perf(ngcc): use binary search when flattening mappings (#36027)
The `@angular/core` package has a large number of source files and mappings which exposed performance issues in the new source-map flattening algorithm. This change uses a binary search (rather than linear) when finding matching mappings to merge. Initial measurements indicate that this reduces processing time for `@angular/core` by about 50%. PR Close #36027
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Pete Bacon Darwin
committed by
Andrew Kushnir
Andrew Kushnir
parent
c852ec9283
commit
348ff0c8ea
@ -10,15 +10,14 @@ import {encode} from 'sourcemap-codec';
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import {absoluteFrom} from '../../../src/ngtsc/file_system';
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import {runInEachFileSystem} from '../../../src/ngtsc/file_system/testing';
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import {RawSourceMap} from '../../src/sourcemaps/raw_source_map';
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import {SourceFile, computeLineLengths, extractOriginalSegments, parseMappings} from '../../src/sourcemaps/source_file';
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import {SegmentMarker} from '../../src/sourcemaps/segment_marker';
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import {Mapping, SourceFile, computeLineLengths, extractOriginalSegments, findLastMappingIndexBefore, parseMappings} from '../../src/sourcemaps/source_file';
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runInEachFileSystem(() => {
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describe('SourceFile and utilities', () => {
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let _: typeof absoluteFrom;
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beforeEach(() => {
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_ = absoluteFrom;
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});
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beforeEach(() => { _ = absoluteFrom; });
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describe('parseMappings()', () => {
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it('should be an empty array for source files with no source map', () => {
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@ -84,6 +83,205 @@ runInEachFileSystem(() => {
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});
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});
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describe('findLastMappingIndexBefore', () => {
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it('should find the highest mapping index that has a segment marker below the given one if there is not an exact match',
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() => {
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const marker5: SegmentMarker = {line: 0, column: 50};
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const marker4: SegmentMarker = {line: 0, column: 40};
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const marker3: SegmentMarker = {line: 0, column: 30};
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const marker2: SegmentMarker = {line: 0, column: 20};
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const marker1: SegmentMarker = {line: 0, column: 10};
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const mappings: Mapping[] = [marker1, marker2, marker3, marker4, marker5].map(
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marker => ({ generatedSegment: marker } as Mapping));
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const marker: SegmentMarker = {line: 0, column: 35};
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const index = findLastMappingIndexBefore(mappings, marker, /* exclusive */ false, 0);
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expect(index).toEqual(2);
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});
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it('should find the highest mapping index that has a segment marker (when there are duplicates) below the given one if there is not an exact match',
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() => {
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const marker5: SegmentMarker = {line: 0, column: 50};
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const marker4: SegmentMarker = {line: 0, column: 30};
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const marker3: SegmentMarker = {line: 0, column: 30};
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const marker2: SegmentMarker = {line: 0, column: 20};
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const marker1: SegmentMarker = {line: 0, column: 10};
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const mappings: Mapping[] = [marker1, marker2, marker3, marker4, marker5].map(
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marker => ({ generatedSegment: marker } as Mapping));
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const marker: SegmentMarker = {line: 0, column: 35};
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const index = findLastMappingIndexBefore(mappings, marker, /* exclusive */ false, 0);
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expect(index).toEqual(3);
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});
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it('should find the last mapping if the segment marker is higher than all of them', () => {
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const marker5: SegmentMarker = {line: 0, column: 50};
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const marker4: SegmentMarker = {line: 0, column: 40};
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const marker3: SegmentMarker = {line: 0, column: 30};
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const marker2: SegmentMarker = {line: 0, column: 20};
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const marker1: SegmentMarker = {line: 0, column: 10};
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const mappings: Mapping[] = [marker1, marker2, marker3, marker4, marker5].map(
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marker => ({ generatedSegment: marker } as Mapping));
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const marker: SegmentMarker = {line: 0, column: 60};
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const index = findLastMappingIndexBefore(mappings, marker, /* exclusive */ false, 0);
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expect(index).toEqual(4);
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});
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it('should return -1 if the segment marker is lower than all of them', () => {
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const marker5: SegmentMarker = {line: 0, column: 50};
