Mimic Ruby's backtrace logic in ruby interpreter and tracer, add support for ruby CMEs

interpreter/ruby/flags.go

@@ -0,0 +1,35 @@
+// Copyright The OpenTelemetry Authors
+// SPDX-License-Identifier: Apache-2.0
+
+package ruby // import "go.opentelemetry.io/ebpf-profiler/interpreter/ruby"
+
+// Various used ruby ushift constants
+// calculates them here based on RUBY_FL_USHIFT, copying their logic
+const (
+	// https://github.com/ruby/ruby/blob/1d1529629ce1550fad19c2d9410c4bf4995230d2/include/ruby/internal/fl_type.h#L158
+	RUBY_FL_USHIFT = 12
+
+	RUBY_FL_USER0 = 1 << (RUBY_FL_USHIFT + 0)
+	// https://github.com/ruby/ruby/blob/1d1529629ce1550fad19c2d9410c4bf4995230d2/include/ruby/internal/fl_type.h#L323-L324
+	RUBY_FL_USER1 = 1 << (RUBY_FL_USHIFT + 1)
+
+	// Used for computing embed array flag
+	RUBY_FL_USER3 = 1 << (RUBY_FL_USHIFT + 3)
+	RUBY_FL_USER4 = 1 << (RUBY_FL_USHIFT + 4)
+	RUBY_FL_USER5 = 1 << (RUBY_FL_USHIFT + 5)
+	RUBY_FL_USER6 = 1 << (RUBY_FL_USHIFT + 6)
+	RUBY_FL_USER7 = 1 << (RUBY_FL_USHIFT + 7)
+	RUBY_FL_USER8 = 1 << (RUBY_FL_USHIFT + 8)
+	RUBY_FL_USER9 = 1 << (RUBY_FL_USHIFT + 9)
+
+	// https://github.com/ruby/ruby/blob/8836f26efa7a6deb0ef8b3f253d8d53d04d43152/include/ruby/internal/core/rarray.h#L102
+	RARRAY_EMBED_FLAG = RUBY_FL_USER1
+
+	// https://github.com/ruby/ruby/blob/8836f26efa7a6deb0ef8b3f253d8d53d04d43152/include/ruby/internal/core/rarray.h#L114-L115
+	RARRAY_EMBED_LEN_MASK = RUBY_FL_USER9 | RUBY_FL_USER8 | RUBY_FL_USER7 | RUBY_FL_USER6 |
+		RUBY_FL_USER5 | RUBY_FL_USER4 | RUBY_FL_USER3
+
+	// RARRAY_EMBED_LEN_SHIFT
+	// https://github.com/ruby/ruby/blob/8836f26efa7a6deb0ef8b3f253d8d53d04d43152/include/ruby/internal/core/rarray.h#L122-L125
+	RARRAY_EMBED_LEN_SHIFT = RUBY_FL_USHIFT + 3
+)