[llvm] r204178 - Add back r203962, r204028 and r204059.
Alexander Kornienko
alexfh at google.com
Tue Mar 18 16:06:46 PDT 2014
And it again breaks something for us. I assume, it's also related to
aliases, but it will take some time to figure out what exactly.
On Tue, Mar 18, 2014 at 9:40 PM, Rafael Espindola <
rafael.espindola at gmail.com> wrote:
> Author: rafael
> Date: Tue Mar 18 15:40:38 2014
> New Revision: 204178
>
> URL: http://llvm.org/viewvc/llvm-project?rev=204178&view=rev
> Log:
> Add back r203962, r204028 and r204059.
>
> This reverts commit r204137.
>
> This includes a fix for handling aliases of aliases.
>
> Added:
> llvm/trunk/test/MC/ARM/thumb_set-diagnostics.s
> llvm/trunk/test/MC/ARM/thumb_set.s
> llvm/trunk/test/MC/ELF/offset.s
> Modified:
> llvm/trunk/include/llvm/MC/MCSymbol.h
> llvm/trunk/lib/MC/ELFObjectWriter.cpp
> llvm/trunk/lib/MC/MCSymbol.cpp
> llvm/trunk/lib/Target/ARM/AsmParser/ARMAsmParser.cpp
>
> Modified: llvm/trunk/include/llvm/MC/MCSymbol.h
> URL:
> http://llvm.org/viewvc/llvm-project/llvm/trunk/include/llvm/MC/MCSymbol.h?rev=204178&r1=204177&r2=204178&view=diff
>
> ==============================================================================
> --- llvm/trunk/include/llvm/MC/MCSymbol.h (original)
> +++ llvm/trunk/include/llvm/MC/MCSymbol.h Tue Mar 18 15:40:38 2014
> @@ -18,6 +18,7 @@
> #include "llvm/Support/Compiler.h"
>
> namespace llvm {
> + class MCAsmLayout;
> class MCExpr;
> class MCSection;
> class MCContext;
> @@ -145,6 +146,11 @@ namespace llvm {
> // itself.
> const MCSymbol &AliasedSymbol() const;
>
> + // If this symbol is not a variable, return itself. If it is a
> variable,
> + // evaluate it and check if it is of the form Base + ConstantOffset.
> If so,
> + // return Base, if not, return nullptr.
> + const MCSymbol *getBaseSymbol(const MCAsmLayout &Layout) const;
> +
> void setVariableValue(const MCExpr *Value);
>
> /// @}
>
> Modified: llvm/trunk/lib/MC/ELFObjectWriter.cpp
> URL:
> http://llvm.org/viewvc/llvm-project/llvm/trunk/lib/MC/ELFObjectWriter.cpp?rev=204178&r1=204177&r2=204178&view=diff
>
> ==============================================================================
> --- llvm/trunk/lib/MC/ELFObjectWriter.cpp (original)
> +++ llvm/trunk/lib/MC/ELFObjectWriter.cpp Tue Mar 18 15:40:38 2014
> @@ -271,6 +271,7 @@ class ELFObjectWriter : public MCObjectW
> /// \param RevGroupMap - Maps a signature symbol to the group section.
> /// \param NumRegularSections - Number of non-relocation sections.
