mirror of
https://github.com/ethereum/solidity
synced 2023-10-03 13:03:40 +00:00
377 lines
11 KiB
C++
377 lines
11 KiB
C++
/*
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This file is part of solidity.
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solidity is free software: you can redistribute it and/or modify
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it under the terms of the GNU General Public License as published by
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the Free Software Foundation, either version 3 of the License, or
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(at your option) any later version.
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solidity is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with solidity. If not, see <http://www.gnu.org/licenses/>.
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*/
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/**
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* Translates Yul code from EVM dialect to eWasm dialect.
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*/
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#include <libyul/backends/wasm/EVMToEWasmTranslator.h>
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#include <libyul/backends/wasm/WordSizeTransform.h>
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#include <libyul/backends/wasm/WasmDialect.h>
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#include <libyul/optimiser/ExpressionSplitter.h>
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#include <libyul/optimiser/FunctionGrouper.h>
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#include <libyul/optimiser/MainFunction.h>
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#include <libyul/optimiser/FunctionHoister.h>
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#include <libyul/optimiser/Disambiguator.h>
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#include <libyul/optimiser/NameDisplacer.h>
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#include <libyul/AsmParser.h>
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#include <libyul/AsmAnalysis.h>
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#include <libyul/AsmAnalysisInfo.h>
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#include <libyul/Object.h>
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#include <liblangutil/ErrorReporter.h>
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#include <liblangutil/Scanner.h>
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#include <liblangutil/SourceReferenceFormatter.h>
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using namespace std;
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using namespace dev;
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using namespace yul;
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using namespace langutil;
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namespace
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{
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static string const polyfill{R"({
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function or_bool(a, b, c, d) -> r {
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r := i64.ne(0, i64.or(i64.or(a, b), i64.or(c, d)))
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}
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// returns a + y + c plus carry value on 64 bit values.
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// c should be at most 2
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function add_carry(x, y, c) -> r, r_c {
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let t := i64.add(x, y)
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r := i64.add(t, c)
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r_c := i64.or(
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i64.lt_u(t, x),
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i64.lt_u(r, t)
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)
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}
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function add(x1, x2, x3, x4, y1, y2, y3, y4) -> r1, r2, r3, r4 {
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let carry
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r4, carry := add_carry(x4, y4, 0)
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r3, carry := add_carry(x3, y3, carry)
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r2, carry := add_carry(x2, y2, carry)
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r1, carry := add_carry(x1, y1, carry)
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}
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function bit_negate(x) -> y {
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y := i64.xor(x, 0xffffffffffffffff)
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}
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function sub(x1, x2, x3, x4, y1, y2, y3, y4) -> r1, r2, r3, r4 {
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// x - y = x + (~y + 1)
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let carry
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r4, carry := add_carry(x4, bit_negate(y4), 1)
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r3, carry := add_carry(x3, bit_negate(y3), i64.add(carry, 1))
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r2, carry := add_carry(x2, bit_negate(y2), i64.add(carry, 1))
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r1, carry := add_carry(x1, bit_negate(y1), i64.add(carry, 1))
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}
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function split(x) -> hi, lo {
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hi := i64.shr_u(x, 32)
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lo := i64.and(x, 0xffffffff)
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}
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// Multiplies two 64 bit values resulting in a 128 bit
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// value split into two 64 bit values.
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function mul_64x64_128(x, y) -> hi, lo {
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let xh, xl := split(x)
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let yh, yl := split(y)
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let t0 := i64.mul(xl, yl)
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let t1 := i64.mul(xh, yl)
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let t2 := i64.mul(xl, yh)
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let t3 := i64.mul(xh, yh)
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let t0h, t0l := split(t0)
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let u1 := i64.add(t1, t0h)
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let u1h, u1l := split(u1)
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let u2 := i64.add(t2, u1l)
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lo := i64.or(i64.shl(u2, 32), t0l)
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hi := i64.add(t3, i64.add(i64.shr_u(u2, 32), u1h))
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}
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// Add three 64-bit values plus carry (at most 2).
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// Return the sum and the new carry value.
