forked from OSchip/llvm-project
74 lines
2.5 KiB
C++
74 lines
2.5 KiB
C++
|
//- WebAssemblyISelDAGToDAG.cpp - A dag to dag inst selector for WebAssembly -//
|
||
|
|
//
|
||
|
|
// The LLVM Compiler Infrastructure
|
||
|
|
//
|
||
|
|
// This file is distributed under the University of Illinois Open Source
|
||
|
|
// License. See LICENSE.TXT for details.
|
||
|
|
//
|
||
|
|
//===----------------------------------------------------------------------===//
|
||
|
|
///
|
||
|
|
/// \file
|
||
|
|
/// \brief This file defines an instruction selector for the WebAssembly target.
|
||
|
|
///
|
||
|
|
//===----------------------------------------------------------------------===//
|
||
|
|
|
||
|
|
#include "WebAssembly.h"
|
||
|
|
#include "MCTargetDesc/WebAssemblyMCTargetDesc.h"
|
||
|
|
#include "WebAssemblyTargetMachine.h"
|
||
|
|
#include "llvm/CodeGen/SelectionDAGISel.h"
|
||
|
|
#include "llvm/IR/Function.h" // To access function attributes.
|
||
|
|
#include "llvm/Support/Debug.h"
|
||
|
|
#include "llvm/Support/MathExtras.h"
|
||
|
|
#include "llvm/Support/raw_ostream.h"
|
||
|
|
using namespace llvm;
|
||
|
|
|
||
|
|
#define DEBUG_TYPE "wasm-isel"
|
||
|
|
|
||
|
|
//===--------------------------------------------------------------------===//
|
||
|
|
/// WebAssembly-specific code to select WebAssembly machine instructions for
|
||
|
|
/// SelectionDAG operations.
|
||
|
|
///
|
||
|
|
namespace {
|
||
|
|
class WebAssemblyDAGToDAGISel final : public SelectionDAGISel {
|
||
|
|
/// Keep a pointer to the WebAssemblySubtarget around so that we can make the
|
||
|
|
/// right decision when generating code for different targets.
|
||
|
|
const WebAssemblySubtarget *Subtarget;
|
||
|
|
|
||
|
|
bool ForCodeSize;
|
||
|
|
|
||
|
|
public:
|
||
|
|
WebAssemblyDAGToDAGISel(WebAssemblyTargetMachine &tm,
|
||
|
|
CodeGenOpt::Level OptLevel)
|
||
|
|
: SelectionDAGISel(tm, OptLevel), Subtarget(nullptr), ForCodeSize(false) {
|
||
|
|
}
|
||
|
|
|
||
|
|
const char *getPassName() const override {
|
||
|
|
return "WebAssembly Instruction Selection";
|
||
|
|
}
|
||
|
|
|
||
|
|
bool runOnMachineFunction(MachineFunction &MF) override {
|
||
|
|
ForCodeSize =
|
||
|
|
MF.getFunction()->hasFnAttribute(Attribute::OptimizeForSize) ||
|
||
|
|
MF.getFunction()->hasFnAttribute(Attribute::MinSize);
|
||
|
|
Subtarget = &MF.getSubtarget<WebAssemblySubtarget>();
|
||
|
|
return SelectionDAGISel::runOnMachineFunction(MF);
|
||
|
|
}
|
||
|
|
|
||
|
|
SDNode *Select(SDNode *Node) override;
|
||
|
|
|
||
|
|
private:
|
||
|
|
// add select functions here...
|
||
|
|
};
|
||
|
|
} // end anonymous namespace
|
||
|
|
|
||
|
|
SDNode *WebAssemblyDAGToDAGISel::Select(SDNode *Node) {
|
||
|
|
llvm_unreachable("TODO: implement Select");
|
||
|
|
}
|
||
|
|
|
||
|
|
/// This pass converts a legalized DAG into a WebAssembly-specific DAG, ready
|
||
|
|
/// for instruction scheduling.
|
||
|
|
FunctionPass *llvm::createWebAssemblyISelDag(WebAssemblyTargetMachine &TM,
|
||
|
|
CodeGenOpt::Level OptLevel) {
|
||
|
|
return new WebAssemblyDAGToDAGISel(TM, OptLevel);
|
||
|
|
}
|