The-OpenROAD-Project/OpenROAD
Jul 2025 – Nov 2025
5 Months active
Languages Used
C++CMakeDEFMarkdownTclTextVerilogBUILD
Technical Skills
API DevelopmentBug FixingBuild System ConfigurationC++Circuit DesignCode Formatting
Jaehyun Kim
PROFILE
Jaehyun Kim
Jonghwan Kim contributed to The-OpenROAD-Project/OpenROAD by engineering robust hierarchical and flat design flows, focusing on API modernization, code quality, and regression reliability. He developed and refined C++ APIs for netlist extraction and hierarchical connectivity, implemented sanity checks, and expanded test automation using Tcl scripting. Kim addressed complex issues in timing analysis, clock tree synthesis, and database management, ensuring consistent behavior across design hierarchies. His work included optimizing build systems with Bazel and CMake, improving code maintainability through refactoring and linting, and aligning output formats for RC compliance. These efforts enhanced integration speed, reduced release risk, and strengthened long-term maintainability.
Overall Statistics
Feature vs Bugs
57%Features
Repository Contributions
224Total
Bugs
61
Commits
224
Features
82
Lines of code
188,728
Activity Months5
Your Network
84 peopleSame Organization
@precisioninno.com11
Work History
November 2025
7 Commits • 1 Features
Nov 1, 2025November 2025: The OpenROAD project delivered targeted fixes and stability improvements across core synthesis/validation workflows, with a focus on correctness, RC-compliance, and regression infrastructure. The team tightened base-name parsing for hierarchy instance names, aligned SPEF output with RC expectations, expanded CTS regression coverage, and reorganized the regression suite to improve CI reliability and clarity. These changes reduce release risk and strengthen long-term maintainability.
7 Commits • 1 Features
Nov 1, 2025November 2025: The OpenROAD project delivered targeted fixes and stability improvements across core synthesis/validation workflows, with a focus on correctness, RC-compliance, and regression infrastructure. The team tightened base-name parsing for hierarchy instance names, aligned SPEF output with RC expectations, expanded CTS regression coverage, and reorganized the regression suite to improve CI reliability and clarity. These changes reduce release risk and strengthen long-term maintainability.
November 2025
October 2025
62 Commits • 24 Features
Oct 1, 20252025-10 monthly summary for The-OpenROAD-Project/OpenROAD. Key features delivered: - Core API: Added dbModNet::getHierarchicalName() to retrieve the hierarchical name for dbModNet. (commit fc5efff192891e0c6f9ff2fd33cad5d260470ead) - Refactor: Moved and simplified dbNet.findRelatedModNets() into dbNet with a new, simpler implementation. (commits 8c29de770e07ba594254813b596627364ce700e2; 03d2a071c5861064a8d01af4ba033b145c770480) - API Extensions: dbBlock::getBaseName(const char* full_name); dbNet::dump(); dbNet::checkSanityMultipleDrivers(); dbModNet::findRelatedNet(). (commits ae0d415d6113f502112519d667cc76f9ae3f84ce; a152e23776d8bbcbd189c8381334b61c4b1ac90a; 58478822675212562e69b1a5a83dbf74b61f5b64) - Testing: Added a new test case and a new unit test to improve coverage. (commits 7e4f4b3f44e6e026712970829aca015f18d0387d; a8e714a6f21441be4998b9296528d8ed9fcbde8f) - Sanity and cleanup: Enabled sanity checks and migrated checks to dbNet/dbModNet; removed unused dependencies and performed minor refactors. (commits 8b72c4ad7e3f9d8826d346ab9898185bd6e218a6; 7542445c862587febf0e859a5d941bbe84845303; 4107f53fe0b404673f5a6ac315bcc83d83789ffa; 4acf31d4125ef7006cece1877a6199253351b5e6) Major bugs fixed: - Net naming consistency: ensure flat net naming aligns with highest-level hierarchical net name. (commits b6febe7c742943bc21ecf38574d988dc19c4dc87; 1f4964c171b80d4bb6aa5b210c2c12ab6ca23794) - Rebase regressions and failed regressions: rebases and fixes to align with mainline. (commits bb482de9ec96a332e277e4b305156d8434d44c5b; e8e9047fee2ffdf4fb3c02e7ba33ec00a2fe05ad) - Build/format issues: fix builifier format issue. (commit 1662eb3ccda00acf1cabf2991bfb6edf21fad728) - External connectivity: fix bug connecting to an external net. (commit e04628b25690deee76ed5c8adc12ed9bfc226494) - dbModInst: swapMaster() behavior fix to resolve nangate45/mempool_group issue. (commit 1514b3ce79bbbd7e0e0e2f98fd897cb88e534490) - IO type: correct IO type for dbModBTerm bus port. (commit fd258c251635595c0ae698a37131f8b1e9f30085) - Tcl lint: fix Tcl lint issues. (commit 314f63e7c13759037f5767f8522252e55b3a6562) - ODB generator: move include statement to resolve issue. (commit 4c93bd78bc85dac3fd404e332088a2ce6660ae21) - Performance: avoid string comparison with "<top>" to improve correctness. (commit 796d725a9d23e4b595d060351c24795944d50eec) - Lint