go/src/pkg/runtime/race.c

// Copyright 2011 The Go Authors. All rights reserved.
// Use of this source code is governed by a BSD-style
// license that can be found in the LICENSE file.

// Implementation of the race detector API.
// +build race

#include "runtime.h"
#include "arch_GOARCH.h"
#include "malloc.h"
#include "race.h"

void runtime∕race·Initialize(void);
void runtime∕race·Finalize(void);
void runtime∕race·FinalizerGoroutine(int32);
void runtime∕race·Read(int32 goid, void *addr, void *pc);
void runtime∕race·Write(int32 goid, void *addr, void *pc);
void runtime∕race·FuncEnter(int32 goid, void *pc);
void runtime∕race·FuncExit(int32 goid);
void runtime∕race·Malloc(int32 goid, void *p, uintptr sz, void *pc);
void runtime∕race·Free(void *p);
void runtime∕race·GoStart(int32 pgoid, int32 chgoid, void *pc);
void runtime∕race·GoEnd(int32 goid);
void runtime∕race·Acquire(int32 goid, void *addr);
void runtime∕race·Release(int32 goid, void *addr);
void runtime∕race·ReleaseMerge(int32 goid, void *addr);

extern byte noptrdata[];
extern byte enoptrbss[];

static bool onstack(uintptr argp);

void
runtime·raceinit(void)
{
	m->racecall = true;
	runtime∕race·Initialize();
	m->racecall = false;
}

void
runtime·racefini(void)
{
	m->racecall = true;
	runtime∕race·Finalize();
	m->racecall = false;
}

// Called from instrumented code.
// If we split stack, getcallerpc() can return runtime·lessstack().
#pragma textflag 7
void
runtime·racewrite(uintptr addr)
{
	if(!onstack(addr)) {
		m->racecall = true;
		runtime∕race·Write(g->goid-1, (void*)addr, runtime·getcallerpc(&addr));
		m->racecall = false;
	}
}

// Called from instrumented code.
// If we split stack, getcallerpc() can return runtime·lessstack().
#pragma textflag 7
void
runtime·raceread(uintptr addr)
{
	if(!onstack(addr)) {
		m->racecall = true;
		runtime∕race·Read(g->goid-1, (void*)addr, runtime·getcallerpc(&addr));
		m->racecall = false;
	}
}

// Called from instrumented code.
#pragma textflag 7
void
runtime·racefuncenter(uintptr pc)
{
	// If the caller PC is lessstack, use slower runtime·callers
	// to walk across the stack split to find the real caller.
	if(pc == (uintptr)runtime·lessstack)
		runtime·callers(2, &pc, 1);

	m->racecall = true;
	runtime∕race·FuncEnter(g->goid-1, (void*)pc);
	m->racecall = false;
}

// Called from instrumented code.
#pragma textflag 7
void
runtime·racefuncexit(void)
{
	m->racecall = true;
	runtime∕race·FuncExit(g->goid-1);
	m->racecall = false;
}

void
runtime·racemalloc(void *p, uintptr sz, void *pc)
{
	// use m->curg because runtime·stackalloc() is called from g0
	if(m->curg == nil)
		return;
	m->racecall = true;
	runtime∕race·Malloc(m->curg->goid-1, p, sz, pc);
	m->racecall = false;
}

void
runtime·racefree(void *p)
{
	m->racecall = true;
	runtime∕race·Free(p);
	m->racecall = false;
}

void
runtime·racegostart(int32 goid, void *pc)
{
	m->racecall = true;
	runtime∕race·GoStart(g->goid-1, goid-1, pc);
	m->racecall = false;
}

void
runtime·racegoend(int32 goid)
{
	m->racecall = true;
	runtime∕race·GoEnd(goid-1);
	m->racecall = false;
}

void
runtime·racewritepc(void *addr, void *pc)
{
	if(!onstack((uintptr)addr)) {
		m->racecall = true;
		runtime∕race·Write(g->goid-1, addr, pc);
		m->racecall = false;
	}
}

void
runtime·racereadpc(void *addr, void *pc)
{
	if(!onstack((uintptr)addr)) {
		m->racecall = true;
		runtime∕race·Read(g->goid-1, addr, pc);
		m->racecall = false;
	}
}

void
runtime·raceacquire(void *addr)
{
	runtime·raceacquireg(g, addr);
}

void
runtime·raceacquireg(G *gp, void *addr)
{
	if(g->raceignore)
		return;
	m->racecall = true;
	runtime∕race·Acquire(gp->goid-1, addr);
	m->racecall = false;
}

void
runtime·racerelease(void *addr)
{
	runtime·racereleaseg(g, addr);
}

void
runtime·racereleaseg(G *gp, void *addr)
{
	if(g->raceignore)
		return;
	m->racecall = true;
	runtime∕race·Release(gp->goid-1, addr);
	m->racecall = false;
}

void
runtime·racereleasemerge(void *addr)
{
	runtime·racereleasemergeg(g, addr);
}

void
runtime·racereleasemergeg(G *gp, void *addr)
{
	if(g->raceignore)
		return;
	m->racecall = true;
	runtime∕race·ReleaseMerge(gp->goid-1, addr);
	m->racecall = false;
}

void
runtime·racefingo(void)
{
	m->racecall = true;
	runtime∕race·FinalizerGoroutine(g->goid - 1);
	m->racecall = false;
}

// func RaceAcquire(addr unsafe.Pointer)
void
runtime·RaceAcquire(void *addr)
{
	runtime·raceacquire(addr);
}

// func RaceRelease(addr unsafe.Pointer)
void
runtime·RaceRelease(void *addr)
{
	runtime·racerelease(addr);
}

// func RaceReleaseMerge(addr unsafe.Pointer)
void
runtime·RaceReleaseMerge(void *addr)
{
	runtime·racereleasemerge(addr);
}

// func RaceSemacquire(s *uint32)
void runtime·RaceSemacquire(uint32 *s)
{
	runtime·semacquire(s);
}

// func RaceSemrelease(s *uint32)
void runtime·RaceSemrelease(uint32 *s)
{
	runtime·semrelease(s);
}

// func RaceDisable()
void runtime·RaceDisable(void)
{
	g->raceignore++;
}

// func RaceEnable()
void runtime·RaceEnable(void)
{
	g->raceignore--;
}

static bool
onstack(uintptr argp)
{
	// noptrdata, data, bss, noptrbss
	// the layout is in ../../cmd/ld/data.c
	if((byte*)argp >= noptrdata && (byte*)argp < enoptrbss)
		return false;
	if((byte*)argp >= runtime·mheap.arena_start && (byte*)argp < runtime·mheap.arena_used)
		return false;
	return true;
}