-//===- FunctionAttrs.cpp - Pass which marks functions readnone or readonly ===//
+//===- FunctionAttrs.cpp - Pass which marks functions attributes ----------===//
//
// The LLVM Compiler Infrastructure
//
//
// This file implements a simple interprocedural pass which walks the
// call-graph, looking for functions which do not access or only read
-// non-local memory, and marking them readnone/readonly. In addition,
-// it marks function arguments (of pointer type) 'nocapture' if a call
-// to the function does not create any copies of the pointer value that
-// outlive the call. This more or less means that the pointer is only
-// dereferenced, and not returned from the function or stored in a global.
-// This pass is implemented as a bottom-up traversal of the call-graph.
+// non-local memory, and marking them readnone/readonly. It does the
+// same with function arguments independently, marking them readonly/
+// readnone/nocapture. Finally, well-known library call declarations
+// are marked with all attributes that are consistent with the
+// function's standard definition. This pass is implemented as a
+// bottom-up traversal of the call-graph.
//
//===----------------------------------------------------------------------===//
#define DEBUG_TYPE "functionattrs"
#include "llvm/Transforms/IPO.h"
-#include "llvm/CallGraphSCCPass.h"
-#include "llvm/GlobalVariable.h"
-#include "llvm/IntrinsicInst.h"
-#include "llvm/LLVMContext.h"
-#include "llvm/Analysis/AliasAnalysis.h"
-#include "llvm/Analysis/CallGraph.h"
-#include "llvm/Analysis/CaptureTracking.h"
#include "llvm/ADT/SCCIterator.h"
+#include "llvm/ADT/SetVector.h"
#include "llvm/ADT/SmallSet.h"
#include "llvm/ADT/Statistic.h"
-#include "llvm/ADT/UniqueVector.h"
+#include "llvm/Analysis/AliasAnalysis.h"
+#include "llvm/Analysis/CallGraph.h"
+#include "llvm/Analysis/CallGraphSCCPass.h"
+#include "llvm/Analysis/CaptureTracking.h"
+#include "llvm/IR/GlobalVariable.h"
+#include "llvm/IR/IntrinsicInst.h"
+#include "llvm/IR/LLVMContext.h"
#include "llvm/Support/InstIterator.h"
+#include "llvm/Target/TargetLibraryInfo.h"
using namespace llvm;
STATISTIC(NumReadNone, "Number of functions marked readnone");
STATISTIC(NumReadOnly, "Number of functions marked readonly");
STATISTIC(NumNoCapture, "Number of arguments marked nocapture");
+STATISTIC(NumReadNoneArg, "Number of arguments marked readnone");
+STATISTIC(NumReadOnlyArg, "Number of arguments marked readonly");
STATISTIC(NumNoAlias, "Number of function returns marked noalias");
+STATISTIC(NumAnnotated, "Number of attributes added to library functions");
namespace {
struct FunctionAttrs : public CallGraphSCCPass {
// AddReadAttrs - Deduce readonly/readnone attributes for the SCC.
bool AddReadAttrs(const CallGraphSCC &SCC);
- // AddNoCaptureAttrs - Deduce nocapture attributes for the SCC.
- bool AddNoCaptureAttrs(const CallGraphSCC &SCC);
+ // AddArgumentAttrs - Deduce nocapture attributes for the SCC.
+ bool AddArgumentAttrs(const CallGraphSCC &SCC);
// IsFunctionMallocLike - Does this function allocate new memory?
bool IsFunctionMallocLike(Function *F,
// AddNoAliasAttrs - Deduce noalias attributes for the SCC.
bool AddNoAliasAttrs(const CallGraphSCC &SCC);
+ // Utility methods used by inferPrototypeAttributes to add attributes
+ // and maintain annotation statistics.
+
+ void setDoesNotAccessMemory(Function &F) {
+ if (!F.doesNotAccessMemory()) {
+ F.setDoesNotAccessMemory();
+ ++NumAnnotated;
+ }
+ }
+
+ void setOnlyReadsMemory(Function &F) {
+ if (!F.onlyReadsMemory()) {
+ F.setOnlyReadsMemory();
+ ++NumAnnotated;
+ }
+ }
+
+ void setDoesNotThrow(Function &F) {
+ if (!F.doesNotThrow()) {
+ F.setDoesNotThrow();
+ ++NumAnnotated;
+ }
+ }
+
+ void setDoesNotCapture(Function &F, unsigned n) {
+ if (!F.doesNotCapture(n)) {
+ F.setDoesNotCapture(n);
+ ++NumAnnotated;
+ }
+ }
+
+ void setOnlyReadsMemory(Function &F, unsigned n) {
+ if (!F.onlyReadsMemory(n)) {
+ F.setOnlyReadsMemory(n);
+ ++NumAnnotated;
+ }
+ }
+
+ void setDoesNotAlias(Function &F, unsigned n) {
+ if (!F.doesNotAlias(n)) {
+ F.setDoesNotAlias(n);
+ ++NumAnnotated;
+ }
+ }
+
+ // inferPrototypeAttributes - Analyze the name and prototype of the
+ // given function and set any applicable attributes. Returns true
+ // if any attributes were set and false otherwise.
+ bool inferPrototypeAttributes(Function &F);
+
+ // annotateLibraryCalls - Adds attributes to well-known standard library
+ // call declarations.
+ bool annotateLibraryCalls(const CallGraphSCC &SCC);
+
virtual void getAnalysisUsage(AnalysisUsage &AU) const {
AU.setPreservesCFG();
AU.addRequired<AliasAnalysis>();
+ AU.addRequired<TargetLibraryInfo>();
CallGraphSCCPass::getAnalysisUsage(AU);
}
private:
AliasAnalysis *AA;
+ TargetLibraryInfo *TLI;
};
}
char FunctionAttrs::ID = 0;
INITIALIZE_PASS_BEGIN(FunctionAttrs, "functionattrs",
"Deduce function attributes", false, false)
-INITIALIZE_AG_DEPENDENCY(CallGraph)
+INITIALIZE_AG_DEPENDENCY(AliasAnalysis)
+INITIALIZE_PASS_DEPENDENCY(CallGraphWrapperPass)
+INITIALIZE_PASS_DEPENDENCY(TargetLibraryInfo)
INITIALIZE_PASS_END(FunctionAttrs, "functionattrs",
"Deduce function attributes", false, false)
MadeChange = true;
// Clear out any existing attributes.
- F->removeAttribute(~0, Attribute::ReadOnly | Attribute::ReadNone);
+ AttrBuilder B;
+ B.addAttribute(Attribute::ReadOnly)
+ .addAttribute(Attribute::ReadNone);
+ F->removeAttributes(AttributeSet::FunctionIndex,
+ AttributeSet::get(F->getContext(),
+ AttributeSet::FunctionIndex, B));
// Add in the new attribute.
