Better number generation strategy

[alexeuler]

Motivation

Current uint generation strategy doesn't give good number coverage and doesn't catch even simple edge cases. This is discussed in #387

Solution

Create a new strategy for uint. The strategy combines 3 different strategies, each assigned a specific weight:

1. Generate purely random value in a range. This will first choose bit size uniformly (up bitsparam). Then generate a value for this bit size.
2. Generate a random value around the edges (+/- 3 around 0 and max possible value)
3. Generate a value from a predefined fixtures set (this is helpful for taking the values from evm executuon state)

Results

The new strategy was tested on the following contract:

pragma solidity ^0.8.0;

import "./DsTest.sol";

contract TestNumbers is DSTest {
    function testPositive(uint256) public {
        assertTrue(true);
    }

    function testNegativeHalf(uint256 val) public {
        assertTrue(val < 2 ** 128 - 1);
    }

    function testNegative0(uint256 val) public {
        assertTrue(val != 0);
    }

    function testNegative2(uint256 val) public {
        assertTrue(val != 2);
    }

    function testNegative2Max(uint256 val) public {
        assertTrue(val != type(uint256).max - 2);
    }

    function testNegativeMax(uint256 val) public {
        assertTrue(val != type(uint256).max);
    }

    function testEquality(uint256 x, uint256 y) public {
        uint256 xy;

        unchecked {
            xy = x * y;
        }

        if ((x != 0 && xy / x != y)) return;

        assertEq(((xy - 1) / 1e18) + 1, (xy - 1) / (1e18 + 1));
    }
}

The results for test cases that should fail:

	Actual simplest failing case	New Strategy: Simplest failing case	Old Strategy: Simplest failing case
testNegativeHalf	2 ** 128 - 1	2 ** 128 - 1	2 ** 128
testNegative0	0	0	Doesn't work
testNegative2	2	2	Doesn't work
testNegative2Max	2 ** 256 - 3	2 ** 256 - 3	Doesn't work
testNegativeMax	2 ** 256 - 1	2 ** 256 - 1	Doesn't work
testEquality		0, 3	Doesn't work

Also for testPositive the random test cases seems to have much better coverage:

