119408 2013-08-01 13:47:58 -0700 Incorrect behavior from non-obvious [[ToPrimitive]] conversions for MakeRope 2013-08-01 15:17:52 -0700 1 1 1 Unclassified WebKit JavaScriptCore 528+ (Nightly build) Unspecified Unspecified RESOLVED FIXED InRadar P2 Normal --- 1 oliver oliver fpizlo oldest_to_newest 913846 0 207948 oliver 2013-08-01 13:47:58 -0700 Created attachment 207948 Testcase We end up with bogus behavior from the DFG when attempting to perform [[ToPrimitive]] on values with exciting defaultValue behavior. function f(a,b,c,d,e) { return "1"+a+b+c+d+e+"6"; } var a=new String("2") var b = 5; var e = false; var k={valueOf:function(){return 4;}, toString:function(){return {}}} s=String var h =""; for (var i = 0; i < 200; i++) h+=f(a,new s(3),k, b, e) h = h.replace(/12345false6/g, "") print("Passed: " + (h.length == 0)); The function f results in: f#BJa4XW:[0x7fee8a5022f0->0x14a7cfe70, BaselineFunctionCall]: 43 m_instructions; 344 bytes; 6 parameter(s); 7 callee register(s); 0 variable(s)[ 0] enter [ 1] mov r0, String (identifier): 1(@k0) [ 4] mov r1, r-8 [ 7] to_primitive r1, r1 rare case: 66 [ 10] mov r2, r-9 [ 13] to_primitive r2, r2 rare case: 66 [ 16] mov r3, r-10 [ 19] to_primitive r3, r3 rare case: 66 [ 22] mov r4, r-11 [ 25] to_primitive r4, r4 [ 28] mov r5, r-12 [ 31] to_primitive r5, r5 [ 34] mov r6, String (identifier): 6(@k1) [ 37] strcat r0, r0, 7 [ 41] ret r0 Constants: k0 = String (identifier): 1 k1 = String (identifier): 6 Which eventually produces: Block #0 (bc#0): (OSR target) Predecessors: Dominated by: #0 Dominates: #0 vars before: arg5:(Top, TOP, TOP, TOP) arg4:(Int) arg3:(Top, TOP, TOP, TOP) arg2:(Cell, TOP, TOP, TOP) arg1:(Cell, TOP, TOP, TOP) arg0:(Top, TOP, TOP, TOP) var links: arg5:@5 arg4:@4 arg3:@3 arg2:@2 arg1:@1 arg0:@0 0: skipped < 0:-> SetArgument(arg0(a), W:SideState, bc#0) 1: < 2:-> SetArgument(, arg1(B<StringObject>), W:SideState, bc#0) predicting Stringobject 2: < 2:-> SetArgument(, arg2(C<StringObject>), W:SideState, bc#0) predicting Stringobject 3: < 2:-> SetArgument(, arg3(D~<Final>), W:SideState, bc#0) predicting Final 4: < 2:-> SetArgument(, arg4(E<Int32>), W:SideState, bc#0) predicting Int 5: < 2:-> SetArgument(, arg5(F~<Boolean>), W:SideState, bc#0) predicting Bool 6: < 2:0> JSConstant(JS|PureNum|UseAsOther, $0 = String (identifier): 1, bc#1) 7: skipped < 0:-> MovHint(@6<StringIdent>, r0(G~<StringIdent>), W:SideState, bc#1) 8: < 1:1> GetLocal(@1, JS|PureNum|UseAsOther, arg1(B<StringObject>), R:Variables(-8), bc#4) predicting Stringobject 9: skipped < 0:-> MovHint(@8<StringObject>, r1(H~<StringObject>), W:SideState, bc#4) 10: <!2:1> ToString(Check:StringObject:@8<StringObject>, JS|MustGen|Clobbers|PureNum|UseAsOther|CanExit, R:JSCell_structure, bc#7) 11: skipped < 0:-> MovHint(@10<String>, r1(I~<String>), W:SideState, bc#7) 12: < 1:2> GetLocal(@2, JS|PureNum|UseAsOther, arg2(C<StringObject>), R:Variables(-9), bc#10) predicting Stringobject 13: skipped < 0:-> MovHint(@12<StringObject>, r2(J~<StringObject>), W:SideState, bc#10) 14: <!2:2> ToString(Check:StringObject:@12<StringObject>, JS|MustGen|Clobbers|PureNum|UseAsOther|CanExit, R:JSCell_structure, bc#13) 15: skipped < 0:-> MovHint(@14<String>, r2(K~<String>), W:SideState, bc#13) 16: < 1:3> GetLocal(@3, JS|PureNum|UseAsOther, arg3(D~<Final>), R:Variables(-10), bc#16) predicting Final 17: skipped < 0:-> MovHint(@16<Final>, r3(L~<Final>), W:SideState, bc#16) 18: <!2:3> ToPrimitive(@16<Final>, JS|MustGen|Clobbers|PureNum|UseAsOther, R:World, W:World, bc#19) 