//===-- Execution.cpp - Implement code to simulate the program ------------===//
-//
+//
+// The LLVM Compiler Infrastructure
+//
+// This file was developed by the LLVM research group and is distributed under
+// the University of Illinois Open Source License. See LICENSE.TXT for details.
+//
+//===----------------------------------------------------------------------===//
+//
// This file contains the actual instruction interpreter.
//
//===----------------------------------------------------------------------===//
+#define DEBUG_TYPE "interpreter"
#include "Interpreter.h"
-#include "ExecutionAnnotations.h"
-#include "llvm/Module.h"
-#include "llvm/Instructions.h"
-#include "llvm/DerivedTypes.h"
#include "llvm/Constants.h"
-#include "llvm/Assembly/Writer.h"
-#include "Support/CommandLine.h"
-#include "Support/Statistic.h"
-#include <math.h> // For fmod
-#include <signal.h>
-#include <setjmp.h>
-
-Interpreter *TheEE = 0;
+#include "llvm/DerivedTypes.h"
+#include "llvm/Instructions.h"
+#include "llvm/CodeGen/IntrinsicLowering.h"
+#include "llvm/Support/GetElementPtrTypeIterator.h"
+#include "llvm/ADT/Statistic.h"
+#include "llvm/Support/Debug.h"
+#include <cmath> // For fmod
+using namespace llvm;
namespace {
Statistic<> NumDynamicInsts("lli", "Number of dynamic instructions executed");
- cl::opt<bool>
- QuietMode("quiet", cl::desc("Do not emit any non-program output"),
- cl::init(true));
-
- cl::alias
- QuietModeA("q", cl::desc("Alias for -quiet"), cl::aliasopt(QuietMode));
-
- cl::opt<bool>
- ArrayChecksEnabled("array-checks", cl::desc("Enable array bound checks"));
-
- cl::opt<bool>
- AbortOnExceptions("abort-on-exception",
- cl::desc("Halt execution on a machine exception"));
-}
-
-// Create a TargetData structure to handle memory addressing and size/alignment
-// computations
-//
-CachedWriter CW; // Object to accelerate printing of LLVM
-
-#ifdef PROFILE_STRUCTURE_FIELDS
-static cl::opt<bool>
-ProfileStructureFields("profilestructfields",
- cl::desc("Profile Structure Field Accesses"));
-#include <map>
-static std::map<const StructType *, std::vector<unsigned> > FieldAccessCounts;
-#endif
-
-sigjmp_buf SignalRecoverBuffer;
-static bool InInstruction = false;
-
-extern "C" {
-static void SigHandler(int Signal) {
- if (InInstruction)
- siglongjmp(SignalRecoverBuffer, Signal);
-}
-}
-
-static void initializeSignalHandlers() {
- struct sigaction Action;
- Action.sa_handler = SigHandler;
- Action.sa_flags = SA_SIGINFO;
- sigemptyset(&Action.sa_mask);
- sigaction(SIGSEGV, &Action, 0);
- sigaction(SIGBUS, &Action, 0);
- sigaction(SIGINT, &Action, 0);
- sigaction(SIGFPE, &Action, 0);
+ Interpreter *TheEE = 0;
}
// Value Manipulation code
//===----------------------------------------------------------------------===//
-static unsigned getOperandSlot(Value *V) {
- SlotNumber *SN = (SlotNumber*)V->getAnnotation(SlotNumberAID);
- assert(SN && "Operand does not have a slot number annotation!");
- return SN->SlotNum;
+static GenericValue executeAddInst(GenericValue Src1, GenericValue Src2,
+ const Type *Ty);
+static GenericValue executeSubInst(GenericValue Src1, GenericValue Src2,
+ const Type *Ty);
+static GenericValue executeMulInst(GenericValue Src1, GenericValue Src2,
+ const Type *Ty);
+static GenericValue executeRemInst(GenericValue Src1, GenericValue Src2,
+ const Type *Ty);
+static GenericValue executeDivInst(GenericValue Src1, GenericValue Src2,
+ const Type *Ty);
+static GenericValue executeAndInst(GenericValue Src1, GenericValue Src2,
+ const Type *Ty);
+static GenericValue executeOrInst(GenericValue Src1, GenericValue Src2,
+ const Type *Ty);
+static GenericValue executeXorInst(GenericValue Src1, GenericValue Src2,
+ const Type *Ty);
+static GenericValue executeSetEQInst(GenericValue Src1, GenericValue Src2,
+ const Type *Ty);
+static GenericValue executeSetNEInst(GenericValue Src1, GenericValue Src2,
+ const Type *Ty);
+static GenericValue executeSetLTInst(GenericValue Src1, GenericValue Src2,
+ const Type *Ty);
+static GenericValue executeSetGTInst(GenericValue Src1, GenericValue Src2,
+ const Type *Ty);
+static GenericValue executeSetLEInst(GenericValue Src1, GenericValue Src2,
+ const Type *Ty);
+static GenericValue executeSetGEInst(GenericValue Src1, GenericValue Src2,
+ const Type *Ty);
+static GenericValue executeShlInst(GenericValue Src1, GenericValue Src2,
+ const Type *Ty);
+static GenericValue executeShrInst(GenericValue Src1, GenericValue Src2,
+ const Type *Ty);
+static GenericValue executeSelectInst(GenericValue Src1, GenericValue Src2,
+ GenericValue Src3);
+
+GenericValue Interpreter::getConstantExprValue (ConstantExpr *CE,
+ ExecutionContext &SF) {
+ switch (CE->getOpcode()) {
+ case Instruction::Cast:
+ return executeCastOperation(CE->getOperand(0), CE->getType(), SF);
+ case Instruction::GetElementPtr:
+ return executeGEPOperation(CE->getOperand(0), gep_type_begin(CE),
+ gep_type_end(CE), SF);
+ case Instruction::Add:
+ return executeAddInst(getOperandValue(CE->getOperand(0), SF),
+ getOperandValue(CE->getOperand(1), SF),
+ CE->getOperand(0)->getType());
+ case Instruction::Sub:
+ return executeSubInst(getOperandValue(CE->getOperand(0), SF),
+ getOperandValue(CE->getOperand(1), SF),
+ CE->getOperand(0)->getType());
+ case Instruction::Mul:
+ return executeMulInst(getOperandValue(CE->getOperand(0), SF),
+ getOperandValue(CE->getOperand(1), SF),
+ CE->getOperand(0)->getType());
+ case Instruction::Div:
+ return executeDivInst(getOperandValue(CE->getOperand(0), SF),
+ getOperandValue(CE->getOperand(1), SF),
+ CE->getOperand(0)->getType());
+ case Instruction::Rem:
+ return executeRemInst(getOperandValue(CE->getOperand(0), SF),
+ getOperandValue(CE->getOperand(1), SF),
+ CE->getOperand(0)->getType());
+ case Instruction::And:
+ return executeAndInst(getOperandValue(CE->getOperand(0), SF),
+ getOperandValue(CE->getOperand(1), SF),
+ CE->getOperand(0)->getType());
+ case Instruction::Or:
+ return executeOrInst(getOperandValue(CE->getOperand(0), SF),
+ getOperandValue(CE->getOperand(1), SF),
+ CE->getOperand(0)->getType());
+ case Instruction::Xor:
+ return executeXorInst(getOperandValue(CE->getOperand(0), SF),
+ getOperandValue(CE->getOperand(1), SF),
+ CE->getOperand(0)->getType());
+ case Instruction::SetEQ:
+ return executeSetEQInst(getOperandValue(CE->getOperand(0), SF),
+ getOperandValue(CE->getOperand(1), SF),
+ CE->getOperand(0)->getType());
+ case Instruction::SetNE:
+ return executeSetNEInst(getOperandValue(CE->getOperand(0), SF),
+ getOperandValue(CE->getOperand(1), SF),
+ CE->getOperand(0)->getType());
+ case Instruction::SetLE:
+ return executeSetLEInst(getOperandValue(CE->getOperand(0), SF),
+ getOperandValue(CE->getOperand(1), SF),
+ CE->getOperand(0)->getType());
+ case Instruction::SetGE:
+ return executeSetGEInst(getOperandValue(CE->getOperand(0), SF),
+ getOperandValue(CE->getOperand(1), SF),
+ CE->getOperand(0)->getType());
+ case Instruction::SetLT:
+ return executeSetLTInst(getOperandValue(CE->getOperand(0), SF),
+ getOperandValue(CE->getOperand(1), SF),
+ CE->getOperand(0)->getType());
+ case Instruction::SetGT:
+ return executeSetGTInst(getOperandValue(CE->getOperand(0), SF),
+ getOperandValue(CE->getOperand(1), SF),
+ CE->getOperand(0)->getType());
+ case Instruction::Shl:
+ return executeShlInst(getOperandValue(CE->getOperand(0), SF),
+ getOperandValue(CE->getOperand(1), SF),
+ CE->getOperand(0)->getType());
+ case Instruction::Shr:
+ return executeShrInst(getOperandValue(CE->getOperand(0), SF),
+ getOperandValue(CE->getOperand(1), SF),
+ CE->getOperand(0)->getType());
+ case Instruction::Select:
+ return executeSelectInst(getOperandValue(CE->getOperand(0), SF),
+ getOperandValue(CE->getOperand(1), SF),
+ getOperandValue(CE->getOperand(2), SF));
+ default:
+ std::cerr << "Unhandled ConstantExpr: " << *CE << "\n";
+ abort();
+ return GenericValue();
+ }
}
-// Operations used by constant expr implementations...
