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MC: Add .section directive to COFF
Supports GAS flags "abdnrswxy". No support for alignment or subsections. Fixes PR16366. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@185669 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Nico Rieck
parent
e7006bb04b
commit
a6d343a688
@ -35,6 +35,9 @@ class COFFAsmParser : public MCAsmParserExtension {
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unsigned Characteristics,
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unsigned Characteristics,
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SectionKind Kind);
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SectionKind Kind);
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bool ParseSectionName(StringRef &SectionName);
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bool ParseSectionFlags(StringRef FlagsString, unsigned* Flags);
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virtual void Initialize(MCAsmParser &Parser) {
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virtual void Initialize(MCAsmParser &Parser) {
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// Call the base implementation.
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// Call the base implementation.
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MCAsmParserExtension::Initialize(Parser);
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MCAsmParserExtension::Initialize(Parser);
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@ -42,6 +45,7 @@ class COFFAsmParser : public MCAsmParserExtension {
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addDirectiveHandler<&COFFAsmParser::ParseSectionDirectiveText>(".text");
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addDirectiveHandler<&COFFAsmParser::ParseSectionDirectiveText>(".text");
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addDirectiveHandler<&COFFAsmParser::ParseSectionDirectiveData>(".data");
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addDirectiveHandler<&COFFAsmParser::ParseSectionDirectiveData>(".data");
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addDirectiveHandler<&COFFAsmParser::ParseSectionDirectiveBSS>(".bss");
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addDirectiveHandler<&COFFAsmParser::ParseSectionDirectiveBSS>(".bss");
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addDirectiveHandler<&COFFAsmParser::ParseDirectiveSection>(".section");
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addDirectiveHandler<&COFFAsmParser::ParseDirectiveDef>(".def");
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addDirectiveHandler<&COFFAsmParser::ParseDirectiveDef>(".def");
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addDirectiveHandler<&COFFAsmParser::ParseDirectiveScl>(".scl");
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addDirectiveHandler<&COFFAsmParser::ParseDirectiveScl>(".scl");
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addDirectiveHandler<&COFFAsmParser::ParseDirectiveType>(".type");
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addDirectiveHandler<&COFFAsmParser::ParseDirectiveType>(".type");
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@ -100,6 +104,7 @@ class COFFAsmParser : public MCAsmParserExtension {
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SectionKind::getBSS());
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SectionKind::getBSS());
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}
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}
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bool ParseDirectiveSection(StringRef, SMLoc);
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bool ParseDirectiveDef(StringRef, SMLoc);
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bool ParseDirectiveDef(StringRef, SMLoc);
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bool ParseDirectiveScl(StringRef, SMLoc);
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bool ParseDirectiveScl(StringRef, SMLoc);
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bool ParseDirectiveType(StringRef, SMLoc);
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bool ParseDirectiveType(StringRef, SMLoc);
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@ -130,6 +135,119 @@ public:
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} // end annonomous namespace.
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} // end annonomous namespace.
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static SectionKind computeSectionKind(unsigned Flags) {
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if (Flags & COFF::IMAGE_SCN_MEM_EXECUTE)
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return SectionKind::getText();
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if (Flags & COFF::IMAGE_SCN_MEM_READ &&
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(Flags & COFF::IMAGE_SCN_MEM_WRITE) == 0)
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return SectionKind::getReadOnly();
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return SectionKind::getDataRel();
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}
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bool COFFAsmParser::ParseSectionFlags(StringRef FlagsString, unsigned* Flags) {
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enum {
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None = 0,
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Alloc = 1 << 0,
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Code = 1 << 1,
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Load = 1 << 2,
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InitData = 1 << 3,
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Shared = 1 << 4,
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NoLoad = 1 << 5,
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NoRead = 1 << 6,
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NoWrite = 1 << 7
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};
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bool ReadOnlyRemoved = false;
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unsigned SecFlags = None;
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for (unsigned i = 0; i < FlagsString.size(); ++i) {
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switch (FlagsString[i]) {
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case 'a':
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// Ignored.
