forked from M-Labs/nac3
[core] codegen: Add function to get format constants for integers
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@ -724,3 +724,33 @@ pub fn rpc_codegen_callback() -> Arc<GenCall> {
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rpc_codegen_callback_fn(ctx, obj, fun, args, generator)
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})))
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}
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/// Returns the `fprintf` format constant for the given [`llvm_int_t`][`IntType`] on a platform with
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/// [`llvm_usize`] as its native word size.
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///
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/// Note that, similar to format constants in `<inttypes.h>`, these constants need to be prepended
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/// with `%`.
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#[must_use]
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fn get_fprintf_format_constant<'ctx>(
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llvm_usize: IntType<'ctx>,
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llvm_int_t: IntType<'ctx>,
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is_unsigned: bool,
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) -> String {
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debug_assert!(matches!(llvm_usize.get_bit_width(), 8 | 16 | 32 | 64));
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let conv_spec = if is_unsigned { 'u' } else { 'd' };
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// https://en.cppreference.com/w/c/language/arithmetic_types
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// Note that NAC3 does **not** support LP32 and LLP64 configurations
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match llvm_int_t.get_bit_width() {
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8 => format!("hh{conv_spec}"),
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16 => format!("h{conv_spec}"),
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32 => conv_spec.to_string(),
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64 => format!("{}{conv_spec}", if llvm_usize.get_bit_width() == 64 { "l" } else { "ll" }),
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_ => todo!(
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"Not yet implemented for i{} on {}-bit platform",
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llvm_int_t.get_bit_width(),
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llvm_usize.get_bit_width()
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),
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}
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}
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