeFCMP_ULT(Src1, Src2, Ty); break;
483 case FCmpInst::FCMP_OLT: R = executeFCMP_OLT(Src1, Src2, Ty); break;
484 case FCmpInst::FCMP_UGT: R = executeFCMP_UGT(Src1, Src2, Ty); break;
485 case FCmpInst::FCMP_OGT: R = executeFCMP_OGT(Src1, Src2, Ty); break;
486 case FCmpInst::FCMP_ULE: R = executeFCMP_ULE(Src1, Src2, Ty); break;
487 case FCmpInst::FCMP_OLE: R = executeFCMP_OLE(Src1, Src2, Ty); break;
488 case FCmpInst::FCMP_UGE: R = executeFCMP_UGE(Src1, Src2, Ty); break;
489 case FCmpInst::FCMP_OGE: R = executeFCMP_OGE(Src1, Src2, Ty); break;
491 cerr << "Don't know how to handle this FCmp predicate!\n-->" << I;
498 static GenericValue executeCmpInst(unsigned predicate, GenericValue Src1,
499 GenericValue Src2, const Type *Ty) {
502 case ICmpInst::ICMP_EQ: return executeICMP_EQ(Src1, Src2, Ty);
503 case ICmpInst::ICMP_NE: return executeICMP_NE(Src1, Src2, Ty);
504 case ICmpInst::ICMP_UGT: return executeICMP_UGT(Src1, Src2, Ty);
505 case ICmpInst::ICMP_SGT: return executeICMP_SGT(Src1, Src2, Ty);
506 case ICmpInst::ICMP_ULT: return executeICMP_ULT(Src1, Src2, Ty);
507 case ICmpInst::ICMP_SLT: return executeICMP_SLT(Src1, Src2, Ty);
508 case ICmpInst::ICMP_UGE: return executeICMP_UGE(Src1, Src2, Ty);
509 case ICmpInst::ICMP_SGE: return executeICMP_SGE(Src1, Src2, Ty);
510 case ICmpInst::ICMP_ULE: return executeICMP_ULE(Src1, Src2, Ty);
511 case ICmpInst::ICMP_SLE: return executeICMP_SLE(Src1, Src2, Ty);
512 case FCmpInst::FCMP_ORD: return executeFCMP_ORD(Src1, Src2, Ty);
513 case FCmpInst::FCMP_UNO: return executeFCMP_UNO(Src1, Src2, Ty);
514 case FCmpInst::FCMP_OEQ: return executeFCMP_OEQ(Src1, Src2, Ty);
515 case FCmpInst::FCMP_UEQ: return executeFCMP_UEQ(Src1, Src2, Ty);
516 case FCmpInst::FCMP_ONE: return executeFCMP_ONE(Src1, Src2, Ty);
517 case FCmpInst::FCMP_UNE: return executeFCMP_UNE(Src1, Src2, Ty);
518 case FCmpInst::FCMP_OLT: return executeFCMP_OLT(Src1, Src2, Ty);
519 case FCmpInst::FCMP_ULT: return executeFCMP_ULT(Src1, Src2, Ty);
520 case FCmpInst::FCMP_OGT: return executeFCMP_OGT(Src1, Src2, Ty);
521 case FCmpInst::FCMP_UGT: return executeFCMP_UGT(Src1, Src2, Ty);
522 case FCmpInst::FCMP_OLE: return executeFCMP_OLE(Src1, Src2, Ty);
523 case FCmpInst::FCMP_ULE: return executeFCMP_ULE(Src1, Src2, Ty);
524 case FCmpInst::FCMP_OGE: return executeFCMP_OGE(Src1, Src2, Ty);
525 case FCmpInst::FCMP_UGE: return executeFCMP_UGE(Src1, Src2, Ty);
526 case FCmpInst::FCMP_FALSE: {
528 Result.IntVal = APInt(1, false);
531 case FCmpInst::FCMP_TRUE: {
533 Result.IntVal = APInt(1, true);
537 cerr << "Unhandled Cmp predicate\n";
542 void Interpreter::visitBinaryOperator(BinaryOperator &I) {
543 ExecutionContext &SF = ECStack.back();
544 const Type *Ty = I.getOperand(0)->getType();
545 GenericValue Src1 = getOperandValue(I.getOperand(0), SF);
546 GenericValue Src2 = getOperandValue(I.getOperand(1), SF);
547 GenericValue R; // Result
549 switch (I.getOpcode()) {
550 case Instruction::Add: executeAddInst (R, Src1, Src2, Ty); break;
551 case Instruction::Sub: executeSubInst (R, Src1, Src2, Ty); break;
552 case Instruction::Mul: executeMulInst (R, Src1, Src2, Ty); break;
553 case Instruction::FDiv: executeFDivInst (R, Src1, Src2, Ty); break;
554 case Instruction::FRem: executeFRemInst (R, Src1, Src2, Ty); break;
555 case Instruction::UDiv: R.IntVal = Src1.IntVal.udiv(Src2.IntVal); break;
556 case Instruction::SDiv: R.IntVal = Src1.IntVal.sdiv(Src2.IntVal); break;
557 case Instruction::URem: R.IntVal = Src1.IntVal.urem(Src2.IntVal); break;
558 case Instruction::SRem: R.IntVal = Src1.IntVal.srem(Src2.IntVal); break;
559 case Instruction::And: R.IntVal = Src1.IntVal & Src2.IntVal; break;
560 case Instruction::Or: R.IntVal = Src1.IntVal | Src2.IntVal; break;
561 case Instruction::Xor: R.IntVal = Src1.IntVal ^ Src2.IntVal; break;
563 cerr << "Don't know how to handle this binary operator!\n-->" << I;
570 static GenericValue executeSelectInst(GenericValue Src1, GenericValue Src2,
572 return Src1.IntVal == 0 ? Src3 : Src2;
575 void Interpreter::visitSelectInst(SelectInst &I) {
576 ExecutionContext &SF = ECStack.back();
577 GenericValue Src1 = getOperandValue(I.getOperand(0), SF);
578 GenericValue Src2 = getOperandValue(I.getOperand(1), SF);
579 GenericValue Src3 = getOperandValue(I.getOperand(2), SF);
580 GenericValue R = executeSelectInst(Src1, Src2, Src3);
585 //===----------------------------------------------------------------------===//
586 // Terminator Instruction Implementations
587 //===----------------------------------------------------------------------===//
589 void Interpreter::exitCalled(GenericValue GV) {
590 // runAtExitHandlers() assumes there are no stack frames, but
591 // if exit() was called, then it had a stack frame. Blow away
592 // the stack before interpreting atexit handlers.
