--- /dev/null
+//===- llvm/Analysis/MallocFreeHelper.h - Identify malloc/free --*- C++ -*-===//
+//
+// The LLVM Compiler Infrastructure
+//
+// This file is distributed under the University of Illinois Open Source
+// License. See LICENSE.TXT for details.
+//
+//===----------------------------------------------------------------------===//
+//
+// This family of functions identifies calls to malloc, bitcasts of malloc
+// calls, and the types and array sizes associated with them. It also
+// identifies calls to the free builtin.
+//
+//===----------------------------------------------------------------------===//
+
+#ifndef LLVM_ANALYSIS_MALLOCHELPER_H
+#define LLVM_ANALYSIS_MALLOCHELPER_H
+
+namespace llvm {
+class CallInst;
+class LLVMContext;
+class PointerType;
+class TargetData;
+class Type;
+class Value;
+
+//===----------------------------------------------------------------------===//
+// malloc Call Utility Functions.
+//
+
+/// isMalloc - Returns true if the value is either a malloc call or a bitcast of
+/// the result of a malloc call
+bool isMalloc(const Value* I);
+
+/// extractMallocCall - Returns the corresponding CallInst if the instruction
+/// is a malloc call. Since CallInst::CreateMalloc() only creates calls, we
+/// ignore InvokeInst here.
+const CallInst* extractMallocCall(const Value* I);
+CallInst* extractMallocCall(Value* I);
+
+/// extractMallocCallFromBitCast - Returns the corresponding CallInst if the
+/// instruction is a bitcast of the result of a malloc call.
+const CallInst* extractMallocCallFromBitCast(const Value* I);
+CallInst* extractMallocCallFromBitCast(Value* I);
+
+/// isArrayMalloc - Returns the corresponding CallInst if the instruction
+/// matches the malloc call IR generated by CallInst::CreateMalloc(). This
+/// means that it is a malloc call with one bitcast use AND the malloc call's
+/// size argument is:
+/// 1. a constant not equal to the size of the malloced type
+/// or
+/// 2. the result of a multiplication by the size of the malloced type
+/// Otherwise it returns NULL.
+/// The unique bitcast is needed to determine the type/size of the array
+/// allocation.
+CallInst* isArrayMalloc(Value* I, LLVMContext &Context, const TargetData* TD);
+const CallInst* isArrayMalloc(const Value* I, LLVMContext &Context,
+ const TargetData* TD);
+
+/// getMallocType - Returns the PointerType resulting from the malloc call.
+/// This PointerType is the result type of the call's only bitcast use.
+/// If there is no unique bitcast use, then return NULL.
+const PointerType* getMallocType(const CallInst* CI);
+
+/// getMallocAllocatedType - Returns the Type allocated by malloc call. This
+/// Type is the result type of the call's only bitcast use. If there is no
+/// unique bitcast use, then return NULL.
+const Type* getMallocAllocatedType(const CallInst* CI);
+
+/// getMallocArraySize - Returns the array size of a malloc call. For array
+/// mallocs, the size is computated in 1 of 3 ways:
+/// 1. If the element type is of size 1, then array size is the argument to
+/// malloc.
+/// 2. Else if the malloc's argument is a constant, the array size is that
+/// argument divided by the element type's size.
+/// 3. Else the malloc argument must be a multiplication and the array size is
+/// the first operand of the multiplication.
+/// For non-array mallocs, the computed size is constant 1.
+/// This function returns NULL for all mallocs whose array size cannot be
+/// determined.
+Value* getMallocArraySize(CallInst* CI, LLVMContext &Context,
+ const TargetData* TD);
+
+//===----------------------------------------------------------------------===//
+// free Call Utility Functions.
+//
+
+/// isFreeCall - Returns true if the the value is a call to the builtin free()
+bool isFreeCall(const Value* I);
+
+} // End llvm namespace
+
+#endif
+++ /dev/null
-//===- llvm/Analysis/MallocFreeHelper.h - Identify malloc/free --*- C++ -*-===//
-//
-// The LLVM Compiler Infrastructure
-//
-// This file is distributed under the University of Illinois Open Source
-// License. See LICENSE.TXT for details.
-//
-//===----------------------------------------------------------------------===//
-//
-// This family of functions identifies calls to malloc, bitcasts of malloc
-// calls, and the types and array sizes associated with them. It also
-// identifies calls to the free builtin.
-//
-//===----------------------------------------------------------------------===//
-
-#ifndef LLVM_ANALYSIS_MALLOCHELPER_H
-#define LLVM_ANALYSIS_MALLOCHELPER_H
-
-namespace llvm {
-class CallInst;
-class LLVMContext;
-class PointerType;
-class TargetData;
-class Type;
-class Value;
-
-//===----------------------------------------------------------------------===//
-// malloc Call Utility Functions.
