Add AsmParser::parseDecimalInteger. (#96255)

An attribute parser needs to parse lists of possibly negative integers
separated by x in a way which is foiled by parseInteger handling hex
formats and parseIntegerInDimensionList does not allow negatives.

---------

Co-authored-by: Jacques Pienaar <jpienaar@google.com>

mlir/include/mlir/IR/OpImplementation.h

@@ -714,16 +714,27 @@ public:
     return *parseResult;
   }
 
+  /// Parse a decimal integer value from the stream.
+  template <typename IntT>
+  ParseResult parseDecimalInteger(IntT &result) {
+    auto loc = getCurrentLocation();
+    OptionalParseResult parseResult = parseOptionalDecimalInteger(result);
+    if (!parseResult.has_value())
+      return emitError(loc, "expected decimal integer value");
+    return *parseResult;
+  }
+
   /// Parse an optional integer value from the stream.
   virtual OptionalParseResult parseOptionalInteger(APInt &result) = 0;
+  virtual OptionalParseResult parseOptionalDecimalInteger(APInt &result) = 0;
 
-  template <typename IntT>
-  OptionalParseResult parseOptionalInteger(IntT &result) {
+ private:
+  template <typename IntT, typename ParseFn>
+  OptionalParseResult parseOptionalIntegerAndCheck(IntT &result,
+                                                   ParseFn &&parseFn) {
     auto loc = getCurrentLocation();
-
-    // Parse the unsigned variant.
     APInt uintResult;
-    OptionalParseResult parseResult = parseOptionalInteger(uintResult);
+    OptionalParseResult parseResult = parseFn(uintResult);
     if (!parseResult.has_value() || failed(*parseResult))
       return parseResult;
 
@@ -737,6 +748,20 @@ public:
     return success();
   }
 
+ public:
+  template <typename IntT>
+  OptionalParseResult parseOptionalInteger(IntT &result) {
+    return parseOptionalIntegerAndCheck(
+        result, [&](APInt &result) { return parseOptionalInteger(result); });
+  }
+
+  template <typename IntT>
+  OptionalParseResult parseOptionalDecimalInteger(IntT &result) {
+    return parseOptionalIntegerAndCheck(result, [&](APInt &result) {
+      return parseOptionalDecimalInteger(result);
+    });
+  }
+
   /// These are the supported delimiters around operand lists and region
   /// argument lists, used by parseOperandList.
   enum class Delimiter {

mlir/lib/AsmParser/AsmParserImpl.h

@@ -322,6 +322,11 @@ public:
     return parser.parseOptionalInteger(result);
   }
 
+  /// Parse an optional integer value from the stream.
+  OptionalParseResult parseOptionalDecimalInteger(APInt &result) override {
+    return parser.parseOptionalDecimalInteger(result);
+  }
+
   /// Parse a list of comma-separated items with an optional delimiter.  If a
   /// delimiter is provided, then an empty list is allowed.  If not, then at
   /// least one element will be parsed.

mlir/lib/AsmParser/Parser.cpp

@@ -41,6 +41,7 @@
 #include "llvm/ADT/STLExtras.h"
 #include "llvm/ADT/ScopeExit.h"
 #include "llvm/ADT/Sequence.h"
+#include "llvm/ADT/StringExtras.h"
 #include "llvm/ADT/StringMap.h"
 #include "llvm/ADT/StringSet.h"
 #include "llvm/Support/Alignment.h"
@@ -307,6 +308,45 @@ OptionalParseResult Parser::parseOptionalInteger(APInt &result) {
   return success();
 }
 
+/// Parse an optional integer value only in decimal format from the stream.
+OptionalParseResult Parser::parseOptionalDecimalInteger(APInt &result) {
+  Token curToken = getToken();
+  if (curToken.isNot(Token::integer, Token::minus)) {
+    return std::nullopt;
+  }
+
+  bool negative = consumeIf(Token::minus);
+  Token curTok = getToken();
+  if (parseToken(Token::integer, "expected integer value")) {
+    return failure();
+  }
+
+  StringRef spelling = curTok.getSpelling();
+  // If the integer is in hexadecimal return only the 0. The lexer has already
+  // moved past the entire hexidecimal encoded integer so we reset the lex
+  // pointer to just past the 0 we actualy want to consume.
+  if (spelling[0] == '0' && spelling.size() > 1 &&
+      llvm::toLower(spelling[1]) == 'x') {
+    result = 0;
+    state.lex.resetPointer(spelling.data() + 1);
+    consumeToken();
+    return success();
+  }
+
+  if (spelling.getAsInteger(10, result))
+    return emitError(curTok.getLoc(), "integer value too large");
+
+  // Make sure we have a zero at the top so we return the right signedness.
+  if (result.isNegative())
+    result = result.zext(result.getBitWidth() + 1);
+
+  // Process the negative sign if present.
+  if (negative)
+    result.negate();
+
+  return success();
+}
+
 /// Parse a floating point value from an integer literal token.
 ParseResult Parser::parseFloatFromIntegerLiteral(
     std::optional<APFloat> &result, const Token &tok, bool isNegative,

mlir/lib/AsmParser/Parser.h

@@ -144,6 +144,9 @@ public:
   /// Parse an optional integer value from the stream.
   OptionalParseResult parseOptionalInteger(APInt &result);
 