-static GenericValue executeCastOperation(Value *Src, const Type *DestTy,
- ExecutionContext &SF);
-static GenericValue executeAddInst(GenericValue Src1, GenericValue Src2,
- const Type *Ty);
-
-
-static GenericValue getOperandValue(Value *V, ExecutionContext &SF) {
+GenericValue Interpreter::getOperandValue(Value *V, ExecutionContext &SF) {
if (ConstantExpr *CE = dyn_cast<ConstantExpr>(V)) {
- switch (CE->getOpcode()) {
- case Instruction::Cast:
- return executeCastOperation(CE->getOperand(0), CE->getType(), SF);
- case Instruction::GetElementPtr:
- return TheEE->executeGEPOperation(CE->getOperand(0), CE->op_begin()+1,
- CE->op_end(), SF);
- case Instruction::Add:
- return executeAddInst(getOperandValue(CE->getOperand(0), SF),
- getOperandValue(CE->getOperand(1), SF),
- CE->getType());
- default:
- std::cerr << "Unhandled ConstantExpr: " << CE << "\n";
- abort();
- return GenericValue();
- }
+ return getConstantExprValue(CE, SF);
} else if (Constant *CPV = dyn_cast<Constant>(V)) {
- return TheEE->getConstantValue(CPV);
+ return getConstantValue(CPV);
} else if (GlobalValue *GV = dyn_cast<GlobalValue>(V)) {
- return PTOGV(TheEE->getPointerToGlobal(GV));
- } else {
- unsigned TyP = V->getType()->getUniqueID(); // TypePlane for value
- unsigned OpSlot = getOperandSlot(V);
- assert(TyP < SF.Values.size() &&
- OpSlot < SF.Values[TyP].size() && "Value out of range!");
- return SF.Values[TyP][getOperandSlot(V)];
- }
-}
-
-static void printOperandInfo(Value *V, ExecutionContext &SF) {
- if (isa<Constant>(V)) {
- std::cout << "Constant Pool Value\n";
- } else if (isa<GlobalValue>(V)) {
- std::cout << "Global Value\n";
+ return PTOGV(getPointerToGlobal(GV));
} else {
- unsigned TyP = V->getType()->getUniqueID(); // TypePlane for value
- unsigned Slot = getOperandSlot(V);
- std::cout << "Value=" << (void*)V << " TypeID=" << TyP << " Slot=" << Slot
- << " Addr=" << &SF.Values[TyP][Slot] << " SF=" << &SF
- << " Contents=0x";
-
- const unsigned char *Buf = (const unsigned char*)&SF.Values[TyP][Slot];
- for (unsigned i = 0; i < sizeof(GenericValue); ++i) {
- unsigned char Cur = Buf[i];
- std::cout << ( Cur >= 160?char((Cur>>4)+'A'-10):char((Cur>>4) + '0'))
- << ((Cur&15) >= 10?char((Cur&15)+'A'-10):char((Cur&15) + '0'));
- }
- std::cout << "\n";
+ return SF.Values[V];
}
}
-
-
static void SetValue(Value *V, GenericValue Val, ExecutionContext &SF) {
- unsigned TyP = V->getType()->getUniqueID(); // TypePlane for value
-
- //std::cout << "Setting value: " << &SF.Values[TyP][getOperandSlot(V)]<< "\n";
- SF.Values[TyP][getOperandSlot(V)] = Val;
+ SF.Values[V] = Val;
}
-
-//===----------------------------------------------------------------------===//
-// Annotation Wrangling code
-//===----------------------------------------------------------------------===//
-
void Interpreter::initializeExecutionEngine() {
TheEE = this;
- AnnotationManager::registerAnnotationFactory(FunctionInfoAID,
- &FunctionInfo::Create);
- initializeSignalHandlers();
}
//===----------------------------------------------------------------------===//
#define IMPLEMENT_BINARY_OPERATOR(OP, TY) \
case Type::TY##TyID: Dest.TY##Val = Src1.TY##Val OP Src2.TY##Val; break
-static GenericValue executeAddInst(GenericValue Src1, GenericValue Src2,
- const Type *Ty) {
+static GenericValue executeAddInst(GenericValue Src1, GenericValue Src2,
+ const Type *Ty) {
GenericValue Dest;
- switch (Ty->getPrimitiveID()) {
+ switch (Ty->getTypeID()) {
IMPLEMENT_BINARY_OPERATOR(+, UByte);
IMPLEMENT_BINARY_OPERATOR(+, SByte);
IMPLEMENT_BINARY_OPERATOR(+, UShort);
return Dest;
}
-static GenericValue executeSubInst(GenericValue Src1, GenericValue Src2,
- const Type *Ty) {
+static GenericValue executeSubInst(GenericValue Src1, GenericValue Src2,
+ const Type *Ty) {
GenericValue Dest;
- switch (Ty->getPrimitiveID()) {
+ switch (Ty->getTypeID()) {
IMPLEMENT_BINARY_OPERATOR(-, UByte);
IMPLEMENT_BINARY_OPERATOR(-, SByte);
IMPLEMENT_BINARY_OPERATOR(-, UShort);
return Dest;
}
-static GenericValue executeMulInst(GenericValue Src1, GenericValue Src2,
- const Type *Ty) {
+static GenericValue executeMulInst(GenericValue Src1, GenericValue Src2,
+ const Type *Ty) {
GenericValue Dest;
- switch (Ty->getPrimitiveID()) {
+ switch (Ty->getTypeID()) {
IMPLEMENT_BINARY_OPERATOR(*, UByte);
IMPLEMENT_BINARY_OPERATOR(*, SByte);
IMPLEMENT_BINARY_OPERATOR(*, UShort);
IMPLEMENT_BINARY_OPERATOR(*, Float);
IMPLEMENT_BINARY_OPERATOR(*, Double);
default:
- std::cout << "Unhandled type for Mul instruction: " << Ty << "\n";
+ std::cout << "Unhandled type for Mul instruction: " << *Ty << "\n";
abort();
}
return Dest;
}
-static GenericValue executeDivInst(GenericValue Src1, GenericValue Src2,
- const Type *Ty) {
+static GenericValue executeDivInst(GenericValue Src1, GenericValue Src2,
+ const Type *Ty) {
GenericValue Dest;
- switch (Ty->getPrimitiveID()) {
+ switch (Ty->getTypeID()) {
IMPLEMENT_BINARY_OPERATOR(/, UByte);
IMPLEMENT_BINARY_OPERATOR(/, SByte);
IMPLEMENT_BINARY_OPERATOR(/, UShort);
return Dest;
}
-static GenericValue executeRemInst(GenericValue Src1, GenericValue Src2,
- const Type *Ty) {
+static GenericValue executeRemInst(GenericValue Src1, GenericValue Src2,
+ const Type *Ty) {
GenericValue Dest;
- switch (Ty->getPrimitiveID()) {
+ switch (Ty->getTypeID()) {
IMPLEMENT_BINARY_OPERATOR(%, UByte);
IMPLEMENT_BINARY_OPERATOR(%, SByte);
IMPLEMENT_BINARY_OPERATOR(%, UShort);
return Dest;
}
-static GenericValue executeAndInst(GenericValue Src1, GenericValue Src2,
- const Type *Ty) {
+static GenericValue executeAndInst(GenericValue Src1, GenericValue Src2,
+ const Type *Ty) {
GenericValue Dest;
- switch (Ty->getPrimitiveID()) {
+ switch (Ty->getTypeID()) {
IMPLEMENT_BINARY_OPERATOR(&, Bool);
IMPLEMENT_BINARY_OPERATOR(&, UByte);
IMPLEMENT_BINARY_OPERATOR(&, SByte);
return Dest;
}
-
-static GenericValue executeOrInst(GenericValue Src1, GenericValue Src2,
+static GenericValue executeOrInst(GenericValue Src1, GenericValue Src2,
const Type *Ty) {
GenericValue Dest;
- switch (Ty->getPrimitiveID()) {
+ switch (Ty->getTypeID()) {
IMPLEMENT_BINARY_OPERATOR(|, Bool);
IMPLEMENT_BINARY_OPERATOR(|, UByte);
IMPLEMENT_BINARY_OPERATOR(|, SByte);
return Dest;