> void ComputeSymbolTable(MCAssembler &Asm,
> + const MCAsmLayout &Layout,
> const SectionIndexMapTy &SectionIndexMap,
> RevGroupMapTy RevGroupMap,
> unsigned NumRegularSections);
> @@ -462,33 +463,47 @@ void ELFObjectWriter::WriteSymbolEntry(M
> }
> }
>
> -uint64_t ELFObjectWriter::SymbolValue(MCSymbolData &Data,
> +uint64_t ELFObjectWriter::SymbolValue(MCSymbolData &OrigData,
> const MCAsmLayout &Layout) {
> - if (Data.isCommon() && Data.isExternal())
> - return Data.getCommonAlignment();
> -
> - const MCSymbol &Symbol = Data.getSymbol();
> + MCSymbolData *Data = &OrigData;
> + if (Data->isCommon() && Data->isExternal())
> + return Data->getCommonAlignment();
> +
> + const MCSymbol *Symbol = &Data->getSymbol();
> + const bool IsThumbFunc = OrigData.getFlags() & ELF_Other_ThumbFunc;
> +
> + uint64_t Res = 0;
> + if (Symbol->isVariable()) {
> + const MCExpr *Expr = Symbol->getVariableValue();
> + MCValue Value;
> + if (!Expr->EvaluateAsRelocatable(Value, &Layout))
> + return 0;
> + if (Value.getSymB())
> + return 0;
> +
> + Res = Value.getConstant();
> + if (IsThumbFunc)
> + Res |= 1;
> +
> + const MCSymbolRefExpr *A = Value.getSymA();
> + if (!A)
> + return Res;
>
> - if (Symbol.isAbsolute() && Symbol.isVariable()) {
> - if (const MCExpr *Value = Symbol.getVariableValue()) {
> - int64_t IntValue;
> - if (Value->EvaluateAsAbsolute(IntValue, Layout))
> - return (uint64_t)IntValue;
> - }
> + Symbol = &A->getSymbol();
> + Data = &Layout.getAssembler().getSymbolData(*Symbol);
> }
>
> - if (!Symbol.isInSection())
> + if (!Symbol->isInSection())
> return 0;
>
> + if (!Data->getFragment())
> + return 0;
>
> - if (Data.getFragment()) {
> - if (Data.getFlags() & ELF_Other_ThumbFunc)
> - return Layout.getSymbolOffset(&Data)+1;
> - else
> - return Layout.getSymbolOffset(&Data);
> - }
> + Res += Layout.getSymbolOffset(Data);
> + if (IsThumbFunc || Data->getFlags() & ELF_Other_ThumbFunc)
> + Res |= 1;
>
> - return 0;
> + return Res;
> }
>
> void ELFObjectWriter::ExecutePostLayoutBinding(MCAssembler &Asm,
> @@ -569,8 +584,9 @@ void ELFObjectWriter::WriteSymbol(MCData
> ELFSymbolData &MSD,
> const MCAsmLayout &Layout) {
> MCSymbolData &OrigData = *MSD.SymbolData;
> - MCSymbolData &Data =
> -
> Layout.getAssembler().getSymbolData(OrigData.getSymbol().AliasedSymbol());
> + const MCSymbol *Base = OrigData.getSymbol().getBaseSymbol(Layout);
> + const MCSymbolData &Data =
> + Base ? Layout.getAssembler().getSymbolData(*Base) : OrigData;
>
> bool IsReserved = Data.isCommon() || Data.getSymbol().isAbsolute() ||
> Data.getSymbol().isVariable();
> @@ -578,6 +594,8 @@ void ELFObjectWriter::WriteSymbol(MCData
> // Binding and Type share the same byte as upper and lower nibbles
> uint8_t Binding = MCELF::GetBinding(OrigData);
> uint8_t Type = mergeTypeForSet(MCELF::GetType(OrigData),
> MCELF::GetType(Data));
> + if (OrigData.getFlags() & ELF_Other_ThumbFunc)
> + Type = ELF::STT_FUNC;
> uint8_t Info = (Binding << ELF_STB_Shift) | (Type << ELF_STT_Shift);
>
> // Other and Visibility share the same byte with Visibility using the
> lower
> @@ -586,7 +604,7 @@ void ELFObjectWriter::WriteSymbol(MCData
> uint8_t Other = MCELF::getOther(OrigData) << (ELF_STO_Shift -
> ELF_STV_Shift);
> Other |= Visibility;
>
> - uint64_t Value = SymbolValue(Data, Layout);
> + uint64_t Value = SymbolValue(OrigData, Layout);
> uint64_t Size = 0;
>
> assert(!(Data.isCommon() && !Data.isExternal()));
> @@ -897,10 +915,11 @@ void ELFObjectWriter::ComputeIndexMap(MC
> }
> }
>
> -void ELFObjectWriter::ComputeSymbolTable(MCAssembler &Asm,
> - const SectionIndexMapTy
> &SectionIndexMap,
> - RevGroupMapTy RevGroupMap,
> - unsigned NumRegularSections) {
> +void
> +ELFObjectWriter::ComputeSymbolTable(MCAssembler &Asm, const MCAsmLayout
> &Layout,
> + const SectionIndexMapTy
> &SectionIndexMap,
> + RevGroupMapTy RevGroupMap,
> + unsigned NumRegularSections) {
> // FIXME: Is this the correct place to do this?
