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/CodeGen/IntrinsicLowering.h"
20 #include "llvm/Support/GetElementPtrTypeIterator.h"
21 #include "llvm/ADT/APInt.h"
22 #include "llvm/ADT/Statistic.h"
23 #include "llvm/Support/CommandLine.h"
24 #include "llvm/Support/Debug.h"
25 #include "llvm/Support/ErrorHandling.h"
26 #include "llvm/Support/MathExtras.h"
32 STATISTIC(NumDynamicInsts, "Number of dynamic instructions executed");
34 static cl::opt<bool> PrintVolatile("interpreter-print-volatile", cl::Hidden,
35 cl::desc("make the interpreter print every volatile load and store"));
37 //===----------------------------------------------------------------------===//
38 // Various Helper Functions
39 //===----------------------------------------------------------------------===//
41 static void SetValue(Value *V, GenericValue Val, ExecutionContext &SF) {
45 //===----------------------------------------------------------------------===//
46 // Binary Instruction Implementations
47 //===----------------------------------------------------------------------===//
49 #define IMPLEMENT_BINARY_OPERATOR(OP, TY) \
50 case Type::TY##TyID: \
51 Dest.TY##Val = Src1.TY##Val OP Src2.TY##Val; \
54 static void executeFAddInst(GenericValue &Dest, GenericValue Src1,
55 GenericValue Src2, const Type *Ty) {
56 switch (Ty->getTypeID()) {
57 IMPLEMENT_BINARY_OPERATOR(+, Float);
58 IMPLEMENT_BINARY_OPERATOR(+, Double);
60 cerr << "Unhandled type for FAdd instruction: " << *Ty << "\n";
65 static void executeFSubInst(GenericValue &Dest, GenericValue Src1,
66 GenericValue Src2, const Type *Ty) {
67 switch (Ty->getTypeID()) {
68 IMPLEMENT_BINARY_OPERATOR(-, Float);
69 IMPLEMENT_BINARY_OPERATOR(-, Double);
71 cerr << "Unhandled type for FSub instruction: " << *Ty << "\n";
76 static void executeFMulInst(GenericValue &Dest, GenericValue Src1,
77 GenericValue Src2, const Type *Ty) {
78 switch (Ty->getTypeID()) {
79 IMPLEMENT_BINARY_OPERATOR(*, Float);
80 IMPLEMENT_BINARY_OPERATOR(*, Double);
82 cerr << "Unhandled type for FMul instruction: " << *Ty << "\n";
87 static void executeFDivInst(GenericValue &Dest, GenericValue Src1,
88 GenericValue Src2, const Type *Ty) {
89 switch (Ty->getTypeID()) {
90 IMPLEMENT_BINARY_OPERATOR(/, Float);
91 IMPLEMENT_BINARY_OPERATOR(/, Double);
93 cerr << "Unhandled type for FDiv instruction: " << *Ty << "\n";
98 static void executeFRemInst(GenericValue &Dest, GenericValue Src1,
99 GenericValue Src2, const Type *Ty) {
100 switch (Ty->getTypeID()) {
101 case Type::FloatTyID:
102 Dest.FloatVal = fmod(Src1.FloatVal, Src2.FloatVal);
104 case Type::DoubleTyID:
105 Dest.DoubleVal = fmod(Src1.DoubleVal, Src2.DoubleVal);
108 cerr << "Unhandled type for Rem instruction: " << *Ty << "\n";
113 #define IMPLEMENT_INTEGER_ICMP(OP, TY) \
114 case Type::IntegerTyID: \
115 Dest.IntVal = APInt(1,Src1.IntVal.OP(Src2.IntVal)); \
118 // Handle pointers specially because they must be compared with only as much
119 // width as the host has. We _do not_ want to be comparing 64 bit values when
120 // running on a 32-bit target, otherwise the upper 32 bits might mess up
121 // comparisons if they contain garbage.
122 #define IMPLEMENT_POINTER_ICMP(OP) \
123 case Type::PointerTyID: \
124 Dest.IntVal = APInt(1,(void*)(intptr_t)Src1.PointerVal OP \
125 (void*)(intptr_t)Src2.PointerVal); \
128 static GenericValue executeICMP_EQ(GenericValue Src1, GenericValue Src2,
131 switch (Ty->getTypeID()) {
132 IMPLEMENT_INTEGER_ICMP(eq,Ty);
133 IMPLEMENT_POINTER_ICMP(==);
135 cerr << "Unhandled type for ICMP_EQ predicate: " << *Ty << "\n";
141 static GenericValue executeICMP_NE(GenericValue Src1, GenericValue Src2,
144 switch (Ty->getTypeID()) {
145 IMPLEMENT_INTEGER_ICMP(ne,Ty);
146 IMPLEMENT_POINTER_ICMP(!=);
148 cerr << "Unhandled type for ICMP_NE predicate: " << *Ty << "\n";
154 static GenericValue executeICMP_ULT(GenericValue Src1, GenericValue Src2,
157 switch (Ty->getTypeID()) {
158 IMPLEMENT_INTEGER_ICMP(ult,Ty);
159 IMPLEMENT_POINTER_ICMP(<);
161 cerr << "Unhandled type for ICMP_ULT predicate: " << *Ty << "\n";
167 static GenericValue executeICMP_SLT(GenericValue Src1, GenericValue Src2,
170 switch (Ty->getTypeID()) {
171 IMPLEMENT_INTEGER_ICMP(slt,Ty);
172 IMPLEMENT_POINTER_ICMP(<);
174 cerr << "Unhandled type for ICMP_SLT predicate: " << *Ty << "\n";
180 static GenericValue executeICMP_UGT(GenericValue Src1, GenericValue Src2,
183 switch (Ty->getTypeID()) {
184 IMPLEMENT_INTEGER_ICMP(ugt,Ty);
185 IMPLEMENT_POINTER_ICMP(>);
187 cerr << "Unhandled type for ICMP_UGT predicate: " << *Ty << "\n";
193 static GenericValue executeICMP_SGT(GenericValue Src1, GenericValue Src2,
196 switch (Ty->getTypeID()) {
197 IMPLEMENT_INTEGER_ICMP(sgt,Ty);
198 IMPLEMENT_POINTER_ICMP(>);
200 cerr << "Unhandled type for ICMP_SGT predicate: " << *Ty << "\n";
206 static GenericValue executeICMP_ULE(GenericValue Src1, GenericValue Src2,
209 switch (Ty->getTypeID()) {
210 IMPLEMENT_INTEGER_ICMP(ule,Ty);
211 IMPLEMENT_POINTER_ICMP(<=);
213 cerr << "Unhandled type for ICMP_ULE predicate: " << *Ty << "\n";
219 static GenericValue executeICMP_SLE(GenericValue Src1, GenericValue Src2,
222 switch (Ty->getTypeID()) {
223 IMPLEMENT_INTEGER_ICMP(sle,Ty);
224 IMPLEMENT_POINTER_ICMP(<=);
226 cerr << "Unhandled type for ICMP_SLE predicate: " << *Ty << "\n";
232 static GenericValue executeICMP_UGE(GenericValue Src1, GenericValue Src2,
235 switch (Ty->getTypeID()) {
236 IMPLEMENT_INTEGER_ICMP(uge,Ty);
