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

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

1 files changed, 4 insertions, 2 deletions

diff --git a/llvm/lib/Target/Mips/MCTargetDesc/MipsELFStreamer.h b/llvm/lib/Target/Mips/MCTargetDesc/MipsELFStreamer.h
index 8ffca340193..d141f5d77c6 100644
--- a/llvm/lib/Target/Mips/MCTargetDesc/MipsELFStreamer.h
+++ b/llvm/lib/Target/Mips/MCTargetDesc/MipsELFStreamer.h
@@ -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();