New strategy

/// Edge cases
[0,
 0,
 0,
 0,
 0,
 0,
 1,
 2,
 2,
 2,
 2,
 2,
 2,
 2,
 2,
 3,
 3,
 14,
/// Fixtures
 42,
 42,
 42,
 42,
 42,
 42,
 42,
 42,
 42,
 42,
 42,
 42,
 42,
 42,
 42,
 42,
 42,
 42,
 42,
 42,
 42,
 42,
 42,
 42,
 42,
 42,
 42,
 42,
 42,
 42,
 42,
 42,
 42,
 42,
 42,
 42,
 42,
 42,
 42,
 42,
 42,
 42,
 42,
 42,
 42,
 42,
 42,
 42,
 43,
 43,
 43,
 43,
 43,
 43,
 43,
 43,
 43,
 43,
 43,
 43,
 43,
 43,
 43,
 43,
 43,
 43,
 43,
 43,
 43,
 43,
 43,
 43,
 43,
 43,
 43,
 43,
 43,
 43,
 43,
 43,
 43,
 43,
 43,
 43,
 43,
 43,
 43,
 43,
 43,
 43,
 43,
 43,
 43,
 43,
 43,
 43,
 43,
 43,
 43,
/// Randoms
 362,
 516,
 1120,
 1983,
 2760,
 3585,
 3823,
 10523,
 43672,
 238225,
 3626729,
 224284888,
 494423685,
 971025881,
 2888328457,
 19519174016,
 30184947189,
 33396775196,
 56821726909,
 689351498871,
 1190816741152,
 1572831182273,
 1591727194015,
 3826546332976,
 249543156942240,
 798311978216765,
 3373273342330838,
 10918911084916060,
 50189871435753677,
 439725383077241022,
 3401696951181245404,
 157496432936802028161,
 2475231153114891158999,
 105909393431246995593069996,
 107913729131805239501602104,
 24631520462805559999770369544,
 264575694087087137389232101050,
 772619611430724619639690567891,
 25810618386653091334149509441325,
 35915034238800349492931614605635,
 153506003836326203094346956829482,
 280873127667185661829222071797230,
 348010450494708774993655163931128,
 7646506327056416587716103348256532,
 15464545752295587733889458682609054,
 36783397758511900616387809774631785,
 97242441411817996925069849266888622,
 147024006770563177609312099458628927,
 188121887855574525305144619055921663,
 294267473426187474747849162104267339,
 12724229308417247999730640201484862607,
 41014563812140591401469939715597749206,
 156238440400277946256505430414263332398,
 166765039863853147931449965207370754419,
 1612415668463703462047366750421648918542,
 9908927435109728333625167925598760060978,
 10236965621329184275422787688640537603424,
 31494523084140425955552978549740706561713,
 145896957048859625465331260947454550686895,
 2238492176002143802154295483195393306607489,
 2660533239178328320330692574533173796089207,
 3875298189000802595481276526739996399445352,
 41253755041548665158665352072168402956844604,
 422943545645126455580859345909514636244314873,
 4999417872146633167473658301209717350299941294,
 42678878196096467200534716644006140216153080986,
 73553348673874374231363032938940863498528392656,
 483784367006201018773058818081161556557759349649,
 774808749789481306668324116495307910856771895702,
 908847594477485735591396633334039779589105452351,
 1262182116835146393282622336113040120220695823557,
 3329270524375098468910898521360960753226504223783,
 3333194114900161925274498029582379652285031451877,
 4484957434972620090665048730245031768309952819964,
 5145409819232473991434653933523417039570520313943,
 19464760408319993244613164353807065092392295101253,
 94545897941650761447024922888213559969940232943899,
 337470395661202575662318275605509436970557341018103,
 585707160440833113127889378837557262626096740931953,
 24675058081760600058539159792343952141141279524037099,
 24693393888541712700369296852522042203731352049360635,
 43059652374527114156027031453657075997130860134060441,
 269545940812941710519360602854087382977217091144974454,
 2736173204671970310280131504797900563536755779315861147,
 7585906577758645185939204117101805431316119795885588896,
 33643705350635296300819922614197587563522030511778036139,
 40032055533762922159402968666283302464274464144923691558,
 105329440441726119029792299829277042856522968630327268931,
 389507037207441101784969622969498565152282121345399912898,
 9197023485487217168386170149318496992322357660912816895928,
 63801834251340751471942147909651277976280476380096593343498,
 89759368211746996493899901894807549508400975163659912560469,
 11564042667181017501113110131615327390144857528086108829035938,
 153517312332071445578332558429419487433099243064802539820541823,
 498549209783301696727706981293591805749770224824890247634359953,
 756811607379857002698587296372743329408009190047460551482856459,
 1752098029480478965257477307012843483667278095656875086266774124,
 3392734207135717592412363460475926260240793532828134423027162734,
 9233700333011670390951211460577308474680443838961552150737192105,
 177833816274340328629934599844888363890654985691221246047768165741,
 304945838058022981508612894265691082275151317069149827616755125668,
 1192324827720452324949310219536112745636227566373302366565379083793,
 1553833874442004385184794115206805717524058675081061332727524907963,
 5042197305867743650008384211331080110564829168804442539974363464481,
 23028419957613895322950954273368266023629068017559103557745414248086,
 24161758178766814440807498232474608720723424436663115147226324786949,
 71146866016584996348526549371428773883039228160645422744616057724977,
 393029566373024173188227121833346144672826890067408893880564491145150,
 774674628535569613958038000994363892071296911046562735013643101784688,
 12613298676762947553352770285147304609152249108003791881467615352343351,
 26656048534039732624971028050044574640844635346076931983212285275712136,
 68422598250788211161165661498169242292988820156910420498009277042385031,
 256617890012953052738992627600607351153778429589727924310472202100958499,
 616970969673537699119375656717930760404807959003040730274126076713377039,
 1555708305164875762757615680564475585448617155478848596221908856216367409,
 4054903716437203972896858030663045427440725614625622617583124788733779570,
 6865905988385269572457253830501532729958116142363164033207340240576944376,
 12149691792560093164802418591014018621430198390474718925395548613494311534,
 40075592997550927721721307224428429558167630595113397027314467597041717692,
 97645443615448263228891435376312407256825228331928581250064254424864972300,
 334700497169719979843538055849453709550670251808812700026283322615592273541,
 377324214000696227091318659128408814806908706594473878876703907831739905599,
 653118130249510828764236419959345954288971153320462048408042919236571719221,
 880545739739058157244327127571071199972625550212799644334011478745870822392,
 1720832386996471385647959087994963156388682097580943821771954323744187554529,
 6452590156306434120454252602081937759544560305921174907743631493649951934141,
 21100963070613437129259458410956980990254921083177423324612011912088642821609,
 74426764287200419770528502184548186513942454060601551250796841729950058290695,
/// Edge cases max
 115792089237316195423570985008687907853269984665640564039457584007913129639932,
 115792089237316195423570985008687907853269984665640564039457584007913129639932,
 115792089237316195423570985008687907853269984665640564039457584007913129639933,
 115792089237316195423570985008687907853269984665640564039457584007913129639933,
 115792089237316195423570985008687907853269984665640564039457584007913129639933,
 115792089237316195423570985008687907853269984665640564039457584007913129639934,
 115792089237316195423570985008687907853269984665640564039457584007913129639934,
 115792089237316195423570985008687907853269984665640564039457584007913129639934,
 115792089237316195423570985008687907853269984665640564039457584007913129639934,
 115792089237316195423570985008687907853269984665640564039457584007913129639934,
 115792089237316195423570985008687907853269984665640564039457584007913129639935]

