* Match literals without a stack array and keep parser states in bytes
scan_after_whitespace() built the expected text of true, false, and null in
local std::array objects. With -fstack-protector-strong (the default of
Ubuntu's GCC, among others), a local array gives the function a stack canary
check, which then ran on every token. scan_literal() now takes the text
after the first character as a string literal, with its length as a template
parameter; for contiguous input it compares the rest at once and falls back
to the byte loop on a mismatch, so errors are reported at the same
character. It is out of line, which keeps the token dispatch small.
The parser kept the nesting of arrays and objects in a std::vector<bool>,
whose push_back() GCC calls out of line; it is a std::vector<std::uint8_t>
now.
Signed-off-by: Niels Lohmann <mail@nlohmann.me>
* Skip the literal fast path test without exceptions
The test case compares the error messages of both lexer paths, so it does
not compile with JSON_NOEXCEPTION (the caught exception does not exist).
Signed-off-by: Niels Lohmann <mail@nlohmann.me>
* Allow the string literal parameter of scan_literal() for clang-tidy
The parameter takes the literal by array reference so that its length is
a template parameter; this is the same exemption the C array overloads of
to_json() and from_json() have.
Signed-off-by: Niels Lohmann <mail@nlohmann.me>
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Signed-off-by: Niels Lohmann <mail@nlohmann.me>
Niels Lohmann
fa37b952df