Implement Ada 202x's Integer_Literal, Real_Literal, and String_Literal aspects. This is just a preliminary implementation; interactions with controlled types, build-in-place functions, abstract types, interface types, aspects specifying an operator (e.g, "+"), mandatory aspect overriding, and many other features have not been implemented.
Tested on x86_64-pc-linux-gnu, committed on trunk
2020-06-16 Steve Baird <ba...@adacore.com>
gcc/ada/
* snames.ads-tmpl: Define names of the three new aspects.
* aspects.ads: Define the three new aspects.
* sem_util.ads, sem_util.adb, sem_dim.adb: Move the function
String_From_Numeric_Literal from being declared in the body of
package Sem_Dim to being declared in the visible part of package
Sem_Util.
* sem_ch13.ads, sem_ch13.adb: Declare new visible procedure
Validate_Literal_Aspect. This is where most of the legality
checking occurs for an aspect specification for one of the three
new aspects, as well as resolution of the subprogram named in
the aspect specification. Follow example of other aspects (e.g.,
Validate_Literal_Aspect is called in much the same way as
Validate_Iterable_Aspect in Analyze_Aspects_At_Freeze_Point; a
small amount of legality checking is performed in
Analyze_One_Aspect in much the same way as for Default_Value or
Default_Component_Value aspects). Most of the work is done in
Validate_Literal_Aspect.
* contracts.adb (Add_Contract_Item): Call
Validate_Literal_Aspect in much the same way that
Validate_Iterable_Aspect was already being called.
* sem_res.adb (Resolve): Rewrite a literal as a call if it is a
user-defined literal. This is where the dynamic semantics of
the 3 new aspects are implemented.
* sem_ch6.adb (Fully_Conformant_Expressions): Two numeric
literals that have different text but the same value (e.g.,
12345 and 12_345) do not conform if they are user-defined
literals. Introduce a new function
User_Defined_Numeric_Literal_Mismatch to avoid duplication in
making this check.
* sem_type.adb (Has_Compatible_Type): A numeric literal can be
compatible with a non-numeric type (and a string literal can be
compatible with a non-string type) if it can be interpreted as a
user-defined literal.
patch.diff.gz
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