mirror of
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410 lines
13 KiB
C++
410 lines
13 KiB
C++
//===-- TargetAsmInfo.cpp - Asm Info ---------------------------------------==//
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//
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// The LLVM Compiler Infrastructure
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//
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// This file is distributed under the University of Illinois Open Source
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// License. See LICENSE.TXT for details.
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//
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//===----------------------------------------------------------------------===//
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//
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// This file defines target asm properties related what form asm statements
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// should take.
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//
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//===----------------------------------------------------------------------===//
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#include "llvm/Constants.h"
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#include "llvm/GlobalVariable.h"
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#include "llvm/Function.h"
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#include "llvm/Module.h"
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#include "llvm/Type.h"
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#include "llvm/Target/TargetAsmInfo.h"
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#include "llvm/Target/TargetOptions.h"
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#include "llvm/Support/Dwarf.h"
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#include <cctype>
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#include <cstring>
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using namespace llvm;
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void TargetAsmInfo::fillDefaultValues() {
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BSSSection = "\t.bss";
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BSSSection_ = 0;
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ReadOnlySection = 0;
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SmallDataSection = 0;
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SmallBSSSection = 0;
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SmallRODataSection = 0;
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TLSDataSection = 0;
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TLSBSSSection = 0;
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ZeroFillDirective = 0;
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NonexecutableStackDirective = 0;
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NeedsSet = false;
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MaxInstLength = 4;
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PCSymbol = "$";
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SeparatorChar = ';';
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CommentString = "#";
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GlobalPrefix = "";
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PrivateGlobalPrefix = ".";
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LessPrivateGlobalPrefix = "";
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JumpTableSpecialLabelPrefix = 0;
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GlobalVarAddrPrefix = "";
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GlobalVarAddrSuffix = "";
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FunctionAddrPrefix = "";
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FunctionAddrSuffix = "";
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PersonalityPrefix = "";
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PersonalitySuffix = "";
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NeedsIndirectEncoding = false;
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InlineAsmStart = "#APP";
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InlineAsmEnd = "#NO_APP";
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AssemblerDialect = 0;
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StringConstantPrefix = ".str";
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ZeroDirective = "\t.zero\t";
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ZeroDirectiveSuffix = 0;
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AsciiDirective = "\t.ascii\t";
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AscizDirective = "\t.asciz\t";
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Data8bitsDirective = "\t.byte\t";
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Data16bitsDirective = "\t.short\t";
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Data32bitsDirective = "\t.long\t";
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Data64bitsDirective = "\t.quad\t";
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AlignDirective = "\t.align\t";
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AlignmentIsInBytes = true;
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TextAlignFillValue = 0;
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SwitchToSectionDirective = "\t.section\t";
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TextSectionStartSuffix = "";
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DataSectionStartSuffix = "";
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SectionEndDirectiveSuffix = 0;
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ConstantPoolSection = "\t.section .rodata";
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JumpTableDataSection = "\t.section .rodata";
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JumpTableDirective = 0;
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CStringSection = 0;
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CStringSection_ = 0;
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// FIXME: Flags are ELFish - replace with normal section stuff.
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StaticCtorsSection = "\t.section .ctors,\"aw\",@progbits";
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StaticDtorsSection = "\t.section .dtors,\"aw\",@progbits";
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GlobalDirective = "\t.globl\t";
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SetDirective = 0;
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LCOMMDirective = 0;
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COMMDirective = "\t.comm\t";
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COMMDirectiveTakesAlignment = true;
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HasDotTypeDotSizeDirective = true;
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HasSingleParameterDotFile = true;
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UsedDirective = 0;
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WeakRefDirective = 0;
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WeakDefDirective = 0;
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// FIXME: These are ELFish - move to ELFTAI.
