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Import Alan's testcase from llvm#78819 
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‎llvm/test/tools/llvm-cov/Inputs/mcdc-macro.c

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#define C c
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#define D 1
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#define E (C != a) && (C > a)
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#define F E
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void __attribute__((noinline)) func1(void) { return; }
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void __attribute__((noinline)) func(int a, int b, int c) {
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if (a && D && E || b)
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func1();
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if (b && D)
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func1();
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if (a && (b && C) || (D && F))
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func1();
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}
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int main() {
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func(2, 3, 3);
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return 0;
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}

‎llvm/test/tools/llvm-cov/Inputs/mcdc-macro.o

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‎llvm/test/tools/llvm-cov/Inputs/mcdc-macro.proftext

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main
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# Func Hash:
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24
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# Num Counters:
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1
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# Counter Values:
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1
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foo
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# Func Hash:
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395201011017399473
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# Num Counters:
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# Counter Values:
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# Num Bitmap Bytes:
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$13
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# Bitmap Byte Values:
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0x0
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bar
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# Func Hash:
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24
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# Num Counters:
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1
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# Counter Values:
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3
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‎llvm/test/tools/llvm-cov/mcdc-macro.test

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// Test visualization of MC/DC constructs for branches in macro expansions.
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// RUN: llvm-profdata merge %S/Inputs/mcdc-macro.proftext -o %t.profdata
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// RUN: llvm-cov show --show-expansions --show-branches=count --show-mcdc %S/Inputs/mcdc-macro.o -instr-profile %t.profdata -path-equivalence=/tmp,%S/Inputs %S/Inputs/mcdc-macro.c | FileCheck %s
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// CHECK: | | | Branch (2:11): [Folded - Ignored]
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// CHECK: | | | Branch (3:11): [True: 0, False: 0]
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// CHECK: | | | Branch (3:23): [True: 0, False: 0]
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// CHECK: | Branch (9:7): [True: 0, False: 0]
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// CHECK-NEXT: | Branch (9:22): [True: 0, False: 0]
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// CHECK-NEXT: ------------------
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// CHECK-NEXT: |---> MC/DC Decision Region (9:7) to (9:23)
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// CHECK-NEXT: |
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// CHECK-NEXT: | Number of Conditions: 5
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// CHECK-NEXT: | Condition C1 --> (9:7)
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// CHECK-NEXT: | Condition C2 --> (2:11)
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// CHECK-NEXT: | Condition C3 --> (3:11)
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// CHECK-NEXT: | Condition C4 --> (3:23)
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// CHECK-NEXT: | Condition C5 --> (9:22)
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// CHECK-NEXT: |
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// CHECK-NEXT: | Executed MC/DC Test Vectors:
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// CHECK-NEXT: |
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// CHECK-NEXT: | None.
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// CHECK-NEXT: |
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// CHECK-NEXT: | C1-Pair: not covered
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// CHECK-NEXT: | C2-Pair: constant folded
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// CHECK-NEXT: | C3-Pair: not covered
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// CHECK-NEXT: | C4-Pair: not covered
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// CHECK-NEXT: | C5-Pair: not covered
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// CHECK-NEXT: | MC/DC Coverage for Decision: 0.00%
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// CHECK-NEXT: |
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// CHECK-NEXT: ------------------
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// CHECK: | | | Branch (2:11): [Folded - Ignored]
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// CHECK: | Branch (11:7): [True: 0, False: 0]
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// CHECK-NEXT: ------------------
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// CHECK-NEXT: |---> MC/DC Decision Region (11:7) to (11:13)
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// CHECK-NEXT: |
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// CHECK-NEXT: | Number of Conditions: 2
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// CHECK-NEXT: | Condition C1 --> (11:7)
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// CHECK-NEXT: | Condition C2 --> (2:11)
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// CHECK-NEXT: |
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// CHECK-NEXT: | Executed MC/DC Test Vectors:
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// CHECK-NEXT: |
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// CHECK-NEXT: | None.
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// CHECK-NEXT: |
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// CHECK-NEXT: | C1-Pair: not covered
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// CHECK-NEXT: | C2-Pair: constant folded
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// CHECK-NEXT: | MC/DC Coverage for Decision: 0.00%
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// CHECK-NEXT: |
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// CHECK-NEXT: ------------------
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// CHECK: | | | Branch (1:11): [True: 0, False: 0]
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// CHECK: | | | Branch (2:11): [Folded - Ignored]
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// CHECK: | | | | | Branch (3:11): [True: 0, False: 0]
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// CHECK: | | | | | Branch (3:23): [True: 0, False: 0]
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// CHECK: | Branch (13:7): [True: 0, False: 0]
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// CHECK-NEXT: | Branch (13:13): [True: 0, False: 0]
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// CHECK-NEXT: ------------------
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// CHECK-NEXT: |---> MC/DC Decision Region (13:7) to (13:32)
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// CHECK-NEXT: |
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// CHECK-NEXT: | Number of Conditions: 6
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// CHECK-NEXT: | Condition C1 --> (13:7)
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// CHECK-NEXT: | Condition C2 --> (13:13)
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// CHECK-NEXT: | Condition C3 --> (1:11)
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// CHECK-NEXT: | Condition C4 --> (2:11)
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// CHECK-NEXT: | Condition C5 --> (3:11)
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// CHECK-NEXT: | Condition C6 --> (3:23)
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// CHECK-NEXT: |
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// CHECK-NEXT: | Executed MC/DC Test Vectors:
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// CHECK-NEXT: |
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// CHECK-NEXT: | None.
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// CHECK-NEXT: |
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// CHECK-NEXT: | C1-Pair: not covered
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// CHECK-NEXT: | C2-Pair: not covered
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// CHECK-NEXT: | C3-Pair: not covered
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// CHECK-NEXT: | C4-Pair: constant folded
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// CHECK-NEXT: | C5-Pair: not covered
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// CHECK-NEXT: | C6-Pair: not covered
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// CHECK-NEXT: | MC/DC Coverage for Decision: 0.00%
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// CHECK-NEXT: |
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// CHECK-NEXT: ------------------
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Instructions for regenerating the test:
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# cd %S/Inputs
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cp mcdc-macro.c /tmp
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clang -fcoverage-mcdc -fprofile-instr-generate -fcoverage-compilation-dir=. \
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-fcoverage-mapping /tmp/mcdc-macro.c -o /tmp/mcdc-macro.o
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mv /tmp/mcdc-macro.o %S/Inputs

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