594 runAtExitHandlers ();
595 exit (GV.IntVal.zextOrTrunc(32).getZExtValue());
598 /// Pop the last stack frame off of ECStack and then copy the result
599 /// back into the result variable if we are not returning void. The
600 /// result variable may be the ExitValue, or the Value of the calling
601 /// CallInst if there was a previous stack frame. This method may
602 /// invalidate any ECStack iterators you have. This method also takes
603 /// care of switching to the normal destination BB, if we are returning
606 void Interpreter::popStackAndReturnValueToCaller (const Type *RetTy,
607 GenericValue Result) {
608 // Pop the current stack frame.
611 if (ECStack.empty()) { // Finished main. Put result into exit code...
612 if (RetTy && RetTy->isInteger()) { // Nonvoid return type?
613 ExitValue = Result; // Capture the exit value of the program
615 memset(&ExitValue.Untyped, 0, sizeof(ExitValue.Untyped));
618 // If we have a previous stack frame, and we have a previous call,
619 // fill in the return value...
620 ExecutionContext &CallingSF = ECStack.back();
621 if (Instruction *I = CallingSF.Caller.getInstruction()) {
622 if (CallingSF.Caller.getType() != Type::VoidTy) // Save result...
623 SetValue(I, Result, CallingSF);
624 if (InvokeInst *II = dyn_cast<InvokeInst> (I))
625 SwitchToNewBasicBlock (II->getNormalDest (), CallingSF);
626 CallingSF.Caller = CallSite(); // We returned from the call...
631 void Interpreter::visitReturnInst(ReturnInst &I) {
632 ExecutionContext &SF = ECStack.back();
633 const Type *RetTy = Type::VoidTy;
636 // Save away the return value... (if we are not 'ret void')
637 if (I.getNumOperands()) {
638 RetTy = I.getReturnValue()->getType();
639 Result = getOperandValue(I.getReturnValue(), SF);
642 popStackAndReturnValueToCaller(RetTy, Result);
645 void Interpreter::visitUnwindInst(UnwindInst &I) {
650 if (ECStack.empty ())
652 Inst = ECStack.back ().Caller.getInstruction ();
653 } while (!(Inst && isa<InvokeInst> (Inst)));
655 // Return from invoke
656 ExecutionContext &InvokingSF = ECStack.back ();
657 InvokingSF.Caller = CallSite ();
659 // Go to exceptional destination BB of invoke instruction
660 SwitchToNewBasicBlock(cast<InvokeInst>(Inst)->getUnwindDest(), InvokingSF);
663 void Interpreter::visitUnreachableInst(UnreachableInst &I) {
664 cerr << "ERROR: Program executed an 'unreachable' instruction!\n";
668 void Interpreter::visitBranchInst(BranchInst &I) {
669 ExecutionContext &SF = ECStack.back();
672 Dest = I.getSuccessor(0); // Uncond branches have a fixed dest...
673 if (!I.isUnconditional()) {
674 Value *Cond = I.getCondition();
675 if (getOperandValue(Cond, SF).IntVal == 0) // If false cond...
676 Dest = I.getSuccessor(1);
678 SwitchToNewBasicBlock(Dest, SF);
681 void Interpreter::visitSwitchInst(SwitchInst &I) {
682 ExecutionContext &SF = ECStack.back();
683 GenericValue CondVal = getOperandValue(I.getOperand(0), SF);
684 const Type *ElTy = I.getOperand(0)->getType();
686 // Check to see if any of the cases match...