> // FIXME: Why is an undefined reference to _GLOBAL_OFFSET_TABLE_ needed?
> if (NeedsGOT) {
> @@ -948,33 +967,33 @@ void ELFObjectWriter::ComputeSymbolTable
>
> ELFSymbolData MSD;
> MSD.SymbolData = it;
> - const MCSymbol &RefSymbol = Symbol.AliasedSymbol();
> + const MCSymbol *BaseSymbol = Symbol.getBaseSymbol(Layout);
>
> // Undefined symbols are global, but this is the first place we
> // are able to set it.
> bool Local = isLocal(*it, isSignature, Used);
> if (!Local && MCELF::GetBinding(*it) == ELF::STB_LOCAL) {
> - MCSymbolData &SD = Asm.getSymbolData(RefSymbol);
> + assert(BaseSymbol);
> + MCSymbolData &SD = Asm.getSymbolData(*BaseSymbol);
> MCELF::SetBinding(*it, ELF::STB_GLOBAL);
> MCELF::SetBinding(SD, ELF::STB_GLOBAL);
> }
>
> - if (RefSymbol.isUndefined() && !Used && WeakrefUsed)
> - MCELF::SetBinding(*it, ELF::STB_WEAK);
> -
> - if (it->isCommon()) {
> + if (!BaseSymbol) {
> + MSD.SectionIndex = ELF::SHN_ABS;
> + } else if (it->isCommon()) {
> assert(!Local);
> MSD.SectionIndex = ELF::SHN_COMMON;
> - } else if (Symbol.isAbsolute() || RefSymbol.isVariable()) {
> - MSD.SectionIndex = ELF::SHN_ABS;
> - } else if (RefSymbol.isUndefined()) {
> + } else if (BaseSymbol->isUndefined()) {
> if (isSignature && !Used)
> MSD.SectionIndex = SectionIndexMap.lookup(RevGroupMap[&Symbol]);
> else
> MSD.SectionIndex = ELF::SHN_UNDEF;
> + if (!Used && WeakrefUsed)
> + MCELF::SetBinding(*it, ELF::STB_WEAK);
> } else {
> const MCSectionELF &Section =
> - static_cast<const MCSectionELF&>(RefSymbol.getSection());
> + static_cast<const MCSectionELF&>(BaseSymbol->getSection());
> MSD.SectionIndex = SectionIndexMap.lookup(&Section);
> if (MSD.SectionIndex >= ELF::SHN_LORESERVE)
> NeedsSymtabShndx = true;
> @@ -1560,8 +1579,8 @@ void ELFObjectWriter::WriteObject(MCAsse
> unsigned NumRegularSections = NumUserSections + NumIndexedSections;
>
> // Compute symbol table information.
> - ComputeSymbolTable(Asm, SectionIndexMap, RevGroupMap,
> NumRegularSections);
> -
> + ComputeSymbolTable(Asm, Layout, SectionIndexMap, RevGroupMap,
> + NumRegularSections);
>
> WriteRelocations(Asm, const_cast<MCAsmLayout&>(Layout), RelMap);
>
>
> Modified: llvm/trunk/lib/MC/MCSymbol.cpp
> URL:
> http://llvm.org/viewvc/llvm-project/llvm/trunk/lib/MC/MCSymbol.cpp?rev=204178&r1=204177&r2=204178&view=diff
>
> ==============================================================================
> --- llvm/trunk/lib/MC/MCSymbol.cpp (original)
> +++ llvm/trunk/lib/MC/MCSymbol.cpp Tue Mar 18 15:40:38 2014
> @@ -9,6 +9,7 @@
>
> #include "llvm/MC/MCSymbol.h"
> #include "llvm/MC/MCExpr.h"
> +#include "llvm/MC/MCValue.h"
> #include "llvm/Support/Debug.h"
> #include "llvm/Support/raw_ostream.h"
> using namespace llvm;
> @@ -51,6 +52,27 @@ const MCSymbol &MCSymbol::AliasedSymbol(
> return *S;
> }
>
> +const MCSymbol *MCSymbol::getBaseSymbol(const MCAsmLayout &Layout) const {
> + // FIXME: shouldn't EvaluateAsRelocatable be responsible for following
> as many
> + // variables as possible?