237 IMPLEMENT_POINTER_ICMP(>=);
239 cerr << "Unhandled type for ICMP_UGE predicate: " << *Ty << "\n";
245 static GenericValue executeICMP_SGE(GenericValue Src1, GenericValue Src2,
248 switch (Ty->getTypeID()) {
249 IMPLEMENT_INTEGER_ICMP(sge,Ty);
250 IMPLEMENT_POINTER_ICMP(>=);
252 cerr << "Unhandled type for ICMP_SGE predicate: " << *Ty << "\n";
258 void Interpreter::visitICmpInst(ICmpInst &I) {
259 ExecutionContext &SF = ECStack.back();
260 const Type *Ty = I.getOperand(0)->getType();
261 GenericValue Src1 = getOperandValue(I.getOperand(0), SF);
262 GenericValue Src2 = getOperandValue(I.getOperand(1), SF);
263 GenericValue R; // Result
265 switch (I.getPredicate()) {
266 case ICmpInst::ICMP_EQ: R = executeICMP_EQ(Src1, Src2, Ty); break;
267 case ICmpInst::ICMP_NE: R = executeICMP_NE(Src1, Src2, Ty); break;
268 case ICmpInst::ICMP_ULT: R = executeICMP_ULT(Src1, Src2, Ty); break;
269 case ICmpInst::ICMP_SLT: R = executeICMP_SLT(Src1, Src2, Ty); break;
270 case ICmpInst::ICMP_UGT: R = executeICMP_UGT(Src1, Src2, Ty); break;
271 case ICmpInst::ICMP_SGT: R = executeICMP_SGT(Src1, Src2, Ty); break;
272 case ICmpInst::ICMP_ULE: R = executeICMP_ULE(Src1, Src2, Ty); break;
273 case ICmpInst::ICMP_SLE: R = executeICMP_SLE(Src1, Src2, Ty); break;
274 case ICmpInst::ICMP_UGE: R = executeICMP_UGE(Src1, Src2, Ty); break;
275 case ICmpInst::ICMP_SGE: R = executeICMP_SGE(Src1, Src2, Ty); break;
277 cerr << "Don't know how to handle this ICmp predicate!\n-->" << I;
284 #define IMPLEMENT_FCMP(OP, TY) \
285 case Type::TY##TyID: \
286 Dest.IntVal = APInt(1,Src1.TY##Val OP Src2.TY##Val); \
289 static GenericValue executeFCMP_OEQ(GenericValue Src1, GenericValue Src2,
292 switch (Ty->getTypeID()) {
293 IMPLEMENT_FCMP(==, Float);
294 IMPLEMENT_FCMP(==, Double);
296 cerr << "Unhandled type for FCmp EQ instruction: " << *Ty << "\n";
302 static GenericValue executeFCMP_ONE(GenericValue Src1, GenericValue Src2,
305 switch (Ty->getTypeID()) {
306 IMPLEMENT_FCMP(!=, Float);
307 IMPLEMENT_FCMP(!=, Double);
310 cerr << "Unhandled type for FCmp NE instruction: " << *Ty << "\n";
316 static GenericValue executeFCMP_OLE(GenericValue Src1, GenericValue Src2,
319 switch (Ty->getTypeID()) {
320 IMPLEMENT_FCMP(<=, Float);
321 IMPLEMENT_FCMP(<=, Double);
323 cerr << "Unhandled type for FCmp LE instruction: " << *Ty << "\n";
329 static GenericValue executeFCMP_OGE(GenericValue Src1, GenericValue Src2,
332 switch (Ty->getTypeID()) {
333 IMPLEMENT_FCMP(>=, Float);
334 IMPLEMENT_FCMP(>=, Double);
336 cerr << "Unhandled type for FCmp GE instruction: " << *Ty << "\n";
342 static GenericValue executeFCMP_OLT(GenericValue Src1, GenericValue Src2,
345 switch (Ty->getTypeID()) {
346 IMPLEMENT_FCMP(<, Float);
347 IMPLEMENT_FCMP(<, Double);
349 cerr << "Unhandled type for FCmp LT instruction: " << *Ty << "\n";
355 static GenericValue executeFCMP_OGT(GenericValue Src1, GenericValue Src2,
358 switch (Ty->getTypeID()) {
359 IMPLEMENT_FCMP(>, Float);
360 IMPLEMENT_FCMP(>, Double);
362 cerr << "Unhandled type for FCmp GT instruction: " << *Ty << "\n";
368 #define IMPLEMENT_UNORDERED(TY, X,Y) \
369 if (TY == Type::FloatTy) { \
370 if (X.FloatVal != X.FloatVal || Y.FloatVal != Y.FloatVal) { \
371 Dest.IntVal = APInt(1,true); \
374 } else if (X.DoubleVal != X.DoubleVal || Y.DoubleVal != Y.DoubleVal) { \
375 Dest.IntVal = APInt(1,true); \
380 static GenericValue executeFCMP_UEQ(GenericValue Src1, GenericValue Src2,
383 IMPLEMENT_UNORDERED(Ty, Src1, Src2)
384 return executeFCMP_OEQ(Src1, Src2, Ty);
387 static GenericValue executeFCMP_UNE(GenericValue Src1, GenericValue Src2,
390 IMPLEMENT_UNORDERED(Ty, Src1, Src2)
391 return executeFCMP_ONE(Src1, Src2, Ty);
394 static GenericValue executeFCMP_ULE(GenericValue Src1, GenericValue Src2,
397 IMPLEMENT_UNORDERED(Ty, Src1, Src2)
398 return executeFCMP_OLE(Src1, Src2, Ty);
401 static GenericValue executeFCMP_UGE(GenericValue Src1, GenericValue Src2,
404 IMPLEMENT_UNORDERED(Ty, Src1, Src2)
405 return executeFCMP_OGE(Src1, Src2, Ty);
408 static GenericValue executeFCMP_ULT(GenericValue Src1, GenericValue Src2,
411 IMPLEMENT_UNORDERED(Ty, Src1, Src2)
412 return executeFCMP_OLT(Src1, Src2, Ty);
415 static GenericValue executeFCMP_UGT(GenericValue Src1, GenericValue Src2,
418 IMPLEMENT_UNORDERED(Ty, Src1, Src2)
419 return executeFCMP_OGT(Src1, Src2, Ty);
422 static GenericValue executeFCMP_ORD(GenericValue Src1, GenericValue Src2,
425 if (Ty == Type::FloatTy)
426 Dest.IntVal = APInt(1,(Src1.FloatVal == Src1.FloatVal &&
427 Src2.FloatVal == Src2.FloatVal));
429 Dest.IntVal = APInt(1,(Src1.DoubleVal == Src1.DoubleVal &&
430 Src2.DoubleVal == Src2.DoubleVal));
434 static GenericValue executeFCMP_UNO(GenericValue Src1, GenericValue Src2,
437 if (Ty == Type::FloatTy)
438 Dest.IntVal = APInt(1,(Src1.FloatVal != Src1.FloatVal ||
439 Src2.FloatVal != Src2.FloatVal));
441 Dest.IntVal = APInt(1,(Src1.DoubleVal != Src1.DoubleVal ||
442 Src2.DoubleVal != Src2.DoubleVal));
446 void Interpreter::visitFCmpInst(FCmpInst &I) {
447 ExecutionContext &SF = ECStack.back();
448 const Type *Ty = I.getOperand(0)->getType();
449 GenericValue Src1 = getOperandValue(I.getOperand(0), SF);
450 GenericValue Src2 = getOperandValue(I.getOperand(1), SF);
451 GenericValue R; // Result
453 switch (I.getPredicate()) {
454 case FCmpInst::FCMP_FALSE: R.IntVal = APInt(1,false); break;
455 case FCmpInst::FCMP_TRUE: R.IntVal = APInt(1,true); break;
456 case FCmpInst::FCMP_ORD: R = executeFCMP_ORD(Src1, Src2, Ty); break;