687 BasicBlock *Dest = 0;
688 for (unsigned i = 2, e = I.getNumOperands(); i != e; i += 2)
689 if (executeICMP_EQ(CondVal, getOperandValue(I.getOperand(i), SF), ElTy)
691 Dest = cast<BasicBlock>(I.getOperand(i+1));
695 if (!Dest) Dest = I.getDefaultDest(); // No cases matched: use default
696 SwitchToNewBasicBlock(Dest, SF);
699 // SwitchToNewBasicBlock - This method is used to jump to a new basic block.
700 // This function handles the actual updating of block and instruction iterators
701 // as well as execution of all of the PHI nodes in the destination block.
703 // This method does this because all of the PHI nodes must be executed
704 // atomically, reading their inputs before any of the results are updated. Not
705 // doing this can cause problems if the PHI nodes depend on other PHI nodes for
706 // their inputs. If the input PHI node is updated before it is read, incorrect
707 // results can happen. Thus we use a two phase approach.
709 void Interpreter::SwitchToNewBasicBlock(BasicBlock *Dest, ExecutionContext &SF){
710 BasicBlock *PrevBB = SF.CurBB; // Remember where we came from...
711 SF.CurBB = Dest; // Update CurBB to branch destination
712 SF.CurInst = SF.CurBB->begin(); // Update new instruction ptr...
714 if (!isa<PHINode>(SF.CurInst)) return; // Nothing fancy to do
716 // Loop over all of the PHI nodes in the current block, reading their inputs.
717 std::vector<GenericValue> ResultValues;
719 for (; PHINode *PN = dyn_cast<PHINode>(SF.CurInst); ++SF.CurInst) {
720 // Search for the value corresponding to this previous bb...
721 int i = PN->getBasicBlockIndex(PrevBB);
722 assert(i != -1 && "PHINode doesn't contain entry for predecessor??");
723 Value *IncomingValue = PN->getIncomingValue(i);
725 // Save the incoming value for this PHI node...
726 ResultValues.push_back(getOperandValue(IncomingValue, SF));
729 // Now loop over all of the PHI nodes setting their values...
730 SF.CurInst = SF.CurBB->begin();
731 for (unsigned i = 0; isa<PHINode>(SF.CurInst); ++SF.CurInst, ++i) {
732 PHINode *PN = cast<PHINode>(SF.CurInst);
733 SetValue(PN, ResultValues[i], SF);
737 //===----------------------------------------------------------------------===//
738 // Memory Instruction Implementations
739 //===----------------------------------------------------------------------===//
741 void Interpreter::visitAllocationInst(AllocationInst &I) {
742 ExecutionContext &SF = ECStack.back();
744 const Type *Ty = I.getType()->getElementType(); // Type to be allocated
746 // Get the number of elements being allocated by the array...
747 unsigned NumElements =
748 getOperandValue(I.getOperand(0), SF).IntVal.getZExtValue();
750 unsigned TypeSize = (size_t)TD.getABITypeSize(Ty);
752 // Avoid malloc-ing zero bytes, use max()...
753 unsigned MemToAlloc = std::max(1U, NumElements * TypeSize);
755 // Allocate enough memory to hold the type...
756 void *Memory = malloc(MemToAlloc);
758 DOUT << "Allocated Type: " << *Ty << " (" << TypeSize << " bytes) x "
759 << NumElements << " (Total: " << MemToAlloc << ") at "
760 << uintptr_t(Memory) << '\n';
762 GenericValue Result = PTOGV(Memory);
763 assert(Result.PointerVal != 0 && "Null pointer returned by malloc!");
764 SetValue(&I, Result, SF);
766 if (I.getOpcode() == Instruction::Alloca)
767 ECStack.back().Allocas.add(Memory);
770 void Interpreter::visitFreeInst(FreeInst &I) {
771 ExecutionContext &SF = ECStack.back();
772 assert(isa<PointerType>(I.getOperand(0)->getType()) && "Freeing nonptr?");
773 GenericValue Value = getOperandValue(I.getOperand(0), SF);
774 // TODO: Check to make sure memory is allocated
775 free(GVTOP(Value)); // Free memory
778 // getElementOffset - The workhorse for getelementptr.
780 GenericValue Interpreter::executeGEPOperation(Value *Ptr, gep_type_iterator I,
782 ExecutionContext &SF) {
783 assert(isa<PointerType>(Ptr->getType()) &&
784 "Cannot getElementOffset of a nonpointer type!");
788 for (; I != E; ++I) {
789 if (const StructType *STy = dyn_cast<StructType>(*I)) {
790 const StructLayout *SLO = TD.getStructLayout(STy);
792 const ConstantInt *CPU = cast<ConstantInt>(I.getOperand());
793 unsigned Index = unsigned(CPU->getZExtValue());
795 Total += SLO->getElementOffset(Index);
797 const SequentialType *ST = cast<SequentialType>(*I);
798 // Get the index number for the array... which must be long type...