+  /// Parse an optional integer value only in decimal format from the stream.
+  OptionalParseResult parseOptionalDecimalInteger(APInt &result);
+
   /// Parse a floating point value from an integer literal token.
   ParseResult parseFloatFromIntegerLiteral(std::optional<APFloat> &result,
                                            const Token &tok, bool isNegative,

mlir/test/lib/Dialect/Test/TestAttrDefs.td

@@ -81,6 +81,15 @@ def AttrWithTrait : Test_Attr<"AttrWithTrait", [TestAttrTrait]> {
   let mnemonic = "attr_with_trait";
 }
 
+// An attribute of a list of decimal formatted integers in similar format to shapes.
+def TestDecimalShapeAttr : Test_Attr<"TestDecimalShape"> {
+  let mnemonic = "decimal_shape";
+
+  let parameters = (ins ArrayRefParameter<"int64_t">:$shape);
+
+  let hasCustomAssemblyFormat = 1;
+}
+
 // Test support for ElementsAttrInterface.
 def TestI64ElementsAttr : Test_Attr<"TestI64Elements", [ElementsAttrInterface]> {
   let mnemonic = "i64_elements";

mlir/test/lib/Dialect/Test/TestAttributes.cpp

@@ -13,9 +13,12 @@
 
 #include "TestAttributes.h"
 #include "TestDialect.h"
+#include "TestTypes.h"
+#include "mlir/IR/Attributes.h"
 #include "mlir/IR/Builders.h"
 #include "mlir/IR/DialectImplementation.h"
 #include "mlir/IR/ExtensibleDialect.h"
+#include "mlir/IR/OpImplementation.h"
 #include "mlir/IR/Types.h"
 #include "llvm/ADT/APFloat.h"
 #include "llvm/ADT/Hashing.h"
@@ -63,6 +66,39 @@ void CompoundAAttr::print(AsmPrinter &printer) const {
 // CompoundAAttr
 //===----------------------------------------------------------------------===//
 
+Attribute TestDecimalShapeAttr::parse(AsmParser &parser, Type type) {
+  if (parser.parseLess()){
+    return Attribute();
+  }
+  SmallVector<int64_t> shape;
+  if (parser.parseOptionalGreater()) {
+    auto parseDecimal = [&]() {
+      shape.emplace_back();
+      auto parseResult = parser.parseOptionalDecimalInteger(shape.back());
+      if (!parseResult.has_value() || failed(*parseResult)) {
+        parser.emitError(parser.getCurrentLocation()) << "expected an integer";
+        return failure();
+      }
+      return success();
+    };
+    if (failed(parseDecimal())) {
+      return Attribute();
+    }
+    while (failed(parser.parseOptionalGreater())) {
+      if (failed(parser.parseXInDimensionList()) || failed(parseDecimal())) {
+        return Attribute();
+      }
+    }
+  }
+  return get(parser.getContext(), shape);
+}
+
+void TestDecimalShapeAttr::print(AsmPrinter &printer) const {
+  printer << "<";
+  llvm::interleave(getShape(), printer, "x");
+  printer << ">";
+}
+
 Attribute TestI64ElementsAttr::parse(AsmParser &parser, Type type) {
   SmallVector<uint64_t> elements;
   if (parser.parseLess() || parser.parseLSquare())

mlir/test/mlir-tblgen/testdialect-attrdefs.mlir

@@ -1,4 +1,4 @@
-// RUN: mlir-opt %s | mlir-opt -verify-diagnostics | FileCheck %s
+// RUN: mlir-opt %s -split-input-file -verify-diagnostics | FileCheck %s
 
 // CHECK-LABEL: func private @compoundA()
 // CHECK-SAME: #test.cmpnd_a<1, !test.smpla, [5, 6]>
@@ -19,3 +19,28 @@ func.func private @qualifiedAttr() attributes {foo = #test.cmpnd_nested_outer_qu
 func.func private @overriddenAttr() attributes {
   foo = #test.override_builder<5>
 }
+
+// CHECK-LABEL: @decimalIntegerShapeEmpty
+// CHECK-SAME: foo = #test.decimal_shape<>
+func.func private @decimalIntegerShapeEmpty() attributes {
+  foo = #test.decimal_shape<>
+}
+
+// CHECK-LABEL: @decimalIntegerShape
+// CHECK-SAME: foo = #test.decimal_shape<5>
+func.func private @decimalIntegerShape() attributes {
+  foo = #test.decimal_shape<5>
+}
+
+// CHECK-LABEL: @decimalIntegerShapeMultiple
+// CHECK-SAME: foo = #test.decimal_shape<0x3x7>
+func.func private @decimalIntegerShapeMultiple() attributes {
+  foo = #test.decimal_shape<0x3x7>
+}
+
+// -----
+
+func.func private @hexdecimalInteger() attributes {
+// expected-error @below {{expected an integer}}
+  sdg = #test.decimal_shape<1x0xb>
+}