- F->addAttribute(~0, ReadsMemory? Attribute::ReadOnly : Attribute::ReadNone);
+ F->addAttribute(AttributeSet::FunctionIndex,
+ ReadsMemory ? Attribute::ReadOnly : Attribute::ReadNone);
if (ReadsMemory)
++NumReadOnly;
void tooManyUses() { Captured = true; }
- bool shouldExplore(Use *U) { return true; }
-
bool captured(Use *U) {
CallSite CS(U->getUser());
if (!CS.getInstruction()) { Captured = true; return true; }
Function *F = CS.getCalledFunction();
if (!F || !SCCNodes.count(F)) { Captured = true; return true; }
+ bool Found = false;
Function::arg_iterator AI = F->arg_begin(), AE = F->arg_end();
for (CallSite::arg_iterator PI = CS.arg_begin(), PE = CS.arg_end();
PI != PE; ++PI, ++AI) {
}
if (PI == U) {
Uses.push_back(AI);
+ Found = true;
break;
}
}
- assert(!Uses.empty() && "Capturing call-site captured nothing?");
+ assert(Found && "Capturing call-site captured nothing?");
+ (void)Found;
return false;
}
};
}
-/// AddNoCaptureAttrs - Deduce nocapture attributes for the SCC.
-bool FunctionAttrs::AddNoCaptureAttrs(const CallGraphSCC &SCC) {
+// Returns Attribute::None, Attribute::ReadOnly or Attribute::ReadNone.
+static Attribute::AttrKind
+determinePointerReadAttrs(Argument *A,
+ const SmallPtrSet<Argument*, 8> &SCCNodes) {
+
+ SmallVector<Use*, 32> Worklist;
+ SmallSet<Use*, 32> Visited;
+ int Count = 0;
+
+ bool IsRead = false;
+ // We don't need to track IsWritten. If A is written to, return immediately.
+
+ for (Value::use_iterator UI = A->use_begin(), UE = A->use_end();
+ UI != UE; ++UI) {
+ if (Count++ >= 20)
+ return Attribute::None;
+
+ Use *U = &UI.getUse();
+ Visited.insert(U);
+ Worklist.push_back(U);
+ }
+
+ while (!Worklist.empty()) {
+ Use *U = Worklist.pop_back_val();
+ Instruction *I = cast<Instruction>(U->getUser());
+ Value *V = U->get();
+
+ switch (I->getOpcode()) {
+ case Instruction::BitCast:
+ case Instruction::GetElementPtr:
+ case Instruction::PHI:
+ case Instruction::Select:
+ // The original value is not read/written via this if the new value isn't.
+ for (Instruction::use_iterator UI = I->use_begin(), UE = I->use_end();
+ UI != UE; ++UI) {
+ Use *U = &UI.getUse();
+ if (Visited.insert(U))
+ Worklist.push_back(U);
+ }
+ break;
+
+ case Instruction::Call:
+ case Instruction::Invoke: {
+ CallSite CS(I);
+ if (CS.doesNotAccessMemory())
+ continue;
+
+ Function *F = CS.getCalledFunction();
+ if (!F) {
+ if (CS.onlyReadsMemory()) {
+ IsRead = true;
+ continue;
+ }
+ return Attribute::None;
+ }
+
+ Function::arg_iterator AI = F->arg_begin(), AE = F->arg_end();
+ CallSite::arg_iterator B = CS.arg_begin(), E = CS.arg_end();
+ for (CallSite::arg_iterator A = B; A != E; ++A, ++AI) {
+ if (A->get() == V) {
+ if (AI == AE) {
+ assert(F->isVarArg() &&
+ "More params than args in non-varargs call.");
+ return Attribute::None;
+ }
+ if (SCCNodes.count(AI))
+ continue;
+ if (!CS.onlyReadsMemory() && !CS.onlyReadsMemory(A - B))
+ return Attribute::None;
+ if (!CS.doesNotAccessMemory(A - B))
+ IsRead = true;
+ }
+ }
+ break;
+ }
+
+ case Instruction::Load:
+ IsRead = true;
+ break;
+
+ case Instruction::ICmp:
+ case Instruction::Ret:
+ break;
+
+ default:
+ return Attribute::None;
+ }
+ }
+
+ return IsRead ? Attribute::ReadOnly : Attribute::ReadNone;
+}
+
+/// AddArgumentAttrs - Deduce nocapture attributes for the SCC.
+bool FunctionAttrs::AddArgumentAttrs(const CallGraphSCC &SCC) {
bool Changed = false;
SmallPtrSet<Function*, 8> SCCNodes;
ArgumentGraph AG;
+ AttrBuilder B;
+ B.addAttribute(Attribute::NoCapture);
+
// Check each function in turn, determining which pointer arguments are not
// captured.
for (CallGraphSCC::iterator I = SCC.begin(), E = SCC.end(); I != E; ++I) {
for (Function::arg_iterator A = F->arg_begin(), E = F->arg_end();
A != E; ++A) {
if (A->getType()->isPointerTy() && !A->hasNoCaptureAttr()) {
- A->addAttr(Attribute::NoCapture);
+ A->addAttr(AttributeSet::get(F->getContext(), A->getArgNo() + 1, B));
++NumNoCapture;
Changed = true;
}
continue;
}
- for (Function::arg_iterator A = F->arg_begin(), E = F->arg_end(); A!=E; ++A)
- if (A->getType()->isPointerTy() && !A->hasNoCaptureAttr()) {
+ for (Function::arg_iterator A = F->arg_begin(), E = F->arg_end();
+ A != E; ++A) {
+ if (!A->getType()->isPointerTy()) continue;
+ bool HasNonLocalUses = false;
+ if (!A->hasNoCaptureAttr()) {
ArgumentUsesTracker Tracker(SCCNodes);
PointerMayBeCaptured(A, &Tracker);
if (!Tracker.Captured) {
if (Tracker.Uses.empty()) {
// If it's trivially not captured, mark it nocapture now.
- A->addAttr(Attribute::NoCapture);
+ A->addAttr(AttributeSet::get(F->getContext(), A->getArgNo()+1, B));
++NumNoCapture;
Changed = true;
} else {
// its particulars for Argument-SCC analysis later.
ArgumentGraphNode *Node = AG[A];
for (SmallVectorImpl<Argument*>::iterator UI = Tracker.Uses.begin(),
- UE = Tracker.Uses.end(); UI != UE; ++UI)
+ UE = Tracker.Uses.end(); UI != UE; ++UI) {
Node->Uses.push_back(AG[*UI]);
+ if (*UI != A)
+ HasNonLocalUses = true;
+ }
}
}
// Otherwise, it's captured. Don't bother doing SCC analysis on it.
