forked from OSchip/llvm-project
1016 lines
34 KiB
C++
1016 lines
34 KiB
C++
//===- BuildLibCalls.cpp - Utility builder for libcalls -------------------===//
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//
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// The LLVM Compiler Infrastructure
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//
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// This file is distributed under the University of Illinois Open Source
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// License. See LICENSE.TXT for details.
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//
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//===----------------------------------------------------------------------===//
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//
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// This file implements some functions that will create standard C libcalls.
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//
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//===----------------------------------------------------------------------===//
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#include "llvm/Transforms/Utils/BuildLibCalls.h"
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#include "llvm/ADT/SmallString.h"
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#include "llvm/ADT/Statistic.h"
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#include "llvm/Analysis/TargetLibraryInfo.h"
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#include "llvm/IR/Constants.h"
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#include "llvm/IR/DataLayout.h"
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#include "llvm/IR/Function.h"
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#include "llvm/IR/IRBuilder.h"
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#include "llvm/IR/Intrinsics.h"
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#include "llvm/IR/LLVMContext.h"
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#include "llvm/IR/Module.h"
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#include "llvm/IR/Type.h"
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using namespace llvm;
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#define DEBUG_TYPE "build-libcalls"
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//- Infer Attributes ---------------------------------------------------------//
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STATISTIC(NumReadNone, "Number of functions inferred as readnone");
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STATISTIC(NumReadOnly, "Number of functions inferred as readonly");
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STATISTIC(NumArgMemOnly, "Number of functions inferred as argmemonly");
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STATISTIC(NumNoUnwind, "Number of functions inferred as nounwind");
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STATISTIC(NumNoCapture, "Number of arguments inferred as nocapture");
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STATISTIC(NumReadOnlyArg, "Number of arguments inferred as readonly");
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STATISTIC(NumNoAlias, "Number of function returns inferred as noalias");
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STATISTIC(NumNonNull, "Number of function returns inferred as nonnull returns");
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static bool setDoesNotAccessMemory(Function &F) {
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if (F.doesNotAccessMemory())
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return false;
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F.setDoesNotAccessMemory();
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++NumReadNone;
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return true;
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}
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static bool setOnlyReadsMemory(Function &F) {
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if (F.onlyReadsMemory())
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return false;
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F.setOnlyReadsMemory();
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++NumReadOnly;
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return true;
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}
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static bool setOnlyAccessesArgMemory(Function &F) {
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if (F.onlyAccessesArgMemory())
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return false;
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F.setOnlyAccessesArgMemory();
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++NumArgMemOnly;
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return true;
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}
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static bool setDoesNotThrow(Function &F) {
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if (F.doesNotThrow())
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return false;
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F.setDoesNotThrow();
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++NumNoUnwind;
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return true;
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}
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static bool setRetDoesNotAlias(Function &F) {
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if (F.hasAttribute(AttributeList::ReturnIndex, Attribute::NoAlias))
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return false;
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F.addAttribute(AttributeList::ReturnIndex, Attribute::NoAlias);
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++NumNoAlias;
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return true;
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}
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static bool setDoesNotCapture(Function &F, unsigned ArgNo) {
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if (F.hasParamAttribute(ArgNo, Attribute::NoCapture))
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return false;
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F.addParamAttr(ArgNo, Attribute::NoCapture);
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++NumNoCapture;
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return true;
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}
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static bool setOnlyReadsMemory(Function &F, unsigned ArgNo) {
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if (F.hasParamAttribute(ArgNo, Attribute::ReadOnly))
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return false;
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F.addParamAttr(ArgNo, Attribute::ReadOnly);
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++NumReadOnlyArg;
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return true;
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}
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static bool setRetNonNull(Function &F) {
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assert(F.getReturnType()->isPointerTy() &&
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"nonnull applies only to pointers");
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if (F.hasAttribute(AttributeList::ReturnIndex, Attribute::NonNull))
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return false;
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F.addAttribute(AttributeList::ReturnIndex, Attribute::NonNull);
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++NumNonNull;
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return true;
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}
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bool llvm::inferLibFuncAttributes(Function &F, const TargetLibraryInfo &TLI) {
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LibFunc TheLibFunc;
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if (!(TLI.getLibFunc(F, TheLibFunc) && TLI.has(TheLibFunc)))
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return false;
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bool Changed = false;
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switch (TheLibFunc) {
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case LibFunc_strlen:
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case LibFunc_wcslen:
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Changed |= setOnlyReadsMemory(F);
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Changed |= setDoesNotThrow(F);
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Changed |= setOnlyAccessesArgMemory(F);
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Changed |= setDoesNotCapture(F, 0);
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return Changed;
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case LibFunc_strchr:
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case LibFunc_strrchr:
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Changed |= setOnlyReadsMemory(F);
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Changed |= setDoesNotThrow(F);
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return Changed;
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case LibFunc_strtol:
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case LibFunc_strtod:
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case LibFunc_strtof:
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case LibFunc_strtoul:
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case LibFunc_strtoll:
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case LibFunc_strtold:
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case LibFunc_strtoull:
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Changed |= setDoesNotThrow(F);
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Changed |= setDoesNotCapture(F, 1);
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Changed |= setOnlyReadsMemory(F, 0);
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return Changed;
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case LibFunc_strcpy:
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case LibFunc_stpcpy:
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case LibFunc_strcat:
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case LibFunc_strncat:
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case LibFunc_strncpy:
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case LibFunc_stpncpy:
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Changed |= setDoesNotThrow(F);
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Changed |= setDoesNotCapture(F, 1);
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Changed |= setOnlyReadsMemory(F, 1);
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return Changed;
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case LibFunc_strxfrm:
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Changed |= setDoesNotThrow(F);
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Changed |= setDoesNotCapture(F, 0);
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Changed |= setDoesNotCapture(F, 1);
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Changed |= setOnlyReadsMemory(F, 1);
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return Changed;
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case LibFunc_strcmp: // 0,1
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case LibFunc_strspn: // 0,1
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case LibFunc_strncmp: // 0,1
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case LibFunc_strcspn: // 0,1
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case LibFunc_strcoll: // 0,1
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case LibFunc_strcasecmp: // 0,1
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case LibFunc_strncasecmp: //
