25 lines
781 B
TypeScript
25 lines
781 B
TypeScript
// tslint:disable:number-literal-format
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const PUSH1 = 0x60;
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const PUSH32 = 0x7f;
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const isPush = (inst: number) => inst >= PUSH1 && inst <= PUSH32;
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const pushDataLength = (inst: number) => inst - PUSH1 + 1;
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const instructionLength = (inst: number) => (isPush(inst) ? pushDataLength(inst) + 1 : 1);
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export const getPcToInstructionIndexMapping = (bytecode: Uint8Array) => {
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const result: {
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[programCounter: number]: number;
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} = {};
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let byteIndex = 0;
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let instructionIndex = 0;
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while (byteIndex < bytecode.length) {
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const instruction = bytecode[byteIndex];
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const length = instructionLength(instruction);
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result[byteIndex] = instructionIndex;
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byteIndex += length;
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instructionIndex += 1;
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}
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return result;
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};
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