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const marker4: SegmentMarker = {line: 0, column: 40};
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const marker3: SegmentMarker = {line: 0, column: 30};
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const marker2: SegmentMarker = {line: 0, column: 20};
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const marker1: SegmentMarker = {line: 0, column: 10};
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const mappings: Mapping[] = [marker1, marker2, marker3, marker4, marker5].map(
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marker => ({ generatedSegment: marker } as Mapping));
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const marker: SegmentMarker = {line: 0, column: 5};
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const index = findLastMappingIndexBefore(mappings, marker, /* exclusive */ false, 0);
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expect(index).toEqual(-1);
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});
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describe('[exact match inclusive]', () => {
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it('should find the matching segment marker mapping index if there is only one of them',
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() => {
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const marker5: SegmentMarker = {line: 0, column: 50};
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const marker4: SegmentMarker = {line: 0, column: 40};
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const marker3: SegmentMarker = {line: 0, column: 30};
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const marker2: SegmentMarker = {line: 0, column: 20};
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const marker1: SegmentMarker = {line: 0, column: 10};
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const mappings: Mapping[] = [marker1, marker2, marker3, marker4, marker5].map(
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marker => ({ generatedSegment: marker } as Mapping));
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const index = findLastMappingIndexBefore(mappings, marker3, /* exclusive */ false, 0);
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expect(index).toEqual(2);
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});
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it('should find the highest matching segment marker mapping index if there is more than one of them',
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() => {
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const marker5: SegmentMarker = {line: 0, column: 50};
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const marker4: SegmentMarker = {line: 0, column: 30};
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const marker3: SegmentMarker = {line: 0, column: 30};
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const marker2: SegmentMarker = {line: 0, column: 20};
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const marker1: SegmentMarker = {line: 0, column: 10};
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const mappings: Mapping[] = [marker1, marker2, marker3, marker4, marker5].map(
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marker => ({ generatedSegment: marker } as Mapping));
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const index = findLastMappingIndexBefore(mappings, marker3, /* exclusive */ false, 0);
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expect(index).toEqual(3);
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});
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});
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describe('[exact match exclusive]', () => {
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it('should find the preceding mapping index if there is a matching segment marker', () => {
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const marker5: SegmentMarker = {line: 0, column: 50};
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const marker4: SegmentMarker = {line: 0, column: 40};
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const marker3: SegmentMarker = {line: 0, column: 30};
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const marker2: SegmentMarker = {line: 0, column: 20};
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const marker1: SegmentMarker = {line: 0, column: 10};
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const mappings: Mapping[] = [marker1, marker2, marker3, marker4, marker5].map(
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marker => ({ generatedSegment: marker } as Mapping));
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const index = findLastMappingIndexBefore(mappings, marker3, /* exclusive */ true, 0);
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expect(index).toEqual(1);
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});
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it('should find the highest preceding mapping index if there is more than one matching segment marker',
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() => {
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const marker5: SegmentMarker = {line: 0, column: 50};
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const marker4: SegmentMarker = {line: 0, column: 30};
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const marker3: SegmentMarker = {line: 0, column: 30};
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const marker2: SegmentMarker = {line: 0, column: 20};
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const marker1: SegmentMarker = {line: 0, column: 10};
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const mappings: Mapping[] = [marker1, marker2, marker3, marker4, marker5].map(
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marker => ({ generatedSegment: marker } as Mapping));
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const index = findLastMappingIndexBefore(mappings, marker3, /* exclusive */ false, 0);
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expect(index).toEqual(3);
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});
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});
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describe('[with lowerIndex hint', () => {
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it('should find the highest mapping index above the lowerIndex hint that has a segment marker below the given one if there is not an exact match',
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() => {
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const marker5: SegmentMarker = {line: 0, column: 50};