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Changed |= setOnlyReadsMemory(F);
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Changed |= setDoesNotThrow(F);
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Changed |= setDoesNotCapture(F, 0);
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Changed |= setDoesNotCapture(F, 1);
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return Changed;
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case LibFunc_strstr:
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case LibFunc_strpbrk:
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Changed |= setOnlyReadsMemory(F);
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Changed |= setDoesNotThrow(F);
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Changed |= setDoesNotCapture(F, 1);
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return Changed;
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case LibFunc_strtok:
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case LibFunc_strtok_r:
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Changed |= setDoesNotThrow(F);
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Changed |= setDoesNotCapture(F, 1);
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Changed |= setOnlyReadsMemory(F, 1);
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return Changed;
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case LibFunc_scanf:
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Changed |= setDoesNotThrow(F);
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Changed |= setDoesNotCapture(F, 0);
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Changed |= setOnlyReadsMemory(F, 0);
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return Changed;
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case LibFunc_setbuf:
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case LibFunc_setvbuf:
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Changed |= setDoesNotThrow(F);
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Changed |= setDoesNotCapture(F, 0);
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return Changed;
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case LibFunc_strdup:
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case LibFunc_strndup:
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Changed |= setDoesNotThrow(F);
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Changed |= setRetDoesNotAlias(F);
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Changed |= setDoesNotCapture(F, 0);
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Changed |= setOnlyReadsMemory(F, 0);
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return Changed;
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case LibFunc_stat:
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case LibFunc_statvfs:
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Changed |= setDoesNotThrow(F);
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Changed |= setDoesNotCapture(F, 0);
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Changed |= setDoesNotCapture(F, 1);
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Changed |= setOnlyReadsMemory(F, 0);
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return Changed;
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case LibFunc_sscanf:
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Changed |= setDoesNotThrow(F);
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Changed |= setDoesNotCapture(F, 0);
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Changed |= setDoesNotCapture(F, 1);
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Changed |= setOnlyReadsMemory(F, 0);
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Changed |= setOnlyReadsMemory(F, 1);
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return Changed;
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case LibFunc_sprintf:
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Changed |= setDoesNotThrow(F);
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Changed |= setDoesNotCapture(F, 0);
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Changed |= setDoesNotCapture(F, 1);
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Changed |= setOnlyReadsMemory(F, 1);
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return Changed;
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case LibFunc_snprintf:
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Changed |= setDoesNotThrow(F);
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Changed |= setDoesNotCapture(F, 0);
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Changed |= setDoesNotCapture(F, 2);
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Changed |= setOnlyReadsMemory(F, 2);
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return Changed;
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case LibFunc_setitimer:
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Changed |= setDoesNotThrow(F);
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Changed |= setDoesNotCapture(F, 1);
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Changed |= setDoesNotCapture(F, 2);
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Changed |= setOnlyReadsMemory(F, 1);
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return Changed;
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case LibFunc_system:
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// May throw; "system" is a valid pthread cancellation point.
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Changed |= setDoesNotCapture(F, 0);
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Changed |= setOnlyReadsMemory(F, 0);
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return Changed;
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case LibFunc_malloc:
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Changed |= setDoesNotThrow(F);
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Changed |= setRetDoesNotAlias(F);
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return Changed;
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case LibFunc_memcmp:
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Changed |= setOnlyReadsMemory(F);
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Changed |= setDoesNotThrow(F);
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Changed |= setDoesNotCapture(F, 0);
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Changed |= setDoesNotCapture(F, 1);
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return Changed;
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case LibFunc_memchr:
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case LibFunc_memrchr:
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Changed |= setOnlyReadsMemory(F);
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Changed |= setDoesNotThrow(F);
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return Changed;
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case LibFunc_modf:
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case LibFunc_modff:
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case LibFunc_modfl:
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Changed |= setDoesNotThrow(F);
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Changed |= setDoesNotCapture(F, 1);
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return Changed;
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case LibFunc_memcpy:
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case LibFunc_mempcpy:
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case LibFunc_memccpy:
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case LibFunc_memmove:
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Changed |= setDoesNotThrow(F);
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Changed |= setDoesNotCapture(F, 1);
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Changed |= setOnlyReadsMemory(F, 1);
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return Changed;
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case LibFunc_memcpy_chk:
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Changed |= setDoesNotThrow(F);
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return Changed;
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case LibFunc_memalign:
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Changed |= setRetDoesNotAlias(F);
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return Changed;
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case LibFunc_mkdir:
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Changed |= setDoesNotThrow(F);
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Changed |= setDoesNotCapture(F, 0);
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Changed |= setOnlyReadsMemory(F, 0);
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return Changed;
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case LibFunc_mktime:
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Changed |= setDoesNotThrow(F);
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Changed |= setDoesNotCapture(F, 0);
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return Changed;
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case LibFunc_realloc:
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Changed |= setDoesNotThrow(F);
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Changed |= setRetDoesNotAlias(F);
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Changed |= setDoesNotCapture(F, 0);
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return Changed;
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case LibFunc_read:
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// May throw; "read" is a valid pthread cancellation point.
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Changed |= setDoesNotCapture(F, 1);
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return Changed;
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case LibFunc_rewind:
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Changed |= setDoesNotThrow(F);
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Changed |= setDoesNotCapture(F, 0);
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return Changed;
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case LibFunc_rmdir:
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case LibFunc_remove:
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case LibFunc_realpath:
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Changed |= setDoesNotThrow(F);
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Changed |= setDoesNotCapture(F, 0);
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Changed |= setOnlyReadsMemory(F, 0);
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return Changed;
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case LibFunc_rename:
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Changed |= setDoesNotThrow(F);
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Changed |= setDoesNotCapture(F, 0);
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Changed |= setDoesNotCapture(F, 1);
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Changed |= setOnlyReadsMemory(F, 0);
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Changed |= setOnlyReadsMemory(F, 1);
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return Changed;
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case LibFunc_readlink:
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Changed |= setDoesNotThrow(F);
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Changed |= setDoesNotCapture(F, 0);
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Changed |= setDoesNotCapture(F, 1);
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Changed |= setOnlyReadsMemory(F, 0);
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return Changed;
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case LibFunc_write:
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// May throw; "write" is a valid pthread cancellation point.
