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ARGSCAT has been used for nd_args to hold index and rvalue,
because there was limitation on the number of members for Node.
We can easily change structure of node now, let's expand it.
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This node type was added for the multi-value experiment back in 2004.
The feature itself was removed after a few years, but this is its
remnant.
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All kind of AST nodes use same struct RNode, which has u1, u2, u3 union members
for holding different kind of data.
This has two problems.
1. Low flexibility of data structure
Some nodes, for example NODE_TRUE, don’t use u1, u2, u3. On the other hand,
NODE_OP_ASGN2 needs more than three union members. However they use same
structure definition, need to allocate three union members for NODE_TRUE and
need to separate NODE_OP_ASGN2 into another node.
This change removes the restriction so make it possible to
change data structure by each node type.
2. No compile time check for union member access
It’s developer’s responsibility for using correct member for each node type when it’s union.
This change clarifies which node has which type of fields and enables compile time check.
This commit also changes node_buffer_elem_struct buf management to handle
different size data with alignment.
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After a0f12a0258e4020bd657ee80b7d8f22bd33ea223 NODE_GASGN and
NODE_GVAR hold same value on both nd_vid and nd_entry.
This commit stops setting value to nd_entry and makes to use only
nd_vid.
Notes:
Merged: https://github.com/ruby/ruby/pull/8261
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Notes:
Merged: https://github.com/ruby/ruby/pull/8260
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Notes:
Merged: https://github.com/ruby/ruby/pull/7955
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Introduce Universal Parser mode for the parser.
This commit includes these changes:
* Introduce `UNIVERSAL_PARSER` macro. All of CRuby related functions
are passed via `struct rb_parser_config_struct` when this macro is enabled.
* Add CI task with 'cppflags=-DUNIVERSAL_PARSER' for ubuntu.
Notes:
Merged: https://github.com/ruby/ruby/pull/7927
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