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llvm/utils/TableGen/IntrinsicEmitter.cpp
Duncan Sands 7c422ac216 Partially address a README by having functionattrs consider calls to 
memcpy, memset and other intrinsics that only access their arguments
to be readnone if the intrinsic's arguments all point to local memory.
This improves the testcase in the README to readonly, but it could in
theory be made readnone, however this would involve more sophisticated
analysis that looks through the memcpy.


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@92829 91177308-0d34-0410-b5e6-96231b3b80d8
2010-01-06 08:45:52 +00:00

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//===- IntrinsicEmitter.cpp - Generate intrinsic information --------------===//
//
// The LLVM Compiler Infrastructure
//
// This file is distributed under the University of Illinois Open Source
// License. See LICENSE.TXT for details.
//
//===----------------------------------------------------------------------===//
//
// This tablegen backend emits information about intrinsic functions.
//
//===----------------------------------------------------------------------===//
#include "CodeGenTarget.h"
#include "IntrinsicEmitter.h"
#include "Record.h"
#include "llvm/ADT/StringExtras.h"
#include <algorithm>
using namespace llvm;
//===----------------------------------------------------------------------===//
// IntrinsicEmitter Implementation
//===----------------------------------------------------------------------===//
void IntrinsicEmitter::run(raw_ostream &OS) {
EmitSourceFileHeader("Intrinsic Function Source Fragment", OS);
std::vector<CodeGenIntrinsic> Ints = LoadIntrinsics(Records, TargetOnly);
if (TargetOnly && !Ints.empty())
TargetPrefix = Ints[0].TargetPrefix;
// Emit the enum information.
EmitEnumInfo(Ints, OS);
// Emit the intrinsic ID -> name table.
EmitIntrinsicToNameTable(Ints, OS);
// Emit the intrinsic ID -> overload table.
EmitIntrinsicToOverloadTable(Ints, OS);
// Emit the function name recognizer.
EmitFnNameRecognizer(Ints, OS);
// Emit the intrinsic verifier.
EmitVerifier(Ints, OS);
// Emit the intrinsic declaration generator.
EmitGenerator(Ints, OS);
// Emit the intrinsic parameter attributes.
EmitAttributes(Ints, OS);
// Emit intrinsic alias analysis mod/ref behavior.
EmitModRefBehavior(Ints, OS);
// Emit a list of intrinsics with corresponding GCC builtins.
EmitGCCBuiltinList(Ints, OS);
// Emit code to translate GCC builtins into LLVM intrinsics.
EmitIntrinsicToGCCBuiltinMap(Ints, OS);
}
void IntrinsicEmitter::EmitEnumInfo(const std::vector<CodeGenIntrinsic> &Ints,
raw_ostream &OS) {
OS << "// Enum values for Intrinsics.h\n";
OS << "#ifdef GET_INTRINSIC_ENUM_VALUES\n";
for (unsigned i = 0, e = Ints.size(); i != e; ++i) {
OS << " " << Ints[i].EnumName;
OS << ((i != e-1) ? ", " : " ");
OS << std::string(40-Ints[i].EnumName.size(), ' ')
<< "// " << Ints[i].Name << "\n";
}
OS << "#endif\n\n";
}
void IntrinsicEmitter::
EmitFnNameRecognizer(const std::vector<CodeGenIntrinsic> &Ints,
raw_ostream &OS) {
// Build a function name -> intrinsic name mapping.
std::map<std::string, unsigned> IntMapping;
for (unsigned i = 0, e = Ints.size(); i != e; ++i)
IntMapping[Ints[i].Name] = i;
OS << "// Function name -> enum value recognizer code.\n";
OS << "#ifdef GET_FUNCTION_RECOGNIZER\n";
OS << " switch (Name[5]) {\n";
OS << " default:\n";
// Emit the intrinsics in sorted order.
