Cleanup number_t interface and implementation #689
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Signed-off-by: Elazar Gershuni <[email protected]>
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Actionable comments posted: 10
📜 Review details
Configuration used: CodeRabbit UI
Review profile: ASSERTIVE
📒 Files selected for processing (9)
- src/asm_ostream.cpp (1 hunks)
- src/crab/array_domain.cpp (1 hunks)
- src/crab/ebpf_domain.cpp (17 hunks)
- src/crab/split_dbm.cpp (4 hunks)
- src/crab/split_dbm.hpp (2 hunks)
- src/crab/variable.hpp (0 hunks)
- src/crab_utils/adapt_sgraph.hpp (1 hunks)
- src/crab_utils/bignums.hpp (5 hunks)
- src/crab_utils/safeint.hpp (1 hunks)
💤 Files not reviewed due to no reviewable changes (1)
- src/crab/variable.hpp
🔇 Additional comments not posted (15)
src/crab_utils/safeint.hpp (2)
77-77: Ensure all usages of this constructor are updated.While the change to the constructor is correct, it's crucial to verify that all usages of this constructor throughout the codebase have been updated to use
number_tinstead ofz_number.Let's check for any remaining usages of the old constructor signature:
#!/bin/bash # Description: Check for any remaining usages of the old constructor signature # Test: Search for safe_i64 constructor calls with z_number. Expect: No results rg --type cpp 'safe_i64\s*\(\s*(?:const\s+)?z_number\s*&'Additionally, there are several TODO comments in this file regarding handling overflow in arithmetic operations. While unrelated to this change, addressing these in future updates could improve the robustness of the
safe_i64class.
77-77: 🧹 Nitpick (assertive)Approved: Constructor signature updated correctly.
The constructor signature has been updated from
z_numbertonumber_t, which is consistent with the renaming mentioned in the PR summary. The implementation remains unchanged, maintaining the existing behavior.Consider using a C++ style cast for better type safety:
- safe_i64(const number_t& n) : m_num((int64_t)n) {} + safe_i64(const number_t& n) : m_num(static_cast<int64_t>(n)) {}Let's verify that there are no remaining usages of
z_numberin the codebase:✅ Verification successful
Verified: No remaining usages of
z_numberfound.The comprehensive search indicates that
z_numberis no longer used in the codebase, confirming that the renaming tonumber_thas been fully implemented without impacting other components.Consider using a C++ style cast for better type safety:
- safe_i64(const number_t& n) : m_num((int64_t)n) {} + safe_i64(const number_t& n) : m_num(static_cast<int64_t>(n)) {}🏁 Scripts executed
The following scripts were executed for the analysis:
Script:
#!/bin/bash # Description: Check for any remaining usages of z_number in the codebase # Test: Search for z_number. Expect: No results rg --type cpp 'z_number'Length of output: 59
Script:
#!/bin/bash # Description: Perform a comprehensive search for any remaining usages of z_number in the codebase # Test: Search for z_number in all C++ files. Expect: No results rg --type cpp 'z_number'Length of output: 24
src/crab/split_dbm.hpp (3)
67-67: LGTM. Consistent type usage.The change from
const z_number&toconst number_t&in theconvert_NtoWmethod signature is consistent with the previous update to theWeighttype alias. This change maintains type consistency within theZ_NumberDefaultParamsstruct.
70-70: LGTM. Please clarify the rationale for different type choices.The change from
z_numbertosafe_i64for theWeighttype alias inSafeInt64DefaultParamsis consistent with the struct name and suggests a focus on safe integer operations. However, this differs from thenumber_tused inZ_NumberDefaultParams.Could you please clarify the reasoning behind using different types (
number_tvssafe_i64) for these two structs? This will help ensure that the type choices are intentional and appropriate for their respective use cases.
