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[wasm] Fix long branches in jiterpreter #106030

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merged 4 commits into from
Aug 7, 2024
+27 −8
Merged

[wasm] Fix long branches in jiterpreter #106030

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85e05aa
Can't build locally, so let's see if this works. Who knows
kg Aug 6, 2024
7b5b0c7
Fix long branches with immediates
kg Aug 6, 2024
6e23591
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kg Aug 6, 2024
f80726d
Fix handling of unsigned branch immediates
kg Aug 7, 2024
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1 change: 0 additions & 1 deletion src/mono/browser/runtime/jiterpreter-opcodes.ts
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Original file line number Diff line number Diff line change
Expand Up @@ -36,7 +36,6 @@ export const enum MintOpArgType {
MintOpFloat,
MintOpDouble,
MintOpBranch,
MintOpShortBranch,
MintOpSwitch,
MintOpMethodToken,
MintOpFieldToken,
Expand Down
34 changes: 27 additions & 7 deletions src/mono/browser/runtime/jiterpreter-trace-generator.ts
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Original file line number Diff line number Diff line change
Expand Up @@ -2752,6 +2752,21 @@ function append_call_handler_store_ret_ip (
builder.callHandlerReturnAddresses.push(retIp);
}

function getBranchImmediate (
ip: MintOpcodePtr, opcode: MintOpcode
): number | undefined {
const opArgType = cwraps.mono_jiterp_get_opcode_info(opcode, OpcodeInfoType.OpArgType),
payloadOffset = cwraps.mono_jiterp_get_opcode_info(opcode, OpcodeInfoType.Sregs),
payloadAddress = <any>ip + 2 + (payloadOffset * 2);

switch (opArgType) {
case MintOpArgType.MintOpShortAndBranch:
return getI16(payloadAddress);
default:
return undefined;
}
}

function getBranchDisplacement (
ip: MintOpcodePtr, opcode: MintOpcode
): number | undefined {
Expand Down Expand Up @@ -2785,8 +2800,10 @@ function emit_branch (
(opcode <= MintOpcode.MINT_BLT_UN_I8_IMM_SP);

const displacement = getBranchDisplacement(ip, opcode);
if (typeof (displacement) !== "number")
if (typeof (displacement) !== "number") {
// mono_log_info(`Failed to decode branch displacement for ${getOpcodeName(opcode)}`);
return false;
}

// If the branch is taken we bail out to allow the interpreter to do it.
// So for brtrue, we want to do 'cond == 0' to produce a bailout only
Expand Down Expand Up @@ -2874,9 +2891,6 @@ function emit_branch (
if (relopbranchTable[opcode] === undefined)
throw new Error(`Unsupported relop branch opcode: ${getOpcodeName(opcode)}`);

if (cwraps.mono_jiterp_get_opcode_info(opcode, OpcodeInfoType.Length) !== 4)
throw new Error(`Unsupported long branch opcode: ${getOpcodeName(opcode)}`);

break;
}
}
Expand Down Expand Up @@ -2920,8 +2934,10 @@ function emit_relop_branch (
frame: NativePointer, opcode: MintOpcode
): boolean {
const relopBranchInfo = relopbranchTable[opcode];
if (!relopBranchInfo)
if (!relopBranchInfo) {
// mono_log_info(`No info for relop branch ${getOpcodeName(opcode)}`);
return false;
}

const relop = Array.isArray(relopBranchInfo)
? relopBranchInfo[0]
Expand All @@ -2930,8 +2946,10 @@ function emit_relop_branch (
const relopInfo = binopTable[relop];
const intrinsicFpBinop = intrinsicFpBinops[relop];

if (!relopInfo && !intrinsicFpBinop)
if (!relopInfo && !intrinsicFpBinop) {
// mono_log_info(`No info for relop ${getOpcodeName(opcode)} -> ${getOpcodeName(relop)}`);
return false;
}

const operandLoadOp = relopInfo
? relopInfo[1]
Expand All @@ -2948,11 +2966,13 @@ function emit_relop_branch (

// Compare with immediate
if (Array.isArray(relopBranchInfo) && relopBranchInfo[1]) {
const immediate = getBranchImmediate(ip, opcode);
mono_assert(immediate !== undefined, `Failed to decode immediate for branch opcode ${getOpcodeName(opcode)}`);
// For i8 immediates we need to generate an i64.const even though
// the immediate is 16 bits, so we store the relevant opcode
// in the relop branch info table
builder.appendU8(relopBranchInfo[1]);
builder.appendLeb(getArgI16(ip, 2));
builder.appendLeb(immediate);
} else
append_ldloc(builder, getArgU16(ip, 2), operandLoadOp);

Expand Down
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