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break;
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case 'b': // bss section
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SecFlags |= Alloc;
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if (SecFlags & InitData)
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return TokError("conflicting section flags 'b' and 'd'.");
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SecFlags &= ~Load;
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break;
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case 'd': // data section
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SecFlags |= InitData;
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if (SecFlags & Alloc)
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return TokError("conflicting section flags 'b' and 'd'.");
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SecFlags &= ~NoWrite;
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if ((SecFlags & NoLoad) == 0)
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SecFlags |= Load;
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break;
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case 'n': // section is not loaded
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SecFlags |= NoLoad;
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SecFlags &= ~Load;
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break;
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case 'r': // read-only
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ReadOnlyRemoved = false;
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SecFlags |= NoWrite;
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if ((SecFlags & Code) == 0)
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SecFlags |= InitData;
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if ((SecFlags & NoLoad) == 0)
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SecFlags |= Load;
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break;
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case 's': // shared section
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SecFlags |= Shared | InitData;
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SecFlags &= ~NoWrite;
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if ((SecFlags & NoLoad) == 0)
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SecFlags |= Load;
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break;
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case 'w': // writable
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SecFlags &= ~NoWrite;
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ReadOnlyRemoved = true;
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break;
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case 'x': // executable section
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SecFlags |= Code;
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if ((SecFlags & NoLoad) == 0)
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SecFlags |= Load;
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if (!ReadOnlyRemoved)
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SecFlags |= NoWrite;
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break;
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case 'y': // not readable
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SecFlags |= NoRead | NoWrite;
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break;
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default:
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return TokError("unknown flag");
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}
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}
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*Flags = 0;
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if (SecFlags == None)
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SecFlags = InitData;
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if (SecFlags & Code)
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*Flags |= COFF::IMAGE_SCN_CNT_CODE | COFF::IMAGE_SCN_MEM_EXECUTE;
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if (SecFlags & InitData)
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*Flags |= COFF::IMAGE_SCN_CNT_INITIALIZED_DATA;
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if ((SecFlags & Alloc) && (SecFlags & Load) == 0)
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*Flags |= COFF::IMAGE_SCN_CNT_UNINITIALIZED_DATA;
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if (SecFlags & NoLoad)
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*Flags |= COFF::IMAGE_SCN_LNK_REMOVE;
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if ((SecFlags & NoRead) == 0)
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*Flags |= COFF::IMAGE_SCN_MEM_READ;
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if ((SecFlags & NoWrite) == 0)
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*Flags |= COFF::IMAGE_SCN_MEM_WRITE;
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if (SecFlags & Shared)
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*Flags |= COFF::IMAGE_SCN_MEM_SHARED;
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return false;
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}
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/// ParseDirectiveSymbolAttribute
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/// ParseDirectiveSymbolAttribute
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/// ::= { ".weak", ... } [ identifier ( , identifier )* ]
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/// ::= { ".weak", ... } [ identifier ( , identifier )* ]
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bool COFFAsmParser::ParseDirectiveSymbolAttribute(StringRef Directive, SMLoc) {
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bool COFFAsmParser::ParseDirectiveSymbolAttribute(StringRef Directive, SMLoc) {
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@ -174,6 +292,60 @@ bool COFFAsmParser::ParseSectionSwitch(StringRef Section,
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return false;
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return false;
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}
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}
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bool COFFAsmParser::ParseSectionName(StringRef &SectionName) {
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if (!getLexer().is(AsmToken::Identifier))
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return true;
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SectionName = getTok().getIdentifier();
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Lex();
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return false;
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}
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// .section name [, "flags"]
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//
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// Supported flags:
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// a: Ignored.
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// b: BSS section (uninitialized data)
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// d: data section (initialized data)
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// n: Discardable section
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// r: Readable section
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// s: Shared section
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// w: Writable section
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// x: Executable section
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// y: Not-readable section (clears 'r')
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//
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// Subsections are not supported.