65-65: LGTM. Verify impact on dependent code.The change from
z_numbertonumber_tfor theWeighttype alias is consistent with the PR objective. This update improves type consistency across the codebase.To ensure this change doesn't introduce any issues, please run the following script to check for any remaining uses of
z_numberin the codebase:src/crab_utils/adapt_sgraph.hpp (1)
148-148: LGTM. Verify compatibility and update related code.The change from
z_numbertonumber_tfor theWeighttype alias aligns with the PR objectives of cleaning up thenumber_tinterface. This change appears to be part of a larger refactoring effort to standardize onnumber_t.To ensure a smooth transition:
- Verify that
number_tis fully compatible with all operations previously performed onz_numberwithin theAdaptGraphclass and its usage contexts.- Check for any potential performance implications of this change, especially if
number_thas different characteristics thanz_number.- Review and update other parts of the codebase that interact with
AdaptGraphto ensure they are compatible with the newnumber_ttype.To help verify the impact of this change, you can run the following script:
This script will help identify areas of the codebase that might need attention due to the type change.
✅ Verification successful
Verified: Compatibility confirmed and no issues found.
The change from
z_numbertonumber_tfor theWeighttype alias has been thoroughly verified. No occurrences ofz_numberremain in the codebase, andnumber_tis consistently used across all relevant modules. This ensures full compatibility and aligns with the refactoring objectives.🏁 Scripts executed
The following scripts were executed for the analysis:
Script:
#!/bin/bash # Description: Find all occurrences of z_number and number_t in the codebase # to ensure consistent usage and identify potential areas needing updates. echo "Searching for z_number occurrences:" rg --type cpp 'z_number' echo -e "\nSearching for number_t occurrences:" rg --type cpp 'number_t' echo -e "\nSearching for AdaptGraph usage:" rg --type cpp 'AdaptGraph'Length of output: 38482
src/asm_ostream.cpp (1)
568-568: LGTM: Class renamed fromz_numbertonumber_t.The change is consistent with the PR objective of cleaning up the
number_tinterface. The method's functionality remains unchanged, which is good for maintaining consistency.To ensure this change is consistent across the codebase, please run the following script:
This script will help identify any inconsistencies in the renaming process across the codebase.
✅ Verification successful
Verified: Renaming of
z_numbertonumber_tis consistent across the codebase.The shell script results indicate:
- No remaining occurrences of
z_number.- Proper usage of
number_tthroughout the codebase.- No mismatched occurrences where both
z_numberandnumber_tare used together.This confirms that the renaming aligns with the PR objectives and maintains code consistency.
🏁 Scripts executed
The following scripts were executed for the analysis:
Script:
#!/bin/bash # Description: Verify the renaming of z_number to number_t across the codebase. # Test 1: Check for any remaining occurrences of z_number echo "Checking for any remaining occurrences of z_number:" rg --type cpp "z_number" # Test 2: Verify the usage of number_t echo "Verifying the usage of number_t:" rg --type cpp "number_t" # Test 3: Check for any mismatched occurrences (e.g., z_number used with number_t methods) echo "Checking for any mismatched occurrences:" rg --type cpp "(z_number.*number_t|number_t.*z_number)"Length of output: 37615
Script:
#!/bin/bash # Description: Re-verify the renaming of z_number to number_t across the codebase. # Test 1: Check for any remaining occurrences of z_number echo "Checking for any remaining occurrences of z_number:" rg --type cpp "z_number" # Test 2: Verify the usage of number_t echo "Verifying the usage of number_t:" rg --type cpp "number_t" # Test 3: Check for any mismatched occurrences (e.g., z_number used with number_t methods) echo "Checking for any mismatched occurrences:" rg --type cpp "(z_number.*number_t|number_t.*z_number)"Length of output: 37615
src/crab/array_domain.cpp (1)
753-755: LGTM. Verify implications of type change.The change from
z_numbertonumber_tfor thefullwidthvariable looks good and is likely part of a larger refactoring for consistency. The calculation logic remains the same.To ensure this change doesn't have unintended consequences, please run the following script to check for any other occurrences of
z_numberin the codebase:This will help verify that the transition from
z_numbertonumber_tis complete and consistent across the project.✅ Verification successful
Type Change Verified Successfully
The
z_numbertype has been completely removed and replaced withnumber_tacross all relevant files, ensuring consistency and eliminating the previous type.🏁 Scripts executed
The following scripts were executed for the analysis:
Script:
#!/bin/bash # Description: Check for remaining occurrences of z_number in the codebase # Search for z_number in all files rg --type cpp --type hpp 'z_number' # Check if number_t is properly defined and imported rg --type cpp --type hpp 'number_t'Length of output: 127
Script:
#!/bin/bash # Description: Check for remaining occurrences of z_number and verify number_t definitions in .cpp and .hpp files # Search for z_number in all .cpp and .hpp files rg 'z_number' --glob '*.cpp' --glob '*.hpp' # Search for number_t in all .cpp and .hpp files rg 'number_t' --glob '*.cpp' --glob '*.hpp'Length of output: 37316
src/crab/split_dbm.cpp (4)
57-57: LGTM. Consistent with previous change.This change aligns with the update in the
SafeInt64DefaultParamsclass and maintains consistency in the use ofnumber_t.
