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macros: Add helper debugging function for substituted tokens 

Since this is less noisy, I guess we can keep it in at all times instead
of commenting it. Doing it like so - through a single function call -
means that we avoid creating the string entirely in release builds

Co-authored-by: philberty <philip.herron@embecosm.com>
This commit is contained in:
Arthur Cohen 2022-03-21 16:52:31 +01:00
parent 1bb9a29688
commit 651d9a77ce
1 changed files with 16 additions and 3 deletions
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19
gcc/rust/expand/rust-macro-expand.cc
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@ -960,6 +960,20 @@ transcribe_context (MacroExpander::ContextType ctx,
}
}
static std::string
tokens_to_str (std::vector<std::unique_ptr<AST::Token>> &tokens)
{
std::string str;
if (!tokens.empty ())
{
str += tokens[0]->as_string ();
for (size_t i = 1; i < tokens.size (); i++)
str += " " + tokens[i]->as_string ();
}
return str;
}
AST::ASTFragment
MacroExpander::transcribe_rule (
AST::MacroRule &match_rule, AST::DelimTokenTree &invoc_token_tree,
@ -979,9 +993,8 @@ MacroExpander::transcribe_rule (
std::vector<std::unique_ptr<AST::Token>> substituted_tokens
= substitute_context.substitute_tokens ();
// handy for debugging
// for (auto &tok : substituted_tokens)
// rust_debug ("[tok] %s", tok->as_string ().c_str ());
rust_debug ("substituted tokens: %s",
tokens_to_str (substituted_tokens).c_str ());
// parse it to an ASTFragment
MacroInvocLexer lex (std::move (substituted_tokens));