Added the first bits of the ARM target assembler to llvm-mc. For now it only
parses the .word directive as 4 bytes and ARMAsmParser::ParseInstruction will
give an error is called. Broke out the test of the .word directive into two
different test cases, one for x86 and one for arm.
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@81817 91177308-0d34-0410-b5e6-96231b3b80d8
diff --git a/lib/Target/ARM/AsmParser/ARMAsmParser.cpp b/lib/Target/ARM/AsmParser/ARMAsmParser.cpp
new file mode 100644
index 0000000..c0ca149
--- /dev/null
+++ b/lib/Target/ARM/AsmParser/ARMAsmParser.cpp
@@ -0,0 +1,93 @@
+//===-- ARMAsmParser.cpp - Parse ARM assembly to MCInst instructions ------===//
+//
+// The LLVM Compiler Infrastructure
+//
+// This file is distributed under the University of Illinois Open Source
+// License. See LICENSE.TXT for details.
+//
+//===----------------------------------------------------------------------===//
+
+#include "ARM.h"
+#include "llvm/ADT/SmallVector.h"
+#include "llvm/ADT/Twine.h"
+#include "llvm/MC/MCAsmLexer.h"
+#include "llvm/MC/MCAsmParser.h"
+#include "llvm/MC/MCStreamer.h"
+#include "llvm/MC/MCExpr.h"
+#include "llvm/MC/MCInst.h"
+#include "llvm/Support/SourceMgr.h"
+#include "llvm/Target/TargetRegistry.h"
+#include "llvm/Target/TargetAsmParser.h"
+using namespace llvm;
+
+namespace {
+struct ARMOperand;
+
+class ARMAsmParser : public TargetAsmParser {
+ MCAsmParser &Parser;
+
+private:
+ MCAsmParser &getParser() const { return Parser; }
+
+ MCAsmLexer &getLexer() const { return Parser.getLexer(); }
+
+ void Warning(SMLoc L, const Twine &Msg) { Parser.Warning(L, Msg); }
+
+ bool Error(SMLoc L, const Twine &Msg) { return Parser.Error(L, Msg); }
+
+ bool ParseDirectiveWord(unsigned Size, SMLoc L);
+
+public:
+ ARMAsmParser(const Target &T, MCAsmParser &_Parser)
+ : TargetAsmParser(T), Parser(_Parser) {}
+
+ virtual bool ParseInstruction(const StringRef &Name, MCInst &Inst);
+
+ virtual bool ParseDirective(AsmToken DirectiveID);
+};
+
+} // end anonymous namespace
+
+bool ARMAsmParser::ParseInstruction(const StringRef &Name, MCInst &Inst) {
+ SMLoc Loc = getLexer().getTok().getLoc();
+ Error(Loc, "ARMAsmParser::ParseInstruction currently unimplemented");
+ return true;
+}
+
+bool ARMAsmParser::ParseDirective(AsmToken DirectiveID) {
+ StringRef IDVal = DirectiveID.getIdentifier();
+ if (IDVal == ".word")
+ return ParseDirectiveWord(4, DirectiveID.getLoc());
+ return true;
+}
+
+/// ParseDirectiveWord
+/// ::= .word [ expression (, expression)* ]
+bool ARMAsmParser::ParseDirectiveWord(unsigned Size, SMLoc L) {
+ if (getLexer().isNot(AsmToken::EndOfStatement)) {
+ for (;;) {
+ const MCExpr *Value;
+ if (getParser().ParseExpression(Value))
+ return true;
+
+ getParser().getStreamer().EmitValue(Value, Size);
+
+ if (getLexer().is(AsmToken::EndOfStatement))
+ break;
+
+ // FIXME: Improve diagnostic.
+ if (getLexer().isNot(AsmToken::Comma))
+ return Error(L, "unexpected token in directive");
+ getLexer().Lex();
+ }
+ }
+
+ getLexer().Lex();
+ return false;
+}
+
+// Force static initialization.
+extern "C" void LLVMInitializeARMAsmParser() {
+ RegisterAsmParser<ARMAsmParser> X(TheARMTarget);
+ RegisterAsmParser<ARMAsmParser> Y(TheThumbTarget);
+}