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import * as frontend from 'llparse-frontend';
import {
ARG_STATE, ARG_POS, ARG_ENDPOS,
STATE_ERROR,
VAR_MATCH,
CONTAINER_KEY,
} from './constants';
import { Compilation } from './compilation';
import code from './code';
import node from './node';
import { Node } from './node';
import transform from './transform';
export interface ICCompilerOptions {
readonly debug?: string;
readonly header?: string;
}
export interface ICPublicOptions {
readonly header?: string;
}
export class CCompiler {
constructor(container: frontend.Container,
public readonly options: ICCompilerOptions) {
container.add(CONTAINER_KEY, { code, node, transform });
}
public compile(info: frontend.IFrontendResult): string {
const compilation = new Compilation(info.prefix, info.properties,
info.resumptionTargets, this.options);
const out: string[] = [];
out.push('#include <stdlib.h>');
out.push('#include <stdint.h>');
out.push('#include <string.h>');
out.push('');
// NOTE: Inspired by https://github.com/h2o/picohttpparser
// TODO(indutny): Windows support for SSE4.2.
// See: https://github.com/nodejs/llparse/pull/24#discussion_r299789676
// (There is no `__SSE4_2__` define for MSVC)
out.push('#ifdef __SSE4_2__');
out.push(' #ifdef _MSC_VER');
out.push(' #include <nmmintrin.h>');
out.push(' #else /* !_MSC_VER */');
out.push(' #include <x86intrin.h>');
out.push(' #endif /* _MSC_VER */');
out.push('#endif /* __SSE4_2__ */');
out.push('');
out.push('#ifdef _MSC_VER');
out.push(' #define ALIGN(n) _declspec(align(n))');
out.push('#else /* !_MSC_VER */');
out.push(' #define ALIGN(n) __attribute__((aligned(n)))');
out.push('#endif /* _MSC_VER */');
out.push('');
out.push(`#include "${this.options.header || info.prefix}.h"`);
out.push(``);
out.push(`typedef int (*${info.prefix}__span_cb)(`);
out.push(` ${info.prefix}_t*, const char*, const char*);`);
out.push('');
// Queue span callbacks to be built before `executeSpans()` code gets called
// below.
compilation.reserveSpans(info.spans);
const root = info.root as frontend.ContainerWrap<frontend.node.Node>;
const rootState = root.get<Node<frontend.node.Node>>(CONTAINER_KEY)
.build(compilation);
compilation.buildGlobals(out);
out.push('');
out.push(`int ${info.prefix}_init(${info.prefix}_t* ${ARG_STATE}) {`);
out.push(` memset(${ARG_STATE}, 0, sizeof(*${ARG_STATE}));`);
out.push(` ${ARG_STATE}->_current = (void*) (intptr_t) ${rootState};`);
out.push(' return 0;');
out.push('}');
out.push('');
out.push(`static llparse_state_t ${info.prefix}__run(`);
out.push(` ${info.prefix}_t* ${ARG_STATE},`);
out.push(` const unsigned char* ${ARG_POS},`);
out.push(` const unsigned char* ${ARG_ENDPOS}) {`);
out.push(` int ${VAR_MATCH};`);
out.push(` switch ((llparse_state_t) (intptr_t) ` +
`${compilation.currentField()}) {`);
let tmp: string[] = [];
compilation.buildResumptionStates(tmp);
compilation.indent(out, tmp, ' ');
out.push(' default:');
out.push(' /* UNREACHABLE */');
out.push(' abort();');
out.push(' }');
tmp = [];
compilation.buildInternalStates(tmp);
compilation.indent(out, tmp, ' ');
out.push('}');
out.push('');
out.push(`int ${info.prefix}_execute(${info.prefix}_t* ${ARG_STATE}, ` +
`const char* ${ARG_POS}, const char* ${ARG_ENDPOS}) {`);
out.push(' llparse_state_t next;');
out.push('');
out.push(' /* check lingering errors */');
out.push(` if (${compilation.errorField()} != 0) {`);
out.push(` return ${compilation.errorField()};`);
out.push(' }');
out.push('');
tmp = [];
this.restartSpans(compilation, info, tmp);
compilation.indent(out, tmp, ' ');
const args = [
compilation.stateArg(),
`(const unsigned char*) ${compilation.posArg()}`,
`(const unsigned char*) ${compilation.endPosArg()}`,
];
out.push(` next = ${info.prefix}__run(${args.join(', ')});`);
out.push(` if (next == ${STATE_ERROR}) {`);
out.push(` return ${compilation.errorField()};`);
out.push(' }');
out.push(` ${compilation.currentField()} = (void*) (intptr_t) next;`);
out.push('');
tmp = [];
this.executeSpans(compilation, info, tmp);
compilation.indent(out, tmp, ' ');
out.push(' return 0;');
out.push('}');
return out.join('\n');
}
private restartSpans(ctx: Compilation, info: frontend.IFrontendResult,
out: string[]): void {
if (info.spans.length === 0) {
return;
}
out.push('/* restart spans */');
for (const span of info.spans) {
const posField = ctx.spanPosField(span.index);
out.push(`if (${posField} != NULL) {`);
out.push(` ${posField} = (void*) ${ctx.posArg()};`);
out.push('}');
}
out.push('');
}
private executeSpans(ctx: Compilation, info: frontend.IFrontendResult,
out: string[]): void {
if (info.spans.length === 0) {
return;
}
out.push('/* execute spans */');
for (const span of info.spans) {
const posField = ctx.spanPosField(span.index);
let callback: string;
if (span.callbacks.length === 1) {
callback = ctx.buildCode(ctx.unwrapCode(span.callbacks[0]));
} else {
callback = `(${info.prefix}__span_cb) ` + ctx.spanCbField(span.index);
callback = `(${callback})`;
}
const args = [
ctx.stateArg(), posField, `(const char*) ${ctx.endPosArg()}`,
];
out.push(`if (${posField} != NULL) {`);
out.push(' int error;');
out.push('');
out.push(` error = ${callback}(${args.join(', ')});`);
// TODO(indutny): de-duplicate this here and in SpanEnd
out.push(' if (error != 0) {');
out.push(` ${ctx.errorField()} = error;`);
out.push(` ${ctx.errorPosField()} = ${ctx.endPosArg()};`);
out.push(' return error;');
out.push(' }');
out.push('}');
}
out.push('');
}
}
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