457 case FCmpInst::FCMP_UNO: R = executeFCMP_UNO(Src1, Src2, Ty); break;
458 case FCmpInst::FCMP_UEQ: R = executeFCMP_UEQ(Src1, Src2, Ty); break;
459 case FCmpInst::FCMP_OEQ: R = executeFCMP_OEQ(Src1, Src2, Ty); break;
460 case FCmpInst::FCMP_UNE: R = executeFCMP_UNE(Src1, Src2, Ty); break;
461 case FCmpInst::FCMP_ONE: R = executeFCMP_ONE(Src1, Src2, Ty); break;
462 case FCmpInst::FCMP_ULT: R = executeFCMP_ULT(Src1, Src2, Ty); break;
463 case FCmpInst::FCMP_OLT: R = executeFCMP_OLT(Src1, Src2, Ty); break;
464 case FCmpInst::FCMP_UGT: R = executeFCMP_UGT(Src1, Src2, Ty); break;
465 case FCmpInst::FCMP_OGT: R = executeFCMP_OGT(Src1, Src2, Ty); break;
466 case FCmpInst::FCMP_ULE: R = executeFCMP_ULE(Src1, Src2, Ty); break;
467 case FCmpInst::FCMP_OLE: R = executeFCMP_OLE(Src1, Src2, Ty); break;
468 case FCmpInst::FCMP_UGE: R = executeFCMP_UGE(Src1, Src2, Ty); break;
469 case FCmpInst::FCMP_OGE: R = executeFCMP_OGE(Src1, Src2, Ty); break;
471 cerr << "Don't know how to handle this FCmp predicate!\n-->" << I;
478 static GenericValue executeCmpInst(unsigned predicate, GenericValue Src1,
479 GenericValue Src2, const Type *Ty) {
482 case ICmpInst::ICMP_EQ: return executeICMP_EQ(Src1, Src2, Ty);
483 case ICmpInst::ICMP_NE: return executeICMP_NE(Src1, Src2, Ty);
484 case ICmpInst::ICMP_UGT: return executeICMP_UGT(Src1, Src2, Ty);
485 case ICmpInst::ICMP_SGT: return executeICMP_SGT(Src1, Src2, Ty);
486 case ICmpInst::ICMP_ULT: return executeICMP_ULT(Src1, Src2, Ty);
487 case ICmpInst::ICMP_SLT: return executeICMP_SLT(Src1, Src2, Ty);
488 case ICmpInst::ICMP_UGE: return executeICMP_UGE(Src1, Src2, Ty);
489 case ICmpInst::ICMP_SGE: return executeICMP_SGE(Src1, Src2, Ty);
490 case ICmpInst::ICMP_ULE: return executeICMP_ULE(Src1, Src2, Ty);
491 case ICmpInst::ICMP_SLE: return executeICMP_SLE(Src1, Src2, Ty);
492 case FCmpInst::FCMP_ORD: return executeFCMP_ORD(Src1, Src2, Ty);
493 case FCmpInst::FCMP_UNO: return executeFCMP_UNO(Src1, Src2, Ty);
494 case FCmpInst::FCMP_OEQ: return executeFCMP_OEQ(Src1, Src2, Ty);
495 case FCmpInst::FCMP_UEQ: return executeFCMP_UEQ(Src1, Src2, Ty);
496 case FCmpInst::FCMP_ONE: return executeFCMP_ONE(Src1, Src2, Ty);
497 case FCmpInst::FCMP_UNE: return executeFCMP_UNE(Src1, Src2, Ty);
498 case FCmpInst::FCMP_OLT: return executeFCMP_OLT(Src1, Src2, Ty);
499 case FCmpInst::FCMP_ULT: return executeFCMP_ULT(Src1, Src2, Ty);
500 case FCmpInst::FCMP_OGT: return executeFCMP_OGT(Src1, Src2, Ty);
501 case FCmpInst::FCMP_UGT: return executeFCMP_UGT(Src1, Src2, Ty);
502 case FCmpInst::FCMP_OLE: return executeFCMP_OLE(Src1, Src2, Ty);
503 case FCmpInst::FCMP_ULE: return executeFCMP_ULE(Src1, Src2, Ty);
504 case FCmpInst::FCMP_OGE: return executeFCMP_OGE(Src1, Src2, Ty);
505 case FCmpInst::FCMP_UGE: return executeFCMP_UGE(Src1, Src2, Ty);
506 case FCmpInst::FCMP_FALSE: {
508 Result.IntVal = APInt(1, false);
511 case FCmpInst::FCMP_TRUE: {
513 Result.IntVal = APInt(1, true);
517 cerr << "Unhandled Cmp predicate\n";
522 void Interpreter::visitBinaryOperator(BinaryOperator &I) {
523 ExecutionContext &SF = ECStack.back();
524 const Type *Ty = I.getOperand(0)->getType();
525 GenericValue Src1 = getOperandValue(I.getOperand(0), SF);
526 GenericValue Src2 = getOperandValue(I.getOperand(1), SF);
527 GenericValue R; // Result
529 switch (I.getOpcode()) {
530 case Instruction::Add: R.IntVal = Src1.IntVal + Src2.IntVal; break;
531 case Instruction::Sub: R.IntVal = Src1.IntVal - Src2.IntVal; break;
532 case Instruction::Mul: R.IntVal = Src1.IntVal * Src2.IntVal; break;
533 case Instruction::FAdd: executeFAddInst(R, Src1, Src2, Ty); break;
534 case Instruction::FSub: executeFSubInst(R, Src1, Src2, Ty); break;
535 case Instruction::FMul: executeFMulInst(R, Src1, Src2, Ty); break;
536 case Instruction::FDiv: executeFDivInst(R, Src1, Src2, Ty); break;
537 case Instruction::FRem: executeFRemInst(R, Src1, Src2, Ty); break;
538 case Instruction::UDiv: R.IntVal = Src1.IntVal.udiv(Src2.IntVal); break;
539 case Instruction::SDiv: R.IntVal = Src1.IntVal.sdiv(Src2.IntVal); break;
540 case Instruction::URem: R.IntVal = Src1.IntVal.urem(Src2.IntVal); break;
541 case Instruction::SRem: R.IntVal = Src1.IntVal.srem(Src2.IntVal); break;
542 case Instruction::And: R.IntVal = Src1.IntVal & Src2.IntVal; break;
543 case Instruction::Or: R.IntVal = Src1.IntVal | Src2.IntVal; break;
544 case Instruction::Xor: R.IntVal = Src1.IntVal ^ Src2.IntVal; break;
546 cerr << "Don't know how to handle this binary operator!\n-->" << I;
553 static GenericValue executeSelectInst(GenericValue Src1, GenericValue Src2,
555 return Src1.IntVal == 0 ? Src3 : Src2;
558 void Interpreter::visitSelectInst(SelectInst &I) {
559 ExecutionContext &SF = ECStack.back();
560 GenericValue Src1 = getOperandValue(I.getOperand(0), SF);
561 GenericValue Src2 = getOperandValue(I.getOperand(1), SF);
562 GenericValue Src3 = getOperandValue(I.getOperand(2), SF);
563 GenericValue R = executeSelectInst(Src1, Src2, Src3);
568 //===----------------------------------------------------------------------===//
569 // Terminator Instruction Implementations
570 //===----------------------------------------------------------------------===//
572 void Interpreter::exitCalled(GenericValue GV) {
573 // runAtExitHandlers() assumes there are no stack frames, but
574 // if exit() was called, then it had a stack frame. Blow away
575 // the stack before interpreting atexit handlers.
