462 lines
17 KiB
C++
462 lines
17 KiB
C++
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//===-- HexagonTargetObjectFile.cpp ---------------------------------------===//
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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 contains the declarations of the HexagonTargetAsmInfo properties.
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//
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//===----------------------------------------------------------------------===//
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#define DEBUG_TYPE "hexagon-sdata"
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#include "HexagonTargetObjectFile.h"
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#include "llvm/ADT/SmallString.h"
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#include "llvm/ADT/StringRef.h"
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#include "llvm/ADT/Twine.h"
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#include "llvm/BinaryFormat/ELF.h"
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#include "llvm/IR/DataLayout.h"
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#include "llvm/IR/DerivedTypes.h"
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#include "llvm/IR/GlobalObject.h"
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#include "llvm/IR/GlobalValue.h"
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#include "llvm/IR/GlobalVariable.h"
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#include "llvm/IR/Module.h"
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#include "llvm/IR/Type.h"
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#include "llvm/MC/MCContext.h"
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#include "llvm/MC/SectionKind.h"
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#include "llvm/Support/Casting.h"
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#include "llvm/Support/CommandLine.h"
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#include "llvm/Support/Debug.h"
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#include "llvm/Support/raw_ostream.h"
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#include "llvm/Target/TargetMachine.h"
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using namespace llvm;
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static cl::opt<unsigned> SmallDataThreshold("hexagon-small-data-threshold",
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cl::init(8), cl::Hidden,
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cl::desc("The maximum size of an object in the sdata section"));
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static cl::opt<bool> NoSmallDataSorting("mno-sort-sda", cl::init(false),
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cl::Hidden, cl::desc("Disable small data sections sorting"));
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static cl::opt<bool> StaticsInSData("hexagon-statics-in-small-data",
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cl::init(false), cl::Hidden, cl::ZeroOrMore,
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cl::desc("Allow static variables in .sdata"));
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static cl::opt<bool> TraceGVPlacement("trace-gv-placement",
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cl::Hidden, cl::init(false),
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cl::desc("Trace global value placement"));
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static cl::opt<bool>
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EmitJtInText("hexagon-emit-jt-text", cl::Hidden, cl::init(false),
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cl::desc("Emit hexagon jump tables in function section"));
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static cl::opt<bool>
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EmitLutInText("hexagon-emit-lut-text", cl::Hidden, cl::init(false),
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cl::desc("Emit hexagon lookup tables in function section"));
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// TraceGVPlacement controls messages for all builds. For builds with assertions
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// (debug or release), messages are also controlled by the usual debug flags
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// (e.g. -debug and -debug-only=globallayout)
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#define TRACE_TO(s, X) s << X
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#ifdef NDEBUG
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#define TRACE(X) \
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do { \
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if (TraceGVPlacement) { \
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TRACE_TO(errs(), X); \
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} \
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} while (false)
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#else
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#define TRACE(X) \
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do { \
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if (TraceGVPlacement) { \
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TRACE_TO(errs(), X); \
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} else { \
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LLVM_DEBUG(TRACE_TO(dbgs(), X)); \
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} \
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} while (false)
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#endif
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// Returns true if the section name is such that the symbol will be put
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// in a small data section.
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// For instance, global variables with section attributes such as ".sdata"
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// ".sdata.*", ".sbss", and ".sbss.*" will go into small data.
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static bool isSmallDataSection(StringRef Sec) {
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// sectionName is either ".sdata" or ".sbss". Looking for an exact match
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// obviates the need for checks for section names such as ".sdatafoo".
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if (Sec.equals(".sdata") || Sec.equals(".sbss") || Sec.equals(".scommon"))
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return true;
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// If either ".sdata." or ".sbss." is a substring of the section name
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// then put the symbol in small data.
