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Implement categories for special case lists.

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A special case list can now specify categories for specific globals,
which can be used to instruct an instrumentation pass to treat certain
functions or global variables in a specific way, such as by omitting
certain aspects of instrumentation while keeping others, or informing
the instrumentation pass that a specific uninstrumentable function
has certain semantics, thus allowing the pass to instrument callers
according to those semantics.

For example, AddressSanitizer now uses the "init" category instead of
global-init prefixes for globals whose initializers should not be
instrumented, but which in all other respects should be instrumented.

The motivating use case is DataFlowSanitizer, which will have a
number of different categories for uninstrumentable functions, such
as "functional" which specifies that a function has pure functional
semantics, or "discard" which indicates that a function's return
value should not be labelled.

Differential Revision: http://llvm-reviews.chandlerc.com/D1092

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@185978 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Peter Collingbourne
2013-07-09 22:03:17 +00:00
parent c7087f8e42
commit 46e11c4c97
4 changed files with 182 additions and 53 deletions
Download Patch File Download Diff File Expand all files Collapse all files

41
unittests/Transforms/Utils/SpecialCaseList.cpp
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@@ -82,6 +82,13 @@ TEST_F(SpecialCaseListTest, FunctionIsIn) {
"fun:bar\n"));
EXPECT_TRUE(SCL->isIn(*Foo));
EXPECT_TRUE(SCL->isIn(*Bar));
SCL.reset(makeSpecialCaseList("fun:foo=functional\n"));
EXPECT_TRUE(SCL->isIn(*Foo, "functional"));
StringRef Category;
EXPECT_TRUE(SCL->findCategory(*Foo, Category));
EXPECT_EQ("functional", Category);
EXPECT_FALSE(SCL->isIn(*Bar, "functional"));
}
TEST_F(SpecialCaseListTest, GlobalIsIn) {
@@ -92,26 +99,44 @@ TEST_F(SpecialCaseListTest, GlobalIsIn) {
OwningPtr<SpecialCaseList> SCL(makeSpecialCaseList("global:foo\n"));
EXPECT_TRUE(SCL->isIn(*Foo));
EXPECT_FALSE(SCL->isIn(*Bar));
EXPECT_FALSE(SCL->isInInit(*Foo));
EXPECT_FALSE(SCL->isInInit(*Bar));
EXPECT_FALSE(SCL->isIn(*Foo, "init"));
EXPECT_FALSE(SCL->isIn(*Bar, "init"));
SCL.reset(makeSpecialCaseList("global:foo=init\n"));
EXPECT_FALSE(SCL->isIn(*Foo));
EXPECT_FALSE(SCL->isIn(*Bar));
EXPECT_TRUE(SCL->isIn(*Foo, "init"));
EXPECT_FALSE(SCL->isIn(*Bar, "init"));
SCL.reset(makeSpecialCaseList("global-init:foo\n"));
EXPECT_FALSE(SCL->isIn(*Foo));
EXPECT_FALSE(SCL->isIn(*Bar));
EXPECT_TRUE(SCL->isInInit(*Foo));
EXPECT_FALSE(SCL->isInInit(*Bar));
EXPECT_TRUE(SCL->isIn(*Foo, "init"));
EXPECT_FALSE(SCL->isIn(*Bar, "init"));
SCL.reset(makeSpecialCaseList("type:t2=init\n"));
EXPECT_FALSE(SCL->isIn(*Foo));
EXPECT_FALSE(SCL->isIn(*Bar));
EXPECT_FALSE(SCL->isIn(*Foo, "init"));
EXPECT_TRUE(SCL->isIn(*Bar, "init"));
SCL.reset(makeSpecialCaseList("global-init-type:t2\n"));
EXPECT_FALSE(SCL->isIn(*Foo));
EXPECT_FALSE(SCL->isIn(*Bar));
EXPECT_FALSE(SCL->isInInit(*Foo));
EXPECT_TRUE(SCL->isInInit(*Bar));
EXPECT_FALSE(SCL->isIn(*Foo, "init"));
EXPECT_TRUE(SCL->isIn(*Bar, "init"));
SCL.reset(makeSpecialCaseList("src:hello=init\n"));
EXPECT_FALSE(SCL->isIn(*Foo));
EXPECT_FALSE(SCL->isIn(*Bar));
EXPECT_TRUE(SCL->isIn(*Foo, "init"));
EXPECT_TRUE(SCL->isIn(*Bar, "init"));
SCL.reset(makeSpecialCaseList("global-init-src:hello\n"));
EXPECT_FALSE(SCL->isIn(*Foo));
EXPECT_FALSE(SCL->isIn(*Bar));
EXPECT_TRUE(SCL->isInInit(*Foo));
EXPECT_TRUE(SCL->isInInit(*Bar));
EXPECT_TRUE(SCL->isIn(*Foo, "init"));
EXPECT_TRUE(SCL->isIn(*Bar, "init"));
}
}