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[mips] Replace custom parsing logic for data directives by the addAliasForDirective

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The target independent AsmParser doesn't recognise .hword, .word, .dword
which are required for Mips. Currently MipsAsmParser recognises these
through dispatch to MipsAsmParser::parseDataDirective. This contains
equivalent logic to AsmParser::parseDirectiveValue. This patch allows
reuse of AsmParser::parseDirectiveValue by making use of
addAliasForDirective to support .hword, .word and .dword.

Original patch provided by Alex Bradbury at D47001 was modified to fix
handling of microMIPS symbols. The `AsmParser::parseDirectiveValue`
calls either `EmitIntValue` or `EmitValue`. In this patch we override
`EmitIntValue` in the `MipsELFStreamer` to clear a pending set of
microMIPS symbols.

Differential revision: https://reviews.llvm.org/D49539

llvm-svn: 337893
This commit is contained in:
Simon Atanasyan 2018-07-25 07:07:43 +00:00
parent 1723ca6607
commit e20575db92
4 changed files with 57 additions and 43 deletions
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43
lib/Target/Mips/AsmParser/MipsAsmParser.cpp
View File

@ -355,7 +355,6 @@ class MipsAsmParser : public MCTargetAsmParser {
bool parseSetAssignment();
bool parseDataDirective(unsigned Size, SMLoc L);
bool parseDirectiveGpWord();
bool parseDirectiveGpDWord();
bool parseDirectiveDtpRelWord();
@ -487,6 +486,9 @@ public:
MCAsmParserExtension::Initialize(parser);
parser.addAliasForDirective(".asciiz", ".asciz");
parser.addAliasForDirective(".hword", ".2byte");
parser.addAliasForDirective(".word", ".4byte");
parser.addAliasForDirective(".dword", ".8byte");
// Initialize the set of available features.
setAvailableFeatures(ComputeAvailableFeatures(getSTI().getFeatureBits()));
@ -7357,31 +7359,6 @@ bool MipsAsmParser::parseDirectiveSet() {
return parseSetAssignment();
}
/// parseDataDirective
/// ::= .word [ expression (, expression)* ]
bool MipsAsmParser::parseDataDirective(unsigned Size, SMLoc L) {
MCAsmParser &Parser = getParser();
if (getLexer().isNot(AsmToken::EndOfStatement)) {
while (true) {
const MCExpr *Value;
if (getParser().parseExpression(Value))
return true;
getParser().getStreamer().EmitValue(Value, Size);
if (getLexer().is(AsmToken::EndOfStatement))
break;
if (getLexer().isNot(AsmToken::Comma))
return Error(L, "unexpected token, expected comma");
Parser.Lex();
}
}
Parser.Lex();
return false;
}
/// parseDirectiveGpWord
/// ::= .gpword local_sym
bool MipsAsmParser::parseDirectiveGpWord() {
@ -7961,10 +7938,6 @@ bool MipsAsmParser::ParseDirective(AsmToken DirectiveID) {
parseDirectiveCpRestore(DirectiveID.getLoc());
return false;
}
if (IDVal == ".dword") {
parseDataDirective(8, DirectiveID.getLoc());
return false;
}
if (IDVal == ".ent") {
StringRef SymbolName;
@ -8212,16 +8185,6 @@ bool MipsAsmParser::ParseDirective(AsmToken DirectiveID) {
return false;
}
if (IDVal == ".word") {
parseDataDirective(4, DirectiveID.getLoc());
return false;
}
if (IDVal == ".hword") {
parseDataDirective(2, DirectiveID.getLoc());
return false;
}
if (IDVal == ".option") {
parseDirectiveOption();
return false;

5
lib/Target/Mips/MCTargetDesc/MipsELFStreamer.cpp
View File

@ -86,6 +86,11 @@ void MipsELFStreamer::EmitValueImpl(const MCExpr *Value, unsigned Size,
Labels.clear();
}
void MipsELFStreamer::EmitIntValue(uint64_t Value, unsigned Size) {
MCELFStreamer::EmitIntValue(Value, Size);
Labels.clear();
}
void MipsELFStreamer::EmitMipsOptionRecords() {
for (const auto &I : MipsOptionRecords)
I->EmitMipsOptionRecord();

6
lib/Target/Mips/MCTargetDesc/MipsELFStreamer.h
View File

@ -54,9 +54,11 @@ public:
void SwitchSection(MCSection *Section,
const MCExpr *Subsection = nullptr) override;
/// Overriding this function allows us to dismiss all labels that are
/// candidates for marking as microMIPS when .word directive is emitted.
/// Overriding these functions allows us to dismiss all labels that are
/// candidates for marking as microMIPS when .word/.long/.4byte etc
/// directives are emitted.
void EmitValueImpl(const MCExpr *Value, unsigned Size, SMLoc Loc) override;
void EmitIntValue(uint64_t Value, unsigned Size) override;
/// Emits all the option records stored up until the point it's called.
void EmitMipsOptionRecords();

46
test/MC/Mips/micromips-label-test.s
View File

@ -9,6 +9,16 @@ g:
nop
h:
.word 0
k:
.long 0
l:
.hword 0
m:
.2byte 0
n:
.4byte 0
o:
.8byte 0
i:
nop
j:
@ -54,5 +64,39 @@ j:
# CHECK: Other: 0
# CHECK: Section: .text
# CHECK: }
# CHECK: Symbol {
# CHECK: Name: k
# CHECK: Binding: Local
# CHECK: Type: None
# CHECK: Other: 0
# CHECK: Section: .text
# CHECK: }
# CHECK: Symbol {
# CHECK: Name: l
# CHECK: Binding: Local
# CHECK: Type: None
# CHECK: Other: 0
# CHECK: Section: .text
# CHECK: }
# CHECK: Symbol {
# CHECK: Name: m
# CHECK: Binding: Local
# CHECK: Type: None
# CHECK: Other: 0
# CHECK: Section: .text
# CHECK: }
# CHECK: Symbol {
# CHECK: Name: n
# CHECK: Binding: Local
# CHECK: Type: None
# CHECK: Other: 0
# CHECK: Section: .text
# CHECK: }
# CHECK: Symbol {
# CHECK: Name: o
# CHECK: Binding: Local
# CHECK: Type: None
# CHECK: Other: 0
# CHECK: Section: .text
# CHECK: }
# CHECK: ]