799 GenericValue IdxGV = getOperandValue(I.getOperand(), SF);
803 cast<IntegerType>(I.getOperand()->getType())->getBitWidth();
805 Idx = (int64_t)(int32_t)IdxGV.IntVal.getZExtValue();
807 assert(BitWidth == 64 && "Invalid index type for getelementptr");
808 Idx = (int64_t)IdxGV.IntVal.getZExtValue();
810 Total += TD.getABITypeSize(ST->getElementType())*Idx;
815 Result.PointerVal = ((char*)getOperandValue(Ptr, SF).PointerVal) + Total;
816 DOUT << "GEP Index " << Total << " bytes.\n";
820 void Interpreter::visitGetElementPtrInst(GetElementPtrInst &I) {
821 ExecutionContext &SF = ECStack.back();
822 SetValue(&I, TheEE->executeGEPOperation(I.getPointerOperand(),
823 gep_type_begin(I), gep_type_end(I), SF), SF);
826 void Interpreter::visitLoadInst(LoadInst &I) {
827 ExecutionContext &SF = ECStack.back();
828 GenericValue SRC = getOperandValue(I.getPointerOperand(), SF);
829 GenericValue *Ptr = (GenericValue*)GVTOP(SRC);
831 LoadValueFromMemory(Result, Ptr, I.getType());
832 SetValue(&I, Result, SF);
835 void Interpreter::visitStoreInst(StoreInst &I) {
836 ExecutionContext &SF = ECStack.back();
837 GenericValue Val = getOperandValue(I.getOperand(0), SF);
838 GenericValue SRC = getOperandValue(I.getPointerOperand(), SF);
839 StoreValueToMemory(Val, (GenericValue *)GVTOP(SRC),
840 I.getOperand(0)->getType());
843 //===----------------------------------------------------------------------===//
844 // Miscellaneous Instruction Implementations
845 //===----------------------------------------------------------------------===//
847 void Interpreter::visitCallSite(CallSite CS) {
848 ExecutionContext &SF = ECStack.back();
850 // Check to see if this is an intrinsic function call...
851 Function *F = CS.getCalledFunction();
852 if (F && F->isDeclaration ())
853 switch (F->getIntrinsicID()) {
854 case Intrinsic::not_intrinsic:
856 case Intrinsic::vastart: { // va_start
857 GenericValue ArgIndex;
858 ArgIndex.UIntPairVal.first = ECStack.size() - 1;
859 ArgIndex.UIntPairVal.second = 0;
860 SetValue(CS.getInstruction(), ArgIndex, SF);
863 case Intrinsic::vaend: // va_end is a noop for the interpreter
865 case Intrinsic::vacopy: // va_copy: dest = src
866 SetValue(CS.getInstruction(), getOperandValue(*CS.arg_begin(), SF), SF);
869 // If it is an unknown intrinsic function, use the intrinsic lowering
870 // class to transform it into hopefully tasty LLVM code.
872 BasicBlock::iterator me(CS.getInstruction());
873 BasicBlock *Parent = CS.getInstruction()->getParent();
874 bool atBegin(Parent->begin() == me);
877 IL->LowerIntrinsicCall(cast<CallInst>(CS.getInstruction()));
879 // Restore the CurInst pointer to the first instruction newly inserted, if
882 SF.CurInst = Parent->begin();
892 std::vector<GenericValue> ArgVals;
893 const unsigned NumArgs = SF.Caller.arg_size();
894 ArgVals.reserve(NumArgs);
896 for (CallSite::arg_iterator i = SF.Caller.arg_begin(),
897 e = SF.Caller.arg_end(); i != e; ++i, ++pNum) {
899 ArgVals.push_back(getOperandValue(V, SF));
900 // Promote all integral types whose size is < sizeof(i32) into i32.
901 // We do this by zero or sign extending the value as appropriate
902 // according to the parameter attributes
903 const Type *Ty = V->getType();
904 if (Ty->isInteger() && (ArgVals.back().IntVal.getBitWidth() < 32)) {
905 if (CS.paramHasAttr(pNum, ParamAttr::ZExt))
906 ArgVals.back().IntVal = ArgVals.back().IntVal.zext(32);
907 else if (CS.paramHasAttr(pNum, ParamAttr::SExt))
908 ArgVals.back().IntVal = ArgVals.back().IntVal.sext(32);
912 // To handle indirect calls, we must get the pointer value from the argument
913 // and treat it as a function pointer.