577 runAtExitHandlers ();
578 exit (GV.IntVal.zextOrTrunc(32).getZExtValue());
581 /// Pop the last stack frame off of ECStack and then copy the result
582 /// back into the result variable if we are not returning void. The
583 /// result variable may be the ExitValue, or the Value of the calling
584 /// CallInst if there was a previous stack frame. This method may
585 /// invalidate any ECStack iterators you have. This method also takes
586 /// care of switching to the normal destination BB, if we are returning
589 void Interpreter::popStackAndReturnValueToCaller (const Type *RetTy,
590 GenericValue Result) {
591 // Pop the current stack frame.
594 if (ECStack.empty()) { // Finished main. Put result into exit code...
595 if (RetTy && RetTy->isInteger()) { // Nonvoid return type?
596 ExitValue = Result; // Capture the exit value of the program
598 memset(&ExitValue.Untyped, 0, sizeof(ExitValue.Untyped));
601 // If we have a previous stack frame, and we have a previous call,
602 // fill in the return value...
603 ExecutionContext &CallingSF = ECStack.back();
604 if (Instruction *I = CallingSF.Caller.getInstruction()) {
605 if (CallingSF.Caller.getType() != Type::VoidTy) // Save result...
606 SetValue(I, Result, CallingSF);
607 if (InvokeInst *II = dyn_cast<InvokeInst> (I))
608 SwitchToNewBasicBlock (II->getNormalDest (), CallingSF);
609 CallingSF.Caller = CallSite(); // We returned from the call...
614 void Interpreter::visitReturnInst(ReturnInst &I) {
615 ExecutionContext &SF = ECStack.back();
616 const Type *RetTy = Type::VoidTy;
619 // Save away the return value... (if we are not 'ret void')
620 if (I.getNumOperands()) {
621 RetTy = I.getReturnValue()->getType();
622 Result = getOperandValue(I.getReturnValue(), SF);
625 popStackAndReturnValueToCaller(RetTy, Result);
628 void Interpreter::visitUnwindInst(UnwindInst &I) {
633 if (ECStack.empty ())
634 llvm_report_error("Empty stack during unwind!");
635 Inst = ECStack.back ().Caller.getInstruction ();
636 } while (!(Inst && isa<InvokeInst> (Inst)));
638 // Return from invoke
639 ExecutionContext &InvokingSF = ECStack.back ();
640 InvokingSF.Caller = CallSite ();
642 // Go to exceptional destination BB of invoke instruction
643 SwitchToNewBasicBlock(cast<InvokeInst>(Inst)->getUnwindDest(), InvokingSF);
646 void Interpreter::visitUnreachableInst(UnreachableInst &I) {
647 llvm_report_error("Program executed an 'unreachable' instruction!");
650 void Interpreter::visitBranchInst(BranchInst &I) {
651 ExecutionContext &SF = ECStack.back();
654 Dest = I.getSuccessor(0); // Uncond branches have a fixed dest...
655 if (!I.isUnconditional()) {
656 Value *Cond = I.getCondition();
657 if (getOperandValue(Cond, SF).IntVal == 0) // If false cond...
658 Dest = I.getSuccessor(1);
660 SwitchToNewBasicBlock(Dest, SF);
663 void Interpreter::visitSwitchInst(SwitchInst &I) {
664 ExecutionContext &SF = ECStack.back();
665 GenericValue CondVal = getOperandValue(I.getOperand(0), SF);
666 const Type *ElTy = I.getOperand(0)->getType();
668 // Check to see if any of the cases match...
669 BasicBlock *Dest = 0;
670 for (unsigned i = 2, e = I.getNumOperands(); i != e; i += 2)
671 if (executeICMP_EQ(CondVal, getOperandValue(I.getOperand(i), SF), ElTy)
673 Dest = cast<BasicBlock>(I.getOperand(i+1));
677 if (!Dest) Dest = I.getDefaultDest(); // No cases matched: use default
678 SwitchToNewBasicBlock(Dest, SF);
681 // SwitchToNewBasicBlock - This method is used to jump to a new basic block.
682 // This function handles the actual updating of block and instruction iterators
683 // as well as execution of all of the PHI nodes in the destination block.
685 // This method does this because all of the PHI nodes must be executed
686 // atomically, reading their inputs before any of the results are updated. Not
687 // doing this can cause problems if the PHI nodes depend on other PHI nodes for
688 // their inputs. If the input PHI node is updated before it is read, incorrect
689 // results can happen. Thus we use a two phase approach.
691 void Interpreter::SwitchToNewBasicBlock(BasicBlock *Dest, ExecutionContext &SF){
692 BasicBlock *PrevBB = SF.CurBB; // Remember where we came from...
693 SF.CurBB = Dest; // Update CurBB to branch destination
694 SF.CurInst = SF.CurBB->begin(); // Update new instruction ptr...
696 if (!isa<PHINode>(SF.CurInst)) return; // Nothing fancy to do
698 // Loop over all of the PHI nodes in the current block, reading their inputs.
699 std::vector<GenericValue> ResultValues;
701 for (; PHINode *PN = dyn_cast<PHINode>(SF.CurInst); ++SF.CurInst) {
702 // Search for the value corresponding to this previous bb...
703 int i = PN->getBasicBlockIndex(PrevBB);
704 assert(i != -1 && "PHINode doesn't contain entry for predecessor??");
705 Value *IncomingValue = PN->getIncomingValue(i);
707 // Save the incoming value for this PHI node...
708 ResultValues.push_back(getOperandValue(IncomingValue, SF));
711 // Now loop over all of the PHI nodes setting their values...
712 SF.CurInst = SF.CurBB->begin();
713 for (unsigned i = 0; isa<PHINode>(SF.CurInst); ++SF.CurInst, ++i) {
714 PHINode *PN = cast<PHINode>(SF.CurInst);
715 SetValue(PN, ResultValues[i], SF);
719 //===----------------------------------------------------------------------===//
720 // Memory Instruction Implementations
721 //===----------------------------------------------------------------------===//
723 void Interpreter::visitAllocationInst(AllocationInst &I) {
724 ExecutionContext &SF = ECStack.back();
726 const Type *Ty = I.getType()->getElementType(); // Type to be allocated
728 // Get the number of elements being allocated by the array...