}
+ if (!HasNonLocalUses && !A->onlyReadsMemory()) {
+ // Can we determine that it's readonly/readnone without doing an SCC?
+ // Note that we don't allow any calls at all here, or else our result
+ // will be dependent on the iteration order through the functions in the
+ // SCC.
+ SmallPtrSet<Argument*, 8> Self;
+ Self.insert(A);
+ Attribute::AttrKind R = determinePointerReadAttrs(A, Self);
+ if (R != Attribute::None) {
+ AttrBuilder B;
+ B.addAttribute(R);
+ A->addAttr(AttributeSet::get(A->getContext(), A->getArgNo() + 1, B));
+ Changed = true;
+ R == Attribute::ReadOnly ? ++NumReadOnlyArg : ++NumReadNoneArg;
+ }
+ }
+ }
}
// The graph we've collected is partial because we stopped scanning for
// eg. "void f(int* x) { if (...) f(x); }"
if (ArgumentSCC[0]->Uses.size() == 1 &&
ArgumentSCC[0]->Uses[0] == ArgumentSCC[0]) {
- ArgumentSCC[0]->Definition->addAttr(Attribute::NoCapture);
+ Argument *A = ArgumentSCC[0]->Definition;
+ A->addAttr(AttributeSet::get(A->getContext(), A->getArgNo() + 1, B));
++NumNoCapture;
Changed = true;
}
}
if (SCCCaptured) continue;
- for (unsigned i = 0, e = ArgumentSCC.size(); i != e && !SCCCaptured; ++i) {
+ for (unsigned i = 0, e = ArgumentSCC.size(); i != e; ++i) {
Argument *A = ArgumentSCC[i]->Definition;
- A->addAttr(Attribute::NoCapture);
+ A->addAttr(AttributeSet::get(A->getContext(), A->getArgNo() + 1, B));
++NumNoCapture;
Changed = true;
}
+
+ // We also want to compute readonly/readnone. With a small number of false
+ // negatives, we can assume that any pointer which is captured isn't going
+ // to be provably readonly or readnone, since by definition we can't
+ // analyze all uses of a captured pointer.
+ //
+ // The false negatives happen when the pointer is captured by a function
+ // that promises readonly/readnone behaviour on the pointer, then the
+ // pointer's lifetime ends before anything that writes to arbitrary memory.
+ // Also, a readonly/readnone pointer may be returned, but returning a
+ // pointer is capturing it.
+
+ Attribute::AttrKind ReadAttr = Attribute::ReadNone;
+ for (unsigned i = 0, e = ArgumentSCC.size(); i != e; ++i) {
+ Argument *A = ArgumentSCC[i]->Definition;
+ Attribute::AttrKind K = determinePointerReadAttrs(A, ArgumentSCCNodes);
+ if (K == Attribute::ReadNone)
+ continue;
+ if (K == Attribute::ReadOnly) {
+ ReadAttr = Attribute::ReadOnly;
+ continue;
+ }
+ ReadAttr = K;
+ break;
+ }
+
+ if (ReadAttr != Attribute::None) {
+ AttrBuilder B;
+ B.addAttribute(ReadAttr);
+ for (unsigned i = 0, e = ArgumentSCC.size(); i != e; ++i) {
+ Argument *A = ArgumentSCC[i]->Definition;
+ A->addAttr(AttributeSet::get(A->getContext(), A->getArgNo() + 1, B));
+ ReadAttr == Attribute::ReadOnly ? ++NumReadOnlyArg : ++NumReadNoneArg;
+ Changed = true;
+ }
+ }
}
return Changed;
/// or a pointer that doesn't alias any other pointer visible to the caller.
bool FunctionAttrs::IsFunctionMallocLike(Function *F,
SmallPtrSet<Function*, 8> &SCCNodes) const {
- UniqueVector<Value *> FlowsToReturn;
+ SmallSetVector<Value *, 8> FlowsToReturn;
for (Function::iterator I = F->begin(), E = F->end(); I != E; ++I)
if (ReturnInst *Ret = dyn_cast<ReturnInst>(I->getTerminator()))
FlowsToReturn.insert(Ret->getReturnValue());
for (unsigned i = 0; i != FlowsToReturn.size(); ++i) {
- Value *RetVal = FlowsToReturn[i+1]; // UniqueVector[0] is reserved.
+ Value *RetVal = FlowsToReturn[i];
if (Constant *C = dyn_cast<Constant>(RetVal)) {
if (!C->isNullValue() && !isa<UndefValue>(C))
return MadeChange;
}
+/// inferPrototypeAttributes - Analyze the name and prototype of the
+/// given function and set any applicable attributes. Returns true
+/// if any attributes were set and false otherwise.