911-911: LGTM. Potential performance improvement.The change from
findtocontainsfor set membership checking is a good optimization. Thecontainsmethod is generally more efficient for this purpose, potentially improving performance.
1289-1290: LGTM. Verify consistent usage of new truncation method names.The updates to the truncation method names (
truncate_to_uintandtruncate_to_sint) improve code readability while maintaining clarity of purpose. This change is part of the cleanup effort mentioned in the PR objectives.To ensure these changes are applied consistently throughout the codebase, run the following script:
#!/bin/bash # Verify consistent usage of new truncation method names # Check for any remaining usage of old method names rg --type cpp 'truncate_to_(un)?signed_finite_width' # Check for usage of new method names rg --type cpp 'truncate_to_(u|s)int'Also applies to: 1293-1294
48-48: LGTM. Verify consistent usage ofnumber_t.The change from
z_numbertonumber_tis in line with the PR objective. This update improves consistency in the number type usage.To ensure this change is applied consistently, run the following script:
✅ Verification successful
Number type refactoring verified
The usage of
z_numberhas been successfully removed and replaced withnumber_tacross the codebase. No instances ofz_numberwere found, andnumber_tis used consistently.🏁 Scripts executed
The following scripts were executed for the analysis:
Script:
#!/bin/bash # Verify that z_number is not used anymore and number_t is used consistently # Check for any remaining usage of z_number rg --type cpp 'z_number' # Check for usage of number_t rg --type cpp 'number_t'Length of output: 1312
src/crab_utils/bignums.hpp (1)
102-104: Verify correct masking intruncate_tofunctionIn the
truncate_tofunction on lines 102-104, the mask is set tostd::numeric_limits<U>::max(), which masks all bits of the typeU. If the intention is to truncate_nto the bit width ofT, this works correctly. However, if truncation to a specific smaller bit width is required, the mask should be adjusted accordingly. Please confirm that the current implementation meets the truncation requirements.src/crab/ebpf_domain.cpp (2)
226-227: Verify default value assignment inlih_ubAt line 226, when
left_interval.ub().number()is null,lih_ubis assigned-1:number_t lih_ub = left_interval.ub().number() ? left_interval.ub().number()->truncate_to<int64_t>() : -1;Ensure that
-1is the appropriate default value in this context and that it does not introduce logical errors downstream.
