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https://github.com/Gericom/teak-llvm.git
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8c892b556f
Currently, the constexpr evaluator is very conservative about unmodeled side-effects when we're evaluating an expression in a mode that allows such side-effects. This patch makes us note when we might have actually encountered an unmodeled side-effect, which allows us to be more accurate when we know an unmodeled side-effect couldn't have occurred. This patch has been split into two commits; this one primarily introduces the bits necessary to track whether we might have potentially hit such a side-effect. The one that actually does the tracking (which boils down to more or less a rename of keepEvaluatingAfterFailure to noteFailure) is coming soon. Differential Revision: http://reviews.llvm.org/D18540 llvm-svn: 270781
100 lines
2.3 KiB
C++
100 lines
2.3 KiB
C++
// RUN: %clang_cc1 -fsyntax-only -verify -std=c++14 %s
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namespace basic {
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// Ensuring that __bos can be used in constexpr functions without anything
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// sketchy going on...
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constexpr int bos0() {
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int k = 5;
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char cs[10] = {};
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return __builtin_object_size(&cs[k], 0);
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}
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constexpr int bos1() {
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int k = 5;
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char cs[10] = {};
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return __builtin_object_size(&cs[k], 1);
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}
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constexpr int bos2() {
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int k = 5;
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char cs[10] = {};
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return __builtin_object_size(&cs[k], 2);
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}
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constexpr int bos3() {
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int k = 5;
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char cs[10] = {};
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return __builtin_object_size(&cs[k], 3);
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}
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static_assert(bos0() == sizeof(char) * 5, "");
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static_assert(bos1() == sizeof(char) * 5, "");
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static_assert(bos2() == sizeof(char) * 5, "");
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static_assert(bos3() == sizeof(char) * 5, "");
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}
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namespace in_enable_if {
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// The code that prompted these changes was __bos in enable_if
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void copy5CharsInto(char *buf) // expected-note{{candidate}}
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__attribute__((enable_if(__builtin_object_size(buf, 0) != -1 &&
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__builtin_object_size(buf, 0) > 5,
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"")));
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// We use different EvalModes for __bos with type 0 versus 1. Ensure 1 works,
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// too...
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void copy5CharsIntoStrict(char *buf) // expected-note{{candidate}}
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__attribute__((enable_if(__builtin_object_size(buf, 1) != -1 &&
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__builtin_object_size(buf, 1) > 5,
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"")));
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struct LargeStruct {
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int pad;
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char buf[6];
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int pad2;
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};
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struct SmallStruct {
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int pad;
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char buf[5];
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int pad2;
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};
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void noWriteToBuf() {
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char buf[6];
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copy5CharsInto(buf);
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LargeStruct large;
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copy5CharsIntoStrict(large.buf);
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}
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void initTheBuf() {
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char buf[6] = {};
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copy5CharsInto(buf);
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LargeStruct large = {0, {}, 0};
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copy5CharsIntoStrict(large.buf);
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}
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int getI();
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void initTheBufWithALoop() {
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char buf[6] = {};
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for (unsigned I = getI(); I != sizeof(buf); ++I)
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buf[I] = I;
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copy5CharsInto(buf);
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LargeStruct large;
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for (unsigned I = getI(); I != sizeof(buf); ++I)
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large.buf[I] = I;
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copy5CharsIntoStrict(large.buf);
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}
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void tooSmallBuf() {
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char buf[5];
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copy5CharsInto(buf); // expected-error{{no matching function for call}}
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SmallStruct small;
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copy5CharsIntoStrict(small.buf); // expected-error{{no matching function for call}}
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}
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}
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