+bool FunctionAttrs::inferPrototypeAttributes(Function &F) {
+ FunctionType *FTy = F.getFunctionType();
+ LibFunc::Func TheLibFunc;
+ if (!(TLI->getLibFunc(F.getName(), TheLibFunc) && TLI->has(TheLibFunc)))
+ return false;
+
+ switch (TheLibFunc) {
+ case LibFunc::strlen:
+ if (FTy->getNumParams() != 1 || !FTy->getParamType(0)->isPointerTy())
+ return false;
+ setOnlyReadsMemory(F);
+ setDoesNotThrow(F);
+ setDoesNotCapture(F, 1);
+ break;
+ case LibFunc::strchr:
+ case LibFunc::strrchr:
+ if (FTy->getNumParams() != 2 ||
+ !FTy->getParamType(0)->isPointerTy() ||
+ !FTy->getParamType(1)->isIntegerTy())
+ return false;
+ setOnlyReadsMemory(F);
+ setDoesNotThrow(F);
+ break;
+ case LibFunc::strtol:
+ case LibFunc::strtod:
+ case LibFunc::strtof:
+ case LibFunc::strtoul:
+ case LibFunc::strtoll:
+ case LibFunc::strtold:
+ case LibFunc::strtoull:
+ if (FTy->getNumParams() < 2 ||
+ !FTy->getParamType(1)->isPointerTy())
+ return false;
+ setDoesNotThrow(F);
+ setDoesNotCapture(F, 2);
+ setOnlyReadsMemory(F, 1);
+ break;
+ case LibFunc::strcpy:
+ case LibFunc::stpcpy:
+ case LibFunc::strcat:
+ case LibFunc::strncat:
+ case LibFunc::strncpy:
+ case LibFunc::stpncpy:
+ if (FTy->getNumParams() < 2 ||
+ !FTy->getParamType(1)->isPointerTy())
+ return false;
+ setDoesNotThrow(F);
+ setDoesNotCapture(F, 2);
+ setOnlyReadsMemory(F, 2);
+ break;
+ case LibFunc::strxfrm:
+ if (FTy->getNumParams() != 3 ||
+ !FTy->getParamType(0)->isPointerTy() ||
+ !FTy->getParamType(1)->isPointerTy())
+ return false;
+ setDoesNotThrow(F);
+ setDoesNotCapture(F, 1);
+ setDoesNotCapture(F, 2);
+ setOnlyReadsMemory(F, 2);
+ break;
+ case LibFunc::strcmp: //0,1
+ case LibFunc::strspn: // 0,1
+ case LibFunc::strncmp: // 0,1
+ case LibFunc::strcspn: //0,1
+ case LibFunc::strcoll: //0,1
+ case LibFunc::strcasecmp: // 0,1
+ case LibFunc::strncasecmp: //
+ if (FTy->getNumParams() < 2 ||
+ !FTy->getParamType(0)->isPointerTy() ||
+ !FTy->getParamType(1)->isPointerTy())
+ return false;
+ setOnlyReadsMemory(F);
+ setDoesNotThrow(F);
+ setDoesNotCapture(F, 1);
+ setDoesNotCapture(F, 2);
+ break;
+ case LibFunc::strstr:
+ case LibFunc::strpbrk:
+ if (FTy->getNumParams() != 2 || !FTy->getParamType(1)->isPointerTy())
+ return false;
+ setOnlyReadsMemory(F);
+ setDoesNotThrow(F);
+ setDoesNotCapture(F, 2);
+ break;
+ case LibFunc::strtok:
+ case LibFunc::strtok_r:
+ if (FTy->getNumParams() < 2 || !FTy->getParamType(1)->isPointerTy())
+ return false;
+ setDoesNotThrow(F);
+ setDoesNotCapture(F, 2);
+ setOnlyReadsMemory(F, 2);
+ break;
+ case LibFunc::scanf:
+ if (FTy->getNumParams() < 1 || !FTy->getParamType(0)->isPointerTy())
+ return false;
+ setDoesNotThrow(F);
+ setDoesNotCapture(F, 1);
+ setOnlyReadsMemory(F, 1);
+ break;
+ case LibFunc::setbuf:
+ case LibFunc::setvbuf:
+ if (FTy->getNumParams() < 1 || !FTy->getParamType(0)->isPointerTy())
+ return false;
+ setDoesNotThrow(F);
+ setDoesNotCapture(F, 1);
+ break;
+ case LibFunc::strdup:
+ case LibFunc::strndup:
+ if (FTy->getNumParams() < 1 || !FTy->getReturnType()->isPointerTy() ||
+ !FTy->getParamType(0)->isPointerTy())
+ return false;
+ setDoesNotThrow(F);
+ setDoesNotAlias(F, 0);
+ setDoesNotCapture(F, 1);
+ setOnlyReadsMemory(F, 1);
+ break;
+ case LibFunc::stat:
+ case LibFunc::statvfs:
+ if (FTy->getNumParams() < 2 ||
+ !FTy->getParamType(0)->isPointerTy() ||
+ !FTy->getParamType(1)->isPointerTy())
+ return false;
+ setDoesNotThrow(F);
+ setDoesNotCapture(F, 1);
+ setDoesNotCapture(F, 2);
+ setOnlyReadsMemory(F, 1);
+ break;
+ case LibFunc::sscanf:
+ if (FTy->getNumParams() < 2 ||
+ !FTy->getParamType(0)->isPointerTy() ||
+ !FTy->getParamType(1)->isPointerTy())
+ return false;
+ setDoesNotThrow(F);
+ setDoesNotCapture(F, 1);
+ setDoesNotCapture(F, 2);
+ setOnlyReadsMemory(F, 1);
+ setOnlyReadsMemory(F, 2);
+ break;
+ case LibFunc::sprintf:
+ if (FTy->getNumParams() < 2 ||
+ !FTy->getParamType(0)->isPointerTy() ||
+ !FTy->getParamType(1)->isPointerTy())
+ return false;
+ setDoesNotThrow(F);
+ setDoesNotCapture(F, 1);
+ setDoesNotCapture(F, 2);
+ setOnlyReadsMemory(F, 2);
+ break;
+ case LibFunc::snprintf:
+ if (FTy->getNumParams() != 3 ||
+ !FTy->getParamType(0)->isPointerTy() ||
+ !FTy->getParamType(2)->isPointerTy())
+ return false;
+ setDoesNotThrow(F);
+ setDoesNotCapture(F, 1);
+ setDoesNotCapture(F, 3);
+ setOnlyReadsMemory(F, 3);
+ break;
+ case LibFunc::setitimer:
+ if (FTy->getNumParams() != 3 ||
+ !FTy->getParamType(1)->isPointerTy() ||
+ !FTy->getParamType(2)->isPointerTy())
+ return false;
+ setDoesNotThrow(F);
+ setDoesNotCapture(F, 2);
+ setDoesNotCapture(F, 3);
+ setOnlyReadsMemory(F, 2);
+ break;
+ case LibFunc::system:
+ if (FTy->getNumParams() != 1 ||
+ !FTy->getParamType(0)->isPointerTy())
+ return false;
+ // May throw; "system" is a valid pthread cancellation point.
