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[wasm] Use more GraphAssembler

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This rewrites some more code to use GraphAssembler methods instead of
manually creating and adding the nodes. To this end, we add three more
methods to the GraphAssembler: UintPtrConstant, ProtectedStore, and
ProtectedLoad.

R=ahaas@chromium.org, tebbi@chromium.org

Bug: v8:10123
Change-Id: I825137d4355d117d88e29063ab2ac68340883f77
Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/2445512
Commit-Queue: Clemens Backes <clemensb@chromium.org>
Reviewed-by: Tobias Tebbi <tebbi@chromium.org>
Reviewed-by: Andreas Haas <ahaas@chromium.org>
Cr-Commit-Position: refs/heads/master@{#70338}
This commit is contained in:
Clemens Backes 2020-10-02 16:26:59 +02:00 committed by Commit Bot
parent 930654e5f2
commit 24b3c1610f
3 changed files with 45 additions and 53 deletions
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16
src/compiler/graph-assembler.cc
View File

@ -351,6 +351,10 @@ Node* GraphAssembler::IntPtrConstant(intptr_t value) {
return AddClonedNode(mcgraph()->IntPtrConstant(value));
}
Node* GraphAssembler::UintPtrConstant(uintptr_t value) {
return AddClonedNode(mcgraph()->UintPtrConstant(value));
}
Node* GraphAssembler::Int32Constant(int32_t value) {
return AddClonedNode(mcgraph()->Int32Constant(value));
}
@ -709,6 +713,18 @@ Node* GraphAssembler::LoadUnaligned(MachineType type, Node* object,
return AddNode(graph()->NewNode(op, object, offset, effect(), control()));
}
Node* GraphAssembler::ProtectedStore(MachineRepresentation rep, Node* object,
Node* offset, Node* value) {
return AddNode(graph()->NewNode(machine()->ProtectedStore(rep), object,
offset, value, effect(), control()));
}
Node* GraphAssembler::ProtectedLoad(MachineType type, Node* object,
Node* offset) {
return AddNode(graph()->NewNode(machine()->ProtectedLoad(type), object,
offset, effect(), control()));
}
Node* GraphAssembler::Retain(Node* buffer) {
return AddNode(graph()->NewNode(common()->Retain(), buffer, effect()));
}

5
src/compiler/graph-assembler.h
View File

@ -237,6 +237,7 @@ class V8_EXPORT_PRIVATE GraphAssembler {
// Value creation.
Node* IntPtrConstant(intptr_t value);
Node* UintPtrConstant(uintptr_t value);
Node* Uint32Constant(uint32_t value);
Node* Int32Constant(int32_t value);
Node* Int64Constant(int64_t value);
@ -304,6 +305,10 @@ class V8_EXPORT_PRIVATE GraphAssembler {
Node* value);
Node* LoadUnaligned(MachineType type, Node* object, Node* offset);
Node* ProtectedStore(MachineRepresentation rep, Node* object, Node* offset,
Node* value);
Node* ProtectedLoad(MachineType type, Node* object, Node* offset);
Node* Retain(Node* buffer);
Node* UnsafePointerAdd(Node* base, Node* external);

