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Introduce RightArrow (->) token in the scanner

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This commit is contained in:
Alex Beregszaszi 2020-08-12 18:56:24 +01:00
parent fdc4142b2c
commit 4e5b403c37
9 changed files with 18 additions and 14 deletions
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1
Changelog.md
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@ -15,6 +15,7 @@ Compiler Features:
Bugfixes:
* AST: Remove ``null`` member values also when the compiler is used in standard-json-mode.
* Optimizer: Keep side-effects of ``x`` in ``byte(a, shr(b, x))`` even if the constants ``a`` and ``b`` would make the expression zero unconditionally. This optimizer rule is very hard if not impossible to trigger in a way that it can result in invalid code, though.
* Scanner: Fix bug where whitespace would be allowed within the ``->`` token (e.g. ``function f() - > x {}`` becomes invalid in inline assembly and Yul).
* SMTChecker: Fix internal error in BMC function inlining.
* SMTChecker: Fix internal error on array implicit conversion.
* SMTChecker: Fix internal error on fixed bytes index access.

5
docs/grammar/SolidityLexer.g4
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@ -112,6 +112,7 @@ Semicolon: ';';
Period: '.';
Conditional: '?';
Arrow: '=>';
RightArrow: '->';
Assign: '=';
AssignBitOr: '|=';
@ -283,9 +284,7 @@ YulRParen: ')';
YulAssign: ':=';
YulPeriod: '.';
YulComma: ',';
// TODO: remove whitespace workaround once the parser disallows it.
//@doc:name ->
YulArrow: '->' | '-' YulWS+ '>';
YulArrow: '->';
/**
* Yul identifiers consist of letters, dollar signs, underscores and numbers, but may not start with a number.

4
liblangutil/Scanner.cpp
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@ -563,12 +563,14 @@ void Scanner::scanToken()
token = Token::Add;
break;
case '-':
// - -- -=
// - -- -= ->
advance();
if (m_char == '-')
token = selectToken(Token::Dec);
else if (m_char == '=')
token = selectToken(Token::AssignSub);
else if (m_char == '>')
token = selectToken(Token::RightArrow);
else
token = Token::Sub;
break;

1
liblangutil/Token.h
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@ -84,6 +84,7 @@ namespace solidity::langutil
T(Period, ".", 0) \
T(Conditional, "?", 3) \
T(Arrow, "=>", 0) \
T(RightArrow, "->", 0) \
\
/* Assignment operators. */ \
/* IsAssignmentOp() relies on this block of enum values being */ \

5
libyul/AsmParser.cpp
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@ -401,10 +401,9 @@ FunctionDefinition Parser::parseFunctionDefinition()
expectToken(Token::Comma);
}
expectToken(Token::RParen);
if (currentToken() == Token::Sub)
if (currentToken() == Token::RightArrow)
{
expectToken(Token::Sub);
expectToken(Token::GreaterThan);
expectToken(Token::RightArrow);
while (true)
{
funDef.returnVariables.emplace_back(parseTypedName());

6
test/liblangutil/Scanner.cpp
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@ -782,8 +782,7 @@ BOOST_AUTO_TEST_CASE(yul_function)
BOOST_CHECK_EQUAL(scanner.next(), Token::Comma);
BOOST_CHECK_EQUAL(scanner.next(), Token::Identifier);
BOOST_CHECK_EQUAL(scanner.next(), Token::RParen);
BOOST_CHECK_EQUAL(scanner.next(), Token::Sub);
BOOST_CHECK_EQUAL(scanner.next(), Token::GreaterThan);
BOOST_CHECK_EQUAL(scanner.next(), Token::RightArrow);
BOOST_CHECK_EQUAL(scanner.next(), Token::Identifier);
BOOST_CHECK_EQUAL(scanner.next(), Token::Comma);
BOOST_CHECK_EQUAL(scanner.next(), Token::Identifier);
@ -797,8 +796,7 @@ BOOST_AUTO_TEST_CASE(yul_function)
BOOST_CHECK_EQUAL(scanner.next(), Token::Comma);
BOOST_CHECK_EQUAL(scanner.next(), Token::Identifier);
BOOST_CHECK_EQUAL(scanner.next(), Token::RParen);
BOOST_CHECK_EQUAL(scanner.next(), Token::Sub);
BOOST_CHECK_EQUAL(scanner.next(), Token::GreaterThan);
BOOST_CHECK_EQUAL(scanner.next(), Token::RightArrow);
BOOST_CHECK_EQUAL(scanner.next(), Token::Identifier);
BOOST_CHECK_EQUAL(scanner.next(), Token::Comma);
BOOST_CHECK_EQUAL(scanner.next(), Token::Identifier);

2
test/libsolidity/semanticTests/inlineAssembly/inline_assembly_embedded_function_call.sol
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@ -5,7 +5,7 @@ contract C {
function asmfun(a, b, c) -> x, y, z {
x := g(a)
function g(r) - > s {
function g(r) -> s {
s := mul(r, r)
}
y := g(b)

4
test/libsolidity/syntaxTests/inlineAssembly/function_definition_whitespace.sol
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@ -5,4 +5,6 @@ contract C {
}
}
}
}
}
// ----
// ParserError 2314: (87-88): Expected '{' but got '-'

4
test/libyul/yulSyntaxTests/function_definition_whitespace.yul
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@ -1,4 +1,6 @@
{
function f (a, b , c ) - > y,x,z {
}
}
}
// ----
// ParserError 2314: (30-31): Expected '{' but got '-'