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Changed |= setDoesNotCapture(F, 1);
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Changed |= setOnlyReadsMemory(F, 1);
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return Changed;
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case LibFunc_bcopy:
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Changed |= setDoesNotThrow(F);
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Changed |= setDoesNotCapture(F, 0);
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Changed |= setDoesNotCapture(F, 1);
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Changed |= setOnlyReadsMemory(F, 0);
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return Changed;
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case LibFunc_bcmp:
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Changed |= setDoesNotThrow(F);
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Changed |= setOnlyReadsMemory(F);
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Changed |= setDoesNotCapture(F, 0);
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Changed |= setDoesNotCapture(F, 1);
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return Changed;
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case LibFunc_bzero:
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Changed |= setDoesNotThrow(F);
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Changed |= setDoesNotCapture(F, 0);
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return Changed;
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case LibFunc_calloc:
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Changed |= setDoesNotThrow(F);
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Changed |= setRetDoesNotAlias(F);
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return Changed;
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case LibFunc_chmod:
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case LibFunc_chown:
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Changed |= setDoesNotThrow(F);
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Changed |= setDoesNotCapture(F, 0);
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Changed |= setOnlyReadsMemory(F, 0);
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return Changed;
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case LibFunc_ctermid:
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case LibFunc_clearerr:
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case LibFunc_closedir:
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Changed |= setDoesNotThrow(F);
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Changed |= setDoesNotCapture(F, 0);
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return Changed;
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case LibFunc_atoi:
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case LibFunc_atol:
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case LibFunc_atof:
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case LibFunc_atoll:
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Changed |= setDoesNotThrow(F);
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Changed |= setOnlyReadsMemory(F);
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Changed |= setDoesNotCapture(F, 0);
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return Changed;
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case LibFunc_access:
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Changed |= setDoesNotThrow(F);
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Changed |= setDoesNotCapture(F, 0);
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Changed |= setOnlyReadsMemory(F, 0);
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return Changed;
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case LibFunc_fopen:
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Changed |= setDoesNotThrow(F);
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Changed |= setRetDoesNotAlias(F);
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Changed |= setDoesNotCapture(F, 0);
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Changed |= setDoesNotCapture(F, 1);
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Changed |= setOnlyReadsMemory(F, 0);
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Changed |= setOnlyReadsMemory(F, 1);
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return Changed;
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case LibFunc_fdopen:
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Changed |= setDoesNotThrow(F);
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Changed |= setRetDoesNotAlias(F);
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Changed |= setDoesNotCapture(F, 1);
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Changed |= setOnlyReadsMemory(F, 1);
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return Changed;
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case LibFunc_feof:
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case LibFunc_free:
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case LibFunc_fseek:
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case LibFunc_ftell:
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case LibFunc_fgetc:
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case LibFunc_fseeko:
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case LibFunc_ftello:
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case LibFunc_fileno:
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case LibFunc_fflush:
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case LibFunc_fclose:
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case LibFunc_fsetpos:
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case LibFunc_flockfile:
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case LibFunc_funlockfile:
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case LibFunc_ftrylockfile:
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Changed |= setDoesNotThrow(F);
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Changed |= setDoesNotCapture(F, 0);
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return Changed;
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case LibFunc_ferror:
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Changed |= setDoesNotThrow(F);
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Changed |= setDoesNotCapture(F, 0);
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Changed |= setOnlyReadsMemory(F);
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return Changed;
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case LibFunc_fputc:
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case LibFunc_fstat:
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case LibFunc_frexp:
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case LibFunc_frexpf:
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case LibFunc_frexpl:
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case LibFunc_fstatvfs:
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Changed |= setDoesNotThrow(F);
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Changed |= setDoesNotCapture(F, 1);
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return Changed;
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case LibFunc_fgets:
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Changed |= setDoesNotThrow(F);
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Changed |= setDoesNotCapture(F, 2);
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return Changed;
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case LibFunc_fread:
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Changed |= setDoesNotThrow(F);
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Changed |= setDoesNotCapture(F, 0);
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Changed |= setDoesNotCapture(F, 3);
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return Changed;
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case LibFunc_fwrite:
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Changed |= setDoesNotThrow(F);
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Changed |= setDoesNotCapture(F, 0);
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Changed |= setDoesNotCapture(F, 3);
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// FIXME: readonly #1?