77
src/compiler/wasm-compiler.cc
View File

@ -3473,8 +3473,7 @@ Node* WasmGraphBuilder::MemBuffer(uintptr_t offset) {
Node* mem_start = instance_cache_->mem_start;
DCHECK_NOT_NULL(mem_start);
if (offset == 0) return mem_start;
return graph()->NewNode(mcgraph()->machine()->IntAdd(), mem_start,
mcgraph()->UintPtrConstant(offset));
return gasm_->IntAdd(mem_start, gasm_->UintPtrConstant(offset));
}
Node* WasmGraphBuilder::CurrentMemoryPages() {
@ -3623,9 +3622,8 @@ Node* WasmGraphBuilder::TableSet(uint32_t table_index, Node* index, Node* val,
Node* call_target = mcgraph()->RelocatableIntPtrConstant(
wasm::WasmCode::kWasmTableSet, RelocInfo::WASM_STUB_CALL);
return SetEffectControl(graph()->NewNode(
mcgraph()->common()->Call(call_descriptor), call_target,
mcgraph()->IntPtrConstant(table_index), index, val, effect(), control()));
return gasm_->Call(call_descriptor, call_target,
gasm_->IntPtrConstant(table_index), index, val);
}
Node* WasmGraphBuilder::CheckBoundsAndAlignment(
@ -3655,16 +3653,12 @@ Node* WasmGraphBuilder::CheckBoundsAndAlignment(
// Unlike regular memory accesses, atomic memory accesses should trap if
// the effective offset is misaligned.
// TODO(wasm): this addition is redundant with one inserted by {MemBuffer}.
Node* effective_offset = graph()->NewNode(mcgraph()->machine()->IntAdd(),
MemBuffer(capped_offset), index);
Node* effective_offset = gasm_->IntAdd(MemBuffer(capped_offset), index);
Node* cond =
graph()->NewNode(mcgraph()->machine()->WordAnd(), effective_offset,
mcgraph()->IntPtrConstant(align_mask));
gasm_->WordAnd(effective_offset, gasm_->IntPtrConstant(align_mask));
TrapIfFalse(wasm::kTrapUnalignedAccess,
graph()->NewNode(mcgraph()->machine()->Word32Equal(), cond,
mcgraph()->Int32Constant(0)),
position);
gasm_->Word32Equal(cond, gasm_->Int32Constant(0)), position);
return index;
}
@ -3690,7 +3684,7 @@ Node* WasmGraphBuilder::BoundsCheckMem(uint8_t access_size, Node* index,
env_->max_memory_size)) {
// The access will be out of bounds, even for the largest memory.
TrapIfEq32(wasm::kTrapMemOutOfBounds, Int32Constant(0), 0, position);
return mcgraph()->UintPtrConstant(0);
return gasm_->UintPtrConstant(0);
}
uintptr_t end_offset = offset + access_size - 1u;
Node* end_offset_node = mcgraph_->UintPtrConstant(end_offset);
@ -3704,12 +3698,11 @@ Node* WasmGraphBuilder::BoundsCheckMem(uint8_t access_size, Node* index,
// - computing {effective_size} as {mem_size - end_offset} and
// - checking that {index < effective_size}.
auto m = mcgraph()->machine();
Node* mem_size = instance_cache_->mem_size;
if (end_offset >= env_->min_memory_size) {
// The end offset is larger than the smallest memory.
// Dynamically check the end offset against the dynamic memory size.
Node* cond = graph()->NewNode(m->UintLessThan(), end_offset_node, mem_size);
Node* cond = gasm_->UintLessThan(end_offset_node, mem_size);
TrapIfFalse(wasm::kTrapMemOutOfBounds, cond, position);
} else {
// The end offset is smaller than the smallest memory, so only one check is
@ -3726,18 +3719,17 @@ Node* WasmGraphBuilder::BoundsCheckMem(uint8_t access_size, Node* index,
}
// This produces a positive number, since {end_offset < min_size <= mem_size}.
Node* effective_size =
graph()->NewNode(m->IntSub(), mem_size, end_offset_node);
Node* effective_size = gasm_->IntSub(mem_size, end_offset_node);
// Introduce the actual bounds check.
Node* cond = graph()->NewNode(m->UintLessThan(), index, effective_size);
Node* cond = gasm_->UintLessThan(index, effective_size);
TrapIfFalse(wasm::kTrapMemOutOfBounds, cond, position);
if (untrusted_code_mitigations_) {
// In the fallthrough case, condition the index with the memory mask.
Node* mem_mask = instance_cache_->mem_mask;
DCHECK_NOT_NULL(mem_mask);
index = graph()->NewNode(m->WordAnd(), index, mem_mask);
index = gasm_->WordAnd(index, mem_mask);
}
return index;
}