-//
-
-/// isMalloc - Returns true if the value is either a malloc call or a bitcast of
-/// the result of a malloc call
-bool isMalloc(const Value* I);
-
-/// extractMallocCall - Returns the corresponding CallInst if the instruction
-/// is a malloc call. Since CallInst::CreateMalloc() only creates calls, we
-/// ignore InvokeInst here.
-const CallInst* extractMallocCall(const Value* I);
-CallInst* extractMallocCall(Value* I);
-
-/// extractMallocCallFromBitCast - Returns the corresponding CallInst if the
-/// instruction is a bitcast of the result of a malloc call.
-const CallInst* extractMallocCallFromBitCast(const Value* I);
-CallInst* extractMallocCallFromBitCast(Value* I);
-
-/// isArrayMalloc - Returns the corresponding CallInst if the instruction
-/// matches the malloc call IR generated by CallInst::CreateMalloc(). This
-/// means that it is a malloc call with one bitcast use AND the malloc call's
-/// size argument is:
-/// 1. a constant not equal to the size of the malloced type
-/// or
-/// 2. the result of a multiplication by the size of the malloced type
-/// Otherwise it returns NULL.
-/// The unique bitcast is needed to determine the type/size of the array
-/// allocation.
-CallInst* isArrayMalloc(Value* I, LLVMContext &Context, const TargetData* TD);
-const CallInst* isArrayMalloc(const Value* I, LLVMContext &Context,
- const TargetData* TD);
-
-/// getMallocType - Returns the PointerType resulting from the malloc call.
-/// This PointerType is the result type of the call's only bitcast use.
-/// If there is no unique bitcast use, then return NULL.
-const PointerType* getMallocType(const CallInst* CI);
-
-/// getMallocAllocatedType - Returns the Type allocated by malloc call. This
-/// Type is the result type of the call's only bitcast use. If there is no
-/// unique bitcast use, then return NULL.
-const Type* getMallocAllocatedType(const CallInst* CI);
-
-/// getMallocArraySize - Returns the array size of a malloc call. For array
-/// mallocs, the size is computated in 1 of 3 ways:
-/// 1. If the element type is of size 1, then array size is the argument to
-/// malloc.
-/// 2. Else if the malloc's argument is a constant, the array size is that
-/// argument divided by the element type's size.
-/// 3. Else the malloc argument must be a multiplication and the array size is
-/// the first operand of the multiplication.
-/// For non-array mallocs, the computed size is constant 1.
-/// This function returns NULL for all mallocs whose array size cannot be
-/// determined.
-Value* getMallocArraySize(CallInst* CI, LLVMContext &Context,
- const TargetData* TD);
-
-//===----------------------------------------------------------------------===//
-// free Call Utility Functions.
-//
-
-/// isFreeCall - Returns true if the the value is a call to the builtin free()
-bool isFreeCall(const Value* I);
-
-} // End llvm namespace
-
-#endif
#include "llvm/Analysis/AliasSetTracker.h"
#include "llvm/Analysis/AliasAnalysis.h"
-#include "llvm/Analysis/MallocHelper.h"
+#include "llvm/Analysis/MallocFreeHelper.h"
#include "llvm/Instructions.h"
#include "llvm/IntrinsicInst.h"
#include "llvm/Pass.h"
#include "llvm/Analysis/AliasAnalysis.h"
#include "llvm/Analysis/CaptureTracking.h"
-#include "llvm/Analysis/MallocHelper.h"
+#include "llvm/Analysis/MallocFreeHelper.h"
#include "llvm/Analysis/Passes.h"
#include "llvm/Constants.h"
#include "llvm/DerivedTypes.h"
LoopDependenceAnalysis.cpp
LoopInfo.cpp
LoopPass.cpp
- MallocHelper.cpp
+ MallocFreeHelper.cpp
MemoryDependenceAnalysis.cpp
PointerTracking.cpp
PostDominators.cpp
//===----------------------------------------------------------------------===//
#include "llvm/Analysis/CaptureTracking.h"
-#include "llvm/Analysis/MallocHelper.h"
+#include "llvm/Analysis/MallocFreeHelper.h"
#include "llvm/Instructions.h"
#include "llvm/Value.h"
#include "llvm/ADT/SmallSet.h"
#include "llvm/Support/InstIterator.h"
#include "llvm/Support/InstVisitor.h"
#include "llvm/Analysis/AliasAnalysis.h"
-#include "llvm/Analysis/MallocHelper.h"
+#include "llvm/Analysis/MallocFreeHelper.h"
#include "llvm/Analysis/Passes.h"
#include "llvm/Support/Debug.h"
#include "llvm/System/Atomic.h"
#include "llvm/DerivedTypes.h"
#include "llvm/Analysis/AliasAnalysis.h"
#include "llvm/Analysis/CallGraph.h"
-#include "llvm/Analysis/MallocHelper.h"
+#include "llvm/Analysis/MallocFreeHelper.h"
#include "llvm/Support/CommandLine.h"
#include "llvm/Support/InstIterator.h"
#include "llvm/ADT/Statistic.h"
--- /dev/null
+//===-- MallocFreeHelper.cpp - Identify calls to malloc and free builtins -===//
+//
+// The LLVM Compiler Infrastructure
+//
+// This file is distributed under the University of Illinois Open Source
+// License. See LICENSE.TXT for details.