Vs for the old strategy:

[281368335871742058896344557338774872366766563217730231841881112605204297366,
 364822410079358517098224268071440248607348375692794793607380941113804777055,
 672546918269513596558989341105586824601417954154907112838697843942096072115,
 1058929417546455556233246085153574268617733563187603062185661582575200539884,
 1092250115363355029315423949983306203573813825245258733460692885814877920271,
 1148905770612565908942764344282703230821022417434948496101505120498027214698,
 1376812423925057181312682392286932517627608730990023207779301907339976433379,
 1492899683917851015748536704907582198298836984276999825727945053776533114317,
 1808744199665193641997057689707699216368520760052478956910956391197884522498,
 1958571702806888710012063123272840502862701217727393915196715353129947424076,
 2168993155629317088767724547657683354740032280211539000333066091983655670220,
 2763810300708239364220867386436066356474002186827096815495645107788964613207,
 3171591855418114543672984720824053335863495294407669936378497414555192490403,
 3281825919184007036803240420677646271649226306898480590161297221488479867585,
 3497590771933655892447939780122246331325116506860788485689038943171387636730,
 3826557156563115154683389372655937009655926939896027313824758732229923129451,
 4579516077608105408074339211434219170213662817212727535297377979600271632483,
 5446246782069213914253651610944338721802079918098320260719148715491608195214,
 5932969737937012243948273432522126579428716324596744281174506607127962488796,
 6311544616781286155276055527404781175064692735094515074196466338249915353149,
 6346203270542184858612425604930144102953958279911073206692806930554095634477,
 7899493556793752463222774499428460263452242096966653024114659269843492662490,
 8364790083911973872997656080820739544103725010120251021098742162223448126932,
 8750554909505181819817218930638035107066924889851540670200955925024256114010,
 9086806469735868838405155643054748929699018152314809329414034540279634447499,
 9159697622457886374861291477595908888655037434363816795334466611529934801194,
 9339173380425268301537757122582091850617639717748761800340416258367792311584,
 9498929518889314275512552652015129502824272294103307011837995724828047074263,
 10054799463480154843451883979490661185533100899721811398173740004023198333030,
 10408296871976604144918398094836227651526897410847601954730860995981171022862,
 10961164945340778977801392597259346498517256164748439439577835289550779305813,
 11518558759946908659554486496789172302980807213240614639144156799665805937192,
 11910656429264259647871356954919829837863369769412803195611650580161893436013,
 13150669723117534823866186514463756062383308257168157647769415591364761415869,
 13171927252148089006203868394680486434898735272468936811825858351483134948839,
 13652188683774563767623080422566939814967762017628319693408149886623951395351,
 13814864382323242911587132995070213956235512088028878887082521350669188445247,
 14182913814438305004677105116227046188391210899465524585858436203736789079401,
 14366199463224216598115465076397019374751081387237754021736755520500830327346,
 14423805840527037366275208846593509023820989939587385101858172830472045743399,
 15066893141453916759877882789958913776561147787935500156492509552224052251908,
 15391339551013475490557537292486825967382286728292267385064063110839585099287,
 15573986715396684706724423195611452505565172190124414493596296339175719289479,
 17677833654453513649000589822401808493196529390758876902680995846177435132814,
 18561862668387951005712882746995009019051260224489390064167195522246959640033,
 20021142367638015534160085305782504862845403233425126235255270055335088131984,
 20640301186947415938931578514758320065673703036454077651642548929382155683179,
 22319222890268341725435718561229697005870901031270292288387133677957650596589,
 23148493171636193021919936193151329680921981756965063608661003798887994564398,
 23184817459418149171968126449934370081208489693257798468115622065654614629563,
 23258435276857359381023641840909293908708502909665213251493352529768608982740,
 23260652949912882760782624414990222803960339140485239198683426350143602394677,
 23638099691346198176781533210386824075347115460207153706373234072928138925050,
 24426595524371211553628209027704712678799307826034427494723333556322184911961,
 24456630412345574391364687613548312056241373990338181971711417943886021095475,