char LastChar = 0;
for (std::map<std::string, unsigned>::iterator I = IntMapping.begin(),
E = IntMapping.end(); I != E; ++I) {
if (I->first[5] != LastChar) {
LastChar = I->first[5];
OS << " break;\n";
OS << " case '" << LastChar << "':\n";
}
// For overloaded intrinsics, only the prefix needs to match
if (Ints[I->second].isOverloaded)
OS << " if (Len > " << I->first.size()
<< " && !memcmp(Name, \"" << I->first << ".\", "
<< (I->first.size() + 1) << ")) return " << TargetPrefix << "Intrinsic::"
<< Ints[I->second].EnumName << ";\n";
else
OS << " if (Len == " << I->first.size()
<< " && !memcmp(Name, \"" << I->first << "\", "
<< I->first.size() << ")) return " << TargetPrefix << "Intrinsic::"
<< Ints[I->second].EnumName << ";\n";
}
OS << " }\n";
OS << "#endif\n\n";
}
void IntrinsicEmitter::
EmitIntrinsicToNameTable(const std::vector<CodeGenIntrinsic> &Ints,
raw_ostream &OS) {
OS << "// Intrinsic ID to name table\n";
OS << "#ifdef GET_INTRINSIC_NAME_TABLE\n";
OS << " // Note that entry #0 is the invalid intrinsic!\n";
for (unsigned i = 0, e = Ints.size(); i != e; ++i)
OS << " \"" << Ints[i].Name << "\",\n";
OS << "#endif\n\n";
}
void IntrinsicEmitter::
EmitIntrinsicToOverloadTable(const std::vector<CodeGenIntrinsic> &Ints,
raw_ostream &OS) {
OS << "// Intrinsic ID to overload table\n";
OS << "#ifdef GET_INTRINSIC_OVERLOAD_TABLE\n";
OS << " // Note that entry #0 is the invalid intrinsic!\n";
for (unsigned i = 0, e = Ints.size(); i != e; ++i) {
OS << " ";
if (Ints[i].isOverloaded)
OS << "true";
else
OS << "false";
OS << ",\n";
}
OS << "#endif\n\n";
}
static void EmitTypeForValueType(raw_ostream &OS, MVT::SimpleValueType VT) {
if (EVT(VT).isInteger()) {
unsigned BitWidth = EVT(VT).getSizeInBits();
OS << "IntegerType::get(Context, " << BitWidth << ")";
} else if (VT == MVT::Other) {
// MVT::OtherVT is used to mean the empty struct type here.
OS << "StructType::get(Context)";
} else if (VT == MVT::f32) {
OS << "Type::getFloatTy(Context)";
} else if (VT == MVT::f64) {
OS << "Type::getDoubleTy(Context)";
} else if (VT == MVT::f80) {
OS << "Type::getX86_FP80Ty(Context)";
} else if (VT == MVT::f128) {
OS << "Type::getFP128Ty(Context)";
} else if (VT == MVT::ppcf128) {
OS << "Type::getPPC_FP128Ty(Context)";
} else if (VT == MVT::isVoid) {
OS << "Type::getVoidTy(Context)";
} else if (VT == MVT::Metadata) {
OS << "Type::getMetadataTy(Context)";
} else {
assert(false && "Unsupported ValueType!");
}
}
static void EmitTypeGenerate(raw_ostream &OS, const Record *ArgType,
unsigned &ArgNo);
static void EmitTypeGenerate(raw_ostream &OS,
const std::vector<Record*> &ArgTypes,
unsigned &ArgNo) {
if (ArgTypes.size() == 1) {
EmitTypeGenerate(OS, ArgTypes.front(), ArgNo);
return;
}
OS << "StructType::get(Context, ";
for (std::vector<Record*>::const_iterator
I = ArgTypes.begin(), E = ArgTypes.end(); I != E; ++I) {
EmitTypeGenerate(OS, *I, ArgNo);