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bool COFFAsmParser::ParseDirectiveSection(StringRef, SMLoc) {
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StringRef SectionName;
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if (ParseSectionName(SectionName))
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return TokError("expected identifier in directive");
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unsigned Flags = COFF::IMAGE_SCN_CNT_INITIALIZED_DATA |
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COFF::IMAGE_SCN_MEM_READ |
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COFF::IMAGE_SCN_MEM_WRITE;
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if (getLexer().is(AsmToken::Comma)) {
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Lex();
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if (getLexer().isNot(AsmToken::String))
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return TokError("expected string in directive");
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StringRef FlagsStr = getTok().getStringContents();
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Lex();
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if (ParseSectionFlags(FlagsStr, &Flags))
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return true;
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}
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if (getLexer().isNot(AsmToken::EndOfStatement))
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return TokError("unexpected token in directive");
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SectionKind Kind = computeSectionKind(Flags);
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ParseSectionSwitch(SectionName, Flags, Kind);
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return false;
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}
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bool COFFAsmParser::ParseDirectiveDef(StringRef, SMLoc) {
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bool COFFAsmParser::ParseDirectiveDef(StringRef, SMLoc) {
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StringRef SymbolName;
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StringRef SymbolName;
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8
test/MC/COFF/section-invalid-flags.s
Normal file
8
test/MC/COFF/section-invalid-flags.s
Normal file
@ -0,0 +1,8 @@
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// RUN: not llvm-mc -triple i386-pc-win32 -filetype=obj %s 2>&1 | FileCheck %s
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// RUN: not llvm-mc -triple x86_64-pc-win32 -filetype=obj %s 2>&1 | FileCheck %s
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// CHECK: error: conflicting section flags 'b' and 'd'
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.section s_db,"db"; .long 1
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// CHECK: error: conflicting section flags 'b' and 'd'
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.section s_bd,"bd"; .long 1
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170
test/MC/COFF/section.s
Normal file
170
test/MC/COFF/section.s
Normal file
@ -0,0 +1,170 @@
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// RUN: llvm-mc -triple i386-pc-win32 -filetype=obj %s | llvm-readobj -s | FileCheck %s
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// RUN: llvm-mc -triple x86_64-pc-win32 -filetype=obj %s | llvm-readobj -s | FileCheck %s
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.section .foo$bar; .long 1
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.section .foo@bar; .long 1
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.section ABCDEFGHIJKLMNOPQRSTUVWXYZ; .long 1
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.section abcdefghijklmnopqrstuvwxyz; .long 1
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.section _0123456789; .long 1
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// CHECK: Sections [
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// CHECK: Section {
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// CHECK: Name: .foo$bar
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// CHECK: }
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// CHECK: Section {
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// CHECK: Name: .foo@bar
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// CHECK: }
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// CHECK: Section {
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// CHECK: Name: ABCDEFGHIJKLMNOPQRSTUVWXYZ
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// CHECK: }
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// CHECK: Section {
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// CHECK: Name: abcdefghijklmnopqrstuvwxyz
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// CHECK: }
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// CHECK: Section {
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// CHECK: Name: _0123456789
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// CHECK: }
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// Test that the defaults are used
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.section s ; .long 1
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.section s_, "" ; .long 1
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.section s_a,"a"; .long 1
