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291051e02d
ComputeElementAddress takes a base untagged address, an index, an index scale, and an offset and returns base + (index * scale) + offset as an untagged address. This removes the last conversions between untagged and unboxed integers for untagged GC-movable pointers. The only remaining conversions are the following cases, which all involve non-GC-movable pointers: 1. Calls to the FFI resolver (on IA32 only). 2. Returning nullptr when a pointer to memory is expected in exceptional returns from FFI callbacks. 3. Converting user-provided integers to FFI pointer objects and back. In addition, we no longer add the data field to materializations of typed data views, but instead recompute the data field in DeferredObject::Fill(). This removes the last source of unsafe untagged pointers that may have arbitrary lifetimes in the flow graph. Thus, we can now verify in the FlowGraphChecker that there are no GC-triggering instructions between the creation of an untagged GC-movable pointer and its use (including the use itself). To do this, this CL adds a predicate MayCreateUnsafeUntaggedPointer to definitions, which by default returns true for kUntagged results, false otherwise, and should only be overwritten in cases where the result can be proven to not be a untagged GC-movable pointer. TEST=vm/dart/regress_54710_il_test vm/cc/AllocationSinking_NoViewDataMaterialization Fixes: https://github.com/dart-lang/sdk/issues/54710 Cq-Include-Trybots: luci.dart.try:vm-aot-android-release-arm64c-try,vm-aot-linux-debug-x64-try,vm-aot-linux-debug-x64c-try,vm-aot-mac-release-arm64-try,vm-aot-mac-release-x64-try,vm-aot-obfuscate-linux-release-x64-try,vm-aot-optimization-level-linux-release-x64-try,vm-appjit-linux-debug-x64-try,vm-asan-linux-release-x64-try,vm-checked-mac-release-arm64-try,vm-eager-optimization-linux-release-ia32-try,vm-eager-optimization-linux-release-x64-try,vm-ffi-android-debug-arm-try,vm-ffi-android-debug-arm64c-try,vm-ffi-qemu-linux-release-arm-try,vm-ffi-qemu-linux-release-riscv64-try,vm-fuchsia-release-x64-try,vm-linux-debug-ia32-try,vm-linux-debug-x64c-try,vm-mac-debug-arm64-try,vm-mac-debug-x64-try,vm-msan-linux-release-x64-try,vm-reload-linux-debug-x64-try,vm-reload-rollback-linux-debug-x64-try,vm-ubsan-linux-release-x64-try,vm-win-release-ia32-try Change-Id: Ie172a8bd0330a728a4f151478664a530f8d9b38a Reviewed-on: https://dart-review.googlesource.com/c/sdk/+/354862 Commit-Queue: Tess Strickland <sstrickl@google.com> Reviewed-by: Alexander Markov <alexmarkov@google.com> |
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bin | ||
docs | ||
include | ||
lib | ||
observatory | ||
platform | ||
tests | ||
tools | ||
vm | ||
.clang-tidy | ||
.gitignore | ||
BUILD.gn | ||
codereview.settings | ||
configs.gni | ||
CPPLINT.cfg | ||
OWNERS | ||
PRESUBMIT.py | ||
runtime_args.gni | ||
vm-jit.shard.cml | ||
vm.shard.cml |