OS << ", ";
}
OS << " NULL)";
}
static void EmitTypeGenerate(raw_ostream &OS, const Record *ArgType,
unsigned &ArgNo) {
MVT::SimpleValueType VT = getValueType(ArgType->getValueAsDef("VT"));
if (ArgType->isSubClassOf("LLVMMatchType")) {
unsigned Number = ArgType->getValueAsInt("Number");
assert(Number < ArgNo && "Invalid matching number!");
if (ArgType->isSubClassOf("LLVMExtendedElementVectorType"))
OS << "VectorType::getExtendedElementVectorType"
<< "(dyn_cast<VectorType>(Tys[" << Number << "]))";
else if (ArgType->isSubClassOf("LLVMTruncatedElementVectorType"))
OS << "VectorType::getTruncatedElementVectorType"
<< "(dyn_cast<VectorType>(Tys[" << Number << "]))";
else
OS << "Tys[" << Number << "]";
} else if (VT == MVT::iAny || VT == MVT::fAny || VT == MVT::vAny) {
// NOTE: The ArgNo variable here is not the absolute argument number, it is
// the index of the "arbitrary" type in the Tys array passed to the
// Intrinsic::getDeclaration function. Consequently, we only want to
// increment it when we actually hit an overloaded type. Getting this wrong
// leads to very subtle bugs!
OS << "Tys[" << ArgNo++ << "]";
} else if (EVT(VT).isVector()) {
EVT VVT = VT;
OS << "VectorType::get(";
EmitTypeForValueType(OS, VVT.getVectorElementType().getSimpleVT().SimpleTy);
OS << ", " << VVT.getVectorNumElements() << ")";
} else if (VT == MVT::iPTR) {
OS << "PointerType::getUnqual(";
EmitTypeGenerate(OS, ArgType->getValueAsDef("ElTy"), ArgNo);
OS << ")";
} else if (VT == MVT::iPTRAny) {
// Make sure the user has passed us an argument type to overload. If not,
// treat it as an ordinary (not overloaded) intrinsic.
OS << "(" << ArgNo << " < numTys) ? Tys[" << ArgNo
<< "] : PointerType::getUnqual(";
EmitTypeGenerate(OS, ArgType->getValueAsDef("ElTy"), ArgNo);
OS << ")";
++ArgNo;
} else if (VT == MVT::isVoid) {
if (ArgNo == 0)
OS << "Type::getVoidTy(Context)";
else
// MVT::isVoid is used to mean varargs here.
OS << "...";
} else {
EmitTypeForValueType(OS, VT);
}
}
/// RecordListComparator - Provide a deterministic comparator for lists of
/// records.
namespace {
typedef std::pair<std::vector<Record*>, std::vector<Record*> > RecPair;
struct RecordListComparator {
bool operator()(const RecPair &LHS,
const RecPair &RHS) const {
unsigned i = 0;
const std::vector<Record*> *LHSVec = &LHS.first;
const std::vector<Record*> *RHSVec = &RHS.first;
unsigned RHSSize = RHSVec->size();
unsigned LHSSize = LHSVec->size();
do {
if (i == RHSSize) return false; // RHS is shorter than LHS.
if ((*LHSVec)[i] != (*RHSVec)[i])
return (*LHSVec)[i]->getName() < (*RHSVec)[i]->getName();
} while (++i != LHSSize);
if (i != RHSSize) return true;
i = 0;
LHSVec = &LHS.second;
RHSVec = &RHS.second;
RHSSize = RHSVec->size();
LHSSize = LHSVec->size();
for (i = 0; i != LHSSize; ++i) {
if (i == RHSSize) return false; // RHS is shorter than LHS.