+//
+//===----------------------------------------------------------------------===//
+//
+// This family of functions identifies calls to malloc, bitcasts of malloc
+// calls, and the types and array sizes associated with them. It also
+// identifies calls to the free builtin.
+//
+//===----------------------------------------------------------------------===//
+
+#include "llvm/Analysis/MallocFreeHelper.h"
+#include "llvm/Constants.h"
+#include "llvm/Instructions.h"
+#include "llvm/Module.h"
+#include "llvm/Analysis/ConstantFolding.h"
+using namespace llvm;
+
+//===----------------------------------------------------------------------===//
+// malloc Call Utility Functions.
+//
+
+/// isMalloc - Returns true if the the value is either a malloc call or a
+/// bitcast of the result of a malloc call.
+bool llvm::isMalloc(const Value* I) {
+ return extractMallocCall(I) || extractMallocCallFromBitCast(I);
+}
+
+static bool isMallocCall(const CallInst *CI) {
+ if (!CI)
+ return false;
+
+ const Module* M = CI->getParent()->getParent()->getParent();
+ Function *MallocFunc = M->getFunction("malloc");
+
+ if (CI->getOperand(0) != MallocFunc)
+ return false;
+
+ // Check malloc prototype.
+ // FIXME: workaround for PR5130, this will be obsolete when a nobuiltin
+ // attribute will exist.
+ const FunctionType *FTy = MallocFunc->getFunctionType();
+ if (FTy->getNumParams() != 1)
+ return false;
+ if (IntegerType *ITy = dyn_cast<IntegerType>(FTy->param_begin()->get())) {
+ if (ITy->getBitWidth() != 32 && ITy->getBitWidth() != 64)
+ return false;
+ return true;
+ }
+
+ return false;
+}
+
+/// extractMallocCall - Returns the corresponding CallInst if the instruction
+/// is a malloc call. Since CallInst::CreateMalloc() only creates calls, we
+/// ignore InvokeInst here.
+const CallInst* llvm::extractMallocCall(const Value* I) {
+ const CallInst *CI = dyn_cast<CallInst>(I);
+ return (isMallocCall(CI)) ? CI : NULL;
+}
+
+CallInst* llvm::extractMallocCall(Value* I) {
+ CallInst *CI = dyn_cast<CallInst>(I);
+ return (isMallocCall(CI)) ? CI : NULL;
+}
+
+static bool isBitCastOfMallocCall(const BitCastInst* BCI) {
+ if (!BCI)
+ return false;
+
+ return isMallocCall(dyn_cast<CallInst>(BCI->getOperand(0)));
+}
+
+/// extractMallocCallFromBitCast - Returns the corresponding CallInst if the
+/// instruction is a bitcast of the result of a malloc call.
+CallInst* llvm::extractMallocCallFromBitCast(Value* I) {
+ BitCastInst *BCI = dyn_cast<BitCastInst>(I);
+ return (isBitCastOfMallocCall(BCI)) ? cast<CallInst>(BCI->getOperand(0))
+ : NULL;
+}
+
+const CallInst* llvm::extractMallocCallFromBitCast(const Value* I) {
+ const BitCastInst *BCI = dyn_cast<BitCastInst>(I);
+ return (isBitCastOfMallocCall(BCI)) ? cast<CallInst>(BCI->getOperand(0))
+ : NULL;
+}
+
+static bool isArrayMallocHelper(const CallInst *CI, LLVMContext &Context,
+ const TargetData* TD) {
+ if (!CI)
+ return false;
+
+ const Type* T = getMallocAllocatedType(CI);
+
+ // We can only indentify an array malloc if we know the type of the malloc
+ // call.
+ if (!T) return false;
+
+ Value* MallocArg = CI->getOperand(1);
+ Constant *ElementSize = ConstantExpr::getSizeOf(T);
+ ElementSize = ConstantExpr::getTruncOrBitCast(ElementSize,
+ MallocArg->getType());
+ Constant *FoldedElementSize = ConstantFoldConstantExpression(
+ cast<ConstantExpr>(ElementSize),
+ Context, TD);
+
+
+ if (isa<ConstantExpr>(MallocArg))
+ return (MallocArg != ElementSize);
+
+ BinaryOperator *BI = dyn_cast<BinaryOperator>(MallocArg);
+ if (!BI)
+ return false;
+
+ if (BI->getOpcode() == Instruction::Mul)
+ // ArraySize * ElementSize
+ if (BI->getOperand(1) == ElementSize ||
+ (FoldedElementSize && BI->getOperand(1) == FoldedElementSize))
+ return true;
+
+ // TODO: Detect case where MallocArg mul has been transformed to shl.