19: skipped < 0:-> MovHint(@18<String>, r3(M~<String>), W:SideState, bc#19) 20: < 2:4> GetLocal(@4, JS|PureNum|UseAsOther, arg4(E<Int32>), R:Variables(-11), bc#22) predicting Int 21: skipped < 0:-> MovHint(@20<Int32>, r4(N~<Int32>), W:SideState, bc#22) 22: <!0:-> Phantom(Int32:@20<Int32>, MustGen, bc#25) 23: skipped < 0:-> MovHint(@20<Int32>, r4(O~<Int32>), W:SideState, bc#25) 24: < 1:5> GetLocal(@5, JS|PureNum|UseAsOther, arg5(F~<Boolean>), R:Variables(-12), bc#28) predicting Bool 25: skipped < 0:-> MovHint(@24<Boolean>, r5(P~<Boolean>), W:SideState, bc#28) 26: <!1:5> ToPrimitive(@24<Boolean>, JS|MustGen|Clobbers|PureNum|UseAsOther, R:World, W:World, bc#31) 27: skipped < 0:-> MovHint(@26<Boolean>, r5(Q~<Boolean>), W:SideState, bc#31) 28: < 2:6> JSConstant(JS|PureNum|UseAsOther, $1 = String (identifier): 6, bc#34) 29: skipped < 0:-> MovHint(@28<StringIdent>, r6(R~<StringIdent>), W:SideState, bc#34) 30: <!0:-> Phantom(String:@6<StringIdent>, MustGen, bc#37) 31: <!0:-> Phantom(String:@10<String>, MustGen, bc#37) 32: <!0:-> Phantom(String:@14<String>, MustGen, bc#37) 33: < 1:2> MakeRope(KnownString:@6<StringIdent>, KnownString:@10<String>, KnownString:@14<String>, JS|UseAsOther, R:GCState, W:GCState, bc#37) 34: <!0:-> Phantom(Check:String:@18<String>, MustGen|CanExit, bc#37) 35: <!1:4> ToString(@20<Int32>, JS|MustGen|MightClobber|UseAsOther, R:World, W:World, bc#37) 36: < 1:4> MakeRope(KnownString:@33<String>, KnownString:@18<String>, KnownString:@35<String>, JS|UseAsOther, R:GCState, W:GCState, bc#37) 37: <!1:5> ToString(@26<Boolean>, JS|MustGen|MightClobber|UseAsOther, R:World, W:World, bc#37) 38: <!0:-> Phantom(String:@28<StringIdent>, MustGen, bc#37) 39: < 1:6> MakeRope(KnownString:@36<String>, KnownString:@37<String>, KnownString:@28<StringIdent>, JS|UseAsOther, R:GCState, W:GCState, bc#37) 40: skipped < 0:-> MovHint(@39<String>, r0(S~<String>), W:SideState, bc#37) 41: <!0:-> Flush(@5, MustGen, arg5(F~<Boolean>), W:SideState, bc#41) predicting Bool 42: <!0:-> Flush(@4, MustGen, arg4(E<Int32>), W:SideState, bc#41) predicting Int 43: <!0:-> Flush(@3, MustGen, arg3(D~<Final>), W:SideState, bc#41) predicting Final 44: <!0:-> Flush(@2, MustGen, arg2(C<StringObject>), W:SideState, bc#41) predicting Stringobject 45: <!0:-> Flush(@1, MustGen, arg1(B<StringObject>), W:SideState, bc#41) predicting Stringobject 46: <!0:-> Return(@39<String>, MustGen, W:SideState, bc#41) vars after: var links: arg5:@24<Boolean> arg4:@20<Int32> arg3:@16<Final> arg2:@12<StringObject> arg1:@8<StringObject> arg0:@0 r0:@40 r1:@11 r2:@15 r3:@19 r4:@23 r5:@27 r6:@29 Where the function f eventually produces: 1undefinedundefined45false6 913848 1 oliver 2013-08-01 13:48:18 -0700 <rdar://problem/14580940> 913882 2 207955 oliver 2013-08-01 14:53:44 -0700 Created attachment 207955 Patch 913884 3 oliver 2013-08-01 14:57:15 -0700 Actually <rdar://14625273> 913902 4 oliver 2013-08-01 15:17:52 -0700 Committed r153615: <http://trac.webkit.org/changeset/153615> 207948 2013-08-01 13:47:58 -0700 2013-08-01 13:47:58 -0700 Testcase test.js text/plain 318 oliver ZnVuY3Rpb24gZihhLGIsYyxkLGUpIHsgcmV0dXJuICIxIithK2IrYytkK2UrIjYiOyB9CnZhciBh PW5ldyBTdHJpbmcoIjIiKQp2YXIgYiA9IDU7CnZhciBlID0gZmFsc2U7CnZhciBrPXt2YWx1ZU9m OmZ1bmN0aW9uKCl7cmV0dXJuIDQ7fSwgdG9TdHJpbmc6ZnVuY3Rpb24oKXtyZXR1cm4ge319fQpz PVN0cmluZwoKdmFyIGggPSIiOyBmb3IgKHZhciBpID0gMDsgaSA8IDIwMDsgaSsrKSBoKz1mKGEs 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