}
-
-static GenericValue executeXorInst(GenericValue Src1, GenericValue Src2,
+static GenericValue executeXorInst(GenericValue Src1, GenericValue Src2,
const Type *Ty) {
GenericValue Dest;
- switch (Ty->getPrimitiveID()) {
+ switch (Ty->getTypeID()) {
IMPLEMENT_BINARY_OPERATOR(^, Bool);
IMPLEMENT_BINARY_OPERATOR(^, UByte);
IMPLEMENT_BINARY_OPERATOR(^, SByte);
return Dest;
}
-
#define IMPLEMENT_SETCC(OP, TY) \
case Type::TY##TyID: Dest.BoolVal = Src1.TY##Val OP Src2.TY##Val; break
Dest.BoolVal = (void*)(intptr_t)Src1.PointerVal OP \
(void*)(intptr_t)Src2.PointerVal; break
-static GenericValue executeSetEQInst(GenericValue Src1, GenericValue Src2,
- const Type *Ty) {
+static GenericValue executeSetEQInst(GenericValue Src1, GenericValue Src2,
+ const Type *Ty) {
GenericValue Dest;
- switch (Ty->getPrimitiveID()) {
+ switch (Ty->getTypeID()) {
IMPLEMENT_SETCC(==, UByte);
IMPLEMENT_SETCC(==, SByte);
IMPLEMENT_SETCC(==, UShort);
return Dest;
}
-static GenericValue executeSetNEInst(GenericValue Src1, GenericValue Src2,
- const Type *Ty) {
+static GenericValue executeSetNEInst(GenericValue Src1, GenericValue Src2,
+ const Type *Ty) {
GenericValue Dest;
- switch (Ty->getPrimitiveID()) {
+ switch (Ty->getTypeID()) {
IMPLEMENT_SETCC(!=, UByte);
IMPLEMENT_SETCC(!=, SByte);
IMPLEMENT_SETCC(!=, UShort);
return Dest;
}
-static GenericValue executeSetLEInst(GenericValue Src1, GenericValue Src2,
- const Type *Ty) {
+static GenericValue executeSetLEInst(GenericValue Src1, GenericValue Src2,
+ const Type *Ty) {
GenericValue Dest;
- switch (Ty->getPrimitiveID()) {
+ switch (Ty->getTypeID()) {
IMPLEMENT_SETCC(<=, UByte);
IMPLEMENT_SETCC(<=, SByte);
IMPLEMENT_SETCC(<=, UShort);
IMPLEMENT_SETCC(<=, Double);
IMPLEMENT_POINTERSETCC(<=);
default:
- std::cout << "Unhandled type for SetLE instruction: " << Ty << "\n";
+ std::cout << "Unhandled type for SetLE instruction: " << *Ty << "\n";
abort();
}
return Dest;
}
-static GenericValue executeSetGEInst(GenericValue Src1, GenericValue Src2,
- const Type *Ty) {
+static GenericValue executeSetGEInst(GenericValue Src1, GenericValue Src2,
+ const Type *Ty) {
GenericValue Dest;
- switch (Ty->getPrimitiveID()) {
+ switch (Ty->getTypeID()) {
IMPLEMENT_SETCC(>=, UByte);
IMPLEMENT_SETCC(>=, SByte);
IMPLEMENT_SETCC(>=, UShort);
return Dest;
}
-static GenericValue executeSetLTInst(GenericValue Src1, GenericValue Src2,
- const Type *Ty) {
+static GenericValue executeSetLTInst(GenericValue Src1, GenericValue Src2,
+ const Type *Ty) {
GenericValue Dest;
- switch (Ty->getPrimitiveID()) {
+ switch (Ty->getTypeID()) {
IMPLEMENT_SETCC(<, UByte);
IMPLEMENT_SETCC(<, SByte);
IMPLEMENT_SETCC(<, UShort);
return Dest;
}
-static GenericValue executeSetGTInst(GenericValue Src1, GenericValue Src2,
- const Type *Ty) {
+static GenericValue executeSetGTInst(GenericValue Src1, GenericValue Src2,
+ const Type *Ty) {
GenericValue Dest;
- switch (Ty->getPrimitiveID()) {
+ switch (Ty->getTypeID()) {
IMPLEMENT_SETCC(>, UByte);
IMPLEMENT_SETCC(>, SByte);
IMPLEMENT_SETCC(>, UShort);
return Dest;
}
-static void executeBinaryInst(BinaryOperator &I, ExecutionContext &SF) {
+void Interpreter::visitBinaryOperator(BinaryOperator &I) {
+ ExecutionContext &SF = ECStack.back();
const Type *Ty = I.getOperand(0)->getType();
GenericValue Src1 = getOperandValue(I.getOperand(0), SF);
GenericValue Src2 = getOperandValue(I.getOperand(1), SF);
SetValue(&I, R, SF);
}
+static GenericValue executeSelectInst(GenericValue Src1, GenericValue Src2,
+ GenericValue Src3) {
+ return Src1.BoolVal ? Src2 : Src3;
+}
+
+void Interpreter::visitSelectInst(SelectInst &I) {
+ ExecutionContext &SF = ECStack.back();
+ GenericValue Src1 = getOperandValue(I.getOperand(0), SF);
+ GenericValue Src2 = getOperandValue(I.getOperand(1), SF);
+ GenericValue Src3 = getOperandValue(I.getOperand(2), SF);
+ GenericValue R = executeSelectInst(Src1, Src2, Src3);
+ SetValue(&I, R, SF);
+}
+
+
//===----------------------------------------------------------------------===//
// Terminator Instruction Implementations
//===----------------------------------------------------------------------===//
-static void PerformExitStuff() {
-#ifdef PROFILE_STRUCTURE_FIELDS
- // Print out structure field accounting information...
- if (!FieldAccessCounts.empty()) {
- CW << "Profile Field Access Counts:\n";
- std::map<const StructType *, std::vector<unsigned> >::iterator
- I = FieldAccessCounts.begin(), E = FieldAccessCounts.end();
- for (; I != E; ++I) {
- std::vector<unsigned> &OfC = I->second;
- CW << " '" << (Value*)I->first << "'\t- Sum=";
-
- unsigned Sum = 0;
- for (unsigned i = 0; i < OfC.size(); ++i)
- Sum += OfC[i];
- CW << Sum << " - ";
-
- for (unsigned i = 0; i < OfC.size(); ++i) {
- if (i) CW << ", ";
- CW << OfC[i];
- }
- CW << "\n";
- }
- CW << "\n";
-
- CW << "Profile Field Access Percentages:\n";
- std::cout.precision(3);
- for (I = FieldAccessCounts.begin(); I != E; ++I) {
- std::vector<unsigned> &OfC = I->second;
- unsigned Sum = 0;
- for (unsigned i = 0; i < OfC.size(); ++i)
- Sum += OfC[i];
-
- CW << " '" << (Value*)I->first << "'\t- ";
- for (unsigned i = 0; i < OfC.size(); ++i) {
- if (i) CW << ", ";
- CW << double(OfC[i])/Sum;
- }
- CW << "\n";
- }
- CW << "\n";
-
- FieldAccessCounts.clear();
- }
-#endif
+void Interpreter::exitCalled(GenericValue GV) {
+ // runAtExitHandlers() assumes there are no stack frames, but
+ // if exit() was called, then it had a stack frame. Blow away
+ // the stack before interpreting atexit handlers.
+ ECStack.clear ();
+ runAtExitHandlers ();
+ exit (GV.IntVal);
}
-void Interpreter::exitCalled(GenericValue GV) {
- if (!QuietMode) {
- std::cout << "Program returned ";
- print(Type::IntTy, GV);
- std::cout << " via 'void exit(int)'\n";
- }
+/// Pop the last stack frame off of ECStack and then copy the result
+/// back into the result variable if we are not returning void. The
+/// result variable may be the ExitValue, or the Value of the calling
+/// CallInst if there was a previous stack frame. This method may
+/// invalidate any ECStack iterators you have. This method also takes
+/// care of switching to the normal destination BB, if we are returning
+/// from an invoke.