+
+ return false;
+}
+
+/// isArrayMalloc - Returns the corresponding CallInst if the instruction
+/// matches the malloc call IR generated by CallInst::CreateMalloc(). This
+/// means that it is a malloc call with one bitcast use AND the malloc call's
+/// size argument is:
+/// 1. a constant not equal to the size of the malloced type
+/// or
+/// 2. the result of a multiplication by the size of the malloced type
+/// Otherwise it returns NULL.
+/// The unique bitcast is needed to determine the type/size of the array
+/// allocation.
+CallInst* llvm::isArrayMalloc(Value* I, LLVMContext &Context,
+ const TargetData* TD) {
+ CallInst *CI = extractMallocCall(I);
+ return (isArrayMallocHelper(CI, Context, TD)) ? CI : NULL;
+}
+
+const CallInst* llvm::isArrayMalloc(const Value* I, LLVMContext &Context,
+ const TargetData* TD) {
+ const CallInst *CI = extractMallocCall(I);
+ return (isArrayMallocHelper(CI, Context, TD)) ? CI : NULL;
+}
+
+/// getMallocType - Returns the PointerType resulting from the malloc call.
+/// This PointerType is the result type of the call's only bitcast use.
+/// If there is no unique bitcast use, then return NULL.
+const PointerType* llvm::getMallocType(const CallInst* CI) {
+ assert(isMalloc(CI) && "GetMallocType and not malloc call");
+
+ const BitCastInst* BCI = NULL;
+
+ // Determine if CallInst has a bitcast use.
+ for (Value::use_const_iterator UI = CI->use_begin(), E = CI->use_end();
+ UI != E; )
+ if ((BCI = dyn_cast<BitCastInst>(cast<Instruction>(*UI++))))
+ break;
+
+ // Malloc call has 1 bitcast use and no other uses, so type is the bitcast's
+ // destination type.
+ if (BCI && CI->hasOneUse())
+ return cast<PointerType>(BCI->getDestTy());
+
+ // Malloc call was not bitcast, so type is the malloc function's return type.
+ if (!BCI)
+ return cast<PointerType>(CI->getType());
+
+ // Type could not be determined.
+ return NULL;
+}
+
+/// getMallocAllocatedType - Returns the Type allocated by malloc call. This
+/// Type is the result type of the call's only bitcast use. If there is no
+/// unique bitcast use, then return NULL.
+const Type* llvm::getMallocAllocatedType(const CallInst* CI) {
+ const PointerType* PT = getMallocType(CI);
+ return PT ? PT->getElementType() : NULL;
+}
+
+/// isSafeToGetMallocArraySize - Returns true if the array size of a malloc can
+/// be determined. It can be determined in these 3 cases of malloc codegen:
+/// 1. non-array malloc: The malloc's size argument is a constant and equals the /// size of the type being malloced.
+/// 2. array malloc: This is a malloc call with one bitcast use AND the malloc
+/// call's size argument is a constant multiple of the size of the malloced
+/// type.
+/// 3. array malloc: This is a malloc call with one bitcast use AND the malloc
+/// call's size argument is the result of a multiplication by the size of the
+/// malloced type.
+/// Otherwise returns false.
+static bool isSafeToGetMallocArraySize(const CallInst *CI,
+ LLVMContext &Context,
+ const TargetData* TD) {
+ if (!CI)
+ return false;
+
+ // Type must be known to determine array size.
+ const Type* T = getMallocAllocatedType(CI);
+ if (!T) return false;
+
+ Value* MallocArg = CI->getOperand(1);
+ Constant *ElementSize = ConstantExpr::getSizeOf(T);
+ ElementSize = ConstantExpr::getTruncOrBitCast(ElementSize,
+ MallocArg->getType());
+
+ // First, check if it is a non-array malloc.
+ if (isa<ConstantExpr>(MallocArg) && (MallocArg == ElementSize))
+ return true;
+
+ // Second, check if it can be determined that this is an array malloc.
+ return isArrayMallocHelper(CI, Context, TD);
+}
+
+/// isConstantOne - Return true only if val is constant int 1.
+static bool isConstantOne(Value *val) {
+ return isa<ConstantInt>(val) && cast<ConstantInt>(val)->isOne();
+}
+
+/// getMallocArraySize - Returns the array size of a malloc call. For array
+/// mallocs, the size is computated in 1 of 3 ways:
+/// 1. If the element type is of size 1, then array size is the argument to
+/// malloc.