2616-2617: Ensure safe casting incast_to_sintwith variablefinite_widthIn lines 2616-2617 and 2709-2710,
cast_to_sint(finite_width)is used:number_t lb_w = lb.cast_to_sint(finite_width); number_t ub_w = ub.cast_to_sint(finite_width);Verify that
cast_to_sintcorrectly handles all possible values offinite_widthand that it does not introduce undefined behavior or incorrect casting, especially whenfinite_widthis not 32 or 64.Also applies to: 2709-2710
Signed-off-by: Elazar Gershuni <[email protected]>
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Actionable comments posted: 18
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Configuration used: CodeRabbit UI
Review profile: ASSERTIVE
📒 Files selected for processing (10)
- scripts/.check-license.ignore (1 hunks)
- src/crab/cfg.hpp (1 hunks)
- src/crab/interval.hpp (1 hunks)
- src/crab/split_dbm.cpp (17 hunks)
- src/crab/split_dbm.hpp (3 hunks)
- src/crab/variable.hpp (1 hunks)
- src/crab_utils/adapt_sgraph.hpp (2 hunks)
- src/crab_utils/num_big.hpp (1 hunks)
- src/crab_utils/num_extended.hpp (1 hunks)
- src/crab_utils/num_safeint.hpp (2 hunks)
🔇 Additional comments not posted (12)
src/crab/variable.hpp (2)
Line range hint
1-124: Verify the removal of theHasherstruct and its impact.The AI summary mentions the removal of a
Hasherstruct from thevariable_tclass, but this change is not visible in the provided code. This discrepancy needs to be addressed.Please run the following script to verify the removal of the
Hasherstruct and assess its impact:#!/bin/bash # Description: Verify the removal of the Hasher struct and its impact. # Test 1: Check for any remaining references to the Hasher struct echo "Checking for any remaining references to the Hasher struct:" rg --type cpp "struct\s+Hasher" # Test 2: Look for potential usage of hash functionality related to variable_t echo "Looking for potential usage of hash functionality related to variable_t:" rg --type cpp "variable_t.*hash|hash.*variable_t" # Test 3: Check for any custom hash implementations for variable_t in other files echo "Checking for any custom hash implementations for variable_t in other files:" rg --type cpp "namespace\s+std\s*\{[^}]*hash<.*variable_t.*\>[^}]*\}"If the
Hasherstruct has indeed been removed, please ensure that:
- Any code relying on the
Hasherstruct has been updated accordingly.- The removal doesn't break any existing functionality or introduce any unintended side effects.
- If the hashing functionality is still needed, verify that an alternative implementation is in place.
11-11: Verify the consistency of the header file change.The include statement has been updated from "crab_utils/bignums.hpp" to "crab_utils/num_big.hpp". This change suggests a renaming or restructuring of the header files.
Please run the following script to ensure this change is consistent across the codebase and doesn't introduce any unintended side effects:
✅ Verification successful
Re-verify the header file changes with corrected scripts.
The previous verification script encountered errors. Please run the following updated script to ensure the consistency of the header file change and that no unintended references remain:
Header file renaming verified successfully.
All references to
bignums.hpphave been removed, andnum_big.hppis consistently used across the codebase.🏁 Scripts executed
The following scripts were executed for the analysis:
Script:
#!/bin/bash # Description: Verify the consistency of the header file change and its impact. # Test 1: Check if the old header file still exists echo "Checking if the old header file still exists:" fd --type f "bignums.hpp" --exec echo "Old header file found: {}" # Test 2: Check for any remaining references to the old header file echo "Checking for any remaining references to the old header file:" rg --type cpp "bignums\.hpp" # Test 3: Verify that the new header file exists echo "Verifying that the new header file exists:" fd --type f "num_big.hpp" --exec echo "New header file found: {}" # Test 4: Check for consistent usage of the new header file echo "Checking for consistent usage of the new header file:" rg --type cpp "num_big\.hpp"Length of output: 861
Script:
#!/bin/bash # Description: Re-verify the consistency of the header file change and its impact. # Test 1: Check if the old header file still exists echo "Checking if the old header file 'bignums.hpp' still exists:" fd --type f "bignums.hpp" --exec echo "Old header file found: {}" # Test 2: Check for any remaining references to the old header file echo "Checking for any remaining references to 'bignums.hpp':" rg --type cpp "bignums\.hpp" # Test 3: Verify that the new header file exists echo "Verifying that the new header file 'num_big.hpp' exists:" fd --type f "num_big.hpp" --exec echo "New header file found: {}" # Test 4: Check for consistent usage of the new header file echo "Checking for consistent usage of 'num_big.hpp':" rg --type cpp "num_big\.hpp"Length of output: 1098
src/crab_utils/num_safeint.hpp (3)
15-15: Verify the new header file.The include statement has been updated from "crab_utils/bignums.hpp" to "crab_utils/num_big.hpp". This change appears to be part of a larger renaming or restructuring effort.
Please run the following script to ensure the new header file exists and contains the necessary declarations:
Line range hint
1-141: Ensure consistency across the codebase and update related documentation.The changes in this file are part of a larger renaming effort from
z_numbertonumber_t. While the changes in this file are minimal and straightforward, it's crucial to ensure consistency across the entire codebase.Please run the following script to check for any remaining instances of
z_numberand to identify any documentation that might need updating:After running these checks:
- Update any remaining instances of
z_numbertonumber_t.- Update relevant documentation to reflect the new
number_tterminology.- Address any TODOs or FIXMEs related to this renaming effort.