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HiddenDirective = "\t.hidden\t";
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ProtectedDirective = "\t.protected\t";
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AbsoluteDebugSectionOffsets = false;
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AbsoluteEHSectionOffsets = false;
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HasLEB128 = false;
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HasDotLocAndDotFile = false;
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SupportsDebugInformation = false;
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SupportsExceptionHandling = false;
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DwarfRequiresFrameSection = true;
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FDEEncodingRequiresSData4 = true;
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NonLocalEHFrameLabel = false;
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Force32BitFDEReference = true;
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GlobalEHDirective = 0;
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SupportsWeakOmittedEHFrame = true;
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DwarfSectionOffsetDirective = 0;
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DwarfAbbrevSection = ".debug_abbrev";
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DwarfInfoSection = ".debug_info";
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DwarfLineSection = ".debug_line";
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DwarfFrameSection = ".debug_frame";
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DwarfPubNamesSection = ".debug_pubnames";
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DwarfPubTypesSection = ".debug_pubtypes";
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DwarfStrSection = ".debug_str";
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DwarfLocSection = ".debug_loc";
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DwarfARangesSection = ".debug_aranges";
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DwarfRangesSection = ".debug_ranges";
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DwarfMacInfoSection = ".debug_macinfo";
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DwarfEHFrameSection = ".eh_frame";
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DwarfExceptionSection = ".gcc_except_table";
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AsmTransCBE = 0;
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TextSection = getUnnamedSection("\t.text", SectionFlags::Code);
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DataSection = getUnnamedSection("\t.data", SectionFlags::Writeable);
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}
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TargetAsmInfo::TargetAsmInfo(const TargetMachine &tm)
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: TM(tm) {
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fillDefaultValues();
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}
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TargetAsmInfo::~TargetAsmInfo() {
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}
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/// Measure the specified inline asm to determine an approximation of its
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/// length.
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/// Comments (which run till the next SeparatorChar or newline) do not
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/// count as an instruction.
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/// Any other non-whitespace text is considered an instruction, with
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/// multiple instructions separated by SeparatorChar or newlines.
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/// Variable-length instructions are not handled here; this function
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/// may be overloaded in the target code to do that.
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unsigned TargetAsmInfo::getInlineAsmLength(const char *Str) const {
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// Count the number of instructions in the asm.
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bool atInsnStart = true;
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unsigned Length = 0;
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for (; *Str; ++Str) {
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if (*Str == '\n' || *Str == SeparatorChar)
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atInsnStart = true;
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if (atInsnStart && !isspace(*Str)) {
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Length += MaxInstLength;
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atInsnStart = false;
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}
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if (atInsnStart && strncmp(Str, CommentString, strlen(CommentString))==0)
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atInsnStart = false;
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}
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return Length;
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}
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unsigned TargetAsmInfo::PreferredEHDataFormat(DwarfEncoding::Target Reason,
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bool Global) const {
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return dwarf::DW_EH_PE_absptr;
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}
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static bool isSuitableForBSS(const GlobalVariable *GV) {
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if (!GV->hasInitializer())
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return true;
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// Leave constant zeros in readonly constant sections, so they can be shared
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Constant *C = GV->getInitializer();
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return (C->isNullValue() && !GV->isConstant() && !NoZerosInBSS);
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}
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SectionKind::Kind
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TargetAsmInfo::SectionKindForGlobal(const GlobalValue *GV) const {
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// Early exit - functions should be always in text sections.
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if (isa<Function>(GV))
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return SectionKind::Text;
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const GlobalVariable* GVar = dyn_cast<GlobalVariable>(GV);
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bool isThreadLocal = GVar->isThreadLocal();
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assert(GVar && "Invalid global value for section selection");
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if (isSuitableForBSS(GVar)) {
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// Variable can be easily put to BSS section.
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return (isThreadLocal ? SectionKind::ThreadBSS : SectionKind::BSS);
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} else if (GVar->isConstant() && !isThreadLocal) {
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// Now we know, that varible has initializer and it is constant. We need to
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// check its initializer to decide, which section to output it into. Also
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// note, there is no thread-local r/o section.