+///
+void Interpreter::popStackAndReturnValueToCaller (const Type *RetTy,
+ GenericValue Result) {
+ // Pop the current stack frame.
+ ECStack.pop_back();
- ExitCode = GV.SByteVal;
- ECStack.clear();
- PerformExitStuff();
+ if (ECStack.empty()) { // Finished main. Put result into exit code...
+ if (RetTy && RetTy->isIntegral()) { // Nonvoid return type?
+ ExitValue = Result; // Capture the exit value of the program
+ } else {
+ memset(&ExitValue, 0, sizeof(ExitValue));
+ }
+ } else {
+ // If we have a previous stack frame, and we have a previous call,
+ // fill in the return value...
+ ExecutionContext &CallingSF = ECStack.back();
+ if (Instruction *I = CallingSF.Caller.getInstruction()) {
+ if (CallingSF.Caller.getType() != Type::VoidTy) // Save result...
+ SetValue(I, Result, CallingSF);
+ if (InvokeInst *II = dyn_cast<InvokeInst> (I))
+ SwitchToNewBasicBlock (II->getNormalDest (), CallingSF);
+ CallingSF.Caller = CallSite(); // We returned from the call...
+ }
+ }
}
-void Interpreter::executeRetInst(ReturnInst &I, ExecutionContext &SF) {
- const Type *RetTy = 0;
+void Interpreter::visitReturnInst(ReturnInst &I) {
+ ExecutionContext &SF = ECStack.back();
+ const Type *RetTy = Type::VoidTy;
GenericValue Result;
// Save away the return value... (if we are not 'ret void')
Result = getOperandValue(I.getReturnValue(), SF);
}
- // Save previously executing meth
- const Function *M = ECStack.back().CurFunction;
-
- // Pop the current stack frame... this invalidates SF
- ECStack.pop_back();
-
- if (ECStack.empty()) { // Finished main. Put result into exit code...
- if (RetTy) { // Nonvoid return type?
- if (!QuietMode) {
- CW << "Function " << M->getType() << " \"" << M->getName()
- << "\" returned ";
- print(RetTy, Result);
- std::cout << "\n";
- }
-
- if (RetTy->isIntegral())
- ExitCode = Result.IntVal; // Capture the exit code of the program
- } else {
- ExitCode = 0;
- }
+ popStackAndReturnValueToCaller(RetTy, Result);
+}
- PerformExitStuff();
- return;
- }
+void Interpreter::visitUnwindInst(UnwindInst &I) {
+ // Unwind stack
+ Instruction *Inst;
+ do {
+ ECStack.pop_back ();
+ if (ECStack.empty ())
+ abort ();
+ Inst = ECStack.back ().Caller.getInstruction ();
+ } while (!(Inst && isa<InvokeInst> (Inst)));
+
+ // Return from invoke
+ ExecutionContext &InvokingSF = ECStack.back ();
+ InvokingSF.Caller = CallSite ();
+
+ // Go to exceptional destination BB of invoke instruction
+ SwitchToNewBasicBlock(cast<InvokeInst>(Inst)->getUnwindDest(), InvokingSF);
+}
- // If we have a previous stack frame, and we have a previous call, fill in
- // the return value...
- //
- ExecutionContext &NewSF = ECStack.back();
- if (NewSF.Caller) {
- if (NewSF.Caller->getType() != Type::VoidTy) // Save result...
- SetValue(NewSF.Caller, Result, NewSF);
-
- NewSF.Caller = 0; // We returned from the call...
- } else if (!QuietMode) {
- // This must be a function that is executing because of a user 'call'
- // instruction.
- CW << "Function " << M->getType() << " \"" << M->getName()
- << "\" returned ";
- print(RetTy, Result);
- std::cout << "\n";
- }
+void Interpreter::visitUnreachableInst(UnreachableInst &I) {
+ std::cerr << "ERROR: Program executed an 'unreachable' instruction!\n";
+ abort();
}
-void Interpreter::executeBrInst(BranchInst &I, ExecutionContext &SF) {
- SF.PrevBB = SF.CurBB; // Update PrevBB so that PHI nodes work...
+void Interpreter::visitBranchInst(BranchInst &I) {
+ ExecutionContext &SF = ECStack.back();
BasicBlock *Dest;
Dest = I.getSuccessor(0); // Uncond branches have a fixed dest...
if (!I.isUnconditional()) {
Value *Cond = I.getCondition();
- GenericValue CondVal = getOperandValue(Cond, SF);
- if (CondVal.BoolVal == 0) // If false cond...
- Dest = I.getSuccessor(1);
+ if (getOperandValue(Cond, SF).BoolVal == 0) // If false cond...
+ Dest = I.getSuccessor(1);
}
- SF.CurBB = Dest; // Update CurBB to branch destination
- SF.CurInst = SF.CurBB->begin(); // Update new instruction ptr...
+ SwitchToNewBasicBlock(Dest, SF);
}
-static void executeSwitch(SwitchInst &I, ExecutionContext &SF) {
+void Interpreter::visitSwitchInst(SwitchInst &I) {
+ ExecutionContext &SF = ECStack.back();
GenericValue CondVal = getOperandValue(I.getOperand(0), SF);
const Type *ElTy = I.getOperand(0)->getType();
- SF.PrevBB = SF.CurBB; // Update PrevBB so that PHI nodes work...
- BasicBlock *Dest = 0;
// Check to see if any of the cases match...
- for (unsigned i = 2, e = I.getNumOperands(); i != e; i += 2) {
+ BasicBlock *Dest = 0;
+ for (unsigned i = 2, e = I.getNumOperands(); i != e; i += 2)
if (executeSetEQInst(CondVal,
getOperandValue(I.getOperand(i), SF), ElTy).BoolVal) {
Dest = cast<BasicBlock>(I.getOperand(i+1));
break;
}
- }
-
+
if (!Dest) Dest = I.getDefaultDest(); // No cases matched: use default
- SF.CurBB = Dest; // Update CurBB to branch destination
- SF.CurInst = SF.CurBB->begin(); // Update new instruction ptr...
+ SwitchToNewBasicBlock(Dest, SF);
}
+// SwitchToNewBasicBlock - This method is used to jump to a new basic block.
+// This function handles the actual updating of block and instruction iterators
+// as well as execution of all of the PHI nodes in the destination block.
+//
+// This method does this because all of the PHI nodes must be executed
+// atomically, reading their inputs before any of the results are updated. Not
+// doing this can cause problems if the PHI nodes depend on other PHI nodes for
+// their inputs. If the input PHI node is updated before it is read, incorrect
+// results can happen. Thus we use a two phase approach.
+//
+void Interpreter::SwitchToNewBasicBlock(BasicBlock *Dest, ExecutionContext &SF){
+ BasicBlock *PrevBB = SF.CurBB; // Remember where we came from...
+ SF.CurBB = Dest; // Update CurBB to branch destination
+ SF.CurInst = SF.CurBB->begin(); // Update new instruction ptr...
+
+ if (!isa<PHINode>(SF.CurInst)) return; // Nothing fancy to do
+
+ // Loop over all of the PHI nodes in the current block, reading their inputs.
+ std::vector<GenericValue> ResultValues;
+
+ for (; PHINode *PN = dyn_cast<PHINode>(SF.CurInst); ++SF.CurInst) {
+ // Search for the value corresponding to this previous bb...
+ int i = PN->getBasicBlockIndex(PrevBB);
+ assert(i != -1 && "PHINode doesn't contain entry for predecessor??");
+ Value *IncomingValue = PN->getIncomingValue(i);
+
+ // Save the incoming value for this PHI node...
+ ResultValues.push_back(getOperandValue(IncomingValue, SF));
+ }
+
+ // Now loop over all of the PHI nodes setting their values...
+ SF.CurInst = SF.CurBB->begin();
+ for (unsigned i = 0; isa<PHINode>(SF.CurInst); ++SF.CurInst, ++i) {
+ PHINode *PN = cast<PHINode>(SF.CurInst);
+ SetValue(PN, ResultValues[i], SF);
+ }
+}
//===----------------------------------------------------------------------===//
// Memory Instruction Implementations
//===----------------------------------------------------------------------===//
-void Interpreter::executeAllocInst(AllocationInst &I, ExecutionContext &SF) {
+void Interpreter::visitAllocationInst(AllocationInst &I) {
+ ExecutionContext &SF = ECStack.back();
+
const Type *Ty = I.getType()->getElementType(); // Type to be allocated
// Get the number of elements being allocated by the array...
unsigned NumElements = getOperandValue(I.getOperand(0), SF).UIntVal;
// Allocate enough memory to hold the type...
