Author: ahatanak
Date: Wed Jul 11 15:19:14 2018
New Revision: 336863
URL: http://llvm.org/viewvc/llvm-project?rev=336863&view=rev
Log:
os_log: When there are multiple privacy annotations in the format
string, choose the strictest one instead of the last.
Also fix an undefined behavior. Move the pointer update to a later point to
avoid adding StringRef::npos to the pointer.
rdar://problem/40706280
Modified:
cfe/trunk/lib/Analysis/PrintfFormatString.cpp
cfe/trunk/test/CodeGen/builtins.c
Modified: cfe/trunk/lib/Analysis/PrintfFormatString.cpp
URL:
http://llvm.org/viewvc/llvm-project/cfe/trunk/lib/Analysis/PrintfFormatString.cpp?rev=336863&r1=336862&r2=336863&view=diff
==============================================================================
--- cfe/trunk/lib/Analysis/PrintfFormatString.cpp (original)
+++ cfe/trunk/lib/Analysis/PrintfFormatString.cpp Wed Jul 11 15:19:14 2018
@@ -135,17 +135,16 @@ static PrintfSpecifierResult ParsePrintf
MatchedStr = Matches[1];
I += Matches[0].size();
- // Set the privacy flag if there is a privacy annotation in the
- // comma-delimited segment. This overrides any privacy annotations that
- // appeared in previous comma-delimited segments.
+ // Set the privacy flag if the privacy annotation in the
+ // comma-delimited segment is at least as strict as the privacy
+ // annotations in previous comma-delimited segments.
if (MatchedStr.equals("private"))
PrivacyFlags = clang::analyze_os_log::OSLogBufferItem::IsPrivate;
- else if (MatchedStr.equals("public"))
+ else if (PrivacyFlags == 0 && MatchedStr.equals("public"))
PrivacyFlags = clang::analyze_os_log::OSLogBufferItem::IsPublic;
} else {
size_t CommaOrBracePos =
Str.find_if([](char c) { return c == ',' || c == '}'; });
- I += CommaOrBracePos + 1;
if (CommaOrBracePos == StringRef::npos) {
// Neither a comma nor the closing brace was found.
@@ -153,6 +152,8 @@ static PrintfSpecifierResult ParsePrintf
H.HandleIncompleteSpecifier(Start, E - Start);
return true;
}
+
+ I += CommaOrBracePos + 1;
}
// Continue until the closing brace is found.
} while (*(I - 1) == ',');
Modified: cfe/trunk/test/CodeGen/builtins.c
URL:
http://llvm.org/viewvc/llvm-project/cfe/trunk/test/CodeGen/builtins.c?rev=336863&r1=336862&r2=336863&view=diff
==============================================================================
--- cfe/trunk/test/CodeGen/builtins.c (original)
+++ cfe/trunk/test/CodeGen/builtins.c Wed Jul 11 15:19:14 2018
@@ -421,7 +421,7 @@ void test_builtin_os_log(void *buf, int
// CHECK: %[[V5:.*]] = load i8*, i8** %[[DATA_ADDR]]
// CHECK: %[[V6:.*]] = ptrtoint i8* %[[V5]] to i64
// CHECK: call void @__os_log_helper_1_3_4_4_0_8_34_4_17_8_49(i8* %[[V1]],
i32 %[[V2]], i64 %[[V4]], i32 16, i64 %[[V6]])
- __builtin_os_log_format(buf, "%d %{private,public}s %{public,private}.16P",
i, data, data);
+ __builtin_os_log_format(buf, "%d %{public}s %{private}.16P", i, data, data);
// privacy annotations aren't recognized when they are preceded or followed
// by non-whitespace characters.
@@ -443,7 +443,7 @@ void test_builtin_os_log(void *buf, int
// The last privacy annotation in the string wins.
// CHECK: call void @__os_log_helper_1_3_1_8_33(
- __builtin_os_log_format(buf, "%{ public, private, public, private}s", "abc");
+ __builtin_os_log_format(buf, "%{ private, public, private, public}s", "abc");
}
// CHECK-LABEL: define linkonce_odr hidden void
@__os_log_helper_1_3_4_4_0_8_34_4_17_8_49
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