if ((*LHSVec)[i] != (*RHSVec)[i])
return (*LHSVec)[i]->getName() < (*RHSVec)[i]->getName();
}
return i != RHSSize;
}
};
}
void IntrinsicEmitter::EmitVerifier(const std::vector<CodeGenIntrinsic> &Ints,
raw_ostream &OS) {
OS << "// Verifier::visitIntrinsicFunctionCall code.\n";
OS << "#ifdef GET_INTRINSIC_VERIFIER\n";
OS << " switch (ID) {\n";
OS << " default: assert(0 && \"Invalid intrinsic!\");\n";
// This checking can emit a lot of very common code. To reduce the amount of
// code that we emit, batch up cases that have identical types. This avoids
// problems where GCC can run out of memory compiling Verifier.cpp.
typedef std::map<RecPair, std::vector<unsigned>, RecordListComparator> MapTy;
MapTy UniqueArgInfos;
// Compute the unique argument type info.
for (unsigned i = 0, e = Ints.size(); i != e; ++i)
UniqueArgInfos[make_pair(Ints[i].IS.RetTypeDefs,
Ints[i].IS.ParamTypeDefs)].push_back(i);
// Loop through the array, emitting one comparison for each batch.
for (MapTy::iterator I = UniqueArgInfos.begin(),
E = UniqueArgInfos.end(); I != E; ++I) {
for (unsigned i = 0, e = I->second.size(); i != e; ++i)
OS << " case Intrinsic::" << Ints[I->second[i]].EnumName << ":\t\t// "
<< Ints[I->second[i]].Name << "\n";
const RecPair &ArgTypes = I->first;
const std::vector<Record*> &RetTys = ArgTypes.first;
const std::vector<Record*> &ParamTys = ArgTypes.second;
std::vector<unsigned> OverloadedTypeIndices;
OS << " VerifyIntrinsicPrototype(ID, IF, " << RetTys.size() << ", "
<< ParamTys.size();
// Emit return types.
for (unsigned j = 0, je = RetTys.size(); j != je; ++j) {
Record *ArgType = RetTys[j];
OS << ", ";
if (ArgType->isSubClassOf("LLVMMatchType")) {
unsigned Number = ArgType->getValueAsInt("Number");
assert(Number < OverloadedTypeIndices.size() &&
"Invalid matching number!");
Number = OverloadedTypeIndices[Number];
if (ArgType->isSubClassOf("LLVMExtendedElementVectorType"))
OS << "~(ExtendedElementVectorType | " << Number << ")";
else if (ArgType->isSubClassOf("LLVMTruncatedElementVectorType"))
OS << "~(TruncatedElementVectorType | " << Number << ")";
else
OS << "~" << Number;
} else {
MVT::SimpleValueType VT = getValueType(ArgType->getValueAsDef("VT"));
OS << getEnumName(VT);
if (EVT(VT).isOverloaded())
OverloadedTypeIndices.push_back(j);
if (VT == MVT::isVoid && j != 0 && j != je - 1)
throw "Var arg type not last argument";
}
}
// Emit the parameter types.
for (unsigned j = 0, je = ParamTys.size(); j != je; ++j) {
Record *ArgType = ParamTys[j];
OS << ", ";
if (ArgType->isSubClassOf("LLVMMatchType")) {
unsigned Number = ArgType->getValueAsInt("Number");
assert(Number < OverloadedTypeIndices.size() &&
"Invalid matching number!");
Number = OverloadedTypeIndices[Number];
if (ArgType->isSubClassOf("LLVMExtendedElementVectorType"))
OS << "~(ExtendedElementVectorType | " << Number << ")";
else if (ArgType->isSubClassOf("LLVMTruncatedElementVectorType"))
OS << "~(TruncatedElementVectorType | " << Number << ")";
else
OS << "~" << Number;
} else {
MVT::SimpleValueType VT = getValueType(ArgType->getValueAsDef("VT"));
OS << getEnumName(VT);
if (EVT(VT).isOverloaded())
OverloadedTypeIndices.push_back(j + RetTys.size());
if (VT == MVT::isVoid && j != 0 && j != je - 1)
throw "Var arg type not last argument";
}
}
OS << ");\n";
OS << " break;\n";
}
OS << " }\n";
OS << "#endif\n\n";
}
void IntrinsicEmitter::EmitGenerator(const std::vector<CodeGenIntrinsic> &Ints,
raw_ostream &OS) {
OS << "// Code for generating Intrinsic function declarations.\n";
OS << "#ifdef GET_INTRINSIC_GENERATOR\n";
OS << " switch (id) {\n";
OS << " default: assert(0 && \"Invalid intrinsic!\");\n";
// Similar to GET_INTRINSIC_VERIFIER, batch up cases that have identical
// types.
