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https://github.com/c64scene-ar/llvm-6502.git
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the VC++ 'nesting depth' issue. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@45567 91177308-0d34-0410-b5e6-96231b3b80d8
486 lines
17 KiB
C++
486 lines
17 KiB
C++
//===- IntrinsicEmitter.cpp - Generate intrinsic information --------------===//
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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 tablegen backend emits information about intrinsic functions.
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//
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//===----------------------------------------------------------------------===//
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#include "CodeGenTarget.h"
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#include "IntrinsicEmitter.h"
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#include "Record.h"
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#include "llvm/ADT/StringExtras.h"
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#include <algorithm>
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using namespace llvm;
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//===----------------------------------------------------------------------===//
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// IntrinsicEmitter Implementation
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//===----------------------------------------------------------------------===//
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void IntrinsicEmitter::run(std::ostream &OS) {
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EmitSourceFileHeader("Intrinsic Function Source Fragment", OS);
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std::vector<CodeGenIntrinsic> Ints = LoadIntrinsics(Records);
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// Emit the enum information.
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EmitEnumInfo(Ints, OS);
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// Emit the intrinsic ID -> name table.
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EmitIntrinsicToNameTable(Ints, OS);
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// Emit the function name recognizer.
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EmitFnNameRecognizer(Ints, OS);
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// Emit the intrinsic verifier.
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EmitVerifier(Ints, OS);
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// Emit the intrinsic declaration generator.
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EmitGenerator(Ints, OS);
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// Emit the intrinsic parameter attributes.
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EmitAttributes(Ints, OS);
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// Emit a list of intrinsics with corresponding GCC builtins.
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EmitGCCBuiltinList(Ints, OS);
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// Emit code to translate GCC builtins into LLVM intrinsics.
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EmitIntrinsicToGCCBuiltinMap(Ints, OS);
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}
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void IntrinsicEmitter::EmitEnumInfo(const std::vector<CodeGenIntrinsic> &Ints,
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std::ostream &OS) {
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OS << "// Enum values for Intrinsics.h\n";
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OS << "#ifdef GET_INTRINSIC_ENUM_VALUES\n";
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for (unsigned i = 0, e = Ints.size(); i != e; ++i) {
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OS << " " << Ints[i].EnumName;
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OS << ((i != e-1) ? ", " : " ");
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OS << std::string(40-Ints[i].EnumName.size(), ' ')
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<< "// " << Ints[i].Name << "\n";
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}
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OS << "#endif\n\n";
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}
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void IntrinsicEmitter::
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EmitFnNameRecognizer(const std::vector<CodeGenIntrinsic> &Ints,
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std::ostream &OS) {
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// Build a function name -> intrinsic name mapping.
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std::map<std::string, unsigned> IntMapping;
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for (unsigned i = 0, e = Ints.size(); i != e; ++i)
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IntMapping[Ints[i].Name] = i;
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OS << "// Function name -> enum value recognizer code.\n";
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OS << "#ifdef GET_FUNCTION_RECOGNIZER\n";
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OS << " switch (Name[5]) {\n";
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OS << " default:\n";
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// Emit the intrinsics in sorted order.
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char LastChar = 0;
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for (std::map<std::string, unsigned>::iterator I = IntMapping.begin(),
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E = IntMapping.end(); I != E; ++I) {
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if (I->first[5] != LastChar) {
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LastChar = I->first[5];
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OS << " break;\n";
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OS << " case '" << LastChar << "':\n";
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}
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// For overloaded intrinsics, only the prefix needs to match
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if (Ints[I->second].isOverloaded)
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OS << " if (Len > " << I->first.size()
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<< " && !memcmp(Name, \"" << I->first << ".\", "
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<< (I->first.size() + 1) << ")) return Intrinsic::"
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<< Ints[I->second].EnumName << ";\n";
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else
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OS << " if (Len == " << I->first.size()
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<< " && !memcmp(Name, \"" << I->first << "\", "
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<< I->first.size() << ")) return Intrinsic::"
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<< Ints[I->second].EnumName << ";\n";
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}
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OS << " }\n";
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OS << "#endif\n\n";
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}
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void IntrinsicEmitter::
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EmitIntrinsicToNameTable(const std::vector<CodeGenIntrinsic> &Ints,
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std::ostream &OS) {
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OS << "// Intrinsic ID to name table\n";
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OS << "#ifdef GET_INTRINSIC_NAME_TABLE\n";
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OS << " // Note that entry #0 is the invalid intrinsic!\n";
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for (unsigned i = 0, e = Ints.size(); i != e; ++i)
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OS << " \"" << Ints[i].Name << "\",\n";
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OS << "#endif\n\n";
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}
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static void EmitTypeForValueType(std::ostream &OS, MVT::ValueType VT) {
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if (MVT::isInteger(VT)) {
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unsigned BitWidth = MVT::getSizeInBits(VT);
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OS << "IntegerType::get(" << BitWidth << ")";
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} else if (VT == MVT::Other) {
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// MVT::OtherVT is used to mean the empty struct type here.