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return Sec.find(".sdata.") != StringRef::npos ||
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Sec.find(".sbss.") != StringRef::npos ||
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Sec.find(".scommon.") != StringRef::npos;
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}
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static const char *getSectionSuffixForSize(unsigned Size) {
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switch (Size) {
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default:
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return "";
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case 1:
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return ".1";
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case 2:
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return ".2";
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case 4:
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return ".4";
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case 8:
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return ".8";
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}
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}
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void HexagonTargetObjectFile::Initialize(MCContext &Ctx,
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const TargetMachine &TM) {
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TargetLoweringObjectFileELF::Initialize(Ctx, TM);
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SmallDataSection =
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getContext().getELFSection(".sdata", ELF::SHT_PROGBITS,
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ELF::SHF_WRITE | ELF::SHF_ALLOC |
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ELF::SHF_HEX_GPREL);
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SmallBSSSection =
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getContext().getELFSection(".sbss", ELF::SHT_NOBITS,
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ELF::SHF_WRITE | ELF::SHF_ALLOC |
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ELF::SHF_HEX_GPREL);
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}
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MCSection *HexagonTargetObjectFile::SelectSectionForGlobal(
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const GlobalObject *GO, SectionKind Kind, const TargetMachine &TM) const {
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TRACE("[SelectSectionForGlobal] GO(" << GO->getName() << ") ");
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TRACE("input section(" << GO->getSection() << ") ");
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TRACE((GO->hasPrivateLinkage() ? "private_linkage " : "")
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<< (GO->hasLocalLinkage() ? "local_linkage " : "")
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<< (GO->hasInternalLinkage() ? "internal " : "")
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<< (GO->hasExternalLinkage() ? "external " : "")
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<< (GO->hasCommonLinkage() ? "common_linkage " : "")
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<< (GO->hasCommonLinkage() ? "common " : "" )
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<< (Kind.isCommon() ? "kind_common " : "" )
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<< (Kind.isBSS() ? "kind_bss " : "" )
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<< (Kind.isBSSLocal() ? "kind_bss_local " : "" ));
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// If the lookup table is used by more than one function, do not place
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// it in text section.
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if (EmitLutInText && GO->getName().startswith("switch.table")) {
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if (const Function *Fn = getLutUsedFunction(GO))
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return selectSectionForLookupTable(GO, TM, Fn);
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}
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if (isGlobalInSmallSection(GO, TM))
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return selectSmallSectionForGlobal(GO, Kind, TM);
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if (Kind.isCommon()) {
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// This is purely for LTO+Linker Script because commons don't really have a
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// section. However, the BitcodeSectionWriter pass will query for the
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// sections of commons (and the linker expects us to know their section) so
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// we'll return one here.
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return BSSSection;
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}
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TRACE("default_ELF_section\n");
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// Otherwise, we work the same as ELF.
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return TargetLoweringObjectFileELF::SelectSectionForGlobal(GO, Kind, TM);
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}
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MCSection *HexagonTargetObjectFile::getExplicitSectionGlobal(
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const GlobalObject *GO, SectionKind Kind, const TargetMachine &TM) const {
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TRACE("[getExplicitSectionGlobal] GO(" << GO->getName() << ") from("
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<< GO->getSection() << ") ");
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TRACE((GO->hasPrivateLinkage() ? "private_linkage " : "")
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<< (GO->hasLocalLinkage() ? "local_linkage " : "")
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<< (GO->hasInternalLinkage() ? "internal " : "")
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<< (GO->hasExternalLinkage() ? "external " : "")
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<< (GO->hasCommonLinkage() ? "common_linkage " : "")
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<< (GO->hasCommonLinkage() ? "common " : "" )
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<< (Kind.isCommon() ? "kind_common " : "" )
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<< (Kind.isBSS() ? "kind_bss " : "" )
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<< (Kind.isBSSLocal() ? "kind_bss_local " : "" ));
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if (GO->hasSection()) {
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StringRef Section = GO->getSection();
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if (Section.find(".access.text.group") != StringRef::npos)
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return getContext().getELFSection(GO->getSection(), ELF::SHT_PROGBITS,
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ELF::SHF_ALLOC | ELF::SHF_EXECINSTR);
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if (Section.find(".access.data.group") != StringRef::npos)
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return getContext().getELFSection(GO->getSection(), ELF::SHT_PROGBITS,
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ELF::SHF_WRITE | ELF::SHF_ALLOC);
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}
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if (isGlobalInSmallSection(GO, TM))
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return selectSmallSectionForGlobal(GO, Kind, TM);
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// Otherwise, we work the same as ELF.