> +
> + const MCSymbol *S = this;
> + while (S->isVariable()) {
> + const MCExpr *Expr = S->getVariableValue();
> + MCValue Value;
> + if (!Expr->EvaluateAsRelocatable(Value, &Layout))
> + return nullptr;
> +
> + if (Value.getSymB())
> + return nullptr;
> + const MCSymbolRefExpr *A = Value.getSymA();
> + if (!A)
> + return nullptr;
> + S = &A->getSymbol();
> + }
> + return S;
> +}
> +
> void MCSymbol::setVariableValue(const MCExpr *Value) {
> assert(!IsUsed && "Cannot set a variable that has already been used.");
> assert(Value && "Invalid variable value!");
>
> Modified: llvm/trunk/lib/Target/ARM/AsmParser/ARMAsmParser.cpp
> URL:
> http://llvm.org/viewvc/llvm-project/llvm/trunk/lib/Target/ARM/AsmParser/ARMAsmParser.cpp?rev=204178&r1=204177&r2=204178&view=diff
>
> ==============================================================================
> --- llvm/trunk/lib/Target/ARM/AsmParser/ARMAsmParser.cpp (original)
> +++ llvm/trunk/lib/Target/ARM/AsmParser/ARMAsmParser.cpp Tue Mar 18
> 15:40:38 2014
> @@ -30,6 +30,7 @@
> #include "llvm/MC/MCInst.h"
> #include "llvm/MC/MCInstrDesc.h"
> #include "llvm/MC/MCInstrInfo.h"
> +#include "llvm/MC/MCObjectFileInfo.h"
> #include "llvm/MC/MCParser/MCAsmLexer.h"
> #include "llvm/MC/MCParser/MCAsmParser.h"
> #include "llvm/MC/MCParser/MCParsedAsmOperand.h"
> @@ -41,6 +42,7 @@
> #include "llvm/MC/MCTargetAsmParser.h"
> #include "llvm/Support/ARMBuildAttributes.h"
> #include "llvm/Support/ARMEHABI.h"
> +#include "llvm/Support/COFF.h"
> #include "llvm/Support/Debug.h"
> #include "llvm/Support/ELF.h"
> #include "llvm/Support/MathExtras.h"
> @@ -229,6 +231,7 @@ class ARMAsmParser : public MCTargetAsmP
> bool parseDirectiveObjectArch(SMLoc L);
> bool parseDirectiveArchExtension(SMLoc L);
> bool parseDirectiveAlign(SMLoc L);
> + bool parseDirectiveThumbSet(SMLoc L);
>
> StringRef splitMnemonic(StringRef Mnemonic, unsigned &PredicationCode,
> bool &CarrySetting, unsigned &ProcessorIMod,
> @@ -8030,6 +8033,8 @@ bool ARMAsmParser::ParseDirective(AsmTok
> return parseDirectiveArchExtension(DirectiveID.getLoc());
> else if (IDVal == ".align")
> return parseDirectiveAlign(DirectiveID.getLoc());
> + else if (IDVal == ".thumb_set")
> + return parseDirectiveThumbSet(DirectiveID.getLoc());
> return true;
> }
>
> @@ -9086,6 +9091,71 @@ bool ARMAsmParser::parseDirectiveAlign(S
>
> return false;
> }
> +
> +/// parseDirectiveThumbSet
> +/// ::= .thumb_set name, value
> +bool ARMAsmParser::parseDirectiveThumbSet(SMLoc L) {
> + StringRef Name;
> + if (Parser.parseIdentifier(Name)) {
> + TokError("expected identifier after '.thumb_set'");
> + Parser.eatToEndOfStatement();
> + return false;
> + }
> +
> + if (getLexer().isNot(AsmToken::Comma)) {
> + TokError("expected comma after name '" + Name + "'");