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function add3_carry(a, b, c, carr) -> x, carry {
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let c1, c2
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x, c1 := add_carry(a, b, carr)
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x, c2 := add_carry(x, c, 0)
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carry := i64.add(c1, c2)
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}
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// Multiplies two 128 bit values resulting in a 256 bit
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// value split into four 64 bit values.
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function mul_128x128_256(x1, x2, y1, y2) -> r1, r2, r3, r4 {
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let ah, al := mul_64x64_128(x1, y1)
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let bh, bl := mul_64x64_128(x1, y2)
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let ch, cl := mul_64x64_128(x2, y1)
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let dh, dl := mul_64x64_128(x2, y2)
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let carry
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r4 := dl
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r3, carry := add3_carry(bl, cl, dh, 0)
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r2, carry := add3_carry(al, bh, ch, carry)
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r1 := i64.add(ah, carry)
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}
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function mul(x1, x2, x3, x4, y1, y2, y3, y4) -> r1, r2, r3, r4 {
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}
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function div(x1, x2, x3, x4, y1, y2, y3, y4) -> r1, r2, r3, r4 {}
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function mod(x1, x2, x3, x4, y1, y2, y3, y4) -> r1, r2, r3, r4 {}
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function smod(x1, x2, x3, x4, y1, y2, y3, y4) -> r1, r2, r3, r4 {}
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function exp(x1, x2, x3, x4, y1, y2, y3, y4) -> r1, r2, r3, r4 {}
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function byte(x1, x2, x3, x4, y1, y2, y3, y4) -> r1, r2, r3, r4 {
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if i64.eqz(i64.or(i64.or(x1, x2), x3)) {
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let component
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switch i64.div_u(x4, 8)
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case 0 { component := y1 }
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case 1 { component := y2 }
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case 2 { component := y3 }
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case 3 { component := y4 }
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x4 := i64.mul(i64.rem_u(x4, 8), 8)
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r4 := i64.shr_u(component, i64.sub(56, x4))
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r4 := i64.and(0xff, r4)
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}
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}
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function xor(x1, x2, x3, x4, y1, y2, y3, y4) -> r1, r2, r3, r4 {
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r1 := i64.xor(x1, y1)
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r2 := i64.xor(x2, y2)
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r3 := i64.xor(x3, y3)
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r4 := i64.xor(x4, y4)
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}
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function or(x1, x2, x3, x4, y1, y2, y3, y4) -> r1, r2, r3, r4 {
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r1 := i64.or(x1, y1)
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r2 := i64.or(x2, y2)
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r3 := i64.or(x3, y3)
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r4 := i64.or(x4, y4)
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}
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function and(x1, x2, x3, x4, y1, y2, y3, y4) -> r1, r2, r3, r4 {
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r1 := i64.and(x1, y1)
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r2 := i64.and(x2, y2)
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r3 := i64.and(x3, y3)
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r4 := i64.and(x4, y4)
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}
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function not(x1, x2, x3, x4) -> r1, r2, r3, r4 {
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let mask := 0xffffffffffffffff
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r1, r2, r3, r4 := xor(x1, x2, x3, x4, mask, mask, mask, mask)
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}
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function iszero(x1, x2, x3, x4) -> r1, r2, r3, r4 {
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r4 := i64.eqz(i64.or(i64.or(x1, x2), i64.or(x3, x4)))
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}