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OS << "StructType::get(std::vector<const Type *>())";
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} else if (VT == MVT::f32) {
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OS << "Type::FloatTy";
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} else if (VT == MVT::f64) {
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OS << "Type::DoubleTy";
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} else if (VT == MVT::f80) {
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OS << "Type::X86_FP80Ty";
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} else if (VT == MVT::f128) {
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OS << "Type::FP128Ty";
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} else if (VT == MVT::ppcf128) {
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OS << "Type::PPC_FP128Ty";
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} else if (VT == MVT::isVoid) {
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OS << "Type::VoidTy";
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} else {
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assert(false && "Unsupported ValueType!");
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}
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}
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static void EmitTypeGenerate(std::ostream &OS, Record *ArgType,
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unsigned &ArgNo) {
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MVT::ValueType VT = getValueType(ArgType->getValueAsDef("VT"));
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if (ArgType->isSubClassOf("LLVMMatchType")) {
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unsigned Number = ArgType->getValueAsInt("Number");
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assert(Number < ArgNo && "Invalid matching number!");
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OS << "Tys[" << Number << "]";
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} else if (VT == MVT::iAny || VT == MVT::fAny) {
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// NOTE: The ArgNo variable here is not the absolute argument number, it is
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// the index of the "arbitrary" type in the Tys array passed to the
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// Intrinsic::getDeclaration function. Consequently, we only want to
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// increment it when we actually hit an overloaded type. Getting this wrong
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// leads to very subtle bugs!
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OS << "Tys[" << ArgNo++ << "]";
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} else if (MVT::isVector(VT)) {
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OS << "VectorType::get(";
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EmitTypeForValueType(OS, MVT::getVectorElementType(VT));
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OS << ", " << MVT::getVectorNumElements(VT) << ")";
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} else if (VT == MVT::iPTR) {
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OS << "PointerType::getUnqual(";
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EmitTypeGenerate(OS, ArgType->getValueAsDef("ElTy"), ArgNo);
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OS << ")";
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} else if (VT == MVT::isVoid) {
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if (ArgNo == 0)
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OS << "Type::VoidTy";
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else
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// MVT::isVoid is used to mean varargs here.
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OS << "...";
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} else {
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EmitTypeForValueType(OS, VT);
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}
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}
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/// RecordListComparator - Provide a determinstic comparator for lists of
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/// records.
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namespace {
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struct RecordListComparator {
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bool operator()(const std::vector<Record*> &LHS,
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const std::vector<Record*> &RHS) const {
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unsigned i = 0;
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do {
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if (i == RHS.size()) return false; // RHS is shorter than LHS.
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if (LHS[i] != RHS[i])
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return LHS[i]->getName() < RHS[i]->getName();
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} while (++i != LHS.size());
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return i != RHS.size();
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}
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};
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}
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void IntrinsicEmitter::EmitVerifier(const std::vector<CodeGenIntrinsic> &Ints,
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std::ostream &OS) {
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OS << "// Verifier::visitIntrinsicFunctionCall code.\n";
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OS << "#ifdef GET_INTRINSIC_VERIFIER\n";
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OS << " switch (ID) {\n";
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OS << " default: assert(0 && \"Invalid intrinsic!\");\n";
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// This checking can emit a lot of very common code. To reduce the amount of
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// code that we emit, batch up cases that have identical types. This avoids
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// problems where GCC can run out of memory compiling Verifier.cpp.