+ setDoesNotCapture(F, 1);
+ setOnlyReadsMemory(F, 1);
+ break;
+ case LibFunc::malloc:
+ if (FTy->getNumParams() != 1 ||
+ !FTy->getReturnType()->isPointerTy())
+ return false;
+ setDoesNotThrow(F);
+ setDoesNotAlias(F, 0);
+ break;
+ case LibFunc::memcmp:
+ if (FTy->getNumParams() != 3 ||
+ !FTy->getParamType(0)->isPointerTy() ||
+ !FTy->getParamType(1)->isPointerTy())
+ return false;
+ setOnlyReadsMemory(F);
+ setDoesNotThrow(F);
+ setDoesNotCapture(F, 1);
+ setDoesNotCapture(F, 2);
+ break;
+ case LibFunc::memchr:
+ case LibFunc::memrchr:
+ if (FTy->getNumParams() != 3)
+ return false;
+ setOnlyReadsMemory(F);
+ setDoesNotThrow(F);
+ break;
+ case LibFunc::modf:
+ case LibFunc::modff:
+ case LibFunc::modfl:
+ if (FTy->getNumParams() < 2 ||
+ !FTy->getParamType(1)->isPointerTy())
+ return false;
+ setDoesNotThrow(F);
+ setDoesNotCapture(F, 2);
+ break;
+ case LibFunc::memcpy:
+ case LibFunc::memccpy:
+ case LibFunc::memmove:
+ if (FTy->getNumParams() < 2 ||
+ !FTy->getParamType(1)->isPointerTy())
+ return false;
+ setDoesNotThrow(F);
+ setDoesNotCapture(F, 2);
+ setOnlyReadsMemory(F, 2);
+ break;
+ case LibFunc::memalign:
+ if (!FTy->getReturnType()->isPointerTy())
+ return false;
+ setDoesNotAlias(F, 0);
+ break;
+ case LibFunc::mkdir:
+ if (FTy->getNumParams() == 0 ||
+ !FTy->getParamType(0)->isPointerTy())
+ return false;
+ setDoesNotThrow(F);
+ setDoesNotCapture(F, 1);
+ setOnlyReadsMemory(F, 1);
+ break;
+ case LibFunc::mktime:
+ if (FTy->getNumParams() == 0 ||
+ !FTy->getParamType(0)->isPointerTy())
+ return false;
+ setDoesNotThrow(F);
+ setDoesNotCapture(F, 1);
+ break;
+ case LibFunc::realloc:
+ if (FTy->getNumParams() != 2 ||
+ !FTy->getParamType(0)->isPointerTy() ||
+ !FTy->getReturnType()->isPointerTy())
+ return false;
+ setDoesNotThrow(F);
+ setDoesNotAlias(F, 0);
+ setDoesNotCapture(F, 1);
+ break;
+ case LibFunc::read:
+ if (FTy->getNumParams() != 3 ||
+ !FTy->getParamType(1)->isPointerTy())
+ return false;
+ // May throw; "read" is a valid pthread cancellation point.
+ setDoesNotCapture(F, 2);
+ break;
+ case LibFunc::rewind:
+ if (FTy->getNumParams() < 1 ||
+ !FTy->getParamType(0)->isPointerTy())
+ return false;
+ setDoesNotThrow(F);
+ setDoesNotCapture(F, 1);
+ break;
+ case LibFunc::rmdir:
+ case LibFunc::remove:
+ case LibFunc::realpath:
+ if (FTy->getNumParams() < 1 ||
+ !FTy->getParamType(0)->isPointerTy())
+ return false;
+ setDoesNotThrow(F);
+ setDoesNotCapture(F, 1);
+ setOnlyReadsMemory(F, 1);
+ break;
+ case LibFunc::rename:
+ if (FTy->getNumParams() < 2 ||
+ !FTy->getParamType(0)->isPointerTy() ||
+ !FTy->getParamType(1)->isPointerTy())
+ return false;
+ setDoesNotThrow(F);
+ setDoesNotCapture(F, 1);
+ setDoesNotCapture(F, 2);
+ setOnlyReadsMemory(F, 1);
+ setOnlyReadsMemory(F, 2);
+ break;
+ case LibFunc::readlink:
+ if (FTy->getNumParams() < 2 ||
+ !FTy->getParamType(0)->isPointerTy() ||
+ !FTy->getParamType(1)->isPointerTy())
+ return false;
+ setDoesNotThrow(F);
+ setDoesNotCapture(F, 1);
+ setDoesNotCapture(F, 2);
+ setOnlyReadsMemory(F, 1);
+ break;
+ case LibFunc::write:
+ if (FTy->getNumParams() != 3 || !FTy->getParamType(1)->isPointerTy())
+ return false;
+ // May throw; "write" is a valid pthread cancellation point.
+ setDoesNotCapture(F, 2);
+ setOnlyReadsMemory(F, 2);
+ break;
+ case LibFunc::bcopy:
+ if (FTy->getNumParams() != 3 ||
+ !FTy->getParamType(0)->isPointerTy() ||
+ !FTy->getParamType(1)->isPointerTy())
+ return false;
+ setDoesNotThrow(F);
+ setDoesNotCapture(F, 1);
+ setDoesNotCapture(F, 2);
+ setOnlyReadsMemory(F, 1);
+ break;
+ case LibFunc::bcmp:
+ if (FTy->getNumParams() != 3 ||
+ !FTy->getParamType(0)->isPointerTy() ||
+ !FTy->getParamType(1)->isPointerTy())
+ return false;
+ setDoesNotThrow(F);
+ setOnlyReadsMemory(F);
+ setDoesNotCapture(F, 1);
+ setDoesNotCapture(F, 2);
+ break;
+ case LibFunc::bzero:
+ if (FTy->getNumParams() != 2 || !FTy->getParamType(0)->isPointerTy())
+ return false;
+ setDoesNotThrow(F);
+ setDoesNotCapture(F, 1);
+ break;
+ case LibFunc::calloc:
+ if (FTy->getNumParams() != 2 ||
+ !FTy->getReturnType()->isPointerTy())
+ return false;
+ setDoesNotThrow(F);
+ setDoesNotAlias(F, 0);
+ break;
+ case LibFunc::chmod:
+ case LibFunc::chown:
+ if (FTy->getNumParams() == 0 || !FTy->getParamType(0)->isPointerTy())
+ return false;
+ setDoesNotThrow(F);
+ setDoesNotCapture(F, 1);
+ setOnlyReadsMemory(F, 1);
+ break;
+ case LibFunc::ctermid:
+ case LibFunc::clearerr:
+ case LibFunc::closedir:
+ if (FTy->getNumParams() == 0 || !FTy->getParamType(0)->isPointerTy())
+ return false;
+ setDoesNotThrow(F);
+ setDoesNotCapture(F, 1);
+ break;
+ case LibFunc::atoi:
+ case LibFunc::atol:
+ case LibFunc::atof:
+ case LibFunc::atoll:
+ if (FTy->getNumParams() != 1 || !FTy->getParamType(0)->isPointerTy())
+ return false;
+ setDoesNotThrow(F);
+ setOnlyReadsMemory(F);
+ setDoesNotCapture(F, 1);
+ break;
+ case LibFunc::access:
+ if (FTy->getNumParams() != 2 || !FTy->getParamType(0)->isPointerTy())
+ return false;
+ setDoesNotThrow(F);
+ setDoesNotCapture(F, 1);
+ setOnlyReadsMemory(F, 1);
+ break;
+ case LibFunc::fopen:
+ if (FTy->getNumParams() != 2 ||
+ !FTy->getReturnType()->isPointerTy() ||
+ !FTy->getParamType(0)->isPointerTy() ||
+ !FTy->getParamType(1)->isPointerTy())
+ return false;
+ setDoesNotThrow(F);
+ setDoesNotAlias(F, 0);
+ setDoesNotCapture(F, 1);