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function eq(x1, x2, x3, x4, y1, y2, y3, y4) -> r1, r2, r3, r4 {
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if i64.eq(x1, y1) {
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if i64.eq(x2, y2) {
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if i64.eq(x3, y3) {
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if i64.eq(x4, y4) {
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r4 := 1
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}
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}
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}
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}
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}
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// TODO
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function lt(x1, x2, x3, x4, y1, y2, y3, y4) -> z1, z2, z3, z4 {}
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function gt(x1, x2, x3, x4, y1, y2, y3, y4) -> z1, z2, z3, z4 {}
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function slt(x1, x2, x3, x4, y1, y2, y3, y4) -> z1, z2, z3, z4 {}
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function sgt(x1, x2, x3, x4, y1, y2, y3, y4) -> z1, z2, z3, z4 {}
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function shl(x1, x2, x3, x4, y1, y2, y3, y4) -> z1, z2, z3, z4 {}
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function shr(x1, x2, x3, x4, y1, y2, y3, y4) -> z1, z2, z3, z4 {}
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function sar(x1, x2, x3, x4, y1, y2, y3, y4) -> z1, z2, z3, z4 {}
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function addmod(x1, x2, x3, x4, y1, y2, y3, y4) -> z1, z2, z3, z4 {}
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function mulmod(x1, x2, x3, x4, y1, y2, y3, y4) -> z1, z2, z3, z4 {}
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function signextend(x1, x2, x3, x4, y1, y2, y3, y4) -> z1, z2, z3, z4 {}
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function keccak256(x1, x2, x3, x4, y1, y2, y3, y4) -> z1, z2, z3, z4 {}
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function address() -> z1, z2, z3, z4 {}
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function balance(x1, x2, x3, x4) -> z1, z2, z3, z4 {}
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function origin() -> z1, z2, z3, z4 {}
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function caller() -> z1, z2, z3, z4 {}
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function callvalue() -> z1, z2, z3, z4 {}
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function calldataload(x1, x2, x3, x4) -> z1, z2, z3, z4 {}
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function calldatasize() -> z1, z2, z3, z4 {}
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function calldatacopy(x1, x2, x3, x4, y1, y2, y3, y4, z1, z2, z3, z4) {}
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// Needed?
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function codesize() -> z1, z2, z3, z4 {}
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function codecopy(x1, x2, x3, x4, y1, y2, y3, y4, z1, z2, z3, z4) {}
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function datacopy(x1, x2, x3, x4, y1, y2, y3, y4, z1, z2, z3, z4) {}
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function gasprice() -> z1, z2, z3, z4 {}
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function extcodesize(x1, x2, x3, x4) -> z1, z2, z3, z4 {}
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function extcodehash(x1, x2, x3, x4) -> z1, z2, z3, z4 {}
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function extcodecopy(x1, x2, x3, x4, y1, y2, y3, y4, z1, z2, z3, z4) {}
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function returndatasize() -> z1, z2, z3, z4 {}
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function returndatacopy(x1, x2, x3, x4, y1, y2, y3, y4, z1, z2, z3, z4) {}
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function blockhash(x1, x2, x3, x4) -> z1, z2, z3, z4 {}
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function coinbase() -> z1, z2, z3, z4 {}
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function timestamp() -> z1, z2, z3, z4 {}
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function number() -> z1, z2, z3, z4 {}
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function difficulty() -> z1, z2, z3, z4 {}
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function gaslimit() -> z1, z2, z3, z4 {}
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function pop(x1, x2, x3, x4) {}
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function mload(x1, x2, x3, x4) -> z1, z2, z3, z4 {}
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function mstore(x1, x2, x3, x4, y1, y2, y3, y4) {}
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function mstore8(x1, x2, x3, x4, y1, y2, y3, y4) {}
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// Needed?
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function msize() -> z1, z2, z3, z4 {}
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function sload(x1, x2, x3, x4) -> z1, z2, z3, z4 {}
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function sstore(x1, x2, x3, x4, y1, y2, y3, y4) {}
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// Needed?