729 unsigned NumElements =
730 getOperandValue(I.getOperand(0), SF).IntVal.getZExtValue();
732 unsigned TypeSize = (size_t)TD.getTypeAllocSize(Ty);
734 // Avoid malloc-ing zero bytes, use max()...
735 unsigned MemToAlloc = std::max(1U, NumElements * TypeSize);
737 // Allocate enough memory to hold the type...
738 void *Memory = malloc(MemToAlloc);
740 DOUT << "Allocated Type: " << *Ty << " (" << TypeSize << " bytes) x "
741 << NumElements << " (Total: " << MemToAlloc << ") at "
742 << uintptr_t(Memory) << '\n';
744 GenericValue Result = PTOGV(Memory);
745 assert(Result.PointerVal != 0 && "Null pointer returned by malloc!");
746 SetValue(&I, Result, SF);
748 if (I.getOpcode() == Instruction::Alloca)
749 ECStack.back().Allocas.add(Memory);
752 void Interpreter::visitFreeInst(FreeInst &I) {
753 ExecutionContext &SF = ECStack.back();
754 assert(isa<PointerType>(I.getOperand(0)->getType()) && "Freeing nonptr?");
755 GenericValue Value = getOperandValue(I.getOperand(0), SF);
756 // TODO: Check to make sure memory is allocated
757 free(GVTOP(Value)); // Free memory
760 // getElementOffset - The workhorse for getelementptr.
762 GenericValue Interpreter::executeGEPOperation(Value *Ptr, gep_type_iterator I,
764 ExecutionContext &SF) {
765 assert(isa<PointerType>(Ptr->getType()) &&
766 "Cannot getElementOffset of a nonpointer type!");
770 for (; I != E; ++I) {
771 if (const StructType *STy = dyn_cast<StructType>(*I)) {
772 const StructLayout *SLO = TD.getStructLayout(STy);
774 const ConstantInt *CPU = cast<ConstantInt>(I.getOperand());
775 unsigned Index = unsigned(CPU->getZExtValue());
777 Total += SLO->getElementOffset(Index);
779 const SequentialType *ST = cast<SequentialType>(*I);
780 // Get the index number for the array... which must be long type...
781 GenericValue IdxGV = getOperandValue(I.getOperand(), SF);
785 cast<IntegerType>(I.getOperand()->getType())->getBitWidth();
787 Idx = (int64_t)(int32_t)IdxGV.IntVal.getZExtValue();
789 assert(BitWidth == 64 && "Invalid index type for getelementptr");
790 Idx = (int64_t)IdxGV.IntVal.getZExtValue();
792 Total += TD.getTypeAllocSize(ST->getElementType())*Idx;
797 Result.PointerVal = ((char*)getOperandValue(Ptr, SF).PointerVal) + Total;
798 DOUT << "GEP Index " << Total << " bytes.\n";
802 void Interpreter::visitGetElementPtrInst(GetElementPtrInst &I) {
803 ExecutionContext &SF = ECStack.back();
804 SetValue(&I, executeGEPOperation(I.getPointerOperand(),
805 gep_type_begin(I), gep_type_end(I), SF), SF);
808 void Interpreter::visitLoadInst(LoadInst &I) {
809 ExecutionContext &SF = ECStack.back();
810 GenericValue SRC = getOperandValue(I.getPointerOperand(), SF);
811 GenericValue *Ptr = (GenericValue*)GVTOP(SRC);
813 LoadValueFromMemory(Result, Ptr, I.getType());
814 SetValue(&I, Result, SF);
815 if (I.isVolatile() && PrintVolatile)
816 cerr << "Volatile load " << I;
819 void Interpreter::visitStoreInst(StoreInst &I) {
820 ExecutionContext &SF = ECStack.back();
821 GenericValue Val = getOperandValue(I.getOperand(0), SF);
822 GenericValue SRC = getOperandValue(I.getPointerOperand(), SF);
823 StoreValueToMemory(Val, (GenericValue *)GVTOP(SRC),
824 I.getOperand(0)->getType());
825 if (I.isVolatile() && PrintVolatile)
826 cerr << "Volatile store: " << I;
829 //===----------------------------------------------------------------------===//
830 // Miscellaneous Instruction Implementations
831 //===----------------------------------------------------------------------===//
833 void Interpreter::visitCallSite(CallSite CS) {
834 ExecutionContext &SF = ECStack.back();
836 // Check to see if this is an intrinsic function call...
837 Function *F = CS.getCalledFunction();
838 if (F && F->isDeclaration ())
839 switch (F->getIntrinsicID()) {
840 case Intrinsic::not_intrinsic:
842 case Intrinsic::vastart: { // va_start
843 GenericValue ArgIndex;
844 ArgIndex.UIntPairVal.first = ECStack.size() - 1;
845 ArgIndex.UIntPairVal.second = 0;
846 SetValue(CS.getInstruction(), ArgIndex, SF);
849 case Intrinsic::vaend: // va_end is a noop for the interpreter
851 case Intrinsic::vacopy: // va_copy: dest = src
852 SetValue(CS.getInstruction(), getOperandValue(*CS.arg_begin(), SF), SF);
855 // If it is an unknown intrinsic function, use the intrinsic lowering
856 // class to transform it into hopefully tasty LLVM code.
858 BasicBlock::iterator me(CS.getInstruction());
859 BasicBlock *Parent = CS.getInstruction()->getParent();
860 bool atBegin(Parent->begin() == me);
863 IL->LowerIntrinsicCall(cast<CallInst>(CS.getInstruction()));
865 // Restore the CurInst pointer to the first instruction newly inserted, if
868 SF.CurInst = Parent->begin();
878 std::vector<GenericValue> ArgVals;
879 const unsigned NumArgs = SF.Caller.arg_size();
880 ArgVals.reserve(NumArgs);
882 for (CallSite::arg_iterator i = SF.Caller.arg_begin(),
883 e = SF.Caller.arg_end(); i != e; ++i, ++pNum) {
885 ArgVals.push_back(getOperandValue(V, SF));
886 // Promote all integral types whose size is < sizeof(i32) into i32.
887 // We do this by zero or sign extending the value as appropriate
888 // according to the parameter attributes
889 const Type *Ty = V->getType();
890 if (Ty->isInteger() && (ArgVals.back().IntVal.getBitWidth() < 32)) {
891 if (CS.paramHasAttr(pNum, Attribute::ZExt))
892 ArgVals.back().IntVal = ArgVals.back().IntVal.zext(32);
893 else if (CS.paramHasAttr(pNum, Attribute::SExt))
894 ArgVals.back().IntVal = ArgVals.back().IntVal.sext(32);
898 // To handle indirect calls, we must get the pointer value from the argument
899 // and treat it as a function pointer.
