1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
|
declare module "bun:jsc" {
export function describe(value: any): string;
export function describeArray(args: any[]): string;
export function gcAndSweep(): void;
export function fullGC(): void;
export function edenGC(): void;
export function heapSize(): number;
export function heapStats(): {
heapSize: number;
heapCapacity: number;
extraMemorySize: number;
objectCount: number;
protectedObjectCount: number;
globalObjectCount: number;
protectedGlobalObjectCount: number;
objectTypeCounts: Record<string, number>;
protectedObjectTypeCounts: Record<string, number>;
};
export function memoryUsage(): {
current: number;
peak: number;
currentCommit: number;
peakCommit: number;
pageFaults: number;
};
export function getRandomSeed(): number;
export function setRandomSeed(value: number): void;
export function isRope(input: string): boolean;
export function callerSourceOrigin(): string;
export function noFTL(func: Function): Function;
export function noOSRExitFuzzing(func: Function): Function;
export function optimizeNextInvocation(func: Function): Function;
export function numberOfDFGCompiles(func: Function): number;
export function releaseWeakRefs(): void;
export function totalCompileTime(func: Function): number;
export function reoptimizationRetryCount(func: Function): number;
export function drainMicrotasks(): void;
/**
* Run JavaScriptCore's sampling profiler for a particular function
*
* This is pretty low-level.
*
* Things to know:
* - LLint means "Low Level Interpreter", which is the interpreter that runs before any JIT compilation
* - Baseline is the first JIT compilation tier. It's the least optimized, but the fastest to compile
* - DFG means "Data Flow Graph", which is the second JIT compilation tier. It has some optimizations, but is slower to compile
* - FTL means "Faster Than Light", which is the third JIT compilation tier. It has the most optimizations, but is the slowest to compile
*/
export function profile(
callback: CallableFunction,
sampleInterval?: number,
): {
/**
* A formatted summary of the top functions
*
* Example output:
* ```js
*
* Sampling rate: 100.000000 microseconds. Total samples: 6858
* Top functions as <numSamples 'functionName#hash:sourceID'>
* 2948 '#<nil>:8'
* 393 'visit#<nil>:8'
* 263 'push#<nil>:8'
* 164 'scan_ref_scoped#<nil>:8'
* 164 'walk#<nil>:8'
* 144 'pop#<nil>:8'
* 107 'extract_candidates#<nil>:8'
* 94 'get#<nil>:8'
* 82 'Function#<nil>:4294967295'
* 79 'set#<nil>:8'
* 67 'forEach#<nil>:5'
* 58 'collapse#<nil>:8'
* ```
*/
functions: string;
/**
* A formatted summary of the top bytecodes
*
* Example output:
* ```js
* Tier breakdown:
* -----------------------------------
* LLInt: 106 (1.545640%)
* Baseline: 2355 (34.339458%)
* DFG: 3290 (47.973170%)
* FTL: 833 (12.146398%)
* js builtin: 132 (1.924759%)
* Wasm: 0 (0.000000%)
* Host: 111 (1.618548%)
* RegExp: 15 (0.218723%)
* C/C++: 0 (0.000000%)
* Unknown Executable: 148 (2.158064%)
*
*
* Hottest bytecodes as <numSamples 'functionName#hash:JITType:bytecodeIndex'>
* 273 'visit#<nil>:DFG:bc#63'
* 121 'walk#<nil>:DFG:bc#7'
* 119 '#<nil>:Baseline:bc#1'
* 82 'Function#<nil>:None:<nil>'
* 66 '#<nil>:DFG:bc#11'
* 65 '#<nil>:DFG:bc#33'
* 58 '#<nil>:Baseline:bc#7'
* 53 '#<nil>:Baseline:bc#23'
* 50 'forEach#<nil>:DFG:bc#83'
* 49 'pop#<nil>:FTL:bc#65'
* 47 '#<nil>:DFG:bc#99'
* 45 '#<nil>:DFG:bc#16'
* 44 '#<nil>:DFG:bc#7'
* 44 '#<nil>:Baseline:bc#30'
* 44 'push#<nil>:FTL:bc#214'
* 41 '#<nil>:DFG:bc#50'
* 39 'get#<nil>:DFG:bc#27'
* 39 '#<nil>:Baseline:bc#0'
* 36 '#<nil>:DFG:bc#27'
* 36 'Dictionary#<nil>:DFG:bc#41'
* 36 'visit#<nil>:DFG:bc#81'
* 36 'get#<nil>:FTL:bc#11'
* 32 'push#<nil>:FTL:bc#49'
* 31 '#<nil>:DFG:bc#76'
* 31 '#<nil>:DFG:bc#10'
* 31 '#<nil>:DFG:bc#73'
* 29 'set#<nil>:DFG:bc#28'
* 28 'in_boolean_context#<nil>:DFG:bc#104'
* 28 '#<nil>:Baseline:<nil>'
* 28 'regExpSplitFast#<nil>:None:<nil>'
* 26 'visit#<nil>:DFG:bc#95'
* 26 'pop#<nil>:FTL:bc#120'
* 25 '#<nil>:DFG:bc#23'
* 25 'push#<nil>:FTL:bc#152'
* 24 'push#<nil>:FTL:bc#262'
* 24 '#<nil>:FTL:bc#10'
* 23 'is_identifier_char#<nil>:DFG:bc#22'
* 23 'visit#<nil>:DFG:bc#22'
* 22 '#<nil>:FTL:bc#27'
* 22 'indexOf#<nil>:None:<nil>'
* ```
*/
bytecodes: string;
/**
* Stack traces of the top functions
*/
stackTraces: string[];
};
/**
* This returns objects which native code has explicitly protected from being
* garbage collected
*
* By calling this function you create another reference to the object, which
* will further prevent it from being garbage collected
*
* This function is mostly a debugging tool for bun itself.
*
* Warning: not all objects returned are supposed to be observable from JavaScript
*/
export function getProtectedObjects(): any[];
/**
* Start a remote debugging socket server on the given port.
*
* This exposes JavaScriptCore's built-in debugging server.
*
* This is untested. May not be supported yet on macOS
*/
export function startRemoteDebugger(host?: string, port?: number): void;
/**
* Run JavaScriptCore's sampling profiler
*/
export function startSamplingProfiler(optionalDirectory?: string): void;
}
|