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typedef std::map<std::vector<Record*>, std::vector<unsigned>,
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RecordListComparator> MapTy;
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MapTy UniqueArgInfos;
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// Compute the unique argument type info.
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for (unsigned i = 0, e = Ints.size(); i != e; ++i)
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UniqueArgInfos[Ints[i].ArgTypeDefs].push_back(i);
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// Loop through the array, emitting one comparison for each batch.
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for (MapTy::iterator I = UniqueArgInfos.begin(),
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E = UniqueArgInfos.end(); I != E; ++I) {
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for (unsigned i = 0, e = I->second.size(); i != e; ++i) {
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OS << " case Intrinsic::" << Ints[I->second[i]].EnumName << ":\t\t// "
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<< Ints[I->second[i]].Name << "\n";
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}
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const std::vector<Record*> &ArgTypes = I->first;
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OS << " VerifyIntrinsicPrototype(ID, IF, " << ArgTypes.size() << ", ";
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for (unsigned j = 0; j != ArgTypes.size(); ++j) {
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Record *ArgType = ArgTypes[j];
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if (ArgType->isSubClassOf("LLVMMatchType")) {
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unsigned Number = ArgType->getValueAsInt("Number");
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assert(Number < j && "Invalid matching number!");
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OS << "~" << Number;
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} else {
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MVT::ValueType VT = getValueType(ArgType->getValueAsDef("VT"));
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OS << getEnumName(VT);
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if (VT == MVT::isVoid && j != 0 && j != ArgTypes.size()-1)
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throw "Var arg type not last argument";
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}
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if (j != ArgTypes.size()-1)
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OS << ", ";
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}
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OS << ");\n";
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OS << " break;\n";
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}
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OS << " }\n";
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OS << "#endif\n\n";
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}
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void IntrinsicEmitter::EmitGenerator(const std::vector<CodeGenIntrinsic> &Ints,
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std::ostream &OS) {
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OS << "// Code for generating Intrinsic function declarations.\n";
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OS << "#ifdef GET_INTRINSIC_GENERATOR\n";
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OS << " switch (id) {\n";
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OS << " default: assert(0 && \"Invalid intrinsic!\");\n";
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// Similar to GET_INTRINSIC_VERIFIER, batch up cases that have identical
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// types.
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typedef std::map<std::vector<Record*>, std::vector<unsigned>,
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RecordListComparator> MapTy;
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MapTy UniqueArgInfos;
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// Compute the unique argument type info.
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for (unsigned i = 0, e = Ints.size(); i != e; ++i)
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UniqueArgInfos[Ints[i].ArgTypeDefs].push_back(i);
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// Loop through the array, emitting one generator for each batch.
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for (MapTy::iterator I = UniqueArgInfos.begin(),
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E = UniqueArgInfos.end(); I != E; ++I) {
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for (unsigned i = 0, e = I->second.size(); i != e; ++i) {
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OS << " case Intrinsic::" << Ints[I->second[i]].EnumName << ":\t\t// "
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<< Ints[I->second[i]].Name << "\n";
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}
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const std::vector<Record*> &ArgTypes = I->first;
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unsigned N = ArgTypes.size();
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if (N > 1 &&
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getValueType(ArgTypes[N-1]->getValueAsDef("VT")) == MVT::isVoid) {
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OS << " IsVarArg = true;\n";
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--N;
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}
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unsigned ArgNo = 0;
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OS << " ResultTy = ";
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EmitTypeGenerate(OS, ArgTypes[0], ArgNo);
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OS << ";\n";
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for (unsigned j = 1; j != N; ++j) {
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OS << " ArgTys.push_back(";
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EmitTypeGenerate(OS, ArgTypes[j], ArgNo);
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OS << ");\n";
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}
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OS << " break;\n";
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}
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OS << " }\n";
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OS << "#endif\n\n";
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}
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void IntrinsicEmitter::
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EmitAttributes(const std::vector<CodeGenIntrinsic> &Ints, std::ostream &OS) {
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OS << "// Add parameter attributes that are not common to all intrinsics.\n";
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OS << "#ifdef GET_INTRINSIC_ATTRIBUTES\n";
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OS << " switch (id) {\n";
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OS << " default: break;\n";
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for (unsigned i = 0, e = Ints.size(); i != e; ++i) {
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switch (Ints[i].ModRef) {
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default: break;
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case CodeGenIntrinsic::NoMem:
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OS << " case Intrinsic::" << Ints[i].EnumName << ":\n";
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break;
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}
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}
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OS << " Attr |= ParamAttr::ReadNone; // These do not access memory.\n";
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OS << " break;\n";
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for (unsigned i = 0, e = Ints.size(); i != e; ++i) {
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switch (Ints[i].ModRef) {
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default: break;
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case CodeGenIntrinsic::ReadArgMem:
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case CodeGenIntrinsic::ReadMem:
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OS << " case Intrinsic::" << Ints[i].EnumName << ":\n";
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break;
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}
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}
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OS << " Attr |= ParamAttr::ReadOnly; // These do not write memory.\n";
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OS << " break;\n";
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OS << " }\n";
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OS << "#endif\n\n";
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}
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void IntrinsicEmitter::
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EmitGCCBuiltinList(const std::vector<CodeGenIntrinsic> &Ints, std::ostream &OS){
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OS << "// Get the GCC builtin that corresponds to an LLVM intrinsic.\n";
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OS << "#ifdef GET_GCC_BUILTIN_NAME\n";
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OS << " switch (F->getIntrinsicID()) {\n";
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OS << " default: BuiltinName = \"\"; break;\n";
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for (unsigned i = 0, e = Ints.size(); i != e; ++i) {
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if (!Ints[i].GCCBuiltinName.empty()) {
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OS << " case Intrinsic::" << Ints[i].EnumName << ": BuiltinName = \""
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<< Ints[i].GCCBuiltinName << "\"; break;\n";
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}
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}
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OS << " }\n";
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OS << "#endif\n\n";
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}
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/// EmitBuiltinComparisons - Emit comparisons to determine whether the specified
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/// sorted range of builtin names is equal to the current builtin. This breaks
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/// it down into a simple tree.
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///
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/// At this point, we know that all the builtins in the range have the same name
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/// for the first 'CharStart' characters. Only the end of the name needs to be
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/// discriminated.
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typedef std::map<std::string, std::string>::const_iterator StrMapIterator;
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static void EmitBuiltinComparisons(StrMapIterator Start, StrMapIterator End,
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unsigned CharStart, unsigned Indent,
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std::ostream &OS) {
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if (Start == End) return; // empty range.
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// Determine what, if anything, is the same about all these strings.
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std::string CommonString = Start->first;
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unsigned NumInRange = 0;
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for (StrMapIterator I = Start; I != End; ++I, ++NumInRange) {
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// Find the first character that doesn't match.
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const std::string &ThisStr = I->first;
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unsigned NonMatchChar = CharStart;
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while (NonMatchChar < CommonString.size() &&
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NonMatchChar < ThisStr.size() &&
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CommonString[NonMatchChar] == ThisStr[NonMatchChar])
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++NonMatchChar;
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// Truncate off pieces that don't match.
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CommonString.resize(NonMatchChar);
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}
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// Just compare the rest of the string.
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if (NumInRange == 1) {
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if (CharStart != CommonString.size()) {
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OS << std::string(Indent*2, ' ') << "if (!memcmp(BuiltinName";
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if (CharStart) OS << "+" << CharStart;
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OS << ", \"" << (CommonString.c_str()+CharStart) << "\", ";
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OS << CommonString.size() - CharStart << "))\n";
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++Indent;
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}
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OS << std::string(Indent*2, ' ') << "IntrinsicID = Intrinsic::";
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OS << Start->second << ";\n";
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return;
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}
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// At this point, we potentially have a common prefix for these builtins, emit
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// a check for this common prefix.
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if (CommonString.size() != CharStart) {
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OS << std::string(Indent*2, ' ') << "if (!memcmp(BuiltinName";
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if (CharStart) OS << "+" << CharStart;
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OS << ", \"" << (CommonString.c_str()+CharStart) << "\", ";
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OS << CommonString.size()-CharStart << ")) {\n";
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EmitBuiltinComparisons(Start, End, CommonString.size(), Indent+1, OS);
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OS << std::string(Indent*2, ' ') << "}\n";
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return;
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}
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// Output a switch on the character that differs across the set.