> + Parser.eatToEndOfStatement();
> + return false;
> + }
> + Lex();
> +
> + const MCExpr *Value;
> + if (Parser.parseExpression(Value)) {
> + TokError("missing expression");
> + Parser.eatToEndOfStatement();
> + return false;
> + }
> +
> + if (getLexer().isNot(AsmToken::EndOfStatement)) {
> + TokError("unexpected token");
> + Parser.eatToEndOfStatement();
> + return false;
> + }
> + Lex();
> +
> + MCSymbol *Alias = getContext().GetOrCreateSymbol(Name);
> + if (const MCSymbolRefExpr *SRE = dyn_cast<MCSymbolRefExpr>(Value)) {
> + MCSymbol *Sym = getContext().LookupSymbol(SRE->getSymbol().getName());
> + if (!Sym->isDefined()) {
> + getStreamer().EmitSymbolAttribute(Sym, MCSA_Global);
> + getStreamer().EmitAssignment(Alias, Value);
> + return false;
> + }
> +
> + const MCObjectFileInfo::Environment Format =
> + getContext().getObjectFileInfo()->getObjectFileType();
> + switch (Format) {
> + case MCObjectFileInfo::IsCOFF: {
> + char Type = COFF::IMAGE_SYM_DTYPE_FUNCTION <<
> COFF::SCT_COMPLEX_TYPE_SHIFT;
> + getStreamer().EmitCOFFSymbolType(Type);
> + // .set values are always local in COFF
> + getStreamer().EmitSymbolAttribute(Alias, MCSA_Local);
> + break;
> + }
> + case MCObjectFileInfo::IsELF:
> + getStreamer().EmitSymbolAttribute(Alias, MCSA_ELF_TypeFunction);
> + break;
> + case MCObjectFileInfo::IsMachO:
> + break;
> + }
> + }
> +
> + // FIXME: set the function as being a thumb function via the assembler
> + getStreamer().EmitThumbFunc(Alias);
> + getStreamer().EmitAssignment(Alias, Value);
> +
> + return false;
> +}
>
> /// Force static initialization.
> extern "C" void LLVMInitializeARMAsmParser() {
>
> Added: llvm/trunk/test/MC/ARM/thumb_set-diagnostics.s
> URL:
> http://llvm.org/viewvc/llvm-project/llvm/trunk/test/MC/ARM/thumb_set-diagnostics.s?rev=204178&view=auto
>
> ==============================================================================
> --- llvm/trunk/test/MC/ARM/thumb_set-diagnostics.s (added)
> +++ llvm/trunk/test/MC/ARM/thumb_set-diagnostics.s Tue Mar 18 15:40:38 2014
> @@ -0,0 +1,43 @@
> +@ RUN: not llvm-mc -triple armv7-eabi -o /dev/null 2>&1 %s | FileCheck %s
> +
> + .syntax unified
> +
> + .thumb
> +
> + .thumb_set
> +
> +@ CHECK: error: expected identifier after '.thumb_set'
> +@ CHECK: .thumb_set
> +@ CHECL: ^
> +
> + .thumb_set ., 0x0b5e55ed
> +
> +@ CHECK: error: expected identifier after '.thumb_set'
> +@ CHECK: .thumb_set ., 0x0b5e55ed
> +@ CHECK: ^
> +
> + .thumb_set labelled, 0x1abe11ed
> + .thumb_set invalid, :lower16:labelled
> +
> +@ CHECK: error: unknown token in expression
> +@ CHECK: .thumb_set invalid, :lower16:labelled
> +@ CHECK: ^
> +
> + .thumb_set missing_comma
> +
> +@ CHECK: error: expected comma after name 'missing_comma'
> +@ CHECK: .thumb_set missing_comma
> +@ CHECK: ^
> +