+/// 2. Else if the malloc's argument is a constant, the array size is that
+/// argument divided by the element type's size.
+/// 3. Else the malloc argument must be a multiplication and the array size is
+/// the first operand of the multiplication.
+/// For non-array mallocs, the computed size is constant 1.
+/// This function returns NULL for all mallocs whose array size cannot be
+/// determined.
+Value* llvm::getMallocArraySize(CallInst* CI, LLVMContext &Context,
+ const TargetData* TD) {
+ if (!isSafeToGetMallocArraySize(CI, Context, TD))
+ return NULL;
+
+ // Match CreateMalloc's use of constant 1 array-size for non-array mallocs.
+ if (!isArrayMalloc(CI, Context, TD))
+ return ConstantInt::get(CI->getOperand(1)->getType(), 1);
+
+ Value* MallocArg = CI->getOperand(1);
+ assert(getMallocAllocatedType(CI) && "getMallocArraySize and no type");
+ Constant *ElementSize = ConstantExpr::getSizeOf(getMallocAllocatedType(CI));
+ ElementSize = ConstantExpr::getTruncOrBitCast(ElementSize,
+ MallocArg->getType());
+
+ Constant* CO = dyn_cast<Constant>(MallocArg);
+ BinaryOperator* BO = dyn_cast<BinaryOperator>(MallocArg);
+ assert((isConstantOne(ElementSize) || CO || BO) &&
+ "getMallocArraySize and malformed malloc IR");
+
+ if (isConstantOne(ElementSize))
+ return MallocArg;
+
+ if (CO)
+ return CO->getOperand(0);
+
+ // TODO: Detect case where MallocArg mul has been transformed to shl.
+
+ assert(BO && "getMallocArraySize not constant but not multiplication either");
+ return BO->getOperand(0);
+}
+
+//===----------------------------------------------------------------------===//
+// free Call Utility Functions.
+//
+
+/// isFreeCall - Returns true if the the value is a call to the builtin free()
+bool llvm::isFreeCall(const Value* I) {
+ const CallInst *CI = dyn_cast<CallInst>(I);
+ if (!CI)
+ return false;
+
+ const Module* M = CI->getParent()->getParent()->getParent();
+ Function *FreeFunc = M->getFunction("free");
+
+ if (CI->getOperand(0) != FreeFunc)
+ return false;
+
+ // Check free prototype.
+ // FIXME: workaround for PR5130, this will be obsolete when a nobuiltin
+ // attribute will exist.
+ const FunctionType *FTy = FreeFunc->getFunctionType();
+ if (FTy->getReturnType() != Type::getVoidTy(M->getContext()))
+ return false;
+ if (FTy->getNumParams() != 1)
+ return false;
+ if (FTy->param_begin()->get() != Type::getInt8PtrTy(M->getContext()))
+ return false;
+
+ return true;
+}
+++ /dev/null
-//===-- MallocFreeHelper.cpp - Identify calls to malloc and free builtins -===//
-//
-// The LLVM Compiler Infrastructure
-//
-// This file is distributed under the University of Illinois Open Source
-// License. See LICENSE.TXT for details.
-//
-//===----------------------------------------------------------------------===//
-//
-// This family of functions identifies calls to malloc, bitcasts of malloc
-// calls, and the types and array sizes associated with them. It also
-// identifies calls to the free builtin.
-//
-//===----------------------------------------------------------------------===//
-
-#include "llvm/Analysis/MallocHelper.h"
-#include "llvm/Constants.h"
-#include "llvm/Instructions.h"
-#include "llvm/Module.h"
-#include "llvm/Analysis/ConstantFolding.h"
-using namespace llvm;
-
-//===----------------------------------------------------------------------===//
-// malloc Call Utility Functions.
-//
-
-/// isMalloc - Returns true if the the value is either a malloc call or a
-/// bitcast of the result of a malloc call.
-bool llvm::isMalloc(const Value* I) {
- return extractMallocCall(I) || extractMallocCallFromBitCast(I);
-}
-
-static bool isMallocCall(const CallInst *CI) {
- if (!CI)
- return false;
-
- const Module* M = CI->getParent()->getParent()->getParent();
- Function *MallocFunc = M->getFunction("malloc");
-
- if (CI->getOperand(0) != MallocFunc)
- return false;
-
- // Check malloc prototype.
- // FIXME: workaround for PR5130, this will be obsolete when a nobuiltin
- // attribute will exist.
- const FunctionType *FTy = MallocFunc->getFunctionType();
- if (FTy->getNumParams() != 1)
- return false;
- if (IntegerType *ITy = dyn_cast<IntegerType>(FTy->param_begin()->get())) {
- if (ITy->getBitWidth() != 32 && ITy->getBitWidth() != 64)
- return false;
- return true;
- }
-
- return false;
-}
-
-/// extractMallocCall - Returns the corresponding CallInst if the instruction
-/// is a malloc call. Since CallInst::CreateMalloc() only creates calls, we
-/// ignore InvokeInst here.
