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1Consider this example program with an inline function "foo":2 3==> foo.h <==4extern int global;5__inline void foo() {6 ++global;7}8void bar();9==> pdb_comdat_main.c <==10#include "foo.h"11int main(void) {12 foo();13 bar();14 return 42;15}16==> pdb_comdat_bar.c <==17#include "foo.h"18void bar(void) {19 foo();20}21 22Both object files will contain debug info for foo, but only the debug info from23pdb_comdat_main.obj should be included in the PDB.24 25RUN: rm -rf %t && mkdir -p %t && cd %t26RUN: yaml2obj %S/Inputs/pdb_comdat_main.yaml -o pdb_comdat_main.obj27RUN: yaml2obj %S/Inputs/pdb_comdat_bar.yaml -o pdb_comdat_bar.obj28RUN: lld-link pdb_comdat_main.obj pdb_comdat_bar.obj -out:%t.exe -debug -pdb:%t.pdb -nodefaultlib -entry:main29RUN: llvm-pdbutil dump -l -symbols -globals %t.pdb | FileCheck %s30 31CHECK: Lines32CHECK: ============================================================33CHECK-LABEL: Mod 0000 | `{{.*}}pdb_comdat_main.obj`:34CHECK: c:\src\llvm-project\build\pdb_comdat_main.c (MD5: F969E51BBE373436D81492EB61387F36)35CHECK: c:\src\llvm-project\build\foo.h (MD5: D74D834EFAC3AE2B45E606A8320B1D5C)36CHECK-LABEL: Mod 0001 | `{{.*}}pdb_comdat_bar.obj`:37CHECK: c:\src\llvm-project\build\pdb_comdat_bar.c (MD5: 365279DB4FCBEDD721BBFC3B14A953C2)38CHECK-NOT: c:\src\llvm-project\build\foo.h39CHECK-LABEL: Mod 0002 | `* Linker *`:40 41CHECK-LABEL: Global Symbols42CHECK-NEXT: ============================================================43CHECK-NEXT: Records44CHECK-NEXT: 84 | S_PROCREF [size = 20] `main`45CHECK-NEXT: module = 1, sum name = 0, offset = 12046CHECK-NEXT: 148 | S_PROCREF [size = 20] `bar`47CHECK-NEXT: module = 2, sum name = 0, offset = 12048CHECK-NEXT: 128 | S_PROCREF [size = 20] `foo`49CHECK-NEXT: module = 1, sum name = 0, offset = 20850CHECK-NEXT: 104 | S_GDATA32 [size = 24] `global`51CHECK-NEXT: type = 0x0074 (int), addr = 0003:000052CHECK-NEXT: 168 | S_GDATA32 [size = 24] `global`53CHECK-NEXT: type = 0x0074 (int), addr = 0003:000054 55CHECK: Symbols56CHECK: ============================================================57CHECK-LABEL: Mod 0000 | `{{.*}}pdb_comdat_main.obj`:58CHECK: 4 | S_OBJNAME [size = 56] sig=0, `C:\src\llvm-project\build\pdb_comdat_main.obj`59CHECK: 60 | S_COMPILE3 [size = 60]60CHECK: machine = intel x86-x64, Ver = Microsoft (R) Optimizing Compiler, language = c61CHECK: frontend = 19.0.24215.1, backend = 19.0.24215.162CHECK: flags = security checks | hot patchable63CHECK: 120 | S_GPROC32 [size = 44] `main`64CHECK: parent = 0, end = 196, addr = 0001:0000, code size = 2465CHECK: debug start = 4, debug end = 19, flags = none66CHECK: 164 | S_FRAMEPROC [size = 32]67CHECK: size = 40, padding size = 0, offset to padding = 068CHECK: bytes of callee saved registers = 0, exception handler addr = 0000:000069CHECK: flags = has async eh | opt speed70CHECK: 196 | S_END [size = 4]71CHECK: 200 | S_BUILDINFO [size = 8] BuildId = `0x100A`72CHECK: 208 | S_GPROC32 [size = 44] `foo`73CHECK: parent = 0, end = 284, addr = 0001:0032, code size = 1574CHECK: debug start = 0, debug end = 14, flags = none75CHECK: 252 | S_FRAMEPROC [size = 32]76CHECK: size = 0, padding size = 0, offset to padding = 077CHECK: bytes of callee saved registers = 0, exception handler addr = 0000:000078CHECK: flags = marked inline | has async eh | opt speed79CHECK: 284 | S_END [size = 4]80CHECK-LABEL: Mod 0001 | `{{.*}}pdb_comdat_bar.obj`:81CHECK: 4 | S_OBJNAME [size = 56] sig=0, `C:\src\llvm-project\build\pdb_comdat_bar.obj`82CHECK: 60 | S_COMPILE3 [size = 60]83CHECK: machine = intel x86-x64, Ver = Microsoft (R) Optimizing Compiler, language = c84CHECK: frontend = 19.0.24215.1, backend = 19.0.24215.185CHECK: flags = security checks | hot patchable86CHECK: 120 | S_GPROC32 [size = 44] `bar`87CHECK: parent = 0, end = 196, addr = 0001:0048, code size = 1488CHECK: debug start = 4, debug end = 9, flags = none89CHECK: 164 | S_FRAMEPROC [size = 32]90CHECK: size = 40, padding size = 0, offset to padding = 091CHECK: bytes of callee saved registers = 0, exception handler addr = 0000:000092CHECK: flags = has async eh | opt speed93CHECK: 196 | S_END [size = 4]94CHECK: 200 | S_BUILDINFO [size = 8] BuildId = `0x100D`95CHECK-NOT: S_GPROC32 {{.*}} `foo`96CHECK-LABEL: Mod 0002 | `* Linker *`:97 98Reorder the object files and verify that the other table is selected.99 100RUN: lld-link pdb_comdat_bar.obj pdb_comdat_main.obj -out:t.exe -debug -pdb:t.pdb -nodefaultlib -entry:main101RUN: llvm-pdbutil dump -l t.pdb | FileCheck %s --check-prefix=REORDER102 103REORDER-LABEL: Mod 0000 | `{{.*}}pdb_comdat_bar.obj`:104REORDER: c:\src\llvm-project\build\pdb_comdat_bar.c (MD5: 365279DB4FCBEDD721BBFC3B14A953C2)105REORDER: c:\src\llvm-project\build\foo.h (MD5: D74D834EFAC3AE2B45E606A8320B1D5C)106REORDER-LABEL: Mod 0001 | `{{.*}}pdb_comdat_main.obj`:107REORDER: c:\src\llvm-project\build\pdb_comdat_main.c108REORDER-NOT: c:\src\llvm-project\build\foo.h109REORDER-LABEL: Mod 0002 | `* Linker *`:110 111Make sure that we don't crash on non-prevailing debug sections if -debug is not enabled.112RUN: lld-link pdb_comdat_main.obj pdb_comdat_bar.obj -out:%t.exe -nodefaultlib -entry:main113