+ setDoesNotCapture(F, 2);
+ setOnlyReadsMemory(F, 1);
+ setOnlyReadsMemory(F, 2);
+ break;
+ case LibFunc::fdopen:
+ if (FTy->getNumParams() != 2 ||
+ !FTy->getReturnType()->isPointerTy() ||
+ !FTy->getParamType(1)->isPointerTy())
+ return false;
+ setDoesNotThrow(F);
+ setDoesNotAlias(F, 0);
+ setDoesNotCapture(F, 2);
+ setOnlyReadsMemory(F, 2);
+ break;
+ case LibFunc::feof:
+ case LibFunc::free:
+ case LibFunc::fseek:
+ case LibFunc::ftell:
+ case LibFunc::fgetc:
+ case LibFunc::fseeko:
+ case LibFunc::ftello:
+ case LibFunc::fileno:
+ case LibFunc::fflush:
+ case LibFunc::fclose:
+ case LibFunc::fsetpos:
+ case LibFunc::flockfile:
+ case LibFunc::funlockfile:
+ case LibFunc::ftrylockfile:
+ if (FTy->getNumParams() == 0 || !FTy->getParamType(0)->isPointerTy())
+ return false;
+ setDoesNotThrow(F);
+ setDoesNotCapture(F, 1);
+ break;
+ case LibFunc::ferror:
+ if (FTy->getNumParams() != 1 || !FTy->getParamType(0)->isPointerTy())
+ return false;
+ setDoesNotThrow(F);
+ setDoesNotCapture(F, 1);
+ setOnlyReadsMemory(F);
+ break;
+ case LibFunc::fputc:
+ case LibFunc::fstat:
+ case LibFunc::frexp:
+ case LibFunc::frexpf:
+ case LibFunc::frexpl:
+ case LibFunc::fstatvfs:
+ if (FTy->getNumParams() != 2 || !FTy->getParamType(1)->isPointerTy())
+ return false;
+ setDoesNotThrow(F);
+ setDoesNotCapture(F, 2);
+ break;
+ case LibFunc::fgets:
+ if (FTy->getNumParams() != 3 ||
+ !FTy->getParamType(0)->isPointerTy() ||
+ !FTy->getParamType(2)->isPointerTy())
+ return false;
+ setDoesNotThrow(F);
+ setDoesNotCapture(F, 3);
+ break;
+ case LibFunc::fread:
+ if (FTy->getNumParams() != 4 ||
+ !FTy->getParamType(0)->isPointerTy() ||
+ !FTy->getParamType(3)->isPointerTy())
+ return false;
+ setDoesNotThrow(F);
+ setDoesNotCapture(F, 1);
+ setDoesNotCapture(F, 4);
+ break;
+ case LibFunc::fwrite:
+ if (FTy->getNumParams() != 4 ||
+ !FTy->getParamType(0)->isPointerTy() ||
+ !FTy->getParamType(3)->isPointerTy())
+ return false;
+ setDoesNotThrow(F);
+ setDoesNotCapture(F, 1);
+ setDoesNotCapture(F, 4);
+ break;
+ case LibFunc::fputs:
+ if (FTy->getNumParams() < 2 ||
+ !FTy->getParamType(0)->isPointerTy() ||
+ !FTy->getParamType(1)->isPointerTy())
+ return false;
+ setDoesNotThrow(F);
+ setDoesNotCapture(F, 1);
+ setDoesNotCapture(F, 2);
+ setOnlyReadsMemory(F, 1);
+ break;
+ case LibFunc::fscanf:
+ case LibFunc::fprintf:
+ if (FTy->getNumParams() < 2 ||
+ !FTy->getParamType(0)->isPointerTy() ||
+ !FTy->getParamType(1)->isPointerTy())
+ return false;
+ setDoesNotThrow(F);
+ setDoesNotCapture(F, 1);
+ setDoesNotCapture(F, 2);
+ setOnlyReadsMemory(F, 2);
+ break;
+ case LibFunc::fgetpos:
+ if (FTy->getNumParams() < 2 ||
+ !FTy->getParamType(0)->isPointerTy() ||
+ !FTy->getParamType(1)->isPointerTy())
+ return false;
+ setDoesNotThrow(F);
+ setDoesNotCapture(F, 1);
+ setDoesNotCapture(F, 2);
+ break;
+ case LibFunc::getc:
+ case LibFunc::getlogin_r:
+ case LibFunc::getc_unlocked:
+ if (FTy->getNumParams() == 0 || !FTy->getParamType(0)->isPointerTy())
+ return false;
+ setDoesNotThrow(F);
+ setDoesNotCapture(F, 1);
+ break;
+ case LibFunc::getenv:
+ if (FTy->getNumParams() != 1 || !FTy->getParamType(0)->isPointerTy())
+ return false;
+ setDoesNotThrow(F);
+ setOnlyReadsMemory(F);
+ setDoesNotCapture(F, 1);
+ break;
+ case LibFunc::gets:
+ case LibFunc::getchar:
+ setDoesNotThrow(F);
+ break;
+ case LibFunc::getitimer:
+ if (FTy->getNumParams() != 2 || !FTy->getParamType(1)->isPointerTy())
+ return false;
+ setDoesNotThrow(F);
+ setDoesNotCapture(F, 2);
+ break;
+ case LibFunc::getpwnam:
+ if (FTy->getNumParams() != 1 || !FTy->getParamType(0)->isPointerTy())
+ return false;
+ setDoesNotThrow(F);
+ setDoesNotCapture(F, 1);
+ setOnlyReadsMemory(F, 1);
+ break;
+ case LibFunc::ungetc:
+ if (FTy->getNumParams() != 2 || !FTy->getParamType(1)->isPointerTy())
+ return false;
+ setDoesNotThrow(F);
+ setDoesNotCapture(F, 2);
+ break;
+ case LibFunc::uname:
+ if (FTy->getNumParams() != 1 || !FTy->getParamType(0)->isPointerTy())
+ return false;
+ setDoesNotThrow(F);
+ setDoesNotCapture(F, 1);
+ break;
+ case LibFunc::unlink:
+ if (FTy->getNumParams() != 1 || !FTy->getParamType(0)->isPointerTy())
+ return false;
+ setDoesNotThrow(F);
+ setDoesNotCapture(F, 1);
+ setOnlyReadsMemory(F, 1);
+ break;
+ case LibFunc::unsetenv:
+ if (FTy->getNumParams() != 1 || !FTy->getParamType(0)->isPointerTy())
+ return false;
+ setDoesNotThrow(F);
+ setDoesNotCapture(F, 1);
+ setOnlyReadsMemory(F, 1);
+ break;
+ case LibFunc::utime:
+ case LibFunc::utimes:
+ if (FTy->getNumParams() != 2 ||
+ !FTy->getParamType(0)->isPointerTy() ||
+ !FTy->getParamType(1)->isPointerTy())
+ return false;
+ setDoesNotThrow(F);
+ setDoesNotCapture(F, 1);
+ setDoesNotCapture(F, 2);
+ setOnlyReadsMemory(F, 1);
+ setOnlyReadsMemory(F, 2);
+ break;
+ case LibFunc::putc:
+ if (FTy->getNumParams() != 2 || !FTy->getParamType(1)->isPointerTy())
+ return false;
+ setDoesNotThrow(F);
+ setDoesNotCapture(F, 2);
+ break;
+ case LibFunc::puts:
+ case LibFunc::printf:
+ case LibFunc::perror:
+ if (FTy->getNumParams() != 1 || !FTy->getParamType(0)->isPointerTy())
+ return false;
+ setDoesNotThrow(F);
+ setDoesNotCapture(F, 1);
+ setOnlyReadsMemory(F, 1);
+ break;
+ case LibFunc::pread:
+ if (FTy->getNumParams() != 4 || !FTy->getParamType(1)->isPointerTy())
+ return false;
+ // May throw; "pread" is a valid pthread cancellation point.