batch: Fixed lint issues in batch 5. (commits 8dd149b60a4747ce6adb522433b5b0362897e80a; cc542cdcfc275a2baa9c7cab4e17c403743c54b5) Overall impact and accomplishments: - Strengthened core modeling APIs and net sanity, enabling more reliable netlist extraction and debugging workflows. - Expanded test coverage and regression resilience, plus cleanup of dependencies and formatting, resulting in more maintainable code and faster integration cycles. - Improved build stability and static analysis alignment (Bazel/clang-tidy), reducing noise and enabling smoother collaboration across the team. Technologies/skills demonstrated: - C++ API design and refactoring (dbBlock, dbNet, dbModNet, dbModule) - Test-driven development and regression testing - Build systems and tooling: Bazel, clang-tidy, lint hygiene - Code quality initiatives: design constants, const-correctness, metrics, and sanitizers - Netlist integrity checks and validation strategies
October 2025
62 Commits • 24 Features
Oct 1, 20252025-10 monthly summary for The-OpenROAD-Project/OpenROAD. Key features delivered: - Core API: Added dbModNet::getHierarchicalName() to retrieve the hierarchical name for dbModNet. (commit fc5efff192891e0c6f9ff2fd33cad5d260470ead) - Refactor: Moved and simplified dbNet.findRelatedModNets() into dbNet with a new, simpler implementation. (commits 8c29de770e07ba594254813b596627364ce700e2; 03d2a071c5861064a8d01af4ba033b145c770480) - API Extensions: dbBlock::getBaseName(const char* full_name); dbNet::dump(); dbNet::checkSanityMultipleDrivers(); dbModNet::findRelatedNet(). (commits ae0d415d6113f502112519d667cc76f9ae3f84ce; a152e23776d8bbcbd189c8381334b61c4b1ac90a; 58478822675212562e69b1a5a83dbf74b61f5b64) - Testing: Added a new test case and a new unit test to improve coverage. (commits 7e4f4b3f44e6e026712970829aca015f18d0387d; a8e714a6f21441be4998b9296528d8ed9fcbde8f) - Sanity and cleanup: Enabled sanity checks and migrated checks to dbNet/dbModNet; removed unused dependencies and performed minor refactors. (commits 8b72c4ad7e3f9d8826d346ab9898185bd6e218a6; 7542445c862587febf0e859a5d941bbe84845303; 4107f53fe0b404673f5a6ac315bcc83d83789ffa; 4acf31d4125ef7006cece1877a6199253351b5e6) Major bugs fixed: - Net naming consistency: ensure flat net naming aligns with highest-level hierarchical net name. (commits b6febe7c742943bc21ecf38574d988dc19c4dc87; 1f4964c171b80d4bb6aa5b210c2c12ab6ca23794) - Rebase regressions and failed regressions: rebases and fixes to align with mainline. (commits bb482de9ec96a332e277e4b305156d8434d44c5b; e8e9047fee2ffdf4fb3c02e7ba33ec00a2fe05ad) - Build/format issues: fix builifier format issue. (commit 1662eb3ccda00acf1cabf2991bfb6edf21fad728) - External connectivity: fix bug connecting to an external net. (commit e04628b25690deee76ed5c8adc12ed9bfc226494) - dbModInst: swapMaster() behavior fix to resolve nangate45/mempool_group issue. (commit 1514b3ce79bbbd7e0e0e2f98fd897cb88e534490) - IO type: correct IO type for dbModBTerm bus port. (commit fd258c251635595c0ae698a37131f8b1e9f30085) - Tcl lint: fix Tcl lint issues. (commit 314f63e7c13759037f5767f8522252e55b3a6562) - ODB generator: move include statement to resolve issue. (commit 4c93bd78bc85dac3fd404e332088a2ce6660ae21) - Performance: avoid string comparison with "<top>" to improve correctness. (commit 796d725a9d23e4b595d060351c24795944d50eec) - Lint batch: Fixed lint issues in batch 5. (commits 8dd149b60a4747ce6adb522433b5b0362897e80a; cc542cdcfc275a2baa9c7cab4e17c403743c54b5) Overall impact and accomplishments: - Strengthened core modeling APIs and net sanity, enabling more reliable netlist extraction and debugging workflows. - Expanded test coverage and regression resilience, plus cleanup of dependencies and formatting, resulting in more maintainable code and faster integration cycles. - Improved build stability and static analysis alignment (Bazel/clang-tidy), reducing noise and enabling smoother collaboration across the team. Technologies/skills demonstrated: - C++ API design and refactoring (dbBlock, dbNet, dbModNet, dbModule) - Test-driven development and regression testing - Build systems and tooling: Bazel, clang-tidy, lint hygiene - Code quality initiatives: design constants, const-correctness, metrics, and sanitizers - Netlist integrity checks and validation strategies
September 2025
67 Commits • 29 Features
Sep 1, 2025September 2025: Stabilized and advanced the OpenROAD design flow by delivering parity enhancements between flat and hierarchical flows, expanding API surface for tooling, and hardening the codebase with critical bug fixes and test improvements. The team focused on preserving QoR, improving reliability of CTS/verification cycles, and enabling faster debugging and iteration.
