bb3f5e1fed
Following discussions in #110443, and the following earlier discussions in https://lists.llvm.org/pipermail/llvm-dev/2017-October/117907.html, https://reviews.llvm.org/D38482, https://reviews.llvm.org/D38489, this PR attempts to overhaul the `TargetMachine` and `LLVMTargetMachine` interface classes. More specifically: 1. Makes `TargetMachine` the only class implemented under `TargetMachine.h` in the `Target` library. 2. `TargetMachine` contains target-specific interface functions that relate to IR/CodeGen/MC constructs, whereas before (at least on paper) it was supposed to have only IR/MC constructs. Any Target that doesn't want to use the independent code generator simply does not implement them, and returns either `false` or `nullptr`. 3. Renames `LLVMTargetMachine` to `CodeGenCommonTMImpl`. This renaming aims to make the purpose of `LLVMTargetMachine` clearer. Its interface was moved under the CodeGen library, to further emphasis its usage in Targets that use CodeGen directly. 4. Makes `TargetMachine` the only interface used across LLVM and its projects. With these changes, `CodeGenCommonTMImpl` is simply a set of shared function implementations of `TargetMachine`, and CodeGen users don't need to static cast to `LLVMTargetMachine` every time they need a CodeGen-specific feature of the `TargetMachine`. 5. More importantly, does not change any requirements regarding library linking. cc @arsenm @aeubanks
56 lines
2.0 KiB
C++
56 lines
2.0 KiB
C++
//===-- WebAssemblyMCAsmInfo.cpp - WebAssembly asm properties -------------===//
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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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/// \file
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/// This file contains the declarations of the WebAssemblyMCAsmInfo
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/// properties.
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///
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//===----------------------------------------------------------------------===//
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#include "WebAssemblyMCAsmInfo.h"
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#include "WebAssemblyMCTargetDesc.h"
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#include "llvm/TargetParser/Triple.h"
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using namespace llvm;
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#define DEBUG_TYPE "wasm-mc-asm-info"
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WebAssemblyMCAsmInfo::~WebAssemblyMCAsmInfo() = default; // anchor.
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WebAssemblyMCAsmInfo::WebAssemblyMCAsmInfo(const Triple &T,
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const MCTargetOptions &Options) {
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CodePointerSize = CalleeSaveStackSlotSize = T.isArch64Bit() ? 8 : 4;
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// TODO: What should MaxInstLength be?
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UseDataRegionDirectives = true;
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// Use .skip instead of .zero because .zero is confusing when used with two
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// arguments (it doesn't actually zero things out).
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ZeroDirective = "\t.skip\t";
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Data8bitsDirective = "\t.int8\t";
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Data16bitsDirective = "\t.int16\t";
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Data32bitsDirective = "\t.int32\t";
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Data64bitsDirective = "\t.int64\t";
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AlignmentIsInBytes = false;
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COMMDirectiveAlignmentIsInBytes = false;
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LCOMMDirectiveAlignmentType = LCOMM::Log2Alignment;
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SupportsDebugInformation = true;
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// When compilation is done on a cpp file by clang, the exception model info
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// is stored in LangOptions, which is later used to set the info in
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// TargetOptions and then MCAsmInfo in CodeGenTargetMachine::initAsmInfo().
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// But this process does not happen when compiling bitcode directly with
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// clang, so we make sure this info is set correctly.
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if (WebAssembly::WasmEnableEH || WebAssembly::WasmEnableSjLj)
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ExceptionsType = ExceptionHandling::Wasm;
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}
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