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TRACE("default_ELF_section\n");
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return TargetLoweringObjectFileELF::getExplicitSectionGlobal(GO, Kind, TM);
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}
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/// Return true if this global value should be placed into small data/bss
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/// section.
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bool HexagonTargetObjectFile::isGlobalInSmallSection(const GlobalObject *GO,
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const TargetMachine &TM) const {
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bool HaveSData = isSmallDataEnabled(TM);
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if (!HaveSData)
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LLVM_DEBUG(dbgs() << "Small-data allocation is disabled, but symbols "
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"may have explicit section assignments...\n");
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// Only global variables, not functions.
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LLVM_DEBUG(dbgs() << "Checking if value is in small-data, -G"
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<< SmallDataThreshold << ": \"" << GO->getName() << "\": ");
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const GlobalVariable *GVar = dyn_cast<GlobalVariable>(GO);
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if (!GVar) {
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LLVM_DEBUG(dbgs() << "no, not a global variable\n");
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return false;
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}
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// Globals with external linkage that have an original section set must be
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// emitted to that section, regardless of whether we would put them into
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// small data or not. This is how we can support mixing -G0/-G8 in LTO.
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if (GVar->hasSection()) {
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bool IsSmall = isSmallDataSection(GVar->getSection());
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LLVM_DEBUG(dbgs() << (IsSmall ? "yes" : "no")
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<< ", has section: " << GVar->getSection() << '\n');
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return IsSmall;
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}
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// If sdata is disabled, stop the checks here.
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if (!HaveSData) {
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LLVM_DEBUG(dbgs() << "no, small-data allocation is disabled\n");
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return false;
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}
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if (GVar->isConstant()) {
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LLVM_DEBUG(dbgs() << "no, is a constant\n");
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return false;
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}
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bool IsLocal = GVar->hasLocalLinkage();
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if (!StaticsInSData && IsLocal) {
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LLVM_DEBUG(dbgs() << "no, is static\n");
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return false;
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}
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Type *GType = GVar->getValueType();
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if (isa<ArrayType>(GType)) {
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LLVM_DEBUG(dbgs() << "no, is an array\n");
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return false;
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}
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// If the type is a struct with no body provided, treat is conservatively.
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// There cannot be actual definitions of object of such a type in this CU
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// (only references), so assuming that they are not in sdata is safe. If
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// these objects end up in the sdata, the references will still be valid.
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if (StructType *ST = dyn_cast<StructType>(GType)) {
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if (ST->isOpaque()) {
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LLVM_DEBUG(dbgs() << "no, has opaque type\n");
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return false;
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}
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}
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unsigned Size = GVar->getParent()->getDataLayout().getTypeAllocSize(GType);
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if (Size == 0) {
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LLVM_DEBUG(dbgs() << "no, has size 0\n");
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return false;
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}
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if (Size > SmallDataThreshold) {
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LLVM_DEBUG(dbgs() << "no, size exceeds sdata threshold: " << Size << '\n');
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return false;
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}
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LLVM_DEBUG(dbgs() << "yes\n");
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return true;
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}
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bool HexagonTargetObjectFile::isSmallDataEnabled(const TargetMachine &TM)
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const {
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return SmallDataThreshold > 0 && !TM.isPositionIndependent();
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}
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unsigned HexagonTargetObjectFile::getSmallDataSize() const {
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return SmallDataThreshold;
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}
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bool HexagonTargetObjectFile::shouldPutJumpTableInFunctionSection(
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bool UsesLabelDifference, const Function &F) const {
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return EmitJtInText;
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}
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/// Descends any type down to "elementary" components,
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/// discovering the smallest addressable one.
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/// If zero is returned, declaration will not be modified.
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unsigned HexagonTargetObjectFile::getSmallestAddressableSize(const Type *Ty,
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const GlobalValue *GV, const TargetMachine &TM) const {
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// Assign the smallest element access size to the highest
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// value which assembler can handle.