+ setDoesNotCapture(F, 2);
+ break;
+ case LibFunc::pwrite:
+ if (FTy->getNumParams() != 4 || !FTy->getParamType(1)->isPointerTy())
+ return false;
+ // May throw; "pwrite" is a valid pthread cancellation point.
+ setDoesNotCapture(F, 2);
+ setOnlyReadsMemory(F, 2);
+ break;
+ case LibFunc::putchar:
+ setDoesNotThrow(F);
+ break;
+ case LibFunc::popen:
+ if (FTy->getNumParams() != 2 ||
+ !FTy->getReturnType()->isPointerTy() ||
+ !FTy->getParamType(0)->isPointerTy() ||
+ !FTy->getParamType(1)->isPointerTy())
+ return false;
+ setDoesNotThrow(F);
+ setDoesNotAlias(F, 0);
+ setDoesNotCapture(F, 1);
+ setDoesNotCapture(F, 2);
+ setOnlyReadsMemory(F, 1);
+ setOnlyReadsMemory(F, 2);
+ break;
+ case LibFunc::pclose:
+ if (FTy->getNumParams() != 1 || !FTy->getParamType(0)->isPointerTy())
+ return false;
+ setDoesNotThrow(F);
+ setDoesNotCapture(F, 1);
+ break;
+ case LibFunc::vscanf:
+ if (FTy->getNumParams() != 2 || !FTy->getParamType(1)->isPointerTy())
+ return false;
+ setDoesNotThrow(F);
+ setDoesNotCapture(F, 1);
+ setOnlyReadsMemory(F, 1);
+ break;
+ case LibFunc::vsscanf:
+ if (FTy->getNumParams() != 3 ||
+ !FTy->getParamType(1)->isPointerTy() ||
+ !FTy->getParamType(2)->isPointerTy())
+ return false;
+ setDoesNotThrow(F);
+ setDoesNotCapture(F, 1);
+ setDoesNotCapture(F, 2);
+ setOnlyReadsMemory(F, 1);
+ setOnlyReadsMemory(F, 2);
+ break;
+ case LibFunc::vfscanf:
+ if (FTy->getNumParams() != 3 ||
+ !FTy->getParamType(1)->isPointerTy() ||
+ !FTy->getParamType(2)->isPointerTy())
+ return false;
+ setDoesNotThrow(F);
+ setDoesNotCapture(F, 1);
+ setDoesNotCapture(F, 2);
+ setOnlyReadsMemory(F, 2);
+ break;
+ case LibFunc::valloc:
+ if (!FTy->getReturnType()->isPointerTy())
+ return false;
+ setDoesNotThrow(F);
+ setDoesNotAlias(F, 0);
+ break;
+ case LibFunc::vprintf:
+ if (FTy->getNumParams() != 2 || !FTy->getParamType(0)->isPointerTy())
+ return false;
+ setDoesNotThrow(F);
+ setDoesNotCapture(F, 1);
+ setOnlyReadsMemory(F, 1);
+ break;
+ case LibFunc::vfprintf:
+ case LibFunc::vsprintf:
+ if (FTy->getNumParams() != 3 ||
+ !FTy->getParamType(0)->isPointerTy() ||
+ !FTy->getParamType(1)->isPointerTy())
+ return false;
+ setDoesNotThrow(F);
+ setDoesNotCapture(F, 1);
+ setDoesNotCapture(F, 2);
+ setOnlyReadsMemory(F, 2);
+ break;
+ case LibFunc::vsnprintf:
+ if (FTy->getNumParams() != 4 ||
+ !FTy->getParamType(0)->isPointerTy() ||
+ !FTy->getParamType(2)->isPointerTy())
+ return false;
+ setDoesNotThrow(F);
+ setDoesNotCapture(F, 1);
+ setDoesNotCapture(F, 3);
+ setOnlyReadsMemory(F, 3);
+ break;
+ case LibFunc::open:
+ if (FTy->getNumParams() < 2 || !FTy->getParamType(0)->isPointerTy())
+ return false;
+ // May throw; "open" is a valid pthread cancellation point.
+ setDoesNotCapture(F, 1);
+ setOnlyReadsMemory(F, 1);
+ break;
+ case LibFunc::opendir:
+ if (FTy->getNumParams() != 1 ||
+ !FTy->getReturnType()->isPointerTy() ||
+ !FTy->getParamType(0)->isPointerTy())
+ return false;
+ setDoesNotThrow(F);
+ setDoesNotAlias(F, 0);
+ setDoesNotCapture(F, 1);
+ setOnlyReadsMemory(F, 1);
+ break;
+ case LibFunc::tmpfile:
+ if (!FTy->getReturnType()->isPointerTy())
+ return false;
+ setDoesNotThrow(F);
+ setDoesNotAlias(F, 0);
+ break;
+ case LibFunc::times:
+ if (FTy->getNumParams() != 1 || !FTy->getParamType(0)->isPointerTy())
+ return false;
+ setDoesNotThrow(F);
+ setDoesNotCapture(F, 1);
+ break;
+ case LibFunc::htonl:
+ case LibFunc::htons:
+ case LibFunc::ntohl:
+ case LibFunc::ntohs:
+ setDoesNotThrow(F);
+ setDoesNotAccessMemory(F);
+ break;
+ case LibFunc::lstat:
+ if (FTy->getNumParams() != 2 ||
+ !FTy->getParamType(0)->isPointerTy() ||
+ !FTy->getParamType(1)->isPointerTy())
+ return false;
+ setDoesNotThrow(F);
+ setDoesNotCapture(F, 1);
+ setDoesNotCapture(F, 2);
+ setOnlyReadsMemory(F, 1);
+ break;
+ case LibFunc::lchown:
+ if (FTy->getNumParams() != 3 || !FTy->getParamType(0)->isPointerTy())
+ return false;
+ setDoesNotThrow(F);
+ setDoesNotCapture(F, 1);
+ setOnlyReadsMemory(F, 1);
+ break;
+ case LibFunc::qsort:
+ if (FTy->getNumParams() != 4 || !FTy->getParamType(3)->isPointerTy())
+ return false;
+ // May throw; places call through function pointer.