914 GenericValue SRC = getOperandValue(SF.Caller.getCalledValue(), SF);
915 callFunction((Function*)GVTOP(SRC), ArgVals);
918 void Interpreter::visitShl(BinaryOperator &I) {
919 ExecutionContext &SF = ECStack.back();
920 GenericValue Src1 = getOperandValue(I.getOperand(0), SF);
921 GenericValue Src2 = getOperandValue(I.getOperand(1), SF);
923 Dest.IntVal = Src1.IntVal.shl(Src2.IntVal.getZExtValue());
924 SetValue(&I, Dest, SF);
927 void Interpreter::visitLShr(BinaryOperator &I) {
928 ExecutionContext &SF = ECStack.back();
929 GenericValue Src1 = getOperandValue(I.getOperand(0), SF);
930 GenericValue Src2 = getOperandValue(I.getOperand(1), SF);
932 Dest.IntVal = Src1.IntVal.lshr(Src2.IntVal.getZExtValue());
933 SetValue(&I, Dest, SF);
936 void Interpreter::visitAShr(BinaryOperator &I) {
937 ExecutionContext &SF = ECStack.back();
938 GenericValue Src1 = getOperandValue(I.getOperand(0), SF);
939 GenericValue Src2 = getOperandValue(I.getOperand(1), SF);
941 Dest.IntVal = Src1.IntVal.ashr(Src2.IntVal.getZExtValue());
942 SetValue(&I, Dest, SF);
945 GenericValue Interpreter::executeTruncInst(Value *SrcVal, const Type *DstTy,
946 ExecutionContext &SF) {
947 GenericValue Dest, Src = getOperandValue(SrcVal, SF);
948 const IntegerType *DITy = cast<IntegerType>(DstTy);
949 unsigned DBitWidth = DITy->getBitWidth();
950 Dest.IntVal = Src.IntVal.trunc(DBitWidth);
954 GenericValue Interpreter::executeSExtInst(Value *SrcVal, const Type *DstTy,
955 ExecutionContext &SF) {
956 GenericValue Dest, Src = getOperandValue(SrcVal, SF);
957 const IntegerType *DITy = cast<IntegerType>(DstTy);
958 unsigned DBitWidth = DITy->getBitWidth();
959 Dest.IntVal = Src.IntVal.sext(DBitWidth);
963 GenericValue Interpreter::executeZExtInst(Value *SrcVal, const Type *DstTy,
964 ExecutionContext &SF) {
965 GenericValue Dest, Src = getOperandValue(SrcVal, SF);
966 const IntegerType *DITy = cast<IntegerType>(DstTy);
967 unsigned DBitWidth = DITy->getBitWidth();
968 Dest.IntVal = Src.IntVal.zext(DBitWidth);
972 GenericValue Interpreter::executeFPTruncInst(Value *SrcVal, const Type *DstTy,
973 ExecutionContext &SF) {
974 GenericValue Dest, Src = getOperandValue(SrcVal, SF);
975 assert(SrcVal->getType() == Type::DoubleTy && DstTy == Type::FloatTy &&
976 "Invalid FPTrunc instruction");
977 Dest.FloatVal = (float) Src.DoubleVal;
981 GenericValue Interpreter::executeFPExtInst(Value *SrcVal, const Type *DstTy,
982 ExecutionContext &SF) {
983 GenericValue Dest, Src = getOperandValue(SrcVal, SF);
984 assert(SrcVal->getType() == Type::FloatTy && DstTy == Type::DoubleTy &&
985 "Invalid FPTrunc instruction");
986 Dest.DoubleVal = (double) Src.FloatVal;
990 GenericValue Interpreter::executeFPToUIInst(Value *SrcVal, const Type *DstTy,
991 ExecutionContext &SF) {
992 const Type *SrcTy = SrcVal->getType();
993 uint32_t DBitWidth = cast<IntegerType>(DstTy)->getBitWidth();
994 GenericValue Dest, Src = getOperandValue(SrcVal, SF);
995 assert(SrcTy->isFloatingPoint() && "Invalid FPToUI instruction");
997 if (SrcTy->getTypeID() == Type::FloatTyID)
998 Dest.IntVal = APIntOps::RoundFloatToAPInt(Src.FloatVal, DBitWidth);
1000 Dest.IntVal = APIntOps::RoundDoubleToAPInt(Src.DoubleVal, DBitWidth);
1004 GenericValue Interpreter::executeFPToSIInst(Value *SrcVal, const Type *DstTy,
1005 ExecutionContext &SF) {
1006 const Type *SrcTy = SrcVal->getType();
1007 uint32_t DBitWidth = cast<IntegerType>(DstTy)->getBitWidth();
1008 GenericValue Dest, Src = getOperandValue(SrcVal, SF);
1009 assert(SrcTy->isFloatingPoint() && "Invalid FPToSI instruction");
1011 if (SrcTy->getTypeID() == Type::FloatTyID)
1012 Dest.IntVal = APIntOps::RoundFloatToAPInt(Src.FloatVal, DBitWidth);
1014 Dest.IntVal = APIntOps::RoundDoubleToAPInt(Src.DoubleVal, DBitWidth);
1018 GenericValue Interpreter::executeUIToFPInst(Value *SrcVal, const Type *DstTy,
1019 ExecutionContext &SF) {
1020 GenericValue Dest, Src = getOperandValue(SrcVal, SF);
1021 assert(DstTy->isFloatingPoint() && "Invalid UIToFP instruction");
1023 if (DstTy->getTypeID() == Type::FloatTyID)
1024 Dest.FloatVal = APIntOps::RoundAPIntToFloat(Src.IntVal);
1026 Dest.DoubleVal = APIntOps::RoundAPIntToDouble(Src.IntVal);
1030 GenericValue Interpreter::executeSIToFPInst(Value *SrcVal, const Type *DstTy,
1031 ExecutionContext &SF) {
1032 GenericValue Dest, Src = getOperandValue(SrcVal, SF);
1033 assert(DstTy->isFloatingPoint() && "Invalid SIToFP instruction");
1035 if (DstTy->getTypeID() == Type::FloatTyID)
1036 Dest.FloatVal = APIntOps::RoundSignedAPIntToFloat(Src.IntVal);