typedef std::map<RecPair, std::vector<unsigned>, RecordListComparator> MapTy;
MapTy UniqueArgInfos;
// Compute the unique argument type info.
for (unsigned i = 0, e = Ints.size(); i != e; ++i)
UniqueArgInfos[make_pair(Ints[i].IS.RetTypeDefs,
Ints[i].IS.ParamTypeDefs)].push_back(i);
// Loop through the array, emitting one generator for each batch.
std::string IntrinsicStr = TargetPrefix + "Intrinsic::";
for (MapTy::iterator I = UniqueArgInfos.begin(),
E = UniqueArgInfos.end(); I != E; ++I) {
for (unsigned i = 0, e = I->second.size(); i != e; ++i)
OS << " case " << IntrinsicStr << Ints[I->second[i]].EnumName
<< ":\t\t// " << Ints[I->second[i]].Name << "\n";
const RecPair &ArgTypes = I->first;
const std::vector<Record*> &RetTys = ArgTypes.first;
const std::vector<Record*> &ParamTys = ArgTypes.second;
unsigned N = ParamTys.size();
if (N > 1 &&
getValueType(ParamTys[N - 1]->getValueAsDef("VT")) == MVT::isVoid) {
OS << " IsVarArg = true;\n";
--N;
}
unsigned ArgNo = 0;
OS << " ResultTy = ";
EmitTypeGenerate(OS, RetTys, ArgNo);
OS << ";\n";
for (unsigned j = 0; j != N; ++j) {
OS << " ArgTys.push_back(";
EmitTypeGenerate(OS, ParamTys[j], ArgNo);
OS << ");\n";
}
OS << " break;\n";
}
OS << " }\n";
OS << "#endif\n\n";
}
/// EmitAttributes - This emits the Intrinsic::getAttributes method.
void IntrinsicEmitter::
EmitAttributes(const std::vector<CodeGenIntrinsic> &Ints, raw_ostream &OS) {
OS << "// Add parameter attributes that are not common to all intrinsics.\n";
OS << "#ifdef GET_INTRINSIC_ATTRIBUTES\n";
if (TargetOnly)
OS << "static AttrListPtr getAttributes(" << TargetPrefix
<< "Intrinsic::ID id) {";
else
OS << "AttrListPtr Intrinsic::getAttributes(ID id) {";
OS << " // No intrinsic can throw exceptions.\n";
OS << " Attributes Attr = Attribute::NoUnwind;\n";
OS << " switch (id) {\n";
OS << " default: break;\n";
unsigned MaxArgAttrs = 0;
for (unsigned i = 0, e = Ints.size(); i != e; ++i) {
MaxArgAttrs =
std::max(MaxArgAttrs, unsigned(Ints[i].ArgumentAttributes.size()));
switch (Ints[i].ModRef) {
default: break;
case CodeGenIntrinsic::NoMem:
OS << " case " << TargetPrefix << "Intrinsic::" << Ints[i].EnumName
<< ":\n";
break;
}
}
OS << " Attr |= Attribute::ReadNone; // These do not access memory.\n";
OS << " break;\n";
for (unsigned i = 0, e = Ints.size(); i != e; ++i) {
switch (Ints[i].ModRef) {
default: break;
case CodeGenIntrinsic::ReadArgMem:
case CodeGenIntrinsic::ReadMem:
OS << " case " << TargetPrefix << "Intrinsic::" << Ints[i].EnumName
<< ":\n";
break;
}
}
OS << " Attr |= Attribute::ReadOnly; // These do not write memory.\n";
OS << " break;\n";
OS << " }\n";
OS << " AttributeWithIndex AWI[" << MaxArgAttrs+1 << "];\n";
OS << " unsigned NumAttrs = 0;\n";
OS << " switch (id) {\n";
OS << " default: break;\n";
// Add argument attributes for any intrinsics that have them.