- // FIXME: Don't use CALLOC, use a tainted malloc.
- void *Memory = calloc(NumElements, TD.getTypeSize(Ty));
+ void *Memory = malloc(NumElements * (size_t)TD.getTypeSize(Ty));
GenericValue Result = PTOGV(Memory);
assert(Result.PointerVal != 0 && "Null pointer returned by malloc!");
ECStack.back().Allocas.add(Memory);
}
-static void executeFreeInst(FreeInst &I, ExecutionContext &SF) {
+void Interpreter::visitFreeInst(FreeInst &I) {
+ ExecutionContext &SF = ECStack.back();
assert(isa<PointerType>(I.getOperand(0)->getType()) && "Freeing nonptr?");
GenericValue Value = getOperandValue(I.getOperand(0), SF);
// TODO: Check to make sure memory is allocated
free(GVTOP(Value)); // Free memory
}
-
// getElementOffset - The workhorse for getelementptr.
//
-GenericValue Interpreter::executeGEPOperation(Value *Ptr, User::op_iterator I,
- User::op_iterator E,
- ExecutionContext &SF) {
+GenericValue Interpreter::executeGEPOperation(Value *Ptr, gep_type_iterator I,
+ gep_type_iterator E,
+ ExecutionContext &SF) {
assert(isa<PointerType>(Ptr->getType()) &&
"Cannot getElementOffset of a nonpointer type!");
PointerTy Total = 0;
- const Type *Ty = Ptr->getType();
for (; I != E; ++I) {
- if (const StructType *STy = dyn_cast<StructType>(Ty)) {
+ if (const StructType *STy = dyn_cast<StructType>(*I)) {
const StructLayout *SLO = TD.getStructLayout(STy);
-
- // Indicies must be ubyte constants...
- const ConstantUInt *CPU = cast<ConstantUInt>(*I);
- assert(CPU->getType() == Type::UByteTy);
- unsigned Index = CPU->getValue();
-
-#ifdef PROFILE_STRUCTURE_FIELDS
- if (ProfileStructureFields) {
- // Do accounting for this field...
- std::vector<unsigned> &OfC = FieldAccessCounts[STy];
- if (OfC.size() == 0) OfC.resize(STy->getElementTypes().size());
- OfC[Index]++;
- }
-#endif
-
- Total += SLO->MemberOffsets[Index];
- Ty = STy->getElementTypes()[Index];
- } else if (const SequentialType *ST = cast<SequentialType>(Ty)) {
+ const ConstantInt *CPU = cast<ConstantInt>(I.getOperand());
+ unsigned Index = unsigned(CPU->getZExtValue());
+
+ Total += (PointerTy)SLO->MemberOffsets[Index];
+ } else {
+ const SequentialType *ST = cast<SequentialType>(*I);
// Get the index number for the array... which must be long type...
- assert((*I)->getType() == Type::LongTy);
- unsigned Idx = getOperandValue(*I, SF).LongVal;
- if (const ArrayType *AT = dyn_cast<ArrayType>(ST))
- if (Idx >= AT->getNumElements() && ArrayChecksEnabled) {
- std::cerr << "Out of range memory access to element #" << Idx
- << " of a " << AT->getNumElements() << " element array."
- << " Subscript #" << *I << "\n";
- // Get outta here!!!
- siglongjmp(SignalRecoverBuffer, SIGTRAP);
- }
-
- Ty = ST->getElementType();
- unsigned Size = TD.getTypeSize(Ty);
- Total += Size*Idx;
- }
+ GenericValue IdxGV = getOperandValue(I.getOperand(), SF);
+
+ uint64_t Idx;
+ switch (I.getOperand()->getType()->getTypeID()) {
+ default: assert(0 && "Illegal getelementptr index for sequential type!");
+ case Type::SByteTyID: Idx = IdxGV.SByteVal; break;
+ case Type::ShortTyID: Idx = IdxGV.ShortVal; break;
+ case Type::IntTyID: Idx = IdxGV.IntVal; break;
+ case Type::LongTyID: Idx = IdxGV.LongVal; break;
+ case Type::UByteTyID: Idx = IdxGV.UByteVal; break;
+ case Type::UShortTyID: Idx = IdxGV.UShortVal; break;
+ case Type::UIntTyID: Idx = IdxGV.UIntVal; break;
+ case Type::ULongTyID: Idx = IdxGV.ULongVal; break;
+ }
+ Total += PointerTy(TD.getTypeSize(ST->getElementType())*Idx);
+ }
}
GenericValue Result;
return Result;
}
-static void executeGEPInst(GetElementPtrInst &I, ExecutionContext &SF) {
+void Interpreter::visitGetElementPtrInst(GetElementPtrInst &I) {
+ ExecutionContext &SF = ECStack.back();
SetValue(&I, TheEE->executeGEPOperation(I.getPointerOperand(),
- I.idx_begin(), I.idx_end(), SF), SF);
+ gep_type_begin(I), gep_type_end(I), SF), SF);
}
-void Interpreter::executeLoadInst(LoadInst &I, ExecutionContext &SF) {
+void Interpreter::visitLoadInst(LoadInst &I) {
+ ExecutionContext &SF = ECStack.back();
GenericValue SRC = getOperandValue(I.getPointerOperand(), SF);
GenericValue *Ptr = (GenericValue*)GVTOP(SRC);
GenericValue Result = LoadValueFromMemory(Ptr, I.getType());
SetValue(&I, Result, SF);
}
-void Interpreter::executeStoreInst(StoreInst &I, ExecutionContext &SF) {
+void Interpreter::visitStoreInst(StoreInst &I) {
+ ExecutionContext &SF = ECStack.back();
GenericValue Val = getOperandValue(I.getOperand(0), SF);
GenericValue SRC = getOperandValue(I.getPointerOperand(), SF);
StoreValueToMemory(Val, (GenericValue *)GVTOP(SRC),
I.getOperand(0)->getType());
}
-
-
//===----------------------------------------------------------------------===//
// Miscellaneous Instruction Implementations
//===----------------------------------------------------------------------===//
-void Interpreter::executeCallInst(CallInst &I, ExecutionContext &SF) {
- ECStack.back().Caller = &I;
+void Interpreter::visitCallSite(CallSite CS) {
+ ExecutionContext &SF = ECStack.back();
+
+ // Check to see if this is an intrinsic function call...
+ if (Function *F = CS.getCalledFunction())
+ if (F->isExternal ())
+ switch (F->getIntrinsicID()) {
+ case Intrinsic::not_intrinsic:
+ break;
+ case Intrinsic::vastart: { // va_start
+ GenericValue ArgIndex;
+ ArgIndex.UIntPairVal.first = ECStack.size() - 1;
+ ArgIndex.UIntPairVal.second = 0;
+ SetValue(CS.getInstruction(), ArgIndex, SF);
+ return;
+ }
+ case Intrinsic::vaend: // va_end is a noop for the interpreter
+ return;
+ case Intrinsic::vacopy: // va_copy: dest = src
+ SetValue(CS.getInstruction(), getOperandValue(*CS.arg_begin(), SF), SF);
+ return;
+ default:
+ // If it is an unknown intrinsic function, use the intrinsic lowering
+ // class to transform it into hopefully tasty LLVM code.
+ //
+ Instruction *Prev = CS.getInstruction()->getPrev();
+ BasicBlock *Parent = CS.getInstruction()->getParent();
+ IL->LowerIntrinsicCall(cast<CallInst>(CS.getInstruction()));
+
+ // Restore the CurInst pointer to the first instruction newly inserted, if
+ // any.
+ if (!Prev) {
+ SF.CurInst = Parent->begin();
+ } else {
+ SF.CurInst = Prev;
+ ++SF.CurInst;
+ }
+ return;
+ }
+
+ SF.Caller = CS;
std::vector<GenericValue> ArgVals;
- ArgVals.reserve(I.getNumOperands()-1);
- for (unsigned i = 1; i < I.getNumOperands(); ++i) {
- ArgVals.push_back(getOperandValue(I.getOperand(i), SF));
+ const unsigned NumArgs = SF.Caller.arg_size();
+ ArgVals.reserve(NumArgs);
+ for (CallSite::arg_iterator i = SF.Caller.arg_begin(),
+ e = SF.Caller.arg_end(); i != e; ++i) {
+ Value *V = *i;
+ ArgVals.push_back(getOperandValue(V, SF));
// Promote all integral types whose size is < sizeof(int) into ints. We do
// this by zero or sign extending the value as appropriate according to the
// source type.
