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LLVM: disable inline 8-bit counters when using trace pc guard

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This commit is contained in:
Andrew Kelley 2024-08-28 14:52:57 -07:00
parent 88bba4c154
commit 1bec824cad
2 changed files with 12 additions and 5 deletions
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16
lib/std/Build/Step/Compile.zig
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@ -218,12 +218,18 @@ no_builtin: bool = false,
/// Managed by the build runner, not user build script.
zig_process: ?*Step.ZigProcess,
/// Enables deprecated coverage instrumentation that is only useful if you
/// are using third party fuzzers that depend on it. Otherwise, slows down
/// the instrumented binary with unnecessary function calls.
/// Enables coverage instrumentation that is only useful if you are using third
/// party fuzzers that depend on it. Otherwise, slows down the instrumented
/// binary with unnecessary function calls.
///
/// To enable fuzz testing instrumentation on a compilation, see the `fuzz`
/// flag in `Module`.
/// This kind of coverage instrumentation is used by AFLplusplus v4.21c,
/// however, modern fuzzers - including Zig - have switched to using "inline
/// 8-bit counters" or "inline bool flag" which incurs only a single
/// instruction for coverage, along with "trace cmp" which instruments
/// comparisons and reports the operands.
///
/// To instead enable fuzz testing instrumentation on a compilation using Zig's
/// builtin fuzzer, see the `fuzz` flag in `Module`.
sanitize_coverage_trace_pc_guard: ?bool = null,
pub const ExpectedCompileErrors = union(enum) {

1
src/codegen/llvm.zig
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@ -1664,6 +1664,7 @@ pub const Object = struct {
if (!owner_mod.fuzz) break :f null;
if (func_analysis.disable_instrumentation) break :f null;
if (is_naked) break :f null;
if (comp.config.san_cov_trace_pc_guard) break :f null;
// The void type used here is a placeholder to be replaced with an
// array of the appropriate size after the POI count is known.