coverage: ensure definition line is also counted

Closes #36825

Author: vtjnash

src/codegen.cpp

@@ -6532,6 +6532,13 @@ static std::pair<std::unique_ptr<Module>, jl_llvm_functions_t>
     Value *sync_bytes = nullptr;
     if (do_malloc_log(true))
         sync_bytes = ctx.builder.CreateCall(prepare_call(diff_gc_total_bytes_func), {});
+    { // coverage for the function definition line number
+        const auto &topinfo = linetable.at(0);
+        if (topinfo == linetable.at(1))
+            current_lineinfo.push_back(1);
+        if (do_coverage(topinfo.is_user_code))
+            coverageVisitLine(ctx, topinfo.file, topinfo.line);
+    }
 
     find_next_stmt(0);
     while (cursor != -1) {

test/cmdlineargs.jl

@@ -258,7 +258,9 @@ let exename = `$(Base.julia_cmd()) --startup-file=no`
     mktempdir() do dir
         helperdir = joinpath(@__DIR__, "testhelpers")
         inputfile = joinpath(helperdir, "coverage_file.jl")
-        expected = replace(read(joinpath(helperdir, "coverage_file.info"), String),
+        expected = replace(read(joinpath(helperdir, "coverage_file.info.bad"), String),
+            "<FILENAME>" => realpath(inputfile))
+        expected_good = replace(read(joinpath(helperdir, "coverage_file.info"), String),
             "<FILENAME>" => realpath(inputfile))
         covfile = replace(joinpath(dir, "coverage.info"), "%" => "%%")
         @test !isfile(covfile)
@@ -276,18 +278,21 @@ let exename = `$(Base.julia_cmd()) --startup-file=no`
         got = read(covfile, String)
         rm(covfile)
         @test occursin(expected, got) || (expected, got)
+        @test_broken occursin(expected_good, got)
         @test readchomp(`$exename -E "Base.JLOptions().code_coverage" -L $inputfile
             --code-coverage=$covfile --code-coverage=user`) == "1"
         @test isfile(covfile)
         got = read(covfile, String)
         rm(covfile)
         @test occursin(expected, got) || (expected, got)
+        @test_broken occursin(expected_good, got)
         @test readchomp(`$exename -E "Base.JLOptions().code_coverage" -L $inputfile
             --code-coverage=$covfile --code-coverage=all`) == "2"
         @test isfile(covfile)
         got = read(covfile, String)
         rm(covfile)
         @test occursin(expected, got) || (expected, got)
+        @test_broken occursin(expected_good, got)
     end
 
     # --track-allocation

test/testhelpers/coverage_file.info

@@ -1,4 +1,5 @@
 SF:<FILENAME>
+DA:3,1
 DA:4,1
 DA:5,0
 DA:7,1
@@ -8,6 +9,9 @@ DA:11,1
 DA:12,1
 DA:14,0
 DA:17,1
-LH:7
-LF:9
+DA:19,1
+DA:20,1
+DA:22,1
+LH:10
+LF:13
 end_of_record

test/testhelpers/coverage_file.info.bad

@@ -0,0 +1,19 @@
+SF:<FILENAME>
+DA:3,1
+DA:4,1
+DA:5,0
+DA:7,1
+DA:8,1
+DA:9,5
+DA:11,1
+DA:12,1
+DA:14,0
+DA:17,1
+DA:18,0
+DA:19,1
+DA:20,1
+DA:22,1
+DA:1234,0
+LH:11
+LF:15
+end_of_record

test/testhelpers/coverage_file.jl

@@ -14,7 +14,13 @@ function code_coverage_test()
     not_reached
 end
 
-short_form_func_coverage_test(x) = x*x
+@eval short_form_func_coverage_test(x) = begin
+    $(Expr(:line, 1234))
+    y() = begin
+        x
+    end
+    x * y()
+end
 
 success = code_coverage_test() == [1, 2, 3] &&
           short_form_func_coverage_test(2) == 4