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const marker4: SegmentMarker = {line: 0, column: 40};
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const marker3: SegmentMarker = {line: 0, column: 30};
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const marker2: SegmentMarker = {line: 0, column: 20};
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const marker1: SegmentMarker = {line: 0, column: 10};
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const mappings: Mapping[] = [marker1, marker2, marker3, marker4, marker5].map(
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marker => ({ generatedSegment: marker } as Mapping));
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const marker: SegmentMarker = {line: 0, column: 35};
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const index = findLastMappingIndexBefore(mappings, marker, /* exclusive */ false, 1);
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expect(index).toEqual(2);
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});
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it('should return the lowerIndex mapping index if there is a single exact match and we are not exclusive',
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() => {
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const marker5: SegmentMarker = {line: 0, column: 50};
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const marker4: SegmentMarker = {line: 0, column: 40};
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const marker3: SegmentMarker = {line: 0, column: 30};
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const marker2: SegmentMarker = {line: 0, column: 20};
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const marker1: SegmentMarker = {line: 0, column: 10};
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const mappings: Mapping[] = [marker1, marker2, marker3, marker4, marker5].map(
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marker => ({ generatedSegment: marker } as Mapping));
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const marker: SegmentMarker = {line: 0, column: 30};
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const index = findLastMappingIndexBefore(mappings, marker, /* exclusive */ false, 2);
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expect(index).toEqual(2);
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});
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it('should return the lowerIndex mapping index if there are multiple exact matches and we are not exclusive',
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() => {
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const marker5: SegmentMarker = {line: 0, column: 50};
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const marker4: SegmentMarker = {line: 0, column: 30};
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const marker3: SegmentMarker = {line: 0, column: 30};
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const marker2: SegmentMarker = {line: 0, column: 20};
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const marker1: SegmentMarker = {line: 0, column: 10};
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const mappings: Mapping[] = [marker1, marker2, marker3, marker4, marker5].map(
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marker => ({ generatedSegment: marker } as Mapping));
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const marker: SegmentMarker = {line: 0, column: 30};
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const index = findLastMappingIndexBefore(mappings, marker, /* exclusive */ false, 3);
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expect(index).toEqual(3);
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});
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it('should return -1 if the segment marker is lower than the lowerIndex hint', () => {
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const marker5: SegmentMarker = {line: 0, column: 50};
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const marker4: SegmentMarker = {line: 0, column: 40};
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const marker3: SegmentMarker = {line: 0, column: 30};
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const marker2: SegmentMarker = {line: 0, column: 20};
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const marker1: SegmentMarker = {line: 0, column: 10};
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const mappings: Mapping[] = [marker1, marker2, marker3, marker4, marker5].map(
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marker => ({ generatedSegment: marker } as Mapping));
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const marker: SegmentMarker = {line: 0, column: 25};
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const index = findLastMappingIndexBefore(mappings, marker, /* exclusive */ false, 2);
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expect(index).toEqual(-1);
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});
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it('should return -1 if the segment marker is equal to the lowerIndex hint and we are exclusive',
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() => {
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const marker5: SegmentMarker = {line: 0, column: 50};
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const marker4: SegmentMarker = {line: 0, column: 40};
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const marker3: SegmentMarker = {line: 0, column: 30};
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const marker2: SegmentMarker = {line: 0, column: 20};
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const marker1: SegmentMarker = {line: 0, column: 10};
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const mappings: Mapping[] = [marker1, marker2, marker3, marker4, marker5].map(
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marker => ({ generatedSegment: marker } as Mapping));
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const marker: SegmentMarker = {line: 0, column: 30};
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const index = findLastMappingIndexBefore(mappings, marker, /* exclusive */ true, 2);
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expect(index).toEqual(-1);
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});
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});
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});
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describe('SourceFile', () => {
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describe('flattenedMappings', () => {
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it('should be an empty array for source files with no source map', () => {
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