- if (I.getOperand(i)->getType()->isIntegral() &&
- I.getOperand(i)->getType()->getPrimitiveSize() < 4) {
- const Type *Ty = I.getOperand(i)->getType();
+ const Type *Ty = V->getType();
+ if (Ty->isIntegral() && Ty->getPrimitiveSize() < 4) {
if (Ty == Type::ShortTy)
- ArgVals.back().IntVal = ArgVals.back().ShortVal;
+ ArgVals.back().IntVal = ArgVals.back().ShortVal;
else if (Ty == Type::UShortTy)
- ArgVals.back().UIntVal = ArgVals.back().UShortVal;
+ ArgVals.back().UIntVal = ArgVals.back().UShortVal;
else if (Ty == Type::SByteTy)
- ArgVals.back().IntVal = ArgVals.back().SByteVal;
+ ArgVals.back().IntVal = ArgVals.back().SByteVal;
else if (Ty == Type::UByteTy)
- ArgVals.back().UIntVal = ArgVals.back().UByteVal;
+ ArgVals.back().UIntVal = ArgVals.back().UByteVal;
else if (Ty == Type::BoolTy)
- ArgVals.back().UIntVal = ArgVals.back().BoolVal;
+ ArgVals.back().UIntVal = ArgVals.back().BoolVal;
else
- assert(0 && "Unknown type!");
+ assert(0 && "Unknown type!");
}
}
- // To handle indirect calls, we must get the pointer value from the argument
+ // To handle indirect calls, we must get the pointer value from the argument
// and treat it as a function pointer.
- GenericValue SRC = getOperandValue(I.getCalledValue(), SF);
-
+ GenericValue SRC = getOperandValue(SF.Caller.getCalledValue(), SF);
callFunction((Function*)GVTOP(SRC), ArgVals);
}
-static void executePHINode(PHINode &I, ExecutionContext &SF) {
- BasicBlock *PrevBB = SF.PrevBB;
- Value *IncomingValue = 0;
-
- // Search for the value corresponding to this previous bb...
- for (unsigned i = I.getNumIncomingValues(); i > 0;) {
- if (I.getIncomingBlock(--i) == PrevBB) {
- IncomingValue = I.getIncomingValue(i);
- break;
- }
- }
- assert(IncomingValue && "No PHI node predecessor for current PrevBB!");
-
- // Found the value, set as the result...
- SetValue(&I, getOperandValue(IncomingValue, SF), SF);
-}
-
#define IMPLEMENT_SHIFT(OP, TY) \
case Type::TY##TyID: Dest.TY##Val = Src1.TY##Val OP Src2.UByteVal; break
-static void executeShlInst(ShiftInst &I, ExecutionContext &SF) {
- const Type *Ty = I.getOperand(0)->getType();
- GenericValue Src1 = getOperandValue(I.getOperand(0), SF);
- GenericValue Src2 = getOperandValue(I.getOperand(1), SF);
+static GenericValue executeShlInst(GenericValue Src1, GenericValue Src2,
+ const Type *Ty) {
GenericValue Dest;
-
- switch (Ty->getPrimitiveID()) {
+ switch (Ty->getTypeID()) {
IMPLEMENT_SHIFT(<<, UByte);
IMPLEMENT_SHIFT(<<, SByte);
IMPLEMENT_SHIFT(<<, UShort);
default:
std::cout << "Unhandled type for Shl instruction: " << *Ty << "\n";
}
- SetValue(&I, Dest, SF);
+ return Dest;
}
-static void executeShrInst(ShiftInst &I, ExecutionContext &SF) {
- const Type *Ty = I.getOperand(0)->getType();
- GenericValue Src1 = getOperandValue(I.getOperand(0), SF);
- GenericValue Src2 = getOperandValue(I.getOperand(1), SF);
+static GenericValue executeShrInst(GenericValue Src1, GenericValue Src2,
+ const Type *Ty) {
GenericValue Dest;
-
- switch (Ty->getPrimitiveID()) {
+ switch (Ty->getTypeID()) {
IMPLEMENT_SHIFT(>>, UByte);
IMPLEMENT_SHIFT(>>, SByte);
IMPLEMENT_SHIFT(>>, UShort);
std::cout << "Unhandled type for Shr instruction: " << *Ty << "\n";
abort();
}
+ return Dest;
+}
+
+void Interpreter::visitShl(ShiftInst &I) {
+ ExecutionContext &SF = ECStack.back();
+ const Type *Ty = I.getOperand(0)->getType();
+ GenericValue Src1 = getOperandValue(I.getOperand(0), SF);
+ GenericValue Src2 = getOperandValue(I.getOperand(1), SF);
+ GenericValue Dest;
+ Dest = executeShlInst (Src1, Src2, Ty);
+ SetValue(&I, Dest, SF);
+}
+
+void Interpreter::visitShr(ShiftInst &I) {
+ ExecutionContext &SF = ECStack.back();
+ const Type *Ty = I.getOperand(0)->getType();
+ GenericValue Src1 = getOperandValue(I.getOperand(0), SF);
+ GenericValue Src2 = getOperandValue(I.getOperand(1), SF);
+ GenericValue Dest;
+ Dest = executeShrInst (Src1, Src2, Ty);
SetValue(&I, Dest, SF);
}
#define IMPLEMENT_CAST_CASE_START(DESTTY, DESTCTY) \
case Type::DESTTY##TyID: \
- switch (SrcTy->getPrimitiveID()) { \
+ switch (SrcTy->getTypeID()) { \
IMPLEMENT_CAST(DESTTY, DESTCTY, Bool); \
IMPLEMENT_CAST(DESTTY, DESTCTY, UByte); \
IMPLEMENT_CAST(DESTTY, DESTCTY, SByte); \
IMPLEMENT_CAST(DESTTY, DESTCTY, Double)
#define IMPLEMENT_CAST_CASE_END() \
- default: std::cout << "Unhandled cast: " << SrcTy << " to " << Ty << "\n"; \
+ default: std::cout << "Unhandled cast: " << *SrcTy << " to " << *Ty << "\n"; \
abort(); \
} \
break
IMPLEMENT_CAST_CASE_FP_IMP(DESTTY, DESTCTY); \
IMPLEMENT_CAST_CASE_END()
-static GenericValue executeCastOperation(Value *SrcVal, const Type *Ty,
- ExecutionContext &SF) {
+GenericValue Interpreter::executeCastOperation(Value *SrcVal, const Type *Ty,
+ ExecutionContext &SF) {
const Type *SrcTy = SrcVal->getType();
GenericValue Dest, Src = getOperandValue(SrcVal, SF);
- switch (Ty->getPrimitiveID()) {
+ switch (Ty->getTypeID()) {
IMPLEMENT_CAST_CASE(UByte , (unsigned char));
IMPLEMENT_CAST_CASE(SByte , ( signed char));
IMPLEMENT_CAST_CASE(UShort , (unsigned short));
return Dest;
}
-
-static void executeCastInst(CastInst &I, ExecutionContext &SF) {
+void Interpreter::visitCastInst(CastInst &I) {
+ ExecutionContext &SF = ECStack.back();
SetValue(&I, executeCastOperation(I.getOperand(0), I.getType(), SF), SF);
}
-static void executeVarArgInst(VarArgInst &I, ExecutionContext &SF) {
- // Get the pointer to the valist element. LLI treats the valist in memory as
- // an integer.
- GenericValue VAListPtr = getOperandValue(I.getOperand(0), SF);
+#define IMPLEMENT_VAARG(TY) \
+ case Type::TY##TyID: Dest.TY##Val = Src.TY##Val; break
- // Load the pointer
- GenericValue VAList =
- TheEE->LoadValueFromMemory((GenericValue *)GVTOP(VAListPtr), Type::UIntTy);
+void Interpreter::visitVAArgInst(VAArgInst &I) {
+ ExecutionContext &SF = ECStack.back();
- unsigned Argument = VAList.IntVal++;
+ // Get the incoming valist parameter. LLI treats the valist as a
+ // (ec-stack-depth var-arg-index) pair.