900 GenericValue SRC = getOperandValue(SF.Caller.getCalledValue(), SF);
901 callFunction((Function*)GVTOP(SRC), ArgVals);
904 void Interpreter::visitShl(BinaryOperator &I) {
905 ExecutionContext &SF = ECStack.back();
906 GenericValue Src1 = getOperandValue(I.getOperand(0), SF);
907 GenericValue Src2 = getOperandValue(I.getOperand(1), SF);
909 if (Src2.IntVal.getZExtValue() < Src1.IntVal.getBitWidth())
910 Dest.IntVal = Src1.IntVal.shl(Src2.IntVal.getZExtValue());
912 Dest.IntVal = Src1.IntVal;
914 SetValue(&I, Dest, SF);
917 void Interpreter::visitLShr(BinaryOperator &I) {
918 ExecutionContext &SF = ECStack.back();
919 GenericValue Src1 = getOperandValue(I.getOperand(0), SF);
920 GenericValue Src2 = getOperandValue(I.getOperand(1), SF);
922 if (Src2.IntVal.getZExtValue() < Src1.IntVal.getBitWidth())
923 Dest.IntVal = Src1.IntVal.lshr(Src2.IntVal.getZExtValue());
925 Dest.IntVal = Src1.IntVal;
927 SetValue(&I, Dest, SF);
930 void Interpreter::visitAShr(BinaryOperator &I) {
931 ExecutionContext &SF = ECStack.back();
932 GenericValue Src1 = getOperandValue(I.getOperand(0), SF);
933 GenericValue Src2 = getOperandValue(I.getOperand(1), SF);
935 if (Src2.IntVal.getZExtValue() < Src1.IntVal.getBitWidth())
936 Dest.IntVal = Src1.IntVal.ashr(Src2.IntVal.getZExtValue());
938 Dest.IntVal = Src1.IntVal;
940 SetValue(&I, Dest, SF);
943 GenericValue Interpreter::executeTruncInst(Value *SrcVal, const Type *DstTy,
944 ExecutionContext &SF) {
945 GenericValue Dest, Src = getOperandValue(SrcVal, SF);
946 const IntegerType *DITy = cast<IntegerType>(DstTy);
947 unsigned DBitWidth = DITy->getBitWidth();
948 Dest.IntVal = Src.IntVal.trunc(DBitWidth);
952 GenericValue Interpreter::executeSExtInst(Value *SrcVal, const Type *DstTy,
953 ExecutionContext &SF) {
954 GenericValue Dest, Src = getOperandValue(SrcVal, SF);
955 const IntegerType *DITy = cast<IntegerType>(DstTy);
956 unsigned DBitWidth = DITy->getBitWidth();
957 Dest.IntVal = Src.IntVal.sext(DBitWidth);
961 GenericValue Interpreter::executeZExtInst(Value *SrcVal, const Type *DstTy,
962 ExecutionContext &SF) {
963 GenericValue Dest, Src = getOperandValue(SrcVal, SF);
964 const IntegerType *DITy = cast<IntegerType>(DstTy);
965 unsigned DBitWidth = DITy->getBitWidth();
966 Dest.IntVal = Src.IntVal.zext(DBitWidth);
970 GenericValue Interpreter::executeFPTruncInst(Value *SrcVal, const Type *DstTy,
971 ExecutionContext &SF) {
972 GenericValue Dest, Src = getOperandValue(SrcVal, SF);
973 assert(SrcVal->getType() == Type::DoubleTy && DstTy == Type::FloatTy &&
974 "Invalid FPTrunc instruction");
975 Dest.FloatVal = (float) Src.DoubleVal;
979 GenericValue Interpreter::executeFPExtInst(Value *SrcVal, const Type *DstTy,
980 ExecutionContext &SF) {
981 GenericValue Dest, Src = getOperandValue(SrcVal, SF);
982 assert(SrcVal->getType() == Type::FloatTy && DstTy == Type::DoubleTy &&
983 "Invalid FPTrunc instruction");
984 Dest.DoubleVal = (double) Src.FloatVal;
988 GenericValue Interpreter::executeFPToUIInst(Value *SrcVal, const Type *DstTy,
989 ExecutionContext &SF) {
990 const Type *SrcTy = SrcVal->getType();
991 uint32_t DBitWidth = cast<IntegerType>(DstTy)->getBitWidth();
992 GenericValue Dest, Src = getOperandValue(SrcVal, SF);
993 assert(SrcTy->isFloatingPoint() && "Invalid FPToUI instruction");
995 if (SrcTy->getTypeID() == Type::FloatTyID)
996 Dest.IntVal = APIntOps::RoundFloatToAPInt(Src.FloatVal, DBitWidth);
998 Dest.IntVal = APIntOps::RoundDoubleToAPInt(Src.DoubleVal, DBitWidth);
1002 GenericValue Interpreter::executeFPToSIInst(Value *SrcVal, const Type *DstTy,
1003 ExecutionContext &SF) {
1004 const Type *SrcTy = SrcVal->getType();
1005 uint32_t DBitWidth = cast<IntegerType>(DstTy)->getBitWidth();
1006 GenericValue Dest, Src = getOperandValue(SrcVal, SF);
1007 assert(SrcTy->isFloatingPoint() && "Invalid FPToSI instruction");
1009 if (SrcTy->getTypeID() == Type::FloatTyID)
1010 Dest.IntVal = APIntOps::RoundFloatToAPInt(Src.FloatVal, DBitWidth);
1012 Dest.IntVal = APIntOps::RoundDoubleToAPInt(Src.DoubleVal, DBitWidth);
1016 GenericValue Interpreter::executeUIToFPInst(Value *SrcVal, const Type *DstTy,
1017 ExecutionContext &SF) {
1018 GenericValue Dest, Src = getOperandValue(SrcVal, SF);
1019 assert(DstTy->isFloatingPoint() && "Invalid UIToFP instruction");
1021 if (DstTy->getTypeID() == Type::FloatTyID)
1022 Dest.FloatVal = APIntOps::RoundAPIntToFloat(Src.IntVal);
1024 Dest.DoubleVal = APIntOps::RoundAPIntToDouble(Src.IntVal);
1028 GenericValue Interpreter::executeSIToFPInst(Value *SrcVal, const Type *DstTy,
1029 ExecutionContext &SF) {
1030 GenericValue Dest, Src = getOperandValue(SrcVal, SF);
1031 assert(DstTy->isFloatingPoint() && "Invalid SIToFP instruction");
1033 if (DstTy->getTypeID() == Type::FloatTyID)
1034 Dest.FloatVal = APIntOps::RoundSignedAPIntToFloat(Src.IntVal);
1036 Dest.DoubleVal = APIntOps::RoundSignedAPIntToDouble(Src.IntVal);
1041 GenericValue Interpreter::executePtrToIntInst(Value *SrcVal, const Type *DstTy,
1042 ExecutionContext &SF) {
1043 uint32_t DBitWidth = cast<IntegerType>(DstTy)->getBitWidth();
1044 GenericValue Dest, Src = getOperandValue(SrcVal, SF);
1045 assert(isa<PointerType>(SrcVal->getType()) && "Invalid PtrToInt instruction");
1047 Dest.IntVal = APInt(DBitWidth, (intptr_t) Src.PointerVal);
1051 GenericValue Interpreter::executeIntToPtrInst(Value *SrcVal, const Type *DstTy,
1052 ExecutionContext &SF) {
1053 GenericValue Dest, Src = getOperandValue(SrcVal, SF);
1054 assert(isa<PointerType>(DstTy) && "Invalid PtrToInt instruction");
1056 uint32_t PtrSize = TD.getPointerSizeInBits();
1057 if (PtrSize != Src.IntVal.getBitWidth())
1058 Src.IntVal = Src.IntVal.zextOrTrunc(PtrSize);
1060 Dest.PointerVal = PointerTy(intptr_t(Src.IntVal.getZExtValue()));
1064 GenericValue Interpreter::executeBitCastInst(Value *SrcVal, const Type *DstTy,
1065 ExecutionContext &SF) {
1067 const Type *SrcTy = SrcVal->getType();
1068 GenericValue Dest, Src = getOperandValue(SrcVal, SF);
1069 if (isa<PointerType>(DstTy)) {