1038 Dest.DoubleVal = APIntOps::RoundSignedAPIntToDouble(Src.IntVal);
1043 GenericValue Interpreter::executePtrToIntInst(Value *SrcVal, const Type *DstTy,
1044 ExecutionContext &SF) {
1045 uint32_t DBitWidth = cast<IntegerType>(DstTy)->getBitWidth();
1046 GenericValue Dest, Src = getOperandValue(SrcVal, SF);
1047 assert(isa<PointerType>(SrcVal->getType()) && "Invalid PtrToInt instruction");
1049 Dest.IntVal = APInt(DBitWidth, (intptr_t) Src.PointerVal);
1053 GenericValue Interpreter::executeIntToPtrInst(Value *SrcVal, const Type *DstTy,
1054 ExecutionContext &SF) {
1055 GenericValue Dest, Src = getOperandValue(SrcVal, SF);
1056 assert(isa<PointerType>(DstTy) && "Invalid PtrToInt instruction");
1058 uint32_t PtrSize = TD.getPointerSizeInBits();
1059 if (PtrSize != Src.IntVal.getBitWidth())
1060 Src.IntVal = Src.IntVal.zextOrTrunc(PtrSize);
1062 Dest.PointerVal = PointerTy(intptr_t(Src.IntVal.getZExtValue()));
1066 GenericValue Interpreter::executeBitCastInst(Value *SrcVal, const Type *DstTy,
1067 ExecutionContext &SF) {
1069 const Type *SrcTy = SrcVal->getType();
1070 GenericValue Dest, Src = getOperandValue(SrcVal, SF);
1071 if (isa<PointerType>(DstTy)) {
1072 assert(isa<PointerType>(SrcTy) && "Invalid BitCast");
1073 Dest.PointerVal = Src.PointerVal;
1074 } else if (DstTy->isInteger()) {
1075 if (SrcTy == Type::FloatTy) {
1076 Dest.IntVal.zext(sizeof(Src.FloatVal) * 8);
1077 Dest.IntVal.floatToBits(Src.FloatVal);
1078 } else if (SrcTy == Type::DoubleTy) {
1079 Dest.IntVal.zext(sizeof(Src.DoubleVal) * 8);
1080 Dest.IntVal.doubleToBits(Src.DoubleVal);
1081 } else if (SrcTy->isInteger()) {
1082 Dest.IntVal = Src.IntVal;
1084 assert(0 && "Invalid BitCast");
1085 } else if (DstTy == Type::FloatTy) {
1086 if (SrcTy->isInteger())
1087 Dest.FloatVal = Src.IntVal.bitsToFloat();
1089 Dest.FloatVal = Src.FloatVal;
1090 } else if (DstTy == Type::DoubleTy) {
1091 if (SrcTy->isInteger())
1092 Dest.DoubleVal = Src.IntVal.bitsToDouble();
1094 Dest.DoubleVal = Src.DoubleVal;
1096 assert(0 && "Invalid Bitcast");
1101 void Interpreter::visitTruncInst(TruncInst &I) {
1102 ExecutionContext &SF = ECStack.back();
1103 SetValue(&I, executeTruncInst(I.getOperand(0), I.getType(), SF), SF);
1106 void Interpreter::visitSExtInst(SExtInst &I) {
1107 ExecutionContext &SF = ECStack.back();
1108 SetValue(&I, executeSExtInst(I.getOperand(0), I.getType(), SF), SF);
1111 void Interpreter::visitZExtInst(ZExtInst &I) {
1112 ExecutionContext &SF = ECStack.back();
1113 SetValue(&I, executeZExtInst(I.getOperand(0), I.getType(), SF), SF);
1116 void Interpreter::visitFPTruncInst(FPTruncInst &I) {
1117 ExecutionContext &SF = ECStack.back();
1118 SetValue(&I, executeFPTruncInst(I.getOperand(0), I.getType(), SF), SF);
1121 void Interpreter::visitFPExtInst(FPExtInst &I) {
1122 ExecutionContext &SF = ECStack.back();
1123 SetValue(&I, executeFPExtInst(I.getOperand(0), I.getType(), SF), SF);
1126 void Interpreter::visitUIToFPInst(UIToFPInst &I) {
1127 ExecutionContext &SF = ECStack.back();
1128 SetValue(&I, executeUIToFPInst(I.getOperand(0), I.getType(), SF), SF);
1131 void Interpreter::visitSIToFPInst(SIToFPInst &I) {
1132 ExecutionContext &SF = ECStack.back();
1133 SetValue(&I, executeSIToFPInst(I.getOperand(0), I.getType(), SF), SF);
1136 void Interpreter::visitFPToUIInst(FPToUIInst &I) {
1137 ExecutionContext &SF = ECStack.back();
1138 SetValue(&I, executeFPToUIInst(I.getOperand(0), I.getType(), SF), SF);
1141 void Interpreter::visitFPToSIInst(FPToSIInst &I) {
1142 ExecutionContext &SF = ECStack.back();
1143 SetValue(&I, executeFPToSIInst(I.getOperand(0), I.getType(), SF), SF);
1146 void Interpreter::visitPtrToIntInst(PtrToIntInst &I) {
1147 ExecutionContext &SF = ECStack.back();
1148 SetValue(&I, executePtrToIntInst(I.getOperand(0), I.getType(), SF), SF);
1151 void Interpreter::visitIntToPtrInst(IntToPtrInst &I) {
1152 ExecutionContext &SF = ECStack.back();
1153 SetValue(&I, executeIntToPtrInst(I.getOperand(0), I.getType(), SF), SF);
1156 void Interpreter::visitBitCastInst(BitCastInst &I) {
1157 ExecutionContext &SF = ECStack.back();
1158 SetValue(&I, executeBitCastInst(I.getOperand(0), I.getType(), SF), SF);
1161 #define IMPLEMENT_VAARG(TY) \
1162 case Type::TY##TyID: Dest.TY##Val = Src.TY##Val; break
1164 void Interpreter::visitVAArgInst(VAArgInst &I) {
1165 ExecutionContext &SF = ECStack.back();
1167 // Get the incoming valist parameter. LLI treats the valist as a
1168 // (ec-stack-depth var-arg-index) pair.