67 Commits • 29 Features
Sep 1, 2025September 2025: Stabilized and advanced the OpenROAD design flow by delivering parity enhancements between flat and hierarchical flows, expanding API surface for tooling, and hardening the codebase with critical bug fixes and test improvements. The team focused on preserving QoR, improving reliability of CTS/verification cycles, and enabling faster debugging and iteration.
September 2025
August 2025
65 Commits • 23 Features
Aug 1, 2025August 2025 monthly summary: Delivered significant hierarchical design improvements, robustness enhancements, and API modernization for OpenROAD; fixed critical runtime and integration bugs; expanded regression coverage; and advanced code quality and testing infrastructure to enable scalable design flows and faster validation.
August 2025
65 Commits • 23 Features
Aug 1, 2025August 2025 monthly summary: Delivered significant hierarchical design improvements, robustness enhancements, and API modernization for OpenROAD; fixed critical runtime and integration bugs; expanded regression coverage; and advanced code quality and testing infrastructure to enable scalable design flows and faster validation.
July 2025
23 Commits • 5 Features
Jul 1, 2025July 2025 monthly summary for The-OpenROAD-Project/OpenROAD focusing on delivering robust buffer and scripting capabilities, expanding test coverage, and strengthening build/test reliability. The team delivered key feature work, fixed stability issues, and modernized the codebase with linting and infrastructure improvements that reduce regression risk and accelerate integration of new functionality. Key outcomes include: - Features delivered and stabilized: Buffer Ports enhancements with -buffer_cell support and -verbose option, plus associated tests and documentation corrections; RSZ: adoption of full buffer names with updated tests; and OpenRoad::writeDef API prototype changes with a new overloaded function to simplify usage in debugging scenarios. - Test and quality improvements: Addition of comprehensive rebuffer test cases (rebuffer1.tcl and rebuffer1_hier.tcl), updates to DEF flow usage, integration of make_result_file for new regressions, and read_def changes to -floorplan_initialize; extensive linting, formatting, and test infrastructure upgrades. - Stability and reliability fixes: Tcl lint fixes, test case corrections post-master merge, and ensuring CMakeLists.txt updates are committed to keep the regression suite green. Business value and impact: - Reduced debugging and integration time via easier OpenRoad::writeDef invocation and clearer buffer naming. - Greater test coverage for rebuffer flows and stability under master merges lowers risk for upcoming releases. - Improved maintainability and developer productivity through automated formatting, lint and test infrastructure enhancements. Technologies/skills demonstrated: - Tcl scripting, CMake-based build/config, regression test automation, clang-format-driven linting, and API design for scripting/debugging workflows.
23 Commits • 5 Features
Jul 1, 2025July 2025 monthly summary for The-OpenROAD-Project/OpenROAD focusing on delivering robust buffer and scripting capabilities, expanding test coverage, and strengthening build/test reliability. The team delivered key feature work, fixed stability issues, and modernized the codebase with linting and infrastructure improvements that reduce regression risk and accelerate integration of new functionality. Key outcomes include: - Features delivered and stabilized: Buffer Ports enhancements with -buffer_cell support and -verbose option, plus associated tests and documentation corrections; RSZ: adoption of full buffer names with updated tests; and OpenRoad::writeDef API prototype changes with a new overloaded function to simplify usage in debugging scenarios. - Test and quality improvements: Addition of comprehensive rebuffer test cases (rebuffer1.tcl and rebuffer1_hier.tcl), updates to DEF flow usage, integration of make_result_file for new regressions, and read_def changes to -floorplan_initialize; extensive linting, formatting, and test infrastructure upgrades. - Stability and reliability fixes: Tcl lint fixes, test case corrections post-master merge, and ensuring CMakeLists.txt updates are committed to keep the regression suite green. Business value and impact: - Reduced debugging and integration time via easier OpenRoad::writeDef invocation and clearer buffer naming. - Greater test coverage for rebuffer flows and stability under master merges lowers risk for upcoming releases. - Improved maintainability and developer productivity through automated formatting, lint and test infrastructure enhancements. Technologies/skills demonstrated: - Tcl scripting, CMake-based build/config, regression test automation, clang-format-driven linting, and API design for scripting/debugging workflows.
July 2025
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Quality Metrics
Correctness88.4%
Maintainability88.6%
Architecture84.0%
Performance79.6%
AI Usage20.0%
Skills & Technologies
Programming Languages
BUILDBazelC++CMakeDEFJSONMarkdownPythonSPEFShell
Technical Skills
API DesignAPI DevelopmentAPI RenamingAlgorithm ImplementationBackend DevelopmentBug FixBug FixingBuild SystemBuild System ConfigurationBuild System OptimizationBuild SystemsC++C++ DevelopmentC++ Standard LibraryCAD
Repositories Contributed To
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