36cb7477d1
Currently variables appearing inside private/firstprivate/lastprivate
clause of openmp task construct are not visible inside lldb debugger.
This is because compiler does not generate debug info for it.
Please consider the testcase debug_private.c attached with patch.
```
28 #pragma omp task shared(res) private(priv1, priv2) firstprivate(fpriv)
29 {
30 priv1 = n;
31 priv2 = n + 2;
32 printf("Task n=%d,priv1=%d,priv2=%d,fpriv=%d\n",n,priv1,priv2,fpriv);
33
-> 34 res = priv1 + priv2 + fpriv + foo(n - 1);
35 }
36 #pragma omp taskwait
37 return res;
(lldb) p priv1
error: <user expression 0>:1:1: use of undeclared identifier 'priv1'
priv1
^
(lldb) p priv2
error: <user expression 1>:1:1: use of undeclared identifier 'priv2'
priv2
^
(lldb) p fpriv
error: <user expression 2>:1:1: use of undeclared identifier 'fpriv'
fpriv
^
```
After the current patch, lldb is able to show the variables
```
(lldb) p priv1
(int) $0 = 10
(lldb) p priv2
(int) $1 = 12
(lldb) p fpriv
(int) $2 = 14
```
Reviewed By: djtodoro
Differential Revision: https://reviews.llvm.org/D114504
46 lines
1.4 KiB
C
46 lines
1.4 KiB
C
// This testcase checks emission of debug info for variables inside
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// private/firstprivate/lastprivate.
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// REQUIRES: x86_64-linux
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// RUN: %clang_cc1 -debug-info-kind=constructor -x c -verify -triple x86_64-pc-linux-gnu -fopenmp -emit-llvm %s -o - | FileCheck %s
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// expected-no-diagnostics
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// CHECK: define internal i32 @.omp_task_entry.
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// CHECK: call void @llvm.dbg.declare(metadata i32** %.priv.ptr.addr.i, metadata [[PRIV1:![0-9]+]], metadata !DIExpression(DW_OP_deref))
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// CHECK: call void @llvm.dbg.declare(metadata i32** %.priv.ptr.addr1.i, metadata [[PRIV2:![0-9]+]], metadata !DIExpression(DW_OP_deref))
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// CHECK: call void @llvm.dbg.declare(metadata i32** %.firstpriv.ptr.addr.i, metadata [[FPRIV:![0-9]+]], metadata !DIExpression(DW_OP_deref))
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// CHECK: [[PRIV1]] = !DILocalVariable(name: "priv1"
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// CHECK: [[PRIV2]] = !DILocalVariable(name: "priv2"
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// CHECK: [[FPRIV]] = !DILocalVariable(name: "fpriv"
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extern int printf(const char *, ...);
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int foo(int n) {
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int res, priv1, priv2, fpriv;
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fpriv = n + 4;
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if (n < 2)
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return n;
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else {
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#pragma omp task shared(res) private(priv1, priv2) firstprivate(fpriv)
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{
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priv1 = n;
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priv2 = n + 2;
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printf("Task n=%d,priv1=%d,priv2=%d,fpriv=%d\n", n, priv1, priv2, fpriv);
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res = priv1 + priv2 + fpriv + foo(n - 1);
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}
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#pragma omp taskwait
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return res;
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}
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}
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int main() {
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int n = 10;
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printf("foo(%d) = %d\n", n, foo(n));
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return 0;
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}
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