mirror of
https://github.com/c64scene-ar/llvm-6502.git
synced 2025-04-01 03:33:42 +00:00
Check in some useful helper routines for doing ML-style pattern matching on
the LLVM IR. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@15341 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Chris Lattner
parent
ff8c1b3dc6
commit
524d8f1722
280
include/llvm/Support/PatternMatch.h
Normal file
280
include/llvm/Support/PatternMatch.h
Normal file
@ -0,0 +1,280 @@
|
||||
//===-- llvm/Support/PatternMatch.h - Match on the LLVM IR ------*- C++ -*-===//
|
||||
//
|
||||
// The LLVM Compiler Infrastructure
|
||||
//
|
||||
// This file was developed by the LLVM research group and is distributed under
|
||||
// the University of Illinois Open Source License. See LICENSE.TXT for details.
|
||||
//
|
||||
//===----------------------------------------------------------------------===//
|
||||
//
|
||||
// This file provides a simple and efficient mechanism for performing general
|
||||
// tree-based pattern matches on the LLVM IR. The power of these routines is
|
||||
// that it allows you to write concise patterns that are expressive and easy to
|
||||
// understand. The other major advantage of this is that is allows to you
|
||||
// trivially capture/bind elements in the pattern to variables. For example,
|
||||
// you can do something like this:
|
||||
//
|
||||
// Value *Exp = ...
|
||||
// Value *X, *Y; ConstantInt *C1, *C2; // (X & C1) | (Y & C2)
|
||||
// if (match(Exp, m_Or(m_And(m_Value(X), m_ConstantInt(C1)),
|
||||
// m_And(m_Value(Y), m_ConstantInt(C2))))) {
|
||||
// ... Pattern is matched and variables are bound ...
|
||||
// }
|
||||
//
|
||||
// This is primarily useful to things like the instruction combiner, but can
|
||||
// also be useful for static analysis tools or code generators.
|
||||
//
|
||||
//===----------------------------------------------------------------------===//
|
||||
|
||||
#ifndef LLVM_SUPPORT_PATTERNMATCH_H
|
||||
#define LLVM_SUPPORT_PATTERNMATCH_H
|
||||
|
||||
#include "llvm/Constants.h"
|
||||
#include "llvm/Instructions.h"
|
||||
|
||||
namespace llvm {
|
||||
namespace PatternMatch {
|
||||
|
||||
template<typename Val, typename Pattern>
|
||||
bool match(Val *V, Pattern P) {
|
||||
return P.match(V);
|
||||
}
|
||||
|
||||
template<typename Class>
|
||||
struct leaf_ty {
|
||||
template<typename ITy>
|
||||
bool match(ITy *V) { return isa<Class>(V); }
|
||||
};
|
||||
|
||||
inline leaf_ty<Value> m_Value() { return leaf_ty<Value>(); }
|
||||
inline leaf_ty<ConstantInt> m_ConstantInt() { return leaf_ty<ConstantInt>(); }
|
||||
|
||||
template<typename Class>
|
||||
struct bind_ty {
|
||||
Class *&VR;
|
||||
bind_ty(Class*& V) :VR(V) {}
|
||||
|
||||
template<typename ITy>
|
||||
bool match(ITy *V) {
|
||||
if (Class *CV = dyn_cast<Class>(V)) {
|
||||
VR = CV;
|
||||
return true;
|
||||
}
|
||||
return false;
|
||||
}
|
||||
};
|
||||
|
||||
inline bind_ty<Value> m_Value(Value *&V) { return V; }
|
||||
inline bind_ty<ConstantInt> m_ConstantInt(ConstantInt *&CI) { return CI; }
|
||||
|
||||
//===----------------------------------------------------------------------===//
|
||||
// Matchers for specific binary operators
