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Merge pull request #9140 from ethereum/wasm-binary-fix-memory-immediate-alignment

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Fix wrong alignment for Wasm store/load with 8-, 16- and 32-bit arguments
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Leonardo 2020-06-09 10:42:21 +02:00 committed by GitHub
commit 1e8e0ebd13
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GPG Key ID: 4AEE18F83AFDEB23
7 changed files with 45 additions and 4 deletions
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8
libyul/backends/wasm/BinaryTransform.cpp
View File

@ -336,8 +336,12 @@ bytes BinaryTransform::operator()(BuiltinCall const& _call)
_call.functionName.find(".load") != string::npos ||
_call.functionName.find(".store") != string::npos
)
// alignment and offset
ret += bytes{{3, 0}};
// Alignment hint and offset. Interpreters ignore the alignment. JITs/AOTs can take it
// into account to generate more efficient code but if the hint is invalid it could
// actually be more expensive. It's best to hint at 1-byte alignment if we don't plan
// to control the memory layout accordingly.
ret += bytes{{0, 0}}; // 2^0 == 1-byte alignment
return ret;
}
}

2
test/cmdlineTests/evm_to_wasm/output
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@ -45,7 +45,7 @@ object "object" {
Binary representation:
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
Text representation:
(module

2
test/cmdlineTests/evm_to_wasm_break/output
View File

@ -154,7 +154,7 @@ object "object" {
Binary representation:
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Text representation:
(module

1
test/cmdlineTests/wasm_to_wasm_memory_instructions_alignment/args Normal file
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@ -0,0 +1 @@
--yul --yul-dialect ewasm --machine ewasm

1
test/cmdlineTests/wasm_to_wasm_memory_instructions_alignment/err Normal file
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@ -0,0 +1 @@
Warning: Yul is still experimental. Please use the output with care.

8
test/cmdlineTests/wasm_to_wasm_memory_instructions_alignment/input.yul Normal file
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@ -0,0 +1,8 @@
object "object" {
code {
function main()
{
i64.store8(0x01:i32, 42:i64)
}
}
}

27
test/cmdlineTests/wasm_to_wasm_memory_instructions_alignment/output Normal file
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@ -0,0 +1,27 @@
======= wasm_to_wasm_memory_instructions_alignment/input.yul (Ewasm) =======
Pretty printed source:
object "object" {
code {
function main()
{ i64.store8(0x01:i32, 42) }
}
}
Binary representation:
0061736d01000000010401600000020100030201000503010001060100071102066d656d6f72790200046d61696e00000a0f010d0002404201a7422a3c00000b0b
Text representation:
(module
(memory $memory (export "memory") 1)
(export "main" (func $main))
(func $main
(block $label_
(i64.store8 (i32.wrap_i64 (i64.const 1)) (i64.const 42))
)
)
)