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Call trampolines with the actual number of provided operands

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When calling indirectly, the number of required operands might not be known at compile time and providing the actual number of operands instead solves this.
This commit is contained in:
dcodeIO
2018-03-23 15:00:09 +01:00
parent 4adb69f73a
commit 2738eee9cd
13 changed files with 150 additions and 76 deletions
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18
src/compiler.ts
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@ -4274,6 +4274,13 @@ export class Compiler extends DiagnosticEmitter {
/** Gets the trampoline for the specified function. */
ensureTrampoline(original: Function): Function {
// A trampoline is a function that takes a fixed amount of operands with some of them possibly
// being zeroed. It takes one additional argument denoting the number of actual operands
// provided to the call, and takes appropriate steps to initialize zeroed operands to their
// default values using the optional parameter initializers of the original function. Doing so
// allows calls to functions with optional parameters to circumvent the trampoline when all
// parameters are provided as a fast route, respectively setting up omitted operands in a proper
// context otherwise.
var trampoline = original.trampoline;
if (trampoline) return trampoline;
@ -4345,7 +4352,14 @@ export class Compiler extends DiagnosticEmitter {
var body = module.createBlock(names[0], [
module.createBlock("N=invalid", [
module.createSwitch(names, "N=invalid",
module.createGetLocal(maxOperands, NativeType.I32)
// condition is number of provided optional operands, so subtract required operands
minOperands
? module.createBinary(
BinaryOp.SubI32,
module.createGetLocal(maxOperands, NativeType.I32),
module.createI32(minOperands)
)
: module.createGetLocal(maxOperands, NativeType.I32)
)
]),
module.createUnreachable()
@ -4407,7 +4421,7 @@ export class Compiler extends DiagnosticEmitter {
for (let i = numArguments; i < maxArguments; ++i) {
operands.push(instance.signature.parameterTypes[i].toNativeZero(module));
}
operands.push(module.createI32(numOperands - minOperands));
operands.push(module.createI32(numOperands)); // actual number of provided operands
}
var returnType = instance.signature.returnType;
this.currentType = returnType;