|
||||
//
|
||||
|
||||
template<typename LHS_t, typename RHS_t, unsigned Opcode>
|
||||
struct BinaryOp_match {
|
||||
LHS_t L;
|
||||
RHS_t R;
|
||||
|
||||
BinaryOp_match(const LHS_t &LHS, const RHS_t &RHS) : L(LHS), R(RHS) {}
|
||||
|
||||
template<typename OpTy>
|
||||
bool match(OpTy *V) {
|
||||
if (Instruction *I = dyn_cast<Instruction>(V))
|
||||
return I->getOpcode() == Opcode && L.match(I->getOperand(0)) &&
|
||||
R.match(I->getOperand(1));
|
||||
if (ConstantExpr *CE = dyn_cast<ConstantExpr>(V))
|
||||
return CE->getOpcode() == Opcode && L.match(CE->getOperand(0)) &&
|
||||
R.match(CE->getOperand(1));
|
||||
return false;
|
||||
}
|
||||
};
|
||||
|
||||
template<typename LHS, typename RHS>
|
||||
inline BinaryOp_match<LHS, RHS, Instruction::Add> m_Add(const LHS &L,
|
||||
const RHS &R) {
|
||||
return BinaryOp_match<LHS, RHS, Instruction::Add>(L, R);
|
||||
}
|
||||
|
||||
template<typename LHS, typename RHS>
|
||||
inline BinaryOp_match<LHS, RHS, Instruction::Sub> m_Sub(const LHS &L,
|
||||
const RHS &R) {
|
||||
return BinaryOp_match<LHS, RHS, Instruction::Sub>(L, R);
|
||||
}
|
||||
|
||||
template<typename LHS, typename RHS>
|
||||
inline BinaryOp_match<LHS, RHS, Instruction::Mul> m_Mul(const LHS &L,
|
||||
const RHS &R) {
|
||||
return BinaryOp_match<LHS, RHS, Instruction::Mul>(L, R);
|
||||
}
|
||||
|
||||
template<typename LHS, typename RHS>
|
||||
inline BinaryOp_match<LHS, RHS, Instruction::Div> m_Div(const LHS &L,
|
||||
const RHS &R) {
|
||||
return BinaryOp_match<LHS, RHS, Instruction::Div>(L, R);
|
||||
}
|
||||
|
||||
template<typename LHS, typename RHS>
|
||||
inline BinaryOp_match<LHS, RHS, Instruction::Rem> m_Rem(const LHS &L,
|
||||
const RHS &R) {
|
||||
return BinaryOp_match<LHS, RHS, Instruction::Rem>(L, R);
|
||||
}
|
||||
|
||||
template<typename LHS, typename RHS>
|
||||
inline BinaryOp_match<LHS, RHS, Instruction::And> m_And(const LHS &L,
|
||||
const RHS &R) {
|
||||
return BinaryOp_match<LHS, RHS, Instruction::And>(L, R);
|
||||
}
|
||||
|
||||
template<typename LHS, typename RHS>
|
||||
inline BinaryOp_match<LHS, RHS, Instruction::Rem> m_Or(const LHS &L,
|
||||
const RHS &R) {
|
||||
return BinaryOp_match<LHS, RHS, Instruction::Or>(L, R);
|
||||
}
|
||||
|
||||
template<typename LHS, typename RHS>
|
||||
inline BinaryOp_match<LHS, RHS, Instruction::Xor> m_Xor(const LHS &L,
|
||||
const RHS &R) {
|
||||
return BinaryOp_match<LHS, RHS, Instruction::Xor>(L, R);
|
||||
}
|
||||
|
||||
//===----------------------------------------------------------------------===//
|
||||
// Matchers for binary classes
|
||||
//
|
||||
|
||||
template<typename LHS_t, typename RHS_t, typename Class>
|
||||
struct BinaryOpClass_match {
|
||||
Instruction::BinaryOps &Opcode;
|
||||
LHS_t L;
|
||||
RHS_t R;
|
||||
|
||||
BinaryOpClass_match(Instruction::BinaryOps &Op, const LHS_t &LHS,
|
||||
const RHS_t &RHS)
|
||||
: Opcode(Op), L(LHS), R(RHS) {}
|
||||
|
||||
template<typename OpTy>
|
||||
bool match(OpTy *V) {
|
||||
if (Class *I = dyn_cast<Class>(V))
|
||||
if (L.match(I->getOperand(0)) && R.match(I->getOperand(1))) {
|
||||
Opcode = I->getOpcode();
|
||||
return true;
|
||||
}
|
||||
#if 0 // Doesn't handle constantexprs yet!