-const CallInst* llvm::extractMallocCall(const Value* I) {
- const CallInst *CI = dyn_cast<CallInst>(I);
- return (isMallocCall(CI)) ? CI : NULL;
-}
-
-CallInst* llvm::extractMallocCall(Value* I) {
- CallInst *CI = dyn_cast<CallInst>(I);
- return (isMallocCall(CI)) ? CI : NULL;
-}
-
-static bool isBitCastOfMallocCall(const BitCastInst* BCI) {
- if (!BCI)
- return false;
-
- return isMallocCall(dyn_cast<CallInst>(BCI->getOperand(0)));
-}
-
-/// extractMallocCallFromBitCast - Returns the corresponding CallInst if the
-/// instruction is a bitcast of the result of a malloc call.
-CallInst* llvm::extractMallocCallFromBitCast(Value* I) {
- BitCastInst *BCI = dyn_cast<BitCastInst>(I);
- return (isBitCastOfMallocCall(BCI)) ? cast<CallInst>(BCI->getOperand(0))
- : NULL;
-}
-
-const CallInst* llvm::extractMallocCallFromBitCast(const Value* I) {
- const BitCastInst *BCI = dyn_cast<BitCastInst>(I);
- return (isBitCastOfMallocCall(BCI)) ? cast<CallInst>(BCI->getOperand(0))
- : NULL;
-}
-
-static bool isArrayMallocHelper(const CallInst *CI, LLVMContext &Context,
- const TargetData* TD) {
- if (!CI)
- return false;
-
- const Type* T = getMallocAllocatedType(CI);
-
- // We can only indentify an array malloc if we know the type of the malloc
- // call.
- if (!T) return false;
-
- Value* MallocArg = CI->getOperand(1);
- Constant *ElementSize = ConstantExpr::getSizeOf(T);
- ElementSize = ConstantExpr::getTruncOrBitCast(ElementSize,
- MallocArg->getType());
- Constant *FoldedElementSize = ConstantFoldConstantExpression(
- cast<ConstantExpr>(ElementSize),
- Context, TD);
-
-
- if (isa<ConstantExpr>(MallocArg))
- return (MallocArg != ElementSize);
-
- BinaryOperator *BI = dyn_cast<BinaryOperator>(MallocArg);
- if (!BI)
- return false;
-
- if (BI->getOpcode() == Instruction::Mul)
- // ArraySize * ElementSize
- if (BI->getOperand(1) == ElementSize ||
- (FoldedElementSize && BI->getOperand(1) == FoldedElementSize))
- return true;
-
- // TODO: Detect case where MallocArg mul has been transformed to shl.
-
- return false;
-}
-
-/// isArrayMalloc - Returns the corresponding CallInst if the instruction
-/// matches the malloc call IR generated by CallInst::CreateMalloc(). This
-/// means that it is a malloc call with one bitcast use AND the malloc call's
-/// size argument is:
-/// 1. a constant not equal to the size of the malloced type
-/// or
-/// 2. the result of a multiplication by the size of the malloced type
-/// Otherwise it returns NULL.
-/// The unique bitcast is needed to determine the type/size of the array
-/// allocation.
-CallInst* llvm::isArrayMalloc(Value* I, LLVMContext &Context,
- const TargetData* TD) {
- CallInst *CI = extractMallocCall(I);
- return (isArrayMallocHelper(CI, Context, TD)) ? CI : NULL;
-}
-
-const CallInst* llvm::isArrayMalloc(const Value* I, LLVMContext &Context,
- const TargetData* TD) {
- const CallInst *CI = extractMallocCall(I);
- return (isArrayMallocHelper(CI, Context, TD)) ? CI : NULL;
-}
-
-/// getMallocType - Returns the PointerType resulting from the malloc call.
-/// This PointerType is the result type of the call's only bitcast use.
-/// If there is no unique bitcast use, then return NULL.
-const PointerType* llvm::getMallocType(const CallInst* CI) {
- assert(isMalloc(CI) && "GetMallocType and not malloc call");
-
- const BitCastInst* BCI = NULL;
-
- // Determine if CallInst has a bitcast use.
- for (Value::use_const_iterator UI = CI->use_begin(), E = CI->use_end();
- UI != E; )
- if ((BCI = dyn_cast<BitCastInst>(cast<Instruction>(*UI++))))
- break;
-
- // Malloc call has 1 bitcast use and no other uses, so type is the bitcast's
- // destination type.
- if (BCI && CI->hasOneUse())
- return cast<PointerType>(BCI->getDestTy());
-
- // Malloc call was not bitcast, so type is the malloc function's return type.
