Don't emit bounds checks when the offset is less than the minimum memory size.

This commit is contained in:
Nick Lewycky
2019-10-28 15:53:26 -07:00
parent d46e5d499c
commit 9224db6d1e
3 changed files with 170 additions and 125 deletions

120
Cargo.lock generated
View File

@ -50,7 +50,7 @@ source = "registry+https://github.com/rust-lang/crates.io-index"
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"nix 0.15.0 (registry+https://github.com/rust-lang/crates.io-index)",
"smallvec 0.6.10 (registry+https://github.com/rust-lang/crates.io-index)",
"smallvec 0.6.11 (registry+https://github.com/rust-lang/crates.io-index)",
"wasmer-runtime-core 0.9.0",
]
@ -1573,7 +1573,7 @@ dependencies = [
"getrandom 0.1.13 (registry+https://github.com/rust-lang/crates.io-index)",
"libc 0.2.65 (registry+https://github.com/rust-lang/crates.io-index)",
"log 0.4.8 (registry+https://github.com/rust-lang/crates.io-index)",
"serde 1.0.101 (registry+https://github.com/rust-lang/crates.io-index)",
"serde 1.0.102 (registry+https://github.com/rust-lang/crates.io-index)",
"time 0.1.42 (registry+https://github.com/rust-lang/crates.io-index)",
"typetag 0.1.4 (registry+https://github.com/rust-lang/crates.io-index)",
"wasmer-runtime-core 0.9.0",
@ -1710,7 +1710,7 @@ source = "registry+https://github.com/rust-lang/crates.io-index"
"checksum inkwell_internal_macros 0.1.0 (git+https://github.com/wasmerio/inkwell?branch=llvm8-0)" = "<none>"
"checksum inventory 0.1.4 (registry+https://github.com/rust-lang/crates.io-index)" = "f4cece20baea71d9f3435e7bbe9adf4765f091c5fe404975f844006964a71299"
"checksum inventory-impl 0.1.4 (registry+https://github.com/rust-lang/crates.io-index)" = "c2869bf972e998977b1cb87e60df70341d48e48dca0823f534feb91ea44adaf9"
"checksum itertools 0.8.0 (registry+https://github.com/rust-lang/crates.io-index)" = "5b8467d9c1cebe26feb08c640139247fac215782d35371ade9a2136ed6085358"
"checksum itertools 0.8.1 (registry+https://github.com/rust-lang/crates.io-index)" = "87fa75c9dea7b07be3138c49abbb83fd4bea199b5cdc76f9804458edc5da0d6e"
"checksum itoa 0.4.4 (registry+https://github.com/rust-lang/crates.io-index)" = "501266b7edd0174f8530248f87f99c88fbe60ca4ef3dd486835b8d8d53136f7f"
"checksum kernel32-sys 0.2.2 (registry+https://github.com/rust-lang/crates.io-index)" = "7507624b29483431c0ba2d82aece8ca6cdba9382bff4ddd0f7490560c056098d"
"checksum lazy_static 1.4.0 (registry+https://github.com/rust-lang/crates.io-index)" = "e2abad23fbc42b3700f2f279844dc832adb2b2eb069b2df918f455c4e18cc646"
@ -1764,19 +1764,19 @@ source = "registry+https://github.com/rust-lang/crates.io-index"
"checksum scroll_derive 0.9.5 (registry+https://github.com/rust-lang/crates.io-index)" = "8f1aa96c45e7f5a91cb7fabe7b279f02fea7126239fc40b732316e8b6a2d0fcb"
"checksum semver 0.9.0 (registry+https://github.com/rust-lang/crates.io-index)" = "1d7eb9ef2c18661902cc47e535f9bc51b78acd254da71d375c2f6720d9a40403"
"checksum semver-parser 0.7.0 (registry+https://github.com/rust-lang/crates.io-index)" = "388a1df253eca08550bef6c72392cfe7c30914bf41df5269b68cbd6ff8f570a3"
"checksum serde 1.0.101 (registry+https://github.com/rust-lang/crates.io-index)" = "9796c9b7ba2ffe7a9ce53c2287dfc48080f4b2b362fcc245a259b3a7201119dd"
"checksum serde 1.0.102 (registry+https://github.com/rust-lang/crates.io-index)" = "0c4b39bd9b0b087684013a792c59e3e07a46a01d2322518d8a1104641a0b1be0"
"checksum serde-bench 0.0.7 (registry+https://github.com/rust-lang/crates.io-index)" = "d733da87e79faaac25616e33d26299a41143fd4cd42746cbb0e91d8feea243fd"
"checksum serde_bytes 0.11.2 (registry+https://github.com/rust-lang/crates.io-index)" = "45af0182ff64abaeea290235eb67da3825a576c5d53e642c4d5b652e12e6effc"
