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MC: Parse .set and assignments.

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git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@74208 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Daniel Dunbar
2009-06-25 21:56:11 +00:00
parent 5f04d1e522
commit 8f780cd789
6 changed files with 69 additions and 3 deletions
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53
tools/llvm-mc/AsmParser.cpp
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@@ -182,7 +182,8 @@ bool AsmParser::ParseStatement() {
const char *IDVal = Lexer.getCurStrVal();
// Consume the identifier, see what is after it.
if (Lexer.Lex() == asmtok::Colon) {
switch (Lexer.Lex()) {
case asmtok::Colon:
// identifier ':' -> Label.
Lexer.Lex();
@@ -192,6 +193,15 @@ bool AsmParser::ParseStatement() {
Out.EmitLabel(Ctx.GetOrCreateSymbol(IDVal));
return ParseStatement();
case asmtok::Equal:
// identifier '=' ... -> assignment statement
Lexer.Lex();
return ParseAssignment(IDVal, false);
default: // Normal instruction or directive.
break;
}
// Otherwise, we have a normal instruction or directive.
@@ -209,7 +219,8 @@ bool AsmParser::ParseStatement() {
if (!strcmp(IDVal, ".static_const"))
return ParseDirectiveSectionSwitch("__TEXT,__static_const");
if (!strcmp(IDVal, ".cstring"))
return ParseDirectiveSectionSwitch("__TEXT,__cstring","cstring_literals");
return ParseDirectiveSectionSwitch("__TEXT,__cstring",
"cstring_literals");
if (!strcmp(IDVal, ".literal4"))
return ParseDirectiveSectionSwitch("__TEXT,__literal4", "4byte_literals");
if (!strcmp(IDVal, ".literal8"))
@@ -291,6 +302,10 @@ bool AsmParser::ParseStatement() {
if (!strcmp(IDVal, ".objc_selector_strs"))
return ParseDirectiveSectionSwitch("__OBJC,__selector_strs");
// Assembler features
if (!strcmp(IDVal, ".set"))
return ParseDirectiveSet();
// Data directives
if (!strcmp(IDVal, ".ascii"))
@@ -336,6 +351,40 @@ bool AsmParser::ParseStatement() {
return false;
}
bool AsmParser::ParseAssignment(const char *Name, bool IsDotSet) {
int64_t Value;
if (ParseExpression(Value))
return true;
if (Lexer.isNot(asmtok::EndOfStatement))
return TokError("unexpected token in assignment");
// Eat the end of statement marker.
Lexer.Lex();
// Get the symbol for this name.
// FIXME: Handle '.'.
MCSymbol *Sym = Ctx.GetOrCreateSymbol(Name);
Out.EmitAssignment(Sym, MCValue::get(Value), IsDotSet);
return false;
}
/// ParseDirectiveSet:
/// ::= .set identifier ',' expression
bool AsmParser::ParseDirectiveSet() {
if (Lexer.isNot(asmtok::Identifier))
return TokError("expected identifier after '.set' directive");
const char *Name = Lexer.getCurStrVal();
if (Lexer.Lex() != asmtok::Comma)
return TokError("unexpected token in '.set'");
Lexer.Lex();
return ParseAssignment(Name, true);
}
/// ParseDirectiveSection:
/// ::= .section identifier (',' identifier)*
/// FIXME: This should actually parse out the segment, section, attributes and