> + .thumb_set missing_expression,
> +
> +@ CHECK: error: missing expression
> +@ CHECK: .thumb_set missing_expression,
> +@ CHECK: ^
> +
> + .thumb_set trailer_trash, 0x11fe1e55,
> +
> +@ CHECK: error: unexpected token
> +@ CHECK: .thumb_set trailer_trash, 0x11fe1e55,
> +@ CHECK: ^
> +
>
> Added: llvm/trunk/test/MC/ARM/thumb_set.s
> URL:
> http://llvm.org/viewvc/llvm-project/llvm/trunk/test/MC/ARM/thumb_set.s?rev=204178&view=auto
>
> ==============================================================================
> --- llvm/trunk/test/MC/ARM/thumb_set.s (added)
> +++ llvm/trunk/test/MC/ARM/thumb_set.s Tue Mar 18 15:40:38 2014
> @@ -0,0 +1,140 @@
> +@ RUN: llvm-mc -triple armv7-eabi -filetype obj -o - %s | llvm-readobj -t
> \
> +@ RUN: | FileCheck %s
> +
> + .syntax unified
> +
> + .arm
> +
> + .type arm_func,%function
> +arm_func:
> + nop
> +
> + .thumb_set alias_arm_func, arm_func
> +
> + .thumb
> +
> + .type thumb_func,%function
> + .thumb_func
> +thumb_func:
> + nop
> +
> + .thumb_set alias_thumb_func, thumb_func
> +
> + .thumb_set seedless, 0x5eed1e55
> + .thumb_set eggsalad, seedless + 0x87788358
> + .thumb_set faceless, ~eggsalad + 0xe133c002
> +
> + .thumb_set alias_undefined_data, badblood
> +
> + .data
> +
> + .type badblood,%object
> +badblood:
> + .long 0xbadb100d
> +
> + .type bedazzle,%object
> +bedazzle:
> + .long 0xbeda221e
> +
> + .text
> + .thumb
> +
> + .thumb_set alias_defined_data, bedazzle
> +
> + .type alpha,%function
> +alpha:
> + nop
> +
> + .type beta,%function
> +beta:
> + bkpt
> +
> + .thumb_set beta, alpha
> +
> + .thumb_set alias_undefined, undefined
> +
> +@ CHECK: Symbol {
> +@ CHECK: Name: alias_arm_func
> +@ CHECK: Value: 0x1
> +@ CHECK: Type: Function
> +@ CHECK: }
> +
> +@ CHECK: Symbol {
> +@ CHECK: Name: alias_defined_data
> +@ CHECK: Value: 0x5
> +@ CHECK: Type: Function
> +@ CHECK: }
> +
> +@ CHECK: Symbol {
> +@ CHECK: Name: alias_thumb_func
> +@ CHECK: Value: 0x5
> +@ CHECK: Type: Function
> +@ CHECK: }
> +
> +@ CHECK: Symbol {
> +@ CHECK: Name: alias_undefined_data
> +@ CHECK: Value: 0x0
> +@ CHECK: Type: Object
> +@ CHECK: }
> +
> +@ CHECK: Symbol {
> +@ CHECK: Name: alpha
> +@ CHECK: Value: 0x6
> +@ XFAIL-CHECK: Value: 0x7
> +@ CHECK: Type: Function
> +@ CHECK: }
> +
> +@ CHECK: Symbol {
> +@ CHECK: Name: arm_func
> +@ CHECK: Value: 0x0
> +@ CHECK: Type: Function
> +@ CHECK: }
> +
> +@ CHECK: Symbol {
> +@ CHECK: Name: bedazzle
> +@ CHECK: Value: 0x4
> +@ CHECK: Type: Object
> +@ CHECK: }
> +
> +@ CHECK: Symbol {
> +@ CHECK: Name: beta
> +@ CHECK: Value: 0x7
> +@ CHECK: Type: Function
> +@ CHECK: }
> +
> +@ CHECK: Symbol {
> +@ CHECK: Name: eggsalad
> +@ CHECK: Value: 0xE665A1AD
> +@ CHECK: Type: Function
> +@ CHECK: }
> +
> +@ CHECK: Symbol {
> +@ CHECK: Name: faceless
