49 lines
2.7 KiB
C
49 lines
2.7 KiB
C
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// RUN: %clang_cc1 %s -verify -fsyntax-only -pedantic
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// This file tests the clang extension which allows initializing the components
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// of a complex number individually using an initialization list. Basically,
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// if you have an explicit init list for a complex number that contains two
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// initializers, this extension kicks in to turn it into component-wise
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// initialization.
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//
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// This extension is useful because there isn't any way to accurately build
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// a complex number at the moment besides setting the components with
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// __real__ and __imag__, which is inconvenient and not usable for constants.
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// (Of course, there are other extensions we could implement that would
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// allow this, like some sort of __builtin_build_complex.)
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//
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// FIXME: It would be a good idea to have a warnings for implicit
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// real->complex and complex->real conversions; as-is, it's way too easy
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// to get implicit conversions when they are not intended.
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// Basic testcase
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_Complex float valid1 = { 1.0f, 2.0f }; // expected-warning {{specifying real and imaginary components is an extension}}
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// Struct for nesting tests
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struct teststruct { _Complex float x; };
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// Random other valid stuff
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_Complex int valid2 = { 1, 2 }; // expected-warning {{complex integer}} expected-warning {{specifying real and imaginary components is an extension}}
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struct teststruct valid3 = { { 1.0f, 2.0f} }; // expected-warning {{specifying real and imaginary components is an extension}}
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_Complex float valid4[2] = { {1.0f, 1.0f}, {1.0f, 1.0f} }; // expected-warning 2 {{specifying real and imaginary components is an extension}}
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// FIXME: We need some sort of warning for valid5
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_Complex float valid5 = {1.0f, 1.0fi}; // expected-warning {{imaginary constants}} expected-warning {{specifying real and imaginary components is an extension}}
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// Random invalid stuff
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struct teststruct invalid1 = { 1, 2 }; // expected-warning {{excess elements}}
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_Complex float invalid2 = { 1, 2, 3 }; // expected-warning {{excess elements}}
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_Complex float invalid3 = {}; // expected-error {{scalar initializer cannot be empty}} expected-warning {{GNU empty initializer}}
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// Check incomplete array sizing
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_Complex float sizetest1[] = { {1.0f, 1.0f}, {1.0f, 1.0f} }; // expected-warning 2 {{specifying real and imaginary components is an extension}}
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_Complex float sizecheck1[(sizeof(sizetest1) == sizeof(*sizetest1)*2) ? 1 : -1];
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_Complex float sizetest2[] = { 1.0f, 1.0f, {1.0f, 1.0f} }; // expected-warning {{specifying real and imaginary components is an extension}}
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_Complex float sizecheck2[(sizeof(sizetest2) == sizeof(*sizetest2)*3) ? 1 : -1];
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// Constant-folding with init list.
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_Complex float x = 2 + (_Complex float) { 1, 2 }; // expected-warning {{specifying real and imaginary components is an extension}}
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