@ -3836,7 +3828,7 @@ Node* WasmGraphBuilder::TraceMemoryOperation(bool is_store,
TNode<RawPtrT> info =
gasm_->StackSlot(sizeof(wasm::MemoryTracingInfo), kAlign);
Node* address = gasm_->IntAdd(mcgraph()->UintPtrConstant(offset), index);
Node* address = gasm_->IntAdd(gasm_->UintPtrConstant(offset), index);
auto store = [&](int field_offset, MachineRepresentation rep, Node* data) {
gasm_->Store(StoreRepresentation(rep, kNoWriteBarrier), info,
gasm_->Int32Constant(field_offset), data);
@ -4062,25 +4054,17 @@ Node* WasmGraphBuilder::LoadMem(wasm::ValueType type, MachineType memtype,
if (memtype.representation() == MachineRepresentation::kWord8 ||
mcgraph()->machine()->UnalignedLoadSupported(memtype.representation())) {
if (use_trap_handler()) {
load = graph()->NewNode(mcgraph()->machine()->ProtectedLoad(memtype),
MemBuffer(capped_offset), index, effect(),
control());
load = gasm_->ProtectedLoad(memtype, MemBuffer(capped_offset), index);
SetSourcePosition(load, position);
} else {
load = graph()->NewNode(mcgraph()->machine()->Load(memtype),
MemBuffer(capped_offset), index, effect(),
control());
load = gasm_->Load(memtype, MemBuffer(capped_offset), index);
}
} else {
// TODO(eholk): Support unaligned loads with trap handlers.
DCHECK(!use_trap_handler());
load =
graph()->NewNode(mcgraph()->machine()->UnalignedLoad(memtype),
MemBuffer(capped_offset), index, effect(), control());
load = gasm_->LoadUnaligned(memtype, MemBuffer(capped_offset), index);
}
SetEffect(load);
#if defined(V8_TARGET_BIG_ENDIAN)
load = BuildChangeEndiannessLoad(load, memtype, type);
#endif
@ -4088,14 +4072,9 @@ Node* WasmGraphBuilder::LoadMem(wasm::ValueType type, MachineType memtype,
if (type == wasm::kWasmI64 &&
ElementSizeInBytes(memtype.representation()) < 8) {
// TODO(titzer): TF zeroes the upper bits of 64-bit loads for subword sizes.
if (memtype.IsSigned()) {
// sign extend
load = graph()->NewNode(mcgraph()->machine()->ChangeInt32ToInt64(), load);
} else {
// zero extend
load =
graph()->NewNode(mcgraph()->machine()->ChangeUint32ToUint64(), load);
}
load = memtype.IsSigned()
? gasm_->ChangeInt32ToInt64(load) // sign extend
: gasm_->ChangeUint32ToUint64(load); // zero extend
}
if (FLAG_trace_wasm_memory) {
@ -4128,27 +4107,20 @@ Node* WasmGraphBuilder::StoreMem(MachineRepresentation mem_rep, Node* index,
if (mem_rep == MachineRepresentation::kWord8 ||
mcgraph()->machine()->UnalignedStoreSupported(mem_rep)) {
if (use_trap_handler()) {
store = graph()->NewNode(mcgraph()->machine()->ProtectedStore(mem_rep),
MemBuffer(capped_offset), index, val, effect(),
control());
store =
gasm_->ProtectedStore(mem_rep, MemBuffer(capped_offset), index, val);
SetSourcePosition(store, position);
} else {
StoreRepresentation rep(mem_rep, kNoWriteBarrier);
store = graph()->NewNode(mcgraph()->machine()->Store(rep),
MemBuffer(capped_offset), index, val, effect(),
control());
store = gasm_->Store(StoreRepresentation{mem_rep, kNoWriteBarrier},
MemBuffer(capped_offset), index, val);
}
} else {
// TODO(eholk): Support unaligned stores with trap handlers.
DCHECK(!use_trap_handler());
UnalignedStoreRepresentation rep(mem_rep);
store = graph()->NewNode(mcgraph()->machine()->UnalignedStore(rep),
MemBuffer(capped_offset), index, val, effect(),
control());
store = gasm_->StoreUnaligned(rep, MemBuffer(capped_offset), index, val);
}
SetEffect(store);
if (FLAG_trace_wasm_memory) {
TraceMemoryOperation(true, mem_rep, index, capped_offset, position);
}
@ -5184,8 +5156,7 @@ Node* WasmGraphBuilder::AtomicOp(wasm::WasmOpcode opcode, Node* const* inputs,
}
// After we've bounds-checked, compute the effective address.
Node* address = graph()->NewNode(mcgraph()->machine()->IntAdd(),
mcgraph()->UintPtrConstant(offset), index);
Node* address = gasm_->IntAdd(gasm_->UintPtrConstant(capped_offset), index);
switch (opcode) {
case wasm::kExprAtomicNotify: {