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return Changed;
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case LibFunc_fputs:
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Changed |= setDoesNotThrow(F);
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Changed |= setDoesNotCapture(F, 0);
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Changed |= setDoesNotCapture(F, 1);
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Changed |= setOnlyReadsMemory(F, 0);
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return Changed;
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case LibFunc_fscanf:
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case LibFunc_fprintf:
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Changed |= setDoesNotThrow(F);
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Changed |= setDoesNotCapture(F, 0);
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Changed |= setDoesNotCapture(F, 1);
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Changed |= setOnlyReadsMemory(F, 1);
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return Changed;
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case LibFunc_fgetpos:
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Changed |= setDoesNotThrow(F);
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Changed |= setDoesNotCapture(F, 0);
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Changed |= setDoesNotCapture(F, 1);
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return Changed;
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case LibFunc_getc:
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case LibFunc_getlogin_r:
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case LibFunc_getc_unlocked:
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Changed |= setDoesNotThrow(F);
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Changed |= setDoesNotCapture(F, 0);
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return Changed;
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case LibFunc_getenv:
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Changed |= setDoesNotThrow(F);
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Changed |= setOnlyReadsMemory(F);
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Changed |= setDoesNotCapture(F, 0);
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return Changed;
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case LibFunc_gets:
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case LibFunc_getchar:
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Changed |= setDoesNotThrow(F);
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return Changed;
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case LibFunc_getitimer:
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Changed |= setDoesNotThrow(F);
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Changed |= setDoesNotCapture(F, 1);
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return Changed;
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case LibFunc_getpwnam:
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Changed |= setDoesNotThrow(F);
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Changed |= setDoesNotCapture(F, 0);
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Changed |= setOnlyReadsMemory(F, 0);
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return Changed;
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case LibFunc_ungetc:
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Changed |= setDoesNotThrow(F);
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Changed |= setDoesNotCapture(F, 1);
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return Changed;
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case LibFunc_uname:
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Changed |= setDoesNotThrow(F);
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Changed |= setDoesNotCapture(F, 0);
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return Changed;
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case LibFunc_unlink:
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Changed |= setDoesNotThrow(F);
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Changed |= setDoesNotCapture(F, 0);
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Changed |= setOnlyReadsMemory(F, 0);
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return Changed;
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case LibFunc_unsetenv:
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Changed |= setDoesNotThrow(F);
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Changed |= setDoesNotCapture(F, 0);
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Changed |= setOnlyReadsMemory(F, 0);
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return Changed;
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case LibFunc_utime:
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case LibFunc_utimes:
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Changed |= setDoesNotThrow(F);
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Changed |= setDoesNotCapture(F, 0);
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Changed |= setDoesNotCapture(F, 1);
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Changed |= setOnlyReadsMemory(F, 0);
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Changed |= setOnlyReadsMemory(F, 1);
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return Changed;
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case LibFunc_putc:
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Changed |= setDoesNotThrow(F);
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Changed |= setDoesNotCapture(F, 1);
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return Changed;
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case LibFunc_puts:
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case LibFunc_printf:
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case LibFunc_perror:
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Changed |= setDoesNotThrow(F);
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Changed |= setDoesNotCapture(F, 0);
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Changed |= setOnlyReadsMemory(F, 0);
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return Changed;
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case LibFunc_pread:
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// May throw; "pread" is a valid pthread cancellation point.
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Changed |= setDoesNotCapture(F, 1);
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return Changed;
|
|
case LibFunc_pwrite:
|
|
// May throw; "pwrite" is a valid pthread cancellation point.
|
|
Changed |= setDoesNotCapture(F, 1);
|
|
Changed |= setOnlyReadsMemory(F, 1);
|
|
return Changed;
|
|
case LibFunc_putchar:
|
|
Changed |= setDoesNotThrow(F);
|
|
return Changed;
|
|
case LibFunc_popen:
|
|
Changed |= setDoesNotThrow(F);
|
|
Changed |= setRetDoesNotAlias(F);
|
|
Changed |= setDoesNotCapture(F, 0);
|
|
Changed |= setDoesNotCapture(F, 1);
|
|
Changed |= setOnlyReadsMemory(F, 0);
|
|
Changed |= setOnlyReadsMemory(F, 1);
|
|
return Changed;
|
|
case LibFunc_pclose:
|
|
Changed |= setDoesNotThrow(F);
|
|
Changed |= setDoesNotCapture(F, 0);
|
|
return Changed;
|
|
case LibFunc_vscanf:
|
|
Changed |= setDoesNotThrow(F);
|
|
Changed |= setDoesNotCapture(F, 0);
|
|
Changed |= setOnlyReadsMemory(F, 0);
|
|
return Changed;
|
|
case LibFunc_vsscanf:
|
|
Changed |= setDoesNotThrow(F);
|
|
Changed |= setDoesNotCapture(F, 0);
|
|
Changed |= setDoesNotCapture(F, 1);
|
|
Changed |= setOnlyReadsMemory(F, 0);
|
|
Changed |= setOnlyReadsMemory(F, 1);
|
|
return Changed;
|
|
case LibFunc_vfscanf:
|
|
Changed |= setDoesNotThrow(F);
|
|
Changed |= setDoesNotCapture(F, 0);
|
|
Changed |= setDoesNotCapture(F, 1);
|
|
Changed |= setOnlyReadsMemory(F, 1);
|
|
return Changed;
|
|
case LibFunc_valloc:
|
|
Changed |= setDoesNotThrow(F);
|
|
Changed |= setRetDoesNotAlias(F);
|
|
return Changed;
|
|
case LibFunc_vprintf:
|
|
Changed |= setDoesNotThrow(F);
|
|
Changed |= setDoesNotCapture(F, 0);
|
|
Changed |= setOnlyReadsMemory(F, 0);
|
|
return Changed;
|
|
case LibFunc_vfprintf:
|
|
case LibFunc_vsprintf:
|
|
Changed |= setDoesNotThrow(F);
|
|
Changed |= setDoesNotCapture(F, 0);
|
|
Changed |= setDoesNotCapture(F, 1);
|
|
Changed |= setOnlyReadsMemory(F, 1);
|
|
return Changed;
|
|
case LibFunc_vsnprintf:
|
|
Changed |= setDoesNotThrow(F);
|
|
Changed |= setDoesNotCapture(F, 0);
|
|
Changed |= setDoesNotCapture(F, 2);
|
|
Changed |= setOnlyReadsMemory(F, 2);
|
|
return Changed;
|
|
case LibFunc_open:
|
|
// May throw; "open" is a valid pthread cancellation point.
