4a011ac84f
Currently both True/False counts were folded. It lost the information, "It is True or False before folding." It prevented recalling branch counts in merging template instantiations. In `llvm-cov`, a folded branch is shown as: - `[True: n, Folded]` - `[Folded, False n]` In the case If `n` is zero, a branch is reported as "uncovered". This is distinguished from "folded" branch. When folded branches are merged, `Folded` may be dissolved. In the coverage map, either `Counter` is `Zero`. Currently both were `Zero`. Since "partial fold" has been introduced, either case in `switch` is omitted as `Folded`. Each `case:` in `switch` is reported as `[True: n, Folded]`, since `False` count doesn't show meaningful value. When `switch` doesn't have `default:`, `switch (Cond)` is reported as `[Folded, False: n]`, since `True` count was just the sum of `case`(s). `switch` with `default` can be considered as "the statement that doesn't have any `False`(s)".
51 lines
2.0 KiB
C
51 lines
2.0 KiB
C
// RUN: %clang_cc1 -mllvm -emptyline-comment-coverage=false -fprofile-instrument=clang -fcoverage-mapping -dump-coverage-mapping -emit-llvm-only -main-file-name switchmacro.c %s | FileCheck %s
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#define FOO(x) (void)x
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// CHECK: foo
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int foo(int i) { // CHECK-NEXT: File 0, [[@LINE]]:16 -> {{[0-9]+}}:2 = #0
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switch (i) { // CHECK-NEXT: Gap,File 0, [[@LINE]]:14 -> {{[0-9]+}}:11 = 0
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default: // CHECK-NEXT: File 0, [[@LINE]]:3 -> {{[0-9]+}}:11 = #2
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// CHECK-NEXT: Branch,File 0, [[@LINE-1]]:3 -> [[@LINE-1]]:10 = #2, 0
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if (i == 1) // CHECK-NEXT: File 0, [[@LINE]]:9 -> [[@LINE]]:15 = #2
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// CHECK-NEXT: Branch,File 0, [[@LINE-1]]:9 -> [[@LINE-1]]:15 = #3, (#2 - #3)
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return 0; // CHECK: File 0, [[@LINE]]:7 -> [[@LINE]]:15 = #3
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// CHECK-NEXT: File 0, [[@LINE-1]]:16 -> [[@LINE+3]]:5 = (#2 - #3)
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// CHECK-NEXT: Expansion,File 0, [[@LINE+2]]:5 -> [[@LINE+2]]:8 = (#2 - #3) (Expanded file = 1)
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// CHECK-NEXT: File 0, [[@LINE+1]]:8 -> {{[0-9]+}}:11 = (#2 - #3)
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FOO(1);
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case 0: // CHECK-NEXT: File 0, [[@LINE]]:3 -> [[@LINE+2]]:13 = ((#2 + #4) - #3)
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// CHECK-NEXT: Branch,File 0, [[@LINE-1]]:3 -> [[@LINE-1]]:9 = #4, 0
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return 2; // CHECK-NEXT: Gap,File 0, [[@LINE]]:14 -> [[@LINE+4]]:3 = 0
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// CHECK-NEXT: Expansion,File 0, [[@LINE+2]]:3 -> [[@LINE+2]]:6 = 0
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// CHECK-NEXT: File 0, [[@LINE+1]]:6 -> {{[0-9]+}}:11 = 0
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FOO(1);
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// CHECK-NEXT: File 0, [[@LINE+1]]:3 -> {{[0-9]+}}:11 = #5
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label: ;
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}
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}
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// PR26825 - Crash when exiting macro expansion containing a switch
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// CHECK: bar
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#define START { while (0) { switch (0) {
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#define END }}}
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void bar(void) {
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START // CHECK: File 0, [[@LINE]]:8 -> [[@LINE+2]]:6
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default: ;
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END
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}
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// PR27948 - Crash when handling a switch partially covered by a macro
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// CHECK: baz
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#define START2 switch (0) default:
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void baz(void) {
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for (;;)
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START2 return; // CHECK: Expansion,File 0, [[@LINE]]:5 -> [[@LINE]]:11 = #1 (Expanded file = 1)
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}
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int main(int argc, const char *argv[]) {
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foo(3);
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return 0;
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}
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