- if (!BCI)
- return cast<PointerType>(CI->getType());
-
- // Type could not be determined.
- return NULL;
-}
-
-/// getMallocAllocatedType - Returns the Type allocated by malloc call. This
-/// Type is the result type of the call's only bitcast use. If there is no
-/// unique bitcast use, then return NULL.
-const Type* llvm::getMallocAllocatedType(const CallInst* CI) {
- const PointerType* PT = getMallocType(CI);
- return PT ? PT->getElementType() : NULL;
-}
-
-/// isSafeToGetMallocArraySize - Returns true if the array size of a malloc can
-/// be determined. It can be determined in these 3 cases of malloc codegen:
-/// 1. non-array malloc: The malloc's size argument is a constant and equals the /// size of the type being malloced.
-/// 2. array malloc: This is a malloc call with one bitcast use AND the malloc
-/// call's size argument is a constant multiple of the size of the malloced
-/// type.
-/// 3. array malloc: This is a malloc call with one bitcast use AND the malloc
-/// call's size argument is the result of a multiplication by the size of the
-/// malloced type.
-/// Otherwise returns false.
-static bool isSafeToGetMallocArraySize(const CallInst *CI,
- LLVMContext &Context,
- const TargetData* TD) {
- if (!CI)
- return false;
-
- // Type must be known to determine array size.
- const Type* T = getMallocAllocatedType(CI);
- if (!T) return false;
-
- Value* MallocArg = CI->getOperand(1);
- Constant *ElementSize = ConstantExpr::getSizeOf(T);
- ElementSize = ConstantExpr::getTruncOrBitCast(ElementSize,
- MallocArg->getType());
-
- // First, check if it is a non-array malloc.
- if (isa<ConstantExpr>(MallocArg) && (MallocArg == ElementSize))
- return true;
-
- // Second, check if it can be determined that this is an array malloc.
- return isArrayMallocHelper(CI, Context, TD);
-}
-
-/// isConstantOne - Return true only if val is constant int 1.
-static bool isConstantOne(Value *val) {
- return isa<ConstantInt>(val) && cast<ConstantInt>(val)->isOne();
-}
-
-/// getMallocArraySize - Returns the array size of a malloc call. For array
-/// mallocs, the size is computated in 1 of 3 ways:
-/// 1. If the element type is of size 1, then array size is the argument to
-/// malloc.
-/// 2. Else if the malloc's argument is a constant, the array size is that
-/// argument divided by the element type's size.
-/// 3. Else the malloc argument must be a multiplication and the array size is
-/// the first operand of the multiplication.
-/// For non-array mallocs, the computed size is constant 1.
-/// This function returns NULL for all mallocs whose array size cannot be
-/// determined.
-Value* llvm::getMallocArraySize(CallInst* CI, LLVMContext &Context,
- const TargetData* TD) {
- if (!isSafeToGetMallocArraySize(CI, Context, TD))
- return NULL;
-
- // Match CreateMalloc's use of constant 1 array-size for non-array mallocs.
- if (!isArrayMalloc(CI, Context, TD))
- return ConstantInt::get(CI->getOperand(1)->getType(), 1);
-
- Value* MallocArg = CI->getOperand(1);
- assert(getMallocAllocatedType(CI) && "getMallocArraySize and no type");
- Constant *ElementSize = ConstantExpr::getSizeOf(getMallocAllocatedType(CI));
- ElementSize = ConstantExpr::getTruncOrBitCast(ElementSize,
- MallocArg->getType());
-
- Constant* CO = dyn_cast<Constant>(MallocArg);
- BinaryOperator* BO = dyn_cast<BinaryOperator>(MallocArg);
- assert((isConstantOne(ElementSize) || CO || BO) &&
- "getMallocArraySize and malformed malloc IR");
-
- if (isConstantOne(ElementSize))
- return MallocArg;
-
- if (CO)
- return CO->getOperand(0);
-
- // TODO: Detect case where MallocArg mul has been transformed to shl.
-
- assert(BO && "getMallocArraySize not constant but not multiplication either");
- return BO->getOperand(0);
-}
-
-//===----------------------------------------------------------------------===//
-// free Call Utility Functions.
-//
-
-/// isFreeCall - Returns true if the the value is a call to the builtin free()
-bool llvm::isFreeCall(const Value* I) {
- const CallInst *CI = dyn_cast<CallInst>(I);
- if (!CI)
- return false;
-
- const Module* M = CI->getParent()->getParent()->getParent();
- Function *FreeFunc = M->getFunction("free");
-
- if (CI->getOperand(0) != FreeFunc)
- return false;
-
- // Check free prototype.
- // FIXME: workaround for PR5130, this will be obsolete when a nobuiltin
- // attribute will exist.