 24746674332636135035269121052115974104068539413085015800280975988930162113401,
 25473315909537154447347952375895068692152001155486908453803041525321878223502,
 25911347865920576933842524420969391057340961522418305248476800394862660898934,
 25967765598957708945053105493271065963653529644327477537952740848446180541821,
 26832607465252822698265411110618675353029196647070667888758527550689749616729,
 27123572818448044498750896353580044717803483726032637665339461658913131406327,
 27247349778804082929025667032726185610311397580967808242668270516348999292619,
 27384565287182859703554086950836729588202814647841123081000148148267895519636,
 28340801795482741519762594709555123222933815562017994915028753492214825266691,
 29219914066073856605280322949654296453558511499864920642250344361526584336255,
 29265359622247104137979639142120501399068986141661920956412572211849680726802,
 29280594046728736609553405162773033307837589007063879321962164427722120036529,
 29997467047628624177308442824569385044050322175814184679907927154369711803723,
 30682222906125259400580255231366557944781731619425434138826715282632698043901,
 30852676781839119478675045080875923164525770388942767107622237666350213548354,
 31107972695526942525845926988246757406299476616560838149016617284976488403058,
 31172250332479584397895764366902431254599373326425828311160893255201046816444,
 31572956566523306186739943761422136355097061233698338004189552916988769582215,
 31587843994979503161964491457693441735991090405991509301502480698102039104999,
 32371606920989315333193431161614716202395129138327031565923220565145639863087,
 32407199309510237715450533004931429575352067036319705499325024626405254556166,
 33391131036069379263899471562894096489681848038064341567533912477083730642594,
 33865610434739098519788111402876908403934247179107768378257987360926051162120,
 33919552059474942281867920029540739260409681073522965784130136177487513645226,
 36447458907709573215068948724910956667308337810956797647261530206963539242540,
 36828163334778324604040323618534731799457845174497580586637690739647257755093,
 37500014065845627368479849098142753330418564357417717226433659854155805422614,
 37717108238667492519912787149320665314049376481189154978152569139132487578226,
 38343782611930866679454287707216079102949610076538935560712964921861227547106,
 40133864809537318716398559806056359612569253181449779008498225936076828228570,
 40461502892324216640568951782834701212866852047502260797745361381187677117655,
 40848436254656396609957027956780267397496811781252100233587741401305632143483,
 40909048946111117210354890813344354154191016557520019824834713739472053998344,
 41234356887539472631042490865834561172069217543778496826320568533045643430710,
 41366028451975118576983213813356514495315864549044508634374191231727914181786,
 41670743014812810180158456856101328679532407396450713457006497321824120659296,
 42564044510848505653485151886618641202870762031152586496754855686937751781422,
 43037105919295586364743208644659919867532947542634374031297371584598591856094,
 43667440895023489023430889436581291491855448456600882233941949498991383954455,
 43875452099997004626337974571919684899459793565828017349870376822162976894854,
 44719995685022428714498512789462302782289279795051331963838153491982859994304,
 44992013321853608507767364268740046524058719860490975738024150882905742142068,
 45347376920371186265056578423508915467555621102356793577860264427609407320002,
 45417822380118456831343979425557987660709928309474456904946981499806740396971,
 45478408061756050208496518724135215946889815335458832442019865162826498078437,
 46094980464553200567008070802184840909322819924896454277033625251648459890753,
 46295949845529146668170374774611529635778316518433103833222053651638153856897,
 46399689838288259600628020133851246400958140826483446503630589452655878595035,
 46711886120057665889623299434728495286625874764116366163309546867374528861763,
 46926565577013103105537460930029566918699334505330104074818487711313324097131,
 47278772767803623640845662508732973685392711040019117300421638029919043565618,
 48353085275969736118048487547913561929051162321892458343999326730917957898450,
 48363523049527155434459282024388309550645884431099550243581203966302339951336,
 49251563797255647434922748070452074911558066792600747686357384487789450970811,
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[gakonst]