+ setDoesNotCapture(F, 4);
+ break;
+ case LibFunc::dunder_strdup:
+ case LibFunc::dunder_strndup:
+ if (FTy->getNumParams() < 1 ||
+ !FTy->getReturnType()->isPointerTy() ||
+ !FTy->getParamType(0)->isPointerTy())
+ return false;
+ setDoesNotThrow(F);
+ setDoesNotAlias(F, 0);
+ setDoesNotCapture(F, 1);
+ setOnlyReadsMemory(F, 1);
+ break;
+ case LibFunc::dunder_strtok_r:
+ if (FTy->getNumParams() != 3 ||
+ !FTy->getParamType(1)->isPointerTy())
+ return false;
+ setDoesNotThrow(F);
+ setDoesNotCapture(F, 2);
+ setOnlyReadsMemory(F, 2);
+ break;
+ case LibFunc::under_IO_getc:
+ if (FTy->getNumParams() != 1 || !FTy->getParamType(0)->isPointerTy())
+ return false;
+ setDoesNotThrow(F);
+ setDoesNotCapture(F, 1);
+ break;
+ case LibFunc::under_IO_putc:
+ if (FTy->getNumParams() != 2 || !FTy->getParamType(1)->isPointerTy())
+ return false;
+ setDoesNotThrow(F);
+ setDoesNotCapture(F, 2);
+ break;
+ case LibFunc::dunder_isoc99_scanf:
+ if (FTy->getNumParams() < 1 ||
+ !FTy->getParamType(0)->isPointerTy())
+ return false;
+ setDoesNotThrow(F);
+ setDoesNotCapture(F, 1);
+ setOnlyReadsMemory(F, 1);
+ break;
+ case LibFunc::stat64:
+ case LibFunc::lstat64:
+ case LibFunc::statvfs64:
+ if (FTy->getNumParams() < 1 ||
+ !FTy->getParamType(0)->isPointerTy() ||
+ !FTy->getParamType(1)->isPointerTy())
+ return false;
+ setDoesNotThrow(F);
+ setDoesNotCapture(F, 1);
+ setDoesNotCapture(F, 2);
+ setOnlyReadsMemory(F, 1);
+ break;
+ case LibFunc::dunder_isoc99_sscanf:
+ if (FTy->getNumParams() < 1 ||
+ !FTy->getParamType(0)->isPointerTy() ||
+ !FTy->getParamType(1)->isPointerTy())
+ return false;
+ setDoesNotThrow(F);
+ setDoesNotCapture(F, 1);
+ setDoesNotCapture(F, 2);
+ setOnlyReadsMemory(F, 1);
+ setOnlyReadsMemory(F, 2);
+ break;
+ case LibFunc::fopen64:
+ if (FTy->getNumParams() != 2 ||
+ !FTy->getReturnType()->isPointerTy() ||
+ !FTy->getParamType(0)->isPointerTy() ||
+ !FTy->getParamType(1)->isPointerTy())
+ return false;
+ setDoesNotThrow(F);
+ setDoesNotAlias(F, 0);
+ setDoesNotCapture(F, 1);
+ setDoesNotCapture(F, 2);
+ setOnlyReadsMemory(F, 1);
+ setOnlyReadsMemory(F, 2);
+ break;
+ case LibFunc::fseeko64:
+ case LibFunc::ftello64:
+ if (FTy->getNumParams() == 0 || !FTy->getParamType(0)->isPointerTy())
+ return false;
+ setDoesNotThrow(F);
+ setDoesNotCapture(F, 1);
+ break;
+ case LibFunc::tmpfile64:
+ if (!FTy->getReturnType()->isPointerTy())
+ return false;
+ setDoesNotThrow(F);
+ setDoesNotAlias(F, 0);
+ break;
+ case LibFunc::fstat64:
+ case LibFunc::fstatvfs64:
+ if (FTy->getNumParams() != 2 || !FTy->getParamType(1)->isPointerTy())
+ return false;
+ setDoesNotThrow(F);
+ setDoesNotCapture(F, 2);
+ break;
+ case LibFunc::open64:
+ if (FTy->getNumParams() < 2 || !FTy->getParamType(0)->isPointerTy())
+ return false;
+ // May throw; "open" is a valid pthread cancellation point.
+ setDoesNotCapture(F, 1);
+ setOnlyReadsMemory(F, 1);
+ break;
+ case LibFunc::gettimeofday:
+ if (FTy->getNumParams() != 2 || !FTy->getParamType(0)->isPointerTy() ||
+ !FTy->getParamType(1)->isPointerTy())
+ return false;
+ // Currently some platforms have the restrict keyword on the arguments to
+ // gettimeofday. To be conservative, do not add noalias to gettimeofday's
+ // arguments.
+ setDoesNotThrow(F);
+ setDoesNotCapture(F, 1);
+ setDoesNotCapture(F, 2);
+ default:
+ // Didn't mark any attributes.
+ return false;
+ }
+
+ return true;
+}
+
+/// annotateLibraryCalls - Adds attributes to well-known standard library
+/// call declarations.
+bool FunctionAttrs::annotateLibraryCalls(const CallGraphSCC &SCC) {
+ bool MadeChange = false;
+
+ // Check each function in turn annotating well-known library function
+ // declarations with attributes.
+ for (CallGraphSCC::iterator I = SCC.begin(), E = SCC.end(); I != E; ++I) {
+ Function *F = (*I)->getFunction();
+
+ if (F != 0 && F->isDeclaration())
+ MadeChange |= inferPrototypeAttributes(*F);
+ }
+
+ return MadeChange;
+}
+
bool FunctionAttrs::runOnSCC(CallGraphSCC &SCC) {
AA = &getAnalysis<AliasAnalysis>();
+ TLI = &getAnalysis<TargetLibraryInfo>();
- bool Changed = AddReadAttrs(SCC);
- Changed |= AddNoCaptureAttrs(SCC);
+ bool Changed = annotateLibraryCalls(SCC);
+ Changed |= AddReadAttrs(SCC);
+ Changed |= AddArgumentAttrs(SCC);
Changed |= AddNoAliasAttrs(SCC);
return Changed;
}
projects / oota-llvm.git / blobdiff