cb77930d6b
Based on previous discussion on the mailing list, clang currently lacks support for C99 partial re-initialization behavior: Reference: http://lists.cs.uiuc.edu/pipermail/cfe-dev/2013-April/029188.html Reference: http://www.open-std.org/jtc1/sc22/wg14/www/docs/dr_253.htm This patch attempts to fix this problem. Given the following code snippet, struct P1 { char x[6]; }; struct LP1 { struct P1 p1; }; struct LP1 l = { .p1 = { "foo" }, .p1.x[2] = 'x' }; // this example is adapted from the example for "struct fred x[]" in DR-253; // currently clang produces in l: { "\0\0x" }, // whereas gcc 4.8 produces { "fox" }; // with this fix, clang will also produce: { "fox" }; Differential Review: http://reviews.llvm.org/D5789 llvm-svn: 239446
42 lines
1.1 KiB
C
42 lines
1.1 KiB
C
// RUN: %clang_cc1 -analyze -analyzer-checker=debug.DumpCFG %s 2>&1 \
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// RUN: | FileCheck %s
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struct Q { int a, b, c; };
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union UQ { struct Q q; };
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union UQ getUQ() {
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union UQ u = { { 1, 2, 3 } };
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return u;
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}
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void test() {
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struct LUQ { union UQ uq; } var = { getUQ(), .uq.q.a = 100 };
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struct Q s[] = {
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[0] = (struct Q){1, 2},
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[0].c = 3
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};
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}
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// CHECK: void test()
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// CHECK: [B1]
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// CHECK: 1: getUQ
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// CHECK: 2: [B1.1] (ImplicitCastExpr, FunctionToPointerDecay, union UQ (*)())
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// CHECK: 3: [B1.2]()
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// CHECK: 4: 100
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// CHECK: 5: /*no init*/
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// CHECK: 6: /*no init*/
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// CHECK: 7: {[B1.4], [B1.5], [B1.6]}
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// CHECK: 8: {[B1.7]}
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// CHECK: 9: {/*base*/[B1.3], /*updater*/[B1.8]}
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// CHECK: 10: {[B1.3], .uq.q.a = [B1.4]}
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// CHECK: 11: struct LUQ var = {getUQ(), .uq.q.a = 100};
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// CHECK: 12: 1
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// CHECK: 13: 2
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// CHECK: 14: /*implicit*/(int)0
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// CHECK: 15: {[B1.12], [B1.13]}
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// CHECK: 18: /*no init*/
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// CHECK: 19: /*no init*/
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// CHECK: 20: 3
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// CHECK: 21: {[B1.18], [B1.19], [B1.20]}
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// CHECK: 22: {/*base*/[B1.17], /*updater*/[B1.21]}
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// CHECK: 24: struct Q s[] = {[0] = (struct Q){1, 2}, [0].c = 3};
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