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Avoid skipping an initializer with a goto

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C++ doesn't allow skipping initialization with a goto. This means that
this code is illegal:

  void func(bool b) {
    if(b) goto END;
    int value = 0; //error C2362 with /permissive-
    //... value used here
  END:
    return;
  }

Adding an extra scope makes the code legal. This problem is only
detected with /permissive- but now that compiling with this
switch is practical we might as well stay /permissive- clean:
https://blogs.msdn.microsoft.com/vcblog/2016/11/16/permissive-switch/

Note that compiling /permissive- clean only works with the 10.0.16299.0
SDK which currently has other issues...

Bug: 773476
Change-Id: I54e64aaef46d70a817cf7da272f76d9ae5f6a6f7
Reviewed-on: https://chromium-review.googlesource.com/740287
Reviewed-by: Mark Mentovai <mark@chromium.org>
This commit is contained in:
Bruce Dawson 2017-10-26 14:17:45 -07:00 committed by Mark Mentovai
parent 2aaeead73f
commit 73d2773f9f
1 changed files with 9 additions and 6 deletions
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3
src/common/windows/pdb_source_line_writer.cc
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@ -1166,6 +1166,8 @@ int PDBSourceLineWriter::GetFunctionStackParamSize(IDiaSymbol *function) {
goto next_child;
}
// Extra scope to avoid goto jumping over variable initialization
{
int child_end = child_register_offset + static_cast<ULONG>(child_length);
if (child_register_offset < lowest_base) {
lowest_base = child_register_offset;
@ -1173,6 +1175,7 @@ int PDBSourceLineWriter::GetFunctionStackParamSize(IDiaSymbol *function) {
if (child_end > highest_end) {
highest_end = child_end;
}
}
next_child:
child.Release();