|
|
Changed |= setDoesNotCapture(F, 0);
|
|
Changed |= setOnlyReadsMemory(F, 0);
|
|
return Changed;
|
|
case LibFunc_opendir:
|
|
Changed |= setDoesNotThrow(F);
|
|
Changed |= setRetDoesNotAlias(F);
|
|
Changed |= setDoesNotCapture(F, 0);
|
|
Changed |= setOnlyReadsMemory(F, 0);
|
|
return Changed;
|
|
case LibFunc_tmpfile:
|
|
Changed |= setDoesNotThrow(F);
|
|
Changed |= setRetDoesNotAlias(F);
|
|
return Changed;
|
|
case LibFunc_times:
|
|
Changed |= setDoesNotThrow(F);
|
|
Changed |= setDoesNotCapture(F, 0);
|
|
return Changed;
|
|
case LibFunc_htonl:
|
|
case LibFunc_htons:
|
|
case LibFunc_ntohl:
|
|
case LibFunc_ntohs:
|
|
Changed |= setDoesNotThrow(F);
|
|
Changed |= setDoesNotAccessMemory(F);
|
|
return Changed;
|
|
case LibFunc_lstat:
|
|
Changed |= setDoesNotThrow(F);
|
|
Changed |= setDoesNotCapture(F, 0);
|
|
Changed |= setDoesNotCapture(F, 1);
|
|
Changed |= setOnlyReadsMemory(F, 0);
|
|
return Changed;
|
|
case LibFunc_lchown:
|
|
Changed |= setDoesNotThrow(F);
|
|
Changed |= setDoesNotCapture(F, 0);
|
|
Changed |= setOnlyReadsMemory(F, 0);
|
|
return Changed;
|
|
case LibFunc_qsort:
|
|
// May throw; places call through function pointer.
|
|
Changed |= setDoesNotCapture(F, 3);
|
|
return Changed;
|
|
case LibFunc_dunder_strdup:
|
|
case LibFunc_dunder_strndup:
|
|
Changed |= setDoesNotThrow(F);
|
|
Changed |= setRetDoesNotAlias(F);
|
|
Changed |= setDoesNotCapture(F, 0);
|
|
Changed |= setOnlyReadsMemory(F, 0);
|
|
return Changed;
|
|
case LibFunc_dunder_strtok_r:
|
|
Changed |= setDoesNotThrow(F);
|
|
Changed |= setDoesNotCapture(F, 1);
|
|
Changed |= setOnlyReadsMemory(F, 1);
|
|
return Changed;
|
|
case LibFunc_under_IO_getc:
|
|
Changed |= setDoesNotThrow(F);
|
|
Changed |= setDoesNotCapture(F, 0);
|
|
return Changed;
|
|
case LibFunc_under_IO_putc:
|
|
Changed |= setDoesNotThrow(F);
|
|
Changed |= setDoesNotCapture(F, 1);
|
|
return Changed;
|
|
case LibFunc_dunder_isoc99_scanf:
|
|
Changed |= setDoesNotThrow(F);
|
|
Changed |= setDoesNotCapture(F, 0);
|
|
Changed |= setOnlyReadsMemory(F, 0);
|
|
return Changed;
|
|
case LibFunc_stat64:
|
|
case LibFunc_lstat64:
|
|
case LibFunc_statvfs64:
|
|
Changed |= setDoesNotThrow(F);
|
|
Changed |= setDoesNotCapture(F, 0);
|
|
Changed |= setDoesNotCapture(F, 1);
|
|
Changed |= setOnlyReadsMemory(F, 0);
|
|
return Changed;
|
|
case LibFunc_dunder_isoc99_sscanf:
|
|
Changed |= setDoesNotThrow(F);
|
|
Changed |= setDoesNotCapture(F, 0);
|
|
Changed |= setDoesNotCapture(F, 1);
|
|
Changed |= setOnlyReadsMemory(F, 0);
|
|
Changed |= setOnlyReadsMemory(F, 1);
|
|
return Changed;
|
|
case LibFunc_fopen64:
|
|
Changed |= setDoesNotThrow(F);
|
|
Changed |= setRetDoesNotAlias(F);
|
|
Changed |= setDoesNotCapture(F, 0);
|
|
Changed |= setDoesNotCapture(F, 1);
|
|
Changed |= setOnlyReadsMemory(F, 0);
|
|
Changed |= setOnlyReadsMemory(F, 1);
|
|
return Changed;
|
|
case LibFunc_fseeko64:
|
|
case LibFunc_ftello64:
|
|
Changed |= setDoesNotThrow(F);
|
|
Changed |= setDoesNotCapture(F, 0);
|
|
return Changed;
|
|
case LibFunc_tmpfile64:
|
|
Changed |= setDoesNotThrow(F);
|
|
Changed |= setRetDoesNotAlias(F);
|
|
return Changed;
|
|
case LibFunc_fstat64:
|
|
case LibFunc_fstatvfs64:
|
|
Changed |= setDoesNotThrow(F);
|
|
Changed |= setDoesNotCapture(F, 1);
|
|
return Changed;
|
|
case LibFunc_open64:
|
|
// May throw; "open" is a valid pthread cancellation point.
|
|
Changed |= setDoesNotCapture(F, 0);
|
|
Changed |= setOnlyReadsMemory(F, 0);
|
|
return Changed;
|
|
case LibFunc_gettimeofday:
|
|
// Currently some platforms have the restrict keyword on the arguments to
|
|
// gettimeofday. To be conservative, do not add noalias to gettimeofday's
|
|
// arguments.
