[PATCH] D102782: Add support for Warning Flag "-Wstack-usage="

[Ryan Santhirarajan via Phabricator via cfe-commits]

rsanthir.quic created this revision.
Herald added subscribers: dexonsmith, dang.
rsanthir.quic requested review of this revision.
Herald added a project: clang.
Herald added a subscriber: cfe-commits.

With this implementation "-Wstack-usage" acts as an alias to
"-Wframe-larger-than"


Repository:
  rG LLVM Github Monorepo

https://reviews.llvm.org/D102782

Files:
  clang/include/clang/Driver/Options.td
  clang/lib/Basic/Warnings.cpp
  clang/test/Frontend/backend-stack-usage-diagnostic.c


Index: clang/test/Frontend/backend-stack-usage-diagnostic.c
===================================================================
--- /dev/null
+++ clang/test/Frontend/backend-stack-usage-diagnostic.c
@@ -0,0 +1,17 @@
+// RUN: %clang -Wstack-usage=0 -o /dev/null -c %s 2> %t.err
+// RUN: FileCheck < %t.err %s --check-prefix=WARN
+// RUN: %clang -Wno-stack-usage= -w -o /dev/null -c %s 2> %t.err
+// RUN: FileCheck < %t.err %s --check-prefix=IGNORE --allow-empty
+// RUN: %clang -Wstack-usage=0 -w -o /dev/null -c %s 2> %t.err
+// RUN: FileCheck < %t.err %s --check-prefix=IGNORE --allow-empty
+// RUN: %clang -Wstack-usage=3 -o /dev/null -c %s 2> %t.err
+// RUN: FileCheck < %t.err %s --check-prefix=WARN
+// RUN: %clang -Wstack-usage=100 -o /dev/null -c %s 2> %t.err
+// RUN: FileCheck < %t.err %s --check-prefix=IGNORE --allow-empty
+
+// WARN: warning: stack frame size of {{[0-9]+}} bytes in function 'test_square'
+// IGNORE-NOT:  stack frame size of {{[0-9]+}} bytes in function 'test_square'
+int test_square(int num) {
+  return num * num;
+}
+
Index: clang/lib/Basic/Warnings.cpp
===================================================================
--- clang/lib/Basic/Warnings.cpp
+++ clang/lib/Basic/Warnings.cpp
@@ -94,6 +94,11 @@
       if (Opt == "format=0")
         Opt = "no-format";
 
+      // -Wstack-usage is aliased to -Wframe-larger-than, this handles
+      // the negative case, as table gen does not.
+      if (Opt == "no-stack-usage=")
+        Opt = "no-frame-larger-than=";
+
       // Check to see if this warning starts with "no-", if so, this is a
       // negative form of the option.
       bool isPositive = true;
Index: clang/include/clang/Driver/Options.td
===================================================================
--- clang/include/clang/Driver/Options.td
+++ clang/include/clang/Driver/Options.td
@@ -2500,6 +2500,8 @@
 def Wlarger_than_EQ : Joined<["-"], "Wlarger-than=">, Group<clang_ignored_f_Group>;
 def Wlarger_than_ : Joined<["-"], "Wlarger-than-">, Alias<Wlarger_than_EQ>;
 def Wframe_larger_than_EQ : Joined<["-"], "Wframe-larger-than=">, Group<f_Group>, Flags<[NoXarchOption]>;
+def Wstack_stack_usage_EQ : Joined<["-"], "Wstack-usage=">, Flags<[NoXarchOption]>,
+  Alias<Wframe_larger_than_EQ>;
 
 def : Flag<["-"], "fterminated-vtables">, Alias<fapple_kext>;
 defm threadsafe_statics : BoolFOption<"threadsafe-statics",


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