|
||||
if (ConstantExpr *CE = dyn_cast<ConstantExpr>(V))
|
||||
return CE->getOpcode() == Opcode && L.match(CE->getOperand(0)) &&
|
||||
R.match(CE->getOperand(1));
|
||||
#endif
|
||||
return false;
|
||||
}
|
||||
};
|
||||
|
||||
template<typename LHS, typename RHS>
|
||||
inline BinaryOpClass_match<LHS, RHS, SetCondInst>
|
||||
m_SetCond(Instruction::BinaryOps &Op, const LHS &L, const RHS &R) {
|
||||
return BinaryOpClass_match<LHS, RHS, SetCondInst>(Op, L, R);
|
||||
}
|
||||
|
||||
|
||||
//===----------------------------------------------------------------------===//
|
||||
// Matchers for unary operators
|
||||
//
|
||||
|
||||
template<typename LHS_t>
|
||||
struct neg_match {
|
||||
LHS_t L;
|
||||
|
||||
neg_match(const LHS_t &LHS) : L(LHS) {}
|
||||
|
||||
template<typename OpTy>
|
||||
bool match(OpTy *V) {
|
||||
if (Instruction *I = dyn_cast<Instruction>(V))
|
||||
if (I->getOpcode() == Instruction::Sub)
|
||||
return matchIfNeg(I->getOperand(0), I->getOperand(1));
|
||||
if (ConstantExpr *CE = dyn_cast<ConstantExpr>(V))
|
||||
if (CE->getOpcode() == Instruction::Sub)
|
||||
return matchIfNeg(I->getOperand(0), I->getOperand(1));
|
||||
if (ConstantInt *CI = dyn_cast<ConstantInt>(V))
|
||||
return L.match(ConstantExpr::getNeg(CI));
|
||||
return false;
|
||||
}
|
||||
private:
|
||||
bool matchIfNeg(Value *LHS, Value *RHS) {
|
||||
if (!LHS->getType()->isFloatingPoint())
|
||||
return LHS == Constant::getNullValue(LHS->getType()) && L.match(RHS);
|
||||
else
|
||||
return LHS == ConstantFP::get(Bop->getType(), -0.0) && L.match(RHS);
|
||||
}
|
||||
};
|
||||
|
||||
template<typename LHS>
|
||||
inline neg_match<LHS> m_Neg(const LHS &L) { return L; }
|
||||
|
||||
|
||||
template<typename LHS_t>
|
||||
struct not_match {
|
||||
LHS_t L;
|
||||
|
||||
not_match(const LHS_t &LHS) : L(LHS) {}
|
||||
|
||||
template<typename OpTy>
|
||||
bool match(OpTy *V) {
|
||||
if (Instruction *I = dyn_cast<Instruction>(V))
|
||||
if (I->getOpcode() == Instruction::Xor)
|
||||
return matchIfNot(I->getOperand(0), I->getOperand(1));
|
||||
if (ConstantExpr *CE = dyn_cast<ConstantExpr>(V))
|
||||
if (CE->getOpcode() == Instruction::Xor)
|
||||
return matchIfNot(CE->getOperand(0), CE->getOperand(1));
|
||||
if (ConstantInt *CI = dyn_cast<ConstantInt>(V))
|
||||
return L.match(ConstantExpr::getNot(CI));
|
||||
return false;
|
||||
}
|
||||
private:
|
||||
bool matchIfNot(Value *LHS, Value *RHS) {
|
||||
if (ConstantIntegral *CI = dyn_cast<ConstantIntegral>(RHS))
|
||||
return CI->isAllOnesValue() && L.match(LHS);
|
||||
else if (ConstantIntegral *CI = dyn_cast<ConstantIntegral>(LHS))
|
||||
return CI->isAllOnesValue() && L.match(RHS);
|
||||
return false;
|
||||
}
|
||||
};
|
||||
|
||||
template<typename LHS>
|
||||
inline not_match<LHS> m_Not(const LHS &L) { return L; }
|
||||
|
||||
//===----------------------------------------------------------------------===//
|
||||
// Matchers for control flow
|
||||
//
|
||||
|
||||
template<typename Cond_t>
|
||||
struct brc_match {
|
||||
Cond_t Cond;
|
||||
BasicBlock *&T, *&F;
|
||||
brc_match(const Cond_t &C, BasicBlock *&t, BasicBlock *&f)
|
||||
: Cond(C), T(t), F(f) {
|
||||
}
|
||||
|
||||
template<typename OpTy>
|
||||
bool match(OpTy *V) {
|
||||
if (BranchInst *BI = dyn_cast<BranchInst>(V))
|
||||
if (BI->isConditional()) {
|
||||
if (Cond.match(BI->getCondition())) {
|
||||
T = BI->getSuccessor(0);
|
||||
F = BI->getSuccessor(1);
|
||||
return true;
|
||||
}
|
||||
}
|
||||
return false;
|
||||
}
|
||||
};
|
||||
|
||||
template<typename Cond_t>
|
||||
inline brc_match<Cond_t> m_Br(const Cond_t &C, BasicBlock *&T, BasicBlock *&F){
|
||||
return brc_match<Cond_t>(C, T, F);
|
||||
}
|
||||
|
||||
|
||||
}} // end llvm::match
|
||||
|
||||
|
||||
#endif
|
||||
|
||||
Loading…
x
Reference in New Issue
Block a user