+ GenericValue VAList = getOperandValue(I.getOperand(0), SF);
+ GenericValue Dest;
+ GenericValue Src = ECStack[VAList.UIntPairVal.first]
+ .VarArgs[VAList.UIntPairVal.second];
+ const Type *Ty = I.getType();
+ switch (Ty->getTypeID()) {
+ IMPLEMENT_VAARG(UByte);
+ IMPLEMENT_VAARG(SByte);
+ IMPLEMENT_VAARG(UShort);
+ IMPLEMENT_VAARG(Short);
+ IMPLEMENT_VAARG(UInt);
+ IMPLEMENT_VAARG(Int);
+ IMPLEMENT_VAARG(ULong);
+ IMPLEMENT_VAARG(Long);
+ IMPLEMENT_VAARG(Pointer);
+ IMPLEMENT_VAARG(Float);
+ IMPLEMENT_VAARG(Double);
+ IMPLEMENT_VAARG(Bool);
+ default:
+ std::cout << "Unhandled dest type for vaarg instruction: " << *Ty << "\n";
+ abort();
+ }
- // Update the valist to point to the next argument...
- TheEE->StoreValueToMemory(VAList, (GenericValue *)GVTOP(VAListPtr),
- Type::UIntTy);
+ // Set the Value of this Instruction.
+ SetValue(&I, Dest, SF);
- // Set the value...
- assert(Argument < SF.VarArgs.size() &&
- "Accessing past the last vararg argument!");
- SetValue(&I, SF.VarArgs[Argument], SF);
+ // Move the pointer to the next vararg.
+ ++VAList.UIntPairVal.second;
}
//===----------------------------------------------------------------------===//
// Dispatch and Execution Code
//===----------------------------------------------------------------------===//
-FunctionInfo::FunctionInfo(Function *F) : Annotation(FunctionInfoAID) {
- // Assign slot numbers to the function arguments...
- for (Function::const_aiterator AI = F->abegin(), E = F->aend(); AI != E; ++AI)
- AI->addAnnotation(new SlotNumber(getValueSlot(AI)));
-
- // Iterate over all of the instructions...
- unsigned InstNum = 0;
- for (Function::iterator BB = F->begin(), BBE = F->end(); BB != BBE; ++BB)
- for (BasicBlock::iterator II = BB->begin(), IE = BB->end(); II != IE; ++II)
- // For each instruction... Add Annote
- II->addAnnotation(new InstNumber(++InstNum, getValueSlot(II)));
-}
-
-unsigned FunctionInfo::getValueSlot(const Value *V) {
- unsigned Plane = V->getType()->getUniqueID();
- if (Plane >= NumPlaneElements.size())
- NumPlaneElements.resize(Plane+1, 0);
- return NumPlaneElements[Plane]++;
-}
-
-
//===----------------------------------------------------------------------===//
// callFunction - Execute the specified function...
//
void Interpreter::callFunction(Function *F,
const std::vector<GenericValue> &ArgVals) {
- assert((ECStack.empty() || ECStack.back().Caller == 0 ||
- ECStack.back().Caller->getNumOperands()-1 == ArgVals.size()) &&
- "Incorrect number of arguments passed into function call!");
- if (F->isExternal()) {
- GenericValue Result = callExternalFunction(F, ArgVals);
- const Type *RetTy = F->getReturnType();
-
- // Copy the result back into the result variable if we are not returning
- // void.
- if (RetTy != Type::VoidTy) {
- if (!ECStack.empty() && ECStack.back().Caller) {
- ExecutionContext &SF = ECStack.back();
- SetValue(SF.Caller, Result, SF);
-
- SF.Caller = 0; // We returned from the call...
- } else if (!QuietMode) {
- // print it.
- CW << "Function " << F->getType() << " \"" << F->getName()
- << "\" returned ";
- print(RetTy, Result);
- std::cout << "\n";
-
- if (RetTy->isIntegral())
- ExitCode = Result.IntVal; // Capture the exit code of the program
- }
- }
+ assert((ECStack.empty() || ECStack.back().Caller.getInstruction() == 0 ||
+ ECStack.back().Caller.arg_size() == ArgVals.size()) &&
+ "Incorrect number of arguments passed into function call!");
+ // Make a new stack frame... and fill it in.
+ ECStack.push_back(ExecutionContext());
+ ExecutionContext &StackFrame = ECStack.back();
+ StackFrame.CurFunction = F;
+ // Special handling for external functions.
+ if (F->isExternal()) {
+ GenericValue Result = callExternalFunction (F, ArgVals);
+ // Simulate a 'ret' instruction of the appropriate type.
+ popStackAndReturnValueToCaller (F->getReturnType (), Result);
return;
}
- // Process the function, assigning instruction numbers to the instructions in
- // the function. Also calculate the number of values for each type slot
- // active.
- //
- FunctionInfo *FuncInfo =
- (FunctionInfo*)F->getOrCreateAnnotation(FunctionInfoAID);
- ECStack.push_back(ExecutionContext()); // Make a new stack frame...
-
- ExecutionContext &StackFrame = ECStack.back(); // Fill it in...
- StackFrame.CurFunction = F;
+ // Get pointers to first LLVM BB & Instruction in function.
StackFrame.CurBB = F->begin();
StackFrame.CurInst = StackFrame.CurBB->begin();
- StackFrame.FuncInfo = FuncInfo;
-
- // Initialize the values to nothing...
- StackFrame.Values.resize(FuncInfo->NumPlaneElements.size());
- for (unsigned i = 0; i < FuncInfo->NumPlaneElements.size(); ++i) {
- StackFrame.Values[i].resize(FuncInfo->NumPlaneElements[i]);
-
- // Taint the initial values of stuff
- memset(&StackFrame.Values[i][0], 42,
- FuncInfo->NumPlaneElements[i]*sizeof(GenericValue));
- }
-
- StackFrame.PrevBB = 0; // No previous BB for PHI nodes...
-
// Run through the function arguments and initialize their values...
- assert((ArgVals.size() == F->asize() ||
- (ArgVals.size() > F->asize() && F->getFunctionType()->isVarArg())) &&
+ assert((ArgVals.size() == F->arg_size() ||
+ (ArgVals.size() > F->arg_size() && F->getFunctionType()->isVarArg()))&&
"Invalid number of values passed to function invocation!");
// Handle non-varargs arguments...
unsigned i = 0;
- for (Function::aiterator AI = F->abegin(), E = F->aend(); AI != E; ++AI, ++i)
+ for (Function::arg_iterator AI = F->arg_begin(), E = F->arg_end(); AI != E; ++AI, ++i)
SetValue(AI, ArgVals[i], StackFrame);
// Handle varargs arguments...
StackFrame.VarArgs.assign(ArgVals.begin()+i, ArgVals.end());
}
-// executeInstruction - Interpret a single instruction, increment the "PC", and
-// return true if the next instruction is a breakpoint...
-//
-bool Interpreter::executeInstruction() {
- assert(!ECStack.empty() && "No program running, cannot execute inst!");
-
- ExecutionContext &SF = ECStack.back(); // Current stack frame
- Instruction &I = *SF.CurInst++; // Increment before execute
-
- if (Trace)
- CW << "Run:" << I;
-
- // Track the number of dynamic instructions executed.
- ++NumDynamicInsts;
-
- // Set a sigsetjmp buffer so that we can recover if an error happens during
- // instruction execution...
- //
- if (int SigNo = sigsetjmp(SignalRecoverBuffer, 1)) {
- --SF.CurInst; // Back up to erroring instruction
- if (SigNo != SIGINT) {
- std::cout << "EXCEPTION OCCURRED [" << strsignal(SigNo) << "]:\n";
- printStackTrace();
- // If -abort-on-exception was specified, terminate LLI instead of trying
- // to debug it.
