feat(r8-tests): Add R8 exception handling tests

tests/r8-exception-handling.rs

@@ -0,0 +1,98 @@
+//! Tests for R8 retrace "Exception Handling" fixtures.
+//!
+//! Ported from the upstream R8 retrace fixtures in:
+//! `src/test/java/com/android/tools/r8/retrace/stacktraces/`.
+//!
+//! Notes:
+//! - Fixture mapping indentation is normalized to 4-space member indentation so it is parsed by this
+//!   crate's Proguard mapping parser.
+//! - Expected stacktrace indentation is normalized to this crate's output (`"    at ..."`).
+//! - These tests intentionally do **not** assert on R8 warning counts; this crate currently does not
+//!   surface equivalent diagnostics.
+#![allow(clippy::unwrap_used)]
+
+use proguard::{ProguardCache, ProguardMapper, ProguardMapping};
+
+fn assert_remap_stacktrace(mapping: &str, input: &str, expected: &str) {
+    let mapper = ProguardMapper::from(mapping);
+    let actual = mapper.remap_stacktrace(input).unwrap();
+    assert_eq!(actual.trim_end(), expected.trim_end());
+
+    let mapping = ProguardMapping::new(mapping.as_bytes());
+    let mut buf = Vec::new();
+    ProguardCache::write(&mapping, &mut buf).unwrap();
+    let cache = ProguardCache::parse(&buf).unwrap();
+    cache.test();
+
+    let actual = cache.remap_stacktrace(input).unwrap();
+    assert_eq!(actual.trim_end(), expected.trim_end());
+}
+
+// =============================================================================
+// ObfucatedExceptionClassStackTrace
+// =============================================================================
+
+const OBFUSCATED_EXCEPTION_CLASS_MAPPING: &str = r#"foo.bar.baz -> a.b.c:
+"#;
+
+#[test]
+fn test_obfuscated_exception_class_stacktrace() {
+    let input = r#"a.b.c: Problem when compiling program
+    at r8.main(App:800)
+Caused by: a.b.c: You have to write the program first
+    at r8.retrace(App:184)
+    ... 7 more
+"#;
+
+    let expected = r#"foo.bar.baz: Problem when compiling program
+    at r8.main(App:800)
+Caused by: foo.bar.baz: You have to write the program first
+    at r8.retrace(App:184)
+    ... 7 more
+"#;
+
+    assert_remap_stacktrace(OBFUSCATED_EXCEPTION_CLASS_MAPPING, input, expected);
+}
+
+// =============================================================================
+// RetraceAssertionErrorStackTrace
+// =============================================================================
+
+const RETRACE_ASSERTION_ERROR_STACKTRACE_MAPPING: &str = r#"com.android.tools.r8.retrace.Retrace -> com.android.tools.r8.retrace.Retrace:
+    boolean $assertionsDisabled -> a
+    1:5:void <clinit>():34:38 -> <clinit>
+    1:1:void <init>():35:35 -> <init>
+com.android.tools.r8.retrace.RetraceCore$StackTraceNode -> com.android.tools.r8.retrace.h:
+    java.util.List lines -> a
+    boolean $assertionsDisabled -> b
+    1:1:void <clinit>():24:24 -> <clinit>
+    1:4:void <init>(java.util.List):28:31 -> <init>
+com.android.tools.r8.retrace.RetraceCore -> com.android.tools.r8.retrace.f:
+    1:3:com.android.tools.r8.retrace.RetraceCore$RetraceResult retrace():106:108 -> a
+    4:7:void retraceLine(java.util.List,int,java.util.List):112:115 -> a
+    8:8:void retraceLine(java.util.List,int,java.util.List):115 -> a
+    47:50:void retraceLine(java.util.List,int,java.util.List):116:119 -> a
+com.android.tools.r8.retrace.Retrace -> com.android.tools.r8.retrace.Retrace:
+    1:9:void run(com.android.tools.r8.retrace.RetraceCommand):112:120 -> run
+"#;
+
+#[test]
+fn test_retrace_assertion_error_stacktrace() {
+    let input = r#"java.lang.AssertionError
+    at com.android.tools.r8.retrace.h.<init>(:4)
+    at com.android.tools.r8.retrace.f.a(:48)
+    at com.android.tools.r8.retrace.f.a(:2)
+    at com.android.tools.r8.retrace.Retrace.run(:5)
+    at com.android.tools.r8.retrace.RetraceTests.testNullLineTrace(RetraceTests.java:73)
+"#;
+
+    let expected = r#"java.lang.AssertionError
+    at com.android.tools.r8.retrace.RetraceCore$StackTraceNode.<init>(RetraceCore.java:31)
+    at com.android.tools.r8.retrace.RetraceCore.retraceLine(RetraceCore.java:117)
+    at com.android.tools.r8.retrace.RetraceCore.retrace(RetraceCore.java:107)
+    at com.android.tools.r8.retrace.Retrace.run(Retrace.java:116)
+    at com.android.tools.r8.retrace.RetraceTests.testNullLineTrace(RetraceTests.java:73)
+"#;
+
+    assert_remap_stacktrace(RETRACE_ASSERTION_ERROR_STACKTRACE_MAPPING, input, expected);
+}