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.section s_b,"b"; .long 1
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.section s_d,"d"; .long 1
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.section s_n,"n"; .long 1
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.section s_r,"r"; .long 1
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.section s_s,"s"; .long 1
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.section s_w,"w"; .long 1
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.section s_x,"x"; .long 1
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.section s_y,"y"; .long 1
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// CHECK: Section {
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// CHECK: Name: s
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// CHECK: Characteristics [
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// CHECK-NEXT: IMAGE_SCN_ALIGN_1BYTES
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// CHECK-NEXT: IMAGE_SCN_CNT_INITIALIZED_DATA
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// CHECK-NEXT: IMAGE_SCN_MEM_READ
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// CHECK-NEXT: IMAGE_SCN_MEM_WRITE
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// CHECK-NEXT: ]
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// CHECK: }
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// CHECK: Section {
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// CHECK: Name: s_
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// CHECK: Characteristics [
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// CHECK-NEXT: IMAGE_SCN_ALIGN_1BYTES
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// CHECK-NEXT: IMAGE_SCN_CNT_INITIALIZED_DATA
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// CHECK-NEXT: IMAGE_SCN_MEM_READ
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// CHECK-NEXT: IMAGE_SCN_MEM_WRITE
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// CHECK-NEXT: ]
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// CHECK: }
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// CHECK: Section {
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// CHECK: Name: s_a
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// CHECK: Characteristics [
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// CHECK-NEXT: IMAGE_SCN_ALIGN_1BYTES
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// CHECK-NEXT: IMAGE_SCN_CNT_INITIALIZED_DATA
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// CHECK-NEXT: IMAGE_SCN_MEM_READ
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// CHECK-NEXT: IMAGE_SCN_MEM_WRITE
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// CHECK-NEXT: ]
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// CHECK: }
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// CHECK: Section {
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// CHECK: Name: s_b
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// CHECK: Characteristics [
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// CHECK-NEXT: IMAGE_SCN_ALIGN_1BYTES
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// CHECK-NEXT: IMAGE_SCN_CNT_UNINITIALIZED_DATA
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// CHECK-NEXT: IMAGE_SCN_MEM_READ
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// CHECK-NEXT: IMAGE_SCN_MEM_WRITE
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// CHECK-NEXT: ]
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// CHECK: }
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// CHECK: Section {
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// CHECK: Name: s_d
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// CHECK: Characteristics [
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// CHECK-NEXT: IMAGE_SCN_ALIGN_1BYTES
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// CHECK-NEXT: IMAGE_SCN_CNT_INITIALIZED_DATA
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// CHECK-NEXT: IMAGE_SCN_MEM_READ
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// CHECK-NEXT: IMAGE_SCN_MEM_WRITE
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// CHECK-NEXT: ]
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// CHECK: }
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// CHECK: Section {
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// CHECK: Name: s_n
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// CHECK: Characteristics [
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// CHECK-NEXT: IMAGE_SCN_ALIGN_1BYTES
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// CHECK-NEXT: IMAGE_SCN_LNK_REMOVE
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// CHECK-NEXT: IMAGE_SCN_MEM_READ
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// CHECK-NEXT: IMAGE_SCN_MEM_WRITE
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// CHECK-NEXT: ]
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// CHECK: }
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// CHECK: Section {
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// CHECK: Name: s_r
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// CHECK: Characteristics [
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// CHECK-NEXT: IMAGE_SCN_ALIGN_1BYTES
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// CHECK-NEXT: IMAGE_SCN_CNT_INITIALIZED_DATA
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// CHECK-NEXT: IMAGE_SCN_MEM_READ