|
|
Changed |= setDoesNotThrow(F);
|
|
Changed |= setDoesNotCapture(F, 0);
|
|
Changed |= setDoesNotCapture(F, 1);
|
|
return Changed;
|
|
case LibFunc_Znwj: // new(unsigned int)
|
|
case LibFunc_Znwm: // new(unsigned long)
|
|
case LibFunc_Znaj: // new[](unsigned int)
|
|
case LibFunc_Znam: // new[](unsigned long)
|
|
case LibFunc_msvc_new_int: // new(unsigned int)
|
|
case LibFunc_msvc_new_longlong: // new(unsigned long long)
|
|
case LibFunc_msvc_new_array_int: // new[](unsigned int)
|
|
case LibFunc_msvc_new_array_longlong: // new[](unsigned long long)
|
|
// Operator new always returns a nonnull noalias pointer
|
|
Changed |= setRetNonNull(F);
|
|
Changed |= setRetDoesNotAlias(F);
|
|
return Changed;
|
|
//TODO: add LibFunc entries for:
|
|
//case LibFunc_memset_pattern4:
|
|
//case LibFunc_memset_pattern8:
|
|
case LibFunc_memset_pattern16:
|
|
Changed |= setOnlyAccessesArgMemory(F);
|
|
Changed |= setDoesNotCapture(F, 0);
|
|
Changed |= setDoesNotCapture(F, 1);
|
|
Changed |= setOnlyReadsMemory(F, 1);
|
|
return Changed;
|
|
// int __nvvm_reflect(const char *)
|
|
case LibFunc_nvvm_reflect:
|
|
Changed |= setDoesNotAccessMemory(F);
|
|
Changed |= setDoesNotThrow(F);
|
|
return Changed;
|
|
|
|
default:
|
|
// FIXME: It'd be really nice to cover all the library functions we're
|
|
// aware of here.
|
|
return false;
|
|
}
|
|
}
|
|
|
|
//- Emit LibCalls ------------------------------------------------------------//
|
|
|
|
Value *llvm::castToCStr(Value *V, IRBuilder<> &B) {
|
|
unsigned AS = V->getType()->getPointerAddressSpace();
|
|
return B.CreateBitCast(V, B.getInt8PtrTy(AS), "cstr");
|
|
}
|
|
|
|
Value *llvm::emitStrLen(Value *Ptr, IRBuilder<> &B, const DataLayout &DL,
|
|
const TargetLibraryInfo *TLI) {
|
|
if (!TLI->has(LibFunc_strlen))
|
|
return nullptr;
|
|
|
|
Module *M = B.GetInsertBlock()->getModule();
|
|
LLVMContext &Context = B.GetInsertBlock()->getContext();
|
|
Constant *StrLen = M->getOrInsertFunction("strlen", DL.getIntPtrType(Context),
|
|
B.getInt8PtrTy());
|
|
inferLibFuncAttributes(*M->getFunction("strlen"), *TLI);
|
|
CallInst *CI = B.CreateCall(StrLen, castToCStr(Ptr, B), "strlen");
|
|
if (const Function *F = dyn_cast<Function>(StrLen->stripPointerCasts()))
|
|
CI->setCallingConv(F->getCallingConv());
|
|
|
|
return CI;
|
|
}
|
|
|
|
Value *llvm::emitStrChr(Value *Ptr, char C, IRBuilder<> &B,
|
|
const TargetLibraryInfo *TLI) {
|
|
if (!TLI->has(LibFunc_strchr))
|
|
return nullptr;
|
|
|
|
Module *M = B.GetInsertBlock()->getModule();
|
|
Type *I8Ptr = B.getInt8PtrTy();
|
|
Type *I32Ty = B.getInt32Ty();
|
|
Constant *StrChr =
|
|
M->getOrInsertFunction("strchr", I8Ptr, I8Ptr, I32Ty);
|
|
inferLibFuncAttributes(*M->getFunction("strchr"), *TLI);
|
|
CallInst *CI = B.CreateCall(
|
|
StrChr, {castToCStr(Ptr, B), ConstantInt::get(I32Ty, C)}, "strchr");
|
|
if (const Function *F = dyn_cast<Function>(StrChr->stripPointerCasts()))
|
|
CI->setCallingConv(F->getCallingConv());
|
|
return CI;
|
|
}
|
|
|
|
Value *llvm::emitStrNCmp(Value *Ptr1, Value *Ptr2, Value *Len, IRBuilder<> &B,
|
|
const DataLayout &DL, const TargetLibraryInfo *TLI) {
|
|
if (!TLI->has(LibFunc_strncmp))
|
|
return nullptr;
|
|
|
|
Module *M = B.GetInsertBlock()->getModule();
|
|
LLVMContext &Context = B.GetInsertBlock()->getContext();
|
|
Value *StrNCmp = M->getOrInsertFunction("strncmp", B.getInt32Ty(),
|
|
B.getInt8PtrTy(), B.getInt8PtrTy(),
|
|
DL.getIntPtrType(Context));
|
|
inferLibFuncAttributes(*M->getFunction("strncmp"), *TLI);
|
|
CallInst *CI = B.CreateCall(
|
|
StrNCmp, {castToCStr(Ptr1, B), castToCStr(Ptr2, B), Len}, "strncmp");
|
|
|
|
if (const Function *F = dyn_cast<Function>(StrNCmp->stripPointerCasts()))
|
|
CI->setCallingConv(F->getCallingConv());
|
|
|
|
return CI;
|
|
}
|
|
|
|
Value *llvm::emitStrCpy(Value *Dst, Value *Src, IRBuilder<> &B,
|
|
const TargetLibraryInfo *TLI, StringRef Name) {
|
|
if (!TLI->has(LibFunc_strcpy))
|
|
return nullptr;
|
|
|
|
Module *M = B.GetInsertBlock()->getModule();
|
|
Type *I8Ptr = B.getInt8PtrTy();
|
|
Value *StrCpy = M->getOrInsertFunction(Name, I8Ptr, I8Ptr, I8Ptr);
|
|
inferLibFuncAttributes(*M->getFunction(Name), *TLI);
|
|
CallInst *CI =
|
|
B.CreateCall(StrCpy, {castToCStr(Dst, B), castToCStr(Src, B)}, Name);