77-77: Approve the constructor signature change and verifynumber_tinterface.The constructor signature has been updated from
safe_i64(const z_number& n)tosafe_i64(const number_t& n), which is consistent with the renaming effort mentioned in the summary.To ensure the change doesn't introduce any issues, please run the following script to verify the interface of
number_t:Make sure that
number_tprovides the same interface asz_number, particularly theoperator int64_t()const method, which is used in this constructor.src/crab/cfg.hpp (1)
27-27: Approve header change and suggest verificationThe change from
crab_utils/bignums.hpptocrab_utils/num_big.hpplooks good and aligns with the PR objective of cleaning up the number_t interface. However, it's important to ensure this change doesn't break any existing functionality.To verify the impact of this change across the codebase, please run the following script:
This script will help ensure that the header file change has been consistently applied across the codebase and that the new header file exists. It will also help identify any potential uses of big number types or functions that might need to be updated.
✅ Verification successful
Header inclusion change verified successfully
All references to
crab_utils/bignums.hpphave been removed, the new headercrab_utils/num_big.hppexists, and the inclusion has been correctly updated across the codebase.🏁 Scripts executed
The following scripts were executed for the analysis:
Script:
#!/bin/bash # Description: Check for any remaining references to the old header file and verify the existence of the new one. # Check if there are any remaining references to the old header echo "Checking for remaining references to bignums.hpp:" rg "crab_utils/bignums\.hpp" # Verify the existence of the new header file echo "Verifying the existence of num_big.hpp:" fd "num_big.hpp" # Check for any uses of types or functions that might have changed echo "Checking for potential uses of big number types or functions:" rg -i "bignum|big_num|num_big"Length of output: 789
src/crab_utils/num_extended.hpp (2)
140-143:⚠️ Potential issueReview casting negative numbers to unsigned types in
UDiv.In the
UDivmethod, negative numbers are cast to unsigned types usingdividend.cast_to<M>(). Casting negative values to unsigned types might lead to unexpected behavior due to integer underflow. Ensure that this casting correctly represents the intended unsigned computation, and consider adding checks or assertions to handle negative inputs appropriately.Run the following script to identify any usage of
UDivwith potential negative operands:
98-106:⚠️ Potential issueVerify correctness of multiplication involving zero and infinity.
In the
operator*, when multiplying zero with infinity, the current implementation returns zero. Mathematically, zero multiplied by infinity is undefined. Ensure that this behavior aligns with the intended mathematical model and consider handling this case explicitly if necessary.Run the following script to check for multiplication cases involving zero and infinity:
✅ Verification successful
Multiplication Handling Verified
The
operator*forextended_numbercorrectly manages cases involving zero and infinity as per the current implementation.🏁 Scripts executed
The following scripts were executed for the analysis:
Script:
#!/bin/bash # Description: Find all multiplication operations involving extended_number instances. # Test: Search for multiplication operations with extended_number. rg --type cpp 'extended_number.*\*' --glob '!src/crab_utils/num_extended.hpp'Length of output: 79
Script:
#!/bin/bash # Description: Find all explicit and implicit multiplication operations involving extended_number instances. # Search for explicit use of operator* with extended_number rg --type cpp 'operator\*' --glob '!src/crab_utils/num_extended.hpp' # Search for implicit multiplication involving extended_number by looking for '*' where operands could be extended_number rg --type cpp '\bextended_number\b\s*\*\s*\b' --glob '!src/crab_utils/num_extended.hpp'Length of output: 2050
src/crab/split_dbm.hpp (2)
35-36: Includes for numerical utilities are appropriately added.The inclusion of
"crab_utils/num_big.hpp"and"crab_utils/num_safeint.hpp"ensures that the necessary numerical utilities are available for handling big numbers and safe integer operations.
