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git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@30725 91177308-0d34-0410-b5e6-96231b3b80d8
288 lines
10 KiB
C++
288 lines
10 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 was developed by Chris Lattner and is distributed under
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// the University of Illinois Open Source 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 "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 mod/ref info for each function.
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EmitModRefInfo(Ints, OS);
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// Emit table of non-memory accessing intrinsics.
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EmitNoMemoryInfo(Ints, OS);
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// Emit side effect info for each intrinsic.
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EmitSideEffectInfo(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, std::string> IntMapping;
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for (unsigned i = 0, e = Ints.size(); i != e; ++i)
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IntMapping[Ints[i].Name] = Ints[i].EnumName;
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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: break;\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, std::string>::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 << " case '" << LastChar << "':\n";
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}
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OS << " if (Name == \"" << I->first << "\") return Intrinsic::"
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<< I->second << ";\n";
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}
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OS << " }\n";
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OS << " // The 'llvm.' namespace is reserved!\n";
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OS << " assert(0 && \"Unknown LLVM intrinsic function!\");\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 EmitTypeVerify(std::ostream &OS, Record *ArgType) {
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OS << "(int)" << ArgType->getValueAsString("TypeVal") << ", ";
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// If this is a packed type, check that the subtype and size are correct.
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if (ArgType->isSubClassOf("LLVMPackedType")) {
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Record *SubType = ArgType->getValueAsDef("ElTy");
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OS << "(int)" << SubType->getValueAsString("TypeVal") << ", "
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<< ArgType->getValueAsInt("NumElts") << ", ";
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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(IF, ";
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for (unsigned j = 0; j != ArgTypes.size(); ++j)
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EmitTypeVerify(OS, ArgTypes[j]);
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OS << "-1);\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::EmitModRefInfo(const std::vector<CodeGenIntrinsic> &Ints,
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std::ostream &OS) {
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OS << "// BasicAliasAnalysis code.\n";
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OS << "#ifdef GET_MODREF_BEHAVIOR\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 << " NoMemoryTable->push_back(\"" << Ints[i].Name << "\");\n";
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break;
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case CodeGenIntrinsic::ReadArgMem:
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case CodeGenIntrinsic::ReadMem:
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OS << " OnlyReadsMemoryTable->push_back(\"" << Ints[i].Name << "\");\n";
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break;
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}
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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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EmitNoMemoryInfo(const std::vector<CodeGenIntrinsic> &Ints, std::ostream &OS) {
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OS << "// SelectionDAGIsel code.\n";
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OS << "#ifdef GET_NO_MEMORY_INTRINSICS\n";
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OS << " switch (IntrinsicID) {\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 << " return true; // These intrinsics have no side effects.\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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EmitSideEffectInfo(const std::vector<CodeGenIntrinsic> &Ints, std::ostream &OS){
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OS << "// Return true if doesn't access or only reads memory.\n";
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OS << "#ifdef GET_SIDE_EFFECT_INFO\n";
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OS << " switch (IntrinsicID) {\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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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 << " return true; // These intrinsics have no side effects.\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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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::pair<std::string, 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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std::pair<std::string, std::string> Key(Ints[i].GCCBuiltinName,
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Ints[i].TargetPrefix);
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if (!BuiltinMap.insert(std::make_pair(Key, 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 << " if (0);\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 << " else if (";
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if (!I->first.second.empty()) {
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// Emit this as a strcmp, so it can be constant folded by the FE.
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OS << "!strcmp(TargetPrefix, \"" << I->first.second << "\") &&\n"
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<< " ";
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}
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OS << "!strcmp(BuiltinName, \"" << I->first.first << "\"))\n";
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OS << " IntrinsicID = Intrinsic::" << I->second << ";\n";
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}
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OS << " else\n";
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OS << " IntrinsicID = Intrinsic::not_intrinsic;\n";
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OS << "#endif\n\n";
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}
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