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Allow TableGen DAG arguments to be just a name.

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DAG arguments can optionally be named:

  (dag node, node:$name)

With this change, the node is also optional:

  (dag node, node:$name, $name)

The missing node is treated as an UnsetInit, so the above is equivalent
to:

  (dag node, node:$name, ?:$name)

This syntax is useful in output patterns where we currently require the
types of variables to be repeated:

  def : Pat<(subc i32:$b, i32:$c), (SUBCCrr i32:$b, i32:$c)>;

This is preferable:

  def : Pat<(subc i32:$b, i32:$c), (SUBCCrr $b, $c)>;

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@177843 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Jakob Stoklund Olesen
2013-03-24 19:36:51 +00:00
parent 9c22886a01
commit 4717fd4c0f
3 changed files with 38 additions and 16 deletions
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40
lib/TableGen/TGParser.cpp
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@@ -1547,29 +1547,39 @@ Init *TGParser::ParseValue(Record *CurRec, RecTy *ItemType, IDParseMode Mode) {
/// ParseDagArgList - Parse the argument list for a dag literal expression.
///
/// ParseDagArgList ::= Value (':' VARNAME)?
/// ParseDagArgList ::= ParseDagArgList ',' Value (':' VARNAME)?
/// DagArg ::= Value (':' VARNAME)?
/// DagArg ::= VARNAME
/// DagArgList ::= DagArg
/// DagArgList ::= DagArgList ',' DagArg
std::vector<std::pair<llvm::Init*, std::string> >
TGParser::ParseDagArgList(Record *CurRec) {
std::vector<std::pair<llvm::Init*, std::string> > Result;
while (1) {
Init *Val = ParseValue(CurRec);
if (Val == 0) return std::vector<std::pair<llvm::Init*, std::string> >();
// If the variable name is present, add it.
std::string VarName;
if (Lex.getCode() == tgtok::colon) {
if (Lex.Lex() != tgtok::VarName) { // eat the ':'
TokError("expected variable name in dag literal");
// DagArg ::= VARNAME
if (Lex.getCode() == tgtok::VarName) {
// A missing value is treated like '?'.
Result.push_back(std::make_pair(UnsetInit::get(), Lex.getCurStrVal()));
Lex.Lex();
} else {
// DagArg ::= Value (':' VARNAME)?
Init *Val = ParseValue(CurRec);
if (Val == 0)
return std::vector<std::pair<llvm::Init*, std::string> >();
// If the variable name is present, add it.
std::string VarName;
if (Lex.getCode() == tgtok::colon) {
if (Lex.Lex() != tgtok::VarName) { // eat the ':'
TokError("expected variable name in dag literal");
return std::vector<std::pair<llvm::Init*, std::string> >();
}
VarName = Lex.getCurStrVal();
Lex.Lex(); // eat the VarName.
}
VarName = Lex.getCurStrVal();
Lex.Lex(); // eat the VarName.
Result.push_back(std::make_pair(Val, VarName));
}
Result.push_back(std::make_pair(Val, VarName));
if (Lex.getCode() != tgtok::comma) break;
Lex.Lex(); // eat the ','
}