Ship it - nice work. @brockelmore said he'd do any follow-up refactors on this.

re: Fixtures, one nice follow-up could be to find the constants in the code and populate the fixtures with it, e.g. how it's done in Echidna by tapping on the output of solc --ast-compact-json https://github.com/crytic/echidna/blob/06cd34b2e8527028e64f0afdd353644976a5b97c/lib/Echidna/Solidity.hs#L154-L185

[gakonst]

We seem to have hit a Shrinking issue?

---- runner::tests::sputnik::test_fuzz_shrinking stdout ----
thread 'runner::tests::sputnik::test_fuzz_shrinking' panicked at 'Integer overflow when casting to u64', /home/runner/.cargo/registry/src/github.com-1ecc6299db9ec823/primitive-types-0.10.1/src/lib.rs:38:1

Maybe this code?
https://github.com/gakonst/foundry/blob/568534d2c44a1f93b59a1a3104fcd2c0bf5f23a9/forge/src/runner.rs#L685-L689

[alexeuler]

We seem to have hit a Shrinking issue?

---- runner::tests::sputnik::test_fuzz_shrinking stdout ----
thread 'runner::tests::sputnik::test_fuzz_shrinking' panicked at 'Integer overflow when casting to u64', /home/runner/.cargo/registry/src/github.com-1ecc6299db9ec823/primitive-types-0.10.1/src/lib.rs:38:1

Maybe this code?

https://github.com/gakonst/foundry/blob/568534d2c44a1f93b59a1a3104fcd2c0bf5f23a9/forge/src/runner.rs#L685-L689

Yeah it's bacause I made dict and edge cases values not shrinkable. I reverted that for this time. Probably it makes sense to try shrink these values since iterations are run pretty fast anyway...

[gakonst]

@alexeuler this is working great inc ombination with the Assume PR!