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OS << std::string(Indent*2, ' ') << "switch (BuiltinName[" << CharStart
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<< "]) {";
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if (CharStart)
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OS << " // \"" << std::string(Start->first.begin(),
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Start->first.begin()+CharStart) << "\"";
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OS << "\n";
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for (StrMapIterator I = Start; I != End; ) {
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char ThisChar = I->first[CharStart];
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OS << std::string(Indent*2, ' ') << "case '" << ThisChar << "':\n";
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// Figure out the range that has this common character.
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StrMapIterator NextChar = I;
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for (++NextChar; NextChar != End && NextChar->first[CharStart] == ThisChar;
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++NextChar)
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/*empty*/;
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EmitBuiltinComparisons(I, NextChar, CharStart+1, Indent+1, OS);
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OS << std::string(Indent*2, ' ') << " break;\n";
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I = NextChar;
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}
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OS << std::string(Indent*2, ' ') << "}\n";
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}
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/// EmitTargetBuiltins - All of the builtins in the specified map are for the
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/// same target, and we already checked it.
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static void EmitTargetBuiltins(const std::map<std::string, std::string> &BIM,
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std::ostream &OS) {
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// Rearrange the builtins by length.
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std::vector<std::map<std::string, std::string> > BuiltinsByLen;
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BuiltinsByLen.reserve(100);
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for (StrMapIterator I = BIM.begin(), E = BIM.end(); I != E; ++I) {
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if (I->first.size() >= BuiltinsByLen.size())
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BuiltinsByLen.resize(I->first.size()+1);
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BuiltinsByLen[I->first.size()].insert(*I);
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}
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// Now that we have all the builtins by their length, emit a switch stmt.
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OS << " switch (strlen(BuiltinName)) {\n";
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OS << " default: break;\n";
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for (unsigned i = 0, e = BuiltinsByLen.size(); i != e; ++i) {
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if (BuiltinsByLen[i].empty()) continue;
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OS << " case " << i << ":\n";
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EmitBuiltinComparisons(BuiltinsByLen[i].begin(), BuiltinsByLen[i].end(),
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0, 3, OS);
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OS << " break;\n";
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}
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OS << " }\n";
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}
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void IntrinsicEmitter::
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EmitIntrinsicToGCCBuiltinMap(const std::vector<CodeGenIntrinsic> &Ints,
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std::ostream &OS) {
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typedef std::map<std::string, std::map<std::string, std::string> > BIMTy;
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BIMTy BuiltinMap;
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for (unsigned i = 0, e = Ints.size(); i != e; ++i) {
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if (!Ints[i].GCCBuiltinName.empty()) {
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// Get the map for this target prefix.
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std::map<std::string, std::string> &BIM =BuiltinMap[Ints[i].TargetPrefix];
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if (!BIM.insert(std::make_pair(Ints[i].GCCBuiltinName,
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Ints[i].EnumName)).second)
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throw "Intrinsic '" + Ints[i].TheDef->getName() +
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"': duplicate GCC builtin name!";
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}
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}
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OS << "// Get the LLVM intrinsic that corresponds to a GCC builtin.\n";
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OS << "// This is used by the C front-end. The GCC builtin name is passed\n";
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OS << "// in as BuiltinName, and a target prefix (e.g. 'ppc') is passed\n";
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OS << "// in as TargetPrefix. The result is assigned to 'IntrinsicID'.\n";
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OS << "#ifdef GET_LLVM_INTRINSIC_FOR_GCC_BUILTIN\n";
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OS << " IntrinsicID = Intrinsic::not_intrinsic;\n";
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// Note: this could emit significantly better code if we cared.
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for (BIMTy::iterator I = BuiltinMap.begin(), E = BuiltinMap.end();I != E;++I){
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OS << " ";
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if (!I->first.empty())
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OS << "if (!strcmp(TargetPrefix, \"" << I->first << "\")) ";
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else
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OS << "/* Target Independent Builtins */ ";
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OS << "{\n";
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// Emit the comparisons for this target prefix.
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EmitTargetBuiltins(I->second, OS);
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OS << " }\n";
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}
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OS << "#endif\n\n";
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}
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