1070 assert(isa<PointerType>(SrcTy) && "Invalid BitCast");
1071 Dest.PointerVal = Src.PointerVal;
1072 } else if (DstTy->isInteger()) {
1073 if (SrcTy == Type::FloatTy) {
1074 Dest.IntVal.zext(sizeof(Src.FloatVal) * CHAR_BIT);
1075 Dest.IntVal.floatToBits(Src.FloatVal);
1076 } else if (SrcTy == Type::DoubleTy) {
1077 Dest.IntVal.zext(sizeof(Src.DoubleVal) * CHAR_BIT);
1078 Dest.IntVal.doubleToBits(Src.DoubleVal);
1079 } else if (SrcTy->isInteger()) {
1080 Dest.IntVal = Src.IntVal;
1082 llvm_unreachable("Invalid BitCast");
1083 } else if (DstTy == Type::FloatTy) {
1084 if (SrcTy->isInteger())
1085 Dest.FloatVal = Src.IntVal.bitsToFloat();
1087 Dest.FloatVal = Src.FloatVal;
1088 } else if (DstTy == Type::DoubleTy) {
1089 if (SrcTy->isInteger())
1090 Dest.DoubleVal = Src.IntVal.bitsToDouble();
1092 Dest.DoubleVal = Src.DoubleVal;
1094 llvm_unreachable("Invalid Bitcast");
1099 void Interpreter::visitTruncInst(TruncInst &I) {
1100 ExecutionContext &SF = ECStack.back();
1101 SetValue(&I, executeTruncInst(I.getOperand(0), I.getType(), SF), SF);
1104 void Interpreter::visitSExtInst(SExtInst &I) {
1105 ExecutionContext &SF = ECStack.back();
1106 SetValue(&I, executeSExtInst(I.getOperand(0), I.getType(), SF), SF);
1109 void Interpreter::visitZExtInst(ZExtInst &I) {
1110 ExecutionContext &SF = ECStack.back();
1111 SetValue(&I, executeZExtInst(I.getOperand(0), I.getType(), SF), SF);
1114 void Interpreter::visitFPTruncInst(FPTruncInst &I) {
1115 ExecutionContext &SF = ECStack.back();
1116 SetValue(&I, executeFPTruncInst(I.getOperand(0), I.getType(), SF), SF);
1119 void Interpreter::visitFPExtInst(FPExtInst &I) {
1120 ExecutionContext &SF = ECStack.back();
1121 SetValue(&I, executeFPExtInst(I.getOperand(0), I.getType(), SF), SF);
1124 void Interpreter::visitUIToFPInst(UIToFPInst &I) {
1125 ExecutionContext &SF = ECStack.back();
1126 SetValue(&I, executeUIToFPInst(I.getOperand(0), I.getType(), SF), SF);
1129 void Interpreter::visitSIToFPInst(SIToFPInst &I) {
1130 ExecutionContext &SF = ECStack.back();
1131 SetValue(&I, executeSIToFPInst(I.getOperand(0), I.getType(), SF), SF);
1134 void Interpreter::visitFPToUIInst(FPToUIInst &I) {
1135 ExecutionContext &SF = ECStack.back();
1136 SetValue(&I, executeFPToUIInst(I.getOperand(0), I.getType(), SF), SF);
1139 void Interpreter::visitFPToSIInst(FPToSIInst &I) {
1140 ExecutionContext &SF = ECStack.back();
1141 SetValue(&I, executeFPToSIInst(I.getOperand(0), I.getType(), SF), SF);
1144 void Interpreter::visitPtrToIntInst(PtrToIntInst &I) {
1145 ExecutionContext &SF = ECStack.back();
1146 SetValue(&I, executePtrToIntInst(I.getOperand(0), I.getType(), SF), SF);
1149 void Interpreter::visitIntToPtrInst(IntToPtrInst &I) {
1150 ExecutionContext &SF = ECStack.back();
1151 SetValue(&I, executeIntToPtrInst(I.getOperand(0), I.getType(), SF), SF);
1154 void Interpreter::visitBitCastInst(BitCastInst &I) {
1155 ExecutionContext &SF = ECStack.back();
1156 SetValue(&I, executeBitCastInst(I.getOperand(0), I.getType(), SF), SF);
1159 #define IMPLEMENT_VAARG(TY) \
1160 case Type::TY##TyID: Dest.TY##Val = Src.TY##Val; break
1162 void Interpreter::visitVAArgInst(VAArgInst &I) {
1163 ExecutionContext &SF = ECStack.back();
1165 // Get the incoming valist parameter. LLI treats the valist as a
1166 // (ec-stack-depth var-arg-index) pair.
1167 GenericValue VAList = getOperandValue(I.getOperand(0), SF);
1169 GenericValue Src = ECStack[VAList.UIntPairVal.first]
1170 .VarArgs[VAList.UIntPairVal.second];
1171 const Type *Ty = I.getType();
1172 switch (Ty->getTypeID()) {
1173 case Type::IntegerTyID: Dest.IntVal = Src.IntVal;
1174 IMPLEMENT_VAARG(Pointer);
1175 IMPLEMENT_VAARG(Float);
1176 IMPLEMENT_VAARG(Double);
1178 cerr << "Unhandled dest type for vaarg instruction: " << *Ty << "\n";
1179 llvm_unreachable(0);
1182 // Set the Value of this Instruction.
1183 SetValue(&I, Dest, SF);
1185 // Move the pointer to the next vararg.
1186 ++VAList.UIntPairVal.second;
1189 GenericValue Interpreter::getConstantExprValue (ConstantExpr *CE,
1190 ExecutionContext &SF) {
1191 switch (CE->getOpcode()) {
1192 case Instruction::Trunc:
1193 return executeTruncInst(CE->getOperand(0), CE->getType(), SF);
1194 case Instruction::ZExt:
1195 return executeZExtInst(CE->getOperand(0), CE->getType(), SF);
1196 case Instruction::SExt:
1197 return executeSExtInst(CE->getOperand(0), CE->getType(), SF);
1198 case Instruction::FPTrunc:
1199 return executeFPTruncInst(CE->getOperand(0), CE->getType(), SF);
1200 case Instruction::FPExt:
1201 return executeFPExtInst(CE->getOperand(0), CE->getType(), SF);
1202 case Instruction::UIToFP:
1203 return executeUIToFPInst(CE->getOperand(0), CE->getType(), SF);
1204 case Instruction::SIToFP:
1205 return executeSIToFPInst(CE->getOperand(0), CE->getType(), SF);
1206 case Instruction::FPToUI:
1207 return executeFPToUIInst(CE->getOperand(0), CE->getType(), SF);
1208 case Instruction::FPToSI:
1209 return executeFPToSIInst(CE->getOperand(0), CE->getType(), SF);
1210 case Instruction::PtrToInt:
1211 return executePtrToIntInst(CE->getOperand(0), CE->getType(), SF);
1212 case Instruction::IntToPtr:
1213 return executeIntToPtrInst(CE->getOperand(0), CE->getType(), SF);
1214 case Instruction::BitCast:
1215 return executeBitCastInst(CE->getOperand(0), CE->getType(), SF);
1216 case Instruction::GetElementPtr:
1217 return executeGEPOperation(CE->getOperand(0), gep_type_begin(CE),
1218 gep_type_end(CE), SF);
1219 case Instruction::FCmp:
1220 case Instruction::ICmp:
1221 return executeCmpInst(CE->getPredicate(),
1222 getOperandValue(CE->getOperand(0), SF),
1223 getOperandValue(CE->getOperand(1), SF),
1224 CE->getOperand(0)->getType());
1225 case Instruction::Select:
1226 return executeSelectInst(getOperandValue(CE->getOperand(0), SF),
1227 getOperandValue(CE->getOperand(1), SF),
1228 getOperandValue(CE->getOperand(2), SF));
1233 // The cases below here require a GenericValue parameter for the result
1234 // so we initialize one, compute it and then return it.