- //
- if (AbortOnExceptions) exit(1);
- } else if (SigNo == SIGINT) {
- std::cout << "CTRL-C Detected, execution halted.\n";
- }
- InInstruction = false;
- return true;
- }
-
- InInstruction = true;
- if (I.isBinaryOp()) {
- executeBinaryInst(cast<BinaryOperator>(I), SF);
- } else {
- switch (I.getOpcode()) {
- // Terminators
- case Instruction::Ret: executeRetInst (cast<ReturnInst>(I), SF); break;
- case Instruction::Br: executeBrInst (cast<BranchInst>(I), SF); break;
- case Instruction::Switch: executeSwitch (cast<SwitchInst>(I), SF); break;
- // Memory Instructions
- case Instruction::Alloca:
- case Instruction::Malloc: executeAllocInst((AllocationInst&)I, SF); break;
- case Instruction::Free: executeFreeInst (cast<FreeInst> (I), SF); break;
- case Instruction::Load: executeLoadInst (cast<LoadInst> (I), SF); break;
- case Instruction::Store: executeStoreInst(cast<StoreInst>(I), SF); break;
- case Instruction::GetElementPtr:
- executeGEPInst(cast<GetElementPtrInst>(I), SF); break;
-
- // Miscellaneous Instructions
- case Instruction::Call: executeCallInst (cast<CallInst> (I), SF); break;
- case Instruction::PHINode: executePHINode (cast<PHINode> (I), SF); break;
- case Instruction::Cast: executeCastInst (cast<CastInst> (I), SF); break;
- case Instruction::Shl: executeShlInst (cast<ShiftInst>(I), SF); break;
- case Instruction::Shr: executeShrInst (cast<ShiftInst>(I), SF); break;
- case Instruction::VarArg: executeVarArgInst(cast<VarArgInst>(I),SF); break;
- default:
- std::cout << "Don't know how to execute this instruction!\n-->" << I;
- abort();
- }
- }
- InInstruction = false;
-
- // Reset the current frame location to the top of stack
- CurFrame = ECStack.size()-1;
-
- if (CurFrame == -1) return false; // No breakpoint if no code
-
- // Return true if there is a breakpoint annotation on the instruction...
- return ECStack[CurFrame].CurInst->getAnnotation(BreakpointAID) != 0;
-}
-
-void Interpreter::stepInstruction() { // Do the 'step' command
- if (ECStack.empty()) {
- std::cout << "Error: no program running, cannot step!\n";
- return;
- }
-
- // Run an instruction...
- executeInstruction();
-
- // Print the next instruction to execute...
- printCurrentInstruction();
-}
-
-// --- UI Stuff...
-void Interpreter::nextInstruction() { // Do the 'next' command
- if (ECStack.empty()) {
- std::cout << "Error: no program running, cannot 'next'!\n";
- return;
- }
-
- // If this is a call instruction, step over the call instruction...
- // TODO: ICALL, CALL WITH, ...
- if (ECStack.back().CurInst->getOpcode() == Instruction::Call) {
- unsigned StackSize = ECStack.size();
- // Step into the function...
- if (executeInstruction()) {
- // Hit a breakpoint, print current instruction, then return to user...
- std::cout << "Breakpoint hit!\n";
- printCurrentInstruction();
- return;
- }
-
- // If we we able to step into the function, finish it now. We might not be
- // able the step into a function, if it's external for example.
- if (ECStack.size() != StackSize)
- finish(); // Finish executing the function...
- else
- printCurrentInstruction();
-
- } else {
- // Normal instruction, just step...
- stepInstruction();
- }
-}
-
void Interpreter::run() {
- if (ECStack.empty()) {
- std::cout << "Error: no program running, cannot run!\n";
- return;
- }
-
- bool HitBreakpoint = false;
- while (!ECStack.empty() && !HitBreakpoint) {
- // Run an instruction...
- HitBreakpoint = executeInstruction();
- }
-
- if (HitBreakpoint)
- std::cout << "Breakpoint hit!\n";
-
- // Print the next instruction to execute...
- printCurrentInstruction();
-}
-
-void Interpreter::finish() {
- if (ECStack.empty()) {
- std::cout << "Error: no program running, cannot run!\n";
- return;
- }
-
- unsigned StackSize = ECStack.size();
- bool HitBreakpoint = false;
- while (ECStack.size() >= StackSize && !HitBreakpoint) {
- // Run an instruction...
- HitBreakpoint = executeInstruction();
- }
-
- if (HitBreakpoint)
- std::cout << "Breakpoint hit!\n";
-
- // Print the next instruction to execute...
- printCurrentInstruction();
-}
-
-
-
-// printCurrentInstruction - Print out the instruction that the virtual PC is
-// at, or fail silently if no program is running.
-//
-void Interpreter::printCurrentInstruction() {
- if (!ECStack.empty()) {
- if (ECStack.back().CurBB->begin() == ECStack.back().CurInst) // print label
- WriteAsOperand(std::cout, ECStack.back().CurBB) << ":\n";
-
- Instruction &I = *ECStack.back().CurInst;
- InstNumber *IN = (InstNumber*)I.getAnnotation(SlotNumberAID);
- assert(IN && "Instruction has no numbering annotation!");
- std::cout << "#" << IN->InstNum << I;
- }
-}
-
-void Interpreter::printValue(const Type *Ty, GenericValue V) {
- switch (Ty->getPrimitiveID()) {
- case Type::BoolTyID: std::cout << (V.BoolVal?"true":"false"); break;
- case Type::SByteTyID:
- std::cout << (int)V.SByteVal << " '" << V.SByteVal << "'"; break;
- case Type::UByteTyID:
- std::cout << (unsigned)V.UByteVal << " '" << V.UByteVal << "'"; break;
- case Type::ShortTyID: std::cout << V.ShortVal; break;
- case Type::UShortTyID: std::cout << V.UShortVal; break;
- case Type::IntTyID: std::cout << V.IntVal; break;
- case Type::UIntTyID: std::cout << V.UIntVal; break;
- case Type::LongTyID: std::cout << (long)V.LongVal; break;
- case Type::ULongTyID: std::cout << (unsigned long)V.ULongVal; break;
- case Type::FloatTyID: std::cout << V.FloatVal; break;
- case Type::DoubleTyID: std::cout << V.DoubleVal; break;
- case Type::PointerTyID:std::cout << (void*)GVTOP(V); break;
- default:
- std::cout << "- Don't know how to print value of this type!";
- break;
- }
-}
-
-void Interpreter::print(const Type *Ty, GenericValue V) {
- CW << Ty << " ";
- printValue(Ty, V);
-}
-
-void Interpreter::print(const std::string &Name) {
- Value *PickedVal = ChooseOneOption(Name, LookupMatchingNames(Name));
- if (!PickedVal) return;
-
- if (const Function *F = dyn_cast<const Function>(PickedVal)) {
- CW << F; // Print the function
- } else if (const Type *Ty = dyn_cast<const Type>(PickedVal)) {
- CW << "type %" << Name << " = " << Ty->getDescription() << "\n";
- } else if (const BasicBlock *BB = dyn_cast<const BasicBlock>(PickedVal)) {
- CW << BB; // Print the basic block
- } else { // Otherwise there should be an annotation for the slot#
- print(PickedVal->getType(),
- getOperandValue(PickedVal, ECStack[CurFrame]));
- std::cout << "\n";
- }
-}
-
-void Interpreter::infoValue(const std::string &Name) {
- Value *PickedVal = ChooseOneOption(Name, LookupMatchingNames(Name));
- if (!PickedVal) return;
+ while (!ECStack.empty()) {
+ // Interpret a single instruction & increment the "PC".
+ ExecutionContext &SF = ECStack.back(); // Current stack frame
+ Instruction &I = *SF.CurInst++; // Increment before execute
- std::cout << "Value: ";
- print(PickedVal->getType(),
- getOperandValue(PickedVal, ECStack[CurFrame]));
- std::cout << "\n";
- printOperandInfo(PickedVal, ECStack[CurFrame]);
-}
-
-// printStackFrame - Print information about the specified stack frame, or -1
-// for the default one.
-//
-void Interpreter::printStackFrame(int FrameNo) {
- if (FrameNo == -1) FrameNo = CurFrame;
- Function *F = ECStack[FrameNo].CurFunction;
- const Type *RetTy = F->getReturnType();
-
- CW << ((FrameNo == CurFrame) ? '>' : '-') << "#" << FrameNo << ". "
- << (Value*)RetTy << " \"" << F->getName() << "\"(";
-
- unsigned i = 0;
- for (Function::aiterator I = F->abegin(), E = F->aend(); I != E; ++I, ++i) {
- if (i != 0) std::cout << ", ";
- CW << *I << "=";
-
- printValue(I->getType(), getOperandValue(I, ECStack[FrameNo]));
- }
-
- std::cout << ")\n";
+ // Track the number of dynamic instructions executed.
+ ++NumDynamicInsts;
- if (FrameNo != int(ECStack.size()-1)) {
- BasicBlock::iterator I = ECStack[FrameNo].CurInst;
- CW << --I;
- } else {
- CW << *ECStack[FrameNo].CurInst;
+ DEBUG(std::cerr << "About to interpret: " << I);
+ visit(I); // Dispatch to one of the visit* methods...
}
}
-
projects / oota-llvm.git / blobdiff