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//===- DAGISelMatcherEmitter.cpp - Matcher Emitter ------------------------===//
//
// The LLVM Compiler Infrastructure
//
// This file is distributed under the University of Illinois Open Source
// License. See LICENSE.TXT for details.
//
//===----------------------------------------------------------------------===//
//
// This file contains code to generate C++ code a matcher.
//
//===----------------------------------------------------------------------===//
#include "DAGISelMatcher.h"
#include "CodeGenDAGPatterns.h"
#include "llvm/ADT/SmallString.h"
#include "llvm/Support/Casting.h"
#include "llvm/Support/FormattedStream.h"
using namespace llvm;
namespace {
enum {
CommentIndent = 25
};
}
static unsigned EmitMatcherAndChildren(const MatcherNode *N,
formatted_raw_ostream &FOS,
unsigned Indent);
/// ClassifyInt - Classify an integer by size, return '1','2','4','8' if this
/// fits in 1, 2, 4, or 8 sign extended bytes.
static char ClassifyInt(int64_t Val) {
if (Val == int8_t(Val)) return '1';
if (Val == int16_t(Val)) return '2';
if (Val == int32_t(Val)) return '4';
return '8';
}
/// EmitInt - Emit the specified integer, returning the number of bytes emitted.
static unsigned EmitInt(int64_t Val, formatted_raw_ostream &OS) {
unsigned BytesEmitted = 1;
OS << (int)(unsigned char)Val << ", ";
if (Val == int8_t(Val)) {
OS << "\n";
return BytesEmitted;
}
OS << (int)(unsigned char)(Val >> 8) << ", ";
++BytesEmitted;
if (Val != int16_t(Val)) {
OS << (int)(unsigned char)(Val >> 16) << ','
<< (int)(unsigned char)(Val >> 24) << ',';
BytesEmitted += 2;
if (Val != int32_t(Val)) {
OS << (int)(unsigned char)(Val >> 32) << ','
<< (int)(unsigned char)(Val >> 40) << ','
<< (int)(unsigned char)(Val >> 48) << ','
<< (int)(unsigned char)(Val >> 56) << ',';
BytesEmitted += 4;
}
}
OS.PadToColumn(CommentIndent) << "// " << Val << '\n';
return BytesEmitted;
}
/// EmitMatcherOpcodes - Emit bytes for the specified matcher and return
/// the number of bytes emitted.
static unsigned EmitMatcher(const MatcherNode *N, formatted_raw_ostream &OS,
unsigned Indent) {
OS.PadToColumn(Indent*2);
switch (N->getKind()) {
case MatcherNode::Push: assert(0 && "Should be handled by caller");
case MatcherNode::EmitNode:
OS << "OPC_Emit, /*XXX*/";
OS.PadToColumn(CommentIndent) << "// Src: "
<< *cast<EmitNodeMatcherNode>(N)->getPattern().getSrcPattern() << '\n';
OS.PadToColumn(CommentIndent) << "// Dst: "
<< *cast<EmitNodeMatcherNode>(N)->getPattern().getDstPattern() << '\n';
return 1;
case MatcherNode::Record:
OS << "OPC_Record,\n";
return 1;
case MatcherNode::MoveChild:
OS << "OPC_MoveChild, "
<< cast<MoveChildMatcherNode>(N)->getChildNo() << ",\n";
return 2;
case MatcherNode::MoveParent:
OS << "OPC_MoveParent,\n";
return 1;
case MatcherNode::CheckSame:
OS << "OPC_CheckSame, "
<< cast<CheckSameMatcherNode>(N)->getMatchNumber() << ",\n";
return 2;
case MatcherNode::CheckPatternPredicate:
OS << "OPC_CheckPatternPredicate, /*XXX*/0,";
OS.PadToColumn(CommentIndent) << "// "
<< cast<CheckPatternPredicateMatcherNode>(N)->getPredicate() << '\n';
return 2;