|
|
if (const Function *F = dyn_cast<Function>(StrCpy->stripPointerCasts()))
|
|
CI->setCallingConv(F->getCallingConv());
|
|
return CI;
|
|
}
|
|
|
|
Value *llvm::emitStrNCpy(Value *Dst, Value *Src, Value *Len, IRBuilder<> &B,
|
|
const TargetLibraryInfo *TLI, StringRef Name) {
|
|
if (!TLI->has(LibFunc_strncpy))
|
|
return nullptr;
|
|
|
|
Module *M = B.GetInsertBlock()->getModule();
|
|
Type *I8Ptr = B.getInt8PtrTy();
|
|
Value *StrNCpy = M->getOrInsertFunction(Name, I8Ptr, I8Ptr, I8Ptr,
|
|
Len->getType());
|
|
inferLibFuncAttributes(*M->getFunction(Name), *TLI);
|
|
CallInst *CI = B.CreateCall(
|
|
StrNCpy, {castToCStr(Dst, B), castToCStr(Src, B), Len}, "strncpy");
|
|
if (const Function *F = dyn_cast<Function>(StrNCpy->stripPointerCasts()))
|
|
CI->setCallingConv(F->getCallingConv());
|
|
return CI;
|
|
}
|
|
|
|
Value *llvm::emitMemCpyChk(Value *Dst, Value *Src, Value *Len, Value *ObjSize,
|
|
IRBuilder<> &B, const DataLayout &DL,
|
|
const TargetLibraryInfo *TLI) {
|
|
if (!TLI->has(LibFunc_memcpy_chk))
|
|
return nullptr;
|
|
|
|
Module *M = B.GetInsertBlock()->getModule();
|
|
AttributeList AS;
|
|
AS = AttributeList::get(M->getContext(), AttributeList::FunctionIndex,
|
|
Attribute::NoUnwind);
|
|
LLVMContext &Context = B.GetInsertBlock()->getContext();
|
|
Value *MemCpy = M->getOrInsertFunction(
|
|
"__memcpy_chk", AttributeList::get(M->getContext(), AS), B.getInt8PtrTy(),
|
|
B.getInt8PtrTy(), B.getInt8PtrTy(), DL.getIntPtrType(Context),
|
|
DL.getIntPtrType(Context));
|
|
Dst = castToCStr(Dst, B);
|
|
Src = castToCStr(Src, B);
|
|
CallInst *CI = B.CreateCall(MemCpy, {Dst, Src, Len, ObjSize});
|
|
if (const Function *F = dyn_cast<Function>(MemCpy->stripPointerCasts()))
|
|
CI->setCallingConv(F->getCallingConv());
|
|
return CI;
|
|
}
|
|
|
|
Value *llvm::emitMemChr(Value *Ptr, Value *Val, Value *Len, IRBuilder<> &B,
|
|
const DataLayout &DL, const TargetLibraryInfo *TLI) {
|
|
if (!TLI->has(LibFunc_memchr))
|
|
return nullptr;
|
|
|
|
Module *M = B.GetInsertBlock()->getModule();
|
|
LLVMContext &Context = B.GetInsertBlock()->getContext();
|
|
Value *MemChr = M->getOrInsertFunction("memchr", B.getInt8PtrTy(),
|
|
B.getInt8PtrTy(), B.getInt32Ty(),
|
|
DL.getIntPtrType(Context));
|
|
inferLibFuncAttributes(*M->getFunction("memchr"), *TLI);
|
|
CallInst *CI = B.CreateCall(MemChr, {castToCStr(Ptr, B), Val, Len}, "memchr");
|
|
|
|
if (const Function *F = dyn_cast<Function>(MemChr->stripPointerCasts()))
|
|
CI->setCallingConv(F->getCallingConv());
|
|
|
|
return CI;
|
|
}
|
|
|
|
Value *llvm::emitMemCmp(Value *Ptr1, Value *Ptr2, Value *Len, IRBuilder<> &B,
|
|
const DataLayout &DL, const TargetLibraryInfo *TLI) {
|
|
if (!TLI->has(LibFunc_memcmp))
|
|
return nullptr;
|
|
|
|
Module *M = B.GetInsertBlock()->getModule();
|
|
LLVMContext &Context = B.GetInsertBlock()->getContext();
|
|
Value *MemCmp = M->getOrInsertFunction("memcmp", B.getInt32Ty(),
|
|
B.getInt8PtrTy(), B.getInt8PtrTy(),
|
|
DL.getIntPtrType(Context));
|
|
inferLibFuncAttributes(*M->getFunction("memcmp"), *TLI);
|
|
CallInst *CI = B.CreateCall(
|
|
MemCmp, {castToCStr(Ptr1, B), castToCStr(Ptr2, B), Len}, "memcmp");
|
|
|
|
if (const Function *F = dyn_cast<Function>(MemCmp->stripPointerCasts()))
|
|
CI->setCallingConv(F->getCallingConv());
|
|
|
|
return CI;
|
|
}
|
|
|
|
/// Append a suffix to the function name according to the type of 'Op'.
|
|
static void appendTypeSuffix(Value *Op, StringRef &Name,
|
|
SmallString<20> &NameBuffer) {
|
|
if (!Op->getType()->isDoubleTy()) {
|
|
NameBuffer += Name;
|
|
|
|
if (Op->getType()->isFloatTy())
|
|
NameBuffer += 'f';
|
|
else
|
|
NameBuffer += 'l';
|
|
|
|
Name = NameBuffer;
|
|
}
|
|
}
|
|
|
|
Value *llvm::emitUnaryFloatFnCall(Value *Op, StringRef Name, IRBuilder<> &B,
|
|
const AttributeList &Attrs) {
|
|
SmallString<20> NameBuffer;
|
|
appendTypeSuffix(Op, Name, NameBuffer);
|
|
|
|
Module *M = B.GetInsertBlock()->getModule();
|
|
Value *Callee = M->getOrInsertFunction(Name, Op->getType(),
|
|
Op->getType());
|
|
CallInst *CI = B.CreateCall(Callee, Op, Name);
|
|
|
|
// The incoming attribute set may have come from a speculatable intrinsic, but
|
|
// is being replaced with a library call which is not allowed to be
|
|
// speculatable.