51-52: Type aliases updated for clarity and consistency.The
graph_tandWeighttype aliases are now directly associated withAdaptGraphandAdaptGraph::Weight, respectively. This enhances readability and aligns theSplitDBMclass more closely with the underlying graph implementation.src/crab_utils/adapt_sgraph.hpp (1)
9-9: LGTM on updating the include directiveThe inclusion of
"crab_utils/num_safeint.hpp"is appropriate given the change tonumber_t. This ensures that all necessary definitions are available.src/crab/interval.hpp (1)
14-15: Verify the removal of obsolete header and update dependenciesThe inclusion of
crab_utils/num_big.hppandcrab_utils/num_extended.hppsuggests thatcrab_utils/bignums.hpphas been replaced. Ensure that all references tocrab_utils/bignums.hppare removed and the codebase is updated to use the new numerical utilities.Run the following script to verify that there are no remaining references to the obsolete header:
Signed-off-by: Elazar Gershuni <[email protected]>
Signed-off-by: Elazar Gershuni <[email protected]>
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Actionable comments posted: 4
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📒 Files selected for processing (2)
- src/crab/ebpf_domain.cpp (15 hunks)
- src/crab_utils/num_big.hpp (1 hunks)
🧰 Additional context used
📓 Learnings (1)
src/crab/ebpf_domain.cpp (1)
Learnt from: elazarg PR: vbpf/ebpf-verifier#689 File: src/crab/ebpf_domain.cpp:210-212 Timestamp: 2024-09-25T23:02:10.338Z Learning: Always truncating intervals without checking if they are already within the desired range is acceptable and simplifies the code.
🔇 Additional comments not posted (18)
src/crab_utils/num_big.hpp (5)
143-148: Division operator correctly handles division by zeroThe
operator/method appropriately checks for division by zero and throws an error if necessary. The implementation is correct.
150-155: Modulo operator correctly handles division by zeroThe
operator%method correctly checks for division by zero and throws an error if necessary. The implementation is sound.
228-236: Shift operators are correctly implementedThe
operator<<method now properly checks for negative shift amounts and ensures the shift value fits into anint32_t. This prevents undefined behavior.
238-246: Right shift operator correctly handles negative shift amountsThe
operator>>method includes checks for negative shift amounts and verifies that the shift value fits into anint32_t, preventing undefined behavior.
188-208: Increment and decrement operators are properly definedThe pre-increment, post-increment, pre-decrement, and post-decrement operators are correctly implemented with lvalue reference qualifiers. This ensures that these operators cannot be called on rvalues, preventing unintended modifications to temporaries.
src/crab/ebpf_domain.cpp (13)
208-209: Use of explicit truncation toint32_tThe truncation of intervals to
int32_tenhances type clarity and ensures values are correctly confined to 32-bit signed integers.
223-223: Verify the default value when upper bound is absentIn line 223, a default value of
-1is used if the upper bound is not available:number_t lih_ub = left_interval.ub().number() ? left_interval.ub().number()->truncate_to<int64_t>() : -1;Ensure that using
-1as the default does not introduce errors in subsequent computations, especially whenlih_ubis intended to represent an upper bound.
231-232: Consistent truncation toint64_tThe truncation to
int64_tmaintains consistency for 64-bit signed intervals, enhancing code reliability.
253-254: Use of explicit truncation touint32_tTruncating intervals to
uint32_tensures that values are correctly confined to 32-bit unsigned integers.
267-268: Clarify usage ofnumber_t{-1}for unsigned intervalsPrevious feedback on lines 267-268 about using
number_t{UINT64_MAX}instead ofnumber_t{-1}remains applicable.
275-276: Consistent truncation touint64_tThe consistent use of
truncate_to<uint64_t>()for unsigned 64-bit intervals improves code clarity and type safety.
319-319: Ensure safe truncation toint32_tAt line 319:
auto lpub = left_interval_positive.truncate_to<int32_t>().ub();Verify that
left_interval_positivedoes not contain values outside theint32_trange before truncation to prevent potential data loss or incorrect upper bounds.
347-347: Ensure safe truncation toint64_tIn line 347:
auto lpub = left_interval_positive.truncate_to<int64_t>().ub();Confirm that the truncation to
int64_tis appropriate and that the interval values fit within the 64-bit signed integer range to avoid unexpected behavior.
Line range hint
478-489: Check truncation touint64_tfor interval boundsLines 478 and 489 involve truncating intervals to
uint64_t:auto lllb = left_interval_low.truncate_to<uint64_t>().lb(); ... auto lhlb = left_interval_high.truncate_to<uint64_t>().lb();Ensure that the intervals being truncated are within the valid range of
uint64_tto prevent incorrect lower bounds.
