Introduce value_at_non_lval
In some cases, while a value might be read from memory, gdb should not record the value as being equivalent to that memory. In Ada, the inferior call code will call ada_convert_actual -- and here, if the argument is already in memory, that address will simply be reused. However, for a call like "f(g())", the result of "g" might be on the stack and thus overwritten by the call to "f". This patch introduces a new function that is like value_at but that ensures that the result is non-lvalue.
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gdb/valops.c
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gdb/valops.c
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@ -1019,6 +1019,16 @@ value_at (struct type *type, CORE_ADDR addr)
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return get_value_at (type, addr, 0);
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}
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/* See value.h. */
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struct value *
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value_at_non_lval (struct type *type, CORE_ADDR addr)
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{
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struct value *result = value_at (type, addr);
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VALUE_LVAL (result) = not_lval;
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return result;
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}
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/* Return a lazy value with type TYPE located at ADDR (cf. value_at).
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The type of the created value may differ from the passed type TYPE.
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Make sure to retrieve the returned values's new type after this call
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@ -711,6 +711,10 @@ extern struct value *value_from_component_bitsize (struct value *whole,
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extern struct value *value_at (struct type *type, CORE_ADDR addr);
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extern struct value *value_at_lazy (struct type *type, CORE_ADDR addr);
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/* Like value_at, but ensures that the result is marked not_lval.
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This can be important if the memory is "volatile". */
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extern struct value *value_at_non_lval (struct type *type, CORE_ADDR addr);
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extern struct value *value_from_contents_and_address_unresolved
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(struct type *, const gdb_byte *, CORE_ADDR);
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extern struct value *value_from_contents_and_address (struct type *,
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