for (unsigned i = 0, e = Ints.size(); i != e; ++i) {
if (Ints[i].ArgumentAttributes.empty()) continue;
OS << " case " << TargetPrefix << "Intrinsic::" << Ints[i].EnumName
<< ":\n";
std::vector<std::pair<unsigned, CodeGenIntrinsic::ArgAttribute> > ArgAttrs =
Ints[i].ArgumentAttributes;
// Sort by argument index.
std::sort(ArgAttrs.begin(), ArgAttrs.end());
unsigned NumArgsWithAttrs = 0;
while (!ArgAttrs.empty()) {
unsigned ArgNo = ArgAttrs[0].first;
OS << " AWI[" << NumArgsWithAttrs++ << "] = AttributeWithIndex::get("
<< ArgNo+1 << ", 0";
while (!ArgAttrs.empty() && ArgAttrs[0].first == ArgNo) {
switch (ArgAttrs[0].second) {
default: assert(0 && "Unknown arg attribute");
case CodeGenIntrinsic::NoCapture:
OS << "|Attribute::NoCapture";
break;
}
ArgAttrs.erase(ArgAttrs.begin());
}
OS << ");\n";
}
OS << " NumAttrs = " << NumArgsWithAttrs << ";\n";
OS << " break;\n";
}
OS << " }\n";
OS << " AWI[NumAttrs] = AttributeWithIndex::get(~0, Attr);\n";
OS << " return AttrListPtr::get(AWI, NumAttrs+1);\n";
OS << "}\n";
OS << "#endif // GET_INTRINSIC_ATTRIBUTES\n\n";
}
/// EmitModRefBehavior - Determine intrinsic alias analysis mod/ref behavior.
void IntrinsicEmitter::
EmitModRefBehavior(const std::vector<CodeGenIntrinsic> &Ints, raw_ostream &OS){
OS << "// Determine intrinsic alias analysis mod/ref behavior.\n";
OS << "#ifdef GET_INTRINSIC_MODREF_BEHAVIOR\n";
OS << "switch (iid) {\n";
OS << "default:\n return UnknownModRefBehavior;\n";
for (unsigned i = 0, e = Ints.size(); i != e; ++i) {
if (Ints[i].ModRef == CodeGenIntrinsic::WriteMem)
continue;
OS << "case " << TargetPrefix << "Intrinsic::" << Ints[i].EnumName
<< ":\n";
switch (Ints[i].ModRef) {
default:
assert(false && "Unknown Mod/Ref type!");
case CodeGenIntrinsic::NoMem:
OS << " return DoesNotAccessMemory;\n";
break;
case CodeGenIntrinsic::ReadArgMem:
case CodeGenIntrinsic::ReadMem:
OS << " return OnlyReadsMemory;\n";
break;
case CodeGenIntrinsic::WriteArgMem:
OS << " return AccessesArguments;\n";
break;
}
}
OS << "}\n";
OS << "#endif // GET_INTRINSIC_MODREF_BEHAVIOR\n\n";
}
void IntrinsicEmitter::
EmitGCCBuiltinList(const std::vector<CodeGenIntrinsic> &Ints, raw_ostream &OS){
OS << "// Get the GCC builtin that corresponds to an LLVM intrinsic.\n";
OS << "#ifdef GET_GCC_BUILTIN_NAME\n";
OS << " switch (F->getIntrinsicID()) {\n";
OS << " default: BuiltinName = \"\"; break;\n";
for (unsigned i = 0, e = Ints.size(); i != e; ++i) {
if (!Ints[i].GCCBuiltinName.empty()) {
OS << " case Intrinsic::" << Ints[i].EnumName << ": BuiltinName = \""
<< Ints[i].GCCBuiltinName << "\"; break;\n";
}
}
OS << " }\n";
OS << "#endif\n\n";
}
/// EmitBuiltinComparisons - Emit comparisons to determine whether the specified
/// sorted range of builtin names is equal to the current builtin. This breaks
/// it down into a simple tree.