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unsigned SmallestElement = 8;
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if (!Ty)
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return 0;
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switch (Ty->getTypeID()) {
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case Type::StructTyID: {
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const StructType *STy = cast<const StructType>(Ty);
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for (auto &E : STy->elements()) {
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unsigned AtomicSize = getSmallestAddressableSize(E, GV, TM);
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if (AtomicSize < SmallestElement)
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SmallestElement = AtomicSize;
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}
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return (STy->getNumElements() == 0) ? 0 : SmallestElement;
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}
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case Type::ArrayTyID: {
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const ArrayType *ATy = cast<const ArrayType>(Ty);
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return getSmallestAddressableSize(ATy->getElementType(), GV, TM);
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}
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case Type::FixedVectorTyID:
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case Type::ScalableVectorTyID: {
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const VectorType *PTy = cast<const VectorType>(Ty);
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return getSmallestAddressableSize(PTy->getElementType(), GV, TM);
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}
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case Type::PointerTyID:
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case Type::HalfTyID:
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case Type::FloatTyID:
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case Type::DoubleTyID:
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case Type::IntegerTyID: {
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const DataLayout &DL = GV->getParent()->getDataLayout();
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// It is unfortunate that DL's function take non-const Type*.
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return DL.getTypeAllocSize(const_cast<Type*>(Ty));
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}
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case Type::FunctionTyID:
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case Type::VoidTyID:
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case Type::BFloatTyID:
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case Type::X86_FP80TyID:
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case Type::FP128TyID:
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case Type::PPC_FP128TyID:
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case Type::LabelTyID:
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case Type::MetadataTyID:
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case Type::X86_MMXTyID:
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case Type::X86_AMXTyID:
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case Type::TokenTyID:
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return 0;
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}
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return 0;
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}
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MCSection *HexagonTargetObjectFile::selectSmallSectionForGlobal(
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const GlobalObject *GO, SectionKind Kind, const TargetMachine &TM) const {
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const Type *GTy = GO->getValueType();
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unsigned Size = getSmallestAddressableSize(GTy, GO, TM);
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// If we have -ffunction-section or -fdata-section then we should emit the
|
||
|
|
// global value to a unique section specifically for it... even for sdata.
|
||
|
|
bool EmitUniquedSection = TM.getDataSections();
|
||
|
|
|
||
|
|
TRACE("Small data. Size(" << Size << ")");
|
||
|
|
// Handle Small Section classification here.
|
||
|
|
if (Kind.isBSS() || Kind.isBSSLocal()) {
|
||
|
|
// If -mno-sort-sda is not set, find out smallest accessible entity in
|
||
|
|
// declaration and add it to the section name string.
|
||
|
|
// Note. It does not track the actual usage of the value, only its de-
|
||
|
|
// claration. Also, compiler adds explicit pad fields to some struct
|
||
|
|
// declarations - they are currently counted towards smallest addres-
|
||
|
|
// sable entity.
|
||
|
|
if (NoSmallDataSorting) {
|
||
|
|
TRACE(" default sbss\n");
|
||
|
|
return SmallBSSSection;
|
||
|
|
}
|
||
|
|
|
||
|
|
StringRef Prefix(".sbss");
|
||
|
|
SmallString<128> Name(Prefix);
|
||
|
|
Name.append(getSectionSuffixForSize(Size));
|
||
|
|
|
||
|
|
if (EmitUniquedSection) {
|
||
|
|
Name.append(".");
|
||
|
|
Name.append(GO->getName());
|
||
|
|
}
|
||
|
|
TRACE(" unique sbss(" << Name << ")\n");
|
||
|
|
return getContext().getELFSection(Name.str(), ELF::SHT_NOBITS,
|
||
|
|
ELF::SHF_WRITE | ELF::SHF_ALLOC | ELF::SHF_HEX_GPREL);
|
||
|
|
}
|
||
|
|
|
||
|
|
if (Kind.isCommon()) {
|
||
|
|
// This is purely for LTO+Linker Script because commons don't really have a
|
||
|
|
// section. However, the BitcodeSectionWriter pass will query for the
|
||
|
|
// sections of commons (and the linker expects us to know their section) so
|
||
|
|
// we'll return one here.