- const FunctionType *FTy = FreeFunc->getFunctionType();
- if (FTy->getReturnType() != Type::getVoidTy(M->getContext()))
- return false;
- if (FTy->getNumParams() != 1)
- return false;
- if (FTy->param_begin()->get() != Type::getInt8PtrTy(M->getContext()))
- return false;
-
- return true;
-}
#include "llvm/IntrinsicInst.h"
#include "llvm/Function.h"
#include "llvm/Analysis/AliasAnalysis.h"
-#include "llvm/Analysis/MallocHelper.h"
+#include "llvm/Analysis/MallocFreeHelper.h"
#include "llvm/ADT/Statistic.h"
#include "llvm/ADT/STLExtras.h"
#include "llvm/Support/PredIteratorCache.h"
#include "llvm/Analysis/ConstantFolding.h"
#include "llvm/Analysis/Dominators.h"
#include "llvm/Analysis/LoopInfo.h"
-#include "llvm/Analysis/MallocHelper.h"
+#include "llvm/Analysis/MallocFreeHelper.h"
#include "llvm/Analysis/PointerTracking.h"
#include "llvm/Analysis/ScalarEvolution.h"
#include "llvm/Analysis/ScalarEvolutionExpressions.h"
#include "llvm/Analysis/AliasAnalysis.h"
#include "llvm/Analysis/CallGraph.h"
#include "llvm/Analysis/CaptureTracking.h"
-#include "llvm/Analysis/MallocHelper.h"
+#include "llvm/Analysis/MallocFreeHelper.h"
#include "llvm/ADT/SmallSet.h"
#include "llvm/ADT/Statistic.h"
#include "llvm/ADT/UniqueVector.h"
#include "llvm/Module.h"
#include "llvm/Pass.h"
#include "llvm/Analysis/ConstantFolding.h"
-#include "llvm/Analysis/MallocHelper.h"
+#include "llvm/Analysis/MallocFreeHelper.h"
#include "llvm/Target/TargetData.h"
#include "llvm/Support/CallSite.h"
#include "llvm/Support/Debug.h"
#include "llvm/ADT/Statistic.h"
#include "llvm/Analysis/AliasAnalysis.h"
#include "llvm/Analysis/Dominators.h"
-#include "llvm/Analysis/MallocHelper.h"
+#include "llvm/Analysis/MallocFreeHelper.h"
#include "llvm/Analysis/MemoryDependenceAnalysis.h"
#include "llvm/Target/TargetData.h"
#include "llvm/Transforms/Utils/Local.h"
#include "llvm/ADT/Statistic.h"
#include "llvm/Analysis/Dominators.h"
#include "llvm/Analysis/AliasAnalysis.h"
-#include "llvm/Analysis/MallocHelper.h"
+#include "llvm/Analysis/MallocFreeHelper.h"
#include "llvm/Analysis/MemoryDependenceAnalysis.h"
#include "llvm/Support/CFG.h"
#include "llvm/Support/CommandLine.h"
#include "llvm/GlobalVariable.h"
#include "llvm/Operator.h"
#include "llvm/Analysis/ConstantFolding.h"
-#include "llvm/Analysis/MallocHelper.h"
+#include "llvm/Analysis/MallocFreeHelper.h"
#include "llvm/Analysis/ValueTracking.h"
#include "llvm/Target/TargetData.h"
#include "llvm/Transforms/Utils/BasicBlockUtils.h"
#include "llvm/LLVMContext.h"
#include "llvm/Pass.h"
#include "llvm/Analysis/ConstantFolding.h"
-#include "llvm/Analysis/MallocHelper.h"
+#include "llvm/Analysis/MallocFreeHelper.h"
#include "llvm/Analysis/ValueTracking.h"
#include "llvm/Transforms/Utils/Local.h"
#include "llvm/Support/CallSite.h"
#include "llvm/ADT/SmallPtrSet.h"
#include "llvm/Analysis/ConstantFolding.h"
#include "llvm/Analysis/DebugInfo.h"
-#include "llvm/Analysis/MallocHelper.h"
+#include "llvm/Analysis/MallocFreeHelper.h"
#include "llvm/Analysis/ProfileInfo.h"
#include "llvm/Target/TargetData.h"
#include "llvm/Support/GetElementPtrTypeIterator.h"
return false;
}
-// Code here matches isFreeCall from MallocHelper, which is not in VMCore.
+// Code here matches isFreeCall from MallocFreeHelper, which is not in VMCore.
static bool isFreeCall(const Value* I) {
const CallInst *CI = dyn_cast<CallInst>(I);
if (!CI)
}
}
-// Code here matches isMalloc from MallocHelper, which is not in VMCore.
+// Code here matches isMalloc from MallocFreeHelper, which is not in VMCore.
static bool isMalloc(const Value* I) {
const CallInst *CI = dyn_cast<CallInst>(I);
if (!CI) {
projects / oota-llvm.git / commitdiff