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Add an !eq() operator to TableGen. It operates on strings only.

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Use !cast<string>() to compare other types of objects.


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@92754 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
David Greene 2010-01-05 19:11:42 +00:00
parent 5f7775c85e
commit 6786d5e183
7 changed files with 37 additions and 2 deletions
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4
docs/TableGenFundamentals.html
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@ -423,6 +423,10 @@ class. This operation is analogous to $(foreach) in GNU make.</dd>
<dd>An integer {0,1} indicating whether list 'a' is empty.</dd>
<dt><tt>!if(a,b,c)</tt></dt>
<dd>'b' if the result of integer operator 'a' is nonzero, 'c' otherwise.</dd>
<dt><tt>!eq(a,b)</tt></dt>
<dd>Integer one if string a is equal to string b, zero otherwise. This
only operates on string objects. Use !cast<string> to compare other
types of objects.</dd>
</dl>
<p>Note that all of the values have rules specifying how they convert to values

13
test/TableGen/eq.td Normal file
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@ -0,0 +1,13 @@
// RUN: tblgen %s | FileCheck %s
// CHECK: Value = 0
// CHECK: Value = 1
class Base<int V> {
int Value = V;
}
class Derived<string Truth> :
Base<!if(!eq(Truth, "true"), 1, 0)>;
def TRUE : Derived<"true">;
def FALSE : Derived<"false">;

10
utils/TableGen/Record.cpp
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@ -730,6 +730,15 @@ Init *BinOpInit::Fold(Record *CurRec, MultiClass *CurMultiClass) {
}
break;
}
case EQ: {
// Make sure we've resolved
StringInit *LHSs = dynamic_cast<StringInit*>(LHS);
StringInit *RHSs = dynamic_cast<StringInit*>(RHS);
if (LHSs && RHSs)
return new IntInit(LHSs->getValue() == RHSs->getValue());
break;
}
case SHL:
case SRA:
case SRL: {
@ -768,6 +777,7 @@ std::string BinOpInit::getAsString() const {
case SHL: Result = "!shl"; break;
case SRA: Result = "!sra"; break;
case SRL: Result = "!srl"; break;
case EQ: Result = "!eq"; break;
case STRCONCAT: Result = "!strconcat"; break;
case NAMECONCAT:
Result = "!nameconcat<" + getType()->getAsString() + ">"; break;

2
utils/TableGen/Record.h
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@ -842,7 +842,7 @@ public:
///
class BinOpInit : public OpInit {
public:
enum BinaryOp { SHL, SRA, SRL, STRCONCAT, CONCAT, NAMECONCAT };
enum BinaryOp { SHL, SRA, SRL, STRCONCAT, CONCAT, NAMECONCAT, EQ };
private:
BinaryOp Opc;
Init *LHS, *RHS;

1
utils/TableGen/TGLexer.cpp
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@ -434,6 +434,7 @@ tgtok::TokKind TGLexer::LexExclaim() {
if (Len == 3 && !memcmp(Start, "sra", 3)) return tgtok::XSRA;
if (Len == 3 && !memcmp(Start, "srl", 3)) return tgtok::XSRL;
if (Len == 3 && !memcmp(Start, "shl", 3)) return tgtok::XSHL;
if (Len == 2 && !memcmp(Start, "eq", 2)) return tgtok::XEq;
if (Len == 9 && !memcmp(Start, "strconcat", 9)) return tgtok::XStrConcat;
if (Len == 10 && !memcmp(Start, "nameconcat", 10)) return tgtok::XNameConcat;
if (Len == 5 && !memcmp(Start, "subst", 5)) return tgtok::XSubst;

2
utils/TableGen/TGLexer.h
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@ -45,7 +45,7 @@ namespace tgtok {
// !keywords.
XConcat, XSRA, XSRL, XSHL, XStrConcat, XNameConcat, XCast, XSubst,
XForEach, XCar, XCdr, XNull, XIf,
XForEach, XCar, XCdr, XNull, XIf, XEq,
// Integer value.
IntVal,

7
utils/TableGen/TGParser.cpp
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@ -792,6 +792,7 @@ Init *TGParser::ParseOperation(Record *CurRec) {
case tgtok::XSRA:
case tgtok::XSRL:
case tgtok::XSHL:
case tgtok::XEq:
case tgtok::XStrConcat:
case tgtok::XNameConcat: { // Value ::= !binop '(' Value ',' Value ')'
BinOpInit::BinaryOp Code;
@ -820,6 +821,11 @@ Init *TGParser::ParseOperation(Record *CurRec) {
Code = BinOpInit::SHL;
Type = new IntRecTy();
break;
case tgtok::XEq:
Lex.Lex(); // eat the operation
Code = BinOpInit::EQ;
Type = new IntRecTy();
break;
case tgtok::XStrConcat:
Lex.Lex(); // eat the operation
Code = BinOpInit::STRCONCAT;
@ -1257,6 +1263,7 @@ Init *TGParser::ParseSimpleValue(Record *CurRec, RecTy *ItemType) {
case tgtok::XSRA:
case tgtok::XSRL:
case tgtok::XSHL:
case tgtok::XEq:
case tgtok::XStrConcat:
case tgtok::XNameConcat: // Value ::= !binop '(' Value ',' Value ')'
case tgtok::XIf: