Assertion `context->m_registerStack->size() == before' failed in Escargot::ExpressionStatementNode::generateStatementByteCode

[EJueon]

Escargot

• OS: Ubuntu 20.04.5 LTS (Linux 5.4.0-144-generic x86_64)
• Revision : bd95de3c46e515a387ae1c3d0b214d9ddbd99e90

Build Steps

cmake -DESCARGOT_MODE=debug -DESCARGOT_OUTPUT=shell -GNinja

Describe the bug Assertion failure

Test case

testcase

a = [ ] ; 
a = [ 0.1, 0.1, 0.1 ] ; 
a. length = 1 ; 
delete a [ 1 ] ; 
a = delete a ; 
delete a ; 
a [ 0 ] ;

// poc.js
a = delete a ;

Execution steps & Output

$ ./escargot/escargot poc.js
escargot: src/parser/ast/ExpressionStatementNode.h:55: virtual void Escargot::ExpressionStatementNode::generateStatementByteCode(Escargot::ByteCodeBlock*, Escargot::ByteCodeGenerateContext*): Assertion `context->m_registerStack->size() == before' failed.
Aborted

Backtrace

(gdb) bt
#0  __GI_raise (sig=sig@entry=6) at ../sysdeps/unix/sysv/linux/raise.c:50
#1  0x00007ffff7a70859 in __GI_abort () at abort.c:79
#2  0x00007ffff7a70729 in __assert_fail_base (fmt=0x7ffff7c06588 "%s%s%s:%u: %s%sAssertion `%s' failed.\n%n",
    assertion=0x555555b1d830 "context->m_registerStack->size() == before", file=0x555555b1d800 "src/parser/ast/ExpressionStatementNode.h", line=55, function=<optimized out>)
    at assert.c:92
#3  0x00007ffff7a81fd6 in __GI___assert_fail (assertion=0x555555b1d830 "context->m_registerStack->size() == before",
    file=0x555555b1d800 "src/parser/ast/ExpressionStatementNode.h", line=55,
    function=0x555555b1d778 "virtual void Escargot::ExpressionStatementNode::generateStatementByteCode(Escargot::ByteCodeBlock*, Escargot::ByteCodeGenerateContext*)")
    at assert.c:101
#4  0x000055555580520b in Escargot::ExpressionStatementNode::generateStatementByteCode (this=0x555555d12b20, codeBlock=0xc1f50, context=0x7fffffffdb20)
    at src/parser/ast/ExpressionStatementNode.h:55
#5  0x00005555557edef8 in Escargot::StatementContainer::generateStatementByteCode (this=0x555555d12ab0, codeBlock=0xc1f50, context=0x7fffffffdb20)
    at src/parser/ast/StatementNode.h:107
#6  0x000055555580e65d in Escargot::ProgramNode::generateStatementByteCode (this=0x555555d12b40, codeBlock=0xc1f50, context=0x7fffffffdb20) at src/parser/ast/ProgramNode.h:48
#7  0x000055555570525c in Escargot::ByteCodeGenerator::generateByteCode (context=0xa3af0, codeBlock=0xbde30, ast=0x555555d12b40, inWithFromRuntime=false, cacheByteCode=false)
    at src/interpreter/ByteCodeGenerator.cpp:272
#8  0x00005555557e5f8c in Escargot::ScriptParser::initializeScript (this=0x59f70, originSource=0x0, originLineOffset=0, source=0xabf70, srcName=0x7a390, parentCodeBlock=0x0,
    isModule=false, isEvalMode=false, isEvalCodeInFunction=false, inWithOperation=false, strictFromOutside=false, allowSuperCall=false, allowSuperProperty=false,
    allowNewTarget=false, needByteCodeGeneration=true) at src/parser/ScriptParser.cpp:455
#9  0x000055555563bec4 in Escargot::ScriptParser::initializeScript (this=0x59f70, source=0xabf70, srcName=0x7a390, isModule=false) at src/parser/ScriptParser.h:57
#10 0x000055555564333d in Escargot::ScriptParserRef::initializeScript (this=0x59f70, source=0xabf70, srcName=0x7a390, isModule=false) at src/api/EscargotPublic.cpp:4626
#11 0x00005555559a3d07 in evalScript (context=0xa3af0, source=0xabf70, srcName=0x7a390, shouldPrintScriptResult=false, isModule=false) at src/shell/Shell.cpp:751
#12 0x00005555559a52bd in main (argc=2, argv=0x7fffffffe348) at src/shell/Shell.cpp:1130
(gdb)

Expected behavior

true

Credits: @Ye0nny, @EJueon