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function pc() -> z1, z2, z3, z4 {}
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function gas() -> z1, z2, z3, z4 {}
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function log0(p1, p2, p3, p4, s1, s2, s3, s4) {}
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function log1(
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p1, p2, p3, p4, s1, s2, s3, s4,
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t11, t12, t13, t14
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) {}
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function log2(
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p1, p2, p3, p4, s1, s2, s3, s4,
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t11, t12, t13, t14,
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t21, t22, t23, t24
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) {}
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function log3(
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p1, p2, p3, p4, s1, s2, s3, s4,
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t11, t12, t13, t14,
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t21, t22, t23, t24,
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t31, t32, t33, t34
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) {}
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function log4(
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p1, p2, p3, p4, s1, s2, s3, s4,
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t11, t12, t13, t14,
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t21, t22, t23, t24,
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t31, t32, t33, t34,
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t41, t42, t43, t44,
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) {}
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function create(x1, x2, x3, x4, y1, y2, y3, y4, z1, z2, z3, z4) -> a1, a2, a3, a4 {}
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function call(
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a1, a2, a3, a4,
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b1, b2, b3, b4,
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c1, c2, c3, c4,
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d1, d2, d3, d4,
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e1, e2, e3, e4,
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f1, f2, f3, f4,
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g1, g2, g3, g4
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) -> x1, x2, x3, x4 {}
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function callcode(
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a1, a2, a3, a4,
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b1, b2, b3, b4,
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c1, c2, c3, c4,
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d1, d2, d3, d4,
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e1, e2, e3, e4,
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f1, f2, f3, f4,
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g1, g2, g3, g4
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) -> x1, x2, x3, x4 {}
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function delegatecall(
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a1, a2, a3, a4,
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b1, b2, b3, b4,
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c1, c2, c3, c4,
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d1, d2, d3, d4,
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e1, e2, e3, e4,
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f1, f2, f3, f4
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) -> x1, x2, x3, x4 {}
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function staticcall(
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a1, a2, a3, a4,
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b1, b2, b3, b4,
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c1, c2, c3, c4,
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d1, d2, d3, d4,
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e1, e2, e3, e4,
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f1, f2, f3, f4
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) -> x1, x2, x3, x4 {}
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function create2(
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a1, a2, a3, a4,
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b1, b2, b3, b4,
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c1, c2, c3, c4,
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d1, d2, d3, d4
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) -> x1, x2, x3, x4 {}
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function selfdestruct(a1, a2, a3, a4) {}
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function return(x1, x2, x3, x4, y1, y2, y3, y4) {}
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function revert(x1, x2, x3, x4, y1, y2, y3, y4) {}
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function invalid() {
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unreachable()
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}
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})"};
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}
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Object EVMToEWasmTranslator::run(Object const& _object)
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{
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if (!m_polyfill)
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parsePolyfill();
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Block ast = boost::get<Block>(Disambiguator(m_dialect, *_object.analysisInfo)(*_object.code));
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NameDispenser nameDispenser{m_dialect, ast};
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FunctionHoister{}(ast);
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FunctionGrouper{}(ast);
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MainFunction{}(ast);
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ExpressionSplitter{m_dialect, nameDispenser}(ast);
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WordSizeTransform::run(m_dialect, ast, nameDispenser);
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NameDisplacer{nameDispenser, m_polyfillFunctions}(ast);
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for (auto const& st: m_polyfill->statements)
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ast.statements.emplace_back(ASTCopier{}.translate(st));
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Object ret;
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ret.code = make_shared<Block>(move(ast));
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ret.analysisInfo = make_shared<AsmAnalysisInfo>();
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ErrorList errors;
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ErrorReporter errorReporter(errors);
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AsmAnalyzer analyzer(*ret.analysisInfo, errorReporter, boost::none, WasmDialect::instance());
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if (!analyzer.analyze(*ret.code))
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{
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// TODO the errors here are "wrong" because they have invalid source references!
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string message;
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for (auto const& err: errors)
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message += langutil::SourceReferenceFormatter::formatErrorInformation(*err);
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yulAssert(false, message);
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}
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for (auto const& subObjectNode: _object.subObjects)
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if (Object const* subObject = dynamic_cast<Object const*>(subObjectNode.get()))
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ret.subObjects.push_back(make_shared<Object>(run(*subObject)));
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else
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ret.subObjects.push_back(make_shared<Data>(dynamic_cast<Data const&>(*subObjectNode)));
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ret.subIndexByName = _object.subIndexByName;
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return ret;
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}
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void EVMToEWasmTranslator::parsePolyfill()
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{
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ErrorList errors;
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ErrorReporter errorReporter(errors);
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shared_ptr<Scanner> scanner{make_shared<Scanner>(CharStream(polyfill, ""))};
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m_polyfill = Parser(errorReporter, WasmDialect::instance()).parse(scanner, false);
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if (!errors.empty())
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{
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string message;
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for (auto const& err: errors)
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message += langutil::SourceReferenceFormatter::formatErrorInformation(*err);
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yulAssert(false, message);
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}
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m_polyfillFunctions.clear();
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for (auto const& statement: m_polyfill->statements)
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m_polyfillFunctions.insert(boost::get<FunctionDefinition>(statement).name);
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}
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