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[analyzer] Prevent AnalyzerStatsChecker from crash

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The checker marks the locations where the analyzer creates sinks. However, it
can happen that the sink was created because of a loop which does not contain
condition statement, only breaks in the body. The exhausted block is the block
which should contain the condition but empty, in this case.
This change only emits this marking in order to avoid the undefined behavior.

Differential Revision: https://reviews.llvm.org/D42266

llvm-svn: 325693
This commit is contained in:
Peter Szecsi 2018-02-21 16:06:56 +00:00
parent 36362692b3
commit 5184fae04e
2 changed files with 19 additions and 1 deletions
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2
clang/lib/StaticAnalyzer/Checkers/AnalyzerStatsChecker.cpp
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@ -122,6 +122,8 @@ void AnalyzerStatsChecker::checkEndAnalysis(ExplodedGraph &G,
E = CE.blocks_exhausted_end(); I != E; ++I) {
const BlockEdge &BE = I->first;
const CFGBlock *Exit = BE.getDst();
if (Exit->empty())
continue;
const CFGElement &CE = Exit->front();
if (Optional<CFGStmt> CS = CE.getAs<CFGStmt>()) {
SmallString<128> bufI;

18
clang/test/Analysis/analyzer-stats.c
View File

@ -1,4 +1,4 @@
// RUN: %clang_analyze_cc1 -analyzer-checker=core,deadcode.DeadStores,debug.Stats -verify -Wno-unreachable-code -analyzer-opt-analyze-nested-blocks %s
// RUN: %clang_analyze_cc1 -analyzer-checker=core,deadcode.DeadStores,debug.Stats -verify -Wno-unreachable-code -analyzer-opt-analyze-nested-blocks -analyzer-max-loop 4 %s
int foo();
@ -12,3 +12,19 @@ int test() { // expected-warning-re{{test -> Total CFGBlocks: {{[0-9]+}} | Unrea
a /= 4;
return a;
}
int sink() // expected-warning-re{{sink -> Total CFGBlocks: {{[0-9]+}} | Unreachable CFGBlocks: 1 | Exhausted Block: yes | Empty WorkList: yes}}
{
for (int i = 0; i < 10; ++i) // expected-warning {{(sink): The analyzer generated a sink at this point}}
++i;
return 0;
}
int emptyConditionLoop() // expected-warning-re{{emptyConditionLoop -> Total CFGBlocks: {{[0-9]+}} | Unreachable CFGBlocks: 0 | Exhausted Block: yes | Empty WorkList: yes}}
{
int num = 1;
for (;;)
num++;
}