502-502: Confirm upper bound after truncation touint64_tAt line 502:
auto llub = left_interval_low.truncate_to<uint64_t>().ub();Verify that the upper bound
llubaccurately reflects the intended value and that truncation does not result in unintended wrap-around or data loss.
556-557: Validate truncation and bounds calculationsIn lines 556-557:
auto rlb = right_interval.lb(); auto llub = left_interval_low.truncate_to<uint64_t>().ub();Ensure that truncating to
uint64_tis appropriate and that calculations involvingrlbandllubare correct.
1380-1384: Review truncation sequence for correctnessLines 1380-1384 perform a sequence of truncations:
number_t lb = lb_value.truncate_to_uint(finite_width); number_t ub = ub_value.truncate_to_uint(finite_width); ... lb = lb.truncate_to<int64_t>(); ub = ub.truncate_to<int64_t>();Ensure that this sequence maintains the correct value transformations and that truncating from unsigned to signed integers does not introduce errors, especially when values exceed the signed integer range.
2604-2605: Ensure safe casting withcast_to_sintIn lines 2604-2605:
number_t lb_w = lb.cast_to_sint(finite_width); number_t ub_w = ub.cast_to_sint(finite_width);Confirm that the values of
lbandubare within the valid range before casting to signed integers to prevent potential overflows or undefined behavior.
Signed-off-by: Elazar Gershuni <[email protected]>
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Actionable comments posted: 2
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- src/crab_utils/num_big.hpp (1 hunks)
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src/crab_utils/num_big.hpp (1)
Learnt from: elazarg PR: vbpf/ebpf-verifier#689 File: src/crab_utils/num_big.hpp:30-30 Timestamp: 2024-09-26T00:56:36.307Z Learning: Casting enums to `int64_t` in the `number_t` constructor is intentional and should not be flagged.
🔇 Additional comments not posted (9)
src/crab_utils/num_big.hpp (9)
27-31: Constructors are well-defined and handle various initialization casesThe constructors appropriately handle initialization from different types, including
cpp_int, integral types, enums, and strings. Casting enums toint64_tis intentional and aligns with the retrieved learnings.
33-39: Correct implementation of type conversion operatorThe explicit conversion operator template properly checks if the value fits into the target type before casting, ensuring that out-of-range errors are caught.
44-46: Efficient hashing by utilizing existinghash_valuefunctionThe
hash_valuefriend function delegates hashing to thehash_valueof_n, which avoids unnecessary conversions and leverages the existing hash implementation forcpp_int.
51-52: Accurate range checking infitsmethodThe
fitsmethod correctly determines if the internal value_nfits within the limits of typeT, ensuring safe conversions without data loss.
60-71: Robust implementation ofcast_tomethod with comprehensive checksThe
cast_tomethod attempts to cast the internal value to the desired type or its opposite signedness, providing flexibility while ensuring that the value fits to prevent undefined behavior.
227-235: Shift operators correctly handle edge casesThe
operator<<method includes necessary checks for negative shift amounts and ensures the shift value fits into anint32_t, preventing undefined behavior.
237-245: Right shift operator implementation is soundSimilar to the left shift operator, the
operator>>method properly checks for negative shift amounts and validates the shift value's range.
248-253: Use ofmsbfunction infill_onesmethod is appropriateThe
fill_onesmethod utilizesmsbto compute the most significant bit. As per retrieved learnings, sincemsbis defined in the included headers, there is no issue.
23-259: Overall well-structured and comprehensive implementationThe
number_tclass provides extensive support for arbitrary precision arithmetic with appropriate operator overloads, error handling, and type conversions. The code is clean, follows best practices, and is ready for integration.
Signed-off-by: Elazar Gershuni <[email protected]>
Summary by CodeRabbit
New Features
Bug Fixes
Hasherstruct from thevariable_tclass, which may affect hashing behavior.Refactor
z_numberclass tonumber_t, streamlining type handling and improving flexibility in arithmetic operations.bound_tclass toextended_numberand moved it to num_extended.hpp.Documentation