1169 GenericValue VAList = getOperandValue(I.getOperand(0), SF);
1171 GenericValue Src = ECStack[VAList.UIntPairVal.first]
1172 .VarArgs[VAList.UIntPairVal.second];
1173 const Type *Ty = I.getType();
1174 switch (Ty->getTypeID()) {
1175 case Type::IntegerTyID: Dest.IntVal = Src.IntVal;
1176 IMPLEMENT_VAARG(Pointer);
1177 IMPLEMENT_VAARG(Float);
1178 IMPLEMENT_VAARG(Double);
1180 cerr << "Unhandled dest type for vaarg instruction: " << *Ty << "\n";
1184 // Set the Value of this Instruction.
1185 SetValue(&I, Dest, SF);
1187 // Move the pointer to the next vararg.
1188 ++VAList.UIntPairVal.second;
1191 GenericValue Interpreter::getConstantExprValue (ConstantExpr *CE,
1192 ExecutionContext &SF) {
1193 switch (CE->getOpcode()) {
1194 case Instruction::Trunc:
1195 return executeTruncInst(CE->getOperand(0), CE->getType(), SF);
1196 case Instruction::ZExt:
1197 return executeZExtInst(CE->getOperand(0), CE->getType(), SF);
1198 case Instruction::SExt:
1199 return executeSExtInst(CE->getOperand(0), CE->getType(), SF);
1200 case Instruction::FPTrunc:
1201 return executeFPTruncInst(CE->getOperand(0), CE->getType(), SF);
1202 case Instruction::FPExt:
1203 return executeFPExtInst(CE->getOperand(0), CE->getType(), SF);
1204 case Instruction::UIToFP:
1205 return executeUIToFPInst(CE->getOperand(0), CE->getType(), SF);
1206 case Instruction::SIToFP:
1207 return executeSIToFPInst(CE->getOperand(0), CE->getType(), SF);
1208 case Instruction::FPToUI:
1209 return executeFPToUIInst(CE->getOperand(0), CE->getType(), SF);
1210 case Instruction::FPToSI:
1211 return executeFPToSIInst(CE->getOperand(0), CE->getType(), SF);
1212 case Instruction::PtrToInt:
1213 return executePtrToIntInst(CE->getOperand(0), CE->getType(), SF);
1214 case Instruction::IntToPtr:
1215 return executeIntToPtrInst(CE->getOperand(0), CE->getType(), SF);
1216 case Instruction::BitCast:
1217 return executeBitCastInst(CE->getOperand(0), CE->getType(), SF);
1218 case Instruction::GetElementPtr:
1219 return executeGEPOperation(CE->getOperand(0), gep_type_begin(CE),
1220 gep_type_end(CE), SF);
1221 case Instruction::FCmp:
1222 case Instruction::ICmp:
1223 return executeCmpInst(CE->getPredicate(),
1224 getOperandValue(CE->getOperand(0), SF),
1225 getOperandValue(CE->getOperand(1), SF),
1226 CE->getOperand(0)->getType());
1227 case Instruction::Select:
1228 return executeSelectInst(getOperandValue(CE->getOperand(0), SF),
1229 getOperandValue(CE->getOperand(1), SF),
1230 getOperandValue(CE->getOperand(2), SF));
1235 // The cases below here require a GenericValue parameter for the result
1236 // so we initialize one, compute it and then return it.