|
|
CI->setAttributes(Attrs.removeAttribute(B.getContext(),
|
|
AttributeList::FunctionIndex,
|
|
Attribute::Speculatable));
|
|
if (const Function *F = dyn_cast<Function>(Callee->stripPointerCasts()))
|
|
CI->setCallingConv(F->getCallingConv());
|
|
|
|
return CI;
|
|
}
|
|
|
|
Value *llvm::emitBinaryFloatFnCall(Value *Op1, Value *Op2, StringRef Name,
|
|
IRBuilder<> &B, const AttributeList &Attrs) {
|
|
SmallString<20> NameBuffer;
|
|
appendTypeSuffix(Op1, Name, NameBuffer);
|
|
|
|
Module *M = B.GetInsertBlock()->getModule();
|
|
Value *Callee = M->getOrInsertFunction(Name, Op1->getType(), Op1->getType(),
|
|
Op2->getType());
|
|
CallInst *CI = B.CreateCall(Callee, {Op1, Op2}, Name);
|
|
CI->setAttributes(Attrs);
|
|
if (const Function *F = dyn_cast<Function>(Callee->stripPointerCasts()))
|
|
CI->setCallingConv(F->getCallingConv());
|
|
|
|
return CI;
|
|
}
|
|
|
|
Value *llvm::emitPutChar(Value *Char, IRBuilder<> &B,
|
|
const TargetLibraryInfo *TLI) {
|
|
if (!TLI->has(LibFunc_putchar))
|
|
return nullptr;
|
|
|
|
Module *M = B.GetInsertBlock()->getModule();
|
|
Value *PutChar = M->getOrInsertFunction("putchar", B.getInt32Ty(), B.getInt32Ty());
|
|
inferLibFuncAttributes(*M->getFunction("putchar"), *TLI);
|
|
CallInst *CI = B.CreateCall(PutChar,
|
|
B.CreateIntCast(Char,
|
|
B.getInt32Ty(),
|
|
/*isSigned*/true,
|
|
"chari"),
|
|
"putchar");
|
|
|
|
if (const Function *F = dyn_cast<Function>(PutChar->stripPointerCasts()))
|
|
CI->setCallingConv(F->getCallingConv());
|
|
return CI;
|
|
}
|
|
|
|
Value *llvm::emitPutS(Value *Str, IRBuilder<> &B,
|
|
const TargetLibraryInfo *TLI) {
|
|
if (!TLI->has(LibFunc_puts))
|
|
return nullptr;
|
|
|
|
Module *M = B.GetInsertBlock()->getModule();
|
|
Value *PutS =
|
|
M->getOrInsertFunction("puts", B.getInt32Ty(), B.getInt8PtrTy());
|
|
inferLibFuncAttributes(*M->getFunction("puts"), *TLI);
|
|
CallInst *CI = B.CreateCall(PutS, castToCStr(Str, B), "puts");
|
|
if (const Function *F = dyn_cast<Function>(PutS->stripPointerCasts()))
|
|
CI->setCallingConv(F->getCallingConv());
|
|
return CI;
|
|
}
|
|
|
|
Value *llvm::emitFPutC(Value *Char, Value *File, IRBuilder<> &B,
|
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const TargetLibraryInfo *TLI) {
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if (!TLI->has(LibFunc_fputc))
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return nullptr;
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|
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Module *M = B.GetInsertBlock()->getModule();
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Constant *F = M->getOrInsertFunction("fputc", B.getInt32Ty(), B.getInt32Ty(),
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File->getType());
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if (File->getType()->isPointerTy())
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inferLibFuncAttributes(*M->getFunction("fputc"), *TLI);
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Char = B.CreateIntCast(Char, B.getInt32Ty(), /*isSigned*/true,
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"chari");
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CallInst *CI = B.CreateCall(F, {Char, File}, "fputc");
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|
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if (const Function *Fn = dyn_cast<Function>(F->stripPointerCasts()))
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CI->setCallingConv(Fn->getCallingConv());
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return CI;
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}
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Value *llvm::emitFPutS(Value *Str, Value *File, IRBuilder<> &B,
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const TargetLibraryInfo *TLI) {
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if (!TLI->has(LibFunc_fputs))
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return nullptr;
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|
|
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Module *M = B.GetInsertBlock()->getModule();
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|
StringRef FPutsName = TLI->getName(LibFunc_fputs);
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|
Constant *F = M->getOrInsertFunction(
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|
FPutsName, B.getInt32Ty(), B.getInt8PtrTy(), File->getType());
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|
if (File->getType()->isPointerTy())
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|
inferLibFuncAttributes(*M->getFunction(FPutsName), *TLI);
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|
CallInst *CI = B.CreateCall(F, {castToCStr(Str, B), File}, "fputs");
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|
|
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if (const Function *Fn = dyn_cast<Function>(F->stripPointerCasts()))
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|
CI->setCallingConv(Fn->getCallingConv());
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|
return CI;
|
|
}
|
|
|
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Value *llvm::emitFWrite(Value *Ptr, Value *Size, Value *File, IRBuilder<> &B,
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const DataLayout &DL, const TargetLibraryInfo *TLI) {
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|
if (!TLI->has(LibFunc_fwrite))
|
|
return nullptr;
|
|
|
|
Module *M = B.GetInsertBlock()->getModule();
|
|
LLVMContext &Context = B.GetInsertBlock()->getContext();
|
|
StringRef FWriteName = TLI->getName(LibFunc_fwrite);
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|
Constant *F = M->getOrInsertFunction(
|
|
FWriteName, DL.getIntPtrType(Context), B.getInt8PtrTy(),
|
|
DL.getIntPtrType(Context), DL.getIntPtrType(Context), File->getType());
|
|
|
|
if (File->getType()->isPointerTy())
|
|
inferLibFuncAttributes(*M->getFunction(FWriteName), *TLI);
|
|
CallInst *CI =
|
|
B.CreateCall(F, {castToCStr(Ptr, B), Size,
|
|
ConstantInt::get(DL.getIntPtrType(Context), 1), File});
|
|
|
|
if (const Function *Fn = dyn_cast<Function>(F->stripPointerCasts()))
|
|
CI->setCallingConv(Fn->getCallingConv());
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|
return CI;
|
|
}
|