[dfsan] Add full fast8 support
Complete support for fast8:
- amend shadow size and mapping in runtime
- remove fast16 mode and -dfsan-fast-16-labels flag
- remove legacy mode and make fast8 mode the default
- remove dfsan-fast-8-labels flag
- remove functions in dfsan interface only applicable to legacy
- remove legacy-related instrumentation code and tests
- update documentation.
Reviewed By: stephan.yichao.zhao, browneee
Differential Revision: https://reviews.llvm.org/D103745
GitOrigin-RevId: 5b4dda550ece353bd9dca703067a740e3dbf6ceb
diff --git a/dataflow/DataFlow.cpp b/dataflow/DataFlow.cpp
index 78b3f9a..3af48e2 100644
--- a/dataflow/DataFlow.cpp
+++ b/dataflow/DataFlow.cpp
@@ -17,11 +17,9 @@
// and also provides basic-block coverage for every input.
//
// Build:
-// 1. Compile this file (DataFlow.cpp) with -fsanitize=dataflow -mllvm
-// -dfsan-fast-16-labels and -O2.
+// 1. Compile this file (DataFlow.cpp) with -fsanitize=dataflow and -O2.
// 2. Compile DataFlowCallbacks.cpp with -O2 -fPIC.
// 3. Build the fuzz target with -g -fsanitize=dataflow
-// -mllvm -dfsan-fast-16-labels
// -fsanitize-coverage=trace-pc-guard,pc-table,bb,trace-cmp
// 4. Link those together with -fsanitize=dataflow
//
@@ -82,7 +80,7 @@
return __dft.PCsBeg[BlockIdx * 2 + 1] & PCFLAG_FUNC_ENTRY;
}
-const int kNumLabels = 16;
+const int kNumLabels = 8;
// Prints all instrumented functions.
static int PrintFunctions() {
