PR14492: Debug Info: Support for values of non-integer non-type template parameters.

This is only tested for global variables at the moment (& includes tests
for the unnamed parameter case, since apparently this entire function
was completely untested previously)

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@181632 91177308-0d34-0410-b5e6-96231b3b80d8

1 files changed, 84 insertions, 0 deletions

diff --git a/test/DebugInfo/template.ll b/test/DebugInfo/template.ll
new file mode 100644
index 0000000..4717355
--- /dev/null
+++ b/test/DebugInfo/template.ll
@@ -0,0 +1,84 @@
+; REQUIRES: object-emission
+
+; RUN: llc -O0 -filetype=obj < %s > %t
+; RUN: llvm-dwarfdump %t | FileCheck %s
+
+; IR generated with `clang++ -g -emit-llvm -S` from the following code:
+; template<int, int* x>  func() { }
+; int glbl = func<3, &glbl>();
+
+; CHECK: [[INT:0x[0-9a-f]*]]:{{ *}}DW_TAG_base_type
+; CHECK-NEXT: DW_AT_name{{.*}} = "int"
+
+; CHECK: DW_AT_name{{.*}}"func<3, &glbl>"
+; CHECK-NOT: NULL
+; CHECK: DW_TAG_template_value_parameter
+; CHECK-NEXT: DW_AT_type{{.*}}=> {[[INT]]}
+; CHECK-NEXT: DW_AT_name{{.*}}= "x"
+
+; This could be made shorter by encoding it as _sdata rather than data4, or
+; even as data1. DWARF strongly urges implementations to prefer 
+; _sdata/_udata rather than dataN
+
+; CHECK-NEXT: DW_AT_const_value [DW_FORM_data4]{{.*}}(0x00000003)
+
+; CHECK: DW_TAG_template_value_parameter
+; CHECK-NEXT: DW_AT_type{{.*}}=> {[[INTPTR:0x[0-9a-f]*]]}
+
+; The address of the global 'glbl', followed by DW_OP_stack_value (9f), to use
+; the value immediately, rather than indirecting through the address.
+
+; CHECK-NEXT: DW_AT_location [DW_FORM_block1]{{ *}}(<0x0a> 03 00 00 00 00 00 00 00 00 9f )
+
+; CHECK: [[INTPTR]]:{{ *}}DW_TAG_pointer_type
+; CHECK-NEXT: DW_AT_type{{.*}} => {[[INT]]}
+
+@glbl = global i32 0, align 4
+@llvm.global_ctors = appending global [1 x { i32, void ()* }] [{ i32, void ()* } { i32 65535, void ()* @_GLOBAL__I_a }]
+
+define internal void @__cxx_global_var_init() section ".text.startup" {
+entry:
+  %call = call i32 @_Z4funcILi3EXadL_Z4glblEEEiv(), !dbg !20
+  store i32 %call, i32* @glbl, align 4, !dbg !20
+  ret void, !dbg !20
+}
+
+; Function Attrs: nounwind uwtable
+define linkonce_odr i32 @_Z4funcILi3EXadL_Z4glblEEEiv() #0 {
+entry:
+  ret i32 3, !dbg !21
+}
+
+define internal void @_GLOBAL__I_a() section ".text.startup" {
+entry:
+  call void @__cxx_global_var_init(), !dbg !22
+  ret void, !dbg !22
+}
+
+attributes #0 = { nounwind uwtable "less-precise-fpmad"="false" "no-frame-pointer-elim"="true" "no-frame-pointer-elim-non-leaf"="true" "no-infs-fp-math"="false" "no-nans-fp-math"="false" "unsafe-fp-math"="false" "use-soft-float"="false" }
+
+!llvm.dbg.cu = !{!0}
+
+!0 = metadata !{i32 786449, metadata !1, i32 4, metadata !"clang version 3.4 ", i1 false, metadata !"", i32 0, metadata !2, metadata !2, metadata !3, metadata !18, metadata !2, metadata !""} ; [ DW_TAG_compile_unit ] [/usr/local/google/home/blaikie/dev/scratch/templ.cpp] [DW_LANG_C_plus_plus]