///
/// At this point, we know that all the builtins in the range have the same name
/// for the first 'CharStart' characters. Only the end of the name needs to be
/// discriminated.
typedef std::map<std::string, std::string>::const_iterator StrMapIterator;
static void EmitBuiltinComparisons(StrMapIterator Start, StrMapIterator End,
unsigned CharStart, unsigned Indent,
std::string TargetPrefix, raw_ostream &OS) {
if (Start == End) return; // empty range.
// Determine what, if anything, is the same about all these strings.
std::string CommonString = Start->first;
unsigned NumInRange = 0;
for (StrMapIterator I = Start; I != End; ++I, ++NumInRange) {
// Find the first character that doesn't match.
const std::string &ThisStr = I->first;
unsigned NonMatchChar = CharStart;
while (NonMatchChar < CommonString.size() &&
NonMatchChar < ThisStr.size() &&
CommonString[NonMatchChar] == ThisStr[NonMatchChar])
++NonMatchChar;
// Truncate off pieces that don't match.
CommonString.resize(NonMatchChar);
}
// Just compare the rest of the string.
if (NumInRange == 1) {
if (CharStart != CommonString.size()) {
OS << std::string(Indent*2, ' ') << "if (!memcmp(BuiltinName";
if (CharStart) OS << "+" << CharStart;
OS << ", \"" << (CommonString.c_str()+CharStart) << "\", ";
OS << CommonString.size() - CharStart << "))\n";
++Indent;
}
OS << std::string(Indent*2, ' ') << "IntrinsicID = " << TargetPrefix
<< "Intrinsic::";
OS << Start->second << ";\n";
return;
}
// At this point, we potentially have a common prefix for these builtins, emit
// a check for this common prefix.
if (CommonString.size() != CharStart) {
OS << std::string(Indent*2, ' ') << "if (!memcmp(BuiltinName";
if (CharStart) OS << "+" << CharStart;
OS << ", \"" << (CommonString.c_str()+CharStart) << "\", ";
OS << CommonString.size()-CharStart << ")) {\n";
EmitBuiltinComparisons(Start, End, CommonString.size(), Indent+1,
TargetPrefix, OS);
OS << std::string(Indent*2, ' ') << "}\n";
return;
}
// Output a switch on the character that differs across the set.
OS << std::string(Indent*2, ' ') << "switch (BuiltinName[" << CharStart
<< "]) {";
if (CharStart)
OS << " // \"" << std::string(Start->first.begin(),
Start->first.begin()+CharStart) << "\"";
OS << "\n";
for (StrMapIterator I = Start; I != End; ) {
char ThisChar = I->first[CharStart];
OS << std::string(Indent*2, ' ') << "case '" << ThisChar << "':\n";
// Figure out the range that has this common character.
