blob: 518ef332a6c754dc8ec438734ec73ea382e8af36 (
plain) (
blame)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
|
//- 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);
}
|
