5949f4596e
This aims to lower `memref.alloc` to `emitc.call_opaque “malloc” ` or
`emitc.call_opaque “aligned_alloc” `
From:
```
module{
func.func @allocating() {
%alloc_5 = memref.alloc() : memref<999xi32>
return
}
}
```
To:
```
module {
emitc.include <"stdlib.h">
func.func @allocating() {
%0 = emitc.call_opaque "sizeof"() {args = [i32]} : () -> !emitc.size_t
%1 = "emitc.constant"() <{value = 999 : index}> : () -> index
%2 = emitc.mul %0, %1 : (!emitc.size_t, index) -> !emitc.size_t
%3 = emitc.call_opaque "malloc"(%2) : (!emitc.size_t) -> !emitc.ptr<!emitc.opaque<"void">>
%4 = emitc.cast %3 : !emitc.ptr<!emitc.opaque<"void">> to !emitc.ptr<i32>
return
}
}
```
Which is then translated as:
```
#include <stdlib.h>
void allocating() {
size_t v1 = sizeof(int32_t);
size_t v2 = 999;
size_t v3 = v1 * v2;
void* v4 = malloc(v3);
int32_t* v5 = (int32_t*) v4;
return;
}
```
90 lines
3.1 KiB
C++
90 lines
3.1 KiB
C++
//===- MemRefToEmitC.cpp - MemRef to EmitC conversion ---------------------===//
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//
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// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
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// See https://llvm.org/LICENSE.txt for license information.
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// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
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//
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//===----------------------------------------------------------------------===//
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//
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// This file implements a pass to convert memref ops into emitc ops.
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//
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//===----------------------------------------------------------------------===//
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#include "mlir/Conversion/MemRefToEmitC/MemRefToEmitCPass.h"
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#include "mlir/Conversion/MemRefToEmitC/MemRefToEmitC.h"
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#include "mlir/Dialect/EmitC/IR/EmitC.h"
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#include "mlir/Dialect/MemRef/IR/MemRef.h"
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#include "mlir/IR/Attributes.h"
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#include "mlir/Pass/Pass.h"
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#include "mlir/Transforms/DialectConversion.h"
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namespace mlir {
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#define GEN_PASS_DEF_CONVERTMEMREFTOEMITC
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#include "mlir/Conversion/Passes.h.inc"
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} // namespace mlir
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using namespace mlir;
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namespace {
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struct ConvertMemRefToEmitCPass
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: public impl::ConvertMemRefToEmitCBase<ConvertMemRefToEmitCPass> {
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using Base::Base;
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void runOnOperation() override {
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TypeConverter converter;
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ConvertMemRefToEmitCOptions options;
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options.lowerToCpp = this->lowerToCpp;
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// Fallback for other types.
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converter.addConversion([](Type type) -> std::optional<Type> {
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if (!emitc::isSupportedEmitCType(type))
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return {};
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return type;
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});
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populateMemRefToEmitCTypeConversion(converter);
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RewritePatternSet patterns(&getContext());
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populateMemRefToEmitCConversionPatterns(patterns, converter);
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ConversionTarget target(getContext());
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target.addIllegalDialect<memref::MemRefDialect>();
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target.addLegalDialect<emitc::EmitCDialect>();
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if (failed(applyPartialConversion(getOperation(), target,
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std::move(patterns))))
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return signalPassFailure();
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mlir::ModuleOp module = getOperation();
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module.walk([&](mlir::emitc::CallOpaqueOp callOp) {
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if (callOp.getCallee() != alignedAllocFunctionName &&
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callOp.getCallee() != mallocFunctionName) {
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return mlir::WalkResult::advance();
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}
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for (auto &op : *module.getBody()) {
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emitc::IncludeOp includeOp = llvm::dyn_cast<mlir::emitc::IncludeOp>(op);
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if (!includeOp) {
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continue;
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}
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if (includeOp.getIsStandardInclude() &&
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((options.lowerToCpp &&
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includeOp.getInclude() == cppStandardLibraryHeader) ||
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(!options.lowerToCpp &&
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includeOp.getInclude() == cStandardLibraryHeader))) {
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return mlir::WalkResult::interrupt();
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}
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}
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mlir::OpBuilder builder(module.getBody(), module.getBody()->begin());
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StringAttr includeAttr =
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builder.getStringAttr(options.lowerToCpp ? cppStandardLibraryHeader
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: cStandardLibraryHeader);
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builder.create<mlir::emitc::IncludeOp>(
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module.getLoc(), includeAttr,
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/*is_standard_include=*/builder.getUnitAttr());
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return mlir::WalkResult::interrupt();
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});
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}
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};
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} // namespace
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