"checksum serde_derive 1.0.101 (registry+https://github.com/rust-lang/crates.io-index)" = "4b133a43a1ecd55d4086bd5b4dc6c1751c68b1bfbeba7a5040442022c7e7c02e"
"checksum serde_derive 1.0.102 (registry+https://github.com/rust-lang/crates.io-index)" = "ca13fc1a832f793322228923fbb3aba9f3f44444898f835d31ad1b74fa0a2bf8"
"checksum serde_json 1.0.41 (registry+https://github.com/rust-lang/crates.io-index)" = "2f72eb2a68a7dc3f9a691bfda9305a1c017a6215e5a4545c258500d2099a37c2"
"checksum smallvec 0.6.10 (registry+https://github.com/rust-lang/crates.io-index)" = "ab606a9c5e214920bb66c458cd7be8ef094f813f20fe77a54cc7dbfff220d4b7"
"checksum smallvec 0.6.11 (registry+https://github.com/rust-lang/crates.io-index)" = "cefaa50e76a6f10b86f36e640eb1739eafbd4084865067778463913e43a77ff3"
"checksum stable_deref_trait 1.1.1 (registry+https://github.com/rust-lang/crates.io-index)" = "dba1a27d3efae4351c8051072d619e3ade2820635c3958d826bfea39d59b54c8"
"checksum strsim 0.8.0 (registry+https://github.com/rust-lang/crates.io-index)" = "8ea5119cdb4c55b55d432abb513a0429384878c15dde60cc77b1c99de1a95a6a"
"checksum structopt 0.3.3 (registry+https://github.com/rust-lang/crates.io-index)" = "6d4f66a4c0ddf7aee4677995697366de0749b0139057342eccbb609b12d0affc"
"checksum structopt-derive 0.3.3 (registry+https://github.com/rust-lang/crates.io-index)" = "8fe0c13e476b4e21ff7f5c4ace3818b6d7bdc16897c31c73862471bc1663acae"
"checksum syn 0.11.11 (registry+https://github.com/rust-lang/crates.io-index)" = "d3b891b9015c88c576343b9b3e41c2c11a51c219ef067b264bd9c8aa9b441dad"
"checksum syn 0.15.44 (registry+https://github.com/rust-lang/crates.io-index)" = "9ca4b3b69a77cbe1ffc9e198781b7acb0c7365a883670e8f1c1bc66fba79a5c5"
"checksum syn 1.0.5 (registry+https://github.com/rust-lang/crates.io-index)" = "66850e97125af79138385e9b88339cbcd037e3f28ceab8c5ad98e64f0f1f80bf"
"checksum syn 1.0.7 (registry+https://github.com/rust-lang/crates.io-index)" = "0e7bedb3320d0f3035594b0b723c8a28d7d336a3eda3881db79e61d676fb644c"
"checksum synom 0.11.3 (registry+https://github.com/rust-lang/crates.io-index)" = "a393066ed9010ebaed60b9eafa373d4b1baac186dd7e008555b0f702b51945b6"
"checksum synstructure 0.12.1 (registry+https://github.com/rust-lang/crates.io-index)" = "3f085a5855930c0441ca1288cf044ea4aecf4f43a91668abdb870b4ba546a203"
"checksum take_mut 0.2.2 (registry+https://github.com/rust-lang/crates.io-index)" = "f764005d11ee5f36500a149ace24e00e3da98b0158b3e2d53a7495660d3f4d60"
@ -1787,7 +1787,7 @@ source = "registry+https://github.com/rust-lang/crates.io-index"
"checksum time 0.1.42 (registry+https://github.com/rust-lang/crates.io-index)" = "db8dcfca086c1143c9270ac42a2bbd8a7ee477b78ac8e45b19abfb0cbede4b6f"
"checksum tinytemplate 1.0.2 (registry+https://github.com/rust-lang/crates.io-index)" = "4574b75faccaacddb9b284faecdf0b544b80b6b294f3d062d325c5726a209c20"
"checksum toml 0.4.10 (registry+https://github.com/rust-lang/crates.io-index)" = "758664fc71a3a69038656bee8b6be6477d2a6c315a6b81f7081f591bffa4111f"
"checksum toml 0.5.3 (registry+https://github.com/rust-lang/crates.io-index)" = "c7aabe75941d914b72bf3e5d3932ed92ce0664d49d8432305a8b547c37227724"
"checksum toml 0.5.4 (registry+https://github.com/rust-lang/crates.io-index)" = "c04dffffeac90885436d23c692517bb5b8b3f8863e4afc15023628d067d667b7"
"checksum typenum 1.11.2 (registry+https://github.com/rust-lang/crates.io-index)" = "6d2783fe2d6b8c1101136184eb41be8b1ad379e4657050b8aaff0c79ee7575f9"
"checksum typetag 0.1.4 (registry+https://github.com/rust-lang/crates.io-index)" = "6ebb2c484029d695fb68a06d80e1536c68d491b3e0cf874c66abed255e831cfe"
"checksum typetag-impl 0.1.4 (registry+https://github.com/rust-lang/crates.io-index)" = "b63fd4799e4d0ec5cf0b055ebb8e2c3a657bbf76a84f6edc77ca60780e000204"