1237 GenericValue Op0 = getOperandValue(CE->getOperand(0), SF);
1238 GenericValue Op1 = getOperandValue(CE->getOperand(1), SF);
1240 const Type * Ty = CE->getOperand(0)->getType();
1241 switch (CE->getOpcode()) {
1242 case Instruction::Add: executeAddInst (Dest, Op0, Op1, Ty); break;
1243 case Instruction::Sub: executeSubInst (Dest, Op0, Op1, Ty); break;
1244 case Instruction::Mul: executeMulInst (Dest, Op0, Op1, Ty); break;
1245 case Instruction::FDiv: executeFDivInst(Dest, Op0, Op1, Ty); break;
1246 case Instruction::FRem: executeFRemInst(Dest, Op0, Op1, Ty); break;
1247 case Instruction::SDiv: Dest.IntVal = Op0.IntVal.sdiv(Op1.IntVal); break;
1248 case Instruction::UDiv: Dest.IntVal = Op0.IntVal.udiv(Op1.IntVal); break;
1249 case Instruction::URem: Dest.IntVal = Op0.IntVal.urem(Op1.IntVal); break;
1250 case Instruction::SRem: Dest.IntVal = Op0.IntVal.srem(Op1.IntVal); break;
1251 case Instruction::And: Dest.IntVal = Op0.IntVal.And(Op1.IntVal); break;
1252 case Instruction::Or: Dest.IntVal = Op0.IntVal.Or(Op1.IntVal); break;
1253 case Instruction::Xor: Dest.IntVal = Op0.IntVal.Xor(Op1.IntVal); break;
1254 case Instruction::Shl:
1255 Dest.IntVal = Op0.IntVal.shl(Op1.IntVal.getZExtValue());
1257 case Instruction::LShr:
1258 Dest.IntVal = Op0.IntVal.lshr(Op1.IntVal.getZExtValue());
1260 case Instruction::AShr:
1261 Dest.IntVal = Op0.IntVal.ashr(Op1.IntVal.getZExtValue());
1264 cerr << "Unhandled ConstantExpr: " << *CE << "\n";
1266 return GenericValue();
1271 GenericValue Interpreter::getOperandValue(Value *V, ExecutionContext &SF) {
1272 if (ConstantExpr *CE = dyn_cast<ConstantExpr>(V)) {
1273 return getConstantExprValue(CE, SF);
1274 } else if (Constant *CPV = dyn_cast<Constant>(V)) {
1275 return getConstantValue(CPV);
1276 } else if (GlobalValue *GV = dyn_cast<GlobalValue>(V)) {
1277 return PTOGV(getPointerToGlobal(GV));
1279 return SF.Values[V];
1283 //===----------------------------------------------------------------------===//
1284 // Dispatch and Execution Code
1285 //===----------------------------------------------------------------------===//
1287 //===----------------------------------------------------------------------===//
1288 // callFunction - Execute the specified function...
1290 void Interpreter::callFunction(Function *F,
1291 const std::vector<GenericValue> &ArgVals) {
1292 assert((ECStack.empty() || ECStack.back().Caller.getInstruction() == 0 ||
1293 ECStack.back().Caller.arg_size() == ArgVals.size()) &&
1294 "Incorrect number of arguments passed into function call!");
1295 // Make a new stack frame... and fill it in.
1296 ECStack.push_back(ExecutionContext());
1297 ExecutionContext &StackFrame = ECStack.back();
1298 StackFrame.CurFunction = F;
1300 // Special handling for external functions.
1301 if (F->isDeclaration()) {
1302 GenericValue Result = callExternalFunction (F, ArgVals);
1303 // Simulate a 'ret' instruction of the appropriate type.
1304 popStackAndReturnValueToCaller (F->getReturnType (), Result);
1308 // Get pointers to first LLVM BB & Instruction in function.
1309 StackFrame.CurBB = F->begin();
1310 StackFrame.CurInst = StackFrame.CurBB->begin();
1312 // Run through the function arguments and initialize their values...
1313 assert((ArgVals.size() == F->arg_size() ||
1314 (ArgVals.size() > F->arg_size() && F->getFunctionType()->isVarArg()))&&
1315 "Invalid number of values passed to function invocation!");
1317 // Handle non-varargs arguments...
1319 for (Function::arg_iterator AI = F->arg_begin(), E = F->arg_end();
1321 SetValue(AI, ArgVals[i], StackFrame);
1323 // Handle varargs arguments...
1324 StackFrame.VarArgs.assign(ArgVals.begin()+i, ArgVals.end());
1328 void Interpreter::run() {
1329 while (!ECStack.empty()) {
1330 // Interpret a single instruction & increment the "PC".
1331 ExecutionContext &SF = ECStack.back(); // Current stack frame
1332 Instruction &I = *SF.CurInst++; // Increment before execute
1334 // Track the number of dynamic instructions executed.
1337 DOUT << "About to interpret: " << I;
1338 visit(I); // Dispatch to one of the visit* methods...
1340 // This is not safe, as visiting the instruction could lower it and free I.
1342 if (!isa<CallInst>(I) && !isa<InvokeInst>(I) &&
1343 I.getType() != Type::VoidTy) {
1345 const GenericValue &Val = SF.Values[&I];
1346 switch (I.getType()->getTypeID()) {
1347 default: assert(0 && "Invalid GenericValue Type");
1348 case Type::VoidTyID: DOUT << "void"; break;
1349 case Type::FloatTyID: DOUT << "float " << Val.FloatVal; break;
1350 case Type::DoubleTyID: DOUT << "double " << Val.DoubleVal; break;
1351 case Type::PointerTyID: DOUT << "void* " << intptr_t(Val.PointerVal);
1353 case Type::IntegerTyID:
1354 DOUT << "i" << Val.IntVal.getBitWidth() << " "
1355 << Val.IntVal.toStringUnsigned(10)
1356 << " (0x" << Val.IntVal.toStringUnsigned(16) << ")\n";