Improve state decoding tool

[turbolent]

Description

• Handle slab not found errors gracefully (report them)
• Ignore and report empty lines

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• Targeted PR against master branch
• Linked to Github issue with discussion and accepted design OR link to spec that describes this work
• Code follows the standards mentioned here
• Updated relevant documentation
• Re-reviewed Files changed in the Github PR explorer
• Added appropriate labels

[codecov-commenter]

Codecov Report

Merging #1232 (45a7a78) into master (141b10c) will increase coverage by 0.23%.
The diff coverage is n/a.

❗ Current head 45a7a78 differs from pull request most recent head 80d66a9. Consider uploading reports for the commit 80d66a9 to get more accurate results

@@            Coverage Diff             @@
##           master    #1232      +/-   ##
==========================================
+ Coverage   77.17%   77.41%   +0.23%     
==========================================
  Files         279      273       -6     
  Lines       35791    34823     -968     
==========================================
- Hits        27623    26957     -666     
+ Misses       7081     6791     -290     
+ Partials     1087     1075      -12     

Flag	Coverage Δ
unittests	77.41% <ø> (+0.23%)	⬆️

Flags with carried forward coverage won't be shown. Click here to find out more.

Impacted Files	Coverage Δ
runtime/format/string.go	89.28% <0.00%> (-10.72%)	⬇️
runtime/ast/expression.go	74.12% <0.00%> (-8.76%)	⬇️
runtime/common/location.go	71.42% <0.00%> (-2.77%)	⬇️
runtime/ast/block.go	87.50% <0.00%> (-2.50%)	⬇️
runtime/parser2/parser.go	94.58% <0.00%> (-0.99%)	⬇️
runtime/interpreter/errors.go	23.20% <0.00%> (-0.97%)	⬇️
runtime/interpreter/statictype.go	69.86% <0.00%> (-0.72%)	⬇️
runtime/ast/statement.go	77.56% <0.00%> (-0.70%)	⬇️
runtime/convertValues.go	76.60% <0.00%> (-0.66%)	⬇️
runtime/sema/check_for.go	92.72% <0.00%> (-0.61%)	⬇️
... and 50 more

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[github-actions]

Cadence Benchstat comparison

This branch with compared with the base branch onflow:master commit 141b10c
The command for i in {1..N}; do go test ./... -run=XXX -bench=. -shuffle=on; done was used.
Bench tests were run a total of 7 times on each branch.

Results

	old.txt	new.txt
	time/op		delta
ContractInterfaceFungibleToken-2	48.5µs ± 2%	50.4µs ± 5%	+3.89%	(p=0.005 n=6+7)
RuntimeResourceDictionaryValues-2	17.6ms ± 2%	17.8ms ± 4%	~	(p=0.366 n=7+6)
RuntimeFungibleTokenTransfer-2	1.61ms ±18%	1.57ms ±18%	~	(p=0.318 n=7+7)
ParseFungibleToken-2	483µs ± 3%	489µs ± 1%	~	(p=0.432 n=7+5)
ParseInfix-2	25.4µs ± 2%	25.1µs ± 2%	~	(p=0.138 n=7+6)
ParseArray-2	23.8ms ± 6%	23.7ms ± 4%	~	(p=1.000 n=7+7)
ParseDeploy/byte_array-2	35.7ms ± 3%	36.0ms ± 5%	~	(p=0.456 n=7+7)
ParseDeploy/decode_hex-2	1.48ms ± 3%	1.48ms ± 3%	~	(p=0.628 n=7+6)
QualifiedIdentifierCreation/One_level-2	3.33ns ± 3%	3.29ns ± 2%	~	(p=0.301 n=7+7)
QualifiedIdentifierCreation/Three_levels-2	169ns ± 3%	167ns ± 7%	~	(p=0.456 n=7+7)
CheckContractInterfaceFungibleTokenConformance-2	179µs ± 5%	175µs ± 3%	~	(p=0.259 n=7+7)
NewInterpreter/new_interpreter-2	1.21µs ± 4%	1.24µs ± 3%	~	(p=0.137 n=7+7)
NewInterpreter/new_sub-interpreter-2	2.22µs ± 3%	2.27µs ± 6%	~	(p=0.080 n=7+7)
InterpretRecursionFib-2	2.73ms ± 1%	2.81ms ± 5%	~	(p=0.097 n=7+7)
	alloc/op		delta
RuntimeResourceDictionaryValues-2	4.34MB ± 0%	4.34MB ± 0%	~	(p=0.902 n=7+7)
RuntimeFungibleTokenTransfer-2	238kB ± 0%	238kB ± 0%	~	(p=0.659 n=7+6)
QualifiedIdentifierCreation/One_level-2	0.00B	0.00B	~	(all equal)
QualifiedIdentifierCreation/Three_levels-2	64.0B ± 0%	64.0B ± 0%	~	(all equal)
ContractInterfaceFungibleToken-2	26.5kB ± 0%	26.5kB ± 0%	~	(all equal)
CheckContractInterfaceFungibleTokenConformance-2	65.7kB ± 0%	65.7kB ± 0%	~	(all equal)
NewInterpreter/new_interpreter-2	720B ± 0%	720B ± 0%	~	(all equal)
NewInterpreter/new_sub-interpreter-2	1.11kB ± 0%	1.11kB ± 0%	~	(all equal)
InterpretRecursionFib-2	1.24MB ± 0%	1.24MB ± 0%	~	(p=0.140 n=7+6)
	allocs/op		delta
RuntimeResourceDictionaryValues-2	108k ± 0%	108k ± 0%	~	(p=0.970 n=7+7)
RuntimeFungibleTokenTransfer-2	4.53k ± 0%	4.53k ± 0%	~	(p=0.755 n=7+7)
QualifiedIdentifierCreation/One_level-2	0.00	0.00	~	(all equal)
QualifiedIdentifierCreation/Three_levels-2	2.00 ± 0%	2.00 ± 0%	~	(all equal)
ContractInterfaceFungibleToken-2	457 ± 0%	457 ± 0%	~	(all equal)
CheckContractInterfaceFungibleTokenConformance-2	1.07k ± 0%	1.07k ± 0%	~	(all equal)
NewInterpreter/new_interpreter-2	11.0 ± 0%	11.0 ± 0%	~	(all equal)
NewInterpreter/new_sub-interpreter-2	32.0 ± 0%	32.0 ± 0%	~	(all equal)
InterpretRecursionFib-2	25.0k ± 0%	25.0k ± 0%	~	(all equal)

[fxamacker]

I think atree.SlabNotFoundError might not be returned from loadStorageKey.

[turbolent]

loadStorageKey calls StoredValue on the decoded slab, which in turn might read more slabs (e.g. if it is an atree value like an array or dictionary). The decoded state might be corrupt, which might cause atree to load a slab which does not exist, resulting in a SlabNotFoundError