View File

@ -561,18 +561,25 @@ fn resolve_memory_ptr(
) -> Result<PointerValue, BinaryReaderError> {
// Look up the memory base (as pointer) and bounds (as unsigned integer).
let memory_cache = ctx.memory(MemoryIndex::new(0), intrinsics);
let (mem_base, mem_bound) = match memory_cache {
let (mem_base, mem_bound, minimum, _maximum) = match memory_cache {
MemoryCache::Dynamic {
ptr_to_base_ptr,
ptr_to_bounds,
minimum,
maximum,
} => {
let base = builder
.build_load(ptr_to_base_ptr, "base")
.into_pointer_value();
let bounds = builder.build_load(ptr_to_bounds, "bounds").into_int_value();
(base, bounds)
(base, bounds, minimum, maximum)
}
MemoryCache::Static { base_ptr, bounds } => (base_ptr, bounds),
MemoryCache::Static {
base_ptr,
bounds,
minimum,
maximum,
} => (base_ptr, bounds, minimum, maximum),
};
let mem_base = builder
.build_bitcast(mem_base, intrinsics.i8_ptr_ty, &state.var_name())
@ -587,18 +594,41 @@ fn resolve_memory_ptr(
if let MemoryCache::Dynamic { .. } = memory_cache {
// If the memory is dynamic, do a bounds check. For static we rely on
// the size being a multiple of the page size and hitting a reserved
// but unreadable memory.
// the size being a multiple of the page size and hitting a guard page.
let value_size_v = intrinsics.i64_ty.const_int(value_size as u64, false);
let ptr_in_bounds = if effective_offset.is_const() {
let load_offset_end = effective_offset.const_add(value_size_v);
let ptr_in_bounds = load_offset_end.const_int_compare(
IntPredicate::ULE,
intrinsics.i64_ty.const_int(minimum.bytes().0 as u64, false),
);
if ptr_in_bounds.is_constant_int() {
Some(ptr_in_bounds)
} else {
None
}
} else {
None
}
.unwrap_or_else(|| {
let load_offset_end =
builder.build_int_add(effective_offset, value_size_v, &state.var_name());
let ptr_in_bounds = builder.build_int_compare(
builder.build_int_compare(
IntPredicate::ULE,
load_offset_end,
mem_bound,
&state.var_name(),
);
)
});
if !ptr_in_bounds.is_constant_int()
|| ptr_in_bounds.get_zero_extended_constant().unwrap() != 1
{
// LLVM may have folded this into 'i1 true' in which case we know
// the pointer is in bounds. LLVM may also have folded it into a
// constant expression, not known to be either true or false yet.
// If it's false, unknown-but-constant, or not-a-constant, emit a
// runtime bounds check. LLVM may yet succeed at optimizing it away.
let ptr_in_bounds = builder
.build_call(
intrinsics.expect_i1,
@ -630,6 +660,7 @@ fn resolve_memory_ptr(
builder.build_unreachable();
builder.position_at_end(&in_bounds_continue_block);
}
}
let ptr = unsafe { builder.build_gep(mem_base, &[effective_offset], &state.var_name()) };
Ok(builder