> +@ CHECK: Value: 0xFACE1E55
> +@ CHECK: Type: Function
> +@ CHECK: }
> +
> +@ CHECK: Symbol {
> +@ CHECK: Name: seedless
> +@ CHECK: Value: 0x5EED1E55
> +@ CHECK: Type: Function
> +@ CHECK: }
> +
> +@ CHECK: Symbol {
> +@ CHECK: Name: thumb_func
> +@ CHECK: Value: 0x5
> +@ CHECK: Type: Function
> +@ CHECK: }
> +
> +@ CHECK: Symbol {
> +@ CHECK: Name: badblood
> +@ CHECK: Value: 0x0
> +@ CHECK: Type: Object
> +@ CHECK: }
> +
> +@ CHECK: Symbol {
> +@ CHECK: Name: undefined
> +@ CHECK: Value: 0x0
> +@ CHECK: Type: None
> +@ CHECK: }
> +
>
> Added: llvm/trunk/test/MC/ELF/offset.s
> URL:
> http://llvm.org/viewvc/llvm-project/llvm/trunk/test/MC/ELF/offset.s?rev=204178&view=auto
>
> ==============================================================================
> --- llvm/trunk/test/MC/ELF/offset.s (added)
> +++ llvm/trunk/test/MC/ELF/offset.s Tue Mar 18 15:40:38 2014
> @@ -0,0 +1,72 @@
> +// RUN: llvm-mc -filetype=obj -triple x86_64-pc-linux-gnu %s -o - |
> llvm-readobj -t - | FileCheck %s
> +
> +// Test that a variable declared with "var = other_var + cst" is in the
> same
> +// section as other_var and its value is the value of other_var + cst.
> +
> + .data
> + .globl sym_a
> + .byte 42
> + .type sym_a, @object
> +sym_a:
> +
> +// CHECK: Symbol {
> +// CHECK: Name: sym_a
> +// CHECK-NEXT: Value: 0x1
> +// CHECK-NEXT: Size: 0
> +// CHECK-NEXT: Binding: Global
> +// CHECK-NEXT: Type: Object
> +// CHECK-NEXT: Other: 0
> +// CHECK-NEXT: Section: .data
> +// CHECK-NEXT: }
> +
> + .long 42
> + .globl sym_b
> +sym_b:
> + .globl sym_c
> +sym_c = sym_a
> +// CHECK: Symbol {
> +// CHECK: Name: sym_c
> +// CHECK-NEXT: Value: 0x1
> +// CHECK-NEXT: Size: 0
> +// CHECK-NEXT: Binding: Global
> +// CHECK-NEXT: Type: Object
> +// CHECK-NEXT: Other: 0
> +// CHECK-NEXT: Section: .data
> +// CHECK-NEXT: }
> +
> + .globl sym_d
> +sym_d = sym_a + 1
> +// CHECK: Symbol {
> +// CHECK: Name: sym_d
> +// CHECK-NEXT: Value: 0x2
> +// CHECK-NEXT: Size: 0
> +// CHECK-NEXT: Binding: Global
> +// CHECK-NEXT: Type: Object
> +// CHECK-NEXT: Other: 0
> +// CHECK-NEXT: Section: .data
> +// CHECK-NEXT: }
> +
> + .globl sym_e
> +sym_e = sym_a + (sym_b - sym_a) * 3
> +// CHECK: Symbol {
> +// CHECK: Name: sym_e
> +// CHECK-NEXT: Value: 0xD
> +// CHECK-NEXT: Size: 0
> +// CHECK-NEXT: Binding: Global
> +// CHECK-NEXT: Type: Object
> +// CHECK-NEXT: Other: 0
> +// CHECK-NEXT: Section: .data
> +// CHECK-NEXT: }
> +
> +
> + .globl sym_f
> +sym_f = sym_a + (1 - 1)
> +// CHECK: Symbol {
> +// CHECK: Name: sym_f
> +// CHECK-NEXT: Value: 0x1
> +// CHECK-NEXT: Size: 0
> +// CHECK-NEXT: Binding: Global
> +// CHECK-NEXT: Type: Object
> +// CHECK-NEXT: Other: 0
> +// CHECK-NEXT: Section: .data
> +// CHECK-NEXT: }
>
>
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