[lld] [llvm] [Symbolizer] Support for Missing Line Numbers. (PR #82240)

[David Blaikie via llvm-commits]

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+# REQUIRES: x86-registered-target
+
+# RUN: rm -rf %t && split-file %s %t && cd %t
+# RUN: yaml2obj %s -o %t.o
+# RUN: llvm-symbolizer --obj=%t.o --skip-line-zero 0x34d0 | FileCheck --strict-whitespace --match-full-lines --check-prefix=APPROX-FAIL-ACROSS-SEQ %s
+# RUN: llvm-symbolizer --obj=%t.o --skip-line-zero 0x34f0 | FileCheck --strict-whitespace --match-full-lines --check-prefix=APPROX-WITHIN-SEQ %s
+# RUN: llvm-symbolizer --obj=%t.o --skip-line-zero 0x34f0 0x3517 | FileCheck --strict-whitespace --match-full-lines --check-prefixes=APPROX-WITHIN-SEQ,NO-APPROX %s
+# RUN: llvm-symbolizer --obj=%t.o --skip-line-zero --verbose 0x34f0 | FileCheck --strict-whitespace --match-full-lines --check-prefix=APPROX-VERBOSE %s
+# RUN: llvm-symbolizer --obj=%t.o --skip-line-zero --output-style=JSON 0x34f0 | FileCheck --strict-whitespace --match-full-lines --check-prefix=APPROX-JSON %s
+
+# APPROX-FAIL-ACROSS-SEQ:add
+# APPROX-FAIL-ACROSS-SEQ-NEXT:definitions.h:0:49
+# APPROX-WITHIN-SEQ:main
+# APPROX-WITHIN-SEQ-NEXT:definitions.h:3:39 (approximate)
+# NO-APPROX:main
+# NO-APPROX-NEXT:main.c:9:2
+
+# APPROX-VERBOSE:main
+# APPROX-VERBOSE-NEXT:  Filename: definitions.h
+# APPROX-VERBOSE-NEXT:  Function start address: 0x34f0
+# APPROX-VERBOSE-NEXT:  Line: 3
+# APPROX-VERBOSE-NEXT:  Column: 39
+# APPROX-VERBOSE-NEXT:  Approximate: true
+
+# APPROX-JSON:[{"Address":"0x34f0","ModuleName":"{{.*}}{{[/|\]+}}test{{[/|\]+}}tools{{[/|\]+}}llvm-symbolizer{{[/|\]+}}Output{{[/|\]+}}approximate-line-handcrafted.yaml.tmp.o","Symbol":[{"Approximate":true,"Column":39,"Discriminator":0,"FileName":"definitions.h","FunctionName":"main","Line":3,"StartAddress":"0x34f0","StartFileName":"","StartLine":0}]}]
+
+#--- definitions.h
+#extern inline __attribute__((section(".def_section"))) int dummy_function(){ return 1234; }
+#extern inline int add(int x, int y) { return (x + y); }
+#extern inline int sub(int x, int y) { return (x - y); }
+
+#--- main.c
+#include <stdio.h>
+#include "definitions.h"
+
+#int main(void) {
+ #int a = 10;
+ #int b = 100;
+ #printf("Dummy Function: %d \n",dummy_function());
+ #printf("Addition result: %d \n", add(a, b));
+ #printf("Subtraction result: %d \n", sub(a, b));
+ #return 0;
+#}
+
+#--- gen
+#clang -S -O3 -gline-tables-only --target=x86_64-pc-linux -fdebug-prefix-map=/proc/self/cwd="" -fdebug-prefix-map=./="" main.c  -o main.s
+#sed -i '31s/ 2 / 0 /g' main.s
+#sed -i '64s/ 4 / 0 /g' main.s
+#clang -O3  -Wl,--section-start=.def_section=0x1000 -fdebug-prefix-map=/proc/self/cwd="" -fdebug-prefix-map=./="" -gline-tables-only --target=x86_64-pc-linux main.s -o main.o
+#obj2yaml main.o -o -
+
+#--- main.yaml
----------------
dwblaikie wrote:

Can we skip the yaml in this case, and use assembly?

https://github.com/llvm/llvm-project/pull/82240