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// CHECK-NEXT: ]
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// CHECK: }
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// CHECK: Section {
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// CHECK: Name: s_s
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// CHECK: Characteristics [
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// CHECK-NEXT: IMAGE_SCN_ALIGN_1BYTES
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// CHECK-NEXT: IMAGE_SCN_CNT_INITIALIZED_DATA
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// CHECK-NEXT: IMAGE_SCN_MEM_READ
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// CHECK-NEXT: IMAGE_SCN_MEM_SHARED
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// CHECK-NEXT: IMAGE_SCN_MEM_WRITE
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// CHECK-NEXT: ]
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// CHECK: }
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// CHECK: Section {
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// CHECK: Name: s_w
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// CHECK: Characteristics [
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// CHECK-NEXT: IMAGE_SCN_ALIGN_1BYTES
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// CHECK-NEXT: IMAGE_SCN_CNT_INITIALIZED_DATA
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// CHECK-NEXT: IMAGE_SCN_MEM_READ
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// CHECK-NEXT: IMAGE_SCN_MEM_WRITE
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// CHECK-NEXT: ]
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// CHECK: }
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// CHECK: Section {
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// CHECK: Name: s_x
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// CHECK: Characteristics [
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// CHECK-NEXT: IMAGE_SCN_ALIGN_1BYTES
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// CHECK-NEXT: IMAGE_SCN_CNT_CODE
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// CHECK-NEXT: IMAGE_SCN_MEM_EXECUTE
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// CHECK-NEXT: IMAGE_SCN_MEM_READ
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// CHECK-NEXT: ]
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// CHECK: }
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// CHECK: Section {
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// CHECK: Name: s_y
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// CHECK: Characteristics [
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// CHECK-NEXT: IMAGE_SCN_ALIGN_1BYTES
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// CHECK-NEXT: ]
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// CHECK: }
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// w makes read-only to readable
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||||||
|
.section s_rw,"rw"; .long 1
|
||||||
|
// CHECK: Section {
|
||||||
|
// CHECK: Name: s_rw
|
||||||
|
// CHECK: Characteristics [
|
||||||
|
// CHECK-NEXT: IMAGE_SCN_ALIGN_1BYTES
|
||||||
|
// CHECK-NEXT: IMAGE_SCN_CNT_INITIALIZED_DATA
|
||||||
|
// CHECK-NEXT: IMAGE_SCN_MEM_READ
|
||||||
|
// CHECK-NEXT: IMAGE_SCN_MEM_WRITE
|
||||||
|
// CHECK-NEXT: ]
|
||||||
|
// CHECK: }
|
||||||
|
|
||||||
|
// r cancels w
|
||||||
|
.section s_wr,"wr"; .long 1
|
||||||
|
// CHECK: Section {
|
||||||
|
// CHECK: Name: s_wr
|
||||||
|
// CHECK: Characteristics [
|
||||||
|
// CHECK-NEXT: IMAGE_SCN_ALIGN_1BYTES
|
||||||
|
// CHECK-NEXT: IMAGE_SCN_CNT_INITIALIZED_DATA
|
||||||
|
// CHECK-NEXT: IMAGE_SCN_MEM_READ
|
||||||
|
// CHECK-NEXT: ]
|
||||||
|
// CHECK: }
|
||||||
|
|
||||||
|
// y cancels both
|
||||||
|
.section s_rwy,"rwy"; .long 1
|
||||||
|
// CHECK: Section {
|
||||||
|
// CHECK: Name: s_rwy
|
||||||
|
// CHECK: Characteristics [
|
||||||
|
// CHECK-NEXT: IMAGE_SCN_ALIGN_1BYTES
|
||||||
|
// CHECK-NEXT: IMAGE_SCN_CNT_INITIALIZED_DATA
|
||||||
|
// CHECK-NEXT: ]
|
||||||
|
// CHECK: }
|
||||||
|
|
||||||
|
// CHECK: ]
|
||||||
@ -1,7 +1,6 @@
|
|||||||
// This test ensures that, if the section containing a function has a suffix
|
// This test ensures that, if the section containing a function has a suffix
|
||||||
// (e.g. .text$foo), its unwind info section also has a suffix (.xdata$foo).
|
// (e.g. .text$foo), its unwind info section also has a suffix (.xdata$foo).
|
||||||
// RUN: llvm-mc -filetype=obj -triple x86_64-pc-win32 %s | llvm-readobj -s -sd | FileCheck %s
|
// RUN: llvm-mc -filetype=obj -triple x86_64-pc-win32 %s | llvm-readobj -s -sd | FileCheck %s
|
||||||
// XFAIL: *
|
|
||||||
|
|
||||||
// CHECK: Name: .xdata$foo
|
// CHECK: Name: .xdata$foo
|
||||||
// CHECK-NEXT: VirtualSize
|
// CHECK-NEXT: VirtualSize
|
||||||
@ -16,7 +15,6 @@
|
|||||||
// CHECK-NEXT: IMAGE_SCN_ALIGN_4BYTES
|
// CHECK-NEXT: IMAGE_SCN_ALIGN_4BYTES
|
||||||
// CHECK-NEXT: IMAGE_SCN_CNT_INITIALIZED_DATA
|
// CHECK-NEXT: IMAGE_SCN_CNT_INITIALIZED_DATA
|
||||||
// CHECK-NEXT: IMAGE_SCN_MEM_READ
|
// CHECK-NEXT: IMAGE_SCN_MEM_READ
|
||||||
// CHECK-NEXT: IMAGE_SCN_MEM_WRITE
|
|
||||||
// CHECK-NEXT: ]
|
// CHECK-NEXT: ]
|
||||||
// CHECK-NEXT: SectionData (
|
// CHECK-NEXT: SectionData (
|
||||||
// CHECK-NEXT: 0000: 01050200 05500402
|
// CHECK-NEXT: 0000: 01050200 05500402
|
||||||
|
|||||||
Loading…
Reference in New Issue
Block a user