+!1 = metadata !{metadata !"templ.cpp", metadata !"/usr/local/google/home/blaikie/dev/scratch"}
+!2 = metadata !{i32 0}
+!3 = metadata !{metadata !4, metadata !8, metadata !16}
+!4 = metadata !{i32 786478, metadata !1, metadata !5, metadata !"__cxx_global_var_init", metadata !"__cxx_global_var_init", metadata !"", i32 2, metadata !6, i1 true, i1 true, i32 0, i32 0, null, i32 256, i1 false, void ()* @__cxx_global_var_init, null, null, metadata !2, i32 2} ; [ DW_TAG_subprogram ] [line 2] [local] [def] [__cxx_global_var_init]
+!5 = metadata !{i32 786473, metadata !1}          ; [ DW_TAG_file_type ] [/usr/local/google/home/blaikie/dev/scratch/templ.cpp]
+!6 = metadata !{i32 786453, i32 0, i32 0, metadata !"", i32 0, i64 0, i64 0, i64 0, i32 0, null, metadata !7, i32 0, i32 0} ; [ DW_TAG_subroutine_type ] [line 0, size 0, align 0, offset 0] [from ]
+!7 = metadata !{null}
+!8 = metadata !{i32 786478, metadata !1, metadata !5, metadata !"func<3, &glbl>", metadata !"func<3, &glbl>", metadata !"_Z4funcILi3EXadL_Z4glblEEEiv", i32 1, metadata !9, i1 false, i1 true, i32 0, i32 0, null, i32 256, i1 false, i32 ()* @_Z4funcILi3EXadL_Z4glblEEEiv, metadata !12, null, metadata !2, i32 1} ; [ DW_TAG_subprogram ] [line 1] [def] [func<3, &glbl>]
+!9 = metadata !{i32 786453, i32 0, i32 0, metadata !"", i32 0, i64 0, i64 0, i64 0, i32 0, null, metadata !10, i32 0, i32 0} ; [ DW_TAG_subroutine_type ] [line 0, size 0, align 0, offset 0] [from ]
+!10 = metadata !{metadata !11}
+!11 = metadata !{i32 786468, null, null, metadata !"int", i32 0, i64 32, i64 32, i64 0, i32 0, i32 5} ; [ DW_TAG_base_type ] [int] [line 0, size 32, align 32, offset 0, enc DW_ATE_signed]
+!12 = metadata !{metadata !13, metadata !14}
+!13 = metadata !{i32 786480, null, metadata !"x", metadata !11, i32 3, null, i32 0, i32 0} ; [ DW_TAG_template_value_parameter ]
+!14 = metadata !{i32 786480, null, metadata !"", metadata !15, i32* @glbl, null, i32 0, i32 0} ; [ DW_TAG_template_value_parameter ]
+!15 = metadata !{i32 786447, null, null, metadata !"", i32 0, i64 64, i64 64, i64 0, i32 0, metadata !11} ; [ DW_TAG_pointer_type ] [line 0, size 64, align 64, offset 0] [from int]
+!16 = metadata !{i32 786478, metadata !1, metadata !5, metadata !"_GLOBAL__I_a", metadata !"_GLOBAL__I_a", metadata !"", i32 1, metadata !17, i1 true, i1 true, i32 0, i32 0, null, i32 64, i1 false, void ()* @_GLOBAL__I_a, null, null, metadata !2, i32 1} ; [ DW_TAG_subprogram ] [line 1] [local] [def] [_GLOBAL__I_a]
+!17 = metadata !{i32 786453, i32 0, i32 0, metadata !"", i32 0, i64 0, i64 0, i64 0, i32 0, null, metadata !2, i32 0, i32 0} ; [ DW_TAG_subroutine_type ] [line 0, size 0, align 0, offset 0] [from ]
+!18 = metadata !{metadata !19}
+!19 = metadata !{i32 786484, i32 0, null, metadata !"glbl", metadata !"glbl", metadata !"", metadata !5, i32 2, metadata !11, i32 0, i32 1, i32* @glbl, null} ; [ DW_TAG_variable ] [glbl] [line 2] [def]
+!20 = metadata !{i32 2, i32 0, metadata !4, null}
+!21 = metadata !{i32 1, i32 0, metadata !8, null}
+!22 = metadata !{i32 1, i32 0, metadata !16, null}