View File

@ -21,6 +21,7 @@ use wasmer_runtime_core::{
GlobalIndex, ImportedFuncIndex, LocalFuncIndex, LocalOrImport, MemoryIndex, SigIndex,
TableIndex, Type,
},
units::Pages,
vm::{Ctx, INTERNALS_SIZE},
};
@ -559,11 +560,15 @@ pub enum MemoryCache {
Dynamic {
ptr_to_base_ptr: PointerValue,
ptr_to_bounds: PointerValue,
minimum: Pages,
maximum: Option<Pages>,
},
/// The memory is always in the same place.
Static {
base_ptr: PointerValue,
bounds: IntValue,
minimum: Pages,
maximum: Option<Pages>,
},
}
@ -662,7 +667,8 @@ impl<'a> CtxType<'a> {
);
*cached_memories.entry(index).or_insert_with(|| {
let (memory_array_ptr_ptr, index, memory_type) = match index.local_or_import(info) {
let (memory_array_ptr_ptr, index, memory_type, minimum, maximum) =
match index.local_or_import(info) {
LocalOrImport::Local(local_mem_index) => (
unsafe {
cache_builder.build_struct_gep(
@ -673,6 +679,8 @@ impl<'a> CtxType<'a> {
},
local_mem_index.index() as u64,
info.memories[local_mem_index].memory_type(),
info.memories[local_mem_index].minimum,
info.memories[local_mem_index].maximum,
),
LocalOrImport::Import(import_mem_index) => (
unsafe {
@ -684,6 +692,8 @@ impl<'a> CtxType<'a> {
},
import_mem_index.index() as u64,
info.imported_memories[import_mem_index].1.memory_type(),
info.imported_memories[import_mem_index].1.minimum,
info.imported_memories[import_mem_index].1.maximum,
),
};
@ -713,6 +723,8 @@ impl<'a> CtxType<'a> {
MemoryType::Dynamic => MemoryCache::Dynamic {
ptr_to_base_ptr,
ptr_to_bounds,
minimum,
maximum,
},
MemoryType::Static | MemoryType::SharedStatic => MemoryCache::Static {
base_ptr: cache_builder
@ -721,6 +733,8 @@ impl<'a> CtxType<'a> {
bounds: cache_builder
.build_load(ptr_to_bounds, "bounds")
.into_int_value(),
minimum,
maximum,
},
}
})