|
||
|
|
if (NoSmallDataSorting)
|
||
|
|
return BSSSection;
|
||
|
|
|
||
|
|
Twine Name = Twine(".scommon") + getSectionSuffixForSize(Size);
|
||
|
|
TRACE(" small COMMON (" << Name << ")\n");
|
||
|
|
|
||
|
|
return getContext().getELFSection(Name.str(), ELF::SHT_NOBITS,
|
||
|
|
ELF::SHF_WRITE | ELF::SHF_ALLOC |
|
||
|
|
ELF::SHF_HEX_GPREL);
|
||
|
|
}
|
||
|
|
|
||
|
|
// We could have changed sdata object to a constant... in this
|
||
|
|
// case the Kind could be wrong for it.
|
||
|
|
if (Kind.isMergeableConst()) {
|
||
|
|
TRACE(" const_object_as_data ");
|
||
|
|
const GlobalVariable *GVar = dyn_cast<GlobalVariable>(GO);
|
||
|
|
if (GVar->hasSection() && isSmallDataSection(GVar->getSection()))
|
||
|
|
Kind = SectionKind::getData();
|
||
|
|
}
|
||
|
|
|
||
|
|
if (Kind.isData()) {
|
||
|
|
if (NoSmallDataSorting) {
|
||
|
|
TRACE(" default sdata\n");
|
||
|
|
return SmallDataSection;
|
||
|
|
}
|
||
|
|
|
||
|
|
StringRef Prefix(".sdata");
|
||
|
|
SmallString<128> Name(Prefix);
|
||
|
|
Name.append(getSectionSuffixForSize(Size));
|
||
|
|
|
||
|
|
if (EmitUniquedSection) {
|
||
|
|
Name.append(".");
|
||
|
|
Name.append(GO->getName());
|
||
|
|
}
|
||
|
|
TRACE(" unique sdata(" << Name << ")\n");
|
||
|
|
return getContext().getELFSection(Name.str(), ELF::SHT_PROGBITS,
|
||
|
|
ELF::SHF_WRITE | ELF::SHF_ALLOC | ELF::SHF_HEX_GPREL);
|
||
|
|
}
|
||
|
|
|
||
|
|
TRACE("default ELF section\n");
|
||
|
|
// Otherwise, we work the same as ELF.
|
||
|
|
return TargetLoweringObjectFileELF::SelectSectionForGlobal(GO, Kind, TM);
|
||
|
|
}
|
||
|
|
|
||
|
|
// Return the function that uses the lookup table. If there are more
|
||
|
|
// than one live function that uses this look table, bail out and place
|
||
|
|
// the lookup table in default section.
|
||
|
|
const Function *
|
||
|
|
HexagonTargetObjectFile::getLutUsedFunction(const GlobalObject *GO) const {
|
||
|
|
const Function *ReturnFn = nullptr;
|
||
|
|
for (auto U : GO->users()) {
|
||
|
|
// validate each instance of user to be a live function.
|
||
|
|
auto *I = dyn_cast<Instruction>(U);
|
||
|
|
if (!I)
|
||
|
|
continue;
|
||
|
|
auto *Bb = I->getParent();
|
||
|
|
if (!Bb)
|
||
|
|
continue;
|
||
|
|
auto *UserFn = Bb->getParent();
|
||
|
|
if (!ReturnFn)
|
||
|
|
ReturnFn = UserFn;
|
||
|
|
else if (ReturnFn != UserFn)
|
||
|
|
return nullptr;
|
||
|
|
}
|
||
|
|
return ReturnFn;
|
||
|
|
}
|
||
|
|
|
||
|
|
MCSection *HexagonTargetObjectFile::selectSectionForLookupTable(
|
||
|
|
const GlobalObject *GO, const TargetMachine &TM, const Function *Fn) const {
|
||
|
|
|
||
|
|
SectionKind Kind = SectionKind::getText();
|
||
|
|
// If the function has explicit section, place the lookup table in this
|
||
|
|
// explicit section.
|
||
|
|
if (Fn->hasSection())
|
||
|
|
return getExplicitSectionGlobal(Fn, Kind, TM);
|
||
|
|
|
||
|
|
const auto *FuncObj = dyn_cast<GlobalObject>(Fn);
|
||
|
|
return SelectSectionForGlobal(FuncObj, Kind, TM);
|
||
|
|
}
|