case MatcherNode::CheckPredicate:
OS << "OPC_CheckPredicate, /*XXX*/0,";
OS.PadToColumn(CommentIndent) << "// "
<< cast<CheckPredicateMatcherNode>(N)->getPredicateName() << '\n';
return 2;
case MatcherNode::CheckOpcode:
OS << "OPC_CheckOpcode, "
<< cast<CheckOpcodeMatcherNode>(N)->getOpcodeName() << ",\n";
return 2;
case MatcherNode::CheckType:
OS << "OPC_CheckType, "
<< getEnumName(cast<CheckTypeMatcherNode>(N)->getType()) << ",\n";
return 2;
case MatcherNode::CheckInteger: {
int64_t Val = cast<CheckIntegerMatcherNode>(N)->getValue();
OS << "OPC_CheckInteger" << ClassifyInt(Val) << ", ";
return EmitInt(Val, OS)+1;
}
case MatcherNode::CheckCondCode:
OS << "OPC_CheckCondCode, ISD::"
<< cast<CheckCondCodeMatcherNode>(N)->getCondCodeName() << ",\n";
return 2;
case MatcherNode::CheckValueType:
OS << "OPC_CheckValueType, MVT::"
<< cast<CheckValueTypeMatcherNode>(N)->getTypeName() << ",\n";
return 2;
case MatcherNode::CheckComplexPat:
OS << "OPC_CheckComplexPat, 0/*XXX*/,\n";
return 2;
case MatcherNode::CheckAndImm: {
int64_t Val = cast<CheckAndImmMatcherNode>(N)->getValue();
OS << "OPC_CheckAndImm" << ClassifyInt(Val) << ", ";
return EmitInt(Val, OS)+1;
}
case MatcherNode::CheckOrImm: {
int64_t Val = cast<CheckOrImmMatcherNode>(N)->getValue();
OS << "OPC_CheckOrImm" << ClassifyInt(Val) << ", ";
return EmitInt(Val, OS)+1;
}
}
assert(0 && "Unreachable");
return 0;
}
/// EmitMatcherAndChildren - Emit the bytes for the specified matcher subtree.
static unsigned EmitMatcherAndChildren(const MatcherNode *N,
formatted_raw_ostream &OS,
unsigned Indent) {
unsigned Size = 0;
while (1) {
// Push is a special case since it is binary.
if (const PushMatcherNode *PMN = dyn_cast<PushMatcherNode>(N)) {
// We need to encode the child and the offset of the failure code before
// emitting either of them. Handle this by buffering the output into a
// string while we get the size.
SmallString<128> TmpBuf;
unsigned ChildSize;
{
raw_svector_ostream OS(TmpBuf);
formatted_raw_ostream FOS(OS);
ChildSize =
EmitMatcherAndChildren(cast<PushMatcherNode>(N)->getChild(), FOS,
Indent+1);
}
if (ChildSize > 255) {
errs() <<
"Tblgen internal error: can't handle predicate this complex yet\n";
exit(1);
}
OS.PadToColumn(Indent*2);
OS << "OPC_Push, " << ChildSize << ",\n";
OS << TmpBuf.str();
Size += 2 + ChildSize;
N = PMN->getFailure();
continue;
}
Size += EmitMatcher(N, OS, Indent);
// If there are children of this node, iterate to them, otherwise we're
// done.
if (const MatcherNodeWithChild *MNWC = dyn_cast<MatcherNodeWithChild>(N))
N = MNWC->getChild();
else
return Size;
}
}
void llvm::EmitMatcherTable(const MatcherNode *Matcher, raw_ostream &O) {
formatted_raw_ostream OS(O);
OS << "// The main instruction selector code.\n";
OS << "SDNode *SelectCode2(SDNode *N) {\n";
OS << " static const unsigned char MatcherTable[] = {\n";
unsigned TotalSize = EmitMatcherAndChildren(Matcher, OS, 2);
OS << " 0\n }; // Total Array size is " << (TotalSize+1) << " bytes\n\n";
OS << " return SelectCodeCommon(N, MatcherTable, sizeof(MatcherTable));\n}\n";
}
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