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Constant *C = GVar->getInitializer();
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if (C->ContainsRelocations())
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return SectionKind::ROData;
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else {
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const ConstantArray *CVA = dyn_cast<ConstantArray>(C);
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// Check, if initializer is a null-terminated string
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if (CVA && CVA->isCString())
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return SectionKind::RODataMergeStr;
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else
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return SectionKind::RODataMergeConst;
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}
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}
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// Variable is not constant or thread-local - emit to generic data section.
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return (isThreadLocal ? SectionKind::ThreadData : SectionKind::Data);
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}
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unsigned
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TargetAsmInfo::SectionFlagsForGlobal(const GlobalValue *GV,
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const char* Name) const {
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unsigned Flags = SectionFlags::None;
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// Decode flags from global itself.
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if (GV) {
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SectionKind::Kind Kind = SectionKindForGlobal(GV);
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switch (Kind) {
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case SectionKind::Text:
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Flags |= SectionFlags::Code;
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break;
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case SectionKind::ThreadData:
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case SectionKind::ThreadBSS:
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Flags |= SectionFlags::TLS;
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// FALLS THROUGH
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case SectionKind::Data:
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case SectionKind::BSS:
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Flags |= SectionFlags::Writeable;
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break;
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case SectionKind::ROData:
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case SectionKind::RODataMergeStr:
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case SectionKind::RODataMergeConst:
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// No additional flags here
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break;
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case SectionKind::SmallData:
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case SectionKind::SmallBSS:
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Flags |= SectionFlags::Writeable;
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// FALLS THROUGH
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case SectionKind::SmallROData:
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Flags |= SectionFlags::Small;
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break;
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default:
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assert(0 && "Unexpected section kind!");
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}
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if (GV->mayBeOverridden())
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Flags |= SectionFlags::Linkonce;
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}
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// Add flags from sections, if any.
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if (Name && *Name) {
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Flags |= SectionFlags::Named;
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// Some lame default implementation based on some magic section names.
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if (strncmp(Name, ".gnu.linkonce.b.", 16) == 0 ||
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strncmp(Name, ".llvm.linkonce.b.", 17) == 0 ||
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strncmp(Name, ".gnu.linkonce.sb.", 17) == 0 ||
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strncmp(Name, ".llvm.linkonce.sb.", 18) == 0)
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Flags |= SectionFlags::BSS;
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else if (strcmp(Name, ".tdata") == 0 ||
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strncmp(Name, ".tdata.", 7) == 0 ||
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strncmp(Name, ".gnu.linkonce.td.", 17) == 0 ||
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strncmp(Name, ".llvm.linkonce.td.", 18) == 0)
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Flags |= SectionFlags::TLS;
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else if (strcmp(Name, ".tbss") == 0 ||
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strncmp(Name, ".tbss.", 6) == 0 ||
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strncmp(Name, ".gnu.linkonce.tb.", 17) == 0 ||
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strncmp(Name, ".llvm.linkonce.tb.", 18) == 0)
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Flags |= SectionFlags::BSS | SectionFlags::TLS;
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}
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return Flags;
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}
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const Section*
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TargetAsmInfo::SectionForGlobal(const GlobalValue *GV) const {
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const Section* S;
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// Select section name
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if (GV->hasSection()) {
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// Honour section already set, if any
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unsigned Flags = SectionFlagsForGlobal(GV,
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GV->getSection().c_str());
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S = getNamedSection(GV->getSection().c_str(), Flags);
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} else {
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// Use default section depending on the 'type' of global
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S = SelectSectionForGlobal(GV);
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}
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return S;
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}
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// Lame default implementation. Calculate the section name for global.