StrMapIterator NextChar = I;
for (++NextChar; NextChar != End && NextChar->first[CharStart] == ThisChar;
++NextChar)
/*empty*/;
EmitBuiltinComparisons(I, NextChar, CharStart+1, Indent+1, TargetPrefix,OS);
OS << std::string(Indent*2, ' ') << " break;\n";
I = NextChar;
}
OS << std::string(Indent*2, ' ') << "}\n";
}
/// EmitTargetBuiltins - All of the builtins in the specified map are for the
/// same target, and we already checked it.
static void EmitTargetBuiltins(const std::map<std::string, std::string> &BIM,
const std::string &TargetPrefix,
raw_ostream &OS) {
// Rearrange the builtins by length.
std::vector<std::map<std::string, std::string> > BuiltinsByLen;
BuiltinsByLen.reserve(100);
for (StrMapIterator I = BIM.begin(), E = BIM.end(); I != E; ++I) {
if (I->first.size() >= BuiltinsByLen.size())
BuiltinsByLen.resize(I->first.size()+1);
BuiltinsByLen[I->first.size()].insert(*I);
}
// Now that we have all the builtins by their length, emit a switch stmt.
OS << " switch (strlen(BuiltinName)) {\n";
OS << " default: break;\n";
for (unsigned i = 0, e = BuiltinsByLen.size(); i != e; ++i) {
if (BuiltinsByLen[i].empty()) continue;
OS << " case " << i << ":\n";
EmitBuiltinComparisons(BuiltinsByLen[i].begin(), BuiltinsByLen[i].end(),
0, 3, TargetPrefix, OS);
OS << " break;\n";
}
OS << " }\n";
}
void IntrinsicEmitter::
EmitIntrinsicToGCCBuiltinMap(const std::vector<CodeGenIntrinsic> &Ints,
raw_ostream &OS) {
typedef std::map<std::string, std::map<std::string, std::string> > BIMTy;
BIMTy BuiltinMap;
for (unsigned i = 0, e = Ints.size(); i != e; ++i) {
if (!Ints[i].GCCBuiltinName.empty()) {
// Get the map for this target prefix.
std::map<std::string, std::string> &BIM =BuiltinMap[Ints[i].TargetPrefix];
if (!BIM.insert(std::make_pair(Ints[i].GCCBuiltinName,
Ints[i].EnumName)).second)
throw "Intrinsic '" + Ints[i].TheDef->getName() +
"': duplicate GCC builtin name!";
}
}
OS << "// Get the LLVM intrinsic that corresponds to a GCC builtin.\n";
OS << "// This is used by the C front-end. The GCC builtin name is passed\n";
OS << "// in as BuiltinName, and a target prefix (e.g. 'ppc') is passed\n";
OS << "// in as TargetPrefix. The result is assigned to 'IntrinsicID'.\n";
OS << "#ifdef GET_LLVM_INTRINSIC_FOR_GCC_BUILTIN\n";
if (TargetOnly) {
OS << "static " << TargetPrefix << "Intrinsic::ID "
<< "getIntrinsicForGCCBuiltin(const char "
<< "*TargetPrefix, const char *BuiltinName) {\n";
OS << " " << TargetPrefix << "Intrinsic::ID IntrinsicID = ";
} else {
OS << "Intrinsic::ID Intrinsic::getIntrinsicForGCCBuiltin(const char "
<< "*TargetPrefix, const char *BuiltinName) {\n";
OS << " Intrinsic::ID IntrinsicID = ";
}
if (TargetOnly)
OS << "(" << TargetPrefix<< "Intrinsic::ID)";
OS << "Intrinsic::not_intrinsic;\n";
// Note: this could emit significantly better code if we cared.
for (BIMTy::iterator I = BuiltinMap.begin(), E = BuiltinMap.end();I != E;++I){
OS << " ";
if (!I->first.empty())
OS << "if (!strcmp(TargetPrefix, \"" << I->first << "\")) ";
else
OS << "/* Target Independent Builtins */ ";
OS << "{\n";
// Emit the comparisons for this target prefix.
EmitTargetBuiltins(I->second, TargetPrefix, OS);
OS << " }\n";
}
OS << " return IntrinsicID;\n";
OS << "}\n";
OS << "#endif\n\n";
}
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