41c6e43792
This commit implements the entirety of the now-accepted [N3017
-Preprocessor
Embed](https://www.open-std.org/jtc1/sc22/wg14/www/docs/n3017.htm) and
its sister C++ paper [p1967](https://wg21.link/p1967). It implements
everything in the specification, and includes an implementation that
drastically improves the time it takes to embed data in specific
scenarios (the initialization of character type arrays). The mechanisms
used to do this are used under the "as-if" rule, and in general when the
system cannot detect it is initializing an array object in a variable
declaration, will generate EmbedExpr AST node which will be expanded by
AST consumers (CodeGen or constant expression evaluators) or expand
embed directive as a comma expression.
This reverts commit
682d461d5a.
---------
Co-authored-by: The Phantom Derpstorm <phdofthehouse@gmail.com>
Co-authored-by: Aaron Ballman <aaron@aaronballman.com>
Co-authored-by: cor3ntin <corentinjabot@gmail.com>
Co-authored-by: H. Vetinari <h.vetinari@gmx.com>
39 lines
1.1 KiB
C
39 lines
1.1 KiB
C
// RUN: %clang_cc1 -std=c23 %s --embed-dir=%S/Inputs -fsyntax-only -verify
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const char data[] = {
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#embed <single_byte.txt> prefix('\xA', )
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};
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const char empty_data[] = {
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#embed <media/empty> prefix('\xA', )
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1
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};
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static_assert(sizeof(data) == 2);
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static_assert('\xA' == data[0]);
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static_assert('b' == data[1]);
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static_assert(sizeof(empty_data) == 1);
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static_assert(1 == empty_data[0]);
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struct S {
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int x, y, z;
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};
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const struct S s = {
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#embed <single_byte.txt> prefix( .x = 100, .y = 10, )
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};
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static_assert(s.x == 100);
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static_assert(s.y == 10);
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static_assert(s.z == 'b');
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// Ensure that an empty file does not produce any prefix tokens. If it did,
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// there would be random tokens here that the parser would trip on.
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#embed <media/empty> prefix(0)
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// Ensure we diagnose duplicate parameters even if they're the same value.
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const unsigned char a[] = {
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#embed <jk.txt> prefix(1,) limit(1) prefix(1,)
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// expected-error@-1 {{cannot specify parameter 'prefix' twice in the same '#embed' directive}}
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,
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#embed <jk.txt> prefix(1,) if_empty() prefix(2,)
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// expected-error@-1 {{cannot specify parameter 'prefix' twice in the same '#embed' directive}}
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};
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