[gcc r15-8545] gccrs: fix crash in hir dump with missing guards

[Arthur Cohen via Gcc-cvs]

https://gcc.gnu.org/g:42be99fc1ec19c84c03770bef776a7b615839f9a

commit r15-8545-g42be99fc1ec19c84c03770bef776a7b615839f9a
Author: Philip Herron <herron.phi...@googlemail.com>
Date:   Mon Nov 25 20:16:42 2024 +0000

    gccrs: fix crash in hir dump with missing guards
    
    gcc/rust/ChangeLog:
    
            * hir/rust-hir-dump.cc (Dump::visit): add missing null checks
    
    Signed-off-by: Philip Herron <herron.phi...@googlemail.com>

Diff:
---
 gcc/rust/hir/rust-hir-dump.cc | 12 ++++++++----
 1 file changed, 8 insertions(+), 4 deletions(-)

diff --git a/gcc/rust/hir/rust-hir-dump.cc b/gcc/rust/hir/rust-hir-dump.cc
index 1b48b294008c..be785b9ebec2 100644
--- a/gcc/rust/hir/rust-hir-dump.cc
+++ b/gcc/rust/hir/rust-hir-dump.cc
@@ -1892,7 +1892,8 @@ Dump::visit (TraitItemFunc &e)
 
   do_traitfunctiondecl (e.get_decl ());
 
-  visit_field ("block_expr", e.get_block_expr ());
+  if (e.has_definition ())
+    visit_field ("block_expr", e.get_block_expr ());
 
   end ("TraitItemFunc");
 }
@@ -2007,7 +2008,8 @@ Dump::visit (ExternalFunctionItem &e)
 
   put_field ("has_variadics", std::to_string (e.is_variadic ()));
 
-  visit_field ("return_type", e.get_return_type ());
+  if (e.has_return_type ())
+    visit_field ("return_type", e.get_return_type ());
 
   end ("ExternalFunctionItem");
 }
@@ -2254,8 +2256,10 @@ Dump::visit (LetStmt &e)
 
   put_field ("variable_pattern", e.get_pattern ().as_string ());
 
-  visit_field ("type", e.get_type ());
-  visit_field ("init_expr", e.get_init_expr ());
+  if (e.has_type ())
+    visit_field ("type", e.get_type ());
+  if (e.has_init_expr ())
+    visit_field ("init_expr", e.get_init_expr ());
 
   end ("LetStmt");
 }