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evaluateInstruction() — react Function Reference

Architecture documentation for the evaluateInstruction() function in ConstantPropagation.ts from the react codebase.

Function typescript BabelCompiler Optimization calls 2 called by 1

Entity Profile

Dependency Diagram

graph TD
  7da3db63_9dcc_8c1f_be1f_66f4e99b59ea["evaluateInstruction()"]
  ee83ff7b_e532_0fd6_0eae_7fe885ffe129["ConstantPropagation.ts"]
  7da3db63_9dcc_8c1f_be1f_66f4e99b59ea -->|defined in| ee83ff7b_e532_0fd6_0eae_7fe885ffe129
  4419ef20_4b5f_b18c_6237_57b76d298666["applyConstantPropagation()"]
  4419ef20_4b5f_b18c_6237_57b76d298666 -->|calls| 7da3db63_9dcc_8c1f_be1f_66f4e99b59ea
  3a755420_8f69_0883_ccd1_2cfb88e3627e["read()"]
  7da3db63_9dcc_8c1f_be1f_66f4e99b59ea -->|calls| 3a755420_8f69_0883_ccd1_2cfb88e3627e
  fbdc3953_3621_331c_a5b1_d3199bea5254["constantPropagationImpl()"]
  7da3db63_9dcc_8c1f_be1f_66f4e99b59ea -->|calls| fbdc3953_3621_331c_a5b1_d3199bea5254
  style 7da3db63_9dcc_8c1f_be1f_66f4e99b59ea fill:#6366f1,stroke:#818cf8,color:#fff

Relationship Graph

Source Code

compiler/packages/babel-plugin-react-compiler/src/Optimization/ConstantPropagation.ts lines 224–615

function evaluateInstruction(
  constants: Constants,
  instr: Instruction,
): Constant | null {
  const value = instr.value;
  switch (value.kind) {
    case 'Primitive': {
      return value;
    }
    case 'LoadGlobal': {
      return value;
    }
    case 'ComputedLoad': {
      const property = read(constants, value.property);
      if (
        property !== null &&
        property.kind === 'Primitive' &&
        ((typeof property.value === 'string' &&
          isValidIdentifier(property.value)) ||
          typeof property.value === 'number')
      ) {
        const nextValue: InstructionValue = {
          kind: 'PropertyLoad',
          loc: value.loc,
          property: makePropertyLiteral(property.value),
          object: value.object,
        };
        instr.value = nextValue;
      }
      return null;
    }
    case 'ComputedStore': {
      const property = read(constants, value.property);
      if (
        property !== null &&
        property.kind === 'Primitive' &&
        ((typeof property.value === 'string' &&
          isValidIdentifier(property.value)) ||
          typeof property.value === 'number')
      ) {
        const nextValue: InstructionValue = {
          kind: 'PropertyStore',
          loc: value.loc,
          property: makePropertyLiteral(property.value),
          object: value.object,
          value: value.value,
        };
        instr.value = nextValue;
      }
      return null;
    }
    case 'PostfixUpdate': {
      const previous = read(constants, value.value);
      if (
        previous !== null &&
        previous.kind === 'Primitive' &&
        typeof previous.value === 'number'
      ) {
        const next =
          value.operation === '++' ? previous.value + 1 : previous.value - 1;
        // Store the updated value
        constants.set(value.lvalue.identifier.id, {
          kind: 'Primitive',
          value: next,
          loc: value.loc,
        });
        // But return the value prior to the update
        return previous;
      }
      return null;
    }
    case 'PrefixUpdate': {
      const previous = read(constants, value.value);
      if (
        previous !== null &&
        previous.kind === 'Primitive' &&
        typeof previous.value === 'number'
      ) {
        const next: Primitive = {
          kind: 'Primitive',
          value:

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Frequently Asked Questions

What does evaluateInstruction() do?
evaluateInstruction() is a function in the react codebase, defined in compiler/packages/babel-plugin-react-compiler/src/Optimization/ConstantPropagation.ts.
Where is evaluateInstruction() defined?
evaluateInstruction() is defined in compiler/packages/babel-plugin-react-compiler/src/Optimization/ConstantPropagation.ts at line 224.
What does evaluateInstruction() call?
evaluateInstruction() calls 2 function(s): constantPropagationImpl, read.
What calls evaluateInstruction()?
evaluateInstruction() is called by 1 function(s): applyConstantPropagation.

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