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const Section*
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TargetAsmInfo::SelectSectionForGlobal(const GlobalValue *GV) const {
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SectionKind::Kind Kind = SectionKindForGlobal(GV);
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if (GV->mayBeOverridden()) {
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std::string Name = UniqueSectionForGlobal(GV, Kind);
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unsigned Flags = SectionFlagsForGlobal(GV, Name.c_str());
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return getNamedSection(Name.c_str(), Flags);
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} else {
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if (Kind == SectionKind::Text)
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return getTextSection();
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else if (isBSS(Kind) && getBSSSection_())
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return getBSSSection_();
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else if (getReadOnlySection() && SectionKind::isReadOnly(Kind))
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return getReadOnlySection();
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}
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return getDataSection();
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}
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// Lame default implementation. Calculate the section name for machine const.
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const Section*
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TargetAsmInfo::SelectSectionForMachineConst(const Type *Ty) const {
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// FIXME: Support data.rel stuff someday
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return getDataSection();
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}
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std::string
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TargetAsmInfo::UniqueSectionForGlobal(const GlobalValue* GV,
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SectionKind::Kind Kind) const {
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switch (Kind) {
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case SectionKind::Text:
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return ".gnu.linkonce.t." + GV->getName();
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case SectionKind::Data:
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return ".gnu.linkonce.d." + GV->getName();
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case SectionKind::SmallData:
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return ".gnu.linkonce.s." + GV->getName();
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case SectionKind::BSS:
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return ".gnu.linkonce.b." + GV->getName();
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case SectionKind::SmallBSS:
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return ".gnu.linkonce.sb." + GV->getName();
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case SectionKind::ROData:
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case SectionKind::RODataMergeConst:
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case SectionKind::RODataMergeStr:
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return ".gnu.linkonce.r." + GV->getName();
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case SectionKind::SmallROData:
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return ".gnu.linkonce.s2." + GV->getName();
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case SectionKind::ThreadData:
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return ".gnu.linkonce.td." + GV->getName();
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case SectionKind::ThreadBSS:
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return ".gnu.linkonce.tb." + GV->getName();
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default:
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assert(0 && "Unknown section kind");
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}
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}
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const Section*
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TargetAsmInfo::getNamedSection(const char *Name, unsigned Flags,
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bool Override) const {
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Section& S = Sections[Name];
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// This is newly-created section, set it up properly.
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if (S.Flags == SectionFlags::Invalid || Override) {
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S.Flags = Flags | SectionFlags::Named;
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S.Name = Name;
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}
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return &S;
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}
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const Section*
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TargetAsmInfo::getUnnamedSection(const char *Directive, unsigned Flags,
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bool Override) const {
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Section& S = Sections[Directive];
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// This is newly-created section, set it up properly.
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if (S.Flags == SectionFlags::Invalid || Override) {
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S.Flags = Flags & ~SectionFlags::Named;
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S.Name = Directive;
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}
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return &S;
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}
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const std::string&
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TargetAsmInfo::getSectionFlags(unsigned Flags) const {
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SectionFlags::FlagsStringsMapType::iterator I = FlagsStrings.find(Flags);
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// We didn't print these flags yet, print and save them to map. This reduces
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// amount of heap trashing due to std::string construction / concatenation.
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if (I == FlagsStrings.end())
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I = FlagsStrings.insert(std::make_pair(Flags,
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printSectionFlags(Flags))).first;
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return I->second;
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}
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unsigned TargetAsmInfo::getULEB128Size(unsigned Value) {
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unsigned Size = 0;
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do {
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Value >>= 7;
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Size += sizeof(int8_t);
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} while (Value);
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return Size;
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}
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unsigned TargetAsmInfo::getSLEB128Size(int Value) {
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unsigned Size = 0;
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int Sign = Value >> (8 * sizeof(Value) - 1);
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bool IsMore;
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do {
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unsigned Byte = Value & 0x7f;
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Value >>= 7;
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IsMore = Value != Sign || ((Byte ^ Sign) & 0x40) != 0;
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Size += sizeof(int8_t);
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} while (IsMore);
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return Size;
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}
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