1235 GenericValue Op0 = getOperandValue(CE->getOperand(0), SF);
1236 GenericValue Op1 = getOperandValue(CE->getOperand(1), SF);
1238 const Type * Ty = CE->getOperand(0)->getType();
1239 switch (CE->getOpcode()) {
1240 case Instruction::Add: Dest.IntVal = Op0.IntVal + Op1.IntVal; break;
1241 case Instruction::Sub: Dest.IntVal = Op0.IntVal - Op1.IntVal; break;
1242 case Instruction::Mul: Dest.IntVal = Op0.IntVal * Op1.IntVal; break;
1243 case Instruction::FAdd: executeFAddInst(Dest, Op0, Op1, Ty); break;
1244 case Instruction::FSub: executeFSubInst(Dest, Op0, Op1, Ty); break;
1245 case Instruction::FMul: executeFMulInst(Dest, Op0, Op1, Ty); break;
1246 case Instruction::FDiv: executeFDivInst(Dest, Op0, Op1, Ty); break;
1247 case Instruction::FRem: executeFRemInst(Dest, Op0, Op1, Ty); break;
1248 case Instruction::SDiv: Dest.IntVal = Op0.IntVal.sdiv(Op1.IntVal); break;
1249 case Instruction::UDiv: Dest.IntVal = Op0.IntVal.udiv(Op1.IntVal); break;
1250 case Instruction::URem: Dest.IntVal = Op0.IntVal.urem(Op1.IntVal); break;
1251 case Instruction::SRem: Dest.IntVal = Op0.IntVal.srem(Op1.IntVal); break;
1252 case Instruction::And: Dest.IntVal = Op0.IntVal & Op1.IntVal; break;
1253 case Instruction::Or: Dest.IntVal = Op0.IntVal | Op1.IntVal; break;
1254 case Instruction::Xor: Dest.IntVal = Op0.IntVal ^ Op1.IntVal; break;
1255 case Instruction::Shl:
1256 Dest.IntVal = Op0.IntVal.shl(Op1.IntVal.getZExtValue());
1258 case Instruction::LShr:
1259 Dest.IntVal = Op0.IntVal.lshr(Op1.IntVal.getZExtValue());
1261 case Instruction::AShr:
1262 Dest.IntVal = Op0.IntVal.ashr(Op1.IntVal.getZExtValue());
1265 cerr << "Unhandled ConstantExpr: " << *CE << "\n";
1266 llvm_unreachable(0);
1267 return GenericValue();
1272 GenericValue Interpreter::getOperandValue(Value *V, ExecutionContext &SF) {
1273 if (ConstantExpr *CE = dyn_cast<ConstantExpr>(V)) {
1274 return getConstantExprValue(CE, SF);
1275 } else if (Constant *CPV = dyn_cast<Constant>(V)) {
1276 return getConstantValue(CPV);
1277 } else if (GlobalValue *GV = dyn_cast<GlobalValue>(V)) {
1278 return PTOGV(getPointerToGlobal(GV));
1280 return SF.Values[V];
1284 //===----------------------------------------------------------------------===//
1285 // Dispatch and Execution Code
1286 //===----------------------------------------------------------------------===//
1288 //===----------------------------------------------------------------------===//
1289 // callFunction - Execute the specified function...
1291 void Interpreter::callFunction(Function *F,
1292 const std::vector<GenericValue> &ArgVals) {
1293 assert((ECStack.empty() || ECStack.back().Caller.getInstruction() == 0 ||
1294 ECStack.back().Caller.arg_size() == ArgVals.size()) &&
1295 "Incorrect number of arguments passed into function call!");
1296 // Make a new stack frame... and fill it in.
1297 ECStack.push_back(ExecutionContext());
1298 ExecutionContext &StackFrame = ECStack.back();
1299 StackFrame.CurFunction = F;
1301 // Special handling for external functions.
1302 if (F->isDeclaration()) {
1303 GenericValue Result = callExternalFunction (F, ArgVals);
1304 // Simulate a 'ret' instruction of the appropriate type.
1305 popStackAndReturnValueToCaller (F->getReturnType (), Result);
1309 // Get pointers to first LLVM BB & Instruction in function.
1310 StackFrame.CurBB = F->begin();
1311 StackFrame.CurInst = StackFrame.CurBB->begin();
1313 // Run through the function arguments and initialize their values...
1314 assert((ArgVals.size() == F->arg_size() ||
1315 (ArgVals.size() > F->arg_size() && F->getFunctionType()->isVarArg()))&&
1316 "Invalid number of values passed to function invocation!");
1318 // Handle non-varargs arguments...
1320 for (Function::arg_iterator AI = F->arg_begin(), E = F->arg_end();
1322 SetValue(AI, ArgVals[i], StackFrame);
1324 // Handle varargs arguments...
1325 StackFrame.VarArgs.assign(ArgVals.begin()+i, ArgVals.end());
1329 void Interpreter::run() {
1330 while (!ECStack.empty()) {
1331 // Interpret a single instruction & increment the "PC".
1332 ExecutionContext &SF = ECStack.back(); // Current stack frame
1333 Instruction &I = *SF.CurInst++; // Increment before execute
1335 // Track the number of dynamic instructions executed.
1338 DOUT << "About to interpret: " << I;
1339 visit(I); // Dispatch to one of the visit* methods...
1341 // This is not safe, as visiting the instruction could lower it and free I.
1343 if (!isa<CallInst>(I) && !isa<InvokeInst>(I) &&
1344 I.getType() != Type::VoidTy) {
1346 const GenericValue &Val = SF.Values[&I];
1347 switch (I.getType()->getTypeID()) {
1348 default: llvm_unreachable("Invalid GenericValue Type");
1349 case Type::VoidTyID: DOUT << "void"; break;
1350 case Type::FloatTyID: DOUT << "float " << Val.FloatVal; break;
1351 case Type::DoubleTyID: DOUT << "double " << Val.DoubleVal; break;
1352 case Type::PointerTyID: DOUT << "void* " << intptr_t(Val.PointerVal);
1354 case Type::IntegerTyID:
1355 DOUT << "i" << Val.IntVal.getBitWidth() << " "
1356 << Val.IntVal.toStringUnsigned(10)
1357 << " (0x" << Val.IntVal.toStringUnsigned(16) << ")\n";